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@xxxxxxxxxxxxxx>
---
drivers/hid/uhid.c | 7 ++++++-
include/linux/uhid.h | 2 ++
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/hid/uhid.c b/drivers/hid/uhid.c
index 2e7f3a0..0226ba3f 100644
--- a/drivers/hid/uhid.c
+++ b/drivers/hid/uhid.c
@@ -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,
diff --git a/include/linux/uhid.h b/include/linux/uhid.h
index f8ce6f7..351650b 100644
--- a/include/linux/uhid.h
+++ b/include/linux/uhid.h
@@ -27,6 +27,8 @@ enum uhid_event_type {
UHID_DESTROY,
UHID_START,
UHID_STOP,
+ UHID_OPEN,
+ UHID_CLOSE,
UHID_INPUT,
};
--
1.7.10.4
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