leds-sc27xx.rst 989 B

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