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authorAndrzej Pietrasiewicz <andrzej.p@collabora.com>2020-10-05 07:15:46 +0300
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2020-12-03 09:10:31 +0300
commit39be39ceffd572baddfeff8b50aba931d3d6d785 (patch)
tree3658d328a22b8627b91a08eb818b642b3de0d35c
parentc1b46cd4df97534c6b942bb30526a2c47f0cb3c8 (diff)
downloadlinux-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.c8
-rw-r--r--include/linux/input.h2
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;
/**