root/drivers/hwmon/dell-smm-hwmon.c

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DEFINITIONS

This source file includes following definitions.
  1. i8k_get_dmi_data
  2. i8k_smm_func
  3. i8k_smm
  4. i8k_get_fan_status
  5. i8k_get_fan_speed
  6. _i8k_get_fan_type
  7. i8k_get_fan_type
  8. i8k_get_fan_nominal_speed
  9. i8k_set_fan
  10. i8k_get_temp_type
  11. _i8k_get_temp
  12. i8k_get_temp
  13. i8k_get_dell_signature
  14. i8k_get_fn_status
  15. i8k_get_power_status
  16. i8k_ioctl_unlocked
  17. i8k_ioctl
  18. i8k_proc_show
  19. i8k_open_fs
  20. i8k_init_procfs
  21. i8k_exit_procfs
  22. i8k_init_procfs
  23. i8k_exit_procfs
  24. i8k_hwmon_temp_label_show
  25. i8k_hwmon_temp_show
  26. i8k_hwmon_fan_label_show
  27. i8k_hwmon_fan_show
  28. i8k_hwmon_pwm_show
  29. i8k_hwmon_pwm_store
  30. i8k_is_visible
  31. i8k_init_hwmon
  32. i8k_probe
  33. i8k_init
  34. i8k_exit

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * dell-smm-hwmon.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
   4  *
   5  * Copyright (C) 2001  Massimo Dal Zotto <dz@debian.org>
   6  *
   7  * Hwmon integration:
   8  * Copyright (C) 2011  Jean Delvare <jdelvare@suse.de>
   9  * Copyright (C) 2013, 2014  Guenter Roeck <linux@roeck-us.net>
  10  * Copyright (C) 2014, 2015  Pali Rohár <pali.rohar@gmail.com>
  11  */
  12 
  13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14 
  15 #include <linux/cpu.h>
  16 #include <linux/delay.h>
  17 #include <linux/module.h>
  18 #include <linux/types.h>
  19 #include <linux/init.h>
  20 #include <linux/proc_fs.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/dmi.h>
  23 #include <linux/capability.h>
  24 #include <linux/mutex.h>
  25 #include <linux/hwmon.h>
  26 #include <linux/hwmon-sysfs.h>
  27 #include <linux/uaccess.h>
  28 #include <linux/io.h>
  29 #include <linux/sched.h>
  30 #include <linux/ctype.h>
  31 #include <linux/smp.h>
  32 
  33 #include <linux/i8k.h>
  34 
  35 #define I8K_SMM_FN_STATUS       0x0025
  36 #define I8K_SMM_POWER_STATUS    0x0069
  37 #define I8K_SMM_SET_FAN         0x01a3
  38 #define I8K_SMM_GET_FAN         0x00a3
  39 #define I8K_SMM_GET_SPEED       0x02a3
  40 #define I8K_SMM_GET_FAN_TYPE    0x03a3
  41 #define I8K_SMM_GET_NOM_SPEED   0x04a3
  42 #define I8K_SMM_GET_TEMP        0x10a3
  43 #define I8K_SMM_GET_TEMP_TYPE   0x11a3
  44 #define I8K_SMM_GET_DELL_SIG1   0xfea3
  45 #define I8K_SMM_GET_DELL_SIG2   0xffa3
  46 
  47 #define I8K_FAN_MULT            30
  48 #define I8K_FAN_MAX_RPM         30000
  49 #define I8K_MAX_TEMP            127
  50 
  51 #define I8K_FN_NONE             0x00
  52 #define I8K_FN_UP               0x01
  53 #define I8K_FN_DOWN             0x02
  54 #define I8K_FN_MUTE             0x04
  55 #define I8K_FN_MASK             0x07
  56 #define I8K_FN_SHIFT            8
  57 
  58 #define I8K_POWER_AC            0x05
  59 #define I8K_POWER_BATTERY       0x01
  60 
  61 static DEFINE_MUTEX(i8k_mutex);
  62 static char bios_version[4];
  63 static char bios_machineid[16];
  64 static struct device *i8k_hwmon_dev;
  65 static u32 i8k_hwmon_flags;
  66 static uint i8k_fan_mult = I8K_FAN_MULT;
  67 static uint i8k_pwm_mult;
  68 static uint i8k_fan_max = I8K_FAN_HIGH;
  69 static bool disallow_fan_type_call;
  70 static bool disallow_fan_support;
  71 
  72 #define I8K_HWMON_HAVE_TEMP1    (1 << 0)
  73 #define I8K_HWMON_HAVE_TEMP2    (1 << 1)
  74 #define I8K_HWMON_HAVE_TEMP3    (1 << 2)
  75 #define I8K_HWMON_HAVE_TEMP4    (1 << 3)
  76 #define I8K_HWMON_HAVE_TEMP5    (1 << 4)
  77 #define I8K_HWMON_HAVE_TEMP6    (1 << 5)
  78 #define I8K_HWMON_HAVE_TEMP7    (1 << 6)
  79 #define I8K_HWMON_HAVE_TEMP8    (1 << 7)
  80 #define I8K_HWMON_HAVE_TEMP9    (1 << 8)
  81 #define I8K_HWMON_HAVE_TEMP10   (1 << 9)
  82 #define I8K_HWMON_HAVE_FAN1     (1 << 10)
  83 #define I8K_HWMON_HAVE_FAN2     (1 << 11)
  84 #define I8K_HWMON_HAVE_FAN3     (1 << 12)
  85 
  86 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
  87 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
  88 MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver");
  89 MODULE_LICENSE("GPL");
  90 MODULE_ALIAS("i8k");
  91 
  92 static bool force;
  93 module_param(force, bool, 0);
  94 MODULE_PARM_DESC(force, "Force loading without checking for supported models");
  95 
  96 static bool ignore_dmi;
  97 module_param(ignore_dmi, bool, 0);
  98 MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
  99 
 100 #if IS_ENABLED(CONFIG_I8K)
 101 static bool restricted = true;
 102 module_param(restricted, bool, 0);
 103 MODULE_PARM_DESC(restricted, "Restrict fan control and serial number to CAP_SYS_ADMIN (default: 1)");
 104 
 105 static bool power_status;
 106 module_param(power_status, bool, 0600);
 107 MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k (default: 0)");
 108 #endif
 109 
 110 static uint fan_mult;
 111 module_param(fan_mult, uint, 0);
 112 MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)");
 113 
 114 static uint fan_max;
 115 module_param(fan_max, uint, 0);
 116 MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)");
 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_func(void *par)
 138 {
 139         int rc;
 140         struct smm_regs *regs = par;
 141         int eax = regs->eax;
 142 
 143 #ifdef DEBUG
 144         int ebx = regs->ebx;
 145         unsigned long duration;
 146         ktime_t calltime, delta, rettime;
 147 
 148         calltime = ktime_get();
 149 #endif
 150 
 151         /* SMM requires CPU 0 */
 152         if (smp_processor_id() != 0)
 153                 return -EBUSY;
 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 #ifdef DEBUG
 212         rettime = ktime_get();
 213         delta = ktime_sub(rettime, calltime);
 214         duration = ktime_to_ns(delta) >> 10;
 215         pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x  (took %7lu usecs)\n", eax, ebx,
 216                 (rc ? 0xffff : regs->eax & 0xffff), duration);
 217 #endif
 218 
 219         return rc;
 220 }
 221 
 222 /*
 223  * Call the System Management Mode BIOS.
 224  */
 225 static int i8k_smm(struct smm_regs *regs)
 226 {
 227         int ret;
 228 
 229         get_online_cpus();
 230         ret = smp_call_on_cpu(0, i8k_smm_func, regs, true);
 231         put_online_cpus();
 232 
 233         return ret;
 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         if (disallow_fan_support)
 244                 return -EINVAL;
 245 
 246         regs.ebx = fan & 0xff;
 247         return i8k_smm(&regs) ? : regs.eax & 0xff;
 248 }
 249 
 250 /*
 251  * Read the fan speed in RPM.
 252  */
 253 static int i8k_get_fan_speed(int fan)
 254 {
 255         struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
 256 
 257         if (disallow_fan_support)
 258                 return -EINVAL;
 259 
 260         regs.ebx = fan & 0xff;
 261         return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
 262 }
 263 
 264 /*
 265  * Read the fan type.
 266  */
 267 static int _i8k_get_fan_type(int fan)
 268 {
 269         struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, };
 270 
 271         if (disallow_fan_support || disallow_fan_type_call)
 272                 return -EINVAL;
 273 
 274         regs.ebx = fan & 0xff;
 275         return i8k_smm(&regs) ? : regs.eax & 0xff;
 276 }
 277 
 278 static int i8k_get_fan_type(int fan)
 279 {
 280         /* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */
 281         static int types[3] = { INT_MIN, INT_MIN, INT_MIN };
 282 
 283         if (types[fan] == INT_MIN)
 284                 types[fan] = _i8k_get_fan_type(fan);
 285 
 286         return types[fan];
 287 }
 288 
 289 /*
 290  * Read the fan nominal rpm for specific fan speed.
 291  */
 292 static int i8k_get_fan_nominal_speed(int fan, int speed)
 293 {
 294         struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, };
 295 
 296         if (disallow_fan_support)
 297                 return -EINVAL;
 298 
 299         regs.ebx = (fan & 0xff) | (speed << 8);
 300         return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
 301 }
 302 
 303 /*
 304  * Set the fan speed (off, low, high). Returns the new fan status.
 305  */
 306 static int i8k_set_fan(int fan, int speed)
 307 {
 308         struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
 309 
 310         if (disallow_fan_support)
 311                 return -EINVAL;
 312 
 313         speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed);
 314         regs.ebx = (fan & 0xff) | (speed << 8);
 315 
 316         return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
 317 }
 318 
 319 static int i8k_get_temp_type(int sensor)
 320 {
 321         struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, };
 322 
 323         regs.ebx = sensor & 0xff;
 324         return i8k_smm(&regs) ? : regs.eax & 0xff;
 325 }
 326 
 327 /*
 328  * Read the cpu temperature.
 329  */
 330 static int _i8k_get_temp(int sensor)
 331 {
 332         struct smm_regs regs = {
 333                 .eax = I8K_SMM_GET_TEMP,
 334                 .ebx = sensor & 0xff,
 335         };
 336 
 337         return i8k_smm(&regs) ? : regs.eax & 0xff;
 338 }
 339 
 340 static int i8k_get_temp(int sensor)
 341 {
 342         int temp = _i8k_get_temp(sensor);
 343 
 344         /*
 345          * Sometimes the temperature sensor returns 0x99, which is out of range.
 346          * In this case we retry (once) before returning an error.
 347          # 1003655137 00000058 00005a4b
 348          # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
 349          # 1003655139 00000054 00005c52
 350          */
 351         if (temp == 0x99) {
 352                 msleep(100);
 353                 temp = _i8k_get_temp(sensor);
 354         }
 355         /*
 356          * Return -ENODATA for all invalid temperatures.
 357          *
 358          * Known instances are the 0x99 value as seen above as well as
 359          * 0xc1 (193), which may be returned when trying to read the GPU
 360          * temperature if the system supports a GPU and it is currently
 361          * turned off.
 362          */
 363         if (temp > I8K_MAX_TEMP)
 364                 return -ENODATA;
 365 
 366         return temp;
 367 }
 368 
 369 static int i8k_get_dell_signature(int req_fn)
 370 {
 371         struct smm_regs regs = { .eax = req_fn, };
 372         int rc;
 373 
 374         rc = i8k_smm(&regs);
 375         if (rc < 0)
 376                 return rc;
 377 
 378         return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
 379 }
 380 
 381 #if IS_ENABLED(CONFIG_I8K)
 382 
 383 /*
 384  * Read the Fn key status.
 385  */
 386 static int i8k_get_fn_status(void)
 387 {
 388         struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
 389         int rc;
 390 
 391         rc = i8k_smm(&regs);
 392         if (rc < 0)
 393                 return rc;
 394 
 395         switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
 396         case I8K_FN_UP:
 397                 return I8K_VOL_UP;
 398         case I8K_FN_DOWN:
 399                 return I8K_VOL_DOWN;
 400         case I8K_FN_MUTE:
 401                 return I8K_VOL_MUTE;
 402         default:
 403                 return 0;
 404         }
 405 }
 406 
 407 /*
 408  * Read the power status.
 409  */
 410 static int i8k_get_power_status(void)
 411 {
 412         struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
 413         int rc;
 414 
 415         rc = i8k_smm(&regs);
 416         if (rc < 0)
 417                 return rc;
 418 
 419         return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
 420 }
 421 
 422 /*
 423  * Procfs interface
 424  */
 425 
 426 static int
 427 i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
 428 {
 429         int val = 0;
 430         int speed;
 431         unsigned char buff[16];
 432         int __user *argp = (int __user *)arg;
 433 
 434         if (!argp)
 435                 return -EINVAL;
 436 
 437         switch (cmd) {
 438         case I8K_BIOS_VERSION:
 439                 if (!isdigit(bios_version[0]) || !isdigit(bios_version[1]) ||
 440                     !isdigit(bios_version[2]))
 441                         return -EINVAL;
 442 
 443                 val = (bios_version[0] << 16) |
 444                                 (bios_version[1] << 8) | bios_version[2];
 445                 break;
 446 
 447         case I8K_MACHINE_ID:
 448                 if (restricted && !capable(CAP_SYS_ADMIN))
 449                         return -EPERM;
 450 
 451                 memset(buff, 0, sizeof(buff));
 452                 strlcpy(buff, bios_machineid, sizeof(buff));
 453                 break;
 454 
 455         case I8K_FN_STATUS:
 456                 val = i8k_get_fn_status();
 457                 break;
 458 
 459         case I8K_POWER_STATUS:
 460                 val = i8k_get_power_status();
 461                 break;
 462 
 463         case I8K_GET_TEMP:
 464                 val = i8k_get_temp(0);
 465                 break;
 466 
 467         case I8K_GET_SPEED:
 468                 if (copy_from_user(&val, argp, sizeof(int)))
 469                         return -EFAULT;
 470 
 471                 val = i8k_get_fan_speed(val);
 472                 break;
 473 
 474         case I8K_GET_FAN:
 475                 if (copy_from_user(&val, argp, sizeof(int)))
 476                         return -EFAULT;
 477 
 478                 val = i8k_get_fan_status(val);
 479                 break;
 480 
 481         case I8K_SET_FAN:
 482                 if (restricted && !capable(CAP_SYS_ADMIN))
 483                         return -EPERM;
 484 
 485                 if (copy_from_user(&val, argp, sizeof(int)))
 486                         return -EFAULT;
 487 
 488                 if (copy_from_user(&speed, argp + 1, sizeof(int)))
 489                         return -EFAULT;
 490 
 491                 val = i8k_set_fan(val, speed);
 492                 break;
 493 
 494         default:
 495                 return -EINVAL;
 496         }
 497 
 498         if (val < 0)
 499                 return val;
 500 
 501         switch (cmd) {
 502         case I8K_BIOS_VERSION:
 503                 if (copy_to_user(argp, &val, 4))
 504                         return -EFAULT;
 505 
 506                 break;
 507         case I8K_MACHINE_ID:
 508                 if (copy_to_user(argp, buff, 16))
 509                         return -EFAULT;
 510 
 511                 break;
 512         default:
 513                 if (copy_to_user(argp, &val, sizeof(int)))
 514                         return -EFAULT;
 515 
 516                 break;
 517         }
 518 
 519         return 0;
 520 }
 521 
 522 static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
 523 {
 524         long ret;
 525 
 526         mutex_lock(&i8k_mutex);
 527         ret = i8k_ioctl_unlocked(fp, cmd, arg);
 528         mutex_unlock(&i8k_mutex);
 529 
 530         return ret;
 531 }
 532 
 533 /*
 534  * Print the information for /proc/i8k.
 535  */
 536 static int i8k_proc_show(struct seq_file *seq, void *offset)
 537 {
 538         int fn_key, cpu_temp, ac_power;
 539         int left_fan, right_fan, left_speed, right_speed;
 540 
 541         cpu_temp        = i8k_get_temp(0);                      /* 11100 µs */
 542         left_fan        = i8k_get_fan_status(I8K_FAN_LEFT);     /*   580 µs */
 543         right_fan       = i8k_get_fan_status(I8K_FAN_RIGHT);    /*   580 µs */
 544         left_speed      = i8k_get_fan_speed(I8K_FAN_LEFT);      /*   580 µs */
 545         right_speed     = i8k_get_fan_speed(I8K_FAN_RIGHT);     /*   580 µs */
 546         fn_key          = i8k_get_fn_status();                  /*   750 µs */
 547         if (power_status)
 548                 ac_power = i8k_get_power_status();              /* 14700 µs */
 549         else
 550                 ac_power = -1;
 551 
 552         /*
 553          * Info:
 554          *
 555          * 1)  Format version (this will change if format changes)
 556          * 2)  BIOS version
 557          * 3)  BIOS machine ID
 558          * 4)  Cpu temperature
 559          * 5)  Left fan status
 560          * 6)  Right fan status
 561          * 7)  Left fan speed
 562          * 8)  Right fan speed
 563          * 9)  AC power
 564          * 10) Fn Key status
 565          */
 566         seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
 567                    I8K_PROC_FMT,
 568                    bios_version,
 569                    (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : bios_machineid,
 570                    cpu_temp,
 571                    left_fan, right_fan, left_speed, right_speed,
 572                    ac_power, fn_key);
 573 
 574         return 0;
 575 }
 576 
 577 static int i8k_open_fs(struct inode *inode, struct file *file)
 578 {
 579         return single_open(file, i8k_proc_show, NULL);
 580 }
 581 
 582 static const struct file_operations i8k_fops = {
 583         .owner          = THIS_MODULE,
 584         .open           = i8k_open_fs,
 585         .read           = seq_read,
 586         .llseek         = seq_lseek,
 587         .release        = single_release,
 588         .unlocked_ioctl = i8k_ioctl,
 589 };
 590 
 591 static void __init i8k_init_procfs(void)
 592 {
 593         /* Register the proc entry */
 594         proc_create("i8k", 0, NULL, &i8k_fops);
 595 }
 596 
 597 static void __exit i8k_exit_procfs(void)
 598 {
 599         remove_proc_entry("i8k", NULL);
 600 }
 601 
 602 #else
 603 
 604 static inline void __init i8k_init_procfs(void)
 605 {
 606 }
 607 
 608 static inline void __exit i8k_exit_procfs(void)
 609 {
 610 }
 611 
 612 #endif
 613 
 614 /*
 615  * Hwmon interface
 616  */
 617 
 618 static ssize_t i8k_hwmon_temp_label_show(struct device *dev,
 619                                          struct device_attribute *devattr,
 620                                          char *buf)
 621 {
 622         static const char * const labels[] = {
 623                 "CPU",
 624                 "GPU",
 625                 "SODIMM",
 626                 "Other",
 627                 "Ambient",
 628                 "Other",
 629         };
 630         int index = to_sensor_dev_attr(devattr)->index;
 631         int type;
 632 
 633         type = i8k_get_temp_type(index);
 634         if (type < 0)
 635                 return type;
 636         if (type >= ARRAY_SIZE(labels))
 637                 type = ARRAY_SIZE(labels) - 1;
 638         return sprintf(buf, "%s\n", labels[type]);
 639 }
 640 
 641 static ssize_t i8k_hwmon_temp_show(struct device *dev,
 642                                    struct device_attribute *devattr,
 643                                    char *buf)
 644 {
 645         int index = to_sensor_dev_attr(devattr)->index;
 646         int temp;
 647 
 648         temp = i8k_get_temp(index);
 649         if (temp < 0)
 650                 return temp;
 651         return sprintf(buf, "%d\n", temp * 1000);
 652 }
 653 
 654 static ssize_t i8k_hwmon_fan_label_show(struct device *dev,
 655                                         struct device_attribute *devattr,
 656                                         char *buf)
 657 {
 658         static const char * const labels[] = {
 659                 "Processor Fan",
 660                 "Motherboard Fan",
 661                 "Video Fan",
 662                 "Power Supply Fan",
 663                 "Chipset Fan",
 664                 "Other Fan",
 665         };
 666         int index = to_sensor_dev_attr(devattr)->index;
 667         bool dock = false;
 668         int type;
 669 
 670         type = i8k_get_fan_type(index);
 671         if (type < 0)
 672                 return type;
 673 
 674         if (type & 0x10) {
 675                 dock = true;
 676                 type &= 0x0F;
 677         }
 678 
 679         if (type >= ARRAY_SIZE(labels))
 680                 type = (ARRAY_SIZE(labels) - 1);
 681 
 682         return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]);
 683 }
 684 
 685 static ssize_t i8k_hwmon_fan_show(struct device *dev,
 686                                   struct device_attribute *devattr, char *buf)
 687 {
 688         int index = to_sensor_dev_attr(devattr)->index;
 689         int fan_speed;
 690 
 691         fan_speed = i8k_get_fan_speed(index);
 692         if (fan_speed < 0)
 693                 return fan_speed;
 694         return sprintf(buf, "%d\n", fan_speed);
 695 }
 696 
 697 static ssize_t i8k_hwmon_pwm_show(struct device *dev,
 698                                   struct device_attribute *devattr, char *buf)
 699 {
 700         int index = to_sensor_dev_attr(devattr)->index;
 701         int status;
 702 
 703         status = i8k_get_fan_status(index);
 704         if (status < 0)
 705                 return -EIO;
 706         return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255));
 707 }
 708 
 709 static ssize_t i8k_hwmon_pwm_store(struct device *dev,
 710                                    struct device_attribute *attr,
 711                                    const char *buf, size_t count)
 712 {
 713         int index = to_sensor_dev_attr(attr)->index;
 714         unsigned long val;
 715         int err;
 716 
 717         err = kstrtoul(buf, 10, &val);
 718         if (err)
 719                 return err;
 720         val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max);
 721 
 722         mutex_lock(&i8k_mutex);
 723         err = i8k_set_fan(index, val);
 724         mutex_unlock(&i8k_mutex);
 725 
 726         return err < 0 ? -EIO : count;
 727 }
 728 
 729 static SENSOR_DEVICE_ATTR_RO(temp1_input, i8k_hwmon_temp, 0);
 730 static SENSOR_DEVICE_ATTR_RO(temp1_label, i8k_hwmon_temp_label, 0);
 731 static SENSOR_DEVICE_ATTR_RO(temp2_input, i8k_hwmon_temp, 1);
 732 static SENSOR_DEVICE_ATTR_RO(temp2_label, i8k_hwmon_temp_label, 1);
 733 static SENSOR_DEVICE_ATTR_RO(temp3_input, i8k_hwmon_temp, 2);
 734 static SENSOR_DEVICE_ATTR_RO(temp3_label, i8k_hwmon_temp_label, 2);
 735 static SENSOR_DEVICE_ATTR_RO(temp4_input, i8k_hwmon_temp, 3);
 736 static SENSOR_DEVICE_ATTR_RO(temp4_label, i8k_hwmon_temp_label, 3);
 737 static SENSOR_DEVICE_ATTR_RO(temp5_input, i8k_hwmon_temp, 4);
 738 static SENSOR_DEVICE_ATTR_RO(temp5_label, i8k_hwmon_temp_label, 4);
 739 static SENSOR_DEVICE_ATTR_RO(temp6_input, i8k_hwmon_temp, 5);
 740 static SENSOR_DEVICE_ATTR_RO(temp6_label, i8k_hwmon_temp_label, 5);
 741 static SENSOR_DEVICE_ATTR_RO(temp7_input, i8k_hwmon_temp, 6);
 742 static SENSOR_DEVICE_ATTR_RO(temp7_label, i8k_hwmon_temp_label, 6);
 743 static SENSOR_DEVICE_ATTR_RO(temp8_input, i8k_hwmon_temp, 7);
 744 static SENSOR_DEVICE_ATTR_RO(temp8_label, i8k_hwmon_temp_label, 7);
 745 static SENSOR_DEVICE_ATTR_RO(temp9_input, i8k_hwmon_temp, 8);
 746 static SENSOR_DEVICE_ATTR_RO(temp9_label, i8k_hwmon_temp_label, 8);
 747 static SENSOR_DEVICE_ATTR_RO(temp10_input, i8k_hwmon_temp, 9);
 748 static SENSOR_DEVICE_ATTR_RO(temp10_label, i8k_hwmon_temp_label, 9);
 749 static SENSOR_DEVICE_ATTR_RO(fan1_input, i8k_hwmon_fan, 0);
 750 static SENSOR_DEVICE_ATTR_RO(fan1_label, i8k_hwmon_fan_label, 0);
 751 static SENSOR_DEVICE_ATTR_RW(pwm1, i8k_hwmon_pwm, 0);
 752 static SENSOR_DEVICE_ATTR_RO(fan2_input, i8k_hwmon_fan, 1);
 753 static SENSOR_DEVICE_ATTR_RO(fan2_label, i8k_hwmon_fan_label, 1);
 754 static SENSOR_DEVICE_ATTR_RW(pwm2, i8k_hwmon_pwm, 1);
 755 static SENSOR_DEVICE_ATTR_RO(fan3_input, i8k_hwmon_fan, 2);
 756 static SENSOR_DEVICE_ATTR_RO(fan3_label, i8k_hwmon_fan_label, 2);
 757 static SENSOR_DEVICE_ATTR_RW(pwm3, i8k_hwmon_pwm, 2);
 758 
 759 static struct attribute *i8k_attrs[] = {
 760         &sensor_dev_attr_temp1_input.dev_attr.attr,     /* 0 */
 761         &sensor_dev_attr_temp1_label.dev_attr.attr,     /* 1 */
 762         &sensor_dev_attr_temp2_input.dev_attr.attr,     /* 2 */
 763         &sensor_dev_attr_temp2_label.dev_attr.attr,     /* 3 */
 764         &sensor_dev_attr_temp3_input.dev_attr.attr,     /* 4 */
 765         &sensor_dev_attr_temp3_label.dev_attr.attr,     /* 5 */
 766         &sensor_dev_attr_temp4_input.dev_attr.attr,     /* 6 */
 767         &sensor_dev_attr_temp4_label.dev_attr.attr,     /* 7 */
 768         &sensor_dev_attr_temp5_input.dev_attr.attr,     /* 8 */
 769         &sensor_dev_attr_temp5_label.dev_attr.attr,     /* 9 */
 770         &sensor_dev_attr_temp6_input.dev_attr.attr,     /* 10 */
 771         &sensor_dev_attr_temp6_label.dev_attr.attr,     /* 11 */
 772         &sensor_dev_attr_temp7_input.dev_attr.attr,     /* 12 */
 773         &sensor_dev_attr_temp7_label.dev_attr.attr,     /* 13 */
 774         &sensor_dev_attr_temp8_input.dev_attr.attr,     /* 14 */
 775         &sensor_dev_attr_temp8_label.dev_attr.attr,     /* 15 */
 776         &sensor_dev_attr_temp9_input.dev_attr.attr,     /* 16 */
 777         &sensor_dev_attr_temp9_label.dev_attr.attr,     /* 17 */
 778         &sensor_dev_attr_temp10_input.dev_attr.attr,    /* 18 */
 779         &sensor_dev_attr_temp10_label.dev_attr.attr,    /* 19 */
 780         &sensor_dev_attr_fan1_input.dev_attr.attr,      /* 20 */
 781         &sensor_dev_attr_fan1_label.dev_attr.attr,      /* 21 */
 782         &sensor_dev_attr_pwm1.dev_attr.attr,            /* 22 */
 783         &sensor_dev_attr_fan2_input.dev_attr.attr,      /* 23 */
 784         &sensor_dev_attr_fan2_label.dev_attr.attr,      /* 24 */
 785         &sensor_dev_attr_pwm2.dev_attr.attr,            /* 25 */
 786         &sensor_dev_attr_fan3_input.dev_attr.attr,      /* 26 */
 787         &sensor_dev_attr_fan3_label.dev_attr.attr,      /* 27 */
 788         &sensor_dev_attr_pwm3.dev_attr.attr,            /* 28 */
 789         NULL
 790 };
 791 
 792 static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
 793                               int index)
 794 {
 795         if (disallow_fan_support && index >= 8)
 796                 return 0;
 797         if (disallow_fan_type_call &&
 798             (index == 9 || index == 12 || index == 15))
 799                 return 0;
 800         if (index >= 0 && index <= 1 &&
 801             !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
 802                 return 0;
 803         if (index >= 2 && index <= 3 &&
 804             !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
 805                 return 0;
 806         if (index >= 4 && index <= 5 &&
 807             !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
 808                 return 0;
 809         if (index >= 6 && index <= 7 &&
 810             !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
 811                 return 0;
 812         if (index >= 8 && index <= 9 &&
 813             !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP5))
 814                 return 0;
 815         if (index >= 10 && index <= 11 &&
 816             !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP6))
 817                 return 0;
 818         if (index >= 12 && index <= 13 &&
 819             !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP7))
 820                 return 0;
 821         if (index >= 14 && index <= 15 &&
 822             !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP8))
 823                 return 0;
 824         if (index >= 16 && index <= 17 &&
 825             !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP9))
 826                 return 0;
 827         if (index >= 18 && index <= 19 &&
 828             !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP10))
 829                 return 0;
 830 
 831         if (index >= 20 && index <= 22 &&
 832             !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
 833                 return 0;
 834         if (index >= 23 && index <= 25 &&
 835             !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
 836                 return 0;
 837         if (index >= 26 && index <= 28 &&
 838             !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN3))
 839                 return 0;
 840 
 841         return attr->mode;
 842 }
 843 
 844 static const struct attribute_group i8k_group = {
 845         .attrs = i8k_attrs,
 846         .is_visible = i8k_is_visible,
 847 };
 848 __ATTRIBUTE_GROUPS(i8k);
 849 
 850 static int __init i8k_init_hwmon(void)
 851 {
 852         int err;
 853 
 854         i8k_hwmon_flags = 0;
 855 
 856         /* CPU temperature attributes, if temperature type is OK */
 857         err = i8k_get_temp_type(0);
 858         if (err >= 0)
 859                 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1;
 860         /* check for additional temperature sensors */
 861         err = i8k_get_temp_type(1);
 862         if (err >= 0)
 863                 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2;
 864         err = i8k_get_temp_type(2);
 865         if (err >= 0)
 866                 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3;
 867         err = i8k_get_temp_type(3);
 868         if (err >= 0)
 869                 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
 870         err = i8k_get_temp_type(4);
 871         if (err >= 0)
 872                 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP5;
 873         err = i8k_get_temp_type(5);
 874         if (err >= 0)
 875                 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP6;
 876         err = i8k_get_temp_type(6);
 877         if (err >= 0)
 878                 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP7;
 879         err = i8k_get_temp_type(7);
 880         if (err >= 0)
 881                 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP8;
 882         err = i8k_get_temp_type(8);
 883         if (err >= 0)
 884                 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP9;
 885         err = i8k_get_temp_type(9);
 886         if (err >= 0)
 887                 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP10;
 888 
 889         /* First fan attributes, if fan status or type is OK */
 890         err = i8k_get_fan_status(0);
 891         if (err < 0)
 892                 err = i8k_get_fan_type(0);
 893         if (err >= 0)
 894                 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
 895 
 896         /* Second fan attributes, if fan status or type is OK */
 897         err = i8k_get_fan_status(1);
 898         if (err < 0)
 899                 err = i8k_get_fan_type(1);
 900         if (err >= 0)
 901                 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
 902 
 903         /* Third fan attributes, if fan status or type is OK */
 904         err = i8k_get_fan_status(2);
 905         if (err < 0)
 906                 err = i8k_get_fan_type(2);
 907         if (err >= 0)
 908                 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN3;
 909 
 910         i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm",
 911                                                           NULL, i8k_groups);
 912         if (IS_ERR(i8k_hwmon_dev)) {
 913                 err = PTR_ERR(i8k_hwmon_dev);
 914                 i8k_hwmon_dev = NULL;
 915                 pr_err("hwmon registration failed (%d)\n", err);
 916                 return err;
 917         }
 918         return 0;
 919 }
 920 
 921 struct i8k_config_data {
 922         uint fan_mult;
 923         uint fan_max;
 924 };
 925 
 926 enum i8k_configs {
 927         DELL_LATITUDE_D520,
 928         DELL_PRECISION_490,
 929         DELL_STUDIO,
 930         DELL_XPS,
 931 };
 932 
 933 static const struct i8k_config_data i8k_config_data[] = {
 934         [DELL_LATITUDE_D520] = {
 935                 .fan_mult = 1,
 936                 .fan_max = I8K_FAN_TURBO,
 937         },
 938         [DELL_PRECISION_490] = {
 939                 .fan_mult = 1,
 940                 .fan_max = I8K_FAN_TURBO,
 941         },
 942         [DELL_STUDIO] = {
 943                 .fan_mult = 1,
 944                 .fan_max = I8K_FAN_HIGH,
 945         },
 946         [DELL_XPS] = {
 947                 .fan_mult = 1,
 948                 .fan_max = I8K_FAN_HIGH,
 949         },
 950 };
 951 
 952 static const struct dmi_system_id i8k_dmi_table[] __initconst = {
 953         {
 954                 .ident = "Dell Inspiron",
 955                 .matches = {
 956                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
 957                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
 958                 },
 959         },
 960         {
 961                 .ident = "Dell Latitude",
 962                 .matches = {
 963                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
 964                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
 965                 },
 966         },
 967         {
 968                 .ident = "Dell Inspiron 2",
 969                 .matches = {
 970                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 971                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
 972                 },
 973         },
 974         {
 975                 .ident = "Dell Latitude D520",
 976                 .matches = {
 977                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 978                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"),
 979                 },
 980                 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520],
 981         },
 982         {
 983                 .ident = "Dell Latitude 2",
 984                 .matches = {
 985                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 986                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
 987                 },
 988         },
 989         {       /* UK Inspiron 6400  */
 990                 .ident = "Dell Inspiron 3",
 991                 .matches = {
 992                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 993                         DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
 994                 },
 995         },
 996         {
 997                 .ident = "Dell Inspiron 3",
 998                 .matches = {
 999                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1000                         DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
1001                 },
1002         },
1003         {
1004                 .ident = "Dell Precision 490",
1005                 .matches = {
1006                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1007                         DMI_MATCH(DMI_PRODUCT_NAME,
1008                                   "Precision WorkStation 490"),
1009                 },
1010                 .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490],
1011         },
1012         {
1013                 .ident = "Dell Precision",
1014                 .matches = {
1015                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1016                         DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
1017                 },
1018         },
1019         {
1020                 .ident = "Dell Vostro",
1021                 .matches = {
1022                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1023                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
1024                 },
1025         },
1026         {
1027                 .ident = "Dell XPS421",
1028                 .matches = {
1029                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1030                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
1031                 },
1032         },
1033         {
1034                 .ident = "Dell Studio",
1035                 .matches = {
1036                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1037                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
1038                 },
1039                 .driver_data = (void *)&i8k_config_data[DELL_STUDIO],
1040         },
1041         {
1042                 .ident = "Dell XPS 13",
1043                 .matches = {
1044                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1045                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS13"),
1046                 },
1047                 .driver_data = (void *)&i8k_config_data[DELL_XPS],
1048         },
1049         {
1050                 .ident = "Dell XPS M140",
1051                 .matches = {
1052                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1053                         DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
1054                 },
1055                 .driver_data = (void *)&i8k_config_data[DELL_XPS],
1056         },
1057         {
1058                 .ident = "Dell XPS 15 9560",
1059                 .matches = {
1060                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1061                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9560"),
1062                 },
1063         },
1064         {
1065                 .ident = "Dell XPS 15 9570",
1066                 .matches = {
1067                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1068                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9570"),
1069                 },
1070         },
1071         { }
1072 };
1073 
1074 MODULE_DEVICE_TABLE(dmi, i8k_dmi_table);
1075 
1076 /*
1077  * On some machines once I8K_SMM_GET_FAN_TYPE is issued then CPU fan speed
1078  * randomly going up and down due to bug in Dell SMM or BIOS. Here is blacklist
1079  * of affected Dell machines for which we disallow I8K_SMM_GET_FAN_TYPE call.
1080  * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121
1081  */
1082 static const struct dmi_system_id i8k_blacklist_fan_type_dmi_table[] __initconst = {
1083         {
1084                 .ident = "Dell Studio XPS 8000",
1085                 .matches = {
1086                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1087                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000"),
1088                 },
1089         },
1090         {
1091                 .ident = "Dell Studio XPS 8100",
1092                 .matches = {
1093                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1094                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"),
1095                 },
1096         },
1097         {
1098                 .ident = "Dell Inspiron 580",
1099                 .matches = {
1100                         DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1101                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 580 "),
1102                 },
1103         },
1104         { }
1105 };
1106 
1107 /*
1108  * On some machines all fan related SMM functions implemented by Dell BIOS
1109  * firmware freeze kernel for about 500ms. Until Dell fixes these problems fan
1110  * support for affected blacklisted Dell machines stay disabled.
1111  * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=195751
1112  */
1113 static struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initdata = {
1114         {
1115                 .ident = "Dell Inspiron 7720",
1116                 .matches = {
1117                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1118                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
1119                 },
1120         },
1121         {
1122                 .ident = "Dell Vostro 3360",
1123                 .matches = {
1124                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1125                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
1126                 },
1127         },
1128         {
1129                 .ident = "Dell XPS13 9333",
1130                 .matches = {
1131                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1132                         DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
1133                 },
1134         },
1135         { }
1136 };
1137 
1138 /*
1139  * Probe for the presence of a supported laptop.
1140  */
1141 static int __init i8k_probe(void)
1142 {
1143         const struct dmi_system_id *id;
1144         int fan, ret;
1145 
1146         /*
1147          * Get DMI information
1148          */
1149         if (!dmi_check_system(i8k_dmi_table)) {
1150                 if (!ignore_dmi && !force)
1151                         return -ENODEV;
1152 
1153                 pr_info("not running on a supported Dell system.\n");
1154                 pr_info("vendor=%s, model=%s, version=%s\n",
1155                         i8k_get_dmi_data(DMI_SYS_VENDOR),
1156                         i8k_get_dmi_data(DMI_PRODUCT_NAME),
1157                         i8k_get_dmi_data(DMI_BIOS_VERSION));
1158         }
1159 
1160         if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) {
1161                 pr_warn("broken Dell BIOS detected, disallow fan support\n");
1162                 if (!force)
1163                         disallow_fan_support = true;
1164         }
1165 
1166         if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) {
1167                 pr_warn("broken Dell BIOS detected, disallow fan type call\n");
1168                 if (!force)
1169                         disallow_fan_type_call = true;
1170         }
1171 
1172         strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
1173                 sizeof(bios_version));
1174         strlcpy(bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
1175                 sizeof(bios_machineid));
1176 
1177         /*
1178          * Get SMM Dell signature
1179          */
1180         if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
1181             i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
1182                 pr_err("unable to get SMM Dell signature\n");
1183                 if (!force)
1184                         return -ENODEV;
1185         }
1186 
1187         /*
1188          * Set fan multiplier and maximal fan speed from dmi config
1189          * Values specified in module parameters override values from dmi
1190          */
1191         id = dmi_first_match(i8k_dmi_table);
1192         if (id && id->driver_data) {
1193                 const struct i8k_config_data *conf = id->driver_data;
1194                 if (!fan_mult && conf->fan_mult)
1195                         fan_mult = conf->fan_mult;
1196                 if (!fan_max && conf->fan_max)
1197                         fan_max = conf->fan_max;
1198         }
1199 
1200         i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */
1201         i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);
1202 
1203         if (!fan_mult) {
1204                 /*
1205                  * Autodetect fan multiplier based on nominal rpm
1206                  * If fan reports rpm value too high then set multiplier to 1
1207                  */
1208                 for (fan = 0; fan < 2; ++fan) {
1209                         ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max);
1210                         if (ret < 0)
1211                                 continue;
1212                         if (ret > I8K_FAN_MAX_RPM)
1213                                 i8k_fan_mult = 1;
1214                         break;
1215                 }
1216         } else {
1217                 /* Fan multiplier was specified in module param or in dmi */
1218                 i8k_fan_mult = fan_mult;
1219         }
1220 
1221         return 0;
1222 }
1223 
1224 static int __init i8k_init(void)
1225 {
1226         int err;
1227 
1228         /* Are we running on an supported laptop? */
1229         if (i8k_probe())
1230                 return -ENODEV;
1231 
1232         err = i8k_init_hwmon();
1233         if (err)
1234                 return err;
1235 
1236         i8k_init_procfs();
1237         return 0;
1238 }
1239 
1240 static void __exit i8k_exit(void)
1241 {
1242         hwmon_device_unregister(i8k_hwmon_dev);
1243         i8k_exit_procfs();
1244 }
1245 
1246 module_init(i8k_init);
1247 module_exit(i8k_exit);

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