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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: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
hifive-unleashed-5.1
David Herrmann 2012-06-10 15:16:22 +02:00 committed by Jiri Kosina
parent ec4b7dea45
commit e7191474a5
2 changed files with 8 additions and 1 deletions
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7
drivers/hid/uhid.c
View File

@ -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,

2
include/linux/uhid.h
View File

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