62 static int watchdog_ping(struct watchdog_device *wdd)  in watchdog_ping()  argument
66 	mutex_lock(&wdd->lock);  in watchdog_ping()
68 	if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {  in watchdog_ping()
73 	if (!watchdog_active(wdd))  in watchdog_ping()
76 	if (wdd->ops->ping)  in watchdog_ping()
77 		err = wdd->ops->ping(wdd);	/* ping the watchdog */  in watchdog_ping()
79 		err = wdd->ops->start(wdd);	/* restart watchdog */  in watchdog_ping()
82 	mutex_unlock(&wdd->lock);  in watchdog_ping()
95 static int watchdog_start(struct watchdog_device *wdd)  in watchdog_start()  argument
99 	mutex_lock(&wdd->lock);  in watchdog_start()
101 	if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {  in watchdog_start()
106 	if (watchdog_active(wdd))  in watchdog_start()
109 	err = wdd->ops->start(wdd);  in watchdog_start()
111 		set_bit(WDOG_ACTIVE, &wdd->status);  in watchdog_start()
114 	mutex_unlock(&wdd->lock);  in watchdog_start()
128 static int watchdog_stop(struct watchdog_device *wdd)  in watchdog_stop()  argument
132 	mutex_lock(&wdd->lock);  in watchdog_stop()
134 	if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {  in watchdog_stop()
139 	if (!watchdog_active(wdd))  in watchdog_stop()
142 	if (test_bit(WDOG_NO_WAY_OUT, &wdd->status)) {  in watchdog_stop()
143 		dev_info(wdd->dev, "nowayout prevents watchdog being stopped!\n");  in watchdog_stop()
148 	err = wdd->ops->stop(wdd);  in watchdog_stop()
150 		clear_bit(WDOG_ACTIVE, &wdd->status);  in watchdog_stop()
153 	mutex_unlock(&wdd->lock);  in watchdog_stop()
165 static int watchdog_get_status(struct watchdog_device *wdd,  in watchdog_get_status()  argument
171 	if (!wdd->ops->status)  in watchdog_get_status()
174 	mutex_lock(&wdd->lock);  in watchdog_get_status()
176 	if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {  in watchdog_get_status()
181 	*status = wdd->ops->status(wdd);  in watchdog_get_status()
184 	mutex_unlock(&wdd->lock);  in watchdog_get_status()
194 static int watchdog_set_timeout(struct watchdog_device *wdd,  in watchdog_set_timeout()  argument
199 	if (!wdd->ops->set_timeout || !(wdd->info->options & WDIOF_SETTIMEOUT))  in watchdog_set_timeout()
202 	if (watchdog_timeout_invalid(wdd, timeout))  in watchdog_set_timeout()
205 	mutex_lock(&wdd->lock);  in watchdog_set_timeout()
207 	if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {  in watchdog_set_timeout()
212 	err = wdd->ops->set_timeout(wdd, timeout);  in watchdog_set_timeout()
215 	mutex_unlock(&wdd->lock);  in watchdog_set_timeout()
227 static int watchdog_get_timeleft(struct watchdog_device *wdd,  in watchdog_get_timeleft()  argument
233 	if (!wdd->ops->get_timeleft)  in watchdog_get_timeleft()
236 	mutex_lock(&wdd->lock);  in watchdog_get_timeleft()
238 	if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {  in watchdog_get_timeleft()
243 	*timeleft = wdd->ops->get_timeleft(wdd);  in watchdog_get_timeleft()
246 	mutex_unlock(&wdd->lock);  in watchdog_get_timeleft()
257 static int watchdog_ioctl_op(struct watchdog_device *wdd, unsigned int cmd,  in watchdog_ioctl_op()  argument
262 	if (!wdd->ops->ioctl)  in watchdog_ioctl_op()
265 	mutex_lock(&wdd->lock);  in watchdog_ioctl_op()
267 	if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {  in watchdog_ioctl_op()
272 	err = wdd->ops->ioctl(wdd, cmd, arg);  in watchdog_ioctl_op()
275 	mutex_unlock(&wdd->lock);  in watchdog_ioctl_op()
294 	struct watchdog_device *wdd = file->private_data;  in watchdog_write()  local
306 	clear_bit(WDOG_ALLOW_RELEASE, &wdd->status);  in watchdog_write()
313 			set_bit(WDOG_ALLOW_RELEASE, &wdd->status);  in watchdog_write()
317 	err = watchdog_ping(wdd);  in watchdog_write()
337 	struct watchdog_device *wdd = file->private_data;  in watchdog_ioctl()  local
343 	err = watchdog_ioctl_op(wdd, cmd, arg);  in watchdog_ioctl()
349 		return copy_to_user(argp, wdd->info,  in watchdog_ioctl()
352 		err = watchdog_get_status(wdd, &val);  in watchdog_ioctl()
357 		return put_user(wdd->bootstatus, p);  in watchdog_ioctl()
362 			err = watchdog_stop(wdd);  in watchdog_ioctl()
367 			err = watchdog_start(wdd);  in watchdog_ioctl()
373 		if (!(wdd->info->options & WDIOF_KEEPALIVEPING))  in watchdog_ioctl()
375 		return watchdog_ping(wdd);  in watchdog_ioctl()
379 		err = watchdog_set_timeout(wdd, val);  in watchdog_ioctl()
385 		err = watchdog_ping(wdd);  in watchdog_ioctl()
391 		if (wdd->timeout == 0)  in watchdog_ioctl()
393 		return put_user(wdd->timeout, p);  in watchdog_ioctl()
395 		err = watchdog_get_timeleft(wdd, &val);  in watchdog_ioctl()
417 	struct watchdog_device *wdd;  in watchdog_open()  local
421 		wdd = old_wdd;  in watchdog_open()
423 		wdd = container_of(inode->i_cdev, struct watchdog_device, cdev);  in watchdog_open()
426 	if (test_and_set_bit(WDOG_DEV_OPEN, &wdd->status))  in watchdog_open()
433 	if (!try_module_get(wdd->ops->owner))  in watchdog_open()
436 	err = watchdog_start(wdd);  in watchdog_open()
440 	file->private_data = wdd;  in watchdog_open()
442 	if (wdd->ops->ref)  in watchdog_open()
443 		wdd->ops->ref(wdd);  in watchdog_open()
449 	module_put(wdd->ops->owner);  in watchdog_open()
451 	clear_bit(WDOG_DEV_OPEN, &wdd->status);  in watchdog_open()
467 	struct watchdog_device *wdd = file->private_data;  in watchdog_release()  local
475 	if (!test_bit(WDOG_ACTIVE, &wdd->status))  in watchdog_release()
477 	else if (test_and_clear_bit(WDOG_ALLOW_RELEASE, &wdd->status) ||  in watchdog_release()
478 		 !(wdd->info->options & WDIOF_MAGICCLOSE))  in watchdog_release()
479 		err = watchdog_stop(wdd);  in watchdog_release()
483 		mutex_lock(&wdd->lock);  in watchdog_release()
484 		if (!test_bit(WDOG_UNREGISTERED, &wdd->status))  in watchdog_release()
485 			dev_crit(wdd->dev, "watchdog did not stop!\n");  in watchdog_release()
486 		mutex_unlock(&wdd->lock);  in watchdog_release()
487 		watchdog_ping(wdd);  in watchdog_release()
491 	module_put(wdd->ops->owner);  in watchdog_release()
494 	clear_bit(WDOG_DEV_OPEN, &wdd->status);  in watchdog_release()
497 	if (wdd->ops->unref)  in watchdog_release()
498 		wdd->ops->unref(wdd);  in watchdog_release()
526 int watchdog_dev_register(struct watchdog_device *wdd)  in watchdog_dev_register()  argument
530 	if (wdd->id == 0) {  in watchdog_dev_register()
531 		old_wdd = wdd;  in watchdog_dev_register()
532 		watchdog_miscdev.parent = wdd->parent;  in watchdog_dev_register()
536 				wdd->info->identity, WATCHDOG_MINOR, err);  in watchdog_dev_register()
539 					wdd->info->identity);  in watchdog_dev_register()
546 	devno = MKDEV(MAJOR(watchdog_devt), wdd->id);  in watchdog_dev_register()
547 	cdev_init(&wdd->cdev, &watchdog_fops);  in watchdog_dev_register()
548 	wdd->cdev.owner = wdd->ops->owner;  in watchdog_dev_register()
551 	err  = cdev_add(&wdd->cdev, devno, 1);  in watchdog_dev_register()
554 			wdd->id,  MAJOR(watchdog_devt), wdd->id);  in watchdog_dev_register()
555 		if (wdd->id == 0) {  in watchdog_dev_register()
570 int watchdog_dev_unregister(struct watchdog_device *wdd)  in watchdog_dev_unregister()  argument
572 	mutex_lock(&wdd->lock);  in watchdog_dev_unregister()
573 	set_bit(WDOG_UNREGISTERED, &wdd->status);  in watchdog_dev_unregister()
574 	mutex_unlock(&wdd->lock);  in watchdog_dev_unregister()
576 	cdev_del(&wdd->cdev);  in watchdog_dev_unregister()
577 	if (wdd->id == 0) {  in watchdog_dev_unregister()