1 // SPDX-License-Identifier: GPL-2.0+
3  *	sch311x_wdt.c - Driver for the SCH311x Super-I/O chips
10  *	provided "AS-IS" and at no charge.
23 #include <linux/errno.h>		/* For the -ENODEV/... values */
30 #include <linux/ioport.h>		/* For io-port access */
66 #define WATCHDOG_TIMEOUT 60		/* 60 sec default timeout */
80  *	Super-IO functions
119 	/* -- Watchdog Timeout --  in sch311x_wdt_set_timeout()
120 	 * Bit 0-6 (Reserved)  in sch311x_wdt_set_timeout()
121 	 * Bit 7   WDT Time-out Value Units Select  in sch311x_wdt_set_timeout()
126 	/* -- Watchdog Timer Time-out Value --  in sch311x_wdt_set_timeout()
127 	 * Bit 0-7 Binary coded units (0=Disabled, 1..255)  in sch311x_wdt_set_timeout()
141 	/* -- General Purpose I/O Bit 6.0 --  in sch311x_wdt_start()
144 	 * Bit 2-3, Function select: 00 = GPI/O, 01 = LED1, 11 = WDT,  in sch311x_wdt_start()
146 	 * Bit 4-6  (Reserved)  in sch311x_wdt_start()
181 		return -EINVAL;  in sch311x_wdt_set_heartbeat()
184 	 * we will round up to minutes (with a max of 255) */  in sch311x_wdt_set_heartbeat()
186 		t = (((t - 1) / 60) + 1) * 60;  in sch311x_wdt_set_heartbeat()
200 	/* -- Watchdog timer control --  in sch311x_wdt_get_status()
203 	 * Bit 2   Force Timeout: 1 = Forces WD timeout event (self-cleaning)  in sch311x_wdt_get_status()
208 	 * Bit 4-7 Reserved  in sch311x_wdt_get_status()
233 					return -EFAULT;  in sch311x_wdt_write()
261 			return -EFAULT;  in sch311x_wdt_ioctl()
274 		int options, retval = -EINVAL;  in sch311x_wdt_ioctl()
277 			return -EFAULT;  in sch311x_wdt_ioctl()
294 			return -EFAULT;  in sch311x_wdt_ioctl()
296 			return -EINVAL;  in sch311x_wdt_ioctl()
302 		return -ENOTTY;  in sch311x_wdt_ioctl()
310 		return -EBUSY;  in sch311x_wdt_open()
357 	struct device *dev = &pdev->dev;  in sch311x_wdt_probe()
363 		dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",  in sch311x_wdt_probe()
366 		err = -EBUSY;  in sch311x_wdt_probe()
372 		dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",  in sch311x_wdt_probe()
375 		err = -EBUSY;  in sch311x_wdt_probe()
383 	/* -- Watchdog timer configuration --  in sch311x_wdt_probe()
388 	 * Bit 4-7 WDT Interrupt Mapping: (0000* = Disabled,  in sch311x_wdt_probe()
393 	/* Check that the heartbeat value is within it's range ;  in sch311x_wdt_probe()
414 		"SMSC SCH311x WDT initialized. timeout=%d sec (nowayout=%d)\n",  in sch311x_wdt_probe()
468 		err = -ENODEV;  in sch311x_detect()
485 		err = -ENODEV;  in sch311x_detect()
507 		return -ENODEV;  in sch311x_wdt_init()