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If the MCU on Turris Omnia is running newer firmware versions, the LED controller supports RGB gamma correction (and enables it by default for newer boards). Determine whether the gamma correction setting feature is supported and add the ability to set it via sysfs attribute file. Signed-off-by: Marek Behún <kabel@kernel.org> Link: https://lore.kernel.org/r/20230918161104.20860-5-kabel@kernel.org Signed-off-by: Lee Jones <lee@kernel.org>
29 lines
1.1 KiB
Plaintext
29 lines
1.1 KiB
Plaintext
What: /sys/class/leds/<led>/device/brightness
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Date: July 2020
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KernelVersion: 5.9
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Contact: Marek Behún <kabel@kernel.org>
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Description: (RW) On the front panel of the Turris Omnia router there is also
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a button which can be used to control the intensity of all the
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LEDs at once, so that if they are too bright, user can dim them.
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The microcontroller cycles between 8 levels of this global
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brightness (from 100% to 0%), but this setting can have any
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integer value between 0 and 100. It is therefore convenient to be
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able to change this setting from software.
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Format: %i
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What: /sys/class/leds/<led>/device/gamma_correction
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Date: August 2023
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KernelVersion: 6.6
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Contact: Marek Behún <kabel@kernel.org>
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Description: (RW) Newer versions of the microcontroller firmware of the
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Turris Omnia router support gamma correction for the RGB LEDs.
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This feature can be enabled/disabled by writing to this file.
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If the feature is not supported because the MCU firmware is too
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old, the file always reads as 0, and writing to the file results
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in the EOPNOTSUPP error.
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Format: %i
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