?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'for-linus-20190706' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / hwmon / dell-smm-hwmon.c
blob4212d022d2534223511a80bd10ab94e73896754d
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * dell-smm-hwmon.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
4 *
5 * Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org>
6 *
7 * Hwmon integration:
8 * Copyright (C) 2011 Jean Delvare <jdelvare@suse.de>
9 * Copyright (C) 2013, 2014 Guenter Roeck <linux@roeck-us.net>
10 * Copyright (C) 2014, 2015 Pali Rohár <pali.rohar@gmail.com>
11 */
12
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15 #include <linux/cpu.h>
16 #include <linux/delay.h>
17 #include <linux/module.h>
18 #include <linux/types.h>
19 #include <linux/init.h>
20 #include <linux/proc_fs.h>
21 #include <linux/seq_file.h>
22 #include <linux/dmi.h>
23 #include <linux/capability.h>
24 #include <linux/mutex.h>
25 #include <linux/hwmon.h>
26 #include <linux/hwmon-sysfs.h>
27 #include <linux/uaccess.h>
28 #include <linux/io.h>
29 #include <linux/sched.h>
30 #include <linux/ctype.h>
31 #include <linux/smp.h>
32
33 #include <linux/i8k.h>
34
35 #define I8K_SMM_FN_STATUS 0x0025
36 #define I8K_SMM_POWER_STATUS 0x0069
37 #define I8K_SMM_SET_FAN 0x01a3
38 #define I8K_SMM_GET_FAN 0x00a3
39 #define I8K_SMM_GET_SPEED 0x02a3
40 #define I8K_SMM_GET_FAN_TYPE 0x03a3
41 #define I8K_SMM_GET_NOM_SPEED 0x04a3
42 #define I8K_SMM_GET_TEMP 0x10a3
43 #define I8K_SMM_GET_TEMP_TYPE 0x11a3
44 #define I8K_SMM_GET_DELL_SIG1 0xfea3
45 #define I8K_SMM_GET_DELL_SIG2 0xffa3
46
47 #define I8K_FAN_MULT 30
48 #define I8K_FAN_MAX_RPM 30000
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 static DEFINE_MUTEX(i8k_mutex);
62 static char bios_version[4];
63 static char bios_machineid[16];
64 static struct device *i8k_hwmon_dev;
65 static u32 i8k_hwmon_flags;
66 static uint i8k_fan_mult = I8K_FAN_MULT;
67 static uint i8k_pwm_mult;
68 static uint i8k_fan_max = I8K_FAN_HIGH;
69 static bool disallow_fan_type_call;
70 static bool disallow_fan_support;
71
72 #define I8K_HWMON_HAVE_TEMP1 (1 << 0)
73 #define I8K_HWMON_HAVE_TEMP2 (1 << 1)
74 #define I8K_HWMON_HAVE_TEMP3 (1 << 2)
75 #define I8K_HWMON_HAVE_TEMP4 (1 << 3)
76 #define I8K_HWMON_HAVE_TEMP5 (1 << 4)
77 #define I8K_HWMON_HAVE_TEMP6 (1 << 5)
78 #define I8K_HWMON_HAVE_TEMP7 (1 << 6)
79 #define I8K_HWMON_HAVE_TEMP8 (1 << 7)
80 #define I8K_HWMON_HAVE_TEMP9 (1 << 8)
81 #define I8K_HWMON_HAVE_TEMP10 (1 << 9)
82 #define I8K_HWMON_HAVE_FAN1 (1 << 10)
83 #define I8K_HWMON_HAVE_FAN2 (1 << 11)
84 #define I8K_HWMON_HAVE_FAN3 (1 << 12)
85
86 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
87 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
88 MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver");
89 MODULE_LICENSE("GPL");
90 MODULE_ALIAS("i8k");
91
92 static bool force;
93 module_param(force, bool, 0);
94 MODULE_PARM_DESC(force, "Force loading without checking for supported models");
95
96 static bool ignore_dmi;
97 module_param(ignore_dmi, bool, 0);
98 MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
99
100 #if IS_ENABLED(CONFIG_I8K)
101 static bool restricted = true;
102 module_param(restricted, bool, 0);
103 MODULE_PARM_DESC(restricted, "Restrict fan control and serial number to CAP_SYS_ADMIN (default: 1)");
104
105 static bool power_status;
106 module_param(power_status, bool, 0600);
107 MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k (default: 0)");
108 #endif
109
110 static uint fan_mult;
111 module_param(fan_mult, uint, 0);
112 MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)");
113
114 static uint fan_max;
115 module_param(fan_max, uint, 0);
116 MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)");
117
118 struct smm_regs {
119 unsigned int eax;
120 unsigned int ebx __packed;
121 unsigned int ecx __packed;
122 unsigned int edx __packed;
123 unsigned int esi __packed;
124 unsigned int edi __packed;
125 };
126
127 static inline const char *i8k_get_dmi_data(int field)
128 {
129 const char *dmi_data = dmi_get_system_info(field);
130
131 return dmi_data && *dmi_data ? dmi_data : "?";
132 }
133
134 /*
135 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
136 */
137 static int i8k_smm_func(void *par)
138 {
139 int rc;
140 struct smm_regs *regs = par;
141 int eax = regs->eax;
142
143 #ifdef DEBUG
144 int ebx = regs->ebx;
145 unsigned long duration;
146 ktime_t calltime, delta, rettime;
147
148 calltime = ktime_get();
149 #endif
150
151 /* SMM requires CPU 0 */
152 if (smp_processor_id() != 0)
153 return -EBUSY;
154
155 #if defined(CONFIG_X86_64)
156 asm volatile("pushq %%rax\n\t"
157 "movl 0(%%rax),%%edx\n\t"
158 "pushq %%rdx\n\t"
159 "movl 4(%%rax),%%ebx\n\t"
160 "movl 8(%%rax),%%ecx\n\t"
161 "movl 12(%%rax),%%edx\n\t"
162 "movl 16(%%rax),%%esi\n\t"
163 "movl 20(%%rax),%%edi\n\t"
164 "popq %%rax\n\t"
165 "out %%al,$0xb2\n\t"
166 "out %%al,$0x84\n\t"
167 "xchgq %%rax,(%%rsp)\n\t"
168 "movl %%ebx,4(%%rax)\n\t"
169 "movl %%ecx,8(%%rax)\n\t"
170 "movl %%edx,12(%%rax)\n\t"
171 "movl %%esi,16(%%rax)\n\t"
172 "movl %%edi,20(%%rax)\n\t"
173 "popq %%rdx\n\t"
174 "movl %%edx,0(%%rax)\n\t"
175 "pushfq\n\t"
176 "popq %%rax\n\t"
177 "andl $1,%%eax\n"
178 : "=a"(rc)
179 : "a"(regs)
180 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
181 #else
182 asm volatile("pushl %%eax\n\t"
183 "movl 0(%%eax),%%edx\n\t"
184 "push %%edx\n\t"
185 "movl 4(%%eax),%%ebx\n\t"
186 "movl 8(%%eax),%%ecx\n\t"
187 "movl 12(%%eax),%%edx\n\t"
188 "movl 16(%%eax),%%esi\n\t"
189 "movl 20(%%eax),%%edi\n\t"
190 "popl %%eax\n\t"
191 "out %%al,$0xb2\n\t"
192 "out %%al,$0x84\n\t"
193 "xchgl %%eax,(%%esp)\n\t"
194 "movl %%ebx,4(%%eax)\n\t"
195 "movl %%ecx,8(%%eax)\n\t"
196 "movl %%edx,12(%%eax)\n\t"
197 "movl %%esi,16(%%eax)\n\t"
198 "movl %%edi,20(%%eax)\n\t"
199 "popl %%edx\n\t"
200 "movl %%edx,0(%%eax)\n\t"
201 "lahf\n\t"
202 "shrl $8,%%eax\n\t"
203 "andl $1,%%eax\n"
204 : "=a"(rc)
205 : "a"(regs)
206 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
207 #endif
208 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
209 rc = -EINVAL;
210
211 #ifdef DEBUG
212 rettime = ktime_get();
213 delta = ktime_sub(rettime, calltime);
214 duration = ktime_to_ns(delta) >> 10;
215 pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lu usecs)\n", eax, ebx,
216 (rc ? 0xffff : regs->eax & 0xffff), duration);
217 #endif
218
219 return rc;
220 }
221
222 /*
223 * Call the System Management Mode BIOS.
224 */
225 static int i8k_smm(struct smm_regs *regs)
226 {
227 int ret;
228
229 get_online_cpus();
230 ret = smp_call_on_cpu(0, i8k_smm_func, regs, true);
231 put_online_cpus();
232
233 return ret;
234 }
235
236 /*
237 * Read the fan status.
238 */
239 static int i8k_get_fan_status(int fan)
240 {
241 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
242
243 if (disallow_fan_support)
244 return -EINVAL;
245
246 regs.ebx = fan & 0xff;
247 return i8k_smm(&regs) ? : regs.eax & 0xff;
248 }
249
250 /*
251 * Read the fan speed in RPM.
252 */
253 static int i8k_get_fan_speed(int fan)
254 {
255 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
256
257 if (disallow_fan_support)
258 return -EINVAL;
259
260 regs.ebx = fan & 0xff;
261 return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
262 }
263
264 /*
265 * Read the fan type.
266 */
267 static int _i8k_get_fan_type(int fan)
268 {
269 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, };
270
271 if (disallow_fan_support || disallow_fan_type_call)
272 return -EINVAL;
273
274 regs.ebx = fan & 0xff;
275 return i8k_smm(&regs) ? : regs.eax & 0xff;
276 }
277
278 static int i8k_get_fan_type(int fan)
279 {
280 /* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */
281 static int types[3] = { INT_MIN, INT_MIN, INT_MIN };
282
283 if (types[fan] == INT_MIN)
284 types[fan] = _i8k_get_fan_type(fan);
285
286 return types[fan];
287 }
288
289 /*
290 * Read the fan nominal rpm for specific fan speed.
291 */
292 static int i8k_get_fan_nominal_speed(int fan, int speed)
293 {
294 struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, };
295
296 if (disallow_fan_support)
297 return -EINVAL;
298
299 regs.ebx = (fan & 0xff) | (speed << 8);
300 return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
301 }
302
303 /*
304 * Set the fan speed (off, low, high). Returns the new fan status.
305 */
306 static int i8k_set_fan(int fan, int speed)
307 {
308 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
309
310 if (disallow_fan_support)
311 return -EINVAL;
312
313 speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed);
314 regs.ebx = (fan & 0xff) | (speed << 8);
315
316 return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
317 }
318
319 static int i8k_get_temp_type(int sensor)
320 {
321 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, };
322
323 regs.ebx = sensor & 0xff;
324 return i8k_smm(&regs) ? : regs.eax & 0xff;
325 }
326
327 /*
328 * Read the cpu temperature.
329 */
330 static int _i8k_get_temp(int sensor)
331 {
332 struct smm_regs regs = {
333 .eax = I8K_SMM_GET_TEMP,
334 .ebx = sensor & 0xff,
335 };
336
337 return i8k_smm(&regs) ? : regs.eax & 0xff;
338 }
339
340 static int i8k_get_temp(int sensor)
341 {
342 int temp = _i8k_get_temp(sensor);
343
344 /*
345 * Sometimes the temperature sensor returns 0x99, which is out of range.
346 * In this case we retry (once) before returning an error.
347 # 1003655137 00000058 00005a4b
348 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
349 # 1003655139 00000054 00005c52
350 */
351 if (temp == 0x99) {
352 msleep(100);
353 temp = _i8k_get_temp(sensor);
354 }
355 /*
356 * Return -ENODATA for all invalid temperatures.
357 *
358 * Known instances are the 0x99 value as seen above as well as
359 * 0xc1 (193), which may be returned when trying to read the GPU
360 * temperature if the system supports a GPU and it is currently
361 * turned off.
362 */
363 if (temp > I8K_MAX_TEMP)
364 return -ENODATA;
365
366 return temp;
367 }
368
369 static int i8k_get_dell_signature(int req_fn)
370 {
371 struct smm_regs regs = { .eax = req_fn, };
372 int rc;
373
374 rc = i8k_smm(&regs);
375 if (rc < 0)
376 return rc;
377
378 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
379 }
380
381 #if IS_ENABLED(CONFIG_I8K)
382
383 /*
384 * Read the Fn key status.
385 */
386 static int i8k_get_fn_status(void)
387 {
388 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
389 int rc;
390
391 rc = i8k_smm(&regs);
392 if (rc < 0)
393 return rc;
394
395 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
396 case I8K_FN_UP:
397 return I8K_VOL_UP;
398 case I8K_FN_DOWN:
399 return I8K_VOL_DOWN;
400 case I8K_FN_MUTE:
401 return I8K_VOL_MUTE;
402 default:
403 return 0;
404 }
405 }
406
407 /*
408 * Read the power status.
409 */
410 static int i8k_get_power_status(void)
411 {
412 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
413 int rc;
414
415 rc = i8k_smm(&regs);
416 if (rc < 0)
417 return rc;
418
419 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
420 }
421
422 /*
423 * Procfs interface
424 */
425
426 static int
427 i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
428 {
429 int val = 0;
430 int speed;
431 unsigned char buff[16];
432 int __user *argp = (int __user *)arg;
433
434 if (!argp)
435 return -EINVAL;
436
437 switch (cmd) {
438 case I8K_BIOS_VERSION:
439 if (!isdigit(bios_version[0]) || !isdigit(bios_version[1]) ||
440 !isdigit(bios_version[2]))
441 return -EINVAL;
442
443 val = (bios_version[0] << 16) |
444 (bios_version[1] << 8) | bios_version[2];
445 break;
446
447 case I8K_MACHINE_ID:
448 if (restricted && !capable(CAP_SYS_ADMIN))
449 return -EPERM;
450
451 memset(buff, 0, sizeof(buff));
452 strlcpy(buff, bios_machineid, sizeof(buff));
453 break;
454
455 case I8K_FN_STATUS:
456 val = i8k_get_fn_status();
457 break;
458
459 case I8K_POWER_STATUS:
460 val = i8k_get_power_status();
461 break;
462
463 case I8K_GET_TEMP:
464 val = i8k_get_temp(0);
465 break;
466
467 case I8K_GET_SPEED:
468 if (copy_from_user(&val, argp, sizeof(int)))
469 return -EFAULT;
470
471 val = i8k_get_fan_speed(val);
472 break;
473
474 case I8K_GET_FAN:
475 if (copy_from_user(&val, argp, sizeof(int)))
476 return -EFAULT;
477
478 val = i8k_get_fan_status(val);
479 break;
480
481 case I8K_SET_FAN:
482 if (restricted && !capable(CAP_SYS_ADMIN))
483 return -EPERM;
484
485 if (copy_from_user(&val, argp, sizeof(int)))
486 return -EFAULT;
487
488 if (copy_from_user(&speed, argp + 1, sizeof(int)))
489 return -EFAULT;
490
491 val = i8k_set_fan(val, speed);
492 break;
493
494 default:
495 return -EINVAL;
496 }
497
498 if (val < 0)
499 return val;
500
501 switch (cmd) {
502 case I8K_BIOS_VERSION:
503 if (copy_to_user(argp, &val, 4))
504 return -EFAULT;
505
506 break;
507 case I8K_MACHINE_ID:
508 if (copy_to_user(argp, buff, 16))
509 return -EFAULT;
510
511 break;
512 default:
513 if (copy_to_user(argp, &val, sizeof(int)))
514 return -EFAULT;
515
516 break;
517 }
518
519 return 0;
520 }
521
522 static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
523 {
524 long ret;
525
526 mutex_lock(&i8k_mutex);
527 ret = i8k_ioctl_unlocked(fp, cmd, arg);
528 mutex_unlock(&i8k_mutex);
529
530 return ret;
531 }
532
533 /*
534 * Print the information for /proc/i8k.
535 */
536 static int i8k_proc_show(struct seq_file *seq, void *offset)
537 {
538 int fn_key, cpu_temp, ac_power;
539 int left_fan, right_fan, left_speed, right_speed;
540
541 cpu_temp = i8k_get_temp(0); /* 11100 µs */
542 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */
543 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */
544 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */
545 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */
546 fn_key = i8k_get_fn_status(); /* 750 µs */
547 if (power_status)
548 ac_power = i8k_get_power_status(); /* 14700 µs */
549 else
550 ac_power = -1;
551
552 /*
553 * Info:
554 *
555 * 1) Format version (this will change if format changes)
556 * 2) BIOS version
557 * 3) BIOS machine ID
558 * 4) Cpu temperature
559 * 5) Left fan status
560 * 6) Right fan status
561 * 7) Left fan speed
562 * 8) Right fan speed
563 * 9) AC power
564 * 10) Fn Key status
565 */
566 seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
567 I8K_PROC_FMT,
568 bios_version,
569 (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : bios_machineid,
570 cpu_temp,
571 left_fan, right_fan, left_speed, right_speed,
572 ac_power, fn_key);
573
574 return 0;
575 }
576
577 static int i8k_open_fs(struct inode *inode, struct file *file)
578 {
579 return single_open(file, i8k_proc_show, NULL);
580 }
581
582 static const struct file_operations i8k_fops = {
583 .owner = THIS_MODULE,
584 .open = i8k_open_fs,
585 .read = seq_read,
586 .llseek = seq_lseek,
587 .release = single_release,
588 .unlocked_ioctl = i8k_ioctl,
589 };
590
591 static void __init i8k_init_procfs(void)
592 {
593 /* Register the proc entry */
594 proc_create("i8k", 0, NULL, &i8k_fops);
595 }
596
597 static void __exit i8k_exit_procfs(void)
598 {
599 remove_proc_entry("i8k", NULL);
600 }
601
602 #else
603
604 static inline void __init i8k_init_procfs(void)
605 {
606 }
607
608 static inline void __exit i8k_exit_procfs(void)
609 {
610 }
611
612 #endif
613
614 /*
615 * Hwmon interface
616 */
617
618 static ssize_t i8k_hwmon_temp_label_show(struct device *dev,
619 struct device_attribute *devattr,
620 char *buf)
621 {
622 static const char * const labels[] = {
623 "CPU",
624 "GPU",
625 "SODIMM",
626 "Other",
627 "Ambient",
628 "Other",
629 };
630 int index = to_sensor_dev_attr(devattr)->index;
631 int type;
632
633 type = i8k_get_temp_type(index);
634 if (type < 0)
635 return type;
636 if (type >= ARRAY_SIZE(labels))
637 type = ARRAY_SIZE(labels) - 1;
638 return sprintf(buf, "%s\n", labels[type]);
639 }
640
641 static ssize_t i8k_hwmon_temp_show(struct device *dev,
642 struct device_attribute *devattr,
643 char *buf)
644 {
645 int index = to_sensor_dev_attr(devattr)->index;
646 int temp;
647
648 temp = i8k_get_temp(index);
649 if (temp < 0)
650 return temp;
651 return sprintf(buf, "%d\n", temp * 1000);
652 }
653
654 static ssize_t i8k_hwmon_fan_label_show(struct device *dev,
655 struct device_attribute *devattr,
656 char *buf)
657 {
658 static const char * const labels[] = {
659 "Processor Fan",
660 "Motherboard Fan",
661 "Video Fan",
662 "Power Supply Fan",
663 "Chipset Fan",
664 "Other Fan",
665 };
666 int index = to_sensor_dev_attr(devattr)->index;
667 bool dock = false;
668 int type;
669
670 type = i8k_get_fan_type(index);
671 if (type < 0)
672 return type;
673
674 if (type & 0x10) {
675 dock = true;
676 type &= 0x0F;
677 }
678
679 if (type >= ARRAY_SIZE(labels))
680 type = (ARRAY_SIZE(labels) - 1);
681
682 return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]);
683 }
684
685 static ssize_t i8k_hwmon_fan_show(struct device *dev,
686 struct device_attribute *devattr, char *buf)
687 {
688 int index = to_sensor_dev_attr(devattr)->index;
689 int fan_speed;
690
691 fan_speed = i8k_get_fan_speed(index);
692 if (fan_speed < 0)
693 return fan_speed;
694 return sprintf(buf, "%d\n", fan_speed);
695 }
696
697 static ssize_t i8k_hwmon_pwm_show(struct device *dev,
698 struct device_attribute *devattr, char *buf)
699 {
700 int index = to_sensor_dev_attr(devattr)->index;
701 int status;
702
703 status = i8k_get_fan_status(index);
704 if (status < 0)
705 return -EIO;
706 return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255));
707 }
708
709 static ssize_t i8k_hwmon_pwm_store(struct device *dev,
710 struct device_attribute *attr,
711 const char *buf, size_t count)
712 {
713 int index = to_sensor_dev_attr(attr)->index;
714 unsigned long val;
715 int err;
716
717 err = kstrtoul(buf, 10, &val);
718 if (err)
719 return err;
720 val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max);
721
722 mutex_lock(&i8k_mutex);
723 err = i8k_set_fan(index, val);
724 mutex_unlock(&i8k_mutex);
725
726 return err < 0 ? -EIO : count;
727 }
728
729 static SENSOR_DEVICE_ATTR_RO(temp1_input, i8k_hwmon_temp, 0);
730 static SENSOR_DEVICE_ATTR_RO(temp1_label, i8k_hwmon_temp_label, 0);
731 static SENSOR_DEVICE_ATTR_RO(temp2_input, i8k_hwmon_temp, 1);
732 static SENSOR_DEVICE_ATTR_RO(temp2_label, i8k_hwmon_temp_label, 1);
733 static SENSOR_DEVICE_ATTR_RO(temp3_input, i8k_hwmon_temp, 2);
734 static SENSOR_DEVICE_ATTR_RO(temp3_label, i8k_hwmon_temp_label, 2);
735 static SENSOR_DEVICE_ATTR_RO(temp4_input, i8k_hwmon_temp, 3);
736 static SENSOR_DEVICE_ATTR_RO(temp4_label, i8k_hwmon_temp_label, 3);
737 static SENSOR_DEVICE_ATTR_RO(temp5_input, i8k_hwmon_temp, 4);
738 static SENSOR_DEVICE_ATTR_RO(temp5_label, i8k_hwmon_temp_label, 4);
739 static SENSOR_DEVICE_ATTR_RO(temp6_input, i8k_hwmon_temp, 5);
740 static SENSOR_DEVICE_ATTR_RO(temp6_label, i8k_hwmon_temp_label, 5);
741 static SENSOR_DEVICE_ATTR_RO(temp7_input, i8k_hwmon_temp, 6);
742 static SENSOR_DEVICE_ATTR_RO(temp7_label, i8k_hwmon_temp_label, 6);
743 static SENSOR_DEVICE_ATTR_RO(temp8_input, i8k_hwmon_temp, 7);
744 static SENSOR_DEVICE_ATTR_RO(temp8_label, i8k_hwmon_temp_label, 7);
745 static SENSOR_DEVICE_ATTR_RO(temp9_input, i8k_hwmon_temp, 8);
746 static SENSOR_DEVICE_ATTR_RO(temp9_label, i8k_hwmon_temp_label, 8);
747 static SENSOR_DEVICE_ATTR_RO(temp10_input, i8k_hwmon_temp, 9);
748 static SENSOR_DEVICE_ATTR_RO(temp10_label, i8k_hwmon_temp_label, 9);
749 static SENSOR_DEVICE_ATTR_RO(fan1_input, i8k_hwmon_fan, 0);
750 static SENSOR_DEVICE_ATTR_RO(fan1_label, i8k_hwmon_fan_label, 0);
751 static SENSOR_DEVICE_ATTR_RW(pwm1, i8k_hwmon_pwm, 0);
752 static SENSOR_DEVICE_ATTR_RO(fan2_input, i8k_hwmon_fan, 1);
753 static SENSOR_DEVICE_ATTR_RO(fan2_label, i8k_hwmon_fan_label, 1);
754 static SENSOR_DEVICE_ATTR_RW(pwm2, i8k_hwmon_pwm, 1);
755 static SENSOR_DEVICE_ATTR_RO(fan3_input, i8k_hwmon_fan, 2);
756 static SENSOR_DEVICE_ATTR_RO(fan3_label, i8k_hwmon_fan_label, 2);
757 static SENSOR_DEVICE_ATTR_RW(pwm3, i8k_hwmon_pwm, 2);
758
759 static struct attribute *i8k_attrs[] = {
760 &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */
761 &sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */
762 &sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */
763 &sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */
764 &sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */
765 &sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */
766 &sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */
767 &sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */
768 &sensor_dev_attr_temp5_input.dev_attr.attr, /* 8 */
769 &sensor_dev_attr_temp5_label.dev_attr.attr, /* 9 */
770 &sensor_dev_attr_temp6_input.dev_attr.attr, /* 10 */
771 &sensor_dev_attr_temp6_label.dev_attr.attr, /* 11 */
772 &sensor_dev_attr_temp7_input.dev_attr.attr, /* 12 */
773 &sensor_dev_attr_temp7_label.dev_attr.attr, /* 13 */
774 &sensor_dev_attr_temp8_input.dev_attr.attr, /* 14 */
775 &sensor_dev_attr_temp8_label.dev_attr.attr, /* 15 */
776 &sensor_dev_attr_temp9_input.dev_attr.attr, /* 16 */
777 &sensor_dev_attr_temp9_label.dev_attr.attr, /* 17 */
778 &sensor_dev_attr_temp10_input.dev_attr.attr, /* 18 */
779 &sensor_dev_attr_temp10_label.dev_attr.attr, /* 19 */
780 &sensor_dev_attr_fan1_input.dev_attr.attr, /* 20 */
781 &sensor_dev_attr_fan1_label.dev_attr.attr, /* 21 */
782 &sensor_dev_attr_pwm1.dev_attr.attr, /* 22 */
783 &sensor_dev_attr_fan2_input.dev_attr.attr, /* 23 */
784 &sensor_dev_attr_fan2_label.dev_attr.attr, /* 24 */
785 &sensor_dev_attr_pwm2.dev_attr.attr, /* 25 */
786 &sensor_dev_attr_fan3_input.dev_attr.attr, /* 26 */
787 &sensor_dev_attr_fan3_label.dev_attr.attr, /* 27 */
788 &sensor_dev_attr_pwm3.dev_attr.attr, /* 28 */
789 NULL
790 };
791
792 static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
793 int index)
794 {
795 if (disallow_fan_support && index >= 8)
796 return 0;
797 if (disallow_fan_type_call &&
798 (index == 9 || index == 12 || index == 15))
799 return 0;
800 if (index >= 0 && index <= 1 &&
801 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
802 return 0;
803 if (index >= 2 && index <= 3 &&
804 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
805 return 0;
806 if (index >= 4 && index <= 5 &&
807 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
808 return 0;
809 if (index >= 6 && index <= 7 &&
810 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
811 return 0;
812 if (index >= 8 && index <= 9 &&
813 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP5))
814 return 0;
815 if (index >= 10 && index <= 11 &&
816 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP6))
817 return 0;
818 if (index >= 12 && index <= 13 &&
819 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP7))
820 return 0;
821 if (index >= 14 && index <= 15 &&
822 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP8))
823 return 0;
824 if (index >= 16 && index <= 17 &&
825 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP9))
826 return 0;
827 if (index >= 18 && index <= 19 &&
828 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP10))
829 return 0;
830
831 if (index >= 20 && index <= 22 &&
832 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
833 return 0;
834 if (index >= 23 && index <= 25 &&
835 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
836 return 0;
837 if (index >= 26 && index <= 28 &&
838 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN3))
839 return 0;
840
841 return attr->mode;
842 }
843
844 static const struct attribute_group i8k_group = {
845 .attrs = i8k_attrs,
846 .is_visible = i8k_is_visible,
847 };
848 __ATTRIBUTE_GROUPS(i8k);
849
850 static int __init i8k_init_hwmon(void)
851 {
852 int err;
853
854 i8k_hwmon_flags = 0;
855
856 /* CPU temperature attributes, if temperature type is OK */
857 err = i8k_get_temp_type(0);
858 if (err >= 0)
859 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1;
860 /* check for additional temperature sensors */
861 err = i8k_get_temp_type(1);
862 if (err >= 0)
863 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2;
864 err = i8k_get_temp_type(2);
865 if (err >= 0)
866 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3;
867 err = i8k_get_temp_type(3);
868 if (err >= 0)
869 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
870 err = i8k_get_temp_type(4);
871 if (err >= 0)
872 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP5;
873 err = i8k_get_temp_type(5);
874 if (err >= 0)
875 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP6;
876 err = i8k_get_temp_type(6);
877 if (err >= 0)
878 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP7;
879 err = i8k_get_temp_type(7);
880 if (err >= 0)
881 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP8;
882 err = i8k_get_temp_type(8);
883 if (err >= 0)
884 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP9;
885 err = i8k_get_temp_type(9);
886 if (err >= 0)
887 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP10;
888
889 /* First fan attributes, if fan status or type is OK */
890 err = i8k_get_fan_status(0);
891 if (err < 0)
892 err = i8k_get_fan_type(0);
893 if (err >= 0)
894 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
895
896 /* Second fan attributes, if fan status or type is OK */
897 err = i8k_get_fan_status(1);
898 if (err < 0)
899 err = i8k_get_fan_type(1);
900 if (err >= 0)
901 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
902
903 /* Third fan attributes, if fan status or type is OK */
904 err = i8k_get_fan_status(2);
905 if (err < 0)
906 err = i8k_get_fan_type(2);
907 if (err >= 0)
908 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN3;
909
910 i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm",
911 NULL, i8k_groups);
912 if (IS_ERR(i8k_hwmon_dev)) {
913 err = PTR_ERR(i8k_hwmon_dev);
914 i8k_hwmon_dev = NULL;
915 pr_err("hwmon registration failed (%d)\n", err);
916 return err;
917 }
918 return 0;
919 }
920
921 struct i8k_config_data {
922 uint fan_mult;
923 uint fan_max;
924 };
925
926 enum i8k_configs {
927 DELL_LATITUDE_D520,
928 DELL_PRECISION_490,
929 DELL_STUDIO,
930 DELL_XPS,
931 };
932
933 static const struct i8k_config_data i8k_config_data[] = {
934 [DELL_LATITUDE_D520] = {
935 .fan_mult = 1,
936 .fan_max = I8K_FAN_TURBO,
937 },
938 [DELL_PRECISION_490] = {
939 .fan_mult = 1,
940 .fan_max = I8K_FAN_TURBO,
941 },
942 [DELL_STUDIO] = {
943 .fan_mult = 1,
944 .fan_max = I8K_FAN_HIGH,
945 },
946 [DELL_XPS] = {
947 .fan_mult = 1,
948 .fan_max = I8K_FAN_HIGH,
949 },
950 };
951
952 static const struct dmi_system_id i8k_dmi_table[] __initconst = {
953 {
954 .ident = "Dell Inspiron",
955 .matches = {
956 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
957 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
958 },
959 },
960 {
961 .ident = "Dell Latitude",
962 .matches = {
963 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
964 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
965 },
966 },
967 {
968 .ident = "Dell Inspiron 2",
969 .matches = {
970 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
971 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
972 },
973 },
974 {
975 .ident = "Dell Latitude D520",
976 .matches = {
977 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
978 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"),
979 },
980 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520],
981 },
982 {
983 .ident = "Dell Latitude 2",
984 .matches = {
985 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
986 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
987 },
988 },
989 { /* UK Inspiron 6400 */
990 .ident = "Dell Inspiron 3",
991 .matches = {
992 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
993 DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
994 },
995 },
996 {
997 .ident = "Dell Inspiron 3",
998 .matches = {
999 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1000 DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
1001 },
1002 },
1003 {
1004 .ident = "Dell Precision 490",
1005 .matches = {
1006 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1007 DMI_MATCH(DMI_PRODUCT_NAME,
1008 "Precision WorkStation 490"),
1009 },
1010 .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490],
1011 },
1012 {
1013 .ident = "Dell Precision",
1014 .matches = {
1015 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1016 DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
1017 },
1018 },
1019 {
1020 .ident = "Dell Vostro",
1021 .matches = {
1022 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1023 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
1024 },
1025 },
1026 {
1027 .ident = "Dell XPS421",
1028 .matches = {
1029 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1030 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
1031 },
1032 },
1033 {
1034 .ident = "Dell Studio",
1035 .matches = {
1036 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1037 DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
1038 },
1039 .driver_data = (void *)&i8k_config_data[DELL_STUDIO],
1040 },
1041 {
1042 .ident = "Dell XPS 13",
1043 .matches = {
1044 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1045 DMI_MATCH(DMI_PRODUCT_NAME, "XPS13"),
1046 },
1047 .driver_data = (void *)&i8k_config_data[DELL_XPS],
1048 },
1049 {
1050 .ident = "Dell XPS M140",
1051 .matches = {
1052 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1053 DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
1054 },
1055 .driver_data = (void *)&i8k_config_data[DELL_XPS],
1056 },
1057 {
1058 .ident = "Dell XPS 15 9560",
1059 .matches = {
1060 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1061 DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9560"),
1062 },
1063 },
1064 {
1065 .ident = "Dell XPS 15 9570",
1066 .matches = {
1067 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1068 DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9570"),
1069 },
1070 },
1071 { }
1072 };
1073
1074 MODULE_DEVICE_TABLE(dmi, i8k_dmi_table);
1075
1076 /*
1077 * On some machines once I8K_SMM_GET_FAN_TYPE is issued then CPU fan speed
1078 * randomly going up and down due to bug in Dell SMM or BIOS. Here is blacklist
1079 * of affected Dell machines for which we disallow I8K_SMM_GET_FAN_TYPE call.
1080 * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121
1081 */
1082 static const struct dmi_system_id i8k_blacklist_fan_type_dmi_table[] __initconst = {
1083 {
1084 .ident = "Dell Studio XPS 8000",
1085 .matches = {
1086 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1087 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000"),
1088 },
1089 },
1090 {
1091 .ident = "Dell Studio XPS 8100",
1092 .matches = {
1093 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1094 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"),
1095 },
1096 },
1097 {
1098 .ident = "Dell Inspiron 580",
1099 .matches = {
1100 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1101 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 580 "),
1102 },
1103 },
1104 { }
1105 };
1106
1107 /*
1108 * On some machines all fan related SMM functions implemented by Dell BIOS
1109 * firmware freeze kernel for about 500ms. Until Dell fixes these problems fan
1110 * support for affected blacklisted Dell machines stay disabled.
1111 * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=195751
1112 */
1113 static struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initdata = {
1114 {
1115 .ident = "Dell Inspiron 7720",
1116 .matches = {
1117 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1118 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
1119 },
1120 },
1121 {
1122 .ident = "Dell Vostro 3360",
1123 .matches = {
1124 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1125 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
1126 },
1127 },
1128 {
1129 .ident = "Dell XPS13 9333",
1130 .matches = {
1131 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1132 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
1133 },
1134 },
1135 { }
1136 };
1137
1138 /*
1139 * Probe for the presence of a supported laptop.
1140 */
1141 static int __init i8k_probe(void)
1142 {
1143 const struct dmi_system_id *id;
1144 int fan, ret;
1145
1146 /*
1147 * Get DMI information
1148 */
1149 if (!dmi_check_system(i8k_dmi_table)) {
1150 if (!ignore_dmi && !force)
1151 return -ENODEV;
1152
1153 pr_info("not running on a supported Dell system.\n");
1154 pr_info("vendor=%s, model=%s, version=%s\n",
1155 i8k_get_dmi_data(DMI_SYS_VENDOR),
1156 i8k_get_dmi_data(DMI_PRODUCT_NAME),
1157 i8k_get_dmi_data(DMI_BIOS_VERSION));
1158 }
1159
1160 if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) {
1161 pr_warn("broken Dell BIOS detected, disallow fan support\n");
1162 if (!force)
1163 disallow_fan_support = true;
1164 }
1165
1166 if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) {
1167 pr_warn("broken Dell BIOS detected, disallow fan type call\n");
1168 if (!force)
1169 disallow_fan_type_call = true;
1170 }
1171
1172 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
1173 sizeof(bios_version));
1174 strlcpy(bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
1175 sizeof(bios_machineid));
1176
1177 /*
1178 * Get SMM Dell signature
1179 */
1180 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
1181 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
1182 pr_err("unable to get SMM Dell signature\n");
1183 if (!force)
1184 return -ENODEV;
1185 }
1186
1187 /*
1188 * Set fan multiplier and maximal fan speed from dmi config
1189 * Values specified in module parameters override values from dmi
1190 */
1191 id = dmi_first_match(i8k_dmi_table);
1192 if (id && id->driver_data) {
1193 const struct i8k_config_data *conf = id->driver_data;
1194 if (!fan_mult && conf->fan_mult)
1195 fan_mult = conf->fan_mult;
1196 if (!fan_max && conf->fan_max)
1197 fan_max = conf->fan_max;
1198 }
1199
1200 i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */
1201 i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);
1202
1203 if (!fan_mult) {
1204 /*
1205 * Autodetect fan multiplier based on nominal rpm
1206 * If fan reports rpm value too high then set multiplier to 1
1207 */
1208 for (fan = 0; fan < 2; ++fan) {
1209 ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max);
1210 if (ret < 0)
1211 continue;
1212 if (ret > I8K_FAN_MAX_RPM)
1213 i8k_fan_mult = 1;
1214 break;
1215 }
1216 } else {
1217 /* Fan multiplier was specified in module param or in dmi */
1218 i8k_fan_mult = fan_mult;
1219 }
1220
1221 return 0;
1222 }
1223
1224 static int __init i8k_init(void)
1225 {
1226 int err;
1227
1228 /* Are we running on an supported laptop? */
1229 if (i8k_probe())
1230 return -ENODEV;
1231
1232 err = i8k_init_hwmon();
1233 if (err)
1234 return err;
1235
1236 i8k_init_procfs();
1237 return 0;
1238 }
1239
1240 static void __exit i8k_exit(void)
1241 {
1242 hwmon_device_unregister(i8k_hwmon_dev);
1243 i8k_exit_procfs();
1244 }
1245
1246 module_init(i8k_init);
1247 module_exit(i8k_exit);
Linux with added FPC-III support