[PATCH v2 01/15] HID: logitech-dj: allow devices to request full pairing information

Benjamin Tissoires
2017-02-02T14:12:58Z

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>

---

no changes in v2
---
drivers/hid/hid-logitech-dj.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c
index 5bc6d80..71ce4ca 100644
--- a/drivers/hid/hid-logitech-dj.c
+++ b/drivers/hid/hid-logitech-dj.c
@@ -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,
@@ -712,8 +716,8 @@ 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)))
+ if (count == 7 && !memcmp(buf, unifying_pairing_query,
+ sizeof(unifying_pairing_query)))
buf[4] |= djdev->device_index - 1;
else
buf[1] = djdev->device_index;
@@ -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;
--
2.9.3