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Input: joydev - extend absolute mouse detection 

Extend event signature matching to catch more input devices emulated by
BMC firmwares, QEMU and VMware.

Signed-off-by: Alexander Tsoy <alexander@tsoy.me>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Alexander Tsoy 2019-06-30 00:32:00 -07:00 committed by Dmitry Torokhov
parent d69f62bed7
commit 8d3c60c768
1 changed files with 22 additions and 2 deletions
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24
drivers/input/joydev.c
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@ -812,6 +812,7 @@ static bool joydev_dev_is_blacklisted(struct input_dev *dev)
static bool joydev_dev_is_absolute_mouse(struct input_dev *dev)
{
DECLARE_BITMAP(jd_scratch, KEY_CNT);
bool ev_match = false;
BUILD_BUG_ON(ABS_CNT > KEY_CNT || EV_CNT > KEY_CNT);
@ -830,17 +831,36 @@ static bool joydev_dev_is_absolute_mouse(struct input_dev *dev)
* considered to be an absolute mouse if the following is
* true:
*
* 1) Event types are exactly EV_ABS, EV_KEY and EV_SYN.
* 1) Event types are exactly
* EV_ABS, EV_KEY and EV_SYN
* or
* EV_ABS, EV_KEY, EV_SYN and EV_MSC
* or
* EV_ABS, EV_KEY, EV_SYN, EV_MSC and EV_REL.
* 2) Absolute events are exactly ABS_X and ABS_Y.
* 3) Keys are exactly BTN_LEFT, BTN_RIGHT and BTN_MIDDLE.
* 4) Device is not on "Amiga" bus.
*/
bitmap_zero(jd_scratch, EV_CNT);
/* VMware VMMouse, HP ILO2 */
__set_bit(EV_ABS, jd_scratch);
__set_bit(EV_KEY, jd_scratch);
__set_bit(EV_SYN, jd_scratch);
if (!bitmap_equal(jd_scratch, dev->evbit, EV_CNT))
if (bitmap_equal(jd_scratch, dev->evbit, EV_CNT))
ev_match = true;
/* HP ILO2, AMI BMC firmware */
__set_bit(EV_MSC, jd_scratch);
if (bitmap_equal(jd_scratch, dev->evbit, EV_CNT))
ev_match = true;
/* VMware Virtual USB Mouse, QEMU USB Tablet, ATEN BMC firmware */
__set_bit(EV_REL, jd_scratch);
if (bitmap_equal(jd_scratch, dev->evbit, EV_CNT))
ev_match = true;
if (!ev_match)
return false;
bitmap_zero(jd_scratch, ABS_CNT);