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author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2015-07-20 20:08:17 +0300 |
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committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2015-07-20 20:08:17 +0300 |
commit | c57d5621d2f2dc238f4b9c4d00b2a54187a75445 (patch) | |
tree | ece13738a44545fb110e5d73adbf2625bc7a1ea6 /drivers/input/joydev.c | |
parent | 6ccfe64c770139675a080ee5029ded7d89d9ea0d (diff) | |
parent | 52721d9d3334c1cb1f76219a161084094ec634dc (diff) |
Merge tag 'v4.2-rc3' into next
Sync up with Linux 4.2-rc3 to bring in infrastructure (OF) pieces.
Diffstat (limited to 'drivers/input/joydev.c')
-rw-r--r-- | drivers/input/joydev.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/input/joydev.c b/drivers/input/joydev.c index 46862602a5f7..6cb5a3e5f9a1 100644 --- a/drivers/input/joydev.c +++ b/drivers/input/joydev.c @@ -747,6 +747,63 @@ static void joydev_cleanup(struct joydev *joydev) input_close_device(handle); } +static bool joydev_dev_is_absolute_mouse(struct input_dev *dev) +{ + DECLARE_BITMAP(jd_scratch, KEY_CNT); + + BUILD_BUG_ON(ABS_CNT > KEY_CNT || EV_CNT > KEY_CNT); + + /* + * Virtualization (VMware, etc) and remote management (HP + * ILO2) solutions use absolute coordinates for their virtual + * pointing devices so that there is one-to-one relationship + * between pointer position on the host screen and virtual + * guest screen, and so their mice use ABS_X, ABS_Y and 3 + * primary button events. This clashes with what joydev + * considers to be joysticks (a device with at minimum ABS_X + * axis). + * + * Here we are trying to separate absolute mice from + * joysticks. A device is, for joystick detection purposes, + * considered to be an absolute mouse if the following is + * true: + * + * 1) Event types are exactly EV_ABS, EV_KEY and EV_SYN. + * 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); + __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)) + return false; + + bitmap_zero(jd_scratch, ABS_CNT); + __set_bit(ABS_X, jd_scratch); + __set_bit(ABS_Y, jd_scratch); + if (!bitmap_equal(dev->absbit, jd_scratch, ABS_CNT)) + return false; + + bitmap_zero(jd_scratch, KEY_CNT); + __set_bit(BTN_LEFT, jd_scratch); + __set_bit(BTN_RIGHT, jd_scratch); + __set_bit(BTN_MIDDLE, jd_scratch); + + if (!bitmap_equal(dev->keybit, jd_scratch, KEY_CNT)) + return false; + + /* + * Amiga joystick (amijoy) historically uses left/middle/right + * button events. + */ + if (dev->id.bustype == BUS_AMIGA) + return false; + + return true; +} static bool joydev_match(struct input_handler *handler, struct input_dev *dev) { @@ -758,6 +815,10 @@ static bool joydev_match(struct input_handler *handler, struct input_dev *dev) if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_DIGI, dev->keybit)) return false; + /* Avoid absolute mice */ + if (joydev_dev_is_absolute_mouse(dev)) + return false; + return true; } |