2 * dell-smm-hwmon.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
4 * Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org>
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>
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
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.
22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
37 #include <linux/sched.h>
39 #include <linux/i8k.h>
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
53 #define I8K_FAN_MULT 30
54 #define I8K_FAN_MAX_RPM 30000
55 #define I8K_MAX_TEMP 127
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
64 #define I8K_POWER_AC 0x05
65 #define I8K_POWER_BATTERY 0x01
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
;
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)
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");
89 module_param(force
, bool, 0);
90 MODULE_PARM_DESC(force
, "Force loading without checking for supported models");
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");
96 static bool restricted
;
97 module_param(restricted
, bool, 0);
98 MODULE_PARM_DESC(restricted
, "Allow fan control if SYS_ADMIN capability set");
100 static bool power_status
;
101 module_param(power_status
, bool, 0600);
102 MODULE_PARM_DESC(power_status
, "Report power status in /proc/i8k");
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)");
109 module_param(fan_max
, uint
, 0);
110 MODULE_PARM_DESC(fan_max
, "Maximum configurable fan speed (default: autodetect)");
112 static int i8k_open_fs(struct inode
*inode
, struct file
*file
);
113 static long i8k_ioctl(struct file
*, unsigned int, unsigned long);
115 static const struct file_operations i8k_fops
= {
116 .owner
= THIS_MODULE
,
120 .release
= single_release
,
121 .unlocked_ioctl
= i8k_ioctl
,
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
;
133 static inline const char *i8k_get_dmi_data(int field
)
135 const char *dmi_data
= dmi_get_system_info(field
);
137 return dmi_data
&& *dmi_data
? dmi_data
: "?";
141 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
143 static int i8k_smm(struct smm_regs
*regs
)
147 cpumask_var_t old_mask
;
149 /* SMM requires CPU 0 */
150 if (!alloc_cpumask_var(&old_mask
, GFP_KERNEL
))
152 cpumask_copy(old_mask
, ¤t
->cpus_allowed
);
153 rc
= set_cpus_allowed_ptr(current
, cpumask_of(0));
156 if (smp_processor_id() != 0) {
161 #if defined(CONFIG_X86_64)
162 asm volatile("pushq %%rax\n\t"
163 "movl 0(%%rax),%%edx\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"
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"
180 "movl %%edx,0(%%rax)\n\t"
186 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
188 asm volatile("pushl %%eax\n\t"
189 "movl 0(%%eax),%%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"
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"
206 "movl %%edx,0(%%eax)\n\t"
212 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
214 if (rc
!= 0 || (regs
->eax
& 0xffff) == 0xffff || regs
->eax
== eax
)
218 set_cpus_allowed_ptr(current
, old_mask
);
219 free_cpumask_var(old_mask
);
224 * Read the Fn key status.
226 static int i8k_get_fn_status(void)
228 struct smm_regs regs
= { .eax
= I8K_SMM_FN_STATUS
, };
235 switch ((regs
.eax
>> I8K_FN_SHIFT
) & I8K_FN_MASK
) {
248 * Read the power status.
250 static int i8k_get_power_status(void)
252 struct smm_regs regs
= { .eax
= I8K_SMM_POWER_STATUS
, };
259 return (regs
.eax
& 0xff) == I8K_POWER_AC
? I8K_AC
: I8K_BATTERY
;
263 * Read the fan status.
265 static int i8k_get_fan_status(int fan
)
267 struct smm_regs regs
= { .eax
= I8K_SMM_GET_FAN
, };
269 regs
.ebx
= fan
& 0xff;
270 return i8k_smm(®s
) ? : regs
.eax
& 0xff;
274 * Read the fan speed in RPM.
276 static int i8k_get_fan_speed(int fan
)
278 struct smm_regs regs
= { .eax
= I8K_SMM_GET_SPEED
, };
280 regs
.ebx
= fan
& 0xff;
281 return i8k_smm(®s
) ? : (regs
.eax
& 0xffff) * i8k_fan_mult
;
287 static int i8k_get_fan_type(int fan
)
289 struct smm_regs regs
= { .eax
= I8K_SMM_GET_FAN_TYPE
, };
291 regs
.ebx
= fan
& 0xff;
292 return i8k_smm(®s
) ? : regs
.eax
& 0xff;
296 * Read the fan nominal rpm for specific fan speed.
298 static int i8k_get_fan_nominal_speed(int fan
, int speed
)
300 struct smm_regs regs
= { .eax
= I8K_SMM_GET_NOM_SPEED
, };
302 regs
.ebx
= (fan
& 0xff) | (speed
<< 8);
303 return i8k_smm(®s
) ? : (regs
.eax
& 0xffff) * i8k_fan_mult
;
307 * Set the fan speed (off, low, high). Returns the new fan status.
309 static int i8k_set_fan(int fan
, int speed
)
311 struct smm_regs regs
= { .eax
= I8K_SMM_SET_FAN
, };
313 speed
= (speed
< 0) ? 0 : ((speed
> i8k_fan_max
) ? i8k_fan_max
: speed
);
314 regs
.ebx
= (fan
& 0xff) | (speed
<< 8);
316 return i8k_smm(®s
) ? : i8k_get_fan_status(fan
);
319 static int i8k_get_temp_type(int sensor
)
321 struct smm_regs regs
= { .eax
= I8K_SMM_GET_TEMP_TYPE
, };
323 regs
.ebx
= sensor
& 0xff;
324 return i8k_smm(®s
) ? : regs
.eax
& 0xff;
328 * Read the cpu temperature.
330 static int _i8k_get_temp(int sensor
)
332 struct smm_regs regs
= {
333 .eax
= I8K_SMM_GET_TEMP
,
334 .ebx
= sensor
& 0xff,
337 return i8k_smm(®s
) ? : regs
.eax
& 0xff;
340 static int i8k_get_temp(int sensor
)
342 int temp
= _i8k_get_temp(sensor
);
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
353 temp
= _i8k_get_temp(sensor
);
356 * Return -ENODATA for all invalid temperatures.
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
363 if (temp
> I8K_MAX_TEMP
)
369 static int i8k_get_dell_signature(int req_fn
)
371 struct smm_regs regs
= { .eax
= req_fn
, };
378 return regs
.eax
== 1145651527 && regs
.edx
== 1145392204 ? 0 : -1;
382 i8k_ioctl_unlocked(struct file
*fp
, unsigned int cmd
, unsigned long arg
)
386 unsigned char buff
[16];
387 int __user
*argp
= (int __user
*)arg
;
393 case I8K_BIOS_VERSION
:
394 val
= (bios_version
[0] << 16) |
395 (bios_version
[1] << 8) | bios_version
[2];
400 strlcpy(buff
, i8k_get_dmi_data(DMI_PRODUCT_SERIAL
),
405 val
= i8k_get_fn_status();
408 case I8K_POWER_STATUS
:
409 val
= i8k_get_power_status();
413 val
= i8k_get_temp(0);
417 if (copy_from_user(&val
, argp
, sizeof(int)))
420 val
= i8k_get_fan_speed(val
);
424 if (copy_from_user(&val
, argp
, sizeof(int)))
427 val
= i8k_get_fan_status(val
);
431 if (restricted
&& !capable(CAP_SYS_ADMIN
))
434 if (copy_from_user(&val
, argp
, sizeof(int)))
437 if (copy_from_user(&speed
, argp
+ 1, sizeof(int)))
440 val
= i8k_set_fan(val
, speed
);
451 case I8K_BIOS_VERSION
:
452 if (copy_to_user(argp
, &val
, 4))
457 if (copy_to_user(argp
, buff
, 16))
462 if (copy_to_user(argp
, &val
, sizeof(int)))
471 static long i8k_ioctl(struct file
*fp
, unsigned int cmd
, unsigned long arg
)
475 mutex_lock(&i8k_mutex
);
476 ret
= i8k_ioctl_unlocked(fp
, cmd
, arg
);
477 mutex_unlock(&i8k_mutex
);
483 * Print the information for /proc/i8k.
485 static int i8k_proc_show(struct seq_file
*seq
, void *offset
)
487 int fn_key
, cpu_temp
, ac_power
;
488 int left_fan
, right_fan
, left_speed
, right_speed
;
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 */
497 ac_power
= i8k_get_power_status(); /* 14700 µs */
504 * 1) Format version (this will change if format changes)
509 * 6) Right fan status
515 seq_printf(seq
, "%s %s %s %d %d %d %d %d %d %d\n",
518 i8k_get_dmi_data(DMI_PRODUCT_SERIAL
),
520 left_fan
, right_fan
, left_speed
, right_speed
,
526 static int i8k_open_fs(struct inode
*inode
, struct file
*file
)
528 return single_open(file
, i8k_proc_show
, NULL
);
536 static ssize_t
i8k_hwmon_show_temp_label(struct device
*dev
,
537 struct device_attribute
*devattr
,
540 static const char * const labels
[] = {
548 int index
= to_sensor_dev_attr(devattr
)->index
;
551 type
= i8k_get_temp_type(index
);
554 if (type
>= ARRAY_SIZE(labels
))
555 type
= ARRAY_SIZE(labels
) - 1;
556 return sprintf(buf
, "%s\n", labels
[type
]);
559 static ssize_t
i8k_hwmon_show_temp(struct device
*dev
,
560 struct device_attribute
*devattr
,
563 int index
= to_sensor_dev_attr(devattr
)->index
;
566 temp
= i8k_get_temp(index
);
569 return sprintf(buf
, "%d\n", temp
* 1000);
572 static ssize_t
i8k_hwmon_show_fan_label(struct device
*dev
,
573 struct device_attribute
*devattr
,
576 static const char * const labels
[] = {
584 int index
= to_sensor_dev_attr(devattr
)->index
;
588 type
= i8k_get_fan_type(index
);
597 if (type
>= ARRAY_SIZE(labels
))
598 type
= (ARRAY_SIZE(labels
) - 1);
600 return sprintf(buf
, "%s%s\n", (dock
? "Docking " : ""), labels
[type
]);
603 static ssize_t
i8k_hwmon_show_fan(struct device
*dev
,
604 struct device_attribute
*devattr
,
607 int index
= to_sensor_dev_attr(devattr
)->index
;
610 fan_speed
= i8k_get_fan_speed(index
);
613 return sprintf(buf
, "%d\n", fan_speed
);
616 static ssize_t
i8k_hwmon_show_pwm(struct device
*dev
,
617 struct device_attribute
*devattr
,
620 int index
= to_sensor_dev_attr(devattr
)->index
;
623 status
= i8k_get_fan_status(index
);
626 return sprintf(buf
, "%d\n", clamp_val(status
* i8k_pwm_mult
, 0, 255));
629 static ssize_t
i8k_hwmon_set_pwm(struct device
*dev
,
630 struct device_attribute
*attr
,
631 const char *buf
, size_t count
)
633 int index
= to_sensor_dev_attr(attr
)->index
;
637 err
= kstrtoul(buf
, 10, &val
);
640 val
= clamp_val(DIV_ROUND_CLOSEST(val
, i8k_pwm_mult
), 0, i8k_fan_max
);
642 mutex_lock(&i8k_mutex
);
643 err
= i8k_set_fan(index
, val
);
644 mutex_unlock(&i8k_mutex
);
646 return err
< 0 ? -EIO
: count
;
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
,
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
,
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
,
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
,
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
,
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
,
668 static SENSOR_DEVICE_ATTR(fan2_label
, S_IRUGO
, i8k_hwmon_show_fan_label
, NULL
,
670 static SENSOR_DEVICE_ATTR(pwm2
, S_IRUGO
| S_IWUSR
, i8k_hwmon_show_pwm
,
671 i8k_hwmon_set_pwm
, 1);
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 */
691 static umode_t
i8k_is_visible(struct kobject
*kobj
, struct attribute
*attr
,
694 if (index
>= 0 && index
<= 1 &&
695 !(i8k_hwmon_flags
& I8K_HWMON_HAVE_TEMP1
))
697 if (index
>= 2 && index
<= 3 &&
698 !(i8k_hwmon_flags
& I8K_HWMON_HAVE_TEMP2
))
700 if (index
>= 4 && index
<= 5 &&
701 !(i8k_hwmon_flags
& I8K_HWMON_HAVE_TEMP3
))
703 if (index
>= 6 && index
<= 7 &&
704 !(i8k_hwmon_flags
& I8K_HWMON_HAVE_TEMP4
))
706 if (index
>= 8 && index
<= 10 &&
707 !(i8k_hwmon_flags
& I8K_HWMON_HAVE_FAN1
))
709 if (index
>= 11 && index
<= 13 &&
710 !(i8k_hwmon_flags
& I8K_HWMON_HAVE_FAN2
))
716 static const struct attribute_group i8k_group
= {
718 .is_visible
= i8k_is_visible
,
720 __ATTRIBUTE_GROUPS(i8k
);
722 static int __init
i8k_init_hwmon(void)
728 /* CPU temperature attributes, if temperature type is OK */
729 err
= i8k_get_temp_type(0);
731 i8k_hwmon_flags
|= I8K_HWMON_HAVE_TEMP1
;
732 /* check for additional temperature sensors */
733 err
= i8k_get_temp_type(1);
735 i8k_hwmon_flags
|= I8K_HWMON_HAVE_TEMP2
;
736 err
= i8k_get_temp_type(2);
738 i8k_hwmon_flags
|= I8K_HWMON_HAVE_TEMP3
;
739 err
= i8k_get_temp_type(3);
741 i8k_hwmon_flags
|= I8K_HWMON_HAVE_TEMP4
;
743 /* First fan attributes, if fan type is OK */
744 err
= i8k_get_fan_type(0);
746 i8k_hwmon_flags
|= I8K_HWMON_HAVE_FAN1
;
748 /* Second fan attributes, if fan type is OK */
749 err
= i8k_get_fan_type(1);
751 i8k_hwmon_flags
|= I8K_HWMON_HAVE_FAN2
;
753 i8k_hwmon_dev
= hwmon_device_register_with_groups(NULL
, "i8k", NULL
,
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
);
764 struct i8k_config_data
{
776 static const struct i8k_config_data i8k_config_data
[] = {
777 [DELL_LATITUDE_D520
] = {
779 .fan_max
= I8K_FAN_TURBO
,
781 [DELL_PRECISION_490
] = {
783 .fan_max
= I8K_FAN_TURBO
,
787 .fan_max
= I8K_FAN_HIGH
,
791 .fan_max
= I8K_FAN_HIGH
,
795 static struct dmi_system_id i8k_dmi_table
[] __initdata
= {
797 .ident
= "Dell Inspiron",
799 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Computer"),
800 DMI_MATCH(DMI_PRODUCT_NAME
, "Inspiron"),
804 .ident
= "Dell Latitude",
806 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Computer"),
807 DMI_MATCH(DMI_PRODUCT_NAME
, "Latitude"),
811 .ident
= "Dell Inspiron 2",
813 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
814 DMI_MATCH(DMI_PRODUCT_NAME
, "Inspiron"),
818 .ident
= "Dell Latitude D520",
820 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
821 DMI_MATCH(DMI_PRODUCT_NAME
, "Latitude D520"),
823 .driver_data
= (void *)&i8k_config_data
[DELL_LATITUDE_D520
],
826 .ident
= "Dell Latitude 2",
828 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
829 DMI_MATCH(DMI_PRODUCT_NAME
, "Latitude"),
832 { /* UK Inspiron 6400 */
833 .ident
= "Dell Inspiron 3",
835 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
836 DMI_MATCH(DMI_PRODUCT_NAME
, "MM061"),
840 .ident
= "Dell Inspiron 3",
842 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
843 DMI_MATCH(DMI_PRODUCT_NAME
, "MP061"),
847 .ident
= "Dell Precision 490",
849 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
850 DMI_MATCH(DMI_PRODUCT_NAME
,
851 "Precision WorkStation 490"),
853 .driver_data
= (void *)&i8k_config_data
[DELL_PRECISION_490
],
856 .ident
= "Dell Precision",
858 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
859 DMI_MATCH(DMI_PRODUCT_NAME
, "Precision"),
863 .ident
= "Dell Vostro",
865 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
866 DMI_MATCH(DMI_PRODUCT_NAME
, "Vostro"),
870 .ident
= "Dell XPS421",
872 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
873 DMI_MATCH(DMI_PRODUCT_NAME
, "XPS L421X"),
877 .ident
= "Dell Studio",
879 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
880 DMI_MATCH(DMI_PRODUCT_NAME
, "Studio"),
882 .driver_data
= (void *)&i8k_config_data
[DELL_STUDIO
],
885 .ident
= "Dell XPS 13",
887 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
888 DMI_MATCH(DMI_PRODUCT_NAME
, "XPS13"),
890 .driver_data
= (void *)&i8k_config_data
[DELL_XPS
],
893 .ident
= "Dell XPS M140",
895 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
896 DMI_MATCH(DMI_PRODUCT_NAME
, "MXC051"),
898 .driver_data
= (void *)&i8k_config_data
[DELL_XPS
],
903 MODULE_DEVICE_TABLE(dmi
, i8k_dmi_table
);
906 * Probe for the presence of a supported laptop.
908 static int __init
i8k_probe(void)
910 const struct dmi_system_id
*id
;
914 * Get DMI information
916 if (!dmi_check_system(i8k_dmi_table
)) {
917 if (!ignore_dmi
&& !force
)
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
));
927 strlcpy(bios_version
, i8k_get_dmi_data(DMI_BIOS_VERSION
),
928 sizeof(bios_version
));
931 * Get SMM Dell signature
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");
941 * Set fan multiplier and maximal fan speed from dmi config
942 * Values specified in module parameters override values from dmi
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
;
953 i8k_fan_max
= fan_max
? : I8K_FAN_HIGH
; /* Must not be 0 */
954 i8k_pwm_mult
= DIV_ROUND_UP(255, i8k_fan_max
);
958 * Autodetect fan multiplier based on nominal rpm
959 * If fan reports rpm value too high then set multiplier to 1
961 for (fan
= 0; fan
< 2; ++fan
) {
962 ret
= i8k_get_fan_nominal_speed(fan
, i8k_fan_max
);
965 if (ret
> I8K_FAN_MAX_RPM
)
970 /* Fan multiplier was specified in module param or in dmi */
971 i8k_fan_mult
= fan_mult
;
977 static int __init
i8k_init(void)
979 struct proc_dir_entry
*proc_i8k
;
982 /* Are we running on an supported laptop? */
986 /* Register the proc entry */
987 proc_i8k
= proc_create("i8k", 0, NULL
, &i8k_fops
);
991 err
= i8k_init_hwmon();
993 goto exit_remove_proc
;
998 remove_proc_entry("i8k", NULL
);
1002 static void __exit
i8k_exit(void)
1004 hwmon_device_unregister(i8k_hwmon_dev
);
1005 remove_proc_entry("i8k", NULL
);
1008 module_init(i8k_init
);
1009 module_exit(i8k_exit
);