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Documentation: input: Add section pertaining to polled input devices

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Added section in Documentation/input/input-programming.rst about
input_setup_polling() and input_set_poll_interval()

Signed-off-by: Brendan Connelly <brendanjconnelly17@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250208173554.209688-1-brendanjconnelly17@gmail.com
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Brendan Connelly
2025-02-08 12:35:54 -05:00
committed by Jonathan Corbet
parent 4dd4eef60f
commit 76a6782284
1 changed files with 19 additions and 0 deletions
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Documentation/input/input-programming.rst
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@@ -346,3 +346,22 @@ driver can handle these events, it has to set the respective bits in evbit,
This callback routine can be called from an interrupt or a BH (although that
isn't a rule), and thus must not sleep, and must not take too long to finish.
Polled input devices
~~~~~~~~~~~~~~~~~~~~
Input polling is set up by passing an input device struct and a callback to
the function::
int input_setup_polling(struct input_dev *dev,
void (*poll_fn)(struct input_dev *dev))
Within the callback, devices should use the regular input_report_* functions
and input_sync as is used by other devices.
There is also the function::
void input_set_poll_interval(struct input_dev *dev, unsigned int interval)
which is used to configure the interval, in milliseconds, that the device will
be polled at.