187 lines
6.3 KiB
Plaintext
187 lines
6.3 KiB
Plaintext
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What: /sys/class/backlight/<backlight>/scale
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Date: July 2019
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KernelVersion: 5.4
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Contact: Daniel Thompson <daniel.thompson@linaro.org>
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Description:
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Description of the scale of the brightness curve.
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The human eye senses brightness approximately logarithmically,
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hence linear changes in brightness are perceived as being
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non-linear. To achieve a linear perception of brightness changes
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controls like sliders need to apply a logarithmic mapping for
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backlights with a linear brightness curve.
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Possible values of the attribute are:
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unknown
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The scale of the brightness curve is unknown.
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linear
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The brightness changes linearly with each step. Brightness
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controls should apply a logarithmic mapping for a linear
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perception.
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non-linear
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The brightness changes non-linearly with each step. Brightness
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controls should use a linear mapping for a linear perception.
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What: /sys/class/backlight/<backlight>/ambient_light_level
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Date: Apr, 2010
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KernelVersion: v2.6.35
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Contact: Michael Hennerich <michael.hennerich@analog.com>
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Description:
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(RO) Get conversion value of the light sensor.
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The value is automatically updated every 80 ms when the
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light sensor is enabled.
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The value range is device-driver specific:
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For ADP8870:
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It returns integer between 0 (dark) and 8000 (max ambient
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brightness).
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For ADP8860:
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It returns a 13-bits integer.
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What: /sys/class/backlight/<backlight>/ambient_light_zone
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Date: Apr, 2010
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KernelVersion: v2.6.35
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Contact: Michael Hennerich <michael.hennerich@analog.com>,
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device-drivers-devel@blackfin.uclinux.org
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Description:
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(RW) Read or write the specific brightness level at which the
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backlight operates.
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The value meaning is device-driver specific:
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For ADP8860:
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== ==========================
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0 Off: Backlight set to 0 mA
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1 Level 1: daylight
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2 Level 2: bright
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3 Level 3: dark
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== ==========================
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For ADP8870:
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== ==========================
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0 Off: Backlight set to 0 mA
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1 Level 1: daylight
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2 Level 2: bright
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3 Level 3: office
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4 Level 4: indoor
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5 Level 5: dark
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== ==========================
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Writing 0 returns to normal/automatic ambient light level
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operation.
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It can be enabled by writing the value stored in
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/sys/class/backlight/<backlight>/max_brightness to
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/sys/class/backlight/<backlight>/brightness.
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What: /sys/class/backlight/<backlight>/<ambient light zone>_max
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Date: Sep, 2009
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KernelVersion: v2.6.32
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Contact: device-drivers-devel@blackfin.uclinux.org
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Description:
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Control the maximum brightness for <ambient light zone>
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on this <backlight>. Values are between 0 and 127. This file
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will also show the brightness level stored for this
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<ambient light zone>.
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The <ambient light zone> is device-driver specific:
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For ADP5520 and ADP5501, <ambient light zone> can be:
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=========== ================================================
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Ambient sysfs entry
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light zone
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=========== ================================================
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daylight /sys/class/backlight/<backlight>/daylight_max
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office /sys/class/backlight/<backlight>/office_max
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dark /sys/class/backlight/<backlight>/dark_max
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=========== ================================================
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For ADP8860, <ambient light zone> can be:
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=========== ================================================
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Ambient sysfs entry
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light zone
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=========== ================================================
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l1_daylight /sys/class/backlight/<backlight>/l1_daylight_max
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l2_office /sys/class/backlight/<backlight>/l2_office_max
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l3_dark /sys/class/backlight/<backlight>/l3_dark_max
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=========== ================================================
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For ADP8870, <ambient light zone> can be:
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=========== ================================================
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Ambient sysfs entry
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light zone
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=========== ================================================
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l1_daylight /sys/class/backlight/<backlight>/l1_daylight_max
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l2_bright /sys/class/backlight/<backlight>/l2_bright_max
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l3_office /sys/class/backlight/<backlight>/l3_office_max
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l4_indoor /sys/class/backlight/<backlight>/l4_indoor_max
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l5_dark /sys/class/backlight/<backlight>/l5_dark_max
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=========== ================================================
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See also: /sys/class/backlight/<backlight>/ambient_light_zone.
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What: /sys/class/backlight/<backlight>/<ambient light zone>_dim
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Date: Sep, 2009
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KernelVersion: v2.6.32
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Contact: device-drivers-devel@blackfin.uclinux.org
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Description:
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Control the dim brightness for <ambient light zone>
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on this <backlight>. Values are between 0 and 127, typically
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set to 0. Full off when the backlight is disabled.
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This file will also show the dim brightness level stored for
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this <ambient light zone>.
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The <ambient light zone> is device-driver specific:
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For ADP5520 and ADP5501, <ambient light zone> can be:
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=========== ================================================
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Ambient sysfs entry
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light zone
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=========== ================================================
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daylight /sys/class/backlight/<backlight>/daylight_dim
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office /sys/class/backlight/<backlight>/office_dim
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dark /sys/class/backlight/<backlight>/dark_dim
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=========== ================================================
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For ADP8860, <ambient light zone> can be:
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=========== ================================================
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Ambient sysfs entry
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light zone
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=========== ================================================
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l1_daylight /sys/class/backlight/<backlight>/l1_daylight_dim
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l2_office /sys/class/backlight/<backlight>/l2_office_dim
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l3_dark /sys/class/backlight/<backlight>/l3_dark_dim
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=========== ================================================
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For ADP8870, <ambient light zone> can be:
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=========== ================================================
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Ambient sysfs entry
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light zone
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=========== ================================================
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l1_daylight /sys/class/backlight/<backlight>/l1_daylight_dim
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l2_bright /sys/class/backlight/<backlight>/l2_bright_dim
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l3_office /sys/class/backlight/<backlight>/l3_office_dim
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l4_indoor /sys/class/backlight/<backlight>/l4_indoor_dim
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l5_dark /sys/class/backlight/<backlight>/l5_dark_dim
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=========== ================================================
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See also: /sys/class/backlight/<backlight>/ambient_light_zone.
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