| /* 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 <linux/module.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; |
| int state = (value ? 1 : 0) ^ (pd->flags & S3C24XX_LEDF_ACTLOW); |
| |
| /* there will be a short delay between setting the output and |
| * going from output to input when using tristate. */ |
| |
| gpio_set_value(pd->gpio, state); |
| |
| if (pd->flags & S3C24XX_LEDF_TRISTATE) { |
| if (value) |
| gpio_direction_output(pd->gpio, state); |
| else |
| gpio_direction_input(pd->gpio); |
| } |
| } |
| |
| static int s3c24xx_led_remove(struct platform_device *dev) |
| { |
| struct s3c24xx_gpio_led *led = pdev_to_gpio(dev); |
| |
| led_classdev_unregister(&led->cdev); |
| gpio_free(led->pdata->gpio); |
| |
| 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 = devm_kzalloc(&dev->dev, 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; |
| |
| ret = gpio_request(pdata->gpio, "S3C24XX_LED"); |
| if (ret < 0) |
| return ret; |
| |
| /* no point in having a pull-up if we are always driving */ |
| |
| s3c_gpio_setpull(pdata->gpio, S3C_GPIO_PULL_NONE); |
| |
| if (pdata->flags & S3C24XX_LEDF_TRISTATE) |
| gpio_direction_input(pdata->gpio); |
| else |
| gpio_direction_output(pdata->gpio, |
| pdata->flags & S3C24XX_LEDF_ACTLOW ? 1 : 0); |
| |
| /* 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"); |
| |
| return ret; |
| } |
| |
| static struct platform_driver s3c24xx_led_driver = { |
| .probe = s3c24xx_led_probe, |
| .remove = s3c24xx_led_remove, |
| .driver = { |
| .name = "s3c24xx_led", |
| .owner = THIS_MODULE, |
| }, |
| }; |
| |
| module_platform_driver(s3c24xx_led_driver); |
| |
| MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); |
| MODULE_DESCRIPTION("S3C24XX LED driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("platform:s3c24xx_led"); |