From 8dbac65f5c181e4723586ab738b703bb23bc3f2a Mon Sep 17 00:00:00 2001 From: Baolin Wang Date: Thu, 11 Oct 2018 12:07:15 +0800 Subject: leds: sc27xx: Add pattern_set/clear interfaces for LED controller This patch implements the 'pattern_set'and 'pattern_clear' interfaces to support SC27XX LED breathing mode. Signed-off-by: Baolin Wang Acked-by: Pavel Machek Signed-off-by: Jacek Anaszewski --- .../ABI/testing/sysfs-class-led-driver-sc27xx | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-class-led-driver-sc27xx (limited to 'Documentation/ABI') diff --git a/Documentation/ABI/testing/sysfs-class-led-driver-sc27xx b/Documentation/ABI/testing/sysfs-class-led-driver-sc27xx new file mode 100644 index 000000000000..45b1e605d355 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-led-driver-sc27xx @@ -0,0 +1,22 @@ +What: /sys/class/leds//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". -- cgit v1.2.3-59-g8ed1b