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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
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
64#define TOSH_MINOR_DEV 181
65
66MODULE_LICENSE("GPL");
67MODULE_AUTHOR("Jonathan Buzzard <jonathan@buzzard.org.uk>");
68MODULE_DESCRIPTION("Toshiba laptop SMM driver");
69MODULE_SUPPORTED_DEVICE("toshiba");
70
71static DEFINE_MUTEX(tosh_mutex);
72static int tosh_fn;
73module_param_named(fn, tosh_fn, int, 0);
74MODULE_PARM_DESC(fn, "User specified Fn key detection port");
75
76static int tosh_id;
77static int tosh_bios;
78static int tosh_date;
79static int tosh_sci;
80static int tosh_fan;
81
82static long tosh_ioctl(struct file *, unsigned int,
83 unsigned long);
84
85
86static const struct file_operations tosh_fops = {
87 .owner = THIS_MODULE,
88 .unlocked_ioctl = tosh_ioctl,
89 .llseek = noop_llseek,
90};
91
92static struct miscdevice tosh_device = {
93 TOSH_MINOR_DEV,
94 "toshiba",
95 &tosh_fops
96};
97
98/*
99 * Read the Fn key status
100 */
101#ifdef CONFIG_PROC_FS
102static int tosh_fn_status(void)
103{
104 unsigned char scan;
105 unsigned long flags;
106
107 if (tosh_fn!=0) {
108 scan = inb(tosh_fn);
109 } else {
110 local_irq_save(flags);
111 outb(0x8e, 0xe4);
112 scan = inb(0xe5);
113 local_irq_restore(flags);
114 }
115
116 return (int) scan;
117}
118#endif
119
120
121/*
122 * For the Portage 610CT and the Tecra 700CS/700CDT emulate the HCI fan function
123 */
124static int tosh_emulate_fan(SMMRegisters *regs)
125{
126 unsigned long eax,ecx,flags;
127 unsigned char al;
128
129 eax = regs->eax & 0xff00;
130 ecx = regs->ecx & 0xffff;
131
132 /* Portage 610CT */
133
134 if (tosh_id==0xfccb) {
135 if (eax==0xfe00) {
136 /* fan status */
137 local_irq_save(flags);
138 outb(0xbe, 0xe4);
139 al = inb(0xe5);
140 local_irq_restore(flags);
141 regs->eax = 0x00;
142 regs->ecx = (unsigned int) (al & 0x01);
143 }
144 if ((eax==0xff00) && (ecx==0x0000)) {
145 /* fan off */
146 local_irq_save(flags);
147 outb(0xbe, 0xe4);
148 al = inb(0xe5);
149 outb(0xbe, 0xe4);
150 outb (al | 0x01, 0xe5);
151 local_irq_restore(flags);
152 regs->eax = 0x00;
153 regs->ecx = 0x00;
154 }
155 if ((eax==0xff00) && (ecx==0x0001)) {
156 /* fan on */
157 local_irq_save(flags);
158 outb(0xbe, 0xe4);
159 al = inb(0xe5);
160 outb(0xbe, 0xe4);
161 outb(al & 0xfe, 0xe5);
162 local_irq_restore(flags);
163 regs->eax = 0x00;
164 regs->ecx = 0x01;
165 }
166 }
167
168 /* Tecra 700CS/CDT */
169
170 if (tosh_id==0xfccc) {
171 if (eax==0xfe00) {
172 /* fan status */
173 local_irq_save(flags);
174 outb(0xe0, 0xe4);
175 al = inb(0xe5);
176 local_irq_restore(flags);
177 regs->eax = 0x00;
178 regs->ecx = al & 0x01;
179 }
180 if ((eax==0xff00) && (ecx==0x0000)) {
181 /* fan off */
182 local_irq_save(flags);
183 outb(0xe0, 0xe4);
184 al = inb(0xe5);
185 outw(0xe0 | ((al & 0xfe) << 8), 0xe4);
186 local_irq_restore(flags);
187 regs->eax = 0x00;
188 regs->ecx = 0x00;
189 }
190 if ((eax==0xff00) && (ecx==0x0001)) {
191 /* fan on */
192 local_irq_save(flags);
193 outb(0xe0, 0xe4);
194 al = inb(0xe5);
195 outw(0xe0 | ((al | 0x01) << 8), 0xe4);
196 local_irq_restore(flags);
197 regs->eax = 0x00;
198 regs->ecx = 0x01;
199 }
200 }
201
202 return 0;
203}
204
205
206/*
207 * Put the laptop into System Management Mode
208 */
209int tosh_smm(SMMRegisters *regs)
210{
211 int eax;
212
213 asm ("# load the values into the registers\n\t" \
214 "pushl %%eax\n\t" \
215 "movl 0(%%eax),%%edx\n\t" \
216 "push %%edx\n\t" \
217 "movl 4(%%eax),%%ebx\n\t" \
218 "movl 8(%%eax),%%ecx\n\t" \
219 "movl 12(%%eax),%%edx\n\t" \
220 "movl 16(%%eax),%%esi\n\t" \
221 "movl 20(%%eax),%%edi\n\t" \
222 "popl %%eax\n\t" \
223 "# call the System Management mode\n\t" \
224 "inb $0xb2,%%al\n\t"
225 "# fill out the memory with the values in the registers\n\t" \
226 "xchgl %%eax,(%%esp)\n\t"
227 "movl %%ebx,4(%%eax)\n\t" \
228 "movl %%ecx,8(%%eax)\n\t" \
229 "movl %%edx,12(%%eax)\n\t" \
230 "movl %%esi,16(%%eax)\n\t" \
231 "movl %%edi,20(%%eax)\n\t" \
232 "popl %%edx\n\t" \
233 "movl %%edx,0(%%eax)\n\t" \
234 "# setup the return value to the carry flag\n\t" \
235 "lahf\n\t" \
236 "shrl $8,%%eax\n\t" \
237 "andl $1,%%eax\n" \
238 : "=a" (eax)
239 : "a" (regs)
240 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
241
242 return eax;
243}
244EXPORT_SYMBOL(tosh_smm);
245
246
247static long tosh_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
248{
249 SMMRegisters regs;
250 SMMRegisters __user *argp = (SMMRegisters __user *)arg;
251 unsigned short ax,bx;
252 int err;
253
254 if (!argp)
255 return -EINVAL;
256
257 if (copy_from_user(®s, argp, sizeof(SMMRegisters)))
258 return -EFAULT;
259
260 switch (cmd) {
261 case TOSH_SMM:
262 ax = regs.eax & 0xff00;
263 bx = regs.ebx & 0xffff;
264 /* block HCI calls to read/write memory & PCI devices */
265 if (((ax==0xff00) || (ax==0xfe00)) && (bx>0x0069))
266 return -EINVAL;
267
268 /* do we need to emulate the fan ? */
269 mutex_lock(&tosh_mutex);
270 if (tosh_fan==1) {
271 if (((ax==0xf300) || (ax==0xf400)) && (bx==0x0004)) {
272 err = tosh_emulate_fan(®s);
273 mutex_unlock(&tosh_mutex);
274 break;
275 }
276 }
277 err = tosh_smm(®s);
278 mutex_unlock(&tosh_mutex);
279 break;
280 default:
281 return -EINVAL;
282 }
283
284 if (copy_to_user(argp, ®s, sizeof(SMMRegisters)))
285 return -EFAULT;
286
287 return (err==0) ? 0:-EINVAL;
288}
289
290
291/*
292 * Print the information for /proc/toshiba
293 */
294#ifdef CONFIG_PROC_FS
295static int proc_toshiba_show(struct seq_file *m, void *v)
296{
297 int key;
298
299 key = tosh_fn_status();
300
301 /* Arguments
302 0) Linux driver version (this will change if format changes)
303 1) Machine ID
304 2) SCI version
305 3) BIOS version (major, minor)
306 4) BIOS date (in SCI date format)
307 5) Fn Key status
308 */
309 seq_printf(m, "1.1 0x%04x %d.%d %d.%d 0x%04x 0x%02x\n",
310 tosh_id,
311 (tosh_sci & 0xff00)>>8,
312 tosh_sci & 0xff,
313 (tosh_bios & 0xff00)>>8,
314 tosh_bios & 0xff,
315 tosh_date,
316 key);
317 return 0;
318}
319#endif
320
321
322/*
323 * Determine which port to use for the Fn key status
324 */
325static void tosh_set_fn_port(void)
326{
327 switch (tosh_id) {
328 case 0xfc02: case 0xfc04: case 0xfc09: case 0xfc0a: case 0xfc10:
329 case 0xfc11: case 0xfc13: case 0xfc15: case 0xfc1a: case 0xfc1b:
330 case 0xfc5a:
331 tosh_fn = 0x62;
332 break;
333 case 0xfc08: case 0xfc17: case 0xfc1d: case 0xfcd1: case 0xfce0:
334 case 0xfce2:
335 tosh_fn = 0x68;
336 break;
337 default:
338 tosh_fn = 0x00;
339 break;
340 }
341
342 return;
343}
344
345
346/*
347 * Get the machine identification number of the current model
348 */
349static int tosh_get_machine_id(void __iomem *bios)
350{
351 int id;
352 SMMRegisters regs;
353 unsigned short bx,cx;
354 unsigned long address;
355
356 id = (0x100*(int) readb(bios+0xfffe))+((int) readb(bios+0xfffa));
357
358 /* do we have a SCTTable machine identication number on our hands */
359
360 if (id==0xfc2f) {
361
362 /* start by getting a pointer into the BIOS */
363
364 regs.eax = 0xc000;
365 regs.ebx = 0x0000;
366 regs.ecx = 0x0000;
367 tosh_smm(®s);
368 bx = (unsigned short) (regs.ebx & 0xffff);
369
370 /* At this point in the Toshiba routines under MS Windows
371 the bx register holds 0xe6f5. However my code is producing
372 a different value! For the time being I will just fudge the
373 value. This has been verified on a Satellite Pro 430CDT,
374 Tecra 750CDT, Tecra 780DVD and Satellite 310CDT. */
375#if TOSH_DEBUG
376 pr_debug("toshiba: debugging ID ebx=0x%04x\n", regs.ebx);
377#endif
378 bx = 0xe6f5;
379
380 /* now twiddle with our pointer a bit */
381
382 address = bx;
383 cx = readw(bios + address);
384 address = 9+bx+cx;
385 cx = readw(bios + address);
386 address = 0xa+cx;
387 cx = readw(bios + address);
388
389 /* now construct our machine identification number */
390
391 id = ((cx & 0xff)<<8)+((cx & 0xff00)>>8);
392 }
393
394 return id;
395}
396
397
398/*
399 * Probe for the presence of a Toshiba laptop
400 *
401 * returns and non-zero if unable to detect the presence of a Toshiba
402 * laptop, otherwise zero and determines the Machine ID, BIOS version and
403 * date, and SCI version.
404 */
405static int tosh_probe(void)
406{
407 int i,major,minor,day,year,month,flag;
408 unsigned char signature[7] = { 0x54,0x4f,0x53,0x48,0x49,0x42,0x41 };
409 SMMRegisters regs;
410 void __iomem *bios = ioremap(0xf0000, 0x10000);
411
412 if (!bios)
413 return -ENOMEM;
414
415 /* extra sanity check for the string "TOSHIBA" in the BIOS because
416 some machines that are not Toshiba's pass the next test */
417
418 for (i=0;i<7;i++) {
419 if (readb(bios+0xe010+i)!=signature[i]) {
420 pr_err("toshiba: not a supported Toshiba laptop\n");
421 iounmap(bios);
422 return -ENODEV;
423 }
424 }
425
426 /* call the Toshiba SCI support check routine */
427
428 regs.eax = 0xf0f0;
429 regs.ebx = 0x0000;
430 regs.ecx = 0x0000;
431 flag = tosh_smm(®s);
432
433 /* if this is not a Toshiba laptop carry flag is set and ah=0x86 */
434
435 if ((flag==1) || ((regs.eax & 0xff00)==0x8600)) {
436 pr_err("toshiba: not a supported Toshiba laptop\n");
437 iounmap(bios);
438 return -ENODEV;
439 }
440
441 /* if we get this far then we are running on a Toshiba (probably)! */
442
443 tosh_sci = regs.edx & 0xffff;
444
445 /* next get the machine ID of the current laptop */
446
447 tosh_id = tosh_get_machine_id(bios);
448
449 /* get the BIOS version */
450
451 major = readb(bios+0xe009)-'0';
452 minor = ((readb(bios+0xe00b)-'0')*10)+(readb(bios+0xe00c)-'0');
453 tosh_bios = (major*0x100)+minor;
454
455 /* get the BIOS date */
456
457 day = ((readb(bios+0xfff5)-'0')*10)+(readb(bios+0xfff6)-'0');
458 month = ((readb(bios+0xfff8)-'0')*10)+(readb(bios+0xfff9)-'0');
459 year = ((readb(bios+0xfffb)-'0')*10)+(readb(bios+0xfffc)-'0');
460 tosh_date = (((year-90) & 0x1f)<<10) | ((month & 0xf)<<6)
461 | ((day & 0x1f)<<1);
462
463
464 /* in theory we should check the ports we are going to use for the
465 fn key detection (and the fan on the Portage 610/Tecra700), and
466 then request them to stop other drivers using them. However as
467 the keyboard driver grabs 0x60-0x6f and the pic driver grabs
468 0xa0-0xbf we can't. We just have to live dangerously and use the
469 ports anyway, oh boy! */
470
471 /* do we need to emulate the fan? */
472
473 if ((tosh_id==0xfccb) || (tosh_id==0xfccc))
474 tosh_fan = 1;
475
476 iounmap(bios);
477
478 return 0;
479}
480
481static int __init toshiba_init(void)
482{
483 int retval;
484 /* are we running on a Toshiba laptop */
485
486 if (tosh_probe())
487 return -ENODEV;
488
489 pr_info("Toshiba System Management Mode driver v" TOSH_VERSION "\n");
490
491 /* set the port to use for Fn status if not specified as a parameter */
492 if (tosh_fn==0x00)
493 tosh_set_fn_port();
494
495 /* register the device file */
496 retval = misc_register(&tosh_device);
497 if (retval < 0)
498 return retval;
499
500#ifdef CONFIG_PROC_FS
501 {
502 struct proc_dir_entry *pde;
503
504 pde = proc_create_single("toshiba", 0, NULL, proc_toshiba_show);
505 if (!pde) {
506 misc_deregister(&tosh_device);
507 return -ENOMEM;
508 }
509 }
510#endif
511
512 return 0;
513}
514
515static void __exit toshiba_exit(void)
516{
517 remove_proc_entry("toshiba", NULL);
518 misc_deregister(&tosh_device);
519}
520
521module_init(toshiba_init);
522module_exit(toshiba_exit);
523