projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 43c4d13e SB |
1 | EDT ft5x06 based Polytouch devices |
| 2 | ---------------------------------- | |
| 3 | ||
| 4 | The edt-ft5x06 driver is useful for the EDT "Polytouch" family of capacitive | |
| 5 | touch screens. Note that it is *not* suitable for other devices based on the | |
| 6 | focaltec ft5x06 devices, since they contain vendor-specific firmware. In | |
| 7 | particular this driver is not suitable for the Nook tablet. | |
| 8 | ||
| 9 | It has been tested with the following devices: | |
| 10 | * EP0350M06 | |
| 11 | * EP0430M06 | |
| 12 | * EP0570M06 | |
| 13 | * EP0700M06 | |
| 14 | ||
| 15 | The 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 | ||
| 31 | For debugging purposes the driver provides a few files in the debug | |
| 32 | filesystem (if available in the kernel). In /sys/kernel/debug/edt_ft5x06 | |
| 33 | you'll find the following files: | |
| 34 | ||
| 35 | num_x, num_y: | |
| 36 | (readonly) contains the number of sensor fields in X- and | |
| 37 | Y-direction. | |
| 38 | ||
| 39 | mode: | |
| 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 | ||
| 46 | raw_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 | ||
| 52 | Note that reading raw_data gives a I/O error when the device is not in factory | |
| 53 | mode. The same happens when reading/writing to the parameter files when the | |
| 54 | device is not in regular operation mode. |