drivers/char/i8k.c

   1 /*
   2  * i8k.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
   3  *
   4  * Copyright (C) 2001  Massimo Dal Zotto <dz@debian.org>
   5  *
   6  * Hwmon integration:
   7  * Copyright (C) 2011  Jean Delvare <jdelvare@suse.de>
   8  * Copyright (C) 2013, 2014  Guenter Roeck <linux@roeck-us.net>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by the
  12  * Free Software Foundation; either version 2, or (at your option) any
  13  * later version.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  */
  20
  21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  22
  23 #include <linux/delay.h>
  24 #include <linux/module.h>
  25 #include <linux/types.h>
  26 #include <linux/init.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/seq_file.h>
  29 #include <linux/dmi.h>
  30 #include <linux/capability.h>
  31 #include <linux/mutex.h>
  32 #include <linux/hwmon.h>
  33 #include <linux/hwmon-sysfs.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/io.h>
  36 #include <linux/sched.h>
  37
  38 #include <linux/i8k.h>
  39
  40 #define I8K_SMM_FN_STATUS       0x0025
  41 #define I8K_SMM_POWER_STATUS    0x0069
  42 #define I8K_SMM_SET_FAN         0x01a3
  43 #define I8K_SMM_GET_FAN         0x00a3
  44 #define I8K_SMM_GET_SPEED       0x02a3
  45 #define I8K_SMM_GET_TEMP        0x10a3
  46 #define I8K_SMM_GET_TEMP_TYPE   0x11a3
  47 #define I8K_SMM_GET_DELL_SIG1   0xfea3
  48 #define I8K_SMM_GET_DELL_SIG2   0xffa3
  49
  50 #define I8K_FAN_MULT            30
  51 #define I8K_MAX_TEMP            127
  52
  53 #define I8K_FN_NONE             0x00
  54 #define I8K_FN_UP               0x01
  55 #define I8K_FN_DOWN             0x02
  56 #define I8K_FN_MUTE             0x04
  57 #define I8K_FN_MASK             0x07
  58 #define I8K_FN_SHIFT            8
  59
  60 #define I8K_POWER_AC            0x05
  61 #define I8K_POWER_BATTERY       0x01
  62
  63 static DEFINE_MUTEX(i8k_mutex);
  64 static char bios_version[4];
  65 static struct device *i8k_hwmon_dev;
  66 static u32 i8k_hwmon_flags;
  67 static int i8k_fan_mult;
  68 static int i8k_pwm_mult;
  69 static int i8k_fan_max = I8K_FAN_HIGH;
  70
  71 #define I8K_HWMON_HAVE_TEMP1    (1 << 0)
  72 #define I8K_HWMON_HAVE_TEMP2    (1 << 1)
  73 #define I8K_HWMON_HAVE_TEMP3    (1 << 2)
  74 #define I8K_HWMON_HAVE_TEMP4    (1 << 3)
  75 #define I8K_HWMON_HAVE_FAN1     (1 << 4)
  76 #define I8K_HWMON_HAVE_FAN2     (1 << 5)
  77
  78 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
  79 MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
  80 MODULE_LICENSE("GPL");
  81
  82 static bool force;
  83 module_param(force, bool, 0);
  84 MODULE_PARM_DESC(force, "Force loading without checking for supported models");
  85
  86 static bool ignore_dmi;
  87 module_param(ignore_dmi, bool, 0);
  88 MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
  89
  90 static bool restricted;
  91 module_param(restricted, bool, 0);
  92 MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
  93
  94 static bool power_status;
  95 module_param(power_status, bool, 0600);
  96 MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
  97
  98 static int fan_mult = I8K_FAN_MULT;
  99 module_param(fan_mult, int, 0);
 100 MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with");
 101
 102 static int fan_max = I8K_FAN_HIGH;
 103 module_param(fan_max, int, 0);
 104 MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed");
 105
 106 static int i8k_open_fs(struct inode *inode, struct file *file);
 107 static long i8k_ioctl(struct file *, unsigned int, unsigned long);
 108
 109 static const struct file_operations i8k_fops = {
 110         .owner          = THIS_MODULE,
 111         .open           = i8k_open_fs,
 112         .read           = seq_read,
 113         .llseek         = seq_lseek,
 114         .release        = single_release,
 115         .unlocked_ioctl = i8k_ioctl,
 116 };
 117
 118 struct smm_regs {
 119         unsigned int eax;
 120         unsigned int ebx __packed;
 121         unsigned int ecx __packed;
 122         unsigned int edx __packed;
 123         unsigned int esi __packed;
 124         unsigned int edi __packed;
 125 };
 126
 127 static inline const char *i8k_get_dmi_data(int field)
 128 {
 129         const char *dmi_data = dmi_get_system_info(field);
 130
 131         return dmi_data && *dmi_data ? dmi_data : "?";
 132 }
 133
 134 /*
 135  * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
 136  */
 137 static int i8k_smm(struct smm_regs *regs)
 138 {
 139         int rc;
 140         int eax = regs->eax;
 141         cpumask_var_t old_mask;
 142
 143         /* SMM requires CPU 0 */
 144         if (!alloc_cpumask_var(&old_mask, GFP_KERNEL))
 145                 return -ENOMEM;
 146         cpumask_copy(old_mask, &current->cpus_allowed);
 147         rc = set_cpus_allowed_ptr(current, cpumask_of(0));
 148         if (rc)
 149                 goto out;
 150         if (smp_processor_id() != 0) {
 151                 rc = -EBUSY;
 152                 goto out;
 153         }
 154
 155 #if defined(CONFIG_X86_64)
 156         asm volatile("pushq %%rax\n\t"
 157                 "movl 0(%%rax),%%edx\n\t"
 158                 "pushq %%rdx\n\t"
 159                 "movl 4(%%rax),%%ebx\n\t"
 160                 "movl 8(%%rax),%%ecx\n\t"
 161                 "movl 12(%%rax),%%edx\n\t"
 162                 "movl 16(%%rax),%%esi\n\t"
 163                 "movl 20(%%rax),%%edi\n\t"
 164                 "popq %%rax\n\t"
 165                 "out %%al,$0xb2\n\t"
 166                 "out %%al,$0x84\n\t"
 167                 "xchgq %%rax,(%%rsp)\n\t"
 168                 "movl %%ebx,4(%%rax)\n\t"
 169                 "movl %%ecx,8(%%rax)\n\t"
 170                 "movl %%edx,12(%%rax)\n\t"
 171                 "movl %%esi,16(%%rax)\n\t"
 172                 "movl %%edi,20(%%rax)\n\t"
 173                 "popq %%rdx\n\t"
 174                 "movl %%edx,0(%%rax)\n\t"
 175                 "pushfq\n\t"
 176                 "popq %%rax\n\t"
 177                 "andl $1,%%eax\n"
 178                 : "=a"(rc)
 179                 :    "a"(regs)
 180                 :    "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
 181 #else
 182         asm volatile("pushl %%eax\n\t"
 183             "movl 0(%%eax),%%edx\n\t"
 184             "push %%edx\n\t"
 185             "movl 4(%%eax),%%ebx\n\t"
 186             "movl 8(%%eax),%%ecx\n\t"
 187             "movl 12(%%eax),%%edx\n\t"
 188             "movl 16(%%eax),%%esi\n\t"
 189             "movl 20(%%eax),%%edi\n\t"
 190             "popl %%eax\n\t"
 191             "out %%al,$0xb2\n\t"
 192             "out %%al,$0x84\n\t"
 193             "xchgl %%eax,(%%esp)\n\t"
 194             "movl %%ebx,4(%%eax)\n\t"
 195             "movl %%ecx,8(%%eax)\n\t"
 196             "movl %%edx,12(%%eax)\n\t"
 197             "movl %%esi,16(%%eax)\n\t"
 198             "movl %%edi,20(%%eax)\n\t"
 199             "popl %%edx\n\t"
 200             "movl %%edx,0(%%eax)\n\t"
 201             "lahf\n\t"
 202             "shrl $8,%%eax\n\t"
 203             "andl $1,%%eax\n"
 204             : "=a"(rc)
 205             :    "a"(regs)
 206             :    "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
 207 #endif
 208         if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
 209                 rc = -EINVAL;
 210
 211 out:
 212         set_cpus_allowed_ptr(current, old_mask);
 213         free_cpumask_var(old_mask);
 214         return rc;
 215 }
 216
 217 /*
 218  * Read the Fn key status.
 219  */
 220 static int i8k_get_fn_status(void)
 221 {
 222         struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
 223         int rc;
 224
 225         rc = i8k_smm(&regs);
 226         if (rc < 0)
 227                 return rc;
 228
 229         switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
 230         case I8K_FN_UP:
 231                 return I8K_VOL_UP;
 232         case I8K_FN_DOWN:
 233                 return I8K_VOL_DOWN;
 234         case I8K_FN_MUTE:
 235                 return I8K_VOL_MUTE;
 236         default:
 237                 return 0;
 238         }
 239 }
 240
 241 /*
 242  * Read the power status.
 243  */
 244 static int i8k_get_power_status(void)
 245 {
 246         struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
 247         int rc;
 248
 249         rc = i8k_smm(&regs);
 250         if (rc < 0)
 251                 return rc;
 252
 253         return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
 254 }
 255
 256 /*
 257  * Read the fan status.
 258  */
 259 static int i8k_get_fan_status(int fan)
 260 {
 261         struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
 262
 263         regs.ebx = fan & 0xff;
 264         return i8k_smm(&regs) ? : regs.eax & 0xff;
 265 }
 266
 267 /*
 268  * Read the fan speed in RPM.
 269  */
 270 static int i8k_get_fan_speed(int fan)
 271 {
 272         struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
 273
 274         regs.ebx = fan & 0xff;
 275         return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
 276 }
 277
 278 /*
 279  * Set the fan speed (off, low, high). Returns the new fan status.
 280  */
 281 static int i8k_set_fan(int fan, int speed)
 282 {
 283         struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
 284
 285         speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed);
 286         regs.ebx = (fan & 0xff) | (speed << 8);
 287
 288         return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
 289 }
 290
 291 static int i8k_get_temp_type(int sensor)
 292 {
 293         struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, };
 294
 295         regs.ebx = sensor & 0xff;
 296         return i8k_smm(&regs) ? : regs.eax & 0xff;
 297 }
 298
 299 /*
 300  * Read the cpu temperature.
 301  */
 302 static int _i8k_get_temp(int sensor)
 303 {
 304         struct smm_regs regs = {
 305                 .eax = I8K_SMM_GET_TEMP,
 306                 .ebx = sensor & 0xff,
 307         };
 308
 309         return i8k_smm(&regs) ? : regs.eax & 0xff;
 310 }
 311
 312 static int i8k_get_temp(int sensor)
 313 {
 314         int temp = _i8k_get_temp(sensor);
 315
 316         /*
 317          * Sometimes the temperature sensor returns 0x99, which is out of range.
 318          * In this case we retry (once) before returning an error.
 319          # 1003655137 00000058 00005a4b
 320          # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
 321          # 1003655139 00000054 00005c52
 322          */
 323         if (temp == 0x99) {
 324                 msleep(100);
 325                 temp = _i8k_get_temp(sensor);
 326         }
 327         /*
 328          * Return -ENODATA for all invalid temperatures.
 329          *
 330          * Known instances are the 0x99 value as seen above as well as
 331          * 0xc1 (193), which may be returned when trying to read the GPU
 332          * temperature if the system supports a GPU and it is currently
 333          * turned off.
 334          */
 335         if (temp > I8K_MAX_TEMP)
 336                 return -ENODATA;
 337
 338         return temp;
 339 }
 340
 341 static int i8k_get_dell_signature(int req_fn)
 342 {
 343         struct smm_regs regs = { .eax = req_fn, };
 344         int rc;
 345
 346         rc = i8k_smm(&regs);
 347         if (rc < 0)
 348                 return rc;
 349
 350         return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
 351 }
 352
 353 static int
 354 i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
 355 {
 356         int val = 0;
 357         int speed;
 358         unsigned char buff[16];
 359         int __user *argp = (int __user *)arg;
 360
 361         if (!argp)
 362                 return -EINVAL;
 363
 364         switch (cmd) {
 365         case I8K_BIOS_VERSION:
 366                 val = (bios_version[0] << 16) |
 367                                 (bios_version[1] << 8) | bios_version[2];
 368                 break;
 369
 370         case I8K_MACHINE_ID:
 371                 memset(buff, 0, 16);
 372                 strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
 373                         sizeof(buff));
 374                 break;
 375
 376         case I8K_FN_STATUS:
 377                 val = i8k_get_fn_status();
 378                 break;
 379
 380         case I8K_POWER_STATUS:
 381                 val = i8k_get_power_status();
 382                 break;
 383
 384         case I8K_GET_TEMP:
 385                 val = i8k_get_temp(0);
 386                 break;
 387
 388         case I8K_GET_SPEED:
 389                 if (copy_from_user(&val, argp, sizeof(int)))
 390                         return -EFAULT;
 391
 392                 val = i8k_get_fan_speed(val);
 393                 break;
 394
 395         case I8K_GET_FAN:
 396                 if (copy_from_user(&val, argp, sizeof(int)))
 397                         return -EFAULT;
 398
 399                 val = i8k_get_fan_status(val);
 400                 break;
 401
 402         case I8K_SET_FAN:
 403                 if (restricted && !capable(CAP_SYS_ADMIN))
 404                         return -EPERM;
 405
 406                 if (copy_from_user(&val, argp, sizeof(int)))
 407                         return -EFAULT;
 408
 409                 if (copy_from_user(&speed, argp + 1, sizeof(int)))
 410                         return -EFAULT;
 411
 412                 val = i8k_set_fan(val, speed);
 413                 break;
 414
 415         default:
 416                 return -EINVAL;
 417         }
 418
 419         if (val < 0)
 420                 return val;
 421
 422         switch (cmd) {
 423         case I8K_BIOS_VERSION:
 424                 if (copy_to_user(argp, &val, 4))
 425                         return -EFAULT;
 426
 427                 break;
 428         case I8K_MACHINE_ID:
 429                 if (copy_to_user(argp, buff, 16))
 430                         return -EFAULT;
 431
 432                 break;
 433         default:
 434                 if (copy_to_user(argp, &val, sizeof(int)))
 435                         return -EFAULT;
 436
 437                 break;
 438         }
 439
 440         return 0;
 441 }
 442
 443 static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
 444 {
 445         long ret;
 446
 447         mutex_lock(&i8k_mutex);
 448         ret = i8k_ioctl_unlocked(fp, cmd, arg);
 449         mutex_unlock(&i8k_mutex);
 450
 451         return ret;
 452 }
 453
 454 /*
 455  * Print the information for /proc/i8k.
 456  */
 457 static int i8k_proc_show(struct seq_file *seq, void *offset)
 458 {
 459         int fn_key, cpu_temp, ac_power;
 460         int left_fan, right_fan, left_speed, right_speed;
 461
 462         cpu_temp        = i8k_get_temp(0);                      /* 11100 µs */
 463         left_fan        = i8k_get_fan_status(I8K_FAN_LEFT);     /*   580 µs */
 464         right_fan       = i8k_get_fan_status(I8K_FAN_RIGHT);    /*   580 µs */
 465         left_speed      = i8k_get_fan_speed(I8K_FAN_LEFT);      /*   580 µs */
 466         right_speed     = i8k_get_fan_speed(I8K_FAN_RIGHT);     /*   580 µs */
 467         fn_key          = i8k_get_fn_status();                  /*   750 µs */
 468         if (power_status)
 469                 ac_power = i8k_get_power_status();              /* 14700 µs */
 470         else
 471                 ac_power = -1;
 472
 473         /*
 474          * Info:
 475          *
 476          * 1)  Format version (this will change if format changes)
 477          * 2)  BIOS version
 478          * 3)  BIOS machine ID
 479          * 4)  Cpu temperature
 480          * 5)  Left fan status
 481          * 6)  Right fan status
 482          * 7)  Left fan speed
 483          * 8)  Right fan speed
 484          * 9)  AC power
 485          * 10) Fn Key status
 486          */
 487         return seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
 488                           I8K_PROC_FMT,
 489                           bios_version,
 490                           i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
 491                           cpu_temp,
 492                           left_fan, right_fan, left_speed, right_speed,
 493                           ac_power, fn_key);
 494 }
 495
 496 static int i8k_open_fs(struct inode *inode, struct file *file)
 497 {
 498         return single_open(file, i8k_proc_show, NULL);
 499 }
 500
 501
 502 /*
 503  * Hwmon interface
 504  */
 505
 506 static ssize_t i8k_hwmon_show_temp_label(struct device *dev,
 507                                          struct device_attribute *devattr,
 508                                          char *buf)
 509 {
 510         static const char * const labels[] = {
 511                 "CPU",
 512                 "GPU",
 513                 "SODIMM",
 514                 "Other",
 515                 "Ambient",
 516                 "Other",
 517         };
 518         int index = to_sensor_dev_attr(devattr)->index;
 519         int type;
 520
 521         type = i8k_get_temp_type(index);
 522         if (type < 0)
 523                 return type;
 524         if (type >= ARRAY_SIZE(labels))
 525                 type = ARRAY_SIZE(labels) - 1;
 526         return sprintf(buf, "%s\n", labels[type]);
 527 }
 528
 529 static ssize_t i8k_hwmon_show_temp(struct device *dev,
 530                                    struct device_attribute *devattr,
 531                                    char *buf)
 532 {
 533         int index = to_sensor_dev_attr(devattr)->index;
 534         int temp;
 535
 536         temp = i8k_get_temp(index);
 537         if (temp < 0)
 538                 return temp;
 539         return sprintf(buf, "%d\n", temp * 1000);
 540 }
 541
 542 static ssize_t i8k_hwmon_show_fan(struct device *dev,
 543                                   struct device_attribute *devattr,
 544                                   char *buf)
 545 {
 546         int index = to_sensor_dev_attr(devattr)->index;
 547         int fan_speed;
 548
 549         fan_speed = i8k_get_fan_speed(index);
 550         if (fan_speed < 0)
 551                 return fan_speed;
 552         return sprintf(buf, "%d\n", fan_speed);
 553 }
 554
 555 static ssize_t i8k_hwmon_show_pwm(struct device *dev,
 556                                   struct device_attribute *devattr,
 557                                   char *buf)
 558 {
 559         int index = to_sensor_dev_attr(devattr)->index;
 560         int status;
 561
 562         status = i8k_get_fan_status(index);
 563         if (status < 0)
 564                 return -EIO;
 565         return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255));
 566 }
 567
 568 static ssize_t i8k_hwmon_set_pwm(struct device *dev,
 569                                  struct device_attribute *attr,
 570                                  const char *buf, size_t count)
 571 {
 572         int index = to_sensor_dev_attr(attr)->index;
 573         unsigned long val;
 574         int err;
 575
 576         err = kstrtoul(buf, 10, &val);
 577         if (err)
 578                 return err;
 579         val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max);
 580
 581         mutex_lock(&i8k_mutex);
 582         err = i8k_set_fan(index, val);
 583         mutex_unlock(&i8k_mutex);
 584
 585         return err < 0 ? -EIO : count;
 586 }
 587
 588 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0);
 589 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
 590                           0);
 591 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1);
 592 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
 593                           1);
 594 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2);
 595 static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
 596                           2);
 597 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3);
 598 static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
 599                           3);
 600 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
 601                           I8K_FAN_LEFT);
 602 static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
 603                           i8k_hwmon_set_pwm, I8K_FAN_LEFT);
 604 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
 605                           I8K_FAN_RIGHT);
 606 static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
 607                           i8k_hwmon_set_pwm, I8K_FAN_RIGHT);
 608
 609 static struct attribute *i8k_attrs[] = {
 610         &sensor_dev_attr_temp1_input.dev_attr.attr,     /* 0 */
 611         &sensor_dev_attr_temp1_label.dev_attr.attr,     /* 1 */
 612         &sensor_dev_attr_temp2_input.dev_attr.attr,     /* 2 */
 613         &sensor_dev_attr_temp2_label.dev_attr.attr,     /* 3 */
 614         &sensor_dev_attr_temp3_input.dev_attr.attr,     /* 4 */
 615         &sensor_dev_attr_temp3_label.dev_attr.attr,     /* 5 */
 616         &sensor_dev_attr_temp4_input.dev_attr.attr,     /* 6 */
 617         &sensor_dev_attr_temp4_label.dev_attr.attr,     /* 7 */
 618         &sensor_dev_attr_fan1_input.dev_attr.attr,      /* 8 */
 619         &sensor_dev_attr_pwm1.dev_attr.attr,            /* 9 */
 620         &sensor_dev_attr_fan2_input.dev_attr.attr,      /* 10 */
 621         &sensor_dev_attr_pwm2.dev_attr.attr,            /* 11 */
 622         NULL
 623 };
 624
 625 static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
 626                               int index)
 627 {
 628         if (index >= 0 && index <= 1 &&
 629             !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
 630                 return 0;
 631         if (index >= 2 && index <= 3 &&
 632             !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
 633                 return 0;
 634         if (index >= 4 && index <= 5 &&
 635             !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
 636                 return 0;
 637         if (index >= 6 && index <= 7 &&
 638             !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
 639                 return 0;
 640         if (index >= 8 && index <= 9 &&
 641             !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
 642                 return 0;
 643         if (index >= 10 && index <= 11 &&
 644             !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
 645                 return 0;
 646
 647         return attr->mode;
 648 }
 649
 650 static const struct attribute_group i8k_group = {
 651         .attrs = i8k_attrs,
 652         .is_visible = i8k_is_visible,
 653 };
 654 __ATTRIBUTE_GROUPS(i8k);
 655
 656 static int __init i8k_init_hwmon(void)
 657 {
 658         int err;
 659
 660         i8k_hwmon_flags = 0;
 661
 662         /* CPU temperature attributes, if temperature type is OK */
 663         err = i8k_get_temp_type(0);
 664         if (err >= 0)
 665                 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1;
 666         /* check for additional temperature sensors */
 667         err = i8k_get_temp_type(1);
 668         if (err >= 0)
 669                 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2;
 670         err = i8k_get_temp_type(2);
 671         if (err >= 0)
 672                 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3;
 673         err = i8k_get_temp_type(3);
 674         if (err >= 0)
 675                 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
 676
 677         /* Left fan attributes, if left fan is present */
 678         err = i8k_get_fan_status(I8K_FAN_LEFT);
 679         if (err >= 0)
 680                 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
 681
 682         /* Right fan attributes, if right fan is present */
 683         err = i8k_get_fan_status(I8K_FAN_RIGHT);
 684         if (err >= 0)
 685                 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
 686
 687         i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "i8k", NULL,
 688                                                           i8k_groups);
 689         if (IS_ERR(i8k_hwmon_dev)) {
 690                 err = PTR_ERR(i8k_hwmon_dev);
 691                 i8k_hwmon_dev = NULL;
 692                 pr_err("hwmon registration failed (%d)\n", err);
 693                 return err;
 694         }
 695         return 0;
 696 }
 697
 698 struct i8k_config_data {
 699         int fan_mult;
 700         int fan_max;
 701 };
 702
 703 enum i8k_configs {
 704         DELL_LATITUDE_D520,
 705         DELL_LATITUDE_E6540,
 706         DELL_PRECISION_490,
 707         DELL_STUDIO,
 708         DELL_XPS_M140,
 709 };
 710
 711 static const struct i8k_config_data i8k_config_data[] = {
 712         [DELL_LATITUDE_D520] = {
 713                 .fan_mult = 1,
 714                 .fan_max = I8K_FAN_TURBO,
 715         },
 716         [DELL_LATITUDE_E6540] = {
 717                 .fan_mult = 1,
 718                 .fan_max = I8K_FAN_HIGH,
 719         },
 720         [DELL_PRECISION_490] = {
 721                 .fan_mult = 1,
 722                 .fan_max = I8K_FAN_TURBO,
 723         },
 724         [DELL_STUDIO] = {
 725                 .fan_mult = 1,
 726                 .fan_max = I8K_FAN_HIGH,
 727         },
 728         [DELL_XPS_M140] = {
 729                 .fan_mult = 1,
 730                 .fan_max = I8K_FAN_HIGH,
 731         },
 732 };
 733
 734 static struct dmi_system_id i8k_dmi_table[] __initdata = {
 735         {
 736                 .ident = "Dell Inspiron",
 737                 .matches = {
 738                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
 739                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
 740                 },
 741         },
 742         {
 743                 .ident = "Dell Latitude",
 744                 .matches = {
 745                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
 746                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
 747                 },
 748         },
 749         {
 750                 .ident = "Dell Inspiron 2",
 751                 .matches = {
 752                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 753                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
 754                 },
 755         },
 756         {
 757                 .ident = "Dell Latitude D520",
 758                 .matches = {
 759                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 760                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"),
 761                 },
 762                 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520],
 763         },
 764         {
 765                 .ident = "Dell Latitude E6440",
 766                 .matches = {
 767                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 768                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6440"),
 769                 },
 770                 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_E6540],
 771         },
 772         {
 773                 .ident = "Dell Latitude E6540",
 774                 .matches = {
 775                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 776                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6540"),
 777                 },
 778                 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_E6540],
 779         },
 780         {
 781                 .ident = "Dell Latitude 2",
 782                 .matches = {
 783                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 784                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
 785                 },
 786         },
 787         {       /* UK Inspiron 6400  */
 788                 .ident = "Dell Inspiron 3",
 789                 .matches = {
 790                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 791                         DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
 792                 },
 793         },
 794         {
 795                 .ident = "Dell Inspiron 3",
 796                 .matches = {
 797                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 798                         DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
 799                 },
 800         },
 801         {
 802                 .ident = "Dell Precision 490",
 803                 .matches = {
 804                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 805                         DMI_MATCH(DMI_PRODUCT_NAME,
 806                                   "Precision WorkStation 490"),
 807                 },
 808                 .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490],
 809         },
 810         {
 811                 .ident = "Dell Precision",
 812                 .matches = {
 813                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 814                         DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
 815                 },
 816         },
 817         {
 818                 .ident = "Dell Vostro",
 819                 .matches = {
 820                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 821                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
 822                 },
 823         },
 824         {
 825                 .ident = "Dell XPS421",
 826                 .matches = {
 827                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 828                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
 829                 },
 830         },
 831         {
 832                 .ident = "Dell Studio",
 833                 .matches = {
 834                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 835                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
 836                 },
 837                 .driver_data = (void *)&i8k_config_data[DELL_STUDIO],
 838         },
 839         {
 840                 .ident = "Dell XPS M140",
 841                 .matches = {
 842                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 843                         DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
 844                 },
 845                 .driver_data = (void *)&i8k_config_data[DELL_XPS_M140],
 846         },
 847         { }
 848 };
 849
 850 MODULE_DEVICE_TABLE(dmi, i8k_dmi_table);
 851
 852 /*
 853  * Probe for the presence of a supported laptop.
 854  */
 855 static int __init i8k_probe(void)
 856 {
 857         const struct dmi_system_id *id;
 858
 859         /*
 860          * Get DMI information
 861          */
 862         if (!dmi_check_system(i8k_dmi_table)) {
 863                 if (!ignore_dmi && !force)
 864                         return -ENODEV;
 865
 866                 pr_info("not running on a supported Dell system.\n");
 867                 pr_info("vendor=%s, model=%s, version=%s\n",
 868                         i8k_get_dmi_data(DMI_SYS_VENDOR),
 869                         i8k_get_dmi_data(DMI_PRODUCT_NAME),
 870                         i8k_get_dmi_data(DMI_BIOS_VERSION));
 871         }
 872
 873         strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
 874                 sizeof(bios_version));
 875
 876         /*
 877          * Get SMM Dell signature
 878          */
 879         if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
 880             i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
 881                 pr_err("unable to get SMM Dell signature\n");
 882                 if (!force)
 883                         return -ENODEV;
 884         }
 885
 886         i8k_fan_mult = fan_mult;
 887         i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */
 888         id = dmi_first_match(i8k_dmi_table);
 889         if (id && id->driver_data) {
 890                 const struct i8k_config_data *conf = id->driver_data;
 891
 892                 if (fan_mult == I8K_FAN_MULT && conf->fan_mult)
 893                         i8k_fan_mult = conf->fan_mult;
 894                 if (fan_max == I8K_FAN_HIGH && conf->fan_max)
 895                         i8k_fan_max = conf->fan_max;
 896         }
 897         i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);
 898
 899         return 0;
 900 }
 901
 902 static int __init i8k_init(void)
 903 {
 904         struct proc_dir_entry *proc_i8k;
 905         int err;
 906
 907         /* Are we running on an supported laptop? */
 908         if (i8k_probe())
 909                 return -ENODEV;
 910
 911         /* Register the proc entry */
 912         proc_i8k = proc_create("i8k", 0, NULL, &i8k_fops);
 913         if (!proc_i8k)
 914                 return -ENOENT;
 915
 916         err = i8k_init_hwmon();
 917         if (err)
 918                 goto exit_remove_proc;
 919
 920         return 0;
 921
 922  exit_remove_proc:
 923         remove_proc_entry("i8k", NULL);
 924         return err;
 925 }
 926
 927 static void __exit i8k_exit(void)
 928 {
 929         hwmon_device_unregister(i8k_hwmon_dev);
 930         remove_proc_entry("i8k", NULL);
 931 }
 932
 933 module_init(i8k_init);
 934 module_exit(i8k_exit);