static int bcm63xx_wdt_open(struct inode *inode, struct file *file)
{
if (test_and_set_bit(0, &bcm63xx_wdt_device.inuse))
return -EBUSY;
bcm63xx_wdt_start();
return nonseekable_open(inode, file);
}
static int bcm63xx_wdt_release(struct inode *inode, struct file *file)
{
if (expect_close == 42)
bcm63xx_wdt_pause();
else {
pr_crit("Unexpected close, not stopping watchdog!\n");
bcm63xx_wdt_start();
}
clear_bit(0, &bcm63xx_wdt_device.inuse);
expect_close = 0;
return 0;
}
static long bcm63xx_wdt_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
int new_value, retval = -EINVAL;
switch (cmd) {
case WDIOC_GETSUPPORT:
return copy_to_user(argp, &bcm63xx_wdt_info,
sizeof(bcm63xx_wdt_info)) ? -EFAULT : 0;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(0, p);
case WDIOC_SETOPTIONS:
if (get_user(new_value, p))
return -EFAULT;
if (new_value & WDIOS_DISABLECARD) {
bcm63xx_wdt_pause();
retval = 0;
}
if (new_value & WDIOS_ENABLECARD) {
bcm63xx_wdt_start();
retval = 0;
}
return retval;
case WDIOC_KEEPALIVE:
bcm63xx_wdt_pet();
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_value, p))
return -EFAULT;
if (bcm63xx_wdt_settimeout(new_value))
return -EINVAL;
bcm63xx_wdt_pet();
case WDIOC_GETTIMEOUT:
return put_user(wdt_time, p);
default:
return -ENOTTY;
}
}
static long bcm63xx_wdt_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
int new_timeout;
unsigned int value;
static struct watchdog_info ident = {
.options = WDIOF_SETTIMEOUT |
WDIOF_KEEPALIVEPING |
WDIOF_MAGICCLOSE,
.identity = "BCM63xx Watchdog",
};
switch (cmd) {
case WDIOC_KEEPALIVE:
bcm63xx_wdt_reset();
break;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
value = bcm_readl(bcm63xx_wdt_device.regs + WDT_DEFVAL_REG);
if (copy_to_user(argp, &value, sizeof(int)))
return -EFAULT;
break;
case WDIOC_GETSUPPORT:
if (copy_to_user(argp, &ident, sizeof(ident)))
return -EFAULT;
break;
case WDIOC_SETOPTIONS:
if (copy_from_user(&value, argp, sizeof(int)))
return -EFAULT;
switch (value) {
case WDIOS_ENABLECARD:
bcm63xx_wdt_start();
break;
case WDIOS_DISABLECARD:
bcm63xx_wdt_stop();
default:
return -EINVAL;
}
break;
case WDIOC_SETTIMEOUT:
if (copy_from_user(&new_timeout, argp, sizeof(int)))
return -EFAULT;
if (new_timeout < 5)
return -EINVAL;
if (new_timeout > 40)
return -EINVAL;
bcm63xx_wdt_set(new_timeout);
bcm63xx_wdt_toggle();
case WDIOC_GETTIMEOUT:
return copy_to_user(argp, &timeout, sizeof(int));
default:
return -ENOTTY;
}
return 0;
}
static struct file_operations bcm63xx_wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = bcm63xx_wdt_write,
.unlocked_ioctl = bcm63xx_wdt_ioctl,
.open = bcm63xx_wdt_open,
.release = bcm63xx_wdt_release,
};
static struct miscdevice bcm63xx_wdt_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &bcm63xx_wdt_fops,
};
static int bcm63xx_wdt_probe(struct platform_device *pdev)
{
int ret;
struct resource *r;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r) {
printk(KERN_ERR PFX
"failed to retrieve resources\n");
return -ENODEV;
}
bcm63xx_wdt_device.regs = ioremap_nocache(r->start, r->end - r->start);
if (!bcm63xx_wdt_device.regs) {
printk(KERN_ERR PFX
"failed to remap I/O resources\n");
return -ENXIO;
}
ret = misc_register(&bcm63xx_wdt_miscdev);
if (ret < 0) {
printk(KERN_ERR PFX
"failed to register watchdog device\n");
goto unmap;
}
init_completion(&bcm63xx_wdt_device.stop);
bcm63xx_wdt_device.queue = 0;
clear_bit(0, &bcm63xx_wdt_device.inuse);
setup_timer(&bcm63xx_wdt_device.timer, bcm63xx_wdt_update, 0L);
bcm63xx_wdt_device.default_ticks = ticks;
bcm63xx_wdt_set(ticks);
bcm63xx_wdt_start();
printk(KERN_INFO PFX " started, timer margin: %d sec\n", WDT_INTERVAL);
return 0;
unmap:
iounmap(bcm63xx_wdt_device.regs);
return ret;
}
static int bcm63xx_wdt_remove(struct platform_device *pdev)
{
if (bcm63xx_wdt_device.queue) {
bcm63xx_wdt_device.queue = 0;
wait_for_completion(&bcm63xx_wdt_device.stop);
}
misc_deregister(&bcm63xx_wdt_miscdev);
iounmap(bcm63xx_wdt_device.regs);
return 0;
}
static struct platform_driver bcm63xx_wdt = {
.probe = bcm63xx_wdt_probe,
.remove = bcm63xx_wdt_remove,
.driver = {
.name = "bcm63xx-wdt",
}
};
static int __init bcm63xx_wdt_init(void)
{
return platform_driver_register(&bcm63xx_wdt);
}
static void __exit bcm63xx_wdt_exit(void)
{
platform_driver_unregister(&bcm63xx_wdt);
}
