leds-s3c24xx.c revision ec976d6eb021dc8f2994248c310a41540f4756bd
154bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks/* drivers/leds/leds-s3c24xx.c 254bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks * 354bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks * (c) 2006 Simtec Electronics 454bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks * http://armlinux.simtec.co.uk/ 554bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks * Ben Dooks <ben@simtec.co.uk> 654bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks * 754bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks * S3C24XX - LEDs GPIO driver 854bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks * 954bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks * This program is free software; you can redistribute it and/or modify 1054bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks * it under the terms of the GNU General Public License version 2 as 1154bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks * published by the Free Software Foundation. 1254bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks*/ 1354bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 1454bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks#include <linux/kernel.h> 1554bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks#include <linux/init.h> 1654bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks#include <linux/platform_device.h> 1754bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks#include <linux/leds.h> 18ec976d6eb021dc8f2994248c310a41540f4756bdBen Dooks#include <linux/gpio.h> 1954bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 20a09e64fbc0094e3073dbb09c3b4bfe4ab669244bRussell King#include <mach/hardware.h> 21a09e64fbc0094e3073dbb09c3b4bfe4ab669244bRussell King#include <mach/regs-gpio.h> 22a09e64fbc0094e3073dbb09c3b4bfe4ab669244bRussell King#include <mach/leds-gpio.h> 2354bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 2454bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks/* our context */ 2554bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 2654bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooksstruct s3c24xx_gpio_led { 2754bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks struct led_classdev cdev; 2854bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks struct s3c24xx_led_platdata *pdata; 2954bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks}; 3054bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 3154bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooksstatic inline struct s3c24xx_gpio_led *pdev_to_gpio(struct platform_device *dev) 3254bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks{ 3354bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks return platform_get_drvdata(dev); 3454bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks} 3554bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 3654bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooksstatic inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev) 3754bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks{ 3854bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks return container_of(led_cdev, struct s3c24xx_gpio_led, cdev); 3954bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks} 4054bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 4154bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooksstatic void s3c24xx_led_set(struct led_classdev *led_cdev, 4254bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks enum led_brightness value) 4354bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks{ 4454bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks struct s3c24xx_gpio_led *led = to_gpio(led_cdev); 4554bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks struct s3c24xx_led_platdata *pd = led->pdata; 4654bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 474a739d55c21298639df2ddeab332b8afef125ebcUwe Kleine-König /* there will be a short delay between setting the output and 4854bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks * going from output to input when using tristate. */ 4954bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 5054bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks s3c2410_gpio_setpin(pd->gpio, (value ? 1 : 0) ^ 5154bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks (pd->flags & S3C24XX_LEDF_ACTLOW)); 5254bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 5354bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks if (pd->flags & S3C24XX_LEDF_TRISTATE) 5454bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks s3c2410_gpio_cfgpin(pd->gpio, 554d404fd5c51772720e9c72aa3185bd5119bc6e69Németh Márton value ? S3C2410_GPIO_OUTPUT : S3C2410_GPIO_INPUT); 5654bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 5754bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks} 5854bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 5954bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooksstatic int s3c24xx_led_remove(struct platform_device *dev) 6054bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks{ 6154bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks struct s3c24xx_gpio_led *led = pdev_to_gpio(dev); 6254bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 6354bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks led_classdev_unregister(&led->cdev); 6454bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks kfree(led); 6554bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 6654bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks return 0; 6754bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks} 6854bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 6954bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooksstatic int s3c24xx_led_probe(struct platform_device *dev) 7054bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks{ 7154bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks struct s3c24xx_led_platdata *pdata = dev->dev.platform_data; 7254bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks struct s3c24xx_gpio_led *led; 7354bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks int ret; 7454bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 7554bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks led = kzalloc(sizeof(struct s3c24xx_gpio_led), GFP_KERNEL); 7654bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks if (led == NULL) { 7754bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks dev_err(&dev->dev, "No memory for device\n"); 7854bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks return -ENOMEM; 7954bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks } 8054bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 8154bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks platform_set_drvdata(dev, led); 8254bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 8354bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks led->cdev.brightness_set = s3c24xx_led_set; 8454bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks led->cdev.default_trigger = pdata->def_trigger; 8554bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks led->cdev.name = pdata->name; 86859cb7f2a4244ea6da206d3fe9cc8a6810947a68Richard Purdie led->cdev.flags |= LED_CORE_SUSPENDRESUME; 8754bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 8854bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks led->pdata = pdata; 8954bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 9054bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks /* no point in having a pull-up if we are always driving */ 9154bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 9254bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks if (pdata->flags & S3C24XX_LEDF_TRISTATE) { 9354bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks s3c2410_gpio_setpin(pdata->gpio, 0); 9454bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_INPUT); 9554bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks } else { 9654bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks s3c2410_gpio_pullup(pdata->gpio, 0); 9754bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks s3c2410_gpio_setpin(pdata->gpio, 0); 9854bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_OUTPUT); 9954bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks } 10054bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 10154bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks /* register our new led device */ 10254bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 10354bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks ret = led_classdev_register(&dev->dev, &led->cdev); 10454bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks if (ret < 0) { 10554bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks dev_err(&dev->dev, "led_classdev_register failed\n"); 106bfb2cc48f077017f6224e725886d07d76e3f96dbZhenwen Xu kfree(led); 107bfb2cc48f077017f6224e725886d07d76e3f96dbZhenwen Xu return ret; 10854bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks } 10954bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 11054bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks return 0; 11154bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks} 11254bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 11354bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooksstatic struct platform_driver s3c24xx_led_driver = { 11454bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks .probe = s3c24xx_led_probe, 11554bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks .remove = s3c24xx_led_remove, 11654bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks .driver = { 11754bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks .name = "s3c24xx_led", 11854bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks .owner = THIS_MODULE, 11954bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks }, 12054bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks}; 12154bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 12254bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooksstatic int __init s3c24xx_led_init(void) 12354bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks{ 12454bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks return platform_driver_register(&s3c24xx_led_driver); 12554bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks} 12654bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 12754bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooksstatic void __exit s3c24xx_led_exit(void) 12854bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks{ 1294d404fd5c51772720e9c72aa3185bd5119bc6e69Németh Márton platform_driver_unregister(&s3c24xx_led_driver); 13054bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks} 13154bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 13254bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooksmodule_init(s3c24xx_led_init); 13354bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooksmodule_exit(s3c24xx_led_exit); 13454bdc470100b9d8ffd349a3ebe23013c25affddfBen Dooks 13554bdc470100b9d8ffd349a3ebe23013c25affddfBen DooksMODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); 13654bdc470100b9d8ffd349a3ebe23013c25affddfBen DooksMODULE_DESCRIPTION("S3C24XX LED driver"); 13754bdc470100b9d8ffd349a3ebe23013c25affddfBen DooksMODULE_LICENSE("GPL"); 1383c4ded9715c05724939c9a4bd72555c2ade71d97Kay SieversMODULE_ALIAS("platform:s3c24xx_led"); 139