drivers/watchdog/it8712f_wdt.c

1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *	IT8712F "Smart Guardian" Watchdog support
5  *	Copyright (c) 2006-2007 Jorge Boncompte - DTI2 <jorge@dti2.net>
9  *	drivers/char/watchdog/scx200_wdt.c
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.
25 #include <linux/watchdog.h>
36 MODULE_AUTHOR("Jorge Boncompte - DTI2 <jorge@dti2.net>");
37 MODULE_DESCRIPTION("IT8712F Watchdog Driver");
43 MODULE_PARM_DESC(margin, "Watchdog margin in seconds");
47 MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
53 /* Dog Food address - We use the game port address */
67 #define LDN_GPIO	0x07	/* GPIO and Watch Dog Timer */
74 #define WDT_RESET_GAME	0x10	/* Reset timer on read or write to game port */
75 #define WDT_RESET_KBD	0x20	/* Reset timer on keyboard interrupt */
76 #define WDT_RESET_MOUSE	0x40	/* Reset timer on mouse interrupt */
77 #define WDT_RESET_CIR	0x80	/* Reset timer on consumer IR interrupt */
86 MODULE_PARM_DESC(wdt_control_reg, "Value to write to watchdog control "
87 		"register. The default WDT_RESET_GAME resets the timer on "
126 		return -EBUSY;  in superio_enter()
158 		pr_info("timer margin %d seconds\n", units);  in it8712f_wdt_update_margin()
161 		pr_info("timer margin %d minutes\n", units);  in it8712f_wdt_update_margin()
184 	pr_debug("enabling watchdog timer\n");  in it8712f_wdt_enable()
204 	pr_debug("disabling watchdog timer\n");  in it8712f_wdt_disable()
244 				return -EFAULT;  in it8712f_wdt_write()
259 		.identity = "IT8712F Watchdog",  in it8712f_wdt_ioctl()
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()
331 		pr_warn("watchdog device closed unexpectedly, will not disable the watchdog timer\n");  in it8712f_wdt_release()
334 			pr_warn("Watchdog disable failed\n");  in it8712f_wdt_release()
353 	.name = "watchdog",
359 	int err = -ENODEV;  in it8712f_wdt_find()
385 	/* Later revisions have 16-bit values per datasheet 0.9.1 */  in it8712f_wdt_find()
392 	pr_info("Found IT%04xF chip revision %d - using DogFood address 0x%x\n",  in it8712f_wdt_find()
405 		return -ENODEV;  in it8712f_wdt_init()
407 	if (!request_region(address, 1, "IT8712F Watchdog")) {  in it8712f_wdt_init()
408 		pr_warn("watchdog I/O region busy\n");  in it8712f_wdt_init()
409 		return -EBUSY;  in it8712f_wdt_init()
414 		pr_err("unable to disable watchdog timer\n");  in it8712f_wdt_init()