Based on kernel version 7.2. Page generated on 2026-08-20 08:41 EST.
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.. SPDX-License-Identifier: GPL-2.0
======================================
Samsung S2M Series PMIC RGB LED Driver
======================================
Description
-----------
The RGB LED on the S2M series PMIC hardware features a three-channel LED that
is grouped together as a single device. Furthermore, it supports 8-bit
brightness control for each channel. This LED is typically used as a status
indicator in mobile devices. It also supports various parameters for hardware
patterns.
The hardware pattern can be programmed using the "pattern" trigger, using the
hw_pattern attribute.
/sys/class/leds/<led>/repeat
----------------------------
The hardware supports only indefinitely repeating patterns. The repeat
attribute must be set to -1 for hardware patterns to function.
/sys/class/leds/<led>/hw_pattern
--------------------------------
Specify a hardware pattern for the RGB LEDs.
The pattern is a series of brightness levels and durations in milliseconds.
There should be only one non-zero brightness level. Unlike the results
described in leds-trigger-pattern, the transitions between on and off states
are smoothed out by the hardware.
Simple pattern::
"255 3000 0 1000"
255 -+ ''''''-. .-'''''''-.
| '. .' '.
| \ / \
| '. .' '.
| '-.......-' '-
0 -+-------+-------+-------+-------+-------+-------+--> time (s)
0 1 2 3 4 5 6
As described in leds-trigger-pattern, it is also possible to use zero-length
entries to disable the ramping mechanism.
On-Off pattern::
"255 1000 255 0 0 1000 0 0"
255 -+ ------+ +-------+ +-------+
| | | | | |
| | | | | |
| | | | | |
| +-------+ +-------+ +-------
0 -+-------+-------+-------+-------+-------+-------+--> time (s)
0 1 2 3 4 5 6
|