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@kernel.org> 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 static unsigned int manual_fan; 72 static unsigned int auto_fan; 73 74 #define I8K_HWMON_HAVE_TEMP1 (1 << 0) 75 #define I8K_HWMON_HAVE_TEMP2 (1 << 1) 76 #define I8K_HWMON_HAVE_TEMP3 (1 << 2) 77 #define I8K_HWMON_HAVE_TEMP4 (1 << 3) 78 #define I8K_HWMON_HAVE_TEMP5 (1 << 4) 79 #define I8K_HWMON_HAVE_TEMP6 (1 << 5) 80 #define I8K_HWMON_HAVE_TEMP7 (1 << 6) 81 #define I8K_HWMON_HAVE_TEMP8 (1 << 7) 82 #define I8K_HWMON_HAVE_TEMP9 (1 << 8) 83 #define I8K_HWMON_HAVE_TEMP10 (1 << 9) 84 #define I8K_HWMON_HAVE_FAN1 (1 << 10) 85 #define I8K_HWMON_HAVE_FAN2 (1 << 11) 86 #define I8K_HWMON_HAVE_FAN3 (1 << 12) 87 88 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)"); 89 MODULE_AUTHOR("Pali Rohár <pali@kernel.org>"); 90 MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver"); 91 MODULE_LICENSE("GPL"); 92 MODULE_ALIAS("i8k"); 93 94 static bool force; 95 module_param(force, bool, 0); 96 MODULE_PARM_DESC(force, "Force loading without checking for supported models"); 97 98 static bool ignore_dmi; 99 module_param(ignore_dmi, bool, 0); 100 MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match"); 101 102 #if IS_ENABLED(CONFIG_I8K) 103 static bool restricted = true; 104 module_param(restricted, bool, 0); 105 MODULE_PARM_DESC(restricted, "Restrict fan control and serial number to CAP_SYS_ADMIN (default: 1)"); 106 107 static bool power_status; 108 module_param(power_status, bool, 0600); 109 MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k (default: 0)"); 110 #endif 111 112 static uint fan_mult; 113 module_param(fan_mult, uint, 0); 114 MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)"); 115 116 static uint fan_max; 117 module_param(fan_max, uint, 0); 118 MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)"); 119 120 struct smm_regs { 121 unsigned int eax; 122 unsigned int ebx __packed; 123 unsigned int ecx __packed; 124 unsigned int edx __packed; 125 unsigned int esi __packed; 126 unsigned int edi __packed; 127 }; 128 129 static inline const char *i8k_get_dmi_data(int field) 130 { 131 const char *dmi_data = dmi_get_system_info(field); 132 133 return dmi_data && *dmi_data ? dmi_data : "?"; 134 } 135 136 /* 137 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard. 138 */ 139 static int i8k_smm_func(void *par) 140 { 141 int rc; 142 struct smm_regs *regs = par; 143 int eax = regs->eax; 144 145 #ifdef DEBUG 146 int ebx = regs->ebx; 147 unsigned long duration; 148 ktime_t calltime, delta, rettime; 149 150 calltime = ktime_get(); 151 #endif 152 153 /* SMM requires CPU 0 */ 154 if (smp_processor_id() != 0) 155 return -EBUSY; 156 157 #if defined(CONFIG_X86_64) 158 asm volatile("pushq %%rax\n\t" 159 "movl 0(%%rax),%%edx\n\t" 160 "pushq %%rdx\n\t" 161 "movl 4(%%rax),%%ebx\n\t" 162 "movl 8(%%rax),%%ecx\n\t" 163 "movl 12(%%rax),%%edx\n\t" 164 "movl 16(%%rax),%%esi\n\t" 165 "movl 20(%%rax),%%edi\n\t" 166 "popq %%rax\n\t" 167 "out %%al,$0xb2\n\t" 168 "out %%al,$0x84\n\t" 169 "xchgq %%rax,(%%rsp)\n\t" 170 "movl %%ebx,4(%%rax)\n\t" 171 "movl %%ecx,8(%%rax)\n\t" 172 "movl %%edx,12(%%rax)\n\t" 173 "movl %%esi,16(%%rax)\n\t" 174 "movl %%edi,20(%%rax)\n\t" 175 "popq %%rdx\n\t" 176 "movl %%edx,0(%%rax)\n\t" 177 "pushfq\n\t" 178 "popq %%rax\n\t" 179 "andl $1,%%eax\n" 180 : "=a"(rc) 181 : "a"(regs) 182 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); 183 #else 184 asm volatile("pushl %%eax\n\t" 185 "movl 0(%%eax),%%edx\n\t" 186 "push %%edx\n\t" 187 "movl 4(%%eax),%%ebx\n\t" 188 "movl 8(%%eax),%%ecx\n\t" 189 "movl 12(%%eax),%%edx\n\t" 190 "movl 16(%%eax),%%esi\n\t" 191 "movl 20(%%eax),%%edi\n\t" 192 "popl %%eax\n\t" 193 "out %%al,$0xb2\n\t" 194 "out %%al,$0x84\n\t" 195 "xchgl %%eax,(%%esp)\n\t" 196 "movl %%ebx,4(%%eax)\n\t" 197 "movl %%ecx,8(%%eax)\n\t" 198 "movl %%edx,12(%%eax)\n\t" 199 "movl %%esi,16(%%eax)\n\t" 200 "movl %%edi,20(%%eax)\n\t" 201 "popl %%edx\n\t" 202 "movl %%edx,0(%%eax)\n\t" 203 "lahf\n\t" 204 "shrl $8,%%eax\n\t" 205 "andl $1,%%eax\n" 206 : "=a"(rc) 207 : "a"(regs) 208 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); 209 #endif 210 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax) 211 rc = -EINVAL; 212 213 #ifdef DEBUG 214 rettime = ktime_get(); 215 delta = ktime_sub(rettime, calltime); 216 duration = ktime_to_ns(delta) >> 10; 217 pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lu usecs)\n", eax, ebx, 218 (rc ? 0xffff : regs->eax & 0xffff), duration); 219 #endif 220 221 return rc; 222 } 223 224 /* 225 * Call the System Management Mode BIOS. 226 */ 227 static int i8k_smm(struct smm_regs *regs) 228 { 229 int ret; 230 231 get_online_cpus(); 232 ret = smp_call_on_cpu(0, i8k_smm_func, regs, true); 233 put_online_cpus(); 234 235 return ret; 236 } 237 238 /* 239 * Read the fan status. 240 */ 241 static int i8k_get_fan_status(int fan) 242 { 243 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, }; 244 245 if (disallow_fan_support) 246 return -EINVAL; 247 248 regs.ebx = fan & 0xff; 249 return i8k_smm(®s) ? : regs.eax & 0xff; 250 } 251 252 /* 253 * Read the fan speed in RPM. 254 */ 255 static int i8k_get_fan_speed(int fan) 256 { 257 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, }; 258 259 if (disallow_fan_support) 260 return -EINVAL; 261 262 regs.ebx = fan & 0xff; 263 return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult; 264 } 265 266 /* 267 * Read the fan type. 268 */ 269 static int _i8k_get_fan_type(int fan) 270 { 271 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, }; 272 273 if (disallow_fan_support || disallow_fan_type_call) 274 return -EINVAL; 275 276 regs.ebx = fan & 0xff; 277 return i8k_smm(®s) ? : regs.eax & 0xff; 278 } 279 280 static int i8k_get_fan_type(int fan) 281 { 282 /* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */ 283 static int types[3] = { INT_MIN, INT_MIN, INT_MIN }; 284 285 if (types[fan] == INT_MIN) 286 types[fan] = _i8k_get_fan_type(fan); 287 288 return types[fan]; 289 } 290 291 /* 292 * Read the fan nominal rpm for specific fan speed. 293 */ 294 static int i8k_get_fan_nominal_speed(int fan, int speed) 295 { 296 struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, }; 297 298 if (disallow_fan_support) 299 return -EINVAL; 300 301 regs.ebx = (fan & 0xff) | (speed << 8); 302 return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult; 303 } 304 305 /* 306 * Enable or disable automatic BIOS fan control support 307 */ 308 static int i8k_enable_fan_auto_mode(bool enable) 309 { 310 struct smm_regs regs = { }; 311 312 if (disallow_fan_support) 313 return -EINVAL; 314 315 regs.eax = enable ? auto_fan : manual_fan; 316 return i8k_smm(®s); 317 } 318 319 /* 320 * Set the fan speed (off, low, high). Returns the new fan status. 321 */ 322 static int i8k_set_fan(int fan, int speed) 323 { 324 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, }; 325 326 if (disallow_fan_support) 327 return -EINVAL; 328 329 speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed); 330 regs.ebx = (fan & 0xff) | (speed << 8); 331 332 return i8k_smm(®s) ? : i8k_get_fan_status(fan); 333 } 334 335 static int i8k_get_temp_type(int sensor) 336 { 337 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, }; 338 339 regs.ebx = sensor & 0xff; 340 return i8k_smm(®s) ? : regs.eax & 0xff; 341 } 342 343 /* 344 * Read the cpu temperature. 345 */ 346 static int _i8k_get_temp(int sensor) 347 { 348 struct smm_regs regs = { 349 .eax = I8K_SMM_GET_TEMP, 350 .ebx = sensor & 0xff, 351 }; 352 353 return i8k_smm(®s) ? : regs.eax & 0xff; 354 } 355 356 static int i8k_get_temp(int sensor) 357 { 358 int temp = _i8k_get_temp(sensor); 359 360 /* 361 * Sometimes the temperature sensor returns 0x99, which is out of range. 362 * In this case we retry (once) before returning an error. 363 # 1003655137 00000058 00005a4b 364 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees 365 # 1003655139 00000054 00005c52 366 */ 367 if (temp == 0x99) { 368 msleep(100); 369 temp = _i8k_get_temp(sensor); 370 } 371 /* 372 * Return -ENODATA for all invalid temperatures. 373 * 374 * Known instances are the 0x99 value as seen above as well as 375 * 0xc1 (193), which may be returned when trying to read the GPU 376 * temperature if the system supports a GPU and it is currently 377 * turned off. 378 */ 379 if (temp > I8K_MAX_TEMP) 380 return -ENODATA; 381 382 return temp; 383 } 384 385 static int i8k_get_dell_signature(int req_fn) 386 { 387 struct smm_regs regs = { .eax = req_fn, }; 388 int rc; 389 390 rc = i8k_smm(®s); 391 if (rc < 0) 392 return rc; 393 394 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1; 395 } 396 397 #if IS_ENABLED(CONFIG_I8K) 398 399 /* 400 * Read the Fn key status. 401 */ 402 static int i8k_get_fn_status(void) 403 { 404 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, }; 405 int rc; 406 407 rc = i8k_smm(®s); 408 if (rc < 0) 409 return rc; 410 411 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) { 412 case I8K_FN_UP: 413 return I8K_VOL_UP; 414 case I8K_FN_DOWN: 415 return I8K_VOL_DOWN; 416 case I8K_FN_MUTE: 417 return I8K_VOL_MUTE; 418 default: 419 return 0; 420 } 421 } 422 423 /* 424 * Read the power status. 425 */ 426 static int i8k_get_power_status(void) 427 { 428 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, }; 429 int rc; 430 431 rc = i8k_smm(®s); 432 if (rc < 0) 433 return rc; 434 435 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY; 436 } 437 438 /* 439 * Procfs interface 440 */ 441 442 static int 443 i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg) 444 { 445 int val = 0; 446 int speed; 447 unsigned char buff[16]; 448 int __user *argp = (int __user *)arg; 449 450 if (!argp) 451 return -EINVAL; 452 453 switch (cmd) { 454 case I8K_BIOS_VERSION: 455 if (!isdigit(bios_version[0]) || !isdigit(bios_version[1]) || 456 !isdigit(bios_version[2])) 457 return -EINVAL; 458 459 val = (bios_version[0] << 16) | 460 (bios_version[1] << 8) | bios_version[2]; 461 break; 462 463 case I8K_MACHINE_ID: 464 if (restricted && !capable(CAP_SYS_ADMIN)) 465 return -EPERM; 466 467 memset(buff, 0, sizeof(buff)); 468 strlcpy(buff, bios_machineid, sizeof(buff)); 469 break; 470 471 case I8K_FN_STATUS: 472 val = i8k_get_fn_status(); 473 break; 474 475 case I8K_POWER_STATUS: 476 val = i8k_get_power_status(); 477 break; 478 479 case I8K_GET_TEMP: 480 val = i8k_get_temp(0); 481 break; 482 483 case I8K_GET_SPEED: 484 if (copy_from_user(&val, argp, sizeof(int))) 485 return -EFAULT; 486 487 val = i8k_get_fan_speed(val); 488 break; 489 490 case I8K_GET_FAN: 491 if (copy_from_user(&val, argp, sizeof(int))) 492 return -EFAULT; 493 494 val = i8k_get_fan_status(val); 495 break; 496 497 case I8K_SET_FAN: 498 if (restricted && !capable(CAP_SYS_ADMIN)) 499 return -EPERM; 500 501 if (copy_from_user(&val, argp, sizeof(int))) 502 return -EFAULT; 503 504 if (copy_from_user(&speed, argp + 1, sizeof(int))) 505 return -EFAULT; 506 507 val = i8k_set_fan(val, speed); 508 break; 509 510 default: 511 return -EINVAL; 512 } 513 514 if (val < 0) 515 return val; 516 517 switch (cmd) { 518 case I8K_BIOS_VERSION: 519 if (copy_to_user(argp, &val, 4)) 520 return -EFAULT; 521 522 break; 523 case I8K_MACHINE_ID: 524 if (copy_to_user(argp, buff, 16)) 525 return -EFAULT; 526 527 break; 528 default: 529 if (copy_to_user(argp, &val, sizeof(int))) 530 return -EFAULT; 531 532 break; 533 } 534 535 return 0; 536 } 537 538 static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) 539 { 540 long ret; 541 542 mutex_lock(&i8k_mutex); 543 ret = i8k_ioctl_unlocked(fp, cmd, arg); 544 mutex_unlock(&i8k_mutex); 545 546 return ret; 547 } 548 549 /* 550 * Print the information for /proc/i8k. 551 */ 552 static int i8k_proc_show(struct seq_file *seq, void *offset) 553 { 554 int fn_key, cpu_temp, ac_power; 555 int left_fan, right_fan, left_speed, right_speed; 556 557 cpu_temp = i8k_get_temp(0); /* 11100 µs */ 558 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */ 559 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */ 560 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */ 561 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */ 562 fn_key = i8k_get_fn_status(); /* 750 µs */ 563 if (power_status) 564 ac_power = i8k_get_power_status(); /* 14700 µs */ 565 else 566 ac_power = -1; 567 568 /* 569 * Info: 570 * 571 * 1) Format version (this will change if format changes) 572 * 2) BIOS version 573 * 3) BIOS machine ID 574 * 4) Cpu temperature 575 * 5) Left fan status 576 * 6) Right fan status 577 * 7) Left fan speed 578 * 8) Right fan speed 579 * 9) AC power 580 * 10) Fn Key status 581 */ 582 seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n", 583 I8K_PROC_FMT, 584 bios_version, 585 (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : bios_machineid, 586 cpu_temp, 587 left_fan, right_fan, left_speed, right_speed, 588 ac_power, fn_key); 589 590 return 0; 591 } 592 593 static int i8k_open_fs(struct inode *inode, struct file *file) 594 { 595 return single_open(file, i8k_proc_show, NULL); 596 } 597 598 static const struct proc_ops i8k_proc_ops = { 599 .proc_open = i8k_open_fs, 600 .proc_read = seq_read, 601 .proc_lseek = seq_lseek, 602 .proc_release = single_release, 603 .proc_ioctl = i8k_ioctl, 604 }; 605 606 static void __init i8k_init_procfs(void) 607 { 608 /* Register the proc entry */ 609 proc_create("i8k", 0, NULL, &i8k_proc_ops); 610 } 611 612 static void __exit i8k_exit_procfs(void) 613 { 614 remove_proc_entry("i8k", NULL); 615 } 616 617 #else 618 619 static inline void __init i8k_init_procfs(void) 620 { 621 } 622 623 static inline void __exit i8k_exit_procfs(void) 624 { 625 } 626 627 #endif 628 629 /* 630 * Hwmon interface 631 */ 632 633 static ssize_t i8k_hwmon_temp_label_show(struct device *dev, 634 struct device_attribute *devattr, 635 char *buf) 636 { 637 static const char * const labels[] = { 638 "CPU", 639 "GPU", 640 "SODIMM", 641 "Other", 642 "Ambient", 643 "Other", 644 }; 645 int index = to_sensor_dev_attr(devattr)->index; 646 int type; 647 648 type = i8k_get_temp_type(index); 649 if (type < 0) 650 return type; 651 if (type >= ARRAY_SIZE(labels)) 652 type = ARRAY_SIZE(labels) - 1; 653 return sprintf(buf, "%s\n", labels[type]); 654 } 655 656 static ssize_t i8k_hwmon_temp_show(struct device *dev, 657 struct device_attribute *devattr, 658 char *buf) 659 { 660 int index = to_sensor_dev_attr(devattr)->index; 661 int temp; 662 663 temp = i8k_get_temp(index); 664 if (temp < 0) 665 return temp; 666 return sprintf(buf, "%d\n", temp * 1000); 667 } 668 669 static ssize_t i8k_hwmon_fan_label_show(struct device *dev, 670 struct device_attribute *devattr, 671 char *buf) 672 { 673 static const char * const labels[] = { 674 "Processor Fan", 675 "Motherboard Fan", 676 "Video Fan", 677 "Power Supply Fan", 678 "Chipset Fan", 679 "Other Fan", 680 }; 681 int index = to_sensor_dev_attr(devattr)->index; 682 bool dock = false; 683 int type; 684 685 type = i8k_get_fan_type(index); 686 if (type < 0) 687 return type; 688 689 if (type & 0x10) { 690 dock = true; 691 type &= 0x0F; 692 } 693 694 if (type >= ARRAY_SIZE(labels)) 695 type = (ARRAY_SIZE(labels) - 1); 696 697 return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]); 698 } 699 700 static ssize_t i8k_hwmon_fan_show(struct device *dev, 701 struct device_attribute *devattr, char *buf) 702 { 703 int index = to_sensor_dev_attr(devattr)->index; 704 int fan_speed; 705 706 fan_speed = i8k_get_fan_speed(index); 707 if (fan_speed < 0) 708 return fan_speed; 709 return sprintf(buf, "%d\n", fan_speed); 710 } 711 712 static ssize_t i8k_hwmon_pwm_show(struct device *dev, 713 struct device_attribute *devattr, char *buf) 714 { 715 int index = to_sensor_dev_attr(devattr)->index; 716 int status; 717 718 status = i8k_get_fan_status(index); 719 if (status < 0) 720 return -EIO; 721 return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255)); 722 } 723 724 static ssize_t i8k_hwmon_pwm_store(struct device *dev, 725 struct device_attribute *attr, 726 const char *buf, size_t count) 727 { 728 int index = to_sensor_dev_attr(attr)->index; 729 unsigned long val; 730 int err; 731 732 err = kstrtoul(buf, 10, &val); 733 if (err) 734 return err; 735 val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max); 736 737 mutex_lock(&i8k_mutex); 738 err = i8k_set_fan(index, val); 739 mutex_unlock(&i8k_mutex); 740 741 return err < 0 ? -EIO : count; 742 } 743 744 static ssize_t i8k_hwmon_pwm_enable_store(struct device *dev, 745 struct device_attribute *attr, 746 const char *buf, size_t count) 747 { 748 int err; 749 bool enable; 750 unsigned long val; 751 752 if (!auto_fan) 753 return -ENODEV; 754 755 err = kstrtoul(buf, 10, &val); 756 if (err) 757 return err; 758 759 if (val == 1) 760 enable = false; 761 else if (val == 2) 762 enable = true; 763 else 764 return -EINVAL; 765 766 mutex_lock(&i8k_mutex); 767 err = i8k_enable_fan_auto_mode(enable); 768 mutex_unlock(&i8k_mutex); 769 770 return err ? err : count; 771 } 772 773 static SENSOR_DEVICE_ATTR_RO(temp1_input, i8k_hwmon_temp, 0); 774 static SENSOR_DEVICE_ATTR_RO(temp1_label, i8k_hwmon_temp_label, 0); 775 static SENSOR_DEVICE_ATTR_RO(temp2_input, i8k_hwmon_temp, 1); 776 static SENSOR_DEVICE_ATTR_RO(temp2_label, i8k_hwmon_temp_label, 1); 777 static SENSOR_DEVICE_ATTR_RO(temp3_input, i8k_hwmon_temp, 2); 778 static SENSOR_DEVICE_ATTR_RO(temp3_label, i8k_hwmon_temp_label, 2); 779 static SENSOR_DEVICE_ATTR_RO(temp4_input, i8k_hwmon_temp, 3); 780 static SENSOR_DEVICE_ATTR_RO(temp4_label, i8k_hwmon_temp_label, 3); 781 static SENSOR_DEVICE_ATTR_RO(temp5_input, i8k_hwmon_temp, 4); 782 static SENSOR_DEVICE_ATTR_RO(temp5_label, i8k_hwmon_temp_label, 4); 783 static SENSOR_DEVICE_ATTR_RO(temp6_input, i8k_hwmon_temp, 5); 784 static SENSOR_DEVICE_ATTR_RO(temp6_label, i8k_hwmon_temp_label, 5); 785 static SENSOR_DEVICE_ATTR_RO(temp7_input, i8k_hwmon_temp, 6); 786 static SENSOR_DEVICE_ATTR_RO(temp7_label, i8k_hwmon_temp_label, 6); 787 static SENSOR_DEVICE_ATTR_RO(temp8_input, i8k_hwmon_temp, 7); 788 static SENSOR_DEVICE_ATTR_RO(temp8_label, i8k_hwmon_temp_label, 7); 789 static SENSOR_DEVICE_ATTR_RO(temp9_input, i8k_hwmon_temp, 8); 790 static SENSOR_DEVICE_ATTR_RO(temp9_label, i8k_hwmon_temp_label, 8); 791 static SENSOR_DEVICE_ATTR_RO(temp10_input, i8k_hwmon_temp, 9); 792 static SENSOR_DEVICE_ATTR_RO(temp10_label, i8k_hwmon_temp_label, 9); 793 static SENSOR_DEVICE_ATTR_RO(fan1_input, i8k_hwmon_fan, 0); 794 static SENSOR_DEVICE_ATTR_RO(fan1_label, i8k_hwmon_fan_label, 0); 795 static SENSOR_DEVICE_ATTR_RW(pwm1, i8k_hwmon_pwm, 0); 796 static SENSOR_DEVICE_ATTR_WO(pwm1_enable, i8k_hwmon_pwm_enable, 0); 797 static SENSOR_DEVICE_ATTR_RO(fan2_input, i8k_hwmon_fan, 1); 798 static SENSOR_DEVICE_ATTR_RO(fan2_label, i8k_hwmon_fan_label, 1); 799 static SENSOR_DEVICE_ATTR_RW(pwm2, i8k_hwmon_pwm, 1); 800 static SENSOR_DEVICE_ATTR_RO(fan3_input, i8k_hwmon_fan, 2); 801 static SENSOR_DEVICE_ATTR_RO(fan3_label, i8k_hwmon_fan_label, 2); 802 static SENSOR_DEVICE_ATTR_RW(pwm3, i8k_hwmon_pwm, 2); 803 804 static struct attribute *i8k_attrs[] = { 805 &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */ 806 &sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */ 807 &sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */ 808 &sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */ 809 &sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */ 810 &sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */ 811 &sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */ 812 &sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */ 813 &sensor_dev_attr_temp5_input.dev_attr.attr, /* 8 */ 814 &sensor_dev_attr_temp5_label.dev_attr.attr, /* 9 */ 815 &sensor_dev_attr_temp6_input.dev_attr.attr, /* 10 */ 816 &sensor_dev_attr_temp6_label.dev_attr.attr, /* 11 */ 817 &sensor_dev_attr_temp7_input.dev_attr.attr, /* 12 */ 818 &sensor_dev_attr_temp7_label.dev_attr.attr, /* 13 */ 819 &sensor_dev_attr_temp8_input.dev_attr.attr, /* 14 */ 820 &sensor_dev_attr_temp8_label.dev_attr.attr, /* 15 */ 821 &sensor_dev_attr_temp9_input.dev_attr.attr, /* 16 */ 822 &sensor_dev_attr_temp9_label.dev_attr.attr, /* 17 */ 823 &sensor_dev_attr_temp10_input.dev_attr.attr, /* 18 */ 824 &sensor_dev_attr_temp10_label.dev_attr.attr, /* 19 */ 825 &sensor_dev_attr_fan1_input.dev_attr.attr, /* 20 */ 826 &sensor_dev_attr_fan1_label.dev_attr.attr, /* 21 */ 827 &sensor_dev_attr_pwm1.dev_attr.attr, /* 22 */ 828 &sensor_dev_attr_pwm1_enable.dev_attr.attr, /* 23 */ 829 &sensor_dev_attr_fan2_input.dev_attr.attr, /* 24 */ 830 &sensor_dev_attr_fan2_label.dev_attr.attr, /* 25 */ 831 &sensor_dev_attr_pwm2.dev_attr.attr, /* 26 */ 832 &sensor_dev_attr_fan3_input.dev_attr.attr, /* 27 */ 833 &sensor_dev_attr_fan3_label.dev_attr.attr, /* 28 */ 834 &sensor_dev_attr_pwm3.dev_attr.attr, /* 29 */ 835 NULL 836 }; 837 838 static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr, 839 int index) 840 { 841 if (disallow_fan_support && index >= 8) 842 return 0; 843 if (disallow_fan_type_call && 844 (index == 9 || index == 12 || index == 15)) 845 return 0; 846 if (index >= 0 && index <= 1 && 847 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1)) 848 return 0; 849 if (index >= 2 && index <= 3 && 850 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2)) 851 return 0; 852 if (index >= 4 && index <= 5 && 853 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3)) 854 return 0; 855 if (index >= 6 && index <= 7 && 856 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4)) 857 return 0; 858 if (index >= 8 && index <= 9 && 859 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP5)) 860 return 0; 861 if (index >= 10 && index <= 11 && 862 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP6)) 863 return 0; 864 if (index >= 12 && index <= 13 && 865 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP7)) 866 return 0; 867 if (index >= 14 && index <= 15 && 868 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP8)) 869 return 0; 870 if (index >= 16 && index <= 17 && 871 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP9)) 872 return 0; 873 if (index >= 18 && index <= 19 && 874 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP10)) 875 return 0; 876 877 if (index >= 20 && index <= 23 && 878 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1)) 879 return 0; 880 if (index >= 24 && index <= 26 && 881 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2)) 882 return 0; 883 if (index >= 27 && index <= 29 && 884 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN3)) 885 return 0; 886 887 if (index == 23 && !auto_fan) 888 return 0; 889 890 return attr->mode; 891 } 892 893 static const struct attribute_group i8k_group = { 894 .attrs = i8k_attrs, 895 .is_visible = i8k_is_visible, 896 }; 897 __ATTRIBUTE_GROUPS(i8k); 898 899 static int __init i8k_init_hwmon(void) 900 { 901 int err; 902 903 i8k_hwmon_flags = 0; 904 905 /* CPU temperature attributes, if temperature type is OK */ 906 err = i8k_get_temp_type(0); 907 if (err >= 0) 908 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1; 909 /* check for additional temperature sensors */ 910 err = i8k_get_temp_type(1); 911 if (err >= 0) 912 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2; 913 err = i8k_get_temp_type(2); 914 if (err >= 0) 915 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3; 916 err = i8k_get_temp_type(3); 917 if (err >= 0) 918 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4; 919 err = i8k_get_temp_type(4); 920 if (err >= 0) 921 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP5; 922 err = i8k_get_temp_type(5); 923 if (err >= 0) 924 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP6; 925 err = i8k_get_temp_type(6); 926 if (err >= 0) 927 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP7; 928 err = i8k_get_temp_type(7); 929 if (err >= 0) 930 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP8; 931 err = i8k_get_temp_type(8); 932 if (err >= 0) 933 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP9; 934 err = i8k_get_temp_type(9); 935 if (err >= 0) 936 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP10; 937 938 /* First fan attributes, if fan status or type is OK */ 939 err = i8k_get_fan_status(0); 940 if (err < 0) 941 err = i8k_get_fan_type(0); 942 if (err >= 0) 943 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1; 944 945 /* Second fan attributes, if fan status or type is OK */ 946 err = i8k_get_fan_status(1); 947 if (err < 0) 948 err = i8k_get_fan_type(1); 949 if (err >= 0) 950 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2; 951 952 /* Third fan attributes, if fan status or type is OK */ 953 err = i8k_get_fan_status(2); 954 if (err < 0) 955 err = i8k_get_fan_type(2); 956 if (err >= 0) 957 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN3; 958 959 i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm", 960 NULL, i8k_groups); 961 if (IS_ERR(i8k_hwmon_dev)) { 962 err = PTR_ERR(i8k_hwmon_dev); 963 i8k_hwmon_dev = NULL; 964 pr_err("hwmon registration failed (%d)\n", err); 965 return err; 966 } 967 return 0; 968 } 969 970 struct i8k_config_data { 971 uint fan_mult; 972 uint fan_max; 973 }; 974 975 enum i8k_configs { 976 DELL_LATITUDE_D520, 977 DELL_PRECISION_490, 978 DELL_STUDIO, 979 DELL_XPS, 980 }; 981 982 static const struct i8k_config_data i8k_config_data[] = { 983 [DELL_LATITUDE_D520] = { 984 .fan_mult = 1, 985 .fan_max = I8K_FAN_TURBO, 986 }, 987 [DELL_PRECISION_490] = { 988 .fan_mult = 1, 989 .fan_max = I8K_FAN_TURBO, 990 }, 991 [DELL_STUDIO] = { 992 .fan_mult = 1, 993 .fan_max = I8K_FAN_HIGH, 994 }, 995 [DELL_XPS] = { 996 .fan_mult = 1, 997 .fan_max = I8K_FAN_HIGH, 998 }, 999 }; 1000 1001 static const struct dmi_system_id i8k_dmi_table[] __initconst = { 1002 { 1003 .ident = "Dell Inspiron", 1004 .matches = { 1005 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"), 1006 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"), 1007 }, 1008 }, 1009 { 1010 .ident = "Dell Latitude", 1011 .matches = { 1012 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"), 1013 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"), 1014 }, 1015 }, 1016 { 1017 .ident = "Dell Inspiron 2", 1018 .matches = { 1019 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1020 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"), 1021 }, 1022 }, 1023 { 1024 .ident = "Dell Latitude D520", 1025 .matches = { 1026 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1027 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"), 1028 }, 1029 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520], 1030 }, 1031 { 1032 .ident = "Dell Latitude 2", 1033 .matches = { 1034 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1035 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"), 1036 }, 1037 }, 1038 { /* UK Inspiron 6400 */ 1039 .ident = "Dell Inspiron 3", 1040 .matches = { 1041 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1042 DMI_MATCH(DMI_PRODUCT_NAME, "MM061"), 1043 }, 1044 }, 1045 { 1046 .ident = "Dell Inspiron 3", 1047 .matches = { 1048 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1049 DMI_MATCH(DMI_PRODUCT_NAME, "MP061"), 1050 }, 1051 }, 1052 { 1053 .ident = "Dell Precision 490", 1054 .matches = { 1055 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1056 DMI_MATCH(DMI_PRODUCT_NAME, 1057 "Precision WorkStation 490"), 1058 }, 1059 .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490], 1060 }, 1061 { 1062 .ident = "Dell Precision", 1063 .matches = { 1064 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1065 DMI_MATCH(DMI_PRODUCT_NAME, "Precision"), 1066 }, 1067 }, 1068 { 1069 .ident = "Dell Vostro", 1070 .matches = { 1071 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1072 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"), 1073 }, 1074 }, 1075 { 1076 .ident = "Dell Studio", 1077 .matches = { 1078 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1079 DMI_MATCH(DMI_PRODUCT_NAME, "Studio"), 1080 }, 1081 .driver_data = (void *)&i8k_config_data[DELL_STUDIO], 1082 }, 1083 { 1084 .ident = "Dell XPS M140", 1085 .matches = { 1086 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1087 DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"), 1088 }, 1089 .driver_data = (void *)&i8k_config_data[DELL_XPS], 1090 }, 1091 { 1092 .ident = "Dell XPS", 1093 .matches = { 1094 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1095 DMI_MATCH(DMI_PRODUCT_NAME, "XPS"), 1096 }, 1097 }, 1098 { } 1099 }; 1100 1101 MODULE_DEVICE_TABLE(dmi, i8k_dmi_table); 1102 1103 /* 1104 * On some machines once I8K_SMM_GET_FAN_TYPE is issued then CPU fan speed 1105 * randomly going up and down due to bug in Dell SMM or BIOS. Here is blacklist 1106 * of affected Dell machines for which we disallow I8K_SMM_GET_FAN_TYPE call. 1107 * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121 1108 */ 1109 static const struct dmi_system_id i8k_blacklist_fan_type_dmi_table[] __initconst = { 1110 { 1111 .ident = "Dell Studio XPS 8000", 1112 .matches = { 1113 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1114 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000"), 1115 }, 1116 }, 1117 { 1118 .ident = "Dell Studio XPS 8100", 1119 .matches = { 1120 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1121 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"), 1122 }, 1123 }, 1124 { 1125 .ident = "Dell Inspiron 580", 1126 .matches = { 1127 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1128 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 580 "), 1129 }, 1130 }, 1131 { } 1132 }; 1133 1134 /* 1135 * On some machines all fan related SMM functions implemented by Dell BIOS 1136 * firmware freeze kernel for about 500ms. Until Dell fixes these problems fan 1137 * support for affected blacklisted Dell machines stay disabled. 1138 * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=195751 1139 */ 1140 static struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initdata = { 1141 { 1142 .ident = "Dell Inspiron 7720", 1143 .matches = { 1144 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1145 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"), 1146 }, 1147 }, 1148 { 1149 .ident = "Dell Vostro 3360", 1150 .matches = { 1151 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1152 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"), 1153 }, 1154 }, 1155 { 1156 .ident = "Dell XPS13 9333", 1157 .matches = { 1158 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1159 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"), 1160 }, 1161 }, 1162 { } 1163 }; 1164 1165 struct i8k_fan_control_data { 1166 unsigned int manual_fan; 1167 unsigned int auto_fan; 1168 }; 1169 1170 enum i8k_fan_controls { 1171 I8K_FAN_34A3_35A3, 1172 }; 1173 1174 static const struct i8k_fan_control_data i8k_fan_control_data[] = { 1175 [I8K_FAN_34A3_35A3] = { 1176 .manual_fan = 0x34a3, 1177 .auto_fan = 0x35a3, 1178 }, 1179 }; 1180 1181 static struct dmi_system_id i8k_whitelist_fan_control[] __initdata = { 1182 { 1183 .ident = "Dell Precision 5530", 1184 .matches = { 1185 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1186 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Precision 5530"), 1187 }, 1188 .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], 1189 }, 1190 { 1191 .ident = "Dell Latitude E6440", 1192 .matches = { 1193 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1194 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude E6440"), 1195 }, 1196 .driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3], 1197 }, 1198 { } 1199 }; 1200 1201 /* 1202 * Probe for the presence of a supported laptop. 1203 */ 1204 static int __init i8k_probe(void) 1205 { 1206 const struct dmi_system_id *id, *fan_control; 1207 int fan, ret; 1208 1209 /* 1210 * Get DMI information 1211 */ 1212 if (!dmi_check_system(i8k_dmi_table)) { 1213 if (!ignore_dmi && !force) 1214 return -ENODEV; 1215 1216 pr_info("not running on a supported Dell system.\n"); 1217 pr_info("vendor=%s, model=%s, version=%s\n", 1218 i8k_get_dmi_data(DMI_SYS_VENDOR), 1219 i8k_get_dmi_data(DMI_PRODUCT_NAME), 1220 i8k_get_dmi_data(DMI_BIOS_VERSION)); 1221 } 1222 1223 if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) { 1224 pr_warn("broken Dell BIOS detected, disallow fan support\n"); 1225 if (!force) 1226 disallow_fan_support = true; 1227 } 1228 1229 if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) { 1230 pr_warn("broken Dell BIOS detected, disallow fan type call\n"); 1231 if (!force) 1232 disallow_fan_type_call = true; 1233 } 1234 1235 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), 1236 sizeof(bios_version)); 1237 strlcpy(bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), 1238 sizeof(bios_machineid)); 1239 1240 /* 1241 * Get SMM Dell signature 1242 */ 1243 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) && 1244 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) { 1245 pr_err("unable to get SMM Dell signature\n"); 1246 if (!force) 1247 return -ENODEV; 1248 } 1249 1250 /* 1251 * Set fan multiplier and maximal fan speed from dmi config 1252 * Values specified in module parameters override values from dmi 1253 */ 1254 id = dmi_first_match(i8k_dmi_table); 1255 if (id && id->driver_data) { 1256 const struct i8k_config_data *conf = id->driver_data; 1257 if (!fan_mult && conf->fan_mult) 1258 fan_mult = conf->fan_mult; 1259 if (!fan_max && conf->fan_max) 1260 fan_max = conf->fan_max; 1261 } 1262 1263 i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */ 1264 i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max); 1265 1266 fan_control = dmi_first_match(i8k_whitelist_fan_control); 1267 if (fan_control && fan_control->driver_data) { 1268 const struct i8k_fan_control_data *data = fan_control->driver_data; 1269 1270 manual_fan = data->manual_fan; 1271 auto_fan = data->auto_fan; 1272 pr_info("enabling support for setting automatic/manual fan control\n"); 1273 } 1274 1275 if (!fan_mult) { 1276 /* 1277 * Autodetect fan multiplier based on nominal rpm 1278 * If fan reports rpm value too high then set multiplier to 1 1279 */ 1280 for (fan = 0; fan < 2; ++fan) { 1281 ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max); 1282 if (ret < 0) 1283 continue; 1284 if (ret > I8K_FAN_MAX_RPM) 1285 i8k_fan_mult = 1; 1286 break; 1287 } 1288 } else { 1289 /* Fan multiplier was specified in module param or in dmi */ 1290 i8k_fan_mult = fan_mult; 1291 } 1292 1293 return 0; 1294 } 1295 1296 static int __init i8k_init(void) 1297 { 1298 int err; 1299 1300 /* Are we running on an supported laptop? */ 1301 if (i8k_probe()) 1302 return -ENODEV; 1303 1304 err = i8k_init_hwmon(); 1305 if (err) 1306 return err; 1307 1308 i8k_init_procfs(); 1309 return 0; 1310 } 1311 1312 static void __exit i8k_exit(void) 1313 { 1314 hwmon_device_unregister(i8k_hwmon_dev); 1315 i8k_exit_procfs(); 1316 } 1317 1318 module_init(i8k_init); 1319 module_exit(i8k_exit); 1320