led.c

FS2410板的led驱动

//#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/delay.h> 
 
#include <asm/hardware.h> 
#include <asm/arch/regs-gpio.h> 
#include <linux/device.h> 
//#include <linux/devfs_fs_kernel.h> 
#include <linux/types.h> 
#include <linux/cdev.h> 
#include <linux/errno.h> 
#include <asm/uaccess.h> 

#define  DEVICE_NAME "led" 
#define  LED_MAJOR 233 


MODULE_LICENSE("GPL"); 
MODULE_ALIAS("led"); 
 
static unsigned long led_table [] = { 
S3C2410_GPF4,		//IO define
S3C2410_GPF5, 
S3C2410_GPF6, 
S3C2410_GPF7, 
S3C2410_GPF4_OUTP, 	//IO pullup define
S3C2410_GPF5_OUTP, 
S3C2410_GPF6_OUTP, 
S3C2410_GPF7_OUTP, 
}; 
 
 
static int leds_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) 
{ 
switch(cmd) { 
	case 0: 
	case 1: 
		if (arg > 3) { 
			return -EINVAL; 
		} 
		s3c2410_gpio_setpin(led_table[arg],!cmd);//send 0 to led IO,so led is on
		break; 
        default: 
		return -EINVAL; 
} 
        return 0; 
} 
 
static struct file_operations leds_fops = { 
.owner = THIS_MODULE, 
.ioctl = leds_ioctl, 			//define ioctl
}; 
 
 
static int __init leds_init(void) 
{ 
          int i;   
           
          if(register_chrdev(LED_MAJOR,"led",&leds_fops))//register /dev/led with leds_fops OPERATE
	  { 
            printk("led driver:Unable to register driver\n"); 
            return -ENODEV; 
          } 
          
          for(i=0;i<4;i++){ 
                  s3c2410_gpio_cfgpin(led_table[i],led_table[i+4]); //set all LED IO mode to PULLUP
                  s3c2410_gpio_setpin(led_table[i],1); 	//send 1 to all LED IO,close all leds.
          } 
  	  printk("led driver initialized\n"); 

} 
 
static void __exit leds_exit(void) 
{ 
        unregister_chrdev(LED_MAJOR,"led"); //unregister module
        printk("led driver removed\n"); 
} 
 
module_init(leds_init); 
module_exit(leds_exit);