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bindings: python: ext: add ability to query line name

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Investigation has shown that the construction of the Enum values to
create the LineInfo object is expensive [0].

Add a method to retrieve the line name from a given offset without the
overhead of generating a full LineInfo object.

[0]: https://github.com/brgl/libgpiod/issues/149#issuecomment-3319448712

Signed-off-by: Vincent Fazio <vfazio@gmail.com>
Link: https://lore.kernel.org/r/20251009130516.3729433-8-vfazio@gmail.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Vincent Fazio
2025-10-09 08:05:13 -05:00
committed by Bartosz Golaszewski
parent e2d7b6abaf
commit 0c0993569c
2 changed files with 32 additions and 0 deletions
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1
bindings/python/gpiod/_ext.pyi
View File

@@ -47,6 +47,7 @@ class Chip:
def get_info(self) -> ChipInfo: ...
def line_offset_from_id(self, id: str) -> int: ...
def get_line_info(self, offset: int, watch: bool) -> LineInfo: ...
def get_line_name(self, offset: int) -> Optional[str]: ...
def request_lines(
self,
line_cfg: LineConfig,

31
bindings/python/gpiod/ext/chip.c
View File

@@ -147,6 +147,32 @@ static PyObject *chip_get_line_info(chip_object *self, PyObject *args)
return info_obj;
}
static PyObject *chip_get_line_name(chip_object *self, PyObject *args)
{
int ret;
unsigned int offset;
struct gpiod_line_info *info;
PyObject *line_name;
const char *name;
ret = PyArg_ParseTuple(args, "I", &offset);
if (!ret)
return NULL;
Py_BEGIN_ALLOW_THREADS;
info = gpiod_chip_get_line_info(self->chip, offset);
Py_END_ALLOW_THREADS;
if (!info)
return Py_gpiod_SetErrFromErrno();
name = gpiod_line_info_get_name(info);
line_name = (name == NULL) ? Py_None : PyUnicode_FromString(name);
gpiod_line_info_free(info);
return line_name;
}
static PyObject *
chip_unwatch_line_info(chip_object *self, PyObject *args)
{
@@ -333,6 +359,11 @@ static PyMethodDef chip_methods[] = {
.ml_meth = (PyCFunction)chip_request_lines,
.ml_flags = METH_VARARGS,
},
{
.ml_name = "get_line_name",
.ml_meth = (PyCFunction)chip_get_line_name,
.ml_flags = METH_VARARGS,
},
{ }
};