[mirror_ubuntu-artful-kernel.git] / drivers / char / toshiba.c

/* toshiba.c -- Linux driver for accessing the SMM on Toshiba laptops
 *
 * Copyright (c) 1996-2001  Jonathan A. Buzzard (jonathan@buzzard.org.uk)
 *
 * Valuable assistance and patches from:
 *     Tom May <tom@you-bastards.com>
 *     Rob Napier <rnapier@employees.org>
 *
 * Fn status port numbers for machine ID's courtesy of
 *     0xfc02: Scott Eisert <scott.e@sky-eye.com>
 *     0xfc04: Steve VanDevender <stevev@efn.org>
 *     0xfc08: Garth Berry <garth@itsbruce.net>
 *     0xfc0a: Egbert Eich <eich@xfree86.org>
 *     0xfc10: Andrew Lofthouse <Andrew.Lofthouse@robins.af.mil>
 *     0xfc11: Spencer Olson <solson@novell.com>
 *     0xfc13: Claudius Frankewitz <kryp@gmx.de>
 *     0xfc15: Tom May <tom@you-bastards.com>
 *     0xfc17: Dave Konrad <konrad@xenia.it>
 *     0xfc1a: George Betzos <betzos@engr.colostate.edu>
 *     0xfc1b: Munemasa Wada <munemasa@jnovel.co.jp>
 *     0xfc1d: Arthur Liu <armie@slap.mine.nu>
 *     0xfc5a: Jacques L'helgoualc'h <lhh@free.fr>
 *     0xfcd1: Mr. Dave Konrad <konrad@xenia.it>
 *
 * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
 *
 *   This code is covered by the GNU GPL and you are free to make any
 *   changes you wish to it under the terms of the license. However the
 *   code has the potential to render your computer and/or someone else's
 *   unusable. Please proceed with care when modifying the code.
 *
 * Note: Unfortunately the laptop hardware can close the System Configuration
 *       Interface on it's own accord. It is therefore necessary for *all*
 *       programs using this driver to be aware that *any* SCI call can fail at
 *       *any* time. It is up to any program to be aware of this eventuality
 *       and take appropriate steps.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * The information used to write this driver has been obtained by reverse
 * engineering the software supplied by Toshiba for their portable computers in
 * strict accordance with the European Council Directive 92/250/EEC on the legal
 * protection of computer programs, and it's implementation into English Law by
 * the Copyright (Computer Programs) Regulations 1992 (S.I. 1992 No.3233).
 *
 */

#define TOSH_VERSION "1.11 26/9/2001"
#define TOSH_DEBUG 0

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/miscdevice.h>
#include <linux/ioport.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/init.h>
#include <linux/stat.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>

#include <linux/toshiba.h>

#define TOSH_MINOR_DEV 181

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jonathan Buzzard <jonathan@buzzard.org.uk>");
MODULE_DESCRIPTION("Toshiba laptop SMM driver");
MODULE_SUPPORTED_DEVICE("toshiba");

static int tosh_fn;
module_param_named(fn, tosh_fn, int, 0);
MODULE_PARM_DESC(fn, "User specified Fn key detection port");

static int tosh_id;
static int tosh_bios;
static int tosh_date;
static int tosh_sci;
static int tosh_fan;

static int tosh_ioctl(struct inode *, struct file *, unsigned int,
	unsigned long);


static const struct file_operations tosh_fops = {
	.owner		= THIS_MODULE,
	.ioctl		= tosh_ioctl,
};

static struct miscdevice tosh_device = {
	TOSH_MINOR_DEV,
	"toshiba",
	&tosh_fops
};

/*
 * Read the Fn key status
 */
#ifdef CONFIG_PROC_FS
static int tosh_fn_status(void)
{
        unsigned char scan;
	unsigned long flags;

	if (tosh_fn!=0) {
		scan = inb(tosh_fn);
	} else {
		local_irq_save(flags);
		outb(0x8e, 0xe4);
		scan = inb(0xe5);
		local_irq_restore(flags);
	}

        return (int) scan;
}
#endif


/*
 * For the Portage 610CT and the Tecra 700CS/700CDT emulate the HCI fan function
 */
static int tosh_emulate_fan(SMMRegisters *regs)
{
	unsigned long eax,ecx,flags;
	unsigned char al;

	eax = regs->eax & 0xff00;
	ecx = regs->ecx & 0xffff;

	/* Portage 610CT */

	if (tosh_id==0xfccb) {
		if (eax==0xfe00) {
			/* fan status */
			local_irq_save(flags);
			outb(0xbe, 0xe4);
			al = inb(0xe5);
			local_irq_restore(flags);
			regs->eax = 0x00;
			regs->ecx = (unsigned int) (al & 0x01);
		}
		if ((eax==0xff00) && (ecx==0x0000)) {
			/* fan off */
			local_irq_save(flags);
			outb(0xbe, 0xe4);
			al = inb(0xe5);
			outb(0xbe, 0xe4);
			outb (al | 0x01, 0xe5);
			local_irq_restore(flags);
			regs->eax = 0x00;
			regs->ecx = 0x00;
		}
		if ((eax==0xff00) && (ecx==0x0001)) {
			/* fan on */
			local_irq_save(flags);
			outb(0xbe, 0xe4);
			al = inb(0xe5);
			outb(0xbe, 0xe4);
			outb(al & 0xfe, 0xe5);
			local_irq_restore(flags);
			regs->eax = 0x00;
			regs->ecx = 0x01;
		}
	}

	/* Tecra 700CS/CDT */

	if (tosh_id==0xfccc) {
		if (eax==0xfe00) {
			/* fan status */
			local_irq_save(flags);
			outb(0xe0, 0xe4);
			al = inb(0xe5);
			local_irq_restore(flags);
			regs->eax = 0x00;
			regs->ecx = al & 0x01;
		}
		if ((eax==0xff00) && (ecx==0x0000)) {
			/* fan off */
			local_irq_save(flags);
			outb(0xe0, 0xe4);
			al = inb(0xe5);
			outw(0xe0 | ((al & 0xfe) << 8), 0xe4);
			local_irq_restore(flags);
			regs->eax = 0x00;
			regs->ecx = 0x00;
		}
		if ((eax==0xff00) && (ecx==0x0001)) {
			/* fan on */
			local_irq_save(flags);
			outb(0xe0, 0xe4);
			al = inb(0xe5);
			outw(0xe0 | ((al | 0x01) << 8), 0xe4);
			local_irq_restore(flags);
			regs->eax = 0x00;
			regs->ecx = 0x01;
		}
	}

	return 0;
}


/*
 * Put the laptop into System Management Mode
 */
int tosh_smm(SMMRegisters *regs)
{
	int eax;

	asm ("# load the values into the registers\n\t" \
		"pushl %%eax\n\t" \
		"movl 0(%%eax),%%edx\n\t" \
		"push %%edx\n\t" \
		"movl 4(%%eax),%%ebx\n\t" \
		"movl 8(%%eax),%%ecx\n\t" \
		"movl 12(%%eax),%%edx\n\t" \
		"movl 16(%%eax),%%esi\n\t" \
		"movl 20(%%eax),%%edi\n\t" \
		"popl %%eax\n\t" \
		"# call the System Management mode\n\t" \
		"inb $0xb2,%%al\n\t"
		"# fill out the memory with the values in the registers\n\t" \
		"xchgl %%eax,(%%esp)\n\t"
		"movl %%ebx,4(%%eax)\n\t" \
		"movl %%ecx,8(%%eax)\n\t" \
		"movl %%edx,12(%%eax)\n\t" \
		"movl %%esi,16(%%eax)\n\t" \
		"movl %%edi,20(%%eax)\n\t" \
		"popl %%edx\n\t" \
		"movl %%edx,0(%%eax)\n\t" \
		"# setup the return value to the carry flag\n\t" \
		"lahf\n\t" \
		"shrl $8,%%eax\n\t" \
		"andl $1,%%eax\n" \
		: "=a" (eax)
		: "a" (regs)
		: "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");

	return eax;
}
EXPORT_SYMBOL(tosh_smm);


static int tosh_ioctl(struct inode *ip, struct file *fp, unsigned int cmd,
	unsigned long arg)
{
	SMMRegisters regs;
	SMMRegisters __user *argp = (SMMRegisters __user *)arg;
	unsigned short ax,bx;
	int err;

	if (!argp)
		return -EINVAL;

	if (copy_from_user(&regs, argp, sizeof(SMMRegisters)))
		return -EFAULT;

	switch (cmd) {
		case TOSH_SMM:
			ax = regs.eax & 0xff00;
			bx = regs.ebx & 0xffff;
			/* block HCI calls to read/write memory & PCI devices */
			if (((ax==0xff00) || (ax==0xfe00)) && (bx>0x0069))
				return -EINVAL;

			/* do we need to emulate the fan ? */
			if (tosh_fan==1) {
				if (((ax==0xf300) || (ax==0xf400)) && (bx==0x0004)) {
					err = tosh_emulate_fan(&regs);
					break;
				}
			}
			err = tosh_smm(&regs);
			break;
		default:
			return -EINVAL;
	}

        if (copy_to_user(argp, &regs, sizeof(SMMRegisters)))
        	return -EFAULT;

	return (err==0) ? 0:-EINVAL;
}


/*
 * Print the information for /proc/toshiba
 */
#ifdef CONFIG_PROC_FS
static int proc_toshiba_show(struct seq_file *m, void *v)
{
	int key;

	key = tosh_fn_status();

	/* Arguments
	     0) Linux driver version (this will change if format changes)
	     1) Machine ID
	     2) SCI version
	     3) BIOS version (major, minor)
	     4) BIOS date (in SCI date format)
	     5) Fn Key status
	*/
	seq_printf(m, "1.1 0x%04x %d.%d %d.%d 0x%04x 0x%02x\n",
		tosh_id,
		(tosh_sci & 0xff00)>>8,
		tosh_sci & 0xff,
		(tosh_bios & 0xff00)>>8,
		tosh_bios & 0xff,
		tosh_date,
		key);
	return 0;
}

static int proc_toshiba_open(struct inode *inode, struct file *file)
{
	return single_open(file, proc_toshiba_show, NULL);
}

static const struct file_operations proc_toshiba_fops = {
	.owner		= THIS_MODULE,
	.open		= proc_toshiba_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};
#endif


/*
 * Determine which port to use for the Fn key status
 */
static void tosh_set_fn_port(void)
{
	switch (tosh_id) {
		case 0xfc02: case 0xfc04: case 0xfc09: case 0xfc0a: case 0xfc10:
		case 0xfc11: case 0xfc13: case 0xfc15: case 0xfc1a: case 0xfc1b:
		case 0xfc5a:
			tosh_fn = 0x62;
			break;
		case 0xfc08: case 0xfc17: case 0xfc1d: case 0xfcd1: case 0xfce0:
		case 0xfce2:
			tosh_fn = 0x68;
			break;
		default:
			tosh_fn = 0x00;
			break;
	}

	return;
}


/*
 * Get the machine identification number of the current model
 */
static int tosh_get_machine_id(void __iomem *bios)
{
	int id;
	SMMRegisters regs;
	unsigned short bx,cx;
	unsigned long address;

	id = (0x100*(int) readb(bios+0xfffe))+((int) readb(bios+0xfffa));

	/* do we have a SCTTable machine identication number on our hands */

	if (id==0xfc2f) {

		/* start by getting a pointer into the BIOS */

		regs.eax = 0xc000;
		regs.ebx = 0x0000;
		regs.ecx = 0x0000;
		tosh_smm(&regs);
		bx = (unsigned short) (regs.ebx & 0xffff);

		/* At this point in the Toshiba routines under MS Windows
		   the bx register holds 0xe6f5. However my code is producing
		   a different value! For the time being I will just fudge the
		   value. This has been verified on a Satellite Pro 430CDT,
		   Tecra 750CDT, Tecra 780DVD and Satellite 310CDT. */
#if TOSH_DEBUG
		printk("toshiba: debugging ID ebx=0x%04x\n", regs.ebx);
#endif
		bx = 0xe6f5;

		/* now twiddle with our pointer a bit */

		address = bx;
		cx = readw(bios + address);
		address = 9+bx+cx;
		cx = readw(bios + address);
		address = 0xa+cx;
		cx = readw(bios + address);

		/* now construct our machine identification number */

		id = ((cx & 0xff)<<8)+((cx & 0xff00)>>8);
	}

	return id;
}


/*
 * Probe for the presence of a Toshiba laptop
 *
 *   returns and non-zero if unable to detect the presence of a Toshiba
 *   laptop, otherwise zero and determines the Machine ID, BIOS version and
 *   date, and SCI version.
 */
static int tosh_probe(void)
{
	int i,major,minor,day,year,month,flag;
	unsigned char signature[7] = { 0x54,0x4f,0x53,0x48,0x49,0x42,0x41 };
	SMMRegisters regs;
	void __iomem *bios = ioremap_cache(0xf0000, 0x10000);

	if (!bios)
		return -ENOMEM;

	/* extra sanity check for the string "TOSHIBA" in the BIOS because
	   some machines that are not Toshiba's pass the next test */

	for (i=0;i<7;i++) {
		if (readb(bios+0xe010+i)!=signature[i]) {
			printk("toshiba: not a supported Toshiba laptop\n");
			iounmap(bios);
			return -ENODEV;
		}
	}

	/* call the Toshiba SCI support check routine */

	regs.eax = 0xf0f0;
	regs.ebx = 0x0000;
	regs.ecx = 0x0000;
	flag = tosh_smm(&regs);

	/* if this is not a Toshiba laptop carry flag is set and ah=0x86 */

	if ((flag==1) || ((regs.eax & 0xff00)==0x8600)) {
		printk("toshiba: not a supported Toshiba laptop\n");
		iounmap(bios);
		return -ENODEV;
	}

	/* if we get this far then we are running on a Toshiba (probably)! */

	tosh_sci = regs.edx & 0xffff;

	/* next get the machine ID of the current laptop */

	tosh_id = tosh_get_machine_id(bios);

	/* get the BIOS version */

	major = readb(bios+0xe009)-'0';
	minor = ((readb(bios+0xe00b)-'0')*10)+(readb(bios+0xe00c)-'0');
	tosh_bios = (major*0x100)+minor;

	/* get the BIOS date */

	day = ((readb(bios+0xfff5)-'0')*10)+(readb(bios+0xfff6)-'0');
	month = ((readb(bios+0xfff8)-'0')*10)+(readb(bios+0xfff9)-'0');
	year = ((readb(bios+0xfffb)-'0')*10)+(readb(bios+0xfffc)-'0');
	tosh_date = (((year-90) & 0x1f)<<10) | ((month & 0xf)<<6)
		| ((day & 0x1f)<<1);


	/* in theory we should check the ports we are going to use for the
	   fn key detection (and the fan on the Portage 610/Tecra700), and
	   then request them to stop other drivers using them. However as
	   the keyboard driver grabs 0x60-0x6f and the pic driver grabs
	   0xa0-0xbf we can't. We just have to live dangerously and use the
	   ports anyway, oh boy! */

	/* do we need to emulate the fan? */

	if ((tosh_id==0xfccb) || (tosh_id==0xfccc))
		tosh_fan = 1;

	iounmap(bios);

	return 0;
}

static int __init toshiba_init(void)
{
	int retval;
	/* are we running on a Toshiba laptop */

	if (tosh_probe())
		return -ENODEV;

	printk(KERN_INFO "Toshiba System Management Mode driver v" TOSH_VERSION "\n");

	/* set the port to use for Fn status if not specified as a parameter */
	if (tosh_fn==0x00)
		tosh_set_fn_port();

	/* register the device file */
	retval = misc_register(&tosh_device);
	if (retval < 0)
		return retval;

#ifdef CONFIG_PROC_FS
	{
		struct proc_dir_entry *pde;

		pde = proc_create("toshiba", 0, NULL, &proc_toshiba_fops);
		if (!pde) {
			misc_deregister(&tosh_device);
			return -ENOMEM;
		}
	}
#endif

	return 0;
}

static void __exit toshiba_exit(void)
{
	remove_proc_entry("toshiba", NULL);
	misc_deregister(&tosh_device);
}

module_init(toshiba_init);
module_exit(toshiba_exit);
Commit	Line	Data
1da177e4 LT	1	/* toshiba.c -- Linux driver for accessing the SMM on Toshiba laptops
	2	*
	3	* Copyright (c) 1996-2001 Jonathan A. Buzzard (jonathan@buzzard.org.uk)
	4	*
	5	* Valuable assistance and patches from:
	6	* Tom May <tom@you-bastards.com>
	7	* Rob Napier <rnapier@employees.org>
	8	*
	9	* Fn status port numbers for machine ID's courtesy of
	10	* 0xfc02: Scott Eisert <scott.e@sky-eye.com>
	11	* 0xfc04: Steve VanDevender <stevev@efn.org>
	12	* 0xfc08: Garth Berry <garth@itsbruce.net>
	13	* 0xfc0a: Egbert Eich <eich@xfree86.org>
	14	* 0xfc10: Andrew Lofthouse <Andrew.Lofthouse@robins.af.mil>
	15	* 0xfc11: Spencer Olson <solson@novell.com>
	16	* 0xfc13: Claudius Frankewitz <kryp@gmx.de>
	17	* 0xfc15: Tom May <tom@you-bastards.com>
	18	* 0xfc17: Dave Konrad <konrad@xenia.it>
	19	* 0xfc1a: George Betzos <betzos@engr.colostate.edu>
	20	* 0xfc1b: Munemasa Wada <munemasa@jnovel.co.jp>
	21	* 0xfc1d: Arthur Liu <armie@slap.mine.nu>
	22	* 0xfc5a: Jacques L'helgoualc'h <lhh@free.fr>
	23	* 0xfcd1: Mr. Dave Konrad <konrad@xenia.it>
	24	*
	25	* WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
	26	*
	27	* This code is covered by the GNU GPL and you are free to make any
	28	* changes you wish to it under the terms of the license. However the
	29	* code has the potential to render your computer and/or someone else's
	30	* unusable. Please proceed with care when modifying the code.
	31	*
	32	* Note: Unfortunately the laptop hardware can close the System Configuration
	33	* Interface on it's own accord. It is therefore necessary for all
	34	* programs using this driver to be aware that any SCI call can fail at
	35	* any time. It is up to any program to be aware of this eventuality
	36	* and take appropriate steps.
	37	*
	38	* This program is free software; you can redistribute it and/or modify it
	39	* under the terms of the GNU General Public License as published by the
	40	* Free Software Foundation; either version 2, or (at your option) any
	41	* later version.
	42	*
	43	* This program is distributed in the hope that it will be useful, but
	44	* WITHOUT ANY WARRANTY; without even the implied warranty of
	45	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	46	* General Public License for more details.
	47	*
	48	* The information used to write this driver has been obtained by reverse
	49	* engineering the software supplied by Toshiba for their portable computers in
	50	* strict accordance with the European Council Directive 92/250/EEC on the legal
	51	* protection of computer programs, and it's implementation into English Law by
	52	* the Copyright (Computer Programs) Regulations 1992 (S.I. 1992 No.3233).
	53	*
	54	*/
	55
	56	#define TOSH_VERSION "1.11 26/9/2001"
	57	#define TOSH_DEBUG 0
	58
	59	#include <linux/module.h>
	60	#include <linux/kernel.h>
1da177e4 LT	61	#include <linux/types.h>
	62	#include <linux/fcntl.h>
	63	#include <linux/miscdevice.h>
	64	#include <linux/ioport.h>
	65	#include <asm/io.h>
	66	#include <asm/uaccess.h>
	67	#include <linux/init.h>
	68	#include <linux/stat.h>
	69	#include <linux/proc_fs.h>
967bb77c	70	#include <linux/seq_file.h>
1da177e4 LT	71
	72	#include <linux/toshiba.h>
	73
	74	#define TOSH_MINOR_DEV 181
	75
3f5f7e2e DT	76	MODULE_LICENSE("GPL");
	77	MODULE_AUTHOR("Jonathan Buzzard <jonathan@buzzard.org.uk>");
	78	MODULE_DESCRIPTION("Toshiba laptop SMM driver");
	79	MODULE_SUPPORTED_DEVICE("toshiba");
1da177e4	80
3f5f7e2e DT	81	static int tosh_fn;
	82	module_param_named(fn, tosh_fn, int, 0);
	83	MODULE_PARM_DESC(fn, "User specified Fn key detection port");
1da177e4	84
3f5f7e2e DT	85	static int tosh_id;
	86	static int tosh_bios;
	87	static int tosh_date;
	88	static int tosh_sci;
	89	static int tosh_fan;
1da177e4 LT	90
	91	static int tosh_ioctl(struct inode , struct file , unsigned int,
	92	unsigned long);
	93
	94
62322d25	95	static const struct file_operations tosh_fops = {
1da177e4 LT	96	.owner = THIS_MODULE,
	97	.ioctl = tosh_ioctl,
	98	};
	99
	100	static struct miscdevice tosh_device = {
	101	TOSH_MINOR_DEV,
	102	"toshiba",
	103	&tosh_fops
	104	};
	105
	106	/*
	107	* Read the Fn key status
	108	*/
	109	#ifdef CONFIG_PROC_FS
	110	static int tosh_fn_status(void)
	111	{
	112	unsigned char scan;
	113	unsigned long flags;
	114
	115	if (tosh_fn!=0) {
	116	scan = inb(tosh_fn);
	117	} else {
	118	local_irq_save(flags);
	119	outb(0x8e, 0xe4);
	120	scan = inb(0xe5);
	121	local_irq_restore(flags);
	122	}
	123
	124	return (int) scan;
	125	}
	126	#endif
	127
	128
	129	/*
	130	* For the Portage 610CT and the Tecra 700CS/700CDT emulate the HCI fan function
	131	*/
	132	static int tosh_emulate_fan(SMMRegisters *regs)
	133	{
	134	unsigned long eax,ecx,flags;
	135	unsigned char al;
	136
	137	eax = regs->eax & 0xff00;
	138	ecx = regs->ecx & 0xffff;
	139
	140	/* Portage 610CT */
	141
	142	if (tosh_id==0xfccb) {
	143	if (eax==0xfe00) {
	144	/* fan status */
	145	local_irq_save(flags);
	146	outb(0xbe, 0xe4);
	147	al = inb(0xe5);
	148	local_irq_restore(flags);
	149	regs->eax = 0x00;
	150	regs->ecx = (unsigned int) (al & 0x01);
	151	}
	152	if ((eax==0xff00) && (ecx==0x0000)) {
	153	/* fan off */
	154	local_irq_save(flags);
	155	outb(0xbe, 0xe4);
	156	al = inb(0xe5);
	157	outb(0xbe, 0xe4);
	158	outb (al \| 0x01, 0xe5);
	159	local_irq_restore(flags);
160	regs->eax = 0x00;
161	regs->ecx = 0x00;
162	}
163	if ((eax==0xff00) && (ecx==0x0001)) {
164	/* fan on */
165	local_irq_save(flags);
166	outb(0xbe, 0xe4);
167	al = inb(0xe5);
168	outb(0xbe, 0xe4);
169	outb(al & 0xfe, 0xe5);
170	local_irq_restore(flags);
171	regs->eax = 0x00;
172	regs->ecx = 0x01;
173	}
174	}
175
176	/* Tecra 700CS/CDT */
177
178	if (tosh_id==0xfccc) {
179	if (eax==0xfe00) {
180	/* fan status */
181	local_irq_save(flags);
182	outb(0xe0, 0xe4);
183	al = inb(0xe5);
184	local_irq_restore(flags);
185	regs->eax = 0x00;
186	regs->ecx = al & 0x01;
187	}
188	if ((eax==0xff00) && (ecx==0x0000)) {
189	/* fan off */
190	local_irq_save(flags);
191	outb(0xe0, 0xe4);
192	al = inb(0xe5);
193	outw(0xe0 \| ((al & 0xfe) << 8), 0xe4);
194	local_irq_restore(flags);
195	regs->eax = 0x00;
196	regs->ecx = 0x00;
197	}
198	if ((eax==0xff00) && (ecx==0x0001)) {
199	/* fan on */
200	local_irq_save(flags);
201	outb(0xe0, 0xe4);
202	al = inb(0xe5);
203	outw(0xe0 \| ((al \| 0x01) << 8), 0xe4);
204	local_irq_restore(flags);
205	regs->eax = 0x00;
206	regs->ecx = 0x01;
207	}
208	}
209
210	return 0;
211	}
212
213
214	/*
215	* Put the laptop into System Management Mode
216	*/
217	int tosh_smm(SMMRegisters *regs)
218	{
219	int eax;
220
221	asm ("# load the values into the registers\n\t" \
222	"pushl %%eax\n\t" \
223	"movl 0(%%eax),%%edx\n\t" \
224	"push %%edx\n\t" \
225	"movl 4(%%eax),%%ebx\n\t" \
226	"movl 8(%%eax),%%ecx\n\t" \
227	"movl 12(%%eax),%%edx\n\t" \
228	"movl 16(%%eax),%%esi\n\t" \
229	"movl 20(%%eax),%%edi\n\t" \
230	"popl %%eax\n\t" \
231	"# call the System Management mode\n\t" \
232	"inb $0xb2,%%al\n\t"
233	"# fill out the memory with the values in the registers\n\t" \
234	"xchgl %%eax,(%%esp)\n\t"
235	"movl %%ebx,4(%%eax)\n\t" \
236	"movl %%ecx,8(%%eax)\n\t" \
237	"movl %%edx,12(%%eax)\n\t" \
238	"movl %%esi,16(%%eax)\n\t" \
239	"movl %%edi,20(%%eax)\n\t" \
240	"popl %%edx\n\t" \
241	"movl %%edx,0(%%eax)\n\t" \
242	"# setup the return value to the carry flag\n\t" \
243	"lahf\n\t" \
244	"shrl $8,%%eax\n\t" \
245	"andl $1,%%eax\n" \
246	: "=a" (eax)
247	: "a" (regs)
248	: "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
249
250	return eax;
251	}
0bf93226	252	EXPORT_SYMBOL(tosh_smm);
1da177e4 LT	253
	254
	255	static int tosh_ioctl(struct inode ip, struct file fp, unsigned int cmd,
	256	unsigned long arg)
	257	{
	258	SMMRegisters regs;
	259	SMMRegisters __user argp = (SMMRegisters __user )arg;
	260	unsigned short ax,bx;
	261	int err;
	262
	263	if (!argp)
	264	return -EINVAL;
	265
	266	if (copy_from_user(&regs, argp, sizeof(SMMRegisters)))
	267	return -EFAULT;
	268
	269	switch (cmd) {
	270	case TOSH_SMM:
	271	ax = regs.eax & 0xff00;
	272	bx = regs.ebx & 0xffff;
	273	/* block HCI calls to read/write memory & PCI devices */
	274	if (((ax==0xff00) \|\| (ax==0xfe00)) && (bx>0x0069))
	275	return -EINVAL;
	276
	277	/* do we need to emulate the fan ? */
	278	if (tosh_fan==1) {
	279	if (((ax==0xf300) \|\| (ax==0xf400)) && (bx==0x0004)) {
	280	err = tosh_emulate_fan(&regs);
	281	break;
	282	}
	283	}
	284	err = tosh_smm(&regs);
	285	break;
	286	default:
	287	return -EINVAL;
	288	}
	289
	290	if (copy_to_user(argp, &regs, sizeof(SMMRegisters)))
	291	return -EFAULT;
	292
	293	return (err==0) ? 0:-EINVAL;
	294	}
	295
	296
	297	/*
	298	* Print the information for /proc/toshiba
	299	*/
	300	#ifdef CONFIG_PROC_FS
967bb77c	301	static int proc_toshiba_show(struct seq_file m, void v)
1da177e4	302	{
1da177e4 LT	303	int key;
1da177e4 LT	304
1da177e4 LT	305	key = tosh_fn_status();
	306
	307	/* Arguments
	308	0) Linux driver version (this will change if format changes)
	309	1) Machine ID
	310	2) SCI version
	311	3) BIOS version (major, minor)
	312	4) BIOS date (in SCI date format)
	313	5) Fn Key status
	314	*/
967bb77c	315	seq_printf(m, "1.1 0x%04x %d.%d %d.%d 0x%04x 0x%02x\n",
1da177e4 LT	316	tosh_id,
	317	(tosh_sci & 0xff00)>>8,
	318	tosh_sci & 0xff,
	319	(tosh_bios & 0xff00)>>8,
	320	tosh_bios & 0xff,
	321	tosh_date,
	322	key);
967bb77c AD	323	return 0;
967bb77c AD	324	}
1da177e4	325
967bb77c AD	326	static int proc_toshiba_open(struct inode inode, struct file file)
	327	{
	328	return single_open(file, proc_toshiba_show, NULL);
1da177e4	329	}
967bb77c AD	330
	331	static const struct file_operations proc_toshiba_fops = {
	332	.owner = THIS_MODULE,
	333	.open = proc_toshiba_open,
	334	.read = seq_read,
	335	.llseek = seq_lseek,
	336	.release = single_release,
	337	};
1da177e4 LT	338	#endif
	339
	340
	341	/*
	342	* Determine which port to use for the Fn key status
	343	*/
	344	static void tosh_set_fn_port(void)
	345	{
	346	switch (tosh_id) {
	347	case 0xfc02: case 0xfc04: case 0xfc09: case 0xfc0a: case 0xfc10:
	348	case 0xfc11: case 0xfc13: case 0xfc15: case 0xfc1a: case 0xfc1b:
	349	case 0xfc5a:
	350	tosh_fn = 0x62;
	351	break;
	352	case 0xfc08: case 0xfc17: case 0xfc1d: case 0xfcd1: case 0xfce0:
	353	case 0xfce2:
	354	tosh_fn = 0x68;
	355	break;
	356	default:
	357	tosh_fn = 0x00;
	358	break;
	359	}
	360
	361	return;
	362	}
	363
	364
	365	/*
	366	* Get the machine identification number of the current model
	367	*/
ef5a4c8b	368	static int tosh_get_machine_id(void __iomem *bios)
1da177e4 LT	369	{
	370	int id;
	371	SMMRegisters regs;
	372	unsigned short bx,cx;
	373	unsigned long address;
	374
ef5a4c8b	375	id = (0x100*(int) readb(bios+0xfffe))+((int) readb(bios+0xfffa));
3f5f7e2e	376
1da177e4 LT	377	/* do we have a SCTTable machine identication number on our hands */
	378
	379	if (id==0xfc2f) {
	380
	381	/* start by getting a pointer into the BIOS */
	382
	383	regs.eax = 0xc000;
	384	regs.ebx = 0x0000;
	385	regs.ecx = 0x0000;
	386	tosh_smm(&regs);
	387	bx = (unsigned short) (regs.ebx & 0xffff);
	388
	389	/* At this point in the Toshiba routines under MS Windows
	390	the bx register holds 0xe6f5. However my code is producing
	391	a different value! For the time being I will just fudge the
	392	value. This has been verified on a Satellite Pro 430CDT,
	393	Tecra 750CDT, Tecra 780DVD and Satellite 310CDT. */
	394	#if TOSH_DEBUG
	395	printk("toshiba: debugging ID ebx=0x%04x\n", regs.ebx);
	396	#endif
	397	bx = 0xe6f5;
	398
	399	/* now twiddle with our pointer a bit */
	400
ef5a4c8b AV	401	address = bx;
	402	cx = readw(bios + address);
	403	address = 9+bx+cx;
	404	cx = readw(bios + address);
	405	address = 0xa+cx;
	406	cx = readw(bios + address);
1da177e4 LT	407
	408	/* now construct our machine identification number */
	409
	410	id = ((cx & 0xff)<<8)+((cx & 0xff00)>>8);
	411	}
	412
	413	return id;
	414	}
	415
	416
	417	/*
	418	* Probe for the presence of a Toshiba laptop
	419	*
	420	* returns and non-zero if unable to detect the presence of a Toshiba
	421	* laptop, otherwise zero and determines the Machine ID, BIOS version and
	422	* date, and SCI version.
	423	*/
	424	static int tosh_probe(void)
	425	{
	426	int i,major,minor,day,year,month,flag;
	427	unsigned char signature[7] = { 0x54,0x4f,0x53,0x48,0x49,0x42,0x41 };
	428	SMMRegisters regs;
1dcf83fd	429	void __iomem *bios = ioremap_cache(0xf0000, 0x10000);
ef5a4c8b AV	430
	431	if (!bios)
	432	return -ENOMEM;
1da177e4 LT	433
	434	/* extra sanity check for the string "TOSHIBA" in the BIOS because
	435	some machines that are not Toshiba's pass the next test */
	436
	437	for (i=0;i<7;i++) {
ef5a4c8b	438	if (readb(bios+0xe010+i)!=signature[i]) {
1da177e4	439	printk("toshiba: not a supported Toshiba laptop\n");
ef5a4c8b	440	iounmap(bios);
1da177e4 LT	441	return -ENODEV;
	442	}
	443	}
	444
	445	/* call the Toshiba SCI support check routine */
3f5f7e2e	446
1da177e4 LT	447	regs.eax = 0xf0f0;
	448	regs.ebx = 0x0000;
	449	regs.ecx = 0x0000;
	450	flag = tosh_smm(&regs);
	451
	452	/* if this is not a Toshiba laptop carry flag is set and ah=0x86 */
	453
	454	if ((flag==1) \|\| ((regs.eax & 0xff00)==0x8600)) {
	455	printk("toshiba: not a supported Toshiba laptop\n");
ef5a4c8b	456	iounmap(bios);
1da177e4 LT	457	return -ENODEV;
	458	}
	459
	460	/* if we get this far then we are running on a Toshiba (probably)! */
	461
	462	tosh_sci = regs.edx & 0xffff;
3f5f7e2e	463
1da177e4 LT	464	/* next get the machine ID of the current laptop */
1da177e4 LT	465
ef5a4c8b	466	tosh_id = tosh_get_machine_id(bios);
1da177e4 LT	467
	468	/* get the BIOS version */
	469
ef5a4c8b AV	470	major = readb(bios+0xe009)-'0';
ef5a4c8b AV	471	minor = ((readb(bios+0xe00b)-'0')*10)+(readb(bios+0xe00c)-'0');
1da177e4 LT	472	tosh_bios = (major*0x100)+minor;
	473
	474	/* get the BIOS date */
	475
ef5a4c8b AV	476	day = ((readb(bios+0xfff5)-'0')*10)+(readb(bios+0xfff6)-'0');
	477	month = ((readb(bios+0xfff8)-'0')*10)+(readb(bios+0xfff9)-'0');
	478	year = ((readb(bios+0xfffb)-'0')*10)+(readb(bios+0xfffc)-'0');
1da177e4 LT	479	tosh_date = (((year-90) & 0x1f)<<10) \| ((month & 0xf)<<6)
	480	\| ((day & 0x1f)<<1);
	481
	482
	483	/* in theory we should check the ports we are going to use for the
	484	fn key detection (and the fan on the Portage 610/Tecra700), and
	485	then request them to stop other drivers using them. However as
	486	the keyboard driver grabs 0x60-0x6f and the pic driver grabs
	487	0xa0-0xbf we can't. We just have to live dangerously and use the
	488	ports anyway, oh boy! */
	489
	490	/* do we need to emulate the fan? */
	491
	492	if ((tosh_id==0xfccb) \|\| (tosh_id==0xfccc))
	493	tosh_fan = 1;
	494
ef5a4c8b AV	495	iounmap(bios);
ef5a4c8b AV	496
1da177e4 LT	497	return 0;
	498	}
	499
3f5f7e2e	500	static int __init toshiba_init(void)
1da177e4 LT	501	{
	502	int retval;
	503	/* are we running on a Toshiba laptop */
	504
3f5f7e2e DT	505	if (tosh_probe())
3f5f7e2e DT	506	return -ENODEV;
1da177e4	507
8dfba4d7	508	printk(KERN_INFO "Toshiba System Management Mode driver v" TOSH_VERSION "\n");
1da177e4 LT	509
	510	/* set the port to use for Fn status if not specified as a parameter */
	511	if (tosh_fn==0x00)
	512	tosh_set_fn_port();
	513
	514	/* register the device file */
	515	retval = misc_register(&tosh_device);
3f5f7e2e	516	if (retval < 0)
1da177e4 LT	517	return retval;
	518
	519	#ifdef CONFIG_PROC_FS
967bb77c AD	520	{
	521	struct proc_dir_entry *pde;
	522
1b502217	523	pde = proc_create("toshiba", 0, NULL, &proc_toshiba_fops);
967bb77c AD	524	if (!pde) {
	525	misc_deregister(&tosh_device);
	526	return -ENOMEM;
	527	}
1da177e4 LT	528	}
	529	#endif
	530
	531	return 0;
	532	}
	533
3f5f7e2e	534	static void __exit toshiba_exit(void)
1da177e4	535	{
1da177e4	536	remove_proc_entry("toshiba", NULL);
1da177e4 LT	537	misc_deregister(&tosh_device);
1da177e4 LT	538	}
1da177e4	539
3f5f7e2e DT	540	module_init(toshiba_init);
3f5f7e2e DT	541	module_exit(toshiba_exit);
1da177e4	542