1 /*
2 * i8k.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
3 * See http://www.debian.org/~dz/i8k/ for more information
4 * and for latest version of this driver.
5 *
6 * Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2, or (at your option) any
11 * later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 */
18
19 #include <linux/module.h>
20 #include <linux/types.h>
21 #include <linux/init.h>
22 #include <linux/proc_fs.h>
23 #include <linux/seq_file.h>
24 #include <linux/dmi.h>
25 #include <linux/capability.h>
26 #include <asm/uaccess.h>
27 #include <asm/io.h>
28
29 #include <linux/i8k.h>
30
31 #define I8K_VERSION "1.14 21/02/2005"
32
33 #define I8K_SMM_FN_STATUS 0x0025
34 #define I8K_SMM_POWER_STATUS 0x0069
35 #define I8K_SMM_SET_FAN 0x01a3
36 #define I8K_SMM_GET_FAN 0x00a3
37 #define I8K_SMM_GET_SPEED 0x02a3
38 #define I8K_SMM_GET_TEMP 0x10a3
39 #define I8K_SMM_GET_DELL_SIG1 0xfea3
40 #define I8K_SMM_GET_DELL_SIG2 0xffa3
41 #define I8K_SMM_BIOS_VERSION 0x00a6
42
43 #define I8K_FAN_MULT 30
44 #define I8K_MAX_TEMP 127
45
46 #define I8K_FN_NONE 0x00
47 #define I8K_FN_UP 0x01
48 #define I8K_FN_DOWN 0x02
49 #define I8K_FN_MUTE 0x04
50 #define I8K_FN_MASK 0x07
51 #define I8K_FN_SHIFT 8
52
53 #define I8K_POWER_AC 0x05
54 #define I8K_POWER_BATTERY 0x01
55
56 #define I8K_TEMPERATURE_BUG 1
57
58 static char bios_version[4];
59
60 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
61 MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
62 MODULE_LICENSE("GPL");
63
64 static int force;
65 module_param(force, bool, 0);
66 MODULE_PARM_DESC(force, "Force loading without checking for supported models");
67
68 static int ignore_dmi;
69 module_param(ignore_dmi, bool, 0);
70 MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
71
72 static int restricted;
73 module_param(restricted, bool, 0);
74 MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
75
76 static int power_status;
77 module_param(power_status, bool, 0600);
78 MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
79
80 static int i8k_open_fs(struct inode *inode, struct file *file);
81 static int i8k_ioctl(struct inode *, struct file *, unsigned int,
82 unsigned long);
83
84 static const struct file_operations i8k_fops = {
85 .open = i8k_open_fs,
86 .read = seq_read,
87 .llseek = seq_lseek,
88 .release = single_release,
89 .ioctl = i8k_ioctl,
90 };
91
92 struct smm_regs {
93 unsigned int eax;
94 unsigned int ebx __attribute__ ((packed));
95 unsigned int ecx __attribute__ ((packed));
96 unsigned int edx __attribute__ ((packed));
97 unsigned int esi __attribute__ ((packed));
98 unsigned int edi __attribute__ ((packed));
99 };
100
101 static inline const char *i8k_get_dmi_data(int field)
102 {
103 const char *dmi_data = dmi_get_system_info(field);
104
105 return dmi_data && *dmi_data ? dmi_data : "?";
106 }
107
108 /*
109 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
110 */
111 static int i8k_smm(struct smm_regs *regs)
112 {
113 int rc;
114 int eax = regs->eax;
115
116 #if defined(CONFIG_X86_64)
117 asm("pushq %%rax\n\t"
118 "movl 0(%%rax),%%edx\n\t"
119 "pushq %%rdx\n\t"
120 "movl 4(%%rax),%%ebx\n\t"
121 "movl 8(%%rax),%%ecx\n\t"
122 "movl 12(%%rax),%%edx\n\t"
123 "movl 16(%%rax),%%esi\n\t"
124 "movl 20(%%rax),%%edi\n\t"
125 "popq %%rax\n\t"
126 "out %%al,$0xb2\n\t"
127 "out %%al,$0x84\n\t"
128 "xchgq %%rax,(%%rsp)\n\t"
129 "movl %%ebx,4(%%rax)\n\t"
130 "movl %%ecx,8(%%rax)\n\t"
131 "movl %%edx,12(%%rax)\n\t"
132 "movl %%esi,16(%%rax)\n\t"
133 "movl %%edi,20(%%rax)\n\t"
134 "popq %%rdx\n\t"
135 "movl %%edx,0(%%rax)\n\t"
136 "lahf\n\t"
137 "shrl $8,%%eax\n\t"
138 "andl $1,%%eax\n"
139 :"=a"(rc)
140 : "a"(regs)
141 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
142 #else
143 asm("pushl %%eax\n\t"
144 "movl 0(%%eax),%%edx\n\t"
145 "push %%edx\n\t"
146 "movl 4(%%eax),%%ebx\n\t"
147 "movl 8(%%eax),%%ecx\n\t"
148 "movl 12(%%eax),%%edx\n\t"
149 "movl 16(%%eax),%%esi\n\t"
150 "movl 20(%%eax),%%edi\n\t"
151 "popl %%eax\n\t"
152 "out %%al,$0xb2\n\t"
153 "out %%al,$0x84\n\t"
154 "xchgl %%eax,(%%esp)\n\t"
155 "movl %%ebx,4(%%eax)\n\t"
156 "movl %%ecx,8(%%eax)\n\t"
157 "movl %%edx,12(%%eax)\n\t"
158 "movl %%esi,16(%%eax)\n\t"
159 "movl %%edi,20(%%eax)\n\t"
160 "popl %%edx\n\t"
161 "movl %%edx,0(%%eax)\n\t"
162 "lahf\n\t"
163 "shrl $8,%%eax\n\t"
164 "andl $1,%%eax\n":"=a"(rc)
165 : "a"(regs)
166 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
167 #endif
168 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
169 return -EINVAL;
170
171 return 0;
172 }
173
174 /*
175 * Read the bios version. Return the version as an integer corresponding
176 * to the ascii value, for example "A17" is returned as 0x00413137.
177 */
178 static int i8k_get_bios_version(void)
179 {
180 struct smm_regs regs = { .eax = I8K_SMM_BIOS_VERSION, };
181
182 return i8k_smm(®s) ? : regs.eax;
183 }
184
185 /*
186 * Read the Fn key status.
187 */
188 static int i8k_get_fn_status(void)
189 {
190 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
191 int rc;
192
193 if ((rc = i8k_smm(®s)) < 0)
194 return rc;
195
196 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
197 case I8K_FN_UP:
198 return I8K_VOL_UP;
199 case I8K_FN_DOWN:
200 return I8K_VOL_DOWN;
201 case I8K_FN_MUTE:
202 return I8K_VOL_MUTE;
203 default:
204 return 0;
205 }
206 }
207
208 /*
209 * Read the power status.
210 */
211 static int i8k_get_power_status(void)
212 {
213 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
214 int rc;
215
216 if ((rc = i8k_smm(®s)) < 0)
217 return rc;
218
219 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
220 }
221
222 /*
223 * Read the fan status.
224 */
225 static int i8k_get_fan_status(int fan)
226 {
227 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
228
229 regs.ebx = fan & 0xff;
230 return i8k_smm(®s) ? : regs.eax & 0xff;
231 }
232
233 /*
234 * Read the fan speed in RPM.
235 */
236 static int i8k_get_fan_speed(int fan)
237 {
238 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
239
240 regs.ebx = fan & 0xff;
241 return i8k_smm(®s) ? : (regs.eax & 0xffff) * I8K_FAN_MULT;
242 }
243
244 /*
245 * Set the fan speed (off, low, high). Returns the new fan status.
246 */
247 static int i8k_set_fan(int fan, int speed)
248 {
249 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
250
251 speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);
252 regs.ebx = (fan & 0xff) | (speed << 8);
253
254 return i8k_smm(®s) ? : i8k_get_fan_status(fan);
255 }
256
257 /*
258 * Read the cpu temperature.
259 */
260 static int i8k_get_temp(int sensor)
261 {
262 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, };
263 int rc;
264 int temp;
265
266 #ifdef I8K_TEMPERATURE_BUG
267 static int prev;
268 #endif
269 regs.ebx = sensor & 0xff;
270 if ((rc = i8k_smm(®s)) < 0)
271 return rc;
272
273 temp = regs.eax & 0xff;
274
275 #ifdef I8K_TEMPERATURE_BUG
276 /*
277 * Sometimes the temperature sensor returns 0x99, which is out of range.
278 * In this case we return (once) the previous cached value. For example:
279 # 1003655137 00000058 00005a4b
280 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
281 # 1003655139 00000054 00005c52
282 */
283 if (temp > I8K_MAX_TEMP) {
284 temp = prev;
285 prev = I8K_MAX_TEMP;
286 } else {
287 prev = temp;
288 }
289 #endif
290
291 return temp;
292 }
293
294 static int i8k_get_dell_signature(int req_fn)
295 {
296 struct smm_regs regs = { .eax = req_fn, };
297 int rc;
298
299 if ((rc = i8k_smm(®s)) < 0)
300 return rc;
301
302 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
303 }
304
305 static int i8k_ioctl(struct inode *ip, struct file *fp, unsigned int cmd,
306 unsigned long arg)
307 {
308 int val = 0;
309 int speed;
310 unsigned char buff[16];
311 int __user *argp = (int __user *)arg;
312
313 if (!argp)
314 return -EINVAL;
315
316 switch (cmd) {
317 case I8K_BIOS_VERSION:
318 val = i8k_get_bios_version();
319 break;
320
321 case I8K_MACHINE_ID:
322 memset(buff, 0, 16);
323 strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), sizeof(buff));
324 break;
325
326 case I8K_FN_STATUS:
327 val = i8k_get_fn_status();
328 break;
329
330 case I8K_POWER_STATUS:
331 val = i8k_get_power_status();
332 break;
333
334 case I8K_GET_TEMP:
335 val = i8k_get_temp(0);
336 break;
337
338 case I8K_GET_SPEED:
339 if (copy_from_user(&val, argp, sizeof(int)))
340 return -EFAULT;
341
342 val = i8k_get_fan_speed(val);
343 break;
344
345 case I8K_GET_FAN:
346 if (copy_from_user(&val, argp, sizeof(int)))
347 return -EFAULT;
348
349 val = i8k_get_fan_status(val);
350 break;
351
352 case I8K_SET_FAN:
353 if (restricted && !capable(CAP_SYS_ADMIN))
354 return -EPERM;
355
356 if (copy_from_user(&val, argp, sizeof(int)))
357 return -EFAULT;
358
359 if (copy_from_user(&speed, argp + 1, sizeof(int)))
360 return -EFAULT;
361
362 val = i8k_set_fan(val, speed);
363 break;
364
365 default:
366 return -EINVAL;
367 }
368
369 if (val < 0)
370 return val;
371
372 switch (cmd) {
373 case I8K_BIOS_VERSION:
374 if (copy_to_user(argp, &val, 4))
375 return -EFAULT;
376
377 break;
378 case I8K_MACHINE_ID:
379 if (copy_to_user(argp, buff, 16))
380 return -EFAULT;
381
382 break;
383 default:
384 if (copy_to_user(argp, &val, sizeof(int)))
385 return -EFAULT;
386
387 break;
388 }
389
390 return 0;
391 }
392
393 /*
394 * Print the information for /proc/i8k.
395 */
396 static int i8k_proc_show(struct seq_file *seq, void *offset)
397 {
398 int fn_key, cpu_temp, ac_power;
399 int left_fan, right_fan, left_speed, right_speed;
400
401 cpu_temp = i8k_get_temp(0); /* 11100 µs */
402 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */
403 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */
404 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */
405 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */
406 fn_key = i8k_get_fn_status(); /* 750 µs */
407 if (power_status)
408 ac_power = i8k_get_power_status(); /* 14700 µs */
409 else
410 ac_power = -1;
411
412 /*
413 * Info:
414 *
415 * 1) Format version (this will change if format changes)
416 * 2) BIOS version
417 * 3) BIOS machine ID
418 * 4) Cpu temperature
419 * 5) Left fan status
420 * 6) Right fan status
421 * 7) Left fan speed
422 * 8) Right fan speed
423 * 9) AC power
424 * 10) Fn Key status
425 */
426 return seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
427 I8K_PROC_FMT,
428 bios_version,
429 i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
430 cpu_temp,
431 left_fan, right_fan, left_speed, right_speed,
432 ac_power, fn_key);
433 }
434
435 static int i8k_open_fs(struct inode *inode, struct file *file)
436 {
437 return single_open(file, i8k_proc_show, NULL);
438 }
439
440 static struct dmi_system_id __initdata i8k_dmi_table[] = {
441 {
442 .ident = "Dell Inspiron",
443 .matches = {
444 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
445 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
446 },
447 },
448 {
449 .ident = "Dell Latitude",
450 .matches = {
451 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
452 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
453 },
454 },
455 {
456 .ident = "Dell Inspiron 2",
457 .matches = {
458 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
459 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
460 },
461 },
462 {
463 .ident = "Dell Latitude 2",
464 .matches = {
465 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
466 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
467 },
468 },
469 { /* UK Inspiron 6400 */
470 .ident = "Dell Inspiron 3",
471 .matches = {
472 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
473 DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
474 },
475 },
476 {
477 .ident = "Dell Inspiron 3",
478 .matches = {
479 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
480 DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
481 },
482 },
483 { }
484 };
485
486 /*
487 * Probe for the presence of a supported laptop.
488 */
489 static int __init i8k_probe(void)
490 {
491 char buff[4];
492 int version;
493
494 /*
495 * Get DMI information
496 */
497 if (!dmi_check_system(i8k_dmi_table)) {
498 if (!ignore_dmi && !force)
499 return -ENODEV;
500
501 printk(KERN_INFO "i8k: not running on a supported Dell system.\n");
502 printk(KERN_INFO "i8k: vendor=%s, model=%s, version=%s\n",
503 i8k_get_dmi_data(DMI_SYS_VENDOR),
504 i8k_get_dmi_data(DMI_PRODUCT_NAME),
505 i8k_get_dmi_data(DMI_BIOS_VERSION));
506 }
507
508 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), sizeof(bios_version));
509
510 /*
511 * Get SMM Dell signature
512 */
513 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
514 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
515 printk(KERN_ERR "i8k: unable to get SMM Dell signature\n");
516 if (!force)
517 return -ENODEV;
518 }
519
520 /*
521 * Get SMM BIOS version.
522 */
523 version = i8k_get_bios_version();
524 if (version <= 0) {
525 printk(KERN_WARNING "i8k: unable to get SMM BIOS version\n");
526 } else {
527 buff[0] = (version >> 16) & 0xff;
528 buff[1] = (version >> 8) & 0xff;
529 buff[2] = (version) & 0xff;
530 buff[3] = '\0';
531 /*
532 * If DMI BIOS version is unknown use SMM BIOS version.
533 */
534 if (!dmi_get_system_info(DMI_BIOS_VERSION))
535 strlcpy(bios_version, buff, sizeof(bios_version));
536
537 /*
538 * Check if the two versions match.
539 */
540 if (strncmp(buff, bios_version, sizeof(bios_version)) != 0)
541 printk(KERN_WARNING "i8k: BIOS version mismatch: %s != %s\n",
542 buff, bios_version);
543 }
544
545 return 0;
546 }
547
548 static int __init i8k_init(void)
549 {
550 struct proc_dir_entry *proc_i8k;
551
552 /* Are we running on an supported laptop? */
553 if (i8k_probe())
554 return -ENODEV;
555
556 /* Register the proc entry */
557 proc_i8k = create_proc_entry("i8k", 0, NULL);
558 if (!proc_i8k)
559 return -ENOENT;
560
561 proc_i8k->proc_fops = &i8k_fops;
562 proc_i8k->owner = THIS_MODULE;
563
564 printk(KERN_INFO
565 "Dell laptop SMM driver v%s Massimo Dal Zotto (dz@debian.org)\n",
566 I8K_VERSION);
567
568 return 0;
569 }
570
571 static void __exit i8k_exit(void)
572 {
573 remove_proc_entry("i8k", NULL);
574 }
575
576 module_init(i8k_init);
577 module_exit(i8k_exit);
578
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