55 lines
2.1 KiB
ReStructuredText
55 lines
2.1 KiB
ReStructuredText
EDT ft5x06 based Polytouch devices
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The edt-ft5x06 driver is useful for the EDT "Polytouch" family of capacitive
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touch screens. Note that it is *not* suitable for other devices based on the
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focaltec ft5x06 devices, since they contain vendor-specific firmware. In
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particular this driver is not suitable for the Nook tablet.
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It has been tested with the following devices:
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* EP0350M06
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* EP0430M06
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* EP0570M06
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* EP0700M06
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The driver allows configuration of the touch screen via a set of sysfs files:
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/sys/class/input/eventX/device/device/threshold:
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allows setting the "click"-threshold in the range from 0 to 80.
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/sys/class/input/eventX/device/device/gain:
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allows setting the sensitivity in the range from 0 to 31. Note that
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lower values indicate higher sensitivity.
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/sys/class/input/eventX/device/device/offset:
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allows setting the edge compensation in the range from 0 to 31.
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/sys/class/input/eventX/device/device/report_rate:
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allows setting the report rate in the range from 3 to 14.
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For debugging purposes the driver provides a few files in the debug
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filesystem (if available in the kernel). In /sys/kernel/debug/edt_ft5x06
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you'll find the following files:
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num_x, num_y:
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(readonly) contains the number of sensor fields in X- and
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Y-direction.
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mode:
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allows switching the sensor between "factory mode" and "operation
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mode" by writing "1" or "0" to it. In factory mode (1) it is
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possible to get the raw data from the sensor. Note that in factory
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mode regular events don't get delivered and the options described
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above are unavailable.
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raw_data:
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contains num_x * num_y big endian 16 bit values describing the raw
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values for each sensor field. Note that each read() call on this
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files triggers a new readout. It is recommended to provide a buffer
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big enough to contain num_x * num_y * 2 bytes.
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Note that reading raw_data gives a I/O error when the device is not in factory
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mode. The same happens when reading/writing to the parameter files when the
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device is not in regular operation mode.
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