Kernel driver for lp5812

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.rstABI file 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