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/delay.h> 25 #include <linux/module.h> 26 #include <linux/types.h> 27 #include <linux/init.h> 28 #include <linux/proc_fs.h> 29 #include <linux/seq_file.h> 30 #include <linux/dmi.h> 31 #include <linux/capability.h> 32 #include <linux/mutex.h> 33 #include <linux/hwmon.h> 34 #include <linux/hwmon-sysfs.h> 35 #include <linux/uaccess.h> 36 #include <linux/io.h> 37 #include <linux/sched.h> 38 39 #include <linux/i8k.h> 40 41 #define I8K_SMM_FN_STATUS 0x0025 42 #define I8K_SMM_POWER_STATUS 0x0069 43 #define I8K_SMM_SET_FAN 0x01a3 44 #define I8K_SMM_GET_FAN 0x00a3 45 #define I8K_SMM_GET_SPEED 0x02a3 46 #define I8K_SMM_GET_FAN_TYPE 0x03a3 47 #define I8K_SMM_GET_NOM_SPEED 0x04a3 48 #define I8K_SMM_GET_TEMP 0x10a3 49 #define I8K_SMM_GET_TEMP_TYPE 0x11a3 50 #define I8K_SMM_GET_DELL_SIG1 0xfea3 51 #define I8K_SMM_GET_DELL_SIG2 0xffa3 52 53 #define I8K_FAN_MULT 30 54 #define I8K_FAN_MAX_RPM 30000 55 #define I8K_MAX_TEMP 127 56 57 #define I8K_FN_NONE 0x00 58 #define I8K_FN_UP 0x01 59 #define I8K_FN_DOWN 0x02 60 #define I8K_FN_MUTE 0x04 61 #define I8K_FN_MASK 0x07 62 #define I8K_FN_SHIFT 8 63 64 #define I8K_POWER_AC 0x05 65 #define I8K_POWER_BATTERY 0x01 66 67 static DEFINE_MUTEX(i8k_mutex); 68 static char bios_version[4]; 69 static struct device *i8k_hwmon_dev; 70 static u32 i8k_hwmon_flags; 71 static uint i8k_fan_mult = I8K_FAN_MULT; 72 static uint i8k_pwm_mult; 73 static uint i8k_fan_max = I8K_FAN_HIGH; 74 75 #define I8K_HWMON_HAVE_TEMP1 (1 << 0) 76 #define I8K_HWMON_HAVE_TEMP2 (1 << 1) 77 #define I8K_HWMON_HAVE_TEMP3 (1 << 2) 78 #define I8K_HWMON_HAVE_TEMP4 (1 << 3) 79 #define I8K_HWMON_HAVE_FAN1 (1 << 4) 80 #define I8K_HWMON_HAVE_FAN2 (1 << 5) 81 82 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)"); 83 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>"); 84 MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver"); 85 MODULE_LICENSE("GPL"); 86 MODULE_ALIAS("i8k"); 87 88 static bool force; 89 module_param(force, bool, 0); 90 MODULE_PARM_DESC(force, "Force loading without checking for supported models"); 91 92 static bool ignore_dmi; 93 module_param(ignore_dmi, bool, 0); 94 MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match"); 95 96 #if IS_ENABLED(CONFIG_I8K) 97 static bool restricted; 98 module_param(restricted, bool, 0); 99 MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set"); 100 101 static bool power_status; 102 module_param(power_status, bool, 0600); 103 MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k"); 104 #endif 105 106 static uint fan_mult; 107 module_param(fan_mult, uint, 0); 108 MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)"); 109 110 static uint fan_max; 111 module_param(fan_max, uint, 0); 112 MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)"); 113 114 struct smm_regs { 115 unsigned int eax; 116 unsigned int ebx __packed; 117 unsigned int ecx __packed; 118 unsigned int edx __packed; 119 unsigned int esi __packed; 120 unsigned int edi __packed; 121 }; 122 123 static inline const char *i8k_get_dmi_data(int field) 124 { 125 const char *dmi_data = dmi_get_system_info(field); 126 127 return dmi_data && *dmi_data ? dmi_data : "?"; 128 } 129 130 /* 131 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard. 132 */ 133 static int i8k_smm(struct smm_regs *regs) 134 { 135 int rc; 136 int eax = regs->eax; 137 cpumask_var_t old_mask; 138 139 /* SMM requires CPU 0 */ 140 if (!alloc_cpumask_var(&old_mask, GFP_KERNEL)) 141 return -ENOMEM; 142 cpumask_copy(old_mask, ¤t->cpus_allowed); 143 rc = set_cpus_allowed_ptr(current, cpumask_of(0)); 144 if (rc) 145 goto out; 146 if (smp_processor_id() != 0) { 147 rc = -EBUSY; 148 goto out; 149 } 150 151 #if defined(CONFIG_X86_64) 152 asm volatile("pushq %%rax\n\t" 153 "movl 0(%%rax),%%edx\n\t" 154 "pushq %%rdx\n\t" 155 "movl 4(%%rax),%%ebx\n\t" 156 "movl 8(%%rax),%%ecx\n\t" 157 "movl 12(%%rax),%%edx\n\t" 158 "movl 16(%%rax),%%esi\n\t" 159 "movl 20(%%rax),%%edi\n\t" 160 "popq %%rax\n\t" 161 "out %%al,$0xb2\n\t" 162 "out %%al,$0x84\n\t" 163 "xchgq %%rax,(%%rsp)\n\t" 164 "movl %%ebx,4(%%rax)\n\t" 165 "movl %%ecx,8(%%rax)\n\t" 166 "movl %%edx,12(%%rax)\n\t" 167 "movl %%esi,16(%%rax)\n\t" 168 "movl %%edi,20(%%rax)\n\t" 169 "popq %%rdx\n\t" 170 "movl %%edx,0(%%rax)\n\t" 171 "pushfq\n\t" 172 "popq %%rax\n\t" 173 "andl $1,%%eax\n" 174 : "=a"(rc) 175 : "a"(regs) 176 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); 177 #else 178 asm volatile("pushl %%eax\n\t" 179 "movl 0(%%eax),%%edx\n\t" 180 "push %%edx\n\t" 181 "movl 4(%%eax),%%ebx\n\t" 182 "movl 8(%%eax),%%ecx\n\t" 183 "movl 12(%%eax),%%edx\n\t" 184 "movl 16(%%eax),%%esi\n\t" 185 "movl 20(%%eax),%%edi\n\t" 186 "popl %%eax\n\t" 187 "out %%al,$0xb2\n\t" 188 "out %%al,$0x84\n\t" 189 "xchgl %%eax,(%%esp)\n\t" 190 "movl %%ebx,4(%%eax)\n\t" 191 "movl %%ecx,8(%%eax)\n\t" 192 "movl %%edx,12(%%eax)\n\t" 193 "movl %%esi,16(%%eax)\n\t" 194 "movl %%edi,20(%%eax)\n\t" 195 "popl %%edx\n\t" 196 "movl %%edx,0(%%eax)\n\t" 197 "lahf\n\t" 198 "shrl $8,%%eax\n\t" 199 "andl $1,%%eax\n" 200 : "=a"(rc) 201 : "a"(regs) 202 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); 203 #endif 204 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax) 205 rc = -EINVAL; 206 207 out: 208 set_cpus_allowed_ptr(current, old_mask); 209 free_cpumask_var(old_mask); 210 return rc; 211 } 212 213 /* 214 * Read the fan status. 215 */ 216 static int i8k_get_fan_status(int fan) 217 { 218 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, }; 219 220 regs.ebx = fan & 0xff; 221 return i8k_smm(®s) ? : regs.eax & 0xff; 222 } 223 224 /* 225 * Read the fan speed in RPM. 226 */ 227 static int i8k_get_fan_speed(int fan) 228 { 229 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, }; 230 231 regs.ebx = fan & 0xff; 232 return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult; 233 } 234 235 /* 236 * Read the fan type. 237 */ 238 static int i8k_get_fan_type(int fan) 239 { 240 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, }; 241 242 regs.ebx = fan & 0xff; 243 return i8k_smm(®s) ? : regs.eax & 0xff; 244 } 245 246 /* 247 * Read the fan nominal rpm for specific fan speed. 248 */ 249 static int i8k_get_fan_nominal_speed(int fan, int speed) 250 { 251 struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, }; 252 253 regs.ebx = (fan & 0xff) | (speed << 8); 254 return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult; 255 } 256 257 /* 258 * Set the fan speed (off, low, high). Returns the new fan status. 259 */ 260 static int i8k_set_fan(int fan, int speed) 261 { 262 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, }; 263 264 speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed); 265 regs.ebx = (fan & 0xff) | (speed << 8); 266 267 return i8k_smm(®s) ? : i8k_get_fan_status(fan); 268 } 269 270 static int i8k_get_temp_type(int sensor) 271 { 272 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, }; 273 274 regs.ebx = sensor & 0xff; 275 return i8k_smm(®s) ? : regs.eax & 0xff; 276 } 277 278 /* 279 * Read the cpu temperature. 280 */ 281 static int _i8k_get_temp(int sensor) 282 { 283 struct smm_regs regs = { 284 .eax = I8K_SMM_GET_TEMP, 285 .ebx = sensor & 0xff, 286 }; 287 288 return i8k_smm(®s) ? : regs.eax & 0xff; 289 } 290 291 static int i8k_get_temp(int sensor) 292 { 293 int temp = _i8k_get_temp(sensor); 294 295 /* 296 * Sometimes the temperature sensor returns 0x99, which is out of range. 297 * In this case we retry (once) before returning an error. 298 # 1003655137 00000058 00005a4b 299 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees 300 # 1003655139 00000054 00005c52 301 */ 302 if (temp == 0x99) { 303 msleep(100); 304 temp = _i8k_get_temp(sensor); 305 } 306 /* 307 * Return -ENODATA for all invalid temperatures. 308 * 309 * Known instances are the 0x99 value as seen above as well as 310 * 0xc1 (193), which may be returned when trying to read the GPU 311 * temperature if the system supports a GPU and it is currently 312 * turned off. 313 */ 314 if (temp > I8K_MAX_TEMP) 315 return -ENODATA; 316 317 return temp; 318 } 319 320 static int i8k_get_dell_signature(int req_fn) 321 { 322 struct smm_regs regs = { .eax = req_fn, }; 323 int rc; 324 325 rc = i8k_smm(®s); 326 if (rc < 0) 327 return rc; 328 329 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1; 330 } 331 332 #if IS_ENABLED(CONFIG_I8K) 333 334 /* 335 * Read the Fn key status. 336 */ 337 static int i8k_get_fn_status(void) 338 { 339 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, }; 340 int rc; 341 342 rc = i8k_smm(®s); 343 if (rc < 0) 344 return rc; 345 346 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) { 347 case I8K_FN_UP: 348 return I8K_VOL_UP; 349 case I8K_FN_DOWN: 350 return I8K_VOL_DOWN; 351 case I8K_FN_MUTE: 352 return I8K_VOL_MUTE; 353 default: 354 return 0; 355 } 356 } 357 358 /* 359 * Read the power status. 360 */ 361 static int i8k_get_power_status(void) 362 { 363 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, }; 364 int rc; 365 366 rc = i8k_smm(®s); 367 if (rc < 0) 368 return rc; 369 370 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY; 371 } 372 373 /* 374 * Procfs interface 375 */ 376 377 static int 378 i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg) 379 { 380 int val = 0; 381 int speed; 382 unsigned char buff[16]; 383 int __user *argp = (int __user *)arg; 384 385 if (!argp) 386 return -EINVAL; 387 388 switch (cmd) { 389 case I8K_BIOS_VERSION: 390 val = (bios_version[0] << 16) | 391 (bios_version[1] << 8) | bios_version[2]; 392 break; 393 394 case I8K_MACHINE_ID: 395 memset(buff, 0, 16); 396 strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), 397 sizeof(buff)); 398 break; 399 400 case I8K_FN_STATUS: 401 val = i8k_get_fn_status(); 402 break; 403 404 case I8K_POWER_STATUS: 405 val = i8k_get_power_status(); 406 break; 407 408 case I8K_GET_TEMP: 409 val = i8k_get_temp(0); 410 break; 411 412 case I8K_GET_SPEED: 413 if (copy_from_user(&val, argp, sizeof(int))) 414 return -EFAULT; 415 416 val = i8k_get_fan_speed(val); 417 break; 418 419 case I8K_GET_FAN: 420 if (copy_from_user(&val, argp, sizeof(int))) 421 return -EFAULT; 422 423 val = i8k_get_fan_status(val); 424 break; 425 426 case I8K_SET_FAN: 427 if (restricted && !capable(CAP_SYS_ADMIN)) 428 return -EPERM; 429 430 if (copy_from_user(&val, argp, sizeof(int))) 431 return -EFAULT; 432 433 if (copy_from_user(&speed, argp + 1, sizeof(int))) 434 return -EFAULT; 435 436 val = i8k_set_fan(val, speed); 437 break; 438 439 default: 440 return -EINVAL; 441 } 442 443 if (val < 0) 444 return val; 445 446 switch (cmd) { 447 case I8K_BIOS_VERSION: 448 if (copy_to_user(argp, &val, 4)) 449 return -EFAULT; 450 451 break; 452 case I8K_MACHINE_ID: 453 if (copy_to_user(argp, buff, 16)) 454 return -EFAULT; 455 456 break; 457 default: 458 if (copy_to_user(argp, &val, sizeof(int))) 459 return -EFAULT; 460 461 break; 462 } 463 464 return 0; 465 } 466 467 static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) 468 { 469 long ret; 470 471 mutex_lock(&i8k_mutex); 472 ret = i8k_ioctl_unlocked(fp, cmd, arg); 473 mutex_unlock(&i8k_mutex); 474 475 return ret; 476 } 477 478 /* 479 * Print the information for /proc/i8k. 480 */ 481 static int i8k_proc_show(struct seq_file *seq, void *offset) 482 { 483 int fn_key, cpu_temp, ac_power; 484 int left_fan, right_fan, left_speed, right_speed; 485 486 cpu_temp = i8k_get_temp(0); /* 11100 µs */ 487 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */ 488 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */ 489 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */ 490 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */ 491 fn_key = i8k_get_fn_status(); /* 750 µs */ 492 if (power_status) 493 ac_power = i8k_get_power_status(); /* 14700 µs */ 494 else 495 ac_power = -1; 496 497 /* 498 * Info: 499 * 500 * 1) Format version (this will change if format changes) 501 * 2) BIOS version 502 * 3) BIOS machine ID 503 * 4) Cpu temperature 504 * 5) Left fan status 505 * 6) Right fan status 506 * 7) Left fan speed 507 * 8) Right fan speed 508 * 9) AC power 509 * 10) Fn Key status 510 */ 511 seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n", 512 I8K_PROC_FMT, 513 bios_version, 514 i8k_get_dmi_data(DMI_PRODUCT_SERIAL), 515 cpu_temp, 516 left_fan, right_fan, left_speed, right_speed, 517 ac_power, fn_key); 518 519 return 0; 520 } 521 522 static int i8k_open_fs(struct inode *inode, struct file *file) 523 { 524 return single_open(file, i8k_proc_show, NULL); 525 } 526 527 static const struct file_operations i8k_fops = { 528 .owner = THIS_MODULE, 529 .open = i8k_open_fs, 530 .read = seq_read, 531 .llseek = seq_lseek, 532 .release = single_release, 533 .unlocked_ioctl = i8k_ioctl, 534 }; 535 536 static void __init i8k_init_procfs(void) 537 { 538 /* Register the proc entry */ 539 proc_create("i8k", 0, NULL, &i8k_fops); 540 } 541 542 static void __exit i8k_exit_procfs(void) 543 { 544 remove_proc_entry("i8k", NULL); 545 } 546 547 #else 548 549 static inline void __init i8k_init_procfs(void) 550 { 551 } 552 553 static inline void __exit i8k_exit_procfs(void) 554 { 555 } 556 557 #endif 558 559 /* 560 * Hwmon interface 561 */ 562 563 static ssize_t i8k_hwmon_show_temp_label(struct device *dev, 564 struct device_attribute *devattr, 565 char *buf) 566 { 567 static const char * const labels[] = { 568 "CPU", 569 "GPU", 570 "SODIMM", 571 "Other", 572 "Ambient", 573 "Other", 574 }; 575 int index = to_sensor_dev_attr(devattr)->index; 576 int type; 577 578 type = i8k_get_temp_type(index); 579 if (type < 0) 580 return type; 581 if (type >= ARRAY_SIZE(labels)) 582 type = ARRAY_SIZE(labels) - 1; 583 return sprintf(buf, "%s\n", labels[type]); 584 } 585 586 static ssize_t i8k_hwmon_show_temp(struct device *dev, 587 struct device_attribute *devattr, 588 char *buf) 589 { 590 int index = to_sensor_dev_attr(devattr)->index; 591 int temp; 592 593 temp = i8k_get_temp(index); 594 if (temp < 0) 595 return temp; 596 return sprintf(buf, "%d\n", temp * 1000); 597 } 598 599 static ssize_t i8k_hwmon_show_fan_label(struct device *dev, 600 struct device_attribute *devattr, 601 char *buf) 602 { 603 static const char * const labels[] = { 604 "Processor Fan", 605 "Motherboard Fan", 606 "Video Fan", 607 "Power Supply Fan", 608 "Chipset Fan", 609 "Other Fan", 610 }; 611 int index = to_sensor_dev_attr(devattr)->index; 612 bool dock = false; 613 int type; 614 615 type = i8k_get_fan_type(index); 616 if (type < 0) 617 return type; 618 619 if (type & 0x10) { 620 dock = true; 621 type &= 0x0F; 622 } 623 624 if (type >= ARRAY_SIZE(labels)) 625 type = (ARRAY_SIZE(labels) - 1); 626 627 return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]); 628 } 629 630 static ssize_t i8k_hwmon_show_fan(struct device *dev, 631 struct device_attribute *devattr, 632 char *buf) 633 { 634 int index = to_sensor_dev_attr(devattr)->index; 635 int fan_speed; 636 637 fan_speed = i8k_get_fan_speed(index); 638 if (fan_speed < 0) 639 return fan_speed; 640 return sprintf(buf, "%d\n", fan_speed); 641 } 642 643 static ssize_t i8k_hwmon_show_pwm(struct device *dev, 644 struct device_attribute *devattr, 645 char *buf) 646 { 647 int index = to_sensor_dev_attr(devattr)->index; 648 int status; 649 650 status = i8k_get_fan_status(index); 651 if (status < 0) 652 return -EIO; 653 return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255)); 654 } 655 656 static ssize_t i8k_hwmon_set_pwm(struct device *dev, 657 struct device_attribute *attr, 658 const char *buf, size_t count) 659 { 660 int index = to_sensor_dev_attr(attr)->index; 661 unsigned long val; 662 int err; 663 664 err = kstrtoul(buf, 10, &val); 665 if (err) 666 return err; 667 val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max); 668 669 mutex_lock(&i8k_mutex); 670 err = i8k_set_fan(index, val); 671 mutex_unlock(&i8k_mutex); 672 673 return err < 0 ? -EIO : count; 674 } 675 676 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0); 677 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL, 678 0); 679 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1); 680 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL, 681 1); 682 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2); 683 static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL, 684 2); 685 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3); 686 static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL, 687 3); 688 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 0); 689 static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL, 690 0); 691 static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm, 692 i8k_hwmon_set_pwm, 0); 693 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 694 1); 695 static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL, 696 1); 697 static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm, 698 i8k_hwmon_set_pwm, 1); 699 700 static struct attribute *i8k_attrs[] = { 701 &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */ 702 &sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */ 703 &sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */ 704 &sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */ 705 &sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */ 706 &sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */ 707 &sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */ 708 &sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */ 709 &sensor_dev_attr_fan1_input.dev_attr.attr, /* 8 */ 710 &sensor_dev_attr_fan1_label.dev_attr.attr, /* 9 */ 711 &sensor_dev_attr_pwm1.dev_attr.attr, /* 10 */ 712 &sensor_dev_attr_fan2_input.dev_attr.attr, /* 11 */ 713 &sensor_dev_attr_fan2_label.dev_attr.attr, /* 12 */ 714 &sensor_dev_attr_pwm2.dev_attr.attr, /* 13 */ 715 NULL 716 }; 717 718 static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr, 719 int index) 720 { 721 if (index >= 0 && index <= 1 && 722 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1)) 723 return 0; 724 if (index >= 2 && index <= 3 && 725 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2)) 726 return 0; 727 if (index >= 4 && index <= 5 && 728 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3)) 729 return 0; 730 if (index >= 6 && index <= 7 && 731 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4)) 732 return 0; 733 if (index >= 8 && index <= 10 && 734 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1)) 735 return 0; 736 if (index >= 11 && index <= 13 && 737 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2)) 738 return 0; 739 740 return attr->mode; 741 } 742 743 static const struct attribute_group i8k_group = { 744 .attrs = i8k_attrs, 745 .is_visible = i8k_is_visible, 746 }; 747 __ATTRIBUTE_GROUPS(i8k); 748 749 static int __init i8k_init_hwmon(void) 750 { 751 int err; 752 753 i8k_hwmon_flags = 0; 754 755 /* CPU temperature attributes, if temperature type is OK */ 756 err = i8k_get_temp_type(0); 757 if (err >= 0) 758 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1; 759 /* check for additional temperature sensors */ 760 err = i8k_get_temp_type(1); 761 if (err >= 0) 762 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2; 763 err = i8k_get_temp_type(2); 764 if (err >= 0) 765 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3; 766 err = i8k_get_temp_type(3); 767 if (err >= 0) 768 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4; 769 770 /* First fan attributes, if fan type is OK */ 771 err = i8k_get_fan_type(0); 772 if (err >= 0) 773 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1; 774 775 /* Second fan attributes, if fan type is OK */ 776 err = i8k_get_fan_type(1); 777 if (err >= 0) 778 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2; 779 780 i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm", 781 NULL, i8k_groups); 782 if (IS_ERR(i8k_hwmon_dev)) { 783 err = PTR_ERR(i8k_hwmon_dev); 784 i8k_hwmon_dev = NULL; 785 pr_err("hwmon registration failed (%d)\n", err); 786 return err; 787 } 788 return 0; 789 } 790 791 struct i8k_config_data { 792 uint fan_mult; 793 uint fan_max; 794 }; 795 796 enum i8k_configs { 797 DELL_LATITUDE_D520, 798 DELL_PRECISION_490, 799 DELL_STUDIO, 800 DELL_XPS, 801 }; 802 803 static const struct i8k_config_data i8k_config_data[] = { 804 [DELL_LATITUDE_D520] = { 805 .fan_mult = 1, 806 .fan_max = I8K_FAN_TURBO, 807 }, 808 [DELL_PRECISION_490] = { 809 .fan_mult = 1, 810 .fan_max = I8K_FAN_TURBO, 811 }, 812 [DELL_STUDIO] = { 813 .fan_mult = 1, 814 .fan_max = I8K_FAN_HIGH, 815 }, 816 [DELL_XPS] = { 817 .fan_mult = 1, 818 .fan_max = I8K_FAN_HIGH, 819 }, 820 }; 821 822 static struct dmi_system_id i8k_dmi_table[] __initdata = { 823 { 824 .ident = "Dell Inspiron", 825 .matches = { 826 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"), 827 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"), 828 }, 829 }, 830 { 831 .ident = "Dell Latitude", 832 .matches = { 833 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"), 834 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"), 835 }, 836 }, 837 { 838 .ident = "Dell Inspiron 2", 839 .matches = { 840 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 841 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"), 842 }, 843 }, 844 { 845 .ident = "Dell Latitude D520", 846 .matches = { 847 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 848 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"), 849 }, 850 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520], 851 }, 852 { 853 .ident = "Dell Latitude 2", 854 .matches = { 855 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 856 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"), 857 }, 858 }, 859 { /* UK Inspiron 6400 */ 860 .ident = "Dell Inspiron 3", 861 .matches = { 862 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 863 DMI_MATCH(DMI_PRODUCT_NAME, "MM061"), 864 }, 865 }, 866 { 867 .ident = "Dell Inspiron 3", 868 .matches = { 869 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 870 DMI_MATCH(DMI_PRODUCT_NAME, "MP061"), 871 }, 872 }, 873 { 874 .ident = "Dell Precision 490", 875 .matches = { 876 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 877 DMI_MATCH(DMI_PRODUCT_NAME, 878 "Precision WorkStation 490"), 879 }, 880 .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490], 881 }, 882 { 883 .ident = "Dell Precision", 884 .matches = { 885 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 886 DMI_MATCH(DMI_PRODUCT_NAME, "Precision"), 887 }, 888 }, 889 { 890 .ident = "Dell Vostro", 891 .matches = { 892 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 893 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"), 894 }, 895 }, 896 { 897 .ident = "Dell XPS421", 898 .matches = { 899 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 900 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"), 901 }, 902 }, 903 { 904 .ident = "Dell Studio", 905 .matches = { 906 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 907 DMI_MATCH(DMI_PRODUCT_NAME, "Studio"), 908 }, 909 .driver_data = (void *)&i8k_config_data[DELL_STUDIO], 910 }, 911 { 912 .ident = "Dell XPS 13", 913 .matches = { 914 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 915 DMI_MATCH(DMI_PRODUCT_NAME, "XPS13"), 916 }, 917 .driver_data = (void *)&i8k_config_data[DELL_XPS], 918 }, 919 { 920 .ident = "Dell XPS M140", 921 .matches = { 922 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 923 DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"), 924 }, 925 .driver_data = (void *)&i8k_config_data[DELL_XPS], 926 }, 927 { } 928 }; 929 930 MODULE_DEVICE_TABLE(dmi, i8k_dmi_table); 931 932 static struct dmi_system_id i8k_blacklist_dmi_table[] __initdata = { 933 { 934 /* 935 * CPU fan speed going up and down on Dell Studio XPS 8000 936 * for unknown reasons. 937 */ 938 .ident = "Dell Studio XPS 8000", 939 .matches = { 940 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 941 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000"), 942 }, 943 }, 944 { 945 /* 946 * CPU fan speed going up and down on Dell Studio XPS 8100 947 * for unknown reasons. 948 */ 949 .ident = "Dell Studio XPS 8100", 950 .matches = { 951 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 952 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"), 953 }, 954 }, 955 { } 956 }; 957 958 /* 959 * Probe for the presence of a supported laptop. 960 */ 961 static int __init i8k_probe(void) 962 { 963 const struct dmi_system_id *id; 964 int fan, ret; 965 966 /* 967 * Get DMI information 968 */ 969 if (!dmi_check_system(i8k_dmi_table) || 970 dmi_check_system(i8k_blacklist_dmi_table)) { 971 if (!ignore_dmi && !force) 972 return -ENODEV; 973 974 pr_info("not running on a supported Dell system.\n"); 975 pr_info("vendor=%s, model=%s, version=%s\n", 976 i8k_get_dmi_data(DMI_SYS_VENDOR), 977 i8k_get_dmi_data(DMI_PRODUCT_NAME), 978 i8k_get_dmi_data(DMI_BIOS_VERSION)); 979 } 980 981 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), 982 sizeof(bios_version)); 983 984 /* 985 * Get SMM Dell signature 986 */ 987 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) && 988 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) { 989 pr_err("unable to get SMM Dell signature\n"); 990 if (!force) 991 return -ENODEV; 992 } 993 994 /* 995 * Set fan multiplier and maximal fan speed from dmi config 996 * Values specified in module parameters override values from dmi 997 */ 998 id = dmi_first_match(i8k_dmi_table); 999 if (id && id->driver_data) { 1000 const struct i8k_config_data *conf = id->driver_data; 1001 if (!fan_mult && conf->fan_mult) 1002 fan_mult = conf->fan_mult; 1003 if (!fan_max && conf->fan_max) 1004 fan_max = conf->fan_max; 1005 } 1006 1007 i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */ 1008 i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max); 1009 1010 if (!fan_mult) { 1011 /* 1012 * Autodetect fan multiplier based on nominal rpm 1013 * If fan reports rpm value too high then set multiplier to 1 1014 */ 1015 for (fan = 0; fan < 2; ++fan) { 1016 ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max); 1017 if (ret < 0) 1018 continue; 1019 if (ret > I8K_FAN_MAX_RPM) 1020 i8k_fan_mult = 1; 1021 break; 1022 } 1023 } else { 1024 /* Fan multiplier was specified in module param or in dmi */ 1025 i8k_fan_mult = fan_mult; 1026 } 1027 1028 return 0; 1029 } 1030 1031 static int __init i8k_init(void) 1032 { 1033 int err; 1034 1035 /* Are we running on an supported laptop? */ 1036 if (i8k_probe()) 1037 return -ENODEV; 1038 1039 err = i8k_init_hwmon(); 1040 if (err) 1041 return err; 1042 1043 i8k_init_procfs(); 1044 return 0; 1045 } 1046 1047 static void __exit i8k_exit(void) 1048 { 1049 hwmon_device_unregister(i8k_hwmon_dev); 1050 i8k_exit_procfs(); 1051 } 1052 1053 module_init(i8k_init); 1054 module_exit(i8k_exit); 1055