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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_DELL_SIG1 0xfea3
46#define I8K_SMM_GET_DELL_SIG2 0xffa3
47
48#define I8K_FAN_MULT 30
49#define I8K_MAX_TEMP 127
50
51#define I8K_FN_NONE 0x00
52#define I8K_FN_UP 0x01
53#define I8K_FN_DOWN 0x02
54#define I8K_FN_MUTE 0x04
55#define I8K_FN_MASK 0x07
56#define I8K_FN_SHIFT 8
57
58#define I8K_POWER_AC 0x05
59#define I8K_POWER_BATTERY 0x01
60
61#define I8K_TEMPERATURE_BUG 1
62
63static DEFINE_MUTEX(i8k_mutex);
64static char bios_version[4];
65static struct device *i8k_hwmon_dev;
66static u32 i8k_hwmon_flags;
67static int i8k_fan_mult;
68static int i8k_pwm_mult;
69static int i8k_fan_max = I8K_FAN_HIGH;
70
71#define I8K_HWMON_HAVE_TEMP1 (1 << 0)
72#define I8K_HWMON_HAVE_TEMP2 (1 << 1)
73#define I8K_HWMON_HAVE_TEMP3 (1 << 2)
74#define I8K_HWMON_HAVE_TEMP4 (1 << 3)
75#define I8K_HWMON_HAVE_FAN1 (1 << 4)
76#define I8K_HWMON_HAVE_FAN2 (1 << 5)
77
78MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
79MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
80MODULE_LICENSE("GPL");
81
82static bool force;
83module_param(force, bool, 0);
84MODULE_PARM_DESC(force, "Force loading without checking for supported models");
85
86static bool ignore_dmi;
87module_param(ignore_dmi, bool, 0);
88MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
89
90static bool restricted;
91module_param(restricted, bool, 0);
92MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
93
94static bool power_status;
95module_param(power_status, bool, 0600);
96MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
97
98static int fan_mult = I8K_FAN_MULT;
99module_param(fan_mult, int, 0);
100MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with");
101
102static int fan_max = I8K_FAN_HIGH;
103module_param(fan_max, int, 0);
104MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed");
105
106static int i8k_open_fs(struct inode *inode, struct file *file);
107static long i8k_ioctl(struct file *, unsigned int, unsigned long);
108
109static const struct file_operations i8k_fops = {
110 .owner = THIS_MODULE,
111 .open = i8k_open_fs,
112 .read = seq_read,
113 .llseek = seq_lseek,
114 .release = single_release,
115 .unlocked_ioctl = i8k_ioctl,
116};
117
118struct smm_regs {
119 unsigned int eax;
120 unsigned int ebx __packed;
121 unsigned int ecx __packed;
122 unsigned int edx __packed;
123 unsigned int esi __packed;
124 unsigned int edi __packed;
125};
126
127static inline const char *i8k_get_dmi_data(int field)
128{
129 const char *dmi_data = dmi_get_system_info(field);
130
131 return dmi_data && *dmi_data ? dmi_data : "?";
132}
133
134
135
136
137static int i8k_smm(struct smm_regs *regs)
138{
139 int rc;
140 int eax = regs->eax;
141 cpumask_var_t old_mask;
142
143
144 if (!alloc_cpumask_var(&old_mask, GFP_KERNEL))
145 return -ENOMEM;
146 cpumask_copy(old_mask, ¤t->cpus_allowed);
147 rc = set_cpus_allowed_ptr(current, cpumask_of(0));
148 if (rc)
149 goto out;
150 if (smp_processor_id() != 0) {
151 rc = -EBUSY;
152 goto out;
153 }
154
155#if defined(CONFIG_X86_64)
156 asm volatile("pushq %%rax\n\t"
157 "movl 0(%%rax),%%edx\n\t"
158 "pushq %%rdx\n\t"
159 "movl 4(%%rax),%%ebx\n\t"
160 "movl 8(%%rax),%%ecx\n\t"
161 "movl 12(%%rax),%%edx\n\t"
162 "movl 16(%%rax),%%esi\n\t"
163 "movl 20(%%rax),%%edi\n\t"
164 "popq %%rax\n\t"
165 "out %%al,$0xb2\n\t"
166 "out %%al,$0x84\n\t"
167 "xchgq %%rax,(%%rsp)\n\t"
168 "movl %%ebx,4(%%rax)\n\t"
169 "movl %%ecx,8(%%rax)\n\t"
170 "movl %%edx,12(%%rax)\n\t"
171 "movl %%esi,16(%%rax)\n\t"
172 "movl %%edi,20(%%rax)\n\t"
173 "popq %%rdx\n\t"
174 "movl %%edx,0(%%rax)\n\t"
175 "pushfq\n\t"
176 "popq %%rax\n\t"
177 "andl $1,%%eax\n"
178 : "=a"(rc)
179 : "a"(regs)
180 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
181#else
182 asm volatile("pushl %%eax\n\t"
183 "movl 0(%%eax),%%edx\n\t"
184 "push %%edx\n\t"
185 "movl 4(%%eax),%%ebx\n\t"
186 "movl 8(%%eax),%%ecx\n\t"
187 "movl 12(%%eax),%%edx\n\t"
188 "movl 16(%%eax),%%esi\n\t"
189 "movl 20(%%eax),%%edi\n\t"
190 "popl %%eax\n\t"
191 "out %%al,$0xb2\n\t"
192 "out %%al,$0x84\n\t"
193 "xchgl %%eax,(%%esp)\n\t"
194 "movl %%ebx,4(%%eax)\n\t"
195 "movl %%ecx,8(%%eax)\n\t"
196 "movl %%edx,12(%%eax)\n\t"
197 "movl %%esi,16(%%eax)\n\t"
198 "movl %%edi,20(%%eax)\n\t"
199 "popl %%edx\n\t"
200 "movl %%edx,0(%%eax)\n\t"
201 "lahf\n\t"
202 "shrl $8,%%eax\n\t"
203 "andl $1,%%eax\n"
204 : "=a"(rc)
205 : "a"(regs)
206 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
207#endif
208 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
209 rc = -EINVAL;
210
211out:
212 set_cpus_allowed_ptr(current, old_mask);
213 free_cpumask_var(old_mask);
214 return rc;
215}
216
217
218
219
220static int i8k_get_fn_status(void)
221{
222 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
223 int rc;
224
225 rc = i8k_smm(®s);
226 if (rc < 0)
227 return rc;
228
229 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
230 case I8K_FN_UP:
231 return I8K_VOL_UP;
232 case I8K_FN_DOWN:
233 return I8K_VOL_DOWN;
234 case I8K_FN_MUTE:
235 return I8K_VOL_MUTE;
236 default:
237 return 0;
238 }
239}
240
241
242
243
244static int i8k_get_power_status(void)
245{
246 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
247 int rc;
248
249 rc = i8k_smm(®s);
250 if (rc < 0)
251 return rc;
252
253 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
254}
255
256
257
258
259static int i8k_get_fan_status(int fan)
260{
261 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
262
263 regs.ebx = fan & 0xff;
264 return i8k_smm(®s) ? : regs.eax & 0xff;
265}
266
267
268
269
270static int i8k_get_fan_speed(int fan)
271{
272 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
273
274 regs.ebx = fan & 0xff;
275 return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult;
276}
277
278
279
280
281static int i8k_set_fan(int fan, int speed)
282{
283 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
284
285 speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed);
286 regs.ebx = (fan & 0xff) | (speed << 8);
287
288 return i8k_smm(®s) ? : i8k_get_fan_status(fan);
289}
290
291
292
293
294static int i8k_get_temp(int sensor)
295{
296 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, };
297 int rc;
298 int temp;
299
300#ifdef I8K_TEMPERATURE_BUG
301 static int prev[4];
302#endif
303 regs.ebx = sensor & 0xff;
304 rc = i8k_smm(®s);
305 if (rc < 0)
306 return rc;
307
308 temp = regs.eax & 0xff;
309
310#ifdef I8K_TEMPERATURE_BUG
311
312
313
314
315
316
317
318 if (temp > I8K_MAX_TEMP) {
319 temp = prev[sensor];
320 prev[sensor] = I8K_MAX_TEMP;
321 } else {
322 prev[sensor] = temp;
323 }
324#endif
325
326 return temp;
327}
328
329static int i8k_get_dell_signature(int req_fn)
330{
331 struct smm_regs regs = { .eax = req_fn, };
332 int rc;
333
334 rc = i8k_smm(®s);
335 if (rc < 0)
336 return rc;
337
338 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
339}
340
341static int
342i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
343{
344 int val = 0;
345 int speed;
346 unsigned char buff[16];
347 int __user *argp = (int __user *)arg;
348
349 if (!argp)
350 return -EINVAL;
351
352 switch (cmd) {
353 case I8K_BIOS_VERSION:
354 val = (bios_version[0] << 16) |
355 (bios_version[1] << 8) | bios_version[2];
356 break;
357
358 case I8K_MACHINE_ID:
359 memset(buff, 0, 16);
360 strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
361 sizeof(buff));
362 break;
363
364 case I8K_FN_STATUS:
365 val = i8k_get_fn_status();
366 break;
367
368 case I8K_POWER_STATUS:
369 val = i8k_get_power_status();
370 break;
371
372 case I8K_GET_TEMP:
373 val = i8k_get_temp(0);
374 break;
375
376 case I8K_GET_SPEED:
377 if (copy_from_user(&val, argp, sizeof(int)))
378 return -EFAULT;
379
380 val = i8k_get_fan_speed(val);
381 break;
382
383 case I8K_GET_FAN:
384 if (copy_from_user(&val, argp, sizeof(int)))
385 return -EFAULT;
386
387 val = i8k_get_fan_status(val);
388 break;
389
390 case I8K_SET_FAN:
391 if (restricted && !capable(CAP_SYS_ADMIN))
392 return -EPERM;
393
394 if (copy_from_user(&val, argp, sizeof(int)))
395 return -EFAULT;
396
397 if (copy_from_user(&speed, argp + 1, sizeof(int)))
398 return -EFAULT;
399
400 val = i8k_set_fan(val, speed);
401 break;
402
403 default:
404 return -EINVAL;
405 }
406
407 if (val < 0)
408 return val;
409
410 switch (cmd) {
411 case I8K_BIOS_VERSION:
412 if (copy_to_user(argp, &val, 4))
413 return -EFAULT;
414
415 break;
416 case I8K_MACHINE_ID:
417 if (copy_to_user(argp, buff, 16))
418 return -EFAULT;
419
420 break;
421 default:
422 if (copy_to_user(argp, &val, sizeof(int)))
423 return -EFAULT;
424
425 break;
426 }
427
428 return 0;
429}
430
431static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
432{
433 long ret;
434
435 mutex_lock(&i8k_mutex);
436 ret = i8k_ioctl_unlocked(fp, cmd, arg);
437 mutex_unlock(&i8k_mutex);
438
439 return ret;
440}
441
442
443
444
445static int i8k_proc_show(struct seq_file *seq, void *offset)
446{
447 int fn_key, cpu_temp, ac_power;
448 int left_fan, right_fan, left_speed, right_speed;
449
450 cpu_temp = i8k_get_temp(0);
451 left_fan = i8k_get_fan_status(I8K_FAN_LEFT);
452 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT);
453 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT);
454 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT);
455 fn_key = i8k_get_fn_status();
456 if (power_status)
457 ac_power = i8k_get_power_status();
458 else
459 ac_power = -1;
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475 return seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
476 I8K_PROC_FMT,
477 bios_version,
478 i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
479 cpu_temp,
480 left_fan, right_fan, left_speed, right_speed,
481 ac_power, fn_key);
482}
483
484static int i8k_open_fs(struct inode *inode, struct file *file)
485{
486 return single_open(file, i8k_proc_show, NULL);
487}
488
489
490
491
492
493
494static ssize_t i8k_hwmon_show_temp(struct device *dev,
495 struct device_attribute *devattr,
496 char *buf)
497{
498 int index = to_sensor_dev_attr(devattr)->index;
499 int temp;
500
501 temp = i8k_get_temp(index);
502 if (temp < 0)
503 return temp;
504 return sprintf(buf, "%d\n", temp * 1000);
505}
506
507static ssize_t i8k_hwmon_show_fan(struct device *dev,
508 struct device_attribute *devattr,
509 char *buf)
510{
511 int index = to_sensor_dev_attr(devattr)->index;
512 int fan_speed;
513
514 fan_speed = i8k_get_fan_speed(index);
515 if (fan_speed < 0)
516 return fan_speed;
517 return sprintf(buf, "%d\n", fan_speed);
518}
519
520static ssize_t i8k_hwmon_show_pwm(struct device *dev,
521 struct device_attribute *devattr,
522 char *buf)
523{
524 int index = to_sensor_dev_attr(devattr)->index;
525 int status;
526
527 status = i8k_get_fan_status(index);
528 if (status < 0)
529 return -EIO;
530 return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255));
531}
532
533static ssize_t i8k_hwmon_set_pwm(struct device *dev,
534 struct device_attribute *attr,
535 const char *buf, size_t count)
536{
537 int index = to_sensor_dev_attr(attr)->index;
538 unsigned long val;
539 int err;
540
541 err = kstrtoul(buf, 10, &val);
542 if (err)
543 return err;
544 val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max);
545
546 mutex_lock(&i8k_mutex);
547 err = i8k_set_fan(index, val);
548 mutex_unlock(&i8k_mutex);
549
550 return err < 0 ? -EIO : count;
551}
552
553static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0);
554static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1);
555static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2);
556static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3);
557static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
558 I8K_FAN_LEFT);
559static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
560 i8k_hwmon_set_pwm, I8K_FAN_LEFT);
561static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
562 I8K_FAN_RIGHT);
563static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
564 i8k_hwmon_set_pwm, I8K_FAN_RIGHT);
565
566static struct attribute *i8k_attrs[] = {
567 &sensor_dev_attr_temp1_input.dev_attr.attr,
568 &sensor_dev_attr_temp2_input.dev_attr.attr,
569 &sensor_dev_attr_temp3_input.dev_attr.attr,
570 &sensor_dev_attr_temp4_input.dev_attr.attr,
571 &sensor_dev_attr_fan1_input.dev_attr.attr,
572 &sensor_dev_attr_pwm1.dev_attr.attr,
573 &sensor_dev_attr_fan2_input.dev_attr.attr,
574 &sensor_dev_attr_pwm2.dev_attr.attr,
575 NULL
576};
577
578static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
579 int index)
580{
581 if (index == 0 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
582 return 0;
583 if (index == 1 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
584 return 0;
585 if (index == 2 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
586 return 0;
587 if (index == 3 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
588 return 0;
589 if (index >= 4 && index <= 5 &&
590 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
591 return 0;
592 if (index >= 6 && index <= 7 &&
593 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
594 return 0;
595
596 return attr->mode;
597}
598
599static const struct attribute_group i8k_group = {
600 .attrs = i8k_attrs,
601 .is_visible = i8k_is_visible,
602};
603__ATTRIBUTE_GROUPS(i8k);
604
605static int __init i8k_init_hwmon(void)
606{
607 int err;
608
609 i8k_hwmon_flags = 0;
610
611
612 err = i8k_get_temp(0);
613 if (err >= 0)
614 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1;
615
616 err = i8k_get_temp(1);
617 if (err >= 0)
618 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2;
619 err = i8k_get_temp(2);
620 if (err >= 0)
621 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3;
622 err = i8k_get_temp(3);
623 if (err >= 0)
624 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
625
626
627 err = i8k_get_fan_status(I8K_FAN_LEFT);
628 if (err >= 0)
629 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
630
631
632 err = i8k_get_fan_status(I8K_FAN_RIGHT);
633 if (err >= 0)
634 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
635
636 i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "i8k", NULL,
637 i8k_groups);
638 if (IS_ERR(i8k_hwmon_dev)) {
639 err = PTR_ERR(i8k_hwmon_dev);
640 i8k_hwmon_dev = NULL;
641 pr_err("hwmon registration failed (%d)\n", err);
642 return err;
643 }
644 return 0;
645}
646
647struct i8k_config_data {
648 int fan_mult;
649 int fan_max;
650};
651
652enum i8k_configs {
653 DELL_LATITUDE_D520,
654 DELL_LATITUDE_E6540,
655 DELL_PRECISION_490,
656 DELL_STUDIO,
657 DELL_XPS_M140,
658};
659
660static const struct i8k_config_data i8k_config_data[] = {
661 [DELL_LATITUDE_D520] = {
662 .fan_mult = 1,
663 .fan_max = I8K_FAN_TURBO,
664 },
665 [DELL_LATITUDE_E6540] = {
666 .fan_mult = 1,
667 .fan_max = I8K_FAN_HIGH,
668 },
669 [DELL_PRECISION_490] = {
670 .fan_mult = 1,
671 .fan_max = I8K_FAN_TURBO,
672 },
673 [DELL_STUDIO] = {
674 .fan_mult = 1,
675 .fan_max = I8K_FAN_HIGH,
676 },
677 [DELL_XPS_M140] = {
678 .fan_mult = 1,
679 .fan_max = I8K_FAN_HIGH,
680 },
681};
682
683static struct dmi_system_id i8k_dmi_table[] __initdata = {
684 {
685 .ident = "Dell Inspiron",
686 .matches = {
687 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
688 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
689 },
690 },
691 {
692 .ident = "Dell Latitude",
693 .matches = {
694 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
695 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
696 },
697 },
698 {
699 .ident = "Dell Inspiron 2",
700 .matches = {
701 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
702 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
703 },
704 },
705 {
706 .ident = "Dell Latitude D520",
707 .matches = {
708 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
709 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"),
710 },
711 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520],
712 },
713 {
714 .ident = "Dell Latitude E6540",
715 .matches = {
716 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
717 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6540"),
718 },
719 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_E6540],
720 },
721 {
722 .ident = "Dell Latitude 2",
723 .matches = {
724 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
725 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
726 },
727 },
728 {
729 .ident = "Dell Inspiron 3",
730 .matches = {
731 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
732 DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
733 },
734 },
735 {
736 .ident = "Dell Inspiron 3",
737 .matches = {
738 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
739 DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
740 },
741 },
742 {
743 .ident = "Dell Precision 490",
744 .matches = {
745 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
746 DMI_MATCH(DMI_PRODUCT_NAME,
747 "Precision WorkStation 490"),
748 },
749 .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490],
750 },
751 {
752 .ident = "Dell Precision",
753 .matches = {
754 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
755 DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
756 },
757 },
758 {
759 .ident = "Dell Vostro",
760 .matches = {
761 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
762 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
763 },
764 },
765 {
766 .ident = "Dell XPS421",
767 .matches = {
768 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
769 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
770 },
771 },
772 {
773 .ident = "Dell Studio",
774 .matches = {
775 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
776 DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
777 },
778 .driver_data = (void *)&i8k_config_data[DELL_STUDIO],
779 },
780 {
781 .ident = "Dell XPS M140",
782 .matches = {
783 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
784 DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
785 },
786 .driver_data = (void *)&i8k_config_data[DELL_XPS_M140],
787 },
788 { }
789};
790
791
792
793
794static int __init i8k_probe(void)
795{
796 const struct dmi_system_id *id;
797
798
799
800
801 if (!dmi_check_system(i8k_dmi_table)) {
802 if (!ignore_dmi && !force)
803 return -ENODEV;
804
805 pr_info("not running on a supported Dell system.\n");
806 pr_info("vendor=%s, model=%s, version=%s\n",
807 i8k_get_dmi_data(DMI_SYS_VENDOR),
808 i8k_get_dmi_data(DMI_PRODUCT_NAME),
809 i8k_get_dmi_data(DMI_BIOS_VERSION));
810 }
811
812 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
813 sizeof(bios_version));
814
815
816
817
818 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
819 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
820 pr_err("unable to get SMM Dell signature\n");
821 if (!force)
822 return -ENODEV;
823 }
824
825 i8k_fan_mult = fan_mult;
826 i8k_fan_max = fan_max ? : I8K_FAN_HIGH;
827 id = dmi_first_match(i8k_dmi_table);
828 if (id && id->driver_data) {
829 const struct i8k_config_data *conf = id->driver_data;
830
831 if (fan_mult == I8K_FAN_MULT && conf->fan_mult)
832 i8k_fan_mult = conf->fan_mult;
833 if (fan_max == I8K_FAN_HIGH && conf->fan_max)
834 i8k_fan_max = conf->fan_max;
835 }
836 i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);
837
838 return 0;
839}
840
841static int __init i8k_init(void)
842{
843 struct proc_dir_entry *proc_i8k;
844 int err;
845
846
847 if (i8k_probe())
848 return -ENODEV;
849
850
851 proc_i8k = proc_create("i8k", 0, NULL, &i8k_fops);
852 if (!proc_i8k)
853 return -ENOENT;
854
855 err = i8k_init_hwmon();
856 if (err)
857 goto exit_remove_proc;
858
859 return 0;
860
861 exit_remove_proc:
862 remove_proc_entry("i8k", NULL);
863 return err;
864}
865
866static void __exit i8k_exit(void)
867{
868 hwmon_device_unregister(i8k_hwmon_dev);
869 remove_proc_entry("i8k", NULL);
870}
871
872module_init(i8k_init);
873module_exit(i8k_exit);
874
