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Release 4.14 drivers/leds/leds-ot200.c

Directory: drivers/leds
/*
 * Bachmann ot200 leds driver.
 *
 * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
 *         Christian Gmeiner <christian.gmeiner@gmail.com>
 *
 * License: GPL as published by the FSF.
 */

#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/leds.h>
#include <linux/io.h>
#include <linux/module.h>



struct ot200_led {
	
struct led_classdev cdev;
	
const char *name;
	
unsigned long port;
	
u8 mask;
};

/*
 * The device has three leds on the back panel (led_err, led_init and led_run)
 * and can handle up to seven leds on the front panel.
 */


static struct ot200_led leds[] = {
	{
		.name = "led_run",
		.port = 0x5a,
		.mask = BIT(0),
        },
	{
		.name = "led_init",
		.port = 0x5a,
		.mask = BIT(1),
        },
	{
		.name = "led_err",
		.port = 0x5a,
		.mask = BIT(2),
        },
	{
		.name = "led_1",
		.port = 0x49,
		.mask = BIT(6),
        },
	{
		.name = "led_2",
		.port = 0x49,
		.mask = BIT(5),
        },
	{
		.name = "led_3",
		.port = 0x49,
		.mask = BIT(4),
        },
	{
		.name = "led_4",
		.port = 0x49,
		.mask = BIT(3),
        },
	{
		.name = "led_5",
		.port = 0x49,
		.mask = BIT(2),
        },
	{
		.name = "led_6",
		.port = 0x49,
		.mask = BIT(1),
        },
	{
		.name = "led_7",
		.port = 0x49,
		.mask = BIT(0),
        }
};

static DEFINE_SPINLOCK(value_lock);

/*
 * we need to store the current led states, as it is not
 * possible to read the current led state via inb().
 */

static u8 leds_back;

static u8 leds_front;


static void ot200_led_brightness_set(struct led_classdev *led_cdev, enum led_brightness value) { struct ot200_led *led = container_of(led_cdev, struct ot200_led, cdev); u8 *val; unsigned long flags; spin_lock_irqsave(&value_lock, flags); if (led->port == 0x49) val = &leds_front; else if (led->port == 0x5a) val = &leds_back; else BUG(); if (value == LED_OFF) *val &= ~led->mask; else *val |= led->mask; outb(*val, led->port); spin_unlock_irqrestore(&value_lock, flags); }

Contributors

PersonTokensPropCommitsCommitProp
Sebastian Andrzej Siewior117100.00%1100.00%
Total117100.00%1100.00%


static int ot200_led_probe(struct platform_device *pdev) { int i; int ret; for (i = 0; i < ARRAY_SIZE(leds); i++) { leds[i].cdev.name = leds[i].name; leds[i].cdev.brightness_set = ot200_led_brightness_set; ret = devm_led_classdev_register(&pdev->dev, &leds[i].cdev); if (ret < 0) return ret; } leds_front = 0; /* turn off all front leds */ leds_back = BIT(1); /* turn on init led */ outb(leds_front, 0x49); outb(leds_back, 0x5a); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Sebastian Andrzej Siewior11596.64%150.00%
Muhammad Falak R Wani43.36%150.00%
Total119100.00%2100.00%

static struct platform_driver ot200_led_driver = { .probe = ot200_led_probe, .driver = { .name = "leds-ot200", }, }; module_platform_driver(ot200_led_driver); MODULE_AUTHOR("Sebastian A. Siewior <bigeasy@linutronix.de>"); MODULE_DESCRIPTION("ot200 LED driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:leds-ot200");

Overall Contributors

PersonTokensPropCommitsCommitProp
Sebastian Andrzej Siewior53697.99%133.33%
Christian Gmeiner71.28%133.33%
Muhammad Falak R Wani40.73%133.33%
Total547100.00%3100.00%
Directory: drivers/leds
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