| 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 | #include <linux/ctype.h> |
| 39 | |
| 40 | #include <linux/i8k.h> |
| 41 | |
| 42 | #define I8K_SMM_FN_STATUS 0x0025 |
| 43 | #define I8K_SMM_POWER_STATUS 0x0069 |
| 44 | #define I8K_SMM_SET_FAN 0x01a3 |
| 45 | #define I8K_SMM_GET_FAN 0x00a3 |
| 46 | #define I8K_SMM_GET_SPEED 0x02a3 |
| 47 | #define I8K_SMM_GET_FAN_TYPE 0x03a3 |
| 48 | #define I8K_SMM_GET_NOM_SPEED 0x04a3 |
| 49 | #define I8K_SMM_GET_TEMP 0x10a3 |
| 50 | #define I8K_SMM_GET_TEMP_TYPE 0x11a3 |
| 51 | #define I8K_SMM_GET_DELL_SIG1 0xfea3 |
| 52 | #define I8K_SMM_GET_DELL_SIG2 0xffa3 |
| 53 | |
| 54 | #define I8K_FAN_MULT 30 |
| 55 | #define I8K_FAN_MAX_RPM 30000 |
| 56 | #define I8K_MAX_TEMP 127 |
| 57 | |
| 58 | #define I8K_FN_NONE 0x00 |
| 59 | #define I8K_FN_UP 0x01 |
| 60 | #define I8K_FN_DOWN 0x02 |
| 61 | #define I8K_FN_MUTE 0x04 |
| 62 | #define I8K_FN_MASK 0x07 |
| 63 | #define I8K_FN_SHIFT 8 |
| 64 | |
| 65 | #define I8K_POWER_AC 0x05 |
| 66 | #define I8K_POWER_BATTERY 0x01 |
| 67 | |
| 68 | static DEFINE_MUTEX(i8k_mutex); |
| 69 | static char bios_version[4]; |
| 70 | static char bios_machineid[16]; |
| 71 | static struct device *i8k_hwmon_dev; |
| 72 | static u32 i8k_hwmon_flags; |
| 73 | static uint i8k_fan_mult = I8K_FAN_MULT; |
| 74 | static uint i8k_pwm_mult; |
| 75 | static uint i8k_fan_max = I8K_FAN_HIGH; |
| 76 | static bool disallow_fan_type_call; |
| 77 | |
| 78 | #define I8K_HWMON_HAVE_TEMP1 (1 << 0) |
| 79 | #define I8K_HWMON_HAVE_TEMP2 (1 << 1) |
| 80 | #define I8K_HWMON_HAVE_TEMP3 (1 << 2) |
| 81 | #define I8K_HWMON_HAVE_TEMP4 (1 << 3) |
| 82 | #define I8K_HWMON_HAVE_FAN1 (1 << 4) |
| 83 | #define I8K_HWMON_HAVE_FAN2 (1 << 5) |
| 84 | #define I8K_HWMON_HAVE_FAN3 (1 << 6) |
| 85 | |
| 86 | MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)"); |
| 87 | MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>"); |
| 88 | MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver"); |
| 89 | MODULE_LICENSE("GPL"); |
| 90 | MODULE_ALIAS("i8k"); |
| 91 | |
| 92 | static bool force; |
| 93 | module_param(force, bool, 0); |
| 94 | MODULE_PARM_DESC(force, "Force loading without checking for supported models"); |
| 95 | |
| 96 | static bool ignore_dmi; |
| 97 | module_param(ignore_dmi, bool, 0); |
| 98 | MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match"); |
| 99 | |
| 100 | #if IS_ENABLED(CONFIG_I8K) |
| 101 | static bool restricted = true; |
| 102 | module_param(restricted, bool, 0); |
| 103 | MODULE_PARM_DESC(restricted, "Restrict fan control and serial number to CAP_SYS_ADMIN (default: 1)"); |
| 104 | |
| 105 | static bool power_status; |
| 106 | module_param(power_status, bool, 0600); |
| 107 | MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k (default: 0)"); |
| 108 | #endif |
| 109 | |
| 110 | static uint fan_mult; |
| 111 | module_param(fan_mult, uint, 0); |
| 112 | MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)"); |
| 113 | |
| 114 | static uint fan_max; |
| 115 | module_param(fan_max, uint, 0); |
| 116 | MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)"); |
| 117 | |
| 118 | struct smm_regs { |
| 119 | unsigned int eax; |
| 120 | unsigned int ebx __packed; |
| 121 | unsigned int ecx __packed; |
| 122 | unsigned int edx __packed; |
| 123 | unsigned int esi __packed; |
| 124 | unsigned int edi __packed; |
| 125 | }; |
| 126 | |
| 127 | static inline const char *i8k_get_dmi_data(int field) |
| 128 | { |
| 129 | const char *dmi_data = dmi_get_system_info(field); |
| 130 | |
| 131 | return dmi_data && *dmi_data ? dmi_data : "?"; |
| 132 | } |
| 133 | |
| 134 | /* |
| 135 | * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard. |
| 136 | */ |
| 137 | static int i8k_smm(struct smm_regs *regs) |
| 138 | { |
| 139 | int rc; |
| 140 | int eax = regs->eax; |
| 141 | cpumask_var_t old_mask; |
| 142 | |
| 143 | #ifdef DEBUG |
| 144 | int ebx = regs->ebx; |
| 145 | unsigned long duration; |
| 146 | ktime_t calltime, delta, rettime; |
| 147 | |
| 148 | calltime = ktime_get(); |
| 149 | #endif |
| 150 | |
| 151 | /* SMM requires CPU 0 */ |
| 152 | if (!alloc_cpumask_var(&old_mask, GFP_KERNEL)) |
| 153 | return -ENOMEM; |
| 154 | cpumask_copy(old_mask, ¤t->cpus_allowed); |
| 155 | rc = set_cpus_allowed_ptr(current, cpumask_of(0)); |
| 156 | if (rc) |
| 157 | goto out; |
| 158 | if (smp_processor_id() != 0) { |
| 159 | rc = -EBUSY; |
| 160 | goto out; |
| 161 | } |
| 162 | |
| 163 | #if defined(CONFIG_X86_64) |
| 164 | asm volatile("pushq %%rax\n\t" |
| 165 | "movl 0(%%rax),%%edx\n\t" |
| 166 | "pushq %%rdx\n\t" |
| 167 | "movl 4(%%rax),%%ebx\n\t" |
| 168 | "movl 8(%%rax),%%ecx\n\t" |
| 169 | "movl 12(%%rax),%%edx\n\t" |
| 170 | "movl 16(%%rax),%%esi\n\t" |
| 171 | "movl 20(%%rax),%%edi\n\t" |
| 172 | "popq %%rax\n\t" |
| 173 | "out %%al,$0xb2\n\t" |
| 174 | "out %%al,$0x84\n\t" |
| 175 | "xchgq %%rax,(%%rsp)\n\t" |
| 176 | "movl %%ebx,4(%%rax)\n\t" |
| 177 | "movl %%ecx,8(%%rax)\n\t" |
| 178 | "movl %%edx,12(%%rax)\n\t" |
| 179 | "movl %%esi,16(%%rax)\n\t" |
| 180 | "movl %%edi,20(%%rax)\n\t" |
| 181 | "popq %%rdx\n\t" |
| 182 | "movl %%edx,0(%%rax)\n\t" |
| 183 | "pushfq\n\t" |
| 184 | "popq %%rax\n\t" |
| 185 | "andl $1,%%eax\n" |
| 186 | : "=a"(rc) |
| 187 | : "a"(regs) |
| 188 | : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); |
| 189 | #else |
| 190 | asm volatile("pushl %%eax\n\t" |
| 191 | "movl 0(%%eax),%%edx\n\t" |
| 192 | "push %%edx\n\t" |
| 193 | "movl 4(%%eax),%%ebx\n\t" |
| 194 | "movl 8(%%eax),%%ecx\n\t" |
| 195 | "movl 12(%%eax),%%edx\n\t" |
| 196 | "movl 16(%%eax),%%esi\n\t" |
| 197 | "movl 20(%%eax),%%edi\n\t" |
| 198 | "popl %%eax\n\t" |
| 199 | "out %%al,$0xb2\n\t" |
| 200 | "out %%al,$0x84\n\t" |
| 201 | "xchgl %%eax,(%%esp)\n\t" |
| 202 | "movl %%ebx,4(%%eax)\n\t" |
| 203 | "movl %%ecx,8(%%eax)\n\t" |
| 204 | "movl %%edx,12(%%eax)\n\t" |
| 205 | "movl %%esi,16(%%eax)\n\t" |
| 206 | "movl %%edi,20(%%eax)\n\t" |
| 207 | "popl %%edx\n\t" |
| 208 | "movl %%edx,0(%%eax)\n\t" |
| 209 | "lahf\n\t" |
| 210 | "shrl $8,%%eax\n\t" |
| 211 | "andl $1,%%eax\n" |
| 212 | : "=a"(rc) |
| 213 | : "a"(regs) |
| 214 | : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); |
| 215 | #endif |
| 216 | if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax) |
| 217 | rc = -EINVAL; |
| 218 | |
| 219 | out: |
| 220 | set_cpus_allowed_ptr(current, old_mask); |
| 221 | free_cpumask_var(old_mask); |
| 222 | |
| 223 | #ifdef DEBUG |
| 224 | rettime = ktime_get(); |
| 225 | delta = ktime_sub(rettime, calltime); |
| 226 | duration = ktime_to_ns(delta) >> 10; |
| 227 | pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lu usecs)\n", eax, ebx, |
| 228 | (rc ? 0xffff : regs->eax & 0xffff), duration); |
| 229 | #endif |
| 230 | |
| 231 | return rc; |
| 232 | } |
| 233 | |
| 234 | /* |
| 235 | * Read the fan status. |
| 236 | */ |
| 237 | static int i8k_get_fan_status(int fan) |
| 238 | { |
| 239 | struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, }; |
| 240 | |
| 241 | regs.ebx = fan & 0xff; |
| 242 | return i8k_smm(®s) ? : regs.eax & 0xff; |
| 243 | } |
| 244 | |
| 245 | /* |
| 246 | * Read the fan speed in RPM. |
| 247 | */ |
| 248 | static int i8k_get_fan_speed(int fan) |
| 249 | { |
| 250 | struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, }; |
| 251 | |
| 252 | regs.ebx = fan & 0xff; |
| 253 | return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult; |
| 254 | } |
| 255 | |
| 256 | /* |
| 257 | * Read the fan type. |
| 258 | */ |
| 259 | static int _i8k_get_fan_type(int fan) |
| 260 | { |
| 261 | struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, }; |
| 262 | |
| 263 | if (disallow_fan_type_call) |
| 264 | return -EINVAL; |
| 265 | |
| 266 | regs.ebx = fan & 0xff; |
| 267 | return i8k_smm(®s) ? : regs.eax & 0xff; |
| 268 | } |
| 269 | |
| 270 | static int i8k_get_fan_type(int fan) |
| 271 | { |
| 272 | /* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */ |
| 273 | static int types[3] = { INT_MIN, INT_MIN, INT_MIN }; |
| 274 | |
| 275 | if (types[fan] == INT_MIN) |
| 276 | types[fan] = _i8k_get_fan_type(fan); |
| 277 | |
| 278 | return types[fan]; |
| 279 | } |
| 280 | |
| 281 | /* |
| 282 | * Read the fan nominal rpm for specific fan speed. |
| 283 | */ |
| 284 | static int i8k_get_fan_nominal_speed(int fan, int speed) |
| 285 | { |
| 286 | struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, }; |
| 287 | |
| 288 | regs.ebx = (fan & 0xff) | (speed << 8); |
| 289 | return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult; |
| 290 | } |
| 291 | |
| 292 | /* |
| 293 | * Set the fan speed (off, low, high). Returns the new fan status. |
| 294 | */ |
| 295 | static int i8k_set_fan(int fan, int speed) |
| 296 | { |
| 297 | struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, }; |
| 298 | |
| 299 | speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed); |
| 300 | regs.ebx = (fan & 0xff) | (speed << 8); |
| 301 | |
| 302 | return i8k_smm(®s) ? : i8k_get_fan_status(fan); |
| 303 | } |
| 304 | |
| 305 | static int i8k_get_temp_type(int sensor) |
| 306 | { |
| 307 | struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, }; |
| 308 | |
| 309 | regs.ebx = sensor & 0xff; |
| 310 | return i8k_smm(®s) ? : regs.eax & 0xff; |
| 311 | } |
| 312 | |
| 313 | /* |
| 314 | * Read the cpu temperature. |
| 315 | */ |
| 316 | static int _i8k_get_temp(int sensor) |
| 317 | { |
| 318 | struct smm_regs regs = { |
| 319 | .eax = I8K_SMM_GET_TEMP, |
| 320 | .ebx = sensor & 0xff, |
| 321 | }; |
| 322 | |
| 323 | return i8k_smm(®s) ? : regs.eax & 0xff; |
| 324 | } |
| 325 | |
| 326 | static int i8k_get_temp(int sensor) |
| 327 | { |
| 328 | int temp = _i8k_get_temp(sensor); |
| 329 | |
| 330 | /* |
| 331 | * Sometimes the temperature sensor returns 0x99, which is out of range. |
| 332 | * In this case we retry (once) before returning an error. |
| 333 | # 1003655137 00000058 00005a4b |
| 334 | # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees |
| 335 | # 1003655139 00000054 00005c52 |
| 336 | */ |
| 337 | if (temp == 0x99) { |
| 338 | msleep(100); |
| 339 | temp = _i8k_get_temp(sensor); |
| 340 | } |
| 341 | /* |
| 342 | * Return -ENODATA for all invalid temperatures. |
| 343 | * |
| 344 | * Known instances are the 0x99 value as seen above as well as |
| 345 | * 0xc1 (193), which may be returned when trying to read the GPU |
| 346 | * temperature if the system supports a GPU and it is currently |
| 347 | * turned off. |
| 348 | */ |
| 349 | if (temp > I8K_MAX_TEMP) |
| 350 | return -ENODATA; |
| 351 | |
| 352 | return temp; |
| 353 | } |
| 354 | |
| 355 | static int i8k_get_dell_signature(int req_fn) |
| 356 | { |
| 357 | struct smm_regs regs = { .eax = req_fn, }; |
| 358 | int rc; |
| 359 | |
| 360 | rc = i8k_smm(®s); |
| 361 | if (rc < 0) |
| 362 | return rc; |
| 363 | |
| 364 | return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1; |
| 365 | } |
| 366 | |
| 367 | #if IS_ENABLED(CONFIG_I8K) |
| 368 | |
| 369 | /* |
| 370 | * Read the Fn key status. |
| 371 | */ |
| 372 | static int i8k_get_fn_status(void) |
| 373 | { |
| 374 | struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, }; |
| 375 | int rc; |
| 376 | |
| 377 | rc = i8k_smm(®s); |
| 378 | if (rc < 0) |
| 379 | return rc; |
| 380 | |
| 381 | switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) { |
| 382 | case I8K_FN_UP: |
| 383 | return I8K_VOL_UP; |
| 384 | case I8K_FN_DOWN: |
| 385 | return I8K_VOL_DOWN; |
| 386 | case I8K_FN_MUTE: |
| 387 | return I8K_VOL_MUTE; |
| 388 | default: |
| 389 | return 0; |
| 390 | } |
| 391 | } |
| 392 | |
| 393 | /* |
| 394 | * Read the power status. |
| 395 | */ |
| 396 | static int i8k_get_power_status(void) |
| 397 | { |
| 398 | struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, }; |
| 399 | int rc; |
| 400 | |
| 401 | rc = i8k_smm(®s); |
| 402 | if (rc < 0) |
| 403 | return rc; |
| 404 | |
| 405 | return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY; |
| 406 | } |
| 407 | |
| 408 | /* |
| 409 | * Procfs interface |
| 410 | */ |
| 411 | |
| 412 | static int |
| 413 | i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg) |
| 414 | { |
| 415 | int val = 0; |
| 416 | int speed; |
| 417 | unsigned char buff[16]; |
| 418 | int __user *argp = (int __user *)arg; |
| 419 | |
| 420 | if (!argp) |
| 421 | return -EINVAL; |
| 422 | |
| 423 | switch (cmd) { |
| 424 | case I8K_BIOS_VERSION: |
| 425 | if (!isdigit(bios_version[0]) || !isdigit(bios_version[1]) || |
| 426 | !isdigit(bios_version[2])) |
| 427 | return -EINVAL; |
| 428 | |
| 429 | val = (bios_version[0] << 16) | |
| 430 | (bios_version[1] << 8) | bios_version[2]; |
| 431 | break; |
| 432 | |
| 433 | case I8K_MACHINE_ID: |
| 434 | if (restricted && !capable(CAP_SYS_ADMIN)) |
| 435 | return -EPERM; |
| 436 | |
| 437 | memset(buff, 0, sizeof(buff)); |
| 438 | strlcpy(buff, bios_machineid, sizeof(buff)); |
| 439 | break; |
| 440 | |
| 441 | case I8K_FN_STATUS: |
| 442 | val = i8k_get_fn_status(); |
| 443 | break; |
| 444 | |
| 445 | case I8K_POWER_STATUS: |
| 446 | val = i8k_get_power_status(); |
| 447 | break; |
| 448 | |
| 449 | case I8K_GET_TEMP: |
| 450 | val = i8k_get_temp(0); |
| 451 | break; |
| 452 | |
| 453 | case I8K_GET_SPEED: |
| 454 | if (copy_from_user(&val, argp, sizeof(int))) |
| 455 | return -EFAULT; |
| 456 | |
| 457 | val = i8k_get_fan_speed(val); |
| 458 | break; |
| 459 | |
| 460 | case I8K_GET_FAN: |
| 461 | if (copy_from_user(&val, argp, sizeof(int))) |
| 462 | return -EFAULT; |
| 463 | |
| 464 | val = i8k_get_fan_status(val); |
| 465 | break; |
| 466 | |
| 467 | case I8K_SET_FAN: |
| 468 | if (restricted && !capable(CAP_SYS_ADMIN)) |
| 469 | return -EPERM; |
| 470 | |
| 471 | if (copy_from_user(&val, argp, sizeof(int))) |
| 472 | return -EFAULT; |
| 473 | |
| 474 | if (copy_from_user(&speed, argp + 1, sizeof(int))) |
| 475 | return -EFAULT; |
| 476 | |
| 477 | val = i8k_set_fan(val, speed); |
| 478 | break; |
| 479 | |
| 480 | default: |
| 481 | return -EINVAL; |
| 482 | } |
| 483 | |
| 484 | if (val < 0) |
| 485 | return val; |
| 486 | |
| 487 | switch (cmd) { |
| 488 | case I8K_BIOS_VERSION: |
| 489 | if (copy_to_user(argp, &val, 4)) |
| 490 | return -EFAULT; |
| 491 | |
| 492 | break; |
| 493 | case I8K_MACHINE_ID: |
| 494 | if (copy_to_user(argp, buff, 16)) |
| 495 | return -EFAULT; |
| 496 | |
| 497 | break; |
| 498 | default: |
| 499 | if (copy_to_user(argp, &val, sizeof(int))) |
| 500 | return -EFAULT; |
| 501 | |
| 502 | break; |
| 503 | } |
| 504 | |
| 505 | return 0; |
| 506 | } |
| 507 | |
| 508 | static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) |
| 509 | { |
| 510 | long ret; |
| 511 | |
| 512 | mutex_lock(&i8k_mutex); |
| 513 | ret = i8k_ioctl_unlocked(fp, cmd, arg); |
| 514 | mutex_unlock(&i8k_mutex); |
| 515 | |
| 516 | return ret; |
| 517 | } |
| 518 | |
| 519 | /* |
| 520 | * Print the information for /proc/i8k. |
| 521 | */ |
| 522 | static int i8k_proc_show(struct seq_file *seq, void *offset) |
| 523 | { |
| 524 | int fn_key, cpu_temp, ac_power; |
| 525 | int left_fan, right_fan, left_speed, right_speed; |
| 526 | |
| 527 | cpu_temp = i8k_get_temp(0); /* 11100 µs */ |
| 528 | left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */ |
| 529 | right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */ |
| 530 | left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */ |
| 531 | right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */ |
| 532 | fn_key = i8k_get_fn_status(); /* 750 µs */ |
| 533 | if (power_status) |
| 534 | ac_power = i8k_get_power_status(); /* 14700 µs */ |
| 535 | else |
| 536 | ac_power = -1; |
| 537 | |
| 538 | /* |
| 539 | * Info: |
| 540 | * |
| 541 | * 1) Format version (this will change if format changes) |
| 542 | * 2) BIOS version |
| 543 | * 3) BIOS machine ID |
| 544 | * 4) Cpu temperature |
| 545 | * 5) Left fan status |
| 546 | * 6) Right fan status |
| 547 | * 7) Left fan speed |
| 548 | * 8) Right fan speed |
| 549 | * 9) AC power |
| 550 | * 10) Fn Key status |
| 551 | */ |
| 552 | seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n", |
| 553 | I8K_PROC_FMT, |
| 554 | bios_version, |
| 555 | (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : bios_machineid, |
| 556 | cpu_temp, |
| 557 | left_fan, right_fan, left_speed, right_speed, |
| 558 | ac_power, fn_key); |
| 559 | |
| 560 | return 0; |
| 561 | } |
| 562 | |
| 563 | static int i8k_open_fs(struct inode *inode, struct file *file) |
| 564 | { |
| 565 | return single_open(file, i8k_proc_show, NULL); |
| 566 | } |
| 567 | |
| 568 | static const struct file_operations i8k_fops = { |
| 569 | .owner = THIS_MODULE, |
| 570 | .open = i8k_open_fs, |
| 571 | .read = seq_read, |
| 572 | .llseek = seq_lseek, |
| 573 | .release = single_release, |
| 574 | .unlocked_ioctl = i8k_ioctl, |
| 575 | }; |
| 576 | |
| 577 | static void __init i8k_init_procfs(void) |
| 578 | { |
| 579 | /* Register the proc entry */ |
| 580 | proc_create("i8k", 0, NULL, &i8k_fops); |
| 581 | } |
| 582 | |
| 583 | static void __exit i8k_exit_procfs(void) |
| 584 | { |
| 585 | remove_proc_entry("i8k", NULL); |
| 586 | } |
| 587 | |
| 588 | #else |
| 589 | |
| 590 | static inline void __init i8k_init_procfs(void) |
| 591 | { |
| 592 | } |
| 593 | |
| 594 | static inline void __exit i8k_exit_procfs(void) |
| 595 | { |
| 596 | } |
| 597 | |
| 598 | #endif |
| 599 | |
| 600 | /* |
| 601 | * Hwmon interface |
| 602 | */ |
| 603 | |
| 604 | static ssize_t i8k_hwmon_show_temp_label(struct device *dev, |
| 605 | struct device_attribute *devattr, |
| 606 | char *buf) |
| 607 | { |
| 608 | static const char * const labels[] = { |
| 609 | "CPU", |
| 610 | "GPU", |
| 611 | "SODIMM", |
| 612 | "Other", |
| 613 | "Ambient", |
| 614 | "Other", |
| 615 | }; |
| 616 | int index = to_sensor_dev_attr(devattr)->index; |
| 617 | int type; |
| 618 | |
| 619 | type = i8k_get_temp_type(index); |
| 620 | if (type < 0) |
| 621 | return type; |
| 622 | if (type >= ARRAY_SIZE(labels)) |
| 623 | type = ARRAY_SIZE(labels) - 1; |
| 624 | return sprintf(buf, "%s\n", labels[type]); |
| 625 | } |
| 626 | |
| 627 | static ssize_t i8k_hwmon_show_temp(struct device *dev, |
| 628 | struct device_attribute *devattr, |
| 629 | char *buf) |
| 630 | { |
| 631 | int index = to_sensor_dev_attr(devattr)->index; |
| 632 | int temp; |
| 633 | |
| 634 | temp = i8k_get_temp(index); |
| 635 | if (temp < 0) |
| 636 | return temp; |
| 637 | return sprintf(buf, "%d\n", temp * 1000); |
| 638 | } |
| 639 | |
| 640 | static ssize_t i8k_hwmon_show_fan_label(struct device *dev, |
| 641 | struct device_attribute *devattr, |
| 642 | char *buf) |
| 643 | { |
| 644 | static const char * const labels[] = { |
| 645 | "Processor Fan", |
| 646 | "Motherboard Fan", |
| 647 | "Video Fan", |
| 648 | "Power Supply Fan", |
| 649 | "Chipset Fan", |
| 650 | "Other Fan", |
| 651 | }; |
| 652 | int index = to_sensor_dev_attr(devattr)->index; |
| 653 | bool dock = false; |
| 654 | int type; |
| 655 | |
| 656 | type = i8k_get_fan_type(index); |
| 657 | if (type < 0) |
| 658 | return type; |
| 659 | |
| 660 | if (type & 0x10) { |
| 661 | dock = true; |
| 662 | type &= 0x0F; |
| 663 | } |
| 664 | |
| 665 | if (type >= ARRAY_SIZE(labels)) |
| 666 | type = (ARRAY_SIZE(labels) - 1); |
| 667 | |
| 668 | return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]); |
| 669 | } |
| 670 | |
| 671 | static ssize_t i8k_hwmon_show_fan(struct device *dev, |
| 672 | struct device_attribute *devattr, |
| 673 | char *buf) |
| 674 | { |
| 675 | int index = to_sensor_dev_attr(devattr)->index; |
| 676 | int fan_speed; |
| 677 | |
| 678 | fan_speed = i8k_get_fan_speed(index); |
| 679 | if (fan_speed < 0) |
| 680 | return fan_speed; |
| 681 | return sprintf(buf, "%d\n", fan_speed); |
| 682 | } |
| 683 | |
| 684 | static ssize_t i8k_hwmon_show_pwm(struct device *dev, |
| 685 | struct device_attribute *devattr, |
| 686 | char *buf) |
| 687 | { |
| 688 | int index = to_sensor_dev_attr(devattr)->index; |
| 689 | int status; |
| 690 | |
| 691 | status = i8k_get_fan_status(index); |
| 692 | if (status < 0) |
| 693 | return -EIO; |
| 694 | return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255)); |
| 695 | } |
| 696 | |
| 697 | static ssize_t i8k_hwmon_set_pwm(struct device *dev, |
| 698 | struct device_attribute *attr, |
| 699 | const char *buf, size_t count) |
| 700 | { |
| 701 | int index = to_sensor_dev_attr(attr)->index; |
| 702 | unsigned long val; |
| 703 | int err; |
| 704 | |
| 705 | err = kstrtoul(buf, 10, &val); |
| 706 | if (err) |
| 707 | return err; |
| 708 | val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max); |
| 709 | |
| 710 | mutex_lock(&i8k_mutex); |
| 711 | err = i8k_set_fan(index, val); |
| 712 | mutex_unlock(&i8k_mutex); |
| 713 | |
| 714 | return err < 0 ? -EIO : count; |
| 715 | } |
| 716 | |
| 717 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0); |
| 718 | static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL, |
| 719 | 0); |
| 720 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1); |
| 721 | static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL, |
| 722 | 1); |
| 723 | static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2); |
| 724 | static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL, |
| 725 | 2); |
| 726 | static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3); |
| 727 | static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL, |
| 728 | 3); |
| 729 | static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 0); |
| 730 | static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL, |
| 731 | 0); |
| 732 | static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm, |
| 733 | i8k_hwmon_set_pwm, 0); |
| 734 | static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL, |
| 735 | 1); |
| 736 | static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL, |
| 737 | 1); |
| 738 | static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm, |
| 739 | i8k_hwmon_set_pwm, 1); |
| 740 | static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, i8k_hwmon_show_fan, NULL, |
| 741 | 2); |
| 742 | static SENSOR_DEVICE_ATTR(fan3_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL, |
| 743 | 2); |
| 744 | static SENSOR_DEVICE_ATTR(pwm3, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm, |
| 745 | i8k_hwmon_set_pwm, 2); |
| 746 | |
| 747 | static struct attribute *i8k_attrs[] = { |
| 748 | &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */ |
| 749 | &sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */ |
| 750 | &sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */ |
| 751 | &sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */ |
| 752 | &sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */ |
| 753 | &sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */ |
| 754 | &sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */ |
| 755 | &sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */ |
| 756 | &sensor_dev_attr_fan1_input.dev_attr.attr, /* 8 */ |
| 757 | &sensor_dev_attr_fan1_label.dev_attr.attr, /* 9 */ |
| 758 | &sensor_dev_attr_pwm1.dev_attr.attr, /* 10 */ |
| 759 | &sensor_dev_attr_fan2_input.dev_attr.attr, /* 11 */ |
| 760 | &sensor_dev_attr_fan2_label.dev_attr.attr, /* 12 */ |
| 761 | &sensor_dev_attr_pwm2.dev_attr.attr, /* 13 */ |
| 762 | &sensor_dev_attr_fan3_input.dev_attr.attr, /* 14 */ |
| 763 | &sensor_dev_attr_fan3_label.dev_attr.attr, /* 15 */ |
| 764 | &sensor_dev_attr_pwm3.dev_attr.attr, /* 16 */ |
| 765 | NULL |
| 766 | }; |
| 767 | |
| 768 | static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr, |
| 769 | int index) |
| 770 | { |
| 771 | if (disallow_fan_type_call && |
| 772 | (index == 9 || index == 12 || index == 15)) |
| 773 | return 0; |
| 774 | if (index >= 0 && index <= 1 && |
| 775 | !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1)) |
| 776 | return 0; |
| 777 | if (index >= 2 && index <= 3 && |
| 778 | !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2)) |
| 779 | return 0; |
| 780 | if (index >= 4 && index <= 5 && |
| 781 | !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3)) |
| 782 | return 0; |
| 783 | if (index >= 6 && index <= 7 && |
| 784 | !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4)) |
| 785 | return 0; |
| 786 | if (index >= 8 && index <= 10 && |
| 787 | !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1)) |
| 788 | return 0; |
| 789 | if (index >= 11 && index <= 13 && |
| 790 | !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2)) |
| 791 | return 0; |
| 792 | if (index >= 14 && index <= 16 && |
| 793 | !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN3)) |
| 794 | return 0; |
| 795 | |
| 796 | return attr->mode; |
| 797 | } |
| 798 | |
| 799 | static const struct attribute_group i8k_group = { |
| 800 | .attrs = i8k_attrs, |
| 801 | .is_visible = i8k_is_visible, |
| 802 | }; |
| 803 | __ATTRIBUTE_GROUPS(i8k); |
| 804 | |
| 805 | static int __init i8k_init_hwmon(void) |
| 806 | { |
| 807 | int err; |
| 808 | |
| 809 | i8k_hwmon_flags = 0; |
| 810 | |
| 811 | /* CPU temperature attributes, if temperature type is OK */ |
| 812 | err = i8k_get_temp_type(0); |
| 813 | if (err >= 0) |
| 814 | i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1; |
| 815 | /* check for additional temperature sensors */ |
| 816 | err = i8k_get_temp_type(1); |
| 817 | if (err >= 0) |
| 818 | i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2; |
| 819 | err = i8k_get_temp_type(2); |
| 820 | if (err >= 0) |
| 821 | i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3; |
| 822 | err = i8k_get_temp_type(3); |
| 823 | if (err >= 0) |
| 824 | i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4; |
| 825 | |
| 826 | /* First fan attributes, if fan status or type is OK */ |
| 827 | err = i8k_get_fan_status(0); |
| 828 | if (err < 0) |
| 829 | err = i8k_get_fan_type(0); |
| 830 | if (err >= 0) |
| 831 | i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1; |
| 832 | |
| 833 | /* Second fan attributes, if fan status or type is OK */ |
| 834 | err = i8k_get_fan_status(1); |
| 835 | if (err < 0) |
| 836 | err = i8k_get_fan_type(1); |
| 837 | if (err >= 0) |
| 838 | i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2; |
| 839 | |
| 840 | /* Third fan attributes, if fan status or type is OK */ |
| 841 | err = i8k_get_fan_status(2); |
| 842 | if (err < 0) |
| 843 | err = i8k_get_fan_type(2); |
| 844 | if (err >= 0) |
| 845 | i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN3; |
| 846 | |
| 847 | i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm", |
| 848 | NULL, i8k_groups); |
| 849 | if (IS_ERR(i8k_hwmon_dev)) { |
| 850 | err = PTR_ERR(i8k_hwmon_dev); |
| 851 | i8k_hwmon_dev = NULL; |
| 852 | pr_err("hwmon registration failed (%d)\n", err); |
| 853 | return err; |
| 854 | } |
| 855 | return 0; |
| 856 | } |
| 857 | |
| 858 | struct i8k_config_data { |
| 859 | uint fan_mult; |
| 860 | uint fan_max; |
| 861 | }; |
| 862 | |
| 863 | enum i8k_configs { |
| 864 | DELL_LATITUDE_D520, |
| 865 | DELL_PRECISION_490, |
| 866 | DELL_STUDIO, |
| 867 | DELL_XPS, |
| 868 | }; |
| 869 | |
| 870 | static const struct i8k_config_data i8k_config_data[] = { |
| 871 | [DELL_LATITUDE_D520] = { |
| 872 | .fan_mult = 1, |
| 873 | .fan_max = I8K_FAN_TURBO, |
| 874 | }, |
| 875 | [DELL_PRECISION_490] = { |
| 876 | .fan_mult = 1, |
| 877 | .fan_max = I8K_FAN_TURBO, |
| 878 | }, |
| 879 | [DELL_STUDIO] = { |
| 880 | .fan_mult = 1, |
| 881 | .fan_max = I8K_FAN_HIGH, |
| 882 | }, |
| 883 | [DELL_XPS] = { |
| 884 | .fan_mult = 1, |
| 885 | .fan_max = I8K_FAN_HIGH, |
| 886 | }, |
| 887 | }; |
| 888 | |
| 889 | static struct dmi_system_id i8k_dmi_table[] __initdata = { |
| 890 | { |
| 891 | .ident = "Dell Inspiron", |
| 892 | .matches = { |
| 893 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"), |
| 894 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"), |
| 895 | }, |
| 896 | }, |
| 897 | { |
| 898 | .ident = "Dell Latitude", |
| 899 | .matches = { |
| 900 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"), |
| 901 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"), |
| 902 | }, |
| 903 | }, |
| 904 | { |
| 905 | .ident = "Dell Inspiron 2", |
| 906 | .matches = { |
| 907 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| 908 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"), |
| 909 | }, |
| 910 | }, |
| 911 | { |
| 912 | .ident = "Dell Latitude D520", |
| 913 | .matches = { |
| 914 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| 915 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"), |
| 916 | }, |
| 917 | .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520], |
| 918 | }, |
| 919 | { |
| 920 | .ident = "Dell Latitude 2", |
| 921 | .matches = { |
| 922 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| 923 | DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"), |
| 924 | }, |
| 925 | }, |
| 926 | { /* UK Inspiron 6400 */ |
| 927 | .ident = "Dell Inspiron 3", |
| 928 | .matches = { |
| 929 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| 930 | DMI_MATCH(DMI_PRODUCT_NAME, "MM061"), |
| 931 | }, |
| 932 | }, |
| 933 | { |
| 934 | .ident = "Dell Inspiron 3", |
| 935 | .matches = { |
| 936 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| 937 | DMI_MATCH(DMI_PRODUCT_NAME, "MP061"), |
| 938 | }, |
| 939 | }, |
| 940 | { |
| 941 | .ident = "Dell Precision 490", |
| 942 | .matches = { |
| 943 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| 944 | DMI_MATCH(DMI_PRODUCT_NAME, |
| 945 | "Precision WorkStation 490"), |
| 946 | }, |
| 947 | .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490], |
| 948 | }, |
| 949 | { |
| 950 | .ident = "Dell Precision", |
| 951 | .matches = { |
| 952 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| 953 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision"), |
| 954 | }, |
| 955 | }, |
| 956 | { |
| 957 | .ident = "Dell Vostro", |
| 958 | .matches = { |
| 959 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| 960 | DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"), |
| 961 | }, |
| 962 | }, |
| 963 | { |
| 964 | .ident = "Dell XPS421", |
| 965 | .matches = { |
| 966 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| 967 | DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"), |
| 968 | }, |
| 969 | }, |
| 970 | { |
| 971 | .ident = "Dell Studio", |
| 972 | .matches = { |
| 973 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| 974 | DMI_MATCH(DMI_PRODUCT_NAME, "Studio"), |
| 975 | }, |
| 976 | .driver_data = (void *)&i8k_config_data[DELL_STUDIO], |
| 977 | }, |
| 978 | { |
| 979 | .ident = "Dell XPS 13", |
| 980 | .matches = { |
| 981 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| 982 | DMI_MATCH(DMI_PRODUCT_NAME, "XPS13"), |
| 983 | }, |
| 984 | .driver_data = (void *)&i8k_config_data[DELL_XPS], |
| 985 | }, |
| 986 | { |
| 987 | .ident = "Dell XPS M140", |
| 988 | .matches = { |
| 989 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| 990 | DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"), |
| 991 | }, |
| 992 | .driver_data = (void *)&i8k_config_data[DELL_XPS], |
| 993 | }, |
| 994 | { } |
| 995 | }; |
| 996 | |
| 997 | MODULE_DEVICE_TABLE(dmi, i8k_dmi_table); |
| 998 | |
| 999 | /* |
| 1000 | * On some machines once I8K_SMM_GET_FAN_TYPE is issued then CPU fan speed |
| 1001 | * randomly going up and down due to bug in Dell SMM or BIOS. Here is blacklist |
| 1002 | * of affected Dell machines for which we disallow I8K_SMM_GET_FAN_TYPE call. |
| 1003 | * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121 |
| 1004 | */ |
| 1005 | static struct dmi_system_id i8k_blacklist_fan_type_dmi_table[] __initdata = { |
| 1006 | { |
| 1007 | .ident = "Dell Studio XPS 8000", |
| 1008 | .matches = { |
| 1009 | DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| 1010 | DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000"), |
| 1011 | }, |
| 1012 | }, |
| 1013 | { |
| 1014 | .ident = "Dell Studio XPS 8100", |
| 1015 | .matches = { |
| 1016 | DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| 1017 | DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"), |
| 1018 | }, |
| 1019 | }, |
| 1020 | { |
| 1021 | .ident = "Dell Inspiron 580", |
| 1022 | .matches = { |
| 1023 | DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| 1024 | DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 580 "), |
| 1025 | }, |
| 1026 | }, |
| 1027 | { } |
| 1028 | }; |
| 1029 | |
| 1030 | /* |
| 1031 | * Probe for the presence of a supported laptop. |
| 1032 | */ |
| 1033 | static int __init i8k_probe(void) |
| 1034 | { |
| 1035 | const struct dmi_system_id *id; |
| 1036 | int fan, ret; |
| 1037 | |
| 1038 | /* |
| 1039 | * Get DMI information |
| 1040 | */ |
| 1041 | if (!dmi_check_system(i8k_dmi_table)) { |
| 1042 | if (!ignore_dmi && !force) |
| 1043 | return -ENODEV; |
| 1044 | |
| 1045 | pr_info("not running on a supported Dell system.\n"); |
| 1046 | pr_info("vendor=%s, model=%s, version=%s\n", |
| 1047 | i8k_get_dmi_data(DMI_SYS_VENDOR), |
| 1048 | i8k_get_dmi_data(DMI_PRODUCT_NAME), |
| 1049 | i8k_get_dmi_data(DMI_BIOS_VERSION)); |
| 1050 | } |
| 1051 | |
| 1052 | if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) |
| 1053 | disallow_fan_type_call = true; |
| 1054 | |
| 1055 | strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION), |
| 1056 | sizeof(bios_version)); |
| 1057 | strlcpy(bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL), |
| 1058 | sizeof(bios_machineid)); |
| 1059 | |
| 1060 | /* |
| 1061 | * Get SMM Dell signature |
| 1062 | */ |
| 1063 | if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) && |
| 1064 | i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) { |
| 1065 | pr_err("unable to get SMM Dell signature\n"); |
| 1066 | if (!force) |
| 1067 | return -ENODEV; |
| 1068 | } |
| 1069 | |
| 1070 | /* |
| 1071 | * Set fan multiplier and maximal fan speed from dmi config |
| 1072 | * Values specified in module parameters override values from dmi |
| 1073 | */ |
| 1074 | id = dmi_first_match(i8k_dmi_table); |
| 1075 | if (id && id->driver_data) { |
| 1076 | const struct i8k_config_data *conf = id->driver_data; |
| 1077 | if (!fan_mult && conf->fan_mult) |
| 1078 | fan_mult = conf->fan_mult; |
| 1079 | if (!fan_max && conf->fan_max) |
| 1080 | fan_max = conf->fan_max; |
| 1081 | } |
| 1082 | |
| 1083 | i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */ |
| 1084 | i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max); |
| 1085 | |
| 1086 | if (!fan_mult) { |
| 1087 | /* |
| 1088 | * Autodetect fan multiplier based on nominal rpm |
| 1089 | * If fan reports rpm value too high then set multiplier to 1 |
| 1090 | */ |
| 1091 | for (fan = 0; fan < 2; ++fan) { |
| 1092 | ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max); |
| 1093 | if (ret < 0) |
| 1094 | continue; |
| 1095 | if (ret > I8K_FAN_MAX_RPM) |
| 1096 | i8k_fan_mult = 1; |
| 1097 | break; |
| 1098 | } |
| 1099 | } else { |
| 1100 | /* Fan multiplier was specified in module param or in dmi */ |
| 1101 | i8k_fan_mult = fan_mult; |
| 1102 | } |
| 1103 | |
| 1104 | return 0; |
| 1105 | } |
| 1106 | |
| 1107 | static int __init i8k_init(void) |
| 1108 | { |
| 1109 | int err; |
| 1110 | |
| 1111 | /* Are we running on an supported laptop? */ |
| 1112 | if (i8k_probe()) |
| 1113 | return -ENODEV; |
| 1114 | |
| 1115 | err = i8k_init_hwmon(); |
| 1116 | if (err) |
| 1117 | return err; |
| 1118 | |
| 1119 | i8k_init_procfs(); |
| 1120 | return 0; |
| 1121 | } |
| 1122 | |
| 1123 | static void __exit i8k_exit(void) |
| 1124 | { |
| 1125 | hwmon_device_unregister(i8k_hwmon_dev); |
| 1126 | i8k_exit_procfs(); |
| 1127 | } |
| 1128 | |
| 1129 | module_init(i8k_init); |
| 1130 | module_exit(i8k_exit); |