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HID: uhid: implement SET_REPORT

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We so far lacked support for hid_hw_raw_request(..., HID_REQ_SET_REPORT);
Add support for it and simply forward the request to user-space. Note that
SET_REPORT is synchronous, just like GET_REPORT, even though it does not
provide any data back besides an error code.

If a transport layer does SET_REPORT asynchronously, they can just ACK it
immediately by writing an uhid_set_report_reply to uhid.

This patch re-uses the synchronous uhid-report infrastructure to query
user-space. Note that this means you cannot run SET_REPORT and GET_REPORT
in parallel. However, that has always been a restriction of HID and due to
its blocking nature, this is just fine. Maybe some future transport layer
supports parallel requests (very unlikely), however, until then lets not
over-complicate things and avoid request-lookup-tables.

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 17:14:24 +02:00 • committed by Jiri Kosina
parent 7c4003bc36
commit 11c2215530
2 changed files with 162 additions and 75 deletions
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17
include/uapi/linux/uhid.h
View file

@ -37,6 +37,8 @@ enum uhid_event_type {
UHID_GET_REPORT_REPLY,
UHID_CREATE2,
UHID_INPUT2,
UHID_SET_REPORT,
UHID_SET_REPORT_REPLY,
};
struct uhid_create2_req {
@ -84,6 +86,19 @@ struct uhid_get_report_reply_req {
__u8 data[UHID_DATA_MAX];
} __attribute__((__packed__));
struct uhid_set_report_req {
__u32 id;
__u8 rnum;
__u8 rtype;
__u16 size;
__u8 data[UHID_DATA_MAX];
} __attribute__((__packed__));
struct uhid_set_report_reply_req {
__u32 id;
__u16 err;
} __attribute__((__packed__));
/*
* Compat Layer
* All these commands and requests are obsolete. You should avoid using them in
@ -165,6 +180,8 @@ struct uhid_event {
struct uhid_get_report_reply_req get_report_reply;
struct uhid_create2_req create2;
struct uhid_input2_req input2;
struct uhid_set_report_req set_report;
struct uhid_set_report_reply_req set_report_reply;
} u;
} __attribute__((__packed__));