include/linux/watchdog.h

1 /* SPDX-License-Identifier: GPL-2.0 */
25 /** struct watchdog_ops - The watchdog-devices operations
32  * @set_timeout:The routine for setting the watchdog devices timeout value (in seconds).
34  * @get_timeleft:The routine that gets the time left before a reset (in seconds).
38  * The watchdog_ops structure contains a list of low-level operations
58 /** struct watchdog_device - The structure that defines a watchdog device
68  * @timeout:	The watchdog devices timeout value (in seconds).
70  * @min_timeout:The watchdog devices minimum timeout value (in seconds).
71  * @max_timeout:The watchdog devices maximum timeout value (in seconds)
76  *		in milli-seconds.
78  *		Hardware limit for maximum timeout, in milli-seconds.
91  * The driver-data field may not be accessed directly. It must be accessed
130 	return test_bit(WDOG_ACTIVE, &wdd->status);  in watchdog_active()
139 	return test_bit(WDOG_HW_RUNNING, &wdd->status);  in watchdog_hw_running()
146 		set_bit(WDOG_NO_WAY_OUT, &wdd->status);  in watchdog_set_nowayout()
152 	set_bit(WDOG_STOP_ON_REBOOT, &wdd->status);  in watchdog_stop_on_reboot()
158 	set_bit(WDOG_STOP_ON_UNREGISTER, &wdd->status);  in watchdog_stop_on_unregister()
164 	set_bit(WDOG_NO_PING_ON_SUSPEND, &wdd->status);  in watchdog_stop_ping_on_suspend()
172 	 * - the requested value is larger than UINT_MAX / 1000  in watchdog_timeout_invalid()
173 	 *   (since internal calculations are done in milli-seconds),  in watchdog_timeout_invalid()
175 	 * - the requested value is smaller than the configured minimum timeout,  in watchdog_timeout_invalid()
177 	 * - a maximum hardware timeout is not configured, a maximum timeout  in watchdog_timeout_invalid()
181 	return t > UINT_MAX / 1000 || t < wdd->min_timeout ||  in watchdog_timeout_invalid()
182 		(!wdd->max_hw_heartbeat_ms && wdd->max_timeout &&  in watchdog_timeout_invalid()
183 		 t > wdd->max_timeout);  in watchdog_timeout_invalid()
190 	return t && wdd->timeout && t >= wdd->timeout;  in watchdog_pretimeout_invalid()
196 	wdd->driver_data = data;  in watchdog_set_drvdata()
201 	return wdd->driver_data;  in watchdog_get_drvdata()
210 	pr_alert("watchdog%d: pretimeout event\n", wdd->id);  in watchdog_notify_pretimeout()