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kernel/drivers/hwmon/dell-smm-hwmon.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* dell-smm-hwmon.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
*
* Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org>
*
* Hwmon integration:
* Copyright (C) 2011 Jean Delvare <jdelvare@suse.de>
* Copyright (C) 2013, 2014 Guenter Roeck <linux@roeck-us.net>
* Copyright (C) 2014, 2015 Pali Rohár <pali@kernel.org>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/cpu.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/dmi.h>
#include <linux/capability.h>
#include <linux/mutex.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/sched.h>
#include <linux/ctype.h>
#include <linux/smp.h>
#include <linux/i8k.h>
#define I8K_SMM_FN_STATUS 0x0025
#define I8K_SMM_POWER_STATUS 0x0069
#define I8K_SMM_SET_FAN 0x01a3
#define I8K_SMM_GET_FAN 0x00a3
#define I8K_SMM_GET_SPEED 0x02a3
#define I8K_SMM_GET_FAN_TYPE 0x03a3
#define I8K_SMM_GET_NOM_SPEED 0x04a3
#define I8K_SMM_GET_TEMP 0x10a3
#define I8K_SMM_GET_TEMP_TYPE 0x11a3
#define I8K_SMM_GET_DELL_SIG1 0xfea3
#define I8K_SMM_GET_DELL_SIG2 0xffa3
#define I8K_FAN_MULT 30
#define I8K_FAN_MAX_RPM 30000
#define I8K_MAX_TEMP 127
#define I8K_FN_NONE 0x00
#define I8K_FN_UP 0x01
#define I8K_FN_DOWN 0x02
#define I8K_FN_MUTE 0x04
#define I8K_FN_MASK 0x07
#define I8K_FN_SHIFT 8
#define I8K_POWER_AC 0x05
#define I8K_POWER_BATTERY 0x01
static DEFINE_MUTEX(i8k_mutex);
static char bios_version[4];
static char bios_machineid[16];
static struct device *i8k_hwmon_dev;
static u32 i8k_hwmon_flags;
static uint i8k_fan_mult = I8K_FAN_MULT;
static uint i8k_pwm_mult;
static uint i8k_fan_max = I8K_FAN_HIGH;
static bool disallow_fan_type_call;
static bool disallow_fan_support;
static unsigned int manual_fan;
static unsigned int auto_fan;
#define I8K_HWMON_HAVE_TEMP1 (1 << 0)
#define I8K_HWMON_HAVE_TEMP2 (1 << 1)
#define I8K_HWMON_HAVE_TEMP3 (1 << 2)
#define I8K_HWMON_HAVE_TEMP4 (1 << 3)
#define I8K_HWMON_HAVE_TEMP5 (1 << 4)
#define I8K_HWMON_HAVE_TEMP6 (1 << 5)
#define I8K_HWMON_HAVE_TEMP7 (1 << 6)
#define I8K_HWMON_HAVE_TEMP8 (1 << 7)
#define I8K_HWMON_HAVE_TEMP9 (1 << 8)
#define I8K_HWMON_HAVE_TEMP10 (1 << 9)
#define I8K_HWMON_HAVE_FAN1 (1 << 10)
#define I8K_HWMON_HAVE_FAN2 (1 << 11)
#define I8K_HWMON_HAVE_FAN3 (1 << 12)
MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
MODULE_AUTHOR("Pali Rohár <pali@kernel.org>");
MODULE_DESCRIPTION("Dell laptop SMM BIOS hwmon driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("i8k");
static bool force;
module_param(force, bool, 0);
MODULE_PARM_DESC(force, "Force loading without checking for supported models");
static bool ignore_dmi;
module_param(ignore_dmi, bool, 0);
MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
#if IS_ENABLED(CONFIG_I8K)
static bool restricted = true;
module_param(restricted, bool, 0);
MODULE_PARM_DESC(restricted, "Restrict fan control and serial number to CAP_SYS_ADMIN (default: 1)");
static bool power_status;
module_param(power_status, bool, 0600);
MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k (default: 0)");
#endif
static uint fan_mult;
module_param(fan_mult, uint, 0);
MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)");
static uint fan_max;
module_param(fan_max, uint, 0);
MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)");
struct smm_regs {
unsigned int eax;
unsigned int ebx __packed;
unsigned int ecx __packed;
unsigned int edx __packed;
unsigned int esi __packed;
unsigned int edi __packed;
};
static inline const char *i8k_get_dmi_data(int field)
{
const char *dmi_data = dmi_get_system_info(field);
return dmi_data && *dmi_data ? dmi_data : "?";
}
/*
* Call the System Management Mode BIOS. Code provided by Jonathan Buzzard.
*/
static int i8k_smm_func(void *par)
{
int rc;
struct smm_regs *regs = par;
int eax = regs->eax;
#ifdef DEBUG
int ebx = regs->ebx;
unsigned long duration;
ktime_t calltime, delta, rettime;
calltime = ktime_get();
#endif
/* SMM requires CPU 0 */
if (smp_processor_id() != 0)
return -EBUSY;
#if defined(CONFIG_X86_64)
asm volatile("pushq %%rax\n\t"
"movl 0(%%rax),%%edx\n\t"
"pushq %%rdx\n\t"
"movl 4(%%rax),%%ebx\n\t"
"movl 8(%%rax),%%ecx\n\t"
"movl 12(%%rax),%%edx\n\t"
"movl 16(%%rax),%%esi\n\t"
"movl 20(%%rax),%%edi\n\t"
"popq %%rax\n\t"
"out %%al,$0xb2\n\t"
"out %%al,$0x84\n\t"
"xchgq %%rax,(%%rsp)\n\t"
"movl %%ebx,4(%%rax)\n\t"
"movl %%ecx,8(%%rax)\n\t"
"movl %%edx,12(%%rax)\n\t"
"movl %%esi,16(%%rax)\n\t"
"movl %%edi,20(%%rax)\n\t"
"popq %%rdx\n\t"
"movl %%edx,0(%%rax)\n\t"
"pushfq\n\t"
"popq %%rax\n\t"
"andl $1,%%eax\n"
: "=a"(rc)
: "a"(regs)
: "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
#else
asm volatile("pushl %%eax\n\t"
"movl 0(%%eax),%%edx\n\t"
"push %%edx\n\t"
"movl 4(%%eax),%%ebx\n\t"
"movl 8(%%eax),%%ecx\n\t"
"movl 12(%%eax),%%edx\n\t"
"movl 16(%%eax),%%esi\n\t"
"movl 20(%%eax),%%edi\n\t"
"popl %%eax\n\t"
"out %%al,$0xb2\n\t"
"out %%al,$0x84\n\t"
"xchgl %%eax,(%%esp)\n\t"
"movl %%ebx,4(%%eax)\n\t"
"movl %%ecx,8(%%eax)\n\t"
"movl %%edx,12(%%eax)\n\t"
"movl %%esi,16(%%eax)\n\t"
"movl %%edi,20(%%eax)\n\t"
"popl %%edx\n\t"
"movl %%edx,0(%%eax)\n\t"
"lahf\n\t"
"shrl $8,%%eax\n\t"
"andl $1,%%eax\n"
: "=a"(rc)
: "a"(regs)
: "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
#endif
if (rc != 0 || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
rc = -EINVAL;
#ifdef DEBUG
rettime = ktime_get();
delta = ktime_sub(rettime, calltime);
duration = ktime_to_ns(delta) >> 10;
pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lu usecs)\n", eax, ebx,
(rc ? 0xffff : regs->eax & 0xffff), duration);
#endif
return rc;
}
/*
* Call the System Management Mode BIOS.
*/
static int i8k_smm(struct smm_regs *regs)
{
int ret;
cpus_read_lock();
ret = smp_call_on_cpu(0, i8k_smm_func, regs, true);
cpus_read_unlock();
return ret;
}
/*
* Read the fan status.
*/
static int i8k_get_fan_status(int fan)
{
struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
if (disallow_fan_support)
return -EINVAL;
regs.ebx = fan & 0xff;
return i8k_smm(&regs) ? : regs.eax & 0xff;
}
/*
* Read the fan speed in RPM.
*/
static int i8k_get_fan_speed(int fan)
{
struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
if (disallow_fan_support)
return -EINVAL;
regs.ebx = fan & 0xff;
return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
}
/*
* Read the fan type.
*/
static int _i8k_get_fan_type(int fan)
{
struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, };
if (disallow_fan_support || disallow_fan_type_call)
return -EINVAL;
regs.ebx = fan & 0xff;
return i8k_smm(&regs) ? : regs.eax & 0xff;
}
static int i8k_get_fan_type(int fan)
{
/* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */
static int types[3] = { INT_MIN, INT_MIN, INT_MIN };
if (types[fan] == INT_MIN)
types[fan] = _i8k_get_fan_type(fan);
return types[fan];
}
/*
* Read the fan nominal rpm for specific fan speed.
*/
static int i8k_get_fan_nominal_speed(int fan, int speed)
{
struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, };
if (disallow_fan_support)
return -EINVAL;
regs.ebx = (fan & 0xff) | (speed << 8);
return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
}
/*
* Enable or disable automatic BIOS fan control support
*/
static int i8k_enable_fan_auto_mode(bool enable)
{
struct smm_regs regs = { };
if (disallow_fan_support)
return -EINVAL;
regs.eax = enable ? auto_fan : manual_fan;
return i8k_smm(&regs);
}
/*
* Set the fan speed (off, low, high). Returns the new fan status.
*/
static int i8k_set_fan(int fan, int speed)
{
struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
if (disallow_fan_support)
return -EINVAL;
speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed);
regs.ebx = (fan & 0xff) | (speed << 8);
return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
}
static int i8k_get_temp_type(int sensor)
{
struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, };
regs.ebx = sensor & 0xff;
return i8k_smm(&regs) ? : regs.eax & 0xff;
}
/*
* Read the cpu temperature.
*/
static int _i8k_get_temp(int sensor)
{
struct smm_regs regs = {
.eax = I8K_SMM_GET_TEMP,
.ebx = sensor & 0xff,
};
return i8k_smm(&regs) ? : regs.eax & 0xff;
}
static int i8k_get_temp(int sensor)
{
int temp = _i8k_get_temp(sensor);
/*
* Sometimes the temperature sensor returns 0x99, which is out of range.
* In this case we retry (once) before returning an error.
# 1003655137 00000058 00005a4b
# 1003655138 00000099 00003a80 <--- 0x99 = 153 degrees
# 1003655139 00000054 00005c52
*/
if (temp == 0x99) {
msleep(100);
temp = _i8k_get_temp(sensor);
}
/*
* Return -ENODATA for all invalid temperatures.
*
* Known instances are the 0x99 value as seen above as well as
* 0xc1 (193), which may be returned when trying to read the GPU
* temperature if the system supports a GPU and it is currently
* turned off.
*/
if (temp > I8K_MAX_TEMP)
return -ENODATA;
return temp;
}
static int i8k_get_dell_signature(int req_fn)
{
struct smm_regs regs = { .eax = req_fn, };
int rc;
rc = i8k_smm(&regs);
if (rc < 0)
return rc;
return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
}
#if IS_ENABLED(CONFIG_I8K)
/*
* Read the Fn key status.
*/
static int i8k_get_fn_status(void)
{
struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
int rc;
rc = i8k_smm(&regs);
if (rc < 0)
return rc;
switch ((regs.eax >> I8K_FN_SHIFT) & I8K_FN_MASK) {
case I8K_FN_UP:
return I8K_VOL_UP;
case I8K_FN_DOWN:
return I8K_VOL_DOWN;
case I8K_FN_MUTE:
return I8K_VOL_MUTE;
default:
return 0;
}
}
/*
* Read the power status.
*/
static int i8k_get_power_status(void)
{
struct smm_regs regs = { .eax = I8K_SMM_POWER_STATUS, };
int rc;
rc = i8k_smm(&regs);
if (rc < 0)
return rc;
return (regs.eax & 0xff) == I8K_POWER_AC ? I8K_AC : I8K_BATTERY;
}
/*
* Procfs interface
*/
static int
i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
{
int val = 0;
int speed;
unsigned char buff[16];
int __user *argp = (int __user *)arg;
if (!argp)
return -EINVAL;
switch (cmd) {
case I8K_BIOS_VERSION:
if (!isdigit(bios_version[0]) || !isdigit(bios_version[1]) ||
!isdigit(bios_version[2]))
return -EINVAL;
val = (bios_version[0] << 16) |
(bios_version[1] << 8) | bios_version[2];
break;
case I8K_MACHINE_ID:
if (restricted && !capable(CAP_SYS_ADMIN))
return -EPERM;
memset(buff, 0, sizeof(buff));
strlcpy(buff, bios_machineid, sizeof(buff));
break;
case I8K_FN_STATUS:
val = i8k_get_fn_status();
break;
case I8K_POWER_STATUS:
val = i8k_get_power_status();
break;
case I8K_GET_TEMP:
val = i8k_get_temp(0);
break;
case I8K_GET_SPEED:
if (copy_from_user(&val, argp, sizeof(int)))
return -EFAULT;
val = i8k_get_fan_speed(val);
break;
case I8K_GET_FAN:
if (copy_from_user(&val, argp, sizeof(int)))
return -EFAULT;
val = i8k_get_fan_status(val);
break;
case I8K_SET_FAN:
if (restricted && !capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&val, argp, sizeof(int)))
return -EFAULT;
if (copy_from_user(&speed, argp + 1, sizeof(int)))
return -EFAULT;
val = i8k_set_fan(val, speed);
break;
default:
return -EINVAL;
}
if (val < 0)
return val;
switch (cmd) {
case I8K_BIOS_VERSION:
if (copy_to_user(argp, &val, 4))
return -EFAULT;
break;
case I8K_MACHINE_ID:
if (copy_to_user(argp, buff, 16))
return -EFAULT;
break;
default:
if (copy_to_user(argp, &val, sizeof(int)))
return -EFAULT;
break;
}
return 0;
}
static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
{
long ret;
mutex_lock(&i8k_mutex);
ret = i8k_ioctl_unlocked(fp, cmd, arg);
mutex_unlock(&i8k_mutex);
return ret;
}
/*
* Print the information for /proc/i8k.
*/
static int i8k_proc_show(struct seq_file *seq, void *offset)
{
int fn_key, cpu_temp, ac_power;
int left_fan, right_fan, left_speed, right_speed;
cpu_temp = i8k_get_temp(0); /* 11100 µs */
left_fan = i8k_get_fan_status(I8K_FAN_LEFT); /* 580 µs */
right_fan = i8k_get_fan_status(I8K_FAN_RIGHT); /* 580 µs */
left_speed = i8k_get_fan_speed(I8K_FAN_LEFT); /* 580 µs */
right_speed = i8k_get_fan_speed(I8K_FAN_RIGHT); /* 580 µs */
fn_key = i8k_get_fn_status(); /* 750 µs */
if (power_status)
ac_power = i8k_get_power_status(); /* 14700 µs */
else
ac_power = -1;
/*
* Info:
*
* 1) Format version (this will change if format changes)
* 2) BIOS version
* 3) BIOS machine ID
* 4) Cpu temperature
* 5) Left fan status
* 6) Right fan status
* 7) Left fan speed
* 8) Right fan speed
* 9) AC power
* 10) Fn Key status
*/
seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
I8K_PROC_FMT,
bios_version,
(restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : bios_machineid,
cpu_temp,
left_fan, right_fan, left_speed, right_speed,
ac_power, fn_key);
return 0;
}
static int i8k_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, i8k_proc_show, NULL);
}
static const struct proc_ops i8k_proc_ops = {
.proc_open = i8k_open_fs,
.proc_read = seq_read,
.proc_lseek = seq_lseek,
.proc_release = single_release,
.proc_ioctl = i8k_ioctl,
};
static void __init i8k_init_procfs(void)
{
/* Register the proc entry */
proc_create("i8k", 0, NULL, &i8k_proc_ops);
}
static void __exit i8k_exit_procfs(void)
{
remove_proc_entry("i8k", NULL);
}
#else
static inline void __init i8k_init_procfs(void)
{
}
static inline void __exit i8k_exit_procfs(void)
{
}
#endif
/*
* Hwmon interface
*/
static ssize_t i8k_hwmon_temp_label_show(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
static const char * const labels[] = {
"CPU",
"GPU",
"SODIMM",
"Other",
"Ambient",
"Other",
};
int index = to_sensor_dev_attr(devattr)->index;
int type;
type = i8k_get_temp_type(index);
if (type < 0)
return type;
if (type >= ARRAY_SIZE(labels))
type = ARRAY_SIZE(labels) - 1;
return sprintf(buf, "%s\n", labels[type]);
}
static ssize_t i8k_hwmon_temp_show(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
int index = to_sensor_dev_attr(devattr)->index;
int temp;
temp = i8k_get_temp(index);
if (temp < 0)
return temp;
return sprintf(buf, "%d\n", temp * 1000);
}
static ssize_t i8k_hwmon_fan_label_show(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
static const char * const labels[] = {
"Processor Fan",
"Motherboard Fan",
"Video Fan",
"Power Supply Fan",
"Chipset Fan",
"Other Fan",
};
int index = to_sensor_dev_attr(devattr)->index;
bool dock = false;
int type;
type = i8k_get_fan_type(index);
if (type < 0)
return type;
if (type & 0x10) {
dock = true;
type &= 0x0F;
}
if (type >= ARRAY_SIZE(labels))
type = (ARRAY_SIZE(labels) - 1);
return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]);
}
static ssize_t i8k_hwmon_fan_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int index = to_sensor_dev_attr(devattr)->index;
int fan_speed;
fan_speed = i8k_get_fan_speed(index);
if (fan_speed < 0)
return fan_speed;
return sprintf(buf, "%d\n", fan_speed);
}
static ssize_t i8k_hwmon_pwm_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
int index = to_sensor_dev_attr(devattr)->index;
int status;
status = i8k_get_fan_status(index);
if (status < 0)
return -EIO;
return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255));
}
static ssize_t i8k_hwmon_pwm_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int index = to_sensor_dev_attr(attr)->index;
unsigned long val;
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max);
mutex_lock(&i8k_mutex);
err = i8k_set_fan(index, val);
mutex_unlock(&i8k_mutex);
return err < 0 ? -EIO : count;
}
static ssize_t i8k_hwmon_pwm_enable_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int err;
bool enable;
unsigned long val;
if (!auto_fan)
return -ENODEV;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
if (val == 1)
enable = false;
else if (val == 2)
enable = true;
else
return -EINVAL;
mutex_lock(&i8k_mutex);
err = i8k_enable_fan_auto_mode(enable);
mutex_unlock(&i8k_mutex);
return err ? err : count;
}
static SENSOR_DEVICE_ATTR_RO(temp1_input, i8k_hwmon_temp, 0);
static SENSOR_DEVICE_ATTR_RO(temp1_label, i8k_hwmon_temp_label, 0);
static SENSOR_DEVICE_ATTR_RO(temp2_input, i8k_hwmon_temp, 1);
static SENSOR_DEVICE_ATTR_RO(temp2_label, i8k_hwmon_temp_label, 1);
static SENSOR_DEVICE_ATTR_RO(temp3_input, i8k_hwmon_temp, 2);
static SENSOR_DEVICE_ATTR_RO(temp3_label, i8k_hwmon_temp_label, 2);
static SENSOR_DEVICE_ATTR_RO(temp4_input, i8k_hwmon_temp, 3);
static SENSOR_DEVICE_ATTR_RO(temp4_label, i8k_hwmon_temp_label, 3);
static SENSOR_DEVICE_ATTR_RO(temp5_input, i8k_hwmon_temp, 4);
static SENSOR_DEVICE_ATTR_RO(temp5_label, i8k_hwmon_temp_label, 4);
static SENSOR_DEVICE_ATTR_RO(temp6_input, i8k_hwmon_temp, 5);
static SENSOR_DEVICE_ATTR_RO(temp6_label, i8k_hwmon_temp_label, 5);
static SENSOR_DEVICE_ATTR_RO(temp7_input, i8k_hwmon_temp, 6);
static SENSOR_DEVICE_ATTR_RO(temp7_label, i8k_hwmon_temp_label, 6);
static SENSOR_DEVICE_ATTR_RO(temp8_input, i8k_hwmon_temp, 7);
static SENSOR_DEVICE_ATTR_RO(temp8_label, i8k_hwmon_temp_label, 7);
static SENSOR_DEVICE_ATTR_RO(temp9_input, i8k_hwmon_temp, 8);
static SENSOR_DEVICE_ATTR_RO(temp9_label, i8k_hwmon_temp_label, 8);
static SENSOR_DEVICE_ATTR_RO(temp10_input, i8k_hwmon_temp, 9);
static SENSOR_DEVICE_ATTR_RO(temp10_label, i8k_hwmon_temp_label, 9);
static SENSOR_DEVICE_ATTR_RO(fan1_input, i8k_hwmon_fan, 0);
static SENSOR_DEVICE_ATTR_RO(fan1_label, i8k_hwmon_fan_label, 0);
static SENSOR_DEVICE_ATTR_RW(pwm1, i8k_hwmon_pwm, 0);
static SENSOR_DEVICE_ATTR_WO(pwm1_enable, i8k_hwmon_pwm_enable, 0);
static SENSOR_DEVICE_ATTR_RO(fan2_input, i8k_hwmon_fan, 1);
static SENSOR_DEVICE_ATTR_RO(fan2_label, i8k_hwmon_fan_label, 1);
static SENSOR_DEVICE_ATTR_RW(pwm2, i8k_hwmon_pwm, 1);
static SENSOR_DEVICE_ATTR_RO(fan3_input, i8k_hwmon_fan, 2);
static SENSOR_DEVICE_ATTR_RO(fan3_label, i8k_hwmon_fan_label, 2);
static SENSOR_DEVICE_ATTR_RW(pwm3, i8k_hwmon_pwm, 2);
static struct attribute *i8k_attrs[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */
&sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */
&sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */
&sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */
&sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */
&sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */
&sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */
&sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */
&sensor_dev_attr_temp5_input.dev_attr.attr, /* 8 */
&sensor_dev_attr_temp5_label.dev_attr.attr, /* 9 */
&sensor_dev_attr_temp6_input.dev_attr.attr, /* 10 */
&sensor_dev_attr_temp6_label.dev_attr.attr, /* 11 */
&sensor_dev_attr_temp7_input.dev_attr.attr, /* 12 */
&sensor_dev_attr_temp7_label.dev_attr.attr, /* 13 */
&sensor_dev_attr_temp8_input.dev_attr.attr, /* 14 */
&sensor_dev_attr_temp8_label.dev_attr.attr, /* 15 */
&sensor_dev_attr_temp9_input.dev_attr.attr, /* 16 */
&sensor_dev_attr_temp9_label.dev_attr.attr, /* 17 */
&sensor_dev_attr_temp10_input.dev_attr.attr, /* 18 */
&sensor_dev_attr_temp10_label.dev_attr.attr, /* 19 */
&sensor_dev_attr_fan1_input.dev_attr.attr, /* 20 */
&sensor_dev_attr_fan1_label.dev_attr.attr, /* 21 */
&sensor_dev_attr_pwm1.dev_attr.attr, /* 22 */
&sensor_dev_attr_pwm1_enable.dev_attr.attr, /* 23 */
&sensor_dev_attr_fan2_input.dev_attr.attr, /* 24 */
&sensor_dev_attr_fan2_label.dev_attr.attr, /* 25 */
&sensor_dev_attr_pwm2.dev_attr.attr, /* 26 */
&sensor_dev_attr_fan3_input.dev_attr.attr, /* 27 */
&sensor_dev_attr_fan3_label.dev_attr.attr, /* 28 */
&sensor_dev_attr_pwm3.dev_attr.attr, /* 29 */
NULL
};
static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
int index)
{
if (disallow_fan_support && index >= 20)
return 0;
if (disallow_fan_type_call &&
(index == 21 || index == 25 || index == 28))
return 0;
if (index >= 0 && index <= 1 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
return 0;
if (index >= 2 && index <= 3 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
return 0;
if (index >= 4 && index <= 5 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
return 0;
if (index >= 6 && index <= 7 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
return 0;
if (index >= 8 && index <= 9 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP5))
return 0;
if (index >= 10 && index <= 11 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP6))
return 0;
if (index >= 12 && index <= 13 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP7))
return 0;
if (index >= 14 && index <= 15 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP8))
return 0;
if (index >= 16 && index <= 17 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP9))
return 0;
if (index >= 18 && index <= 19 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP10))
return 0;
if (index >= 20 && index <= 23 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
return 0;
if (index >= 24 && index <= 26 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
return 0;
if (index >= 27 && index <= 29 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN3))
return 0;
if (index == 23 && !auto_fan)
return 0;
return attr->mode;
}
static const struct attribute_group i8k_group = {
.attrs = i8k_attrs,
.is_visible = i8k_is_visible,
};
__ATTRIBUTE_GROUPS(i8k);
static int __init i8k_init_hwmon(void)
{
int err;
i8k_hwmon_flags = 0;
/* CPU temperature attributes, if temperature type is OK */
err = i8k_get_temp_type(0);
if (err >= 0)
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1;
/* check for additional temperature sensors */
err = i8k_get_temp_type(1);
if (err >= 0)
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2;
err = i8k_get_temp_type(2);
if (err >= 0)
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3;
err = i8k_get_temp_type(3);
if (err >= 0)
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
err = i8k_get_temp_type(4);
if (err >= 0)
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP5;
err = i8k_get_temp_type(5);
if (err >= 0)
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP6;
err = i8k_get_temp_type(6);
if (err >= 0)
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP7;
err = i8k_get_temp_type(7);
if (err >= 0)
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP8;
err = i8k_get_temp_type(8);
if (err >= 0)
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP9;
err = i8k_get_temp_type(9);
if (err >= 0)
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP10;
/* First fan attributes, if fan status or type is OK */
err = i8k_get_fan_status(0);
if (err < 0)
err = i8k_get_fan_type(0);
if (err >= 0)
i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
/* Second fan attributes, if fan status or type is OK */
err = i8k_get_fan_status(1);
if (err < 0)
err = i8k_get_fan_type(1);
if (err >= 0)
i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
/* Third fan attributes, if fan status or type is OK */
err = i8k_get_fan_status(2);
if (err < 0)
err = i8k_get_fan_type(2);
if (err >= 0)
i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN3;
i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "dell_smm",
NULL, i8k_groups);
if (IS_ERR(i8k_hwmon_dev)) {
err = PTR_ERR(i8k_hwmon_dev);
i8k_hwmon_dev = NULL;
pr_err("hwmon registration failed (%d)\n", err);
return err;
}
return 0;
}
struct i8k_config_data {
uint fan_mult;
uint fan_max;
};
enum i8k_configs {
DELL_LATITUDE_D520,
DELL_PRECISION_490,
DELL_STUDIO,
DELL_XPS,
};
static const struct i8k_config_data i8k_config_data[] = {
[DELL_LATITUDE_D520] = {
.fan_mult = 1,
.fan_max = I8K_FAN_TURBO,
},
[DELL_PRECISION_490] = {
.fan_mult = 1,
.fan_max = I8K_FAN_TURBO,
},
[DELL_STUDIO] = {
.fan_mult = 1,
.fan_max = I8K_FAN_HIGH,
},
[DELL_XPS] = {
.fan_mult = 1,
.fan_max = I8K_FAN_HIGH,
},
};
static const struct dmi_system_id i8k_dmi_table[] __initconst = {
{
.ident = "Dell Inspiron",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
},
},
{
.ident = "Dell Latitude",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer"),
DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
},
},
{
.ident = "Dell Inspiron 2",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
},
},
{
.ident = "Dell Latitude D520",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "Latitude D520"),
},
.driver_data = (void *)&i8k_config_data[DELL_LATITUDE_D520],
},
{
.ident = "Dell Latitude 2",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
},
},
{ /* UK Inspiron 6400 */
.ident = "Dell Inspiron 3",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "MM061"),
},
},
{
.ident = "Dell Inspiron 3",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "MP061"),
},
},
{
.ident = "Dell Precision 490",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME,
"Precision WorkStation 490"),
},
.driver_data = (void *)&i8k_config_data[DELL_PRECISION_490],
},
{
.ident = "Dell Precision",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "Precision"),
},
},
{
.ident = "Dell Vostro",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "Vostro"),
},
},
{
.ident = "Dell Studio",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),
},
.driver_data = (void *)&i8k_config_data[DELL_STUDIO],
},
{
.ident = "Dell XPS M140",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),
},
.driver_data = (void *)&i8k_config_data[DELL_XPS],
},
{
.ident = "Dell XPS",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "XPS"),
},
},
{ }
};
MODULE_DEVICE_TABLE(dmi, i8k_dmi_table);
/*
* On some machines once I8K_SMM_GET_FAN_TYPE is issued then CPU fan speed
* randomly going up and down due to bug in Dell SMM or BIOS. Here is blacklist
* of affected Dell machines for which we disallow I8K_SMM_GET_FAN_TYPE call.
* See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121
*/
static const struct dmi_system_id i8k_blacklist_fan_type_dmi_table[] __initconst = {
{
.ident = "Dell Studio XPS 8000",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8000"),
},
},
{
.ident = "Dell Studio XPS 8100",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Studio XPS 8100"),
},
},
{
.ident = "Dell Inspiron 580",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 580 "),
},
},
{ }
};
/*
* On some machines all fan related SMM functions implemented by Dell BIOS
* firmware freeze kernel for about 500ms. Until Dell fixes these problems fan
* support for affected blacklisted Dell machines stay disabled.
* See bug: https://bugzilla.kernel.org/show_bug.cgi?id=195751
*/
static struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initdata = {
{
.ident = "Dell Inspiron 7720",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
},
},
{
.ident = "Dell Vostro 3360",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
},
},
{
.ident = "Dell XPS13 9333",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "XPS13 9333"),
},
},
{
.ident = "Dell XPS 15 L502X",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L502X"),
},
},
{ }
};
struct i8k_fan_control_data {
unsigned int manual_fan;
unsigned int auto_fan;
};
enum i8k_fan_controls {
I8K_FAN_34A3_35A3,
};
static const struct i8k_fan_control_data i8k_fan_control_data[] = {
[I8K_FAN_34A3_35A3] = {
.manual_fan = 0x34a3,
.auto_fan = 0x35a3,
},
};
static struct dmi_system_id i8k_whitelist_fan_control[] __initdata = {
{
.ident = "Dell Precision 5530",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Precision 5530"),
},
.driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
},
{
.ident = "Dell Latitude 5480",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude 5480"),
},
.driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
},
{
.ident = "Dell Latitude E6440",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude E6440"),
},
.driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
},
{
.ident = "Dell Precision 7540",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Precision 7540"),
},
.driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
},
{
.ident = "Dell Latitude E7440",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Latitude E7440"),
},
.driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
},
{ }
};
/*
* Probe for the presence of a supported laptop.
*/
static int __init i8k_probe(void)
{
const struct dmi_system_id *id, *fan_control;
int fan, ret;
/*
* Get DMI information
*/
if (!dmi_check_system(i8k_dmi_table)) {
if (!ignore_dmi && !force)
return -ENODEV;
pr_info("not running on a supported Dell system.\n");
pr_info("vendor=%s, model=%s, version=%s\n",
i8k_get_dmi_data(DMI_SYS_VENDOR),
i8k_get_dmi_data(DMI_PRODUCT_NAME),
i8k_get_dmi_data(DMI_BIOS_VERSION));
}
if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) {
pr_warn("broken Dell BIOS detected, disallow fan support\n");
if (!force)
disallow_fan_support = true;
}
if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) {
pr_warn("broken Dell BIOS detected, disallow fan type call\n");
if (!force)
disallow_fan_type_call = true;
}
strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
sizeof(bios_version));
strlcpy(bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
sizeof(bios_machineid));
/*
* Get SMM Dell signature
*/
if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
pr_err("unable to get SMM Dell signature\n");
if (!force)
return -ENODEV;
}
/*
* Set fan multiplier and maximal fan speed from dmi config
* Values specified in module parameters override values from dmi
*/
id = dmi_first_match(i8k_dmi_table);
if (id && id->driver_data) {
const struct i8k_config_data *conf = id->driver_data;
if (!fan_mult && conf->fan_mult)
fan_mult = conf->fan_mult;
if (!fan_max && conf->fan_max)
fan_max = conf->fan_max;
}
i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */
i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);
fan_control = dmi_first_match(i8k_whitelist_fan_control);
if (fan_control && fan_control->driver_data) {
const struct i8k_fan_control_data *data = fan_control->driver_data;
manual_fan = data->manual_fan;
auto_fan = data->auto_fan;
pr_info("enabling support for setting automatic/manual fan control\n");
}
if (!fan_mult) {
/*
* Autodetect fan multiplier based on nominal rpm
* If fan reports rpm value too high then set multiplier to 1
*/
for (fan = 0; fan < 2; ++fan) {
ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max);
if (ret < 0)
continue;
if (ret > I8K_FAN_MAX_RPM)
i8k_fan_mult = 1;
break;
}
} else {
/* Fan multiplier was specified in module param or in dmi */
i8k_fan_mult = fan_mult;
}
return 0;
}
static int __init i8k_init(void)
{
int err;
/* Are we running on an supported laptop? */
if (i8k_probe())
return -ENODEV;
err = i8k_init_hwmon();
if (err)
return err;
i8k_init_procfs();
return 0;
}
static void __exit i8k_exit(void)
{
hwmon_device_unregister(i8k_hwmon_dev);
i8k_exit_procfs();
}
module_init(i8k_init);
module_exit(i8k_exit);
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