| .. 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. |
