#define DEVICE_NAME "led"
#define DEVICE_MAJOR 212
static int led_major=DEVICE_MAJOR;

#define LED1 S3C2410_GPB5
#define LED1_OUTP S3C2410_GPB5_OUTP

#define LED_ON 0
#define LED_OFF 1

struct s3c2410_led_dev
{
 struct cdev cdev;
 int status;
};

static struct s3c2410_led_dev dev;

void s3c2410_led_InitIO(void);

void s3c2410_led_InitIO(void)
{
  s3c2410_gpio_cfgpin(LED1,LED1_OUTP);
  s3c2410_gpio_setpin(LED1,LED_OFF);
}

static int s3c2410_led_open(struct inode *inode,struct file *filp)
{
 return 0;
}

static int s3c2410_led_release(struct inode *inode,struct file *filp)
{
 return 0;
}

static int s3c2410_led_ioctl(struct inode *inode,struct file *filp,unsigned int cmd ,unsigned long arg)
{
 switch (cmd)
 {
  case LED_ON:
   s3c2410_gpio_setpin(LED1,LED_ON);
   dev.status=1;
   break;
  case LED_OFF:
   s3c2410_gpio_setpin(LED1,LED_OFF);
   dev.status=0;
   break;
  default:
   return -EINVAL;
 }
 return 0;
}

static ssize_t s3c2410_led_read(struct file *filp,char *buffer,size_t count,loff_t *ppos)
{
 put_user(dev.status,(int *)buffer);
 return 1;
}

static ssize_t s3c2410_led_write(struct file *filp,char *buffer, size_t count,loff_t *ppos)
{
 get_user(dev.status,(int *)buffer);
 if(dev.status==0)
  s3c2410_gpio_setpin(LED1,LED_OFF);
 else if(dev.status==1)
  s3c2410_gpio_setpin(LED1,LED_ON);
 return 1;
}

static struct file_operations s3c2410_led_fops={
 .owner =THIS_MODULE,
 .open =s3c2410_led_open,
 .release=s3c2410_led_release,
 .ioctl =s3c2410_led_ioctl,
 .read =s3c2410_led_read,
 .write =s3c2410_led_write,
};

static void led_setup_cdev(void)
{
 int err,devno=MKDEV(led_major,0);
 cdev_init(&dev.cdev,&s3c2410_led_fops);
 dev.cdev.owner=THIS_MODULE;
 dev.cdev.ops=&s3c2410_led_fops;
 err=cdev_add(&dev.cdev,devno,1);
 if(err)
 printk("Error %d adding LED %d",err);
}

static int s3c2410_led_init(void)
{
 int result;
 dev_t devno=MKDEV(led_major,0);
 if(led_major)
 result=register_chrdev_region(devno,1,DEVICE_NAME);
 else
 {
  result=alloc_chrdev_region(&devno,0,1,DEVICE_NAME);
  led_major=MAJOR(devno);
 }
 if(result<0)
  return result;
 led_setup_cdev();
 s3c2410_led_InitIO();
 dev.status=0;
 printk(DEVICE_NAME"initialized\n");
 return 0;
}

static void s3c2410_led_exit(void)
{
 cdev_del(&dev.cdev);
 unregister_chrdev_region(MKDEV(led_major,0),1);
}