diff options
| author | Baolin Wang <baolin.wang@linaro.org> | 2018-10-11 12:07:15 +0800 |
|---|---|---|
| committer | Jacek Anaszewski <jacek.anaszewski@gmail.com> | 2018-10-11 21:59:11 +0200 |
| commit | 8dbac65f5c181e4723586ab738b703bb23bc3f2a (patch) | |
| tree | e1a51c0ed5f1d1b395274c6a732e23952cd7cef7 /Documentation/ABI/testing/sysfs-class-led-driver-sc27xx | |
| parent | 5fd752b6b3a2233972ce1726df8bdb40886113a9 (diff) | |
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 <baolin.wang@linaro.org>
Acked-by: Pavel Machek <pavel@ucw.c>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-class-led-driver-sc27xx')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-led-driver-sc27xx | 22 |
1 files changed, 22 insertions, 0 deletions
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/<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". |