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HID: logitech-dj: allow devices to request full pairing information

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Register 0xB5 should be handled specially no matter what function is
used. This allows to retrieve the serial and the Quad ID from
hid-logitech-hidpp directly.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Tested-by: Bastien Nocera <hadess@hadess.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Benjamin Tissoires 2017-03-27 16:59:21 +02:00 committed by Jiri Kosina
parent 351744aa0f
commit 8dba3026d5
1 changed files with 11 additions and 8 deletions
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19
drivers/hid/hid-logitech-dj.c
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@ -692,8 +692,12 @@ static void logi_dj_ll_close(struct hid_device *hid)
dbg_hid("%s:%s\n", __func__, hid->phys);
}
static u8 unifying_name_query[] = {0x10, 0xff, 0x83, 0xb5, 0x40, 0x00, 0x00};
static u8 unifying_name_answer[] = {0x11, 0xff, 0x83, 0xb5};
/*
* Register 0xB5 is "pairing information". It is solely intended for the
* receiver, so do not overwrite the device index.
*/
static u8 unifying_pairing_query[] = {0x10, 0xff, 0x83, 0xb5};
static u8 unifying_pairing_answer[] = {0x11, 0xff, 0x83, 0xb5};
static int logi_dj_ll_raw_request(struct hid_device *hid,
unsigned char reportnum, __u8 *buf,
@ -712,9 +716,9 @@ static int logi_dj_ll_raw_request(struct hid_device *hid,
/* special case where we should not overwrite
* the device_index */
if (count == 7 && !memcmp(buf, unifying_name_query,
sizeof(unifying_name_query)))
buf[4] |= djdev->device_index - 1;
if (count == 7 && !memcmp(buf, unifying_pairing_query,
sizeof(unifying_pairing_query)))
buf[4] = (buf[4] & 0xf0) | (djdev->device_index - 1);
else
buf[1] = djdev->device_index;
return hid_hw_raw_request(djrcv_dev->hdev, reportnum, buf,
@ -911,9 +915,8 @@ static int logi_dj_hidpp_event(struct hid_device *hdev,
/* special case were the device wants to know its unifying
* name */
if (size == HIDPP_REPORT_LONG_LENGTH &&
!memcmp(data, unifying_name_answer,
sizeof(unifying_name_answer)) &&
((data[4] & 0xF0) == 0x40))
!memcmp(data, unifying_pairing_answer,
sizeof(unifying_pairing_answer)))
device_index = (data[4] & 0x0F) + 1;
else
return false;