Determining if a device is a touchscreen device in linux

I am trying to determine what /dev/input/eventX device is the touchScreen. I am currently looking at the return of EVIOCGNAME to get device name. Looking at the return values of the EVIOCGBIT ioctl I don't think there is a generic way to determine what i开发者_如何学JAVAs the touchscreen. I am interested in any sort of solution to this problem. Thanks in advance for your time!!!

Take a look at:

• /dev/input/by-path/
• /dev/input/by-id/
• /sys/class/input/event?/device/

These might have enough info for your needs. Wish I had a touchscreen to test ;)

If the mask returned by ioctl(EV_ABS) contains ABS_PRESSURE, and ioctl(EV_KEY) contains BTN_TOOL_FINGER, then it's probably a touchscreen.