/* 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/kernel.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/leds.h> #include <linux/gpio.h> #include <linux/slab.h> #include <mach/hardware.h> #include <mach/regs-gpio.h> #include <mach/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 short 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->cdev.flags |= LED_CORE_SUSPENDRESUME; 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"); kfree(led); return ret; } return 0; } static struct platform_driver s3c24xx_led_driver = { .probe = s3c24xx_led_probe, .remove = s3c24xx_led_remove, .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"); MODULE_ALIAS("platform:s3c24xx_led");