projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 26a07553 MCC |
1 | .. SPDX-License-Identifier: GPL-2.0 |
| 2 | ||
| 3 | =================================== | |
| 4 | Kernel driver for Spreadtrum SC27XX | |
| 5 | =================================== | |
| 6 | ||
| 7 | /sys/class/leds/<led>/hw_pattern | |
| 8 | -------------------------------- | |
| 9 | ||
| 10 | Specify a hardware pattern for the SC27XX LED. For the SC27XX | |
| 11 | LED controller, it only supports 4 stages to make a single | |
| 12 | hardware pattern, which is used to configure the rise time, | |
| 13 | high time, fall time and low time for the breathing mode. | |
| 14 | ||
| 15 | For the breathing mode, the SC27XX LED only expects one brightness | |
| 16 | for the high stage. To be compatible with the hardware pattern | |
| 17 | format, we should set brightness as 0 for rise stage, fall | |
| 18 | stage and low stage. | |
| 19 | ||
| 20 | - Min stage duration: 125 ms | |
| 21 | - Max stage duration: 31875 ms | |
| 22 | ||
| 23 | Since the stage duration step is 125 ms, the duration should be | |
| 24 | a multiplier of 125, like 125ms, 250ms, 375ms, 500ms ... 31875ms. | |
| 25 | ||
| 26 | Thus the format of the hardware pattern values should be: | |
| 27 | "0 rise_duration brightness high_duration 0 fall_duration 0 low_duration". |