[PATCH] S3C24XX GPIO LED support (54bdc470) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/leds/Kconfig

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		@@ -59,6 +59,13 @@ config LEDS_TOSA
		This option enables support for the LEDs on Sharp Zaurus
		SL-6000 series.

		config LEDS_S3C24XX
		tristate "LED Support for Samsung S3C24XX GPIO LEDs"
		depends on LEDS_CLASS && ARCH_S3C2410
		help
		This option enables support for LEDs connected to GPIO lines
		on Samsung S3C24XX series CPUs, such as the S3C2410 and S3C2440.

		config LEDS_TRIGGER_TIMER
		tristate "LED Timer Trigger"
		depends LEDS_TRIGGERS

drivers/leds/Makefile

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		@@ -10,6 +10,7 @@ obj-$(CONFIG_LEDS_LOCOMO) += leds-locomo.o
		obj-$(CONFIG_LEDS_SPITZ) += leds-spitz.o
		obj-$(CONFIG_LEDS_IXP4XX) += leds-ixp4xx-gpio.o
		obj-$(CONFIG_LEDS_TOSA) += leds-tosa.o
		obj-$(CONFIG_LEDS_S3C24XX) += leds-s3c24xx.o

		# LED Triggers
		obj-$(CONFIG_LEDS_TRIGGER_TIMER) += ledtrig-timer.o

drivers/leds/leds-s3c24xx.c

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		/* drivers/leds/leds-s3c24xx.c
		*
		* (c) 2006 Simtec Electronics
		* http://armlinux.simtec.co.uk/
		* Ben Dooks <ben@simtec.co.uk>
		*
		* S3C24XX - LEDs GPIO driver
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*/

		#include <linux/config.h>
		#include <linux/kernel.h>
		#include <linux/init.h>
		#include <linux/platform_device.h>
		#include <linux/leds.h>

		#include <asm/arch/hardware.h>
		#include <asm/arch/regs-gpio.h>
		#include <asm/arch/leds-gpio.h>

		/* our context */

		struct s3c24xx_gpio_led {
		struct led_classdev cdev;
		struct s3c24xx_led_platdata *pdata;
		};

		static inline struct s3c24xx_gpio_led pdev_to_gpio(struct platform_device dev)
		{
		return platform_get_drvdata(dev);
		}

		static inline struct s3c24xx_gpio_led to_gpio(struct led_classdev led_cdev)
		{
		return container_of(led_cdev, struct s3c24xx_gpio_led, cdev);
		}

		static void s3c24xx_led_set(struct led_classdev *led_cdev,
		enum led_brightness value)
		{
		struct s3c24xx_gpio_led *led = to_gpio(led_cdev);
		struct s3c24xx_led_platdata *pd = led->pdata;

		/* there will be a sort delay between setting the output and
		* going from output to input when using tristate. */

		s3c2410_gpio_setpin(pd->gpio, (value ? 1 : 0) ^
		(pd->flags & S3C24XX_LEDF_ACTLOW));

		if (pd->flags & S3C24XX_LEDF_TRISTATE)
		s3c2410_gpio_cfgpin(pd->gpio,
		value ? S3C2410_GPIO_OUTPUT : S3C2410_GPIO_INPUT);

		}

		static int s3c24xx_led_remove(struct platform_device *dev)
		{
		struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);

		led_classdev_unregister(&led->cdev);
		kfree(led);

		return 0;
		}

		static int s3c24xx_led_probe(struct platform_device *dev)
		{
		struct s3c24xx_led_platdata *pdata = dev->dev.platform_data;
		struct s3c24xx_gpio_led *led;
		int ret;

		led = kzalloc(sizeof(struct s3c24xx_gpio_led), GFP_KERNEL);
		if (led == NULL) {
		dev_err(&dev->dev, "No memory for device\n");
		return -ENOMEM;
		}

		platform_set_drvdata(dev, led);

		led->cdev.brightness_set = s3c24xx_led_set;
		led->cdev.default_trigger = pdata->def_trigger;
		led->cdev.name = pdata->name;

		led->pdata = pdata;

		/* no point in having a pull-up if we are always driving */

		if (pdata->flags & S3C24XX_LEDF_TRISTATE) {
		s3c2410_gpio_setpin(pdata->gpio, 0);
		s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_INPUT);
		} else {
		s3c2410_gpio_pullup(pdata->gpio, 0);
		s3c2410_gpio_setpin(pdata->gpio, 0);
		s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_OUTPUT);
		}

		/* register our new led device */

		ret = led_classdev_register(&dev->dev, &led->cdev);
		if (ret < 0) {
		dev_err(&dev->dev, "led_classdev_register failed\n");
		goto exit_err1;
		}

		return 0;

		exit_err1:
		kfree(led);
		return ret;
		}


		#ifdef CONFIG_PM
		static int s3c24xx_led_suspend(struct platform_device *dev, pm_message_t state)
		{
		struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);

		led_classdev_suspend(&led->cdev);
		return 0;
		}

		static int s3c24xx_led_resume(struct platform_device *dev)
		{
		struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);

		led_classdev_resume(&led->cdev);
		return 0;
		}
		#else
		#define s3c24xx_led_suspend NULL
		#define s3c24xx_led_resume NULL
		#endif

		static struct platform_driver s3c24xx_led_driver = {
		.probe = s3c24xx_led_probe,
		.remove = s3c24xx_led_remove,
		.suspend = s3c24xx_led_suspend,
		.resume = s3c24xx_led_resume,
		.driver = {
		.name = "s3c24xx_led",
		.owner = THIS_MODULE,
		},
		};

		static int __init s3c24xx_led_init(void)
		{
		return platform_driver_register(&s3c24xx_led_driver);
		}

		static void __exit s3c24xx_led_exit(void)
		{
		platform_driver_unregister(&s3c24xx_led_driver);
		}

		module_init(s3c24xx_led_init);
		module_exit(s3c24xx_led_exit);

		MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
		MODULE_DESCRIPTION("S3C24XX LED driver");
		MODULE_LICENSE("GPL");

include/asm-arm/arch-s3c2410/leds-gpio.h

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		/* linux/include/asm-arm/arch-s3c2410/leds-gpio.h
		*
		* (c) 2006 Simtec Electronics
		* http://armlinux.simtec.co.uk/
		* Ben Dooks <ben@simtec.co.uk>
		*
		* S3C24XX - LEDs GPIO connector
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*/

		#ifndef __ASM_ARCH_LEDSGPIO_H
		#define __ASM_ARCH_LEDSGPIO_H "leds-gpio.h"

		#define S3C24XX_LEDF_ACTLOW (1<<0) /* LED is on when GPIO low */
		#define S3C24XX_LEDF_TRISTATE (1<<1) /* tristate to turn off */

		struct s3c24xx_led_platdata {
		unsigned int gpio;
		unsigned int flags;

		char *name;
		char *def_trigger;
		};

		#endif /* __ASM_ARCH_LEDSGPIO_H */