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dbus: add the D-Bus daemon, command-line client and tests

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Add the D-Bus API definition and its implementation in the form of a GPIO
manager daemon and a companion command-line client as well as some
additional configuration and data files (systemd service, example udev
configuration, etc.) and test suites.

Tested-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Link: https://lore.kernel.org/r/20240812-dbus-v5-4-ead288509217@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Bartosz Golaszewski
2024-08-12 10:22:25 +02:00
parent e090088c21
commit a5ab76da1e
46 changed files with 7299 additions and 17 deletions
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7
Makefile.am
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@@ -1,5 +1,6 @@
# SPDX-License-Identifier: GPL-2.0-or-later
# SPDX-FileCopyrightText: 2017-2021 Bartosz Golaszewski <bartekgola@gmail.com>
# SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
ACLOCAL_AMFLAGS = -I m4
AUTOMAKE_OPTIONS = foreign
@@ -37,6 +38,12 @@ endif
# libgpiosim to be already present.
SUBDIRS += bindings
if WITH_DBUS
SUBDIRS += dbus
endif
if HAS_DOXYGEN
doc: Doxyfile

64
README
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@@ -229,6 +229,70 @@ C library using make, they will be automatically configured to build against the
build results of the C library. Please refer to bindings/rust/libgpiod/README.md
for more information.
DBUS
----
A commonly requested feature for the GPIO character device was state persistence
after releasing the lines (as a kernel feature) or providing a central authority
(in user-space) that would be in charge of keeping the lines requested and in a
certain state (similarily to how the sysfs ABI works). DBus API has been
provided to address this requirement. We define an interface covering the
majority of the GPIO chardev's functionality and implement it from both the
server and client sides in the form of the gpio-manager daemon and the gpiocli
command-line utility for talking to the manager.
DBus support can be built by passing --enable-dbus to configure. The daemon
is bundled with a systemd unit file and an example configuration file for the
io.gpiod1 interface that allows all users to access basic information about the
GPIOs in the system but only root to request lines or change their values.
With the manager running the user can run gpiocli to control GPIOs by asking
gpio-manager to act on their behalf:
# Detect chips in the system.
$ gpiocli detect
gpiochip0 [INT34C6:00] (463 lines)
# Request a set of lines. Note that gpiocli exits immediately but the
# state of the lines is retained because it's the gpio-manager that
# requested them.
$ gpiocli request --output foo=active
request0
# Previous invocation printed out the name of the request by which the
# caller can refer to it later. All active requests can also be inspected
# at any time.
$ gpiocli requests
request0 (gpiochip1) Offsets: [5]
# We can print the information about the requested line using the
# information above.
$ gpiocli info --chip=gpiochip1 5
gpiochip1 5: "foo" [used,consumer="gpiocli request",managed="request0",output,push-pull]
# We can now change the value of the line.
$ gpiocli set foo=inactive
# And read it.
$ gpiocli get foo
"foo"=inactive
# We can even reconfigure it to input and enable edge-detection.
$ gpiocli reconfigure --input --both-edges request0
# And wait for edge events.
$ gpiocli monitor cos
21763952894920 rising "foo"
# And finally release the request.
$ gpiocli release request0
For more information please refer to the output of gpiocli --help as well as
gpiocli <command> --help which prints detailed info on every available command.
Of course - this being DBus - users can talk to gpio-manager using any DBus
library available and are not limited to the provided client.
TESTING
-------

17
TODO
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@@ -11,23 +11,6 @@ serve as the starting point.
==========
* implement dbus API for controlling GPIOs
A common complaint from users about gpioset is that the state of a line is not
retained once the program exits. While this is precisely the way linux
character devices work, it's understandable that most users will want some
centralized way of controlling GPIOs - similar to how sysfs worked.
One of the possible solutions is a DBus API. We need a daemon exposing chips
and lines as dbus objects and allowing to control and inspect lines using
dbus methods and monitor them using signals.
As of writing of this document some of the work has already been done and the
skeleton of the dbus daemon written in C using GLib has already been developed
and is partially functional.
----------
* implement a simple daemon for controlling GPIOs in C together with a client
program

45
configure.ac
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@@ -280,6 +280,45 @@ m4_ifdef([GOBJECT_INTROSPECTION_CHECK],
[GOBJECT_INTROSPECTION_CHECK([0.6.2])],
[AM_CONDITIONAL(HAVE_INTROSPECTION, test "x$found_introspection" = "xyes")])
# Depends on GLib bindings so must come after
AC_ARG_ENABLE([dbus],
[AS_HELP_STRING([--enable-dbus], [build dbus daemon [default=no]])],
[if test "x$enableval" == xyes; then with_dbus=true; fi],
[with_dbus=false])
AM_CONDITIONAL([WITH_DBUS], [test "x$with_dbus" = xtrue])
AC_DEFUN([FUNC_NOT_FOUND_DBUS],
[ERR_NOT_FOUND([$1()], [dbus daemon])])
if test "x$with_dbus" = xtrue && test "x$with_bindings_glib" != xtrue
then
AC_MSG_ERROR([GLib bindings are required to build the dbus daemon - use --enable-bindings-glib])
fi
if test "x$with_dbus" = xtrue
then
AC_CHECK_FUNC([daemon], [], [FUNC_NOT_FOUND_DBUS([daemon])])
AC_CHECK_FUNC([strverscmp], [], [FUNC_NOT_FOUND_DBUS([strverscmp])])
PKG_CHECK_MODULES([GUDEV], [gudev-1.0 >= 230])
AC_CHECK_PROG([has_gdbus_codegen], [gdbus-codegen], [true], [false])
if test "x$has_gdbus_codegen" = xfalse
then
AC_MSG_ERROR([gdbus-codegen not found - needed to build dbus daemon])
fi
fi
AC_ARG_ENABLE([systemd],
[AS_HELP_STRING([--enable-systemd], [enable systemd support [default=no]])],
[if test "x$enableval" == xyes; then with_systemd=true; fi],
[with_systemd=false])
AM_CONDITIONAL([WITH_SYSTEMD], [test "x$with_systemd" = xtrue])
if test "x$with_systemd" = xtrue
then
PKG_CHECK_VAR([systemdsystemunitdir], [systemd], [systemdsystemunitdir], [],
AC_MSG_ERROR([systemdsystemunitdir not found - needed to enable systemd support]))
fi
AC_CHECK_PROG([has_doxygen], [doxygen], [true], [false])
AM_CONDITIONAL([HAS_DOXYGEN], [test "x$has_doxygen" = xtrue])
if test "x$has_doxygen" = xfalse
@@ -337,6 +376,12 @@ AC_CONFIG_FILES([Makefile
bindings/rust/Makefile
bindings/rust/gpiosim-sys/src/Makefile
bindings/rust/gpiosim-sys/Makefile
dbus/Makefile
dbus/client/Makefile
dbus/data/Makefile
dbus/lib/Makefile
dbus/manager/Makefile
dbus/tests/Makefile
man/Makefile])
AC_OUTPUT

10
dbus/Makefile.am Normal file
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@@ -0,0 +1,10 @@
# SPDX-License-Identifier: GPL-2.0-or-later
# SPDX-FileCopyrightText: 2022-2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
SUBDIRS = data lib manager client
if WITH_TESTS
SUBDIRS += tests
endif

4
dbus/client/.gitignore vendored Normal file
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@@ -0,0 +1,4 @@
# SPDX-License-Identifier: CC0-1.0
# SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
gpiocli

31
dbus/client/Makefile.am Normal file
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@@ -0,0 +1,31 @@
# SPDX-License-Identifier: GPL-2.0-or-later
# SPDX-FileCopyrightText: 2022-2024 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
AM_CFLAGS = -include $(top_builddir)/config.h
AM_CFLAGS += -I$(top_builddir)/dbus/lib/ -I$(top_srcdir)/dbus/lib/
AM_CFLAGS += -Wall -Wextra -g
AM_CFLAGS += $(GLIB_CFLAGS) $(GIO_CFLAGS) $(GIO_UNIX_CFLAGS)
AM_CFLAGS += -DG_LOG_DOMAIN=\"gpiocli\"
AM_LDFLAGS = $(GLIB_LIBS) $(GIO_LIBS) $(GIO_UNIX_LIBS)
LDADD = $(top_builddir)/dbus/lib/libgpiodbus.la
bin_PROGRAMS = gpiocli
gpiocli_SOURCES = \
common.c \
common.h \
detect.c \
find.c \
get.c \
gpiocli.c \
info.c \
monitor.c \
notify.c \
reconfigure.c \
release.c \
request.c \
requests.c \
set.c \
wait.c
noinst_SCRIPTS = gpiocli-test.bash

646
dbus/client/common.c Normal file
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@@ -0,0 +1,646 @@
// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2022-2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <glib/gprintf.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "common.h"
static void print_err_msg(GError *err, const gchar *fmt, va_list va)
{
g_printerr("%s: ", g_get_prgname());
g_vfprintf(stderr, fmt, va);
if (err)
g_printerr(": %s", err->message);
g_printerr("\n");
}
void die(const gchar *fmt, ...)
{
va_list va;
va_start(va, fmt);
print_err_msg(NULL, fmt, va);
va_end(va);
exit(EXIT_FAILURE);
}
void die_gerror(GError *err, const gchar *fmt, ...)
{
va_list va;
va_start(va, fmt);
print_err_msg(err, fmt, va);
va_end(va);
exit(EXIT_FAILURE);
}
void die_parsing_opts(const char *fmt, ...)
{
va_list va;
va_start(va, fmt);
print_err_msg(NULL, fmt, va);
va_end(va);
g_printerr("\nSee %s --help\n", g_get_prgname());
exit(EXIT_FAILURE);
}
void parse_options(const GOptionEntry *opts, const gchar *summary,
const gchar *description, int *argc, char ***argv)
{
g_autoptr(GOptionContext) ctx = NULL;
g_autoptr(GError) err = NULL;
gboolean ret;
ctx = g_option_context_new(NULL);
g_option_context_set_summary(ctx, summary);
g_option_context_set_description(ctx, description);
g_option_context_add_main_entries(ctx, opts, NULL);
g_option_context_set_strict_posix(ctx, TRUE);
ret = g_option_context_parse(ctx, argc, argv, &err);
if (!ret) {
g_printerr("%s: Option parsing failed: %s\nSee %s --help\n",
g_get_prgname(), err->message, g_get_prgname());
exit(EXIT_FAILURE);
}
}
void check_manager(void)
{
g_autoptr(GDBusProxy) proxy = NULL;
g_autoptr(GVariant) result = NULL;
g_autoptr(GError) err = NULL;
proxy = g_dbus_proxy_new_for_bus_sync(
G_BUS_TYPE_SYSTEM, G_DBUS_PROXY_FLAGS_NONE, NULL,
"io.gpiod1", "/io/gpiod1", "org.freedesktop.DBus.Peer",
NULL, &err);
if (!proxy)
die_gerror(err, "Unable to create a proxy to '/io/gpiod1'");
result = g_dbus_proxy_call_sync(proxy, "Ping", NULL,
G_DBUS_CALL_FLAGS_NONE, -1, NULL,
&err);
if (!result) {
if (err->domain == G_DBUS_ERROR) {
switch (err->code) {
case G_DBUS_ERROR_ACCESS_DENIED:
die("Access to gpio-manager denied, check your permissions");
case G_DBUS_ERROR_SERVICE_UNKNOWN:
die("gpio-manager not running");
}
}
die_gerror(err, "Failed trying to contect the gpio manager");
}
}
gboolean quit_main_loop_on_signal(gpointer user_data)
{
GMainLoop *loop = user_data;
g_main_loop_quit(loop);
return G_SOURCE_REMOVE;
}
void die_on_name_vanished(GDBusConnection *con G_GNUC_UNUSED,
const gchar *name G_GNUC_UNUSED,
gpointer user_data G_GNUC_UNUSED)
{
die("gpio-manager exited unexpectedly");
}
GList *strv_to_gstring_list(GStrv lines)
{
gsize llen = g_strv_length(lines);
GList *list = NULL;
guint i;
for (i = 0; i < llen; i++)
list = g_list_append(list, g_string_new(lines[i]));
return list;
}
gint output_value_from_str(const gchar *value_str)
{
if ((g_strcmp0(value_str, "active") == 0) ||
(g_strcmp0(value_str, "1") == 0))
return 1;
else if ((g_strcmp0(value_str, "inactive") == 0) ||
(g_strcmp0(value_str, "0") == 0))
return 0;
die_parsing_opts("invalid output value: '%s'", value_str);
}
static gboolean str_is_all_digits(const gchar *str)
{
for (; *str; str++) {
if (!g_ascii_isdigit(*str))
return FALSE;
}
return TRUE;
}
static gint compare_objs_by_path(GDBusObject *a, GDBusObject *b)
{
return strverscmp(g_dbus_object_get_object_path(a),
g_dbus_object_get_object_path(b));
}
GDBusObjectManager *get_object_manager_client(const gchar *obj_path)
{
g_autoptr(GDBusObjectManager) manager = NULL;
g_autoptr(GError) err = NULL;
manager = gpiodbus_object_manager_client_new_for_bus_sync(
G_BUS_TYPE_SYSTEM,
G_DBUS_OBJECT_MANAGER_CLIENT_FLAGS_NONE,
"io.gpiod1", obj_path, NULL, &err);
if (!manager)
die_gerror(err,
"failed to create the object manager client for %s",
obj_path);
return g_object_ref(manager);
}
static gchar *make_chip_obj_path(const gchar *chip)
{
return g_strdup_printf(
str_is_all_digits(chip) ?
"/io/gpiod1/chips/gpiochip%s" :
"/io/gpiod1/chips/%s",
chip);
}
GpiodbusObject *get_chip_obj_by_path(const gchar *obj_path)
{
g_autoptr(GDBusObjectManager) manager = NULL;
g_autoptr(GpiodbusObject) chip_obj = NULL;
manager = get_object_manager_client("/io/gpiod1/chips");
chip_obj = GPIODBUS_OBJECT(g_dbus_object_manager_get_object(manager,
obj_path));
if (!chip_obj)
die("No such chip object: '%s'", obj_path);
return g_object_ref(chip_obj);
}
GpiodbusObject *get_chip_obj(const gchar *chip_name)
{
g_autofree gchar *chip_path = make_chip_obj_path(chip_name);
return get_chip_obj_by_path(chip_path);
}
GList *get_chip_objs(GStrv chip_names)
{
g_autoptr(GDBusObjectManager) manager = NULL;
GList *objs = NULL;
gint i;
manager = get_object_manager_client("/io/gpiod1/chips");
if (!chip_names)
return g_list_sort(g_dbus_object_manager_get_objects(manager),
(GCompareFunc)compare_objs_by_path);
for (i = 0; chip_names[i]; i++) {
g_autofree gchar *obj_path = make_chip_obj_path(chip_names[i]);
g_autoptr(GpiodbusObject) obj = NULL;
obj = GPIODBUS_OBJECT(
g_dbus_object_manager_get_object(manager, obj_path));
if (!obj)
die("No such chip: '%s'", chip_names[i]);
objs = g_list_insert_sorted(objs, g_object_ref(obj),
(GCompareFunc)compare_objs_by_path);
}
return objs;
}
gchar *make_request_obj_path(const gchar *request)
{
return g_strdup_printf(
str_is_all_digits(request) ?
"/io/gpiod1/requests/request%s" :
"/io/gpiod1/requests/%s",
request);
}
GpiodbusObject *get_request_obj(const gchar *request_name)
{
g_autoptr(GDBusObjectManager) manager = NULL;
g_autoptr(GpiodbusObject) req_obj = NULL;
g_autofree gchar *obj_path = NULL;
manager = get_object_manager_client("/io/gpiod1/requests");
obj_path = make_request_obj_path(request_name);
req_obj = GPIODBUS_OBJECT(g_dbus_object_manager_get_object(manager,
obj_path));
if (!req_obj)
die("No such request: '%s'", request_name);
return g_object_ref(req_obj);
}
GList *get_request_objs(void)
{
g_autoptr(GDBusObjectManager) manager = NULL;
GList *objs = NULL;
manager = get_object_manager_client("/io/gpiod1/requests");
objs = g_dbus_object_manager_get_objects(manager);
return g_list_sort(objs, (GCompareFunc)compare_objs_by_path);
}
GArray *get_request_offsets(GpiodbusRequest *request)
{
const gchar *chip_path, *line_path, *const *line_paths;
g_autoptr(GDBusObjectManager) manager = NULL;
g_autoptr(GArray) offsets = NULL;
GpiodbusLine *line;
guint i, offset;
chip_path = gpiodbus_request_get_chip_path(request);
line_paths = gpiodbus_request_get_line_paths(request);
offsets = g_array_new(FALSE, TRUE, sizeof(guint));
manager = get_object_manager_client(chip_path);
for (i = 0, line_path = line_paths[i];
line_path;
line_path = line_paths[++i]) {
g_autoptr(GDBusObject) line_obj = NULL;
line_obj = g_dbus_object_manager_get_object(manager, line_path);
line = gpiodbus_object_peek_line(GPIODBUS_OBJECT(line_obj));
offset = gpiodbus_line_get_offset(line);
g_array_append_val(offsets, offset);
}
return g_array_ref(offsets);
}
gboolean get_line_obj_by_name(const gchar *name, GpiodbusObject **line_obj,
GpiodbusObject **chip_obj)
{
g_autolist(GpiodbusObject) chip_objs = NULL;
GList *pos;
if (str_is_all_digits(name))
die("Refusing to use line offsets if chip is not specified");
chip_objs = get_chip_objs(NULL);
for (pos = g_list_first(chip_objs); pos; pos = g_list_next(pos)) {
*line_obj = get_line_obj_by_name_for_chip(pos->data, name);
if (*line_obj) {
if (chip_obj)
*chip_obj = g_object_ref(pos->data);
return TRUE;
}
}
return FALSE;
}
GpiodbusObject *
get_line_obj_by_name_for_chip(GpiodbusObject *chip_obj, const gchar *line_name)
{
g_autoptr(GDBusObjectManager) manager = NULL;
g_autolist(GpiodbusObject) line_objs = NULL;
const gchar *chip_path;
GpiodbusLine *line;
guint64 offset;
GList *pos;
chip_path = g_dbus_object_get_object_path(G_DBUS_OBJECT(chip_obj));
manager = get_object_manager_client(chip_path);
line_objs = g_dbus_object_manager_get_objects(manager);
for (pos = g_list_first(line_objs); pos; pos = g_list_next(pos)) {
line = gpiodbus_object_peek_line(pos->data);
if (g_strcmp0(gpiodbus_line_get_name(line), line_name) == 0)
return g_object_ref(pos->data);
if (str_is_all_digits(line_name)) {
offset = g_ascii_strtoull(line_name, NULL, 10);
if (offset == gpiodbus_line_get_offset(line))
return g_object_ref(pos->data);
}
}
return NULL;
}
GList *get_all_line_objs_for_chip(GpiodbusObject *chip_obj)
{
g_autoptr(GDBusObjectManager) manager = NULL;
const gchar *chip_path;
chip_path = g_dbus_object_get_object_path(G_DBUS_OBJECT(chip_obj));
manager = get_object_manager_client(chip_path);
return g_list_sort(g_dbus_object_manager_get_objects(manager),
(GCompareFunc)compare_objs_by_path);
}
static gchar *sanitize_str(const gchar *str)
{
if (!strlen(str))
return NULL;
return g_strdup(str);
}
static const gchar *sanitize_direction(const gchar *direction)
{
if ((g_strcmp0(direction, "input") == 0) ||
(g_strcmp0(direction, "output") == 0))
return direction;
die("invalid direction value received from manager: '%s'", direction);
}
static const gchar *sanitize_drive(const gchar *drive)
{
if ((g_strcmp0(drive, "push-pull") == 0) ||
(g_strcmp0(drive, "open-source") == 0) ||
(g_strcmp0(drive, "open-drain") == 0))
return drive;
die("invalid drive value received from manager: '%s'", drive);
}
static const gchar *sanitize_bias(const gchar *bias)
{
if ((g_strcmp0(bias, "pull-up") == 0) ||
(g_strcmp0(bias, "pull-down") == 0) ||
(g_strcmp0(bias, "disabled") == 0))
return bias;
if (g_strcmp0(bias, "unknown") == 0)
return NULL;
die("invalid bias value received from manager: '%s'", bias);
}
static const gchar *sanitize_edge(const gchar *edge)
{
if ((g_strcmp0(edge, "rising") == 0) ||
(g_strcmp0(edge, "falling") == 0) ||
(g_strcmp0(edge, "both") == 0))
return edge;
if (g_strcmp0(edge, "none") == 0)
return NULL;
die("invalid edge value received from manager: '%s'", edge);
}
static const gchar *sanitize_clock(const gchar *event_clock)
{
if ((g_strcmp0(event_clock, "monotonic") == 0) ||
(g_strcmp0(event_clock, "realtime") == 0) ||
(g_strcmp0(event_clock, "hte") == 0))
return event_clock;
die("invalid clock value received from manager: '%s'", event_clock);
}
gchar *sanitize_object_path(const gchar *path)
{
if (g_strcmp0(path, "/") == 0)
return g_strdup("N/A");
return g_path_get_basename(path);
}
LineProperties *get_line_properties(GpiodbusLine *line)
{
LineProperties *props;
props = g_malloc0(sizeof(*props));
props->name = sanitize_str(gpiodbus_line_get_name(line));
props->offset = gpiodbus_line_get_offset(line);
props->used = gpiodbus_line_get_used(line);
props->consumer = sanitize_str(gpiodbus_line_get_consumer(line));
props->direction = sanitize_direction(
gpiodbus_line_get_direction(line));
props->drive = sanitize_drive(gpiodbus_line_get_drive(line));
props->bias = sanitize_bias(gpiodbus_line_get_bias(line));
props->active_low = gpiodbus_line_get_active_low(line);
props->edge = sanitize_edge(gpiodbus_line_get_edge_detection(line));
props->debounced = gpiodbus_line_get_debounced(line);
props->debounce_period = gpiodbus_line_get_debounce_period_us(line);
props->event_clock = sanitize_clock(
gpiodbus_line_get_event_clock(line));
props->managed = gpiodbus_line_get_managed(line);
props->request_name = sanitize_object_path(
gpiodbus_line_get_request_path(line));
return props;
}
void free_line_properties(LineProperties *props)
{
g_free(props->name);
g_free(props->consumer);
g_free(props->request_name);
g_free(props);
}
void validate_line_config_opts(LineConfigOpts *opts)
{
gint counter;
if (opts->input && opts->output)
die_parsing_opts("--input and --output are mutually exclusive");
if (opts->both_edges)
opts->rising_edge = opts->falling_edge = TRUE;
if (!opts->input && (opts->rising_edge || opts->falling_edge))
die_parsing_opts("monitoring edges is only possible in input mode");
counter = 0;
if (opts->push_pull)
counter++;
if (opts->open_drain)
counter++;
if (opts->open_source)
counter++;
if (counter > 1)
die_parsing_opts("--push-pull, --open-drain and --open-source are mutually exclusive");
if (!opts->output && (counter > 0))
die_parsing_opts("--push-pull, --open-drain and --open-source are only available in output mode");
counter = 0;
if (opts->pull_up)
counter++;
if (opts->pull_down)
counter++;
if (opts->bias_disabled)
counter++;
if (counter > 1)
die_parsing_opts("--pull-up, --pull-down and --bias-disabled are mutually exclusive");
counter = 0;
if (opts->clock_monotonic)
counter++;
if (opts->clock_realtime)
counter++;
if (opts->clock_hte)
counter++;
if (counter > 1)
die_parsing_opts("--clock-monotonic, --clock-realtime and --clock-hte are mutually exclusive");
if (counter > 0 && (!opts->rising_edge && !opts->falling_edge))
die_parsing_opts("--clock-monotonic, --clock-realtime and --clock-hte can only be used with edge detection enabled");
if (opts->debounce_period && (!opts->rising_edge && !opts->falling_edge))
die_parsing_opts("--debounce-period can only be used with edge-detection enabled");
}
GVariant *make_line_config(GArray *offsets, LineConfigOpts *opts)
{
const char *direction, *edge = NULL, *bias = NULL, *drive = NULL,
*clock = NULL;
g_autoptr(GVariant) output_values = NULL;
g_autoptr(GVariant) line_settings = NULL;
g_autoptr(GVariant) line_offsets = NULL;
g_autoptr(GVariant) line_configs = NULL;
g_autoptr(GVariant) line_config = NULL;
GVariantBuilder builder;
guint i;
g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
for (i = 0; i < offsets->len; i++)
g_variant_builder_add_value(&builder,
g_variant_new_uint32(g_array_index(offsets, guint, i)));
line_offsets = g_variant_builder_end(&builder);
g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
if (opts->input)
direction = "input";
else if (opts->output)
direction = "output";
else
direction = "as-is";
if (direction)
g_variant_builder_add_value(&builder,
g_variant_new("{sv}", "direction",
g_variant_new_string(direction)));
if (opts->rising_edge && opts->falling_edge)
edge = "both";
else if (opts->falling_edge)
edge = "falling";
else if (opts->rising_edge)
edge = "rising";
if (edge)
g_variant_builder_add_value(&builder,
g_variant_new("{sv}", "edge",
g_variant_new_string(edge)));
if (opts->pull_up)
bias = "pull-up";
else if (opts->pull_down)
bias = "pull-down";
else if (opts->bias_disabled)
bias = "disabled";
if (bias)
g_variant_builder_add_value(&builder,
g_variant_new("{sv}", "bias",
g_variant_new_string(bias)));
if (opts->push_pull)
drive = "push-pull";
else if (opts->open_drain)
drive = "open-drain";
else if (opts->open_source)
drive = "open-source";
if (drive)
g_variant_builder_add_value(&builder,
g_variant_new("{sv}", "drive",
g_variant_new_string(drive)));
if (opts->active_low)
g_variant_builder_add_value(&builder,
g_variant_new("{sv}", "active-low",
g_variant_new_boolean(TRUE)));
if (opts->debounce_period)
g_variant_builder_add_value(&builder,
g_variant_new("{sv}", "debounce-period",
g_variant_new_int64(opts->debounce_period)));
if (opts->clock_monotonic)
clock = "monotonic";
else if (opts->clock_realtime)
clock = "realtime";
else if (opts->clock_hte)
clock = "hte";
if (clock)
g_variant_builder_add_value(&builder,
g_variant_new("{sv}", "event-clock",
g_variant_new_string(clock)));
line_settings = g_variant_builder_end(&builder);
g_variant_builder_init(&builder, G_VARIANT_TYPE_TUPLE);
g_variant_builder_add_value(&builder, g_variant_ref(line_offsets));
g_variant_builder_add_value(&builder, g_variant_ref(line_settings));
line_config = g_variant_builder_end(&builder);
g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
g_variant_builder_add_value(&builder, g_variant_ref(line_config));
line_configs = g_variant_builder_end(&builder);
if (opts->output_values) {
g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
for (i = 0; i < opts->output_values->len; i++) {
g_variant_builder_add(&builder, "i",
g_array_index(opts->output_values,
gint, i));
}
output_values = g_variant_builder_end(&builder);
} else {
output_values = g_variant_new("ai", opts->output_values);
}
g_variant_builder_init(&builder, G_VARIANT_TYPE_TUPLE);
g_variant_builder_add_value(&builder, g_variant_ref(line_configs));
g_variant_builder_add_value(&builder, g_variant_ref(output_values));
return g_variant_ref_sink(g_variant_builder_end(&builder));
}

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* SPDX-FileCopyrightText: 2022-2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org> */
#ifndef __GPIOCLI_COMMON_H__
#define __GPIOCLI_COMMON_H__
#include <gio/gio.h>
#include <glib.h>
#include <gpiodbus.h>
void die(const gchar *fmt, ...) G_NORETURN G_GNUC_PRINTF(1, 2);
void
die_gerror(GError *err, const gchar *fmt, ...) G_NORETURN G_GNUC_PRINTF(2, 3);
void die_parsing_opts(const char *fmt, ...) G_NORETURN G_GNUC_PRINTF(1, 2);
void parse_options(const GOptionEntry *opts, const gchar *summary,
const gchar *description, int *argc, char ***argv);
void check_manager(void);
gboolean quit_main_loop_on_signal(gpointer user_data);
void die_on_name_vanished(GDBusConnection *con, const gchar *name,
gpointer user_data);
GList *strv_to_gstring_list(GStrv lines);
gint output_value_from_str(const gchar *value_str);
GDBusObjectManager *get_object_manager_client(const gchar *obj_path);
GpiodbusObject *get_chip_obj_by_path(const gchar *obj_path);
GpiodbusObject *get_chip_obj(const gchar *chip_name);
GList *get_chip_objs(GStrv chip_names);
gchar *make_request_obj_path(const gchar *request);
GpiodbusObject *get_request_obj(const gchar *request_name);
GList *get_request_objs(void);
GArray *get_request_offsets(GpiodbusRequest *request);
gboolean get_line_obj_by_name(const gchar *name, GpiodbusObject **line_obj,
GpiodbusObject **chip_obj);
GpiodbusObject *
get_line_obj_by_name_for_chip(GpiodbusObject *chip_obj, const gchar *name_line);
GList *get_all_line_objs_for_chip(GpiodbusObject *chip_obj);
gchar *sanitize_object_path(const gchar *path);
typedef struct {
gchar *name;
guint offset;
gboolean used;
gchar *consumer;
const gchar *direction;
const gchar *drive;
const gchar *bias;
gboolean active_low;
const gchar *edge;
gboolean debounced;
guint64 debounce_period;
const gchar *event_clock;
gboolean managed;
gchar *request_name;
} LineProperties;
LineProperties *get_line_properties(GpiodbusLine *line);
void free_line_properties(LineProperties *props);
G_DEFINE_AUTOPTR_CLEANUP_FUNC(LineProperties, free_line_properties);
typedef struct {
gboolean input;
gboolean output;
gboolean active_low;
gboolean rising_edge;
gboolean falling_edge;
gboolean both_edges;
gboolean push_pull;
gboolean open_source;
gboolean open_drain;
gboolean pull_up;
gboolean pull_down;
gboolean bias_disabled;
gboolean clock_monotonic;
gboolean clock_realtime;
gboolean clock_hte;
GTimeSpan debounce_period;
GArray *output_values;
} LineConfigOpts;
#define LINE_CONFIG_OPTIONS(opts) \
{ \
.long_name = "input", \
.flags = G_OPTION_FLAG_NONE, \
.arg = G_OPTION_ARG_NONE, \
.arg_data = &(opts)->input, \
.description = "Set direction to input.", \
}, \
{ \
.long_name = "output", \
.flags = G_OPTION_FLAG_NONE, \
.arg = G_OPTION_ARG_NONE, \
.arg_data = &(opts)->output, \
.description = "Set direction to output.", \
}, \
{ \
.long_name = "rising-edge", \
.flags = G_OPTION_FLAG_NONE, \
.arg = G_OPTION_ARG_NONE, \
.arg_data = &(opts)->rising_edge, \
.description = "Monitor rising edges." \
}, \
{ \
.long_name = "falling-edge", \
.flags = G_OPTION_FLAG_NONE, \
.arg = G_OPTION_ARG_NONE, \
.arg_data = &(opts)->falling_edge, \
.description = "Monitor falling edges." \
}, \
{ \
.long_name = "both-edges", \
.flags = G_OPTION_FLAG_NONE, \
.arg = G_OPTION_ARG_NONE, \
.arg_data = &(opts)->both_edges, \
.description = "Monitor rising and falling edges." \
}, \
{ \
.long_name = "push-pull", \
.flags = G_OPTION_FLAG_NONE, \
.arg = G_OPTION_ARG_NONE, \
.arg_data = &(opts)->push_pull, \
.description = "Drive the line in push-pull mode.", \
}, \
{ \
.long_name = "open-drain", \
.flags = G_OPTION_FLAG_NONE, \
.arg = G_OPTION_ARG_NONE, \
.arg_data = &(opts)->open_drain, \
.description = "Drive the line in open-drain mode.", \
}, \
{ \
.long_name = "open-source", \
.flags = G_OPTION_FLAG_NONE, \
.arg = G_OPTION_ARG_NONE, \
.arg_data = &(opts)->open_source, \
.description = "Drive the line in open-source mode.", \
}, \
{ \
.long_name = "pull-up", \
.flags = G_OPTION_FLAG_NONE, \
.arg = G_OPTION_ARG_NONE, \
.arg_data = &(opts)->pull_up, \
.description = "Enable internal pull-up bias.", \
}, \
{ \
.long_name = "pull-down", \
.flags = G_OPTION_FLAG_NONE, \
.arg = G_OPTION_ARG_NONE, \
.arg_data = &(opts)->pull_down, \
.description = "Enable internal pull-down bias.", \
}, \
{ \
.long_name = "bias-disabled", \
.flags = G_OPTION_FLAG_NONE, \
.arg = G_OPTION_ARG_NONE, \
.arg_data = &(opts)->bias_disabled, \
.description = "Disable internal pull-up/down bias.", \
}, \
{ \
.long_name = "active-low", \
.flags = G_OPTION_FLAG_NONE, \
.arg = G_OPTION_ARG_NONE, \
.arg_data = &(opts)->active_low, \
.description = "Treat the lines as active low.", \
}, \
{ \
.long_name = "debounce-period", \
.flags = G_OPTION_FLAG_NONE, \
.arg = G_OPTION_ARG_INT64, \
.arg_data = &(opts)->debounce_period, \
.arg_description = "<period in miliseconds>", \
.description = "Enable debouncing and set the period", \
}, \
{ \
.long_name = "clock-monotonic", \
.flags = G_OPTION_FLAG_NONE, \
.arg = G_OPTION_ARG_NONE, \
.arg_data = &(opts)->clock_monotonic, \
.description = "Use monotonic clock for edge event timestamps", \
}, \
{ \
.long_name = "clock-realtime", \
.flags = G_OPTION_FLAG_NONE, \
.arg = G_OPTION_ARG_NONE, \
.arg_data = &(opts)->clock_realtime, \
.description = "Use realtime clock for edge event timestamps", \
}, \
{ \
.long_name = "clock-hte", \
.flags = G_OPTION_FLAG_NONE, \
.arg = G_OPTION_ARG_NONE, \
.arg_data = &(opts)->clock_hte, \
.description = "Use HTE clock (if available) for edge event timestamps", \
}
void validate_line_config_opts(LineConfigOpts *opts);
GVariant *make_line_config(GArray *offsets, LineConfigOpts *cfg_opts);
#endif /* __GPIOCLI_COMMON_H__ */

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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2022-2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <stdlib.h>
#include "common.h"
static void show_chip(gpointer elem, gpointer user_data G_GNUC_UNUSED)
{
GpiodbusObject *chip_obj = elem;
GpiodbusChip *chip;
chip = gpiodbus_object_peek_chip(chip_obj);
g_print("%s [%s] (%u lines)\n",
gpiodbus_chip_get_name(chip),
gpiodbus_chip_get_label(chip),
gpiodbus_chip_get_num_lines(chip));
}
int gpiocli_detect_main(int argc, char **argv)
{
static const gchar *const summary =
"List GPIO chips, print their labels and number of GPIO lines.";
static const gchar *const description =
"Chips may be identified by name or number. e.g. '0' and 'gpiochip0' refer to\n"
"the same chip.\n"
"\n"
"If no chips are specified - display information for all chips in the system.";
g_autolist(GpiodbusObject) chip_objs = NULL;
g_auto(GStrv) chip_names = NULL;
const GOptionEntry opts[] = {
{
.long_name = G_OPTION_REMAINING,
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING_ARRAY,
.arg_data = &chip_names,
.arg_description = "[chip]...",
},
{ }
};
parse_options(opts, summary, description, &argc, &argv);
check_manager();
chip_objs = get_chip_objs(chip_names);
g_list_foreach(chip_objs, show_chip, NULL);
return EXIT_SUCCESS;
}

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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <stdlib.h>
#include "common.h"
static void find_line_in_chip(gpointer elem, gpointer user_data)
{
g_autoptr(GpiodbusObject) line_obj = NULL;
GpiodbusObject *chip_obj = elem;
const gchar *name = user_data;
GpiodbusChip *chip;
GpiodbusLine *line;
line_obj = get_line_obj_by_name_for_chip(chip_obj, name);
if (!line_obj)
return;
chip = gpiodbus_object_peek_chip(chip_obj);
line = gpiodbus_object_peek_line(line_obj);
g_print("%s %u\n",
gpiodbus_chip_get_name(chip),
gpiodbus_line_get_offset(line));
exit(EXIT_SUCCESS);
}
int gpiocli_find_main(int argc, char **argv)
{
static const gchar *const summary =
"Gicen a line name, find the name of the parent chip and offset of the line within that chip.";
static const gchar *const description =
"As line names are not guaranteed to be unique, this command finds the first line with given name.";
g_autolist(GpiodbusObject) objs = NULL;
g_auto(GStrv) line_name = NULL;
const GOptionEntry opts[] = {
{
.long_name = G_OPTION_REMAINING,
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING_ARRAY,
.arg_data = &line_name,
.arg_description = "<line name>",
},
{ }
};
parse_options(opts, summary, description, &argc, &argv);
check_manager();
if (!line_name)
die_parsing_opts("line name must be specified");
if (g_strv_length(line_name) != 1)
die_parsing_opts("only one line can be mapped");
objs = get_chip_objs(NULL);
g_list_foreach(objs, find_line_in_chip, line_name[0]);
/* If we got here, the line was not found. */
die("line '%s' not found", line_name[0]);
return EXIT_FAILURE;
}

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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2022-2024 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <stdlib.h>
#include "common.h"
int gpiocli_get_main(int argc, char **argv)
{
static const gchar *const summary =
"Get values of one or more GPIO lines.";
static const gchar *const description =
"If -r/--request is specified then all the lines must belong to the same\n"
"request (and - by extension - the same chip).\n"
"\n"
"If no lines are specified but -r/--request was passed then all lines within\n"
"the request will be used.";
const gchar *request_name = NULL, *chip_path, *req_path;
gboolean ret, unquoted = FALSE, numeric = FALSE;
g_autoptr(GpiodbusObject) chip_obj = NULL;
g_autoptr(GpiodbusObject) req_obj = NULL;
g_autoptr(GArray) offsets = NULL;
g_autoptr(GArray) values = NULL;
g_autoptr(GError) err = NULL;
g_auto(GStrv) lines = NULL;
GpiodbusRequest *request;
GVariantBuilder builder;
GpiodbusLine *line;
gsize num_lines, i;
GVariantIter iter;
guint offset;
gint value;
const GOptionEntry opts[] = {
{
.long_name = "request",
.short_name = 'r',
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING,
.arg_data = &request_name,
.description = "restrict scope to a particular request",
.arg_description = "<request>",
},
{
.long_name = "unquoted",
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_NONE,
.arg_data = &unquoted,
.description = "don't quote line names",
},
{
.long_name = "numeric",
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_NONE,
.arg_data = &numeric,
.description = "display line values as '0' (inactive) or '1' (active)",
},
{
.long_name = G_OPTION_REMAINING,
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING_ARRAY,
.arg_data = &lines,
.arg_description = "[line0] [line1]...",
},
{ }
};
parse_options(opts, summary, description, &argc, &argv);
check_manager();
if (!lines && !request_name)
die_parsing_opts("either at least one line or the request must be specified");
offsets = g_array_new(FALSE, TRUE, sizeof(guint));
num_lines = lines ? g_strv_length(lines) : 0;
if (!request_name) {
/*
* TODO Limit the number of D-Bus calls by gathering the requests
* and their relevant lines into a container of some kind first.
*/
values = g_array_sized_new(FALSE, TRUE, sizeof(gint),
num_lines);
for (i = 0; i < num_lines; i++) {
g_autoptr(GpiodbusRequest) req_proxy = NULL;
g_autoptr(GpiodbusObject) line_obj = NULL;
g_autoptr(GVariant) arg_offsets = NULL;
g_autoptr(GVariant) arg_values = NULL;
ret = get_line_obj_by_name(lines[i], &line_obj, NULL);
if (!ret)
die("Line not found: %s\n", lines[i]);
line = gpiodbus_object_peek_line(line_obj);
req_path = gpiodbus_line_get_request_path(line);
if (!gpiodbus_line_get_managed(line))
die("Line '%s' not managed by gpio-manager, must be requested first",
lines[i]);
req_proxy = gpiodbus_request_proxy_new_for_bus_sync(
G_BUS_TYPE_SYSTEM,
G_DBUS_PROXY_FLAGS_NONE,
"io.gpiod1", req_path,
NULL, &err);
if (err)
die_gerror(err,
"Failed to get D-Bus proxy for '%s'",
req_path);
offset = gpiodbus_line_get_offset(line);
g_array_append_val(offsets, offset);
g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
g_variant_builder_add(&builder, "u", offset);
arg_offsets = g_variant_ref_sink(
g_variant_builder_end(&builder));
ret = gpiodbus_request_call_get_values_sync(
req_proxy, arg_offsets,
G_DBUS_CALL_FLAGS_NONE,
-1, &arg_values, NULL,
&err);
if (!ret)
die_gerror(err, "Failed to get line values");
g_variant_iter_init(&iter, arg_values);
while (g_variant_iter_next(&iter, "i", &value))
g_array_append_val(values, value);
}
} else {
g_autoptr(GVariant) arg_offsets = NULL;
g_autoptr(GVariant) arg_values = NULL;
req_obj = get_request_obj(request_name);
request = gpiodbus_object_peek_request(req_obj);
chip_path = gpiodbus_request_get_chip_path(request);
chip_obj = get_chip_obj_by_path(chip_path);
if (lines) {
for (i = 0; i < num_lines; i++) {
g_autoptr(GpiodbusObject) line_obj = NULL;
line_obj = get_line_obj_by_name_for_chip(
chip_obj, lines[i]);
if (!line_obj)
die("Line not found: %s\n", lines[i]);
line = gpiodbus_object_peek_line(line_obj);
if (!gpiodbus_line_get_managed(line))
die("Line '%s' not managed by gpio-manager, must be requested first",
lines[i]);
offset = gpiodbus_line_get_offset(line);
g_array_append_val(offsets, offset);
}
} else {
offsets = get_request_offsets(request);
num_lines = offsets->len;
}
g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
for (i = 0; i < offsets->len; i++)
g_variant_builder_add(&builder, "u",
g_array_index(offsets, guint, i));
arg_offsets = g_variant_ref_sink(
g_variant_builder_end(&builder));
ret = gpiodbus_request_call_get_values_sync(
request, arg_offsets,
G_DBUS_CALL_FLAGS_NONE,
-1, &arg_values, NULL,
&err);
if (!ret)
die_gerror(err, "Failed to get line values");
values = g_array_sized_new(FALSE, TRUE, sizeof(gint),
g_variant_n_children(arg_values));
g_variant_iter_init(&iter, arg_values);
while (g_variant_iter_next(&iter, "i", &value))
g_array_append_val(values, value);
}
for (i = 0; i < num_lines; i++) {
if (!unquoted)
g_print("\"");
if (lines)
g_print("%s", lines[i]);
else
g_print("%u", g_array_index(offsets, guint, i));
if (!unquoted)
g_print("\"");
g_print("=%s", g_array_index(values, guint, i) ?
numeric ? "1" : "active" :
numeric ? "0" : "inactive");
if (i != (num_lines - 1))
g_print(" ");
}
g_print("\n");
return EXIT_SUCCESS;
}

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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2022-2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <glib/gstdio.h>
#include "common.h"
typedef struct {
gchar *name;
int (*main_func)(int argc, char **argv);
gchar *descr;
} GPIOCliCmd;
int gpiocli_detect_main(int argc, char **argv);
int gpiocli_find_main(int argc, char **argv);
int gpiocli_info_main(int argc, char **argv);
int gpiocli_get_main(int argc, char **argv);
int gpiocli_monitor_main(int argc, char **argv);
int gpiocli_notify_main(int argc, char **argv);
int gpiocli_reconfigure_main(int argc, char **argv);
int gpiocli_release_main(int argc, char **argv);
int gpiocli_request_main(int argc, char **argv);
int gpiocli_requests_main(int argc, char **argv);
int gpiocli_set_main(int argc, char **argv);
int gpiocli_wait_main(int argc, char **argv);
static const GPIOCliCmd cli_cmds[] = {
{
.name = "detect",
.main_func = gpiocli_detect_main,
.descr = "list GPIO chips and print their properties",
},
{
.name = "find",
.main_func = gpiocli_find_main,
.descr = "take a line name and find its parent chip's name and offset within it",
},
{
.name = "info",
.main_func = gpiocli_info_main,
.descr = "print information about GPIO lines",
},
{
.name = "get",
.main_func = gpiocli_get_main,
.descr = "get values of GPIO lines",
},
{
.name = "monitor",
.main_func = gpiocli_monitor_main,
.descr = "notify the user about edge events",
},
{
.name = "notify",
.main_func = gpiocli_notify_main,
.descr = "notify the user about line property changes",
},
{
.name = "reconfigure",
.main_func = gpiocli_reconfigure_main,
.descr = "change the line configuration for an existing request",
},
{
.name = "release",
.main_func = gpiocli_release_main,
.descr = "release one of the line requests controlled by the manager",
},
{
.name = "request",
.main_func = gpiocli_request_main,
.descr = "request a set of GPIO lines for exclusive usage by the manager",
},
{
.name = "requests",
.main_func = gpiocli_requests_main,
.descr = "list all line requests controlled by the manager",
},
{
.name = "set",
.main_func = gpiocli_set_main,
.descr = "set values of GPIO lines",
},
{
.name = "wait",
.main_func = gpiocli_wait_main,
.descr = "wait for the gpio-manager interface to appear",
},
{ }
};
static GHashTable *make_cmd_table(void)
{
GHashTable *cmd_table = g_hash_table_new_full(g_str_hash, g_str_equal,
NULL, NULL);
const GPIOCliCmd *cmd;
for (cmd = &cli_cmds[0]; cmd->name; cmd++)
g_hash_table_insert(cmd_table, cmd->name, cmd->main_func);
return cmd_table;
}
static gchar *make_description(void)
{
g_autoptr(GString) descr = g_string_new("Available commands:\n");
const GPIOCliCmd *cmd;
for (cmd = &cli_cmds[0]; cmd->name; cmd++)
g_string_append_printf(descr, " %s - %s\n",
cmd->name, cmd->descr);
g_string_truncate(descr, descr->len - 1);
return g_strdup(descr->str);
}
static void show_version_and_exit(void)
{
g_print("gpiocli v%s\n", GPIOD_VERSION_STR);
exit(EXIT_SUCCESS);
}
int main(int argc, char **argv)
{
static const gchar *const summary =
"Simple command-line client for controlling gpio-manager.";
g_autoptr(GHashTable) cmd_table = make_cmd_table();
g_autofree gchar *description = make_description();
g_autofree gchar *basename = NULL;
g_autofree gchar *cmd_name = NULL;
gint (*cmd_func)(gint, gchar **);
g_auto(GStrv) cmd_args = NULL;
gboolean show_version = FALSE;
const GOptionEntry opts[] = {
{
.long_name = "version",
.short_name = 'v',
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_NONE,
.arg_data = &show_version,
.description = "Show version and exit.",
},
{
.long_name = G_OPTION_REMAINING,
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING_ARRAY,
.arg_data = &cmd_args,
.arg_description = "CMD [ARGS?] ...",
},
{ }
};
basename = g_path_get_basename(argv[0]);
g_set_prgname(basename);
parse_options(opts, summary, description, &argc, &argv);
if (show_version)
show_version_and_exit();
if (!cmd_args)
die_parsing_opts("Command must be specified.");
cmd_func = g_hash_table_lookup(cmd_table, cmd_args[0]);
if (!cmd_func)
die_parsing_opts("Unknown command: %s.", cmd_args[0]);
cmd_name = g_strdup_printf("%s %s", basename, cmd_args[0]);
g_set_prgname(cmd_name);
return cmd_func(g_strv_length(cmd_args), cmd_args);
}

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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <stdlib.h>
#include <string.h>
#include "common.h"
static gchar *make_line_name(const gchar *name)
{
if (!name)
return g_strdup("unnamed");
return g_strdup_printf("\"%s\"", name);
}
static void do_print_line_info(GpiodbusObject *line_obj,
GpiodbusObject *chip_obj)
{
g_autoptr(LineProperties) props = NULL;
g_autoptr(GString) attributes = NULL;
g_autofree gchar *line_name = NULL;
GpiodbusChip *chip;
props = get_line_properties(gpiodbus_object_peek_line(line_obj));
line_name = make_line_name(props->name);
attributes = g_string_new("[");
if (props->used)
g_string_append_printf(attributes, "used,consumer=\"%s\",",
props->consumer);
if (props->managed)
g_string_append_printf(attributes, "managed=\"%s\",",
props->request_name);
if (props->edge) {
g_string_append_printf(attributes, "edges=%s,event-clock=%s,",
props->edge, props->event_clock);
if (props->debounced)
g_string_append_printf(attributes,
"debounce-period=%lu,",
props->debounce_period);
}
if (props->bias)
g_string_append_printf(attributes, "bias=%s,", props->bias);
if (props->active_low)
attributes = g_string_append(attributes, "active-low,");
g_string_append_printf(attributes, "%s", props->direction);
if (g_strcmp0(props->direction, "output") == 0)
g_string_append_printf(attributes, ",%s", props->drive);
attributes = g_string_append(attributes, "]");
if (chip_obj) {
chip = gpiodbus_object_peek_chip(chip_obj);
g_print("%s ", gpiodbus_chip_get_name(chip));
} else {
g_print("\tline ");
}
g_print("%3u:\t%s\t\t%s\n", props->offset, line_name, attributes->str);
}
static void print_line_info(gpointer elem, gpointer user_data G_GNUC_UNUSED)
{
GpiodbusObject *line_obj = elem;
do_print_line_info(line_obj, NULL);
}
static void do_show_chip(GpiodbusObject *chip_obj)
{
GpiodbusChip *chip = gpiodbus_object_peek_chip(chip_obj);
g_autolist(GpiodbusObject) line_objs = NULL;
g_print("%s - %u lines:\n",
gpiodbus_chip_get_name(chip),
gpiodbus_chip_get_num_lines(chip));
line_objs = get_all_line_objs_for_chip(chip_obj);
g_list_foreach(line_objs, print_line_info, NULL);
}
static void show_chip(gpointer elem, gpointer user_data G_GNUC_UNUSED)
{
GpiodbusObject *chip_obj = elem;
do_show_chip(chip_obj);
}
static void show_line_with_chip(gpointer elem, gpointer user_data)
{
g_autoptr(GpiodbusObject) line_obj = NULL;
GpiodbusObject *chip_obj = user_data;
g_autofree gchar *chip_name = NULL;
GString *line_name = elem;
line_obj = get_line_obj_by_name_for_chip(chip_obj, line_name->str);
if (!line_obj) {
chip_name = g_path_get_basename(
g_dbus_object_get_object_path(G_DBUS_OBJECT(chip_obj)));
die("no line '%s' on chip '%s'", line_name->str, chip_name);
}
do_print_line_info(line_obj, chip_obj);
}
static void show_line(gpointer elem, gpointer user_data G_GNUC_UNUSED)
{
g_autoptr(GpiodbusObject) line_obj = NULL;
g_autoptr(GpiodbusObject) chip_obj = NULL;
GString *line_name = elem;
gboolean ret;
ret = get_line_obj_by_name(line_name->str, &line_obj, &chip_obj);
if (!ret)
die("line '%s' not found", line_name->str);
do_print_line_info(line_obj, chip_obj);
}
int gpiocli_info_main(int argc, char **argv)
{
static const gchar *const summary =
"Print information about GPIO lines.";
static const gchar *const description =
"Lines are specified by name, or optionally by offset if the chip option\n"
"is provided.\n";
g_autolist(GpiodbusObject) chip_objs = NULL;
g_autolist(GString) line_name_list = NULL;
g_autoptr(GpiodbusObject) chip_obj = NULL;
g_auto(GStrv) line_names = NULL;
const gchar *chip_name = NULL;
const GOptionEntry opts[] = {
{
.long_name = "chip",
.short_name = 'c',
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING,
.arg_data = &chip_name,
.description = "restrict scope to a particular chip",
.arg_description = "<chip>",
},
{
.long_name = G_OPTION_REMAINING,
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING_ARRAY,
.arg_data = &line_names,
.arg_description = "[line1] [line2] ...",
},
{ }
};
parse_options(opts, summary, description, &argc, &argv);
check_manager();
if (chip_name)
chip_obj = get_chip_obj(chip_name);
if (line_names) {
line_name_list = strv_to_gstring_list(line_names);
if (chip_obj)
g_list_foreach(line_name_list, show_line_with_chip,
chip_obj);
else
g_list_foreach(line_name_list, show_line, NULL);
} else if (chip_obj) {
do_show_chip(chip_obj);
} else {
chip_objs = get_chip_objs(NULL);
g_list_foreach(chip_objs, show_chip, NULL);
}
return EXIT_SUCCESS;
}

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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2024 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <gio/gio.h>
#include <glib-unix.h>
#include <stdlib.h>
#include <string.h>
#include "common.h"
typedef struct {
GList *lines;
} MonitorData;
static void on_edge_event(GpiodbusLine *line, GVariant *args,
gpointer user_data G_GNUC_UNUSED)
{
const char *name = gpiodbus_line_get_name(line);
gulong global_seqno, line_seqno;
guint64 timestamp;
gint edge;
g_variant_get(args, "(ittt)", &edge, &timestamp,
&global_seqno, &line_seqno);
g_print("%lu %s ", timestamp, edge ? "rising " : "falling");
if (strlen(name))
g_print("\"%s\"\n", name);
else
g_print("%u\n", gpiodbus_line_get_offset(line));
}
static void connect_edge_event(gpointer elem, gpointer user_data)
{
GpiodbusObject *line_obj = elem;
MonitorData *data = user_data;
g_autoptr(GError) err = NULL;
const gchar *line_obj_path;
GpiodbusLine *line;
line_obj_path = g_dbus_object_get_object_path(G_DBUS_OBJECT(line_obj));
line = gpiodbus_line_proxy_new_for_bus_sync(G_BUS_TYPE_SYSTEM,
G_DBUS_PROXY_FLAGS_NONE,
"io.gpiod1", line_obj_path,
NULL, &err);
if (err)
die_gerror(err, "Failed to get D-Bus proxy for '%s'",
line_obj_path);
if (!gpiodbus_line_get_managed(line))
die("Line must be managed by gpio-manager in order to be monitored");
if (g_strcmp0(gpiodbus_line_get_edge_detection(line), "none") == 0)
die("Edge detection must be enabled for monitored lines");
data->lines = g_list_append(data->lines, line);
g_signal_connect(line, "edge-event", G_CALLBACK(on_edge_event), NULL);
}
int gpiocli_monitor_main(int argc, char **argv)
{
static const gchar *const summary =
"Get values of one or more GPIO lines.";
static const gchar *const description =
"If -r/--request is specified then all the lines must belong to the same\n"
"request (and - by extension - the same chip).\n"
"\n"
"If no lines are specified but -r/--request was passed then all lines within\n"
"the request will be used.";
g_autoptr(GDBusObjectManager) manager = NULL;
const gchar *request_name = NULL, *chip_path;
g_autolist(GpiodbusObject) line_objs = NULL;
g_autoptr(GpiodbusObject) chip_obj = NULL;
g_autoptr(GpiodbusObject) req_obj = NULL;
g_autoptr(GArray) offsets = NULL;
g_autoptr(GMainLoop) loop = NULL;
g_auto(GStrv) lines = NULL;
GpiodbusRequest *request;
MonitorData data = { };
gsize num_lines, i;
guint watch_id;
gboolean ret;
const GOptionEntry opts[] = {
{
.long_name = "request",
.short_name = 'r',
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING,
.arg_data = &request_name,
.description = "restrict scope to a particular request",
.arg_description = "<request>",
},
{
.long_name = G_OPTION_REMAINING,
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING_ARRAY,
.arg_data = &lines,
.arg_description = "[line0] [line1]...",
},
{ }
};
parse_options(opts, summary, description, &argc, &argv);
watch_id = g_bus_watch_name(G_BUS_TYPE_SYSTEM, "io.gpiod1",
G_BUS_NAME_WATCHER_FLAGS_NONE,
NULL, die_on_name_vanished, NULL, NULL);
check_manager();
if (!lines && !request_name)
die_parsing_opts("either at least one line or the request must be specified");
if (request_name) {
req_obj = get_request_obj(request_name);
request = gpiodbus_object_peek_request(req_obj);
chip_path = gpiodbus_request_get_chip_path(request);
chip_obj = get_chip_obj_by_path(chip_path);
offsets = g_array_new(FALSE, TRUE, sizeof(guint));
if (lines) {
num_lines = g_strv_length(lines);
for (i = 0; i < num_lines; i++) {
g_autoptr(GpiodbusObject) line_obj = NULL;
line_obj = get_line_obj_by_name_for_chip(
chip_obj, lines[i]);
if (!line_obj)
die("Line not found: %s\n", lines[i]);
line_objs = g_list_append(line_objs,
g_object_ref(line_obj));
}
} else {
offsets = get_request_offsets(request);
manager = get_object_manager_client(chip_path);
for (i = 0; i < offsets->len; i++) {
g_autoptr(GpiodbusObject) line_obj = NULL;
g_autofree char *obj_path = NULL;
obj_path = g_strdup_printf("%s/line%u",
chip_path,
g_array_index(
offsets,
guint, i));
line_obj = GPIODBUS_OBJECT(
g_dbus_object_manager_get_object(
manager,
obj_path));
if (!line_obj)
die("Line not found: %u\n",
g_array_index(offsets, guint, i));
line_objs = g_list_append(line_objs,
g_object_ref(line_obj));
}
}
} else {
num_lines = g_strv_length(lines);
for (i = 0; i < num_lines; i++) {
g_autoptr(GpiodbusObject) line_obj = NULL;
ret = get_line_obj_by_name(lines[i], &line_obj, NULL);
if (!ret)
die("Line not found: %s\n", lines[i]);
line_objs = g_list_append(line_objs,
g_object_ref(line_obj));
}
}
g_list_foreach(line_objs, connect_edge_event, &data);
loop = g_main_loop_new(NULL, FALSE);
g_unix_signal_add(SIGTERM, quit_main_loop_on_signal, loop);
g_unix_signal_add(SIGINT, quit_main_loop_on_signal, loop);
g_main_loop_run(loop);
g_bus_unwatch_name(watch_id);
return EXIT_SUCCESS;
}

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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <gio/gio.h>
#include <glib-unix.h>
#include <stdlib.h>
#include "common.h"
/*
* Used to keep line proxies and chip interfaces alive for the duration of the
* program, which is required for signals to work.
*/
typedef struct {
GList *lines;
GList *chips;
GpiodbusObject *scoped_chip;
} NotifyData;
static void clear_notify_data(NotifyData *data)
{
g_list_free_full(data->lines, g_object_unref);
g_list_free_full(data->chips, g_object_unref);
if (data->scoped_chip)
g_clear_object(&data->scoped_chip);
}
G_DEFINE_AUTO_CLEANUP_CLEAR_FUNC(NotifyData, clear_notify_data);
static const gchar *bool_to_str(gboolean val)
{
return val ? "True" : "False";
}
static const gchar *bool_variant_to_str(GVariant *val)
{
return bool_to_str(g_variant_get_boolean(val));
}
static void
on_properties_changed(GpiodbusLine *line, GVariant *changed_properties,
GStrv invalidated_properties G_GNUC_UNUSED,
gpointer user_data)
{
GpiodbusChip *chip = user_data;
g_autofree gchar *name = NULL;
const gchar *consumer, *tmp;
GVariantIter iter;
GVariant *v;
gsize len;
gchar *k;
if (g_variant_n_children(changed_properties) == 0)
return;
tmp = gpiodbus_line_get_name(line);
name = tmp ? g_strdup_printf("\"%s\"", tmp) : g_strdup("unnamed");
g_variant_iter_init(&iter, changed_properties);
while (g_variant_iter_next(&iter, "{sv}", &k, &v)) {
g_autoptr(GString) change = g_string_new(NULL);
g_autofree gchar *req_name = NULL;
g_autoptr(GVariant) val = v;
g_autofree gchar *key = k;
if (g_strcmp0(key, "Consumer") == 0) {
consumer = g_variant_get_string(val, &len);
g_string_printf(change, "consumer=>\"%s\"",
len ? consumer : "unused");
} else if (g_strcmp0(key, "Used") == 0) {
g_string_printf(change, "used=>%s",
bool_variant_to_str(val));
} else if (g_strcmp0(key, "Debounced") == 0) {
g_string_printf(change, "debounced=>%s",
bool_variant_to_str(val));
} else if (g_strcmp0(key, "ActiveLow") == 0) {
g_string_printf(change, "active-low=>%s",
bool_variant_to_str(val));
} else if (g_strcmp0(key, "Direction") == 0) {
g_string_printf(change, "direction=>%s",
g_variant_get_string(val, NULL));
} else if (g_strcmp0(key, "Drive") == 0) {
g_string_printf(change, "drive=>%s",
g_variant_get_string(val, NULL));
} else if (g_strcmp0(key, "Bias") == 0) {
g_string_printf(change, "bias=>%s",
g_variant_get_string(val, NULL));
} else if (g_strcmp0(key, "EdgeDetection") == 0) {
g_string_printf(change, "edge=>%s",
g_variant_get_string(val, NULL));
} else if (g_strcmp0(key, "EventClock") == 0) {
g_string_printf(change, "event-clock=>%s",
g_variant_get_string(val, NULL));
} else if (g_strcmp0(key, "DebouncePeriodUs") == 0) {
g_string_printf(change, "debounce-period=>%ld",
g_variant_get_uint64(val));
} else if (g_strcmp0(key, "Managed") == 0) {
g_string_printf(change, "managed=>%s",
bool_variant_to_str(val));
} else if (g_strcmp0(key, "RequestPath") == 0) {
req_name = sanitize_object_path(
g_variant_get_string(val, NULL));
g_string_printf(change, "request=>%s",
req_name);
} else {
die("unexpected property update received from manager: '%s'",
key);
}
g_print("%s - %u (%s): [%s]\n", gpiodbus_chip_get_name(chip),
gpiodbus_line_get_offset(line), name ?: "unnamed",
change->str);
}
}
static void print_line_info(GpiodbusLine *line, GpiodbusChip *chip)
{
g_autoptr(LineProperties) props = get_line_properties(line);
g_autoptr(GString) attrs = g_string_new(props->direction);
g_autofree gchar *name = NULL;
if (props->used)
g_string_append(attrs, ",used");
if (props->consumer)
g_string_append_printf(attrs, ",consumer=\"%s\"",
props->consumer);
if (props->drive && g_strcmp0(props->direction, "output") == 0)
g_string_append_printf(attrs, ",%s", props->drive);
if (props->bias) {
if (g_strcmp0(props->bias, "disabled") == 0)
g_string_append(attrs, ",bias-disabled");
else
g_string_append_printf(attrs, ",%s", props->bias);
}
if (props->active_low)
g_string_append(attrs, ",active-low");
if (props->edge) {
if (g_strcmp0(props->edge, "both") == 0)
g_string_append(attrs, ",both-edges");
else
g_string_append_printf(attrs, ",%s-edge", props->edge);
g_string_append_printf(attrs, ",%s-clock", props->event_clock);
if (props->debounced)
g_string_append_printf(attrs,
"debounced,debounce-period=%lu",
props->debounce_period);
}
if (props->managed)
g_string_append_printf(attrs, ",managed,request=\"%s\"",
props->request_name);
name = props->name ? g_strdup_printf("\"%s\"", props->name) :
g_strdup("unnamed");
g_print("%s - %u (%s): [%s]\n", gpiodbus_chip_get_name(chip),
props->offset, name ?: "unnamed", attrs->str);
}
static void connect_line(gpointer elem, gpointer user_data)
{
g_autoptr(GpiodbusObject) line_obj = NULL;
g_autoptr(GpiodbusObject) chip_obj = NULL;
g_autoptr(GpiodbusLine) line = NULL;
g_autoptr(GpiodbusChip) chip = NULL;
g_autofree gchar *chip_name = NULL;
g_autoptr(GError) err = NULL;
NotifyData *data = user_data;
const gchar *line_obj_path;
GString *line_name = elem;
gboolean ret;
if (data->scoped_chip) {
chip_obj = g_object_ref(data->scoped_chip);
line_obj = get_line_obj_by_name_for_chip(chip_obj,
line_name->str);
if (!line_obj) {
chip_name = g_path_get_basename(
g_dbus_object_get_object_path(
G_DBUS_OBJECT(chip_obj)));
die("no line '%s' on chip '%s'",
line_name->str, chip_name);
}
} else {
ret = get_line_obj_by_name(line_name->str,
&line_obj, &chip_obj);
if (!ret)
die("line '%s' not found", line_name->str);
}
line_obj_path = g_dbus_object_get_object_path(G_DBUS_OBJECT(line_obj));
line = gpiodbus_line_proxy_new_for_bus_sync(G_BUS_TYPE_SYSTEM,
G_DBUS_PROXY_FLAGS_NONE,
"io.gpiod1", line_obj_path,
NULL, &err);
if (err)
die_gerror(err, "Failed to get D-Bus proxy for '%s'",
line_obj_path);
data->lines = g_list_append(data->lines, g_object_ref(line));
if (data->scoped_chip) {
if (g_list_length(data->chips) == 0) {
chip = gpiodbus_object_get_chip(chip_obj);
data->chips = g_list_append(data->chips,
g_object_ref(chip));
} else {
chip = g_list_first(data->chips)->data;
}
} else {
chip = gpiodbus_object_get_chip(chip_obj);
data->chips = g_list_append(data->chips, g_object_ref(chip));
}
print_line_info(line, chip);
g_signal_connect(line, "g-properties-changed",
G_CALLBACK(on_properties_changed), chip);
}
int gpiocli_notify_main(int argc, char **argv)
{
static const gchar *const summary =
"Monitor a set of lines for property changes.";
static const gchar *const description =
"Lines are specified by name, or optionally by offset if the chip option\n"
"is provided.\n";
g_autolist(GString) line_name_list = NULL;
g_autoptr(GMainLoop) loop = NULL;
g_auto(GStrv) line_names = NULL;
const gchar *chip_name = NULL;
/*
* FIXME: data internals must be freed but there's some issue with
* unrefing the GpiodbusObject here. For now it's leaking memory.
*/
NotifyData data = { };
guint watch_id;
const GOptionEntry opts[] = {
{
.long_name = "chip",
.short_name = 'c',
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING,
.arg_data = &chip_name,
.description = "restrict scope to a particular chip",
.arg_description = "<chip>",
},
{
.long_name = G_OPTION_REMAINING,
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING_ARRAY,
.arg_data = &line_names,
.arg_description = "<line1> [line2] ...",
},
{ }
};
parse_options(opts, summary, description, &argc, &argv);
watch_id = g_bus_watch_name(G_BUS_TYPE_SYSTEM, "io.gpiod1",
G_BUS_NAME_WATCHER_FLAGS_NONE,
NULL, die_on_name_vanished, NULL, NULL);
check_manager();
if (!line_names)
die_parsing_opts("at least one line must be specified");
if (chip_name)
data.scoped_chip = get_chip_obj(chip_name);
line_name_list = strv_to_gstring_list(line_names);
g_list_foreach(line_name_list, connect_line, &data);
loop = g_main_loop_new(NULL, FALSE);
g_unix_signal_add(SIGTERM, quit_main_loop_on_signal, loop);
g_unix_signal_add(SIGINT, quit_main_loop_on_signal, loop);
g_main_loop_run(loop);
g_bus_unwatch_name(watch_id);
return EXIT_SUCCESS;
}

76
dbus/client/reconfigure.c Normal file
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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2024 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <stdlib.h>
#include "common.h"
int gpiocli_reconfigure_main(int argc, char **argv)
{
static const gchar *const summary =
"Change the line configuration for an existing request.";
g_autoptr(GpiodbusObject) req_obj = NULL;
g_autoptr(GVariant) line_config = NULL;
g_autoptr(GArray) output_values = NULL;
LineConfigOpts line_cfg_opts = { };
g_autoptr(GArray) offsets = NULL;
g_auto(GStrv) remaining = NULL;
g_autoptr(GError) err = NULL;
GpiodbusRequest *request;
gsize num_values;
gboolean ret;
gint val;
guint i;
const GOptionEntry opts[] = {
LINE_CONFIG_OPTIONS(&line_cfg_opts),
{
.long_name = G_OPTION_REMAINING,
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING_ARRAY,
.arg_data = &remaining,
.arg_description = "<request> [value1] [value2]...",
},
{ }
};
parse_options(opts, summary, NULL, &argc, &argv);
validate_line_config_opts(&line_cfg_opts);
if (!remaining || g_strv_length(remaining) == 0)
die_parsing_opts("Exactly one request to reconfigure must be specified.");
num_values = g_strv_length(remaining) - 1;
check_manager();
req_obj = get_request_obj(remaining[0]);
request = gpiodbus_object_peek_request(req_obj);
offsets = get_request_offsets(request);
if (num_values) {
if (num_values != offsets->len)
die_parsing_opts("The number of output values must correspond to the number of lines in the request");
output_values = g_array_sized_new(FALSE, TRUE, sizeof(gint),
num_values);
for (i = 0; i < num_values; i++) {
val = output_value_from_str(remaining[i + 1]);
g_array_append_val(output_values, val);
}
}
line_cfg_opts.output_values = output_values;
line_config = make_line_config(offsets, &line_cfg_opts);
ret = gpiodbus_request_call_reconfigure_lines_sync(
request, line_config,
G_DBUS_CALL_FLAGS_NONE,
-1, NULL, &err);
if (!ret)
die_gerror(err, "Failed to reconfigure lines");
return EXIT_SUCCESS;
}

64
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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <stdlib.h>
#include "common.h"
int gpiocli_release_main(int argc, char **argv)
{
static const gchar *const summary =
"Release one of the line requests controlled by the manager.";
g_autoptr(GDBusObjectManager) manager = NULL;
g_autoptr(GpiodbusObject) obj = NULL;
g_autofree gchar *obj_path = NULL;
g_auto(GStrv) remaining = NULL;
g_autoptr(GError) err = NULL;
const gchar *request_name;
GpiodbusRequest *request;
gboolean ret;
const GOptionEntry opts[] = {
{
.long_name = G_OPTION_REMAINING,
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING_ARRAY,
.arg_data = &remaining,
.arg_description = "<request>",
},
{ }
};
parse_options(opts, summary, NULL, &argc, &argv);
if (!remaining || g_strv_length(remaining) != 1)
die_parsing_opts("Exactly one request to release must be specified.");
check_manager();
request_name = remaining[0];
obj_path = make_request_obj_path(request_name);
manager = get_object_manager_client("/io/gpiod1/requests");
obj = GPIODBUS_OBJECT(g_dbus_object_manager_get_object(manager,
obj_path));
if (!obj)
goto no_request;
request = gpiodbus_object_peek_request(obj);
if (!request)
goto no_request;
ret = gpiodbus_request_call_release_sync(request,
G_DBUS_CALL_FLAGS_NONE,
-1, NULL, &err);
if (!ret)
die_gerror(err, "Failed to release request '%s': %s",
request_name, err->message);
return EXIT_SUCCESS;
no_request:
die("No such request: '%s'", request_name);
}

250
dbus/client/request.c Normal file
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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2023-2024 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <stdlib.h>
#include "common.h"
typedef struct {
LineConfigOpts line_cfg_opts;
const gchar *consumer;
} RequestOpts;
typedef struct {
const gchar *request_path;
gboolean done;
} RequestWaitData;
static GVariant *make_request_config(RequestOpts *opts)
{
GVariantBuilder builder;
g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
g_variant_builder_add_value(&builder,
g_variant_new("{sv}", "consumer",
g_variant_new_string(opts->consumer)));
return g_variant_ref_sink(g_variant_builder_end(&builder));
}
static gboolean on_timeout(gpointer user_data G_GNUC_UNUSED)
{
die("wait for request to appear timed out!");
}
static void obj_match_request_path(GpiodbusObject *obj, RequestWaitData *data)
{
if (g_strcmp0(g_dbus_object_get_object_path(G_DBUS_OBJECT(obj)),
data->request_path) == 0)
data->done = TRUE;
}
static void match_request_path(gpointer elem, gpointer user_data)
{
RequestWaitData *data = user_data;
GpiodbusObject *obj = elem;
obj_match_request_path(obj, data);
}
static void on_object_added(GDBusObjectManager *manager G_GNUC_UNUSED,
GpiodbusObject *obj, gpointer user_data)
{
RequestWaitData *data = user_data;
obj_match_request_path(GPIODBUS_OBJECT(obj), data);
}
static void wait_for_request(const gchar *request_path)
{
RequestWaitData data = { .request_path = request_path };
g_autoptr(GDBusObjectManager) manager = NULL;
g_autolist(GpiodbusObject) objs = NULL;
manager = get_object_manager_client("/io/gpiod1/requests");
g_signal_connect(manager, "object-added",
G_CALLBACK(on_object_added), &data);
objs = g_dbus_object_manager_get_objects(manager);
g_list_foreach(objs, match_request_path, &data);
g_timeout_add(5000, on_timeout, NULL);
while (!data.done)
g_main_context_iteration(NULL, TRUE);
}
static int
request_lines(GList *line_names, const gchar *chip_name, RequestOpts *req_opts)
{
g_autoptr(GpiodbusObject) chip_obj = NULL;
g_autoptr(GVariant) request_config = NULL;
g_autoptr(GVariant) line_config = NULL;
g_autofree gchar *request_path = NULL;
g_autofree gchar *request_name = NULL;
g_autofree gchar *dyn_name = NULL;
g_autoptr(GArray) offsets = NULL;
g_autoptr(GError) err = NULL;
GpiodbusLine *line;
GpiodbusChip *chip;
GString *line_name;
guint i, *offset;
gboolean ret;
GList *pos;
gsize llen;
llen = g_list_length(line_names);
offsets = g_array_sized_new(FALSE, TRUE, sizeof(guint), llen);
g_array_set_size(offsets, llen);
if (chip_name)
chip_obj = get_chip_obj(chip_name);
for (i = 0, pos = g_list_first(line_names);
i < llen;
i++, pos = g_list_next(pos)) {
g_autoptr(GpiodbusObject) line_obj = NULL;
line_name = pos->data;
if (chip_obj) {
line_obj = get_line_obj_by_name_for_chip(chip_obj,
line_name->str);
if (!line_obj) {
if (dyn_name) {
ret = get_line_obj_by_name(
line_name->str,
&line_obj, NULL);
if (ret)
/*
* This means the line exists
* but on a different chip.
*/
die("all requested lines must belong to the same chip");
}
die("no line '%s' on chip '%s'",
line_name->str, chip_name);
}
} else {
ret = get_line_obj_by_name(line_name->str, &line_obj,
&chip_obj);
if (!ret)
die("line '%s' not found", line_name->str);
dyn_name = g_path_get_basename(
g_dbus_object_get_object_path(
G_DBUS_OBJECT(chip_obj)));
chip_name = dyn_name;
}
line = gpiodbus_object_peek_line(line_obj);
offset = &g_array_index(offsets, guint, i);
*offset = gpiodbus_line_get_offset(line);
}
chip = gpiodbus_object_peek_chip(chip_obj);
line_config = make_line_config(offsets, &req_opts->line_cfg_opts);
request_config = make_request_config(req_opts);
ret = gpiodbus_chip_call_request_lines_sync(chip, line_config,
request_config,
G_DBUS_CALL_FLAGS_NONE, -1,
&request_path, NULL, &err);
if (err)
die_gerror(err, "failed to request lines from chip '%s'",
chip_name);
wait_for_request(request_path);
request_name = g_path_get_basename(request_path);
g_print("%s\n", request_name);
return EXIT_SUCCESS;
}
int gpiocli_request_main(int argc, char **argv)
{
static const gchar *const summary =
"Request a set of GPIO lines for exclusive usage by the gpio-manager.";
g_autoptr(GArray) output_values = NULL;
g_autolist(GString) line_names = NULL;
const gchar *chip_name = NULL;
g_auto(GStrv) lines = NULL;
RequestOpts req_opts = {};
gsize llen;
gint val;
guint i;
const GOptionEntry opts[] = {
{
.long_name = "chip",
.short_name = 'c',
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING,
.arg_data = &chip_name,
.description =
"Explicitly specify the chip_name on which to resolve the lines which allows to use raw offsets instead of line names.",
.arg_description = "<chip name>",
},
{
.long_name = "consumer",
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING,
.arg_data = &req_opts.consumer,
.description = "Consumer string (defaults to program name)",
.arg_description = "<consumer name>",
},
{
.long_name = G_OPTION_REMAINING,
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING_ARRAY,
.arg_data = &lines,
.arg_description = "<line1>[=value1] [line2[=value2]] ...",
},
LINE_CONFIG_OPTIONS(&req_opts.line_cfg_opts),
{ }
};
parse_options(opts, summary, NULL, &argc, &argv);
validate_line_config_opts(&req_opts.line_cfg_opts);
if (!lines)
die_parsing_opts("At least one line must be specified");
if (!req_opts.consumer)
req_opts.consumer = "gpio-manager";
for (i = 0, llen = g_strv_length(lines); i < llen; i++) {
g_auto(GStrv) tokens = NULL;
tokens = g_strsplit(lines[i], "=", 2);
line_names = g_list_append(line_names, g_string_new(tokens[0]));
if (g_strv_length(tokens) == 2) {
if (!req_opts.line_cfg_opts.output)
die_parsing_opts("Output values can only be set in output mode");
if (!output_values)
output_values = g_array_sized_new(FALSE, TRUE,
sizeof(gint),
llen);
val = output_value_from_str(tokens[1]);
g_array_append_val(output_values, val);
}
}
if (output_values && req_opts.line_cfg_opts.input)
die_parsing_opts("cannot set output values in input mode");
if (output_values &&
(g_list_length(line_names) != output_values->len))
die_parsing_opts("if values are set, they must be set for all lines");
req_opts.line_cfg_opts.output_values = output_values;
check_manager();
return request_lines(line_names, chip_name, &req_opts);
}

71
dbus/client/requests.c Normal file
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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <stdlib.h>
#include "common.h"
static void show_request(gpointer elem, gpointer user_data G_GNUC_UNUSED)
{
g_autoptr(GDBusObjectManager) manager = NULL;
g_autofree gchar *request_name = NULL;
g_autofree gchar *offsets_str = NULL;
g_autoptr(GVariant) voffsets = NULL;
g_autofree gchar *chip_name = NULL;
g_autoptr(GArray) offsets = NULL;
GpiodbusObject *obj = elem;
GpiodbusRequest *request;
GVariantBuilder builder;
const gchar *chip_path;
gsize i;
request_name = g_path_get_basename(
g_dbus_object_get_object_path(G_DBUS_OBJECT(obj)));
request = gpiodbus_object_peek_request(obj);
chip_path = gpiodbus_request_get_chip_path(request);
manager = get_object_manager_client(chip_path);
/* FIXME: Use chip proxy? */
chip_name = g_path_get_basename(chip_path);
offsets = get_request_offsets(request);
g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
for (i = 0; i < offsets->len; i++)
g_variant_builder_add(&builder, "u",
g_array_index(offsets, guint, i));
voffsets = g_variant_ref_sink(g_variant_builder_end(&builder));
offsets_str = g_variant_print(voffsets, FALSE);
g_print("%s (%s) Offsets: %s\n",
request_name, chip_name, offsets_str);
}
int gpiocli_requests_main(int argc, char **argv)
{
static const gchar *const summary =
"List all line requests controlled by the manager.";
g_autolist(GpiodbusObject) request_objs = NULL;
g_auto(GStrv) remaining = NULL;
const GOptionEntry opts[] = {
{
.long_name = G_OPTION_REMAINING,
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING_ARRAY,
.arg_data = &remaining,
.arg_description = NULL,
},
{ }
};
parse_options(opts, summary, NULL, &argc, &argv);
check_manager();
if (remaining)
die_parsing_opts("command doesn't take additional arguments");
request_objs = get_request_objs();
g_list_foreach(request_objs, show_request, NULL);
return EXIT_SUCCESS;
}

173
dbus/client/set.c Normal file
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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2024 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <stdlib.h>
#include "common.h"
static void free_str(gpointer data)
{
GString *str = data;
g_string_free(str, TRUE);
}
int gpiocli_set_main(int argc, char **argv)
{
static const gchar *const summary =
"Set values of one or more GPIO lines.";
static const gchar *const description =
"If -r/--request is specified then all the lines must belong to the same\n"
"request (and - by extension - the same chip).";
const gchar *request_name = NULL, *chip_path, *req_path;
g_autoptr(GpiodbusObject) chip_obj = NULL;
g_autoptr(GpiodbusObject) req_obj = NULL;
g_autoptr(GPtrArray) line_names = NULL;
g_autoptr(GArray) values = NULL;
g_autoptr(GError) err = NULL;
g_auto(GStrv) lines = NULL;
GpiodbusRequest *request;
GVariantBuilder builder;
GpiodbusLine *line;
gsize num_lines, i;
GString *line_name;
gboolean ret;
guint offset;
gint val;
const GOptionEntry opts[] = {
{
.long_name = "request",
.short_name = 'r',
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING,
.arg_data = &request_name,
.description = "restrict scope to a particular request",
.arg_description = "<request>",
},
{
.long_name = G_OPTION_REMAINING,
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING_ARRAY,
.arg_data = &lines,
.arg_description = "<line1=value1> [line2=value2] ...",
},
{ }
};
parse_options(opts, summary, description, &argc, &argv);
if (!lines)
die_parsing_opts("at least one line value must be specified");
num_lines = g_strv_length(lines);
line_names = g_ptr_array_new_full(num_lines, free_str);
values = g_array_sized_new(FALSE, TRUE, sizeof(gint), num_lines);
for (i = 0; i < num_lines; i++) {
g_auto(GStrv) tokens = NULL;
tokens = g_strsplit(lines[i], "=", 2);
if (g_strv_length(tokens) != 2)
die_parsing_opts("line must have a single value assigned");
g_ptr_array_add(line_names, g_string_new(tokens[0]));
val = output_value_from_str(tokens[1]);
g_array_append_val(values, val);
}
check_manager();
if (request_name) {
g_autoptr(GVariant) arg_values = NULL;
g_autoptr(GArray) offsets = NULL;
req_obj = get_request_obj(request_name);
request = gpiodbus_object_peek_request(req_obj);
chip_path = gpiodbus_request_get_chip_path(request);
chip_obj = get_chip_obj_by_path(chip_path);
offsets = g_array_sized_new(FALSE, TRUE, sizeof(guint),
num_lines);
for (i = 0; i < num_lines; i++) {
g_autoptr(GpiodbusObject) line_obj = NULL;
line_name = g_ptr_array_index(line_names, i);
line_obj = get_line_obj_by_name_for_chip(chip_obj,
line_name->str);
if (!line_obj)
die("Line not found: %s\n", line_name->str);
line = gpiodbus_object_peek_line(line_obj);
offset = gpiodbus_line_get_offset(line);
g_array_append_val(offsets, offset);
}
g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
for (i = 0; i < num_lines; i++) {
g_variant_builder_add(&builder, "{ui}",
g_array_index(offsets, guint, i),
g_array_index(values, gint, i));
}
arg_values = g_variant_ref_sink(
g_variant_builder_end(&builder));
ret = gpiodbus_request_call_set_values_sync(
request, arg_values,
G_DBUS_CALL_FLAGS_NONE,
-1, NULL, &err);
if (!ret)
die_gerror(err, "Failed to set line values");
return EXIT_SUCCESS;
}
for (i = 0; i < num_lines; i++) {
g_autoptr(GpiodbusRequest) req_proxy = NULL;
g_autoptr(GpiodbusObject) line_obj = NULL;
g_autoptr(GVariant) arg_values = NULL;
line_name = g_ptr_array_index(line_names, i);
ret = get_line_obj_by_name(line_name->str, &line_obj, NULL);
if (!ret)
die("Line not found: %s\n", line_name->str);
line = gpiodbus_object_peek_line(line_obj);
req_path = gpiodbus_line_get_request_path(line);
if (!gpiodbus_line_get_managed(line))
die("Line '%s' not managed by gpio-manager, must be requested first",
line_name->str);
req_proxy = gpiodbus_request_proxy_new_for_bus_sync(
G_BUS_TYPE_SYSTEM,
G_DBUS_PROXY_FLAGS_NONE,
"io.gpiod1", req_path,
NULL, &err);
if (err)
die_gerror(err, "Failed to get D-Bus proxy for '%s'",
req_path);
offset = gpiodbus_line_get_offset(line);
g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
g_variant_builder_add(&builder, "{ui}", offset,
g_array_index(values, gint, i));
arg_values = g_variant_ref_sink(
g_variant_builder_end(&builder));
ret = gpiodbus_request_call_set_values_sync(
req_proxy, arg_values,
G_DBUS_CALL_FLAGS_NONE, -1,
NULL, &err);
if (!ret)
die_gerror(err, "Failed to set line values");
}
return EXIT_SUCCESS;
}

188
dbus/client/wait.c Normal file
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@@ -0,0 +1,188 @@
// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <stdlib.h>
#include "common.h"
typedef struct {
gboolean name_done;
gboolean chip_done;
const gchar *label;
} WaitData;
static void obj_match_label(GpiodbusObject *chip_obj, WaitData *data)
{
GpiodbusChip *chip = gpiodbus_object_peek_chip(chip_obj);
if (g_strcmp0(gpiodbus_chip_get_label(chip), data->label) == 0)
data->chip_done = TRUE;
}
static void check_label(gpointer elem, gpointer user_data)
{
WaitData *data = user_data;
GpiodbusObject *obj = elem;
obj_match_label(obj, data);
}
static void on_object_added(GDBusObjectManager *manager G_GNUC_UNUSED,
GpiodbusObject *obj, gpointer user_data)
{
WaitData *data = user_data;
obj_match_label(GPIODBUS_OBJECT(obj), data);
}
static void wait_for_chip(WaitData *data)
{
g_autoptr(GDBusObjectManager) manager = NULL;
g_autolist(GpiodbusObject) objs = NULL;
manager = get_object_manager_client("/io/gpiod1/chips");
g_signal_connect(manager, "object-added",
G_CALLBACK(on_object_added), data);
objs = g_dbus_object_manager_get_objects(manager);
g_list_foreach(objs, check_label, data);
while (!data->chip_done)
g_main_context_iteration(NULL, TRUE);
}
static void on_name_appeared(GDBusConnection *con G_GNUC_UNUSED,
const gchar *name G_GNUC_UNUSED,
const gchar *name_owner G_GNUC_UNUSED,
gpointer user_data)
{
WaitData *data = user_data;
data->name_done = TRUE;
}
static void on_name_vanished(GDBusConnection *con G_GNUC_UNUSED,
const gchar *name G_GNUC_UNUSED,
gpointer user_data)
{
WaitData *data = user_data;
if (data->label && data->chip_done)
die("gpio-manager vanished while waiting for chip");
}
static gboolean on_timeout(gpointer user_data G_GNUC_UNUSED)
{
die("wait timed out!");
}
static guint schedule_timeout(const gchar *timeout)
{
gint64 period, multiplier = 0;
gchar *end;
period = g_ascii_strtoll(timeout, &end, 10);
switch (*end) {
case 'm':
multiplier = 1;
end++;
break;
case 's':
multiplier = 1000;
break;
case '\0':
break;
default:
goto invalid_timeout;
}
if (multiplier) {
if (*end != 's')
goto invalid_timeout;
end++;
} else {
/* Default to miliseconds. */
multiplier = 1;
}
period *= multiplier;
if (period > G_MAXUINT)
die("timeout must not exceed %u miliseconds\n", G_MAXUINT);
return g_timeout_add(period, on_timeout, NULL);
invalid_timeout:
die("invalid timeout value: %s", timeout);
}
int gpiocli_wait_main(int argc, char **argv)
{
static const gchar *const summary =
"Wait for the gpio-manager interface to appear.";
static const gchar *const description =
"Timeout period defaults to miliseconds but can be given in seconds or miliseconds\n"
"explicitly .e.g: --timeout=1000, --timeout=1000ms and --timeout=1s all specify\n"
"the same period.";
const gchar *timeout_str = NULL;
guint watch_id, timeout_id = 0;
g_auto(GStrv) remaining = NULL;
WaitData data = {};
const GOptionEntry opts[] = {
{
.long_name = "chip",
.short_name = 'c',
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING,
.arg_data = &data.label,
.description = "Wait for a specific chip to appear.",
.arg_description = "<label>",
},
{
.long_name = "timeout",
.short_name = 't',
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING,
.arg_data = &timeout_str,
.description = "Bail-out if timeout expires.",
.arg_description = "<timeout_str>",
},
{
.long_name = G_OPTION_REMAINING,
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING_ARRAY,
.arg_data = &remaining,
},
{ }
};
parse_options(opts, summary, description, &argc, &argv);
if (remaining)
die_parsing_opts("command doesn't take additional arguments");
watch_id = g_bus_watch_name(G_BUS_TYPE_SYSTEM, "io.gpiod1",
G_BUS_NAME_WATCHER_FLAGS_NONE,
on_name_appeared, on_name_vanished,
&data, NULL);
if (timeout_str)
timeout_id = schedule_timeout(timeout_str);
while (!data.name_done)
g_main_context_iteration(NULL, TRUE);
if (data.label)
wait_for_chip(&data);
g_bus_unwatch_name(watch_id);
if (timeout_str)
g_source_remove(timeout_id);
return EXIT_SUCCESS;
}

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dbus/data/90-gpio.rules Normal file
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# SPDX-License-Identifier: CC0-1.0
# SPDX-FileCopyrightText: 2024 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
SUBSYSTEM=="gpio", KERNEL=="gpiochip[0-9]*", GROUP="gpio", MODE="0660"

16
dbus/data/Makefile.am Normal file
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# SPDX-License-Identifier: GPL-2.0-or-later
# SPDX-FileCopyrightText: 2022-2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
EXTRA_DIST = gpio-manager.service
dbusdir = $(sysconfdir)/dbus-1/system.d/
dbus_DATA = io.gpiod1.conf
if WITH_SYSTEMD
systemdsystemunit_DATA = gpio-manager.service
udevdir = $(libdir)/udev/rules.d/
udev_DATA = 90-gpio.rules
endif

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dbus/data/gpio-manager.service Normal file
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# SPDX-License-Identifier: CC0-1.0
# SPDX-FileCopyrightText: 2023-2024 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
[Unit]
Description=Centralized GPIO manager daemon
[Service]
Type=dbus
BusName=io.gpiod1
ExecStart=/usr/bin/gpio-manager
Restart=always
User=gpio-manager
CapabilityBoundingSet=
ReadOnlyDirectories=/
NoNewPrivileges=yes
RemoveIPC=yes
PrivateTmp=yes
PrivateUsers=yes
ProtectControlGroups=yes
ProtectHome=yes
ProtectKernelModules=yes
ProtectKernelTunables=yes
ProtectSystem=strict
ProtectClock=yes
Delegate=no
IPAddressDeny=any
KeyringMode=private
LockPersonality=yes
MemoryDenyWriteExecute=yes
NotifyAccess=main
PrivateMounts=no
PrivateNetwork=no
ProtectHostname=yes
RestrictNamespaces=yes
RestrictRealtime=yes
RestrictSUIDSGID=yes
SystemCallFilter=~@clock
SystemCallFilter=~@cpu-emulation
SystemCallFilter=~@debug
SystemCallFilter=~@module
SystemCallFilter=~@mount
SystemCallFilter=~@obsolete
SystemCallFilter=~@privileged
SystemCallFilter=~@raw-io
SystemCallFilter=~@reboot
SystemCallFilter=~@swap
[Install]
WantedBy=multi-user.target

41
dbus/data/io.gpiod1.conf Normal file
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<!-- SPDX-License-Identifier: CC-BY-SA-4.0.txt -->
<!-- SPDX-FileCopyrightText: 2022-2024 Bartosz Golaszewski <bartosz.golaszewski@linaro.org> -->
<!-- This configuration file specifies the required security policies
for the gpio-dbus daemon to work. -->
<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>
<!-- Everyone can list GPIO devices and see their properties. -->
<policy context="default">
<allow send_destination="io.gpiod1"
send_interface="org.freedesktop.DBus.Peer"
send_member="Ping"/>
<allow send_destination="io.gpiod1"
send_interface="org.freedesktop.DBus.Introspectable"/>
<allow send_destination="io.gpiod1"
send_interface="org.freedesktop.DBus.Properties"/>
<allow send_destination="io.gpiod1"
send_interface="org.freedesktop.DBus.ObjectManager"/>
</policy>
<!-- Daemon must run as the `gpio-manager` user. -->
<policy user="gpio-manager">
<allow own="io.gpiod1"/>
</policy>
<!-- Members of the `gpio` group can request and manipulate GPIO lines. -->
<policy group="gpio">
<allow send_destination="io.gpiod1"/>
</policy>
<!-- Root can do anything. -->
<policy user="root">
<allow own="io.gpiod1"/>
<allow send_destination="io.gpiod1"/>
</policy>
</busconfig>

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dbus/lib/Makefile.am Normal file
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# SPDX-License-Identifier: GPL-2.0-or-later
# SPDX-FileCopyrightText: 2022-2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
libgpiodbus_la_CFLAGS = -include $(top_builddir)/config.h -Wall -Wextra -g
libgpiodbus_la_CFLAGS += $(GLIB_CFLAGS) $(GIO_CFLAGS)
libgpiodbus_la_CFLAGS += -DG_LOG_DOMAIN=\"gpiodbus\"
libgpiodbus_la_LDFLAGS = -version-info 1
generated-gpiodbus.h generated-gpiodbus.c: io.gpiod1.xml
$(AM_V_GEN)gdbus-codegen \
--interface-prefix io.gpiod1 \
--c-namespace Gpiodbus \
--generate-c-code generated-gpiodbus \
--c-generate-object-manager \
--c-generate-autocleanup=all \
--glib-min-required 2.74.0 \
$(srcdir)/io.gpiod1.xml
lib_LTLIBRARIES = libgpiodbus.la
include_HEADERS = \
generated-gpiodbus.h \
gpiodbus.h
libgpiodbus_la_SOURCES = generated-gpiodbus.c
BUILT_SOURCES = generated-gpiodbus.c generated-gpiodbus.h
CLEANFILES = $(BUILT_SOURCES)
dbusdir = $(datadir)/dbus-1/interfaces
dbus_DATA = io.gpiod1.xml

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dbus/lib/gpiodbus.h Normal file
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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* SPDX-FileCopyrightText: 2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org> */
#ifndef __GPIODBUS_H__
#define __GPIODBUS_H__
#include "generated-gpiodbus.h"
#endif /* __GPIODBUS_H__ */

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dbus/lib/io.gpiod1.xml Normal file
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<!-- SPDX-License-Identifier: CC-BY-SA-4.0 -->
<!-- SPDX-FileCopyrightText: 2022-2024 Bartosz Golaszewski <bartosz.golaszewski@linaro.org> -->
<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
<node>
<!--
io.gpiod1.Chip:
@short_description: Represents a single GPIO chip in the system.
-->
<interface name='io.gpiod1.Chip'>
<!--
Name:
Name of the chip as represented in the kernel.
-->
<property name='Name' type='s' access='read'/>
<!--
Label:
Label of the chip as represented in the kernel.
-->
<property name='Label' type='s' access='read'/>
<!--
NumLines:
Number of GPIO lines exposed by this chip.
-->
<property name='NumLines' type='u' access='read'/>
<!--
Path:
Filesystem path used to open this chip.
-->
<property name='Path' type='ay' access='read'/>
<!--
RequestLines:
@line_config: Line configuration. See below for details.
@request_config: Request configuration. See below for details.
@request_path: Object path pointing to the newly added request.
Requests a set of lines and makes it possible for the users of this API
to manipulate them depending on the line configuration.
Line configuration is a tuple of two arrays. The first one contains
mappings of arrays of line offsets to sets of line settings. The second
contains the list of default output values which are only used in output
mode.
Available line config options:
"direction" => String representing the line direction. Accepts the
following values: "input", "output".
"edge" => String representing the edge detection setting. Accepts the
following values: "falling", "rising", "both".
"active-low" => Boolean representing the active-low setting.
"drive" => String representing the drive settings. Accepts the
following values: "push-pull", "open-drain", "open-source".
"bias" => String representing the internal bias settings. Accepts the
following values: "disabled", "pull-up", "pull-down", "as-is".
"debounce-period" => Debounce period in microseconds represented as a
signed, 64-bit integer.
"event-clock" => String representing the clock used to timestamp edge
events. Accepts the following values: "monotonic",
"realtime", "hte".
Output values are applied to the lines in the order they appear in the
settings mappings.
Example variant that allows to request lines at offsets 1, 5 and 11 in
output, push-pull and active-low modes and specifies the output values
as active (as visualized with g_variant_print()):
// Line config tuple
(
// Array of line settings mappings
[
// Single mapping tuple
(
// Offsets to map
[1, 5, 11],
// Line settings dict
{
'direction': <'output'>,
'drive': <'push-pull'>,
'active-low': <true>
}
)
],
// Output values
[1, 1, 1]
)
Request configuration is a hashmap mapping names of the available config
options to their values wrapped in a variant.
Available request config options:
"consumer" => Consumer name as a string
"event-buffer-size" => Requested size of the in-kernel edge event
buffer as an unsigned 32-bit integer.
The object path to the new request is returned on success. The user
should wait for it to appear before trying to use the requested lines in
any way.
-->
<method name='RequestLines'>
<arg name='line_config' direction='in' type='(a(aua{sv})ai)'/>
<arg name='request_config' direction='in' type='a{sv}'/>
<arg name='request_path' direction='out' type='o'/>
</method>
</interface>
<!--
io.gpiod1.Line:
@short_description: Represents a single GPIO line on a chip.
-->
<interface name='io.gpiod1.Line'>
<!--
Offset:
Uniquely identifies the line on the chip.
-->
<property name='Offset' type='u' access='read'/>
<!--
Name:
Name of the GPIO line as represented in the kernel.
-->
<property name='Name' type='s' access='read'/>
<!--
Used:
True if line is busy.
Line can be used by gpio-manager, another user-space process, a kernel
driver or is hogged. The exact reason a line is busy cannot be determined
from user-space unless it's known to be managed by gpio-manager (see:
the Managed property of this interface).
-->
<property name='Used' type='b' access='read'/>
<!--
Consumer:
Name of the consumer of the line.
-->
<property name='Consumer' type='s' access='read'/>
<!--
Direction:
Direction of the line. Returns "input" or "output".
-->
<property name='Direction' type='s' access='read'/>
<!--
EdgeDetection:
Edge detection settings of the line. Returns: "none", "falling",
"rising" or "both".
-->
<property name='EdgeDetection' type='s' access='read'/>
<!--
Bias:
Bias setting of the line. Returns: "unknown", "disabled, "pull-up" or
"pull-down".
-->
<property name='Bias' type='s' access='read'/>
<!--
Drive:
Drive setting of the line. Returns "push-pull", "open-source" or
"open-drain".
-->
<property name='Drive' type='s' access='read'/>
<!--
ActiveLow:
True if the line is active-low. False for active-high.
-->
<property name='ActiveLow' type='b' access='read'/>
<!--
Debounced:
True if line is being debounced on interrupts. Can only be true with
edge-detection enabled.
-->
<property name='Debounced' type='b' access='read'/>
<!--
DebouncePeriodUs:
Debounce period in microseconds. 0 if the line is not debounced. Can
only be non-zero with edge-detection enabled.
-->
<property name='DebouncePeriodUs' type='t' access='read'/>
<!--
EventClock:
System clock used to timestamp edge events on this line. Returns:
"monotonic", "realtime", "hte" or "unknown". New types may be added in
the future. Clients should interpret other types they don't recognize as
"unknown".
-->
<property name='EventClock' type='s' access='read'/>
<!--
Managed:
True if the line is managed by gpio-manager.
-->
<property name='Managed' type='b' access='read'/>
<!--
RequestPath:
If this line is managed by gpio-manager then this property will contain
the DBus object path pointing to the managing request object.
-->
<property name='RequestPath' type='o' access='read'/>
<!--
EdgeEvent:
@event_data: Contains the edge (1 for rising, 0 for falling), timestamp
in nanoseconds and the global & line-local sequence numbers.
If the line is managed by the gpio-manager and is requested with edge
detection enabled then this signal will be emitted for every edge event
registered on this line.
D-Bus EdgeEvent signals are designed for low-to-medium frequency
interrupts. If you performance better than the order of tens of HZ, you
should probably access the line directly using the kernel uAPI.
-->
<signal name='EdgeEvent'>
<arg name='event_data' type='(ittt)'/>
</signal>
</interface>
<!--
io.gpiod1.Request:
@short_description: Represents a set of requested GPIO lines.
-->
<interface name='io.gpiod1.Request'>
<!--
ChipPath:
DBus object path pointing to the chip exposing the lines held by this
request.
-->
<property name='ChipPath' type='o' access='read'/>
<!--
LinePaths:
Array of DBus object paths pointing to the lines held by this request.
-->
<property name='LinePaths' type='ao' access='read'/>
<!--
Release:
Release the requested lines. After this method returns, the request
object on which it was called will be destroyed.
-->
<method name='Release'/>
<!--
ReconfigureLines:
@line_config: Line configuration. Refer to the RequestLines method of
the io.gpiod1.Chip interface for details.
Change the configuration of lines held by this request object without
releasing them.
-->
<method name='ReconfigureLines'>
<arg name='line_config' direction='in' type='(a(aua{sv})ai)'/>
</method>
<!--
GetValues:
@offsets: Array of line offsets within the request to read values for.
@values: Array of values in the order lines were specified in @offsets.
Read the values for a set of lines held by the request.
-->
<method name='GetValues'>
<arg name='offsets' direction='in' type='au'/>
<arg name='values' direction='out' type='ai'/>
</method>
<!--
SetValues:
@values: Array of mappings from line offsets to desired output values.
Set the values for a set of lines held by the request.
-->
<method name='SetValues'>
<arg name='values' direction='in' type='a{ui}'/>
</method>
</interface>
</node>

4
dbus/manager/.gitignore vendored Normal file
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# SPDX-License-Identifier: CC0-1.0
# SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
gpio-manager

21
dbus/manager/Makefile.am Normal file
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# SPDX-License-Identifier: GPL-2.0-or-later
# SPDX-FileCopyrightText: 2022-2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
AM_CFLAGS = -I$(top_srcdir)/bindings/glib/ -include $(top_builddir)/config.h
AM_CFLAGS += -Wall -Wextra -g
AM_CFLAGS += -I$(top_builddir)/dbus/lib/ -I$(top_srcdir)/dbus/lib/
AM_CFLAGS += $(GLIB_CFLAGS) $(GIO_CFLAGS) $(GIO_UNIX_CFLAGS) $(GUDEV_CFLAGS)
AM_CFLAGS += -DG_LOG_DOMAIN=\"gpio-manager\"
AM_CFLAGS += $(PROFILING_CFLAGS)
AM_LDFLAGS = $(GLIB_LIBS) $(GIO_LIBS) $(GIO_UNIX_LIBS) $(GUDEV_LIBS)
AM_LDFLAGS += $(PROFILING_LDFLAGS)
LDADD = $(top_builddir)/bindings/glib/libgpiod-glib.la
LDADD += $(top_builddir)/dbus/lib/libgpiodbus.la
bin_PROGRAMS = gpio-manager
gpio_manager_SOURCES = \
daemon.c \
daemon.h \
helpers.c \
helpers.h \
gpio-manager.c

821
dbus/manager/daemon.c Normal file
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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2022-2024 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <gpiod-glib.h>
#include <gpiodbus.h>
#include <gudev/gudev.h>
#include "daemon.h"
#include "helpers.h"
struct _GpiodbusDaemon {
GObject parent;
GDBusConnection *con;
GUdevClient *udev;
GDBusObjectManagerServer *chip_manager;
GDBusObjectManagerServer *request_manager;
GHashTable *chips;
GHashTable *requests;
GTree *req_id_root;
};
G_DEFINE_TYPE(GpiodbusDaemon, gpiodbus_daemon, G_TYPE_OBJECT);
typedef struct {
GpiodglibChip *chip;
GpiodbusChip *dbus_chip;
GpiodbusDaemon *daemon;
GDBusObjectManagerServer *line_manager;
GHashTable *lines;
} GpiodbusDaemonChipData;
typedef struct {
GpiodglibLineRequest *request;
GpiodbusRequest *dbus_request;
gint id;
GpiodbusDaemonChipData *chip_data;
} GpiodbusDaemonRequestData;
typedef struct {
GpiodbusLine *dbus_line;
GpiodbusDaemonChipData *chip_data;
GpiodbusDaemonRequestData *req_data;
} GpiodbusDaemonLineData;
static const gchar *const gpiodbus_daemon_udev_subsystems[] = { "gpio", NULL };
static void gpiodbus_daemon_dispose(GObject *obj)
{
GpiodbusDaemon *self = GPIODBUS_DAEMON(obj);
g_debug("disposing of the GPIO daemon");
g_clear_pointer(&self->chips, g_hash_table_unref);
/*
* REVISIT: Do we even need to unref the request hash table here at
* all? All requests should have been freed when removing their parent
* chips.
*/
g_clear_pointer(&self->requests, g_hash_table_unref);
g_clear_pointer(&self->req_id_root, g_tree_destroy);
g_clear_object(&self->con);
G_OBJECT_CLASS(gpiodbus_daemon_parent_class)->dispose(obj);
}
static void gpiodbus_daemon_finalize(GObject *obj)
{
GpiodbusDaemon *self = GPIODBUS_DAEMON(obj);
g_debug("finalizing GPIO daemon");
g_clear_object(&self->request_manager);
g_clear_object(&self->chip_manager);
g_clear_object(&self->udev);
G_OBJECT_CLASS(gpiodbus_daemon_parent_class)->finalize(obj);
}
static void gpiodbus_daemon_class_init(GpiodbusDaemonClass *daemon_class)
{
GObjectClass *class = G_OBJECT_CLASS(daemon_class);
class->dispose = gpiodbus_daemon_dispose;
class->finalize = gpiodbus_daemon_finalize;
}
static gboolean
gpiodbus_remove_request_if_chip_matches(gpointer key G_GNUC_UNUSED,
gpointer value, gpointer user_data)
{
GpiodbusDaemonChipData *chip_data = user_data;
GpiodbusDaemonRequestData *req_data = value;
return req_data->chip_data == chip_data;
}
static void gpiodbus_daemon_chip_data_free(gpointer data)
{
GpiodbusDaemonChipData *chip_data = data;
const gchar *obj_path;
obj_path = g_dbus_interface_skeleton_get_object_path(
G_DBUS_INTERFACE_SKELETON(chip_data->dbus_chip));
g_debug("unexporting object for GPIO chip: '%s'", obj_path);
g_hash_table_foreach_remove(chip_data->daemon->requests,
gpiodbus_remove_request_if_chip_matches,
chip_data);
g_dbus_object_manager_server_unexport(chip_data->daemon->chip_manager,
obj_path);
g_hash_table_unref(chip_data->lines);
g_object_unref(chip_data->line_manager);
g_object_unref(chip_data->chip);
g_object_unref(chip_data->dbus_chip);
g_free(chip_data);
}
static void gpiodbus_daemon_line_data_free(gpointer data)
{
GpiodbusDaemonLineData *line_data = data;
const gchar *obj_path;
obj_path = g_dbus_interface_skeleton_get_object_path(
G_DBUS_INTERFACE_SKELETON(line_data->dbus_line));
g_debug("unexporting object for GPIO line: '%s'",
obj_path);
g_dbus_object_manager_server_unexport(
line_data->chip_data->line_manager, obj_path);
g_object_unref(line_data->dbus_line);
g_free(line_data);
}
static void gpiodbus_lines_set_managed(GpiodbusDaemonRequestData *req_data,
gboolean managed)
{
g_autoptr(GDBusObject) obj = NULL;
const gchar *const *line_paths;
GpiodbusLine *line;
const gchar *path;
guint i;
line_paths = gpiodbus_request_get_line_paths(req_data->dbus_request);
for (path = line_paths[0], i = 0; path; path = line_paths[++i]) {
obj = g_dbus_object_manager_get_object(
G_DBUS_OBJECT_MANAGER(
req_data->chip_data->line_manager), path);
line = gpiodbus_object_peek_line(GPIODBUS_OBJECT(obj));
g_debug("Setting line %u on chip object '%s' to '%s'",
gpiodbus_line_get_offset(line),
g_dbus_interface_skeleton_get_object_path(
G_DBUS_INTERFACE_SKELETON(
req_data->chip_data->dbus_chip)),
managed ? "managed" : "unmanaged");
gpiodbus_line_set_managed(line, managed);
gpiodbus_line_set_request_path(line,
managed ? g_dbus_interface_skeleton_get_object_path(
G_DBUS_INTERFACE_SKELETON(
req_data->dbus_request)) : NULL);
g_dbus_interface_skeleton_flush(
G_DBUS_INTERFACE_SKELETON(line));
}
}
static void gpiodbus_daemon_request_data_free(gpointer data)
{
GpiodbusDaemonRequestData *req_data = data;
const gchar *obj_path;
obj_path = g_dbus_interface_skeleton_get_object_path(
G_DBUS_INTERFACE_SKELETON(req_data->dbus_request));
g_debug("unexporting object for GPIO request: '%s'", obj_path);
g_dbus_object_manager_server_unexport(
req_data->chip_data->daemon->request_manager, obj_path);
gpiodbus_lines_set_managed(req_data, FALSE);
gpiodbus_id_free(req_data->chip_data->daemon->req_id_root,
req_data->id);
g_object_unref(req_data->request);
g_object_unref(req_data->dbus_request);
g_free(req_data);
}
static void gpiodbus_daemon_init(GpiodbusDaemon *self)
{
g_debug("initializing GPIO D-Bus daemon");
self->con = NULL;
self->udev = g_udev_client_new(gpiodbus_daemon_udev_subsystems);
self->chip_manager =
g_dbus_object_manager_server_new("/io/gpiod1/chips");
self->request_manager =
g_dbus_object_manager_server_new("/io/gpiod1/requests");
self->chips = g_hash_table_new_full(g_str_hash, g_str_equal, g_free,
gpiodbus_daemon_chip_data_free);
self->requests = g_hash_table_new_full(g_str_hash, g_str_equal, g_free,
gpiodbus_daemon_request_data_free);
self->req_id_root = g_tree_new_full(gpiodbus_id_cmp, NULL,
g_free, NULL);
}
GpiodbusDaemon *gpiodbus_daemon_new(void)
{
return GPIODBUS_DAEMON(g_object_new(GPIODBUS_DAEMON_TYPE, NULL));
}
static void gpiodbus_daemon_on_info_event(GpiodglibChip *chip G_GNUC_UNUSED,
GpiodglibInfoEvent *event,
gpointer data)
{
GpiodbusDaemonChipData *chip_data = data;
g_autoptr(GpiodglibLineInfo) info = NULL;
GpiodbusDaemonLineData *line_data;
guint offset;
info = gpiodglib_info_event_get_line_info(event);
offset = gpiodglib_line_info_get_offset(info);
g_debug("line info event received for offset %u on chip '%s'",
offset,
g_dbus_interface_skeleton_get_object_path(
G_DBUS_INTERFACE_SKELETON(chip_data->dbus_chip)));
line_data = g_hash_table_lookup(chip_data->lines,
GINT_TO_POINTER(offset));
if (!line_data)
g_error("failed to retrieve line data - programming bug?");
gpiodbus_line_set_props(line_data->dbus_line, info);
}
static void gpiodbus_daemon_export_line(GpiodbusDaemon *self,
GpiodbusDaemonChipData *chip_data,
GpiodglibLineInfo *info)
{
g_autofree GpiodbusDaemonLineData *line_data = NULL;
g_autoptr(GpiodbusObjectSkeleton) skeleton = NULL;
g_autoptr(GpiodbusLine) dbus_line = NULL;
g_autofree gchar *obj_path = NULL;
const gchar *obj_prefix;
guint line_offset;
gboolean ret;
obj_prefix = g_dbus_object_manager_get_object_path(
G_DBUS_OBJECT_MANAGER(chip_data->line_manager));
line_offset = gpiodglib_line_info_get_offset(info);
dbus_line = gpiodbus_line_skeleton_new();
obj_path = g_strdup_printf("%s/line%u", obj_prefix, line_offset);
gpiodbus_line_set_props(dbus_line, info);
skeleton = gpiodbus_object_skeleton_new(obj_path);
gpiodbus_object_skeleton_set_line(skeleton, GPIODBUS_LINE(dbus_line));
g_debug("exporting object for GPIO line: '%s'", obj_path);
g_dbus_object_manager_server_export(chip_data->line_manager,
G_DBUS_OBJECT_SKELETON(skeleton));
g_dbus_object_manager_server_set_connection(chip_data->line_manager,
self->con);
line_data = g_malloc0(sizeof(*line_data));
line_data->dbus_line = g_steal_pointer(&dbus_line);
line_data->chip_data = chip_data;
ret = g_hash_table_insert(chip_data->lines,
GUINT_TO_POINTER(line_offset),
g_steal_pointer(&line_data));
/* It's a programming bug if the line is already in the hashmap. */
g_assert(ret);
}
static gboolean gpiodbus_daemon_export_lines(GpiodbusDaemon *self,
GpiodbusDaemonChipData *chip_data)
{
g_autoptr(GpiodglibChipInfo) chip_info = NULL;
GpiodglibChip *chip = chip_data->chip;
g_autoptr(GError) err = NULL;
guint i, num_lines;
gint j;
chip_info = gpiodglib_chip_get_info(chip, &err);
if (!chip_info) {
g_critical("failed to read chip info: %s", err->message);
return FALSE;
}
num_lines = gpiodglib_chip_info_get_num_lines(chip_info);
g_signal_connect(chip, "info-event",
G_CALLBACK(gpiodbus_daemon_on_info_event), chip_data);
for (i = 0; i < num_lines; i++) {
g_autoptr(GpiodglibLineInfo) linfo = NULL;
linfo = gpiodglib_chip_watch_line_info(chip, i, &err);
if (!linfo) {
g_critical("failed to setup a line-info watch: %s",
err->message);
for (j = i; j >= 0; j--)
gpiodglib_chip_unwatch_line_info(chip, i, NULL);
return FALSE;
}
gpiodbus_daemon_export_line(self, chip_data, linfo);
}
return TRUE;
}
static gboolean
gpiodbus_daemon_handle_release_lines(GpiodbusRequest *request,
GDBusMethodInvocation *invocation,
gpointer user_data)
{
GpiodbusDaemonRequestData *req_data = user_data;
g_autofree gchar *obj_path = NULL;
gboolean ret;
obj_path = g_strdup(g_dbus_interface_skeleton_get_object_path(
G_DBUS_INTERFACE_SKELETON(request)));
g_debug("release call received on request '%s'", obj_path);
ret = g_hash_table_remove(req_data->chip_data->daemon->requests,
obj_path);
/* It's a programming bug if the request was not in the hashmap. */
if (!ret)
g_warning("request '%s' is not registered - logic error?",
obj_path);
g_dbus_method_invocation_return_value(invocation, NULL);
return G_SOURCE_CONTINUE;
}
static gboolean
gpiodbus_daemon_handle_reconfigure_lines(GpiodbusRequest *request,
GDBusMethodInvocation *invocation,
GVariant *arg_line_cfg,
gpointer user_data)
{
GpiodbusDaemonRequestData *req_data = user_data;
g_autoptr(GpiodglibLineConfig) line_cfg = NULL;
g_autofree gchar *line_cfg_str = NULL;
g_autoptr(GError) err = NULL;
const gchar *obj_path;
gboolean ret;
obj_path = g_dbus_interface_skeleton_get_object_path(
G_DBUS_INTERFACE_SKELETON(request));
line_cfg_str = g_variant_print(arg_line_cfg, FALSE);
g_debug("reconfigure call received on request '%s', line config: %s",
obj_path, line_cfg_str);
line_cfg = gpiodbus_line_config_from_variant(arg_line_cfg);
if (!line_cfg) {
g_critical("failed to convert method call arguments '%s' to line config",
line_cfg_str);
g_dbus_method_invocation_return_error(invocation, G_DBUS_ERROR,
G_DBUS_ERROR_INVALID_ARGS,
"Invalid line configuration");
goto out;
}
ret = gpiodglib_line_request_reconfigure_lines(req_data->request,
line_cfg, &err);
if (!ret) {
g_critical("failed to reconfigure GPIO lines on request '%s': %s",
obj_path, err->message);
g_dbus_method_invocation_return_dbus_error(invocation,
"io.gpiod1.ReconfigureFailed",
err->message);
goto out;
}
g_dbus_method_invocation_return_value(invocation, NULL);
out:
return G_SOURCE_CONTINUE;
}
static gboolean
gpiodbus_daemon_handle_get_values(GpiodbusRequest *request,
GDBusMethodInvocation *invocation,
GVariant *arg_offsets, gpointer user_data)
{
GpiodbusDaemonRequestData *req_data = user_data;
g_autoptr(GVariant) out_values = NULL;
g_autofree gchar *offsets_str = NULL;
g_autoptr(GVariant) response = NULL;
g_autoptr(GArray) offsets = NULL;
g_autoptr(GArray) values = NULL;
g_autoptr(GError) err = NULL;
GVariantBuilder builder;
const gchar *obj_path;
GVariantIter iter;
gsize num_offsets;
guint offset, i;
gboolean ret;
obj_path = g_dbus_interface_skeleton_get_object_path(
G_DBUS_INTERFACE_SKELETON(request));
offsets_str = g_variant_print(arg_offsets, FALSE);
num_offsets = g_variant_n_children(arg_offsets);
g_debug("get-values call received on request '%s' for offsets: %s",
obj_path, offsets_str);
if (num_offsets == 0) {
ret = gpiodglib_line_request_get_values(req_data->request,
&values, &err);
} else {
offsets = g_array_sized_new(FALSE, TRUE, sizeof(offset),
num_offsets);
g_variant_iter_init(&iter, arg_offsets);
while (g_variant_iter_next(&iter, "u", &offset))
g_array_append_val(offsets, offset);
ret = gpiodglib_line_request_get_values_subset(
req_data->request, offsets, &values, &err);
}
if (!ret) {
g_critical("failed to get GPIO line values on request '%s': %s",
obj_path, err->message);
g_dbus_method_invocation_return_dbus_error(invocation,
"io.gpiod1.GetValuesFailed",
err->message);
goto out;
}
g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
for (i = 0; i < values->len; i++)
g_variant_builder_add(&builder, "i",
g_array_index(values, gint, i));
out_values = g_variant_ref_sink(g_variant_builder_end(&builder));
g_variant_builder_init(&builder, G_VARIANT_TYPE_TUPLE);
g_variant_builder_add_value(&builder, out_values);
response = g_variant_ref_sink(g_variant_builder_end(&builder));
g_dbus_method_invocation_return_value(invocation, response);
out:
return G_SOURCE_CONTINUE;
}
static gboolean
gpiodbus_daemon_handle_set_values(GpiodbusRequest *request,
GDBusMethodInvocation *invocation,
GVariant *arg_values, gpointer user_data)
{
GpiodbusDaemonRequestData *req_data = user_data;
g_autofree gchar *values_str = NULL;
g_autoptr(GArray) offsets = NULL;
g_autoptr(GArray) values = NULL;
g_autoptr(GError) err = NULL;
const gchar *obj_path;
GVariantIter iter;
gsize num_values;
guint offset;
gboolean ret;
gint value;
obj_path = g_dbus_interface_skeleton_get_object_path(
G_DBUS_INTERFACE_SKELETON(request));
values_str = g_variant_print(arg_values, FALSE);
num_values = g_variant_n_children(arg_values);
g_debug("set-values call received on request '%s': %s",
obj_path, values_str);
if (num_values == 0) {
g_critical("Client passed no offset to value mappings");
g_dbus_method_invocation_return_error(invocation, G_DBUS_ERROR,
G_DBUS_ERROR_INVALID_ARGS,
"No offset <-> value mappings specified");
goto out;
}
offsets = g_array_sized_new(FALSE, TRUE, sizeof(offset), num_values);
values = g_array_sized_new(FALSE, TRUE, sizeof(value), num_values);
g_variant_iter_init(&iter, arg_values);
while (g_variant_iter_next(&iter, "{ui}", &offset, &value)) {
g_array_append_val(offsets, offset);
g_array_append_val(values, value);
}
ret = gpiodglib_line_request_set_values_subset(req_data->request,
offsets, values, &err);
if (!ret) {
g_critical("failed to set GPIO line values on request '%s': %s",
obj_path, err->message);
g_dbus_method_invocation_return_dbus_error(invocation,
"io.gpiod1.SetValuesFailed",
err->message);
goto out;
}
g_dbus_method_invocation_return_value(invocation, NULL);
out:
return G_SOURCE_CONTINUE;
}
static void
gpiodbus_daemon_on_edge_event(GpiodglibLineRequest *request G_GNUC_UNUSED,
GpiodglibEdgeEvent *event, gpointer user_data)
{
GpiodbusDaemonRequestData *req_data = user_data;
GpiodbusDaemonLineData *line_data;
gulong line_seqno, global_seqno;
GpiodglibEdgeEventType edge;
guint64 timestamp;
guint offset;
gint val;
edge = gpiodglib_edge_event_get_event_type(event);
offset = gpiodglib_edge_event_get_line_offset(event);
timestamp = gpiodglib_edge_event_get_timestamp_ns(event);
global_seqno = gpiodglib_edge_event_get_global_seqno(event);
line_seqno = gpiodglib_edge_event_get_line_seqno(event);
val = edge == GPIODGLIB_EDGE_EVENT_RISING_EDGE ? 1 : 0;
g_debug("%s edge event received for offset %u on request '%s'",
val ? "rising" : "falling", offset,
g_dbus_interface_skeleton_get_object_path(
G_DBUS_INTERFACE_SKELETON(req_data->dbus_request)));
line_data = g_hash_table_lookup(req_data->chip_data->lines,
GINT_TO_POINTER(offset));
if (!line_data)
g_error("failed to retrieve line data - programming bug?");
gpiodbus_line_emit_edge_event(line_data->dbus_line,
g_variant_new("(ittt)", val, timestamp,
global_seqno, line_seqno));
}
static void
gpiodbus_daemon_export_request(GpiodbusDaemon *self,
GpiodglibLineRequest *request,
GpiodbusDaemonChipData *chip_data, gint id)
{
g_autofree GpiodbusDaemonRequestData *req_data = NULL;
g_autoptr(GpiodbusObjectSkeleton) skeleton = NULL;
g_autoptr(GpiodbusRequest) dbus_req = NULL;
g_autofree gchar *obj_path = NULL;
gboolean ret;
dbus_req = gpiodbus_request_skeleton_new();
obj_path = g_strdup_printf("/io/gpiod1/requests/request%d", id);
gpiodbus_request_set_props(dbus_req, request, chip_data->dbus_chip,
G_DBUS_OBJECT_MANAGER(chip_data->line_manager));
skeleton = gpiodbus_object_skeleton_new(obj_path);
gpiodbus_object_skeleton_set_request(skeleton,
GPIODBUS_REQUEST(dbus_req));
g_debug("exporting object for GPIO request: '%s'", obj_path);
g_dbus_object_manager_server_export(self->request_manager,
G_DBUS_OBJECT_SKELETON(skeleton));
req_data = g_malloc0(sizeof(*req_data));
req_data->chip_data = chip_data;
req_data->dbus_request = g_steal_pointer(&dbus_req);
req_data->id = id;
req_data->request = g_object_ref(request);
g_signal_connect(req_data->dbus_request, "handle-release",
G_CALLBACK(gpiodbus_daemon_handle_release_lines),
req_data);
g_signal_connect(req_data->dbus_request, "handle-reconfigure-lines",
G_CALLBACK(gpiodbus_daemon_handle_reconfigure_lines),
req_data);
g_signal_connect(req_data->dbus_request, "handle-get-values",
G_CALLBACK(gpiodbus_daemon_handle_get_values),
req_data);
g_signal_connect(req_data->dbus_request, "handle-set-values",
G_CALLBACK(gpiodbus_daemon_handle_set_values),
req_data);
g_signal_connect(req_data->request, "edge-event",
G_CALLBACK(gpiodbus_daemon_on_edge_event), req_data);
gpiodbus_lines_set_managed(req_data, TRUE);
ret = g_hash_table_insert(self->requests, g_steal_pointer(&obj_path),
g_steal_pointer(&req_data));
/* It's a programming bug if the request is already in the hashmap. */
g_assert(ret);
}
static gboolean
gpiodbus_daemon_handle_request_lines(GpiodbusChip *chip,
GDBusMethodInvocation *invocation,
GVariant *arg_line_cfg,
GVariant *arg_req_cfg,
gpointer user_data)
{
GpiodbusDaemonChipData *chip_data = user_data;
g_autoptr(GpiodglibRequestConfig) req_cfg = NULL;
g_autoptr(GpiodglibLineRequest) request = NULL;
g_autoptr(GpiodglibLineConfig) line_cfg = NULL;
g_autofree gchar *line_cfg_str = NULL;
g_autofree gchar *req_cfg_str = NULL;
g_autofree gchar *response = NULL;
g_autoptr(GError) err = NULL;
const gchar *obj_path;
guint id;
obj_path = g_dbus_interface_skeleton_get_object_path(
G_DBUS_INTERFACE_SKELETON(chip));
line_cfg_str = g_variant_print(arg_line_cfg, FALSE);
req_cfg_str = g_variant_print(arg_req_cfg, FALSE);
g_debug("line request received on chip '%s', line config: %s, request_config: %s",
obj_path, line_cfg_str, req_cfg_str);
line_cfg = gpiodbus_line_config_from_variant(arg_line_cfg);
if (!line_cfg) {
g_critical("failed to convert method call arguments '%s' to line config",
line_cfg_str);
g_dbus_method_invocation_return_error(invocation, G_DBUS_ERROR,
G_DBUS_ERROR_INVALID_ARGS,
"Invalid line configuration");
goto out;
}
req_cfg = gpiodbus_request_config_from_variant(arg_req_cfg);
if (!req_cfg) {
g_critical("failed to convert method call arguments '%s' to request config",
req_cfg_str);
g_dbus_method_invocation_return_error(invocation, G_DBUS_ERROR,
G_DBUS_ERROR_INVALID_ARGS,
"Invalid request configuration");
goto out;
}
request = gpiodglib_chip_request_lines(chip_data->chip, req_cfg,
line_cfg, &err);
if (err) {
g_critical("failed to request GPIO lines on chip '%s': %s",
obj_path, err->message);
g_dbus_method_invocation_return_dbus_error(invocation,
"io.gpiod1.RequestFailed", err->message);
goto out;
}
g_debug("line request succeeded on chip '%s'", obj_path);
id = gpiodbus_id_alloc(chip_data->daemon->req_id_root);
gpiodbus_daemon_export_request(chip_data->daemon, request,
chip_data, id);
response = g_strdup_printf("/io/gpiod1/requests/request%d", id);
g_dbus_method_invocation_return_value(invocation,
g_variant_new("(o)", response));
out:
return G_SOURCE_CONTINUE;
}
static void gpiodbus_daemon_export_chip(GpiodbusDaemon *self, GUdevDevice *dev)
{
g_autofree GpiodbusDaemonChipData *chip_data = NULL;
g_autoptr(GDBusObjectManagerServer) manager = NULL;
g_autoptr(GpiodbusObjectSkeleton) skeleton = NULL;
const gchar *devname, *devpath, *obj_prefix;
g_autoptr(GpiodbusChip) dbus_chip = NULL;
g_autoptr(GpiodglibChip) chip = NULL;
g_autoptr(GHashTable) lines = NULL;
g_autofree gchar *obj_path = NULL;
g_autoptr(GError) err = NULL;
gboolean ret;
devname = g_udev_device_get_name(dev);
devpath = g_udev_device_get_device_file(dev);
obj_prefix = g_dbus_object_manager_get_object_path(
G_DBUS_OBJECT_MANAGER(self->chip_manager));
chip = gpiodglib_chip_new(devpath, &err);
if (!chip) {
g_critical("failed to open GPIO chip %s: %s",
devpath, err->message);
return;
}
dbus_chip = gpiodbus_chip_skeleton_new();
obj_path = g_strdup_printf("%s/%s", obj_prefix, devname);
ret = gpiodbus_chip_set_props(dbus_chip, chip, &err);
if (!ret) {
g_critical("failed to set chip properties: %s", err->message);
return;
}
skeleton = gpiodbus_object_skeleton_new(obj_path);
gpiodbus_object_skeleton_set_chip(skeleton, GPIODBUS_CHIP(dbus_chip));
g_debug("exporting object for GPIO chip: '%s'", obj_path);
g_dbus_object_manager_server_export(self->chip_manager,
G_DBUS_OBJECT_SKELETON(skeleton));
lines = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL,
gpiodbus_daemon_line_data_free);
manager = g_dbus_object_manager_server_new(obj_path);
chip_data = g_malloc0(sizeof(*chip_data));
chip_data->daemon = self;
chip_data->chip = g_steal_pointer(&chip);
chip_data->dbus_chip = g_steal_pointer(&dbus_chip);
chip_data->lines = g_steal_pointer(&lines);
chip_data->line_manager = g_steal_pointer(&manager);
ret = gpiodbus_daemon_export_lines(self, chip_data);
if (!ret) {
g_dbus_object_manager_server_unexport(self->chip_manager,
obj_path);
return;
}
g_signal_connect(chip_data->dbus_chip, "handle-request-lines",
G_CALLBACK(gpiodbus_daemon_handle_request_lines),
chip_data);
ret = g_hash_table_insert(self->chips, g_strdup(devname),
g_steal_pointer(&chip_data));
/* It's a programming bug if the chip is already in the hashmap. */
g_assert(ret);
}
static void gpiodbus_daemon_unexport_chip(GpiodbusDaemon *self,
GUdevDevice *dev)
{
const gchar *name = g_udev_device_get_name(dev);
gboolean ret;
ret = g_hash_table_remove(self->chips, name);
/* It's a programming bug if the chip was not in the hashmap. */
if (!ret)
g_warning("chip '%s' is not registered - exporting failed?",
name);
}
/*
* We can get two uevents per action per gpiochip. One is for the new-style
* character device, the other for legacy sysfs devices. We are only concerned
* with the former, which we can tell from the latter by the presence of
* the device file.
*/
static gboolean gpiodbus_daemon_is_gpiochip_device(GUdevDevice *dev)
{
return g_udev_device_get_device_file(dev) != NULL;
}
static void gpiodbus_daemon_on_uevent(GUdevClient *udev G_GNUC_UNUSED,
const gchar *action, GUdevDevice *dev,
gpointer data)
{
GpiodbusDaemon *self = data;
if (!gpiodbus_daemon_is_gpiochip_device(dev))
return;
g_debug("uevent: %s action on %s device",
action, g_udev_device_get_name(dev));
if (g_strcmp0(action, "bind") == 0)
gpiodbus_daemon_export_chip(self, dev);
else if (g_strcmp0(action, "unbind") == 0)
gpiodbus_daemon_unexport_chip(self, dev);
}
static void gpiodbus_daemon_process_chip_dev(gpointer data, gpointer user_data)
{
GpiodbusDaemon *daemon = user_data;
GUdevDevice *dev = data;
if (gpiodbus_daemon_is_gpiochip_device(dev))
gpiodbus_daemon_export_chip(daemon, dev);
}
void gpiodbus_daemon_start(GpiodbusDaemon *self, GDBusConnection *con)
{
g_autolist(GUdevDevice) devs = NULL;
g_assert(self);
g_assert(!self->con); /* Don't allow to call this twice. */
self->con = g_object_ref(con);
/* Subscribe for GPIO uevents. */
g_signal_connect(self->udev, "uevent",
G_CALLBACK(gpiodbus_daemon_on_uevent), self);
devs = g_udev_client_query_by_subsystem(self->udev, "gpio");
g_list_foreach(devs, gpiodbus_daemon_process_chip_dev, self);
g_dbus_object_manager_server_set_connection(self->chip_manager,
self->con);
g_dbus_object_manager_server_set_connection(self->request_manager,
self->con);
g_debug("GPIO daemon now listening");
}

22
dbus/manager/daemon.h Normal file
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@@ -0,0 +1,22 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/* SPDX-FileCopyrightText: 2022-2024 Bartosz Golaszewski <bartosz.golaszewski@linaro.org> */
#ifndef __GPIODBUS_DAEMON_H__
#define __GPIODBUS_DAEMON_H__
#include <gio/gio.h>
#include <glib.h>
#include <glib-object.h>
G_DECLARE_FINAL_TYPE(GpiodbusDaemon, gpiodbus_daemon,
GPIODBUS, DAEMON, GObject);
#define GPIODBUS_DAEMON_TYPE (gpiodbus_daemon_get_type())
#define GPIODBUS_DAEMON(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj), \
GPIODBUS_DAEMON_TYPE, GpiodbusDaemon))
GpiodbusDaemon *gpiodbus_daemon_new(void);
void gpiodbus_daemon_start(GpiodbusDaemon *daemon, GDBusConnection *con);
#endif /* __GPIODBUS_DAEMON_H__ */

173
dbus/manager/gpio-manager.c Normal file
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@@ -0,0 +1,173 @@
// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2022-2024 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <gio/gio.h>
#include <glib.h>
#include <glib-unix.h>
#include <gpiod-glib.h>
#include <stdlib.h>
#include "daemon.h"
static const gchar *const debug_domains[] = {
"gpio-manager",
"gpiodglib",
NULL
};
static gboolean stop_main_loop_on_sig(gpointer data, const gchar *signame)
{
GMainLoop *loop = data;
g_debug("%s received", signame);
g_main_loop_quit(loop);
return G_SOURCE_REMOVE;
}
static gboolean on_sigterm(gpointer data)
{
return stop_main_loop_on_sig(data, "SIGTERM");
}
static gboolean on_sigint(gpointer data)
{
return stop_main_loop_on_sig(data, "SIGINT");
}
static gboolean on_sighup(gpointer data G_GNUC_UNUSED)
{
g_debug("SIGHUB received, ignoring");
return G_SOURCE_CONTINUE;
}
static void on_bus_acquired(GDBusConnection *con,
const gchar *name G_GNUC_UNUSED,
gpointer data)
{
GpiodbusDaemon *daemon = data;
g_debug("D-Bus connection acquired");
gpiodbus_daemon_start(daemon, con);
}
static void on_name_acquired(GDBusConnection *con G_GNUC_UNUSED,
const gchar *name, gpointer data G_GNUC_UNUSED)
{
g_debug("D-Bus name acquired: '%s'", name);
}
static void on_name_lost(GDBusConnection *con,
const gchar *name, gpointer data G_GNUC_UNUSED)
{
g_debug("D-Bus name lost: '%s'", name);
if (!con)
g_error("unable to make connection to the bus");
if (g_dbus_connection_is_closed(con))
g_error("connection to the bus closed");
g_error("name '%s' lost on the bus", name);
}
static void print_version_and_exit(void)
{
g_print("%s (libgpiod) v%s\n", g_get_prgname(), gpiodglib_api_version());
exit(EXIT_SUCCESS);
}
static void parse_opts(int argc, char **argv)
{
gboolean ret, opt_debug = FALSE, opt_version = FALSE;
g_autoptr(GOptionContext) ctx = NULL;
g_auto(GStrv) remaining = NULL;
g_autoptr(GError) err = NULL;
const GOptionEntry opts[] = {
{
.long_name = "debug",
.short_name = 'd',
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_NONE,
.arg_data = &opt_debug,
.description = "Emit additional debug log messages.",
},
{
.long_name = "version",
.short_name = 'v',
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_NONE,
.arg_data = &opt_version,
.description = "Print version and exit.",
},
{
.long_name = G_OPTION_REMAINING,
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING_ARRAY,
.arg_data = &remaining,
},
{ }
};
ctx = g_option_context_new(NULL);
g_option_context_set_summary(ctx, "D-Bus daemon managing GPIOs.");
g_option_context_add_main_entries(ctx, opts, NULL);
ret = g_option_context_parse(ctx, &argc, &argv, &err);
if (!ret) {
g_printerr("Option parsing failed: %s\n\nUse %s --help\n",
err->message, g_get_prgname());
exit(EXIT_FAILURE);
}
if (remaining) {
g_printerr("Option parsing failed: additional arguments are not allowed\n");
exit(EXIT_FAILURE);
}
if (opt_version)
print_version_and_exit();
if (opt_debug)
g_log_writer_default_set_debug_domains(debug_domains);
}
int main(int argc, char **argv)
{
g_autoptr(GpiodbusDaemon) daemon = NULL;
g_autofree gchar *basename = NULL;
g_autoptr(GMainLoop) loop = NULL;
guint bus_id;
basename = g_path_get_basename(argv[0]);
g_set_prgname(basename);
parse_opts(argc, argv);
g_message("initializing %s", g_get_prgname());
loop = g_main_loop_new(NULL, FALSE);
daemon = gpiodbus_daemon_new();
g_unix_signal_add(SIGTERM, on_sigterm, loop);
g_unix_signal_add(SIGINT, on_sigint, loop);
g_unix_signal_add(SIGHUP, on_sighup, NULL); /* Ignore SIGHUP. */
bus_id = g_bus_own_name(G_BUS_TYPE_SYSTEM, "io.gpiod1",
G_BUS_NAME_OWNER_FLAGS_NONE, on_bus_acquired,
on_name_acquired, on_name_lost, daemon, NULL);
g_message("%s started", g_get_prgname());
g_main_loop_run(loop);
g_bus_unown_name(bus_id);
g_message("%s exiting", g_get_prgname());
return EXIT_SUCCESS;
}

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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2023-2024 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include "helpers.h"
gint gpiodbus_id_cmp(gconstpointer a, gconstpointer b,
gpointer user_data G_GNUC_UNUSED)
{
const gint *id_a = a;
const gint *id_b = b;
if (*id_a < *id_b)
return -1;
else if (*id_a > *id_b)
return 1;
return 0;
}
static gboolean find_lowest(gpointer key, gpointer value G_GNUC_UNUSED,
gpointer data)
{
gint *lowest = data, *curr = key;
if (*lowest == *curr)
(*lowest)++;
return FALSE;
}
gint gpiodbus_id_alloc(GTree *id_root)
{
gint lowest = 0, *key;
g_tree_foreach(id_root, find_lowest, &lowest);
key = g_malloc(sizeof(*key));
*key = lowest;
g_tree_insert(id_root, key, NULL);
return lowest;
}
void gpiodbus_id_free(GTree *id_root, gint id)
{
g_assert(g_tree_remove(id_root, &id));
}
gboolean
gpiodbus_chip_set_props(GpiodbusChip *skeleton, GpiodglibChip *chip,
GError **err)
{
g_autoptr(GpiodglibChipInfo) info = NULL;
g_autofree gchar *label = NULL;
g_autofree gchar *path = NULL;
g_autofree gchar *name = NULL;
info = gpiodglib_chip_get_info(chip, err);
if (!info)
return FALSE;
name = gpiodglib_chip_info_dup_name(info);
label = gpiodglib_chip_info_dup_label(info);
gpiodbus_chip_set_name(skeleton, name);
gpiodbus_chip_set_label(skeleton, label);
gpiodbus_chip_set_num_lines(skeleton,
gpiodglib_chip_info_get_num_lines(info));
path = gpiodglib_chip_dup_path(chip);
gpiodbus_chip_set_path(skeleton, path);
g_dbus_interface_skeleton_flush(G_DBUS_INTERFACE_SKELETON(skeleton));
return TRUE;
}
static const gchar *map_direction(GpiodglibLineDirection direction)
{
switch (direction) {
case GPIODGLIB_LINE_DIRECTION_INPUT:
return "input";
case GPIODGLIB_LINE_DIRECTION_OUTPUT:
return "output";
default:
g_error("invalid direction value returned by libgpiod-glib");
}
}
static const gchar *map_edge(GpiodglibLineEdge edge)
{
switch (edge) {
case GPIODGLIB_LINE_EDGE_NONE:
return "none";
case GPIODGLIB_LINE_EDGE_FALLING:
return "falling";
case GPIODGLIB_LINE_EDGE_RISING:
return "rising";
case GPIODGLIB_LINE_EDGE_BOTH:
return "both";
default:
g_error("invalid edge value returned by libgpiod-glib");
}
}
static const gchar *map_bias(GpiodglibLineBias bias)
{
switch (bias) {
case GPIODGLIB_LINE_BIAS_UNKNOWN:
return "unknown";
case GPIODGLIB_LINE_BIAS_DISABLED:
return "disabled";
case GPIODGLIB_LINE_BIAS_PULL_UP:
return "pull-up";
case GPIODGLIB_LINE_BIAS_PULL_DOWN:
return "pull-down";
default:
g_error("invalid bias value returned by libgpiod-glib");
}
}
static const gchar *map_drive(GpiodglibLineDrive drive)
{
switch (drive) {
case GPIODGLIB_LINE_DRIVE_PUSH_PULL:
return "push-pull";
case GPIODGLIB_LINE_DRIVE_OPEN_DRAIN:
return "open-drain";
case GPIODGLIB_LINE_DRIVE_OPEN_SOURCE:
return "open-source";
default:
g_error("invalid drive value returned by libgpiod-glib");
}
}
static const gchar *map_clock(GpiodglibLineClock event_clock)
{
switch (event_clock) {
case GPIODGLIB_LINE_CLOCK_MONOTONIC:
return "monotonic";
case GPIODGLIB_LINE_CLOCK_REALTIME:
return "realtime";
case GPIODGLIB_LINE_CLOCK_HTE:
return "hte";
default:
g_error("invalid event clock value returned by libgpiod-glib");
}
}
void gpiodbus_line_set_props(GpiodbusLine *skeleton, GpiodglibLineInfo *info)
{
g_autofree gchar *consumer = gpiodglib_line_info_dup_consumer(info);
g_autofree gchar *name = gpiodglib_line_info_dup_name(info);
gpiodbus_line_set_offset(skeleton,
gpiodglib_line_info_get_offset(info));
gpiodbus_line_set_name(skeleton, name);
gpiodbus_line_set_used(skeleton, gpiodglib_line_info_is_used(info));
gpiodbus_line_set_consumer(skeleton, consumer);
gpiodbus_line_set_direction(skeleton,
map_direction(gpiodglib_line_info_get_direction(info)));
gpiodbus_line_set_edge_detection(skeleton,
map_edge(gpiodglib_line_info_get_edge_detection(info)));
gpiodbus_line_set_bias(skeleton,
map_bias(gpiodglib_line_info_get_bias(info)));
gpiodbus_line_set_drive(skeleton,
map_drive(gpiodglib_line_info_get_drive(info)));
gpiodbus_line_set_active_low(skeleton,
gpiodglib_line_info_is_active_low(info));
gpiodbus_line_set_debounced(skeleton,
gpiodglib_line_info_is_debounced(info));
gpiodbus_line_set_debounce_period_us(skeleton,
gpiodglib_line_info_get_debounce_period_us(info));
gpiodbus_line_set_event_clock(skeleton,
map_clock(gpiodglib_line_info_get_event_clock(info)));
g_dbus_interface_skeleton_flush(G_DBUS_INTERFACE_SKELETON(skeleton));
}
static gint line_offset_cmp(gconstpointer a, gconstpointer b)
{
GpiodbusObject *line_obj = (GpiodbusObject *)a;
GpiodbusLine *line;
const guint *offset = b;
line = gpiodbus_object_peek_line(line_obj);
return gpiodbus_line_get_offset(line) != *offset;
}
void gpiodbus_request_set_props(GpiodbusRequest *skeleton,
GpiodglibLineRequest *request, GpiodbusChip *chip,
GDBusObjectManager *line_manager)
{
g_autolist(GpiodbusObject) line_objs = NULL;
g_autoptr(GStrvBuilder) builder = NULL;
g_autoptr(GArray) offsets = NULL;
g_auto(GStrv) paths = NULL;
GList *found;
guint i;
offsets = gpiodglib_line_request_get_requested_offsets(request);
line_objs = g_dbus_object_manager_get_objects(line_manager);
builder = g_strv_builder_new();
for (i = 0; i < offsets->len; i++) {
found = g_list_find_custom(line_objs,
&g_array_index(offsets, guint, i),
line_offset_cmp);
if (found)
g_strv_builder_add(builder,
g_dbus_object_get_object_path(
G_DBUS_OBJECT(found->data)));
}
paths = g_strv_builder_end(builder);
gpiodbus_request_set_chip_path(skeleton,
g_dbus_interface_skeleton_get_object_path(
G_DBUS_INTERFACE_SKELETON(chip)));
gpiodbus_request_set_line_paths(skeleton, (const gchar *const *)paths);
g_dbus_interface_skeleton_flush(G_DBUS_INTERFACE_SKELETON(skeleton));
}
static gboolean
set_settings_from_variant(GpiodglibLineSettings *settings, const gchar *key,
GVariant *val)
{
GpiodglibLineDirection direction;
GpiodglibLineClock event_clock;
GpiodglibLineDrive drive;
GpiodglibLineEdge edge;
GpiodglibLineBias bias;
const gchar *str;
/* FIXME: Make it into a nice set of hashmaps and callbacks. */
if (g_strcmp0(key, "direction") == 0) {
str = g_variant_get_string(val, NULL);
if (g_strcmp0(str, "input") == 0) {
direction = GPIODGLIB_LINE_DIRECTION_INPUT;
} else if (g_strcmp0(str, "output") == 0) {
direction = GPIODGLIB_LINE_DIRECTION_OUTPUT;
} else if (g_strcmp0(str, "as-is") == 0) {
direction = GPIODGLIB_LINE_DIRECTION_AS_IS;
} else {
g_critical("invalid direction value received: '%s'",
str);
return FALSE;
}
gpiodglib_line_settings_set_direction(settings, direction);
} else if (g_strcmp0(key, "edge") == 0) {
str = g_variant_get_string(val, NULL);
if (g_strcmp0(str, "falling") == 0) {
edge = GPIODGLIB_LINE_EDGE_FALLING;
} else if (g_strcmp0(str, "rising") == 0) {
edge = GPIODGLIB_LINE_EDGE_RISING;
} else if (g_strcmp0(str, "both") == 0) {
edge = GPIODGLIB_LINE_EDGE_BOTH;
} else {
g_critical("invalid edge value received: '%s'", str);
return FALSE;
}
gpiodglib_line_settings_set_edge_detection(settings, edge);
} else if (g_strcmp0(key, "active-low") == 0) {
if (g_variant_get_boolean(val))
gpiodglib_line_settings_set_active_low(settings, TRUE);
} else if (g_strcmp0(key, "bias") == 0) {
str = g_variant_get_string(val, NULL);
if (g_strcmp0(str, "as-is") == 0) {
bias = GPIODGLIB_LINE_BIAS_AS_IS;
} else if (g_strcmp0(str, "pull-up") == 0) {
bias = GPIODGLIB_LINE_BIAS_PULL_UP;
} else if (g_strcmp0(str, "pull-down") == 0) {
bias = GPIODGLIB_LINE_BIAS_PULL_DOWN;
} else if (g_strcmp0(str, "disabled") == 0) {
bias = GPIODGLIB_LINE_BIAS_DISABLED;
} else {
g_critical("invalid bias value received: '%s'", str);
return FALSE;
}
gpiodglib_line_settings_set_bias(settings, bias);
} else if (g_strcmp0(key, "drive") == 0) {
str = g_variant_get_string(val, NULL);
if (g_strcmp0(str, "push-pull") == 0) {
drive = GPIODGLIB_LINE_DRIVE_PUSH_PULL;
} else if (g_strcmp0(str, "open-drain") == 0) {
drive = GPIODGLIB_LINE_DRIVE_OPEN_DRAIN;
} else if (g_strcmp0(str, "open-source") == 0) {
drive = GPIODGLIB_LINE_DRIVE_OPEN_SOURCE;
} else {
g_critical("invalid drive value received: '%s'", str);
return FALSE;
}
gpiodglib_line_settings_set_drive(settings, drive);
} else if (g_strcmp0(key, "debounce-period") == 0) {
gpiodglib_line_settings_set_debounce_period_us(settings,
g_variant_get_int64(val));
} else if (g_strcmp0(key, "event-clock") == 0) {
str = g_variant_get_string(val, NULL);
if (g_strcmp0(str, "monotonic") == 0) {
event_clock = GPIODGLIB_LINE_CLOCK_MONOTONIC;
} else if (g_strcmp0(str, "realtime") == 0) {
event_clock = GPIODGLIB_LINE_CLOCK_REALTIME;
} else if (g_strcmp0(str, "hte") == 0) {
event_clock = GPIODGLIB_LINE_CLOCK_HTE;
} else {
g_critical("invalid event clock value received: '%s'",
str);
return FALSE;
}
gpiodglib_line_settings_set_event_clock(settings, event_clock);
} else {
g_critical("invalid config option received: '%s'", key);
return FALSE;
}
return TRUE;
}
GpiodglibLineConfig *gpiodbus_line_config_from_variant(GVariant *variant)
{
g_autoptr(GpiodglibLineSettings) settings = NULL;
g_autoptr(GpiodglibLineConfig) config = NULL;
g_autoptr(GVariant) output_values_v = NULL;
g_autoptr(GVariant) line_configs_v = NULL;
g_autoptr(GArray) values = NULL;
g_autoptr(GError) err = NULL;
GVariantIter iter0, iter1;
guint offset;
gboolean ret;
GVariant *v;
gchar *k;
gint val;
line_configs_v = g_variant_get_child_value(variant, 0);
output_values_v = g_variant_get_child_value(variant, 1);
config = gpiodglib_line_config_new();
settings = gpiodglib_line_settings_new(NULL);
g_variant_iter_init(&iter0, line_configs_v);
while ((v = g_variant_iter_next_value(&iter0))) {
g_autoptr(GVariant) line_settings_v = NULL;
g_autoptr(GVariant) line_config_v = v;
g_autoptr(GVariant) offsets_v = NULL;
g_autoptr(GArray) offsets = NULL;
offsets_v = g_variant_get_child_value(line_config_v, 0);
line_settings_v = g_variant_get_child_value(line_config_v, 1);
gpiodglib_line_settings_reset(settings);
g_variant_iter_init(&iter1, line_settings_v);
while (g_variant_iter_next(&iter1, "{sv}", &k, &v)) {
g_autoptr(GVariant) val = v;
g_autofree gchar *key = k;
ret = set_settings_from_variant(settings, key, val);
if (!ret)
return NULL;
}
offsets = g_array_sized_new(FALSE, TRUE, sizeof(guint),
g_variant_n_children(offsets_v));
g_variant_iter_init(&iter1, offsets_v);
while (g_variant_iter_next(&iter1, "u", &offset))
g_array_append_val(offsets, offset);
ret = gpiodglib_line_config_add_line_settings(config, offsets,
settings, &err);
if (!ret) {
g_critical("failed to add line settings: %s",
err->message);
return NULL;
}
}
values = g_array_sized_new(FALSE, TRUE, sizeof(gint),
g_variant_n_children(output_values_v));
g_variant_iter_init(&iter0, output_values_v);
while (g_variant_iter_next(&iter0, "i", &val))
g_array_append_val(values, val);
if (values->len > 0) {
ret = gpiodglib_line_config_set_output_values(config, values,
&err);
if (!ret) {
g_critical("failed to set output values: %s",
err->message);
return NULL;
}
}
return g_object_ref(config);
}
GpiodglibRequestConfig *gpiodbus_request_config_from_variant(GVariant *variant)
{
g_autoptr(GpiodglibRequestConfig) config = NULL;
GVariantIter iter;
GVariant *v;
gchar *k;
config = gpiodglib_request_config_new(NULL);
g_variant_iter_init(&iter, variant);
while (g_variant_iter_next(&iter, "{sv}", &k, &v)) {
g_autoptr(GVariant) val = v;
g_autofree gchar *key = k;
if (g_strcmp0(key, "consumer") == 0) {
gpiodglib_request_config_set_consumer(config,
g_variant_get_string(val, NULL));
} else if (g_strcmp0(key, "event-buffer-size") == 0) {
gpiodglib_request_config_set_event_buffer_size(config,
g_variant_get_uint32(val));
} else {
g_critical("invalid request config option received: '%s'",
key);
return NULL;
}
}
return g_object_ref(config);
}

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* SPDX-FileCopyrightText: 2023-2024 Bartosz Golaszewski <bartosz.golaszewski@linaro.org> */
#ifndef __GPIODBUS_HELPERS_H__
#define __GPIODBUS_HELPERS_H__
#include <gio/gio.h>
#include <gpiod-glib.h>
#include <glib.h>
#include <gpiodbus.h>
gint gpiodbus_id_cmp(gconstpointer a, gconstpointer b, gpointer user_data);
gint gpiodbus_id_alloc(GTree *id_root);
void gpiodbus_id_free(GTree *id_root, gint id);
gboolean
gpiodbus_chip_set_props(GpiodbusChip *skeleton, GpiodglibChip *chip,
GError **err);
void gpiodbus_line_set_props(GpiodbusLine *skeleton, GpiodglibLineInfo *info);
void gpiodbus_request_set_props(GpiodbusRequest *skeleton,
GpiodglibLineRequest *request,
GpiodbusChip *chip,
GDBusObjectManager *line_manager);
GpiodglibLineConfig *gpiodbus_line_config_from_variant(GVariant *variant);
GpiodglibRequestConfig *gpiodbus_request_config_from_variant(GVariant *variant);
#endif /* __GPIODBUS_HELPERS_H__ */

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# SPDX-License-Identifier: CC0-1.0
# SPDX-FileCopyrightText: 2022 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
gpiodbus-test

25
dbus/tests/Makefile.am Normal file
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# SPDX-License-Identifier: GPL-2.0-or-later
# SPDX-FileCopyrightText: 2022-2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
noinst_PROGRAMS = gpiodbus-test
gpiodbus_test_SOURCES = \
daemon-process.c \
daemon-process.h \
helpers.c \
helpers.h \
tests-chip.c \
tests-line.c \
tests-request.c
AM_CFLAGS = -I$(top_srcdir)/tests/gpiosim-glib/
AM_CFLAGS += -I$(top_builddir)/dbus/lib/ -I$(top_srcdir)/dbus/lib/
AM_CFLAGS += -I$(top_srcdir)/tests/harness/
AM_CFLAGS += -include $(top_builddir)/config.h
AM_CFLAGS += -Wall -Wextra -g -std=gnu89
AM_CFLAGS += $(GLIB_CFLAGS) $(GIO_CFLAGS)
AM_CFLAGS += -DG_LOG_DOMAIN=\"gpiodbus-test\"
LDADD = $(top_builddir)/tests/gpiosim/libgpiosim.la
LDADD += $(top_builddir)/tests/gpiosim-glib/libgpiosim-glib.la
LDADD += $(top_builddir)/tests/harness/libgpiod-test-harness.la
LDADD += $(top_builddir)/dbus/lib/libgpiodbus.la
LDADD += $(GLIB_LIBS) $(GIO_LIBS)

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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2022-2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <gio/gio.h>
#include <signal.h>
#include "daemon-process.h"
struct _GpiodbusDaemonProcess {
GObject parent_instance;
GSubprocess *proc;
};
G_DEFINE_TYPE(GpiodbusDaemonProcess, gpiodbus_daemon_process, G_TYPE_OBJECT);
static gboolean on_timeout(gpointer data G_GNUC_UNUSED)
{
g_error("timeout reached waiting for the daemon name to appear on the system bus");
return G_SOURCE_REMOVE;
}
static void on_name_appeared(GDBusConnection *con G_GNUC_UNUSED,
const gchar *name G_GNUC_UNUSED,
const gchar *name_owner G_GNUC_UNUSED,
gpointer data)
{
gboolean *name_state = data;
*name_state = TRUE;
}
static void gpiodbus_daemon_process_constructed(GObject *obj)
{
GpiodbusDaemonProcess *self = GPIODBUS_DAEMON_PROCESS_OBJ(obj);
const gchar *path = g_getenv("GPIODBUS_TEST_DAEMON_PATH");
g_autoptr(GDBusConnection) con = NULL;
g_autofree gchar *addr = NULL;
g_autoptr(GError) err = NULL;
gboolean name_state = FALSE;
guint watch_id, timeout_id;
if (!path)
g_error("GPIODBUS_TEST_DAEMON_PATH environment variable must be set");
addr = g_dbus_address_get_for_bus_sync(G_BUS_TYPE_SYSTEM, NULL, &err);
if (!addr)
g_error("failed to get an address for system bus: %s",
err->message);
con = g_dbus_connection_new_for_address_sync(addr,
G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT |
G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION,
NULL, NULL, &err);
if (!con)
g_error("failed to get a dbus connection: %s", err->message);
watch_id = g_bus_watch_name_on_connection(con, "io.gpiod1",
G_BUS_NAME_WATCHER_FLAGS_NONE,
on_name_appeared, NULL,
&name_state, NULL);
self->proc = g_subprocess_new(G_SUBPROCESS_FLAGS_STDOUT_SILENCE |
G_SUBPROCESS_FLAGS_STDERR_SILENCE,
&err, path, NULL);
if (!self->proc)
g_error("failed to launch the gpio-manager process: %s",
err->message);
timeout_id = g_timeout_add_seconds(5, on_timeout, NULL);
while (!name_state)
g_main_context_iteration(NULL, TRUE);
g_bus_unwatch_name(watch_id);
g_source_remove(timeout_id);
G_OBJECT_CLASS(gpiodbus_daemon_process_parent_class)->constructed(obj);
}
static void gpiodbus_daemon_process_kill(GSubprocess *proc)
{
g_autoptr(GError) err = NULL;
gint status;
g_subprocess_send_signal(proc, SIGTERM);
g_subprocess_wait(proc, NULL, &err);
if (err)
g_error("failed to collect the exit status of gpio-manager: %s",
err->message);
if (!g_subprocess_get_if_exited(proc))
g_error("dbus-manager process did not exit normally");
status = g_subprocess_get_exit_status(proc);
if (status != 0)
g_error("dbus-manager process exited with a non-zero status: %d",
status);
g_object_unref(proc);
}
static void gpiodbus_daemon_process_dispose(GObject *obj)
{
GpiodbusDaemonProcess *self = GPIODBUS_DAEMON_PROCESS_OBJ(obj);
g_clear_pointer(&self->proc, gpiodbus_daemon_process_kill);
G_OBJECT_CLASS(gpiodbus_daemon_process_parent_class)->dispose(obj);
}
static void
gpiodbus_daemon_process_class_init(GpiodbusDaemonProcessClass *proc_class)
{
GObjectClass *class = G_OBJECT_CLASS(proc_class);
class->constructed = gpiodbus_daemon_process_constructed;
class->dispose = gpiodbus_daemon_process_dispose;
}
static void gpiodbus_daemon_process_init(GpiodbusDaemonProcess *self)
{
self->proc = NULL;
}
GpiodbusDaemonProcess *gpiodbus_daemon_process_new(void)
{
return g_object_new(GPIODBUS_DAEMON_PROCESS_TYPE, NULL);
}

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* SPDX-FileCopyrightText: 2022-2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org> */
#ifndef __GPIODBUS_TEST_DAEMON_PROCESS_H__
#define __GPIODBUS_TEST_DAEMON_PROCESS_H__
#include <glib.h>
G_DECLARE_FINAL_TYPE(GpiodbusDaemonProcess, gpiodbus_daemon_process,
GPIODBUS, DAEMON_PROCESS, GObject);
#define GPIODBUS_DAEMON_PROCESS_TYPE (gpiodbus_daemon_process_get_type())
#define GPIODBUS_DAEMON_PROCESS_OBJ(obj) \
(G_TYPE_CHECK_INSTANCE_CAST(obj, \
GPIODBUS_DAEMON_PROCESS_TYPE, \
GpiodbusDaemonProcess))
GpiodbusDaemonProcess *gpiodbus_daemon_process_new(void);
#endif /* __GPIODBUS_TEST_DAEMON_PROCESS_H__ */

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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2022-2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <gio/gio.h>
#include "helpers.h"
GDBusConnection *gpiodbus_test_get_dbus_connection(void)
{
g_autoptr(GDBusConnection) con = NULL;
g_autofree gchar *addr = NULL;
g_autoptr(GError) err = NULL;
addr = g_dbus_address_get_for_bus_sync(G_BUS_TYPE_SYSTEM, NULL, &err);
if (!addr)
g_error("Failed to get address on the bus: %s", err->message);
con = g_dbus_connection_new_for_address_sync(addr,
G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT |
G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION,
NULL, NULL, &err);
if (!con)
g_error("Failed to get system bus connection: %s",
err->message);
return g_object_ref(con);
}
typedef struct {
gboolean *added;
gchar *obj_path;
} OnObjectAddedData;
static void on_object_added(GDBusObjectManager *manager G_GNUC_UNUSED,
GpiodbusObject *object, gpointer data)
{
OnObjectAddedData *cb_data = data;
const gchar *path;
path = g_dbus_object_get_object_path(G_DBUS_OBJECT(object));
if (g_strcmp0(path, cb_data->obj_path) == 0)
*cb_data->added = TRUE;
}
static gboolean on_timeout(gpointer data G_GNUC_UNUSED)
{
g_error("timeout reached waiting for the gpiochip interface to appear on the bus");
return G_SOURCE_REMOVE;
}
void gpiodbus_test_wait_for_sim_intf(GPIOSimChip *sim)
{
g_autoptr(GDBusObjectManager) manager = NULL;
g_autoptr(GDBusConnection) con = NULL;
g_autoptr(GpiodbusObject) obj = NULL;
g_autoptr(GError) err = NULL;
g_autofree gchar *obj_path;
OnObjectAddedData cb_data;
gboolean added = FALSE;
guint timeout_id;
con = gpiodbus_test_get_dbus_connection();
if (!con)
g_error("failed to obtain a bus connection: %s", err->message);
obj_path = g_strdup_printf("/io/gpiod1/chips/%s",
g_gpiosim_chip_get_name(sim));
cb_data.added = &added;
cb_data.obj_path = obj_path;
manager = gpiodbus_object_manager_client_new_sync(con,
G_DBUS_OBJECT_MANAGER_CLIENT_FLAGS_NONE,
"io.gpiod1", "/io/gpiod1/chips", NULL, &err);
if (!manager)
g_error("failed to create the object manager client: %s",
err->message);
g_signal_connect(manager, "object-added", G_CALLBACK(on_object_added),
&cb_data);
obj = GPIODBUS_OBJECT(g_dbus_object_manager_get_object(manager,
obj_path));
if (obj) {
if (g_strcmp0(g_dbus_object_get_object_path(G_DBUS_OBJECT(obj)),
obj_path) == 0)
added = TRUE;
}
timeout_id = g_timeout_add_seconds(5, on_timeout, NULL);
while (!added)
g_main_context_iteration(NULL, TRUE);
g_source_remove(timeout_id);
}
GVariant *gpiodbus_test_make_empty_request_config(void)
{
GVariantBuilder builder;
g_variant_builder_init(&builder, G_VARIANT_TYPE("a{sv}"));
return g_variant_ref_sink(g_variant_builder_end(&builder));
}

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* SPDX-FileCopyrightText: 2022-2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org> */
#ifndef __GPIODBUS_TEST_INTERNAL_H__
#define __GPIODBUS_TEST_INTERNAL_H__
#include <gio/gio.h>
#include <glib.h>
#include <gpiodbus.h>
#include <gpiosim-glib.h>
#define __gpiodbus_test_check_gboolean_and_error(_ret, _err) \
do { \
g_assert_true(_ret); \
g_assert_no_error(_err); \
gpiod_test_return_if_failed(); \
} while (0)
#define __gpiodbus_test_check_nonnull_and_error(_ptr, _err) \
do { \
g_assert_nonnull(_ptr); \
g_assert_no_error(_err); \
gpiod_test_return_if_failed(); \
} while (0)
#define gpiodbus_test_get_chip_proxy_or_fail(_obj_path) \
({ \
g_autoptr(GDBusConnection) _con = NULL; \
g_autoptr(GError) _err = NULL; \
g_autoptr(GpiodbusChip) _chip = NULL; \
_con = gpiodbus_test_get_dbus_connection(); \
_chip = gpiodbus_chip_proxy_new_sync(_con, \
G_DBUS_PROXY_FLAGS_NONE, \
"io.gpiod1", _obj_path, \
NULL, &_err); \
__gpiodbus_test_check_nonnull_and_error(_chip, _err); \
g_object_ref(_chip); \
})
#define gpiodbus_test_get_line_proxy_or_fail(_obj_path) \
({ \
g_autoptr(GDBusConnection) _con = NULL; \
g_autoptr(GError) _err = NULL; \
g_autoptr(GpiodbusLine) _line = NULL; \
_con = gpiodbus_test_get_dbus_connection(); \
_line = gpiodbus_line_proxy_new_sync(_con, \
G_DBUS_PROXY_FLAGS_NONE, \
"io.gpiod1", _obj_path, \
NULL, &_err); \
__gpiodbus_test_check_nonnull_and_error(_line, _err); \
g_object_ref(_line); \
})
#define gpiodbus_test_get_request_proxy_or_fail(_obj_path) \
({ \
g_autoptr(GDBusConnection) _con = NULL; \
g_autoptr(GError) _err = NULL; \
g_autoptr(GpiodbusRequest) _req = NULL; \
_con = gpiodbus_test_get_dbus_connection(); \
_req = gpiodbus_request_proxy_new_sync(_con, \
G_DBUS_PROXY_FLAGS_NONE, \
"io.gpiod1", _obj_path, \
NULL, &_err); \
__gpiodbus_test_check_nonnull_and_error(_req, _err); \
g_object_ref(_req); \
})
#define gpiodbus_test_get_chip_object_manager_or_fail() \
({ \
g_autoptr(GDBusObjectManager) _manager = NULL; \
g_autoptr(GDBusConnection) _con = NULL; \
g_autoptr(GError) _err = NULL; \
_con = gpiodbus_test_get_dbus_connection(); \
_manager = gpiodbus_object_manager_client_new_sync( \
_con, \
G_DBUS_OBJECT_MANAGER_CLIENT_FLAGS_NONE, \
"io.gpiod1", "/io/gpiod1/chips", NULL, \
&_err); \
__gpiodbus_test_check_nonnull_and_error(_manager, _err); \
g_object_ref(_manager); \
})
#define gpiodbus_test_chip_call_request_lines_sync_or_fail(_chip, \
_line_config, \
_request_config, \
_request_path) \
do { \
g_autoptr(GError) _err = NULL; \
gboolean _ret; \
_ret = gpiodbus_chip_call_request_lines_sync( \
_chip, _line_config, \
_request_config, \
G_DBUS_CALL_FLAGS_NONE, -1, \
_request_path, NULL, &_err); \
__gpiodbus_test_check_gboolean_and_error(_ret, _err); \
} while (0)
#define gpiodbus_test_request_call_release_sync_or_fail(_request) \
do { \
g_autoptr(GError) _err = NULL; \
gboolean _ret; \
_ret = gpiodbus_request_call_release_sync( \
_request, \
G_DBUS_CALL_FLAGS_NONE, \
-1, NULL, &_err); \
__gpiodbus_test_check_gboolean_and_error(_ret, _err); \
} while (0)
GDBusConnection *gpiodbus_test_get_dbus_connection(void);
void gpiodbus_test_wait_for_sim_intf(GPIOSimChip *sim);
GVariant *gpiodbus_test_make_empty_request_config(void);
#endif /* __GPIODBUS_TEST_INTERNAL_H__ */

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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2022-2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <gio/gio.h>
#include <glib.h>
#include <gpiod-test.h>
#include <gpiod-test-common.h>
#include <gpiodbus.h>
#include <gpiosim-glib.h>
#include "daemon-process.h"
#include "helpers.h"
#define GPIOD_TEST_GROUP "gpiodbus/chip"
GPIOD_TEST_CASE(read_chip_info)
{
g_autoptr(GPIOSimChip) sim = g_gpiosim_chip_new("num-lines", 8,
"label", "foobar",
NULL);
g_autoptr(GpiodbusDaemonProcess) mgr = NULL;
g_autoptr(GpiodbusChip) chip = NULL;
g_autofree gchar *obj_path = NULL;
mgr = gpiodbus_daemon_process_new();
gpiodbus_test_wait_for_sim_intf(sim);
obj_path = g_strdup_printf("/io/gpiod1/chips/%s",
g_gpiosim_chip_get_name(sim));
chip = gpiodbus_test_get_chip_proxy_or_fail(obj_path);
g_assert_cmpstr(gpiodbus_chip_get_name(chip), ==,
g_gpiosim_chip_get_name(sim));
g_assert_cmpstr(gpiodbus_chip_get_label(chip), ==, "foobar");
g_assert_cmpuint(gpiodbus_chip_get_num_lines(chip), ==, 8);
g_assert_cmpstr(gpiodbus_chip_get_path(chip), ==,
g_gpiosim_chip_get_dev_path(sim));
}
static gboolean on_timeout(gpointer user_data)
{
gboolean *timed_out = user_data;
*timed_out = TRUE;
return G_SOURCE_REMOVE;
}
static void on_object_event(GDBusObjectManager *manager G_GNUC_UNUSED,
GpiodbusObject *object, gpointer user_data)
{
gchar **obj_path = user_data;
*obj_path = g_strdup(g_dbus_object_get_object_path(
G_DBUS_OBJECT(object)));
}
GPIOD_TEST_CASE(chip_added)
{
g_autoptr(GDBusObjectManager) manager = NULL;
g_autoptr(GpiodbusDaemonProcess) mgr = NULL;
g_autofree gchar *sim_obj_path = NULL;
g_autoptr(GPIOSimChip) sim = NULL;
g_autofree gchar *obj_path = NULL;
gboolean timed_out = FALSE;
guint timeout_id;
mgr = gpiodbus_daemon_process_new();
manager = gpiodbus_test_get_chip_object_manager_or_fail();
g_signal_connect(manager, "object-added", G_CALLBACK(on_object_event),
&obj_path);
timeout_id = g_timeout_add_seconds(5, on_timeout, &timed_out);
sim = g_gpiosim_chip_new(NULL);
while (!obj_path && !timed_out)
g_main_context_iteration(NULL, TRUE);
if (timed_out) {
g_test_fail_printf("timeout reached waiting for chip to be added");
return;
}
sim_obj_path = g_strdup_printf("/io/gpiod1/chips/%s",
g_gpiosim_chip_get_name(sim));
g_assert_cmpstr(sim_obj_path, ==, obj_path);
g_source_remove(timeout_id);
}
GPIOD_TEST_CASE(chip_removed)
{
g_autoptr(GPIOSimChip) sim = g_gpiosim_chip_new(NULL);
g_autoptr(GDBusObjectManager) manager = NULL;
g_autoptr(GpiodbusDaemonProcess) mgr = NULL;
g_autofree gchar *sim_obj_path = NULL;
g_autoptr(GpiodbusChip) chip = NULL;
g_autofree gchar *obj_path = NULL;
gboolean timed_out = FALSE;
guint timeout_id;
sim_obj_path = g_strdup_printf("/io/gpiod1/chips/%s",
g_gpiosim_chip_get_name(sim));
mgr = gpiodbus_daemon_process_new();
gpiodbus_test_wait_for_sim_intf(sim);
obj_path = g_strdup_printf("/io/gpiod1/chips/%s",
g_gpiosim_chip_get_name(sim));
chip = gpiodbus_test_get_chip_proxy_or_fail(obj_path);
manager = gpiodbus_test_get_chip_object_manager_or_fail();
g_signal_connect(manager, "object-removed", G_CALLBACK(on_object_event),
&obj_path);
timeout_id = g_timeout_add_seconds(5, on_timeout, &timed_out);
g_clear_object(&sim);
while (!obj_path && !timed_out)
g_main_context_iteration(NULL, TRUE);
if (timed_out) {
g_test_fail_printf("timeout reached waiting for chip to be removed");
return;
}
g_assert_cmpstr(sim_obj_path, ==, obj_path);
g_source_remove(timeout_id);
}

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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <gio/gio.h>
#include <glib.h>
#include <gpiod-test.h>
#include <gpiod-test-common.h>
#include <gpiodbus.h>
#include <gpiosim-glib.h>
#include "daemon-process.h"
#include "helpers.h"
#define GPIOD_TEST_GROUP "gpiodbus/line"
GPIOD_TEST_CASE(read_line_properties)
{
static const GPIOSimLineName names[] = {
{ .offset = 1, .name = "foo", },
{ .offset = 2, .name = "bar", },
{ .offset = 4, .name = "baz", },
{ .offset = 5, .name = "xyz", },
{ }
};
static const GPIOSimHog hogs[] = {
{
.offset = 3,
.name = "hog3",
.direction = G_GPIOSIM_DIRECTION_OUTPUT_HIGH,
},
{
.offset = 4,
.name = "hog4",
.direction = G_GPIOSIM_DIRECTION_OUTPUT_LOW,
},
{ }
};
g_autoptr(GpiodbusDaemonProcess) mgr = NULL;
g_autoptr(GpiodbusLine) line4 = NULL;
g_autoptr(GpiodbusLine) line6 = NULL;
g_autofree gchar *obj_path_4 = NULL;
g_autofree gchar *obj_path_6 = NULL;
g_autoptr(GPIOSimChip) sim = NULL;
g_autoptr(GVariant) vnames = g_gpiosim_package_line_names(names);
g_autoptr(GVariant) vhogs = g_gpiosim_package_hogs(hogs);
sim = g_gpiosim_chip_new(
"num-lines", 8,
"line-names", vnames,
"hogs", vhogs,
NULL);
mgr = gpiodbus_daemon_process_new();
gpiodbus_test_wait_for_sim_intf(sim);
obj_path_4 = g_strdup_printf("/io/gpiod1/chips/%s/line4",
g_gpiosim_chip_get_name(sim));
line4 = gpiodbus_test_get_line_proxy_or_fail(obj_path_4);
obj_path_6 = g_strdup_printf("/io/gpiod1/chips/%s/line6",
g_gpiosim_chip_get_name(sim));
line6 = gpiodbus_test_get_line_proxy_or_fail(obj_path_6);
g_assert_cmpuint(gpiodbus_line_get_offset(line4), ==, 4);
g_assert_cmpstr(gpiodbus_line_get_name(line4), ==, "baz");
g_assert_cmpstr(gpiodbus_line_get_consumer(line4), ==, "hog4");
g_assert_true(gpiodbus_line_get_used(line4));
g_assert_false(gpiodbus_line_get_managed(line4));
g_assert_cmpstr(gpiodbus_line_get_direction(line4), ==, "output");
g_assert_cmpstr(gpiodbus_line_get_edge_detection(line4), ==, "none");
g_assert_false(gpiodbus_line_get_active_low(line4));
g_assert_cmpstr(gpiodbus_line_get_bias(line4), ==, "unknown");
g_assert_cmpstr(gpiodbus_line_get_drive(line4), ==, "push-pull");
g_assert_cmpstr(gpiodbus_line_get_event_clock(line4), ==, "monotonic");
g_assert_false(gpiodbus_line_get_debounced(line4));
g_assert_cmpuint(gpiodbus_line_get_debounce_period_us(line4), ==, 0);
g_assert_cmpuint(gpiodbus_line_get_offset(line6), ==, 6);
g_assert_cmpstr(gpiodbus_line_get_name(line6), ==, "");
g_assert_cmpstr(gpiodbus_line_get_consumer(line6), ==, "");
g_assert_false(gpiodbus_line_get_used(line6));
}
static gboolean on_timeout(gpointer user_data)
{
gboolean *timed_out = user_data;
*timed_out = TRUE;
return G_SOURCE_REMOVE;
}
static void
on_properties_changed(GpiodbusLine *line G_GNUC_UNUSED,
GVariant *changed_properties,
GStrv invalidated_properties G_GNUC_UNUSED,
gpointer user_data)
{
GHashTable *changed_props = user_data;
GVariantIter iter;
GVariant *variant;
gchar *str;
g_variant_iter_init(&iter, changed_properties);
while (g_variant_iter_next(&iter, "{sv}", &str, &variant)) {
g_hash_table_insert(changed_props, str, NULL);
g_variant_unref(variant);
}
}
static void check_props_requested(GHashTable *props)
{
if (!g_hash_table_contains(props, "Direction") ||
!g_hash_table_contains(props, "Consumer") ||
!g_hash_table_contains(props, "Used") ||
!g_hash_table_contains(props, "RequestPath") ||
!g_hash_table_contains(props, "Managed"))
g_test_fail_printf("Not all expected properties have changed");
}
static void check_props_released(GHashTable *props)
{
if (!g_hash_table_contains(props, "RequestPath") ||
!g_hash_table_contains(props, "Consumer") ||
!g_hash_table_contains(props, "Used") ||
!g_hash_table_contains(props, "Managed"))
g_test_fail_printf("Not all expected properties have changed");
}
static GVariant *make_props_changed_line_config(void)
{
g_autoptr(GVariant) output_values = NULL;
g_autoptr(GVariant) line_settings = NULL;
g_autoptr(GVariant) line_offsets = NULL;
g_autoptr(GVariant) line_configs = NULL;
g_autoptr(GVariant) line_config = NULL;
GVariantBuilder builder;
g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
g_variant_builder_add_value(&builder, g_variant_new_uint32(4));
line_offsets = g_variant_builder_end(&builder);
g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
g_variant_builder_add_value(&builder,
g_variant_new("{sv}", "direction",
g_variant_new_string("output")));
line_settings = g_variant_builder_end(&builder);
g_variant_builder_init(&builder, G_VARIANT_TYPE_TUPLE);
g_variant_builder_add_value(&builder, g_variant_ref(line_offsets));
g_variant_builder_add_value(&builder, g_variant_ref(line_settings));
line_config = g_variant_builder_end(&builder);
g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
g_variant_builder_add_value(&builder, g_variant_ref(line_config));
line_configs = g_variant_builder_end(&builder);
output_values = g_variant_new("ai", NULL);
g_variant_builder_init(&builder, G_VARIANT_TYPE_TUPLE);
g_variant_builder_add_value(&builder, g_variant_ref(line_configs));
g_variant_builder_add_value(&builder, g_variant_ref(output_values));
return g_variant_ref_sink(g_variant_builder_end(&builder));
}
GPIOD_TEST_CASE(properties_changed)
{
g_autoptr(GPIOSimChip) sim = g_gpiosim_chip_new("num-lines", 8, NULL);
g_autoptr(GpiodbusDaemonProcess) mgr = NULL;
g_autoptr(GHashTable) changed_props = NULL;
g_autoptr(GpiodbusRequest) request = NULL;
g_autoptr(GVariant) request_config = NULL;
g_autoptr(GVariant) line_config = NULL;
g_autofree gchar *line_obj_path = NULL;
g_autofree gchar *chip_obj_path = NULL;
g_autofree gchar *request_path = NULL;
g_autoptr(GpiodbusChip) chip = NULL;
g_autoptr(GpiodbusLine) line = NULL;
gboolean timed_out = FALSE;
guint timeout_id;
mgr = gpiodbus_daemon_process_new();
gpiodbus_test_wait_for_sim_intf(sim);
line_obj_path = g_strdup_printf("/io/gpiod1/chips/%s/line4",
g_gpiosim_chip_get_name(sim));
line = gpiodbus_test_get_line_proxy_or_fail(line_obj_path);
chip_obj_path = g_strdup_printf("/io/gpiod1/chips/%s",
g_gpiosim_chip_get_name(sim));
chip = gpiodbus_test_get_chip_proxy_or_fail(chip_obj_path);
changed_props = g_hash_table_new_full(g_str_hash, g_str_equal, g_free,
NULL);
g_signal_connect(line, "g-properties-changed",
G_CALLBACK(on_properties_changed), changed_props);
timeout_id = g_timeout_add_seconds(5, on_timeout, &timed_out);
line_config = make_props_changed_line_config();
request_config = gpiodbus_test_make_empty_request_config();
gpiodbus_test_chip_call_request_lines_sync_or_fail(chip, line_config,
request_config,
&request_path);
while (g_hash_table_size(changed_props) < 5 && !timed_out)
g_main_context_iteration(NULL, TRUE);
check_props_requested(changed_props);
g_hash_table_destroy(g_hash_table_ref(changed_props));
request = gpiodbus_test_get_request_proxy_or_fail(request_path);
gpiodbus_test_request_call_release_sync_or_fail(request);
while (g_hash_table_size(changed_props) < 4 && !timed_out)
g_main_context_iteration(NULL, TRUE);
check_props_released(changed_props);
if (timed_out) {
g_test_fail_printf("timeout reached waiting for line properties to change");
return;
}
g_source_remove(timeout_id);
}

116
dbus/tests/tests-request.c Normal file
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@@ -0,0 +1,116 @@
// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2022-2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <gio/gio.h>
#include <glib.h>
#include <gpiod-test.h>
#include <gpiod-test-common.h>
#include <gpiodbus.h>
#include <gpiosim-glib.h>
#include "daemon-process.h"
#include "helpers.h"
#define GPIOD_TEST_GROUP "gpiodbus/request"
static GVariant *make_empty_request_config(void)
{
GVariantBuilder builder;
g_variant_builder_init(&builder, G_VARIANT_TYPE("a{sv}"));
return g_variant_ref_sink(g_variant_builder_end(&builder));
}
static GVariant *make_input_lines_line_config(void)
{
g_autoptr(GVariant) output_values = NULL;
g_autoptr(GVariant) line_settings = NULL;
g_autoptr(GVariant) line_offsets = NULL;
g_autoptr(GVariant) line_configs = NULL;
g_autoptr(GVariant) line_config = NULL;
GVariantBuilder builder;
g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
g_variant_builder_add_value(&builder, g_variant_new_uint32(3));
g_variant_builder_add_value(&builder, g_variant_new_uint32(5));
g_variant_builder_add_value(&builder, g_variant_new_uint32(7));
line_offsets = g_variant_builder_end(&builder);
g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
g_variant_builder_add_value(&builder,
g_variant_new("{sv}", "direction",
g_variant_new_string("input")));
line_settings = g_variant_builder_end(&builder);
g_variant_builder_init(&builder, G_VARIANT_TYPE_TUPLE);
g_variant_builder_add_value(&builder, g_variant_ref(line_offsets));
g_variant_builder_add_value(&builder, g_variant_ref(line_settings));
line_config = g_variant_builder_end(&builder);
g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
g_variant_builder_add_value(&builder, g_variant_ref(line_config));
line_configs = g_variant_builder_end(&builder);
output_values = g_variant_new("ai", NULL);
g_variant_builder_init(&builder, G_VARIANT_TYPE_TUPLE);
g_variant_builder_add_value(&builder, g_variant_ref(line_configs));
g_variant_builder_add_value(&builder, g_variant_ref(output_values));
return g_variant_ref_sink(g_variant_builder_end(&builder));
}
GPIOD_TEST_CASE(request_input_lines)
{
g_autoptr(GPIOSimChip) sim = g_gpiosim_chip_new("num-lines", 8, NULL);
g_autoptr(GpiodbusDaemonProcess) mgr = NULL;
g_autoptr(GVariant) request_config = NULL;
g_autoptr(GVariant) line_config = NULL;
g_autofree gchar *request_path = NULL;
g_autoptr(GpiodbusChip) chip = NULL;
g_autofree gchar *obj_path = NULL;
mgr = gpiodbus_daemon_process_new();
gpiodbus_test_wait_for_sim_intf(sim);
obj_path = g_strdup_printf("/io/gpiod1/chips/%s",
g_gpiosim_chip_get_name(sim));
chip = gpiodbus_test_get_chip_proxy_or_fail(obj_path);
line_config = make_input_lines_line_config();
request_config = make_empty_request_config();
gpiodbus_test_chip_call_request_lines_sync_or_fail(chip, line_config,
request_config,
&request_path);
}
GPIOD_TEST_CASE(release_request)
{
g_autoptr(GPIOSimChip) sim = g_gpiosim_chip_new("num-lines", 8, NULL);
g_autoptr(GpiodbusDaemonProcess) mgr = NULL;
g_autoptr(GVariant) request_config = NULL;
g_autoptr(GpiodbusRequest) request = NULL;
g_autoptr(GVariant) line_config = NULL;
g_autofree gchar *request_path = NULL;
g_autoptr(GpiodbusChip) chip = NULL;
g_autofree gchar *obj_path = NULL;
mgr = gpiodbus_daemon_process_new();
gpiodbus_test_wait_for_sim_intf(sim);
obj_path = g_strdup_printf("/io/gpiod1/chips/%s",
g_gpiosim_chip_get_name(sim));
chip = gpiodbus_test_get_chip_proxy_or_fail(obj_path);
line_config = make_input_lines_line_config();
request_config = make_empty_request_config();
gpiodbus_test_chip_call_request_lines_sync_or_fail(chip, line_config,
request_config,
&request_path);
request = gpiodbus_test_get_request_proxy_or_fail(request_path);
gpiodbus_test_request_call_release_sync_or_fail(request);
}