1 /* 2 * dell-smm-hwmon.c -- Linux driver for accessing the SMM BIOS on Dell laptops. 3 * 4 * Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org> 5 * 6 * Hwmon integration: 7 * Copyright (C) 2011 Jean Delvare <jdelvare@suse.de> 8 * Copyright (C) 2013, 2014 Guenter Roeck <linux@roeck-us.net> 9 * Copyright (C) 2014, 2015 Pali Rohár <pali.rohar@gmail.com> 10 * 11 * This program is free software; you can redistribute it and/or modify it 12 * under the terms of the GNU General Public License as published by the 13 * Free Software Foundation; either version 2, or (at your option) any 14 * later version. 15 * 16 * This program is distributed in the hope that it will be useful, but 17 * WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 19 * General Public License for more details. 20 */ 21 22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 23 24 #include <linux/cpu.h> 25 #include <linux/delay.h> 26 #include <linux/module.h> 27 #include <linux/types.h> 28 #include <linux/init.h> 29 #include <linux/proc_fs.h> 30 #include <linux/seq_file.h> 31 #include <linux/dmi.h> 32 #include <linux/capability.h> 33 #include <linux/mutex.h> 34 #include <linux/hwmon.h> 35 #include <linux/hwmon-sysfs.h> 36 #include <linux/uaccess.h> 37 #include <linux/io.h> 38 #include <linux/sched.h> 39 #include <linux/ctype.h> 40 #include <linux/smp.h> 41 42 #include <linux/i8k.h> 43 44 #define I8K_SMM_FN_STATUS 0x0025 45 #define I8K_SMM_POWER_STATUS 0x0069 46 #define I8K_SMM_SET_FAN 0x01a3 47 #define I8K_SMM_GET_FAN 0x00a3 48 #define I8K_SMM_GET_SPEED 0x02a3 49 #define I8K_SMM_GET_FAN_TYPE 0x03a3 50 #define I8K_SMM_GET_NOM_SPEED 0x04a3 51 #define I8K_SMM_GET_TEMP 0x10a3 52 #define I8K_SMM_GET_TEMP_TYPE 0x11a3 53 #define I8K_SMM_GET_DELL_SIG1 0xfea3 54 #define I8K_SMM_GET_DELL_SIG2 0xffa3 55 56 #define I8K_FAN_MULT 30 57 #define I8K_FAN_MAX_RPM 30000 58 #define I8K_MAX_TEMP 127 59 60 #define I8K_FN_NONE 0x00 61 #define I8K_FN_UP 0x01 62 #define I8K_FN_DOWN 0x02 63 #define I8K_FN_MUTE 0x04 64 #define I8K_FN_MASK 0x07 65 #define I8K_FN_SHIFT 8 66 67 #define I8K_POWER_AC 0x05 68 #define I8K_POWER_BATTERY 0x01 69 70 static DEFINE_MUTEX(i8k_mutex); 71 static char bios_version[4]; 72 static char bios_machineid[16]; 73 static struct device *i8k_hwmon_dev; 74 static u32 i8k_hwmon_flags; 75 static uint i8k_fan_mult = I8K_FAN_MULT; 76 static uint i8k_pwm_mult; 77 static uint i8k_fan_max = I8K_FAN_HIGH; 78 static bool disallow_fan_type_call; 79 static bool disallow_fan_support; 80 81 #define I8K_HWMON_HAVE_TEMP1 (1 << 0) 82 #define I8K_HWMON_HAVE_TEMP2 (1 << 1) 83 #define I8K_HWMON_HAVE_TEMP3 (1 << 2) 84 #define I8K_HWMON_HAVE_TEMP4 (1 << 3) 85 #define I8K_HWMON_HAVE_FAN1 (1 << 4) 86 #define I8K_HWMON_HAVE_FAN2 (1 << 5) 87 #define I8K_HWMON_HAVE_FAN3 (1 << 6) 88 89 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)"); 90 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>"); 91 MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver"); 92 MODULE_LICENSE("GPL"); 93 MODULE_ALIAS("i8k"); 94 95 static bool force; 96 module_param(force, bool, 0); 97 MODULE_PARM_DESC(force, "Force loading without checking for supported models"); 98 99 static bool ignore_dmi; 100 module_param(ignore_dmi, bool, 0); 101 MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match"); 102 103 #if IS_ENABLED(CONFIG_I8K) 104 static bool restricted = true; 105 module_param(restricted, bool, 0); 106 MODULE_PARM_DESC(restricted, "Restrict fan control and serial number to CAP_SYS_ADMIN (default: 1)"); 107 108 static bool power_status; 109 module_param(power_status, bool, 0600); 110 MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k (default: 0)"); 111 #endif 112 113 static uint fan_mult; 114 module_param(fan_mult, uint, 0); 115 MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)"); 116 117 static uint fan_max; 118 module_param(fan_max, uint, 0); 119 MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)"); 120 121 struct smm_regs { 122 unsigned int eax; 123 unsigned int ebx __packed; 124 unsigned int ecx __packed; 125 unsigned int edx __packed; 126 unsigned int esi __packed; 127 unsigned int edi __packed; 128 }; 129 130 static inline const char *i8k_get_dmi_data(int field) 131 { 132 const char *dmi_data = dmi_get_system_info(field); 133 134 return dmi_data && *dmi_data ? dmi_data : "?"; 135 } 136 137 /* 138 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard. 139 */ 140 static int i8k_smm_func(void *par) 141 { 142 int rc; 143 struct smm_regs *regs = par; 144 int eax = regs->eax; 145 146 #ifdef DEBUG 147 int ebx = regs->ebx; 148 unsigned long duration; 149 ktime_t calltime, delta, rettime; 150 151 calltime = ktime_get(); 152 #endif 153 154 /* SMM requires CPU 0 */ 155 if (smp_processor_id() != 0) 156 return -EBUSY; 157 158 #if defined(CONFIG_X86_64) 159 asm volatile("pushq %%rax\n\t" 160 "movl 0(%%rax),%%edx\n\t" 161 "pushq %%rdx\n\t" 162 "movl 4(%%rax),%%ebx\n\t" 163 "movl 8(%%rax),%%ecx\n\t" 164 "movl 12(%%rax),%%edx\n\t" 165 "movl 16(%%rax),%%esi\n\t" 166 "movl 20(%%rax),%%edi\n\t" 167 "popq %%rax\n\t" 168 "out %%al,$0xb2\n\t" 169 "out %%al,$0x84\n\t" 170 "xchgq %%rax,(%%rsp)\n\t" 171 "movl %%ebx,4(%%rax)\n\t" 172 "movl %%ecx,8(%%rax)\n\t" 173 "movl %%edx,12(%%rax)\n\t" 174 "movl %%esi,16(%%rax)\n\t" 175 "movl %%edi,20(%%rax)\n\t" 176 "popq %%rdx\n\t" 177 "movl %%edx,0(%%rax)\n\t" 178 "pushfq\n\t" 179 "popq %%rax\n\t" 180 "andl $1,%%eax\n" 181 : "=a"(rc) 182 : "a"(regs) 183 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); 184 #else 185 asm volatile("pushl %%eax\n\t" 186 "movl 0(%%eax),%%edx\n\t" 187 "push %%edx\n\t" 188 "movl 4(%%eax),%%ebx\n\t" 189 "movl 8(%%eax),%%ecx\n\t" 190 "movl 12(%%eax),%%edx\n\t" 191 "movl 16(%%eax),%%esi\n\t" 192 "movl 20(%%eax),%%edi\n\t" 193 "popl %%eax\n\t" 194 "out %%al,$0xb2\n\t" 195 "out %%al,$0x84\n\t" 196 "xchgl %%eax,(%%esp)\n\t" 197 "movl %%ebx,4(%%eax)\n\t" 198 "movl %%ecx,8(%%eax)\n\t" 199 "movl %%edx,12(%%eax)\n\t" 200 "movl %%esi,16(%%eax)\n\t" 201 "movl %%edi,20(%%eax)\n\t" 202 "popl %%edx\n\t" 203 "movl %%edx,0(%%eax)\n\t" 204 "lahf\n\t" 205 "shrl $8,%%eax\n\t" 206 "andl $1,%%eax\n" 207 : "=a"(rc) 208 : "a"(regs) 209 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); 210 #endif 211 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax) 212 rc = -EINVAL; 213 214 #ifdef DEBUG 215 rettime = ktime_get(); 216 delta = ktime_sub(rettime, calltime); 217 duration = ktime_to_ns(delta) >> 10; 218 pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lu usecs)\n", eax, ebx, 219 (rc ? 0xffff : regs->eax & 0xffff), duration); 220 #endif 221 222 return rc; 223 } 224 225 /* 226 * Call the System Management Mode BIOS. 227 */ 228 static int i8k_smm(struct smm_regs *regs) 229 { 230 int ret; 231 232 get_online_cpus(); 233 ret = smp_call_on_cpu(0, i8k_smm_func, regs, true); 234 put_online_cpus(); 235 236 return ret; 237 } 238 239 /* 240 * Read the fan status. 241 */ 242 static int i8k_get_fan_status(int fan) 243 { 244 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, }; 245 246 if (disallow_fan_support) 247 return -EINVAL; 248 249 regs.ebx = fan & 0xff; 250 return i8k_smm(®s) ? : regs.eax & 0xff; 251 } 252 253 /* 254 * Read the fan speed in RPM. 255 */ 256 static int i8k_get_fan_speed(int fan) 257 { 258 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, }; 259 260 if (disallow_fan_support) 261 return -EINVAL; 262 263 regs.ebx = fan & 0xff; 264 return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult; 265 } 266 267 /* 268 * Read the fan type. 269 */ 270 static int _i8k_get_fan_type(int fan) 271 { 272 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, }; 273 274 if (disallow_fan_support || disallow_fan_type_call) 275 return -EINVAL; 276 277 regs.ebx = fan & 0xff; 278 return i8k_smm(®s) ? : regs.eax & 0xff; 279 } 280 281 static int i8k_get_fan_type(int fan) 282 { 283 /* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */ 284 static int types[3] = { INT_MIN, INT_MIN, INT_MIN }; 285 286 if (types[fan] == INT_MIN) 287 types[fan] = _i8k_get_fan_type(fan); 288 289 return types[fan]; 290 } 291 292 /* 293 * Read the fan nominal rpm for specific fan speed. 294 */ 295 static int i8k_get_fan_nominal_speed(int fan, int speed) 296 { 297 struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, }; 298 299 if (disallow_fan_support) 300 return -EINVAL; 301 302 regs.ebx = (fan & 0xff) | (speed << 8); 303 return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult; 304 } 305 306 /* 307 * Set the fan speed (off, low, high). Returns the new fan status. 308 */ 309 static int i8k_set_fan(int fan, int speed) 310 { 311 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, }; 312 313 if (disallow_fan_support) 314 return -EINVAL; 315 316 speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed); 317 regs.ebx = (fan & 0xff) | (speed << 8); 318 319 return i8k_smm(®s) ? : i8k_get_fan_status(fan); 320 } 321 322 static int i8k_get_temp_type(int sensor) 323 { 324 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, }; 325 326 regs.ebx = sensor & 0xff; 327 return i8k_smm(®s) ? : regs.eax & 0xff; 328 } 329 330 /* 331 * Read the cpu temperature. 332 */ 333 static int _i8k_get_temp(int sensor) 334 { 335 struct smm_regs regs = { 336 .eax = I8K_SMM_GET_TEMP, 337 .ebx = sensor & 0xff, 338 }; 339 340 return i8k_smm(®s) ? : regs.eax & 0xff; 341 } 342 343 static int i8k_get_temp(int sensor) 344 { 345 int temp = _i8k_get_temp(sensor); 346 347 /* 348 * Sometimes the temperature sensor returns 0x99, which is out of range. 349 * In this case we retry (once) before returning an error. 350 # 1003655137 00000058 00005a4b 351 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees 352 # 1003655139 00000054 00005c52 353 */ 354 if (temp == 0x99) { 355 msleep(100); 356 temp = _i8k_get_temp(sensor); 357 } 358 /* 359 * Return -ENODATA for all invalid temperatures. 360 * 361 * Known instances are the 0x99 value as seen above as well as 362 * 0xc1 (193), which may be returned when trying to read the GPU 363 * temperature if the system supports a GPU and it is currently 364 * turned off. 365 */ 366 if (temp > I8K_MAX_TEMP) 367 return -ENODATA; 368 369 return temp; 370 } 371 372 static int i8k_get_dell_signature(int req_fn) 373 { 374 struct smm_regs regs = { .eax = req_fn, }; 375 int rc; 376 377 rc = i8k_smm(®s); 378 if (rc < 0) 379 return rc; 380 381 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1; 382 } 383 384 #if IS_ENABLED(CONFIG_I8K) 385 386 /* 387 * Read the Fn key status. 388 */ 389 static int i8k_get_fn_status(void) 390 { 391 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, }; 392 int rc; 393 394 rc = i8k_smm(®s); 395 if (rc < 0) 396 return rc; 397 398 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) { 399 case I8K_FN_UP: 400 return I8K_VOL_UP; 401 case I8K_FN_DOWN: 402 return I8K_VOL_DOWN; 403 case I8K_FN_MUTE: 404 return I8K_VOL_MUTE; 405 default: 406 return 0; 407 } 408 } 409 410 /* 411 * Read the power status. 412 */ 413 static int i8k_get_power_status(void) 414 { 415 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, }; 416 int rc; 417 418 rc = i8k_smm(®s); 419 if (rc < 0) 420 return rc; 421 422 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY; 423 } 424 425 /* 426 * Procfs interface 427 */ 428 429 static int 430 i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg) 431 { 432 int val = 0; 433 int speed; 434 unsigned char buff[16]; 435 int __user *argp = (int __user *)arg; 436 437 if (!argp) 438 return -EINVAL; 439 440 switch (cmd) { 441 case I8K_BIOS_VERSION: 442 if (!isdigit(bios_version[0]) || !isdigit(bios_version[1]) || 443 !isdigit(bios_version[2])) 444 return -EINVAL; 445 446 val = (bios_version[0] << 16) | 447 (bios_version[1] << 8) | bios_version[2]; 448 break; 449 450 case I8K_MACHINE_ID: 451 if (restricted && !capable(CAP_SYS_ADMIN)) 452 return -EPERM; 453 454 memset(buff, 0, sizeof(buff)); 455 strlcpy(buff, bios_machineid, sizeof(buff)); 456 break; 457 458 case I8K_FN_STATUS: 459 val = i8k_get_fn_status(); 460 break; 461 462 case I8K_POWER_STATUS: 463 val = i8k_get_power_status(); 464 break; 465 466 case I8K_GET_TEMP: 467 val = i8k_get_temp(0); 468 break; 469 470 case I8K_GET_SPEED: 471 if (copy_from_user(&val, argp, sizeof(int))) 472 return -EFAULT; 473 474 val = i8k_get_fan_speed(val); 475 break; 476 477 case I8K_GET_FAN: 478 if (copy_from_user(&val, argp, sizeof(int))) 479 return -EFAULT; 480 481 val = i8k_get_fan_status(val); 482 break; 483 484 case I8K_SET_FAN: 485 if (restricted && !capable(CAP_SYS_ADMIN)) 486 return -EPERM; 487 488 if (copy_from_user(&val, argp, sizeof(int))) 489 return -EFAULT; 490 491 if (copy_from_user(&speed, argp + 1, sizeof(int))) 492 return -EFAULT; 493 494 val = i8k_set_fan(val, speed); 495 break; 496 497 default: 498 return -EINVAL; 499 } 500 501 if (val < 0) 502 return val; 503 504 switch (cmd) { 505 case I8K_BIOS_VERSION: 506 if (copy_to_user(argp, &val, 4)) 507 return -EFAULT; 508 509 break; 510 case I8K_MACHINE_ID: 511 if (copy_to_user(argp, buff, 16)) 512 return -EFAULT; 513 514 break; 515 default: 516 if (copy_to_user(argp, &val, sizeof(int))) 517 return -EFAULT; 518 519 break; 520 } 521 522 return 0; 523 } 524 525 static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) 526 { 527 long ret; 528 529 mutex_lock(&i8k_mutex); 530 ret = i8k_ioctl_unlocked(fp, cmd, arg); 531 mutex_unlock(&i8k_mutex); 532 533 return ret; 534 } 535 536 /* 537 * Print the information for /proc/i8k. 538 */ 539 static int i8k_proc_show(struct seq_file *seq, void *offset) 540 { 541 int fn_key, cpu_temp, ac_power; 542 int left_fan, right_fan, left_speed, right_speed; 543 544 cpu_temp = i8k_get_temp(0); /* 11100 µs */ 545 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */ 546 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */ 547 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */ 548 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */ 549 fn_key = i8k_get_fn_status(); /* 750 µs */ 550 if (power_status) 551 ac_power = i8k_get_power_status(); /* 14700 µs */ 552 else 553 ac_power = -1; 554 555 /* 556 * Info: 557 * 558 * 1) Format version (this will change if format changes) 559 * 2) BIOS version 560 * 3) BIOS machine ID 561 * 4) Cpu temperature 562 * 5) Left fan status 563 * 6) Right fan status 564 * 7) Left fan speed 565 * 8) Right fan speed 566 * 9) AC power 567 * 10) Fn Key status 568 */ 569 seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n", 570 I8K_PROC_FMT, 571 bios_version, 572 (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : bios_machineid, 573 cpu_temp, 574 left_fan, right_fan, left_speed, right_speed, 575 ac_power, fn_key); 576 577 return 0; 578 } 579 580 static int i8k_open_fs(struct inode *inode, struct file *file) 581 { 582 return single_open(file, i8k_proc_show, NULL); 583 } 584 585 static const struct file_operations i8k_fops = { 586 .owner = THIS_MODULE, 587 .open = i8k_open_fs, 588 .read = seq_read, 589 .llseek = seq_lseek, 590 .release = single_release, 591 .unlocked_ioctl = i8k_ioctl, 592 }; 593 594 static void __init i8k_init_procfs(void) 595 { 596 /* Register the proc entry */ 597 proc_create("i8k", 0, NULL, &i8k_fops); 598 } 599 600 static void __exit i8k_exit_procfs(void) 601 { 602 remove_proc_entry("i8k", NULL); 603 } 604 605 #else 606 607 static inline void __init i8k_init_procfs(void) 608 { 609 } 610 611 static inline void __exit i8k_exit_procfs(void) 612 { 613 } 614 615 #endif 616 617 /* 618 * Hwmon interface 619 */ 620 621 static ssize_t i8k_hwmon_temp_label_show(struct device *dev, 622 struct device_attribute *devattr, 623 char *buf) 624 { 625 static const char * const labels[] = { 626 "CPU", 627 "GPU", 628 "SODIMM", 629 "Other", 630 "Ambient", 631 "Other", 632 }; 633 int index = to_sensor_dev_attr(devattr)->index; 634 int type; 635 636 type = i8k_get_temp_type(index); 637 if (type < 0) 638 return type; 639 if (type >= ARRAY_SIZE(labels)) 640 type = ARRAY_SIZE(labels) - 1; 641 return sprintf(buf, "%s\n", labels[type]); 642 } 643 644 static ssize_t i8k_hwmon_temp_show(struct device *dev, 645 struct device_attribute *devattr, 646 char *buf) 647 { 648 int index = to_sensor_dev_attr(devattr)->index; 649 int temp; 650 651 temp = i8k_get_temp(index); 652 if (temp < 0) 653 return temp; 654 return sprintf(buf, "%d\n", temp * 1000); 655 } 656 657 static ssize_t i8k_hwmon_fan_label_show(struct device *dev, 658 struct device_attribute *devattr, 659 char *buf) 660 { 661 static const char * const labels[] = { 662 "Processor Fan", 663 "Motherboard Fan", 664 "Video Fan", 665 "Power Supply Fan", 666 "Chipset Fan", 667 "Other Fan", 668 }; 669 int index = to_sensor_dev_attr(devattr)->index; 670 bool dock = false; 671 int type; 672 673 type = i8k_get_fan_type(index); 674 if (type < 0) 675 return type; 676 677 if (type & 0x10) { 678 dock = true; 679 type &= 0x0F; 680 } 681 682 if (type >= ARRAY_SIZE(labels)) 683 type = (ARRAY_SIZE(labels) - 1); 684 685 return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]); 686 } 687 688 static ssize_t i8k_hwmon_fan_show(struct device *dev, 689 struct device_attribute *devattr, char *buf) 690 { 691 int index = to_sensor_dev_attr(devattr)->index; 692 int fan_speed; 693 694 fan_speed = i8k_get_fan_speed(index); 695 if (fan_speed < 0) 696 return fan_speed; 697 return sprintf(buf, "%d\n", fan_speed); 698 } 699 700 static ssize_t i8k_hwmon_pwm_show(struct device *dev, 701 struct device_attribute *devattr, char *buf) 702 { 703 int index = to_sensor_dev_attr(devattr)->index; 704 int status; 705 706 status = i8k_get_fan_status(index); 707 if (status < 0) 708 return -EIO; 709 return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255)); 710 } 711 712 static ssize_t i8k_hwmon_pwm_store(struct device *dev, 713 struct device_attribute *attr, 714 const char *buf, size_t count) 715 { 716 int index = to_sensor_dev_attr(attr)->index; 717 unsigned long val; 718 int err; 719 720 err = kstrtoul(buf, 10, &val); 721 if (err) 722 return err; 723 val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max); 724 725 mutex_lock(&i8k_mutex); 726 err = i8k_set_fan(index, val); 727 mutex_unlock(&i8k_mutex); 728 729 return err < 0 ? -EIO : count; 730 } 731 732 static SENSOR_DEVICE_ATTR_RO(temp1_input, i8k_hwmon_temp, 0); 733 static SENSOR_DEVICE_ATTR_RO(temp1_label, i8k_hwmon_temp_label, 0); 734 static SENSOR_DEVICE_ATTR_RO(temp2_input, i8k_hwmon_temp, 1); 735 static SENSOR_DEVICE_ATTR_RO(temp2_label, i8k_hwmon_temp_label, 1); 736 static SENSOR_DEVICE_ATTR_RO(temp3_input, i8k_hwmon_temp, 2); 737 static SENSOR_DEVICE_ATTR_RO(temp3_label, i8k_hwmon_temp_label, 2); 738 static SENSOR_DEVICE_ATTR_RO(temp4_input, i8k_hwmon_temp, 3); 739 static SENSOR_DEVICE_ATTR_RO(temp4_label, i8k_hwmon_temp_label, 3); 740 static SENSOR_DEVICE_ATTR_RO(fan1_input, i8k_hwmon_fan, 0); 741 static SENSOR_DEVICE_ATTR_RO(fan1_label, i8k_hwmon_fan_label, 0); 742 static SENSOR_DEVICE_ATTR_RW(pwm1, i8k_hwmon_pwm, 0); 743 static SENSOR_DEVICE_ATTR_RO(fan2_input, i8k_hwmon_fan, 1); 744 static SENSOR_DEVICE_ATTR_RO(fan2_label, i8k_hwmon_fan_label, 1); 745 static SENSOR_DEVICE_ATTR_RW(pwm2, i8k_hwmon_pwm, 1); 746 static SENSOR_DEVICE_ATTR_RO(fan3_input, i8k_hwmon_fan, 2); 747 static SENSOR_DEVICE_ATTR_RO(fan3_label, i8k_hwmon_fan_label, 2); 748 static SENSOR_DEVICE_ATTR_RW(pwm3, i8k_hwmon_pwm, 2); 749 750 static struct attribute *i8k_attrs[] = { 751 &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */ 752 &sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */ 753 &sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */ 754 &sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */ 755 &sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */ 756 &sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */ 757 &sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */ 758 &sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */ 759 &sensor_dev_attr_fan1_input.dev_attr.attr, /* 8 */ 760 &sensor_dev_attr_fan1_label.dev_attr.attr, /* 9 */ 761 &sensor_dev_attr_pwm1.dev_attr.attr, /* 10 */ 762 &sensor_dev_attr_fan2_input.dev_attr.attr, /* 11 */ 763 &sensor_dev_attr_fan2_label.dev_attr.attr, /* 12 */ 764 &sensor_dev_attr_pwm2.dev_attr.attr, /* 13 */ 765 &sensor_dev_attr_fan3_input.dev_attr.attr, /* 14 */ 766 &sensor_dev_attr_fan3_label.dev_attr.attr, /* 15 */ 767 &sensor_dev_attr_pwm3.dev_attr.attr, /* 16 */ 768 NULL 769 }; 770 771 static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr, 772 int index) 773 { 774 if (disallow_fan_support && index >= 8) 775 return 0; 776 if (disallow_fan_type_call && 777 (index == 9 || index == 12 || index == 15)) 778 return 0; 779 if (index >= 0 && index <= 1 && 780 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1)) 781 return 0; 782 if (index >= 2 && index <= 3 && 783 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2)) 784 return 0; 785 if (index >= 4 && index <= 5 && 786 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3)) 787 return 0; 788 if (index >= 6 && index <= 7 && 789 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4)) 790 return 0; 791 if (index >= 8 && index <= 10 && 792 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1)) 793 return 0; 794 if (index >= 11 && index <= 13 && 795 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2)) 796 return 0; 797 if (index >= 14 && index <= 16 && 798 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN3)) 799 return 0; 800 801 return attr->mode; 802 } 803 804 static const struct attribute_group i8k_group = { 805 .attrs = i8k_attrs, 806 .is_visible = i8k_is_visible, 807 }; 808 __ATTRIBUTE_GROUPS(i8k); 809 810 static int __init i8k_init_hwmon(void) 811 { 812 int err; 813 814 i8k_hwmon_flags = 0; 815 816 /* CPU temperature attributes, if temperature type is OK */ 817 err = i8k_get_temp_type(0); 818 if (err >= 0) 819 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1; 820 /* check for additional temperature sensors */ 821 err = i8k_get_temp_type(1); 822 if (err >= 0) 823 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2; 824 err = i8k_get_temp_type(2); 825 if (err >= 0) 826 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3; 827 err = i8k_get_temp_type(3); 828 if (err >= 0) 829 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4; 830 831 /* First fan attributes, if fan status or type is OK */ 832 err = i8k_get_fan_status(0); 833 if (err < 0) 834 err = i8k_get_fan_type(0); 835 if (err >= 0) 836 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1; 837 838 /* Second fan attributes, if fan status or type is OK */ 839 err = i8k_get_fan_status(1); 840 if (err < 0) 841 err = i8k_get_fan_type(1); 842 if (err >= 0) 843 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2; 844 845 /* Third fan attributes, if fan status or type is OK */ 846 err = i8k_get_fan_status(2); 847 if (err < 0) 848 err = i8k_get_fan_type(2); 849 if (err >= 0) 850 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN3; 851 852 i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm", 853 NULL, i8k_groups); 854 if (IS_ERR(i8k_hwmon_dev)) { 855 err = PTR_ERR(i8k_hwmon_dev); 856 i8k_hwmon_dev = NULL; 857 pr_err("hwmon registration failed (%d)\n", err); 858 return err; 859 } 860 return 0; 861 } 862 863 struct i8k_config_data { 864 uint fan_mult; 865 uint fan_max; 866 }; 867 868 enum i8k_configs { 869 DELL_LATITUDE_D520, 870 DELL_PRECISION_490, 871 DELL_STUDIO, 872 DELL_XPS, 873 }; 874 875 static const struct i8k_config_data i8k_config_data[] = { 876 [DELL_LATITUDE_D520] = { 877 .fan_mult = 1, 878 .fan_max = I8K_FAN_TURBO, 879 }, 880 [DELL_PRECISION_490] = { 881 .fan_mult = 1, 882 .fan_max = I8K_FAN_TURBO, 883 }, 884 [DELL_STUDIO] = { 885 .fan_mult = 1, 886 .fan_max = I8K_FAN_HIGH, 887 }, 888 [DELL_XPS] = { 889 .fan_mult = 1, 890 .fan_max = I8K_FAN_HIGH, 891 }, 892 }; 893 894 static const struct dmi_system_id i8k_dmi_table[] __initconst = { 895 { 896 .ident = "Dell Inspiron", 897 .matches = { 898 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"), 899 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"), 900 }, 901 }, 902 { 903 .ident = "Dell Latitude", 904 .matches = { 905 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"), 906 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"), 907 }, 908 }, 909 { 910 .ident = "Dell Inspiron 2", 911 .matches = { 912 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 913 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"), 914 }, 915 }, 916 { 917 .ident = "Dell Latitude D520", 918 .matches = { 919 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 920 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"), 921 }, 922 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520], 923 }, 924 { 925 .ident = "Dell Latitude 2", 926 .matches = { 927 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 928 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"), 929 }, 930 }, 931 { /* UK Inspiron 6400 */ 932 .ident = "Dell Inspiron 3", 933 .matches = { 934 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 935 DMI_MATCH(DMI_PRODUCT_NAME, "MM061"), 936 }, 937 }, 938 { 939 .ident = "Dell Inspiron 3", 940 .matches = { 941 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 942 DMI_MATCH(DMI_PRODUCT_NAME, "MP061"), 943 }, 944 }, 945 { 946 .ident = "Dell Precision 490", 947 .matches = { 948 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 949 DMI_MATCH(DMI_PRODUCT_NAME, 950 "Precision WorkStation 490"), 951 }, 952 .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490], 953 }, 954 { 955 .ident = "Dell Precision", 956 .matches = { 957 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 958 DMI_MATCH(DMI_PRODUCT_NAME, "Precision"), 959 }, 960 }, 961 { 962 .ident = "Dell Vostro", 963 .matches = { 964 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 965 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"), 966 }, 967 }, 968 { 969 .ident = "Dell XPS421", 970 .matches = { 971 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 972 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"), 973 }, 974 }, 975 { 976 .ident = "Dell Studio", 977 .matches = { 978 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 979 DMI_MATCH(DMI_PRODUCT_NAME, "Studio"), 980 }, 981 .driver_data = (void *)&i8k_config_data[DELL_STUDIO], 982 }, 983 { 984 .ident = "Dell XPS 13", 985 .matches = { 986 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 987 DMI_MATCH(DMI_PRODUCT_NAME, "XPS13"), 988 }, 989 .driver_data = (void *)&i8k_config_data[DELL_XPS], 990 }, 991 { 992 .ident = "Dell XPS M140", 993 .matches = { 994 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 995 DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"), 996 }, 997 .driver_data = (void *)&i8k_config_data[DELL_XPS], 998 }, 999 { 1000 .ident = "Dell XPS 15 9560", 1001 .matches = { 1002 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1003 DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9560"), 1004 }, 1005 }, 1006 { 1007 .ident = "Dell XPS 15 9570", 1008 .matches = { 1009 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1010 DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9570"), 1011 }, 1012 }, 1013 { } 1014 }; 1015 1016 MODULE_DEVICE_TABLE(dmi, i8k_dmi_table); 1017 1018 /* 1019 * On some machines once I8K_SMM_GET_FAN_TYPE is issued then CPU fan speed 1020 * randomly going up and down due to bug in Dell SMM or BIOS. Here is blacklist 1021 * of affected Dell machines for which we disallow I8K_SMM_GET_FAN_TYPE call. 1022 * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121 1023 */ 1024 static const struct dmi_system_id i8k_blacklist_fan_type_dmi_table[] __initconst = { 1025 { 1026 .ident = "Dell Studio XPS 8000", 1027 .matches = { 1028 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1029 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000"), 1030 }, 1031 }, 1032 { 1033 .ident = "Dell Studio XPS 8100", 1034 .matches = { 1035 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1036 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"), 1037 }, 1038 }, 1039 { 1040 .ident = "Dell Inspiron 580", 1041 .matches = { 1042 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1043 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 580 "), 1044 }, 1045 }, 1046 { } 1047 }; 1048 1049 /* 1050 * On some machines all fan related SMM functions implemented by Dell BIOS 1051 * firmware freeze kernel for about 500ms. Until Dell fixes these problems fan 1052 * support for affected blacklisted Dell machines stay disabled. 1053 * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=195751 1054 */ 1055 static struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initdata = { 1056 { 1057 .ident = "Dell Inspiron 7720", 1058 .matches = { 1059 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1060 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"), 1061 }, 1062 }, 1063 { 1064 .ident = "Dell Vostro 3360", 1065 .matches = { 1066 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1067 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"), 1068 }, 1069 }, 1070 { 1071 .ident = "Dell XPS13 9333", 1072 .matches = { 1073 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1074 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"), 1075 }, 1076 }, 1077 { } 1078 }; 1079 1080 /* 1081 * Probe for the presence of a supported laptop. 1082 */ 1083 static int __init i8k_probe(void) 1084 { 1085 const struct dmi_system_id *id; 1086 int fan, ret; 1087 1088 /* 1089 * Get DMI information 1090 */ 1091 if (!dmi_check_system(i8k_dmi_table)) { 1092 if (!ignore_dmi && !force) 1093 return -ENODEV; 1094 1095 pr_info("not running on a supported Dell system.\n"); 1096 pr_info("vendor=%s, model=%s, version=%s\n", 1097 i8k_get_dmi_data(DMI_SYS_VENDOR), 1098 i8k_get_dmi_data(DMI_PRODUCT_NAME), 1099 i8k_get_dmi_data(DMI_BIOS_VERSION)); 1100 } 1101 1102 if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) { 1103 pr_warn("broken Dell BIOS detected, disallow fan support\n"); 1104 if (!force) 1105 disallow_fan_support = true; 1106 } 1107 1108 if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) { 1109 pr_warn("broken Dell BIOS detected, disallow fan type call\n"); 1110 if (!force) 1111 disallow_fan_type_call = true; 1112 } 1113 1114 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), 1115 sizeof(bios_version)); 1116 strlcpy(bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), 1117 sizeof(bios_machineid)); 1118 1119 /* 1120 * Get SMM Dell signature 1121 */ 1122 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) && 1123 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) { 1124 pr_err("unable to get SMM Dell signature\n"); 1125 if (!force) 1126 return -ENODEV; 1127 } 1128 1129 /* 1130 * Set fan multiplier and maximal fan speed from dmi config 1131 * Values specified in module parameters override values from dmi 1132 */ 1133 id = dmi_first_match(i8k_dmi_table); 1134 if (id && id->driver_data) { 1135 const struct i8k_config_data *conf = id->driver_data; 1136 if (!fan_mult && conf->fan_mult) 1137 fan_mult = conf->fan_mult; 1138 if (!fan_max && conf->fan_max) 1139 fan_max = conf->fan_max; 1140 } 1141 1142 i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */ 1143 i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max); 1144 1145 if (!fan_mult) { 1146 /* 1147 * Autodetect fan multiplier based on nominal rpm 1148 * If fan reports rpm value too high then set multiplier to 1 1149 */ 1150 for (fan = 0; fan < 2; ++fan) { 1151 ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max); 1152 if (ret < 0) 1153 continue; 1154 if (ret > I8K_FAN_MAX_RPM) 1155 i8k_fan_mult = 1; 1156 break; 1157 } 1158 } else { 1159 /* Fan multiplier was specified in module param or in dmi */ 1160 i8k_fan_mult = fan_mult; 1161 } 1162 1163 return 0; 1164 } 1165 1166 static int __init i8k_init(void) 1167 { 1168 int err; 1169 1170 /* Are we running on an supported laptop? */ 1171 if (i8k_probe()) 1172 return -ENODEV; 1173 1174 err = i8k_init_hwmon(); 1175 if (err) 1176 return err; 1177 1178 i8k_init_procfs(); 1179 return 0; 1180 } 1181 1182 static void __exit i8k_exit(void) 1183 { 1184 hwmon_device_unregister(i8k_hwmon_dev); 1185 i8k_exit_procfs(); 1186 } 1187 1188 module_init(i8k_init); 1189 module_exit(i8k_exit); 1190