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i8k: Register only temperature sensors which have labels
[deliverable/linux.git] / drivers / char / i8k.c
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 Guenter Roeck <linux@roeck-us.net>
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2, or (at your option) any
13 * later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 */
20
21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23 #include <linux/module.h>
24 #include <linux/types.h>
25 #include <linux/init.h>
26 #include <linux/proc_fs.h>
27 #include <linux/seq_file.h>
28 #include <linux/dmi.h>
29 #include <linux/capability.h>
30 #include <linux/mutex.h>
31 #include <linux/hwmon.h>
32 #include <linux/hwmon-sysfs.h>
33 #include <linux/uaccess.h>
34 #include <linux/io.h>
35 #include <linux/sched.h>
36
37 #include <linux/i8k.h>
38
39 #define I8K_SMM_FN_STATUS 0x0025
40 #define I8K_SMM_POWER_STATUS 0x0069
41 #define I8K_SMM_SET_FAN 0x01a3
42 #define I8K_SMM_GET_FAN 0x00a3
43 #define I8K_SMM_GET_SPEED 0x02a3
44 #define I8K_SMM_GET_TEMP 0x10a3
45 #define I8K_SMM_GET_TEMP_TYPE 0x11a3
46 #define I8K_SMM_GET_DELL_SIG1 0xfea3
47 #define I8K_SMM_GET_DELL_SIG2 0xffa3
48
49 #define I8K_FAN_MULT 30
50 #define I8K_MAX_TEMP 127
51
52 #define I8K_FN_NONE 0x00
53 #define I8K_FN_UP 0x01
54 #define I8K_FN_DOWN 0x02
55 #define I8K_FN_MUTE 0x04
56 #define I8K_FN_MASK 0x07
57 #define I8K_FN_SHIFT 8
58
59 #define I8K_POWER_AC 0x05
60 #define I8K_POWER_BATTERY 0x01
61
62 #define I8K_TEMPERATURE_BUG 1
63
64 static DEFINE_MUTEX(i8k_mutex);
65 static char bios_version[4];
66 static struct device *i8k_hwmon_dev;
67 static u32 i8k_hwmon_flags;
68 static int i8k_fan_mult;
69 static int i8k_pwm_mult;
70 static int i8k_fan_max = I8K_FAN_HIGH;
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_FAN1 (1 << 4)
77 #define I8K_HWMON_HAVE_FAN2 (1 << 5)
78
79 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
80 MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
81 MODULE_LICENSE("GPL");
82
83 static bool force;
84 module_param(force, bool, 0);
85 MODULE_PARM_DESC(force, "Force loading without checking for supported models");
86
87 static bool ignore_dmi;
88 module_param(ignore_dmi, bool, 0);
89 MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
90
91 static bool restricted;
92 module_param(restricted, bool, 0);
93 MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
94
95 static bool power_status;
96 module_param(power_status, bool, 0600);
97 MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
98
99 static int fan_mult = I8K_FAN_MULT;
100 module_param(fan_mult, int, 0);
101 MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with");
102
103 static int fan_max = I8K_FAN_HIGH;
104 module_param(fan_max, int, 0);
105 MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed");
106
107 static int i8k_open_fs(struct inode *inode, struct file *file);
108 static long i8k_ioctl(struct file *, unsigned int, unsigned long);
109
110 static const struct file_operations i8k_fops = {
111 .owner = THIS_MODULE,
112 .open = i8k_open_fs,
113 .read = seq_read,
114 .llseek = seq_lseek,
115 .release = single_release,
116 .unlocked_ioctl = i8k_ioctl,
117 };
118
119 struct smm_regs {
120 unsigned int eax;
121 unsigned int ebx __packed;
122 unsigned int ecx __packed;
123 unsigned int edx __packed;
124 unsigned int esi __packed;
125 unsigned int edi __packed;
126 };
127
128 static inline const char *i8k_get_dmi_data(int field)
129 {
130 const char *dmi_data = dmi_get_system_info(field);
131
132 return dmi_data && *dmi_data ? dmi_data : "?";
133 }
134
135 /*
136 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
137 */
138 static int i8k_smm(struct smm_regs *regs)
139 {
140 int rc;
141 int eax = regs->eax;
142 cpumask_var_t old_mask;
143
144 /* SMM requires CPU 0 */
145 if (!alloc_cpumask_var(&old_mask, GFP_KERNEL))
146 return -ENOMEM;
147 cpumask_copy(old_mask, &current->cpus_allowed);
148 rc = set_cpus_allowed_ptr(current, cpumask_of(0));
149 if (rc)
150 goto out;
151 if (smp_processor_id() != 0) {
152 rc = -EBUSY;
153 goto out;
154 }
155
156 #if defined(CONFIG_X86_64)
157 asm volatile("pushq %%rax\n\t"
158 "movl 0(%%rax),%%edx\n\t"
159 "pushq %%rdx\n\t"
160 "movl 4(%%rax),%%ebx\n\t"
161 "movl 8(%%rax),%%ecx\n\t"
162 "movl 12(%%rax),%%edx\n\t"
163 "movl 16(%%rax),%%esi\n\t"
164 "movl 20(%%rax),%%edi\n\t"
165 "popq %%rax\n\t"
166 "out %%al,$0xb2\n\t"
167 "out %%al,$0x84\n\t"
168 "xchgq %%rax,(%%rsp)\n\t"
169 "movl %%ebx,4(%%rax)\n\t"
170 "movl %%ecx,8(%%rax)\n\t"
171 "movl %%edx,12(%%rax)\n\t"
172 "movl %%esi,16(%%rax)\n\t"
173 "movl %%edi,20(%%rax)\n\t"
174 "popq %%rdx\n\t"
175 "movl %%edx,0(%%rax)\n\t"
176 "pushfq\n\t"
177 "popq %%rax\n\t"
178 "andl $1,%%eax\n"
179 : "=a"(rc)
180 : "a"(regs)
181 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
182 #else
183 asm volatile("pushl %%eax\n\t"
184 "movl 0(%%eax),%%edx\n\t"
185 "push %%edx\n\t"
186 "movl 4(%%eax),%%ebx\n\t"
187 "movl 8(%%eax),%%ecx\n\t"
188 "movl 12(%%eax),%%edx\n\t"
189 "movl 16(%%eax),%%esi\n\t"
190 "movl 20(%%eax),%%edi\n\t"
191 "popl %%eax\n\t"
192 "out %%al,$0xb2\n\t"
193 "out %%al,$0x84\n\t"
194 "xchgl %%eax,(%%esp)\n\t"
195 "movl %%ebx,4(%%eax)\n\t"
196 "movl %%ecx,8(%%eax)\n\t"
197 "movl %%edx,12(%%eax)\n\t"
198 "movl %%esi,16(%%eax)\n\t"
199 "movl %%edi,20(%%eax)\n\t"
200 "popl %%edx\n\t"
201 "movl %%edx,0(%%eax)\n\t"
202 "lahf\n\t"
203 "shrl $8,%%eax\n\t"
204 "andl $1,%%eax\n"
205 : "=a"(rc)
206 : "a"(regs)
207 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
208 #endif
209 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
210 rc = -EINVAL;
211
212 out:
213 set_cpus_allowed_ptr(current, old_mask);
214 free_cpumask_var(old_mask);
215 return rc;
216 }
217
218 /*
219 * Read the Fn key status.
220 */
221 static int i8k_get_fn_status(void)
222 {
223 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
224 int rc;
225
226 rc = i8k_smm(&regs);
227 if (rc < 0)
228 return rc;
229
230 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
231 case I8K_FN_UP:
232 return I8K_VOL_UP;
233 case I8K_FN_DOWN:
234 return I8K_VOL_DOWN;
235 case I8K_FN_MUTE:
236 return I8K_VOL_MUTE;
237 default:
238 return 0;
239 }
240 }
241
242 /*
243 * Read the power status.
244 */
245 static int i8k_get_power_status(void)
246 {
247 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
248 int rc;
249
250 rc = i8k_smm(&regs);
251 if (rc < 0)
252 return rc;
253
254 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
255 }
256
257 /*
258 * Read the fan status.
259 */
260 static int i8k_get_fan_status(int fan)
261 {
262 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
263
264 regs.ebx = fan & 0xff;
265 return i8k_smm(&regs) ? : regs.eax & 0xff;
266 }
267
268 /*
269 * Read the fan speed in RPM.
270 */
271 static int i8k_get_fan_speed(int fan)
272 {
273 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
274
275 regs.ebx = fan & 0xff;
276 return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
277 }
278
279 /*
280 * Set the fan speed (off, low, high). Returns the new fan status.
281 */
282 static int i8k_set_fan(int fan, int speed)
283 {
284 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
285
286 speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed);
287 regs.ebx = (fan & 0xff) | (speed << 8);
288
289 return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
290 }
291
292 static int i8k_get_temp_type(int sensor)
293 {
294 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, };
295
296 regs.ebx = sensor & 0xff;
297 return i8k_smm(&regs) ? : regs.eax & 0xff;
298 }
299
300 /*
301 * Read the cpu temperature.
302 */
303 static int i8k_get_temp(int sensor)
304 {
305 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, };
306 int rc;
307 int temp;
308
309 #ifdef I8K_TEMPERATURE_BUG
310 static int prev[4] = { I8K_MAX_TEMP+1, I8K_MAX_TEMP+1, I8K_MAX_TEMP+1, I8K_MAX_TEMP+1 };
311 #endif
312 regs.ebx = sensor & 0xff;
313 rc = i8k_smm(&regs);
314 if (rc < 0)
315 return rc;
316
317 temp = regs.eax & 0xff;
318
319 #ifdef I8K_TEMPERATURE_BUG
320 /*
321 * Sometimes the temperature sensor returns 0x99, which is out of range.
322 * In this case we return (once) the previous cached value. For example:
323 # 1003655137 00000058 00005a4b
324 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
325 # 1003655139 00000054 00005c52
326 */
327 if (temp > I8K_MAX_TEMP) {
328 temp = prev[sensor];
329 prev[sensor] = I8K_MAX_TEMP+1;
330 } else {
331 prev[sensor] = temp;
332 }
333 if (temp > I8K_MAX_TEMP)
334 return -ERANGE;
335 #endif
336
337 return temp;
338 }
339
340 static int i8k_get_dell_signature(int req_fn)
341 {
342 struct smm_regs regs = { .eax = req_fn, };
343 int rc;
344
345 rc = i8k_smm(&regs);
346 if (rc < 0)
347 return rc;
348
349 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
350 }
351
352 static int
353 i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
354 {
355 int val = 0;
356 int speed;
357 unsigned char buff[16];
358 int __user *argp = (int __user *)arg;
359
360 if (!argp)
361 return -EINVAL;
362
363 switch (cmd) {
364 case I8K_BIOS_VERSION:
365 val = (bios_version[0] << 16) |
366 (bios_version[1] << 8) | bios_version[2];
367 break;
368
369 case I8K_MACHINE_ID:
370 memset(buff, 0, 16);
371 strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
372 sizeof(buff));
373 break;
374
375 case I8K_FN_STATUS:
376 val = i8k_get_fn_status();
377 break;
378
379 case I8K_POWER_STATUS:
380 val = i8k_get_power_status();
381 break;
382
383 case I8K_GET_TEMP:
384 val = i8k_get_temp(0);
385 break;
386
387 case I8K_GET_SPEED:
388 if (copy_from_user(&val, argp, sizeof(int)))
389 return -EFAULT;
390
391 val = i8k_get_fan_speed(val);
392 break;
393
394 case I8K_GET_FAN:
395 if (copy_from_user(&val, argp, sizeof(int)))
396 return -EFAULT;
397
398 val = i8k_get_fan_status(val);
399 break;
400
401 case I8K_SET_FAN:
402 if (restricted && !capable(CAP_SYS_ADMIN))
403 return -EPERM;
404
405 if (copy_from_user(&val, argp, sizeof(int)))
406 return -EFAULT;
407
408 if (copy_from_user(&speed, argp + 1, sizeof(int)))
409 return -EFAULT;
410
411 val = i8k_set_fan(val, speed);
412 break;
413
414 default:
415 return -EINVAL;
416 }
417
418 if (val < 0)
419 return val;
420
421 switch (cmd) {
422 case I8K_BIOS_VERSION:
423 if (copy_to_user(argp, &val, 4))
424 return -EFAULT;
425
426 break;
427 case I8K_MACHINE_ID:
428 if (copy_to_user(argp, buff, 16))
429 return -EFAULT;
430
431 break;
432 default:
433 if (copy_to_user(argp, &val, sizeof(int)))
434 return -EFAULT;
435
436 break;
437 }
438
439 return 0;
440 }
441
442 static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
443 {
444 long ret;
445
446 mutex_lock(&i8k_mutex);
447 ret = i8k_ioctl_unlocked(fp, cmd, arg);
448 mutex_unlock(&i8k_mutex);
449
450 return ret;
451 }
452
453 /*
454 * Print the information for /proc/i8k.
455 */
456 static int i8k_proc_show(struct seq_file *seq, void *offset)
457 {
458 int fn_key, cpu_temp, ac_power;
459 int left_fan, right_fan, left_speed, right_speed;
460
461 cpu_temp = i8k_get_temp(0); /* 11100 µs */
462 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */
463 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */
464 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */
465 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */
466 fn_key = i8k_get_fn_status(); /* 750 µs */
467 if (power_status)
468 ac_power = i8k_get_power_status(); /* 14700 µs */
469 else
470 ac_power = -1;
471
472 /*
473 * Info:
474 *
475 * 1) Format version (this will change if format changes)
476 * 2) BIOS version
477 * 3) BIOS machine ID
478 * 4) Cpu temperature
479 * 5) Left fan status
480 * 6) Right fan status
481 * 7) Left fan speed
482 * 8) Right fan speed
483 * 9) AC power
484 * 10) Fn Key status
485 */
486 return seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
487 I8K_PROC_FMT,
488 bios_version,
489 i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
490 cpu_temp,
491 left_fan, right_fan, left_speed, right_speed,
492 ac_power, fn_key);
493 }
494
495 static int i8k_open_fs(struct inode *inode, struct file *file)
496 {
497 return single_open(file, i8k_proc_show, NULL);
498 }
499
500
501 /*
502 * Hwmon interface
503 */
504
505 static ssize_t i8k_hwmon_show_temp_label(struct device *dev,
506 struct device_attribute *devattr,
507 char *buf)
508 {
509 static const char * const labels[] = {
510 "CPU",
511 "GPU",
512 "SODIMM",
513 "Other",
514 "Ambient",
515 "Other",
516 };
517 int index = to_sensor_dev_attr(devattr)->index;
518 int type;
519
520 type = i8k_get_temp_type(index);
521 if (type < 0)
522 return type;
523 if (type >= ARRAY_SIZE(labels))
524 type = ARRAY_SIZE(labels) - 1;
525 return sprintf(buf, "%s\n", labels[type]);
526 }
527
528 static ssize_t i8k_hwmon_show_temp(struct device *dev,
529 struct device_attribute *devattr,
530 char *buf)
531 {
532 int index = to_sensor_dev_attr(devattr)->index;
533 int temp;
534
535 temp = i8k_get_temp(index);
536 if (temp == -ERANGE)
537 return -EINVAL;
538 if (temp < 0)
539 return temp;
540 return sprintf(buf, "%d\n", temp * 1000);
541 }
542
543 static ssize_t i8k_hwmon_show_fan(struct device *dev,
544 struct device_attribute *devattr,
545 char *buf)
546 {
547 int index = to_sensor_dev_attr(devattr)->index;
548 int fan_speed;
549
550 fan_speed = i8k_get_fan_speed(index);
551 if (fan_speed < 0)
552 return fan_speed;
553 return sprintf(buf, "%d\n", fan_speed);
554 }
555
556 static ssize_t i8k_hwmon_show_pwm(struct device *dev,
557 struct device_attribute *devattr,
558 char *buf)
559 {
560 int index = to_sensor_dev_attr(devattr)->index;
561 int status;
562
563 status = i8k_get_fan_status(index);
564 if (status < 0)
565 return -EIO;
566 return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255));
567 }
568
569 static ssize_t i8k_hwmon_set_pwm(struct device *dev,
570 struct device_attribute *attr,
571 const char *buf, size_t count)
572 {
573 int index = to_sensor_dev_attr(attr)->index;
574 unsigned long val;
575 int err;
576
577 err = kstrtoul(buf, 10, &val);
578 if (err)
579 return err;
580 val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max);
581
582 mutex_lock(&i8k_mutex);
583 err = i8k_set_fan(index, val);
584 mutex_unlock(&i8k_mutex);
585
586 return err < 0 ? -EIO : count;
587 }
588
589 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0);
590 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
591 0);
592 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1);
593 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
594 1);
595 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2);
596 static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
597 2);
598 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3);
599 static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
600 3);
601 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
602 I8K_FAN_LEFT);
603 static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
604 i8k_hwmon_set_pwm, I8K_FAN_LEFT);
605 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
606 I8K_FAN_RIGHT);
607 static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
608 i8k_hwmon_set_pwm, I8K_FAN_RIGHT);
609
610 static struct attribute *i8k_attrs[] = {
611 &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */
612 &sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */
613 &sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */
614 &sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */
615 &sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */
616 &sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */
617 &sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */
618 &sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */
619 &sensor_dev_attr_fan1_input.dev_attr.attr, /* 8 */
620 &sensor_dev_attr_pwm1.dev_attr.attr, /* 9 */
621 &sensor_dev_attr_fan2_input.dev_attr.attr, /* 10 */
622 &sensor_dev_attr_pwm2.dev_attr.attr, /* 11 */
623 NULL
624 };
625
626 static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
627 int index)
628 {
629 if (index >= 0 && index <= 1 &&
630 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
631 return 0;
632 if (index >= 2 && index <= 3 &&
633 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
634 return 0;
635 if (index >= 4 && index <= 5 &&
636 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
637 return 0;
638 if (index >= 6 && index <= 7 &&
639 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
640 return 0;
641 if (index >= 8 && index <= 9 &&
642 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
643 return 0;
644 if (index >= 10 && index <= 11 &&
645 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
646 return 0;
647
648 return attr->mode;
649 }
650
651 static const struct attribute_group i8k_group = {
652 .attrs = i8k_attrs,
653 .is_visible = i8k_is_visible,
654 };
655 __ATTRIBUTE_GROUPS(i8k);
656
657 static int __init i8k_init_hwmon(void)
658 {
659 int err;
660
661 i8k_hwmon_flags = 0;
662
663 /* CPU temperature attributes, if temperature type is OK */
664 err = i8k_get_temp_type(0);
665 if (err >= 0)
666 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1;
667 /* check for additional temperature sensors */
668 err = i8k_get_temp_type(1);
669 if (err >= 0)
670 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2;
671 err = i8k_get_temp_type(2);
672 if (err >= 0)
673 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3;
674 err = i8k_get_temp_type(3);
675 if (err >= 0)
676 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
677
678 /* Left fan attributes, if left fan is present */
679 err = i8k_get_fan_status(I8K_FAN_LEFT);
680 if (err >= 0)
681 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
682
683 /* Right fan attributes, if right fan is present */
684 err = i8k_get_fan_status(I8K_FAN_RIGHT);
685 if (err >= 0)
686 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
687
688 i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "i8k", NULL,
689 i8k_groups);
690 if (IS_ERR(i8k_hwmon_dev)) {
691 err = PTR_ERR(i8k_hwmon_dev);
692 i8k_hwmon_dev = NULL;
693 pr_err("hwmon registration failed (%d)\n", err);
694 return err;
695 }
696 return 0;
697 }
698
699 struct i8k_config_data {
700 int fan_mult;
701 int fan_max;
702 };
703
704 enum i8k_configs {
705 DELL_LATITUDE_D520,
706 DELL_LATITUDE_E6540,
707 DELL_PRECISION_490,
708 DELL_STUDIO,
709 DELL_XPS_M140,
710 };
711
712 static const struct i8k_config_data i8k_config_data[] = {
713 [DELL_LATITUDE_D520] = {
714 .fan_mult = 1,
715 .fan_max = I8K_FAN_TURBO,
716 },
717 [DELL_LATITUDE_E6540] = {
718 .fan_mult = 1,
719 .fan_max = I8K_FAN_HIGH,
720 },
721 [DELL_PRECISION_490] = {
722 .fan_mult = 1,
723 .fan_max = I8K_FAN_TURBO,
724 },
725 [DELL_STUDIO] = {
726 .fan_mult = 1,
727 .fan_max = I8K_FAN_HIGH,
728 },
729 [DELL_XPS_M140] = {
730 .fan_mult = 1,
731 .fan_max = I8K_FAN_HIGH,
732 },
733 };
734
735 static struct dmi_system_id i8k_dmi_table[] __initdata = {
736 {
737 .ident = "Dell Inspiron",
738 .matches = {
739 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
740 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
741 },
742 },
743 {
744 .ident = "Dell Latitude",
745 .matches = {
746 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
747 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
748 },
749 },
750 {
751 .ident = "Dell Inspiron 2",
752 .matches = {
753 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
754 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
755 },
756 },
757 {
758 .ident = "Dell Latitude D520",
759 .matches = {
760 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
761 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"),
762 },
763 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520],
764 },
765 {
766 .ident = "Dell Latitude E6440",
767 .matches = {
768 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
769 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6440"),
770 },
771 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_E6540],
772 },
773 {
774 .ident = "Dell Latitude E6540",
775 .matches = {
776 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
777 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6540"),
778 },
779 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_E6540],
780 },
781 {
782 .ident = "Dell Latitude 2",
783 .matches = {
784 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
785 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
786 },
787 },
788 { /* UK Inspiron 6400 */
789 .ident = "Dell Inspiron 3",
790 .matches = {
791 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
792 DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
793 },
794 },
795 {
796 .ident = "Dell Inspiron 3",
797 .matches = {
798 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
799 DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
800 },
801 },
802 {
803 .ident = "Dell Precision 490",
804 .matches = {
805 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
806 DMI_MATCH(DMI_PRODUCT_NAME,
807 "Precision WorkStation 490"),
808 },
809 .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490],
810 },
811 {
812 .ident = "Dell Precision",
813 .matches = {
814 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
815 DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
816 },
817 },
818 {
819 .ident = "Dell Vostro",
820 .matches = {
821 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
822 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
823 },
824 },
825 {
826 .ident = "Dell XPS421",
827 .matches = {
828 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
829 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
830 },
831 },
832 {
833 .ident = "Dell Studio",
834 .matches = {
835 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
836 DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
837 },
838 .driver_data = (void *)&i8k_config_data[DELL_STUDIO],
839 },
840 {
841 .ident = "Dell XPS M140",
842 .matches = {
843 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
844 DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
845 },
846 .driver_data = (void *)&i8k_config_data[DELL_XPS_M140],
847 },
848 { }
849 };
850
851 MODULE_DEVICE_TABLE(dmi, i8k_dmi_table);
852
853 /*
854 * Probe for the presence of a supported laptop.
855 */
856 static int __init i8k_probe(void)
857 {
858 const struct dmi_system_id *id;
859
860 /*
861 * Get DMI information
862 */
863 if (!dmi_check_system(i8k_dmi_table)) {
864 if (!ignore_dmi && !force)
865 return -ENODEV;
866
867 pr_info("not running on a supported Dell system.\n");
868 pr_info("vendor=%s, model=%s, version=%s\n",
869 i8k_get_dmi_data(DMI_SYS_VENDOR),
870 i8k_get_dmi_data(DMI_PRODUCT_NAME),
871 i8k_get_dmi_data(DMI_BIOS_VERSION));
872 }
873
874 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
875 sizeof(bios_version));
876
877 /*
878 * Get SMM Dell signature
879 */
880 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
881 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
882 pr_err("unable to get SMM Dell signature\n");
883 if (!force)
884 return -ENODEV;
885 }
886
887 i8k_fan_mult = fan_mult;
888 i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */
889 id = dmi_first_match(i8k_dmi_table);
890 if (id && id->driver_data) {
891 const struct i8k_config_data *conf = id->driver_data;
892
893 if (fan_mult == I8K_FAN_MULT && conf->fan_mult)
894 i8k_fan_mult = conf->fan_mult;
895 if (fan_max == I8K_FAN_HIGH && conf->fan_max)
896 i8k_fan_max = conf->fan_max;
897 }
898 i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);
899
900 return 0;
901 }
902
903 static int __init i8k_init(void)
904 {
905 struct proc_dir_entry *proc_i8k;
906 int err;
907
908 /* Are we running on an supported laptop? */
909 if (i8k_probe())
910 return -ENODEV;
911
912 /* Register the proc entry */
913 proc_i8k = proc_create("i8k", 0, NULL, &i8k_fops);
914 if (!proc_i8k)
915 return -ENOENT;
916
917 err = i8k_init_hwmon();
918 if (err)
919 goto exit_remove_proc;
920
921 return 0;
922
923 exit_remove_proc:
924 remove_proc_entry("i8k", NULL);
925 return err;
926 }
927
928 static void __exit i8k_exit(void)
929 {
930 hwmon_device_unregister(i8k_hwmon_dev);
931 remove_proc_entry("i8k", NULL);
932 }
933
934 module_init(i8k_init);
935 module_exit(i8k_exit);
Linux kernel - Deliverables
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