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