Currently we're not checking if the object returned from
gpiod.fine_line() is None which results in an attribute error being
raised when we try to call line methods on a non-line object.
Add an if and bail-out with an error code if the line with given name
was not found.
Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
Currently if we call gpiod_Chip_find_lines() with some names that
cannot be looked up, we end up getting an exception from the LineBulk
object's constructor (because None is not a Line and LineBulk can only
hold Line objects).
Fix the behavior of gpiod_Chip_find_lines() for nonexistent lines by
raising an explicit exception if the underlying gpiod_Chip_find_line()
call returns None. Also: add a relevant test case.
Fixes: 96c524c495 ("bindings: implement python bindings")
Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
Unlike the C++ bindings: we can't expect the python runtime to call
the Chip object's destructor when all references are dropped. We need
to close each chip explicitly. Either call the close() method directly
or use controlled execution in all examples.
Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
Add two new tests verifying the default_vals argument in line requests
for single and multiple lines.
Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
Strings with slashes trigger a warning in the kernel in
fs/proc/generic.c. Use a hardcoded consumer string.
Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
Provide __enter__ and __exit__ callbacks for Chip so that it can be
used with the 'with' statement.
Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
So far we rely on cpython's reference counting for closing the GPIO
chips and freeing the underlying resources. This is however wrong.
Python doesn't guarantee anything regarding the lifetime of an object.
Provide a method for closing the underlying chip handle and add
relevant checks to all methods using the resources associated with
a GPIO chip, so that we raise an error should the user use a chip
after closing it.
Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
Add more test cases/examples, implement some helper functions, tweak
the output messages, mention the need for a dummy chip in the system
in the module's pydoc string.
Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
Create a C extension module wrapping the functionality of libgpiod
in a set of Python classes.
Add code examples including simplified reimplementations of gpio-tools
in Python.
Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
