3  *	SMsC 37B787 Watchdog Timer driver for Linux 2.6.x.x
21  *	A Watchdog Timer (WDT) is a hardware circuit that can
26  *	via the /dev/watchdog special device file that userspace is
28  *	occurs, the driver will usually tell the hardware watchdog
29  *	that everything is in order, and that the watchdog should wait
32  *	notifications cease to occur, and the hardware watchdog will
36  *  mknod /dev/watchdog c 10 130
39  *   Documentation/watchdog/wdt.rst
48 #include <linux/watchdog.h>
82 static DEFINE_SPINLOCK(io_lock);/* to guard the watchdog from io races */
155 	/* -- Watchdog timer units --  in wdt_timer_units()
165 	/* -- Watchdog Timer Time-out Value --  in wdt_timeout_value()
173 	/* -- Watchdog timer configuration --  in wdt_timer_conf()
189 	/* -- Watchdog timer control --  in wdt_timer_ctrl()
211 /* initialize watchdog */
221 	/* enable the watchdog */  in wb_smsc_wdt_initialize()
239 	/* set the watchdog timer units */  in wb_smsc_wdt_initialize()
246 /* shutdown the watchdog */
254 	/* disable the watchdog */  in wb_smsc_wdt_shutdown()
258 	/* reset watchdog config register */  in wb_smsc_wdt_shutdown()
261 	/* reset watchdog control register */  in wb_smsc_wdt_shutdown()
271 /* set timeout => enable watchdog */
305 /* disable watchdog */
309 	/* set the timeout to 0 to disable the watchdog */  in wb_smsc_wdt_disable()
313 /* enable watchdog by setting the current timeout */
337 /* return, if the watchdog is enabled (timeout is set...) */
347 /* open => enable watchdog and set initial timeout */
351 	/* /dev/watchdog can only be opened once */  in wb_smsc_wdt_open()
362 	pr_info("Watchdog enabled. Timeout set to %d %s\n",  in wb_smsc_wdt_open()
376 		pr_info("Watchdog disabled, sleeping again...\n");  in wb_smsc_wdt_release()
378 		pr_crit("Unexpected close, not stopping watchdog!\n");  in wb_smsc_wdt_release()
434 		.identity =		"SMsC 37B787 Watchdog",  in wb_smsc_wdt_ioctl()
519 	.name		= "watchdog",
531 	pr_info("SMsC 37B787 watchdog component driver "  in wb_smsc_wdt_init()
534 	if (!request_region(IOPORT, IOPORT_SIZE, "SMsC 37B787 watchdog")) {  in wb_smsc_wdt_init()
544 	/* init the watchdog timer */  in wb_smsc_wdt_init()
563 	pr_info("Watchdog initialized and sleeping (nowayout=%d)...\n",  in wb_smsc_wdt_init()
585 		pr_info("Watchdog disabled\n");  in wb_smsc_wdt_exit()
592 	pr_info("SMsC 37B787 watchdog component driver removed\n");  in wb_smsc_wdt_exit()
599 MODULE_DESCRIPTION("Driver for SMsC 37B787 watchdog component (Version "
614 		"Watchdog cannot be stopped once started (default="