| What: /sys/class/leds/<led>/pattern |
| Date: September 2018 |
| KernelVersion: 4.20 |
| Description: |
| Specify a software pattern for the LED, that supports altering |
| the brightness for the specified duration with one software |
| timer. It can do gradual dimming and step change of brightness. |
| |
| The pattern is given by a series of tuples, of brightness and |
| duration (ms). |
| |
| The exact format is described in: |
| Documentation/devicetree/bindings/leds/leds-trigger-pattern.txt |
| |
| What: /sys/class/leds/<led>/hr_pattern |
| Date: April 2024 |
| Description: |
| Specify a software pattern for the LED, that supports altering |
| the brightness for the specified duration with one software |
| timer. It can do gradual dimming and step change of brightness. |
| |
| Unlike the /sys/class/leds/<led>/pattern, this attribute runs |
| a pattern on high-resolution timer (hrtimer). |
| |
| What: /sys/class/leds/<led>/hw_pattern |
| Date: September 2018 |
| KernelVersion: 4.20 |
| Description: |
| Specify a hardware pattern for the LED, for LED hardware that |
| supports autonomously controlling brightness over time, according |
| to some preprogrammed hardware patterns. It deactivates any active |
| software pattern. |
| |
| Since different LED hardware can have different semantics of |
| hardware patterns, each driver is expected to provide its own |
| description for the hardware patterns in their documentation |
| file at Documentation/leds/. |
| |
| What: /sys/class/leds/<led>/repeat |
| Date: September 2018 |
| KernelVersion: 4.20 |
| Description: |
| Specify a pattern repeat number. -1 means repeat indefinitely, |
| other negative numbers and number 0 are invalid. |
| |
| This file will always return the originally written repeat |
| number. |
| |
| It should be noticed that some leds, like EL15203000 may |
| only support indefinitely patterns, so they always store -1. |
