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 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/module.h> 24#include <linux/types.h> 25#include <linux/init.h> 26#include <linux/proc_fs.h> 27#include <linux/seq_file.h> 28#include <linux/dmi.h> 29#include <linux/capability.h> 30#include <linux/mutex.h> 31#include <linux/hwmon.h> 32#include <linux/hwmon-sysfs.h> 33#include <linux/uaccess.h> 34#include <linux/io.h> 35#include <linux/sched.h> 36 37#include <linux/i8k.h> 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 48#define I8K_FAN_MULT 30 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#define I8K_TEMPERATURE_BUG 1 62 63static DEFINE_MUTEX(i8k_mutex); 64static char bios_version[4]; 65static struct device *i8k_hwmon_dev; 66static u32 i8k_hwmon_flags; 67static int i8k_fan_mult; 68static int i8k_pwm_mult; 69static 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 78MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)"); 79MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops"); 80MODULE_LICENSE("GPL"); 81 82static bool force; 83module_param(force, bool, 0); 84MODULE_PARM_DESC(force, "Force loading without checking for supported models"); 85 86static bool ignore_dmi; 87module_param(ignore_dmi, bool, 0); 88MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match"); 89 90static bool restricted; 91module_param(restricted, bool, 0); 92MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set"); 93 94static bool power_status; 95module_param(power_status, bool, 0600); 96MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k"); 97 98static int fan_mult = I8K_FAN_MULT; 99module_param(fan_mult, int, 0); 100MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with"); 101 102static int fan_max = I8K_FAN_HIGH; 103module_param(fan_max, int, 0); 104MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed"); 105 106static int i8k_open_fs(struct inode *inode, struct file *file); 107static long i8k_ioctl(struct file *, unsigned int, unsigned long); 108 109static 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 118struct 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 127static 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 */ 137static 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, ¤t->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 211out: 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 */ 220static 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(®s); 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 */ 244static 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(®s); 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 */ 259static 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(®s) ? : regs.eax & 0xff; 265} 266 267/* 268 * Read the fan speed in RPM. 269 */ 270static 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(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult; 276} 277 278/* 279 * Set the fan speed (off, low, high). Returns the new fan status. 280 */ 281static 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(®s) ? : i8k_get_fan_status(fan); 289} 290 291/* 292 * Read the cpu temperature. 293 */ 294static int i8k_get_temp(int sensor) 295{ 296 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, }; 297 int rc; 298 int temp; 299 300#ifdef I8K_TEMPERATURE_BUG 301 static int prev[4]; 302#endif 303 regs.ebx = sensor & 0xff; 304 rc = i8k_smm(®s); 305 if (rc < 0) 306 return rc; 307 308 temp = regs.eax & 0xff; 309 310#ifdef I8K_TEMPERATURE_BUG 311 /* 312 * Sometimes the temperature sensor returns 0x99, which is out of range. 313 * In this case we return (once) the previous cached value. For example: 314 # 1003655137 00000058 00005a4b 315 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees 316 # 1003655139 00000054 00005c52 317 */ 318 if (temp > I8K_MAX_TEMP) { 319 temp = prev[sensor]; 320 prev[sensor] = I8K_MAX_TEMP; 321 } else { 322 prev[sensor] = temp; 323 } 324#endif 325 326 return temp; 327} 328 329static int i8k_get_dell_signature(int req_fn) 330{ 331 struct smm_regs regs = { .eax = req_fn, }; 332 int rc; 333 334 rc = i8k_smm(®s); 335 if (rc < 0) 336 return rc; 337 338 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1; 339} 340 341static int 342i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg) 343{ 344 int val = 0; 345 int speed; 346 unsigned char buff[16]; 347 int __user *argp = (int __user *)arg; 348 349 if (!argp) 350 return -EINVAL; 351 352 switch (cmd) { 353 case I8K_BIOS_VERSION: 354 val = (bios_version[0] << 16) | 355 (bios_version[1] << 8) | bios_version[2]; 356 break; 357 358 case I8K_MACHINE_ID: 359 memset(buff, 0, 16); 360 strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), 361 sizeof(buff)); 362 break; 363 364 case I8K_FN_STATUS: 365 val = i8k_get_fn_status(); 366 break; 367 368 case I8K_POWER_STATUS: 369 val = i8k_get_power_status(); 370 break; 371 372 case I8K_GET_TEMP: 373 val = i8k_get_temp(0); 374 break; 375 376 case I8K_GET_SPEED: 377 if (copy_from_user(&val, argp, sizeof(int))) 378 return -EFAULT; 379 380 val = i8k_get_fan_speed(val); 381 break; 382 383 case I8K_GET_FAN: 384 if (copy_from_user(&val, argp, sizeof(int))) 385 return -EFAULT; 386 387 val = i8k_get_fan_status(val); 388 break; 389 390 case I8K_SET_FAN: 391 if (restricted && !capable(CAP_SYS_ADMIN)) 392 return -EPERM; 393 394 if (copy_from_user(&val, argp, sizeof(int))) 395 return -EFAULT; 396 397 if (copy_from_user(&speed, argp + 1, sizeof(int))) 398 return -EFAULT; 399 400 val = i8k_set_fan(val, speed); 401 break; 402 403 default: 404 return -EINVAL; 405 } 406 407 if (val < 0) 408 return val; 409 410 switch (cmd) { 411 case I8K_BIOS_VERSION: 412 if (copy_to_user(argp, &val, 4)) 413 return -EFAULT; 414 415 break; 416 case I8K_MACHINE_ID: 417 if (copy_to_user(argp, buff, 16)) 418 return -EFAULT; 419 420 break; 421 default: 422 if (copy_to_user(argp, &val, sizeof(int))) 423 return -EFAULT; 424 425 break; 426 } 427 428 return 0; 429} 430 431static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) 432{ 433 long ret; 434 435 mutex_lock(&i8k_mutex); 436 ret = i8k_ioctl_unlocked(fp, cmd, arg); 437 mutex_unlock(&i8k_mutex); 438 439 return ret; 440} 441 442/* 443 * Print the information for /proc/i8k. 444 */ 445static int i8k_proc_show(struct seq_file *seq, void *offset) 446{ 447 int fn_key, cpu_temp, ac_power; 448 int left_fan, right_fan, left_speed, right_speed; 449 450 cpu_temp = i8k_get_temp(0); /* 11100 µs */ 451 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */ 452 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */ 453 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */ 454 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */ 455 fn_key = i8k_get_fn_status(); /* 750 µs */ 456 if (power_status) 457 ac_power = i8k_get_power_status(); /* 14700 µs */ 458 else 459 ac_power = -1; 460 461 /* 462 * Info: 463 * 464 * 1) Format version (this will change if format changes) 465 * 2) BIOS version 466 * 3) BIOS machine ID 467 * 4) Cpu temperature 468 * 5) Left fan status 469 * 6) Right fan status 470 * 7) Left fan speed 471 * 8) Right fan speed 472 * 9) AC power 473 * 10) Fn Key status 474 */ 475 return seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n", 476 I8K_PROC_FMT, 477 bios_version, 478 i8k_get_dmi_data(DMI_PRODUCT_SERIAL), 479 cpu_temp, 480 left_fan, right_fan, left_speed, right_speed, 481 ac_power, fn_key); 482} 483 484static int i8k_open_fs(struct inode *inode, struct file *file) 485{ 486 return single_open(file, i8k_proc_show, NULL); 487} 488 489 490/* 491 * Hwmon interface 492 */ 493 494static ssize_t i8k_hwmon_show_temp(struct device *dev, 495 struct device_attribute *devattr, 496 char *buf) 497{ 498 int index = to_sensor_dev_attr(devattr)->index; 499 int temp; 500 501 temp = i8k_get_temp(index); 502 if (temp < 0) 503 return temp; 504 return sprintf(buf, "%d\n", temp * 1000); 505} 506 507static ssize_t i8k_hwmon_show_fan(struct device *dev, 508 struct device_attribute *devattr, 509 char *buf) 510{ 511 int index = to_sensor_dev_attr(devattr)->index; 512 int fan_speed; 513 514 fan_speed = i8k_get_fan_speed(index); 515 if (fan_speed < 0) 516 return fan_speed; 517 return sprintf(buf, "%d\n", fan_speed); 518} 519 520static ssize_t i8k_hwmon_show_pwm(struct device *dev, 521 struct device_attribute *devattr, 522 char *buf) 523{ 524 int index = to_sensor_dev_attr(devattr)->index; 525 int status; 526 527 status = i8k_get_fan_status(index); 528 if (status < 0) 529 return -EIO; 530 return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255)); 531} 532 533static ssize_t i8k_hwmon_set_pwm(struct device *dev, 534 struct device_attribute *attr, 535 const char *buf, size_t count) 536{ 537 int index = to_sensor_dev_attr(attr)->index; 538 unsigned long val; 539 int err; 540 541 err = kstrtoul(buf, 10, &val); 542 if (err) 543 return err; 544 val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max); 545 546 mutex_lock(&i8k_mutex); 547 err = i8k_set_fan(index, val); 548 mutex_unlock(&i8k_mutex); 549 550 return err < 0 ? -EIO : count; 551} 552 553static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0); 554static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1); 555static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2); 556static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3); 557static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 558 I8K_FAN_LEFT); 559static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm, 560 i8k_hwmon_set_pwm, I8K_FAN_LEFT); 561static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 562 I8K_FAN_RIGHT); 563static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm, 564 i8k_hwmon_set_pwm, I8K_FAN_RIGHT); 565 566static struct attribute *i8k_attrs[] = { 567 &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */ 568 &sensor_dev_attr_temp2_input.dev_attr.attr, /* 1 */ 569 &sensor_dev_attr_temp3_input.dev_attr.attr, /* 2 */ 570 &sensor_dev_attr_temp4_input.dev_attr.attr, /* 3 */ 571 &sensor_dev_attr_fan1_input.dev_attr.attr, /* 4 */ 572 &sensor_dev_attr_pwm1.dev_attr.attr, /* 5 */ 573 &sensor_dev_attr_fan2_input.dev_attr.attr, /* 6 */ 574 &sensor_dev_attr_pwm2.dev_attr.attr, /* 7 */ 575 NULL 576}; 577 578static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr, 579 int index) 580{ 581 if (index == 0 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1)) 582 return 0; 583 if (index == 1 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2)) 584 return 0; 585 if (index == 2 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3)) 586 return 0; 587 if (index == 3 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4)) 588 return 0; 589 if (index >= 4 && index <= 5 && 590 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1)) 591 return 0; 592 if (index >= 6 && index <= 7 && 593 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2)) 594 return 0; 595 596 return attr->mode; 597} 598 599static const struct attribute_group i8k_group = { 600 .attrs = i8k_attrs, 601 .is_visible = i8k_is_visible, 602}; 603__ATTRIBUTE_GROUPS(i8k); 604 605static int __init i8k_init_hwmon(void) 606{ 607 int err; 608 609 i8k_hwmon_flags = 0; 610 611 /* CPU temperature attributes, if temperature reading is OK */ 612 err = i8k_get_temp(0); 613 if (err >= 0) 614 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1; 615 /* check for additional temperature sensors */ 616 err = i8k_get_temp(1); 617 if (err >= 0) 618 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2; 619 err = i8k_get_temp(2); 620 if (err >= 0) 621 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3; 622 err = i8k_get_temp(3); 623 if (err >= 0) 624 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4; 625 626 /* Left fan attributes, if left fan is present */ 627 err = i8k_get_fan_status(I8K_FAN_LEFT); 628 if (err >= 0) 629 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1; 630 631 /* Right fan attributes, if right fan is present */ 632 err = i8k_get_fan_status(I8K_FAN_RIGHT); 633 if (err >= 0) 634 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2; 635 636 i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "i8k", NULL, 637 i8k_groups); 638 if (IS_ERR(i8k_hwmon_dev)) { 639 err = PTR_ERR(i8k_hwmon_dev); 640 i8k_hwmon_dev = NULL; 641 pr_err("hwmon registration failed (%d)\n", err); 642 return err; 643 } 644 return 0; 645} 646 647struct i8k_config_data { 648 int fan_mult; 649 int fan_max; 650}; 651 652enum i8k_configs { 653 DELL_LATITUDE_D520, 654 DELL_LATITUDE_E6540, 655 DELL_PRECISION_490, 656 DELL_STUDIO, 657 DELL_XPS_M140, 658}; 659 660static const struct i8k_config_data i8k_config_data[] = { 661 [DELL_LATITUDE_D520] = { 662 .fan_mult = 1, 663 .fan_max = I8K_FAN_TURBO, 664 }, 665 [DELL_LATITUDE_E6540] = { 666 .fan_mult = 1, 667 .fan_max = I8K_FAN_HIGH, 668 }, 669 [DELL_PRECISION_490] = { 670 .fan_mult = 1, 671 .fan_max = I8K_FAN_TURBO, 672 }, 673 [DELL_STUDIO] = { 674 .fan_mult = 1, 675 .fan_max = I8K_FAN_HIGH, 676 }, 677 [DELL_XPS_M140] = { 678 .fan_mult = 1, 679 .fan_max = I8K_FAN_HIGH, 680 }, 681}; 682 683static struct dmi_system_id i8k_dmi_table[] __initdata = { 684 { 685 .ident = "Dell Inspiron", 686 .matches = { 687 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"), 688 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"), 689 }, 690 }, 691 { 692 .ident = "Dell Latitude", 693 .matches = { 694 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"), 695 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"), 696 }, 697 }, 698 { 699 .ident = "Dell Inspiron 2", 700 .matches = { 701 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 702 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"), 703 }, 704 }, 705 { 706 .ident = "Dell Latitude D520", 707 .matches = { 708 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 709 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"), 710 }, 711 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520], 712 }, 713 { 714 .ident = "Dell Latitude E6540", 715 .matches = { 716 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 717 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6540"), 718 }, 719 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_E6540], 720 }, 721 { 722 .ident = "Dell Latitude 2", 723 .matches = { 724 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 725 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"), 726 }, 727 }, 728 { /* UK Inspiron 6400 */ 729 .ident = "Dell Inspiron 3", 730 .matches = { 731 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 732 DMI_MATCH(DMI_PRODUCT_NAME, "MM061"), 733 }, 734 }, 735 { 736 .ident = "Dell Inspiron 3", 737 .matches = { 738 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 739 DMI_MATCH(DMI_PRODUCT_NAME, "MP061"), 740 }, 741 }, 742 { 743 .ident = "Dell Precision 490", 744 .matches = { 745 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 746 DMI_MATCH(DMI_PRODUCT_NAME, 747 "Precision WorkStation 490"), 748 }, 749 .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490], 750 }, 751 { 752 .ident = "Dell Precision", 753 .matches = { 754 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 755 DMI_MATCH(DMI_PRODUCT_NAME, "Precision"), 756 }, 757 }, 758 { 759 .ident = "Dell Vostro", 760 .matches = { 761 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 762 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"), 763 }, 764 }, 765 { 766 .ident = "Dell XPS421", 767 .matches = { 768 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 769 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"), 770 }, 771 }, 772 { 773 .ident = "Dell Studio", 774 .matches = { 775 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 776 DMI_MATCH(DMI_PRODUCT_NAME, "Studio"), 777 }, 778 .driver_data = (void *)&i8k_config_data[DELL_STUDIO], 779 }, 780 { 781 .ident = "Dell XPS M140", 782 .matches = { 783 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 784 DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"), 785 }, 786 .driver_data = (void *)&i8k_config_data[DELL_XPS_M140], 787 }, 788 { } 789}; 790 791/* 792 * Probe for the presence of a supported laptop. 793 */ 794static int __init i8k_probe(void) 795{ 796 const struct dmi_system_id *id; 797 798 /* 799 * Get DMI information 800 */ 801 if (!dmi_check_system(i8k_dmi_table)) { 802 if (!ignore_dmi && !force) 803 return -ENODEV; 804 805 pr_info("not running on a supported Dell system.\n"); 806 pr_info("vendor=%s, model=%s, version=%s\n", 807 i8k_get_dmi_data(DMI_SYS_VENDOR), 808 i8k_get_dmi_data(DMI_PRODUCT_NAME), 809 i8k_get_dmi_data(DMI_BIOS_VERSION)); 810 } 811 812 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), 813 sizeof(bios_version)); 814 815 /* 816 * Get SMM Dell signature 817 */ 818 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) && 819 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) { 820 pr_err("unable to get SMM Dell signature\n"); 821 if (!force) 822 return -ENODEV; 823 } 824 825 i8k_fan_mult = fan_mult; 826 i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */ 827 id = dmi_first_match(i8k_dmi_table); 828 if (id && id->driver_data) { 829 const struct i8k_config_data *conf = id->driver_data; 830 831 if (fan_mult == I8K_FAN_MULT && conf->fan_mult) 832 i8k_fan_mult = conf->fan_mult; 833 if (fan_max == I8K_FAN_HIGH && conf->fan_max) 834 i8k_fan_max = conf->fan_max; 835 } 836 i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max); 837 838 return 0; 839} 840 841static int __init i8k_init(void) 842{ 843 struct proc_dir_entry *proc_i8k; 844 int err; 845 846 /* Are we running on an supported laptop? */ 847 if (i8k_probe()) 848 return -ENODEV; 849 850 /* Register the proc entry */ 851 proc_i8k = proc_create("i8k", 0, NULL, &i8k_fops); 852 if (!proc_i8k) 853 return -ENOENT; 854 855 err = i8k_init_hwmon(); 856 if (err) 857 goto exit_remove_proc; 858 859 return 0; 860 861 exit_remove_proc: 862 remove_proc_entry("i8k", NULL); 863 return err; 864} 865 866static void __exit i8k_exit(void) 867{ 868 hwmon_device_unregister(i8k_hwmon_dev); 869 remove_proc_entry("i8k", NULL); 870} 871 872module_init(i8k_init); 873module_exit(i8k_exit); 874