s3c2410state.c

s3c2410驱动文件入门例程1

/*
 * s3c2410-state.c
 *
 * S3C2410 state_led
 *
 * Date  : $Date: 2006/12/13 17:15:00 $ 
 *
 * $Revision: 1.2.1.1 $
 *
 */


#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>

#include <linux/miscdevice.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/poll.h>
#include <linux/spinlock.h>
#include <linux/irq.h>
#include <linux/delay.h>

#include <asm/hardware.h>

#define DEVICE_NAME	"state"
#define STATE_MAJOR 230


static int STATE_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
	int key,frequency,count,n,m,i,j;
	
	switch(cmd) 
	{
	case 1:
		write_gpio_bit(GPIO_A15, 0);
		break;
		
		 
	case 0:

		write_gpio_bit(GPIO_A15, 1);
		break;     
		
	default:
		return -EINVAL;
		break;
		
	}
	
	return 0;
}


static struct file_operations STATE_fops = {
	owner:	THIS_MODULE,
	ioctl:  STATE_ioctl,
};


static devfs_handle_t devfs_handle;
static int __init STATE_init(void)
{
	int ret;
	int k;

	ret = register_chrdev(STATE_MAJOR, DEVICE_NAME, &STATE_fops);
	if (ret < 0) 
	{
	  printk(DEVICE_NAME "Can't register major number\n");
	  return ret;
	}
	devfs_handle = devfs_register(NULL, DEVICE_NAME, DEVFS_FL_DEFAULT,
				STATE_MAJOR, 0, S_IFCHR | S_IRUSR | S_IWUSR, &STATE_fops, NULL);
	GPACON = GPACON & ~(1<<15);
        write_gpio_bit(GPIO_A15, 0);


	printk("\nARMSYS-"DEVICE_NAME " initialized, it will indicate the status of 2410MU.\n");
	return 0;
}


static void __exit STATE_exit(void)
{
	devfs_unregister(devfs_handle);
	unregister_chrdev(STATE_MAJOR, DEVICE_NAME);
}

module_init(STATE_init);
module_exit(STATE_exit);