leds: add led driver for Bachmann's ot200 (e9a4593c) · Commits · 戴 / test

drivers/leds/Kconfig

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Original line number	Diff line number	Diff line
		@@ -403,6 +403,13 @@ config LEDS_MAX8997
		This option enables support for on-chip LED drivers on
		MAXIM MAX8997 PMIC.

		config LEDS_OT200
		tristate "LED support for the Bachmann OT200"
		depends on LEDS_CLASS && HAS_IOMEM
		help
		This option enables support for the LEDs on the Bachmann OT200.
		Say Y to enable LEDs on the Bachmann OT200.

		config LEDS_TRIGGERS
		bool "LED Trigger support"
		depends on LEDS_CLASS

drivers/leds/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -28,6 +28,7 @@ obj-$(CONFIG_LEDS_LP5523) += leds-lp5523.o
		obj-$(CONFIG_LEDS_TCA6507) += leds-tca6507.o
		obj-$(CONFIG_LEDS_CLEVO_MAIL) += leds-clevo-mail.o
		obj-$(CONFIG_LEDS_HP6XX) += leds-hp6xx.o
		obj-$(CONFIG_LEDS_OT200) += leds-ot200.o
		obj-$(CONFIG_LEDS_FSG) += leds-fsg.o
		obj-$(CONFIG_LEDS_PCA955X) += leds-pca955x.o
		obj-$(CONFIG_LEDS_DA903X) += leds-da903x.o

drivers/leds/leds-ot200.c

0 → 100644

+171 −0

Original line number	Diff line number	Diff line
		/*
		* 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/init.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(7),
		},
		{
		.name = "led_2",
		.port = 0x49,
		.mask = BIT(6),
		},
		{
		.name = "led_3",
		.port = 0x49,
		.mask = BIT(5),
		},
		{
		.name = "led_4",
		.port = 0x49,
		.mask = BIT(4),
		},
		{
		.name = "led_5",
		.port = 0x49,
		.mask = BIT(3),
		},
		{
		.name = "led_6",
		.port = 0x49,
		.mask = BIT(2),
		},
		{
		.name = "led_7",
		.port = 0x49,
		.mask = BIT(1),
		}
		};

		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);
		}

		static int __devinit 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 = led_classdev_register(&pdev->dev, &leds[i].cdev);
		if (ret < 0)
		goto err;
		}

		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;

		err:
		for (i = i - 1; i >= 0; i--)
		led_classdev_unregister(&leds[i].cdev);

		return ret;
		}

		static int __devexit ot200_led_remove(struct platform_device *pdev)
		{
		int i;

		for (i = 0; i < ARRAY_SIZE(leds); i++)
		led_classdev_unregister(&leds[i].cdev);

		return 0;
		}

		static struct platform_driver ot200_led_driver = {
		.probe = ot200_led_probe,
		.remove = __devexit_p(ot200_led_remove),
		.driver = {
		.name = "leds-ot200",
		.owner = THIS_MODULE,
		},
		};

		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");

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