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hwmon: Rename i8k driver to dell-smm-hwmon and move it to hwmon tree
[deliverable/linux.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/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_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
84 MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
85 MODULE_LICENSE("GPL");
86 MODULE_ALIAS("i8k");
87
88 static bool force;
89 module_param(force, bool, 0);
90 MODULE_PARM_DESC(force, "Force loading without checking for supported models");
91
92 static bool ignore_dmi;
93 module_param(ignore_dmi, bool, 0);
94 MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
95
96 static bool restricted;
97 module_param(restricted, bool, 0);
98 MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
99
100 static bool power_status;
101 module_param(power_status, bool, 0600);
102 MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
103
104 static uint fan_mult;
105 module_param(fan_mult, uint, 0);
106 MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)");
107
108 static uint fan_max;
109 module_param(fan_max, uint, 0);
110 MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)");
111
112 static int i8k_open_fs(struct inode *inode, struct file *file);
113 static long i8k_ioctl(struct file *, unsigned int, unsigned long);
114
115 static const struct file_operations i8k_fops = {
116 .owner = THIS_MODULE,
117 .open = i8k_open_fs,
118 .read = seq_read,
119 .llseek = seq_lseek,
120 .release = single_release,
121 .unlocked_ioctl = i8k_ioctl,
122 };
123
124 struct smm_regs {
125 unsigned int eax;
126 unsigned int ebx __packed;
127 unsigned int ecx __packed;
128 unsigned int edx __packed;
129 unsigned int esi __packed;
130 unsigned int edi __packed;
131 };
132
133 static inline const char *i8k_get_dmi_data(int field)
134 {
135 const char *dmi_data = dmi_get_system_info(field);
136
137 return dmi_data && *dmi_data ? dmi_data : "?";
138 }
139
140 /*
141 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
142 */
143 static int i8k_smm(struct smm_regs *regs)
144 {
145 int rc;
146 int eax = regs->eax;
147 cpumask_var_t old_mask;
148
149 /* SMM requires CPU 0 */
150 if (!alloc_cpumask_var(&old_mask, GFP_KERNEL))
151 return -ENOMEM;
152 cpumask_copy(old_mask, &current->cpus_allowed);
153 rc = set_cpus_allowed_ptr(current, cpumask_of(0));
154 if (rc)
155 goto out;
156 if (smp_processor_id() != 0) {
157 rc = -EBUSY;
158 goto out;
159 }
160
161 #if defined(CONFIG_X86_64)
162 asm volatile("pushq %%rax\n\t"
163 "movl 0(%%rax),%%edx\n\t"
164 "pushq %%rdx\n\t"
165 "movl 4(%%rax),%%ebx\n\t"
166 "movl 8(%%rax),%%ecx\n\t"
167 "movl 12(%%rax),%%edx\n\t"
168 "movl 16(%%rax),%%esi\n\t"
169 "movl 20(%%rax),%%edi\n\t"
170 "popq %%rax\n\t"
171 "out %%al,$0xb2\n\t"
172 "out %%al,$0x84\n\t"
173 "xchgq %%rax,(%%rsp)\n\t"
174 "movl %%ebx,4(%%rax)\n\t"
175 "movl %%ecx,8(%%rax)\n\t"
176 "movl %%edx,12(%%rax)\n\t"
177 "movl %%esi,16(%%rax)\n\t"
178 "movl %%edi,20(%%rax)\n\t"
179 "popq %%rdx\n\t"
180 "movl %%edx,0(%%rax)\n\t"
181 "pushfq\n\t"
182 "popq %%rax\n\t"
183 "andl $1,%%eax\n"
184 : "=a"(rc)
185 : "a"(regs)
186 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
187 #else
188 asm volatile("pushl %%eax\n\t"
189 "movl 0(%%eax),%%edx\n\t"
190 "push %%edx\n\t"
191 "movl 4(%%eax),%%ebx\n\t"
192 "movl 8(%%eax),%%ecx\n\t"
193 "movl 12(%%eax),%%edx\n\t"
194 "movl 16(%%eax),%%esi\n\t"
195 "movl 20(%%eax),%%edi\n\t"
196 "popl %%eax\n\t"
197 "out %%al,$0xb2\n\t"
198 "out %%al,$0x84\n\t"
199 "xchgl %%eax,(%%esp)\n\t"
200 "movl %%ebx,4(%%eax)\n\t"
201 "movl %%ecx,8(%%eax)\n\t"
202 "movl %%edx,12(%%eax)\n\t"
203 "movl %%esi,16(%%eax)\n\t"
204 "movl %%edi,20(%%eax)\n\t"
205 "popl %%edx\n\t"
206 "movl %%edx,0(%%eax)\n\t"
207 "lahf\n\t"
208 "shrl $8,%%eax\n\t"
209 "andl $1,%%eax\n"
210 : "=a"(rc)
211 : "a"(regs)
212 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
213 #endif
214 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
215 rc = -EINVAL;
216
217 out:
218 set_cpus_allowed_ptr(current, old_mask);
219 free_cpumask_var(old_mask);
220 return rc;
221 }
222
223 /*
224 * Read the Fn key status.
225 */
226 static int i8k_get_fn_status(void)
227 {
228 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
229 int rc;
230
231 rc = i8k_smm(&regs);
232 if (rc < 0)
233 return rc;
234
235 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
236 case I8K_FN_UP:
237 return I8K_VOL_UP;
238 case I8K_FN_DOWN:
239 return I8K_VOL_DOWN;
240 case I8K_FN_MUTE:
241 return I8K_VOL_MUTE;
242 default:
243 return 0;
244 }
245 }
246
247 /*
248 * Read the power status.
249 */
250 static int i8k_get_power_status(void)
251 {
252 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
253 int rc;
254
255 rc = i8k_smm(&regs);
256 if (rc < 0)
257 return rc;
258
259 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
260 }
261
262 /*
263 * Read the fan status.
264 */
265 static int i8k_get_fan_status(int fan)
266 {
267 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
268
269 regs.ebx = fan & 0xff;
270 return i8k_smm(&regs) ? : regs.eax & 0xff;
271 }
272
273 /*
274 * Read the fan speed in RPM.
275 */
276 static int i8k_get_fan_speed(int fan)
277 {
278 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
279
280 regs.ebx = fan & 0xff;
281 return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
282 }
283
284 /*
285 * Read the fan type.
286 */
287 static int i8k_get_fan_type(int fan)
288 {
289 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, };
290
291 regs.ebx = fan & 0xff;
292 return i8k_smm(&regs) ? : regs.eax & 0xff;
293 }
294
295 /*
296 * Read the fan nominal rpm for specific fan speed.
297 */
298 static int i8k_get_fan_nominal_speed(int fan, int speed)
299 {
300 struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, };
301
302 regs.ebx = (fan & 0xff) | (speed << 8);
303 return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
304 }
305
306 /*
307 * Set the fan speed (off, low, high). Returns the new fan status.
308 */
309 static int i8k_set_fan(int fan, int speed)
310 {
311 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
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 static int
382 i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
383 {
384 int val = 0;
385 int speed;
386 unsigned char buff[16];
387 int __user *argp = (int __user *)arg;
388
389 if (!argp)
390 return -EINVAL;
391
392 switch (cmd) {
393 case I8K_BIOS_VERSION:
394 val = (bios_version[0] << 16) |
395 (bios_version[1] << 8) | bios_version[2];
396 break;
397
398 case I8K_MACHINE_ID:
399 memset(buff, 0, 16);
400 strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
401 sizeof(buff));
402 break;
403
404 case I8K_FN_STATUS:
405 val = i8k_get_fn_status();
406 break;
407
408 case I8K_POWER_STATUS:
409 val = i8k_get_power_status();
410 break;
411
412 case I8K_GET_TEMP:
413 val = i8k_get_temp(0);
414 break;
415
416 case I8K_GET_SPEED:
417 if (copy_from_user(&val, argp, sizeof(int)))
418 return -EFAULT;
419
420 val = i8k_get_fan_speed(val);
421 break;
422
423 case I8K_GET_FAN:
424 if (copy_from_user(&val, argp, sizeof(int)))
425 return -EFAULT;
426
427 val = i8k_get_fan_status(val);
428 break;
429
430 case I8K_SET_FAN:
431 if (restricted && !capable(CAP_SYS_ADMIN))
432 return -EPERM;
433
434 if (copy_from_user(&val, argp, sizeof(int)))
435 return -EFAULT;
436
437 if (copy_from_user(&speed, argp + 1, sizeof(int)))
438 return -EFAULT;
439
440 val = i8k_set_fan(val, speed);
441 break;
442
443 default:
444 return -EINVAL;
445 }
446
447 if (val < 0)
448 return val;
449
450 switch (cmd) {
451 case I8K_BIOS_VERSION:
452 if (copy_to_user(argp, &val, 4))
453 return -EFAULT;
454
455 break;
456 case I8K_MACHINE_ID:
457 if (copy_to_user(argp, buff, 16))
458 return -EFAULT;
459
460 break;
461 default:
462 if (copy_to_user(argp, &val, sizeof(int)))
463 return -EFAULT;
464
465 break;
466 }
467
468 return 0;
469 }
470
471 static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
472 {
473 long ret;
474
475 mutex_lock(&i8k_mutex);
476 ret = i8k_ioctl_unlocked(fp, cmd, arg);
477 mutex_unlock(&i8k_mutex);
478
479 return ret;
480 }
481
482 /*
483 * Print the information for /proc/i8k.
484 */
485 static int i8k_proc_show(struct seq_file *seq, void *offset)
486 {
487 int fn_key, cpu_temp, ac_power;
488 int left_fan, right_fan, left_speed, right_speed;
489
490 cpu_temp = i8k_get_temp(0); /* 11100 µs */
491 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */
492 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */
493 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */
494 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */
495 fn_key = i8k_get_fn_status(); /* 750 µs */
496 if (power_status)
497 ac_power = i8k_get_power_status(); /* 14700 µs */
498 else
499 ac_power = -1;
500
501 /*
502 * Info:
503 *
504 * 1) Format version (this will change if format changes)
505 * 2) BIOS version
506 * 3) BIOS machine ID
507 * 4) Cpu temperature
508 * 5) Left fan status
509 * 6) Right fan status
510 * 7) Left fan speed
511 * 8) Right fan speed
512 * 9) AC power
513 * 10) Fn Key status
514 */
515 seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
516 I8K_PROC_FMT,
517 bios_version,
518 i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
519 cpu_temp,
520 left_fan, right_fan, left_speed, right_speed,
521 ac_power, fn_key);
522
523 return 0;
524 }
525
526 static int i8k_open_fs(struct inode *inode, struct file *file)
527 {
528 return single_open(file, i8k_proc_show, NULL);
529 }
530
531
532 /*
533 * Hwmon interface
534 */
535
536 static ssize_t i8k_hwmon_show_temp_label(struct device *dev,
537 struct device_attribute *devattr,
538 char *buf)
539 {
540 static const char * const labels[] = {
541 "CPU",
542 "GPU",
543 "SODIMM",
544 "Other",
545 "Ambient",
546 "Other",
547 };
548 int index = to_sensor_dev_attr(devattr)->index;
549 int type;
550
551 type = i8k_get_temp_type(index);
552 if (type < 0)
553 return type;
554 if (type >= ARRAY_SIZE(labels))
555 type = ARRAY_SIZE(labels) - 1;
556 return sprintf(buf, "%s\n", labels[type]);
557 }
558
559 static ssize_t i8k_hwmon_show_temp(struct device *dev,
560 struct device_attribute *devattr,
561 char *buf)
562 {
563 int index = to_sensor_dev_attr(devattr)->index;
564 int temp;
565
566 temp = i8k_get_temp(index);
567 if (temp < 0)
568 return temp;
569 return sprintf(buf, "%d\n", temp * 1000);
570 }
571
572 static ssize_t i8k_hwmon_show_fan_label(struct device *dev,
573 struct device_attribute *devattr,
574 char *buf)
575 {
576 static const char * const labels[] = {
577 "Processor Fan",
578 "Motherboard Fan",
579 "Video Fan",
580 "Power Supply Fan",
581 "Chipset Fan",
582 "Other Fan",
583 };
584 int index = to_sensor_dev_attr(devattr)->index;
585 bool dock = false;
586 int type;
587
588 type = i8k_get_fan_type(index);
589 if (type < 0)
590 return type;
591
592 if (type & 0x10) {
593 dock = true;
594 type &= 0x0F;
595 }
596
597 if (type >= ARRAY_SIZE(labels))
598 type = (ARRAY_SIZE(labels) - 1);
599
600 return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]);
601 }
602
603 static ssize_t i8k_hwmon_show_fan(struct device *dev,
604 struct device_attribute *devattr,
605 char *buf)
606 {
607 int index = to_sensor_dev_attr(devattr)->index;
608 int fan_speed;
609
610 fan_speed = i8k_get_fan_speed(index);
611 if (fan_speed < 0)
612 return fan_speed;
613 return sprintf(buf, "%d\n", fan_speed);
614 }
615
616 static ssize_t i8k_hwmon_show_pwm(struct device *dev,
617 struct device_attribute *devattr,
618 char *buf)
619 {
620 int index = to_sensor_dev_attr(devattr)->index;
621 int status;
622
623 status = i8k_get_fan_status(index);
624 if (status < 0)
625 return -EIO;
626 return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255));
627 }
628
629 static ssize_t i8k_hwmon_set_pwm(struct device *dev,
630 struct device_attribute *attr,
631 const char *buf, size_t count)
632 {
633 int index = to_sensor_dev_attr(attr)->index;
634 unsigned long val;
635 int err;
636
637 err = kstrtoul(buf, 10, &val);
638 if (err)
639 return err;
640 val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max);
641
642 mutex_lock(&i8k_mutex);
643 err = i8k_set_fan(index, val);
644 mutex_unlock(&i8k_mutex);
645
646 return err < 0 ? -EIO : count;
647 }
648
649 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0);
650 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
651 0);
652 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1);
653 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
654 1);
655 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2);
656 static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
657 2);
658 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3);
659 static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
660 3);
661 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 0);
662 static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
663 0);
664 static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
665 i8k_hwmon_set_pwm, 0);
666 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
667 1);
668 static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
669 1);
670 static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
671 i8k_hwmon_set_pwm, 1);
672
673 static struct attribute *i8k_attrs[] = {
674 &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */
675 &sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */
676 &sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */
677 &sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */
678 &sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */
679 &sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */
680 &sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */
681 &sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */
682 &sensor_dev_attr_fan1_input.dev_attr.attr, /* 8 */
683 &sensor_dev_attr_fan1_label.dev_attr.attr, /* 9 */
684 &sensor_dev_attr_pwm1.dev_attr.attr, /* 10 */
685 &sensor_dev_attr_fan2_input.dev_attr.attr, /* 11 */
686 &sensor_dev_attr_fan2_label.dev_attr.attr, /* 12 */
687 &sensor_dev_attr_pwm2.dev_attr.attr, /* 13 */
688 NULL
689 };
690
691 static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
692 int index)
693 {
694 if (index >= 0 && index <= 1 &&
695 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
696 return 0;
697 if (index >= 2 && index <= 3 &&
698 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
699 return 0;
700 if (index >= 4 && index <= 5 &&
701 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
702 return 0;
703 if (index >= 6 && index <= 7 &&
704 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
705 return 0;
706 if (index >= 8 && index <= 10 &&
707 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
708 return 0;
709 if (index >= 11 && index <= 13 &&
710 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
711 return 0;
712
713 return attr->mode;
714 }
715
716 static const struct attribute_group i8k_group = {
717 .attrs = i8k_attrs,
718 .is_visible = i8k_is_visible,
719 };
720 __ATTRIBUTE_GROUPS(i8k);
721
722 static int __init i8k_init_hwmon(void)
723 {
724 int err;
725
726 i8k_hwmon_flags = 0;
727
728 /* CPU temperature attributes, if temperature type is OK */
729 err = i8k_get_temp_type(0);
730 if (err >= 0)
731 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1;
732 /* check for additional temperature sensors */
733 err = i8k_get_temp_type(1);
734 if (err >= 0)
735 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2;
736 err = i8k_get_temp_type(2);
737 if (err >= 0)
738 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3;
739 err = i8k_get_temp_type(3);
740 if (err >= 0)
741 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
742
743 /* First fan attributes, if fan type is OK */
744 err = i8k_get_fan_type(0);
745 if (err >= 0)
746 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
747
748 /* Second fan attributes, if fan type is OK */
749 err = i8k_get_fan_type(1);
750 if (err >= 0)
751 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
752
753 i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "i8k", NULL,
754 i8k_groups);
755 if (IS_ERR(i8k_hwmon_dev)) {
756 err = PTR_ERR(i8k_hwmon_dev);
757 i8k_hwmon_dev = NULL;
758 pr_err("hwmon registration failed (%d)\n", err);
759 return err;
760 }
761 return 0;
762 }
763
764 struct i8k_config_data {
765 uint fan_mult;
766 uint fan_max;
767 };
768
769 enum i8k_configs {
770 DELL_LATITUDE_D520,
771 DELL_PRECISION_490,
772 DELL_STUDIO,
773 DELL_XPS,
774 };
775
776 static const struct i8k_config_data i8k_config_data[] = {
777 [DELL_LATITUDE_D520] = {
778 .fan_mult = 1,
779 .fan_max = I8K_FAN_TURBO,
780 },
781 [DELL_PRECISION_490] = {
782 .fan_mult = 1,
783 .fan_max = I8K_FAN_TURBO,
784 },
785 [DELL_STUDIO] = {
786 .fan_mult = 1,
787 .fan_max = I8K_FAN_HIGH,
788 },
789 [DELL_XPS] = {
790 .fan_mult = 1,
791 .fan_max = I8K_FAN_HIGH,
792 },
793 };
794
795 static struct dmi_system_id i8k_dmi_table[] __initdata = {
796 {
797 .ident = "Dell Inspiron",
798 .matches = {
799 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
800 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
801 },
802 },
803 {
804 .ident = "Dell Latitude",
805 .matches = {
806 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
807 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
808 },
809 },
810 {
811 .ident = "Dell Inspiron 2",
812 .matches = {
813 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
814 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
815 },
816 },
817 {
818 .ident = "Dell Latitude D520",
819 .matches = {
820 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
821 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"),
822 },
823 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520],
824 },
825 {
826 .ident = "Dell Latitude 2",
827 .matches = {
828 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
829 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
830 },
831 },
832 { /* UK Inspiron 6400 */
833 .ident = "Dell Inspiron 3",
834 .matches = {
835 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
836 DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
837 },
838 },
839 {
840 .ident = "Dell Inspiron 3",
841 .matches = {
842 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
843 DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
844 },
845 },
846 {
847 .ident = "Dell Precision 490",
848 .matches = {
849 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
850 DMI_MATCH(DMI_PRODUCT_NAME,
851 "Precision WorkStation 490"),
852 },
853 .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490],
854 },
855 {
856 .ident = "Dell Precision",
857 .matches = {
858 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
859 DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
860 },
861 },
862 {
863 .ident = "Dell Vostro",
864 .matches = {
865 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
866 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
867 },
868 },
869 {
870 .ident = "Dell XPS421",
871 .matches = {
872 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
873 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
874 },
875 },
876 {
877 .ident = "Dell Studio",
878 .matches = {
879 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
880 DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
881 },
882 .driver_data = (void *)&i8k_config_data[DELL_STUDIO],
883 },
884 {
885 .ident = "Dell XPS 13",
886 .matches = {
887 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
888 DMI_MATCH(DMI_PRODUCT_NAME, "XPS13"),
889 },
890 .driver_data = (void *)&i8k_config_data[DELL_XPS],
891 },
892 {
893 .ident = "Dell XPS M140",
894 .matches = {
895 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
896 DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
897 },
898 .driver_data = (void *)&i8k_config_data[DELL_XPS],
899 },
900 { }
901 };
902
903 MODULE_DEVICE_TABLE(dmi, i8k_dmi_table);
904
905 /*
906 * Probe for the presence of a supported laptop.
907 */
908 static int __init i8k_probe(void)
909 {
910 const struct dmi_system_id *id;
911 int fan, ret;
912
913 /*
914 * Get DMI information
915 */
916 if (!dmi_check_system(i8k_dmi_table)) {
917 if (!ignore_dmi && !force)
918 return -ENODEV;
919
920 pr_info("not running on a supported Dell system.\n");
921 pr_info("vendor=%s, model=%s, version=%s\n",
922 i8k_get_dmi_data(DMI_SYS_VENDOR),
923 i8k_get_dmi_data(DMI_PRODUCT_NAME),
924 i8k_get_dmi_data(DMI_BIOS_VERSION));
925 }
926
927 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
928 sizeof(bios_version));
929
930 /*
931 * Get SMM Dell signature
932 */
933 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
934 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
935 pr_err("unable to get SMM Dell signature\n");
936 if (!force)
937 return -ENODEV;
938 }
939
940 /*
941 * Set fan multiplier and maximal fan speed from dmi config
942 * Values specified in module parameters override values from dmi
943 */
944 id = dmi_first_match(i8k_dmi_table);
945 if (id && id->driver_data) {
946 const struct i8k_config_data *conf = id->driver_data;
947 if (!fan_mult && conf->fan_mult)
948 fan_mult = conf->fan_mult;
949 if (!fan_max && conf->fan_max)
950 fan_max = conf->fan_max;
951 }
952
953 i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */
954 i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);
955
956 if (!fan_mult) {
957 /*
958 * Autodetect fan multiplier based on nominal rpm
959 * If fan reports rpm value too high then set multiplier to 1
960 */
961 for (fan = 0; fan < 2; ++fan) {
962 ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max);
963 if (ret < 0)
964 continue;
965 if (ret > I8K_FAN_MAX_RPM)
966 i8k_fan_mult = 1;
967 break;
968 }
969 } else {
970 /* Fan multiplier was specified in module param or in dmi */
971 i8k_fan_mult = fan_mult;
972 }
973
974 return 0;
975 }
976
977 static int __init i8k_init(void)
978 {
979 struct proc_dir_entry *proc_i8k;
980 int err;
981
982 /* Are we running on an supported laptop? */
983 if (i8k_probe())
984 return -ENODEV;
985
986 /* Register the proc entry */
987 proc_i8k = proc_create("i8k", 0, NULL, &i8k_fops);
988 if (!proc_i8k)
989 return -ENOENT;
990
991 err = i8k_init_hwmon();
992 if (err)
993 goto exit_remove_proc;
994
995 return 0;
996
997 exit_remove_proc:
998 remove_proc_entry("i8k", NULL);
999 return err;
1000 }
1001
1002 static void __exit i8k_exit(void)
1003 {
1004 hwmon_device_unregister(i8k_hwmon_dev);
1005 remove_proc_entry("i8k", NULL);
1006 }
1007
1008 module_init(i8k_init);
1009 module_exit(i8k_exit);
Linux kernel - Deliverables
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