Root/
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 | .ident = "Dell Precision", |
490 | .matches = { |
491 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
492 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision"), |
493 | }, |
494 | }, |
495 | { |
496 | .ident = "Dell Vostro", |
497 | .matches = { |
498 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
499 | DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"), |
500 | }, |
501 | }, |
502 | { } |
503 | }; |
504 | |
505 | /* |
506 | * Probe for the presence of a supported laptop. |
507 | */ |
508 | static int __init i8k_probe(void) |
509 | { |
510 | char buff[4]; |
511 | int version; |
512 | |
513 | /* |
514 | * Get DMI information |
515 | */ |
516 | if (!dmi_check_system(i8k_dmi_table)) { |
517 | if (!ignore_dmi && !force) |
518 | return -ENODEV; |
519 | |
520 | printk(KERN_INFO "i8k: not running on a supported Dell system.\n"); |
521 | printk(KERN_INFO "i8k: vendor=%s, model=%s, version=%s\n", |
522 | i8k_get_dmi_data(DMI_SYS_VENDOR), |
523 | i8k_get_dmi_data(DMI_PRODUCT_NAME), |
524 | i8k_get_dmi_data(DMI_BIOS_VERSION)); |
525 | } |
526 | |
527 | strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), sizeof(bios_version)); |
528 | |
529 | /* |
530 | * Get SMM Dell signature |
531 | */ |
532 | if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) && |
533 | i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) { |
534 | printk(KERN_ERR "i8k: unable to get SMM Dell signature\n"); |
535 | if (!force) |
536 | return -ENODEV; |
537 | } |
538 | |
539 | /* |
540 | * Get SMM BIOS version. |
541 | */ |
542 | version = i8k_get_bios_version(); |
543 | if (version <= 0) { |
544 | printk(KERN_WARNING "i8k: unable to get SMM BIOS version\n"); |
545 | } else { |
546 | buff[0] = (version >> 16) & 0xff; |
547 | buff[1] = (version >> 8) & 0xff; |
548 | buff[2] = (version) & 0xff; |
549 | buff[3] = '\0'; |
550 | /* |
551 | * If DMI BIOS version is unknown use SMM BIOS version. |
552 | */ |
553 | if (!dmi_get_system_info(DMI_BIOS_VERSION)) |
554 | strlcpy(bios_version, buff, sizeof(bios_version)); |
555 | |
556 | /* |
557 | * Check if the two versions match. |
558 | */ |
559 | if (strncmp(buff, bios_version, sizeof(bios_version)) != 0) |
560 | printk(KERN_WARNING "i8k: BIOS version mismatch: %s != %s\n", |
561 | buff, bios_version); |
562 | } |
563 | |
564 | return 0; |
565 | } |
566 | |
567 | static int __init i8k_init(void) |
568 | { |
569 | struct proc_dir_entry *proc_i8k; |
570 | |
571 | /* Are we running on an supported laptop? */ |
572 | if (i8k_probe()) |
573 | return -ENODEV; |
574 | |
575 | /* Register the proc entry */ |
576 | proc_i8k = proc_create("i8k", 0, NULL, &i8k_fops); |
577 | if (!proc_i8k) |
578 | return -ENOENT; |
579 | |
580 | printk(KERN_INFO |
581 | "Dell laptop SMM driver v%s Massimo Dal Zotto (dz@debian.org)\n", |
582 | I8K_VERSION); |
583 | |
584 | return 0; |
585 | } |
586 | |
587 | static void __exit i8k_exit(void) |
588 | { |
589 | remove_proc_entry("i8k", NULL); |
590 | } |
591 | |
592 | module_init(i8k_init); |
593 | module_exit(i8k_exit); |
594 |
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jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9