]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blame - drivers/char/i8k.c
projects / mirror_ubuntu-bionic-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
i8k: Add support for configurable maximum fan speed value
[mirror_ubuntu-bionic-kernel.git] / drivers / char / i8k.c
CommitLineData
1da177e4
LT		 1/*
2 * i8k.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>
f5a7f827 8 * Copyright (C) 2013 Guenter Roeck <linux@roeck-us.net>
949a9d70 9 *
1da177e4
LT		 10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2, or (at your option) any
13 * later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 */
20
60e71aaf
GR		 21#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
1da177e4
LT		 23#include <linux/module.h>
24#include <linux/types.h>
25#include <linux/init.h>
26#include <linux/proc_fs.h>
352f8f8b 27#include <linux/seq_file.h>
e70c9d5e 28#include <linux/dmi.h>
7e80d0d0 29#include <linux/capability.h>
613655fa 30#include <linux/mutex.h>
949a9d70
JD		 31#include <linux/hwmon.h>
32#include <linux/hwmon-sysfs.h>
12186f51
GR		 33#include <linux/uaccess.h>
34#include <linux/io.h>
f36fdb9f 35#include <linux/sched.h>
1da177e4
LT		 36
37#include <linux/i8k.h>
38
1da177e4
LT		 39#define I8K_SMM_FN_STATUS 0x0025
40#define I8K_SMM_POWER_STATUS 0x0069
41#define I8K_SMM_SET_FAN 0x01a3
42#define I8K_SMM_GET_FAN 0x00a3
43#define I8K_SMM_GET_SPEED 0x02a3
44#define I8K_SMM_GET_TEMP 0x10a3
7e0fa31d
DT		 45#define I8K_SMM_GET_DELL_SIG1 0xfea3
46#define I8K_SMM_GET_DELL_SIG2 0xffa3
1da177e4
LT		 47
48#define I8K_FAN_MULT 30
49#define I8K_MAX_TEMP 127
50
51#define I8K_FN_NONE 0x00
52#define I8K_FN_UP 0x01
53#define I8K_FN_DOWN 0x02
54#define I8K_FN_MUTE 0x04
55#define I8K_FN_MASK 0x07
56#define I8K_FN_SHIFT 8
57
58#define I8K_POWER_AC 0x05
59#define I8K_POWER_BATTERY 0x01
60
61#define I8K_TEMPERATURE_BUG 1
62
613655fa 63static DEFINE_MUTEX(i8k_mutex);
e70c9d5e 64static char bios_version[4];
949a9d70 65static struct device *i8k_hwmon_dev;
82ba1d3f 66static u32 i8k_hwmon_flags;
26d09382 67static int i8k_fan_mult;
81474fc2
GR		 68static int i8k_pwm_mult;
69static int i8k_fan_max = I8K_FAN_HIGH;
82ba1d3f
GR		 70
71#define I8K_HWMON_HAVE_TEMP1 (1 << 0)
d83c39de
GR		 72#define I8K_HWMON_HAVE_TEMP2 (1 << 1)
73#define I8K_HWMON_HAVE_TEMP3 (1 << 2)
74#define I8K_HWMON_HAVE_TEMP4 (1 << 3)
75#define I8K_HWMON_HAVE_FAN1 (1 << 4)
76#define I8K_HWMON_HAVE_FAN2 (1 << 5)
1da177e4
LT		 77
78MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
79MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
80MODULE_LICENSE("GPL");
81
90ab5ee9 82static bool force;
1da177e4
LT		 83module_param(force, bool, 0);
84MODULE_PARM_DESC(force, "Force loading without checking for supported models");
85
90ab5ee9 86static bool ignore_dmi;
e70c9d5e
DT		 87module_param(ignore_dmi, bool, 0);
88MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
89
90ab5ee9 90static bool restricted;
1da177e4
LT		 91module_param(restricted, bool, 0);
92MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
93
90ab5ee9 94static bool power_status;
1da177e4
LT		 95module_param(power_status, bool, 0600);
96MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
97
4ed99a27
JE		 98static int fan_mult = I8K_FAN_MULT;
99module_param(fan_mult, int, 0);
100MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with");
101
81474fc2
GR		 102static int fan_max = I8K_FAN_HIGH;
103module_param(fan_max, int, 0);
104MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed");
105
352f8f8b 106static int i8k_open_fs(struct inode *inode, struct file *file);
d79b6f4d 107static long i8k_ioctl(struct file *, unsigned int, unsigned long);
1da177e4 108
62322d25 109static const struct file_operations i8k_fops = {
1b502217 110 .owner = THIS_MODULE,
352f8f8b
DT		 111 .open = i8k_open_fs,
112 .read = seq_read,
113 .llseek = seq_lseek,
114 .release = single_release,
d79b6f4d 115 .unlocked_ioctl = i8k_ioctl,
1da177e4
LT		 116};
117
8378b924 118struct smm_regs {
dec63ec3 119 unsigned int eax;
12186f51
GR		 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;
8378b924 125};
1da177e4 126
1855256c 127static inline const char *i8k_get_dmi_data(int field)
e70c9d5e 128{
1855256c 129 const char *dmi_data = dmi_get_system_info(field);
4f005551
DT		 130
131 return dmi_data && *dmi_data ? dmi_data : "?";
e70c9d5e 132}
1da177e4
LT		 133
134/*
135 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
136 */
8378b924 137static int i8k_smm(struct smm_regs *regs)
1da177e4 138{
dec63ec3
DT		 139 int rc;
140 int eax = regs->eax;
f36fdb9f
GR		 141 cpumask_var_t old_mask;
142
143 /* SMM requires CPU 0 */
144 if (!alloc_cpumask_var(&old_mask, GFP_KERNEL))
145 return -ENOMEM;
146 cpumask_copy(old_mask, &current->cpus_allowed);
147 set_cpus_allowed_ptr(current, cpumask_of(0));
148 if (smp_processor_id() != 0) {
149 rc = -EBUSY;
150 goto out;
151 }
dec63ec3 152
fe04f22f 153#if defined(CONFIG_X86_64)
22d3243d 154 asm volatile("pushq %%rax\n\t"
fe04f22f
BS		 155 "movl 0(%%rax),%%edx\n\t"
156 "pushq %%rdx\n\t"
157 "movl 4(%%rax),%%ebx\n\t"
158 "movl 8(%%rax),%%ecx\n\t"
159 "movl 12(%%rax),%%edx\n\t"
160 "movl 16(%%rax),%%esi\n\t"
161 "movl 20(%%rax),%%edi\n\t"
162 "popq %%rax\n\t"
163 "out %%al,$0xb2\n\t"
164 "out %%al,$0x84\n\t"
165 "xchgq %%rax,(%%rsp)\n\t"
166 "movl %%ebx,4(%%rax)\n\t"
167 "movl %%ecx,8(%%rax)\n\t"
168 "movl %%edx,12(%%rax)\n\t"
169 "movl %%esi,16(%%rax)\n\t"
170 "movl %%edi,20(%%rax)\n\t"
171 "popq %%rdx\n\t"
172 "movl %%edx,0(%%rax)\n\t"
bc1f419c
LT		 173 "pushfq\n\t"
174 "popq %%rax\n\t"
fe04f22f 175 "andl $1,%%eax\n"
12186f51 176 : "=a"(rc)
fe04f22f
BS		 177 : "a"(regs)
178 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
179#else
22d3243d 180 asm volatile("pushl %%eax\n\t"
dec63ec3
DT		 181 "movl 0(%%eax),%%edx\n\t"
182 "push %%edx\n\t"
183 "movl 4(%%eax),%%ebx\n\t"
184 "movl 8(%%eax),%%ecx\n\t"
185 "movl 12(%%eax),%%edx\n\t"
186 "movl 16(%%eax),%%esi\n\t"
187 "movl 20(%%eax),%%edi\n\t"
188 "popl %%eax\n\t"
189 "out %%al,$0xb2\n\t"
190 "out %%al,$0x84\n\t"
191 "xchgl %%eax,(%%esp)\n\t"
192 "movl %%ebx,4(%%eax)\n\t"
193 "movl %%ecx,8(%%eax)\n\t"
194 "movl %%edx,12(%%eax)\n\t"
195 "movl %%esi,16(%%eax)\n\t"
196 "movl %%edi,20(%%eax)\n\t"
197 "popl %%edx\n\t"
198 "movl %%edx,0(%%eax)\n\t"
199 "lahf\n\t"
200 "shrl $8,%%eax\n\t"
6b4e81db 201 "andl $1,%%eax\n"
12186f51 202 : "=a"(rc)
dec63ec3
DT		 203 : "a"(regs)
204 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
fe04f22f 205#endif
8378b924 206 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
f36fdb9f 207 rc = -EINVAL;
dec63ec3 208
f36fdb9f
GR		 209out:
210 set_cpus_allowed_ptr(current, old_mask);
211 free_cpumask_var(old_mask);
212 return rc;
1da177e4
LT		 213}
214
1da177e4
LT		 215/*
216 * Read the Fn key status.
217 */
218static int i8k_get_fn_status(void)
219{
8378b924 220 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
dec63ec3
DT		 221 int rc;
222
12186f51
GR		 223 rc = i8k_smm(&regs);
224 if (rc < 0)
dec63ec3 225 return rc;
dec63ec3
DT		 226
227 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
228 case I8K_FN_UP:
229 return I8K_VOL_UP;
230 case I8K_FN_DOWN:
231 return I8K_VOL_DOWN;
232 case I8K_FN_MUTE:
233 return I8K_VOL_MUTE;
234 default:
235 return 0;
236 }
1da177e4
LT		 237}
238
239/*
240 * Read the power status.
241 */
242static int i8k_get_power_status(void)
243{
8378b924 244 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
dec63ec3
DT		 245 int rc;
246
12186f51
GR		 247 rc = i8k_smm(&regs);
248 if (rc < 0)
dec63ec3 249 return rc;
dec63ec3 250
8378b924 251 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
1da177e4
LT		 252}
253
254/*
255 * Read the fan status.
256 */
257static int i8k_get_fan_status(int fan)
258{
8378b924 259 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
1da177e4 260
dec63ec3 261 regs.ebx = fan & 0xff;
8378b924 262 return i8k_smm(&regs) ? : regs.eax & 0xff;
1da177e4
LT		 263}
264
265/*
266 * Read the fan speed in RPM.
267 */
268static int i8k_get_fan_speed(int fan)
269{
8378b924 270 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
1da177e4 271
dec63ec3 272 regs.ebx = fan & 0xff;
26d09382 273 return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
1da177e4
LT		 274}
275
276/*
277 * Set the fan speed (off, low, high). Returns the new fan status.
278 */
279static int i8k_set_fan(int fan, int speed)
280{
8378b924 281 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
1da177e4 282
81474fc2 283 speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed);
dec63ec3 284 regs.ebx = (fan & 0xff) | (speed << 8);
1da177e4 285
8378b924 286 return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
1da177e4
LT		 287}
288
289/*
290 * Read the cpu temperature.
291 */
7e0fa31d 292static int i8k_get_temp(int sensor)
1da177e4 293{
8378b924 294 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, };
dec63ec3
DT		 295 int rc;
296 int temp;
1da177e4
LT		 297
298#ifdef I8K_TEMPERATURE_BUG
d83c39de 299 static int prev[4];
1da177e4 300#endif
7e0fa31d 301 regs.ebx = sensor & 0xff;
12186f51
GR		 302 rc = i8k_smm(&regs);
303 if (rc < 0)
dec63ec3 304 return rc;
8378b924 305
dec63ec3 306 temp = regs.eax & 0xff;
1da177e4
LT		 307
308#ifdef I8K_TEMPERATURE_BUG
dec63ec3
DT		 309 /*
310 * Sometimes the temperature sensor returns 0x99, which is out of range.
311 * In this case we return (once) the previous cached value. For example:
312 # 1003655137 00000058 00005a4b
313 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
314 # 1003655139 00000054 00005c52
315 */
316 if (temp > I8K_MAX_TEMP) {
d83c39de
GR		 317 temp = prev[sensor];
318 prev[sensor] = I8K_MAX_TEMP;
dec63ec3 319 } else {
d83c39de 320 prev[sensor] = temp;
dec63ec3 321 }
1da177e4
LT		 322#endif
323
dec63ec3 324 return temp;
1da177e4
LT		 325}
326
7e0fa31d 327static int i8k_get_dell_signature(int req_fn)
1da177e4 328{
7e0fa31d 329 struct smm_regs regs = { .eax = req_fn, };
dec63ec3 330 int rc;
1da177e4 331
12186f51
GR		 332 rc = i8k_smm(&regs);
333 if (rc < 0)
dec63ec3 334 return rc;
1da177e4 335
8378b924 336 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
1da177e4
LT		 337}
338
d79b6f4d
FW		 339static int
340i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
1da177e4 341{
e70c9d5e 342 int val = 0;
dec63ec3
DT		 343 int speed;
344 unsigned char buff[16];
345 int __user *argp = (int __user *)arg;
346
347 if (!argp)
348 return -EINVAL;
349
350 switch (cmd) {
351 case I8K_BIOS_VERSION:
e551b152
GR		 352 val = (bios_version[0] << 16) |
353 (bios_version[1] << 8) | bios_version[2];
dec63ec3
DT		 354 break;
355
356 case I8K_MACHINE_ID:
357 memset(buff, 0, 16);
12186f51
GR		 358 strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
359 sizeof(buff));
dec63ec3
DT		 360 break;
361
362 case I8K_FN_STATUS:
363 val = i8k_get_fn_status();
364 break;
365
366 case I8K_POWER_STATUS:
367 val = i8k_get_power_status();
368 break;
369
370 case I8K_GET_TEMP:
7e0fa31d 371 val = i8k_get_temp(0);
dec63ec3
DT		 372 break;
373
374 case I8K_GET_SPEED:
8378b924 375 if (copy_from_user(&val, argp, sizeof(int)))
dec63ec3 376 return -EFAULT;
8378b924 377
dec63ec3
DT		 378 val = i8k_get_fan_speed(val);
379 break;
1da177e4 380
dec63ec3 381 case I8K_GET_FAN:
8378b924 382 if (copy_from_user(&val, argp, sizeof(int)))
dec63ec3 383 return -EFAULT;
8378b924 384
dec63ec3
DT		 385 val = i8k_get_fan_status(val);
386 break;
1da177e4 387
dec63ec3 388 case I8K_SET_FAN:
8378b924 389 if (restricted && !capable(CAP_SYS_ADMIN))
dec63ec3 390 return -EPERM;
8378b924
DT		 391
392 if (copy_from_user(&val, argp, sizeof(int)))
dec63ec3 393 return -EFAULT;
8378b924
DT		 394
395 if (copy_from_user(&speed, argp + 1, sizeof(int)))
dec63ec3 396 return -EFAULT;
8378b924 397
dec63ec3
DT		 398 val = i8k_set_fan(val, speed);
399 break;
1da177e4 400
dec63ec3
DT		 401 default:
402 return -EINVAL;
1da177e4 403 }
1da177e4 404
8378b924 405 if (val < 0)
dec63ec3 406 return val;
1da177e4 407
dec63ec3
DT		 408 switch (cmd) {
409 case I8K_BIOS_VERSION:
8378b924 410 if (copy_to_user(argp, &val, 4))
dec63ec3 411 return -EFAULT;
8378b924 412
dec63ec3
DT		 413 break;
414 case I8K_MACHINE_ID:
8378b924 415 if (copy_to_user(argp, buff, 16))
dec63ec3 416 return -EFAULT;
8378b924 417
dec63ec3
DT		 418 break;
419 default:
8378b924 420 if (copy_to_user(argp, &val, sizeof(int)))
dec63ec3 421 return -EFAULT;
8378b924 422
dec63ec3 423 break;
1da177e4 424 }
1da177e4 425
dec63ec3 426 return 0;
1da177e4
LT		 427}
428
d79b6f4d
FW		 429static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
430{
431 long ret;
432
613655fa 433 mutex_lock(&i8k_mutex);
d79b6f4d 434 ret = i8k_ioctl_unlocked(fp, cmd, arg);
613655fa 435 mutex_unlock(&i8k_mutex);
d79b6f4d
FW		 436
437 return ret;
438}
439
1da177e4
LT		 440/*
441 * Print the information for /proc/i8k.
442 */
352f8f8b 443static int i8k_proc_show(struct seq_file *seq, void *offset)
1da177e4 444{
352f8f8b 445 int fn_key, cpu_temp, ac_power;
dec63ec3
DT		 446 int left_fan, right_fan, left_speed, right_speed;
447
96de0e25
JE		 448 cpu_temp = i8k_get_temp(0); /* 11100 µs */
449 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */
450 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */
451 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */
452 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */
453 fn_key = i8k_get_fn_status(); /* 750 µs */
8378b924 454 if (power_status)
96de0e25 455 ac_power = i8k_get_power_status(); /* 14700 µs */
8378b924 456 else
dec63ec3 457 ac_power = -1;
dec63ec3
DT		 458
459 /*
460 * Info:
461 *
462 * 1) Format version (this will change if format changes)
463 * 2) BIOS version
464 * 3) BIOS machine ID
465 * 4) Cpu temperature
466 * 5) Left fan status
467 * 6) Right fan status
468 * 7) Left fan speed
469 * 8) Right fan speed
470 * 9) AC power
471 * 10) Fn Key status
472 */
352f8f8b
DT		 473 return seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
474 I8K_PROC_FMT,
475 bios_version,
4f005551 476 i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
352f8f8b
DT		 477 cpu_temp,
478 left_fan, right_fan, left_speed, right_speed,
479 ac_power, fn_key);
1da177e4
LT		 480}
481
352f8f8b 482static int i8k_open_fs(struct inode *inode, struct file *file)
1da177e4 483{
352f8f8b 484 return single_open(file, i8k_proc_show, NULL);
1da177e4
LT		 485}
486
949a9d70
JD		 487
488/*
489 * Hwmon interface
490 */
491
492static ssize_t i8k_hwmon_show_temp(struct device *dev,
493 struct device_attribute *devattr,
494 char *buf)
495{
d83c39de
GR		 496 int index = to_sensor_dev_attr(devattr)->index;
497 int temp;
949a9d70 498
d83c39de
GR		 499 temp = i8k_get_temp(index);
500 if (temp < 0)
501 return temp;
502 return sprintf(buf, "%d\n", temp * 1000);
949a9d70
JD		 503}
504
505static ssize_t i8k_hwmon_show_fan(struct device *dev,
506 struct device_attribute *devattr,
507 char *buf)
508{
509 int index = to_sensor_dev_attr(devattr)->index;
510 int fan_speed;
511
512 fan_speed = i8k_get_fan_speed(index);
513 if (fan_speed < 0)
514 return fan_speed;
515 return sprintf(buf, "%d\n", fan_speed);
516}
517
e7f5f275
GR		 518static ssize_t i8k_hwmon_show_pwm(struct device *dev,
519 struct device_attribute *devattr,
520 char *buf)
521{
522 int index = to_sensor_dev_attr(devattr)->index;
523 int status;
524
525 status = i8k_get_fan_status(index);
526 if (status < 0)
527 return -EIO;
81474fc2 528 return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255));
e7f5f275
GR		 529}
530
531static ssize_t i8k_hwmon_set_pwm(struct device *dev,
532 struct device_attribute *attr,
533 const char *buf, size_t count)
534{
535 int index = to_sensor_dev_attr(attr)->index;
536 unsigned long val;
537 int err;
538
539 err = kstrtoul(buf, 10, &val);
540 if (err)
541 return err;
81474fc2 542 val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max);
e7f5f275
GR		 543
544 mutex_lock(&i8k_mutex);
545 err = i8k_set_fan(index, val);
546 mutex_unlock(&i8k_mutex);
547
548 return err < 0 ? -EIO : count;
549}
550
d83c39de
GR		 551static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0);
552static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1);
553static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2);
554static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3);
949a9d70
JD		 555static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
556 I8K_FAN_LEFT);
e7f5f275
GR		 557static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
558 i8k_hwmon_set_pwm, I8K_FAN_LEFT);
949a9d70
JD		 559static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
560 I8K_FAN_RIGHT);
e7f5f275
GR		 561static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
562 i8k_hwmon_set_pwm, I8K_FAN_RIGHT);
82ba1d3f
GR		 563
564static struct attribute *i8k_attrs[] = {
d83c39de 565 &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */
b12ce5f2
GR		 566 &sensor_dev_attr_temp2_input.dev_attr.attr, /* 1 */
567 &sensor_dev_attr_temp3_input.dev_attr.attr, /* 2 */
568 &sensor_dev_attr_temp4_input.dev_attr.attr, /* 3 */
569 &sensor_dev_attr_fan1_input.dev_attr.attr, /* 4 */
570 &sensor_dev_attr_pwm1.dev_attr.attr, /* 5 */
571 &sensor_dev_attr_fan2_input.dev_attr.attr, /* 6 */
572 &sensor_dev_attr_pwm2.dev_attr.attr, /* 7 */
82ba1d3f
GR		 573 NULL
574};
949a9d70 575
82ba1d3f
GR		 576static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
577 int index)
949a9d70 578{
b12ce5f2 579 if (index == 0 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
82ba1d3f 580 return 0;
b12ce5f2 581 if (index == 1 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
d83c39de 582 return 0;
b12ce5f2 583 if (index == 2 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
d83c39de 584 return 0;
b12ce5f2 585 if (index == 3 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
d83c39de 586 return 0;
b12ce5f2 587 if (index >= 4 && index <= 5 &&
82ba1d3f
GR		 588 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
589 return 0;
b12ce5f2 590 if (index >= 6 && index <= 7 &&
82ba1d3f
GR		 591 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
592 return 0;
593
594 return attr->mode;
949a9d70
JD		 595}
596
82ba1d3f
GR		 597static const struct attribute_group i8k_group = {
598 .attrs = i8k_attrs,
599 .is_visible = i8k_is_visible,
600};
601__ATTRIBUTE_GROUPS(i8k);
602
949a9d70
JD		 603static int __init i8k_init_hwmon(void)
604{
605 int err;
606
82ba1d3f 607 i8k_hwmon_flags = 0;
949a9d70
JD		 608
609 /* CPU temperature attributes, if temperature reading is OK */
610 err = i8k_get_temp(0);
82ba1d3f
GR		 611 if (err >= 0)
612 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1;
d83c39de
GR		 613 /* check for additional temperature sensors */
614 err = i8k_get_temp(1);
615 if (err >= 0)
616 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2;
617 err = i8k_get_temp(2);
618 if (err >= 0)
619 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3;
620 err = i8k_get_temp(3);
621 if (err >= 0)
622 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
949a9d70
JD		 623
624 /* Left fan attributes, if left fan is present */
625 err = i8k_get_fan_status(I8K_FAN_LEFT);
82ba1d3f
GR		 626 if (err >= 0)
627 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
949a9d70
JD		 628
629 /* Right fan attributes, if right fan is present */
630 err = i8k_get_fan_status(I8K_FAN_RIGHT);
82ba1d3f
GR		 631 if (err >= 0)
632 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
949a9d70 633
82ba1d3f
GR		 634 i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "i8k", NULL,
635 i8k_groups);
636 if (IS_ERR(i8k_hwmon_dev)) {
637 err = PTR_ERR(i8k_hwmon_dev);
638 i8k_hwmon_dev = NULL;
639 pr_err("hwmon registration failed (%d)\n", err);
640 return err;
641 }
949a9d70 642 return 0;
949a9d70
JD		 643}
644
81474fc2
GR		 645struct i8k_config_data {
646 int fan_mult;
647 int fan_max;
648};
649
650enum i8k_configs {
651 DELL_STUDIO,
652 DELL_XPS_M140,
653};
654
655static const struct i8k_config_data i8k_config_data[] = {
656 [DELL_STUDIO] = {
657 .fan_mult = 1,
658 .fan_max = I8K_FAN_HIGH,
659 },
660 [DELL_XPS_M140] = {
661 .fan_mult = 1,
662 .fan_max = I8K_FAN_HIGH,
663 },
664};
665
12186f51 666static struct dmi_system_id i8k_dmi_table[] __initdata = {
e70c9d5e
DT		 667 {
668 .ident = "Dell Inspiron",
669 .matches = {
670 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
671 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
672 },
673 },
674 {
675 .ident = "Dell Latitude",
676 .matches = {
677 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
678 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
679 },
680 },
7e0fa31d
DT		 681 {
682 .ident = "Dell Inspiron 2",
683 .matches = {
684 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
685 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
686 },
687 },
688 {
689 .ident = "Dell Latitude 2",
690 .matches = {
691 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
692 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
693 },
694 },
a9000d03
NW		 695 { /* UK Inspiron 6400 */
696 .ident = "Dell Inspiron 3",
697 .matches = {
698 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
699 DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
700 },
701 },
48103c52
FS		 702 {
703 .ident = "Dell Inspiron 3",
704 .matches = {
705 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
706 DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
707 },
708 },
7ab21a86
AS		 709 {
710 .ident = "Dell Precision",
711 .matches = {
712 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
713 DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
714 },
715 },
bef2a508
FH		 716 {
717 .ident = "Dell Vostro",
718 .matches = {
719 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
720 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
721 },
722 },
9aa5b018
AC		 723 {
724 .ident = "Dell XPS421",
725 .matches = {
726 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
727 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
728 },
729 },
ff457bde
GR		 730 {
731 .ident = "Dell Studio",
732 .matches = {
733 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
734 DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
735 },
81474fc2 736 .driver_data = (void *)&i8k_config_data[DELL_STUDIO],
ff457bde 737 },
919a0304
GR		 738 {
739 .ident = "Dell XPS M140",
740 .matches = {
741 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
742 DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
743 },
81474fc2 744 .driver_data = (void *)&i8k_config_data[DELL_XPS_M140],
919a0304 745 },
12186f51 746 { }
e70c9d5e 747};
1da177e4
LT		 748
749/*
750 * Probe for the presence of a supported laptop.
751 */
752static int __init i8k_probe(void)
753{
26d09382 754 const struct dmi_system_id *id;
dec63ec3 755
1da177e4 756 /*
dec63ec3 757 * Get DMI information
1da177e4 758 */
e70c9d5e
DT		 759 if (!dmi_check_system(i8k_dmi_table)) {
760 if (!ignore_dmi && !force)
761 return -ENODEV;
762
60e71aaf
GR		 763 pr_info("not running on a supported Dell system.\n");
764 pr_info("vendor=%s, model=%s, version=%s\n",
e70c9d5e
DT		 765 i8k_get_dmi_data(DMI_SYS_VENDOR),
766 i8k_get_dmi_data(DMI_PRODUCT_NAME),
767 i8k_get_dmi_data(DMI_BIOS_VERSION));
1da177e4 768 }
dec63ec3 769
12186f51
GR		 770 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
771 sizeof(bios_version));
e70c9d5e 772
1da177e4 773 /*
dec63ec3 774 * Get SMM Dell signature
1da177e4 775 */
7e0fa31d
DT		 776 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
777 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
60e71aaf 778 pr_err("unable to get SMM Dell signature\n");
e70c9d5e
DT		 779 if (!force)
780 return -ENODEV;
1da177e4 781 }
1da177e4 782
26d09382 783 i8k_fan_mult = fan_mult;
81474fc2 784 i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */
26d09382 785 id = dmi_first_match(i8k_dmi_table);
81474fc2
GR		 786 if (id && id->driver_data) {
787 const struct i8k_config_data *conf = id->driver_data;
788
789 if (fan_mult == I8K_FAN_MULT && conf->fan_mult)
790 i8k_fan_mult = conf->fan_mult;
791 if (fan_max == I8K_FAN_HIGH && conf->fan_max)
792 i8k_fan_max = conf->fan_max;
793 }
794 i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);
26d09382 795
dec63ec3 796 return 0;
1da177e4
LT		 797}
798
8378b924 799static int __init i8k_init(void)
1da177e4 800{
dec63ec3 801 struct proc_dir_entry *proc_i8k;
949a9d70 802 int err;
dec63ec3
DT		 803
804 /* Are we running on an supported laptop? */
e70c9d5e 805 if (i8k_probe())
dec63ec3 806 return -ENODEV;
dec63ec3
DT		 807
808 /* Register the proc entry */
1b502217 809 proc_i8k = proc_create("i8k", 0, NULL, &i8k_fops);
352f8f8b 810 if (!proc_i8k)
dec63ec3 811 return -ENOENT;
352f8f8b 812
949a9d70
JD		 813 err = i8k_init_hwmon();
814 if (err)
815 goto exit_remove_proc;
816
dec63ec3 817 return 0;
949a9d70
JD		 818
819 exit_remove_proc:
820 remove_proc_entry("i8k", NULL);
821 return err;
1da177e4
LT		 822}
823
8378b924 824static void __exit i8k_exit(void)
1da177e4 825{
82ba1d3f 826 hwmon_device_unregister(i8k_hwmon_dev);
dec63ec3 827 remove_proc_entry("i8k", NULL);
1da177e4 828}
1da177e4 829
8378b924
DT		 830module_init(i8k_init);
831module_exit(i8k_exit);
ubuntu-bionic-kernel mirror