test_led.c

基于arm-s3c2410 led驱动程序 基于arm-s3c2410 led驱动程序

#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_AUTHOR("Luofuchong"); 
MODULE_LICENSE("Dual BSD/GPL"); 
MODULE_ALIAS("led"); 
 
static unsigned long led_table [] = { 
S3C2410_GPF4, 
S3C2410_GPF5, 
S3C2410_GPF6, 
S3C2410_GPF7, 
        S3C2410_GPF4_OUTP, 
        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); 
break; 
        default: 
return -EINVAL; 
} 
        return 0; 
} 
 
static struct file_operations leds_fops = { 
.owner = THIS_MODULE, 
.ioctl = leds_ioctl, 
}; 
 
static struct class *led_class; 
 
static int __init leds_init(void) 
{ 
  int err = 0; 
          int i;   
           
          if(register_chrdev(LED_MAJOR,"led",&leds_fops)){ 
            printk("led driver:Unable to register driver\n"); 
            return -ENODEV; 
          } 
          
 //         led_class = class_create(THIS_MODULE, "led"); 
          if(IS_ERR(led_class)){ 
                 err = PTR_ERR(led_class); 
                 goto out_chrdev; 
          } 
  //        class_device_create(led_class,MKDEV(LED_MAJOR, 0),NULL,"led"); 
           
          err = devfs_mk_cdev(MKDEV(LED_MAJOR,0), 
                        S_IFCHR | S_IRUGO | S_IWUSR,"led"); 
          if(err) 
                  goto out_class; 
 
          for(i=0;i<4;i++){ 
                  s3c2410_gpio_cfgpin(led_table[i],led_table[i+4]); 
                  s3c2410_gpio_setpin(led_table[i],1); 
          } 
  printk("led driver initialized\n"); 
  goto out; 
 
out_class: 
//        class_device_destroy(led_class,MKDEV(LED_MAJOR, 0)); 
 //       class_destroy(led_class); 
out_chrdev: 
        unregister_chrdev(LED_MAJOR, "led"); 
out: 
        return err; 
} 
 
static void __exit leds_exit(void) 
{ 
  //      class_device_destroy(led_class,MKDEV(LED_MAJOR,0)); 
   //     class_destroy(led_class); 
        unregister_chrdev(LED_MAJOR,"led"); 
        devfs_remove("led"); 
        printk("led driver removed\n"); 
} 
 
module_init(leds_init); 
module_exit(leds_exit);