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iio: acpi: Add support for ACPI0008 Ambient Light Sensor

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This driver adds the initial support for the ACPI Ambient Light Sensor
as defined in Section 9.2 of the ACPI specification (Revision 5.0) [1].

Sensors complying with the standard are exposed as ACPI devices with
ACPI0008 as hardware ID and provide standard methods by which the OS
can query properties of the ambient light environment the system is
currently operating in.

This driver currently allows only to get the current ambient light
illuminance reading through the _ALI method, but is ready to be
extended extended to handle _ALC, _ALT and _ALP as well.

[1] http://www.acpi.info/DOWNLOADS/ACPIspec50.pdf

Signed-off-by: Martin Liska <marxin.liska@gmail.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Cc: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Gabriele Mazzotta
2015-05-02 14:30:57 +02:00
committed by Jonathan Cameron
parent ee1a81f90f
commit feca56ff40
3 changed files with 245 additions and 0 deletions
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13
drivers/iio/light/Kconfig
View File

@@ -5,6 +5,19 @@
menu "Light sensors"
config ACPI_ALS
tristate "ACPI Ambient Light Sensor"
depends on ACPI
select IIO_BUFFER
select IIO_TRIGGERED_BUFFER
select IIO_KFIFO_BUF
help
Say Y here if you want to build a driver for the ACPI0008
Ambient Light Sensor.
To compile this driver as a module, choose M here: the module will
be called acpi-als.
config ADJD_S311
tristate "ADJD-S311-CR999 digital color sensor"
select IIO_BUFFER