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linux/drivers/hwmon/dell-smm-hwmon.c
Armin Wolf 6ebab74e09 hwmon: (dell-smm) Improve warning messages 
When dell-smm-hwmon is loaded on a machine with a buggy BIOS
with the option "force" being enabled, it wrongly prints
that the buggy features where disabled. This may cause
users to wrongly assume that the driver still protects them
from these BIOS bugs even with "force" being enabled.

Replace the messages with two messages each which are depending
on the value of the "force" parameter. The messages which are
being printed when "force" is not set use dev_notice() instead
of dev_warn() since they only serve as a notice.

Tested on a Dell Inspiron 3505.

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Link: https://lore.kernel.org/r/20220822174053.8750-3-W_Armin@gmx.de
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2022-09-19 06:17:05 -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/capability.h>
#include <linux/cpu.h>
#include <linux/ctype.h>
#include <linux/delay.h>
#include <linux/dmi.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/hwmon.h>
#include <linux/init.h>
#include <linux/kconfig.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <linux/thermal.h>
#include <linux/types.h>
#include <linux/uaccess.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
/* in usecs */
#define DELL_SMM_MAX_DURATION 250000
#define I8K_FAN_MULT 30
#define I8K_FAN_RPM_THRESHOLD 1000
#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
#define DELL_SMM_NO_TEMP 10
#define DELL_SMM_NO_FANS 3
struct dell_smm_data {
struct mutex i8k_mutex; /* lock for sensors writes */
char bios_version[4];
char bios_machineid[16];
uint i8k_fan_mult;
uint i8k_pwm_mult;
uint i8k_fan_max;
bool disallow_fan_type_call;
bool disallow_fan_support;
unsigned int manual_fan;
unsigned int auto_fan;
int temp_type[DELL_SMM_NO_TEMP];
bool fan[DELL_SMM_NO_FANS];
int fan_type[DELL_SMM_NO_FANS];
int *fan_nominal_speed[DELL_SMM_NO_FANS];
};
struct dell_smm_cooling_data {
u8 fan_num;
struct dell_smm_data *data;
};
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_unsafe(force, bool, 0);
MODULE_PARM_DESC(force, "Force loading without checking for supported models and features");
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;
unsigned int ecx;
unsigned int edx;
unsigned int esi;
unsigned int edi;
};
static const char * const temp_labels[] = {
"CPU",
"GPU",
"SODIMM",
"Other",
"Ambient",
"Other",
};
static const char * const fan_labels[] = {
"Processor Fan",
"Motherboard Fan",
"Video Fan",
"Power Supply Fan",
"Chipset Fan",
"Other Fan",
};
static const char * const docking_labels[] = {
"Docking Processor Fan",
"Docking Motherboard Fan",
"Docking Video Fan",
"Docking Power Supply Fan",
"Docking Chipset Fan",
"Docking Other Fan",
};
static inline const char __init *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)
{
ktime_t calltime = ktime_get();
struct smm_regs *regs = par;
int eax = regs->eax;
int ebx = regs->ebx;
unsigned char carry;
long long duration;
/* SMM requires CPU 0 */
if (smp_processor_id() != 0)
return -EBUSY;
asm volatile("out %%al,$0xb2\n\t"
"out %%al,$0x84\n\t"
"setc %0\n"
: "=mr" (carry),
"+a" (regs->eax),
"+b" (regs->ebx),
"+c" (regs->ecx),
"+d" (regs->edx),
"+S" (regs->esi),
"+D" (regs->edi));
duration = ktime_us_delta(ktime_get(), calltime);
pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x carry: %d (took %7lld usecs)\n",
eax, ebx, regs->eax & 0xffff, carry, duration);
if (duration > DELL_SMM_MAX_DURATION)
pr_warn_once("SMM call took %lld usecs!\n", duration);
if (carry || (regs->eax & 0xffff) == 0xffff || regs->eax == eax)
return -EINVAL;
return 0;
}
/*
* 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(const struct dell_smm_data *data, u8 fan)
{
struct smm_regs regs = {
.eax = I8K_SMM_GET_FAN,
.ebx = fan,
};
if (data->disallow_fan_support)
return -EINVAL;
return i8k_smm(&regs) ? : regs.eax & 0xff;
}
/*
* Read the fan speed in RPM.
*/
static int i8k_get_fan_speed(const struct dell_smm_data *data, u8 fan)
{
struct smm_regs regs = {
.eax = I8K_SMM_GET_SPEED,
.ebx = fan,
};
if (data->disallow_fan_support)
return -EINVAL;
return i8k_smm(&regs) ? : (regs.eax & 0xffff) * data->i8k_fan_mult;
}
/*
* Read the fan type.
*/
static int _i8k_get_fan_type(const struct dell_smm_data *data, u8 fan)
{
struct smm_regs regs = {
.eax = I8K_SMM_GET_FAN_TYPE,
.ebx = fan,
};
if (data->disallow_fan_support || data->disallow_fan_type_call)
return -EINVAL;
return i8k_smm(&regs) ? : regs.eax & 0xff;
}
static int i8k_get_fan_type(struct dell_smm_data *data, u8 fan)
{
/* I8K_SMM_GET_FAN_TYPE SMM call is expensive, so cache values */
if (data->fan_type[fan] == INT_MIN)
data->fan_type[fan] = _i8k_get_fan_type(data, fan);
return data->fan_type[fan];
}
/*
* Read the fan nominal rpm for specific fan speed.
*/
static int __init i8k_get_fan_nominal_speed(const struct dell_smm_data *data, u8 fan, int speed)
{
struct smm_regs regs = {
.eax = I8K_SMM_GET_NOM_SPEED,
.ebx = fan | (speed << 8),
};
if (data->disallow_fan_support)
return -EINVAL;
return i8k_smm(&regs) ? : (regs.eax & 0xffff);
}
/*
* Enable or disable automatic BIOS fan control support
*/
static int i8k_enable_fan_auto_mode(const struct dell_smm_data *data, bool enable)
{
struct smm_regs regs = { };
if (data->disallow_fan_support)
return -EINVAL;
regs.eax = enable ? data->auto_fan : data->manual_fan;
return i8k_smm(&regs);
}
/*
* Set the fan speed (off, low, high, ...).
*/
static int i8k_set_fan(const struct dell_smm_data *data, u8 fan, int speed)
{
struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };
if (data->disallow_fan_support)
return -EINVAL;
speed = (speed < 0) ? 0 : ((speed > data->i8k_fan_max) ? data->i8k_fan_max : speed);
regs.ebx = fan | (speed << 8);
return i8k_smm(&regs);
}
static int __init i8k_get_temp_type(u8 sensor)
{
struct smm_regs regs = {
.eax = I8K_SMM_GET_TEMP_TYPE,
.ebx = sensor,
};
return i8k_smm(&regs) ? : regs.eax & 0xff;
}
/*
* Read the cpu temperature.
*/
static int _i8k_get_temp(u8 sensor)
{
struct smm_regs regs = {
.eax = I8K_SMM_GET_TEMP,
.ebx = sensor,
};
return i8k_smm(&regs) ? : regs.eax & 0xff;
}
static int i8k_get_temp(u8 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 __init 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 long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
{
struct dell_smm_data *data = pde_data(file_inode(fp));
int __user *argp = (int __user *)arg;
int speed, err;
int val = 0;
if (!argp)
return -EINVAL;
switch (cmd) {
case I8K_BIOS_VERSION:
if (!isdigit(data->bios_version[0]) || !isdigit(data->bios_version[1]) ||
!isdigit(data->bios_version[2]))
return -EINVAL;
val = (data->bios_version[0] << 16) |
(data->bios_version[1] << 8) | data->bios_version[2];
if (copy_to_user(argp, &val, sizeof(val)))
return -EFAULT;
return 0;
case I8K_MACHINE_ID:
if (restricted && !capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_to_user(argp, data->bios_machineid, sizeof(data->bios_machineid)))
return -EFAULT;
return 0;
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;
if (val > U8_MAX || val < 0)
return -EINVAL;
val = i8k_get_fan_speed(data, val);
break;
case I8K_GET_FAN:
if (copy_from_user(&val, argp, sizeof(int)))
return -EFAULT;
if (val > U8_MAX || val < 0)
return -EINVAL;
val = i8k_get_fan_status(data, 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 (val > U8_MAX || val < 0)
return -EINVAL;
if (copy_from_user(&speed, argp + 1, sizeof(int)))
return -EFAULT;
mutex_lock(&data->i8k_mutex);
err = i8k_set_fan(data, val, speed);
if (err < 0)
val = err;
else
val = i8k_get_fan_status(data, val);
mutex_unlock(&data->i8k_mutex);
break;
default:
return -ENOIOCTLCMD;
}
if (val < 0)
return val;
if (copy_to_user(argp, &val, sizeof(int)))
return -EFAULT;
return 0;
}
/*
* Print the information for /proc/i8k.
*/
static int i8k_proc_show(struct seq_file *seq, void *offset)
{
struct dell_smm_data *data = seq->private;
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(data, I8K_FAN_LEFT); /* 580 µs */
right_fan = i8k_get_fan_status(data, I8K_FAN_RIGHT); /* 580 µs */
left_speed = i8k_get_fan_speed(data, I8K_FAN_LEFT); /* 580 µs */
right_speed = i8k_get_fan_speed(data, 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,
data->bios_version,
(restricted && !capable(CAP_SYS_ADMIN)) ? "-1" : data->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, pde_data(inode));
}
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 i8k_exit_procfs(void *param)
{
remove_proc_entry("i8k", NULL);
}
static void __init i8k_init_procfs(struct device *dev)
{
struct dell_smm_data *data = dev_get_drvdata(dev);
/* Only register exit function if creation was successful */
if (proc_create_data("i8k", 0, NULL, &i8k_proc_ops, data))
devm_add_action_or_reset(dev, i8k_exit_procfs, NULL);
}
#else
static void __init i8k_init_procfs(struct device *dev)
{
}
#endif
static int dell_smm_get_max_state(struct thermal_cooling_device *dev, unsigned long *state)
{
struct dell_smm_cooling_data *cdata = dev->devdata;
*state = cdata->data->i8k_fan_max;
return 0;
}
static int dell_smm_get_cur_state(struct thermal_cooling_device *dev, unsigned long *state)
{
struct dell_smm_cooling_data *cdata = dev->devdata;
int ret;
ret = i8k_get_fan_status(cdata->data, cdata->fan_num);
if (ret < 0)
return ret;
*state = ret;
return 0;
}
static int dell_smm_set_cur_state(struct thermal_cooling_device *dev, unsigned long state)
{
struct dell_smm_cooling_data *cdata = dev->devdata;
struct dell_smm_data *data = cdata->data;
int ret;
if (state > data->i8k_fan_max)
return -EINVAL;
mutex_lock(&data->i8k_mutex);
ret = i8k_set_fan(data, cdata->fan_num, (int)state);
mutex_unlock(&data->i8k_mutex);
return ret;
}
static const struct thermal_cooling_device_ops dell_smm_cooling_ops = {
.get_max_state = dell_smm_get_max_state,
.get_cur_state = dell_smm_get_cur_state,
.set_cur_state = dell_smm_set_cur_state,
};
static umode_t dell_smm_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr,
int channel)
{
const struct dell_smm_data *data = drvdata;
switch (type) {
case hwmon_temp:
switch (attr) {
case hwmon_temp_input:
/* _i8k_get_temp() is fine since we do not care about the actual value */
if (data->temp_type[channel] >= 0 || _i8k_get_temp(channel) >= 0)
return 0444;
break;
case hwmon_temp_label:
if (data->temp_type[channel] >= 0)
return 0444;
break;
default:
break;
}
break;
case hwmon_fan:
if (data->disallow_fan_support)
break;
switch (attr) {
case hwmon_fan_input:
if (data->fan[channel])
return 0444;
break;
case hwmon_fan_label:
if (data->fan[channel] && !data->disallow_fan_type_call)
return 0444;
break;
case hwmon_fan_min:
case hwmon_fan_max:
case hwmon_fan_target:
if (data->fan_nominal_speed[channel])
return 0444;
break;
default:
break;
}
break;
case hwmon_pwm:
if (data->disallow_fan_support)
break;
switch (attr) {
case hwmon_pwm_input:
if (data->fan[channel])
return 0644;
break;
case hwmon_pwm_enable:
if (data->auto_fan)
/*
* There is no command for retrieve the current status
* from BIOS, and userspace/firmware itself can change
* it.
* Thus we can only provide write-only access for now.
*/
return 0200;
break;
default:
break;
}
break;
default:
break;
}
return 0;
}
static int dell_smm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
long *val)
{
struct dell_smm_data *data = dev_get_drvdata(dev);
int mult = data->i8k_fan_mult;
int ret;
switch (type) {
case hwmon_temp:
switch (attr) {
case hwmon_temp_input:
ret = i8k_get_temp(channel);
if (ret < 0)
return ret;
*val = ret * 1000;
return 0;
default:
break;
}
break;
case hwmon_fan:
switch (attr) {
case hwmon_fan_input:
ret = i8k_get_fan_speed(data, channel);
if (ret < 0)
return ret;
*val = ret;
return 0;
case hwmon_fan_min:
*val = data->fan_nominal_speed[channel][0] * mult;
return 0;
case hwmon_fan_max:
*val = data->fan_nominal_speed[channel][data->i8k_fan_max] * mult;
return 0;
case hwmon_fan_target:
ret = i8k_get_fan_status(data, channel);
if (ret < 0)
return ret;
if (ret > data->i8k_fan_max)
ret = data->i8k_fan_max;
*val = data->fan_nominal_speed[channel][ret] * mult;
return 0;
default:
break;
}
break;
case hwmon_pwm:
switch (attr) {
case hwmon_pwm_input:
ret = i8k_get_fan_status(data, channel);
if (ret < 0)
return ret;
*val = clamp_val(ret * data->i8k_pwm_mult, 0, 255);
return 0;
default:
break;
}
break;
default:
break;
}
return -EOPNOTSUPP;
}
static const char *dell_smm_fan_label(struct dell_smm_data *data, int channel)
{
bool dock = false;
int type = i8k_get_fan_type(data, channel);
if (type < 0)
return ERR_PTR(type);
if (type & 0x10) {
dock = true;
type &= 0x0F;
}
if (type >= ARRAY_SIZE(fan_labels))
type = ARRAY_SIZE(fan_labels) - 1;
return dock ? docking_labels[type] : fan_labels[type];
}
static int dell_smm_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr,
int channel, const char **str)
{
struct dell_smm_data *data = dev_get_drvdata(dev);
switch (type) {
case hwmon_temp:
switch (attr) {
case hwmon_temp_label:
*str = temp_labels[data->temp_type[channel]];
return 0;
default:
break;
}
break;
case hwmon_fan:
switch (attr) {
case hwmon_fan_label:
*str = dell_smm_fan_label(data, channel);
return PTR_ERR_OR_ZERO(*str);
default:
break;
}
break;
default:
break;
}
return -EOPNOTSUPP;
}
static int dell_smm_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
long val)
{
struct dell_smm_data *data = dev_get_drvdata(dev);
unsigned long pwm;
bool enable;
int err;
switch (type) {
case hwmon_pwm:
switch (attr) {
case hwmon_pwm_input:
pwm = clamp_val(DIV_ROUND_CLOSEST(val, data->i8k_pwm_mult), 0,
data->i8k_fan_max);
mutex_lock(&data->i8k_mutex);
err = i8k_set_fan(data, channel, pwm);
mutex_unlock(&data->i8k_mutex);
if (err < 0)
return err;
return 0;
case hwmon_pwm_enable:
if (!val)
return -EINVAL;
if (val == 1)
enable = false;
else
enable = true;
mutex_lock(&data->i8k_mutex);
err = i8k_enable_fan_auto_mode(data, enable);
mutex_unlock(&data->i8k_mutex);
if (err < 0)
return err;
return 0;
default:
break;
}
break;
default:
break;
}
return -EOPNOTSUPP;
}
static const struct hwmon_ops dell_smm_ops = {
.is_visible = dell_smm_is_visible,
.read = dell_smm_read,
.read_string = dell_smm_read_string,
.write = dell_smm_write,
};
static const struct hwmon_channel_info *dell_smm_info[] = {
HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
HWMON_CHANNEL_INFO(temp,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL
),
HWMON_CHANNEL_INFO(fan,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MIN | HWMON_F_MAX |
HWMON_F_TARGET,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MIN | HWMON_F_MAX |
HWMON_F_TARGET,
HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_MIN | HWMON_F_MAX |
HWMON_F_TARGET
),
HWMON_CHANNEL_INFO(pwm,
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT
),
NULL
};
static const struct hwmon_chip_info dell_smm_chip_info = {
.ops = &dell_smm_ops,
.info = dell_smm_info,
};
static int __init dell_smm_init_cdev(struct device *dev, u8 fan_num)
{
struct dell_smm_data *data = dev_get_drvdata(dev);
struct thermal_cooling_device *cdev;
struct dell_smm_cooling_data *cdata;
int ret = 0;
char *name;
name = kasprintf(GFP_KERNEL, "dell-smm-fan%u", fan_num + 1);
if (!name)
return -ENOMEM;
cdata = devm_kmalloc(dev, sizeof(*cdata), GFP_KERNEL);
if (cdata) {
cdata->fan_num = fan_num;
cdata->data = data;
cdev = devm_thermal_of_cooling_device_register(dev, NULL, name, cdata,
&dell_smm_cooling_ops);
if (IS_ERR(cdev)) {
devm_kfree(dev, cdata);
ret = PTR_ERR(cdev);
}
} else {
ret = -ENOMEM;
}
kfree(name);
return ret;
}
static int __init dell_smm_init_hwmon(struct device *dev)
{
struct dell_smm_data *data = dev_get_drvdata(dev);
struct device *dell_smm_hwmon_dev;
int state, err;
u8 i;
for (i = 0; i < DELL_SMM_NO_TEMP; i++) {
data->temp_type[i] = i8k_get_temp_type(i);
if (data->temp_type[i] < 0)
continue;
if (data->temp_type[i] >= ARRAY_SIZE(temp_labels))
data->temp_type[i] = ARRAY_SIZE(temp_labels) - 1;
}
for (i = 0; i < DELL_SMM_NO_FANS; i++) {
data->fan_type[i] = INT_MIN;
err = i8k_get_fan_status(data, i);
if (err < 0)
err = i8k_get_fan_type(data, i);
if (err < 0)
continue;
data->fan[i] = true;
/* the cooling device is not critical, ignore failures */
if (IS_REACHABLE(CONFIG_THERMAL)) {
err = dell_smm_init_cdev(dev, i);
if (err < 0)
dev_warn(dev, "Failed to register cooling device for fan %u\n",
i + 1);
}
data->fan_nominal_speed[i] = devm_kmalloc_array(dev, data->i8k_fan_max + 1,
sizeof(*data->fan_nominal_speed[i]),
GFP_KERNEL);
if (!data->fan_nominal_speed[i])
continue;
for (state = 0; state <= data->i8k_fan_max; state++) {
err = i8k_get_fan_nominal_speed(data, i, state);
if (err < 0) {
/* Mark nominal speed table as invalid in case of error */
devm_kfree(dev, data->fan_nominal_speed[i]);
data->fan_nominal_speed[i] = NULL;
break;
}
data->fan_nominal_speed[i][state] = err;
/*
* Autodetect fan multiplier based on nominal rpm if multiplier
* was not specified as module param or in DMI. If fan reports
* rpm value too high then set multiplier to 1.
*/
if (!fan_mult && err > I8K_FAN_RPM_THRESHOLD)
data->i8k_fan_mult = 1;
}
}
dell_smm_hwmon_dev = devm_hwmon_device_register_with_info(dev, "dell_smm", data,
&dell_smm_chip_info, NULL);
return PTR_ERR_OR_ZERO(dell_smm_hwmon_dev);
}
struct i8k_config_data {
uint fan_mult;
uint fan_max;
};
enum i8k_configs {
DELL_LATITUDE_D520,
DELL_PRECISION_490,
DELL_STUDIO,
DELL_XPS,
};
/*
* Only use for machines which need some special configuration
* in order to work correctly (e.g. if autoconfig fails on this machines).
*/
static const struct i8k_config_data i8k_config_data[] __initconst = {
[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 G5 5590",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "G5 5590"),
},
},
{
.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 "),
},
},
{
.ident = "Dell Inspiron 3505",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Inspiron 3505"),
},
},
{ }
};
/*
* 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 const struct dmi_system_id i8k_blacklist_fan_support_dmi_table[] __initconst = {
{
.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[] __initconst = {
[I8K_FAN_34A3_35A3] = {
.manual_fan = 0x34a3,
.auto_fan = 0x35a3,
},
};
static const struct dmi_system_id i8k_whitelist_fan_control[] __initconst = {
{
.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 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],
},
{
.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 Precision 7510",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
},
.driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
},
{
.ident = "Dell XPS 13 7390",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "XPS 13 7390"),
},
.driver_data = (void *)&i8k_fan_control_data[I8K_FAN_34A3_35A3],
},
{ }
};
static int __init dell_smm_probe(struct platform_device *pdev)
{
struct dell_smm_data *data;
const struct dmi_system_id *id, *fan_control;
int ret;
data = devm_kzalloc(&pdev->dev, sizeof(struct dell_smm_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
mutex_init(&data->i8k_mutex);
platform_set_drvdata(pdev, data);
if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) {
if (!force) {
dev_notice(&pdev->dev, "Disabling fan support due to BIOS bugs\n");
data->disallow_fan_support = true;
} else {
dev_warn(&pdev->dev, "Enabling fan support despite BIOS bugs\n");
}
}
if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) {
if (!force) {
dev_notice(&pdev->dev, "Disabling fan type call due to BIOS bugs\n");
data->disallow_fan_type_call = true;
} else {
dev_warn(&pdev->dev, "Enabling fan type call despite BIOS bugs\n");
}
}
strscpy(data->bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
sizeof(data->bios_version));
strscpy(data->bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
sizeof(data->bios_machineid));
/*
* 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;
}
/* All options must not be 0 */
data->i8k_fan_mult = fan_mult ? : I8K_FAN_MULT;
data->i8k_fan_max = fan_max ? : I8K_FAN_HIGH;
data->i8k_pwm_mult = DIV_ROUND_UP(255, data->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 *control = fan_control->driver_data;
data->manual_fan = control->manual_fan;
data->auto_fan = control->auto_fan;
dev_info(&pdev->dev, "enabling support for setting automatic/manual fan control\n");
}
ret = dell_smm_init_hwmon(&pdev->dev);
if (ret)
return ret;
i8k_init_procfs(&pdev->dev);
return 0;
}
static struct platform_driver dell_smm_driver = {
.driver = {
.name = KBUILD_MODNAME,
},
};
static struct platform_device *dell_smm_device;
/*
* Probe for the presence of a supported laptop.
*/
static int __init i8k_init(void)
{
/*
* 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));
}
/*
* 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;
}
dell_smm_device = platform_create_bundle(&dell_smm_driver, dell_smm_probe, NULL, 0, NULL,
0);
return PTR_ERR_OR_ZERO(dell_smm_device);
}
static void __exit i8k_exit(void)
{
platform_device_unregister(dell_smm_device);
platform_driver_unregister(&dell_smm_driver);
}
module_init(i8k_init);
module_exit(i8k_exit);
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