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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* toshiba.c -- Linux driver for accessing the SMM on Toshiba laptops
3 *
4 * Copyright (c) 1996-2001 Jonathan A. Buzzard (jonathan@buzzard.org.uk)
5 *
6 * Valuable assistance and patches from:
7 * Tom May <tom@you-bastards.com>
8 * Rob Napier <rnapier@employees.org>
9 *
10 * Fn status port numbers for machine ID's courtesy of
11 * 0xfc02: Scott Eisert <scott.e@sky-eye.com>
12 * 0xfc04: Steve VanDevender <stevev@efn.org>
13 * 0xfc08: Garth Berry <garth@itsbruce.net>
14 * 0xfc0a: Egbert Eich <eich@xfree86.org>
15 * 0xfc10: Andrew Lofthouse <Andrew.Lofthouse@robins.af.mil>
16 * 0xfc11: Spencer Olson <solson@novell.com>
17 * 0xfc13: Claudius Frankewitz <kryp@gmx.de>
18 * 0xfc15: Tom May <tom@you-bastards.com>
19 * 0xfc17: Dave Konrad <konrad@xenia.it>
20 * 0xfc1a: George Betzos <betzos@engr.colostate.edu>
21 * 0xfc1b: Munemasa Wada <munemasa@jnovel.co.jp>
22 * 0xfc1d: Arthur Liu <armie@slap.mine.nu>
23 * 0xfc5a: Jacques L'helgoualc'h <lhh@free.fr>
24 * 0xfcd1: Mr. Dave Konrad <konrad@xenia.it>
25 *
26 * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
27 *
28 * This code is covered by the GNU GPL and you are free to make any
29 * changes you wish to it under the terms of the license. However the
30 * code has the potential to render your computer and/or someone else's
31 * unusable. Please proceed with care when modifying the code.
32 *
33 * Note: Unfortunately the laptop hardware can close the System Configuration
34 * Interface on it's own accord. It is therefore necessary for *all*
35 * programs using this driver to be aware that *any* SCI call can fail at
36 * *any* time. It is up to any program to be aware of this eventuality
37 * and take appropriate steps.
38 *
39 * The information used to write this driver has been obtained by reverse
40 * engineering the software supplied by Toshiba for their portable computers in
41 * strict accordance with the European Council Directive 92/250/EEC on the legal
42 * protection of computer programs, and it's implementation into English Law by
43 * the Copyright (Computer Programs) Regulations 1992 (S.I. 1992 No.3233).
44 */
45
46#define TOSH_VERSION "1.11 26/9/2001"
47#define TOSH_DEBUG 0
48
49#include <linux/module.h>
50#include <linux/kernel.h>
51#include <linux/types.h>
52#include <linux/fcntl.h>
53#include <linux/miscdevice.h>
54#include <linux/ioport.h>
55#include <asm/io.h>
56#include <linux/uaccess.h>
57#include <linux/init.h>
58#include <linux/stat.h>
59#include <linux/proc_fs.h>
60#include <linux/seq_file.h>
61#include <linux/mutex.h>
62#include <linux/toshiba.h>
63
64MODULE_LICENSE("GPL");
65MODULE_AUTHOR("Jonathan Buzzard <jonathan@buzzard.org.uk>");
66MODULE_DESCRIPTION("Toshiba laptop SMM driver");
67MODULE_SUPPORTED_DEVICE("toshiba");
68
69static DEFINE_MUTEX(tosh_mutex);
70static int tosh_fn;
71module_param_named(fn, tosh_fn, int, 0);
72MODULE_PARM_DESC(fn, "User specified Fn key detection port");
73
74static int tosh_id;
75static int tosh_bios;
76static int tosh_date;
77static int tosh_sci;
78static int tosh_fan;
79
80static long tosh_ioctl(struct file *, unsigned int,
81 unsigned long);
82
83
84static const struct file_operations tosh_fops = {
85 .owner = THIS_MODULE,
86 .unlocked_ioctl = tosh_ioctl,
87 .llseek = noop_llseek,
88};
89
90static struct miscdevice tosh_device = {
91 TOSH_MINOR_DEV,
92 "toshiba",
93 &tosh_fops
94};
95
96/*
97 * Read the Fn key status
98 */
99#ifdef CONFIG_PROC_FS
100static int tosh_fn_status(void)
101{
102 unsigned char scan;
103 unsigned long flags;
104
105 if (tosh_fn!=0) {
106 scan = inb(tosh_fn);
107 } else {
108 local_irq_save(flags);
109 outb(0x8e, 0xe4);
110 scan = inb(0xe5);
111 local_irq_restore(flags);
112 }
113
114 return (int) scan;
115}
116#endif
117
118
119/*
120 * For the Portage 610CT and the Tecra 700CS/700CDT emulate the HCI fan function
121 */
122static int tosh_emulate_fan(SMMRegisters *regs)
123{
124 unsigned long eax,ecx,flags;
125 unsigned char al;
126
127 eax = regs->eax & 0xff00;
128 ecx = regs->ecx & 0xffff;
129
130 /* Portage 610CT */
131
132 if (tosh_id==0xfccb) {
133 if (eax==0xfe00) {
134 /* fan status */
135 local_irq_save(flags);
136 outb(0xbe, 0xe4);
137 al = inb(0xe5);
138 local_irq_restore(flags);
139 regs->eax = 0x00;
140 regs->ecx = (unsigned int) (al & 0x01);
141 }
142 if ((eax==0xff00) && (ecx==0x0000)) {
143 /* fan off */
144 local_irq_save(flags);
145 outb(0xbe, 0xe4);
146 al = inb(0xe5);
147 outb(0xbe, 0xe4);
148 outb (al | 0x01, 0xe5);
149 local_irq_restore(flags);
150 regs->eax = 0x00;
151 regs->ecx = 0x00;
152 }
153 if ((eax==0xff00) && (ecx==0x0001)) {
154 /* fan on */
155 local_irq_save(flags);
156 outb(0xbe, 0xe4);
157 al = inb(0xe5);
158 outb(0xbe, 0xe4);
159 outb(al & 0xfe, 0xe5);
160 local_irq_restore(flags);
161 regs->eax = 0x00;
162 regs->ecx = 0x01;
163 }
164 }
165
166 /* Tecra 700CS/CDT */
167
168 if (tosh_id==0xfccc) {
169 if (eax==0xfe00) {
170 /* fan status */
171 local_irq_save(flags);
172 outb(0xe0, 0xe4);
173 al = inb(0xe5);
174 local_irq_restore(flags);
175 regs->eax = 0x00;
176 regs->ecx = al & 0x01;
177 }
178 if ((eax==0xff00) && (ecx==0x0000)) {
179 /* fan off */
180 local_irq_save(flags);
181 outb(0xe0, 0xe4);
182 al = inb(0xe5);
183 outw(0xe0 | ((al & 0xfe) << 8), 0xe4);
184 local_irq_restore(flags);
185 regs->eax = 0x00;
186 regs->ecx = 0x00;
187 }
188 if ((eax==0xff00) && (ecx==0x0001)) {
189 /* fan on */
190 local_irq_save(flags);
191 outb(0xe0, 0xe4);
192 al = inb(0xe5);
193 outw(0xe0 | ((al | 0x01) << 8), 0xe4);
194 local_irq_restore(flags);
195 regs->eax = 0x00;
196 regs->ecx = 0x01;
197 }
198 }
199
200 return 0;
201}
202
203
204/*
205 * Put the laptop into System Management Mode
206 */
207int tosh_smm(SMMRegisters *regs)
208{
209 int eax;
210
211 asm ("# load the values into the registers\n\t" \
212 "pushl %%eax\n\t" \
213 "movl 0(%%eax),%%edx\n\t" \
214 "push %%edx\n\t" \
215 "movl 4(%%eax),%%ebx\n\t" \
216 "movl 8(%%eax),%%ecx\n\t" \
217 "movl 12(%%eax),%%edx\n\t" \
218 "movl 16(%%eax),%%esi\n\t" \
219 "movl 20(%%eax),%%edi\n\t" \
220 "popl %%eax\n\t" \
221 "# call the System Management mode\n\t" \
222 "inb $0xb2,%%al\n\t"
223 "# fill out the memory with the values in the registers\n\t" \
224 "xchgl %%eax,(%%esp)\n\t"
225 "movl %%ebx,4(%%eax)\n\t" \
226 "movl %%ecx,8(%%eax)\n\t" \
227 "movl %%edx,12(%%eax)\n\t" \
228 "movl %%esi,16(%%eax)\n\t" \
229 "movl %%edi,20(%%eax)\n\t" \
230 "popl %%edx\n\t" \
231 "movl %%edx,0(%%eax)\n\t" \
232 "# setup the return value to the carry flag\n\t" \
233 "lahf\n\t" \
234 "shrl $8,%%eax\n\t" \
235 "andl $1,%%eax\n" \
236 : "=a" (eax)
237 : "a" (regs)
238 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
239
240 return eax;
241}
242EXPORT_SYMBOL(tosh_smm);
243
244
245static long tosh_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
246{
247 SMMRegisters regs;
248 SMMRegisters __user *argp = (SMMRegisters __user *)arg;
249 unsigned short ax,bx;
250 int err;
251
252 if (!argp)
253 return -EINVAL;
254
255 if (copy_from_user(®s, argp, sizeof(SMMRegisters)))
256 return -EFAULT;
257
258 switch (cmd) {
259 case TOSH_SMM:
260 ax = regs.eax & 0xff00;
261 bx = regs.ebx & 0xffff;
262 /* block HCI calls to read/write memory & PCI devices */
263 if (((ax==0xff00) || (ax==0xfe00)) && (bx>0x0069))
264 return -EINVAL;
265
266 /* do we need to emulate the fan ? */
267 mutex_lock(&tosh_mutex);
268 if (tosh_fan==1) {
269 if (((ax==0xf300) || (ax==0xf400)) && (bx==0x0004)) {
270 err = tosh_emulate_fan(®s);
271 mutex_unlock(&tosh_mutex);
272 break;
273 }
274 }
275 err = tosh_smm(®s);
276 mutex_unlock(&tosh_mutex);
277 break;
278 default:
279 return -EINVAL;
280 }
281
282 if (copy_to_user(argp, ®s, sizeof(SMMRegisters)))
283 return -EFAULT;
284
285 return (err==0) ? 0:-EINVAL;
286}
287
288
289/*
290 * Print the information for /proc/toshiba
291 */
292#ifdef CONFIG_PROC_FS
293static int proc_toshiba_show(struct seq_file *m, void *v)
294{
295 int key;
296
297 key = tosh_fn_status();
298
299 /* Arguments
300 0) Linux driver version (this will change if format changes)
301 1) Machine ID
302 2) SCI version
303 3) BIOS version (major, minor)
304 4) BIOS date (in SCI date format)
305 5) Fn Key status
306 */
307 seq_printf(m, "1.1 0x%04x %d.%d %d.%d 0x%04x 0x%02x\n",
308 tosh_id,
309 (tosh_sci & 0xff00)>>8,
310 tosh_sci & 0xff,
311 (tosh_bios & 0xff00)>>8,
312 tosh_bios & 0xff,
313 tosh_date,
314 key);
315 return 0;
316}
317#endif
318
319
320/*
321 * Determine which port to use for the Fn key status
322 */
323static void tosh_set_fn_port(void)
324{
325 switch (tosh_id) {
326 case 0xfc02: case 0xfc04: case 0xfc09: case 0xfc0a: case 0xfc10:
327 case 0xfc11: case 0xfc13: case 0xfc15: case 0xfc1a: case 0xfc1b:
328 case 0xfc5a:
329 tosh_fn = 0x62;
330 break;
331 case 0xfc08: case 0xfc17: case 0xfc1d: case 0xfcd1: case 0xfce0:
332 case 0xfce2:
333 tosh_fn = 0x68;
334 break;
335 default:
336 tosh_fn = 0x00;
337 break;
338 }
339
340 return;
341}
342
343
344/*
345 * Get the machine identification number of the current model
346 */
347static int tosh_get_machine_id(void __iomem *bios)
348{
349 int id;
350 SMMRegisters regs;
351 unsigned short bx,cx;
352 unsigned long address;
353
354 id = (0x100*(int) readb(bios+0xfffe))+((int) readb(bios+0xfffa));
355
356 /* do we have a SCTTable machine identication number on our hands */
357
358 if (id==0xfc2f) {
359
360 /* start by getting a pointer into the BIOS */
361
362 regs.eax = 0xc000;
363 regs.ebx = 0x0000;
364 regs.ecx = 0x0000;
365 tosh_smm(®s);
366 bx = (unsigned short) (regs.ebx & 0xffff);
367
368 /* At this point in the Toshiba routines under MS Windows
369 the bx register holds 0xe6f5. However my code is producing
370 a different value! For the time being I will just fudge the
371 value. This has been verified on a Satellite Pro 430CDT,
372 Tecra 750CDT, Tecra 780DVD and Satellite 310CDT. */
373#if TOSH_DEBUG
374 pr_debug("toshiba: debugging ID ebx=0x%04x\n", regs.ebx);
375#endif
376 bx = 0xe6f5;
377
378 /* now twiddle with our pointer a bit */
379
380 address = bx;
381 cx = readw(bios + address);
382 address = 9+bx+cx;
383 cx = readw(bios + address);
384 address = 0xa+cx;
385 cx = readw(bios + address);
386
387 /* now construct our machine identification number */
388
389 id = ((cx & 0xff)<<8)+((cx & 0xff00)>>8);
390 }
391
392 return id;
393}
394
395
396/*
397 * Probe for the presence of a Toshiba laptop
398 *
399 * returns and non-zero if unable to detect the presence of a Toshiba
400 * laptop, otherwise zero and determines the Machine ID, BIOS version and
401 * date, and SCI version.
402 */
403static int tosh_probe(void)
404{
405 int i,major,minor,day,year,month,flag;
406 unsigned char signature[7] = { 0x54,0x4f,0x53,0x48,0x49,0x42,0x41 };
407 SMMRegisters regs;
408 void __iomem *bios = ioremap(0xf0000, 0x10000);
409
410 if (!bios)
411 return -ENOMEM;
412
413 /* extra sanity check for the string "TOSHIBA" in the BIOS because
414 some machines that are not Toshiba's pass the next test */
415
416 for (i=0;i<7;i++) {
417 if (readb(bios+0xe010+i)!=signature[i]) {
418 pr_err("toshiba: not a supported Toshiba laptop\n");
419 iounmap(bios);
420 return -ENODEV;
421 }
422 }
423
424 /* call the Toshiba SCI support check routine */
425
426 regs.eax = 0xf0f0;
427 regs.ebx = 0x0000;
428 regs.ecx = 0x0000;
429 flag = tosh_smm(®s);
430
431 /* if this is not a Toshiba laptop carry flag is set and ah=0x86 */
432
433 if ((flag==1) || ((regs.eax & 0xff00)==0x8600)) {
434 pr_err("toshiba: not a supported Toshiba laptop\n");
435 iounmap(bios);
436 return -ENODEV;
437 }
438
439 /* if we get this far then we are running on a Toshiba (probably)! */
440
441 tosh_sci = regs.edx & 0xffff;
442
443 /* next get the machine ID of the current laptop */
444
445 tosh_id = tosh_get_machine_id(bios);
446
447 /* get the BIOS version */
448
449 major = readb(bios+0xe009)-'0';
450 minor = ((readb(bios+0xe00b)-'0')*10)+(readb(bios+0xe00c)-'0');
451 tosh_bios = (major*0x100)+minor;
452
453 /* get the BIOS date */
454
455 day = ((readb(bios+0xfff5)-'0')*10)+(readb(bios+0xfff6)-'0');
456 month = ((readb(bios+0xfff8)-'0')*10)+(readb(bios+0xfff9)-'0');
457 year = ((readb(bios+0xfffb)-'0')*10)+(readb(bios+0xfffc)-'0');
458 tosh_date = (((year-90) & 0x1f)<<10) | ((month & 0xf)<<6)
459 | ((day & 0x1f)<<1);
460
461
462 /* in theory we should check the ports we are going to use for the
463 fn key detection (and the fan on the Portage 610/Tecra700), and
464 then request them to stop other drivers using them. However as
465 the keyboard driver grabs 0x60-0x6f and the pic driver grabs
466 0xa0-0xbf we can't. We just have to live dangerously and use the
467 ports anyway, oh boy! */
468
469 /* do we need to emulate the fan? */
470
471 if ((tosh_id==0xfccb) || (tosh_id==0xfccc))
472 tosh_fan = 1;
473
474 iounmap(bios);
475
476 return 0;
477}
478
479static int __init toshiba_init(void)
480{
481 int retval;
482 /* are we running on a Toshiba laptop */
483
484 if (tosh_probe())
485 return -ENODEV;
486
487 pr_info("Toshiba System Management Mode driver v" TOSH_VERSION "\n");
488
489 /* set the port to use for Fn status if not specified as a parameter */
490 if (tosh_fn==0x00)
491 tosh_set_fn_port();
492
493 /* register the device file */
494 retval = misc_register(&tosh_device);
495 if (retval < 0)
496 return retval;
497
498#ifdef CONFIG_PROC_FS
499 {
500 struct proc_dir_entry *pde;
501
502 pde = proc_create_single("toshiba", 0, NULL, proc_toshiba_show);
503 if (!pde) {
504 misc_deregister(&tosh_device);
505 return -ENOMEM;
506 }
507 }
508#endif
509
510 return 0;
511}
512
513static void __exit toshiba_exit(void)
514{
515 remove_proc_entry("toshiba", NULL);
516 misc_deregister(&tosh_device);
517}
518
519module_init(toshiba_init);
520module_exit(toshiba_exit);
521
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/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>
70#include <linux/seq_file.h>
71#include <linux/mutex.h>
72#include <linux/toshiba.h>
73
74#define TOSH_MINOR_DEV 181
75
76MODULE_LICENSE("GPL");
77MODULE_AUTHOR("Jonathan Buzzard <jonathan@buzzard.org.uk>");
78MODULE_DESCRIPTION("Toshiba laptop SMM driver");
79MODULE_SUPPORTED_DEVICE("toshiba");
80
81static DEFINE_MUTEX(tosh_mutex);
82static int tosh_fn;
83module_param_named(fn, tosh_fn, int, 0);
84MODULE_PARM_DESC(fn, "User specified Fn key detection port");
85
86static int tosh_id;
87static int tosh_bios;
88static int tosh_date;
89static int tosh_sci;
90static int tosh_fan;
91
92static long tosh_ioctl(struct file *, unsigned int,
93 unsigned long);
94
95
96static const struct file_operations tosh_fops = {
97 .owner = THIS_MODULE,
98 .unlocked_ioctl = tosh_ioctl,
99 .llseek = noop_llseek,
100};
101
102static struct miscdevice tosh_device = {
103 TOSH_MINOR_DEV,
104 "toshiba",
105 &tosh_fops
106};
107
108/*
109 * Read the Fn key status
110 */
111#ifdef CONFIG_PROC_FS
112static int tosh_fn_status(void)
113{
114 unsigned char scan;
115 unsigned long flags;
116
117 if (tosh_fn!=0) {
118 scan = inb(tosh_fn);
119 } else {
120 local_irq_save(flags);
121 outb(0x8e, 0xe4);
122 scan = inb(0xe5);
123 local_irq_restore(flags);
124 }
125
126 return (int) scan;
127}
128#endif
129
130
131/*
132 * For the Portage 610CT and the Tecra 700CS/700CDT emulate the HCI fan function
133 */
134static int tosh_emulate_fan(SMMRegisters *regs)
135{
136 unsigned long eax,ecx,flags;
137 unsigned char al;
138
139 eax = regs->eax & 0xff00;
140 ecx = regs->ecx & 0xffff;
141
142 /* Portage 610CT */
143
144 if (tosh_id==0xfccb) {
145 if (eax==0xfe00) {
146 /* fan status */
147 local_irq_save(flags);
148 outb(0xbe, 0xe4);
149 al = inb(0xe5);
150 local_irq_restore(flags);
151 regs->eax = 0x00;
152 regs->ecx = (unsigned int) (al & 0x01);
153 }
154 if ((eax==0xff00) && (ecx==0x0000)) {
155 /* fan off */
156 local_irq_save(flags);
157 outb(0xbe, 0xe4);
158 al = inb(0xe5);
159 outb(0xbe, 0xe4);
160 outb (al | 0x01, 0xe5);
161 local_irq_restore(flags);
162 regs->eax = 0x00;
163 regs->ecx = 0x00;
164 }
165 if ((eax==0xff00) && (ecx==0x0001)) {
166 /* fan on */
167 local_irq_save(flags);
168 outb(0xbe, 0xe4);
169 al = inb(0xe5);
170 outb(0xbe, 0xe4);
171 outb(al & 0xfe, 0xe5);
172 local_irq_restore(flags);
173 regs->eax = 0x00;
174 regs->ecx = 0x01;
175 }
176 }
177
178 /* Tecra 700CS/CDT */
179
180 if (tosh_id==0xfccc) {
181 if (eax==0xfe00) {
182 /* fan status */
183 local_irq_save(flags);
184 outb(0xe0, 0xe4);
185 al = inb(0xe5);
186 local_irq_restore(flags);
187 regs->eax = 0x00;
188 regs->ecx = al & 0x01;
189 }
190 if ((eax==0xff00) && (ecx==0x0000)) {
191 /* fan off */
192 local_irq_save(flags);
193 outb(0xe0, 0xe4);
194 al = inb(0xe5);
195 outw(0xe0 | ((al & 0xfe) << 8), 0xe4);
196 local_irq_restore(flags);
197 regs->eax = 0x00;
198 regs->ecx = 0x00;
199 }
200 if ((eax==0xff00) && (ecx==0x0001)) {
201 /* fan on */
202 local_irq_save(flags);
203 outb(0xe0, 0xe4);
204 al = inb(0xe5);
205 outw(0xe0 | ((al | 0x01) << 8), 0xe4);
206 local_irq_restore(flags);
207 regs->eax = 0x00;
208 regs->ecx = 0x01;
209 }
210 }
211
212 return 0;
213}
214
215
216/*
217 * Put the laptop into System Management Mode
218 */
219int tosh_smm(SMMRegisters *regs)
220{
221 int eax;
222
223 asm ("# load the values into the registers\n\t" \
224 "pushl %%eax\n\t" \
225 "movl 0(%%eax),%%edx\n\t" \
226 "push %%edx\n\t" \
227 "movl 4(%%eax),%%ebx\n\t" \
228 "movl 8(%%eax),%%ecx\n\t" \
229 "movl 12(%%eax),%%edx\n\t" \
230 "movl 16(%%eax),%%esi\n\t" \
231 "movl 20(%%eax),%%edi\n\t" \
232 "popl %%eax\n\t" \
233 "# call the System Management mode\n\t" \
234 "inb $0xb2,%%al\n\t"
235 "# fill out the memory with the values in the registers\n\t" \
236 "xchgl %%eax,(%%esp)\n\t"
237 "movl %%ebx,4(%%eax)\n\t" \
238 "movl %%ecx,8(%%eax)\n\t" \
239 "movl %%edx,12(%%eax)\n\t" \
240 "movl %%esi,16(%%eax)\n\t" \
241 "movl %%edi,20(%%eax)\n\t" \
242 "popl %%edx\n\t" \
243 "movl %%edx,0(%%eax)\n\t" \
244 "# setup the return value to the carry flag\n\t" \
245 "lahf\n\t" \
246 "shrl $8,%%eax\n\t" \
247 "andl $1,%%eax\n" \
248 : "=a" (eax)
249 : "a" (regs)
250 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
251
252 return eax;
253}
254EXPORT_SYMBOL(tosh_smm);
255
256
257static long tosh_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
258{
259 SMMRegisters regs;
260 SMMRegisters __user *argp = (SMMRegisters __user *)arg;
261 unsigned short ax,bx;
262 int err;
263
264 if (!argp)
265 return -EINVAL;
266
267 if (copy_from_user(®s, argp, sizeof(SMMRegisters)))
268 return -EFAULT;
269
270 switch (cmd) {
271 case TOSH_SMM:
272 ax = regs.eax & 0xff00;
273 bx = regs.ebx & 0xffff;
274 /* block HCI calls to read/write memory & PCI devices */
275 if (((ax==0xff00) || (ax==0xfe00)) && (bx>0x0069))
276 return -EINVAL;
277
278 /* do we need to emulate the fan ? */
279 mutex_lock(&tosh_mutex);
280 if (tosh_fan==1) {
281 if (((ax==0xf300) || (ax==0xf400)) && (bx==0x0004)) {
282 err = tosh_emulate_fan(®s);
283 mutex_unlock(&tosh_mutex);
284 break;
285 }
286 }
287 err = tosh_smm(®s);
288 mutex_unlock(&tosh_mutex);
289 break;
290 default:
291 return -EINVAL;
292 }
293
294 if (copy_to_user(argp, ®s, sizeof(SMMRegisters)))
295 return -EFAULT;
296
297 return (err==0) ? 0:-EINVAL;
298}
299
300
301/*
302 * Print the information for /proc/toshiba
303 */
304#ifdef CONFIG_PROC_FS
305static int proc_toshiba_show(struct seq_file *m, void *v)
306{
307 int key;
308
309 key = tosh_fn_status();
310
311 /* Arguments
312 0) Linux driver version (this will change if format changes)
313 1) Machine ID
314 2) SCI version
315 3) BIOS version (major, minor)
316 4) BIOS date (in SCI date format)
317 5) Fn Key status
318 */
319 seq_printf(m, "1.1 0x%04x %d.%d %d.%d 0x%04x 0x%02x\n",
320 tosh_id,
321 (tosh_sci & 0xff00)>>8,
322 tosh_sci & 0xff,
323 (tosh_bios & 0xff00)>>8,
324 tosh_bios & 0xff,
325 tosh_date,
326 key);
327 return 0;
328}
329
330static int proc_toshiba_open(struct inode *inode, struct file *file)
331{
332 return single_open(file, proc_toshiba_show, NULL);
333}
334
335static const struct file_operations proc_toshiba_fops = {
336 .owner = THIS_MODULE,
337 .open = proc_toshiba_open,
338 .read = seq_read,
339 .llseek = seq_lseek,
340 .release = single_release,
341};
342#endif
343
344
345/*
346 * Determine which port to use for the Fn key status
347 */
348static void tosh_set_fn_port(void)
349{
350 switch (tosh_id) {
351 case 0xfc02: case 0xfc04: case 0xfc09: case 0xfc0a: case 0xfc10:
352 case 0xfc11: case 0xfc13: case 0xfc15: case 0xfc1a: case 0xfc1b:
353 case 0xfc5a:
354 tosh_fn = 0x62;
355 break;
356 case 0xfc08: case 0xfc17: case 0xfc1d: case 0xfcd1: case 0xfce0:
357 case 0xfce2:
358 tosh_fn = 0x68;
359 break;
360 default:
361 tosh_fn = 0x00;
362 break;
363 }
364
365 return;
366}
367
368
369/*
370 * Get the machine identification number of the current model
371 */
372static int tosh_get_machine_id(void __iomem *bios)
373{
374 int id;
375 SMMRegisters regs;
376 unsigned short bx,cx;
377 unsigned long address;
378
379 id = (0x100*(int) readb(bios+0xfffe))+((int) readb(bios+0xfffa));
380
381 /* do we have a SCTTable machine identication number on our hands */
382
383 if (id==0xfc2f) {
384
385 /* start by getting a pointer into the BIOS */
386
387 regs.eax = 0xc000;
388 regs.ebx = 0x0000;
389 regs.ecx = 0x0000;
390 tosh_smm(®s);
391 bx = (unsigned short) (regs.ebx & 0xffff);
392
393 /* At this point in the Toshiba routines under MS Windows
394 the bx register holds 0xe6f5. However my code is producing
395 a different value! For the time being I will just fudge the
396 value. This has been verified on a Satellite Pro 430CDT,
397 Tecra 750CDT, Tecra 780DVD and Satellite 310CDT. */
398#if TOSH_DEBUG
399 printk("toshiba: debugging ID ebx=0x%04x\n", regs.ebx);
400#endif
401 bx = 0xe6f5;
402
403 /* now twiddle with our pointer a bit */
404
405 address = bx;
406 cx = readw(bios + address);
407 address = 9+bx+cx;
408 cx = readw(bios + address);
409 address = 0xa+cx;
410 cx = readw(bios + address);
411
412 /* now construct our machine identification number */
413
414 id = ((cx & 0xff)<<8)+((cx & 0xff00)>>8);
415 }
416
417 return id;
418}
419
420
421/*
422 * Probe for the presence of a Toshiba laptop
423 *
424 * returns and non-zero if unable to detect the presence of a Toshiba
425 * laptop, otherwise zero and determines the Machine ID, BIOS version and
426 * date, and SCI version.
427 */
428static int tosh_probe(void)
429{
430 int i,major,minor,day,year,month,flag;
431 unsigned char signature[7] = { 0x54,0x4f,0x53,0x48,0x49,0x42,0x41 };
432 SMMRegisters regs;
433 void __iomem *bios = ioremap_cache(0xf0000, 0x10000);
434
435 if (!bios)
436 return -ENOMEM;
437
438 /* extra sanity check for the string "TOSHIBA" in the BIOS because
439 some machines that are not Toshiba's pass the next test */
440
441 for (i=0;i<7;i++) {
442 if (readb(bios+0xe010+i)!=signature[i]) {
443 printk("toshiba: not a supported Toshiba laptop\n");
444 iounmap(bios);
445 return -ENODEV;
446 }
447 }
448
449 /* call the Toshiba SCI support check routine */
450
451 regs.eax = 0xf0f0;
452 regs.ebx = 0x0000;
453 regs.ecx = 0x0000;
454 flag = tosh_smm(®s);
455
456 /* if this is not a Toshiba laptop carry flag is set and ah=0x86 */
457
458 if ((flag==1) || ((regs.eax & 0xff00)==0x8600)) {
459 printk("toshiba: not a supported Toshiba laptop\n");
460 iounmap(bios);
461 return -ENODEV;
462 }
463
464 /* if we get this far then we are running on a Toshiba (probably)! */
465
466 tosh_sci = regs.edx & 0xffff;
467
468 /* next get the machine ID of the current laptop */
469
470 tosh_id = tosh_get_machine_id(bios);
471
472 /* get the BIOS version */
473
474 major = readb(bios+0xe009)-'0';
475 minor = ((readb(bios+0xe00b)-'0')*10)+(readb(bios+0xe00c)-'0');
476 tosh_bios = (major*0x100)+minor;
477
478 /* get the BIOS date */
479
480 day = ((readb(bios+0xfff5)-'0')*10)+(readb(bios+0xfff6)-'0');
481 month = ((readb(bios+0xfff8)-'0')*10)+(readb(bios+0xfff9)-'0');
482 year = ((readb(bios+0xfffb)-'0')*10)+(readb(bios+0xfffc)-'0');
483 tosh_date = (((year-90) & 0x1f)<<10) | ((month & 0xf)<<6)
484 | ((day & 0x1f)<<1);
485
486
487 /* in theory we should check the ports we are going to use for the
488 fn key detection (and the fan on the Portage 610/Tecra700), and
489 then request them to stop other drivers using them. However as
490 the keyboard driver grabs 0x60-0x6f and the pic driver grabs
491 0xa0-0xbf we can't. We just have to live dangerously and use the
492 ports anyway, oh boy! */
493
494 /* do we need to emulate the fan? */
495
496 if ((tosh_id==0xfccb) || (tosh_id==0xfccc))
497 tosh_fan = 1;
498
499 iounmap(bios);
500
501 return 0;
502}
503
504static int __init toshiba_init(void)
505{
506 int retval;
507 /* are we running on a Toshiba laptop */
508
509 if (tosh_probe())
510 return -ENODEV;
511
512 printk(KERN_INFO "Toshiba System Management Mode driver v" TOSH_VERSION "\n");
513
514 /* set the port to use for Fn status if not specified as a parameter */
515 if (tosh_fn==0x00)
516 tosh_set_fn_port();
517
518 /* register the device file */
519 retval = misc_register(&tosh_device);
520 if (retval < 0)
521 return retval;
522
523#ifdef CONFIG_PROC_FS
524 {
525 struct proc_dir_entry *pde;
526
527 pde = proc_create("toshiba", 0, NULL, &proc_toshiba_fops);
528 if (!pde) {
529 misc_deregister(&tosh_device);
530 return -ENOMEM;
531 }
532 }
533#endif
534
535 return 0;
536}
537
538static void __exit toshiba_exit(void)
539{
540 remove_proc_entry("toshiba", NULL);
541 misc_deregister(&tosh_device);
542}
543
544module_init(toshiba_init);
545module_exit(toshiba_exit);
546