161  * @wdt: mei watchdog device
166 static int mei_wdt_ping(struct mei_wdt *wdt)  in mei_wdt_ping()  argument
177 	req.timeout = wdt->timeout;  in mei_wdt_ping()
179 	ret = mei_cldev_send(wdt->cldev, (u8 *)&req, req_len);  in mei_wdt_ping()
189  * @wdt: mei watchdog device
194 static int mei_wdt_stop(struct mei_wdt *wdt)  in mei_wdt_stop()  argument
206 	ret = mei_cldev_send(wdt->cldev, (u8 *)&req, req_len);  in mei_wdt_stop()
222 	struct mei_wdt *wdt = watchdog_get_drvdata(wdd);  in mei_wdt_ops_start()  local
224 	wdt->state = MEI_WDT_START;  in mei_wdt_ops_start()
225 	wdd->timeout = wdt->timeout;  in mei_wdt_ops_start()
238 	struct mei_wdt *wdt = watchdog_get_drvdata(wdd);  in mei_wdt_ops_stop()  local
241 	if (wdt->state != MEI_WDT_RUNNING)  in mei_wdt_ops_stop()
244 	wdt->state = MEI_WDT_STOPPING;  in mei_wdt_ops_stop()
246 	ret = mei_wdt_stop(wdt);  in mei_wdt_ops_stop()
250 	wdt->state = MEI_WDT_IDLE;  in mei_wdt_ops_stop()
264 	struct mei_wdt *wdt = watchdog_get_drvdata(wdd);  in mei_wdt_ops_ping()  local
267 	if (wdt->state != MEI_WDT_START && wdt->state != MEI_WDT_RUNNING)  in mei_wdt_ops_ping()
270 	if (wdt->resp_required)  in mei_wdt_ops_ping()
271 		init_completion(&wdt->response);  in mei_wdt_ops_ping()
273 	wdt->state = MEI_WDT_RUNNING;  in mei_wdt_ops_ping()
274 	ret = mei_wdt_ping(wdt);  in mei_wdt_ops_ping()
278 	if (wdt->resp_required)  in mei_wdt_ops_ping()
279 		ret = wait_for_completion_killable(&wdt->response);  in mei_wdt_ops_ping()
296 	struct mei_wdt *wdt = watchdog_get_drvdata(wdd);  in mei_wdt_ops_set_timeout()  local
299 	wdt->timeout = timeout;  in mei_wdt_ops_set_timeout()
322  * __mei_wdt_is_registered - check if wdt is registered
324  * @wdt: mei watchdog device
326  * Return: true if the wdt is registered with the watchdog subsystem
327  * Locking: should be called under wdt->reg_lock
329 static inline bool __mei_wdt_is_registered(struct mei_wdt *wdt)  in __mei_wdt_is_registered()  argument
331 	return !!watchdog_get_drvdata(&wdt->wdd);  in __mei_wdt_is_registered()
337  * @wdt: mei watchdog device
339 static void mei_wdt_unregister(struct mei_wdt *wdt)  in mei_wdt_unregister()  argument
341 	mutex_lock(&wdt->reg_lock);  in mei_wdt_unregister()
343 	if (__mei_wdt_is_registered(wdt)) {  in mei_wdt_unregister()
344 		watchdog_unregister_device(&wdt->wdd);  in mei_wdt_unregister()
345 		watchdog_set_drvdata(&wdt->wdd, NULL);  in mei_wdt_unregister()
346 		memset(&wdt->wdd, 0, sizeof(wdt->wdd));  in mei_wdt_unregister()
349 	mutex_unlock(&wdt->reg_lock);  in mei_wdt_unregister()
355  * @wdt: mei watchdog device
359 static int mei_wdt_register(struct mei_wdt *wdt)  in mei_wdt_register()  argument
364 	if (!wdt || !wdt->cldev)  in mei_wdt_register()
367 	dev = &wdt->cldev->dev;  in mei_wdt_register()
369 	mutex_lock(&wdt->reg_lock);  in mei_wdt_register()
371 	if (__mei_wdt_is_registered(wdt)) {  in mei_wdt_register()
376 	wdt->wdd.info = &wd_info;  in mei_wdt_register()
377 	wdt->wdd.ops = &wd_ops;  in mei_wdt_register()
378 	wdt->wdd.parent = dev;  in mei_wdt_register()
379 	wdt->wdd.timeout = MEI_WDT_DEFAULT_TIMEOUT;  in mei_wdt_register()
380 	wdt->wdd.min_timeout = MEI_WDT_MIN_TIMEOUT;  in mei_wdt_register()
381 	wdt->wdd.max_timeout = MEI_WDT_MAX_TIMEOUT;  in mei_wdt_register()
383 	watchdog_set_drvdata(&wdt->wdd, wdt);  in mei_wdt_register()
384 	watchdog_stop_on_reboot(&wdt->wdd);  in mei_wdt_register()
386 	ret = watchdog_register_device(&wdt->wdd);  in mei_wdt_register()
388 		watchdog_set_drvdata(&wdt->wdd, NULL);  in mei_wdt_register()
390 	wdt->state = MEI_WDT_IDLE;  in mei_wdt_register()
393 	mutex_unlock(&wdt->reg_lock);  in mei_wdt_register()
399 	struct mei_wdt *wdt = container_of(work, struct mei_wdt, unregister);  in mei_wdt_unregister_work()  local
401 	mei_wdt_unregister(wdt);  in mei_wdt_unregister_work()
411 	struct mei_wdt *wdt = mei_cldev_get_drvdata(cldev);  in mei_wdt_rx()  local
416 	ret = mei_cldev_recv(wdt->cldev, (u8 *)&res, res_len);  in mei_wdt_rx()
440 			 mei_wdt_state_str(wdt->state),  in mei_wdt_rx()
441 			 wdt->state);  in mei_wdt_rx()
449 	if (wdt->state == MEI_WDT_RUNNING) {  in mei_wdt_rx()
451 			wdt->state = MEI_WDT_NOT_REQUIRED;  in mei_wdt_rx()
452 			schedule_work(&wdt->unregister);  in mei_wdt_rx()
457 	if (wdt->state == MEI_WDT_PROBE) {  in mei_wdt_rx()
459 			wdt->state = MEI_WDT_NOT_REQUIRED;  in mei_wdt_rx()
462 			mei_wdt_stop(wdt);  in mei_wdt_rx()
463 			mei_wdt_register(wdt);  in mei_wdt_rx()
469 			 mei_wdt_state_str(wdt->state), wdt->state);  in mei_wdt_rx()
472 	if (!completion_done(&wdt->response))  in mei_wdt_rx()
473 		complete(&wdt->response);  in mei_wdt_rx()
483 	struct mei_wdt *wdt = mei_cldev_get_drvdata(cldev);  in mei_wdt_notif()  local
485 	if (wdt->state != MEI_WDT_NOT_REQUIRED)  in mei_wdt_notif()
488 	mei_wdt_register(wdt);  in mei_wdt_notif()
496 	struct mei_wdt *wdt = file->private_data;  in mei_dbgfs_read_activation()  local
501 	mutex_lock(&wdt->reg_lock);  in mei_dbgfs_read_activation()
503 		__mei_wdt_is_registered(wdt) ? "activated" : "deactivated");  in mei_dbgfs_read_activation()
504 	mutex_unlock(&wdt->reg_lock);  in mei_dbgfs_read_activation()
518 	struct mei_wdt *wdt = file->private_data;  in mei_dbgfs_read_state()  local
523 			mei_wdt_state_str(wdt->state));  in mei_dbgfs_read_state()
534 static void dbgfs_unregister(struct mei_wdt *wdt)  in dbgfs_unregister()  argument
536 	debugfs_remove_recursive(wdt->dbgfs_dir);  in dbgfs_unregister()
537 	wdt->dbgfs_dir = NULL;  in dbgfs_unregister()
540 static void dbgfs_register(struct mei_wdt *wdt)  in dbgfs_register()  argument
545 	wdt->dbgfs_dir = dir;  in dbgfs_register()
547 	debugfs_create_file("state", S_IRUSR, dir, wdt, &dbgfs_fops_state);  in dbgfs_register()
549 	debugfs_create_file("activation", S_IRUSR, dir, wdt,  in dbgfs_register()
555 static inline void dbgfs_unregister(struct mei_wdt *wdt) {}  in dbgfs_unregister()  argument
556 static inline void dbgfs_register(struct mei_wdt *wdt) {}  in dbgfs_register()  argument
562 	struct mei_wdt *wdt;  in mei_wdt_probe()  local
565 	wdt = kzalloc(sizeof(struct mei_wdt), GFP_KERNEL);  in mei_wdt_probe()
566 	if (!wdt)  in mei_wdt_probe()
569 	wdt->timeout = MEI_WDT_DEFAULT_TIMEOUT;  in mei_wdt_probe()
570 	wdt->state = MEI_WDT_PROBE;  in mei_wdt_probe()
571 	wdt->cldev = cldev;  in mei_wdt_probe()
572 	wdt->resp_required = mei_cldev_ver(cldev) > 0x1;  in mei_wdt_probe()
573 	mutex_init(&wdt->reg_lock);  in mei_wdt_probe()
574 	init_completion(&wdt->response);  in mei_wdt_probe()
575 	INIT_WORK(&wdt->unregister, mei_wdt_unregister_work);  in mei_wdt_probe()
577 	mei_cldev_set_drvdata(cldev, wdt);  in mei_wdt_probe()
585 	ret = mei_cldev_register_rx_cb(wdt->cldev, mei_wdt_rx);  in mei_wdt_probe()
591 	ret = mei_cldev_register_notif_cb(wdt->cldev, mei_wdt_notif);  in mei_wdt_probe()
601 	if (wdt->resp_required)  in mei_wdt_probe()
602 		ret = mei_wdt_ping(wdt);  in mei_wdt_probe()
604 		ret = mei_wdt_register(wdt);  in mei_wdt_probe()
609 	dbgfs_register(wdt);  in mei_wdt_probe()
617 	kfree(wdt);  in mei_wdt_probe()
624 	struct mei_wdt *wdt = mei_cldev_get_drvdata(cldev);  in mei_wdt_remove()  local
627 	if (!completion_done(&wdt->response))  in mei_wdt_remove()
628 		complete(&wdt->response);  in mei_wdt_remove()
630 	cancel_work_sync(&wdt->unregister);  in mei_wdt_remove()
632 	mei_wdt_unregister(wdt);  in mei_wdt_remove()
636 	dbgfs_unregister(wdt);  in mei_wdt_remove()
638 	kfree(wdt);  in mei_wdt_remove()