| What: /sys/class/leds/<led>/hw_pattern |
| Date: September 2018 |
| KernelVersion: 4.20 |
| Description: |
| Specify a hardware pattern for the SC27XX LED. For the SC27XX |
| LED controller, it only supports 4 stages to make a single |
| hardware pattern, which is used to configure the rise time, |
| high time, fall time and low time for the breathing mode. |
| |
| For the breathing mode, the SC27XX LED only expects one brightness |
| for the high stage. To be compatible with the hardware pattern |
| format, we should set brightness as 0 for rise stage, fall |
| stage and low stage. |
| |
| Min stage duration: 125 ms |
| Max stage duration: 31875 ms |
| |
| Since the stage duration step is 125 ms, the duration should be |
| a multiplier of 125, like 125ms, 250ms, 375ms, 500ms ... 31875ms. |
| |
| Thus the format of the hardware pattern values should be: |
| "0 rise_duration brightness high_duration 0 fall_duration 0 low_duration". |
