39 lines
1.1 KiB
ReStructuredText
39 lines
1.1 KiB
ReStructuredText
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.. SPDX-License-Identifier: GPL-2.0
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===========================================================
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Kernel driver for Intel Cherry Trail Whiskey Cove PMIC LEDs
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===========================================================
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/sys/class/leds/<led>/hw_pattern
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--------------------------------
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Specify a hardware pattern for the Whiskey Cove PMIC LEDs.
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The only supported pattern is hardware breathing mode::
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"0 2000 1 2000"
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^
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Max-| ---
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| / \
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| / \
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| / \ /
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| / \ /
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Min-|- ---
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0------2------4--> time (sec)
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The rise and fall times must be the same value.
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Supported values are 2000, 1000, 500 and 250 for
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breathing frequencies of 1/4, 1/2, 1 and 2 Hz.
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The set pattern only controls the timing. For max brightness the last
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set brightness is used and the max brightness can be changed
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while breathing by writing the brightness attribute.
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This is just like how blinking works in the LED subsystem,
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for both sw and hw blinking the brightness can also be changed
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while blinking. Breathing on this hw really is just a variant
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mode of blinking.
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