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iio: light: ROHM BU27034 Ambient Light Sensor

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ROHM BU27034 is an ambient light sensor with 3 channels and 3 photo diodes
capable of detecting a very wide range of illuminance. Typical application
is adjusting LCD and backlight power of TVs and mobile phones.

Add initial  support for the ROHM BU27034 ambient light sensor.

NOTE:
	- Driver exposes 4 channels. One IIO_LIGHT channel providing the
	  calculated lux values based on measured data from diodes #0 and
	  #1. In addition, 3 IIO_INTENSITY channels are emitting the raw
	  register data from all diodes for more intense user-space
	  computations.
	- Sensor has GAIN values that can be adjusted from 1x to 4096x.
	- Sensor has adjustible measurement times of 5, 55, 100, 200 and
	  400 mS. Driver does not support 5 mS which has special
	  limitations.
	- Driver exposes standard 'scale' adjustment which is
	  implemented by:
		1) Trying to adjust only the GAIN
		2) If GAIN adjustment alone can't provide requested
		   scale, adjusting both the time and the gain is
		   attempted.
	- Driver exposes writable INT_TIME property that can be used
	  for adjusting the measurement time. Time adjustment will also
	  cause the driver to try to adjust the GAIN so that the
	  overall scale is kept as close to the original as possible.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Link: https://lore.kernel.org/r/2a7efb6f335da5526fbe34b95137c5e45db5c5d3.1680263956.git.mazziesaccount@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Matti Vaittinen 2023-03-31 15:41:58 +03:00 committed by Jonathan Cameron
parent 0dca5c9730
commit e52afbd610
3 changed files with 1512 additions and 0 deletions
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14
drivers/iio/light/Kconfig
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@ -289,6 +289,20 @@ config JSA1212
To compile this driver as a module, choose M here:
the module will be called jsa1212.
config ROHM_BU27034
tristate "ROHM BU27034 ambient light sensor"
depends on I2C
select REGMAP_I2C
select IIO_GTS_HELPER
select IIO_BUFFER
select IIO_KFIFO_BUF
help
Enable support for the ROHM BU27034 ambient light sensor. ROHM BU27034
is an ambient light sesnor with 3 channels and 3 photo diodes capable
of detecting a very wide range of illuminance.
Typical application is adjusting LCD and backlight power of TVs and
mobile phones.
config RPR0521
tristate "ROHM RPR0521 ALS and proximity sensor driver"
depends on I2C

1
drivers/iio/light/Makefile
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@ -38,6 +38,7 @@ obj-$(CONFIG_MAX44009) += max44009.o
obj-$(CONFIG_NOA1305) += noa1305.o
obj-$(CONFIG_OPT3001) += opt3001.o
obj-$(CONFIG_PA12203001) += pa12203001.o
obj-$(CONFIG_ROHM_BU27034) += rohm-bu27034.o
obj-$(CONFIG_RPR0521) += rpr0521.o
obj-$(CONFIG_SI1133) += si1133.o
obj-$(CONFIG_SI1145) += si1145.o

1497
drivers/iio/light/rohm-bu27034.c Normal file
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