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分类: LINUX

2012-09-19 11:32:19

     //This file for explain how to use a simple driver  
 
 
#include
#include
#include
#include
#include
 
 
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
 
#include
 
// GPIO DEVICE MAJOR
#define SIMPLE_GPIO_MAJOR    151
#define OURS_GPIO_DEBUG  
 
#define VERSION         "PXA270RP-V1.00-090224"
//define GPIO STATUS
#define GPIO_ON  0
#define GPIO_OFF 1
 
struct led_dev
{  
 struct cdev cdev;
   unsigned char value;
};
struct led_dev *led_devp;
 
static int led_major=SIMPLE_GPIO_MAJOR;
 
static long *ioremap_addr;
 
void showversion(void)
{
        printk("*********************************************\n");
        printk("\t %s \t\n", VERSION);
        printk("*********************************************\n\n");
 
}
 
 
// ------------------- READ ------------------------
ssize_t SIMPLE_GPIO_read (struct file * file ,char * buf, size_t count, loff_t * f_ops)
{
    #ifdef OURS_GPIO_DEBUG
        printk ("SIMPLE_GPIO_read [ --kernel--]\n");
    #endif               
 
    return count;
}    
 
// ------------------- WRITE -----------------------
ssize_t SIMPLE_GPIO_write (struct file * file ,const char * buf, size_t count, loff_t * f_ops)
{
    int tmp_buf;
    #ifdef OURS_LED_DEBUG
            printk ("SIMPLE_LED_write [ --kernel--]\n");
        #endif
    
    // -------------------------------------------        
    tmp_buf = buf[1];
    tmp_buf = tmp_buf<<8;
    tmp_buf = tmp_buf | buf[0];
    #ifdef OURS_LED_DEBUG
                printk("tmp = %x\n",tmp_buf);    
    #endif
 
    outw(tmp_buf,ioremap_addr);
 
    return count;
}    
 
// ------------------- IOCTL -----------------------
ssize_t SIMPLE_GPIO_ioctl (struct inode * inode ,struct file * file, unsigned int cmd, unsigned long data)
{
     
#ifdef OURS_GPIO_DEBUG
            printk ("SIMPLE_GPIO_ioctl [ --kernel--]\n");
        #endif
 
    
    return 0;
}
 
// ------------------- OPEN ------------------------
ssize_t SIMPLE_GPIO_open (struct inode * inode ,struct file * file)
{
    #ifdef OURS_GPIO_DEBUG
            printk ("SIMPLE_GPIO_open [ --kernel--]\n");
        #endif
    
    
    return 0;
}    
 
// ------------------- RELEASE/CLOSE ---------------
ssize_t SIMPLE_GPIO_release (struct inode  * inode ,struct file * file)
{
    #ifdef OURS_GPIO_DEBUG
            printk ("SIMPLE_GPIO_release [ --kernel--]\n");
        #endif
 
    outw(0x0000,ioremap_addr); // close the led ary, all led off
 
    return 0;
}
 
// -------------------------------------------------
struct file_operations led_fops ={
 
    
    .open=        SIMPLE_GPIO_open,
    
    .read=        SIMPLE_GPIO_read,
    
    .write=        SIMPLE_GPIO_write,
    
    .ioctl=             SIMPLE_GPIO_ioctl,
    
    .release=    SIMPLE_GPIO_release,
    
};
 
static void led_setup_cdev(struct led_dev *dev,int index)
{  
 int err, devno=MKDEV(led_major,index);
    cdev_init(&dev->cdev,&led_fops);
     dev->cdev.owner=THIS_MODULE;
   dev->cdev.ops=&led_fops;
  err=cdev_add(&dev->cdev,devno,1);
    if(err)
    printk(KERN_NOTICE "Error %d adding led%d",err,index);
}
 
int led_init(void)
{
int result;
       static long *addr_status;
 
dev_t dev=MKDEV(led_major,0);
if(led_major)
 result=register_chrdev_region(dev,1,"led");
else
{
result=alloc_chrdev_region(&dev,0,1,"led");
led_major=MAJOR(dev);
}
if(result<0)
return result;
 
 
led_devp =kmalloc (sizeof(struct led_dev),GFP_KERNEL);
if (!led_devp)
{ result= - ENOMEM;
 goto fail_malloc;
}
memset(led_devp,0,sizeof(struct led_dev));
 
 led_setup_cdev(led_devp,0);
 
  addr_status=ioremap(0x08000018,0x0f);
          outb(0x20,addr_status);  //select cpld2         
       ioremap_addr=ioremap(0x0c00c000,0x0f); //  
        outw(0x00ff,ioremap_addr); // open led ary, all led on
    #ifdef OURS_LED_DEBUG
            printk("remap address = %x  [ --kernel--]\n",ioremap_addr);
    #endif
 
showversion();  
return 0;
 
fail_malloc:unregister_chrdev_region(dev,1);
return result;
}
void led_cleanup(void)
{
     static long *addr_status;
 
     outw(0x0000,ioremap_addr);
     
     addr_status=ioremap(0x08000018,0x0f);
 
          outb(0x00,addr_status);  //select cpld2         
 
 cdev_del(&led_devp->cdev);
  kfree(led_devp);
  unregister_chrdev_region(MKDEV(led_major,0),1);
  printk("led_cleanup\n");
}
 
MODULE_DESCRIPTION("simple led driver module");
MODULE_AUTHOR("guliangzeng");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_ALIAS("led module");
 
module_init(led_init);
module_exit(led_cleanup);

//***********************马铁旦和刘星亮作品******************************
#include
#include
#include

#include       // open() close()
#include      // read() write()


#define DEVICE_NAME "/dev/led_ary_ctl"


//------------------------------------- main ----------------------------------------------------------------
int main(void)
{
    int fd;
    int ret;
    unsigned char buf[2] ;
    unsigned char c,r;
    int i,j;
   
    // begin of led ary
    c = 1;
    r = 1;

        printf("\nstart led_driver test\n\n");

        fd = open(DEVICE_NAME, O_RDWR);
   
    printf("fd = %d\n",fd);
   
        if (fd == -1) {
        printf("open device %s error\n",DEVICE_NAME);
        }
        else {
    while(1){
        c = 1;
        r = 1;
/*        for (i=1;i<=8;i++) {
            buf[0]=c;
            buf[1]=~r; // row
            for (j=1;j<=8;j++) {
                write(fd,buf,2);
                printf ("buf[0],buf[1]: [%x,%x]\n",buf[0],buf[1]);
                //usleep(200000); // sleep 0.2 second
                c = c<<1;
                buf[0]=c; // column
                }
            c = 1;
              r = r<<1;
          }
*/        // close
//***************************************************************************************
        for(i=1;i<6;i=i+2){
        c = c<<1;
        buf[0]=c;
        r = r<<1;
        buf[1]=~r;
            for(j=1;j<7;j++){
            write(fd,buf,2);
                //printf ("buf[0],buf[1]: [%x,%x]\n",buf[0],buf[1]);
                //usleep(200000); // sleep 0.2 second
                c = c<<1;
                buf[0]=c;
            }
            c = 1;
              r = r<<1;
}               
//*************************************************************************************
    c = 1;
    r = 1;
    for(i=2;i<5;i=i+2){
        c = c<<1;
        buf[0]=c;
        r = r<<2;
        buf[1]=~r;
        for(j=1;j<7;j=j+5){
            write(fd,buf,2);
            //printf ("buf[0],buf[1]: [%x,%x]\n",buf[0],buf[1]);
                //usleep(200000); // sleep 0.2 second
                c = c<<5;
                buf[0]=c;
        }
       
                c = 1;   
        }
//**************************************************************************************       
        c = 1;
        r = 1;
            r = r<<7;
            buf[0]=c;
            buf[1]=~r; // row
            for (j=1;j<=8;j++) {
                write(fd,buf,2);
                //printf ("buf[0],buf[1]: [%x,%x]\n",buf[0],buf[1]);
                //usleep(200000); // sleep 0.2 second
                c = c<<1;
                buf[0]=c; // column
                }
        }
//**************************************************************************************
        ret = close(fd);
        //printf ("ret=%d\n",ret);
        //printf ("close led_driver test\n");
    }

        return 0;
}// end main
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