1 // SPDX-License-Identifier: GPL-2.0-or-later
7  *			-----------------------
9  *			-----------------------
10  *      14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
12  *	19-Dec-2001 Woody Suwalski: Netwinder fixes, ioctl interface
13  *	06-Jan-2002 Woody Suwalski: For compatibility, convert all timeouts
14  *				    from minutes to seconds.
15  *      07-Jul-2003 Daniele Bellucci: Audit return code of misc_register in
17  *      25-Oct-2005 Woody Suwalski: Convert addresses to #defs, add spinlocks
38 #include <asm/mach-types.h>
51 #define	DEFAULT_TIMEOUT	60			/* default timeout in seconds */
53 static	int timeout = DEFAULT_TIMEOUT;  variable
54 static	int timeoutM;				/* timeout in minutes */
60 module_param(timeout, int, 0);
61 MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (60..15300, default="
87 	 * F2 has the timeout in minutes  in wdt977_start()
89 	 *   at timeout, and to reset timer on kbd/mouse activity (not impl.)  in wdt977_start()
90 	 * F4 is used to just clear the TIMEOUT'ed state (bit 0)  in wdt977_start()
137 	* F4 can clear the TIMEOUT'ed state (bit 0) - back to default  in wdt977_stop()
169  * This is done by simply re-writing the timeout to reg. 0xF2
182 	/* F2 has the timeout in minutes */  in wdt977_keepalive()
196  * Set the watchdog timeout value
203 	/* convert seconds to minutes, rounding up */  in wdt977_set_timeout()
208 		 * only 30sec. This limits the max timeout to half of device  in wdt977_set_timeout()
209 		 * max of 255 minutes...  in wdt977_set_timeout()
215 		return -EINVAL;  in wdt977_set_timeout()
217 	/* timeout is the timeout in seconds, timeoutM is  in wdt977_set_timeout()
218 	   the timeout in minutes) */  in wdt977_set_timeout()
219 	timeout = t;  in wdt977_set_timeout()
266 		return -EBUSY;  in wdt977_open()
317 					return -EFAULT;  in wdt977_write()
352 	int new_options, retval = -EINVAL;  in wdt977_ioctl()
364 			sizeof(ident)) ? -EFAULT : 0;  in wdt977_ioctl()
375 			return -EFAULT;  in wdt977_ioctl()
395 			return -EFAULT;  in wdt977_ioctl()
398 			return -EINVAL;  in wdt977_ioctl()
404 		return put_user(timeout, uarg.i);  in wdt977_ioctl()
407 		return -ENOTTY;  in wdt977_ioctl()
446 	/* Check that the timeout value is within its range;  in wd977_init()
448 	if (wdt977_set_timeout(timeout)) {  in wd977_init()
450 		pr_info("timeout value must be 60 < timeout < 15300, using %d\n",  in wd977_init()
455 	 * arch/arm/mach-footbridge/netwinder-hw.c  in wd977_init()
461 			rc = -EIO;  in wd977_init()
479 	pr_info("initialized. timeout=%d sec (nowayout=%d, testmode=%i)\n",  in wd977_init()
480 		timeout, nowayout, testmode);  in wd977_init()