1 What: /sys/bus/iio/devices/iio:devic 1 What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_agc_gain
2 What: /sys/bus/iio/devices/iio:devic 2 What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_agc_gain_bias
3 KernelVersion: 4.18 3 KernelVersion: 4.18
4 Contact: linux-iio@vger.kernel.org 4 Contact: linux-iio@vger.kernel.org
5 Description: 5 Description:
6 This sensor has an automatic g 6 This sensor has an automatic gain control (agc) loop
7 which sets the analog signal l 7 which sets the analog signal levels at an optimum
8 level by controlling programma 8 level by controlling programmable gain amplifiers. The
9 criteria for optimal gain is d 9 criteria for optimal gain is determined by the sensor.
10 10
11 Return the actual gain value a 11 Return the actual gain value as an integer in [0; 65536]
12 range when read from. 12 range when read from.
13 13
14 The agc gain read when measuri 14 The agc gain read when measuring crosstalk shall be
15 written into in_proximity0_agc 15 written into in_proximity0_agc_gain_bias.
16 16
17 What: /sys/bus/iio/devices/iio:devic 17 What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_temp_a
18 What: /sys/bus/iio/devices/iio:devic 18 What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_temp_b
19 What: /sys/bus/iio/devices/iio:devic 19 What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_light_a
20 What: /sys/bus/iio/devices/iio:devic 20 What: /sys/bus/iio/devices/iio:deviceX/in_proximity0_calib_phase_light_b
21 KernelVersion: 4.18 21 KernelVersion: 4.18
22 Contact: linux-iio@vger.kernel.org 22 Contact: linux-iio@vger.kernel.org
23 Description: 23 Description:
24 The sensor is able to perform 24 The sensor is able to perform correction of distance
25 measurements due to changing t 25 measurements due to changing temperature and ambient
26 light conditions. It can be pr 26 light conditions. It can be programmed to correct for
27 a second order error polynomia 27 a second order error polynomial.
28 28
29 Phase data has to be collected 29 Phase data has to be collected when temperature and
30 ambient light are modulated in 30 ambient light are modulated independently.
31 31
32 Then a least squares curve fit 32 Then a least squares curve fit to a second order
33 polynomial has to be generated 33 polynomial has to be generated from the data. The
34 resultant curves have the form 34 resultant curves have the form ax^2 + bx + c.
35 35
36 From those two curves, a and b 36 From those two curves, a and b coefficients shall be
37 stored in in_proximity0_calib_ 37 stored in in_proximity0_calib_phase_temp_a and
38 in_proximity0_calib_phase_temp 38 in_proximity0_calib_phase_temp_b for temperature and
39 in in_proximity0_calib_phase_l 39 in in_proximity0_calib_phase_light_a and
40 in_proximity0_calib_phase_ligh 40 in_proximity0_calib_phase_light_b for ambient light.
41 41
42 Those values must be integer i 42 Those values must be integer in [0; 8355840] range.
43 43
44 Finally, the c constant is set 44 Finally, the c constant is set by the sensor
45 internally. 45 internally.
46 46
47 The value stored in sensor is 47 The value stored in sensor is displayed when read from.
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