leds: add LED driver for EL15203000 board
This patch adds a LED class driver for the LEDs found on the Crane Merchandising System EL15203000 LEDs board (aka RED LEDs board). Signed-off-by: Oleh Kravchenko <oleg@kaa.org.ua> Reviewed-by: Dan Murphy <dmurphy@ti.com> Signed-off-by: Pavel Machek <pavel@ucw.cz>alistair/sunxi64-5.5-dsi
Oleh Kravchenko
Pavel
parent
a788f6f2e2
commit
fc19967bcb
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@ -0,0 +1,139 @@
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What: /sys/class/leds/<led>/hw_pattern
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Date: September 2019
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KernelVersion: 5.5
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Description:
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Specify a hardware pattern for the EL15203000 LED.
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The LEDs board supports only predefined patterns by firmware
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for specific LEDs.
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Breathing mode for Screen frame light tube:
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"0 4000 1 4000"
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^
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Max-| ---
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| / \
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| / \
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| / \ /
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| / \ /
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Min-|- ---
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0------4------8--> time (sec)
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Cascade mode for Pipe LED:
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"1 800 2 800 4 800 8 800 16 800"
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^
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0 On -|----+ +----+ +---
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Off-| +-------------------+ +-------------------+
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1 On -| +----+ +----+
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Off |----+ +-------------------+ +------------------
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2 On -| +----+ +----+
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Off-|---------+ +-------------------+ +-------------
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3 On -| +----+ +----+
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Off-|--------------+ +-------------------+ +--------
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4 On -| +----+ +----+
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Off-|-------------------+ +-------------------+ +---
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0---0.8--1.6--2.4--3.2---4---4.8--5.6--6.4--7.2---8--> time (sec)
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Inverted cascade mode for Pipe LED:
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"30 800 29 800 27 800 23 800 15 800"
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^
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0 On -| +-------------------+ +-------------------+
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Off-|----+ +----+ +---
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1 On -|----+ +-------------------+ +------------------
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Off | +----+ +----+
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2 On -|---------+ +-------------------+ +-------------
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Off-| +----+ +----+
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3 On -|--------------+ +-------------------+ +--------
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Off-| +----+ +----+
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4 On -|-------------------+ +-------------------+ +---
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Off-| +----+ +----+
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0---0.8--1.6--2.4--3.2---4---4.8--5.6--6.4--7.2---8--> time (sec)
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Bounce mode for Pipe LED:
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"1 800 2 800 4 800 8 800 16 800 16 800 8 800 4 800 2 800 1 800"
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^
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0 On -|----+ +--------
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Off-| +---------------------------------------+
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1 On -| +----+ +----+
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Off |----+ +-----------------------------+ +--------
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2 On -| +----+ +----+
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Off-|---------+ +-------------------+ +-------------
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3 On -| +----+ +----+
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Off-|--------------+ +---------+ +------------------
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4 On -| +---------+
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Off-|-------------------+ +-----------------------
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0---0.8--1.6--2.4--3.2---4---4.8--5.6--6.4--7.2---8--> time (sec)
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Inverted bounce mode for Pipe LED:
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"30 800 29 800 27 800 23 800 15 800 15 800 23 800 27 800 29 800 30 800"
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^
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0 On -| +---------------------------------------+
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Off-|----+ +--------
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1 On -|----+ +-----------------------------+ +--------
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Off | +----+ +----+
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2 On -|---------+ +-------------------+ +-------------
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Off-| +----+ +----+
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3 On -|--------------+ +---------+ +------------------
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Off-| +----+ +----+
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4 On -|-------------------+ +-----------------------
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Off-| +---------+
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0---0.8--1.6--2.4--3.2---4---4.8--5.6--6.4--7.2---8--> time (sec)
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What: /sys/class/leds/<led>/repeat
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Date: September 2019
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KernelVersion: 5.5
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Description:
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EL15203000 supports only indefinitely patterns,
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so this file should always store -1.
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For more info, please see:
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Documentation/ABI/testing/sysfs-class-led-trigger-pattern
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@ -132,6 +132,19 @@ config LEDS_CR0014114
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To compile this driver as a module, choose M here: the module
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will be called leds-cr0014114.
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config LEDS_EL15203000
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tristate "LED Support for Crane EL15203000"
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depends on LEDS_CLASS
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depends on SPI
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depends on OF
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help
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This option enables support for EL15203000 LED Board
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(aka RED LED board) which is widely used in coffee vending
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machines produced by Crane Merchandising Systems.
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To compile this driver as a module, choose M here: the module
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will be called leds-el15203000.
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config LEDS_LM3530
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tristate "LCD Backlight driver for LM3530"
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depends on LEDS_CLASS
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@ -89,6 +89,7 @@ obj-$(CONFIG_LEDS_LM36274) += leds-lm36274.o
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# LED SPI Drivers
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obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o
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obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
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obj-$(CONFIG_LEDS_EL15203000) += leds-el15203000.o
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# LED Userspace Drivers
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obj-$(CONFIG_LEDS_USER) += uleds.o
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@ -0,0 +1,357 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2019 Crane Merchandising Systems. All rights reserved.
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// Copyright (C) 2019 Oleh Kravchenko <oleg@kaa.org.ua>
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#include <linux/delay.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/spi/spi.h>
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/*
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* EL15203000 SPI protocol description:
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* +-----+---------+
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* | LED | COMMAND |
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* +-----+---------+
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* | 1 | 1 |
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* +-----+---------+
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* (*) LEDs MCU board expects 20 msec delay per byte.
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*
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* LEDs:
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* +----------+--------------+-------------------------------------------+
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* | ID | NAME | DESCRIPTION |
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* +----------+--------------+-------------------------------------------+
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* | 'P' 0x50 | Pipe | Consists from 5 LEDs, controlled by board |
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* +----------+--------------+-------------------------------------------+
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* | 'S' 0x53 | Screen frame | Light tube around the screen |
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* +----------+--------------+-------------------------------------------+
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* | 'V' 0x56 | Vending area | Highlights a cup of coffee |
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* +----------+--------------+-------------------------------------------+
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*
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* COMMAND:
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* +----------+-----------------+--------------+--------------+
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* | VALUES | PIPE | SCREEN FRAME | VENDING AREA |
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* +----------+-----------------+--------------+--------------+
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* | '0' 0x30 | Off |
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* +----------+-----------------------------------------------+
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* | '1' 0x31 | On |
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* +----------+-----------------+--------------+--------------+
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* | '2' 0x32 | Cascade | Breathing |
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* +----------+-----------------+--------------+
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* | '3' 0x33 | Inverse cascade |
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* +----------+-----------------+
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* | '4' 0x34 | Bounce |
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* +----------+-----------------+
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* | '5' 0x35 | Inverse bounce |
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* +----------+-----------------+
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*/
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/* EL15203000 default settings */
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#define EL_FW_DELAY_USEC 20000ul
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#define EL_PATTERN_DELAY_MSEC 800u
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#define EL_PATTERN_LEN 10u
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#define EL_PATTERN_HALF_LEN (EL_PATTERN_LEN / 2)
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enum el15203000_command {
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/* for all LEDs */
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EL_OFF = '0',
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EL_ON = '1',
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/* for Screen LED */
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EL_SCREEN_BREATHING = '2',
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/* for Pipe LED */
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EL_PIPE_CASCADE = '2',
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EL_PIPE_INV_CASCADE = '3',
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EL_PIPE_BOUNCE = '4',
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EL_PIPE_INV_BOUNCE = '5',
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};
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struct el15203000_led {
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struct el15203000 *priv;
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struct led_classdev ldev;
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u32 reg;
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};
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struct el15203000 {
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struct device *dev;
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struct mutex lock;
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struct spi_device *spi;
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unsigned long delay;
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size_t count;
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struct el15203000_led leds[];
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};
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static int el15203000_cmd(struct el15203000_led *led, u8 brightness)
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{
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int ret;
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u8 cmd[2];
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size_t i;
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mutex_lock(&led->priv->lock);
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dev_dbg(led->priv->dev, "Set brightness of 0x%02x(%c) to 0x%02x(%c)",
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led->reg, led->reg, brightness, brightness);
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/* to avoid SPI mistiming with firmware we should wait some time */
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if (time_after(led->priv->delay, jiffies)) {
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dev_dbg(led->priv->dev, "Wait %luus to sync",
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EL_FW_DELAY_USEC);
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usleep_range(EL_FW_DELAY_USEC,
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EL_FW_DELAY_USEC + 1);
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}
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cmd[0] = led->reg;
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cmd[1] = brightness;
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for (i = 0; i < ARRAY_SIZE(cmd); i++) {
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if (i)
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usleep_range(EL_FW_DELAY_USEC,
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EL_FW_DELAY_USEC + 1);
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ret = spi_write(led->priv->spi, &cmd[i], sizeof(cmd[i]));
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if (ret) {
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dev_err(led->priv->dev,
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"spi_write() error %d", ret);
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break;
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}
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}
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led->priv->delay = jiffies + usecs_to_jiffies(EL_FW_DELAY_USEC);
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mutex_unlock(&led->priv->lock);
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return ret;
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}
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static int el15203000_set_blocking(struct led_classdev *ldev,
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enum led_brightness brightness)
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{
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struct el15203000_led *led = container_of(ldev,
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struct el15203000_led,
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ldev);
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return el15203000_cmd(led, brightness == LED_OFF ? EL_OFF : EL_ON);
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}
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static int el15203000_pattern_set_S(struct led_classdev *ldev,
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struct led_pattern *pattern,
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u32 len, int repeat)
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{
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struct el15203000_led *led = container_of(ldev,
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struct el15203000_led,
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ldev);
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if (repeat > 0 || len != 2 ||
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pattern[0].delta_t != 4000 || pattern[0].brightness != 0 ||
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pattern[1].delta_t != 4000 || pattern[1].brightness != 1)
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return -EINVAL;
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dev_dbg(led->priv->dev, "Breathing mode for 0x%02x(%c)",
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led->reg, led->reg);
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return el15203000_cmd(led, EL_SCREEN_BREATHING);
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}
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static bool is_cascade(const struct led_pattern *pattern, u32 len,
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bool inv, bool right)
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{
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int val, t;
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u32 i;
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if (len != EL_PATTERN_HALF_LEN)
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return false;
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val = right ? BIT(4) : BIT(0);
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for (i = 0; i < len; i++) {
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t = inv ? ~val & GENMASK(4, 0) : val;
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if (pattern[i].delta_t != EL_PATTERN_DELAY_MSEC ||
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pattern[i].brightness != t)
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return false;
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val = right ? val >> 1 : val << 1;
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}
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return true;
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}
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static bool is_bounce(const struct led_pattern *pattern, u32 len, bool inv)
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{
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if (len != EL_PATTERN_LEN)
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return false;
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return is_cascade(pattern, EL_PATTERN_HALF_LEN, inv, false) &&
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is_cascade(pattern + EL_PATTERN_HALF_LEN,
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EL_PATTERN_HALF_LEN, inv, true);
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}
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static int el15203000_pattern_set_P(struct led_classdev *ldev,
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struct led_pattern *pattern,
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u32 len, int repeat)
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{
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u8 cmd;
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struct el15203000_led *led = container_of(ldev,
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struct el15203000_led,
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ldev);
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if (repeat > 0)
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return -EINVAL;
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if (is_cascade(pattern, len, false, false)) {
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dev_dbg(led->priv->dev, "Cascade mode for 0x%02x(%c)",
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led->reg, led->reg);
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cmd = EL_PIPE_CASCADE;
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} else if (is_cascade(pattern, len, true, false)) {
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dev_dbg(led->priv->dev, "Inverse cascade mode for 0x%02x(%c)",
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led->reg, led->reg);
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cmd = EL_PIPE_INV_CASCADE;
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} else if (is_bounce(pattern, len, false)) {
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dev_dbg(led->priv->dev, "Bounce mode for 0x%02x(%c)",
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led->reg, led->reg);
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cmd = EL_PIPE_BOUNCE;
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} else if (is_bounce(pattern, len, true)) {
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dev_dbg(led->priv->dev, "Inverse bounce mode for 0x%02x(%c)",
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led->reg, led->reg);
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cmd = EL_PIPE_INV_BOUNCE;
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} else {
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dev_err(led->priv->dev, "Invalid hw_pattern for 0x%02x(%c)!",
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led->reg, led->reg);
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return -EINVAL;
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}
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return el15203000_cmd(led, cmd);
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}
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static int el15203000_pattern_clear(struct led_classdev *ldev)
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{
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struct el15203000_led *led = container_of(ldev,
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struct el15203000_led,
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ldev);
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return el15203000_cmd(led, EL_OFF);
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}
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static int el15203000_probe_dt(struct el15203000 *priv)
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{
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struct el15203000_led *led = priv->leds;
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struct fwnode_handle *child;
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int ret;
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device_for_each_child_node(priv->dev, child) {
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struct led_init_data init_data = {};
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ret = fwnode_property_read_u32(child, "reg", &led->reg);
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if (ret) {
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dev_err(priv->dev, "LED without ID number");
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fwnode_handle_put(child);
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break;
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}
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if (led->reg > U8_MAX) {
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dev_err(priv->dev, "LED value %d is invalid", led->reg);
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fwnode_handle_put(child);
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return -EINVAL;
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}
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fwnode_property_read_string(child, "linux,default-trigger",
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&led->ldev.default_trigger);
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led->priv = priv;
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led->ldev.max_brightness = LED_ON;
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led->ldev.brightness_set_blocking = el15203000_set_blocking;
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if (led->reg == 'S') {
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led->ldev.pattern_set = el15203000_pattern_set_S;
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led->ldev.pattern_clear = el15203000_pattern_clear;
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} else if (led->reg == 'P') {
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led->ldev.pattern_set = el15203000_pattern_set_P;
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led->ldev.pattern_clear = el15203000_pattern_clear;
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}
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init_data.fwnode = child;
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ret = devm_led_classdev_register_ext(priv->dev, &led->ldev,
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&init_data);
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if (ret) {
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dev_err(priv->dev,
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"failed to register LED device %s, err %d",
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led->ldev.name, ret);
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fwnode_handle_put(child);
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break;
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}
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led++;
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}
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return ret;
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}
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static int el15203000_probe(struct spi_device *spi)
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{
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struct el15203000 *priv;
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size_t count;
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count = device_get_child_node_count(&spi->dev);
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if (!count) {
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dev_err(&spi->dev, "LEDs are not defined in device tree!");
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return -ENODEV;
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}
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priv = devm_kzalloc(&spi->dev, struct_size(priv, leds, count),
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GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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mutex_init(&priv->lock);
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priv->count = count;
|
||||
priv->dev = &spi->dev;
|
||||
priv->spi = spi;
|
||||
priv->delay = jiffies -
|
||||
usecs_to_jiffies(EL_FW_DELAY_USEC);
|
||||
|
||||
spi_set_drvdata(spi, priv);
|
||||
|
||||
return el15203000_probe_dt(priv);
|
||||
}
|
||||
|
||||
static int el15203000_remove(struct spi_device *spi)
|
||||
{
|
||||
struct el15203000 *priv = spi_get_drvdata(spi);
|
||||
|
||||
mutex_destroy(&priv->lock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id el15203000_dt_ids[] = {
|
||||
{ .compatible = "crane,el15203000", },
|
||||
{},
|
||||
};
|
||||
|
||||
MODULE_DEVICE_TABLE(of, el15203000_dt_ids);
|
||||
|
||||
static struct spi_driver el15203000_driver = {
|
||||
.probe = el15203000_probe,
|
||||
.remove = el15203000_remove,
|
||||
.driver = {
|
||||
.name = KBUILD_MODNAME,
|
||||
.of_match_table = el15203000_dt_ids,
|
||||
},
|
||||
};
|
||||
|
||||
module_spi_driver(el15203000_driver);
|
||||
|
||||
MODULE_AUTHOR("Oleh Kravchenko <oleg@kaa.org.ua>");
|
||||
MODULE_DESCRIPTION("el15203000 LED driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_ALIAS("spi:el15203000");
|
||||
Loading…
Reference in New Issue