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.
31 #include <linux/io.h>
36 MODULE_AUTHOR("Jorge Boncompte - DTI2 <jorge@dti2.net>");
53 /* Dog Food address - We use the game port address */
56 #define	REG		0x2e	/* The register to read/write */  macro
92 static int superio_inb(int reg)  in superio_inb()  argument
94 	outb(reg, REG);  in superio_inb()
98 static void superio_outb(int val, int reg)  in superio_outb()  argument
100 	outb(reg, REG);  in superio_outb()
104 static int superio_inw(int reg)  in superio_inw()  argument
107 	outb(reg++, REG);  in superio_inw()
109 	outb(reg, REG);  in superio_inw()
116 	outb(LDN, REG);  in superio_select()
123 	 * Try to reserve REG and REG + 1 for exclusive access.  in superio_enter()
125 	if (!request_muxed_region(REG, 2, NAME))  in superio_enter()
126 		return -EBUSY;  in superio_enter()
128 	outb(0x87, REG);  in superio_enter()
129 	outb(0x01, REG);  in superio_enter()
130 	outb(0x55, REG);  in superio_enter()
131 	outb(0x55, REG);  in superio_enter()
137 	outb(0x02, REG);  in superio_exit()
139 	release_region(REG, 2);  in superio_exit()
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()