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HID: uhid: report to user-space whether reports are numbered

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This makes UHID_START include a "dev_flags" field that describes details
of the hid-device in the kernel. The first flags we introduce describe
whether a given report-type uses numbered reports. This is useful for
transport layers that force report-numbers and therefore might have to
prefix kernel-provided HID-messages with the report-number.

Currently, only HoG needs this and the spec only talks about "global
report numbers". That is, it's a global boolean not a per-type boolean.
However, given the quirks we already have in kernel-space, a per-type
value seems much more appropriate.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
David Herrmann
2014-07-29 17:14:25 +02:00
committed by Jiri Kosina
parent 11c2215530
commit c2b2f16c5c
2 changed files with 31 additions and 1 deletions
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11
include/uapi/linux/uhid.h
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@@ -54,6 +54,16 @@ struct uhid_create2_req {
__u8 rd_data[HID_MAX_DESCRIPTOR_SIZE];
} __attribute__((__packed__));
enum uhid_dev_flag {
UHID_DEV_NUMBERED_FEATURE_REPORTS = (1ULL << 0),
UHID_DEV_NUMBERED_OUTPUT_REPORTS = (1ULL << 1),
UHID_DEV_NUMBERED_INPUT_REPORTS = (1ULL << 2),
};
struct uhid_start_req {
__u64 dev_flags;
};
#define UHID_DATA_MAX 4096
enum uhid_report_type {
@@ -182,6 +192,7 @@ struct uhid_event {
struct uhid_input2_req input2;
struct uhid_set_report_req set_report;
struct uhid_set_report_reply_req set_report_reply;
struct uhid_start_req start;
} u;
} __attribute__((__packed__));