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 80 #define I8K_HWMON_HAVE_TEMP1 (1 << 0) 81 #define I8K_HWMON_HAVE_TEMP2 (1 << 1) 82 #define I8K_HWMON_HAVE_TEMP3 (1 << 2) 83 #define I8K_HWMON_HAVE_TEMP4 (1 << 3) 84 #define I8K_HWMON_HAVE_FAN1 (1 << 4) 85 #define I8K_HWMON_HAVE_FAN2 (1 << 5) 86 #define I8K_HWMON_HAVE_FAN3 (1 << 6) 87 88 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)"); 89 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>"); 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 regs.ebx = fan & 0xff; 246 return i8k_smm(®s) ? : regs.eax & 0xff; 247 } 248 249 /* 250 * Read the fan speed in RPM. 251 */ 252 static int i8k_get_fan_speed(int fan) 253 { 254 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, }; 255 256 regs.ebx = fan & 0xff; 257 return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult; 258 } 259 260 /* 261 * Read the fan type. 262 */ 263 static int _i8k_get_fan_type(int fan) 264 { 265 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, }; 266 267 if (disallow_fan_type_call) 268 return -EINVAL; 269 270 regs.ebx = fan & 0xff; 271 return i8k_smm(®s) ? : regs.eax & 0xff; 272 } 273 274 static int i8k_get_fan_type(int fan) 275 { 276 /* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */ 277 static int types[3] = { INT_MIN, INT_MIN, INT_MIN }; 278 279 if (types[fan] == INT_MIN) 280 types[fan] = _i8k_get_fan_type(fan); 281 282 return types[fan]; 283 } 284 285 /* 286 * Read the fan nominal rpm for specific fan speed. 287 */ 288 static int i8k_get_fan_nominal_speed(int fan, int speed) 289 { 290 struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, }; 291 292 regs.ebx = (fan & 0xff) | (speed << 8); 293 return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult; 294 } 295 296 /* 297 * Set the fan speed (off, low, high). Returns the new fan status. 298 */ 299 static int i8k_set_fan(int fan, int speed) 300 { 301 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, }; 302 303 speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed); 304 regs.ebx = (fan & 0xff) | (speed << 8); 305 306 return i8k_smm(®s) ? : i8k_get_fan_status(fan); 307 } 308 309 static int i8k_get_temp_type(int sensor) 310 { 311 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, }; 312 313 regs.ebx = sensor & 0xff; 314 return i8k_smm(®s) ? : regs.eax & 0xff; 315 } 316 317 /* 318 * Read the cpu temperature. 319 */ 320 static int _i8k_get_temp(int sensor) 321 { 322 struct smm_regs regs = { 323 .eax = I8K_SMM_GET_TEMP, 324 .ebx = sensor & 0xff, 325 }; 326 327 return i8k_smm(®s) ? : regs.eax & 0xff; 328 } 329 330 static int i8k_get_temp(int sensor) 331 { 332 int temp = _i8k_get_temp(sensor); 333 334 /* 335 * Sometimes the temperature sensor returns 0x99, which is out of range. 336 * In this case we retry (once) before returning an error. 337 # 1003655137 00000058 00005a4b 338 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees 339 # 1003655139 00000054 00005c52 340 */ 341 if (temp == 0x99) { 342 msleep(100); 343 temp = _i8k_get_temp(sensor); 344 } 345 /* 346 * Return -ENODATA for all invalid temperatures. 347 * 348 * Known instances are the 0x99 value as seen above as well as 349 * 0xc1 (193), which may be returned when trying to read the GPU 350 * temperature if the system supports a GPU and it is currently 351 * turned off. 352 */ 353 if (temp > I8K_MAX_TEMP) 354 return -ENODATA; 355 356 return temp; 357 } 358 359 static int i8k_get_dell_signature(int req_fn) 360 { 361 struct smm_regs regs = { .eax = req_fn, }; 362 int rc; 363 364 rc = i8k_smm(®s); 365 if (rc < 0) 366 return rc; 367 368 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1; 369 } 370 371 #if IS_ENABLED(CONFIG_I8K) 372 373 /* 374 * Read the Fn key status. 375 */ 376 static int i8k_get_fn_status(void) 377 { 378 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, }; 379 int rc; 380 381 rc = i8k_smm(®s); 382 if (rc < 0) 383 return rc; 384 385 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) { 386 case I8K_FN_UP: 387 return I8K_VOL_UP; 388 case I8K_FN_DOWN: 389 return I8K_VOL_DOWN; 390 case I8K_FN_MUTE: 391 return I8K_VOL_MUTE; 392 default: 393 return 0; 394 } 395 } 396 397 /* 398 * Read the power status. 399 */ 400 static int i8k_get_power_status(void) 401 { 402 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, }; 403 int rc; 404 405 rc = i8k_smm(®s); 406 if (rc < 0) 407 return rc; 408 409 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY; 410 } 411 412 /* 413 * Procfs interface 414 */ 415 416 static int 417 i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg) 418 { 419 int val = 0; 420 int speed; 421 unsigned char buff[16]; 422 int __user *argp = (int __user *)arg; 423 424 if (!argp) 425 return -EINVAL; 426 427 switch (cmd) { 428 case I8K_BIOS_VERSION: 429 if (!isdigit(bios_version[0]) || !isdigit(bios_version[1]) || 430 !isdigit(bios_version[2])) 431 return -EINVAL; 432 433 val = (bios_version[0] << 16) | 434 (bios_version[1] << 8) | bios_version[2]; 435 break; 436 437 case I8K_MACHINE_ID: 438 if (restricted && !capable(CAP_SYS_ADMIN)) 439 return -EPERM; 440 441 memset(buff, 0, sizeof(buff)); 442 strlcpy(buff, bios_machineid, sizeof(buff)); 443 break; 444 445 case I8K_FN_STATUS: 446 val = i8k_get_fn_status(); 447 break; 448 449 case I8K_POWER_STATUS: 450 val = i8k_get_power_status(); 451 break; 452 453 case I8K_GET_TEMP: 454 val = i8k_get_temp(0); 455 break; 456 457 case I8K_GET_SPEED: 458 if (copy_from_user(&val, argp, sizeof(int))) 459 return -EFAULT; 460 461 val = i8k_get_fan_speed(val); 462 break; 463 464 case I8K_GET_FAN: 465 if (copy_from_user(&val, argp, sizeof(int))) 466 return -EFAULT; 467 468 val = i8k_get_fan_status(val); 469 break; 470 471 case I8K_SET_FAN: 472 if (restricted && !capable(CAP_SYS_ADMIN)) 473 return -EPERM; 474 475 if (copy_from_user(&val, argp, sizeof(int))) 476 return -EFAULT; 477 478 if (copy_from_user(&speed, argp + 1, sizeof(int))) 479 return -EFAULT; 480 481 val = i8k_set_fan(val, speed); 482 break; 483 484 default: 485 return -EINVAL; 486 } 487 488 if (val < 0) 489 return val; 490 491 switch (cmd) { 492 case I8K_BIOS_VERSION: 493 if (copy_to_user(argp, &val, 4)) 494 return -EFAULT; 495 496 break; 497 case I8K_MACHINE_ID: 498 if (copy_to_user(argp, buff, 16)) 499 return -EFAULT; 500 501 break; 502 default: 503 if (copy_to_user(argp, &val, sizeof(int))) 504 return -EFAULT; 505 506 break; 507 } 508 509 return 0; 510 } 511 512 static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) 513 { 514 long ret; 515 516 mutex_lock(&i8k_mutex); 517 ret = i8k_ioctl_unlocked(fp, cmd, arg); 518 mutex_unlock(&i8k_mutex); 519 520 return ret; 521 } 522 523 /* 524 * Print the information for /proc/i8k. 525 */ 526 static int i8k_proc_show(struct seq_file *seq, void *offset) 527 { 528 int fn_key, cpu_temp, ac_power; 529 int left_fan, right_fan, left_speed, right_speed; 530 531 cpu_temp = i8k_get_temp(0); /* 11100 µs */ 532 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */ 533 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */ 534 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */ 535 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */ 536 fn_key = i8k_get_fn_status(); /* 750 µs */ 537 if (power_status) 538 ac_power = i8k_get_power_status(); /* 14700 µs */ 539 else 540 ac_power = -1; 541 542 /* 543 * Info: 544 * 545 * 1) Format version (this will change if format changes) 546 * 2) BIOS version 547 * 3) BIOS machine ID 548 * 4) Cpu temperature 549 * 5) Left fan status 550 * 6) Right fan status 551 * 7) Left fan speed 552 * 8) Right fan speed 553 * 9) AC power 554 * 10) Fn Key status 555 */ 556 seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n", 557 I8K_PROC_FMT, 558 bios_version, 559 (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : bios_machineid, 560 cpu_temp, 561 left_fan, right_fan, left_speed, right_speed, 562 ac_power, fn_key); 563 564 return 0; 565 } 566 567 static int i8k_open_fs(struct inode *inode, struct file *file) 568 { 569 return single_open(file, i8k_proc_show, NULL); 570 } 571 572 static const struct file_operations i8k_fops = { 573 .owner = THIS_MODULE, 574 .open = i8k_open_fs, 575 .read = seq_read, 576 .llseek = seq_lseek, 577 .release = single_release, 578 .unlocked_ioctl = i8k_ioctl, 579 }; 580 581 static void __init i8k_init_procfs(void) 582 { 583 /* Register the proc entry */ 584 proc_create("i8k", 0, NULL, &i8k_fops); 585 } 586 587 static void __exit i8k_exit_procfs(void) 588 { 589 remove_proc_entry("i8k", NULL); 590 } 591 592 #else 593 594 static inline void __init i8k_init_procfs(void) 595 { 596 } 597 598 static inline void __exit i8k_exit_procfs(void) 599 { 600 } 601 602 #endif 603 604 /* 605 * Hwmon interface 606 */ 607 608 static ssize_t i8k_hwmon_show_temp_label(struct device *dev, 609 struct device_attribute *devattr, 610 char *buf) 611 { 612 static const char * const labels[] = { 613 "CPU", 614 "GPU", 615 "SODIMM", 616 "Other", 617 "Ambient", 618 "Other", 619 }; 620 int index = to_sensor_dev_attr(devattr)->index; 621 int type; 622 623 type = i8k_get_temp_type(index); 624 if (type < 0) 625 return type; 626 if (type >= ARRAY_SIZE(labels)) 627 type = ARRAY_SIZE(labels) - 1; 628 return sprintf(buf, "%s\n", labels[type]); 629 } 630 631 static ssize_t i8k_hwmon_show_temp(struct device *dev, 632 struct device_attribute *devattr, 633 char *buf) 634 { 635 int index = to_sensor_dev_attr(devattr)->index; 636 int temp; 637 638 temp = i8k_get_temp(index); 639 if (temp < 0) 640 return temp; 641 return sprintf(buf, "%d\n", temp * 1000); 642 } 643 644 static ssize_t i8k_hwmon_show_fan_label(struct device *dev, 645 struct device_attribute *devattr, 646 char *buf) 647 { 648 static const char * const labels[] = { 649 "Processor Fan", 650 "Motherboard Fan", 651 "Video Fan", 652 "Power Supply Fan", 653 "Chipset Fan", 654 "Other Fan", 655 }; 656 int index = to_sensor_dev_attr(devattr)->index; 657 bool dock = false; 658 int type; 659 660 type = i8k_get_fan_type(index); 661 if (type < 0) 662 return type; 663 664 if (type & 0x10) { 665 dock = true; 666 type &= 0x0F; 667 } 668 669 if (type >= ARRAY_SIZE(labels)) 670 type = (ARRAY_SIZE(labels) - 1); 671 672 return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]); 673 } 674 675 static ssize_t i8k_hwmon_show_fan(struct device *dev, 676 struct device_attribute *devattr, 677 char *buf) 678 { 679 int index = to_sensor_dev_attr(devattr)->index; 680 int fan_speed; 681 682 fan_speed = i8k_get_fan_speed(index); 683 if (fan_speed < 0) 684 return fan_speed; 685 return sprintf(buf, "%d\n", fan_speed); 686 } 687 688 static ssize_t i8k_hwmon_show_pwm(struct device *dev, 689 struct device_attribute *devattr, 690 char *buf) 691 { 692 int index = to_sensor_dev_attr(devattr)->index; 693 int status; 694 695 status = i8k_get_fan_status(index); 696 if (status < 0) 697 return -EIO; 698 return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255)); 699 } 700 701 static ssize_t i8k_hwmon_set_pwm(struct device *dev, 702 struct device_attribute *attr, 703 const char *buf, size_t count) 704 { 705 int index = to_sensor_dev_attr(attr)->index; 706 unsigned long val; 707 int err; 708 709 err = kstrtoul(buf, 10, &val); 710 if (err) 711 return err; 712 val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max); 713 714 mutex_lock(&i8k_mutex); 715 err = i8k_set_fan(index, val); 716 mutex_unlock(&i8k_mutex); 717 718 return err < 0 ? -EIO : count; 719 } 720 721 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0); 722 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL, 723 0); 724 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1); 725 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL, 726 1); 727 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2); 728 static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL, 729 2); 730 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3); 731 static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL, 732 3); 733 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 0); 734 static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL, 735 0); 736 static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm, 737 i8k_hwmon_set_pwm, 0); 738 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 739 1); 740 static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL, 741 1); 742 static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm, 743 i8k_hwmon_set_pwm, 1); 744 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 745 2); 746 static SENSOR_DEVICE_ATTR(fan3_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL, 747 2); 748 static SENSOR_DEVICE_ATTR(pwm3, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm, 749 i8k_hwmon_set_pwm, 2); 750 751 static struct attribute *i8k_attrs[] = { 752 &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */ 753 &sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */ 754 &sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */ 755 &sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */ 756 &sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */ 757 &sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */ 758 &sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */ 759 &sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */ 760 &sensor_dev_attr_fan1_input.dev_attr.attr, /* 8 */ 761 &sensor_dev_attr_fan1_label.dev_attr.attr, /* 9 */ 762 &sensor_dev_attr_pwm1.dev_attr.attr, /* 10 */ 763 &sensor_dev_attr_fan2_input.dev_attr.attr, /* 11 */ 764 &sensor_dev_attr_fan2_label.dev_attr.attr, /* 12 */ 765 &sensor_dev_attr_pwm2.dev_attr.attr, /* 13 */ 766 &sensor_dev_attr_fan3_input.dev_attr.attr, /* 14 */ 767 &sensor_dev_attr_fan3_label.dev_attr.attr, /* 15 */ 768 &sensor_dev_attr_pwm3.dev_attr.attr, /* 16 */ 769 NULL 770 }; 771 772 static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr, 773 int index) 774 { 775 if (disallow_fan_type_call && 776 (index == 9 || index == 12 || index == 15)) 777 return 0; 778 if (index >= 0 && index <= 1 && 779 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1)) 780 return 0; 781 if (index >= 2 && index <= 3 && 782 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2)) 783 return 0; 784 if (index >= 4 && index <= 5 && 785 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3)) 786 return 0; 787 if (index >= 6 && index <= 7 && 788 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4)) 789 return 0; 790 if (index >= 8 && index <= 10 && 791 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1)) 792 return 0; 793 if (index >= 11 && index <= 13 && 794 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2)) 795 return 0; 796 if (index >= 14 && index <= 16 && 797 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN3)) 798 return 0; 799 800 return attr->mode; 801 } 802 803 static const struct attribute_group i8k_group = { 804 .attrs = i8k_attrs, 805 .is_visible = i8k_is_visible, 806 }; 807 __ATTRIBUTE_GROUPS(i8k); 808 809 static int __init i8k_init_hwmon(void) 810 { 811 int err; 812 813 i8k_hwmon_flags = 0; 814 815 /* CPU temperature attributes, if temperature type is OK */ 816 err = i8k_get_temp_type(0); 817 if (err >= 0) 818 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1; 819 /* check for additional temperature sensors */ 820 err = i8k_get_temp_type(1); 821 if (err >= 0) 822 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2; 823 err = i8k_get_temp_type(2); 824 if (err >= 0) 825 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3; 826 err = i8k_get_temp_type(3); 827 if (err >= 0) 828 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4; 829 830 /* First fan attributes, if fan status or type is OK */ 831 err = i8k_get_fan_status(0); 832 if (err < 0) 833 err = i8k_get_fan_type(0); 834 if (err >= 0) 835 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1; 836 837 /* Second fan attributes, if fan status or type is OK */ 838 err = i8k_get_fan_status(1); 839 if (err < 0) 840 err = i8k_get_fan_type(1); 841 if (err >= 0) 842 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2; 843 844 /* Third fan attributes, if fan status or type is OK */ 845 err = i8k_get_fan_status(2); 846 if (err < 0) 847 err = i8k_get_fan_type(2); 848 if (err >= 0) 849 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN3; 850 851 i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm", 852 NULL, i8k_groups); 853 if (IS_ERR(i8k_hwmon_dev)) { 854 err = PTR_ERR(i8k_hwmon_dev); 855 i8k_hwmon_dev = NULL; 856 pr_err("hwmon registration failed (%d)\n", err); 857 return err; 858 } 859 return 0; 860 } 861 862 struct i8k_config_data { 863 uint fan_mult; 864 uint fan_max; 865 }; 866 867 enum i8k_configs { 868 DELL_LATITUDE_D520, 869 DELL_PRECISION_490, 870 DELL_STUDIO, 871 DELL_XPS, 872 }; 873 874 static const struct i8k_config_data i8k_config_data[] = { 875 [DELL_LATITUDE_D520] = { 876 .fan_mult = 1, 877 .fan_max = I8K_FAN_TURBO, 878 }, 879 [DELL_PRECISION_490] = { 880 .fan_mult = 1, 881 .fan_max = I8K_FAN_TURBO, 882 }, 883 [DELL_STUDIO] = { 884 .fan_mult = 1, 885 .fan_max = I8K_FAN_HIGH, 886 }, 887 [DELL_XPS] = { 888 .fan_mult = 1, 889 .fan_max = I8K_FAN_HIGH, 890 }, 891 }; 892 893 static struct dmi_system_id i8k_dmi_table[] __initdata = { 894 { 895 .ident = "Dell Inspiron", 896 .matches = { 897 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"), 898 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"), 899 }, 900 }, 901 { 902 .ident = "Dell Latitude", 903 .matches = { 904 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"), 905 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"), 906 }, 907 }, 908 { 909 .ident = "Dell Inspiron 2", 910 .matches = { 911 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 912 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"), 913 }, 914 }, 915 { 916 .ident = "Dell Latitude D520", 917 .matches = { 918 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 919 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"), 920 }, 921 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520], 922 }, 923 { 924 .ident = "Dell Latitude 2", 925 .matches = { 926 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 927 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"), 928 }, 929 }, 930 { /* UK Inspiron 6400 */ 931 .ident = "Dell Inspiron 3", 932 .matches = { 933 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 934 DMI_MATCH(DMI_PRODUCT_NAME, "MM061"), 935 }, 936 }, 937 { 938 .ident = "Dell Inspiron 3", 939 .matches = { 940 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 941 DMI_MATCH(DMI_PRODUCT_NAME, "MP061"), 942 }, 943 }, 944 { 945 .ident = "Dell Precision 490", 946 .matches = { 947 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 948 DMI_MATCH(DMI_PRODUCT_NAME, 949 "Precision WorkStation 490"), 950 }, 951 .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490], 952 }, 953 { 954 .ident = "Dell Precision", 955 .matches = { 956 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 957 DMI_MATCH(DMI_PRODUCT_NAME, "Precision"), 958 }, 959 }, 960 { 961 .ident = "Dell Vostro", 962 .matches = { 963 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 964 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"), 965 }, 966 }, 967 { 968 .ident = "Dell XPS421", 969 .matches = { 970 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 971 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"), 972 }, 973 }, 974 { 975 .ident = "Dell Studio", 976 .matches = { 977 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 978 DMI_MATCH(DMI_PRODUCT_NAME, "Studio"), 979 }, 980 .driver_data = (void *)&i8k_config_data[DELL_STUDIO], 981 }, 982 { 983 .ident = "Dell XPS 13", 984 .matches = { 985 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 986 DMI_MATCH(DMI_PRODUCT_NAME, "XPS13"), 987 }, 988 .driver_data = (void *)&i8k_config_data[DELL_XPS], 989 }, 990 { 991 .ident = "Dell XPS M140", 992 .matches = { 993 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 994 DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"), 995 }, 996 .driver_data = (void *)&i8k_config_data[DELL_XPS], 997 }, 998 { } 999 }; 1000 1001 MODULE_DEVICE_TABLE(dmi, i8k_dmi_table); 1002 1003 /* 1004 * On some machines once I8K_SMM_GET_FAN_TYPE is issued then CPU fan speed 1005 * randomly going up and down due to bug in Dell SMM or BIOS. Here is blacklist 1006 * of affected Dell machines for which we disallow I8K_SMM_GET_FAN_TYPE call. 1007 * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121 1008 */ 1009 static struct dmi_system_id i8k_blacklist_fan_type_dmi_table[] __initdata = { 1010 { 1011 .ident = "Dell Studio XPS 8000", 1012 .matches = { 1013 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1014 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000"), 1015 }, 1016 }, 1017 { 1018 .ident = "Dell Studio XPS 8100", 1019 .matches = { 1020 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1021 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"), 1022 }, 1023 }, 1024 { 1025 .ident = "Dell Inspiron 580", 1026 .matches = { 1027 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 1028 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 580 "), 1029 }, 1030 }, 1031 { } 1032 }; 1033 1034 /* 1035 * Probe for the presence of a supported laptop. 1036 */ 1037 static int __init i8k_probe(void) 1038 { 1039 const struct dmi_system_id *id; 1040 int fan, ret; 1041 1042 /* 1043 * Get DMI information 1044 */ 1045 if (!dmi_check_system(i8k_dmi_table)) { 1046 if (!ignore_dmi && !force) 1047 return -ENODEV; 1048 1049 pr_info("not running on a supported Dell system.\n"); 1050 pr_info("vendor=%s, model=%s, version=%s\n", 1051 i8k_get_dmi_data(DMI_SYS_VENDOR), 1052 i8k_get_dmi_data(DMI_PRODUCT_NAME), 1053 i8k_get_dmi_data(DMI_BIOS_VERSION)); 1054 } 1055 1056 if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) 1057 disallow_fan_type_call = true; 1058 1059 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), 1060 sizeof(bios_version)); 1061 strlcpy(bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), 1062 sizeof(bios_machineid)); 1063 1064 /* 1065 * Get SMM Dell signature 1066 */ 1067 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) && 1068 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) { 1069 pr_err("unable to get SMM Dell signature\n"); 1070 if (!force) 1071 return -ENODEV; 1072 } 1073 1074 /* 1075 * Set fan multiplier and maximal fan speed from dmi config 1076 * Values specified in module parameters override values from dmi 1077 */ 1078 id = dmi_first_match(i8k_dmi_table); 1079 if (id && id->driver_data) { 1080 const struct i8k_config_data *conf = id->driver_data; 1081 if (!fan_mult && conf->fan_mult) 1082 fan_mult = conf->fan_mult; 1083 if (!fan_max && conf->fan_max) 1084 fan_max = conf->fan_max; 1085 } 1086 1087 i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */ 1088 i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max); 1089 1090 if (!fan_mult) { 1091 /* 1092 * Autodetect fan multiplier based on nominal rpm 1093 * If fan reports rpm value too high then set multiplier to 1 1094 */ 1095 for (fan = 0; fan < 2; ++fan) { 1096 ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max); 1097 if (ret < 0) 1098 continue; 1099 if (ret > I8K_FAN_MAX_RPM) 1100 i8k_fan_mult = 1; 1101 break; 1102 } 1103 } else { 1104 /* Fan multiplier was specified in module param or in dmi */ 1105 i8k_fan_mult = fan_mult; 1106 } 1107 1108 return 0; 1109 } 1110 1111 static int __init i8k_init(void) 1112 { 1113 int err; 1114 1115 /* Are we running on an supported laptop? */ 1116 if (i8k_probe()) 1117 return -ENODEV; 1118 1119 err = i8k_init_hwmon(); 1120 if (err) 1121 return err; 1122 1123 i8k_init_procfs(); 1124 return 0; 1125 } 1126 1127 static void __exit i8k_exit(void) 1128 { 1129 hwmon_device_unregister(i8k_hwmon_dev); 1130 i8k_exit_procfs(); 1131 } 1132 1133 module_init(i8k_init); 1134 module_exit(i8k_exit); 1135