1 // SPDX-License-Identifier: GPL-2.0-or-later
10  *	software is provided AS-IS with no warranties.
49 #define	MAX_TIMEOUT	255	/* 255 minutes */
59 #define WDTO		0x05	/* Watchdog timeout register */
63 /* WDCF bitfields - which devices assert WDO */
68 /* 5 -7 are reserved */
70 static int timeout = 1;  variable
71 static int io = -1;
88 module_param(timeout, int, 0);
89 MODULE_PARM_DESC(timeout, "range is 0-255 minutes, default is 1");
140 	/* set the timeout and get the ball rolling */  in sc1200wdt_start()
141 	__sc1200wdt_write_data(WDTO, timeout);  in sc1200wdt_start()
168 		return -EBUSY;  in sc1200wdt_open()
170 	if (timeout > MAX_TIMEOUT)  in sc1200wdt_open()
171 		timeout = MAX_TIMEOUT;  in sc1200wdt_open()
174 	pr_info("Watchdog enabled, timeout = %d min(s)", timeout);  in sc1200wdt_open()
196 			return -EFAULT;  in sc1200wdt_ioctl()
207 		int options, retval = -EINVAL;  in sc1200wdt_ioctl()
210 			return -EFAULT;  in sc1200wdt_ioctl()
225 		sc1200wdt_write_data(WDTO, timeout);  in sc1200wdt_ioctl()
230 			return -EFAULT;  in sc1200wdt_ioctl()
234 			return -EINVAL;  in sc1200wdt_ioctl()
235 		timeout = new_timeout;  in sc1200wdt_ioctl()
236 		sc1200wdt_write_data(WDTO, timeout);  in sc1200wdt_ioctl()
237 		fallthrough;	/* and return the new timeout */  in sc1200wdt_ioctl()
240 		return put_user(timeout * 60, p);  in sc1200wdt_ioctl()
243 		return -ENOTTY;  in sc1200wdt_ioctl()
254 		sc1200wdt_write_data(WDTO, timeout);  in sc1200wdt_release()
255 		pr_crit("Unexpected close!, timeout = %d min(s)\n", timeout);  in sc1200wdt_release()
277 					return -EFAULT;  in sc1200wdt_write()
283 		sc1200wdt_write_data(WDTO, timeout);  in sc1200wdt_write()
335 	return (reg == 0x0e) ? 0 : -ENODEV;  in sc1200wdt_probe()
352 		return -EBUSY;  in scl200wdt_pnp_probe()
360 		return -EBUSY;  in scl200wdt_pnp_probe()
399 	if (io == -1) {  in sc1200wdt_init()
401 		ret = -EINVAL;  in sc1200wdt_init()
415 		ret = -EBUSY;  in sc1200wdt_init()