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+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".