xref: /openbmc/linux/Documentation/leds/leds-el15203000.rst (revision cdd38c5f1ce4398ec58fec95904b75824daab7b5)

.. SPDX-License-Identifier: GPL-2.0

==================================
Kernel driver for Crane EL15203000
==================================

/sys/class/leds/<led>/hw_pattern
--------------------------------

Specify a hardware pattern for the EL15203000 LED.

The LEDs board supports only predefined patterns by firmware
for specific LEDs.

Breathing mode for Screen frame light tube::

    "0 4000 1 4000"

	^
	|
    Max-|     ---
	|    /   \
	|   /     \
	|  /       \     /
	| /         \   /
    Min-|-           ---
	|
	0------4------8--> time (sec)

Cascade mode for Pipe LED::

    "1 800 2 800 4 800 8 800 16 800"

	^
	|
  0 On -|----+                   +----+                   +---
	|    |                   |    |                   |
    Off-|    +-------------------+    +-------------------+
	|
  1 On -|    +----+                   +----+
	|    |    |                   |    |
    Off |----+    +-------------------+    +------------------
	|
  2 On -|         +----+                   +----+
	|         |    |                   |    |
    Off-|---------+    +-------------------+    +-------------
	|
  3 On -|              +----+                   +----+
	|              |    |                   |    |
    Off-|--------------+    +-------------------+    +--------
	|
  4 On -|                   +----+                   +----+
	|                   |    |                   |    |
    Off-|-------------------+    +-------------------+    +---
	|
	0---0.8--1.6--2.4--3.2---4---4.8--5.6--6.4--7.2---8--> time (sec)

Inverted cascade mode for Pipe LED::

    "30 800 29 800 27 800 23 800 15 800"

	^
	|
  0 On -|    +-------------------+    +-------------------+
	|    |                   |    |                   |
    Off-|----+                   +----+                   +---
	|
  1 On -|----+    +-------------------+    +------------------
	|    |    |                   |    |
    Off |    +----+                   +----+
	|
  2 On -|---------+    +-------------------+    +-------------
	|         |    |                   |    |
    Off-|         +----+                   +----+
	|
  3 On -|--------------+    +-------------------+    +--------
	|              |    |                   |    |
    Off-|              +----+                   +----+
	|
  4 On -|-------------------+    +-------------------+    +---
	|                   |    |                   |    |
    Off-|                   +----+                   +----+
	|
	0---0.8--1.6--2.4--3.2---4---4.8--5.6--6.4--7.2---8--> time (sec)

Bounce mode for Pipe LED::

    "1 800 2 800 4 800 8 800 16 800 16 800 8 800 4 800 2 800 1 800"

	^
	|
  0 On -|----+                                       +--------
	|    |                                       |
    Off-|    +---------------------------------------+
	|
  1 On -|    +----+                             +----+
	|    |    |                             |    |
    Off |----+    +-----------------------------+    +--------
	|
  2 On -|         +----+                   +----+
	|         |    |                   |    |
    Off-|---------+    +-------------------+    +-------------
	|
  3 On -|              +----+         +----+
	|              |    |         |    |
    Off-|--------------+    +---------+    +------------------
	|
  4 On -|                   +---------+
	|                   |         |
    Off-|-------------------+         +-----------------------
	|
	0---0.8--1.6--2.4--3.2---4---4.8--5.6--6.4--7.2---8--> time (sec)

Inverted bounce mode for Pipe LED::

    "30 800 29 800 27 800 23 800 15 800 15 800 23 800 27 800 29 800 30 800"

	^
	|
  0 On -|    +---------------------------------------+
	|    |                                       |
    Off-|----+                                       +--------
	|
  1 On -|----+    +-----------------------------+    +--------
	|    |    |                             |    |
    Off |    +----+                             +----+
	|
  2 On -|---------+    +-------------------+    +-------------
	|         |    |                   |    |
    Off-|         +----+                   +----+
	|
  3 On -|--------------+    +---------+    +------------------
	|              |    |         |    |
    Off-|              +----+         +----+
	|
  4 On -|-------------------+         +-----------------------
	|                   |         |
    Off-|                   +---------+
	|
	0---0.8--1.6--2.4--3.2---4---4.8--5.6--6.4--7.2---8--> time (sec)