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HID: uhid: Add UHID_CREATE2 + UHID_INPUT2

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UHID_CREATE2:
HID report descriptor data (rd_data) is an array in struct uhid_create2_req,
instead of a pointer. Enables use from languages that don't support pointers,
e.g. Python.

UHID_INPUT2:
Data array is the last field of struct uhid_input2_req. Enables userspace to
write only the required bytes to kernel (ev.type + ev.u.input2.size + the part
of the data array that matters), instead of the entire struct uhid_input2_req.

Note:
UHID_CREATE2 increases the total size of struct uhid_event slightly, thus
increasing the size of messages that are queued for userspace. However, this
won't affect the userspace processing of these events.

[Jiri Kosina <jkosina@suse.cz>: adjust to hid_get_raw_report() and
				hid_output_raw_report() API changes]

Signed-off-by: Petri Gynther <pgynther@google.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Petri Gynther 2014-03-24 13:50:01 -07:00 • committed by Jiri Kosina
parent c3d77fab51
commit 4522643aa9
3 changed files with 112 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

23
include/uapi/linux/uhid.h
View file

@ -21,6 +21,7 @@
#include <linux/input.h>
#include <linux/types.h>
#include <linux/hid.h>
enum uhid_event_type {
UHID_CREATE,
@ -34,6 +35,8 @@ enum uhid_event_type {
UHID_INPUT,
UHID_FEATURE,
UHID_FEATURE_ANSWER,
UHID_CREATE2,
UHID_INPUT2,
};
struct uhid_create_req {
@ -50,6 +53,19 @@ struct uhid_create_req {
__u32 country;
} __attribute__((__packed__));
struct uhid_create2_req {
__u8 name[128];
__u8 phys[64];
__u8 uniq[64];
__u16 rd_size;
__u16 bus;
__u32 vendor;
__u32 product;
__u32 version;
__u32 country;
__u8 rd_data[HID_MAX_DESCRIPTOR_SIZE];
} __attribute__((__packed__));
#define UHID_DATA_MAX 4096
enum uhid_report_type {
@ -63,6 +79,11 @@ struct uhid_input_req {
__u16 size;
} __attribute__((__packed__));
struct uhid_input2_req {
__u16 size;
__u8 data[UHID_DATA_MAX];
} __attribute__((__packed__));
struct uhid_output_req {
__u8 data[UHID_DATA_MAX];
__u16 size;
@ -100,6 +121,8 @@ struct uhid_event {
struct uhid_output_ev_req output_ev;
struct uhid_feature_req feature;
struct uhid_feature_answer_req feature_answer;
struct uhid_create2_req create2;
struct uhid_input2_req input2;
} u;
} __attribute__((__packed__));