| What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_agc_gain |
| What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_agc_gain_bias |
| KernelVersion: 4.18 |
| Contact: linux-iio@vger.kernel.org |
| Description: |
| This sensor has an automatic gain control (agc) loop |
| which sets the analog signal levels at an optimum |
| level by controlling programmable gain amplifiers. The |
| criteria for optimal gain is determined by the sensor. |
| |
| Return the actual gain value as an integer in [0; 65536] |
| range when read from. |
| |
| The agc gain read when measuring crosstalk shall be |
| written into in_proximity0_agc_gain_bias. |
| |
| What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_temp_a |
| What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_temp_b |
| What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_light_a |
| What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_light_b |
| KernelVersion: 4.18 |
| Contact: linux-iio@vger.kernel.org |
| Description: |
| The sensor is able to perform correction of distance |
| measurements due to changing temperature and ambient |
| light conditions. It can be programmed to correct for |
| a second order error polynomial. |
| |
| Phase data has to be collected when temperature and |
| ambient light are modulated independently. |
| |
| Then a least squares curve fit to a second order |
| polynomial has to be generated from the data. The |
| resultant curves have the form ax^2 + bx + c. |
| |
| From those two curves, a and b coefficients shall be |
| stored in in_proximity0_calib_phase_temp_a and |
| in_proximity0_calib_phase_temp_b for temperature and |
| in in_proximity0_calib_phase_light_a and |
| in_proximity0_calib_phase_light_b for ambient light. |
| |
| Those values must be integer in [0; 8355840] range. |
| |
| Finally, the c constant is set by the sensor |
| internally. |
| |
| The value stored in sensor is displayed when read from. |
