sysfs interface for analog devices adp5520(01) backlight driver
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The backlight brightness control operates at three different levels for the
adp5520 and adp5501 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>/daylight_max
What:		/sys/class/backlight/<backlight>/office_max
What:		/sys/class/backlight/<backlight>/dark_max
Date:		Sep, 2009
KernelVersion:	v2.6.32
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>/daylight_dim
What:		/sys/class/backlight/<backlight>/office_dim
What:		/sys/class/backlight/<backlight>/dark_dim
Date:		Sep, 2009
KernelVersion:	v2.6.32
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.