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linux/drivers/hwmon/dell-smm-hwmon.c
Pali Rohár 149ed3d404 change email address for Pali Rohár 
For security reasons I stopped using gmail account and kernel address is
now up-to-date alias to my personal address.

People periodically send me emails to address which they found in source
code of drivers, so this change reflects state where people can contact
me.

[ Added .mailmap entry as per Joe Perches  - Linus ]
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Joe Perches <joe@perches.com>
Link: http://lkml.kernel.org/r/20200307104237.8199-1-pali@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-04-10 15:36:22 -07:00

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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;
get_online_cpus();
ret = smp_call_on_cpu(0, i8k_smm_func, regs, true);
put_online_cpus();
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 >= 8)
return 0;
if (disallow_fan_type_call &&
(index == 9 || index == 12 || index == 15))
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 XPS421",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
},
},
{
.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 13",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "XPS13"),
},
.driver_data = (void *)&i8k_config_data[DELL_XPS],
},
{
.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 15 9560",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9560"),
},
},
{
.ident = "Dell XPS 15 9570",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9570"),
},
},
{ }
};
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"),
},
},
{ }
};
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 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],
},
{ }
};
/*
* 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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