static int riowd_ioctl(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
{
static struct watchdog_info info = {
WDIOF_SETTIMEOUT, 0, "Natl. Semiconductor PC97317"
};
void __user *argp = (void __user *)arg;
unsigned int options;
int new_margin;
switch (cmd) {
case WDIOC_GETSUPPORT:
if (copy_to_user(argp, &info, sizeof(info)))
return -EFAULT;
break;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
if (put_user(0, (int __user *)argp))
return -EFAULT;
break;
case WDIOC_KEEPALIVE:
riowd_pingtimer();
break;
case WDIOC_SETOPTIONS:
if (copy_from_user(&options, argp, sizeof(options)))
return -EFAULT;
if (options & WDIOS_DISABLECARD)
riowd_stoptimer();
else if (options & WDIOS_ENABLECARD)
riowd_starttimer();
else
return -EINVAL;
break;
case WDIOC_SETTIMEOUT:
if (get_user(new_margin, (int __user *)argp))
return -EFAULT;
if ((new_margin < 60) || (new_margin > (255 * 60)))
return -EINVAL;
riowd_timeout = (new_margin + 59) / 60;
riowd_pingtimer();
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(riowd_timeout * 60, (int __user *)argp);
default:
return -EINVAL;
};
return 0;
}
static ssize_t riowd_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
if (count) {
riowd_pingtimer();
return 1;
}
return 0;
}
static ssize_t riowd_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
{
if (ppos != &file->f_pos)
return -ESPIPE;
if (count) {
riowd_pingtimer();
return 1;
}
return 0;
}
