[PATCH v4 1/7] Input: add input_device_enabled()
From: Andrzej Pietrasiewicz <hidden>
Date: 2020-06-08 11:22:29
Also in:
linux-acpi, linux-iio, linux-input, linux-pm, linux-samsung-soc, linux-tegra, lkml, platform-driver-x86
Subsystem:
input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Dmitry Torokhov, Linus Torvalds
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 <redacted> --- drivers/input/input.c | 8 ++++++++ include/linux/input.h | 2 ++ 2 files changed, 10 insertions(+)
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; /**
--
2.17.1
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