[linux-2.6-block.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/sched.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/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;
}


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 tosh_get_info(char *buffer, char **start, off_t fpos, int length)
{
	char *temp;
	int key;

	temp = buffer;
	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
	*/

	temp += sprintf(temp, "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 temp-buffer;
}
#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(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 Managment 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
	/* register the proc entry */
	if (create_proc_info_entry("toshiba", 0, NULL, tosh_get_info) == NULL) {
		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>
	61	#include <linux/sched.h>
	62	#include <linux/types.h>
	63	#include <linux/fcntl.h>
	64	#include <linux/miscdevice.h>
65	#include <linux/ioport.h>
66	#include <asm/io.h>
67	#include <asm/uaccess.h>
68	#include <linux/init.h>
69	#include <linux/stat.h>
70	#include <linux/proc_fs.h>
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	}
252
253
254	static int tosh_ioctl(struct inode ip, struct file fp, unsigned int cmd,
255	unsigned long arg)
256	{
257	SMMRegisters regs;
258	SMMRegisters __user argp = (SMMRegisters __user )arg;
259	unsigned short ax,bx;
260	int err;
261
262	if (!argp)
263	return -EINVAL;
264
265	if (copy_from_user(&regs, argp, sizeof(SMMRegisters)))
266	return -EFAULT;
267
268	switch (cmd) {
269	case TOSH_SMM:
270	ax = regs.eax & 0xff00;
271	bx = regs.ebx & 0xffff;
272	/* block HCI calls to read/write memory & PCI devices */
273	if (((ax==0xff00) \|\| (ax==0xfe00)) && (bx>0x0069))
274	return -EINVAL;
275
276	/* do we need to emulate the fan ? */
277	if (tosh_fan==1) {
278	if (((ax==0xf300) \|\| (ax==0xf400)) && (bx==0x0004)) {
279	err = tosh_emulate_fan(&regs);
280	break;
281	}
282	}
283	err = tosh_smm(&regs);
284	break;
285	default:
286	return -EINVAL;
287	}
288
289	if (copy_to_user(argp, &regs, sizeof(SMMRegisters)))
290	return -EFAULT;
291
292	return (err==0) ? 0:-EINVAL;
293	}
294
295
296	/*
297	* Print the information for /proc/toshiba
298	*/
299	#ifdef CONFIG_PROC_FS
300	static int tosh_get_info(char buffer, char *start, off_t fpos, int length)
301	{
302	char *temp;
303	int key;
304
305	temp = buffer;
306	key = tosh_fn_status();
307
308	/* Arguments
309	0) Linux driver version (this will change if format changes)
310	1) Machine ID
311	2) SCI version
312	3) BIOS version (major, minor)
313	4) BIOS date (in SCI date format)
314	5) Fn Key status
315	*/
316
317	temp += sprintf(temp, "1.1 0x%04x %d.%d %d.%d 0x%04x 0x%02x\n",
318	tosh_id,
319	(tosh_sci & 0xff00)>>8,
320	tosh_sci & 0xff,
321	(tosh_bios & 0xff00)>>8,
322	tosh_bios & 0xff,
323	tosh_date,
324	key);
325
326	return temp-buffer;
327	}
328	#endif
329
330
331	/*
332	* Determine which port to use for the Fn key status
333	*/
334	static void tosh_set_fn_port(void)
335	{
336	switch (tosh_id) {
337	case 0xfc02: case 0xfc04: case 0xfc09: case 0xfc0a: case 0xfc10:
338	case 0xfc11: case 0xfc13: case 0xfc15: case 0xfc1a: case 0xfc1b:
339	case 0xfc5a:
340	tosh_fn = 0x62;
341	break;
342	case 0xfc08: case 0xfc17: case 0xfc1d: case 0xfcd1: case 0xfce0:
343	case 0xfce2:
344	tosh_fn = 0x68;
345	break;
346	default:
347	tosh_fn = 0x00;
348	break;
349	}
350
351	return;
352	}
353
354
355	/*
356	* Get the machine identification number of the current model
357	*/
ef5a4c8b	358	static int tosh_get_machine_id(void __iomem *bios)
1da177e4 LT	359	{
	360	int id;
	361	SMMRegisters regs;
	362	unsigned short bx,cx;
	363	unsigned long address;
	364
ef5a4c8b	365	id = (0x100*(int) readb(bios+0xfffe))+((int) readb(bios+0xfffa));
3f5f7e2e	366
1da177e4 LT	367	/* do we have a SCTTable machine identication number on our hands */
	368
	369	if (id==0xfc2f) {
	370
	371	/* start by getting a pointer into the BIOS */
	372
	373	regs.eax = 0xc000;
	374	regs.ebx = 0x0000;
	375	regs.ecx = 0x0000;
	376	tosh_smm(&regs);
	377	bx = (unsigned short) (regs.ebx & 0xffff);
	378
	379	/* At this point in the Toshiba routines under MS Windows
	380	the bx register holds 0xe6f5. However my code is producing
	381	a different value! For the time being I will just fudge the
	382	value. This has been verified on a Satellite Pro 430CDT,
	383	Tecra 750CDT, Tecra 780DVD and Satellite 310CDT. */
	384	#if TOSH_DEBUG
	385	printk("toshiba: debugging ID ebx=0x%04x\n", regs.ebx);
	386	#endif
	387	bx = 0xe6f5;
	388
	389	/* now twiddle with our pointer a bit */
	390
ef5a4c8b AV	391	address = bx;
	392	cx = readw(bios + address);
	393	address = 9+bx+cx;
	394	cx = readw(bios + address);
	395	address = 0xa+cx;
	396	cx = readw(bios + address);
1da177e4 LT	397
	398	/* now construct our machine identification number */
	399
	400	id = ((cx & 0xff)<<8)+((cx & 0xff00)>>8);
	401	}
	402
	403	return id;
	404	}
	405
	406
	407	/*
	408	* Probe for the presence of a Toshiba laptop
	409	*
	410	* returns and non-zero if unable to detect the presence of a Toshiba
	411	* laptop, otherwise zero and determines the Machine ID, BIOS version and
	412	* date, and SCI version.
	413	*/
	414	static int tosh_probe(void)
	415	{
	416	int i,major,minor,day,year,month,flag;
	417	unsigned char signature[7] = { 0x54,0x4f,0x53,0x48,0x49,0x42,0x41 };
	418	SMMRegisters regs;
ef5a4c8b AV	419	void __iomem *bios = ioremap(0xf0000, 0x10000);
	420
	421	if (!bios)
	422	return -ENOMEM;
1da177e4 LT	423
	424	/* extra sanity check for the string "TOSHIBA" in the BIOS because
	425	some machines that are not Toshiba's pass the next test */
	426
	427	for (i=0;i<7;i++) {
ef5a4c8b	428	if (readb(bios+0xe010+i)!=signature[i]) {
1da177e4	429	printk("toshiba: not a supported Toshiba laptop\n");
ef5a4c8b	430	iounmap(bios);
1da177e4 LT	431	return -ENODEV;
	432	}
	433	}
	434
	435	/* call the Toshiba SCI support check routine */
3f5f7e2e	436
1da177e4 LT	437	regs.eax = 0xf0f0;
	438	regs.ebx = 0x0000;
	439	regs.ecx = 0x0000;
	440	flag = tosh_smm(&regs);
	441
	442	/* if this is not a Toshiba laptop carry flag is set and ah=0x86 */
	443
	444	if ((flag==1) \|\| ((regs.eax & 0xff00)==0x8600)) {
	445	printk("toshiba: not a supported Toshiba laptop\n");
ef5a4c8b	446	iounmap(bios);
1da177e4 LT	447	return -ENODEV;
	448	}
	449
	450	/* if we get this far then we are running on a Toshiba (probably)! */
	451
	452	tosh_sci = regs.edx & 0xffff;
3f5f7e2e	453
1da177e4 LT	454	/* next get the machine ID of the current laptop */
1da177e4 LT	455
ef5a4c8b	456	tosh_id = tosh_get_machine_id(bios);
1da177e4 LT	457
	458	/* get the BIOS version */
	459
ef5a4c8b AV	460	major = readb(bios+0xe009)-'0';
ef5a4c8b AV	461	minor = ((readb(bios+0xe00b)-'0')*10)+(readb(bios+0xe00c)-'0');
1da177e4 LT	462	tosh_bios = (major*0x100)+minor;
	463
	464	/* get the BIOS date */
	465
ef5a4c8b AV	466	day = ((readb(bios+0xfff5)-'0')*10)+(readb(bios+0xfff6)-'0');
	467	month = ((readb(bios+0xfff8)-'0')*10)+(readb(bios+0xfff9)-'0');
	468	year = ((readb(bios+0xfffb)-'0')*10)+(readb(bios+0xfffc)-'0');
1da177e4 LT	469	tosh_date = (((year-90) & 0x1f)<<10) \| ((month & 0xf)<<6)
	470	\| ((day & 0x1f)<<1);
	471
	472
	473	/* in theory we should check the ports we are going to use for the
	474	fn key detection (and the fan on the Portage 610/Tecra700), and
	475	then request them to stop other drivers using them. However as
	476	the keyboard driver grabs 0x60-0x6f and the pic driver grabs
	477	0xa0-0xbf we can't. We just have to live dangerously and use the
	478	ports anyway, oh boy! */
	479
	480	/* do we need to emulate the fan? */
	481
	482	if ((tosh_id==0xfccb) \|\| (tosh_id==0xfccc))
	483	tosh_fan = 1;
	484
ef5a4c8b AV	485	iounmap(bios);
ef5a4c8b AV	486
1da177e4 LT	487	return 0;
	488	}
	489
3f5f7e2e	490	static int __init toshiba_init(void)
1da177e4 LT	491	{
	492	int retval;
	493	/* are we running on a Toshiba laptop */
	494
3f5f7e2e DT	495	if (tosh_probe())
3f5f7e2e DT	496	return -ENODEV;
1da177e4	497
3f5f7e2e	498	printk(KERN_INFO "Toshiba System Managment Mode driver v" TOSH_VERSION "\n");
1da177e4 LT	499
	500	/* set the port to use for Fn status if not specified as a parameter */
	501	if (tosh_fn==0x00)
	502	tosh_set_fn_port();
	503
	504	/* register the device file */
	505	retval = misc_register(&tosh_device);
3f5f7e2e	506	if (retval < 0)
1da177e4 LT	507	return retval;
	508
	509	#ifdef CONFIG_PROC_FS
	510	/* register the proc entry */
3f5f7e2e	511	if (create_proc_info_entry("toshiba", 0, NULL, tosh_get_info) == NULL) {
1da177e4 LT	512	misc_deregister(&tosh_device);
	513	return -ENOMEM;
	514	}
	515	#endif
	516
	517	return 0;
	518	}
	519
3f5f7e2e	520	static void __exit toshiba_exit(void)
1da177e4	521	{
1da177e4	522	remove_proc_entry("toshiba", NULL);
1da177e4 LT	523	misc_deregister(&tosh_device);
1da177e4 LT	524	}
1da177e4	525
3f5f7e2e DT	526	module_init(toshiba_init);
3f5f7e2e DT	527	module_exit(toshiba_exit);
1da177e4	528