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  * Hwmon integration:
   9  * Copyright (C) 2011  Jean Delvare <khali@linux-fr.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify it
  12  * under the terms of the GNU General Public License as published by the
  13  * Free Software Foundation; either version 2, or (at your option) any
  14  * later version.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/types.h>
  24 #include <linux/init.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/seq_file.h>
  27 #include <linux/dmi.h>
  28 #include <linux/capability.h>
  29 #include <linux/mutex.h>
  30 #include <linux/hwmon.h>
  31 #include <linux/hwmon-sysfs.h>
  32 #include <asm/uaccess.h>
  33 #include <asm/io.h>
  34
  35 #include <linux/i8k.h>
  36
  37 #define I8K_VERSION             "1.14 21/02/2005"
  38
  39 #define I8K_SMM_FN_STATUS       0x0025
  40 #define I8K_SMM_POWER_STATUS    0x0069
  41 #define I8K_SMM_SET_FAN         0x01a3
  42 #define I8K_SMM_GET_FAN         0x00a3
  43 #define I8K_SMM_GET_SPEED       0x02a3
  44 #define I8K_SMM_GET_TEMP        0x10a3
  45 #define I8K_SMM_GET_DELL_SIG1   0xfea3
  46 #define I8K_SMM_GET_DELL_SIG2   0xffa3
  47 #define I8K_SMM_BIOS_VERSION    0x00a6
  48
  49 #define I8K_FAN_MULT            30
  50 #define I8K_MAX_TEMP            127
  51
  52 #define I8K_FN_NONE             0x00
  53 #define I8K_FN_UP               0x01
  54 #define I8K_FN_DOWN             0x02
  55 #define I8K_FN_MUTE             0x04
  56 #define I8K_FN_MASK             0x07
  57 #define I8K_FN_SHIFT            8
  58
  59 #define I8K_POWER_AC            0x05
  60 #define I8K_POWER_BATTERY       0x01
  61
  62 #define I8K_TEMPERATURE_BUG     1
  63
  64 static DEFINE_MUTEX(i8k_mutex);
  65 static char bios_version[4];
  66 static char bios_machineid[16];
  67 static struct device *i8k_hwmon_dev;
  68
  69 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
  70 MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
  71 MODULE_LICENSE("GPL");
  72
  73 static int force;
  74 module_param(force, bool, 0);
  75 MODULE_PARM_DESC(force, "Force loading without checking for supported models");
  76
  77 static int ignore_dmi;
  78 module_param(ignore_dmi, bool, 0);
  79 MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
  80
  81 static int restricted = true;
  82 module_param(restricted, bool, 0);
  83 MODULE_PARM_DESC(restricted, "Restrict fan control and serial number to CAP_SYS_ADMIN (default: 1)");
  84
  85 static int power_status;
  86 module_param(power_status, bool, 0600);
  87 MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k (default: 0)");
  88
  89 static int fan_mult = I8K_FAN_MULT;
  90 module_param(fan_mult, int, 0);
  91 MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with");
  92
  93 static int i8k_open_fs(struct inode *inode, struct file *file);
  94 static long i8k_ioctl(struct file *, unsigned int, unsigned long);
  95
  96 static const struct file_operations i8k_fops = {
  97         .owner          = THIS_MODULE,
  98         .open           = i8k_open_fs,
  99         .read           = seq_read,
 100         .llseek         = seq_lseek,
 101         .release        = single_release,
 102         .unlocked_ioctl = i8k_ioctl,
 103 };
 104
 105 struct smm_regs {
 106         unsigned int eax;
 107         unsigned int ebx __attribute__ ((packed));
 108         unsigned int ecx __attribute__ ((packed));
 109         unsigned int edx __attribute__ ((packed));
 110         unsigned int esi __attribute__ ((packed));
 111         unsigned int edi __attribute__ ((packed));
 112 };
 113
 114 static inline const char *i8k_get_dmi_data(int field)
 115 {
 116         const char *dmi_data = dmi_get_system_info(field);
 117
 118         return dmi_data && *dmi_data ? dmi_data : "?";
 119 }
 120
 121 /*
 122  * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
 123  */
 124 static int i8k_smm(struct smm_regs *regs)
 125 {
 126         int rc;
 127         int eax = regs->eax;
 128
 129 #if defined(CONFIG_X86_64)
 130         asm volatile("pushq %%rax\n\t"
 131                 "movl 0(%%rax),%%edx\n\t"
 132                 "pushq %%rdx\n\t"
 133                 "movl 4(%%rax),%%ebx\n\t"
 134                 "movl 8(%%rax),%%ecx\n\t"
 135                 "movl 12(%%rax),%%edx\n\t"
 136                 "movl 16(%%rax),%%esi\n\t"
 137                 "movl 20(%%rax),%%edi\n\t"
 138                 "popq %%rax\n\t"
 139                 "out %%al,$0xb2\n\t"
 140                 "out %%al,$0x84\n\t"
 141                 "xchgq %%rax,(%%rsp)\n\t"
 142                 "movl %%ebx,4(%%rax)\n\t"
 143                 "movl %%ecx,8(%%rax)\n\t"
 144                 "movl %%edx,12(%%rax)\n\t"
 145                 "movl %%esi,16(%%rax)\n\t"
 146                 "movl %%edi,20(%%rax)\n\t"
 147                 "popq %%rdx\n\t"
 148                 "movl %%edx,0(%%rax)\n\t"
 149                 "pushfq\n\t"
 150                 "popq %%rax\n\t"
 151                 "andl $1,%%eax\n"
 152                 :"=a"(rc)
 153                 :    "a"(regs)
 154                 :    "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
 155 #else
 156         asm volatile("pushl %%eax\n\t"
 157             "movl 0(%%eax),%%edx\n\t"
 158             "push %%edx\n\t"
 159             "movl 4(%%eax),%%ebx\n\t"
 160             "movl 8(%%eax),%%ecx\n\t"
 161             "movl 12(%%eax),%%edx\n\t"
 162             "movl 16(%%eax),%%esi\n\t"
 163             "movl 20(%%eax),%%edi\n\t"
 164             "popl %%eax\n\t"
 165             "out %%al,$0xb2\n\t"
 166             "out %%al,$0x84\n\t"
 167             "xchgl %%eax,(%%esp)\n\t"
 168             "movl %%ebx,4(%%eax)\n\t"
 169             "movl %%ecx,8(%%eax)\n\t"
 170             "movl %%edx,12(%%eax)\n\t"
 171             "movl %%esi,16(%%eax)\n\t"
 172             "movl %%edi,20(%%eax)\n\t"
 173             "popl %%edx\n\t"
 174             "movl %%edx,0(%%eax)\n\t"
 175             "lahf\n\t"
 176             "shrl $8,%%eax\n\t"
 177             "andl $1,%%eax\n"
 178             :"=a"(rc)
 179             :    "a"(regs)
 180             :    "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
 181 #endif
 182         if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
 183                 return -EINVAL;
 184
 185         return 0;
 186 }
 187
 188 /*
 189  * Read the bios version. Return the version as an integer corresponding
 190  * to the ascii value, for example "A17" is returned as 0x00413137.
 191  */
 192 static int i8k_get_bios_version(void)
 193 {
 194         struct smm_regs regs = { .eax = I8K_SMM_BIOS_VERSION, };
 195
 196         return i8k_smm(&regs) ? : regs.eax;
 197 }
 198
 199 /*
 200  * Read the Fn key status.
 201  */
 202 static int i8k_get_fn_status(void)
 203 {
 204         struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
 205         int rc;
 206
 207         if ((rc = i8k_smm(&regs)) < 0)
 208                 return rc;
 209
 210         switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
 211         case I8K_FN_UP:
 212                 return I8K_VOL_UP;
 213         case I8K_FN_DOWN:
 214                 return I8K_VOL_DOWN;
 215         case I8K_FN_MUTE:
 216                 return I8K_VOL_MUTE;
 217         default:
 218                 return 0;
 219         }
 220 }
 221
 222 /*
 223  * Read the power status.
 224  */
 225 static int i8k_get_power_status(void)
 226 {
 227         struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
 228         int rc;
 229
 230         if ((rc = i8k_smm(&regs)) < 0)
 231                 return rc;
 232
 233         return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
 234 }
 235
 236 /*
 237  * Read the fan status.
 238  */
 239 static int i8k_get_fan_status(int fan)
 240 {
 241         struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
 242
 243         regs.ebx = fan & 0xff;
 244         return i8k_smm(&regs) ? : regs.eax & 0xff;
 245 }
 246
 247 /*
 248  * Read the fan speed in RPM.
 249  */
 250 static int i8k_get_fan_speed(int fan)
 251 {
 252         struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
 253
 254         regs.ebx = fan & 0xff;
 255         return i8k_smm(&regs) ? : (regs.eax & 0xffff) * fan_mult;
 256 }
 257
 258 /*
 259  * Set the fan speed (off, low, high). Returns the new fan status.
 260  */
 261 static int i8k_set_fan(int fan, int speed)
 262 {
 263         struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
 264
 265         speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);
 266         regs.ebx = (fan & 0xff) | (speed << 8);
 267
 268         return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
 269 }
 270
 271 /*
 272  * Read the cpu temperature.
 273  */
 274 static int i8k_get_temp(int sensor)
 275 {
 276         struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, };
 277         int rc;
 278         int temp;
 279
 280 #ifdef I8K_TEMPERATURE_BUG
 281         static int prev;
 282 #endif
 283         regs.ebx = sensor & 0xff;
 284         if ((rc = i8k_smm(&regs)) < 0)
 285                 return rc;
 286
 287         temp = regs.eax & 0xff;
 288
 289 #ifdef I8K_TEMPERATURE_BUG
 290         /*
 291          * Sometimes the temperature sensor returns 0x99, which is out of range.
 292          * In this case we return (once) the previous cached value. For example:
 293          # 1003655137 00000058 00005a4b
 294          # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
 295          # 1003655139 00000054 00005c52
 296          */
 297         if (temp > I8K_MAX_TEMP) {
 298                 temp = prev;
 299                 prev = I8K_MAX_TEMP;
 300         } else {
 301                 prev = temp;
 302         }
 303 #endif
 304
 305         return temp;
 306 }
 307
 308 static int i8k_get_dell_signature(int req_fn)
 309 {
 310         struct smm_regs regs = { .eax = req_fn, };
 311         int rc;
 312
 313         if ((rc = i8k_smm(&regs)) < 0)
 314                 return rc;
 315
 316         return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
 317 }
 318
 319 static int
 320 i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
 321 {
 322         int val = 0;
 323         int speed;
 324         unsigned char buff[16];
 325         int __user *argp = (int __user *)arg;
 326
 327         if (!argp)
 328                 return -EINVAL;
 329
 330         switch (cmd) {
 331         case I8K_BIOS_VERSION:
 332                 val = i8k_get_bios_version();
 333                 break;
 334
 335         case I8K_MACHINE_ID:
 336                 if (restricted && !capable(CAP_SYS_ADMIN))
 337                         return -EPERM;
 338
 339                 memset(buff, 0, sizeof(buff));
 340                 strlcpy(buff, bios_machineid, sizeof(buff));
 341                 break;
 342
 343         case I8K_FN_STATUS:
 344                 val = i8k_get_fn_status();
 345                 break;
 346
 347         case I8K_POWER_STATUS:
 348                 val = i8k_get_power_status();
 349                 break;
 350
 351         case I8K_GET_TEMP:
 352                 val = i8k_get_temp(0);
 353                 break;
 354
 355         case I8K_GET_SPEED:
 356                 if (copy_from_user(&val, argp, sizeof(int)))
 357                         return -EFAULT;
 358
 359                 val = i8k_get_fan_speed(val);
 360                 break;
 361
 362         case I8K_GET_FAN:
 363                 if (copy_from_user(&val, argp, sizeof(int)))
 364                         return -EFAULT;
 365
 366                 val = i8k_get_fan_status(val);
 367                 break;
 368
 369         case I8K_SET_FAN:
 370                 if (restricted && !capable(CAP_SYS_ADMIN))
 371                         return -EPERM;
 372
 373                 if (copy_from_user(&val, argp, sizeof(int)))
 374                         return -EFAULT;
 375
 376                 if (copy_from_user(&speed, argp + 1, sizeof(int)))
 377                         return -EFAULT;
 378
 379                 val = i8k_set_fan(val, speed);
 380                 break;
 381
 382         default:
 383                 return -EINVAL;
 384         }
 385
 386         if (val < 0)
 387                 return val;
 388
 389         switch (cmd) {
 390         case I8K_BIOS_VERSION:
 391                 if (copy_to_user(argp, &val, 4))
 392                         return -EFAULT;
 393
 394                 break;
 395         case I8K_MACHINE_ID:
 396                 if (copy_to_user(argp, buff, 16))
 397                         return -EFAULT;
 398
 399                 break;
 400         default:
 401                 if (copy_to_user(argp, &val, sizeof(int)))
 402                         return -EFAULT;
 403
 404                 break;
 405         }
 406
 407         return 0;
 408 }
 409
 410 static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
 411 {
 412         long ret;
 413
 414         mutex_lock(&i8k_mutex);
 415         ret = i8k_ioctl_unlocked(fp, cmd, arg);
 416         mutex_unlock(&i8k_mutex);
 417
 418         return ret;
 419 }
 420
 421 /*
 422  * Print the information for /proc/i8k.
 423  */
 424 static int i8k_proc_show(struct seq_file *seq, void *offset)
 425 {
 426         int fn_key, cpu_temp, ac_power;
 427         int left_fan, right_fan, left_speed, right_speed;
 428
 429         cpu_temp        = i8k_get_temp(0);                      /* 11100 µs */
 430         left_fan        = i8k_get_fan_status(I8K_FAN_LEFT);     /*   580 µs */
 431         right_fan       = i8k_get_fan_status(I8K_FAN_RIGHT);    /*   580 µs */
 432         left_speed      = i8k_get_fan_speed(I8K_FAN_LEFT);      /*   580 µs */
 433         right_speed     = i8k_get_fan_speed(I8K_FAN_RIGHT);     /*   580 µs */
 434         fn_key          = i8k_get_fn_status();                  /*   750 µs */
 435         if (power_status)
 436                 ac_power = i8k_get_power_status();              /* 14700 µs */
 437         else
 438                 ac_power = -1;
 439
 440         /*
 441          * Info:
 442          *
 443          * 1)  Format version (this will change if format changes)
 444          * 2)  BIOS version
 445          * 3)  BIOS machine ID
 446          * 4)  Cpu temperature
 447          * 5)  Left fan status
 448          * 6)  Right fan status
 449          * 7)  Left fan speed
 450          * 8)  Right fan speed
 451          * 9)  AC power
 452          * 10) Fn Key status
 453          */
 454         return seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
 455                           I8K_PROC_FMT,
 456                           bios_version,
 457                           (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : bios_machineid,
 458                           cpu_temp,
 459                           left_fan, right_fan, left_speed, right_speed,
 460                           ac_power, fn_key);
 461 }
 462
 463 static int i8k_open_fs(struct inode *inode, struct file *file)
 464 {
 465         return single_open(file, i8k_proc_show, NULL);
 466 }
 467
 468
 469 /*
 470  * Hwmon interface
 471  */
 472
 473 static ssize_t i8k_hwmon_show_temp(struct device *dev,
 474                                    struct device_attribute *devattr,
 475                                    char *buf)
 476 {
 477         int cpu_temp;
 478
 479         cpu_temp = i8k_get_temp(0);
 480         if (cpu_temp < 0)
 481                 return cpu_temp;
 482         return sprintf(buf, "%d\n", cpu_temp * 1000);
 483 }
 484
 485 static ssize_t i8k_hwmon_show_fan(struct device *dev,
 486                                   struct device_attribute *devattr,
 487                                   char *buf)
 488 {
 489         int index = to_sensor_dev_attr(devattr)->index;
 490         int fan_speed;
 491
 492         fan_speed = i8k_get_fan_speed(index);
 493         if (fan_speed < 0)
 494                 return fan_speed;
 495         return sprintf(buf, "%d\n", fan_speed);
 496 }
 497
 498 static ssize_t i8k_hwmon_show_label(struct device *dev,
 499                                     struct device_attribute *devattr,
 500                                     char *buf)
 501 {
 502         static const char *labels[4] = {
 503                 "i8k",
 504                 "CPU",
 505                 "Left Fan",
 506                 "Right Fan",
 507         };
 508         int index = to_sensor_dev_attr(devattr)->index;
 509
 510         return sprintf(buf, "%s\n", labels[index]);
 511 }
 512
 513 static DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL);
 514 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
 515                           I8K_FAN_LEFT);
 516 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
 517                           I8K_FAN_RIGHT);
 518 static SENSOR_DEVICE_ATTR(name, S_IRUGO, i8k_hwmon_show_label, NULL, 0);
 519 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_label, NULL, 1);
 520 static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_label, NULL, 2);
 521 static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_label, NULL, 3);
 522
 523 static void i8k_hwmon_remove_files(struct device *dev)
 524 {
 525         device_remove_file(dev, &dev_attr_temp1_input);
 526         device_remove_file(dev, &sensor_dev_attr_fan1_input.dev_attr);
 527         device_remove_file(dev, &sensor_dev_attr_fan2_input.dev_attr);
 528         device_remove_file(dev, &sensor_dev_attr_temp1_label.dev_attr);
 529         device_remove_file(dev, &sensor_dev_attr_fan1_label.dev_attr);
 530         device_remove_file(dev, &sensor_dev_attr_fan2_label.dev_attr);
 531         device_remove_file(dev, &sensor_dev_attr_name.dev_attr);
 532 }
 533
 534 static int __init i8k_init_hwmon(void)
 535 {
 536         int err;
 537
 538         i8k_hwmon_dev = hwmon_device_register(NULL);
 539         if (IS_ERR(i8k_hwmon_dev)) {
 540                 err = PTR_ERR(i8k_hwmon_dev);
 541                 i8k_hwmon_dev = NULL;
 542                 printk(KERN_ERR "i8k: hwmon registration failed (%d)\n", err);
 543                 return err;
 544         }
 545
 546         /* Required name attribute */
 547         err = device_create_file(i8k_hwmon_dev,
 548                                  &sensor_dev_attr_name.dev_attr);
 549         if (err)
 550                 goto exit_unregister;
 551
 552         /* CPU temperature attributes, if temperature reading is OK */
 553         err = i8k_get_temp(0);
 554         if (err < 0) {
 555                 dev_dbg(i8k_hwmon_dev,
 556                         "Not creating temperature attributes (%d)\n", err);
 557         } else {
 558                 err = device_create_file(i8k_hwmon_dev, &dev_attr_temp1_input);
 559                 if (err)
 560                         goto exit_remove_files;
 561                 err = device_create_file(i8k_hwmon_dev,
 562                                          &sensor_dev_attr_temp1_label.dev_attr);
 563                 if (err)
 564                         goto exit_remove_files;
 565         }
 566
 567         /* Left fan attributes, if left fan is present */
 568         err = i8k_get_fan_status(I8K_FAN_LEFT);
 569         if (err < 0) {
 570                 dev_dbg(i8k_hwmon_dev,
 571                         "Not creating %s fan attributes (%d)\n", "left", err);
 572         } else {
 573                 err = device_create_file(i8k_hwmon_dev,
 574                                          &sensor_dev_attr_fan1_input.dev_attr);
 575                 if (err)
 576                         goto exit_remove_files;
 577                 err = device_create_file(i8k_hwmon_dev,
 578                                          &sensor_dev_attr_fan1_label.dev_attr);
 579                 if (err)
 580                         goto exit_remove_files;
 581         }
 582
 583         /* Right fan attributes, if right fan is present */
 584         err = i8k_get_fan_status(I8K_FAN_RIGHT);
 585         if (err < 0) {
 586                 dev_dbg(i8k_hwmon_dev,
 587                         "Not creating %s fan attributes (%d)\n", "right", err);
 588         } else {
 589                 err = device_create_file(i8k_hwmon_dev,
 590                                          &sensor_dev_attr_fan2_input.dev_attr);
 591                 if (err)
 592                         goto exit_remove_files;
 593                 err = device_create_file(i8k_hwmon_dev,
 594                                          &sensor_dev_attr_fan2_label.dev_attr);
 595                 if (err)
 596                         goto exit_remove_files;
 597         }
 598
 599         return 0;
 600
 601  exit_remove_files:
 602         i8k_hwmon_remove_files(i8k_hwmon_dev);
 603  exit_unregister:
 604         hwmon_device_unregister(i8k_hwmon_dev);
 605         return err;
 606 }
 607
 608 static void __exit i8k_exit_hwmon(void)
 609 {
 610         i8k_hwmon_remove_files(i8k_hwmon_dev);
 611         hwmon_device_unregister(i8k_hwmon_dev);
 612 }
 613
 614 static struct dmi_system_id __initdata i8k_dmi_table[] = {
 615         {
 616                 .ident = "Dell Inspiron",
 617                 .matches = {
 618                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
 619                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
 620                 },
 621         },
 622         {
 623                 .ident = "Dell Latitude",
 624                 .matches = {
 625                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
 626                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
 627                 },
 628         },
 629         {
 630                 .ident = "Dell Inspiron 2",
 631                 .matches = {
 632                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 633                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
 634                 },
 635         },
 636         {
 637                 .ident = "Dell Latitude 2",
 638                 .matches = {
 639                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 640                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
 641                 },
 642         },
 643         {       /* UK Inspiron 6400  */
 644                 .ident = "Dell Inspiron 3",
 645                 .matches = {
 646                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 647                         DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
 648                 },
 649         },
 650         {
 651                 .ident = "Dell Inspiron 3",
 652                 .matches = {
 653                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 654                         DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
 655                 },
 656         },
 657         {
 658                 .ident = "Dell Precision",
 659                 .matches = {
 660                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 661                         DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
 662                 },
 663         },
 664         {
 665                 .ident = "Dell Vostro",
 666                 .matches = {
 667                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 668                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
 669                 },
 670         },
 671         {
 672                 .ident = "Dell XPS421",
 673                 .matches = {
 674                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 675                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
 676                 },
 677         },
 678         { }
 679 };
 680
 681 /*
 682  * Probe for the presence of a supported laptop.
 683  */
 684 static int __init i8k_probe(void)
 685 {
 686         char buff[4];
 687         int version;
 688
 689         /*
 690          * Get DMI information
 691          */
 692         if (!dmi_check_system(i8k_dmi_table)) {
 693                 if (!ignore_dmi && !force)
 694                         return -ENODEV;
 695
 696                 printk(KERN_INFO "i8k: not running on a supported Dell system.\n");
 697                 printk(KERN_INFO "i8k: vendor=%s, model=%s, version=%s\n",
 698                         i8k_get_dmi_data(DMI_SYS_VENDOR),
 699                         i8k_get_dmi_data(DMI_PRODUCT_NAME),
 700                         i8k_get_dmi_data(DMI_BIOS_VERSION));
 701         }
 702
 703         strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), sizeof(bios_version));
 704         strlcpy(bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
 705                 sizeof(bios_machineid));
 706
 707         /*
 708          * Get SMM Dell signature
 709          */
 710         if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
 711             i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
 712                 printk(KERN_ERR "i8k: unable to get SMM Dell signature\n");
 713                 if (!force)
 714                         return -ENODEV;
 715         }
 716
 717         /*
 718          * Get SMM BIOS version.
 719          */
 720         version = i8k_get_bios_version();
 721         if (version <= 0) {
 722                 printk(KERN_WARNING "i8k: unable to get SMM BIOS version\n");
 723         } else {
 724                 buff[0] = (version >> 16) & 0xff;
 725                 buff[1] = (version >> 8) & 0xff;
 726                 buff[2] = (version) & 0xff;
 727                 buff[3] = '\0';
 728                 /*
 729                  * If DMI BIOS version is unknown use SMM BIOS version.
 730                  */
 731                 if (!dmi_get_system_info(DMI_BIOS_VERSION))
 732                         strlcpy(bios_version, buff, sizeof(bios_version));
 733
 734                 /*
 735                  * Check if the two versions match.
 736                  */
 737                 if (strncmp(buff, bios_version, sizeof(bios_version)) != 0)
 738                         printk(KERN_WARNING "i8k: BIOS version mismatch: %s != %s\n",
 739                                 buff, bios_version);
 740         }
 741
 742         return 0;
 743 }
 744
 745 static int __init i8k_init(void)
 746 {
 747         struct proc_dir_entry *proc_i8k;
 748         int err;
 749
 750         /* Are we running on an supported laptop? */
 751         if (i8k_probe())
 752                 return -ENODEV;
 753
 754         /* Register the proc entry */
 755         proc_i8k = proc_create("i8k", 0, NULL, &i8k_fops);
 756         if (!proc_i8k)
 757                 return -ENOENT;
 758
 759         err = i8k_init_hwmon();
 760         if (err)
 761                 goto exit_remove_proc;
 762
 763         printk(KERN_INFO
 764                "Dell laptop SMM driver v%s Massimo Dal Zotto (dz@debian.org)\n",
 765                I8K_VERSION);
 766
 767         return 0;
 768
 769  exit_remove_proc:
 770         remove_proc_entry("i8k", NULL);
 771         return err;
 772 }
 773
 774 static void __exit i8k_exit(void)
 775 {
 776         i8k_exit_hwmon();
 777         remove_proc_entry("i8k", NULL);
 778 }
 779
 780 module_init(i8k_init);
 781 module_exit(i8k_exit);