HID: uhid: allow feeding input data into uhid devices

This adds a new event type UHID_INPUT which allows user-space to feed raw
HID reports into the HID subsystem. We copy the data into kernel memory
and directly feed it into the HID core.

There is no error handling of the events couldn't be parsed so user-space
should consider all events successfull unless read() returns an error.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/uhid.h b/include/linux/uhid.h
index 8a493e6..6eb42be 100644
--- a/include/linux/uhid.h
+++ b/include/linux/uhid.h
@@ -25,6 +25,7 @@
 enum uhid_event_type {
 	UHID_CREATE,
 	UHID_DESTROY,
+	UHID_INPUT,
 };
 
 struct uhid_create_req {
@@ -41,11 +42,19 @@ struct uhid_create_req {
 	__u32 country;
 } __attribute__((__packed__));
 
+#define UHID_DATA_MAX 4096
+
+struct uhid_input_req {
+	__u8 data[UHID_DATA_MAX];
+	__u16 size;
+} __attribute__((__packed__));
+
 struct uhid_event {
 	__u32 type;
 
 	union {
 		struct uhid_create_req create;
+		struct uhid_input_req input;
 	} u;
 } __attribute__((__packed__));