drivers/watchdog/it8712f_wdt.c

1 // SPDX-License-Identifier: GPL-2.0-or-later
5  *	Copyright (c) 2006-2007 Jorge Boncompte - DTI2 <jorge@dti2.net>
11  *	IT8712F EC-LPC I/O Preliminary Specification 0.8.2
12  *	IT8712F EC-LPC I/O Preliminary Specification 0.9.3
16  *	software is provided AS-IS with no warranties.
36 MODULE_AUTHOR("Jorge Boncompte - DTI2 <jorge@dti2.net>");
53 /* Dog Food address - We use the game port address */
72 #define WDT_TIMEOUT	0x73	/* WDT Register: Timeout Value */
79 #define WDT_UNIT_SEC	0x80	/* If 0 in MINUTES */
81 #define WDT_OUT_PWROK	0x10	/* Pulse PWROK on timeout */
82 #define WDT_OUT_KRST	0x40	/* Pulse reset on timeout */
126 		return -EBUSY;  in superio_enter()
153 	/* Switch to minutes precision if the configured margin  in it8712f_wdt_update_margin()
157 		config |= WDT_UNIT_SEC; /* else UNIT is MINUTES */  in it8712f_wdt_update_margin()
161 		pr_info("timer margin %d minutes\n", units);  in it8712f_wdt_update_margin()
244 				return -EFAULT;  in it8712f_wdt_write()
270 			return -EFAULT;  in it8712f_wdt_ioctl()
290 			return -EFAULT;  in it8712f_wdt_ioctl()
292 			return -EINVAL;  in it8712f_wdt_ioctl()
294 			return -EINVAL;  in it8712f_wdt_ioctl()
308 			return -EFAULT;  in it8712f_wdt_ioctl()
311 		return -ENOTTY;  in it8712f_wdt_ioctl()
320 		return -EBUSY;  in it8712f_wdt_open()
360 	int err = -ENODEV;  in it8712f_wdt_find()
386 	/* Later revisions have 16-bit values per datasheet 0.9.1 */  in it8712f_wdt_find()
393 	pr_info("Found IT%04xF chip revision %d - using DogFood address 0x%x\n",  in it8712f_wdt_find()
406 		return -ENODEV;  in it8712f_wdt_init()
410 		return -EBUSY;  in it8712f_wdt_init()