HID: uhid: forward open/close events to user-space (e7191474) · Commits · 戴 / test

HID core notifies us with *_open/*_close callbacks when there is an actual user of our device. We forward these to user-space so they can react on this. This allows user-space to skip I/O unless they receive an OPEN event. When they receive a CLOSE event they can stop I/O again to save energy. Signed-off-by:

David Herrmann <dh.herrmann@googlemail.com> Signed-off-by:

Jiri Kosina <jkosina@suse.cz>

drivers/hid/uhid.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -97,11 +97,16 @@ static void uhid_hid_stop(struct hid_device *hid)

		static int uhid_hid_open(struct hid_device *hid)
		{
		return 0;
		struct uhid_device *uhid = hid->driver_data;

		return uhid_queue_event(uhid, UHID_OPEN);
		}

		static void uhid_hid_close(struct hid_device *hid)
		{
		struct uhid_device *uhid = hid->driver_data;

		uhid_queue_event(uhid, UHID_CLOSE);
		}

		static int uhid_hid_input(struct input_dev *input, unsigned int type,

include/linux/uhid.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -27,6 +27,8 @@ enum uhid_event_type {
		UHID_DESTROY,
		UHID_START,
		UHID_STOP,
		UHID_OPEN,
		UHID_CLOSE,
		UHID_INPUT,
		};

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