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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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Aishwarya Pant 2018-02-06 13:11:12 +05:30 committed by Jonathan Corbet
parent 9671a7f131
commit e55ee9349f
1 changed files with 54 additions and 0 deletions
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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.