[SRU][B/OEM-B/D/OEM-OSP1-B/E][PATCH v2 0/2] input/mouse: alps trackpoint-only device doesn't work

[Hui Wang]

BugLink: https://bugs.launchpad.net/bugs/1836752

In the V2:
I added one more patch (0002) to fix the problem of condition checking
of 0x20~0x2f (apw found this problem in the v1)

Since the OEM-OSP1-B already merged 0001, it only needs to merge 0002
this time, for the rest of kernel version, need to merge 0001 and 0002.

[Impact]
On one of the latest Lenovo laptops, the trackpoint doesn't work, we
consulted apls guys, they said this trackpoint is different from others,
it is a trackpoint-only device, so the current alps.c doesn't support it
well, while the trackpoint.c can drive it well.

[Fix]
Check if it is trakcpoint-only device, if it yes, let trackpoint.c
handle it.

[Test Case]
apply this patch and boot with the kernel, the trackpoint can work
well.

[Regression Risk]
Low. the way of detect trackpoint-only alps device is provided by
alps. so it is pretty safe. and I have tested the patch on two
lenovo machines with alsp touchpad+trackpoint device, they worked
well.


Hui Wang (2):
  Input: alps - don't handle ALPS cs19 trackpoint-only device
  Input: alps - fix a mismatch between a condition check and its comment

 drivers/input/mouse/alps.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

-- 
2.17.1