HID: clean up quirk for Sony RF receivers

Document what the fix-up is does and make it more robust by ensuring
that it is only applied to the USB interface that corresponds to the
mouse (sony_report_fixup() is called once per interface during probing).

Cc: linux-input@vger.kernel.org
Cc: linux-usb@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 12 insertions, 2 deletions

diff --git a/drivers/hid/hid-sony.c b/drivers/hid/hid-sony.c
index 6d2d459e9a5a..9769c0030bcc 100644
--- a/drivers/hid/hid-sony.c
+++ b/drivers/hid/hid-sony.c
@@ -65,9 +65,19 @@ static __u8 *sony_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 {
         struct sony_sc *sc = hid_get_drvdata(hdev);
 
-        if ((sc->quirks & VAIO_RDESC_CONSTANT) &&
-                        *rsize >= 56 && rdesc[54] == 0x81 && rdesc[55] == 0x07) {
+        /*
+         * Some Sony RF receivers wrongly declare the mouse pointer as a
+         * a constant non-data variable.
+         */
+        if ((sc->quirks & VAIO_RDESC_CONSTANT) && *rsize >= 56 &&
+            /* usage page: generic desktop controls */
+            /* rdesc[0] == 0x05 && rdesc[1] == 0x01 && */
+            /* usage: mouse */
+            rdesc[2] == 0x09 && rdesc[3] == 0x02 &&
+            /* input (usage page for x,y axes): constant, variable, relative */
+            rdesc[54] == 0x81 && rdesc[55] == 0x07) {
                 hid_info(hdev, "Fixing up Sony RF Receiver report descriptor\n");
+                /* input: data, variable, relative */
                 rdesc[55] = 0x06;
         }