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 char bios_machineid[16];
70 static struct device *i8k_hwmon_dev;
71 static u32 i8k_hwmon_flags;
72 static uint i8k_fan_mult = I8K_FAN_MULT;
73 static uint i8k_pwm_mult;
74 static uint i8k_fan_max = I8K_FAN_HIGH;
76 #define I8K_HWMON_HAVE_TEMP1 (1 << 0)
77 #define I8K_HWMON_HAVE_TEMP2 (1 << 1)
78 #define I8K_HWMON_HAVE_TEMP3 (1 << 2)
79 #define I8K_HWMON_HAVE_TEMP4 (1 << 3)
80 #define I8K_HWMON_HAVE_FAN1 (1 << 4)
81 #define I8K_HWMON_HAVE_FAN2 (1 << 5)
83 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
84 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
85 MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver");
86 MODULE_LICENSE("GPL");
90 module_param(force, bool, 0);
91 MODULE_PARM_DESC(force, "Force loading without checking for supported models");
93 static bool ignore_dmi;
94 module_param(ignore_dmi, bool, 0);
95 MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
97 #if IS_ENABLED(CONFIG_I8K)
98 static bool restricted = true;
99 module_param(restricted, bool, 0);
100 MODULE_PARM_DESC(restricted, "Restrict fan control and serial number to CAP_SYS_ADMIN (default: 1)");
102 static bool power_status;
103 module_param(power_status, bool, 0600);
104 MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k (default: 0)");
107 static uint fan_mult;
108 module_param(fan_mult, uint, 0);
109 MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)");
112 module_param(fan_max, uint, 0);
113 MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)");
117 unsigned int ebx __packed;
118 unsigned int ecx __packed;
119 unsigned int edx __packed;
120 unsigned int esi __packed;
121 unsigned int edi __packed;
124 static inline const char *i8k_get_dmi_data(int field)
126 const char *dmi_data = dmi_get_system_info(field);
128 return dmi_data && *dmi_data ? dmi_data : "?";
132 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
134 static int i8k_smm(struct smm_regs *regs)
138 cpumask_var_t old_mask;
140 /* SMM requires CPU 0 */
141 if (!alloc_cpumask_var(&old_mask, GFP_KERNEL))
143 cpumask_copy(old_mask, ¤t->cpus_allowed);
144 rc = set_cpus_allowed_ptr(current, cpumask_of(0));
147 if (smp_processor_id() != 0) {
152 #if defined(CONFIG_X86_64)
153 asm volatile("pushq %%rax\n\t"
154 "movl 0(%%rax),%%edx\n\t"
156 "movl 4(%%rax),%%ebx\n\t"
157 "movl 8(%%rax),%%ecx\n\t"
158 "movl 12(%%rax),%%edx\n\t"
159 "movl 16(%%rax),%%esi\n\t"
160 "movl 20(%%rax),%%edi\n\t"
164 "xchgq %%rax,(%%rsp)\n\t"
165 "movl %%ebx,4(%%rax)\n\t"
166 "movl %%ecx,8(%%rax)\n\t"
167 "movl %%edx,12(%%rax)\n\t"
168 "movl %%esi,16(%%rax)\n\t"
169 "movl %%edi,20(%%rax)\n\t"
171 "movl %%edx,0(%%rax)\n\t"
177 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
179 asm volatile("pushl %%eax\n\t"
180 "movl 0(%%eax),%%edx\n\t"
182 "movl 4(%%eax),%%ebx\n\t"
183 "movl 8(%%eax),%%ecx\n\t"
184 "movl 12(%%eax),%%edx\n\t"
185 "movl 16(%%eax),%%esi\n\t"
186 "movl 20(%%eax),%%edi\n\t"
190 "xchgl %%eax,(%%esp)\n\t"
191 "movl %%ebx,4(%%eax)\n\t"
192 "movl %%ecx,8(%%eax)\n\t"
193 "movl %%edx,12(%%eax)\n\t"
194 "movl %%esi,16(%%eax)\n\t"
195 "movl %%edi,20(%%eax)\n\t"
197 "movl %%edx,0(%%eax)\n\t"
203 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
205 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
209 set_cpus_allowed_ptr(current, old_mask);
210 free_cpumask_var(old_mask);
215 * Read the fan status.
217 static int i8k_get_fan_status(int fan)
219 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
221 regs.ebx = fan & 0xff;
222 return i8k_smm(®s) ? : regs.eax & 0xff;
226 * Read the fan speed in RPM.
228 static int i8k_get_fan_speed(int fan)
230 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
232 regs.ebx = fan & 0xff;
233 return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult;
239 static int i8k_get_fan_type(int fan)
241 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, };
243 regs.ebx = fan & 0xff;
244 return i8k_smm(®s) ? : regs.eax & 0xff;
248 * Read the fan nominal rpm for specific fan speed.
250 static int i8k_get_fan_nominal_speed(int fan, int speed)
252 struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, };
254 regs.ebx = (fan & 0xff) | (speed << 8);
255 return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult;
259 * Set the fan speed (off, low, high). Returns the new fan status.
261 static int i8k_set_fan(int fan, int speed)
263 struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
265 speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed);
266 regs.ebx = (fan & 0xff) | (speed << 8);
268 return i8k_smm(®s) ? : i8k_get_fan_status(fan);
271 static int i8k_get_temp_type(int sensor)
273 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, };
275 regs.ebx = sensor & 0xff;
276 return i8k_smm(®s) ? : regs.eax & 0xff;
280 * Read the cpu temperature.
282 static int _i8k_get_temp(int sensor)
284 struct smm_regs regs = {
285 .eax = I8K_SMM_GET_TEMP,
286 .ebx = sensor & 0xff,
289 return i8k_smm(®s) ? : regs.eax & 0xff;
292 static int i8k_get_temp(int sensor)
294 int temp = _i8k_get_temp(sensor);
297 * Sometimes the temperature sensor returns 0x99, which is out of range.
298 * In this case we retry (once) before returning an error.
299 # 1003655137 00000058 00005a4b
300 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
301 # 1003655139 00000054 00005c52
305 temp = _i8k_get_temp(sensor);
308 * Return -ENODATA for all invalid temperatures.
310 * Known instances are the 0x99 value as seen above as well as
311 * 0xc1 (193), which may be returned when trying to read the GPU
312 * temperature if the system supports a GPU and it is currently
315 if (temp > I8K_MAX_TEMP)
321 static int i8k_get_dell_signature(int req_fn)
323 struct smm_regs regs = { .eax = req_fn, };
330 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
333 #if IS_ENABLED(CONFIG_I8K)
336 * Read the Fn key status.
338 static int i8k_get_fn_status(void)
340 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
347 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
360 * Read the power status.
362 static int i8k_get_power_status(void)
364 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
371 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
379 i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
383 unsigned char buff[16];
384 int __user *argp = (int __user *)arg;
390 case I8K_BIOS_VERSION:
391 val = (bios_version[0] << 16) |
392 (bios_version[1] << 8) | bios_version[2];
396 if (restricted && !capable(CAP_SYS_ADMIN))
399 memset(buff, 0, sizeof(buff));
400 strlcpy(buff, bios_machineid, sizeof(buff));
404 val = i8k_get_fn_status();
407 case I8K_POWER_STATUS:
408 val = i8k_get_power_status();
412 val = i8k_get_temp(0);
416 if (copy_from_user(&val, argp, sizeof(int)))
419 val = i8k_get_fan_speed(val);
423 if (copy_from_user(&val, argp, sizeof(int)))
426 val = i8k_get_fan_status(val);
430 if (restricted && !capable(CAP_SYS_ADMIN))
433 if (copy_from_user(&val, argp, sizeof(int)))
436 if (copy_from_user(&speed, argp + 1, sizeof(int)))
439 val = i8k_set_fan(val, speed);
450 case I8K_BIOS_VERSION:
451 if (copy_to_user(argp, &val, 4))
456 if (copy_to_user(argp, buff, 16))
461 if (copy_to_user(argp, &val, sizeof(int)))
470 static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
474 mutex_lock(&i8k_mutex);
475 ret = i8k_ioctl_unlocked(fp, cmd, arg);
476 mutex_unlock(&i8k_mutex);
482 * Print the information for /proc/i8k.
484 static int i8k_proc_show(struct seq_file *seq, void *offset)
486 int fn_key, cpu_temp, ac_power;
487 int left_fan, right_fan, left_speed, right_speed;
489 cpu_temp = i8k_get_temp(0); /* 11100 µs */
490 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */
491 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */
492 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */
493 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */
494 fn_key = i8k_get_fn_status(); /* 750 µs */
496 ac_power = i8k_get_power_status(); /* 14700 µs */
503 * 1) Format version (this will change if format changes)
508 * 6) Right fan status
514 seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
517 (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : bios_machineid,
519 left_fan, right_fan, left_speed, right_speed,
525 static int i8k_open_fs(struct inode *inode, struct file *file)
527 return single_open(file, i8k_proc_show, NULL);
530 static const struct file_operations i8k_fops = {
531 .owner = THIS_MODULE,
535 .release = single_release,
536 .unlocked_ioctl = i8k_ioctl,
539 static void __init i8k_init_procfs(void)
541 /* Register the proc entry */
542 proc_create("i8k", 0, NULL, &i8k_fops);
545 static void __exit i8k_exit_procfs(void)
547 remove_proc_entry("i8k", NULL);
552 static inline void __init i8k_init_procfs(void)
556 static inline void __exit i8k_exit_procfs(void)
566 static ssize_t i8k_hwmon_show_temp_label(struct device *dev,
567 struct device_attribute *devattr,
570 static const char * const labels[] = {
578 int index = to_sensor_dev_attr(devattr)->index;
581 type = i8k_get_temp_type(index);
584 if (type >= ARRAY_SIZE(labels))
585 type = ARRAY_SIZE(labels) - 1;
586 return sprintf(buf, "%s\n", labels[type]);
589 static ssize_t i8k_hwmon_show_temp(struct device *dev,
590 struct device_attribute *devattr,
593 int index = to_sensor_dev_attr(devattr)->index;
596 temp = i8k_get_temp(index);
599 return sprintf(buf, "%d\n", temp * 1000);
602 static ssize_t i8k_hwmon_show_fan_label(struct device *dev,
603 struct device_attribute *devattr,
606 static const char * const labels[] = {
614 int index = to_sensor_dev_attr(devattr)->index;
618 type = i8k_get_fan_type(index);
627 if (type >= ARRAY_SIZE(labels))
628 type = (ARRAY_SIZE(labels) - 1);
630 return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]);
633 static ssize_t i8k_hwmon_show_fan(struct device *dev,
634 struct device_attribute *devattr,
637 int index = to_sensor_dev_attr(devattr)->index;
640 fan_speed = i8k_get_fan_speed(index);
643 return sprintf(buf, "%d\n", fan_speed);
646 static ssize_t i8k_hwmon_show_pwm(struct device *dev,
647 struct device_attribute *devattr,
650 int index = to_sensor_dev_attr(devattr)->index;
653 status = i8k_get_fan_status(index);
656 return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255));
659 static ssize_t i8k_hwmon_set_pwm(struct device *dev,
660 struct device_attribute *attr,
661 const char *buf, size_t count)
663 int index = to_sensor_dev_attr(attr)->index;
667 err = kstrtoul(buf, 10, &val);
670 val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max);
672 mutex_lock(&i8k_mutex);
673 err = i8k_set_fan(index, val);
674 mutex_unlock(&i8k_mutex);
676 return err < 0 ? -EIO : count;
679 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0);
680 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
682 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1);
683 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
685 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2);
686 static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
688 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3);
689 static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
691 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 0);
692 static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
694 static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
695 i8k_hwmon_set_pwm, 0);
696 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
698 static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
700 static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
701 i8k_hwmon_set_pwm, 1);
703 static struct attribute *i8k_attrs[] = {
704 &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */
705 &sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */
706 &sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */
707 &sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */
708 &sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */
709 &sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */
710 &sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */
711 &sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */
712 &sensor_dev_attr_fan1_input.dev_attr.attr, /* 8 */
713 &sensor_dev_attr_fan1_label.dev_attr.attr, /* 9 */
714 &sensor_dev_attr_pwm1.dev_attr.attr, /* 10 */
715 &sensor_dev_attr_fan2_input.dev_attr.attr, /* 11 */
716 &sensor_dev_attr_fan2_label.dev_attr.attr, /* 12 */
717 &sensor_dev_attr_pwm2.dev_attr.attr, /* 13 */
721 static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
724 if (index >= 0 && index <= 1 &&
725 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
727 if (index >= 2 && index <= 3 &&
728 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
730 if (index >= 4 && index <= 5 &&
731 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
733 if (index >= 6 && index <= 7 &&
734 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
736 if (index >= 8 && index <= 10 &&
737 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
739 if (index >= 11 && index <= 13 &&
740 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
746 static const struct attribute_group i8k_group = {
748 .is_visible = i8k_is_visible,
750 __ATTRIBUTE_GROUPS(i8k);
752 static int __init i8k_init_hwmon(void)
758 /* CPU temperature attributes, if temperature type is OK */
759 err = i8k_get_temp_type(0);
761 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1;
762 /* check for additional temperature sensors */
763 err = i8k_get_temp_type(1);
765 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2;
766 err = i8k_get_temp_type(2);
768 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3;
769 err = i8k_get_temp_type(3);
771 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
773 /* First fan attributes, if fan type is OK */
774 err = i8k_get_fan_type(0);
776 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
778 /* Second fan attributes, if fan type is OK */
779 err = i8k_get_fan_type(1);
781 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
783 i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm",
785 if (IS_ERR(i8k_hwmon_dev)) {
786 err = PTR_ERR(i8k_hwmon_dev);
787 i8k_hwmon_dev = NULL;
788 pr_err("hwmon registration failed (%d)\n", err);
794 struct i8k_config_data {
806 static const struct i8k_config_data i8k_config_data[] = {
807 [DELL_LATITUDE_D520] = {
809 .fan_max = I8K_FAN_TURBO,
811 [DELL_PRECISION_490] = {
813 .fan_max = I8K_FAN_TURBO,
817 .fan_max = I8K_FAN_HIGH,
821 .fan_max = I8K_FAN_HIGH,
825 static struct dmi_system_id i8k_dmi_table[] __initdata = {
827 .ident = "Dell Inspiron",
829 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
830 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
834 .ident = "Dell Latitude",
836 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
837 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
841 .ident = "Dell Inspiron 2",
843 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
844 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
848 .ident = "Dell Latitude D520",
850 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
851 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"),
853 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520],
856 .ident = "Dell Latitude 2",
858 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
859 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
862 { /* UK Inspiron 6400 */
863 .ident = "Dell Inspiron 3",
865 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
866 DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
870 .ident = "Dell Inspiron 3",
872 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
873 DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
877 .ident = "Dell Precision 490",
879 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
880 DMI_MATCH(DMI_PRODUCT_NAME,
881 "Precision WorkStation 490"),
883 .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490],
886 .ident = "Dell Precision",
888 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
889 DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
893 .ident = "Dell Vostro",
895 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
896 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
900 .ident = "Dell XPS421",
902 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
903 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
907 .ident = "Dell Studio",
909 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
910 DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
912 .driver_data = (void *)&i8k_config_data[DELL_STUDIO],
915 .ident = "Dell XPS 13",
917 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
918 DMI_MATCH(DMI_PRODUCT_NAME, "XPS13"),
920 .driver_data = (void *)&i8k_config_data[DELL_XPS],
923 .ident = "Dell XPS M140",
925 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
926 DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
928 .driver_data = (void *)&i8k_config_data[DELL_XPS],
933 MODULE_DEVICE_TABLE(dmi, i8k_dmi_table);
935 static struct dmi_system_id i8k_blacklist_dmi_table[] __initdata = {
938 * CPU fan speed going up and down on Dell Studio XPS 8000
939 * for unknown reasons.
941 .ident = "Dell Studio XPS 8000",
943 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
944 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000"),
949 * CPU fan speed going up and down on Dell Studio XPS 8100
950 * for unknown reasons.
952 .ident = "Dell Studio XPS 8100",
954 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
955 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"),
962 * Probe for the presence of a supported laptop.
964 static int __init i8k_probe(void)
966 const struct dmi_system_id *id;
970 * Get DMI information
972 if (!dmi_check_system(i8k_dmi_table) ||
973 dmi_check_system(i8k_blacklist_dmi_table)) {
974 if (!ignore_dmi && !force)
977 pr_info("not running on a supported Dell system.\n");
978 pr_info("vendor=%s, model=%s, version=%s\n",
979 i8k_get_dmi_data(DMI_SYS_VENDOR),
980 i8k_get_dmi_data(DMI_PRODUCT_NAME),
981 i8k_get_dmi_data(DMI_BIOS_VERSION));
984 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
985 sizeof(bios_version));
986 strlcpy(bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
987 sizeof(bios_machineid));
990 * Get SMM Dell signature
992 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
993 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
994 pr_err("unable to get SMM Dell signature\n");
1000 * Set fan multiplier and maximal fan speed from dmi config
1001 * Values specified in module parameters override values from dmi
1003 id = dmi_first_match(i8k_dmi_table);
1004 if (id && id->driver_data) {
1005 const struct i8k_config_data *conf = id->driver_data;
1006 if (!fan_mult && conf->fan_mult)
1007 fan_mult = conf->fan_mult;
1008 if (!fan_max && conf->fan_max)
1009 fan_max = conf->fan_max;
1012 i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */
1013 i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);
1017 * Autodetect fan multiplier based on nominal rpm
1018 * If fan reports rpm value too high then set multiplier to 1
1020 for (fan = 0; fan < 2; ++fan) {
1021 ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max);
1024 if (ret > I8K_FAN_MAX_RPM)
1029 /* Fan multiplier was specified in module param or in dmi */
1030 i8k_fan_mult = fan_mult;
1036 static int __init i8k_init(void)
1040 /* Are we running on an supported laptop? */
1044 err = i8k_init_hwmon();
1052 static void __exit i8k_exit(void)
1054 hwmon_device_unregister(i8k_hwmon_dev);
1058 module_init(i8k_init);
1059 module_exit(i8k_exit);