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| 2 |
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| 3 | ========================
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| 4 | Kernel driver for lp5812
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| 5 | ========================
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| 6 |
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| 7 | * TI/National Semiconductor LP5812 LED Driver
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| 8 | * Datasheet: https://www.ti.com/product/LP5812#tech-docs
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| 9 |
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| 10 | Authors: Jared Zhou <[email protected]>
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| 11 |
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| 12 | Description
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| 13 | ===========
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| 14 |
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| 15 | The LP5812 is a 4x3 matrix LED driver with support for both manual and
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| 16 | autonomous animation control. This driver provides sysfs interfaces to
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| 17 | control and configure the LP5812 device and its LED channels.
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| 18 |
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| 19 | Sysfs Interface
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| 20 | ===============
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| 21 |
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| 22 | This driver uses the standard multicolor LED class interfaces defined
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| 23 | in Documentation/ABI/testing/sysfs-class-led-multicolor.
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| 24 |
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| 25 | Each LP5812 LED output appears under ``/sys/class/leds/`` with its
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| 26 | assigned label (for example ``LED_A``).
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| 27 |
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| 28 | The following attributes are exposed:
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| 29 | - multi_intensity: Per-channel RGB intensity control
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| 30 | - brightness: Standard brightness control (0-255)
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| 31 |
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| 32 | Autonomous Control Modes
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| 33 | ========================
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| 34 |
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| 35 | The driver also supports autonomous control through pattern configuration
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| 36 | (e.g., direct, tcmscan, or mixscan modes) defined in the device tree.
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| 37 | When configured, the LP5812 can generate transitions and color effects
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| 38 | without CPU intervention.
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| 39 |
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| 40 | Refer to the device tree binding document for valid mode strings and
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| 41 | configuration examples.
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| 42 |
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| 43 | Example Usage
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| 44 | =============
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| 45 |
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| 46 | To control LED_A::
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| 47 | # Set RGB intensity (R=50, G=50, B=50)
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| 48 | echo 50 50 50 > /sys/class/leds/LED_A/multi_intensity
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| 49 | # Set overall brightness to maximum
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| 50 | echo 255 > /sys/class/leds/LED_A/brightness
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