55 lines · plain
1EDT ft5x06 based Polytouch devices2----------------------------------3 4The edt-ft5x06 driver is useful for the EDT "Polytouch" family of capacitive5touch screens. Note that it is *not* suitable for other devices based on the6focaltec ft5x06 devices, since they contain vendor-specific firmware. In7particular this driver is not suitable for the Nook tablet.8 9It has been tested with the following devices:10 * EP0350M0611 * EP0430M0612 * EP0570M0613 * EP0700M0614 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 0 to 80.19 20/sys/class/input/eventX/device/device/gain:21 allows setting the sensitivity in the range from 0 to 31. Note that22 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 debug32filesystem (if available in the kernel). In /sys/kernel/debug/edt_ft5x0633you'll find the following files:34 35num_x, num_y:36 (readonly) contains the number of sensor fields in X- and37 Y-direction.38 39mode:40 allows switching the sensor between "factory mode" and "operation41 mode" by writing "1" or "0" to it. In factory mode (1) it is42 possible to get the raw data from the sensor. Note that in factory43 mode regular events don't get delivered and the options described44 above are unavailable.45 46raw_data:47 contains num_x * num_y big endian 16 bit values describing the raw48 values for each sensor field. Note that each read() call on this49 files triggers a new readout. It is recommended to provide a buffer50 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 factory53mode. The same happens when reading/writing to the parameter files when the54device is not in regular operation mode.55