| 1 | What: /sys/class/leds/<led>/pattern |
| 2 | Date: September 2018 |
| 3 | KernelVersion: 4.20 |
| 4 | Description: |
| 5 | Specify a software pattern for the LED, that supports altering |
| 6 | the brightness for the specified duration with one software |
| 7 | timer. It can do gradual dimming and step change of brightness. |
| 8 | |
| 9 | The pattern is given by a series of tuples, of brightness and |
| 10 | duration (ms). |
| 11 | |
| 12 | The exact format is described in: |
| 13 | Documentation/devicetree/bindings/leds/leds-trigger-pattern.txt |
| 14 | |
| 15 | What: /sys/class/leds/<led>/hr_pattern |
| 16 | Date: April 2024 |
| 17 | Description: |
| 18 | Specify a software pattern for the LED, that supports altering |
| 19 | the brightness for the specified duration with one software |
| 20 | timer. It can do gradual dimming and step change of brightness. |
| 21 | |
| 22 | Unlike the /sys/class/leds/<led>/pattern, this attribute runs |
| 23 | a pattern on high-resolution timer (hrtimer). |
| 24 | |
| 25 | What: /sys/class/leds/<led>/hw_pattern |
| 26 | Date: September 2018 |
| 27 | KernelVersion: 4.20 |
| 28 | Description: |
| 29 | Specify a hardware pattern for the LED, for LED hardware that |
| 30 | supports autonomously controlling brightness over time, according |
| 31 | to some preprogrammed hardware patterns. It deactivates any active |
| 32 | software pattern. |
| 33 | |
| 34 | Since different LED hardware can have different semantics of |
| 35 | hardware patterns, each driver is expected to provide its own |
| 36 | description for the hardware patterns in their documentation |
| 37 | file at Documentation/leds/. |
| 38 | |
| 39 | What: /sys/class/leds/<led>/repeat |
| 40 | Date: September 2018 |
| 41 | KernelVersion: 4.20 |
| 42 | Description: |
| 43 | Specify a pattern repeat number. -1 means repeat indefinitely, |
| 44 | other negative numbers and number 0 are invalid. |
| 45 | |
| 46 | This file will always return the originally written repeat |
| 47 | number. |
| 48 | |
| 49 | It should be noticed that some leds, like EL15203000 may |
| 50 | only support indefinitely patterns, so they always store -1. |