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[mirror_ubuntu-bionic-kernel.git] / drivers / hwmon / dell-smm-hwmon.c
1 /*
2 * dell-smm-hwmon.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, 2015 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/cpu.h>
25 #include <linux/delay.h>
26 #include <linux/module.h>
27 #include <linux/types.h>
28 #include <linux/init.h>
29 #include <linux/proc_fs.h>
30 #include <linux/seq_file.h>
31 #include <linux/dmi.h>
32 #include <linux/capability.h>
33 #include <linux/mutex.h>
34 #include <linux/hwmon.h>
35 #include <linux/hwmon-sysfs.h>
36 #include <linux/uaccess.h>
37 #include <linux/io.h>
38 #include <linux/sched.h>
39 #include <linux/ctype.h>
40 #include <linux/smp.h>
41
42 #include <linux/i8k.h>
43
44 #define I8K_SMM_FN_STATUS 0x0025
45 #define I8K_SMM_POWER_STATUS 0x0069
46 #define I8K_SMM_SET_FAN 0x01a3
47 #define I8K_SMM_GET_FAN 0x00a3
48 #define I8K_SMM_GET_SPEED 0x02a3
49 #define I8K_SMM_GET_FAN_TYPE 0x03a3
50 #define I8K_SMM_GET_NOM_SPEED 0x04a3
51 #define I8K_SMM_GET_TEMP 0x10a3
52 #define I8K_SMM_GET_TEMP_TYPE 0x11a3
53 #define I8K_SMM_GET_DELL_SIG1 0xfea3
54 #define I8K_SMM_GET_DELL_SIG2 0xffa3
55
56 #define I8K_FAN_MULT 30
57 #define I8K_FAN_MAX_RPM 30000
58 #define I8K_MAX_TEMP 127
59
60 #define I8K_FN_NONE 0x00
61 #define I8K_FN_UP 0x01
62 #define I8K_FN_DOWN 0x02
63 #define I8K_FN_MUTE 0x04
64 #define I8K_FN_MASK 0x07
65 #define I8K_FN_SHIFT 8
66
67 #define I8K_POWER_AC 0x05
68 #define I8K_POWER_BATTERY 0x01
69
70 static DEFINE_MUTEX(i8k_mutex);
71 static char bios_version[4];
72 static char bios_machineid[16];
73 static struct device *i8k_hwmon_dev;
74 static u32 i8k_hwmon_flags;
75 static uint i8k_fan_mult = I8K_FAN_MULT;
76 static uint i8k_pwm_mult;
77 static uint i8k_fan_max = I8K_FAN_HIGH;
78 static bool disallow_fan_type_call;
79
80 #define I8K_HWMON_HAVE_TEMP1 (1 << 0)
81 #define I8K_HWMON_HAVE_TEMP2 (1 << 1)
82 #define I8K_HWMON_HAVE_TEMP3 (1 << 2)
83 #define I8K_HWMON_HAVE_TEMP4 (1 << 3)
84 #define I8K_HWMON_HAVE_FAN1 (1 << 4)
85 #define I8K_HWMON_HAVE_FAN2 (1 << 5)
86 #define I8K_HWMON_HAVE_FAN3 (1 << 6)
87
88 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
89 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
90 MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver");
91 MODULE_LICENSE("GPL");
92 MODULE_ALIAS("i8k");
93
94 static bool force;
95 module_param(force, bool, 0);
96 MODULE_PARM_DESC(force, "Force loading without checking for supported models");
97
98 static bool ignore_dmi;
99 module_param(ignore_dmi, bool, 0);
100 MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
101
102 #if IS_ENABLED(CONFIG_I8K)
103 static bool restricted = true;
104 module_param(restricted, bool, 0);
105 MODULE_PARM_DESC(restricted, "Restrict fan control and serial number to CAP_SYS_ADMIN (default: 1)");
106
107 static bool power_status;
108 module_param(power_status, bool, 0600);
109 MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k (default: 0)");
110 #endif
111
112 static uint fan_mult;
113 module_param(fan_mult, uint, 0);
114 MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)");
115
116 static uint fan_max;
117 module_param(fan_max, uint, 0);
118 MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)");
119
120 struct smm_regs {
121 unsigned int eax;
122 unsigned int ebx __packed;
123 unsigned int ecx __packed;
124 unsigned int edx __packed;
125 unsigned int esi __packed;
126 unsigned int edi __packed;
127 };
128
129 static inline const char *i8k_get_dmi_data(int field)
130 {
131 const char *dmi_data = dmi_get_system_info(field);
132
133 return dmi_data && *dmi_data ? dmi_data : "?";
134 }
135
136 /*
137 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
138 */
139 static int i8k_smm_func(void *par)
140 {
141 int rc;
142 struct smm_regs *regs = par;
143 int eax = regs->eax;
144
145 #ifdef DEBUG
146 int ebx = regs->ebx;
147 unsigned long duration;
148 ktime_t calltime, delta, rettime;
149
150 calltime = ktime_get();
151 #endif
152
153 /* SMM requires CPU 0 */
154 if (smp_processor_id() != 0)
155 return -EBUSY;
156
157 #if defined(CONFIG_X86_64)
158 asm volatile("pushq %%rax\n\t"
159 "movl 0(%%rax),%%edx\n\t"
160 "pushq %%rdx\n\t"
161 "movl 4(%%rax),%%ebx\n\t"
162 "movl 8(%%rax),%%ecx\n\t"
163 "movl 12(%%rax),%%edx\n\t"
164 "movl 16(%%rax),%%esi\n\t"
165 "movl 20(%%rax),%%edi\n\t"
166 "popq %%rax\n\t"
167 "out %%al,$0xb2\n\t"
168 "out %%al,$0x84\n\t"
169 "xchgq %%rax,(%%rsp)\n\t"
170 "movl %%ebx,4(%%rax)\n\t"
171 "movl %%ecx,8(%%rax)\n\t"
172 "movl %%edx,12(%%rax)\n\t"
173 "movl %%esi,16(%%rax)\n\t"
174 "movl %%edi,20(%%rax)\n\t"
175 "popq %%rdx\n\t"
176 "movl %%edx,0(%%rax)\n\t"
177 "pushfq\n\t"
178 "popq %%rax\n\t"
179 "andl $1,%%eax\n"
180 : "=a"(rc)
181 : "a"(regs)
182 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
183 #else
184 asm volatile("pushl %%eax\n\t"
185 "movl 0(%%eax),%%edx\n\t"
186 "push %%edx\n\t"
187 "movl 4(%%eax),%%ebx\n\t"
188 "movl 8(%%eax),%%ecx\n\t"
189 "movl 12(%%eax),%%edx\n\t"
190 "movl 16(%%eax),%%esi\n\t"
191 "movl 20(%%eax),%%edi\n\t"
192 "popl %%eax\n\t"
193 "out %%al,$0xb2\n\t"
194 "out %%al,$0x84\n\t"
195 "xchgl %%eax,(%%esp)\n\t"
196 "movl %%ebx,4(%%eax)\n\t"
197 "movl %%ecx,8(%%eax)\n\t"
198 "movl %%edx,12(%%eax)\n\t"
199 "movl %%esi,16(%%eax)\n\t"
200 "movl %%edi,20(%%eax)\n\t"
201 "popl %%edx\n\t"
202 "movl %%edx,0(%%eax)\n\t"
203 "lahf\n\t"
204 "shrl $8,%%eax\n\t"
205 "andl $1,%%eax\n"
206 : "=a"(rc)
207 : "a"(regs)
208 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
209 #endif
210 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
211 rc = -EINVAL;
212
213 #ifdef DEBUG
214 rettime = ktime_get();
215 delta = ktime_sub(rettime, calltime);
216 duration = ktime_to_ns(delta) >> 10;
217 pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lu usecs)\n", eax, ebx,
218 (rc ? 0xffff : regs->eax & 0xffff), duration);
219 #endif
220
221 return rc;
222 }
223
224 /*
225 * Call the System Management Mode BIOS.
226 */
227 static int i8k_smm(struct smm_regs *regs)
228 {
229 int ret;
230
231 get_online_cpus();
232 ret = smp_call_on_cpu(0, i8k_smm_func, regs, true);
233 put_online_cpus();
234
235 return ret;
236 }
237
238 /*
239 * Read the fan status.
240 */
241 static int i8k_get_fan_status(int fan)
242 {
243 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
244
245 regs.ebx = fan & 0xff;
246 return i8k_smm(&regs) ? : regs.eax & 0xff;
247 }
248
249 /*
250 * Read the fan speed in RPM.
251 */
252 static int i8k_get_fan_speed(int fan)
253 {
254 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
255
256 regs.ebx = fan & 0xff;
257 return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
258 }
259
260 /*
261 * Read the fan type.
262 */
263 static int _i8k_get_fan_type(int fan)
264 {
265 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, };
266
267 if (disallow_fan_type_call)
268 return -EINVAL;
269
270 regs.ebx = fan & 0xff;
271 return i8k_smm(&regs) ? : regs.eax & 0xff;
272 }
273
274 static int i8k_get_fan_type(int fan)
275 {
276 /* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */
277 static int types[3] = { INT_MIN, INT_MIN, INT_MIN };
278
279 if (types[fan] == INT_MIN)
280 types[fan] = _i8k_get_fan_type(fan);
281
282 return types[fan];
283 }
284
285 /*
286 * Read the fan nominal rpm for specific fan speed.
287 */
288 static int i8k_get_fan_nominal_speed(int fan, int speed)
289 {
290 struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, };
291
292 regs.ebx = (fan & 0xff) | (speed << 8);
293 return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
294 }
295
296 /*
297 * Set the fan speed (off, low, high). Returns the new fan status.
298 */
299 static int i8k_set_fan(int fan, int speed)
300 {
301 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
302
303 speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed);
304 regs.ebx = (fan & 0xff) | (speed << 8);
305
306 return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
307 }
308
309 static int i8k_get_temp_type(int sensor)
310 {
311 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, };
312
313 regs.ebx = sensor & 0xff;
314 return i8k_smm(&regs) ? : regs.eax & 0xff;
315 }
316
317 /*
318 * Read the cpu temperature.
319 */
320 static int _i8k_get_temp(int sensor)
321 {
322 struct smm_regs regs = {
323 .eax = I8K_SMM_GET_TEMP,
324 .ebx = sensor & 0xff,
325 };
326
327 return i8k_smm(&regs) ? : regs.eax & 0xff;
328 }
329
330 static int i8k_get_temp(int sensor)
331 {
332 int temp = _i8k_get_temp(sensor);
333
334 /*
335 * Sometimes the temperature sensor returns 0x99, which is out of range.
336 * In this case we retry (once) before returning an error.
337 # 1003655137 00000058 00005a4b
338 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
339 # 1003655139 00000054 00005c52
340 */
341 if (temp == 0x99) {
342 msleep(100);
343 temp = _i8k_get_temp(sensor);
344 }
345 /*
346 * Return -ENODATA for all invalid temperatures.
347 *
348 * Known instances are the 0x99 value as seen above as well as
349 * 0xc1 (193), which may be returned when trying to read the GPU
350 * temperature if the system supports a GPU and it is currently
351 * turned off.
352 */
353 if (temp > I8K_MAX_TEMP)
354 return -ENODATA;
355
356 return temp;
357 }
358
359 static int i8k_get_dell_signature(int req_fn)
360 {
361 struct smm_regs regs = { .eax = req_fn, };
362 int rc;
363
364 rc = i8k_smm(&regs);
365 if (rc < 0)
366 return rc;
367
368 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
369 }
370
371 #if IS_ENABLED(CONFIG_I8K)
372
373 /*
374 * Read the Fn key status.
375 */
376 static int i8k_get_fn_status(void)
377 {
378 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
379 int rc;
380
381 rc = i8k_smm(&regs);
382 if (rc < 0)
383 return rc;
384
385 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
386 case I8K_FN_UP:
387 return I8K_VOL_UP;
388 case I8K_FN_DOWN:
389 return I8K_VOL_DOWN;
390 case I8K_FN_MUTE:
391 return I8K_VOL_MUTE;
392 default:
393 return 0;
394 }
395 }
396
397 /*
398 * Read the power status.
399 */
400 static int i8k_get_power_status(void)
401 {
402 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
403 int rc;
404
405 rc = i8k_smm(&regs);
406 if (rc < 0)
407 return rc;
408
409 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
410 }
411
412 /*
413 * Procfs interface
414 */
415
416 static int
417 i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
418 {
419 int val = 0;
420 int speed;
421 unsigned char buff[16];
422 int __user *argp = (int __user *)arg;
423
424 if (!argp)
425 return -EINVAL;
426
427 switch (cmd) {
428 case I8K_BIOS_VERSION:
429 if (!isdigit(bios_version[0]) || !isdigit(bios_version[1]) ||
430 !isdigit(bios_version[2]))
431 return -EINVAL;
432
433 val = (bios_version[0] << 16) |
434 (bios_version[1] << 8) | bios_version[2];
435 break;
436
437 case I8K_MACHINE_ID:
438 if (restricted && !capable(CAP_SYS_ADMIN))
439 return -EPERM;
440
441 memset(buff, 0, sizeof(buff));
442 strlcpy(buff, bios_machineid, sizeof(buff));
443 break;
444
445 case I8K_FN_STATUS:
446 val = i8k_get_fn_status();
447 break;
448
449 case I8K_POWER_STATUS:
450 val = i8k_get_power_status();
451 break;
452
453 case I8K_GET_TEMP:
454 val = i8k_get_temp(0);
455 break;
456
457 case I8K_GET_SPEED:
458 if (copy_from_user(&val, argp, sizeof(int)))
459 return -EFAULT;
460
461 val = i8k_get_fan_speed(val);
462 break;
463
464 case I8K_GET_FAN:
465 if (copy_from_user(&val, argp, sizeof(int)))
466 return -EFAULT;
467
468 val = i8k_get_fan_status(val);
469 break;
470
471 case I8K_SET_FAN:
472 if (restricted && !capable(CAP_SYS_ADMIN))
473 return -EPERM;
474
475 if (copy_from_user(&val, argp, sizeof(int)))
476 return -EFAULT;
477
478 if (copy_from_user(&speed, argp + 1, sizeof(int)))
479 return -EFAULT;
480
481 val = i8k_set_fan(val, speed);
482 break;
483
484 default:
485 return -EINVAL;
486 }
487
488 if (val < 0)
489 return val;
490
491 switch (cmd) {
492 case I8K_BIOS_VERSION:
493 if (copy_to_user(argp, &val, 4))
494 return -EFAULT;
495
496 break;
497 case I8K_MACHINE_ID:
498 if (copy_to_user(argp, buff, 16))
499 return -EFAULT;
500
501 break;
502 default:
503 if (copy_to_user(argp, &val, sizeof(int)))
504 return -EFAULT;
505
506 break;
507 }
508
509 return 0;
510 }
511
512 static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
513 {
514 long ret;
515
516 mutex_lock(&i8k_mutex);
517 ret = i8k_ioctl_unlocked(fp, cmd, arg);
518 mutex_unlock(&i8k_mutex);
519
520 return ret;
521 }
522
523 /*
524 * Print the information for /proc/i8k.
525 */
526 static int i8k_proc_show(struct seq_file *seq, void *offset)
527 {
528 int fn_key, cpu_temp, ac_power;
529 int left_fan, right_fan, left_speed, right_speed;
530
531 cpu_temp = i8k_get_temp(0); /* 11100 µs */
532 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */
533 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */
534 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */
535 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */
536 fn_key = i8k_get_fn_status(); /* 750 µs */
537 if (power_status)
538 ac_power = i8k_get_power_status(); /* 14700 µs */
539 else
540 ac_power = -1;
541
542 /*
543 * Info:
544 *
545 * 1) Format version (this will change if format changes)
546 * 2) BIOS version
547 * 3) BIOS machine ID
548 * 4) Cpu temperature
549 * 5) Left fan status
550 * 6) Right fan status
551 * 7) Left fan speed
552 * 8) Right fan speed
553 * 9) AC power
554 * 10) Fn Key status
555 */
556 seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
557 I8K_PROC_FMT,
558 bios_version,
559 (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : bios_machineid,
560 cpu_temp,
561 left_fan, right_fan, left_speed, right_speed,
562 ac_power, fn_key);
563
564 return 0;
565 }
566
567 static int i8k_open_fs(struct inode *inode, struct file *file)
568 {
569 return single_open(file, i8k_proc_show, NULL);
570 }
571
572 static const struct file_operations i8k_fops = {
573 .owner = THIS_MODULE,
574 .open = i8k_open_fs,
575 .read = seq_read,
576 .llseek = seq_lseek,
577 .release = single_release,
578 .unlocked_ioctl = i8k_ioctl,
579 };
580
581 static void __init i8k_init_procfs(void)
582 {
583 /* Register the proc entry */
584 proc_create("i8k", 0, NULL, &i8k_fops);
585 }
586
587 static void __exit i8k_exit_procfs(void)
588 {
589 remove_proc_entry("i8k", NULL);
590 }
591
592 #else
593
594 static inline void __init i8k_init_procfs(void)
595 {
596 }
597
598 static inline void __exit i8k_exit_procfs(void)
599 {
600 }
601
602 #endif
603
604 /*
605 * Hwmon interface
606 */
607
608 static ssize_t i8k_hwmon_show_temp_label(struct device *dev,
609 struct device_attribute *devattr,
610 char *buf)
611 {
612 static const char * const labels[] = {
613 "CPU",
614 "GPU",
615 "SODIMM",
616 "Other",
617 "Ambient",
618 "Other",
619 };
620 int index = to_sensor_dev_attr(devattr)->index;
621 int type;
622
623 type = i8k_get_temp_type(index);
624 if (type < 0)
625 return type;
626 if (type >= ARRAY_SIZE(labels))
627 type = ARRAY_SIZE(labels) - 1;
628 return sprintf(buf, "%s\n", labels[type]);
629 }
630
631 static ssize_t i8k_hwmon_show_temp(struct device *dev,
632 struct device_attribute *devattr,
633 char *buf)
634 {
635 int index = to_sensor_dev_attr(devattr)->index;
636 int temp;
637
638 temp = i8k_get_temp(index);
639 if (temp < 0)
640 return temp;
641 return sprintf(buf, "%d\n", temp * 1000);
642 }
643
644 static ssize_t i8k_hwmon_show_fan_label(struct device *dev,
645 struct device_attribute *devattr,
646 char *buf)
647 {
648 static const char * const labels[] = {
649 "Processor Fan",
650 "Motherboard Fan",
651 "Video Fan",
652 "Power Supply Fan",
653 "Chipset Fan",
654 "Other Fan",
655 };
656 int index = to_sensor_dev_attr(devattr)->index;
657 bool dock = false;
658 int type;
659
660 type = i8k_get_fan_type(index);
661 if (type < 0)
662 return type;
663
664 if (type & 0x10) {
665 dock = true;
666 type &= 0x0F;
667 }
668
669 if (type >= ARRAY_SIZE(labels))
670 type = (ARRAY_SIZE(labels) - 1);
671
672 return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]);
673 }
674
675 static ssize_t i8k_hwmon_show_fan(struct device *dev,
676 struct device_attribute *devattr,
677 char *buf)
678 {
679 int index = to_sensor_dev_attr(devattr)->index;
680 int fan_speed;
681
682 fan_speed = i8k_get_fan_speed(index);
683 if (fan_speed < 0)
684 return fan_speed;
685 return sprintf(buf, "%d\n", fan_speed);
686 }
687
688 static ssize_t i8k_hwmon_show_pwm(struct device *dev,
689 struct device_attribute *devattr,
690 char *buf)
691 {
692 int index = to_sensor_dev_attr(devattr)->index;
693 int status;
694
695 status = i8k_get_fan_status(index);
696 if (status < 0)
697 return -EIO;
698 return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255));
699 }
700
701 static ssize_t i8k_hwmon_set_pwm(struct device *dev,
702 struct device_attribute *attr,
703 const char *buf, size_t count)
704 {
705 int index = to_sensor_dev_attr(attr)->index;
706 unsigned long val;
707 int err;
708
709 err = kstrtoul(buf, 10, &val);
710 if (err)
711 return err;
712 val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max);
713
714 mutex_lock(&i8k_mutex);
715 err = i8k_set_fan(index, val);
716 mutex_unlock(&i8k_mutex);
717
718 return err < 0 ? -EIO : count;
719 }
720
721 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0);
722 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
723 0);
724 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1);
725 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
726 1);
727 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2);
728 static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
729 2);
730 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3);
731 static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
732 3);
733 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 0);
734 static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
735 0);
736 static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
737 i8k_hwmon_set_pwm, 0);
738 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
739 1);
740 static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
741 1);
742 static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
743 i8k_hwmon_set_pwm, 1);
744 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
745 2);
746 static SENSOR_DEVICE_ATTR(fan3_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
747 2);
748 static SENSOR_DEVICE_ATTR(pwm3, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
749 i8k_hwmon_set_pwm, 2);
750
751 static struct attribute *i8k_attrs[] = {
752 &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */
753 &sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */
754 &sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */
755 &sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */
756 &sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */
757 &sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */
758 &sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */
759 &sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */
760 &sensor_dev_attr_fan1_input.dev_attr.attr, /* 8 */
761 &sensor_dev_attr_fan1_label.dev_attr.attr, /* 9 */
762 &sensor_dev_attr_pwm1.dev_attr.attr, /* 10 */
763 &sensor_dev_attr_fan2_input.dev_attr.attr, /* 11 */
764 &sensor_dev_attr_fan2_label.dev_attr.attr, /* 12 */
765 &sensor_dev_attr_pwm2.dev_attr.attr, /* 13 */
766 &sensor_dev_attr_fan3_input.dev_attr.attr, /* 14 */
767 &sensor_dev_attr_fan3_label.dev_attr.attr, /* 15 */
768 &sensor_dev_attr_pwm3.dev_attr.attr, /* 16 */
769 NULL
770 };
771
772 static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
773 int index)
774 {
775 if (disallow_fan_type_call &&
776 (index == 9 || index == 12 || index == 15))
777 return 0;
778 if (index >= 0 && index <= 1 &&
779 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
780 return 0;
781 if (index >= 2 && index <= 3 &&
782 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
783 return 0;
784 if (index >= 4 && index <= 5 &&
785 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
786 return 0;
787 if (index >= 6 && index <= 7 &&
788 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
789 return 0;
790 if (index >= 8 && index <= 10 &&
791 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
792 return 0;
793 if (index >= 11 && index <= 13 &&
794 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
795 return 0;
796 if (index >= 14 && index <= 16 &&
797 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN3))
798 return 0;
799
800 return attr->mode;
801 }
802
803 static const struct attribute_group i8k_group = {
804 .attrs = i8k_attrs,
805 .is_visible = i8k_is_visible,
806 };
807 __ATTRIBUTE_GROUPS(i8k);
808
809 static int __init i8k_init_hwmon(void)
810 {
811 int err;
812
813 i8k_hwmon_flags = 0;
814
815 /* CPU temperature attributes, if temperature type is OK */
816 err = i8k_get_temp_type(0);
817 if (err >= 0)
818 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1;
819 /* check for additional temperature sensors */
820 err = i8k_get_temp_type(1);
821 if (err >= 0)
822 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2;
823 err = i8k_get_temp_type(2);
824 if (err >= 0)
825 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3;
826 err = i8k_get_temp_type(3);
827 if (err >= 0)
828 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
829
830 /* First fan attributes, if fan status or type is OK */
831 err = i8k_get_fan_status(0);
832 if (err < 0)
833 err = i8k_get_fan_type(0);
834 if (err >= 0)
835 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
836
837 /* Second fan attributes, if fan status or type is OK */
838 err = i8k_get_fan_status(1);
839 if (err < 0)
840 err = i8k_get_fan_type(1);
841 if (err >= 0)
842 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
843
844 /* Third fan attributes, if fan status or type is OK */
845 err = i8k_get_fan_status(2);
846 if (err < 0)
847 err = i8k_get_fan_type(2);
848 if (err >= 0)
849 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN3;
850
851 i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm",
852 NULL, i8k_groups);
853 if (IS_ERR(i8k_hwmon_dev)) {
854 err = PTR_ERR(i8k_hwmon_dev);
855 i8k_hwmon_dev = NULL;
856 pr_err("hwmon registration failed (%d)\n", err);
857 return err;
858 }
859 return 0;
860 }
861
862 struct i8k_config_data {
863 uint fan_mult;
864 uint fan_max;
865 };
866
867 enum i8k_configs {
868 DELL_LATITUDE_D520,
869 DELL_PRECISION_490,
870 DELL_STUDIO,
871 DELL_XPS,
872 };
873
874 static const struct i8k_config_data i8k_config_data[] = {
875 [DELL_LATITUDE_D520] = {
876 .fan_mult = 1,
877 .fan_max = I8K_FAN_TURBO,
878 },
879 [DELL_PRECISION_490] = {
880 .fan_mult = 1,
881 .fan_max = I8K_FAN_TURBO,
882 },
883 [DELL_STUDIO] = {
884 .fan_mult = 1,
885 .fan_max = I8K_FAN_HIGH,
886 },
887 [DELL_XPS] = {
888 .fan_mult = 1,
889 .fan_max = I8K_FAN_HIGH,
890 },
891 };
892
893 static const struct dmi_system_id i8k_dmi_table[] __initconst = {
894 {
895 .ident = "Dell Inspiron",
896 .matches = {
897 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
898 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
899 },
900 },
901 {
902 .ident = "Dell Latitude",
903 .matches = {
904 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
905 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
906 },
907 },
908 {
909 .ident = "Dell Inspiron 2",
910 .matches = {
911 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
912 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
913 },
914 },
915 {
916 .ident = "Dell Latitude D520",
917 .matches = {
918 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
919 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"),
920 },
921 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520],
922 },
923 {
924 .ident = "Dell Latitude 2",
925 .matches = {
926 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
927 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
928 },
929 },
930 { /* UK Inspiron 6400 */
931 .ident = "Dell Inspiron 3",
932 .matches = {
933 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
934 DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
935 },
936 },
937 {
938 .ident = "Dell Inspiron 3",
939 .matches = {
940 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
941 DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
942 },
943 },
944 {
945 .ident = "Dell Precision 490",
946 .matches = {
947 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
948 DMI_MATCH(DMI_PRODUCT_NAME,
949 "Precision WorkStation 490"),
950 },
951 .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490],
952 },
953 {
954 .ident = "Dell Precision",
955 .matches = {
956 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
957 DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
958 },
959 },
960 {
961 .ident = "Dell Vostro",
962 .matches = {
963 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
964 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
965 },
966 },
967 {
968 .ident = "Dell XPS421",
969 .matches = {
970 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
971 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
972 },
973 },
974 {
975 .ident = "Dell Studio",
976 .matches = {
977 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
978 DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
979 },
980 .driver_data = (void *)&i8k_config_data[DELL_STUDIO],
981 },
982 {
983 .ident = "Dell XPS 13",
984 .matches = {
985 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
986 DMI_MATCH(DMI_PRODUCT_NAME, "XPS13"),
987 },
988 .driver_data = (void *)&i8k_config_data[DELL_XPS],
989 },
990 {
991 .ident = "Dell XPS M140",
992 .matches = {
993 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
994 DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
995 },
996 .driver_data = (void *)&i8k_config_data[DELL_XPS],
997 },
998 {
999 .ident = "Dell XPS 15 9560",
1000 .matches = {
1001 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1002 DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9560"),
1003 },
1004 },
1005 { }
1006 };
1007
1008 MODULE_DEVICE_TABLE(dmi, i8k_dmi_table);
1009
1010 /*
1011 * On some machines once I8K_SMM_GET_FAN_TYPE is issued then CPU fan speed
1012 * randomly going up and down due to bug in Dell SMM or BIOS. Here is blacklist
1013 * of affected Dell machines for which we disallow I8K_SMM_GET_FAN_TYPE call.
1014 * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121
1015 */
1016 static const struct dmi_system_id i8k_blacklist_fan_type_dmi_table[] __initconst = {
1017 {
1018 .ident = "Dell Studio XPS 8000",
1019 .matches = {
1020 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1021 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000"),
1022 },
1023 },
1024 {
1025 .ident = "Dell Studio XPS 8100",
1026 .matches = {
1027 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1028 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"),
1029 },
1030 },
1031 {
1032 .ident = "Dell Inspiron 580",
1033 .matches = {
1034 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1035 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 580 "),
1036 },
1037 },
1038 { }
1039 };
1040
1041 /*
1042 * Probe for the presence of a supported laptop.
1043 */
1044 static int __init i8k_probe(void)
1045 {
1046 const struct dmi_system_id *id;
1047 int fan, ret;
1048
1049 /*
1050 * Get DMI information
1051 */
1052 if (!dmi_check_system(i8k_dmi_table)) {
1053 if (!ignore_dmi && !force)
1054 return -ENODEV;
1055
1056 pr_info("not running on a supported Dell system.\n");
1057 pr_info("vendor=%s, model=%s, version=%s\n",
1058 i8k_get_dmi_data(DMI_SYS_VENDOR),
1059 i8k_get_dmi_data(DMI_PRODUCT_NAME),
1060 i8k_get_dmi_data(DMI_BIOS_VERSION));
1061 }
1062
1063 if (dmi_check_system(i8k_blacklist_fan_type_dmi_table))
1064 disallow_fan_type_call = true;
1065
1066 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
1067 sizeof(bios_version));
1068 strlcpy(bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
1069 sizeof(bios_machineid));
1070
1071 /*
1072 * Get SMM Dell signature
1073 */
1074 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
1075 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
1076 pr_err("unable to get SMM Dell signature\n");
1077 if (!force)
1078 return -ENODEV;
1079 }
1080
1081 /*
1082 * Set fan multiplier and maximal fan speed from dmi config
1083 * Values specified in module parameters override values from dmi
1084 */
1085 id = dmi_first_match(i8k_dmi_table);
1086 if (id && id->driver_data) {
1087 const struct i8k_config_data *conf = id->driver_data;
1088 if (!fan_mult && conf->fan_mult)
1089 fan_mult = conf->fan_mult;
1090 if (!fan_max && conf->fan_max)
1091 fan_max = conf->fan_max;
1092 }
1093
1094 i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */
1095 i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);
1096
1097 if (!fan_mult) {
1098 /*
1099 * Autodetect fan multiplier based on nominal rpm
1100 * If fan reports rpm value too high then set multiplier to 1
1101 */
1102 for (fan = 0; fan < 2; ++fan) {
1103 ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max);
1104 if (ret < 0)
1105 continue;
1106 if (ret > I8K_FAN_MAX_RPM)
1107 i8k_fan_mult = 1;
1108 break;
1109 }
1110 } else {
1111 /* Fan multiplier was specified in module param or in dmi */
1112 i8k_fan_mult = fan_mult;
1113 }
1114
1115 return 0;
1116 }
1117
1118 static int __init i8k_init(void)
1119 {
1120 int err;
1121
1122 /* Are we running on an supported laptop? */
1123 if (i8k_probe())
1124 return -ENODEV;
1125
1126 err = i8k_init_hwmon();
1127 if (err)
1128 return err;
1129
1130 i8k_init_procfs();
1131 return 0;
1132 }
1133
1134 static void __exit i8k_exit(void)
1135 {
1136 hwmon_device_unregister(i8k_hwmon_dev);
1137 i8k_exit_procfs();
1138 }
1139
1140 module_init(i8k_init);
1141 module_exit(i8k_exit);
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