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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
67static DEFINE_MUTEX(i8k_mutex);
68static char bios_version[4];
69static struct device *i8k_hwmon_dev;
70static u32 i8k_hwmon_flags;
71static uint i8k_fan_mult = I8K_FAN_MULT;
72static uint i8k_pwm_mult;
73static 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
82MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
83MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
84MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver");
85MODULE_LICENSE("GPL");
86MODULE_ALIAS("i8k");
87
88static bool force;
89module_param(force, bool, 0);
90MODULE_PARM_DESC(force, "Force loading without checking for supported models");
91
92static bool ignore_dmi;
93module_param(ignore_dmi, bool, 0);
94MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
95
96#if IS_ENABLED(CONFIG_I8K)
97static bool restricted;
98module_param(restricted, bool, 0);
99MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
100
101static bool power_status;
102module_param(power_status, bool, 0600);
103MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
104#endif
105
106static uint fan_mult;
107module_param(fan_mult, uint, 0);
108MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)");
109
110static uint fan_max;
111module_param(fan_max, uint, 0);
112MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)");
113
114struct smm_regs {
115 unsigned int eax;
116 unsigned int ebx __packed;
117 unsigned int ecx __packed;
118 unsigned int edx __packed;
119 unsigned int esi __packed;
120 unsigned int edi __packed;
121};
122
123static inline const char *i8k_get_dmi_data(int field)
124{
125 const char *dmi_data = dmi_get_system_info(field);
126
127 return dmi_data && *dmi_data ? dmi_data : "?";
128}
129
130
131
132
133static int i8k_smm(struct smm_regs *regs)
134{
135 int rc;
136 int eax = regs->eax;
137 cpumask_var_t old_mask;
138
139
140 if (!alloc_cpumask_var(&old_mask, GFP_KERNEL))
141 return -ENOMEM;
142 cpumask_copy(old_mask, ¤t->cpus_allowed);
143 rc = set_cpus_allowed_ptr(current, cpumask_of(0));
144 if (rc)
145 goto out;
146 if (smp_processor_id() != 0) {
147 rc = -EBUSY;
148 goto out;
149 }
150
151#if defined(CONFIG_X86_64)
152 asm volatile("pushq %%rax\n\t"
153 "movl 0(%%rax),%%edx\n\t"
154 "pushq %%rdx\n\t"
155 "movl 4(%%rax),%%ebx\n\t"
156 "movl 8(%%rax),%%ecx\n\t"
157 "movl 12(%%rax),%%edx\n\t"
158 "movl 16(%%rax),%%esi\n\t"
159 "movl 20(%%rax),%%edi\n\t"
160 "popq %%rax\n\t"
161 "out %%al,$0xb2\n\t"
162 "out %%al,$0x84\n\t"
163 "xchgq %%rax,(%%rsp)\n\t"
164 "movl %%ebx,4(%%rax)\n\t"
165 "movl %%ecx,8(%%rax)\n\t"
166 "movl %%edx,12(%%rax)\n\t"
167 "movl %%esi,16(%%rax)\n\t"
168 "movl %%edi,20(%%rax)\n\t"
169 "popq %%rdx\n\t"
170 "movl %%edx,0(%%rax)\n\t"
171 "pushfq\n\t"
172 "popq %%rax\n\t"
173 "andl $1,%%eax\n"
174 : "=a"(rc)
175 : "a"(regs)
176 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
177#else
178 asm volatile("pushl %%eax\n\t"
179 "movl 0(%%eax),%%edx\n\t"
180 "push %%edx\n\t"
181 "movl 4(%%eax),%%ebx\n\t"
182 "movl 8(%%eax),%%ecx\n\t"
183 "movl 12(%%eax),%%edx\n\t"
184 "movl 16(%%eax),%%esi\n\t"
185 "movl 20(%%eax),%%edi\n\t"
186 "popl %%eax\n\t"
187 "out %%al,$0xb2\n\t"
188 "out %%al,$0x84\n\t"
189 "xchgl %%eax,(%%esp)\n\t"
190 "movl %%ebx,4(%%eax)\n\t"
191 "movl %%ecx,8(%%eax)\n\t"
192 "movl %%edx,12(%%eax)\n\t"
193 "movl %%esi,16(%%eax)\n\t"
194 "movl %%edi,20(%%eax)\n\t"
195 "popl %%edx\n\t"
196 "movl %%edx,0(%%eax)\n\t"
197 "lahf\n\t"
198 "shrl $8,%%eax\n\t"
199 "andl $1,%%eax\n"
200 : "=a"(rc)
201 : "a"(regs)
202 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
203#endif
204 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
205 rc = -EINVAL;
206
207out:
208 set_cpus_allowed_ptr(current, old_mask);
209 free_cpumask_var(old_mask);
210 return rc;
211}
212
213
214
215
216static int i8k_get_fan_status(int fan)
217{
218 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
219
220 regs.ebx = fan & 0xff;
221 return i8k_smm(®s) ? : regs.eax & 0xff;
222}
223
224
225
226
227static int i8k_get_fan_speed(int fan)
228{
229 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
230
231 regs.ebx = fan & 0xff;
232 return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult;
233}
234
235
236
237
238static int i8k_get_fan_type(int fan)
239{
240 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, };
241
242 regs.ebx = fan & 0xff;
243 return i8k_smm(®s) ? : regs.eax & 0xff;
244}
245
246
247
248
249static int i8k_get_fan_nominal_speed(int fan, int speed)
250{
251 struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, };
252
253 regs.ebx = (fan & 0xff) | (speed << 8);
254 return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult;
255}
256
257
258
259
260static int i8k_set_fan(int fan, int speed)
261{
262 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
263
264 speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed);
265 regs.ebx = (fan & 0xff) | (speed << 8);
266
267 return i8k_smm(®s) ? : i8k_get_fan_status(fan);
268}
269
270static int i8k_get_temp_type(int sensor)
271{
272 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, };
273
274 regs.ebx = sensor & 0xff;
275 return i8k_smm(®s) ? : regs.eax & 0xff;
276}
277
278
279
280
281static int _i8k_get_temp(int sensor)
282{
283 struct smm_regs regs = {
284 .eax = I8K_SMM_GET_TEMP,
285 .ebx = sensor & 0xff,
286 };
287
288 return i8k_smm(®s) ? : regs.eax & 0xff;
289}
290
291static int i8k_get_temp(int sensor)
292{
293 int temp = _i8k_get_temp(sensor);
294
295
296
297
298
299
300
301
302 if (temp == 0x99) {
303 msleep(100);
304 temp = _i8k_get_temp(sensor);
305 }
306
307
308
309
310
311
312
313
314 if (temp > I8K_MAX_TEMP)
315 return -ENODATA;
316
317 return temp;
318}
319
320static int i8k_get_dell_signature(int req_fn)
321{
322 struct smm_regs regs = { .eax = req_fn, };
323 int rc;
324
325 rc = i8k_smm(®s);
326 if (rc < 0)
327 return rc;
328
329 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
330}
331
332#if IS_ENABLED(CONFIG_I8K)
333
334
335
336
337static int i8k_get_fn_status(void)
338{
339 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
340 int rc;
341
342 rc = i8k_smm(®s);
343 if (rc < 0)
344 return rc;
345
346 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
347 case I8K_FN_UP:
348 return I8K_VOL_UP;
349 case I8K_FN_DOWN:
350 return I8K_VOL_DOWN;
351 case I8K_FN_MUTE:
352 return I8K_VOL_MUTE;
353 default:
354 return 0;
355 }
356}
357
358
359
360
361static int i8k_get_power_status(void)
362{
363 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
364 int rc;
365
366 rc = i8k_smm(®s);
367 if (rc < 0)
368 return rc;
369
370 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
371}
372
373
374
375
376
377static int
378i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
379{
380 int val = 0;
381 int speed;
382 unsigned char buff[16];
383 int __user *argp = (int __user *)arg;
384
385 if (!argp)
386 return -EINVAL;
387
388 switch (cmd) {
389 case I8K_BIOS_VERSION:
390 val = (bios_version[0] << 16) |
391 (bios_version[1] << 8) | bios_version[2];
392 break;
393
394 case I8K_MACHINE_ID:
395 memset(buff, 0, 16);
396 strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
397 sizeof(buff));
398 break;
399
400 case I8K_FN_STATUS:
401 val = i8k_get_fn_status();
402 break;
403
404 case I8K_POWER_STATUS:
405 val = i8k_get_power_status();
406 break;
407
408 case I8K_GET_TEMP:
409 val = i8k_get_temp(0);
410 break;
411
412 case I8K_GET_SPEED:
413 if (copy_from_user(&val, argp, sizeof(int)))
414 return -EFAULT;
415
416 val = i8k_get_fan_speed(val);
417 break;
418
419 case I8K_GET_FAN:
420 if (copy_from_user(&val, argp, sizeof(int)))
421 return -EFAULT;
422
423 val = i8k_get_fan_status(val);
424 break;
425
426 case I8K_SET_FAN:
427 if (restricted && !capable(CAP_SYS_ADMIN))
428 return -EPERM;
429
430 if (copy_from_user(&val, argp, sizeof(int)))
431 return -EFAULT;
432
433 if (copy_from_user(&speed, argp + 1, sizeof(int)))
434 return -EFAULT;
435
436 val = i8k_set_fan(val, speed);
437 break;
438
439 default:
440 return -EINVAL;
441 }
442
443 if (val < 0)
444 return val;
445
446 switch (cmd) {
447 case I8K_BIOS_VERSION:
448 if (copy_to_user(argp, &val, 4))
449 return -EFAULT;
450
451 break;
452 case I8K_MACHINE_ID:
453 if (copy_to_user(argp, buff, 16))
454 return -EFAULT;
455
456 break;
457 default:
458 if (copy_to_user(argp, &val, sizeof(int)))
459 return -EFAULT;
460
461 break;
462 }
463
464 return 0;
465}
466
467static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
468{
469 long ret;
470
471 mutex_lock(&i8k_mutex);
472 ret = i8k_ioctl_unlocked(fp, cmd, arg);
473 mutex_unlock(&i8k_mutex);
474
475 return ret;
476}
477
478
479
480
481static int i8k_proc_show(struct seq_file *seq, void *offset)
482{
483 int fn_key, cpu_temp, ac_power;
484 int left_fan, right_fan, left_speed, right_speed;
485
486 cpu_temp = i8k_get_temp(0);
487 left_fan = i8k_get_fan_status(I8K_FAN_LEFT);
488 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT);
489 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT);
490 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT);
491 fn_key = i8k_get_fn_status();
492 if (power_status)
493 ac_power = i8k_get_power_status();
494 else
495 ac_power = -1;
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511 seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
512 I8K_PROC_FMT,
513 bios_version,
514 i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
515 cpu_temp,
516 left_fan, right_fan, left_speed, right_speed,
517 ac_power, fn_key);
518
519 return 0;
520}
521
522static int i8k_open_fs(struct inode *inode, struct file *file)
523{
524 return single_open(file, i8k_proc_show, NULL);
525}
526
527static const struct file_operations i8k_fops = {
528 .owner = THIS_MODULE,
529 .open = i8k_open_fs,
530 .read = seq_read,
531 .llseek = seq_lseek,
532 .release = single_release,
533 .unlocked_ioctl = i8k_ioctl,
534};
535
536static void __init i8k_init_procfs(void)
537{
538
539 proc_create("i8k", 0, NULL, &i8k_fops);
540}
541
542static void __exit i8k_exit_procfs(void)
543{
544 remove_proc_entry("i8k", NULL);
545}
546
547#else
548
549static inline void __init i8k_init_procfs(void)
550{
551}
552
553static inline void __exit i8k_exit_procfs(void)
554{
555}
556
557#endif
558
559
560
561
562
563static ssize_t i8k_hwmon_show_temp_label(struct device *dev,
564 struct device_attribute *devattr,
565 char *buf)
566{
567 static const char * const labels[] = {
568 "CPU",
569 "GPU",
570 "SODIMM",
571 "Other",
572 "Ambient",
573 "Other",
574 };
575 int index = to_sensor_dev_attr(devattr)->index;
576 int type;
577
578 type = i8k_get_temp_type(index);
579 if (type < 0)
580 return type;
581 if (type >= ARRAY_SIZE(labels))
582 type = ARRAY_SIZE(labels) - 1;
583 return sprintf(buf, "%s\n", labels[type]);
584}
585
586static ssize_t i8k_hwmon_show_temp(struct device *dev,
587 struct device_attribute *devattr,
588 char *buf)
589{
590 int index = to_sensor_dev_attr(devattr)->index;
591 int temp;
592
593 temp = i8k_get_temp(index);
594 if (temp < 0)
595 return temp;
596 return sprintf(buf, "%d\n", temp * 1000);
597}
598
599static ssize_t i8k_hwmon_show_fan_label(struct device *dev,
600 struct device_attribute *devattr,
601 char *buf)
602{
603 static const char * const labels[] = {
604 "Processor Fan",
605 "Motherboard Fan",
606 "Video Fan",
607 "Power Supply Fan",
608 "Chipset Fan",
609 "Other Fan",
610 };
611 int index = to_sensor_dev_attr(devattr)->index;
612 bool dock = false;
613 int type;
614
615 type = i8k_get_fan_type(index);
616 if (type < 0)
617 return type;
618
619 if (type & 0x10) {
620 dock = true;
621 type &= 0x0F;
622 }
623
624 if (type >= ARRAY_SIZE(labels))
625 type = (ARRAY_SIZE(labels) - 1);
626
627 return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]);
628}
629
630static ssize_t i8k_hwmon_show_fan(struct device *dev,
631 struct device_attribute *devattr,
632 char *buf)
633{
634 int index = to_sensor_dev_attr(devattr)->index;
635 int fan_speed;
636
637 fan_speed = i8k_get_fan_speed(index);
638 if (fan_speed < 0)
639 return fan_speed;
640 return sprintf(buf, "%d\n", fan_speed);
641}
642
643static ssize_t i8k_hwmon_show_pwm(struct device *dev,
644 struct device_attribute *devattr,
645 char *buf)
646{
647 int index = to_sensor_dev_attr(devattr)->index;
648 int status;
649
650 status = i8k_get_fan_status(index);
651 if (status < 0)
652 return -EIO;
653 return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255));
654}
655
656static ssize_t i8k_hwmon_set_pwm(struct device *dev,
657 struct device_attribute *attr,
658 const char *buf, size_t count)
659{
660 int index = to_sensor_dev_attr(attr)->index;
661 unsigned long val;
662 int err;
663
664 err = kstrtoul(buf, 10, &val);
665 if (err)
666 return err;
667 val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max);
668
669 mutex_lock(&i8k_mutex);
670 err = i8k_set_fan(index, val);
671 mutex_unlock(&i8k_mutex);
672
673 return err < 0 ? -EIO : count;
674}
675
676static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0);
677static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
678 0);
679static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1);
680static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
681 1);
682static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2);
683static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
684 2);
685static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3);
686static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
687 3);
688static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 0);
689static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
690 0);
691static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
692 i8k_hwmon_set_pwm, 0);
693static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
694 1);
695static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
696 1);
697static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
698 i8k_hwmon_set_pwm, 1);
699
700static struct attribute *i8k_attrs[] = {
701 &sensor_dev_attr_temp1_input.dev_attr.attr,
702 &sensor_dev_attr_temp1_label.dev_attr.attr,
703 &sensor_dev_attr_temp2_input.dev_attr.attr,
704 &sensor_dev_attr_temp2_label.dev_attr.attr,
705 &sensor_dev_attr_temp3_input.dev_attr.attr,
706 &sensor_dev_attr_temp3_label.dev_attr.attr,
707 &sensor_dev_attr_temp4_input.dev_attr.attr,
708 &sensor_dev_attr_temp4_label.dev_attr.attr,
709 &sensor_dev_attr_fan1_input.dev_attr.attr,
710 &sensor_dev_attr_fan1_label.dev_attr.attr,
711 &sensor_dev_attr_pwm1.dev_attr.attr,
712 &sensor_dev_attr_fan2_input.dev_attr.attr,
713 &sensor_dev_attr_fan2_label.dev_attr.attr,
714 &sensor_dev_attr_pwm2.dev_attr.attr,
715 NULL
716};
717
718static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
719 int index)
720{
721 if (index >= 0 && index <= 1 &&
722 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
723 return 0;
724 if (index >= 2 && index <= 3 &&
725 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
726 return 0;
727 if (index >= 4 && index <= 5 &&
728 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
729 return 0;
730 if (index >= 6 && index <= 7 &&
731 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
732 return 0;
733 if (index >= 8 && index <= 10 &&
734 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
735 return 0;
736 if (index >= 11 && index <= 13 &&
737 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
738 return 0;
739
740 return attr->mode;
741}
742
743static const struct attribute_group i8k_group = {
744 .attrs = i8k_attrs,
745 .is_visible = i8k_is_visible,
746};
747__ATTRIBUTE_GROUPS(i8k);
748
749static int __init i8k_init_hwmon(void)
750{
751 int err;
752
753 i8k_hwmon_flags = 0;
754
755
756 err = i8k_get_temp_type(0);
757 if (err >= 0)
758 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1;
759
760 err = i8k_get_temp_type(1);
761 if (err >= 0)
762 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2;
763 err = i8k_get_temp_type(2);
764 if (err >= 0)
765 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3;
766 err = i8k_get_temp_type(3);
767 if (err >= 0)
768 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
769
770
771 err = i8k_get_fan_type(0);
772 if (err >= 0)
773 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
774
775
776 err = i8k_get_fan_type(1);
777 if (err >= 0)
778 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
779
780 i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm",
781 NULL, i8k_groups);
782 if (IS_ERR(i8k_hwmon_dev)) {
783 err = PTR_ERR(i8k_hwmon_dev);
784 i8k_hwmon_dev = NULL;
785 pr_err("hwmon registration failed (%d)\n", err);
786 return err;
787 }
788 return 0;
789}
790
791struct i8k_config_data {
792 uint fan_mult;
793 uint fan_max;
794};
795
796enum i8k_configs {
797 DELL_LATITUDE_D520,
798 DELL_PRECISION_490,
799 DELL_STUDIO,
800 DELL_XPS,
801};
802
803static const struct i8k_config_data i8k_config_data[] = {
804 [DELL_LATITUDE_D520] = {
805 .fan_mult = 1,
806 .fan_max = I8K_FAN_TURBO,
807 },
808 [DELL_PRECISION_490] = {
809 .fan_mult = 1,
810 .fan_max = I8K_FAN_TURBO,
811 },
812 [DELL_STUDIO] = {
813 .fan_mult = 1,
814 .fan_max = I8K_FAN_HIGH,
815 },
816 [DELL_XPS] = {
817 .fan_mult = 1,
818 .fan_max = I8K_FAN_HIGH,
819 },
820};
821
822static struct dmi_system_id i8k_dmi_table[] __initdata = {
823 {
824 .ident = "Dell Inspiron",
825 .matches = {
826 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
827 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
828 },
829 },
830 {
831 .ident = "Dell Latitude",
832 .matches = {
833 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
834 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
835 },
836 },
837 {
838 .ident = "Dell Inspiron 2",
839 .matches = {
840 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
841 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
842 },
843 },
844 {
845 .ident = "Dell Latitude D520",
846 .matches = {
847 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
848 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"),
849 },
850 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520],
851 },
852 {
853 .ident = "Dell Latitude 2",
854 .matches = {
855 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
856 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
857 },
858 },
859 {
860 .ident = "Dell Inspiron 3",
861 .matches = {
862 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
863 DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
864 },
865 },
866 {
867 .ident = "Dell Inspiron 3",
868 .matches = {
869 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
870 DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
871 },
872 },
873 {
874 .ident = "Dell Precision 490",
875 .matches = {
876 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
877 DMI_MATCH(DMI_PRODUCT_NAME,
878 "Precision WorkStation 490"),
879 },
880 .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490],
881 },
882 {
883 .ident = "Dell Precision",
884 .matches = {
885 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
886 DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
887 },
888 },
889 {
890 .ident = "Dell Vostro",
891 .matches = {
892 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
893 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
894 },
895 },
896 {
897 .ident = "Dell XPS421",
898 .matches = {
899 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
900 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
901 },
902 },
903 {
904 .ident = "Dell Studio",
905 .matches = {
906 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
907 DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
908 },
909 .driver_data = (void *)&i8k_config_data[DELL_STUDIO],
910 },
911 {
912 .ident = "Dell XPS 13",
913 .matches = {
914 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
915 DMI_MATCH(DMI_PRODUCT_NAME, "XPS13"),
916 },
917 .driver_data = (void *)&i8k_config_data[DELL_XPS],
918 },
919 {
920 .ident = "Dell XPS M140",
921 .matches = {
922 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
923 DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
924 },
925 .driver_data = (void *)&i8k_config_data[DELL_XPS],
926 },
927 { }
928};
929
930MODULE_DEVICE_TABLE(dmi, i8k_dmi_table);
931
932static struct dmi_system_id i8k_blacklist_dmi_table[] __initdata = {
933 {
934
935
936
937
938 .ident = "Dell Studio XPS 8100",
939 .matches = {
940 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
941 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"),
942 },
943 },
944 { }
945};
946
947
948
949
950static int __init i8k_probe(void)
951{
952 const struct dmi_system_id *id;
953 int fan, ret;
954
955
956
957
958 if (!dmi_check_system(i8k_dmi_table) ||
959 dmi_check_system(i8k_blacklist_dmi_table)) {
960 if (!ignore_dmi && !force)
961 return -ENODEV;
962
963 pr_info("not running on a supported Dell system.\n");
964 pr_info("vendor=%s, model=%s, version=%s\n",
965 i8k_get_dmi_data(DMI_SYS_VENDOR),
966 i8k_get_dmi_data(DMI_PRODUCT_NAME),
967 i8k_get_dmi_data(DMI_BIOS_VERSION));
968 }
969
970 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
971 sizeof(bios_version));
972
973
974
975
976 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
977 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
978 pr_err("unable to get SMM Dell signature\n");
979 if (!force)
980 return -ENODEV;
981 }
982
983
984
985
986
987 id = dmi_first_match(i8k_dmi_table);
988 if (id && id->driver_data) {
989 const struct i8k_config_data *conf = id->driver_data;
990 if (!fan_mult && conf->fan_mult)
991 fan_mult = conf->fan_mult;
992 if (!fan_max && conf->fan_max)
993 fan_max = conf->fan_max;
994 }
995
996 i8k_fan_max = fan_max ? : I8K_FAN_HIGH;
997 i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);
998
999 if (!fan_mult) {
1000
1001
1002
1003
1004 for (fan = 0; fan < 2; ++fan) {
1005 ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max);
1006 if (ret < 0)
1007 continue;
1008 if (ret > I8K_FAN_MAX_RPM)
1009 i8k_fan_mult = 1;
1010 break;
1011 }
1012 } else {
1013
1014 i8k_fan_mult = fan_mult;
1015 }
1016
1017 return 0;
1018}
1019
1020static int __init i8k_init(void)
1021{
1022 int err;
1023
1024
1025 if (i8k_probe())
1026 return -ENODEV;
1027
1028 err = i8k_init_hwmon();
1029 if (err)
1030 return err;
1031
1032 i8k_init_procfs();
1033 return 0;
1034}
1035
1036static void __exit i8k_exit(void)
1037{
1038 hwmon_device_unregister(i8k_hwmon_dev);
1039 i8k_exit_procfs();
1040}
1041
1042module_init(i8k_init);
1043module_exit(i8k_exit);
1044
