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Merge tag 'pwm/for-4.1-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry...
[deliverable/linux.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>
564132d9 8 * Copyright (C) 2013, 2014 Guenter Roeck <linux@roeck-us.net>
8f21d8e9 9 * Copyright (C) 2014 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
564132d9 24#include <linux/delay.h>
1da177e4
LT		 25#include <linux/module.h>
26#include <linux/types.h>
27#include <linux/init.h>
28#include <linux/proc_fs.h>
352f8f8b 29#include <linux/seq_file.h>
e70c9d5e 30#include <linux/dmi.h>
7e80d0d0 31#include <linux/capability.h>
613655fa 32#include <linux/mutex.h>
949a9d70
JD		 33#include <linux/hwmon.h>
34#include <linux/hwmon-sysfs.h>
12186f51
GR		 35#include <linux/uaccess.h>
36#include <linux/io.h>
f36fdb9f 37#include <linux/sched.h>
1da177e4
LT		 38
39#include <linux/i8k.h>
40
1da177e4
LT		 41#define I8K_SMM_FN_STATUS 0x0025
42#define I8K_SMM_POWER_STATUS 0x0069
43#define I8K_SMM_SET_FAN 0x01a3
44#define I8K_SMM_GET_FAN 0x00a3
45#define I8K_SMM_GET_SPEED 0x02a3
f989e554 46#define I8K_SMM_GET_FAN_TYPE 0x03a3
8f21d8e9 47#define I8K_SMM_GET_NOM_SPEED 0x04a3
1da177e4 48#define I8K_SMM_GET_TEMP 0x10a3
5114b474 49#define I8K_SMM_GET_TEMP_TYPE 0x11a3
7e0fa31d
DT		 50#define I8K_SMM_GET_DELL_SIG1 0xfea3
51#define I8K_SMM_GET_DELL_SIG2 0xffa3
1da177e4
LT		 52
53#define I8K_FAN_MULT 30
8f21d8e9 54#define I8K_FAN_MAX_RPM 30000
1da177e4
LT		 55#define I8K_MAX_TEMP 127
56
57#define I8K_FN_NONE 0x00
58#define I8K_FN_UP 0x01
59#define I8K_FN_DOWN 0x02
60#define I8K_FN_MUTE 0x04
61#define I8K_FN_MASK 0x07
62#define I8K_FN_SHIFT 8
63
64#define I8K_POWER_AC 0x05
65#define I8K_POWER_BATTERY 0x01
66
613655fa 67static DEFINE_MUTEX(i8k_mutex);
e70c9d5e 68static char bios_version[4];
949a9d70 69static struct device *i8k_hwmon_dev;
82ba1d3f 70static u32 i8k_hwmon_flags;
8f21d8e9 71static uint i8k_fan_mult = I8K_FAN_MULT;
7f69fb03
PR		 72static uint i8k_pwm_mult;
73static uint i8k_fan_max = I8K_FAN_HIGH;
82ba1d3f
GR		 74
75#define I8K_HWMON_HAVE_TEMP1 (1 << 0)
d83c39de
GR		 76#define I8K_HWMON_HAVE_TEMP2 (1 << 1)
77#define I8K_HWMON_HAVE_TEMP3 (1 << 2)
78#define I8K_HWMON_HAVE_TEMP4 (1 << 3)
79#define I8K_HWMON_HAVE_FAN1 (1 << 4)
80#define I8K_HWMON_HAVE_FAN2 (1 << 5)
1da177e4
LT		 81
82MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
83MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
84MODULE_LICENSE("GPL");
85
90ab5ee9 86static bool force;
1da177e4
LT		 87module_param(force, bool, 0);
88MODULE_PARM_DESC(force, "Force loading without checking for supported models");
89
90ab5ee9 90static bool ignore_dmi;
e70c9d5e
DT		 91module_param(ignore_dmi, bool, 0);
92MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
93
90ab5ee9 94static bool restricted;
1da177e4
LT		 95module_param(restricted, bool, 0);
96MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
97
90ab5ee9 98static bool power_status;
1da177e4
LT		 99module_param(power_status, bool, 0600);
100MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
101
8f21d8e9 102static uint fan_mult;
7f69fb03 103module_param(fan_mult, uint, 0);
8f21d8e9 104MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)");
4ed99a27 105
8f21d8e9 106static uint fan_max;
7f69fb03 107module_param(fan_max, uint, 0);
8f21d8e9 108MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)");
81474fc2 109
352f8f8b 110static int i8k_open_fs(struct inode *inode, struct file *file);
d79b6f4d 111static long i8k_ioctl(struct file *, unsigned int, unsigned long);
1da177e4 112
62322d25 113static const struct file_operations i8k_fops = {
1b502217 114 .owner = THIS_MODULE,
352f8f8b
DT		 115 .open = i8k_open_fs,
116 .read = seq_read,
117 .llseek = seq_lseek,
118 .release = single_release,
d79b6f4d 119 .unlocked_ioctl = i8k_ioctl,
1da177e4
LT		 120};
121
8378b924 122struct smm_regs {
dec63ec3 123 unsigned int eax;
12186f51
GR		 124 unsigned int ebx __packed;
125 unsigned int ecx __packed;
126 unsigned int edx __packed;
127 unsigned int esi __packed;
128 unsigned int edi __packed;
8378b924 129};
1da177e4 130
1855256c 131static inline const char *i8k_get_dmi_data(int field)
e70c9d5e 132{
1855256c 133 const char *dmi_data = dmi_get_system_info(field);
4f005551
DT		 134
135 return dmi_data && *dmi_data ? dmi_data : "?";
e70c9d5e 136}
1da177e4
LT		 137
138/*
139 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
140 */
8378b924 141static int i8k_smm(struct smm_regs *regs)
1da177e4 142{
dec63ec3
DT		 143 int rc;
144 int eax = regs->eax;
f36fdb9f
GR		 145 cpumask_var_t old_mask;
146
147 /* SMM requires CPU 0 */
148 if (!alloc_cpumask_var(&old_mask, GFP_KERNEL))
149 return -ENOMEM;
150 cpumask_copy(old_mask, &current->cpus_allowed);
6d827fbc
GR		 151 rc = set_cpus_allowed_ptr(current, cpumask_of(0));
152 if (rc)
153 goto out;
f36fdb9f
GR		 154 if (smp_processor_id() != 0) {
155 rc = -EBUSY;
156 goto out;
157 }
dec63ec3 158
fe04f22f 159#if defined(CONFIG_X86_64)
22d3243d 160 asm volatile("pushq %%rax\n\t"
fe04f22f
BS		 161 "movl 0(%%rax),%%edx\n\t"
162 "pushq %%rdx\n\t"
163 "movl 4(%%rax),%%ebx\n\t"
164 "movl 8(%%rax),%%ecx\n\t"
165 "movl 12(%%rax),%%edx\n\t"
166 "movl 16(%%rax),%%esi\n\t"
167 "movl 20(%%rax),%%edi\n\t"
168 "popq %%rax\n\t"
169 "out %%al,$0xb2\n\t"
170 "out %%al,$0x84\n\t"
171 "xchgq %%rax,(%%rsp)\n\t"
172 "movl %%ebx,4(%%rax)\n\t"
173 "movl %%ecx,8(%%rax)\n\t"
174 "movl %%edx,12(%%rax)\n\t"
175 "movl %%esi,16(%%rax)\n\t"
176 "movl %%edi,20(%%rax)\n\t"
177 "popq %%rdx\n\t"
178 "movl %%edx,0(%%rax)\n\t"
bc1f419c
LT		 179 "pushfq\n\t"
180 "popq %%rax\n\t"
fe04f22f 181 "andl $1,%%eax\n"
12186f51 182 : "=a"(rc)
fe04f22f
BS		 183 : "a"(regs)
184 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
185#else
22d3243d 186 asm volatile("pushl %%eax\n\t"
dec63ec3
DT		 187 "movl 0(%%eax),%%edx\n\t"
188 "push %%edx\n\t"
189 "movl 4(%%eax),%%ebx\n\t"
190 "movl 8(%%eax),%%ecx\n\t"
191 "movl 12(%%eax),%%edx\n\t"
192 "movl 16(%%eax),%%esi\n\t"
193 "movl 20(%%eax),%%edi\n\t"
194 "popl %%eax\n\t"
195 "out %%al,$0xb2\n\t"
196 "out %%al,$0x84\n\t"
197 "xchgl %%eax,(%%esp)\n\t"
198 "movl %%ebx,4(%%eax)\n\t"
199 "movl %%ecx,8(%%eax)\n\t"
200 "movl %%edx,12(%%eax)\n\t"
201 "movl %%esi,16(%%eax)\n\t"
202 "movl %%edi,20(%%eax)\n\t"
203 "popl %%edx\n\t"
204 "movl %%edx,0(%%eax)\n\t"
205 "lahf\n\t"
206 "shrl $8,%%eax\n\t"
6b4e81db 207 "andl $1,%%eax\n"
12186f51 208 : "=a"(rc)
dec63ec3
DT		 209 : "a"(regs)
210 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
fe04f22f 211#endif
8378b924 212 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
f36fdb9f 213 rc = -EINVAL;
dec63ec3 214
f36fdb9f
GR		 215out:
216 set_cpus_allowed_ptr(current, old_mask);
217 free_cpumask_var(old_mask);
218 return rc;
1da177e4
LT		 219}
220
1da177e4
LT		 221/*
222 * Read the Fn key status.
223 */
224static int i8k_get_fn_status(void)
225{
8378b924 226 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
dec63ec3
DT		 227 int rc;
228
12186f51
GR		 229 rc = i8k_smm(&regs);
230 if (rc < 0)
dec63ec3 231 return rc;
dec63ec3
DT		 232
233 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
234 case I8K_FN_UP:
235 return I8K_VOL_UP;
236 case I8K_FN_DOWN:
237 return I8K_VOL_DOWN;
238 case I8K_FN_MUTE:
239 return I8K_VOL_MUTE;
240 default:
241 return 0;
242 }
1da177e4
LT		 243}
244
245/*
246 * Read the power status.
247 */
248static int i8k_get_power_status(void)
249{
8378b924 250 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
dec63ec3
DT		 251 int rc;
252
12186f51
GR		 253 rc = i8k_smm(&regs);
254 if (rc < 0)
dec63ec3 255 return rc;
dec63ec3 256
8378b924 257 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
1da177e4
LT		 258}
259
260/*
261 * Read the fan status.
262 */
263static int i8k_get_fan_status(int fan)
264{
8378b924 265 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
1da177e4 266
dec63ec3 267 regs.ebx = fan & 0xff;
8378b924 268 return i8k_smm(&regs) ? : regs.eax & 0xff;
1da177e4
LT		 269}
270
271/*
272 * Read the fan speed in RPM.
273 */
274static int i8k_get_fan_speed(int fan)
275{
8378b924 276 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
1da177e4 277
dec63ec3 278 regs.ebx = fan & 0xff;
26d09382 279 return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
1da177e4
LT		 280}
281
f989e554
PR		 282/*
283 * Read the fan type.
284 */
285static int i8k_get_fan_type(int fan)
286{
287 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, };
288
289 regs.ebx = fan & 0xff;
290 return i8k_smm(&regs) ? : regs.eax & 0xff;
291}
292
8f21d8e9
PR		 293/*
294 * Read the fan nominal rpm for specific fan speed.
295 */
296static int i8k_get_fan_nominal_speed(int fan, int speed)
297{
298 struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, };
299
300 regs.ebx = (fan & 0xff) | (speed << 8);
301 return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
302}
303
1da177e4
LT		 304/*
305 * Set the fan speed (off, low, high). Returns the new fan status.
306 */
307static int i8k_set_fan(int fan, int speed)
308{
8378b924 309 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
1da177e4 310
81474fc2 311 speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed);
dec63ec3 312 regs.ebx = (fan & 0xff) | (speed << 8);
1da177e4 313
8378b924 314 return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
1da177e4
LT		 315}
316
5114b474
PR		 317static int i8k_get_temp_type(int sensor)
318{
319 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, };
320
321 regs.ebx = sensor & 0xff;
322 return i8k_smm(&regs) ? : regs.eax & 0xff;
323}
324
1da177e4
LT		 325/*
326 * Read the cpu temperature.
327 */
564132d9 328static int _i8k_get_temp(int sensor)
1da177e4 329{
564132d9
GR		 330 struct smm_regs regs = {
331 .eax = I8K_SMM_GET_TEMP,
332 .ebx = sensor & 0xff,
333 };
1da177e4 334
564132d9
GR		 335 return i8k_smm(&regs) ? : regs.eax & 0xff;
336}
8378b924 337
564132d9
GR		 338static int i8k_get_temp(int sensor)
339{
340 int temp = _i8k_get_temp(sensor);
1da177e4 341
dec63ec3
DT		 342 /*
343 * Sometimes the temperature sensor returns 0x99, which is out of range.
564132d9 344 * In this case we retry (once) before returning an error.
dec63ec3
DT		 345 # 1003655137 00000058 00005a4b
346 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
347 # 1003655139 00000054 00005c52
348 */
564132d9
GR		 349 if (temp == 0x99) {
350 msleep(100);
351 temp = _i8k_get_temp(sensor);
dec63ec3 352 }
564132d9
GR		 353 /*
354 * Return -ENODATA for all invalid temperatures.
355 *
356 * Known instances are the 0x99 value as seen above as well as
357 * 0xc1 (193), which may be returned when trying to read the GPU
358 * temperature if the system supports a GPU and it is currently
359 * turned off.
360 */
723493ca 361 if (temp > I8K_MAX_TEMP)
83d514d7 362 return -ENODATA;
1da177e4 363
dec63ec3 364 return temp;
1da177e4
LT		 365}
366
7e0fa31d 367static int i8k_get_dell_signature(int req_fn)
1da177e4 368{
7e0fa31d 369 struct smm_regs regs = { .eax = req_fn, };
dec63ec3 370 int rc;
1da177e4 371
12186f51
GR		 372 rc = i8k_smm(&regs);
373 if (rc < 0)
dec63ec3 374 return rc;
1da177e4 375
8378b924 376 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
1da177e4
LT		 377}
378
d79b6f4d
FW		 379static int
380i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
1da177e4 381{
e70c9d5e 382 int val = 0;
dec63ec3
DT		 383 int speed;
384 unsigned char buff[16];
385 int __user *argp = (int __user *)arg;
386
387 if (!argp)
388 return -EINVAL;
389
390 switch (cmd) {
391 case I8K_BIOS_VERSION:
e551b152
GR		 392 val = (bios_version[0] << 16) |
393 (bios_version[1] << 8) | bios_version[2];
dec63ec3
DT		 394 break;
395
396 case I8K_MACHINE_ID:
397 memset(buff, 0, 16);
12186f51
GR		 398 strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
399 sizeof(buff));
dec63ec3
DT		 400 break;
401
402 case I8K_FN_STATUS:
403 val = i8k_get_fn_status();
404 break;
405
406 case I8K_POWER_STATUS:
407 val = i8k_get_power_status();
408 break;
409
410 case I8K_GET_TEMP:
7e0fa31d 411 val = i8k_get_temp(0);
dec63ec3
DT		 412 break;
413
414 case I8K_GET_SPEED:
8378b924 415 if (copy_from_user(&val, argp, sizeof(int)))
dec63ec3 416 return -EFAULT;
8378b924 417
dec63ec3
DT		 418 val = i8k_get_fan_speed(val);
419 break;
1da177e4 420
dec63ec3 421 case I8K_GET_FAN:
8378b924 422 if (copy_from_user(&val, argp, sizeof(int)))
dec63ec3 423 return -EFAULT;
8378b924 424
dec63ec3
DT		 425 val = i8k_get_fan_status(val);
426 break;
1da177e4 427
dec63ec3 428 case I8K_SET_FAN:
8378b924 429 if (restricted && !capable(CAP_SYS_ADMIN))
dec63ec3 430 return -EPERM;
8378b924
DT		 431
432 if (copy_from_user(&val, argp, sizeof(int)))
dec63ec3 433 return -EFAULT;
8378b924
DT		 434
435 if (copy_from_user(&speed, argp + 1, sizeof(int)))
dec63ec3 436 return -EFAULT;
8378b924 437
dec63ec3
DT		 438 val = i8k_set_fan(val, speed);
439 break;
1da177e4 440
dec63ec3
DT		 441 default:
442 return -EINVAL;
1da177e4 443 }
1da177e4 444
8378b924 445 if (val < 0)
dec63ec3 446 return val;
1da177e4 447
dec63ec3
DT		 448 switch (cmd) {
449 case I8K_BIOS_VERSION:
8378b924 450 if (copy_to_user(argp, &val, 4))
dec63ec3 451 return -EFAULT;
8378b924 452
dec63ec3
DT		 453 break;
454 case I8K_MACHINE_ID:
8378b924 455 if (copy_to_user(argp, buff, 16))
dec63ec3 456 return -EFAULT;
8378b924 457
dec63ec3
DT		 458 break;
459 default:
8378b924 460 if (copy_to_user(argp, &val, sizeof(int)))
dec63ec3 461 return -EFAULT;
8378b924 462
dec63ec3 463 break;
1da177e4 464 }
1da177e4 465
dec63ec3 466 return 0;
1da177e4
LT		 467}
468
d79b6f4d
FW		 469static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
470{
471 long ret;
472
613655fa 473 mutex_lock(&i8k_mutex);
d79b6f4d 474 ret = i8k_ioctl_unlocked(fp, cmd, arg);
613655fa 475 mutex_unlock(&i8k_mutex);
d79b6f4d
FW		 476
477 return ret;
478}
479
1da177e4
LT		 480/*
481 * Print the information for /proc/i8k.
482 */
352f8f8b 483static int i8k_proc_show(struct seq_file *seq, void *offset)
1da177e4 484{
352f8f8b 485 int fn_key, cpu_temp, ac_power;
dec63ec3
DT		 486 int left_fan, right_fan, left_speed, right_speed;
487
96de0e25
JE		 488 cpu_temp = i8k_get_temp(0); /* 11100 µs */
489 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */
490 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */
491 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */
492 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */
493 fn_key = i8k_get_fn_status(); /* 750 µs */
8378b924 494 if (power_status)
96de0e25 495 ac_power = i8k_get_power_status(); /* 14700 µs */
8378b924 496 else
dec63ec3 497 ac_power = -1;
dec63ec3
DT		 498
499 /*
500 * Info:
501 *
502 * 1) Format version (this will change if format changes)
503 * 2) BIOS version
504 * 3) BIOS machine ID
505 * 4) Cpu temperature
506 * 5) Left fan status
507 * 6) Right fan status
508 * 7) Left fan speed
509 * 8) Right fan speed
510 * 9) AC power
511 * 10) Fn Key status
512 */
3a267d3b
JP		 513 seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
514 I8K_PROC_FMT,
515 bios_version,
516 i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
517 cpu_temp,
518 left_fan, right_fan, left_speed, right_speed,
519 ac_power, fn_key);
520
521 return 0;
1da177e4
LT		 522}
523
352f8f8b 524static int i8k_open_fs(struct inode *inode, struct file *file)
1da177e4 525{
352f8f8b 526 return single_open(file, i8k_proc_show, NULL);
1da177e4
LT		 527}
528
949a9d70
JD		 529
530/*
531 * Hwmon interface
532 */
533
5114b474
PR		 534static ssize_t i8k_hwmon_show_temp_label(struct device *dev,
535 struct device_attribute *devattr,
536 char *buf)
537{
538 static const char * const labels[] = {
539 "CPU",
540 "GPU",
541 "SODIMM",
542 "Other",
543 "Ambient",
544 "Other",
545 };
546 int index = to_sensor_dev_attr(devattr)->index;
547 int type;
548
549 type = i8k_get_temp_type(index);
550 if (type < 0)
551 return type;
552 if (type >= ARRAY_SIZE(labels))
553 type = ARRAY_SIZE(labels) - 1;
554 return sprintf(buf, "%s\n", labels[type]);
555}
556
949a9d70
JD		 557static ssize_t i8k_hwmon_show_temp(struct device *dev,
558 struct device_attribute *devattr,
559 char *buf)
560{
d83c39de
GR		 561 int index = to_sensor_dev_attr(devattr)->index;
562 int temp;
949a9d70 563
d83c39de
GR		 564 temp = i8k_get_temp(index);
565 if (temp < 0)
566 return temp;
567 return sprintf(buf, "%d\n", temp * 1000);
949a9d70
JD		 568}
569
f989e554
PR		 570static ssize_t i8k_hwmon_show_fan_label(struct device *dev,
571 struct device_attribute *devattr,
572 char *buf)
573{
574 static const char * const labels[] = {
575 "Processor Fan",
576 "Motherboard Fan",
577 "Video Fan",
578 "Power Supply Fan",
579 "Chipset Fan",
580 "Other Fan",
581 };
582 int index = to_sensor_dev_attr(devattr)->index;
583 bool dock = false;
584 int type;
585
586 type = i8k_get_fan_type(index);
587 if (type < 0)
588 return type;
589
590 if (type & 0x10) {
591 dock = true;
592 type &= 0x0F;
593 }
594
595 if (type >= ARRAY_SIZE(labels))
596 type = (ARRAY_SIZE(labels) - 1);
597
598 return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]);
599}
600
949a9d70
JD		 601static ssize_t i8k_hwmon_show_fan(struct device *dev,
602 struct device_attribute *devattr,
603 char *buf)
604{
605 int index = to_sensor_dev_attr(devattr)->index;
606 int fan_speed;
607
608 fan_speed = i8k_get_fan_speed(index);
609 if (fan_speed < 0)
610 return fan_speed;
611 return sprintf(buf, "%d\n", fan_speed);
612}
613
e7f5f275
GR		 614static ssize_t i8k_hwmon_show_pwm(struct device *dev,
615 struct device_attribute *devattr,
616 char *buf)
617{
618 int index = to_sensor_dev_attr(devattr)->index;
619 int status;
620
621 status = i8k_get_fan_status(index);
622 if (status < 0)
623 return -EIO;
81474fc2 624 return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255));
e7f5f275
GR		 625}
626
627static ssize_t i8k_hwmon_set_pwm(struct device *dev,
628 struct device_attribute *attr,
629 const char *buf, size_t count)
630{
631 int index = to_sensor_dev_attr(attr)->index;
632 unsigned long val;
633 int err;
634
635 err = kstrtoul(buf, 10, &val);
636 if (err)
637 return err;
81474fc2 638 val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max);
e7f5f275
GR		 639
640 mutex_lock(&i8k_mutex);
641 err = i8k_set_fan(index, val);
642 mutex_unlock(&i8k_mutex);
643
644 return err < 0 ? -EIO : count;
645}
646
d83c39de 647static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0);
5114b474
PR		 648static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
649 0);
d83c39de 650static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1);
5114b474
PR		 651static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
652 1);
d83c39de 653static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2);
5114b474
PR		 654static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
655 2);
d83c39de 656static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3);
5114b474
PR		 657static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
658 3);
f989e554
PR		 659static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 0);
660static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
661 0);
e7f5f275 662static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
f989e554 663 i8k_hwmon_set_pwm, 0);
949a9d70 664static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
f989e554
PR		 665 1);
666static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
667 1);
e7f5f275 668static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
f989e554 669 i8k_hwmon_set_pwm, 1);
82ba1d3f
GR		 670
671static struct attribute *i8k_attrs[] = {
d83c39de 672 &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */
5114b474
PR		 673 &sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */
674 &sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */
675 &sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */
676 &sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */
677 &sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */
678 &sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */
679 &sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */
680 &sensor_dev_attr_fan1_input.dev_attr.attr, /* 8 */
f989e554
PR		 681 &sensor_dev_attr_fan1_label.dev_attr.attr, /* 9 */
682 &sensor_dev_attr_pwm1.dev_attr.attr, /* 10 */
683 &sensor_dev_attr_fan2_input.dev_attr.attr, /* 11 */
684 &sensor_dev_attr_fan2_label.dev_attr.attr, /* 12 */
685 &sensor_dev_attr_pwm2.dev_attr.attr, /* 13 */
82ba1d3f
GR		 686 NULL
687};
949a9d70 688
82ba1d3f
GR		 689static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
690 int index)
949a9d70 691{
5114b474
PR		 692 if (index >= 0 && index <= 1 &&
693 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
82ba1d3f 694 return 0;
5114b474
PR		 695 if (index >= 2 && index <= 3 &&
696 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
d83c39de 697 return 0;
5114b474
PR		 698 if (index >= 4 && index <= 5 &&
699 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
d83c39de 700 return 0;
5114b474
PR		 701 if (index >= 6 && index <= 7 &&
702 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
d83c39de 703 return 0;
f989e554 704 if (index >= 8 && index <= 10 &&
82ba1d3f
GR		 705 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
706 return 0;
f989e554 707 if (index >= 11 && index <= 13 &&
82ba1d3f
GR		 708 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
709 return 0;
710
711 return attr->mode;
949a9d70
JD		 712}
713
82ba1d3f
GR		 714static const struct attribute_group i8k_group = {
715 .attrs = i8k_attrs,
716 .is_visible = i8k_is_visible,
717};
718__ATTRIBUTE_GROUPS(i8k);
719
949a9d70
JD		 720static int __init i8k_init_hwmon(void)
721{
722 int err;
723
82ba1d3f 724 i8k_hwmon_flags = 0;
949a9d70 725
672af223
PR		 726 /* CPU temperature attributes, if temperature type is OK */
727 err = i8k_get_temp_type(0);
728 if (err >= 0)
82ba1d3f 729 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1;
d83c39de 730 /* check for additional temperature sensors */
672af223
PR		 731 err = i8k_get_temp_type(1);
732 if (err >= 0)
d83c39de 733 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2;
672af223
PR		 734 err = i8k_get_temp_type(2);
735 if (err >= 0)
d83c39de 736 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3;
672af223
PR		 737 err = i8k_get_temp_type(3);
738 if (err >= 0)
d83c39de 739 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
949a9d70 740
f989e554
PR		 741 /* First fan attributes, if fan type is OK */
742 err = i8k_get_fan_type(0);
82ba1d3f
GR		 743 if (err >= 0)
744 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
949a9d70 745
f989e554
PR		 746 /* Second fan attributes, if fan type is OK */
747 err = i8k_get_fan_type(1);
82ba1d3f
GR		 748 if (err >= 0)
749 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
949a9d70 750
82ba1d3f
GR		 751 i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "i8k", NULL,
752 i8k_groups);
753 if (IS_ERR(i8k_hwmon_dev)) {
754 err = PTR_ERR(i8k_hwmon_dev);
755 i8k_hwmon_dev = NULL;
756 pr_err("hwmon registration failed (%d)\n", err);
757 return err;
758 }
949a9d70 759 return 0;
949a9d70
JD		 760}
761
81474fc2 762struct i8k_config_data {
7f69fb03
PR		 763 uint fan_mult;
764 uint fan_max;
81474fc2
GR		 765};
766
767enum i8k_configs {
7b883446
GR		 768 DELL_LATITUDE_D520,
769 DELL_PRECISION_490,
81474fc2 770 DELL_STUDIO,
34ae40f6 771 DELL_XPS,
81474fc2
GR		 772};
773
774static const struct i8k_config_data i8k_config_data[] = {
7b883446
GR		 775 [DELL_LATITUDE_D520] = {
776 .fan_mult = 1,
777 .fan_max = I8K_FAN_TURBO,
778 },
779 [DELL_PRECISION_490] = {
780 .fan_mult = 1,
781 .fan_max = I8K_FAN_TURBO,
782 },
81474fc2
GR		 783 [DELL_STUDIO] = {
784 .fan_mult = 1,
785 .fan_max = I8K_FAN_HIGH,
786 },
34ae40f6 787 [DELL_XPS] = {
81474fc2
GR		 788 .fan_mult = 1,
789 .fan_max = I8K_FAN_HIGH,
790 },
791};
792
12186f51 793static struct dmi_system_id i8k_dmi_table[] __initdata = {
e70c9d5e
DT		 794 {
795 .ident = "Dell Inspiron",
796 .matches = {
797 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
798 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
799 },
800 },
801 {
802 .ident = "Dell Latitude",
803 .matches = {
804 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
805 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
806 },
807 },
7e0fa31d
DT		 808 {
809 .ident = "Dell Inspiron 2",
810 .matches = {
811 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
812 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
813 },
814 },
7b883446
GR		 815 {
816 .ident = "Dell Latitude D520",
817 .matches = {
818 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
819 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"),
820 },
821 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520],
822 },
7e0fa31d
DT		 823 {
824 .ident = "Dell Latitude 2",
825 .matches = {
826 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
827 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
828 },
829 },
a9000d03
NW		 830 { /* UK Inspiron 6400 */
831 .ident = "Dell Inspiron 3",
832 .matches = {
833 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
834 DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
835 },
836 },
48103c52
FS		 837 {
838 .ident = "Dell Inspiron 3",
839 .matches = {
840 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
841 DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
842 },
843 },
7b883446
GR		 844 {
845 .ident = "Dell Precision 490",
846 .matches = {
847 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
848 DMI_MATCH(DMI_PRODUCT_NAME,
849 "Precision WorkStation 490"),
850 },
851 .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490],
852 },
7ab21a86
AS		 853 {
854 .ident = "Dell Precision",
855 .matches = {
856 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
857 DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
858 },
859 },
bef2a508
FH		 860 {
861 .ident = "Dell Vostro",
862 .matches = {
863 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
864 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
865 },
866 },
9aa5b018
AC		 867 {
868 .ident = "Dell XPS421",
869 .matches = {
870 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
871 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
872 },
873 },
ff457bde
GR		 874 {
875 .ident = "Dell Studio",
876 .matches = {
877 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
878 DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
879 },
81474fc2 880 .driver_data = (void *)&i8k_config_data[DELL_STUDIO],
ff457bde 881 },
34ae40f6
GR		 882 {
883 .ident = "Dell XPS 13",
884 .matches = {
885 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
886 DMI_MATCH(DMI_PRODUCT_NAME, "XPS13"),
887 },
888 .driver_data = (void *)&i8k_config_data[DELL_XPS],
889 },
919a0304
GR		 890 {
891 .ident = "Dell XPS M140",
892 .matches = {
893 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
894 DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
895 },
34ae40f6 896 .driver_data = (void *)&i8k_config_data[DELL_XPS],
919a0304 897 },
12186f51 898 { }
e70c9d5e 899};
1da177e4 900
148b1fda
PR		 901MODULE_DEVICE_TABLE(dmi, i8k_dmi_table);
902
1da177e4
LT		 903/*
904 * Probe for the presence of a supported laptop.
905 */
906static int __init i8k_probe(void)
907{
26d09382 908 const struct dmi_system_id *id;
8f21d8e9 909 int fan, ret;
dec63ec3 910
1da177e4 911 /*
dec63ec3 912 * Get DMI information
1da177e4 913 */
e70c9d5e
DT		 914 if (!dmi_check_system(i8k_dmi_table)) {
915 if (!ignore_dmi && !force)
916 return -ENODEV;
917
60e71aaf
GR		 918 pr_info("not running on a supported Dell system.\n");
919 pr_info("vendor=%s, model=%s, version=%s\n",
e70c9d5e
DT		 920 i8k_get_dmi_data(DMI_SYS_VENDOR),
921 i8k_get_dmi_data(DMI_PRODUCT_NAME),
922 i8k_get_dmi_data(DMI_BIOS_VERSION));
1da177e4 923 }
dec63ec3 924
12186f51
GR		 925 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
926 sizeof(bios_version));
e70c9d5e 927
1da177e4 928 /*
dec63ec3 929 * Get SMM Dell signature
1da177e4 930 */
7e0fa31d
DT		 931 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
932 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
60e71aaf 933 pr_err("unable to get SMM Dell signature\n");
e70c9d5e
DT		 934 if (!force)
935 return -ENODEV;
1da177e4 936 }
1da177e4 937
8f21d8e9
PR		 938 /*
939 * Set fan multiplier and maximal fan speed from dmi config
940 * Values specified in module parameters override values from dmi
941 */
26d09382 942 id = dmi_first_match(i8k_dmi_table);
81474fc2
GR		 943 if (id && id->driver_data) {
944 const struct i8k_config_data *conf = id->driver_data;
8f21d8e9
PR		 945 if (!fan_mult && conf->fan_mult)
946 fan_mult = conf->fan_mult;
947 if (!fan_max && conf->fan_max)
948 fan_max = conf->fan_max;
81474fc2 949 }
8f21d8e9
PR		 950
951 i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */
81474fc2 952 i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);
26d09382 953
8f21d8e9
PR		 954 if (!fan_mult) {
955 /*
956 * Autodetect fan multiplier based on nominal rpm
957 * If fan reports rpm value too high then set multiplier to 1
958 */
959 for (fan = 0; fan < 2; ++fan) {
960 ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max);
961 if (ret < 0)
962 continue;
963 if (ret > I8K_FAN_MAX_RPM)
964 i8k_fan_mult = 1;
965 break;
966 }
967 } else {
968 /* Fan multiplier was specified in module param or in dmi */
969 i8k_fan_mult = fan_mult;
970 }
971
dec63ec3 972 return 0;
1da177e4
LT		 973}
974
8378b924 975static int __init i8k_init(void)
1da177e4 976{
dec63ec3 977 struct proc_dir_entry *proc_i8k;
949a9d70 978 int err;
dec63ec3
DT		 979
980 /* Are we running on an supported laptop? */
e70c9d5e 981 if (i8k_probe())
dec63ec3 982 return -ENODEV;
dec63ec3
DT		 983
984 /* Register the proc entry */
1b502217 985 proc_i8k = proc_create("i8k", 0, NULL, &i8k_fops);
352f8f8b 986 if (!proc_i8k)
dec63ec3 987 return -ENOENT;
352f8f8b 988
949a9d70
JD		 989 err = i8k_init_hwmon();
990 if (err)
991 goto exit_remove_proc;
992
dec63ec3 993 return 0;
949a9d70
JD		 994
995 exit_remove_proc:
996 remove_proc_entry("i8k", NULL);
997 return err;
1da177e4
LT		 998}
999
8378b924 1000static void __exit i8k_exit(void)
1da177e4 1001{
82ba1d3f 1002 hwmon_device_unregister(i8k_hwmon_dev);
dec63ec3 1003 remove_proc_entry("i8k", NULL);
1da177e4 1004}
1da177e4 1005
8378b924
DT		 1006module_init(i8k_init);
1007module_exit(i8k_exit);
Linux kernel - Deliverables
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