iio: add LM3533 ambient-light-sensor driver (9c8ea1b2) · Commits · 戴 / test

Documentation/ABI/testing/sysfs-bus-iio-light-lm3533-als

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		What: /sys/.../events/in_illuminance0_thresh_either_en
		Date: April 2012
		KernelVersion: 3.5
		Contact: Johan Hovold <jhovold@gmail.com>
		Description:
		Event generated when channel passes one of the four thresholds
		in each direction (rising\|falling) and a zone change occurs.
		The corresponding light zone can be read from
		in_illuminance0_zone.

		What: /sys/.../events/in_illuminance0_threshY_hysteresis
		Date: May 2012
		KernelVersion: 3.5
		Contact: Johan Hovold <jhovold@gmail.com>
		Description:
		Get the hysteresis for thresholds Y, that is,

		threshY_hysteresis = threshY_raising - threshY_falling

		What: /sys/.../events/illuminance_threshY_falling_value
		What: /sys/.../events/illuminance_threshY_raising_value
		Date: April 2012
		KernelVersion: 3.5
		Contact: Johan Hovold <jhovold@gmail.com>
		Description:
		Specifies the value of threshold that the device is comparing
		against for the events enabled by
		in_illuminance0_thresh_either_en (0..255), where Y in 0..3.

		Note that threshY_falling must be less than or equal to
		threshY_raising.

		These thresholds correspond to the eight zone-boundary
		registers (boundaryY_{low,high}) and defines the five light
		zones.

		What: /sys/bus/iio/devices/iio:deviceX/in_illuminance0_zone
		Date: April 2012
		KernelVersion: 3.5
		Contact: Johan Hovold <jhovold@gmail.com>
		Description:
		Get the current light zone (0..4) as defined by the
		in_illuminance0_threshY_{falling,rising} thresholds.

		What: /sys/bus/iio/devices/iio:deviceX/out_currentY_raw
		Date: May 2012
		KernelVersion: 3.5
		Contact: Johan Hovold <jhovold@gmail.com>
		Description:
		Get output current for channel Y (0..255), that is,
		out_currentY_currentZ_raw, where Z is the current zone.

		What: /sys/bus/iio/devices/iio:deviceX/out_currentY_currentZ_raw
		Date: May 2012
		KernelVersion: 3.5
		Contact: Johan Hovold <jhovold@gmail.com>
		Description:
		Set the output current for channel out_currentY when in zone
		Z (0..255), where Y in 0..2 and Z in 0..4.

		These values correspond to the ALS-mapper target registers for
		ALS-mapper Y + 1.

drivers/iio/Kconfig

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		@@ -50,5 +50,6 @@ config IIO_CONSUMERS_PER_TRIGGER

		source "drivers/iio/adc/Kconfig"
		source "drivers/iio/amplifiers/Kconfig"
		source "drivers/iio/light/Kconfig"

		endif # IIO

drivers/iio/Makefile

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		@@ -11,3 +11,4 @@ obj-$(CONFIG_IIO_KFIFO_BUF) += kfifo_buf.o

		obj-y += adc/
		obj-y += amplifiers/
		obj-y += light/

drivers/iio/light/Kconfig

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		#
		# Light sensors
		#
		menu "Light sensors"

		config SENSORS_LM3533
		tristate "LM3533 ambient light sensor"
		depends on MFD_LM3533
		help
		If you say yes here you get support for the ambient light sensor
		interface on National Semiconductor / TI LM3533 Lighting Power
		chips.

		The sensor interface can be used to control the LEDs and backlights
		of the chip through defining five light zones and three sets of
		corresponding output-current values.

		The driver provides raw and mean adc readings along with the current
		light zone through sysfs. A threshold event can be generated on zone
		changes. The ALS-control output values can be set per zone for the
		three current output channels.
		endmenu

drivers/iio/light/Makefile

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		#
		# Makefile for IIO Light sensors
		#

		obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o

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