1 /*
2 * i8k.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
3 *
4 * Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org>
5 *
6 * Hwmon integration:
7 * Copyright (C) 2011 Jean Delvare <jdelvare@suse.de>
8 * Copyright (C) 2013, 2014 Guenter Roeck <linux@roeck-us.net>
9 * Copyright (C) 2014 Pali Rohár <pali.rohar@gmail.com>
10 *
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2, or (at your option) any
14 * later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 */
21
22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
24 #include <linux/delay.h>
25 #include <linux/module.h>
26 #include <linux/types.h>
27 #include <linux/init.h>
28 #include <linux/proc_fs.h>
29 #include <linux/seq_file.h>
30 #include <linux/dmi.h>
31 #include <linux/capability.h>
32 #include <linux/mutex.h>
33 #include <linux/hwmon.h>
34 #include <linux/hwmon-sysfs.h>
35 #include <linux/uaccess.h>
36 #include <linux/io.h>
37 #include <linux/sched.h>
38
39 #include <linux/i8k.h>
40
41 #define I8K_SMM_FN_STATUS 0x0025
42 #define I8K_SMM_POWER_STATUS 0x0069
43 #define I8K_SMM_SET_FAN 0x01a3
44 #define I8K_SMM_GET_FAN 0x00a3
45 #define I8K_SMM_GET_SPEED 0x02a3
46 #define I8K_SMM_GET_FAN_TYPE 0x03a3
47 #define I8K_SMM_GET_NOM_SPEED 0x04a3
48 #define I8K_SMM_GET_TEMP 0x10a3
49 #define I8K_SMM_GET_TEMP_TYPE 0x11a3
50 #define I8K_SMM_GET_DELL_SIG1 0xfea3
51 #define I8K_SMM_GET_DELL_SIG2 0xffa3
52
53 #define I8K_FAN_MULT 30
54 #define I8K_FAN_MAX_RPM 30000
55 #define I8K_MAX_TEMP 127
56
57 #define I8K_FN_NONE 0x00
58 #define I8K_FN_UP 0x01
59 #define I8K_FN_DOWN 0x02
60 #define I8K_FN_MUTE 0x04
61 #define I8K_FN_MASK 0x07
62 #define I8K_FN_SHIFT 8
63
64 #define I8K_POWER_AC 0x05
65 #define I8K_POWER_BATTERY 0x01
66
67 static DEFINE_MUTEX(i8k_mutex);
68 static char bios_version[4];
69 static struct device *i8k_hwmon_dev;
70 static u32 i8k_hwmon_flags;
71 static uint i8k_fan_mult = I8K_FAN_MULT;
72 static uint i8k_pwm_mult;
73 static uint i8k_fan_max = I8K_FAN_HIGH;
74
75 #define I8K_HWMON_HAVE_TEMP1 (1 << 0)
76 #define I8K_HWMON_HAVE_TEMP2 (1 << 1)
77 #define I8K_HWMON_HAVE_TEMP3 (1 << 2)
78 #define I8K_HWMON_HAVE_TEMP4 (1 << 3)
79 #define I8K_HWMON_HAVE_FAN1 (1 << 4)
80 #define I8K_HWMON_HAVE_FAN2 (1 << 5)
81
82 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
83 MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
84 MODULE_LICENSE("GPL");
85
86 static bool force;
87 module_param(force, bool, 0);
88 MODULE_PARM_DESC(force, "Force loading without checking for supported models");
89
90 static bool ignore_dmi;
91 module_param(ignore_dmi, bool, 0);
92 MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
93
94 static bool restricted;
95 module_param(restricted, bool, 0);
96 MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
97
98 static bool power_status;
99 module_param(power_status, bool, 0600);
100 MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
101
102 static uint fan_mult;
103 module_param(fan_mult, uint, 0);
104 MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)");
105
106 static uint fan_max;
107 module_param(fan_max, uint, 0);
108 MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)");
109
110 static int i8k_open_fs(struct inode *inode, struct file *file);
111 static long i8k_ioctl(struct file *, unsigned int, unsigned long);
112
113 static const struct file_operations i8k_fops = {
114 .owner = THIS_MODULE,
115 .open = i8k_open_fs,
116 .read = seq_read,
117 .llseek = seq_lseek,
118 .release = single_release,
119 .unlocked_ioctl = i8k_ioctl,
120 };
121
122 struct smm_regs {
123 unsigned int eax;
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;
129 };
130
i8k_get_dmi_data(int field)131 static inline const char *i8k_get_dmi_data(int field)
132 {
133 const char *dmi_data = dmi_get_system_info(field);
134
135 return dmi_data && *dmi_data ? dmi_data : "?";
136 }
137
138 /*
139 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
140 */
i8k_smm(struct smm_regs * regs)141 static int i8k_smm(struct smm_regs *regs)
142 {
143 int rc;
144 int eax = regs->eax;
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, ¤t->cpus_allowed);
151 rc = set_cpus_allowed_ptr(current, cpumask_of(0));
152 if (rc)
153 goto out;
154 if (smp_processor_id() != 0) {
155 rc = -EBUSY;
156 goto out;
157 }
158
159 #if defined(CONFIG_X86_64)
160 asm volatile("pushq %%rax\n\t"
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"
179 "pushfq\n\t"
180 "popq %%rax\n\t"
181 "andl $1,%%eax\n"
182 : "=a"(rc)
183 : "a"(regs)
184 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
185 #else
186 asm volatile("pushl %%eax\n\t"
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"
207 "andl $1,%%eax\n"
208 : "=a"(rc)
209 : "a"(regs)
210 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
211 #endif
212 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
213 rc = -EINVAL;
214
215 out:
216 set_cpus_allowed_ptr(current, old_mask);
217 free_cpumask_var(old_mask);
218 return rc;
219 }
220
221 /*
222 * Read the Fn key status.
223 */
i8k_get_fn_status(void)224 static int i8k_get_fn_status(void)
225 {
226 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
227 int rc;
228
229 rc = i8k_smm(®s);
230 if (rc < 0)
231 return rc;
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 }
243 }
244
245 /*
246 * Read the power status.
247 */
i8k_get_power_status(void)248 static int i8k_get_power_status(void)
249 {
250 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
251 int rc;
252
253 rc = i8k_smm(®s);
254 if (rc < 0)
255 return rc;
256
257 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
258 }
259
260 /*
261 * Read the fan status.
262 */
i8k_get_fan_status(int fan)263 static int i8k_get_fan_status(int fan)
264 {
265 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
266
267 regs.ebx = fan & 0xff;
268 return i8k_smm(®s) ? : regs.eax & 0xff;
269 }
270
271 /*
272 * Read the fan speed in RPM.
273 */
i8k_get_fan_speed(int fan)274 static int i8k_get_fan_speed(int fan)
275 {
276 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
277
278 regs.ebx = fan & 0xff;
279 return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult;
280 }
281
282 /*
283 * Read the fan type.
284 */
i8k_get_fan_type(int fan)285 static 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(®s) ? : regs.eax & 0xff;
291 }
292
293 /*
294 * Read the fan nominal rpm for specific fan speed.
295 */
i8k_get_fan_nominal_speed(int fan,int speed)296 static 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(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult;
302 }
303
304 /*
305 * Set the fan speed (off, low, high). Returns the new fan status.
306 */
i8k_set_fan(int fan,int speed)307 static int i8k_set_fan(int fan, int speed)
308 {
309 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
310
311 speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed);
312 regs.ebx = (fan & 0xff) | (speed << 8);
313
314 return i8k_smm(®s) ? : i8k_get_fan_status(fan);
315 }
316
i8k_get_temp_type(int sensor)317 static 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(®s) ? : regs.eax & 0xff;
323 }
324
325 /*
326 * Read the cpu temperature.
327 */
_i8k_get_temp(int sensor)328 static int _i8k_get_temp(int sensor)
329 {
330 struct smm_regs regs = {
331 .eax = I8K_SMM_GET_TEMP,
332 .ebx = sensor & 0xff,
333 };
334
335 return i8k_smm(®s) ? : regs.eax & 0xff;
336 }
337
i8k_get_temp(int sensor)338 static int i8k_get_temp(int sensor)
339 {
340 int temp = _i8k_get_temp(sensor);
341
342 /*
343 * Sometimes the temperature sensor returns 0x99, which is out of range.
344 * In this case we retry (once) before returning an error.
345 # 1003655137 00000058 00005a4b
346 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
347 # 1003655139 00000054 00005c52
348 */
349 if (temp == 0x99) {
350 msleep(100);
351 temp = _i8k_get_temp(sensor);
352 }
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 */
361 if (temp > I8K_MAX_TEMP)
362 return -ENODATA;
363
364 return temp;
365 }
366
i8k_get_dell_signature(int req_fn)367 static int i8k_get_dell_signature(int req_fn)
368 {
369 struct smm_regs regs = { .eax = req_fn, };
370 int rc;
371
372 rc = i8k_smm(®s);
373 if (rc < 0)
374 return rc;
375
376 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
377 }
378
379 static int
i8k_ioctl_unlocked(struct file * fp,unsigned int cmd,unsigned long arg)380 i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
381 {
382 int val = 0;
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:
392 val = (bios_version[0] << 16) |
393 (bios_version[1] << 8) | bios_version[2];
394 break;
395
396 case I8K_MACHINE_ID:
397 memset(buff, 0, 16);
398 strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
399 sizeof(buff));
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:
411 val = i8k_get_temp(0);
412 break;
413
414 case I8K_GET_SPEED:
415 if (copy_from_user(&val, argp, sizeof(int)))
416 return -EFAULT;
417
418 val = i8k_get_fan_speed(val);
419 break;
420
421 case I8K_GET_FAN:
422 if (copy_from_user(&val, argp, sizeof(int)))
423 return -EFAULT;
424
425 val = i8k_get_fan_status(val);
426 break;
427
428 case I8K_SET_FAN:
429 if (restricted && !capable(CAP_SYS_ADMIN))
430 return -EPERM;
431
432 if (copy_from_user(&val, argp, sizeof(int)))
433 return -EFAULT;
434
435 if (copy_from_user(&speed, argp + 1, sizeof(int)))
436 return -EFAULT;
437
438 val = i8k_set_fan(val, speed);
439 break;
440
441 default:
442 return -EINVAL;
443 }
444
445 if (val < 0)
446 return val;
447
448 switch (cmd) {
449 case I8K_BIOS_VERSION:
450 if (copy_to_user(argp, &val, 4))
451 return -EFAULT;
452
453 break;
454 case I8K_MACHINE_ID:
455 if (copy_to_user(argp, buff, 16))
456 return -EFAULT;
457
458 break;
459 default:
460 if (copy_to_user(argp, &val, sizeof(int)))
461 return -EFAULT;
462
463 break;
464 }
465
466 return 0;
467 }
468
i8k_ioctl(struct file * fp,unsigned int cmd,unsigned long arg)469 static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
470 {
471 long ret;
472
473 mutex_lock(&i8k_mutex);
474 ret = i8k_ioctl_unlocked(fp, cmd, arg);
475 mutex_unlock(&i8k_mutex);
476
477 return ret;
478 }
479
480 /*
481 * Print the information for /proc/i8k.
482 */
i8k_proc_show(struct seq_file * seq,void * offset)483 static int i8k_proc_show(struct seq_file *seq, void *offset)
484 {
485 int fn_key, cpu_temp, ac_power;
486 int left_fan, right_fan, left_speed, right_speed;
487
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 */
494 if (power_status)
495 ac_power = i8k_get_power_status(); /* 14700 µs */
496 else
497 ac_power = -1;
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 */
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;
522 }
523
i8k_open_fs(struct inode * inode,struct file * file)524 static int i8k_open_fs(struct inode *inode, struct file *file)
525 {
526 return single_open(file, i8k_proc_show, NULL);
527 }
528
529
530 /*
531 * Hwmon interface
532 */
533
i8k_hwmon_show_temp_label(struct device * dev,struct device_attribute * devattr,char * buf)534 static 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
i8k_hwmon_show_temp(struct device * dev,struct device_attribute * devattr,char * buf)557 static ssize_t i8k_hwmon_show_temp(struct device *dev,
558 struct device_attribute *devattr,
559 char *buf)
560 {
561 int index = to_sensor_dev_attr(devattr)->index;
562 int temp;
563
564 temp = i8k_get_temp(index);
565 if (temp < 0)
566 return temp;
567 return sprintf(buf, "%d\n", temp * 1000);
568 }
569
i8k_hwmon_show_fan_label(struct device * dev,struct device_attribute * devattr,char * buf)570 static 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
i8k_hwmon_show_fan(struct device * dev,struct device_attribute * devattr,char * buf)601 static 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
i8k_hwmon_show_pwm(struct device * dev,struct device_attribute * devattr,char * buf)614 static 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;
624 return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255));
625 }
626
i8k_hwmon_set_pwm(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)627 static 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;
638 val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max);
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
647 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0);
648 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
649 0);
650 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1);
651 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
652 1);
653 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2);
654 static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
655 2);
656 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3);
657 static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
658 3);
659 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 0);
660 static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
661 0);
662 static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
663 i8k_hwmon_set_pwm, 0);
664 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
665 1);
666 static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
667 1);
668 static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
669 i8k_hwmon_set_pwm, 1);
670
671 static struct attribute *i8k_attrs[] = {
672 &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */
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 */
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 */
686 NULL
687 };
688
i8k_is_visible(struct kobject * kobj,struct attribute * attr,int index)689 static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
690 int index)
691 {
692 if (index >= 0 && index <= 1 &&
693 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
694 return 0;
695 if (index >= 2 && index <= 3 &&
696 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
697 return 0;
698 if (index >= 4 && index <= 5 &&
699 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
700 return 0;
701 if (index >= 6 && index <= 7 &&
702 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
703 return 0;
704 if (index >= 8 && index <= 10 &&
705 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
706 return 0;
707 if (index >= 11 && index <= 13 &&
708 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
709 return 0;
710
711 return attr->mode;
712 }
713
714 static const struct attribute_group i8k_group = {
715 .attrs = i8k_attrs,
716 .is_visible = i8k_is_visible,
717 };
718 __ATTRIBUTE_GROUPS(i8k);
719
i8k_init_hwmon(void)720 static int __init i8k_init_hwmon(void)
721 {
722 int err;
723
724 i8k_hwmon_flags = 0;
725
726 /* CPU temperature attributes, if temperature type is OK */
727 err = i8k_get_temp_type(0);
728 if (err >= 0)
729 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1;
730 /* check for additional temperature sensors */
731 err = i8k_get_temp_type(1);
732 if (err >= 0)
733 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2;
734 err = i8k_get_temp_type(2);
735 if (err >= 0)
736 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3;
737 err = i8k_get_temp_type(3);
738 if (err >= 0)
739 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
740
741 /* First fan attributes, if fan type is OK */
742 err = i8k_get_fan_type(0);
743 if (err >= 0)
744 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
745
746 /* Second fan attributes, if fan type is OK */
747 err = i8k_get_fan_type(1);
748 if (err >= 0)
749 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
750
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 }
759 return 0;
760 }
761
762 struct i8k_config_data {
763 uint fan_mult;
764 uint fan_max;
765 };
766
767 enum i8k_configs {
768 DELL_LATITUDE_D520,
769 DELL_PRECISION_490,
770 DELL_STUDIO,
771 DELL_XPS,
772 };
773
774 static const struct i8k_config_data i8k_config_data[] = {
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 },
783 [DELL_STUDIO] = {
784 .fan_mult = 1,
785 .fan_max = I8K_FAN_HIGH,
786 },
787 [DELL_XPS] = {
788 .fan_mult = 1,
789 .fan_max = I8K_FAN_HIGH,
790 },
791 };
792
793 static struct dmi_system_id i8k_dmi_table[] __initdata = {
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 },
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 },
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 },
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 },
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 },
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 },
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 },
853 {
854 .ident = "Dell Precision",
855 .matches = {
856 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
857 DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
858 },
859 },
860 {
861 .ident = "Dell Vostro",
862 .matches = {
863 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
864 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
865 },
866 },
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 },
874 {
875 .ident = "Dell Studio",
876 .matches = {
877 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
878 DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
879 },
880 .driver_data = (void *)&i8k_config_data[DELL_STUDIO],
881 },
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 },
890 {
891 .ident = "Dell XPS M140",
892 .matches = {
893 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
894 DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
895 },
896 .driver_data = (void *)&i8k_config_data[DELL_XPS],
897 },
898 { }
899 };
900
901 MODULE_DEVICE_TABLE(dmi, i8k_dmi_table);
902
903 static struct dmi_system_id i8k_blacklist_dmi_table[] __initdata = {
904 {
905 /*
906 * CPU fan speed going up and down on Dell Studio XPS 8100
907 * for unknown reasons.
908 */
909 .ident = "Dell Studio XPS 8100",
910 .matches = {
911 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
912 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"),
913 },
914 },
915 { }
916 };
917
918 /*
919 * Probe for the presence of a supported laptop.
920 */
i8k_probe(void)921 static int __init i8k_probe(void)
922 {
923 const struct dmi_system_id *id;
924 int fan, ret;
925
926 /*
927 * Get DMI information
928 */
929 if (!dmi_check_system(i8k_dmi_table) ||
930 dmi_check_system(i8k_blacklist_dmi_table)) {
931 if (!ignore_dmi && !force)
932 return -ENODEV;
933
934 pr_info("not running on a supported Dell system.\n");
935 pr_info("vendor=%s, model=%s, version=%s\n",
936 i8k_get_dmi_data(DMI_SYS_VENDOR),
937 i8k_get_dmi_data(DMI_PRODUCT_NAME),
938 i8k_get_dmi_data(DMI_BIOS_VERSION));
939 }
940
941 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
942 sizeof(bios_version));
943
944 /*
945 * Get SMM Dell signature
946 */
947 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
948 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
949 pr_err("unable to get SMM Dell signature\n");
950 if (!force)
951 return -ENODEV;
952 }
953
954 /*
955 * Set fan multiplier and maximal fan speed from dmi config
956 * Values specified in module parameters override values from dmi
957 */
958 id = dmi_first_match(i8k_dmi_table);
959 if (id && id->driver_data) {
960 const struct i8k_config_data *conf = id->driver_data;
961 if (!fan_mult && conf->fan_mult)
962 fan_mult = conf->fan_mult;
963 if (!fan_max && conf->fan_max)
964 fan_max = conf->fan_max;
965 }
966
967 i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */
968 i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);
969
970 if (!fan_mult) {
971 /*
972 * Autodetect fan multiplier based on nominal rpm
973 * If fan reports rpm value too high then set multiplier to 1
974 */
975 for (fan = 0; fan < 2; ++fan) {
976 ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max);
977 if (ret < 0)
978 continue;
979 if (ret > I8K_FAN_MAX_RPM)
980 i8k_fan_mult = 1;
981 break;
982 }
983 } else {
984 /* Fan multiplier was specified in module param or in dmi */
985 i8k_fan_mult = fan_mult;
986 }
987
988 return 0;
989 }
990
i8k_init(void)991 static int __init i8k_init(void)
992 {
993 struct proc_dir_entry *proc_i8k;
994 int err;
995
996 /* Are we running on an supported laptop? */
997 if (i8k_probe())
998 return -ENODEV;
999
1000 /* Register the proc entry */
1001 proc_i8k = proc_create("i8k", 0, NULL, &i8k_fops);
1002 if (!proc_i8k)
1003 return -ENOENT;
1004
1005 err = i8k_init_hwmon();
1006 if (err)
1007 goto exit_remove_proc;
1008
1009 return 0;
1010
1011 exit_remove_proc:
1012 remove_proc_entry("i8k", NULL);
1013 return err;
1014 }
1015
i8k_exit(void)1016 static void __exit i8k_exit(void)
1017 {
1018 hwmon_device_unregister(i8k_hwmon_dev);
1019 remove_proc_entry("i8k", NULL);
1020 }
1021
1022 module_init(i8k_init);
1023 module_exit(i8k_exit);
1024