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Commit f80e1360 authored by David Herrmann's avatar David Herrmann Committed by Jiri Kosina
Browse files

HID: uhid: forward output request to user-space 



If the hid-driver wants to send standardized data to the device it uses a
linux input_event. We forward this to the user-space transport-level
driver so they can perform the requested action on the device.

Signed-off-by: default avatarDavid Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent e7191474

drivers/hid/uhid.c

+18 −0
Original line number Diff line number Diff line
@@ -112,6 +112,24 @@ static void uhid_hid_close(struct hid_device *hid) 
static int uhid_hid_input(struct input_dev *input, unsigned int type,

			  unsigned int code, int value)

{

	struct hid_device *hid = input_get_drvdata(input);

	struct uhid_device *uhid = hid->driver_data;

	unsigned long flags;

	struct uhid_event *ev;



	ev = kzalloc(sizeof(*ev), GFP_ATOMIC);

	if (!ev)

		return -ENOMEM;



	ev->type = UHID_OUTPUT_EV;

	ev->u.output_ev.type = type;

	ev->u.output_ev.code = code;

	ev->u.output_ev.value = value;



	spin_lock_irqsave(&uhid->qlock, flags);

	uhid_queue(uhid, ev);

	spin_unlock_irqrestore(&uhid->qlock, flags);



	return 0;

}

include/linux/uhid.h

+8 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ enum uhid_event_type { 
	UHID_STOP,

	UHID_OPEN,

	UHID_CLOSE,

	UHID_OUTPUT_EV,

	UHID_INPUT,

};
@@ -53,12 +54,19 @@ struct uhid_input_req { 
	__u16 size;

} __attribute__((__packed__));



struct uhid_output_ev_req {

	__u16 type;

	__u16 code;

	__s32 value;

} __attribute__((__packed__));



struct uhid_event {

	__u32 type;



	union {

		struct uhid_create_req create;

		struct uhid_input_req input;

		struct uhid_output_ev_req output_ev;

	} u;

} __attribute__((__packed__));