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HID: clean up quirk for Sony RF receivers

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commit 99d249021a 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@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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Fernando Luis Vazquez Cao 2013-01-22 15:20:38 +09:00 committed by Greg Kroah-Hartman
parent 8d49f9035f
commit 7d02a653f1
1 changed files with 12 additions and 2 deletions
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14
drivers/hid/hid-sony.c
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@ -44,9 +44,19 @@ 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;
}