diff options
| author | Andrzej Pietrasiewicz <andrzej.p@collabora.com> | 2020-10-05 07:15:46 +0300 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2020-12-03 09:10:31 +0300 |
| commit | 39be39ceffd572baddfeff8b50aba931d3d6d785 (patch) | |
| tree | 3658d328a22b8627b91a08eb818b642b3de0d35c | |
| parent | c1b46cd4df97534c6b942bb30526a2c47f0cb3c8 (diff) | |
| download | linux-39be39ceffd572baddfeff8b50aba931d3d6d785.tar.xz | |
Input: add input_device_enabled()
A helper function for drivers to decide if the device is used or not.
A lockdep check is introduced as inspecting ->users should be done under
input device's mutex.
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Link: https://lore.kernel.org/r/20200608112211.12125-2-andrzej.p@collabora.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
| -rw-r--r-- | drivers/input/input.c | 8 | ||||
| -rw-r--r-- | include/linux/input.h | 2 |
2 files changed, 10 insertions, 0 deletions
diff --git a/drivers/input/input.c b/drivers/input/input.c index 3cfd2c18eebd..41377bfa142d 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -2127,6 +2127,14 @@ void input_enable_softrepeat(struct input_dev *dev, int delay, int period) } EXPORT_SYMBOL(input_enable_softrepeat); +bool input_device_enabled(struct input_dev *dev) +{ + lockdep_assert_held(&dev->mutex); + + return dev->users > 0; +} +EXPORT_SYMBOL_GPL(input_device_enabled); + /** * input_register_device - register device with input core * @dev: device to be registered diff --git a/include/linux/input.h b/include/linux/input.h index 56f2fd32e609..eda4587dba67 100644 --- a/include/linux/input.h +++ b/include/linux/input.h @@ -502,6 +502,8 @@ bool input_match_device_id(const struct input_dev *dev, void input_enable_softrepeat(struct input_dev *dev, int delay, int period); +bool input_device_enabled(struct input_dev *dev); + extern struct class input_class; /** |