path: root/drivers/input/mouse/synaptics.c
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authorMasaki Ota <masaki.ota@jp.alps.com>2017-08-24 15:44:36 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2017-08-24 15:53:46 -0700
commit4a646580f793d19717f7e034c8d473b509c27d49 (patch)
tree4f13471d5b2be6d0d84de45777833a95ddacbb3d /drivers/input/mouse/synaptics.c
parentInput: soc_button_array - silence -ENOENT error on Dell XPS13 9365 (diff)
Input: ALPS - fix two-finger scroll breakage in right side on ALPS touchpad
Fixed the issue that two finger scroll does not work correctly on V8 protocol. The cause is that V8 protocol X-coordinate decode is wrong at SS4 PLUS device. I added SS4 PLUS X decode definition. Mote notes: the problem manifests itself by the commit e7348396c6d5 ("Input: ALPS - fix V8+ protocol handling (73 03 28)"), where a fix for the V8+ protocol was applied. Although the culprit must have been present beforehand, the two-finger scroll worked casually even with the wrongly reported values by some reason. It got broken by the commit above just because it changed x_max value, and this made libinput correctly figuring the MT events. Since the X coord is reported as falsely doubled, the events on the right-half side go outside the boundary, thus they are no longer handled. This resulted as a broken two-finger scroll. One finger event is decoded differently, and it didn't suffer from this problem. The problem was only about MT events. --tiwai Fixes: e7348396c6d5 ("Input: ALPS - fix V8+ protocol handling (73 03 28)") Signed-off-by: Masaki Ota <masaki.ota@jp.alps.com> Tested-by: Takashi Iwai <tiwai@suse.de> Tested-by: Paul Donohue <linux-kernel@PaulSD.com> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input/mouse/synaptics.c')
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