mirror of
https://github.com/torvalds/linux.git
synced 2026-03-08 01:24:47 +01:00
444bb79e89
The driver provides sysfs interfaces to control and configure the LP5812 device and its LED channels. The documentation describes the chip's capabilities, sysfs interface, and usage examples. Signed-off-by: Nam Tran <trannamatk@gmail.com> Link: https://patch.msgid.link/20260115161013.40706-3-trannamatk@gmail.com Signed-off-by: Lee Jones <lee@kernel.org>
50 lines
1.5 KiB
ReStructuredText
50 lines
1.5 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
|
|
|
|
========================
|
|
Kernel driver for lp5812
|
|
========================
|
|
|
|
* TI/National Semiconductor LP5812 LED Driver
|
|
* Datasheet: https://www.ti.com/product/LP5812#tech-docs
|
|
|
|
Authors: Jared Zhou <jared-zhou@ti.com>
|
|
|
|
Description
|
|
===========
|
|
|
|
The LP5812 is a 4x3 matrix LED driver with support for both manual and
|
|
autonomous animation control. This driver provides sysfs interfaces to
|
|
control and configure the LP5812 device and its LED channels.
|
|
|
|
Sysfs Interface
|
|
===============
|
|
|
|
This driver uses the standard multicolor LED class interfaces defined
|
|
in Documentation/ABI/testing/sysfs-class-led-multicolor.rst.
|
|
|
|
Each LP5812 LED output appears under ``/sys/class/leds/`` with its
|
|
assigned label (for example ``LED_A``).
|
|
|
|
The following attributes are exposed:
|
|
- multi_intensity: Per-channel RGB intensity control
|
|
- brightness: Standard brightness control (0-255)
|
|
|
|
Autonomous Control Modes
|
|
========================
|
|
|
|
The driver also supports autonomous control through pattern configuration
|
|
(e.g., direct, tcmscan, or mixscan modes) defined in the device tree.
|
|
When configured, the LP5812 can generate transitions and color effects
|
|
without CPU intervention.
|
|
|
|
Refer to the device tree binding document for valid mode strings and
|
|
configuration examples.
|
|
|
|
Example Usage
|
|
=============
|
|
|
|
To control LED_A::
|
|
# Set RGB intensity (R=50, G=50, B=50)
|
|
echo 50 50 50 > /sys/class/leds/LED_A/multi_intensity
|
|
# Set overall brightness to maximum
|
|
echo 255 > /sys/class/leds/LED_A/brightness
|