/**
* sh_wdt_ioctl - Query Device
*
* @inode: inode of device
* @file: file handle of device
* @cmd: watchdog command
* @arg: argument
*
* Query basic information from the device or ping it, as outlined by the
* watchdog API.
*/
static int sh_wdt_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
int new_heartbeat;
int options, retval = -EINVAL;
switch (cmd) {
case WDIOC_GETSUPPORT:
return copy_to_user((struct watchdog_info *)arg,
&sh_wdt_info,
sizeof(sh_wdt_info)) ? -EFAULT : 0;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(0, (int *)arg);
case WDIOC_KEEPALIVE:
sh_wdt_keepalive();
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_heartbeat, (int *)arg))
return -EFAULT;
if (sh_wdt_set_heartbeat(new_heartbeat))
return -EINVAL;
sh_wdt_keepalive();
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(heartbeat, (int *)arg);
case WDIOC_SETOPTIONS:
if (get_user(options, (int *)arg))
return -EFAULT;
if (options & WDIOS_DISABLECARD) {
sh_wdt_stop();
retval = 0;
}
if (options & WDIOS_ENABLECARD) {
sh_wdt_start();
retval = 0;
}
return retval;
default:
return -ENOIOCTLCMD;
}
return 0;
}
static int __devinit sh_wdt_probe(struct platform_device *pdev)
{
struct sh_wdt *wdt;
struct resource *res;
int rc;
/*
* As this driver only covers the global watchdog case, reject
* any attempts to register per-CPU watchdogs.
*/
if (pdev->id != -1)
return -EINVAL;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (unlikely(!res))
return -EINVAL;
wdt = devm_kzalloc(&pdev->dev, sizeof(struct sh_wdt), GFP_KERNEL);
if (unlikely(!wdt))
return -ENOMEM;
wdt->dev = &pdev->dev;
wdt->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(wdt->clk)) {
/*
* Clock framework support is optional, continue on
* anyways if we don't find a matching clock.
*/
wdt->clk = NULL;
}
wdt->base = devm_request_and_ioremap(wdt->dev, res);
if (unlikely(!wdt->base)) {
rc = -EADDRNOTAVAIL;
goto err;
}
watchdog_set_nowayout(&sh_wdt_dev, nowayout);
watchdog_set_drvdata(&sh_wdt_dev, wdt);
spin_lock_init(&wdt->lock);
rc = sh_wdt_set_heartbeat(&sh_wdt_dev, heartbeat);
if (unlikely(rc)) {
/* Default timeout if invalid */
sh_wdt_set_heartbeat(&sh_wdt_dev, WATCHDOG_HEARTBEAT);
dev_warn(&pdev->dev,
"heartbeat value must be 1<=x<=3600, using %d\n",
sh_wdt_dev.timeout);
}
dev_info(&pdev->dev, "configured with heartbeat=%d sec (nowayout=%d)\n",
sh_wdt_dev.timeout, nowayout);
rc = watchdog_register_device(&sh_wdt_dev);
if (unlikely(rc)) {
dev_err(&pdev->dev, "Can't register watchdog (err=%d)\n", rc);
goto err;
}
init_timer(&wdt->timer);
wdt->timer.function = sh_wdt_ping;
wdt->timer.data = (unsigned long)wdt;
wdt->timer.expires = next_ping_period(clock_division_ratio);
platform_set_drvdata(pdev, wdt);
dev_info(&pdev->dev, "initialized.\n");
pm_runtime_enable(&pdev->dev);
return 0;
err:
clk_put(wdt->clk);
return rc;
}
