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Commit e7191474 authored by David Herrmann's avatar David Herrmann Committed by Jiri Kosina
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HID: uhid: forward open/close events to user-space 



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: default avatarDavid Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent ec4b7dea

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,

};