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authorAishwarya Pant <aishpant@gmail.com>2018-02-06 13:11:12 +0530
committerJonathan Corbet <corbet@lwn.net>2018-02-23 08:21:48 -0700
commite55ee9349f7b473c92bae6fe37eba878a15e2326 (patch)
tree0ab651c67f4b81f45acdeb844ec9c8b47b1b0e7e /Documentation/ABI
parent9671a7f1319a793c5dc728f29f5a62c564f806ea (diff)
backlight: adp8860: document sysfs attributes
Add documentation for sysfs interface of adp8860 series backlight devices by reading through code and git commits. Signed-off-by: Aishwarya Pant <aishpant@gmail.com> Acked-by: Michael Hennerich <michael.hennerich@analog.com> Acked-by: Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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+sysfs interface for analog devices adp8860 backlight driver
+-----------------------------------------------------------
+
+The backlight brightness control operates at three different levels for the
+adp8860, adp8861 and adp8863 devices: daylight (level 1), office (level 2) and
+dark (level 3). By default the brightness operates at the daylight brightness
+level.
+
+What: /sys/class/backlight/<backlight>/ambient_light_level
+Date: Apr, 2010
+KernelVersion: v2.6.35
+Contact: Michael Hennerich <michael.hennerich@analog.com>
+Description:
+ (RO) 13-bit conversion value for the first light sensor—high
+ byte (Bit 12 to Bit 8). The value is updated every 80 ms (when
+ the light sensor is enabled).
+
+
+What: /sys/class/backlight/<backlight>/ambient_light_zone
+Date: Apr, 2010
+KernelVersion: v2.6.35
+Contact: Michael Hennerich <michael.hennerich@analog.com>
+Description:
+ (RW) Read or write the specific level at which the backlight
+ operates. Value "0" enables automatic ambient light sensing, and
+ values "1", "2" or "3" set the control to daylight, office or
+ dark respectively.
+
+
+What: /sys/class/backlight/<backlight>/l1_daylight_max
+What: /sys/class/backlight/<backlight>/l2_office_max
+What: /sys/class/backlight/<backlight>/l3_dark_max
+Date: Apr, 2010
+KernelVersion: v2.6.35
+Contact: Michael Hennerich <michael.hennerich@analog.com>
+Description:
+ (RW) Maximum current setting for the backlight when brightness
+ is at one of the three levels (daylight, office or dark). This
+ is an input code between 0 and 127, which is transformed to a
+ value between 0 mA and 30 mA using linear or non-linear
+ algorithms.
+
+
+What: /sys/class/backlight/<backlight>/l1_daylight_dim
+What: /sys/class/backlight/<backlight>/l2_office_dim
+What: /sys/class/backlight/<backlight>/l3_dark_dim
+Date: Apr, 2010
+KernelVersion: v2.6.35
+Contact: Michael Hennerich <michael.hennerich@analog.com>
+Description:
+ (RW) Dim current setting for the backlight when brightness is at
+ one of the three levels (daylight, office or dark). This is an
+ input code between 0 and 127, which is transformed to a value
+ between 0 mA and 30 mA using linear or non-linear algorithms.