1*4882a593Smuzhiyun.. SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun 3*4882a593Smuzhiyun=================================== 4*4882a593SmuzhiyunKernel driver for Spreadtrum SC27XX 5*4882a593Smuzhiyun=================================== 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun/sys/class/leds/<led>/hw_pattern 8*4882a593Smuzhiyun-------------------------------- 9*4882a593Smuzhiyun 10*4882a593SmuzhiyunSpecify a hardware pattern for the SC27XX LED. For the SC27XX 11*4882a593SmuzhiyunLED controller, it only supports 4 stages to make a single 12*4882a593Smuzhiyunhardware pattern, which is used to configure the rise time, 13*4882a593Smuzhiyunhigh time, fall time and low time for the breathing mode. 14*4882a593Smuzhiyun 15*4882a593SmuzhiyunFor the breathing mode, the SC27XX LED only expects one brightness 16*4882a593Smuzhiyunfor the high stage. To be compatible with the hardware pattern 17*4882a593Smuzhiyunformat, we should set brightness as 0 for rise stage, fall 18*4882a593Smuzhiyunstage and low stage. 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun- Min stage duration: 125 ms 21*4882a593Smuzhiyun- Max stage duration: 31875 ms 22*4882a593Smuzhiyun 23*4882a593SmuzhiyunSince the stage duration step is 125 ms, the duration should be 24*4882a593Smuzhiyuna multiplier of 125, like 125ms, 250ms, 375ms, 500ms ... 31875ms. 25*4882a593Smuzhiyun 26*4882a593SmuzhiyunThus the format of the hardware pattern values should be: 27*4882a593Smuzhiyun"0 rise_duration brightness high_duration 0 fall_duration 0 low_duration". 28