Yocto BSP X11 multitouch support

[ivannikolaenko]

Hi everybody.

I have a problem with Cypress capacitive touchscreen with multitouch support. Cypress has provided me with Linux kernel driver, and now I got /dev/input/event0 device, but the cursor on the screen is not moving. I looked at the /var/log/Xorg.0.log file and found this entry:

[1609714.552] (II) config/udev: Adding input device cyttsp5_mt (/dev/input/event0)

[1609714.552] (II) No input driver specified, ignoring this device.

I built a xf86-input-mtev (as I described here: https://community.freescale.com/message/599520#599520​) and put it to the /usr/lib/xorg/modules/input, and added an entry to /etc/X11/xorg.conf:

Section "InputClass"

    Identifier              "internal-touchscreen"

    MatchIsTouchScreen      "on"

    Driver                  "mtev"

    Option                  "Ignore"                "off"

EndSection

Also I tried this:

Section "InputClass"

    Identifier          "touchscreen"

    MatchProduct        "cyttsp5_mt"

    MatchIsTouchScreen  "true"

    Driver  "mtev"

    Option  "Device"    "/dev/input/event0"

    Option  "Ignore"   "off"

    Option  "SwapAxes"      "0"

    Option  "CorePointer" "true"

EndSection

Some output from mtdev-test utility:

root@smartphone:~# mtdev-test /dev/input/event0

supported mt events:

   ABS_MT_SLOT

   ABS_MT_TOUCH_MAJOR

   ABS_MT_TOUCH_MINOR

   ABS_MT_ORIENTATION

   ABS_MT_POSITION_X

   ABS_MT_POSITION_Y

   ABS_MT_TOOL_TYPE

   ABS_MT_TRACKING_ID

   ABS_MT_PRESSURE

   ABS_MT_DISTANCE

01516038927b 00 3 0039 75

01516038927b 00 3 0035 415

01516038927b 00 3 0036 367

01516038927b 00 3 003a 26

01516038927b 00 3 0030 73

01516038927b 00 3 0031 73

01516038927b 00 0 0000 0

015160389297 00 3 0036 366

015160389297 00 0 0000 0

01516038929f 00 3 0036 365

01516038929f 00 0 0000 0

0151603892a7 00 3 0035 416

Please give me a direction to find a problem.
Thank you.
Best regards.

[sonic7676]

hi Ivan,

have you got slove this problem? I have meet the same issue on Cypress Cytma568 on Ubuntu... do you get the correct  multi-touch driver for it ? thanks.

[alejandrolozan1]

Hi,

As far as I know the touch sensing library in yocto does not support multitouch capabilities.

You will have to change the touch sensing driver to work for single touch. You may find useful the attached example, the FORCE_SINGLE_EVENT macro enables the single touch feature.

Best Regards,

Alejandro