1/* drivers/leds/leds-s3c24xx.c 2 * 3 * (c) 2006 Simtec Electronics 4 * http://armlinux.simtec.co.uk/ 5 * Ben Dooks <ben@simtec.co.uk> 6 * 7 * S3C24XX - LEDs GPIO driver 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12*/ 13 14#include <linux/kernel.h> 15#include <linux/init.h> 16#include <linux/platform_device.h> 17#include <linux/leds.h> 18 19#include <asm/hardware.h> 20#include <asm/arch/regs-gpio.h> 21#include <asm/arch/leds-gpio.h> 22 23/* our context */ 24 25struct s3c24xx_gpio_led { 26 struct led_classdev cdev; 27 struct s3c24xx_led_platdata *pdata; 28}; 29 30static inline struct s3c24xx_gpio_led *pdev_to_gpio(struct platform_device *dev) 31{ 32 return platform_get_drvdata(dev); 33} 34 35static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev) 36{ 37 return container_of(led_cdev, struct s3c24xx_gpio_led, cdev); 38} 39 40static void s3c24xx_led_set(struct led_classdev *led_cdev, 41 enum led_brightness value) 42{ 43 struct s3c24xx_gpio_led *led = to_gpio(led_cdev); 44 struct s3c24xx_led_platdata *pd = led->pdata; 45 46 /* there will be a sort delay between setting the output and 47 * going from output to input when using tristate. */ 48 49 s3c2410_gpio_setpin(pd->gpio, (value ? 1 : 0) ^ 50 (pd->flags & S3C24XX_LEDF_ACTLOW)); 51 52 if (pd->flags & S3C24XX_LEDF_TRISTATE) 53 s3c2410_gpio_cfgpin(pd->gpio, 54 value ? S3C2410_GPIO_OUTPUT : S3C2410_GPIO_INPUT); 55 56} 57 58static int s3c24xx_led_remove(struct platform_device *dev) 59{ 60 struct s3c24xx_gpio_led *led = pdev_to_gpio(dev); 61 62 led_classdev_unregister(&led->cdev); 63 kfree(led); 64 65 return 0; 66} 67 68static int s3c24xx_led_probe(struct platform_device *dev) 69{ 70 struct s3c24xx_led_platdata *pdata = dev->dev.platform_data; 71 struct s3c24xx_gpio_led *led; 72 int ret; 73 74 led = kzalloc(sizeof(struct s3c24xx_gpio_led), GFP_KERNEL); 75 if (led == NULL) { 76 dev_err(&dev->dev, "No memory for device\n"); 77 return -ENOMEM; 78 } 79 80 platform_set_drvdata(dev, led); 81 82 led->cdev.brightness_set = s3c24xx_led_set; 83 led->cdev.default_trigger = pdata->def_trigger; 84 led->cdev.name = pdata->name; 85 86 led->pdata = pdata; 87 88 /* no point in having a pull-up if we are always driving */ 89 90 if (pdata->flags & S3C24XX_LEDF_TRISTATE) { 91 s3c2410_gpio_setpin(pdata->gpio, 0); 92 s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_INPUT); 93 } else { 94 s3c2410_gpio_pullup(pdata->gpio, 0); 95 s3c2410_gpio_setpin(pdata->gpio, 0); 96 s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_OUTPUT); 97 } 98 99 /* register our new led device */ 100 101 ret = led_classdev_register(&dev->dev, &led->cdev); 102 if (ret < 0) { 103 dev_err(&dev->dev, "led_classdev_register failed\n"); 104 goto exit_err1; 105 } 106 107 return 0; 108 109 exit_err1: 110 kfree(led); 111 return ret; 112} 113 114 115#ifdef CONFIG_PM 116static int s3c24xx_led_suspend(struct platform_device *dev, pm_message_t state) 117{ 118 struct s3c24xx_gpio_led *led = pdev_to_gpio(dev); 119 120 led_classdev_suspend(&led->cdev); 121 return 0; 122} 123 124static int s3c24xx_led_resume(struct platform_device *dev) 125{ 126 struct s3c24xx_gpio_led *led = pdev_to_gpio(dev); 127 128 led_classdev_resume(&led->cdev); 129 return 0; 130} 131#else 132#define s3c24xx_led_suspend NULL 133#define s3c24xx_led_resume NULL 134#endif 135 136static struct platform_driver s3c24xx_led_driver = { 137 .probe = s3c24xx_led_probe, 138 .remove = s3c24xx_led_remove, 139 .suspend = s3c24xx_led_suspend, 140 .resume = s3c24xx_led_resume, 141 .driver = { 142 .name = "s3c24xx_led", 143 .owner = THIS_MODULE, 144 }, 145}; 146 147static int __init s3c24xx_led_init(void) 148{ 149 return platform_driver_register(&s3c24xx_led_driver); 150} 151 152static void __exit s3c24xx_led_exit(void) 153{ 154 platform_driver_unregister(&s3c24xx_led_driver); 155} 156 157module_init(s3c24xx_led_init); 158module_exit(s3c24xx_led_exit); 159 160MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); 161MODULE_DESCRIPTION("S3C24XX LED driver"); 162MODULE_LICENSE("GPL"); 163