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/version.h>
21 #include <linux/types.h>
22 #include <linux/init.h>
23 #include <linux/proc_fs.h>
24 #include <linux/apm_bios.h>
25 #include <linux/kbd_kern.h>
26 #include <linux/kbd_ll.h>
27 #include <linux/timer.h>
28 #include <asm/uaccess.h>
29 #include <asm/io.h>
30
31 #include <linux/i8k.h>
32
33 #define I8K_VERSION "1.13 14/05/2002"
34
35 #define I8K_SMM_FN_STATUS 0x0025
36 #define I8K_SMM_POWER_STATUS 0x0069
37 #define I8K_SMM_SET_FAN 0x01a3
38 #define I8K_SMM_GET_FAN 0x00a3
39 #define I8K_SMM_GET_SPEED 0x02a3
40 #define I8K_SMM_GET_TEMP 0x10a3
41 #define I8K_SMM_GET_DELL_SIG 0xffa3
42 #define I8K_SMM_BIOS_VERSION 0x00a6
43
44 #define I8K_FAN_MULT 30
45 #define I8K_MAX_TEMP 127
46
47 #define I8K_FN_NONE 0x00
48 #define I8K_FN_UP 0x01
49 #define I8K_FN_DOWN 0x02
50 #define I8K_FN_MUTE 0x04
51 #define I8K_FN_MASK 0x07
52 #define I8K_FN_SHIFT 8
53
54 #define I8K_POWER_AC 0x05
55 #define I8K_POWER_BATTERY 0x01
56
57 #define I8K_TEMPERATURE_BUG 1
58
59 #define DELL_SIGNATURE "Dell Computer"
60
61 /* Interval between polling of keys, in jiffies. */
62 #define I8K_POLL_INTERVAL (HZ/20)
63 #define I8K_REPEAT_DELAY 250 /* 250 ms */
64 #define I8K_REPEAT_RATE 10
65
66 /*
67 * (To be escaped) Scancodes for the keys. These were chosen to match other
68 * "Internet" keyboards.
69 */
70 #define I8K_KEYS_UP_SCANCODE 0x30
71 #define I8K_KEYS_DOWN_SCANCODE 0x2e
72 #define I8K_KEYS_MUTE_SCANCODE 0x20
73
74 static char *supported_models[] = {
75 "Inspiron",
76 "Latitude",
77 NULL
78 };
79
80 static char system_vendor[48] = "?";
81 static char product_name [48] = "?";
82 static char bios_version [4] = "?";
83 static char serial_number[16] = "?";
84
85 int force = 0;
86 int restricted = 0;
87 int handle_buttons = 0;
88 int repeat_delay = I8K_REPEAT_DELAY;
89 int repeat_rate = I8K_REPEAT_RATE;
90 int power_status = 0;
91
92 static struct timer_list i8k_keys_timer;
93
94 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
95 MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
96 MODULE_LICENSE("GPL");
97 MODULE_PARM(force, "i");
98 MODULE_PARM(restricted, "i");
99 MODULE_PARM(handle_buttons, "i");
100 MODULE_PARM(repeat_delay, "i");
101 MODULE_PARM(repeat_rate, "i");
102 MODULE_PARM(power_status, "i");
103 MODULE_PARM_DESC(force, "Force loading without checking for supported models");
104 MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
105 MODULE_PARM_DESC(handle_buttons, "Generate keyboard events for i8k buttons");
106 MODULE_PARM_DESC(repeat_delay, "I8k buttons repeat delay (ms)");
107 MODULE_PARM_DESC(repeat_rate, "I8k buttons repeat rate");
108 MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
109
110 static ssize_t i8k_read(struct file *, char *, size_t, loff_t *);
111 static int i8k_ioctl(struct inode *, struct file *, unsigned int,
112 unsigned long);
113 static void i8k_keys_set_timer(void);
114
115 static struct file_operations i8k_fops = {
116 read: i8k_read,
117 ioctl: i8k_ioctl,
118 };
119
120 typedef struct {
121 unsigned int eax;
122 unsigned int ebx __attribute__ ((packed));
123 unsigned int ecx __attribute__ ((packed));
124 unsigned int edx __attribute__ ((packed));
125 unsigned int esi __attribute__ ((packed));
126 unsigned int edi __attribute__ ((packed));
127 } SMMRegisters;
128
129 typedef struct {
130 u8 type;
131 u8 length;
132 u16 handle;
133 } DMIHeader;
134
135 /*
136 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
137 */
i8k_smm(SMMRegisters * regs)138 static int i8k_smm(SMMRegisters *regs)
139 {
140 int rc;
141 int eax = regs->eax;
142
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" \
165 : "=a" (rc)
166 : "a" (regs)
167 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
168
169 if ((rc != 0) || ((regs->eax & 0xffff) == 0xffff) || (regs->eax == eax)) {
170 return -EINVAL;
171 }
172
173 return 0;
174 }
175
176 /*
177 * Read the bios version. Return the version as an integer corresponding
178 * to the ascii value, for example "A17" is returned as 0x00413137.
179 */
i8k_get_bios_version(void)180 static int i8k_get_bios_version(void)
181 {
182 SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
183 int rc;
184
185 regs.eax = I8K_SMM_BIOS_VERSION;
186 if ((rc=i8k_smm(®s)) < 0) {
187 return rc;
188 }
189
190 return regs.eax;
191 }
192
193 /*
194 * Read the machine id.
195 */
i8k_get_serial_number(unsigned char * buff)196 static int i8k_get_serial_number(unsigned char *buff)
197 {
198 strncpy(buff, serial_number, 16);
199 return 0;
200 }
201
202 /*
203 * Read the Fn key status.
204 */
i8k_get_fn_status(void)205 static int i8k_get_fn_status(void)
206 {
207 SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
208 int rc;
209
210 regs.eax = I8K_SMM_FN_STATUS;
211 if ((rc=i8k_smm(®s)) < 0) {
212 return rc;
213 }
214
215 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
216 case I8K_FN_UP:
217 return I8K_VOL_UP;
218 case I8K_FN_DOWN:
219 return I8K_VOL_DOWN;
220 case I8K_FN_MUTE:
221 return I8K_VOL_MUTE;
222 default:
223 return 0;
224 }
225 }
226
227 /*
228 * Read the power status.
229 */
i8k_get_power_status(void)230 static int i8k_get_power_status(void)
231 {
232 SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
233 int rc;
234
235 regs.eax = I8K_SMM_POWER_STATUS;
236 if ((rc=i8k_smm(®s)) < 0) {
237 return rc;
238 }
239
240 switch (regs.eax & 0xff) {
241 case I8K_POWER_AC:
242 return I8K_AC;
243 default:
244 return I8K_BATTERY;
245 }
246 }
247
248 /*
249 * Read the fan status.
250 */
i8k_get_fan_status(int fan)251 static int i8k_get_fan_status(int fan)
252 {
253 SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
254 int rc;
255
256 regs.eax = I8K_SMM_GET_FAN;
257 regs.ebx = fan & 0xff;
258 if ((rc=i8k_smm(®s)) < 0) {
259 return rc;
260 }
261
262 return (regs.eax & 0xff);
263 }
264
265 /*
266 * Read the fan speed in RPM.
267 */
i8k_get_fan_speed(int fan)268 static int i8k_get_fan_speed(int fan)
269 {
270 SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
271 int rc;
272
273 regs.eax = I8K_SMM_GET_SPEED;
274 regs.ebx = fan & 0xff;
275 if ((rc=i8k_smm(®s)) < 0) {
276 return rc;
277 }
278
279 return (regs.eax & 0xffff) * I8K_FAN_MULT;
280 }
281
282 /*
283 * Set the fan speed (off, low, high). Returns the new fan status.
284 */
i8k_set_fan(int fan,int speed)285 static int i8k_set_fan(int fan, int speed)
286 {
287 SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
288 int rc;
289
290 speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);
291
292 regs.eax = I8K_SMM_SET_FAN;
293 regs.ebx = (fan & 0xff) | (speed << 8);
294 if ((rc=i8k_smm(®s)) < 0) {
295 return rc;
296 }
297
298 return (i8k_get_fan_status(fan));
299 }
300
301 /*
302 * Read the cpu temperature.
303 */
i8k_get_cpu_temp(void)304 static int i8k_get_cpu_temp(void)
305 {
306 SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
307 int rc;
308 int temp;
309
310 #ifdef I8K_TEMPERATURE_BUG
311 static int prev = 0;
312 #endif
313
314 regs.eax = I8K_SMM_GET_TEMP;
315 if ((rc=i8k_smm(®s)) < 0) {
316 return rc;
317 }
318 temp = regs.eax & 0xff;
319
320 #ifdef I8K_TEMPERATURE_BUG
321 /*
322 * Sometimes the temperature sensor returns 0x99, which is out of range.
323 * In this case we return (once) the previous cached value. For example:
324 # 1003655137 00000058 00005a4b
325 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
326 # 1003655139 00000054 00005c52
327 */
328 if (temp > I8K_MAX_TEMP) {
329 temp = prev;
330 prev = I8K_MAX_TEMP;
331 } else {
332 prev = temp;
333 }
334 #endif
335
336 return temp;
337 }
338
i8k_get_dell_signature(void)339 static int i8k_get_dell_signature(void)
340 {
341 SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
342 int rc;
343
344 regs.eax = I8K_SMM_GET_DELL_SIG;
345 if ((rc=i8k_smm(®s)) < 0) {
346 return rc;
347 }
348
349 if ((regs.eax == 1145651527) && (regs.edx == 1145392204)) {
350 return 0;
351 } else {
352 return -1;
353 }
354 }
355
i8k_ioctl(struct inode * ip,struct file * fp,unsigned int cmd,unsigned long arg)356 static int i8k_ioctl(struct inode *ip, struct file *fp, unsigned int cmd,
357 unsigned long arg)
358 {
359 int val;
360 int speed;
361 unsigned char buff[16];
362
363 if (!arg) {
364 return -EINVAL;
365 }
366
367 switch (cmd) {
368 case I8K_BIOS_VERSION:
369 val = i8k_get_bios_version();
370 break;
371
372 case I8K_MACHINE_ID:
373 memset(buff, 0, 16);
374 val = i8k_get_serial_number(buff);
375 break;
376
377 case I8K_FN_STATUS:
378 val = i8k_get_fn_status();
379 break;
380
381 case I8K_POWER_STATUS:
382 val = i8k_get_power_status();
383 break;
384
385 case I8K_GET_TEMP:
386 val = i8k_get_cpu_temp();
387 break;
388
389 case I8K_GET_SPEED:
390 if (copy_from_user(&val, (int *)arg, sizeof(int))) {
391 return -EFAULT;
392 }
393 val = i8k_get_fan_speed(val);
394 break;
395
396 case I8K_GET_FAN:
397 if (copy_from_user(&val, (int *)arg, sizeof(int))) {
398 return -EFAULT;
399 }
400 val = i8k_get_fan_status(val);
401 break;
402
403 case I8K_SET_FAN:
404 if (restricted && !capable(CAP_SYS_ADMIN)) {
405 return -EPERM;
406 }
407 if (copy_from_user(&val, (int *)arg, sizeof(int))) {
408 return -EFAULT;
409 }
410 if (copy_from_user(&speed, (int *)arg+1, sizeof(int))) {
411 return -EFAULT;
412 }
413 val = i8k_set_fan(val, speed);
414 break;
415
416 default:
417 return -EINVAL;
418 }
419
420 if (val < 0) {
421 return val;
422 }
423
424 switch (cmd) {
425 case I8K_BIOS_VERSION:
426 if (copy_to_user((int *)arg, &val, 4)) {
427 return -EFAULT;
428 }
429 break;
430 case I8K_MACHINE_ID:
431 if (copy_to_user((int *)arg, buff, 16)) {
432 return -EFAULT;
433 }
434 break;
435 default:
436 if (copy_to_user((int *)arg, &val, sizeof(int))) {
437 return -EFAULT;
438 }
439 break;
440 }
441
442 return 0;
443 }
444
445 /*
446 * Print the information for /proc/i8k.
447 */
i8k_get_info(char * buffer,char ** start,off_t fpos,int length)448 static int i8k_get_info(char *buffer, char **start, off_t fpos, int length)
449 {
450 int n, fn_key, cpu_temp, ac_power;
451 int left_fan, right_fan, left_speed, right_speed;
452
453 cpu_temp = i8k_get_cpu_temp(); /* 11100 �s */
454 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 �s */
455 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 �s */
456 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 �s */
457 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 �s */
458 fn_key = i8k_get_fn_status(); /* 750 �s */
459 if (power_status) {
460 ac_power = i8k_get_power_status(); /* 14700 �s */
461 } else {
462 ac_power = -1;
463 }
464
465 /*
466 * Info:
467 *
468 * 1) Format version (this will change if format changes)
469 * 2) BIOS version
470 * 3) BIOS machine ID
471 * 4) Cpu temperature
472 * 5) Left fan status
473 * 6) Right fan status
474 * 7) Left fan speed
475 * 8) Right fan speed
476 * 9) AC power
477 * 10) Fn Key status
478 */
479 n = sprintf(buffer, "%s %s %s %d %d %d %d %d %d %d\n",
480 I8K_PROC_FMT,
481 bios_version,
482 serial_number,
483 cpu_temp,
484 left_fan,
485 right_fan,
486 left_speed,
487 right_speed,
488 ac_power,
489 fn_key);
490
491 return n;
492 }
493
i8k_read(struct file * f,char * buffer,size_t len,loff_t * fpos)494 static ssize_t i8k_read(struct file *f, char *buffer, size_t len, loff_t *fpos)
495 {
496 loff_t pos = *fpos;
497 int n;
498 char info[128];
499
500 n = i8k_get_info(info, NULL, 0, 128);
501 if (n <= 0) {
502 return n;
503 }
504
505 if (pos != (unsigned)pos || pos >= n) {
506 return 0;
507 }
508
509 if (len >= n - pos) {
510 len = n - pos;
511 }
512
513 if (copy_to_user(buffer, info, len) != 0) {
514 return -EFAULT;
515 }
516
517 *fpos = pos + len;
518 return len;
519 }
520
521 /*
522 * i8k_keys stuff. Thanks to David Bustos <bustos@caltech.edu>
523 */
524
i8k_keys_make_scancode(int x)525 static unsigned char i8k_keys_make_scancode(int x) {
526 switch (x) {
527 case I8K_FN_UP: return I8K_KEYS_UP_SCANCODE;
528 case I8K_FN_DOWN: return I8K_KEYS_DOWN_SCANCODE;
529 case I8K_FN_MUTE: return I8K_KEYS_MUTE_SCANCODE;
530 }
531
532 return 0;
533 }
534
i8k_keys_poll(unsigned long data)535 static void i8k_keys_poll(unsigned long data) {
536 static int last = 0;
537 static int repeat = 0;
538
539 int curr;
540
541 curr = i8k_get_fn_status();
542 if (curr >= 0) {
543 if (curr != last) {
544 repeat = jiffies + (HZ * repeat_delay / 1000);
545
546 if (last != 0) {
547 handle_scancode(0xe0, 0);
548 handle_scancode(i8k_keys_make_scancode(last), 0);
549 }
550
551 if (curr != 0) {
552 handle_scancode(0xe0, 1);
553 handle_scancode(i8k_keys_make_scancode(curr), 1);
554 }
555 } else {
556 /* Generate keyboard repeat events with current scancode -- dz */
557 if ((curr) && (repeat_rate > 0) && (jiffies >= repeat)) {
558 repeat = jiffies + (HZ / repeat_rate);
559 handle_scancode(0xe0, 1);
560 handle_scancode(i8k_keys_make_scancode(curr), 1);
561 }
562 }
563
564 last = curr;
565 }
566
567 /* Reset the timer. */
568 i8k_keys_set_timer();
569 }
570
i8k_keys_set_timer()571 static void i8k_keys_set_timer() {
572 i8k_keys_timer.expires = jiffies + I8K_POLL_INTERVAL;
573 add_timer(&i8k_keys_timer);
574 }
575
string_trim(char * s,int size)576 static char* __init string_trim(char *s, int size)
577 {
578 int len;
579 char *p;
580
581 if ((len = strlen(s)) > size) {
582 len = size;
583 }
584
585 for (p=s+len-1; len && (*p==' '); len--,p--) {
586 *p = '\0';
587 }
588
589 return s;
590 }
591
592 /* DMI code, stolen from arch/i386/kernel/dmi_scan.c */
593
594 /*
595 * |<-- dmi->length -->|
596 * | |
597 * |dmi header s=N | string1,\0, ..., stringN,\0, ..., \0
598 * | |
599 * +-----------------------+
600 */
dmi_string(DMIHeader * dmi,u8 s)601 static char* __init dmi_string(DMIHeader *dmi, u8 s)
602 {
603 u8 *p;
604
605 if (!s) {
606 return "";
607 }
608 s--;
609
610 p = (u8 *)dmi + dmi->length;
611 while (s > 0) {
612 p += strlen(p);
613 p++;
614 s--;
615 }
616
617 return p;
618 }
619
dmi_decode(DMIHeader * dmi)620 static void __init dmi_decode(DMIHeader *dmi)
621 {
622 u8 *data = (u8 *) dmi;
623 char *p;
624
625 #ifdef I8K_DEBUG
626 int i;
627 printk("%08x ", (int)data);
628 for (i=0; i<data[1] && i<64; i++) {
629 printk("%02x ", data[i]);
630 }
631 printk("\n");
632 #endif
633
634 switch (dmi->type) {
635 case 0: /* BIOS Information */
636 p = dmi_string(dmi,data[5]);
637 if (*p) {
638 strncpy(bios_version, p, sizeof(bios_version));
639 string_trim(bios_version, sizeof(bios_version));
640 }
641 break;
642 case 1: /* System Information */
643 p = dmi_string(dmi,data[4]);
644 if (*p) {
645 strncpy(system_vendor, p, sizeof(system_vendor));
646 string_trim(system_vendor, sizeof(system_vendor));
647 }
648 p = dmi_string(dmi,data[5]);
649 if (*p) {
650 strncpy(product_name, p, sizeof(product_name));
651 string_trim(product_name, sizeof(product_name));
652 }
653 p = dmi_string(dmi,data[7]);
654 if (*p) {
655 strncpy(serial_number, p, sizeof(serial_number));
656 string_trim(serial_number, sizeof(serial_number));
657 }
658 break;
659 }
660 }
661
dmi_table(u32 base,int len,int num,void (* fn)(DMIHeader *))662 static int __init dmi_table(u32 base, int len, int num, void (*fn)(DMIHeader*))
663 {
664 u8 *buf;
665 u8 *data;
666 DMIHeader *dmi;
667 int i = 1;
668
669 buf = ioremap(base, len);
670 if (buf == NULL) {
671 return -1;
672 }
673 data = buf;
674
675 /*
676 * Stop when we see al the items the table claimed to have
677 * or we run off the end of the table (also happens)
678 */
679 while ((i<num) && ((data-buf) < len)) {
680 dmi = (DMIHeader *)data;
681 /*
682 * Avoid misparsing crud if the length of the last
683 * record is crap
684 */
685 if ((data-buf+dmi->length) >= len) {
686 break;
687 }
688 fn(dmi);
689 data += dmi->length;
690 /*
691 * Don't go off the end of the data if there is
692 * stuff looking like string fill past the end
693 */
694 while (((data-buf) < len) && (*data || data[1])) {
695 data++;
696 }
697 data += 2;
698 i++;
699 }
700 iounmap(buf);
701
702 return 0;
703 }
704
dmi_iterate(void (* decode)(DMIHeader *))705 static int __init dmi_iterate(void (*decode)(DMIHeader *))
706 {
707 unsigned char buf[20];
708 long fp = 0x000e0000L;
709 fp -= 16;
710
711 while (fp < 0x000fffffL) {
712 fp += 16;
713 isa_memcpy_fromio(buf, fp, 20);
714 if (memcmp(buf, "_DMI_", 5)==0) {
715 u16 num = buf[13]<<8 | buf[12];
716 u16 len = buf [7]<<8 | buf [6];
717 u32 base = buf[11]<<24 | buf[10]<<16 | buf[9]<<8 | buf[8];
718 #ifdef I8K_DEBUG
719 printk(KERN_INFO "DMI %d.%d present.\n",
720 buf[14]>>4, buf[14]&0x0F);
721 printk(KERN_INFO "%d structures occupying %d bytes.\n",
722 buf[13]<<8 | buf[12],
723 buf [7]<<8 | buf[6]);
724 printk(KERN_INFO "DMI table at 0x%08X.\n",
725 buf[11]<<24 | buf[10]<<16 | buf[9]<<8 | buf[8]);
726 #endif
727 if (dmi_table(base, len, num, decode)==0) {
728 return 0;
729 }
730 }
731 }
732 return -1;
733 }
734 /* end of DMI code */
735
736 /*
737 * Get DMI information.
738 */
i8k_dmi_probe(void)739 static int __init i8k_dmi_probe(void)
740 {
741 char **p;
742
743 if (dmi_iterate(dmi_decode) != 0) {
744 printk(KERN_INFO "i8k: unable to get DMI information\n");
745 return -ENODEV;
746 }
747
748 if (strncmp(system_vendor,DELL_SIGNATURE,strlen(DELL_SIGNATURE)) != 0) {
749 printk(KERN_INFO "i8k: not running on a Dell system\n");
750 return -ENODEV;
751 }
752
753 for (p=supported_models; ; p++) {
754 if (!*p) {
755 printk(KERN_INFO "i8k: unsupported model: %s\n", product_name);
756 return -ENODEV;
757 }
758 if (strncmp(product_name,*p,strlen(*p)) == 0) {
759 break;
760 }
761 }
762
763 return 0;
764 }
765
766 /*
767 * Probe for the presence of a supported laptop.
768 */
i8k_probe(void)769 static int __init i8k_probe(void)
770 {
771 char buff[4];
772 int version;
773 int smm_found = 0;
774
775 /*
776 * Get DMI information
777 */
778 if (i8k_dmi_probe() != 0) {
779 printk(KERN_INFO "i8k: vendor=%s, model=%s, version=%s\n",
780 system_vendor, product_name, bios_version);
781 }
782
783 /*
784 * Get SMM Dell signature
785 */
786 if (i8k_get_dell_signature() != 0) {
787 printk(KERN_INFO "i8k: unable to get SMM Dell signature\n");
788 } else {
789 smm_found = 1;
790 }
791
792 /*
793 * Get SMM BIOS version.
794 */
795 version = i8k_get_bios_version();
796 if (version <= 0) {
797 printk(KERN_INFO "i8k: unable to get SMM BIOS version\n");
798 } else {
799 smm_found = 1;
800 buff[0] = (version >> 16) & 0xff;
801 buff[1] = (version >> 8) & 0xff;
802 buff[2] = (version) & 0xff;
803 buff[3] = '\0';
804 /*
805 * If DMI BIOS version is unknown use SMM BIOS version.
806 */
807 if (bios_version[0] == '?') {
808 strcpy(bios_version, buff);
809 }
810 /*
811 * Check if the two versions match.
812 */
813 if (strncmp(buff,bios_version,sizeof(bios_version)) != 0) {
814 printk(KERN_INFO "i8k: BIOS version mismatch: %s != %s\n",
815 buff, bios_version);
816 }
817 }
818
819 if (!smm_found && !force) {
820 return -ENODEV;
821 }
822
823 return 0;
824 }
825
826 #ifdef MODULE
827 static
828 #endif
i8k_init(void)829 int __init i8k_init(void)
830 {
831 struct proc_dir_entry *proc_i8k;
832
833 /* Are we running on an supported laptop? */
834 if (i8k_probe() != 0) {
835 return -ENODEV;
836 }
837
838 /* Register the proc entry */
839 proc_i8k = create_proc_info_entry("i8k", 0, NULL, i8k_get_info);
840 if (!proc_i8k) {
841 return -ENOENT;
842 }
843 proc_i8k->proc_fops = &i8k_fops;
844 SET_MODULE_OWNER(proc_i8k);
845
846 printk(KERN_INFO
847 "Dell laptop SMM driver v%s Massimo Dal Zotto (dz@debian.org)\n",
848 I8K_VERSION);
849
850 /* Register the i8k_keys timer. */
851 if (handle_buttons) {
852 printk(KERN_INFO
853 "i8k: enabling buttons events, delay=%d, rate=%d\n",
854 repeat_delay, repeat_rate);
855 init_timer(&i8k_keys_timer);
856 i8k_keys_timer.function = i8k_keys_poll;
857 i8k_keys_set_timer();
858 }
859
860 return 0;
861 }
862
863 #ifdef MODULE
init_module(void)864 int init_module(void)
865 {
866 return i8k_init();
867 }
868
cleanup_module(void)869 void cleanup_module(void)
870 {
871 /* Remove the proc entry */
872 remove_proc_entry("i8k", NULL);
873
874 /* Unregister the i8k_keys timer. */
875 while (handle_buttons && !del_timer(&i8k_keys_timer)) {
876 schedule_timeout(I8K_POLL_INTERVAL);
877 }
878
879 printk(KERN_INFO "i8k: module unloaded\n");
880 }
881 #endif
882
883 /* end of file */
884