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