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Commit 1c287992 authored by Mathieu Othacehe's avatar Mathieu Othacehe Committed by Jonathan Cameron
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iio: light: isl29501: Add support for the ISL29501 ToF sensor. 



This patch adds support for the ISL29501 Time of Flight sensor.

Signed-off-by: default avatarMathieu Othacehe <m.othacehe@gmail.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent c73314e6

Documentation/ABI/testing/sysfs-bus-iio-isl29501

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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.

Documentation/devicetree/bindings/iio/light/isl29501.txt

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* ISL29501 Time-of-flight sensor.



Required properties:



  - compatible : should be "renesas,isl29501"

  - reg : the I2C address of the sensor



Example:



isl29501@57 {

	compatible = "renesas,isl29501";

	reg = <0x57>;

};

drivers/iio/proximity/Kconfig

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@@ -20,6 +20,19 @@ endmenu 


menu "Proximity and distance sensors"



config ISL29501

	tristate "Intersil ISL29501 Time Of Flight sensor"

	depends on I2C

	select IIO_BUFFER

	select IIO_TRIGGERED_BUFFER

	select IIO_KFIFO_BUF

	help

	  Say Y here if you want to build a driver for the Intersil ISL29501

	  Time of Flight sensor.



	  To compile this driver as a module, choose M here: the module will be

	  called isl29501.



config LIDAR_LITE_V2

	tristate "PulsedLight LIDAR sensor"

	select IIO_BUFFER

drivers/iio/proximity/Makefile

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# When adding new entries keep the list in alphabetical order

obj-$(CONFIG_AS3935)		+= as3935.o

obj-$(CONFIG_ISL29501)		+= isl29501.o

obj-$(CONFIG_LIDAR_LITE_V2)	+= pulsedlight-lidar-lite-v2.o

obj-$(CONFIG_RFD77402)		+= rfd77402.o

obj-$(CONFIG_SRF04)		+= srf04.o

drivers/iio/proximity/isl29501.c

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File added.

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