drivers/char/i8k.c

   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 <asm/uaccess.h>
  26 #include <asm/io.h>
  27
  28 #include <linux/i8k.h>
  29
  30 #define I8K_VERSION             "1.13 14/05/2002"
  31
  32 #define I8K_SMM_FN_STATUS       0x0025
  33 #define I8K_SMM_POWER_STATUS    0x0069
  34 #define I8K_SMM_SET_FAN         0x01a3
  35 #define I8K_SMM_GET_FAN         0x00a3
  36 #define I8K_SMM_GET_SPEED       0x02a3
  37 #define I8K_SMM_GET_TEMP        0x10a3
  38 #define I8K_SMM_GET_DELL_SIG    0xffa3
  39 #define I8K_SMM_BIOS_VERSION    0x00a6
  40
  41 #define I8K_FAN_MULT            30
  42 #define I8K_MAX_TEMP            127
  43
  44 #define I8K_FN_NONE             0x00
  45 #define I8K_FN_UP               0x01
  46 #define I8K_FN_DOWN             0x02
  47 #define I8K_FN_MUTE             0x04
  48 #define I8K_FN_MASK             0x07
  49 #define I8K_FN_SHIFT            8
  50
  51 #define I8K_POWER_AC            0x05
  52 #define I8K_POWER_BATTERY       0x01
  53
  54 #define I8K_TEMPERATURE_BUG     1
  55
  56 #define DELL_SIGNATURE          "Dell Computer"
  57
  58 static char *supported_models[] = {
  59     "Inspiron",
  60     "Latitude",
  61     NULL
  62 };
  63
  64 static char system_vendor[48] = "?";
  65 static char product_name [48] = "?";
  66 static char bios_version [4]  = "?";
  67 static char serial_number[16] = "?";
  68
  69 static int force = 0;
  70 static int restricted = 0;
  71 static int power_status = 0;
  72
  73 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
  74 MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
  75 MODULE_LICENSE("GPL");
  76 MODULE_PARM(force, "i");
  77 MODULE_PARM(restricted, "i");
  78 MODULE_PARM(power_status, "i");
  79 MODULE_PARM_DESC(force, "Force loading without checking for supported models");
  80 MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
  81 MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
  82
  83 static ssize_t i8k_read(struct file *, char *, size_t, loff_t *);
  84 static int i8k_ioctl(struct inode *, struct file *, unsigned int,
  85                      unsigned long);
  86
  87 static struct file_operations i8k_fops = {
  88     .read       = i8k_read,
  89     .ioctl      = i8k_ioctl,
  90 };
  91
  92 typedef struct {
  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 } SMMRegisters;
 100
 101 typedef struct {
 102     u8  type;
 103     u8  length;
 104     u16 handle;
 105 } DMIHeader;
 106
 107 /*
 108  * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
 109  */
 110 static int i8k_smm(SMMRegisters *regs)
 111 {
 112     int rc;
 113     int eax = regs->eax;
 114
 115     asm("pushl %%eax\n\t" \
 116         "movl 0(%%eax),%%edx\n\t" \
 117         "push %%edx\n\t" \
 118         "movl 4(%%eax),%%ebx\n\t" \
 119         "movl 8(%%eax),%%ecx\n\t" \
 120         "movl 12(%%eax),%%edx\n\t" \
 121         "movl 16(%%eax),%%esi\n\t" \
 122         "movl 20(%%eax),%%edi\n\t" \
 123         "popl %%eax\n\t" \
 124         "out %%al,$0xb2\n\t" \
 125         "out %%al,$0x84\n\t" \
 126         "xchgl %%eax,(%%esp)\n\t"
 127         "movl %%ebx,4(%%eax)\n\t" \
 128         "movl %%ecx,8(%%eax)\n\t" \
 129         "movl %%edx,12(%%eax)\n\t" \
 130         "movl %%esi,16(%%eax)\n\t" \
 131         "movl %%edi,20(%%eax)\n\t" \
 132         "popl %%edx\n\t" \
 133         "movl %%edx,0(%%eax)\n\t" \
 134         "lahf\n\t" \
 135         "shrl $8,%%eax\n\t" \
 136         "andl $1,%%eax\n" \
 137         : "=a" (rc)
 138         : "a" (regs)
 139         : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
 140
 141     if ((rc != 0) || ((regs->eax & 0xffff) == 0xffff) || (regs->eax == eax)) {
 142         return -EINVAL;
 143     }
 144
 145     return 0;
 146 }
 147
 148 /*
 149  * Read the bios version. Return the version as an integer corresponding
 150  * to the ascii value, for example "A17" is returned as 0x00413137.
 151  */
 152 static int i8k_get_bios_version(void)
 153 {
 154     SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
 155     int rc;
 156
 157     regs.eax = I8K_SMM_BIOS_VERSION;
 158     if ((rc=i8k_smm(&regs)) < 0) {
 159         return rc;
 160     }
 161
 162     return regs.eax;
 163 }
 164
 165 /*
 166  * Read the machine id.
 167  */
 168 static int i8k_get_serial_number(unsigned char *buff)
 169 {
 170     strncpy(buff, serial_number, 16);
 171     return 0;
 172 }
 173
 174 /*
 175  * Read the Fn key status.
 176  */
 177 static int i8k_get_fn_status(void)
 178 {
 179     SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
 180     int rc;
 181
 182     regs.eax = I8K_SMM_FN_STATUS;
 183     if ((rc=i8k_smm(&regs)) < 0) {
 184         return rc;
 185     }
 186
 187     switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
 188     case I8K_FN_UP:
 189         return I8K_VOL_UP;
 190     case I8K_FN_DOWN:
 191         return I8K_VOL_DOWN;
 192     case I8K_FN_MUTE:
 193         return I8K_VOL_MUTE;
 194     default:
 195         return 0;
 196     }
 197 }
 198
 199 /*
 200  * Read the power status.
 201  */
 202 static int i8k_get_power_status(void)
 203 {
 204     SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
 205     int rc;
 206
 207     regs.eax = I8K_SMM_POWER_STATUS;
 208     if ((rc=i8k_smm(&regs)) < 0) {
 209         return rc;
 210     }
 211
 212     switch (regs.eax & 0xff) {
 213     case I8K_POWER_AC:
 214         return I8K_AC;
 215     default:
 216         return I8K_BATTERY;
 217     }
 218 }
 219
 220 /*
 221  * Read the fan status.
 222  */
 223 static int i8k_get_fan_status(int fan)
 224 {
 225     SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
 226     int rc;
 227
 228     regs.eax = I8K_SMM_GET_FAN;
 229     regs.ebx = fan & 0xff;
 230     if ((rc=i8k_smm(&regs)) < 0) {
 231         return rc;
 232     }
 233
 234     return (regs.eax & 0xff);
 235 }
 236
 237 /*
 238  * Read the fan speed in RPM.
 239  */
 240 static int i8k_get_fan_speed(int fan)
 241 {
 242     SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
 243     int rc;
 244
 245     regs.eax = I8K_SMM_GET_SPEED;
 246     regs.ebx = fan & 0xff;
 247     if ((rc=i8k_smm(&regs)) < 0) {
 248         return rc;
 249     }
 250
 251     return (regs.eax & 0xffff) * I8K_FAN_MULT;
 252 }
 253
 254 /*
 255  * Set the fan speed (off, low, high). Returns the new fan status.
 256  */
 257 static int i8k_set_fan(int fan, int speed)
 258 {
 259     SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
 260     int rc;
 261
 262     speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);
 263
 264     regs.eax = I8K_SMM_SET_FAN;
 265     regs.ebx = (fan & 0xff) | (speed << 8);
 266     if ((rc=i8k_smm(&regs)) < 0) {
 267         return rc;
 268     }
 269
 270     return (i8k_get_fan_status(fan));
 271 }
 272
 273 /*
 274  * Read the cpu temperature.
 275  */
 276 static int i8k_get_cpu_temp(void)
 277 {
 278     SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
 279     int rc;
 280     int temp;
 281
 282 #ifdef I8K_TEMPERATURE_BUG
 283     static int prev = 0;
 284 #endif
 285
 286     regs.eax = I8K_SMM_GET_TEMP;
 287     if ((rc=i8k_smm(&regs)) < 0) {
 288         return rc;
 289     }
 290     temp = regs.eax & 0xff;
 291
 292 #ifdef I8K_TEMPERATURE_BUG
 293     /*
 294      * Sometimes the temperature sensor returns 0x99, which is out of range.
 295      * In this case we return (once) the previous cached value. For example:
 296      # 1003655137 00000058 00005a4b
 297      # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
 298      # 1003655139 00000054 00005c52
 299      */
 300     if (temp > I8K_MAX_TEMP) {
 301         temp = prev;
 302         prev = I8K_MAX_TEMP;
 303     } else {
 304         prev = temp;
 305     }
 306 #endif
 307
 308     return temp;
 309 }
 310
 311 static int i8k_get_dell_signature(void)
 312 {
 313     SMMRegisters regs = { 0, 0, 0, 0, 0, 0 };
 314     int rc;
 315
 316     regs.eax = I8K_SMM_GET_DELL_SIG;
 317     if ((rc=i8k_smm(&regs)) < 0) {
 318         return rc;
 319     }
 320
 321     if ((regs.eax == 1145651527) && (regs.edx == 1145392204)) {
 322         return 0;
 323     } else {
 324         return -1;
 325     }
 326 }
 327
 328 static int i8k_ioctl(struct inode *ip, struct file *fp, unsigned int cmd,
 329                      unsigned long arg)
 330 {
 331     int val;
 332     int speed;
 333     unsigned char buff[16];
 334
 335     if (!arg) {
 336         return -EINVAL;
 337     }
 338
 339     switch (cmd) {
 340     case I8K_BIOS_VERSION:
 341         val = i8k_get_bios_version();
 342         break;
 343
 344     case I8K_MACHINE_ID:
 345         memset(buff, 0, 16);
 346         val = i8k_get_serial_number(buff);
 347         break;
 348
 349     case I8K_FN_STATUS:
 350         val = i8k_get_fn_status();
 351         break;
 352
 353     case I8K_POWER_STATUS:
 354         val = i8k_get_power_status();
 355         break;
 356
 357     case I8K_GET_TEMP:
 358         val = i8k_get_cpu_temp();
 359         break;
 360
 361     case I8K_GET_SPEED:
 362         if (copy_from_user(&val, (int *)arg, sizeof(int))) {
 363             return -EFAULT;
 364         }
 365         val = i8k_get_fan_speed(val);
 366         break;
 367
 368     case I8K_GET_FAN:
 369         if (copy_from_user(&val, (int *)arg, sizeof(int))) {
 370             return -EFAULT;
 371         }
 372         val = i8k_get_fan_status(val);
 373         break;
 374
 375     case I8K_SET_FAN:
 376         if (restricted && !capable(CAP_SYS_ADMIN)) {
 377             return -EPERM;
 378         }
 379         if (copy_from_user(&val, (int *)arg, sizeof(int))) {
 380             return -EFAULT;
 381         }
 382         if (copy_from_user(&speed, (int *)arg+1, sizeof(int))) {
 383             return -EFAULT;
 384         }
 385         val = i8k_set_fan(val, speed);
 386         break;
 387
 388     default:
 389         return -EINVAL;
 390     }
 391
 392     if (val < 0) {
 393         return val;
 394     }
 395
 396     switch (cmd) {
 397     case I8K_BIOS_VERSION:
 398         if (copy_to_user((int *)arg, &val, 4)) {
 399             return -EFAULT;
 400         }
 401         break;
 402     case I8K_MACHINE_ID:
 403         if (copy_to_user((int *)arg, buff, 16)) {
 404             return -EFAULT;
 405         }
 406         break;
 407     default:
 408         if (copy_to_user((int *)arg, &val, sizeof(int))) {
 409             return -EFAULT;
 410         }
 411         break;
 412     }
 413
 414     return 0;
 415 }
 416
 417 /*
 418  * Print the information for /proc/i8k.
 419  */
 420 static int i8k_get_info(char *buffer, char **start, off_t fpos, int length)
 421 {
 422     int n, fn_key, cpu_temp, ac_power;
 423     int left_fan, right_fan, left_speed, right_speed;
 424
 425     cpu_temp     = i8k_get_cpu_temp();                  /* 11100 µs */
 426     left_fan     = i8k_get_fan_status(I8K_FAN_LEFT);    /*   580 µs */
 427     right_fan    = i8k_get_fan_status(I8K_FAN_RIGHT);   /*   580 µs */
 428     left_speed   = i8k_get_fan_speed(I8K_FAN_LEFT);     /*   580 µs */
 429     right_speed  = i8k_get_fan_speed(I8K_FAN_RIGHT);    /*   580 µs */
 430     fn_key       = i8k_get_fn_status();                 /*   750 µs */
 431     if (power_status) {
 432         ac_power = i8k_get_power_status();              /* 14700 µs */
 433     } else {
 434         ac_power = -1;
 435     }
 436
 437     /*
 438      * Info:
 439      *
 440      * 1)  Format version (this will change if format changes)
 441      * 2)  BIOS version
 442      * 3)  BIOS machine ID
 443      * 4)  Cpu temperature
 444      * 5)  Left fan status
 445      * 6)  Right fan status
 446      * 7)  Left fan speed
 447      * 8)  Right fan speed
 448      * 9)  AC power
 449      * 10) Fn Key status
 450      */
 451     n = sprintf(buffer, "%s %s %s %d %d %d %d %d %d %d\n",
 452                 I8K_PROC_FMT,
 453                 bios_version,
 454                 serial_number,
 455                 cpu_temp,
 456                 left_fan,
 457                 right_fan,
 458                 left_speed,
 459                 right_speed,
 460                 ac_power,
 461                 fn_key);
 462
 463     return n;
 464 }
 465
 466 static ssize_t i8k_read(struct file *f, char *buffer, size_t len, loff_t *fpos)
 467 {
 468     int n;
 469     char info[128];
 470
 471     n = i8k_get_info(info, NULL, 0, 128);
 472     if (n <= 0) {
 473         return n;
 474     }
 475
 476     if (*fpos >= n) {
 477         return 0;
 478     }
 479
 480     if ((*fpos + len) >= n) {
 481         len = n - *fpos;
 482     }
 483
 484     if (copy_to_user(buffer, info, len) != 0) {
 485         return -EFAULT;
 486     }
 487
 488     *fpos += len;
 489     return len;
 490 }
 491
 492 static char* __init string_trim(char *s, int size)
 493 {
 494     int len;
 495     char *p;
 496
 497     if ((len = strlen(s)) > size) {
 498         len = size;
 499     }
 500
 501     for (p=s+len-1; len && (*p==' '); len--,p--) {
 502         *p = '\0';
 503     }
 504
 505     return s;
 506 }
 507
 508 /* DMI code, stolen from arch/i386/kernel/dmi_scan.c */
 509
 510 /*
 511  * |<-- dmi->length -->|
 512  * |                   |
 513  * |dmi header    s=N  | string1,\0, ..., stringN,\0, ..., \0
 514  *                |                       |
 515  *                +-----------------------+
 516  */
 517 static char* __init dmi_string(DMIHeader *dmi, u8 s)
 518 {
 519     u8 *p;
 520
 521     if (!s) {
 522         return "";
 523     }
 524     s--;
 525
 526     p = (u8 *)dmi + dmi->length;
 527     while (s > 0) {
 528         p += strlen(p);
 529         p++;
 530         s--;
 531     }
 532
 533     return p;
 534 }
 535
 536 static void __init dmi_decode(DMIHeader *dmi)
 537 {
 538     u8 *data = (u8 *) dmi;
 539     char *p;
 540
 541 #ifdef I8K_DEBUG
 542     int i;
 543     printk("%08x ", (int)data);
 544     for (i=0; i<data[1] && i<64; i++) {
 545         printk("%02x ", data[i]);
 546     }
 547     printk("\n");
 548 #endif
 549
 550     switch (dmi->type) {
 551     case  0:    /* BIOS Information */
 552         p = dmi_string(dmi,data[5]);
 553         if (*p) {
 554             strncpy(bios_version, p, sizeof(bios_version));
 555             string_trim(bios_version, sizeof(bios_version));
 556         }
 557         break;
 558     case 1:     /* System Information */
 559         p = dmi_string(dmi,data[4]);
 560         if (*p) {
 561             strncpy(system_vendor, p, sizeof(system_vendor));
 562             string_trim(system_vendor, sizeof(system_vendor));
 563         }
 564         p = dmi_string(dmi,data[5]);
 565         if (*p) {
 566             strncpy(product_name, p, sizeof(product_name));
 567             string_trim(product_name, sizeof(product_name));
 568         }
 569         p = dmi_string(dmi,data[7]);
 570         if (*p) {
 571             strncpy(serial_number, p, sizeof(serial_number));
 572             string_trim(serial_number, sizeof(serial_number));
 573         }
 574         break;
 575     }
 576 }
 577
 578 static int __init dmi_table(u32 base, int len, int num, void (*fn)(DMIHeader*))
 579 {
 580     u8 *buf;
 581     u8 *data;
 582     DMIHeader *dmi;
 583     int i = 1;
 584
 585     buf = ioremap(base, len);
 586     if (buf == NULL) {
 587         return -1;
 588     }
 589     data = buf;
 590
 591     /*
 592      * Stop when we see al the items the table claimed to have
 593      * or we run off the end of the table (also happens)
 594      */
 595     while ((i<num) && ((data-buf) < len)) {
 596         dmi = (DMIHeader *)data;
 597         /*
 598          * Avoid misparsing crud if the length of the last
 599          * record is crap
 600          */
 601         if ((data-buf+dmi->length) >= len) {
 602             break;
 603         }
 604         fn(dmi);
 605         data += dmi->length;
 606         /*
 607          * Don't go off the end of the data if there is
 608          * stuff looking like string fill past the end
 609          */
 610         while (((data-buf) < len) && (*data || data[1])) {
 611             data++;
 612         }
 613         data += 2;
 614         i++;
 615     }
 616     iounmap(buf);
 617
 618     return 0;
 619 }
 620
 621 static int __init dmi_iterate(void (*decode)(DMIHeader *))
 622 {
 623     unsigned char buf[20];
 624     long fp = 0x000e0000L;
 625     fp -= 16;
 626
 627     while (fp < 0x000fffffL) {
 628         fp += 16;
 629         isa_memcpy_fromio(buf, fp, 20);
 630         if (memcmp(buf, "_DMI_", 5)==0) {
 631             u16 num  = buf[13]<<8  | buf[12];
 632             u16 len  = buf [7]<<8  | buf [6];
 633             u32 base = buf[11]<<24 | buf[10]<<16 | buf[9]<<8 | buf[8];
 634 #ifdef I8K_DEBUG
 635             printk(KERN_INFO "DMI %d.%d present.\n",
 636                    buf[14]>>4, buf[14]&0x0F);
 637             printk(KERN_INFO "%d structures occupying %d bytes.\n",
 638                    buf[13]<<8 | buf[12],
 639                    buf [7]<<8 | buf[6]);
 640             printk(KERN_INFO "DMI table at 0x%08X.\n",
 641                    buf[11]<<24 | buf[10]<<16 | buf[9]<<8 | buf[8]);
 642 #endif
 643             if (dmi_table(base, len, num, decode)==0) {
 644                 return 0;
 645             }
 646         }
 647     }
 648     return -1;
 649 }
 650 /* end of DMI code */
 651
 652 /*
 653  * Get DMI information.
 654  */
 655 static int __init i8k_dmi_probe(void)
 656 {
 657     char **p;
 658
 659     if (dmi_iterate(dmi_decode) != 0) {
 660         printk(KERN_INFO "i8k: unable to get DMI information\n");
 661         return -ENODEV;
 662     }
 663
 664     if (strncmp(system_vendor,DELL_SIGNATURE,strlen(DELL_SIGNATURE)) != 0) {
 665         printk(KERN_INFO "i8k: not running on a Dell system\n");
 666         return -ENODEV;
 667     }
 668
 669     for (p=supported_models; ; p++) {
 670         if (!*p) {
 671             printk(KERN_INFO "i8k: unsupported model: %s\n", product_name);
 672             return -ENODEV;
 673         }
 674         if (strncmp(product_name,*p,strlen(*p)) == 0) {
 675             break;
 676         }
 677     }
 678
 679     return 0;
 680 }
 681
 682 /*
 683  * Probe for the presence of a supported laptop.
 684  */
 685 static int __init i8k_probe(void)
 686 {
 687     char buff[4];
 688     int version;
 689     int smm_found = 0;
 690
 691     /*
 692      * Get DMI information
 693      */
 694     if (i8k_dmi_probe() != 0) {
 695         printk(KERN_INFO "i8k: vendor=%s, model=%s, version=%s\n",
 696                system_vendor, product_name, bios_version);
 697     }
 698
 699     /*
 700      * Get SMM Dell signature
 701      */
 702     if (i8k_get_dell_signature() != 0) {
 703         printk(KERN_INFO "i8k: unable to get SMM Dell signature\n");
 704     } else {
 705         smm_found = 1;
 706     }
 707
 708     /*
 709      * Get SMM BIOS version.
 710      */
 711     version = i8k_get_bios_version();
 712     if (version <= 0) {
 713         printk(KERN_INFO "i8k: unable to get SMM BIOS version\n");
 714     } else {
 715         smm_found = 1;
 716         buff[0] = (version >> 16) & 0xff;
 717         buff[1] = (version >>  8) & 0xff;
 718         buff[2] = (version)       & 0xff;
 719         buff[3] = '\0';
 720         /*
 721          * If DMI BIOS version is unknown use SMM BIOS version.
 722          */
 723         if (bios_version[0] == '?') {
 724             strcpy(bios_version, buff);
 725         }
 726         /*
 727          * Check if the two versions match.
 728          */
 729         if (strncmp(buff,bios_version,sizeof(bios_version)) != 0) {
 730             printk(KERN_INFO "i8k: BIOS version mismatch: %s != %s\n",
 731                    buff, bios_version);
 732         }
 733     }
 734
 735     if (!smm_found && !force) {
 736         return -ENODEV;
 737     }
 738
 739     return 0;
 740 }
 741
 742 #ifdef MODULE
 743 static
 744 #endif
 745 int __init i8k_init(void)
 746 {
 747     struct proc_dir_entry *proc_i8k;
 748
 749     /* Are we running on an supported laptop? */
 750     if (i8k_probe() != 0) {
 751         return -ENODEV;
 752     }
 753
 754     /* Register the proc entry */
 755     proc_i8k = create_proc_info_entry("i8k", 0, NULL, i8k_get_info);
 756     if (!proc_i8k) {
 757         return -ENOENT;
 758     }
 759     proc_i8k->proc_fops = &i8k_fops;
 760     SET_MODULE_OWNER(proc_i8k);
 761
 762     printk(KERN_INFO
 763            "Dell laptop SMM driver v%s Massimo Dal Zotto (dz@debian.org)\n",
 764            I8K_VERSION);
 765
 766     return 0;
 767 }
 768
 769 #ifdef MODULE
 770 int init_module(void)
 771 {
 772     return i8k_init();
 773 }
 774
 775 void cleanup_module(void)
 776 {
 777     /* Remove the proc entry */
 778     remove_proc_entry("i8k", NULL);
 779
 780     printk(KERN_INFO "i8k: module unloaded\n");
 781 }
 782 #endif
 783
 784 /* end of file */