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>
38 #include <linux/ctype.h>
40 #include <linux/i8k.h>
42 #define I8K_SMM_FN_STATUS 0x0025
43 #define I8K_SMM_POWER_STATUS 0x0069
44 #define I8K_SMM_SET_FAN 0x01a3
45 #define I8K_SMM_GET_FAN 0x00a3
46 #define I8K_SMM_GET_SPEED 0x02a3
47 #define I8K_SMM_GET_FAN_TYPE 0x03a3
48 #define I8K_SMM_GET_NOM_SPEED 0x04a3
49 #define I8K_SMM_GET_TEMP 0x10a3
50 #define I8K_SMM_GET_TEMP_TYPE 0x11a3
51 #define I8K_SMM_GET_DELL_SIG1 0xfea3
52 #define I8K_SMM_GET_DELL_SIG2 0xffa3
54 #define I8K_FAN_MULT 30
55 #define I8K_FAN_MAX_RPM 30000
56 #define I8K_MAX_TEMP 127
58 #define I8K_FN_NONE 0x00
59 #define I8K_FN_UP 0x01
60 #define I8K_FN_DOWN 0x02
61 #define I8K_FN_MUTE 0x04
62 #define I8K_FN_MASK 0x07
63 #define I8K_FN_SHIFT 8
65 #define I8K_POWER_AC 0x05
66 #define I8K_POWER_BATTERY 0x01
68 static DEFINE_MUTEX(i8k_mutex);
69 static char bios_version[4];
70 static char bios_machineid[16];
71 static struct device *i8k_hwmon_dev;
72 static u32 i8k_hwmon_flags;
73 static uint i8k_fan_mult = I8K_FAN_MULT;
74 static uint i8k_pwm_mult;
75 static uint i8k_fan_max = I8K_FAN_HIGH;
76 static bool disallow_fan_type_call;
78 #define I8K_HWMON_HAVE_TEMP1 (1 << 0)
79 #define I8K_HWMON_HAVE_TEMP2 (1 << 1)
80 #define I8K_HWMON_HAVE_TEMP3 (1 << 2)
81 #define I8K_HWMON_HAVE_TEMP4 (1 << 3)
82 #define I8K_HWMON_HAVE_FAN1 (1 << 4)
83 #define I8K_HWMON_HAVE_FAN2 (1 << 5)
85 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
86 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
87 MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver");
88 MODULE_LICENSE("GPL");
92 module_param(force, bool, 0);
93 MODULE_PARM_DESC(force, "Force loading without checking for supported models");
95 static bool ignore_dmi;
96 module_param(ignore_dmi, bool, 0);
97 MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
99 #if IS_ENABLED(CONFIG_I8K)
100 static bool restricted = true;
101 module_param(restricted, bool, 0);
102 MODULE_PARM_DESC(restricted, "Restrict fan control and serial number to CAP_SYS_ADMIN (default: 1)");
104 static bool power_status;
105 module_param(power_status, bool, 0600);
106 MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k (default: 0)");
109 static uint fan_mult;
110 module_param(fan_mult, uint, 0);
111 MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)");
114 module_param(fan_max, uint, 0);
115 MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)");
119 unsigned int ebx __packed;
120 unsigned int ecx __packed;
121 unsigned int edx __packed;
122 unsigned int esi __packed;
123 unsigned int edi __packed;
126 static inline const char *i8k_get_dmi_data(int field)
128 const char *dmi_data = dmi_get_system_info(field);
130 return dmi_data && *dmi_data ? dmi_data : "?";
134 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
136 static int i8k_smm(struct smm_regs *regs)
140 cpumask_var_t old_mask;
142 /* SMM requires CPU 0 */
143 if (!alloc_cpumask_var(&old_mask, GFP_KERNEL))
145 cpumask_copy(old_mask, ¤t->cpus_allowed);
146 rc = set_cpus_allowed_ptr(current, cpumask_of(0));
149 if (smp_processor_id() != 0) {
154 #if defined(CONFIG_X86_64)
155 asm volatile("pushq %%rax\n\t"
156 "movl 0(%%rax),%%edx\n\t"
158 "movl 4(%%rax),%%ebx\n\t"
159 "movl 8(%%rax),%%ecx\n\t"
160 "movl 12(%%rax),%%edx\n\t"
161 "movl 16(%%rax),%%esi\n\t"
162 "movl 20(%%rax),%%edi\n\t"
166 "xchgq %%rax,(%%rsp)\n\t"
167 "movl %%ebx,4(%%rax)\n\t"
168 "movl %%ecx,8(%%rax)\n\t"
169 "movl %%edx,12(%%rax)\n\t"
170 "movl %%esi,16(%%rax)\n\t"
171 "movl %%edi,20(%%rax)\n\t"
173 "movl %%edx,0(%%rax)\n\t"
179 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
181 asm volatile("pushl %%eax\n\t"
182 "movl 0(%%eax),%%edx\n\t"
184 "movl 4(%%eax),%%ebx\n\t"
185 "movl 8(%%eax),%%ecx\n\t"
186 "movl 12(%%eax),%%edx\n\t"
187 "movl 16(%%eax),%%esi\n\t"
188 "movl 20(%%eax),%%edi\n\t"
192 "xchgl %%eax,(%%esp)\n\t"
193 "movl %%ebx,4(%%eax)\n\t"
194 "movl %%ecx,8(%%eax)\n\t"
195 "movl %%edx,12(%%eax)\n\t"
196 "movl %%esi,16(%%eax)\n\t"
197 "movl %%edi,20(%%eax)\n\t"
199 "movl %%edx,0(%%eax)\n\t"
205 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
207 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
211 set_cpus_allowed_ptr(current, old_mask);
212 free_cpumask_var(old_mask);
217 * Read the fan status.
219 static int i8k_get_fan_status(int fan)
221 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
223 regs.ebx = fan & 0xff;
224 return i8k_smm(®s) ? : regs.eax & 0xff;
228 * Read the fan speed in RPM.
230 static int i8k_get_fan_speed(int fan)
232 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
234 regs.ebx = fan & 0xff;
235 return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult;
241 static int i8k_get_fan_type(int fan)
243 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, };
245 if (disallow_fan_type_call)
248 regs.ebx = fan & 0xff;
249 return i8k_smm(®s) ? : regs.eax & 0xff;
253 * Read the fan nominal rpm for specific fan speed.
255 static int i8k_get_fan_nominal_speed(int fan, int speed)
257 struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, };
259 regs.ebx = (fan & 0xff) | (speed << 8);
260 return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult;
264 * Set the fan speed (off, low, high). Returns the new fan status.
266 static int i8k_set_fan(int fan, int speed)
268 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
270 speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed);
271 regs.ebx = (fan & 0xff) | (speed << 8);
273 return i8k_smm(®s) ? : i8k_get_fan_status(fan);
276 static int i8k_get_temp_type(int sensor)
278 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, };
280 regs.ebx = sensor & 0xff;
281 return i8k_smm(®s) ? : regs.eax & 0xff;
285 * Read the cpu temperature.
287 static int _i8k_get_temp(int sensor)
289 struct smm_regs regs = {
290 .eax = I8K_SMM_GET_TEMP,
291 .ebx = sensor & 0xff,
294 return i8k_smm(®s) ? : regs.eax & 0xff;
297 static int i8k_get_temp(int sensor)
299 int temp = _i8k_get_temp(sensor);
302 * Sometimes the temperature sensor returns 0x99, which is out of range.
303 * In this case we retry (once) before returning an error.
304 # 1003655137 00000058 00005a4b
305 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
306 # 1003655139 00000054 00005c52
310 temp = _i8k_get_temp(sensor);
313 * Return -ENODATA for all invalid temperatures.
315 * Known instances are the 0x99 value as seen above as well as
316 * 0xc1 (193), which may be returned when trying to read the GPU
317 * temperature if the system supports a GPU and it is currently
320 if (temp > I8K_MAX_TEMP)
326 static int i8k_get_dell_signature(int req_fn)
328 struct smm_regs regs = { .eax = req_fn, };
335 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
338 #if IS_ENABLED(CONFIG_I8K)
341 * Read the Fn key status.
343 static int i8k_get_fn_status(void)
345 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
352 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
365 * Read the power status.
367 static int i8k_get_power_status(void)
369 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
376 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
384 i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
388 unsigned char buff[16];
389 int __user *argp = (int __user *)arg;
395 case I8K_BIOS_VERSION:
396 if (!isdigit(bios_version[0]) || !isdigit(bios_version[1]) ||
397 !isdigit(bios_version[2]))
400 val = (bios_version[0] << 16) |
401 (bios_version[1] << 8) | bios_version[2];
405 if (restricted && !capable(CAP_SYS_ADMIN))
408 memset(buff, 0, sizeof(buff));
409 strlcpy(buff, bios_machineid, sizeof(buff));
413 val = i8k_get_fn_status();
416 case I8K_POWER_STATUS:
417 val = i8k_get_power_status();
421 val = i8k_get_temp(0);
425 if (copy_from_user(&val, argp, sizeof(int)))
428 val = i8k_get_fan_speed(val);
432 if (copy_from_user(&val, argp, sizeof(int)))
435 val = i8k_get_fan_status(val);
439 if (restricted && !capable(CAP_SYS_ADMIN))
442 if (copy_from_user(&val, argp, sizeof(int)))
445 if (copy_from_user(&speed, argp + 1, sizeof(int)))
448 val = i8k_set_fan(val, speed);
459 case I8K_BIOS_VERSION:
460 if (copy_to_user(argp, &val, 4))
465 if (copy_to_user(argp, buff, 16))
470 if (copy_to_user(argp, &val, sizeof(int)))
479 static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
483 mutex_lock(&i8k_mutex);
484 ret = i8k_ioctl_unlocked(fp, cmd, arg);
485 mutex_unlock(&i8k_mutex);
491 * Print the information for /proc/i8k.
493 static int i8k_proc_show(struct seq_file *seq, void *offset)
495 int fn_key, cpu_temp, ac_power;
496 int left_fan, right_fan, left_speed, right_speed;
498 cpu_temp = i8k_get_temp(0); /* 11100 µs */
499 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */
500 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */
501 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */
502 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */
503 fn_key = i8k_get_fn_status(); /* 750 µs */
505 ac_power = i8k_get_power_status(); /* 14700 µs */
512 * 1) Format version (this will change if format changes)
517 * 6) Right fan status
523 seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
526 (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : bios_machineid,
528 left_fan, right_fan, left_speed, right_speed,
534 static int i8k_open_fs(struct inode *inode, struct file *file)
536 return single_open(file, i8k_proc_show, NULL);
539 static const struct file_operations i8k_fops = {
540 .owner = THIS_MODULE,
544 .release = single_release,
545 .unlocked_ioctl = i8k_ioctl,
548 static void __init i8k_init_procfs(void)
550 /* Register the proc entry */
551 proc_create("i8k", 0, NULL, &i8k_fops);
554 static void __exit i8k_exit_procfs(void)
556 remove_proc_entry("i8k", NULL);
561 static inline void __init i8k_init_procfs(void)
565 static inline void __exit i8k_exit_procfs(void)
575 static ssize_t i8k_hwmon_show_temp_label(struct device *dev,
576 struct device_attribute *devattr,
579 static const char * const labels[] = {
587 int index = to_sensor_dev_attr(devattr)->index;
590 type = i8k_get_temp_type(index);
593 if (type >= ARRAY_SIZE(labels))
594 type = ARRAY_SIZE(labels) - 1;
595 return sprintf(buf, "%s\n", labels[type]);
598 static ssize_t i8k_hwmon_show_temp(struct device *dev,
599 struct device_attribute *devattr,
602 int index = to_sensor_dev_attr(devattr)->index;
605 temp = i8k_get_temp(index);
608 return sprintf(buf, "%d\n", temp * 1000);
611 static ssize_t i8k_hwmon_show_fan_label(struct device *dev,
612 struct device_attribute *devattr,
615 static const char * const labels[] = {
623 int index = to_sensor_dev_attr(devattr)->index;
627 type = i8k_get_fan_type(index);
636 if (type >= ARRAY_SIZE(labels))
637 type = (ARRAY_SIZE(labels) - 1);
639 return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]);
642 static ssize_t i8k_hwmon_show_fan(struct device *dev,
643 struct device_attribute *devattr,
646 int index = to_sensor_dev_attr(devattr)->index;
649 fan_speed = i8k_get_fan_speed(index);
652 return sprintf(buf, "%d\n", fan_speed);
655 static ssize_t i8k_hwmon_show_pwm(struct device *dev,
656 struct device_attribute *devattr,
659 int index = to_sensor_dev_attr(devattr)->index;
662 status = i8k_get_fan_status(index);
665 return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255));
668 static ssize_t i8k_hwmon_set_pwm(struct device *dev,
669 struct device_attribute *attr,
670 const char *buf, size_t count)
672 int index = to_sensor_dev_attr(attr)->index;
676 err = kstrtoul(buf, 10, &val);
679 val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max);
681 mutex_lock(&i8k_mutex);
682 err = i8k_set_fan(index, val);
683 mutex_unlock(&i8k_mutex);
685 return err < 0 ? -EIO : count;
688 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0);
689 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
691 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1);
692 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
694 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2);
695 static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
697 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3);
698 static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
700 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 0);
701 static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
703 static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
704 i8k_hwmon_set_pwm, 0);
705 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
707 static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
709 static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
710 i8k_hwmon_set_pwm, 1);
712 static struct attribute *i8k_attrs[] = {
713 &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */
714 &sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */
715 &sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */
716 &sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */
717 &sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */
718 &sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */
719 &sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */
720 &sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */
721 &sensor_dev_attr_fan1_input.dev_attr.attr, /* 8 */
722 &sensor_dev_attr_fan1_label.dev_attr.attr, /* 9 */
723 &sensor_dev_attr_pwm1.dev_attr.attr, /* 10 */
724 &sensor_dev_attr_fan2_input.dev_attr.attr, /* 11 */
725 &sensor_dev_attr_fan2_label.dev_attr.attr, /* 12 */
726 &sensor_dev_attr_pwm2.dev_attr.attr, /* 13 */
730 static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
733 if (disallow_fan_type_call &&
734 (index == 9 || index == 12))
736 if (index >= 0 && index <= 1 &&
737 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
739 if (index >= 2 && index <= 3 &&
740 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
742 if (index >= 4 && index <= 5 &&
743 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
745 if (index >= 6 && index <= 7 &&
746 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
748 if (index >= 8 && index <= 10 &&
749 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
751 if (index >= 11 && index <= 13 &&
752 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
758 static const struct attribute_group i8k_group = {
760 .is_visible = i8k_is_visible,
762 __ATTRIBUTE_GROUPS(i8k);
764 static int __init i8k_init_hwmon(void)
770 /* CPU temperature attributes, if temperature type is OK */
771 err = i8k_get_temp_type(0);
773 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1;
774 /* check for additional temperature sensors */
775 err = i8k_get_temp_type(1);
777 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2;
778 err = i8k_get_temp_type(2);
780 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3;
781 err = i8k_get_temp_type(3);
783 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
785 /* First fan attributes, if fan type is OK */
786 err = i8k_get_fan_type(0);
788 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
790 /* Second fan attributes, if fan type is OK */
791 err = i8k_get_fan_type(1);
793 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
795 i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm",
797 if (IS_ERR(i8k_hwmon_dev)) {
798 err = PTR_ERR(i8k_hwmon_dev);
799 i8k_hwmon_dev = NULL;
800 pr_err("hwmon registration failed (%d)\n", err);
806 struct i8k_config_data {
818 static const struct i8k_config_data i8k_config_data[] = {
819 [DELL_LATITUDE_D520] = {
821 .fan_max = I8K_FAN_TURBO,
823 [DELL_PRECISION_490] = {
825 .fan_max = I8K_FAN_TURBO,
829 .fan_max = I8K_FAN_HIGH,
833 .fan_max = I8K_FAN_HIGH,
837 static struct dmi_system_id i8k_dmi_table[] __initdata = {
839 .ident = "Dell Inspiron",
841 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
842 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
846 .ident = "Dell Latitude",
848 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
849 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
853 .ident = "Dell Inspiron 2",
855 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
856 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
860 .ident = "Dell Latitude D520",
862 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
863 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"),
865 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520],
868 .ident = "Dell Latitude 2",
870 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
871 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
874 { /* UK Inspiron 6400 */
875 .ident = "Dell Inspiron 3",
877 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
878 DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
882 .ident = "Dell Inspiron 3",
884 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
885 DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
889 .ident = "Dell Precision 490",
891 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
892 DMI_MATCH(DMI_PRODUCT_NAME,
893 "Precision WorkStation 490"),
895 .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490],
898 .ident = "Dell Precision",
900 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
901 DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
905 .ident = "Dell Vostro",
907 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
908 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
912 .ident = "Dell XPS421",
914 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
915 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
919 .ident = "Dell Studio",
921 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
922 DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
924 .driver_data = (void *)&i8k_config_data[DELL_STUDIO],
927 .ident = "Dell XPS 13",
929 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
930 DMI_MATCH(DMI_PRODUCT_NAME, "XPS13"),
932 .driver_data = (void *)&i8k_config_data[DELL_XPS],
935 .ident = "Dell XPS M140",
937 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
938 DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
940 .driver_data = (void *)&i8k_config_data[DELL_XPS],
945 MODULE_DEVICE_TABLE(dmi, i8k_dmi_table);
948 * On some machines once I8K_SMM_GET_FAN_TYPE is issued then CPU fan speed
949 * randomly going up and down due to bug in Dell SMM or BIOS. Here is blacklist
950 * of affected Dell machines for which we disallow I8K_SMM_GET_FAN_TYPE call.
951 * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121
953 static struct dmi_system_id i8k_blacklist_fan_type_dmi_table[] __initdata = {
955 .ident = "Dell Studio XPS 8000",
957 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
958 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000"),
962 .ident = "Dell Studio XPS 8100",
964 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
965 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"),
969 .ident = "Dell Inspiron 580",
971 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
972 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 580 "),
979 * Probe for the presence of a supported laptop.
981 static int __init i8k_probe(void)
983 const struct dmi_system_id *id;
987 * Get DMI information
989 if (!dmi_check_system(i8k_dmi_table)) {
990 if (!ignore_dmi && !force)
993 pr_info("not running on a supported Dell system.\n");
994 pr_info("vendor=%s, model=%s, version=%s\n",
995 i8k_get_dmi_data(DMI_SYS_VENDOR),
996 i8k_get_dmi_data(DMI_PRODUCT_NAME),
997 i8k_get_dmi_data(DMI_BIOS_VERSION));
1000 if (dmi_check_system(i8k_blacklist_fan_type_dmi_table))
1001 disallow_fan_type_call = true;
1003 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
1004 sizeof(bios_version));
1005 strlcpy(bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
1006 sizeof(bios_machineid));
1009 * Get SMM Dell signature
1011 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
1012 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
1013 pr_err("unable to get SMM Dell signature\n");
1019 * Set fan multiplier and maximal fan speed from dmi config
1020 * Values specified in module parameters override values from dmi
1022 id = dmi_first_match(i8k_dmi_table);
1023 if (id && id->driver_data) {
1024 const struct i8k_config_data *conf = id->driver_data;
1025 if (!fan_mult && conf->fan_mult)
1026 fan_mult = conf->fan_mult;
1027 if (!fan_max && conf->fan_max)
1028 fan_max = conf->fan_max;
1031 i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */
1032 i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);
1036 * Autodetect fan multiplier based on nominal rpm
1037 * If fan reports rpm value too high then set multiplier to 1
1039 for (fan = 0; fan < 2; ++fan) {
1040 ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max);
1043 if (ret > I8K_FAN_MAX_RPM)
1048 /* Fan multiplier was specified in module param or in dmi */
1049 i8k_fan_mult = fan_mult;
1055 static int __init i8k_init(void)
1059 /* Are we running on an supported laptop? */
1063 err = i8k_init_hwmon();
1071 static void __exit i8k_exit(void)
1073 hwmon_device_unregister(i8k_hwmon_dev);
1077 module_init(i8k_init);
1078 module_exit(i8k_exit);