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Commit 8d3c60c7 authored by Alexander Tsoy's avatar Alexander Tsoy Committed by Dmitry Torokhov
Browse files

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: default avatarAlexander Tsoy <alexander@tsoy.me>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent d69f62be

drivers/input/joydev.c

+22 −2
Original line number Diff line number Diff line
@@ -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);