linux-kernel - [ 31/82] HID: clean up quirk for Sony RF receivers

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Message-Id: <20130318042147.339105936@decadent.org.uk>
Date:	Mon, 18 Mar 2013 04:22:15 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org,
	Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>,
	Jiri Kosina <jkosina@...e.cz>
Subject: [ 31/82] HID: clean up quirk for Sony RF receivers

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Fernando Luis Vázquez Cao <fernando_b1@....ntt.co.jp>

commit 99d249021abd4341771523ed8dd7946276103432 upstream.

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@...r.kernel.org
Cc: linux-usb@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/hid/hid-sony.c |   14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

--- a/drivers/hid/hid-sony.c
+++ b/drivers/hid/hid-sony.c
@@ -44,9 +44,19 @@ static __u8 *sony_report_fixup(struct hi
 {
 	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;
 	}
 


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