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