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/cpu.h>
25 #include <linux/delay.h>
26 #include <linux/module.h>
27 #include <linux/types.h>
28 #include <linux/init.h>
29 #include <linux/proc_fs.h>
30 #include <linux/seq_file.h>
31 #include <linux/dmi.h>
32 #include <linux/capability.h>
33 #include <linux/mutex.h>
34 #include <linux/hwmon.h>
35 #include <linux/hwmon-sysfs.h>
36 #include <linux/uaccess.h>
38 #include <linux/sched.h>
39 #include <linux/ctype.h>
40 #include <linux/smp.h>
42 #include <linux/i8k.h>
44 #define I8K_SMM_FN_STATUS 0x0025
45 #define I8K_SMM_POWER_STATUS 0x0069
46 #define I8K_SMM_SET_FAN 0x01a3
47 #define I8K_SMM_GET_FAN 0x00a3
48 #define I8K_SMM_GET_SPEED 0x02a3
49 #define I8K_SMM_GET_FAN_TYPE 0x03a3
50 #define I8K_SMM_GET_NOM_SPEED 0x04a3
51 #define I8K_SMM_GET_TEMP 0x10a3
52 #define I8K_SMM_GET_TEMP_TYPE 0x11a3
53 #define I8K_SMM_GET_DELL_SIG1 0xfea3
54 #define I8K_SMM_GET_DELL_SIG2 0xffa3
56 #define I8K_FAN_MULT 30
57 #define I8K_FAN_MAX_RPM 30000
58 #define I8K_MAX_TEMP 127
60 #define I8K_FN_NONE 0x00
61 #define I8K_FN_UP 0x01
62 #define I8K_FN_DOWN 0x02
63 #define I8K_FN_MUTE 0x04
64 #define I8K_FN_MASK 0x07
65 #define I8K_FN_SHIFT 8
67 #define I8K_POWER_AC 0x05
68 #define I8K_POWER_BATTERY 0x01
70 static DEFINE_MUTEX(i8k_mutex);
71 static char bios_version[4];
72 static char bios_machineid[16];
73 static struct device *i8k_hwmon_dev;
74 static u32 i8k_hwmon_flags;
75 static uint i8k_fan_mult = I8K_FAN_MULT;
76 static uint i8k_pwm_mult;
77 static uint i8k_fan_max = I8K_FAN_HIGH;
78 static bool disallow_fan_type_call;
79 static bool disallow_fan_support;
81 #define I8K_HWMON_HAVE_TEMP1 (1 << 0)
82 #define I8K_HWMON_HAVE_TEMP2 (1 << 1)
83 #define I8K_HWMON_HAVE_TEMP3 (1 << 2)
84 #define I8K_HWMON_HAVE_TEMP4 (1 << 3)
85 #define I8K_HWMON_HAVE_FAN1 (1 << 4)
86 #define I8K_HWMON_HAVE_FAN2 (1 << 5)
87 #define I8K_HWMON_HAVE_FAN3 (1 << 6)
89 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
90 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
91 MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver");
92 MODULE_LICENSE("GPL");
96 module_param(force, bool, 0);
97 MODULE_PARM_DESC(force, "Force loading without checking for supported models");
99 static bool ignore_dmi;
100 module_param(ignore_dmi, bool, 0);
101 MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
103 #if IS_ENABLED(CONFIG_I8K)
104 static bool restricted = true;
105 module_param(restricted, bool, 0);
106 MODULE_PARM_DESC(restricted, "Restrict fan control and serial number to CAP_SYS_ADMIN (default: 1)");
108 static bool power_status;
109 module_param(power_status, bool, 0600);
110 MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k (default: 0)");
113 static uint fan_mult;
114 module_param(fan_mult, uint, 0);
115 MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)");
118 module_param(fan_max, uint, 0);
119 MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)");
123 unsigned int ebx __packed;
124 unsigned int ecx __packed;
125 unsigned int edx __packed;
126 unsigned int esi __packed;
127 unsigned int edi __packed;
130 static inline const char *i8k_get_dmi_data(int field)
132 const char *dmi_data = dmi_get_system_info(field);
134 return dmi_data && *dmi_data ? dmi_data : "?";
138 * Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
140 static int i8k_smm_func(void *par)
143 struct smm_regs *regs = par;
148 unsigned long duration;
149 ktime_t calltime, delta, rettime;
151 calltime = ktime_get();
154 /* SMM requires CPU 0 */
155 if (smp_processor_id() != 0)
158 #if defined(CONFIG_X86_64)
159 asm volatile("pushq %%rax\n\t"
160 "movl 0(%%rax),%%edx\n\t"
162 "movl 4(%%rax),%%ebx\n\t"
163 "movl 8(%%rax),%%ecx\n\t"
164 "movl 12(%%rax),%%edx\n\t"
165 "movl 16(%%rax),%%esi\n\t"
166 "movl 20(%%rax),%%edi\n\t"
170 "xchgq %%rax,(%%rsp)\n\t"
171 "movl %%ebx,4(%%rax)\n\t"
172 "movl %%ecx,8(%%rax)\n\t"
173 "movl %%edx,12(%%rax)\n\t"
174 "movl %%esi,16(%%rax)\n\t"
175 "movl %%edi,20(%%rax)\n\t"
177 "movl %%edx,0(%%rax)\n\t"
183 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
185 asm volatile("pushl %%eax\n\t"
186 "movl 0(%%eax),%%edx\n\t"
188 "movl 4(%%eax),%%ebx\n\t"
189 "movl 8(%%eax),%%ecx\n\t"
190 "movl 12(%%eax),%%edx\n\t"
191 "movl 16(%%eax),%%esi\n\t"
192 "movl 20(%%eax),%%edi\n\t"
196 "xchgl %%eax,(%%esp)\n\t"
197 "movl %%ebx,4(%%eax)\n\t"
198 "movl %%ecx,8(%%eax)\n\t"
199 "movl %%edx,12(%%eax)\n\t"
200 "movl %%esi,16(%%eax)\n\t"
201 "movl %%edi,20(%%eax)\n\t"
203 "movl %%edx,0(%%eax)\n\t"
209 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
211 if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
215 rettime = ktime_get();
216 delta = ktime_sub(rettime, calltime);
217 duration = ktime_to_ns(delta) >> 10;
218 pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lu usecs)\n", eax, ebx,
219 (rc ? 0xffff : regs->eax & 0xffff), duration);
226 * Call the System Management Mode BIOS.
228 static int i8k_smm(struct smm_regs *regs)
233 ret = smp_call_on_cpu(0, i8k_smm_func, regs, true);
240 * Read the fan status.
242 static int i8k_get_fan_status(int fan)
244 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
246 if (disallow_fan_support)
249 regs.ebx = fan & 0xff;
250 return i8k_smm(®s) ? : regs.eax & 0xff;
254 * Read the fan speed in RPM.
256 static int i8k_get_fan_speed(int fan)
258 struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
260 if (disallow_fan_support)
263 regs.ebx = fan & 0xff;
264 return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult;
270 static int _i8k_get_fan_type(int fan)
272 struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, };
274 if (disallow_fan_support || disallow_fan_type_call)
277 regs.ebx = fan & 0xff;
278 return i8k_smm(®s) ? : regs.eax & 0xff;
281 static int i8k_get_fan_type(int fan)
283 /* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */
284 static int types[3] = { INT_MIN, INT_MIN, INT_MIN };
286 if (types[fan] == INT_MIN)
287 types[fan] = _i8k_get_fan_type(fan);
293 * Read the fan nominal rpm for specific fan speed.
295 static int i8k_get_fan_nominal_speed(int fan, int speed)
297 struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, };
299 if (disallow_fan_support)
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 if (disallow_fan_support)
316 speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed);
317 regs.ebx = (fan & 0xff) | (speed << 8);
319 return i8k_smm(®s) ? : i8k_get_fan_status(fan);
322 static int i8k_get_temp_type(int sensor)
324 struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, };
326 regs.ebx = sensor & 0xff;
327 return i8k_smm(®s) ? : regs.eax & 0xff;
331 * Read the cpu temperature.
333 static int _i8k_get_temp(int sensor)
335 struct smm_regs regs = {
336 .eax = I8K_SMM_GET_TEMP,
337 .ebx = sensor & 0xff,
340 return i8k_smm(®s) ? : regs.eax & 0xff;
343 static int i8k_get_temp(int sensor)
345 int temp = _i8k_get_temp(sensor);
348 * Sometimes the temperature sensor returns 0x99, which is out of range.
349 * In this case we retry (once) before returning an error.
350 # 1003655137 00000058 00005a4b
351 # 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
352 # 1003655139 00000054 00005c52
356 temp = _i8k_get_temp(sensor);
359 * Return -ENODATA for all invalid temperatures.
361 * Known instances are the 0x99 value as seen above as well as
362 * 0xc1 (193), which may be returned when trying to read the GPU
363 * temperature if the system supports a GPU and it is currently
366 if (temp > I8K_MAX_TEMP)
372 static int i8k_get_dell_signature(int req_fn)
374 struct smm_regs regs = { .eax = req_fn, };
381 return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
384 #if IS_ENABLED(CONFIG_I8K)
387 * Read the Fn key status.
389 static int i8k_get_fn_status(void)
391 struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
398 switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
411 * Read the power status.
413 static int i8k_get_power_status(void)
415 struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
422 return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
430 i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
434 unsigned char buff[16];
435 int __user *argp = (int __user *)arg;
441 case I8K_BIOS_VERSION:
442 if (!isdigit(bios_version[0]) || !isdigit(bios_version[1]) ||
443 !isdigit(bios_version[2]))
446 val = (bios_version[0] << 16) |
447 (bios_version[1] << 8) | bios_version[2];
451 if (restricted && !capable(CAP_SYS_ADMIN))
454 memset(buff, 0, sizeof(buff));
455 strlcpy(buff, bios_machineid, sizeof(buff));
459 val = i8k_get_fn_status();
462 case I8K_POWER_STATUS:
463 val = i8k_get_power_status();
467 val = i8k_get_temp(0);
471 if (copy_from_user(&val, argp, sizeof(int)))
474 val = i8k_get_fan_speed(val);
478 if (copy_from_user(&val, argp, sizeof(int)))
481 val = i8k_get_fan_status(val);
485 if (restricted && !capable(CAP_SYS_ADMIN))
488 if (copy_from_user(&val, argp, sizeof(int)))
491 if (copy_from_user(&speed, argp + 1, sizeof(int)))
494 val = i8k_set_fan(val, speed);
505 case I8K_BIOS_VERSION:
506 if (copy_to_user(argp, &val, 4))
511 if (copy_to_user(argp, buff, 16))
516 if (copy_to_user(argp, &val, sizeof(int)))
525 static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
529 mutex_lock(&i8k_mutex);
530 ret = i8k_ioctl_unlocked(fp, cmd, arg);
531 mutex_unlock(&i8k_mutex);
537 * Print the information for /proc/i8k.
539 static int i8k_proc_show(struct seq_file *seq, void *offset)
541 int fn_key, cpu_temp, ac_power;
542 int left_fan, right_fan, left_speed, right_speed;
544 cpu_temp = i8k_get_temp(0); /* 11100 µs */
545 left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */
546 right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */
547 left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */
548 right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */
549 fn_key = i8k_get_fn_status(); /* 750 µs */
551 ac_power = i8k_get_power_status(); /* 14700 µs */
558 * 1) Format version (this will change if format changes)
563 * 6) Right fan status
569 seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
572 (restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : bios_machineid,
574 left_fan, right_fan, left_speed, right_speed,
580 static int i8k_open_fs(struct inode *inode, struct file *file)
582 return single_open(file, i8k_proc_show, NULL);
585 static const struct file_operations i8k_fops = {
586 .owner = THIS_MODULE,
590 .release = single_release,
591 .unlocked_ioctl = i8k_ioctl,
594 static void __init i8k_init_procfs(void)
596 /* Register the proc entry */
597 proc_create("i8k", 0, NULL, &i8k_fops);
600 static void __exit i8k_exit_procfs(void)
602 remove_proc_entry("i8k", NULL);
607 static inline void __init i8k_init_procfs(void)
611 static inline void __exit i8k_exit_procfs(void)
621 static ssize_t i8k_hwmon_show_temp_label(struct device *dev,
622 struct device_attribute *devattr,
625 static const char * const labels[] = {
633 int index = to_sensor_dev_attr(devattr)->index;
636 type = i8k_get_temp_type(index);
639 if (type >= ARRAY_SIZE(labels))
640 type = ARRAY_SIZE(labels) - 1;
641 return sprintf(buf, "%s\n", labels[type]);
644 static ssize_t i8k_hwmon_show_temp(struct device *dev,
645 struct device_attribute *devattr,
648 int index = to_sensor_dev_attr(devattr)->index;
651 temp = i8k_get_temp(index);
654 return sprintf(buf, "%d\n", temp * 1000);
657 static ssize_t i8k_hwmon_show_fan_label(struct device *dev,
658 struct device_attribute *devattr,
661 static const char * const labels[] = {
669 int index = to_sensor_dev_attr(devattr)->index;
673 type = i8k_get_fan_type(index);
682 if (type >= ARRAY_SIZE(labels))
683 type = (ARRAY_SIZE(labels) - 1);
685 return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]);
688 static ssize_t i8k_hwmon_show_fan(struct device *dev,
689 struct device_attribute *devattr,
692 int index = to_sensor_dev_attr(devattr)->index;
695 fan_speed = i8k_get_fan_speed(index);
698 return sprintf(buf, "%d\n", fan_speed);
701 static ssize_t i8k_hwmon_show_pwm(struct device *dev,
702 struct device_attribute *devattr,
705 int index = to_sensor_dev_attr(devattr)->index;
708 status = i8k_get_fan_status(index);
711 return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255));
714 static ssize_t i8k_hwmon_set_pwm(struct device *dev,
715 struct device_attribute *attr,
716 const char *buf, size_t count)
718 int index = to_sensor_dev_attr(attr)->index;
722 err = kstrtoul(buf, 10, &val);
725 val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max);
727 mutex_lock(&i8k_mutex);
728 err = i8k_set_fan(index, val);
729 mutex_unlock(&i8k_mutex);
731 return err < 0 ? -EIO : count;
734 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0);
735 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
737 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1);
738 static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
740 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2);
741 static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
743 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3);
744 static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
746 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 0);
747 static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
749 static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
750 i8k_hwmon_set_pwm, 0);
751 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
753 static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
755 static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
756 i8k_hwmon_set_pwm, 1);
757 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
759 static SENSOR_DEVICE_ATTR(fan3_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
761 static SENSOR_DEVICE_ATTR(pwm3, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
762 i8k_hwmon_set_pwm, 2);
764 static struct attribute *i8k_attrs[] = {
765 &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */
766 &sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */
767 &sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */
768 &sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */
769 &sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */
770 &sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */
771 &sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */
772 &sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */
773 &sensor_dev_attr_fan1_input.dev_attr.attr, /* 8 */
774 &sensor_dev_attr_fan1_label.dev_attr.attr, /* 9 */
775 &sensor_dev_attr_pwm1.dev_attr.attr, /* 10 */
776 &sensor_dev_attr_fan2_input.dev_attr.attr, /* 11 */
777 &sensor_dev_attr_fan2_label.dev_attr.attr, /* 12 */
778 &sensor_dev_attr_pwm2.dev_attr.attr, /* 13 */
779 &sensor_dev_attr_fan3_input.dev_attr.attr, /* 14 */
780 &sensor_dev_attr_fan3_label.dev_attr.attr, /* 15 */
781 &sensor_dev_attr_pwm3.dev_attr.attr, /* 16 */
785 static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
788 if (disallow_fan_support && index >= 8)
790 if (disallow_fan_type_call &&
791 (index == 9 || index == 12 || index == 15))
793 if (index >= 0 && index <= 1 &&
794 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
796 if (index >= 2 && index <= 3 &&
797 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
799 if (index >= 4 && index <= 5 &&
800 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
802 if (index >= 6 && index <= 7 &&
803 !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
805 if (index >= 8 && index <= 10 &&
806 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
808 if (index >= 11 && index <= 13 &&
809 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
811 if (index >= 14 && index <= 16 &&
812 !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN3))
818 static const struct attribute_group i8k_group = {
820 .is_visible = i8k_is_visible,
822 __ATTRIBUTE_GROUPS(i8k);
824 static int __init i8k_init_hwmon(void)
830 /* CPU temperature attributes, if temperature type is OK */
831 err = i8k_get_temp_type(0);
833 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1;
834 /* check for additional temperature sensors */
835 err = i8k_get_temp_type(1);
837 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2;
838 err = i8k_get_temp_type(2);
840 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3;
841 err = i8k_get_temp_type(3);
843 i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
845 /* First fan attributes, if fan status or type is OK */
846 err = i8k_get_fan_status(0);
848 err = i8k_get_fan_type(0);
850 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
852 /* Second fan attributes, if fan status or type is OK */
853 err = i8k_get_fan_status(1);
855 err = i8k_get_fan_type(1);
857 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
859 /* Third fan attributes, if fan status or type is OK */
860 err = i8k_get_fan_status(2);
862 err = i8k_get_fan_type(2);
864 i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN3;
866 i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm",
868 if (IS_ERR(i8k_hwmon_dev)) {
869 err = PTR_ERR(i8k_hwmon_dev);
870 i8k_hwmon_dev = NULL;
871 pr_err("hwmon registration failed (%d)\n", err);
877 struct i8k_config_data {
889 static const struct i8k_config_data i8k_config_data[] = {
890 [DELL_LATITUDE_D520] = {
892 .fan_max = I8K_FAN_TURBO,
894 [DELL_PRECISION_490] = {
896 .fan_max = I8K_FAN_TURBO,
900 .fan_max = I8K_FAN_HIGH,
904 .fan_max = I8K_FAN_HIGH,
908 static const struct dmi_system_id i8k_dmi_table[] __initconst = {
910 .ident = "Dell Inspiron",
912 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
913 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
917 .ident = "Dell Latitude",
919 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
920 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
924 .ident = "Dell Inspiron 2",
926 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
927 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
931 .ident = "Dell Latitude D520",
933 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
934 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"),
936 .driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520],
939 .ident = "Dell Latitude 2",
941 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
942 DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
945 { /* UK Inspiron 6400 */
946 .ident = "Dell Inspiron 3",
948 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
949 DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
953 .ident = "Dell Inspiron 3",
955 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
956 DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
960 .ident = "Dell Precision 490",
962 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
963 DMI_MATCH(DMI_PRODUCT_NAME,
964 "Precision WorkStation 490"),
966 .driver_data = (void *)&i8k_config_data[DELL_PRECISION_490],
969 .ident = "Dell Precision",
971 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
972 DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
976 .ident = "Dell Vostro",
978 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
979 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
983 .ident = "Dell XPS421",
985 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
986 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
990 .ident = "Dell Studio",
992 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
993 DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
995 .driver_data = (void *)&i8k_config_data[DELL_STUDIO],
998 .ident = "Dell XPS 13",
1000 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1001 DMI_MATCH(DMI_PRODUCT_NAME, "XPS13"),
1003 .driver_data = (void *)&i8k_config_data[DELL_XPS],
1006 .ident = "Dell XPS M140",
1008 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1009 DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
1011 .driver_data = (void *)&i8k_config_data[DELL_XPS],
1014 .ident = "Dell XPS 15 9560",
1016 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1017 DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9560"),
1023 MODULE_DEVICE_TABLE(dmi, i8k_dmi_table);
1026 * On some machines once I8K_SMM_GET_FAN_TYPE is issued then CPU fan speed
1027 * randomly going up and down due to bug in Dell SMM or BIOS. Here is blacklist
1028 * of affected Dell machines for which we disallow I8K_SMM_GET_FAN_TYPE call.
1029 * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121
1031 static const struct dmi_system_id i8k_blacklist_fan_type_dmi_table[] __initconst = {
1033 .ident = "Dell Studio XPS 8000",
1035 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1036 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000"),
1040 .ident = "Dell Studio XPS 8100",
1042 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1043 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"),
1047 .ident = "Dell Inspiron 580",
1049 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1050 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 580 "),
1057 * On some machines all fan related SMM functions implemented by Dell BIOS
1058 * firmware freeze kernel for about 500ms. Until Dell fixes these problems fan
1059 * support for affected blacklisted Dell machines stay disabled.
1060 * See bug: https://bugzilla.kernel.org/show_bug.cgi?id=195751
1062 static struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initdata = {
1064 .ident = "Dell Inspiron 7720",
1066 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1067 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
1071 .ident = "Dell Vostro 3360",
1073 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1074 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
1078 .ident = "Dell XPS13 9333",
1080 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1081 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
1088 * Probe for the presence of a supported laptop.
1090 static int __init i8k_probe(void)
1092 const struct dmi_system_id *id;
1096 * Get DMI information
1098 if (!dmi_check_system(i8k_dmi_table)) {
1099 if (!ignore_dmi && !force)
1102 pr_info("not running on a supported Dell system.\n");
1103 pr_info("vendor=%s, model=%s, version=%s\n",
1104 i8k_get_dmi_data(DMI_SYS_VENDOR),
1105 i8k_get_dmi_data(DMI_PRODUCT_NAME),
1106 i8k_get_dmi_data(DMI_BIOS_VERSION));
1109 if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) {
1110 pr_warn("broken Dell BIOS detected, disallow fan support\n");
1112 disallow_fan_support = true;
1115 if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) {
1116 pr_warn("broken Dell BIOS detected, disallow fan type call\n");
1118 disallow_fan_type_call = true;
1121 strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
1122 sizeof(bios_version));
1123 strlcpy(bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
1124 sizeof(bios_machineid));
1127 * Get SMM Dell signature
1129 if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
1130 i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
1131 pr_err("unable to get SMM Dell signature\n");
1137 * Set fan multiplier and maximal fan speed from dmi config
1138 * Values specified in module parameters override values from dmi
1140 id = dmi_first_match(i8k_dmi_table);
1141 if (id && id->driver_data) {
1142 const struct i8k_config_data *conf = id->driver_data;
1143 if (!fan_mult && conf->fan_mult)
1144 fan_mult = conf->fan_mult;
1145 if (!fan_max && conf->fan_max)
1146 fan_max = conf->fan_max;
1149 i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */
1150 i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);
1154 * Autodetect fan multiplier based on nominal rpm
1155 * If fan reports rpm value too high then set multiplier to 1
1157 for (fan = 0; fan < 2; ++fan) {
1158 ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max);
1161 if (ret > I8K_FAN_MAX_RPM)
1166 /* Fan multiplier was specified in module param or in dmi */
1167 i8k_fan_mult = fan_mult;
1173 static int __init i8k_init(void)
1177 /* Are we running on an supported laptop? */
1181 err = i8k_init_hwmon();
1189 static void __exit i8k_exit(void)
1191 hwmon_device_unregister(i8k_hwmon_dev);
1195 module_init(i8k_init);
1196 module_exit(i8k_exit);