PixArt Imaging PAT9125 is a miniature low power optical navigation chip using LASER light source enabling digital surface tracking. This device driver use IIO API to provide punctual and/or buffered data. The data is a relative position from where start the device on X and Y axis, depend on CPI (Counts Per Inch) resolution setting chosen. The device support CPI configuration through IIO interface. This patchset : - Update vendor prefix - Add the bindings for this device - Add the device driver - Add directory for optical tracker devices Change since v3: - Replace delta value by relative position - Improve write protected reg function by removing print log and obvious returns - Handle error in postenable buffer function Change since v2: - Fix typo - Add constructor webpage and datasheet in commit message - Use BIT() macro for define bit mask - Remove shift from IIO channel spec structure - Replace IIO_LE by IIO_CPU from IIO channel spec structure - Replace memcpy() by cast (s32) - Rename "pat9125_trig_try_reen" to "pat9125_trig_try_reenable" - Add carriage return (\n) at the end of each "dev_err" function - Remove "iio_trigger_unregister" in case of "iio_trigger_register" fail, register function already manage it - Remove log which print device name in case of successful initialization - Fix enabled IRQ flag warning during nested IRQ thread - Improve retry algo now based on status register - Remove "ts", "motion_detected" and "buffer_mode" from pat9125_data structure - Rename all "ot" directories to "position" - Polling sample through IIO_CHAN_INFO_RAW now return position value (relative to the position at initialization time) instead of delta position - Clean iio_buffer_setup_ops structure by removing NULL pointer. - Use devm_iio_ function for all init functions and then delete "pat9125_remove" - Move device_register at the end of probe function - Replace MODULE_PARM_DESC by IIO_SCALE to set axis resolution (CPI) Change since v1: - Fix typo - Rename some defines / variables - Remove I2C client from driver structure - Change type of delta_x and delta_y from s16 to s32 to simplify signed operations - Add module parameter for axis resolution - Replace "IIO_MOD_X_AND_Y" by "IIO_MOD_X" and "IIO_MOD_Y" - Add sign extension macro - Improve read value algorithm to avoid data loss - Implement a trigger handler function which can work with any IIO trigger, independently of it own GPIO IRQ, to match with IIO requirement/behaviour - Replace iio push event function by iio trigger poll in GPIO IRQ handler - Use triggered_buffer helpers to replace kfifo use, setup buffer, implement enable/disable setup buffer operations, IIO trigger allocation and re-enable operations - Remove useless "goto" - Change GPIO IRQ handler from planified thread to IRQ thread - Change GPIO IRQ trigger from low level and one shot to falling edge - Add device unregister and buffer cleanup to driver remove function Alexandre Mergnat (3): dt-bindings: Add pixart vendor dt-bindings: iio: position: Add docs pat9125 iio: Add PAT9125 optical tracker sensor .../bindings/iio/position/pat9125.txt | 18 + .../devicetree/bindings/vendor-prefixes.yaml | 2 + drivers/iio/Kconfig | 1 + drivers/iio/Makefile | 1 + drivers/iio/position/Kconfig | 18 + drivers/iio/position/Makefile | 6 + drivers/iio/position/pat9125.c | 506 ++++++++++++++++++ 7 files changed, 552 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/position/pat9125.txt create mode 100644 drivers/iio/position/Kconfig create mode 100644 drivers/iio/position/Makefile create mode 100644 drivers/iio/position/pat9125.c -- 2.17.1
