请教DM8168的看门狗驱动omap_wdt.c问题

你可以参考：\linux_lsp\example\watchdog\saWatchdog.c文件以及http://processors.wiki.ti.com/index.php/TI81XX_PSP_WDT_Driver_User_Guide

下面是一个例子：

 int fd;

void catch_int(int signum)
{
 signal(SIGINT, catch_int);

 printf("In signal handler\n");
 if(0 != close(fd))
  printf("Close failed in signal handler\n");
 else
  printf("Close succeeded in signal handler\n");
}

int main(int argc, const char *argv[]) {
       
 int sleep_time = atoi(argv[1]); 

 int data = 0;
        int ret_val;

 signal(SIGINT, catch_int);

        fd=open("/dev/watchdog",O_WRONLY);
        if (fd==-1) {
                perror("watchdog");
                return 1;
        }

        ret_val = ioctl (fd, WDIOC_GETTIMEOUT, &data);
        if (ret_val) {
         printf ("\nWatchdog Timer : WDIOC_GETTIMEOUT failed");
        }
        else {
         printf ("\nCurrent timeout value is : %d seconds\n", data);
        }

 data = 10;

        ret_val = ioctl (fd, WDIOC_SETTIMEOUT, &data);
        if (ret_val) {
         printf ("\nWatchdog Timer : WDIOC_SETTIMEOUT failed");
        }
        else {
         printf ("\nNew timeout value is : %d seconds", data);
        }

        ret_val = ioctl (fd, WDIOC_GETTIMEOUT, &data);
        if (ret_val) {
         printf ("\nWatchdog Timer : WDIOC_GETTIMEOUT failed");
        }
        else {
         printf ("\nCurrent timeout value is : %d seconds\n", data);
        }

        while(1)
        {
                if (1 != write(fd, "\0", 1))
  {
   printf("Write failed\n");
   break;
  }
  else
   printf("Write succeeded\n");

                sleep(sleep_time);
        }

        if (0 != close (fd))
  printf("Close failed\n");
 else
  printf("Close succeeded\n");
 
 return 0;
}