linux/Documentation/input/edt-ft5x06.txt
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   1EDT ft5x06 based Polytouch devices
   2----------------------------------
   3
   4The edt-ft5x06 driver is useful for the EDT "Polytouch" family of capacitive
   5touch screens. Note that it is *not* suitable for other devices based on the
   6focaltec ft5x06 devices, since they contain vendor-specific firmware. In
   7particular this driver is not suitable for the Nook tablet.
   8
   9It has been tested with the following devices:
  10  * EP0350M06
  11  * EP0430M06
  12  * EP0570M06
  13  * EP0700M06
  14
  15The driver allows configuration of the touch screen via a set of sysfs files:
  16
  17/sys/class/input/eventX/device/device/threshold:
  18    allows setting the "click"-threshold in the range from 20 to 80.
  19
  20/sys/class/input/eventX/device/device/gain:
  21    allows setting the sensitivity in the range from 0 to 31. Note that
  22    lower values indicate higher sensitivity.
  23
  24/sys/class/input/eventX/device/device/offset:
  25    allows setting the edge compensation in the range from 0 to 31.
  26
  27/sys/class/input/eventX/device/device/report_rate:
  28    allows setting the report rate in the range from 3 to 14.
  29
  30
  31For debugging purposes the driver provides a few files in the debug
  32filesystem (if available in the kernel). In /sys/kernel/debug/edt_ft5x06
  33you'll find the following files:
  34
  35num_x, num_y:
  36    (readonly) contains the number of sensor fields in X- and
  37    Y-direction.
  38
  39mode:
  40    allows switching the sensor between "factory mode" and "operation
  41    mode" by writing "1" or "0" to it. In factory mode (1) it is
  42    possible to get the raw data from the sensor. Note that in factory
  43    mode regular events don't get delivered and the options described
  44    above are unavailable.
  45
  46raw_data:
  47    contains num_x * num_y big endian 16 bit values describing the raw
  48    values for each sensor field. Note that each read() call on this
  49    files triggers a new readout. It is recommended to provide a buffer
  50    big enough to contain num_x * num_y * 2 bytes.
  51
  52Note that reading raw_data gives a I/O error when the device is not in factory
  53mode. The same happens when reading/writing to the parameter files when the
  54device is not in regular operation mode.
  55
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