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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 <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
This commit is contained in:
David Herrmann 2014-07-29 17:14:25 +02:00 • committed by Jiri Kosina
commit c2b2f16c5c
2 changed files with 31 additions and 1 deletions
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21
drivers/hid/uhid.c
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@ -92,8 +92,27 @@ static int uhid_queue_event(struct uhid_device *uhid, __u32 event)
static int uhid_hid_start(struct hid_device *hid)
{
struct uhid_device *uhid = hid->driver_data;
struct uhid_event *ev;
unsigned long flags;
return uhid_queue_event(uhid, UHID_START);
ev = kzalloc(sizeof(*ev), GFP_KERNEL);
if (!ev)
return -ENOMEM;
ev->type = UHID_START;
if (hid->report_enum[HID_FEATURE_REPORT].numbered)
ev->u.start.dev_flags |= UHID_DEV_NUMBERED_FEATURE_REPORTS;
if (hid->report_enum[HID_OUTPUT_REPORT].numbered)
ev->u.start.dev_flags |= UHID_DEV_NUMBERED_OUTPUT_REPORTS;
if (hid->report_enum[HID_INPUT_REPORT].numbered)
ev->u.start.dev_flags |= UHID_DEV_NUMBERED_INPUT_REPORTS;
spin_lock_irqsave(&uhid->qlock, flags);
uhid_queue(uhid, ev);
spin_unlock_irqrestore(&uhid->qlock, flags);
return 0;
}
static void uhid_hid_stop(struct hid_device *hid)