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Merge tag 'socfpga_nand_fix_v4.17' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-block.git] / drivers / hwmon / dell-smm-hwmon.c
CommitLineData
1da177e4 1/*
a5afba16 2 * dell-smm-hwmon.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
1da177e4
LT		 3 *
4 * Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org>
5 *
949a9d70 6 * Hwmon integration:
7c81c60f 7 * Copyright (C) 2011 Jean Delvare <jdelvare@suse.de>
564132d9 8 * Copyright (C) 2013, 2014 Guenter Roeck <linux@roeck-us.net>
a5afba16 9 * Copyright (C) 2014, 2015 Pali Rohár <pali.rohar@gmail.com>
949a9d70 10 *
1da177e4
LT		 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
60e71aaf
GR		 22#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
27046a3f 24#include <linux/cpu.h>
564132d9 25#include <linux/delay.h>
1da177e4
LT		 26#include <linux/module.h>
27#include <linux/types.h>
28#include <linux/init.h>
29#include <linux/proc_fs.h>
352f8f8b 30#include <linux/seq_file.h>
e70c9d5e 31#include <linux/dmi.h>
7e80d0d0 32#include <linux/capability.h>
613655fa 33#include <linux/mutex.h>
949a9d70
JD		 34#include <linux/hwmon.h>
35#include <linux/hwmon-sysfs.h>
12186f51
GR		 36#include <linux/uaccess.h>
37#include <linux/io.h>
f36fdb9f 38#include <linux/sched.h>
053ea640 39#include <linux/ctype.h>
27046a3f 40#include <linux/smp.h>
1da177e4
LT		 41
42#include <linux/i8k.h>
43
1da177e4
LT		 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
f989e554 49#define I8K_SMM_GET_FAN_TYPE 0x03a3
8f21d8e9 50#define I8K_SMM_GET_NOM_SPEED 0x04a3
1da177e4 51#define I8K_SMM_GET_TEMP 0x10a3
5114b474 52#define I8K_SMM_GET_TEMP_TYPE 0x11a3
7e0fa31d
DT		 53#define I8K_SMM_GET_DELL_SIG1 0xfea3
54#define I8K_SMM_GET_DELL_SIG2 0xffa3
1da177e4
LT		 55
56#define I8K_FAN_MULT 30
8f21d8e9 57#define I8K_FAN_MAX_RPM 30000
1da177e4
LT		 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
613655fa 70static DEFINE_MUTEX(i8k_mutex);
e70c9d5e 71static char bios_version[4];
7613663c 72static char bios_machineid[16];
949a9d70 73static struct device *i8k_hwmon_dev;
82ba1d3f 74static u32 i8k_hwmon_flags;
8f21d8e9 75static uint i8k_fan_mult = I8K_FAN_MULT;
7f69fb03
PR		 76static uint i8k_pwm_mult;
77static uint i8k_fan_max = I8K_FAN_HIGH;
2744d2fd 78static bool disallow_fan_type_call;
f480ea90 79static bool disallow_fan_support;
82ba1d3f
GR		 80
81#define I8K_HWMON_HAVE_TEMP1 (1 << 0)
d83c39de
GR		 82#define I8K_HWMON_HAVE_TEMP2 (1 << 1)
83#define I8K_HWMON_HAVE_TEMP3 (1 << 2)
84#define I8K_HWMON_HAVE_TEMP4 (1 << 3)
85#define I8K_HWMON_HAVE_FAN1 (1 << 4)
86#define I8K_HWMON_HAVE_FAN2 (1 << 5)
747bc8b0 87#define I8K_HWMON_HAVE_FAN3 (1 << 6)
1da177e4
LT		 88
89MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
a5afba16 90MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
039ae585 91MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver");
1da177e4 92MODULE_LICENSE("GPL");
a5afba16 93MODULE_ALIAS("i8k");
1da177e4 94
90ab5ee9 95static bool force;
1da177e4
LT		 96module_param(force, bool, 0);
97MODULE_PARM_DESC(force, "Force loading without checking for supported models");
98
90ab5ee9 99static bool ignore_dmi;
e70c9d5e
DT		 100module_param(ignore_dmi, bool, 0);
101MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
102
039ae585 103#if IS_ENABLED(CONFIG_I8K)
7613663c 104static bool restricted = true;
1da177e4 105module_param(restricted, bool, 0);
7613663c 106MODULE_PARM_DESC(restricted, "Restrict fan control and serial number to CAP_SYS_ADMIN (default: 1)");
1da177e4 107
90ab5ee9 108static bool power_status;
1da177e4 109module_param(power_status, bool, 0600);
7613663c 110MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k (default: 0)");
039ae585 111#endif
1da177e4 112
8f21d8e9 113static uint fan_mult;
7f69fb03 114module_param(fan_mult, uint, 0);
8f21d8e9 115MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)");
4ed99a27 116
8f21d8e9 117static uint fan_max;
7f69fb03 118module_param(fan_max, uint, 0);
8f21d8e9 119MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)");
81474fc2 120
8378b924 121struct smm_regs {
dec63ec3 122 unsigned int eax;
12186f51
GR		 123 unsigned int ebx __packed;
124 unsigned int ecx __packed;
125 unsigned int edx __packed;
126 unsigned int esi __packed;
127 unsigned int edi __packed;
8378b924 128};
1da177e4 129
1855256c 130static inline const char *i8k_get_dmi_data(int field)
e70c9d5e 131{
1855256c 132 const char *dmi_data = dmi_get_system_info(field);
4f005551
DT		 133
134 return dmi_data && *dmi_data ? dmi_data : "?";
e70c9d5e 135}
1da177e4
LT		 136
137/*
138 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
139 */
27046a3f 140static int i8k_smm_func(void *par)
1da177e4 141{
dec63ec3 142 int rc;
27046a3f 143 struct smm_regs *regs = par;
dec63ec3 144 int eax = regs->eax;
f36fdb9f 145
9d58bec0
PR		 146#ifdef DEBUG
147 int ebx = regs->ebx;
148 unsigned long duration;
149 ktime_t calltime, delta, rettime;
150
151 calltime = ktime_get();
152#endif
153
f36fdb9f 154 /* SMM requires CPU 0 */
27046a3f
JG		 155 if (smp_processor_id() != 0)
156 return -EBUSY;
dec63ec3 157
fe04f22f 158#if defined(CONFIG_X86_64)
22d3243d 159 asm volatile("pushq %%rax\n\t"
fe04f22f
BS		 160 "movl 0(%%rax),%%edx\n\t"
161 "pushq %%rdx\n\t"
162 "movl 4(%%rax),%%ebx\n\t"
163 "movl 8(%%rax),%%ecx\n\t"
164 "movl 12(%%rax),%%edx\n\t"
165 "movl 16(%%rax),%%esi\n\t"
166 "movl 20(%%rax),%%edi\n\t"
167 "popq %%rax\n\t"
168 "out %%al,$0xb2\n\t"
169 "out %%al,$0x84\n\t"
170 "xchgq %%rax,(%%rsp)\n\t"
171 "movl %%ebx,4(%%rax)\n\t"
172 "movl %%ecx,8(%%rax)\n\t"
173 "movl %%edx,12(%%rax)\n\t"
174 "movl %%esi,16(%%rax)\n\t"
175 "movl %%edi,20(%%rax)\n\t"
176 "popq %%rdx\n\t"
177 "movl %%edx,0(%%rax)\n\t"
bc1f419c
LT		 178 "pushfq\n\t"
179 "popq %%rax\n\t"
fe04f22f 180 "andl $1,%%eax\n"
12186f51 181 : "=a"(rc)
fe04f22f
BS		 182 : "a"(regs)
183 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
184#else
22d3243d 185 asm volatile("pushl %%eax\n\t"
dec63ec3
DT		 186 "movl 0(%%eax),%%edx\n\t"
187 "push %%edx\n\t"
188 "movl 4(%%eax),%%ebx\n\t"
189 "movl 8(%%eax),%%ecx\n\t"
190 "movl 12(%%eax),%%edx\n\t"
191 "movl 16(%%eax),%%esi\n\t"
192 "movl 20(%%eax),%%edi\n\t"
193 "popl %%eax\n\t"
194 "out %%al,$0xb2\n\t"
195 "out %%al,$0x84\n\t"
196 "xchgl %%eax,(%%esp)\n\t"
197 "movl %%ebx,4(%%eax)\n\t"
198 "movl %%ecx,8(%%eax)\n\t"
199 "movl %%edx,12(%%eax)\n\t"
200 "movl %%esi,16(%%eax)\n\t"
201 "movl %%edi,20(%%eax)\n\t"
202 "popl %%edx\n\t"
203 "movl %%edx,0(%%eax)\n\t"
204 "lahf\n\t"
205 "shrl $8,%%eax\n\t"
6b4e81db 206 "andl $1,%%eax\n"
12186f51 207 : "=a"(rc)
dec63ec3
DT		 208 : "a"(regs)
209 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
fe04f22f 210#endif
8378b924 211 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
f36fdb9f 212 rc = -EINVAL;
dec63ec3 213
9d58bec0
PR		 214#ifdef DEBUG
215 rettime = ktime_get();
216 delta = ktime_sub(rettime, calltime);
217 duration = ktime_to_ns(delta) >> 10;
218 pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lu usecs)\n", eax, ebx,
219 (rc ? 0xffff : regs->eax & 0xffff), duration);
220#endif
221
f36fdb9f 222 return rc;
1da177e4
LT		 223}
224
27046a3f
JG		 225/*
226 * Call the System Management Mode BIOS.
227 */
228static int i8k_smm(struct smm_regs *regs)
229{
230 int ret;
231
232 get_online_cpus();
233 ret = smp_call_on_cpu(0, i8k_smm_func, regs, true);
234 put_online_cpus();
235
236 return ret;
237}
238
1da177e4
LT		 239/*
240 * Read the fan status.
241 */
242static int i8k_get_fan_status(int fan)
243{
8378b924 244 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
1da177e4 245
f480ea90
PR		 246 if (disallow_fan_support)
247 return -EINVAL;
248
dec63ec3 249 regs.ebx = fan & 0xff;
8378b924 250 return i8k_smm(&regs) ? : regs.eax & 0xff;
1da177e4
LT		 251}
252
253/*
254 * Read the fan speed in RPM.
255 */
256static int i8k_get_fan_speed(int fan)
257{
8378b924 258 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
1da177e4 259
f480ea90
PR		 260 if (disallow_fan_support)
261 return -EINVAL;
262
dec63ec3 263 regs.ebx = fan & 0xff;
26d09382 264 return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
1da177e4
LT		 265}
266
f989e554
PR		 267/*
268 * Read the fan type.
269 */
5ce91714 270static int _i8k_get_fan_type(int fan)
f989e554
PR		 271{
272 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, };
273
f480ea90 274 if (disallow_fan_support || disallow_fan_type_call)
2744d2fd
PR		 275 return -EINVAL;
276
f989e554
PR		 277 regs.ebx = fan & 0xff;
278 return i8k_smm(&regs) ? : regs.eax & 0xff;
279}
280
5ce91714
PR		 281static int i8k_get_fan_type(int fan)
282{
283 /* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */
747bc8b0 284 static int types[3] = { INT_MIN, INT_MIN, INT_MIN };
5ce91714
PR		 285
286 if (types[fan] == INT_MIN)
287 types[fan] = _i8k_get_fan_type(fan);
288
289 return types[fan];
290}
291
8f21d8e9
PR		 292/*
293 * Read the fan nominal rpm for specific fan speed.
294 */
295static int i8k_get_fan_nominal_speed(int fan, int speed)
296{
297 struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, };
298
f480ea90
PR		 299 if (disallow_fan_support)
300 return -EINVAL;
301
8f21d8e9
PR		 302 regs.ebx = (fan & 0xff) | (speed << 8);
303 return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
304}
305
1da177e4
LT		 306/*
307 * Set the fan speed (off, low, high). Returns the new fan status.
308 */
309static int i8k_set_fan(int fan, int speed)
310{
8378b924 311 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
1da177e4 312
f480ea90
PR		 313 if (disallow_fan_support)
314 return -EINVAL;
315
81474fc2 316 speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed);
dec63ec3 317 regs.ebx = (fan & 0xff) | (speed << 8);
1da177e4 318
8378b924 319 return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
1da177e4
LT		 320}
321
5114b474
PR		 322static int i8k_get_temp_type(int sensor)
323{
324 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, };
325
326 regs.ebx = sensor & 0xff;
327 return i8k_smm(&regs) ? : regs.eax & 0xff;
328}
329
1da177e4
LT		 330/*
331 * Read the cpu temperature.
332 */
564132d9 333static int _i8k_get_temp(int sensor)
1da177e4 334{
564132d9
GR		 335 struct smm_regs regs = {
336 .eax = I8K_SMM_GET_TEMP,
337 .ebx = sensor & 0xff,
338 };
1da177e4 339
564132d9
GR		 340 return i8k_smm(&regs) ? : regs.eax & 0xff;
341}
8378b924 342
564132d9
GR		 343static int i8k_get_temp(int sensor)
344{
345 int temp = _i8k_get_temp(sensor);
1da177e4 346
dec63ec3
DT		 347 /*
348 * Sometimes the temperature sensor returns 0x99, which is out of range.
564132d9 349 * In this case we retry (once) before returning an error.
dec63ec3
DT		 350 # 1003655137 00000058 00005a4b
351 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
352 # 1003655139 00000054 00005c52
353 */
564132d9
GR		 354 if (temp == 0x99) {
355 msleep(100);
356 temp = _i8k_get_temp(sensor);
dec63ec3 357 }
564132d9
GR		 358 /*
359 * Return -ENODATA for all invalid temperatures.
360 *
361 * Known instances are the 0x99 value as seen above as well as
362 * 0xc1 (193), which may be returned when trying to read the GPU
363 * temperature if the system supports a GPU and it is currently
364 * turned off.
365 */
723493ca 366 if (temp > I8K_MAX_TEMP)
83d514d7 367 return -ENODATA;
1da177e4 368
dec63ec3 369 return temp;
1da177e4
LT		 370}
371
7e0fa31d 372static int i8k_get_dell_signature(int req_fn)
1da177e4 373{
7e0fa31d 374 struct smm_regs regs = { .eax = req_fn, };
dec63ec3 375 int rc;
1da177e4 376
12186f51
GR		 377 rc = i8k_smm(&regs);
378 if (rc < 0)
dec63ec3 379 return rc;
1da177e4 380
8378b924 381 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
1da177e4
LT		 382}
383
039ae585
PR		 384#if IS_ENABLED(CONFIG_I8K)
385
386/*
387 * Read the Fn key status.
388 */
389static int i8k_get_fn_status(void)
390{
391 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
392 int rc;
393
394 rc = i8k_smm(&regs);
395 if (rc < 0)
396 return rc;
397
398 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
399 case I8K_FN_UP:
400 return I8K_VOL_UP;
401 case I8K_FN_DOWN:
402 return I8K_VOL_DOWN;
403 case I8K_FN_MUTE:
404 return I8K_VOL_MUTE;
405 default:
406 return 0;
407 }
408}
409
410/*
411 * Read the power status.
412 */
413static int i8k_get_power_status(void)
414{
415 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
416 int rc;
417
418 rc = i8k_smm(&regs);
419 if (rc < 0)
420 return rc;
421
422 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
423}
424
425/*
426 * Procfs interface
427 */
428
d79b6f4d
FW		 429static int
430i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
1da177e4 431{
e70c9d5e 432 int val = 0;
dec63ec3
DT		 433 int speed;
434 unsigned char buff[16];
435 int __user *argp = (int __user *)arg;
436
437 if (!argp)
438 return -EINVAL;
439
440 switch (cmd) {
441 case I8K_BIOS_VERSION:
053ea640
PR		 442 if (!isdigit(bios_version[0]) || !isdigit(bios_version[1]) ||
443 !isdigit(bios_version[2]))
444 return -EINVAL;
445
e551b152
GR		 446 val = (bios_version[0] << 16) |
447 (bios_version[1] << 8) | bios_version[2];
dec63ec3
DT		 448 break;
449
450 case I8K_MACHINE_ID:
7613663c
PR		 451 if (restricted && !capable(CAP_SYS_ADMIN))
452 return -EPERM;
453
454 memset(buff, 0, sizeof(buff));
455 strlcpy(buff, bios_machineid, sizeof(buff));
dec63ec3
DT		 456 break;
457
458 case I8K_FN_STATUS:
459 val = i8k_get_fn_status();
460 break;
461
462 case I8K_POWER_STATUS:
463 val = i8k_get_power_status();
464 break;
465
466 case I8K_GET_TEMP:
7e0fa31d 467 val = i8k_get_temp(0);
dec63ec3
DT		 468 break;
469
470 case I8K_GET_SPEED:
8378b924 471 if (copy_from_user(&val, argp, sizeof(int)))
dec63ec3 472 return -EFAULT;
8378b924 473
dec63ec3
DT		 474 val = i8k_get_fan_speed(val);
475 break;
1da177e4 476
dec63ec3 477 case I8K_GET_FAN:
8378b924 478 if (copy_from_user(&val, argp, sizeof(int)))
dec63ec3 479 return -EFAULT;
8378b924 480
dec63ec3
DT		 481 val = i8k_get_fan_status(val);
482 break;
1da177e4 483
dec63ec3 484 case I8K_SET_FAN:
8378b924 485 if (restricted && !capable(CAP_SYS_ADMIN))
dec63ec3 486 return -EPERM;
8378b924
DT		 487
488 if (copy_from_user(&val, argp, sizeof(int)))
dec63ec3 489 return -EFAULT;
8378b924
DT		 490
491 if (copy_from_user(&speed, argp + 1, sizeof(int)))
dec63ec3 492 return -EFAULT;
8378b924 493
dec63ec3
DT		 494 val = i8k_set_fan(val, speed);
495 break;
1da177e4 496
dec63ec3
DT		 497 default:
498 return -EINVAL;
1da177e4 499 }
1da177e4 500
8378b924 501 if (val < 0)
dec63ec3 502 return val;
1da177e4 503
dec63ec3
DT		 504 switch (cmd) {
505 case I8K_BIOS_VERSION:
8378b924 506 if (copy_to_user(argp, &val, 4))
dec63ec3 507 return -EFAULT;
8378b924 508
dec63ec3
DT		 509 break;
510 case I8K_MACHINE_ID:
8378b924 511 if (copy_to_user(argp, buff, 16))
dec63ec3 512 return -EFAULT;
8378b924 513
dec63ec3
DT		 514 break;
515 default:
8378b924 516 if (copy_to_user(argp, &val, sizeof(int)))
dec63ec3 517 return -EFAULT;
8378b924 518
dec63ec3 519 break;
1da177e4 520 }
1da177e4 521
dec63ec3 522 return 0;
1da177e4
LT		 523}
524
d79b6f4d
FW		 525static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
526{
527 long ret;
528
613655fa 529 mutex_lock(&i8k_mutex);
d79b6f4d 530 ret = i8k_ioctl_unlocked(fp, cmd, arg);
613655fa 531 mutex_unlock(&i8k_mutex);
d79b6f4d
FW		 532
533 return ret;
534}
535
1da177e4
LT		 536/*
537 * Print the information for /proc/i8k.
538 */
352f8f8b 539static int i8k_proc_show(struct seq_file *seq, void *offset)
1da177e4 540{
352f8f8b 541 int fn_key, cpu_temp, ac_power;
dec63ec3
DT		 542 int left_fan, right_fan, left_speed, right_speed;
543
96de0e25
JE		 544 cpu_temp = i8k_get_temp(0); /* 11100 µs */
545 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */
546 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */
547 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */
548 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */
549 fn_key = i8k_get_fn_status(); /* 750 µs */
8378b924 550 if (power_status)
96de0e25 551 ac_power = i8k_get_power_status(); /* 14700 µs */
8378b924 552 else
dec63ec3 553 ac_power = -1;
dec63ec3
DT		 554
555 /*
556 * Info:
557 *
558 * 1) Format version (this will change if format changes)
559 * 2) BIOS version
560 * 3) BIOS machine ID
561 * 4) Cpu temperature
562 * 5) Left fan status
563 * 6) Right fan status
564 * 7) Left fan speed
565 * 8) Right fan speed
566 * 9) AC power
567 * 10) Fn Key status
568 */
3a267d3b
JP		 569 seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
570 I8K_PROC_FMT,
571 bios_version,
7613663c 572 (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : bios_machineid,
3a267d3b
JP		 573 cpu_temp,
574 left_fan, right_fan, left_speed, right_speed,
575 ac_power, fn_key);
576
577 return 0;
1da177e4
LT		 578}
579
352f8f8b 580static int i8k_open_fs(struct inode *inode, struct file *file)
1da177e4 581{
352f8f8b 582 return single_open(file, i8k_proc_show, NULL);
1da177e4
LT		 583}
584
039ae585
PR		 585static const struct file_operations i8k_fops = {
586 .owner = THIS_MODULE,
587 .open = i8k_open_fs,
588 .read = seq_read,
589 .llseek = seq_lseek,
590 .release = single_release,
591 .unlocked_ioctl = i8k_ioctl,
592};
593
594static void __init i8k_init_procfs(void)
595{
596 /* Register the proc entry */
597 proc_create("i8k", 0, NULL, &i8k_fops);
598}
599
600static void __exit i8k_exit_procfs(void)
601{
602 remove_proc_entry("i8k", NULL);
603}
604
605#else
606
607static inline void __init i8k_init_procfs(void)
608{
609}
610
611static inline void __exit i8k_exit_procfs(void)
612{
613}
614
615#endif
949a9d70
JD		 616
617/*
618 * Hwmon interface
619 */
620
5114b474
PR		 621static ssize_t i8k_hwmon_show_temp_label(struct device *dev,
622 struct device_attribute *devattr,
623 char *buf)
624{
625 static const char * const labels[] = {
626 "CPU",
627 "GPU",
628 "SODIMM",
629 "Other",
630 "Ambient",
631 "Other",
632 };
633 int index = to_sensor_dev_attr(devattr)->index;
634 int type;
635
636 type = i8k_get_temp_type(index);
637 if (type < 0)
638 return type;
639 if (type >= ARRAY_SIZE(labels))
640 type = ARRAY_SIZE(labels) - 1;
641 return sprintf(buf, "%s\n", labels[type]);
642}
643
949a9d70
JD		 644static ssize_t i8k_hwmon_show_temp(struct device *dev,
645 struct device_attribute *devattr,
646 char *buf)
647{
d83c39de
GR		 648 int index = to_sensor_dev_attr(devattr)->index;
649 int temp;
949a9d70 650
d83c39de
GR		 651 temp = i8k_get_temp(index);
652 if (temp < 0)
653 return temp;
654 return sprintf(buf, "%d\n", temp * 1000);
949a9d70
JD		 655}
656
f989e554
PR		 657static ssize_t i8k_hwmon_show_fan_label(struct device *dev,
658 struct device_attribute *devattr,
659 char *buf)
660{
661 static const char * const labels[] = {
662 "Processor Fan",
663 "Motherboard Fan",
664 "Video Fan",
665 "Power Supply Fan",
666 "Chipset Fan",
667 "Other Fan",
668 };
669 int index = to_sensor_dev_attr(devattr)->index;
670 bool dock = false;
671 int type;
672
673 type = i8k_get_fan_type(index);
674 if (type < 0)
675 return type;
676
677 if (type & 0x10) {
678 dock = true;
679 type &= 0x0F;
680 }
681
682 if (type >= ARRAY_SIZE(labels))
683 type = (ARRAY_SIZE(labels) - 1);
684
685 return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]);
686}
687
949a9d70
JD		 688static ssize_t i8k_hwmon_show_fan(struct device *dev,
689 struct device_attribute *devattr,
690 char *buf)
691{
692 int index = to_sensor_dev_attr(devattr)->index;
693 int fan_speed;
694
695 fan_speed = i8k_get_fan_speed(index);
696 if (fan_speed < 0)
697 return fan_speed;
698 return sprintf(buf, "%d\n", fan_speed);
699}
700
e7f5f275
GR		 701static ssize_t i8k_hwmon_show_pwm(struct device *dev,
702 struct device_attribute *devattr,
703 char *buf)
704{
705 int index = to_sensor_dev_attr(devattr)->index;
706 int status;
707
708 status = i8k_get_fan_status(index);
709 if (status < 0)
710 return -EIO;
81474fc2 711 return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255));
e7f5f275
GR		 712}
713
714static ssize_t i8k_hwmon_set_pwm(struct device *dev,
715 struct device_attribute *attr,
716 const char *buf, size_t count)
717{
718 int index = to_sensor_dev_attr(attr)->index;
719 unsigned long val;
720 int err;
721
722 err = kstrtoul(buf, 10, &val);
723 if (err)
724 return err;
81474fc2 725 val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max);
e7f5f275
GR		 726
727 mutex_lock(&i8k_mutex);
728 err = i8k_set_fan(index, val);
729 mutex_unlock(&i8k_mutex);
730
731 return err < 0 ? -EIO : count;
732}
733
d83c39de 734static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0);
5114b474
PR		 735static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
736 0);
d83c39de 737static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1);
5114b474
PR		 738static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
739 1);
d83c39de 740static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2);
5114b474
PR		 741static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
742 2);
d83c39de 743static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3);
5114b474
PR		 744static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
745 3);
f989e554
PR		 746static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 0);
747static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
748 0);
e7f5f275 749static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
f989e554 750 i8k_hwmon_set_pwm, 0);
949a9d70 751static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
f989e554
PR		 752 1);
753static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
754 1);
e7f5f275 755static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
f989e554 756 i8k_hwmon_set_pwm, 1);
747bc8b0
PR		 757static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
758 2);
759static SENSOR_DEVICE_ATTR(fan3_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
760 2);
761static SENSOR_DEVICE_ATTR(pwm3, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
762 i8k_hwmon_set_pwm, 2);
82ba1d3f
GR		 763
764static struct attribute *i8k_attrs[] = {
d83c39de 765 &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */
5114b474
PR		 766 &sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */
767 &sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */
768 &sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */
769 &sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */
770 &sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */
771 &sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */
772 &sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */
773 &sensor_dev_attr_fan1_input.dev_attr.attr, /* 8 */
f989e554
PR		 774 &sensor_dev_attr_fan1_label.dev_attr.attr, /* 9 */
775 &sensor_dev_attr_pwm1.dev_attr.attr, /* 10 */
776 &sensor_dev_attr_fan2_input.dev_attr.attr, /* 11 */
777 &sensor_dev_attr_fan2_label.dev_attr.attr, /* 12 */
778 &sensor_dev_attr_pwm2.dev_attr.attr, /* 13 */
747bc8b0
PR		 779 &sensor_dev_attr_fan3_input.dev_attr.attr, /* 14 */
780 &sensor_dev_attr_fan3_label.dev_attr.attr, /* 15 */
781 &sensor_dev_attr_pwm3.dev_attr.attr, /* 16 */
82ba1d3f
GR		 782 NULL
783};
949a9d70 784
82ba1d3f
GR		 785static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
786 int index)
949a9d70 787{
f480ea90
PR		 788 if (disallow_fan_support && index >= 8)
789 return 0;
2744d2fd 790 if (disallow_fan_type_call &&
747bc8b0 791 (index == 9 || index == 12 || index == 15))
2744d2fd 792 return 0;
5114b474
PR		 793 if (index >= 0 && index <= 1 &&
794 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
82ba1d3f 795 return 0;
5114b474
PR		 796 if (index >= 2 && index <= 3 &&
797 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
d83c39de 798 return 0;
5114b474
PR		 799 if (index >= 4 && index <= 5 &&
800 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
d83c39de 801 return 0;
5114b474
PR		 802 if (index >= 6 && index <= 7 &&
803 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
d83c39de 804 return 0;
f989e554 805 if (index >= 8 && index <= 10 &&
82ba1d3f
GR		 806 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
807 return 0;
f989e554 808 if (index >= 11 && index <= 13 &&
82ba1d3f
GR		 809 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
810 return 0;
747bc8b0
PR		 811 if (index >= 14 && index <= 16 &&
812 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN3))
813 return 0;
82ba1d3f
GR		 814
815 return attr->mode;
949a9d70
JD		 816}
817
82ba1d3f
GR		 818static const struct attribute_group i8k_group = {
819 .attrs = i8k_attrs,
820 .is_visible = i8k_is_visible,
821};
822__ATTRIBUTE_GROUPS(i8k);
823
949a9d70
JD		 824static int __init i8k_init_hwmon(void)
825{
826 int err;
827
82ba1d3f 828 i8k_hwmon_flags = 0;
949a9d70 829
672af223
PR		 830 /* CPU temperature attributes, if temperature type is OK */
831 err = i8k_get_temp_type(0);
832 if (err >= 0)
82ba1d3f 833 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1;
d83c39de 834 /* check for additional temperature sensors */
672af223
PR		 835 err = i8k_get_temp_type(1);
836 if (err >= 0)
d83c39de 837 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2;
672af223
PR		 838 err = i8k_get_temp_type(2);
839 if (err >= 0)
d83c39de 840 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3;
672af223
PR		 841 err = i8k_get_temp_type(3);
842 if (err >= 0)
d83c39de 843 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
949a9d70 844
5ce91714
PR		 845 /* First fan attributes, if fan status or type is OK */
846 err = i8k_get_fan_status(0);
847 if (err < 0)
848 err = i8k_get_fan_type(0);
82ba1d3f
GR		 849 if (err >= 0)
850 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
949a9d70 851
5ce91714
PR		 852 /* Second fan attributes, if fan status or type is OK */
853 err = i8k_get_fan_status(1);
854 if (err < 0)
855 err = i8k_get_fan_type(1);
82ba1d3f
GR		 856 if (err >= 0)
857 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
949a9d70 858
747bc8b0
PR		 859 /* Third fan attributes, if fan status or type is OK */
860 err = i8k_get_fan_status(2);
861 if (err < 0)
862 err = i8k_get_fan_type(2);
863 if (err >= 0)
864 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN3;
865
9026cae1 866 i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm",
039ae585 867 NULL, i8k_groups);
82ba1d3f
GR		 868 if (IS_ERR(i8k_hwmon_dev)) {
869 err = PTR_ERR(i8k_hwmon_dev);
870 i8k_hwmon_dev = NULL;
871 pr_err("hwmon registration failed (%d)\n", err);
872 return err;
873 }
949a9d70 874 return 0;
949a9d70
JD		 875}
876
81474fc2 877struct i8k_config_data {
7f69fb03
PR		 878 uint fan_mult;
879 uint fan_max;
81474fc2
GR		 880};
881
882enum i8k_configs {
7b883446
GR		 883 DELL_LATITUDE_D520,
884 DELL_PRECISION_490,
81474fc2 885 DELL_STUDIO,
34ae40f6 886 DELL_XPS,
81474fc2
GR		 887};
888
889static const struct i8k_config_data i8k_config_data[] = {
7b883446
GR		 890 [DELL_LATITUDE_D520] = {
891 .fan_mult = 1,
892 .fan_max = I8K_FAN_TURBO,
893 },
894 [DELL_PRECISION_490] = {
895 .fan_mult = 1,
896 .fan_max = I8K_FAN_TURBO,
897 },
81474fc2
GR		 898 [DELL_STUDIO] = {
899 .fan_mult = 1,
900 .fan_max = I8K_FAN_HIGH,
901 },
34ae40f6 902 [DELL_XPS] = {
81474fc2
GR		 903 .fan_mult = 1,
904 .fan_max = I8K_FAN_HIGH,
905 },
906};
907
6faadbbb 908static const struct dmi_system_id i8k_dmi_table[] __initconst = {
e70c9d5e
DT		 909 {
910 .ident = "Dell Inspiron",
911 .matches = {
912 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
913 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
914 },
915 },
916 {
917 .ident = "Dell Latitude",
918 .matches = {
919 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
920 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
921 },
922 },
7e0fa31d
DT		 923 {
924 .ident = "Dell Inspiron 2",
925 .matches = {
926 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
927 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
928 },
929 },
7b883446
GR		 930 {
931 .ident = "Dell Latitude D520",
932 .matches = {
933 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
934 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"),
935 },
936 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520],
937 },
7e0fa31d
DT		 938 {
939 .ident = "Dell Latitude 2",
940 .matches = {
941 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
942 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
943 },
944 },
a9000d03
NW		 945 { /* UK Inspiron 6400 */
946 .ident = "Dell Inspiron 3",
947 .matches = {
948 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
949 DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
950 },
951 },
48103c52
FS		 952 {
953 .ident = "Dell Inspiron 3",
954 .matches = {
955 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
956 DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
957 },
958 },
7b883446
GR		 959 {
960 .ident = "Dell Precision 490",
961 .matches = {
962 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
963 DMI_MATCH(DMI_PRODUCT_NAME,
964 "Precision WorkStation 490"),
965 },
966 .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490],
967 },
7ab21a86
AS		 968 {
969 .ident = "Dell Precision",
970 .matches = {
971 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
972 DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
973 },
974 },
bef2a508
FH		 975 {
976 .ident = "Dell Vostro",
977 .matches = {
978 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
979 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
980 },
981 },
9aa5b018
AC		 982 {
983 .ident = "Dell XPS421",
984 .matches = {
985 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
986 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
987 },
988 },
ff457bde
GR		 989 {
990 .ident = "Dell Studio",
991 .matches = {
992 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
993 DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
994 },
81474fc2 995 .driver_data = (void *)&i8k_config_data[DELL_STUDIO],
ff457bde 996 },
34ae40f6
GR		 997 {
998 .ident = "Dell XPS 13",
999 .matches = {
1000 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1001 DMI_MATCH(DMI_PRODUCT_NAME, "XPS13"),
1002 },
1003 .driver_data = (void *)&i8k_config_data[DELL_XPS],
1004 },
919a0304
GR		 1005 {
1006 .ident = "Dell XPS M140",
1007 .matches = {
1008 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1009 DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
1010 },
34ae40f6 1011 .driver_data = (void *)&i8k_config_data[DELL_XPS],
919a0304 1012 },
a4811b6c
PR		 1013 {
1014 .ident = "Dell XPS 15 9560",
1015 .matches = {
1016 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1017 DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9560"),
1018 },
1019 },
12186f51 1020 { }
e70c9d5e 1021};
1da177e4 1022
148b1fda
PR		 1023MODULE_DEVICE_TABLE(dmi, i8k_dmi_table);
1024
2744d2fd
PR		 1025/*
1026 * On some machines once I8K_SMM_GET_FAN_TYPE is issued then CPU fan speed
1027 * randomly going up and down due to bug in Dell SMM or BIOS. Here is blacklist
1028 * of affected Dell machines for which we disallow I8K_SMM_GET_FAN_TYPE call.
1029 * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121
1030 */
6faadbbb 1031static const struct dmi_system_id i8k_blacklist_fan_type_dmi_table[] __initconst = {
6220f4eb 1032 {
6220f4eb
TL		 1033 .ident = "Dell Studio XPS 8000",
1034 .matches = {
1035 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1036 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000"),
1037 },
1038 },
a4b45b25 1039 {
a4b45b25
PR		 1040 .ident = "Dell Studio XPS 8100",
1041 .matches = {
1042 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1043 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"),
1044 },
1045 },
2744d2fd
PR		 1046 {
1047 .ident = "Dell Inspiron 580",
1048 .matches = {
1049 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1050 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 580 "),
1051 },
1052 },
a4b45b25
PR		 1053 { }
1054};
1055
f480ea90
PR		 1056/*
1057 * On some machines all fan related SMM functions implemented by Dell BIOS
1058 * firmware freeze kernel for about 500ms. Until Dell fixes these problems fan
1059 * support for affected blacklisted Dell machines stay disabled.
1060 * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=195751
1061 */
1062static struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initdata = {
1063 {
1064 .ident = "Dell Inspiron 7720",
1065 .matches = {
1066 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1067 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
1068 },
1069 },
6fbc4232
ON		 1070 {
1071 .ident = "Dell Vostro 3360",
1072 .matches = {
1073 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1074 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
1075 },
1076 },
f480ea90
PR		 1077 { }
1078};
1079
1da177e4
LT		 1080/*
1081 * Probe for the presence of a supported laptop.
1082 */
1083static int __init i8k_probe(void)
1084{
26d09382 1085 const struct dmi_system_id *id;
8f21d8e9 1086 int fan, ret;
dec63ec3 1087
1da177e4 1088 /*
dec63ec3 1089 * Get DMI information
1da177e4 1090 */
2744d2fd 1091 if (!dmi_check_system(i8k_dmi_table)) {
e70c9d5e
DT		 1092 if (!ignore_dmi && !force)
1093 return -ENODEV;
1094
60e71aaf
GR		 1095 pr_info("not running on a supported Dell system.\n");
1096 pr_info("vendor=%s, model=%s, version=%s\n",
e70c9d5e
DT		 1097 i8k_get_dmi_data(DMI_SYS_VENDOR),
1098 i8k_get_dmi_data(DMI_PRODUCT_NAME),
1099 i8k_get_dmi_data(DMI_BIOS_VERSION));
1da177e4 1100 }
dec63ec3 1101
f480ea90
PR		 1102 if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) {
1103 pr_warn("broken Dell BIOS detected, disallow fan support\n");
1104 if (!force)
1105 disallow_fan_support = true;
1106 }
1107
836ad112
PR		 1108 if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) {
1109 pr_warn("broken Dell BIOS detected, disallow fan type call\n");
1110 if (!force)
1111 disallow_fan_type_call = true;
1112 }
2744d2fd 1113
12186f51
GR		 1114 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
1115 sizeof(bios_version));
7613663c
PR		 1116 strlcpy(bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
1117 sizeof(bios_machineid));
e70c9d5e 1118
1da177e4 1119 /*
dec63ec3 1120 * Get SMM Dell signature
1da177e4 1121 */
7e0fa31d
DT		 1122 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
1123 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
60e71aaf 1124 pr_err("unable to get SMM Dell signature\n");
e70c9d5e
DT		 1125 if (!force)
1126 return -ENODEV;
1da177e4 1127 }
1da177e4 1128
8f21d8e9
PR		 1129 /*
1130 * Set fan multiplier and maximal fan speed from dmi config
1131 * Values specified in module parameters override values from dmi
1132 */
26d09382 1133 id = dmi_first_match(i8k_dmi_table);
81474fc2
GR		 1134 if (id && id->driver_data) {
1135 const struct i8k_config_data *conf = id->driver_data;
8f21d8e9
PR		 1136 if (!fan_mult && conf->fan_mult)
1137 fan_mult = conf->fan_mult;
1138 if (!fan_max && conf->fan_max)
1139 fan_max = conf->fan_max;
81474fc2 1140 }
8f21d8e9
PR		 1141
1142 i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */
81474fc2 1143 i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);
26d09382 1144
8f21d8e9
PR		 1145 if (!fan_mult) {
1146 /*
1147 * Autodetect fan multiplier based on nominal rpm
1148 * If fan reports rpm value too high then set multiplier to 1
1149 */
1150 for (fan = 0; fan < 2; ++fan) {
1151 ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max);
1152 if (ret < 0)
1153 continue;
1154 if (ret > I8K_FAN_MAX_RPM)
1155 i8k_fan_mult = 1;
1156 break;
1157 }
1158 } else {
1159 /* Fan multiplier was specified in module param or in dmi */
1160 i8k_fan_mult = fan_mult;
1161 }
1162
dec63ec3 1163 return 0;
1da177e4
LT		 1164}
1165
8378b924 1166static int __init i8k_init(void)
1da177e4 1167{
949a9d70 1168 int err;
dec63ec3
DT		 1169
1170 /* Are we running on an supported laptop? */
e70c9d5e 1171 if (i8k_probe())
dec63ec3 1172 return -ENODEV;
dec63ec3 1173
949a9d70
JD		 1174 err = i8k_init_hwmon();
1175 if (err)
039ae585 1176 return err;
949a9d70 1177
039ae585 1178 i8k_init_procfs();
dec63ec3 1179 return 0;
1da177e4
LT		 1180}
1181
8378b924 1182static void __exit i8k_exit(void)
1da177e4 1183{
82ba1d3f 1184 hwmon_device_unregister(i8k_hwmon_dev);
039ae585 1185 i8k_exit_procfs();
1da177e4 1186}
1da177e4 1187
8378b924
DT		 1188module_init(i8k_init);
1189module_exit(i8k_exit);
Linux 6.x block layer and io_uring tree(s)