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mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-25 05:34:00 +08:00
linux-next/drivers/input
Benjamin Tissoires d2d13f18aa Input: wacom - create a separate input device for pads
Currently, the pad events are sent through the stylus input device
for the Intuos/Cintiqs, and through the touch input device for the
Bamboos.

To differentiate the buttons pressed on the pad from the ones pressed
on the stylus, the Intuos/Cintiq uses MISC_SERIAL and ABS_MISC. This
lead to a multiplexing of the events into one device, which are then
splitted out in xf86-input-wacom. Bamboos are not using MISC events
because the pad is attached to the touch interface, and only BTN_TOUCH
is used for the finger (and DOUBLE_TAP, etc...). However, the user space
driver still splits out the pad from the touch interface in the same
way it does for the pro line devices.

The other problem we can see with this fact is that some of the Intuos
and Cintiq have a wheel, and the effective range of the reported values
is [0..71]. Unfortunately, the airbrush stylus also sends wheel events
(there is a small wheel on it), but in the range [0..1023]. From the user
space point of view it is kind of difficult to understand that because
the wheel on the pad are quite common, while the airbrush tool is not.

A solution to fix all of these problems is to split out the pad device
from the stylus/touch. This decision makes more sense because the pad is
not linked to the absolute position of the finger or pen, and usually, the
events from the pad are filtered out by the compositor, which then convert
them into actions or keyboard shortcuts.

For backward compatibility with current xf86-input-wacom, the pad devices
still present the ABS_X, ABS_Y and ABS_MISC events, but they can be
completely ignored in the new implementation.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Ping Cheng <pingc@wacom.com>
Reviewed-by: Jason Gerecke <killertofu@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2014-07-25 18:53:46 -07:00
..
gameport Input: delete non-required instances of include <linux/init.h> 2014-01-06 23:23:57 -08:00
joystick Merge branch 'next' into for-linus 2014-01-23 08:10:44 -08:00
keyboard Merge branch 'next' into for-linus 2014-06-07 23:24:07 -07:00
misc Input: max8997_haptic - add error handling for regulator and pwm 2014-06-07 23:20:24 -07:00
mouse Merge branch 'next' into for-linus 2014-06-07 23:24:07 -07:00
serio Merge branch 'next' into for-linus 2014-06-07 23:24:07 -07:00
tablet Input: wacom - create a separate input device for pads 2014-07-25 18:53:46 -07:00
touchscreen Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2014-06-09 18:46:02 -07:00
apm-power.c Input: random formatting fixes 2012-08-21 22:29:49 -07:00
evbug.c
evdev.c Linux 3.15-rc5 2014-05-14 16:49:19 -07:00
ff-core.c Input: random formatting fixes 2012-08-21 22:29:49 -07:00
ff-memless.c Input: random formatting fixes 2012-08-21 22:29:49 -07:00
input-compat.c compat: Use COMPAT_USE_64BIT_TIME in the input subsystem 2012-02-20 12:48:47 -08:00
input-compat.h compat: Use COMPAT_USE_64BIT_TIME in the input subsystem 2012-02-20 12:48:47 -08:00
input-mt.c Input: MT - handle semi-mt devices in core 2013-04-07 21:02:32 -07:00
input-polldev.c Input: implement managed polled input devices 2014-05-14 16:40:04 -07:00
input.c Merge branch 'next' into for-linus 2014-01-23 08:10:44 -08:00
joydev.c Input: fix use-after-free introduced with dynamic minor changes 2012-10-22 08:50:37 +03:00
Kconfig Input: mousedev - allow disabling even without CONFIG_EXPERT 2013-10-31 08:46:07 -07:00
Makefile Input: matrix-keymap - uninline and prepare for device tree support 2012-05-10 22:38:47 -07:00
matrix-keymap.c input: Export matrix_keypad_parse_of_params() 2013-04-19 00:31:13 +02:00
mousedev.c Input: mousedev - fix race when creating mixed device 2014-03-29 14:44:23 -07:00
sparse-keymap.c treewide: Fix typo in Documentation/DocBook 2014-02-19 14:58:17 +01:00