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