2 * i8k.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 Guenter Roeck <linux@roeck-us.net>
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
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.
21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
35 #include <linux/sched.h>
37 #include <linux/i8k.h>
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
48 #define I8K_FAN_MULT 30
49 #define I8K_MAX_TEMP 127
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
58 #define I8K_POWER_AC 0x05
59 #define I8K_POWER_BATTERY 0x01
61 #define I8K_TEMPERATURE_BUG 1
63 static DEFINE_MUTEX(i8k_mutex
);
64 static char bios_version
[4];
65 static struct device
*i8k_hwmon_dev
;
66 static u32 i8k_hwmon_flags
;
67 static int i8k_fan_mult
;
68 static int i8k_pwm_mult
;
69 static int i8k_fan_max
= I8K_FAN_HIGH
;
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)
78 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
79 MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
80 MODULE_LICENSE("GPL");
83 module_param(force
, bool, 0);
84 MODULE_PARM_DESC(force
, "Force loading without checking for supported models");
86 static bool ignore_dmi
;
87 module_param(ignore_dmi
, bool, 0);
88 MODULE_PARM_DESC(ignore_dmi
, "Continue probing hardware even if DMI data does not match");
90 static bool restricted
;
91 module_param(restricted
, bool, 0);
92 MODULE_PARM_DESC(restricted
, "Allow fan control if SYS_ADMIN capability set");
94 static bool power_status
;
95 module_param(power_status
, bool, 0600);
96 MODULE_PARM_DESC(power_status
, "Report power status in /proc/i8k");
98 static int fan_mult
= I8K_FAN_MULT
;
99 module_param(fan_mult
, int, 0);
100 MODULE_PARM_DESC(fan_mult
, "Factor to multiply fan speed with");
102 static int fan_max
= I8K_FAN_HIGH
;
103 module_param(fan_max
, int, 0);
104 MODULE_PARM_DESC(fan_max
, "Maximum configurable fan speed");
106 static int i8k_open_fs(struct inode
*inode
, struct file
*file
);
107 static long i8k_ioctl(struct file
*, unsigned int, unsigned long);
109 static const struct file_operations i8k_fops
= {
110 .owner
= THIS_MODULE
,
114 .release
= single_release
,
115 .unlocked_ioctl
= i8k_ioctl
,
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
;
127 static inline const char *i8k_get_dmi_data(int field
)
129 const char *dmi_data
= dmi_get_system_info(field
);
131 return dmi_data
&& *dmi_data
? dmi_data
: "?";
135 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
137 static int i8k_smm(struct smm_regs
*regs
)
141 cpumask_var_t old_mask
;
143 /* SMM requires CPU 0 */
144 if (!alloc_cpumask_var(&old_mask
, GFP_KERNEL
))
146 cpumask_copy(old_mask
, ¤t
->cpus_allowed
);
147 rc
= set_cpus_allowed_ptr(current
, cpumask_of(0));
150 if (smp_processor_id() != 0) {
155 #if defined(CONFIG_X86_64)
156 asm volatile("pushq %%rax\n\t"
157 "movl 0(%%rax),%%edx\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"
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"
174 "movl %%edx,0(%%rax)\n\t"
180 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
182 asm volatile("pushl %%eax\n\t"
183 "movl 0(%%eax),%%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"
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"
200 "movl %%edx,0(%%eax)\n\t"
206 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
208 if (rc
!= 0 || (regs
->eax
& 0xffff) == 0xffff || regs
->eax
== eax
)
212 set_cpus_allowed_ptr(current
, old_mask
);
213 free_cpumask_var(old_mask
);
218 * Read the Fn key status.
220 static int i8k_get_fn_status(void)
222 struct smm_regs regs
= { .eax
= I8K_SMM_FN_STATUS
, };
229 switch ((regs
.eax
>> I8K_FN_SHIFT
) & I8K_FN_MASK
) {
242 * Read the power status.
244 static int i8k_get_power_status(void)
246 struct smm_regs regs
= { .eax
= I8K_SMM_POWER_STATUS
, };
253 return (regs
.eax
& 0xff) == I8K_POWER_AC
? I8K_AC
: I8K_BATTERY
;
257 * Read the fan status.
259 static int i8k_get_fan_status(int fan
)
261 struct smm_regs regs
= { .eax
= I8K_SMM_GET_FAN
, };
263 regs
.ebx
= fan
& 0xff;
264 return i8k_smm(®s
) ? : regs
.eax
& 0xff;
268 * Read the fan speed in RPM.
270 static int i8k_get_fan_speed(int fan
)
272 struct smm_regs regs
= { .eax
= I8K_SMM_GET_SPEED
, };
274 regs
.ebx
= fan
& 0xff;
275 return i8k_smm(®s
) ? : (regs
.eax
& 0xffff) * i8k_fan_mult
;
279 * Set the fan speed (off, low, high). Returns the new fan status.
281 static int i8k_set_fan(int fan
, int speed
)
283 struct smm_regs regs
= { .eax
= I8K_SMM_SET_FAN
, };
285 speed
= (speed
< 0) ? 0 : ((speed
> i8k_fan_max
) ? i8k_fan_max
: speed
);
286 regs
.ebx
= (fan
& 0xff) | (speed
<< 8);
288 return i8k_smm(®s
) ? : i8k_get_fan_status(fan
);
292 * Read the cpu temperature.
294 static int i8k_get_temp(int sensor
)
296 struct smm_regs regs
= { .eax
= I8K_SMM_GET_TEMP
, };
300 #ifdef I8K_TEMPERATURE_BUG
303 regs
.ebx
= sensor
& 0xff;
308 temp
= regs
.eax
& 0xff;
310 #ifdef I8K_TEMPERATURE_BUG
312 * Sometimes the temperature sensor returns 0x99, which is out of range.
313 * In this case we return (once) the previous cached value. For example:
314 # 1003655137 00000058 00005a4b
315 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
316 # 1003655139 00000054 00005c52
318 if (temp
> I8K_MAX_TEMP
) {
320 prev
[sensor
] = I8K_MAX_TEMP
;
329 static int i8k_get_dell_signature(int req_fn
)
331 struct smm_regs regs
= { .eax
= req_fn
, };
338 return regs
.eax
== 1145651527 && regs
.edx
== 1145392204 ? 0 : -1;
342 i8k_ioctl_unlocked(struct file
*fp
, unsigned int cmd
, unsigned long arg
)
346 unsigned char buff
[16];
347 int __user
*argp
= (int __user
*)arg
;
353 case I8K_BIOS_VERSION
:
354 val
= (bios_version
[0] << 16) |
355 (bios_version
[1] << 8) | bios_version
[2];
360 strlcpy(buff
, i8k_get_dmi_data(DMI_PRODUCT_SERIAL
),
365 val
= i8k_get_fn_status();
368 case I8K_POWER_STATUS
:
369 val
= i8k_get_power_status();
373 val
= i8k_get_temp(0);
377 if (copy_from_user(&val
, argp
, sizeof(int)))
380 val
= i8k_get_fan_speed(val
);
384 if (copy_from_user(&val
, argp
, sizeof(int)))
387 val
= i8k_get_fan_status(val
);
391 if (restricted
&& !capable(CAP_SYS_ADMIN
))
394 if (copy_from_user(&val
, argp
, sizeof(int)))
397 if (copy_from_user(&speed
, argp
+ 1, sizeof(int)))
400 val
= i8k_set_fan(val
, speed
);
411 case I8K_BIOS_VERSION
:
412 if (copy_to_user(argp
, &val
, 4))
417 if (copy_to_user(argp
, buff
, 16))
422 if (copy_to_user(argp
, &val
, sizeof(int)))
431 static long i8k_ioctl(struct file
*fp
, unsigned int cmd
, unsigned long arg
)
435 mutex_lock(&i8k_mutex
);
436 ret
= i8k_ioctl_unlocked(fp
, cmd
, arg
);
437 mutex_unlock(&i8k_mutex
);
443 * Print the information for /proc/i8k.
445 static int i8k_proc_show(struct seq_file
*seq
, void *offset
)
447 int fn_key
, cpu_temp
, ac_power
;
448 int left_fan
, right_fan
, left_speed
, right_speed
;
450 cpu_temp
= i8k_get_temp(0); /* 11100 µs */
451 left_fan
= i8k_get_fan_status(I8K_FAN_LEFT
); /* 580 µs */
452 right_fan
= i8k_get_fan_status(I8K_FAN_RIGHT
); /* 580 µs */
453 left_speed
= i8k_get_fan_speed(I8K_FAN_LEFT
); /* 580 µs */
454 right_speed
= i8k_get_fan_speed(I8K_FAN_RIGHT
); /* 580 µs */
455 fn_key
= i8k_get_fn_status(); /* 750 µs */
457 ac_power
= i8k_get_power_status(); /* 14700 µs */
464 * 1) Format version (this will change if format changes)
469 * 6) Right fan status
475 return seq_printf(seq
, "%s %s %s %d %d %d %d %d %d %d\n",
478 i8k_get_dmi_data(DMI_PRODUCT_SERIAL
),
480 left_fan
, right_fan
, left_speed
, right_speed
,
484 static int i8k_open_fs(struct inode
*inode
, struct file
*file
)
486 return single_open(file
, i8k_proc_show
, NULL
);
494 static ssize_t
i8k_hwmon_show_temp(struct device
*dev
,
495 struct device_attribute
*devattr
,
498 int index
= to_sensor_dev_attr(devattr
)->index
;
501 temp
= i8k_get_temp(index
);
504 return sprintf(buf
, "%d\n", temp
* 1000);
507 static ssize_t
i8k_hwmon_show_fan(struct device
*dev
,
508 struct device_attribute
*devattr
,
511 int index
= to_sensor_dev_attr(devattr
)->index
;
514 fan_speed
= i8k_get_fan_speed(index
);
517 return sprintf(buf
, "%d\n", fan_speed
);
520 static ssize_t
i8k_hwmon_show_pwm(struct device
*dev
,
521 struct device_attribute
*devattr
,
524 int index
= to_sensor_dev_attr(devattr
)->index
;
527 status
= i8k_get_fan_status(index
);
530 return sprintf(buf
, "%d\n", clamp_val(status
* i8k_pwm_mult
, 0, 255));
533 static ssize_t
i8k_hwmon_set_pwm(struct device
*dev
,
534 struct device_attribute
*attr
,
535 const char *buf
, size_t count
)
537 int index
= to_sensor_dev_attr(attr
)->index
;
541 err
= kstrtoul(buf
, 10, &val
);
544 val
= clamp_val(DIV_ROUND_CLOSEST(val
, i8k_pwm_mult
), 0, i8k_fan_max
);
546 mutex_lock(&i8k_mutex
);
547 err
= i8k_set_fan(index
, val
);
548 mutex_unlock(&i8k_mutex
);
550 return err
< 0 ? -EIO
: count
;
553 static SENSOR_DEVICE_ATTR(temp1_input
, S_IRUGO
, i8k_hwmon_show_temp
, NULL
, 0);
554 static SENSOR_DEVICE_ATTR(temp2_input
, S_IRUGO
, i8k_hwmon_show_temp
, NULL
, 1);
555 static SENSOR_DEVICE_ATTR(temp3_input
, S_IRUGO
, i8k_hwmon_show_temp
, NULL
, 2);
556 static SENSOR_DEVICE_ATTR(temp4_input
, S_IRUGO
, i8k_hwmon_show_temp
, NULL
, 3);
557 static SENSOR_DEVICE_ATTR(fan1_input
, S_IRUGO
, i8k_hwmon_show_fan
, NULL
,
559 static SENSOR_DEVICE_ATTR(pwm1
, S_IRUGO
| S_IWUSR
, i8k_hwmon_show_pwm
,
560 i8k_hwmon_set_pwm
, I8K_FAN_LEFT
);
561 static SENSOR_DEVICE_ATTR(fan2_input
, S_IRUGO
, i8k_hwmon_show_fan
, NULL
,
563 static SENSOR_DEVICE_ATTR(pwm2
, S_IRUGO
| S_IWUSR
, i8k_hwmon_show_pwm
,
564 i8k_hwmon_set_pwm
, I8K_FAN_RIGHT
);
566 static struct attribute
*i8k_attrs
[] = {
567 &sensor_dev_attr_temp1_input
.dev_attr
.attr
, /* 0 */
568 &sensor_dev_attr_temp2_input
.dev_attr
.attr
, /* 1 */
569 &sensor_dev_attr_temp3_input
.dev_attr
.attr
, /* 2 */
570 &sensor_dev_attr_temp4_input
.dev_attr
.attr
, /* 3 */
571 &sensor_dev_attr_fan1_input
.dev_attr
.attr
, /* 4 */
572 &sensor_dev_attr_pwm1
.dev_attr
.attr
, /* 5 */
573 &sensor_dev_attr_fan2_input
.dev_attr
.attr
, /* 6 */
574 &sensor_dev_attr_pwm2
.dev_attr
.attr
, /* 7 */
578 static umode_t
i8k_is_visible(struct kobject
*kobj
, struct attribute
*attr
,
581 if (index
== 0 && !(i8k_hwmon_flags
& I8K_HWMON_HAVE_TEMP1
))
583 if (index
== 1 && !(i8k_hwmon_flags
& I8K_HWMON_HAVE_TEMP2
))
585 if (index
== 2 && !(i8k_hwmon_flags
& I8K_HWMON_HAVE_TEMP3
))
587 if (index
== 3 && !(i8k_hwmon_flags
& I8K_HWMON_HAVE_TEMP4
))
589 if (index
>= 4 && index
<= 5 &&
590 !(i8k_hwmon_flags
& I8K_HWMON_HAVE_FAN1
))
592 if (index
>= 6 && index
<= 7 &&
593 !(i8k_hwmon_flags
& I8K_HWMON_HAVE_FAN2
))
599 static const struct attribute_group i8k_group
= {
601 .is_visible
= i8k_is_visible
,
603 __ATTRIBUTE_GROUPS(i8k
);
605 static int __init
i8k_init_hwmon(void)
611 /* CPU temperature attributes, if temperature reading is OK */
612 err
= i8k_get_temp(0);
614 i8k_hwmon_flags
|= I8K_HWMON_HAVE_TEMP1
;
615 /* check for additional temperature sensors */
616 err
= i8k_get_temp(1);
618 i8k_hwmon_flags
|= I8K_HWMON_HAVE_TEMP2
;
619 err
= i8k_get_temp(2);
621 i8k_hwmon_flags
|= I8K_HWMON_HAVE_TEMP3
;
622 err
= i8k_get_temp(3);
624 i8k_hwmon_flags
|= I8K_HWMON_HAVE_TEMP4
;
626 /* Left fan attributes, if left fan is present */
627 err
= i8k_get_fan_status(I8K_FAN_LEFT
);
629 i8k_hwmon_flags
|= I8K_HWMON_HAVE_FAN1
;
631 /* Right fan attributes, if right fan is present */
632 err
= i8k_get_fan_status(I8K_FAN_RIGHT
);
634 i8k_hwmon_flags
|= I8K_HWMON_HAVE_FAN2
;
636 i8k_hwmon_dev
= hwmon_device_register_with_groups(NULL
, "i8k", NULL
,
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
);
647 struct i8k_config_data
{
660 static const struct i8k_config_data i8k_config_data
[] = {
661 [DELL_LATITUDE_D520
] = {
663 .fan_max
= I8K_FAN_TURBO
,
665 [DELL_LATITUDE_E6540
] = {
667 .fan_max
= I8K_FAN_HIGH
,
669 [DELL_PRECISION_490
] = {
671 .fan_max
= I8K_FAN_TURBO
,
675 .fan_max
= I8K_FAN_HIGH
,
679 .fan_max
= I8K_FAN_HIGH
,
683 static struct dmi_system_id i8k_dmi_table
[] __initdata
= {
685 .ident
= "Dell Inspiron",
687 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Computer"),
688 DMI_MATCH(DMI_PRODUCT_NAME
, "Inspiron"),
692 .ident
= "Dell Latitude",
694 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Computer"),
695 DMI_MATCH(DMI_PRODUCT_NAME
, "Latitude"),
699 .ident
= "Dell Inspiron 2",
701 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
702 DMI_MATCH(DMI_PRODUCT_NAME
, "Inspiron"),
706 .ident
= "Dell Latitude D520",
708 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
709 DMI_MATCH(DMI_PRODUCT_NAME
, "Latitude D520"),
711 .driver_data
= (void *)&i8k_config_data
[DELL_LATITUDE_D520
],
714 .ident
= "Dell Latitude E6540",
716 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
717 DMI_MATCH(DMI_PRODUCT_NAME
, "Latitude E6540"),
719 .driver_data
= (void *)&i8k_config_data
[DELL_LATITUDE_E6540
],
722 .ident
= "Dell Latitude 2",
724 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
725 DMI_MATCH(DMI_PRODUCT_NAME
, "Latitude"),
728 { /* UK Inspiron 6400 */
729 .ident
= "Dell Inspiron 3",
731 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
732 DMI_MATCH(DMI_PRODUCT_NAME
, "MM061"),
736 .ident
= "Dell Inspiron 3",
738 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
739 DMI_MATCH(DMI_PRODUCT_NAME
, "MP061"),
743 .ident
= "Dell Precision 490",
745 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
746 DMI_MATCH(DMI_PRODUCT_NAME
,
747 "Precision WorkStation 490"),
749 .driver_data
= (void *)&i8k_config_data
[DELL_PRECISION_490
],
752 .ident
= "Dell Precision",
754 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
755 DMI_MATCH(DMI_PRODUCT_NAME
, "Precision"),
759 .ident
= "Dell Vostro",
761 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
762 DMI_MATCH(DMI_PRODUCT_NAME
, "Vostro"),
766 .ident
= "Dell XPS421",
768 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
769 DMI_MATCH(DMI_PRODUCT_NAME
, "XPS L421X"),
773 .ident
= "Dell Studio",
775 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
776 DMI_MATCH(DMI_PRODUCT_NAME
, "Studio"),
778 .driver_data
= (void *)&i8k_config_data
[DELL_STUDIO
],
781 .ident
= "Dell XPS M140",
783 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
784 DMI_MATCH(DMI_PRODUCT_NAME
, "MXC051"),
786 .driver_data
= (void *)&i8k_config_data
[DELL_XPS_M140
],
792 * Probe for the presence of a supported laptop.
794 static int __init
i8k_probe(void)
796 const struct dmi_system_id
*id
;
799 * Get DMI information
801 if (!dmi_check_system(i8k_dmi_table
)) {
802 if (!ignore_dmi
&& !force
)
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
));
812 strlcpy(bios_version
, i8k_get_dmi_data(DMI_BIOS_VERSION
),
813 sizeof(bios_version
));
816 * Get SMM Dell signature
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");
825 i8k_fan_mult
= fan_mult
;
826 i8k_fan_max
= fan_max
? : I8K_FAN_HIGH
; /* Must not be 0 */
827 id
= dmi_first_match(i8k_dmi_table
);
828 if (id
&& id
->driver_data
) {
829 const struct i8k_config_data
*conf
= id
->driver_data
;
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
;
836 i8k_pwm_mult
= DIV_ROUND_UP(255, i8k_fan_max
);
841 static int __init
i8k_init(void)
843 struct proc_dir_entry
*proc_i8k
;
846 /* Are we running on an supported laptop? */
850 /* Register the proc entry */
851 proc_i8k
= proc_create("i8k", 0, NULL
, &i8k_fops
);
855 err
= i8k_init_hwmon();
857 goto exit_remove_proc
;
862 remove_proc_entry("i8k", NULL
);
866 static void __exit
i8k_exit(void)
868 hwmon_device_unregister(i8k_hwmon_dev
);
869 remove_proc_entry("i8k", NULL
);
872 module_init(i8k_init
);
873 module_exit(i8k_exit
);