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linux/drivers/hwmon/dell-smm-hwmon.c
Armin Wolf dbd3e6eaf3 hwmon: (dell-smm) Fix warning on /proc/i8k creation error 
The removal function is called regardless of whether
/proc/i8k was created successfully or not, the later
causing a WARN() on module removal.
Fix that by only registering the removal function
if /proc/i8k was created successfully.

Tested on a Inspiron 3505.

Fixes: 039ae58503 ("hwmon: Allow to compile dell-smm-hwmon driver without /proc/i8k")
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Acked-by: Pali Rohár <pali@kernel.org>
Link: https://lore.kernel.org/r/20211112171440.59006-1-W_Armin@gmx.de
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2021-11-14 16:57:16 -08:00

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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/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/string.h>
#include <linux/smp.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
#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
#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];
};
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 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;
long long duration;
int rc;
/* 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;
duration = ktime_us_delta(ktime_get(), calltime);
pr_debug("smm(0x%.4x 0x%.4x) = 0x%.4x (took %7lld usecs)\n", eax, ebx,
(rc ? 0xffff : regs->eax & 0xffff), duration);
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(const struct dell_smm_data *data, int fan)
{
struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
if (data->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(const struct dell_smm_data *data, int fan)
{
struct smm_regs regs = { .eax = I8K_SMM_GET_SPEED, };
if (data->disallow_fan_support)
return -EINVAL;
regs.ebx = fan & 0xff;
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, int fan)
{
struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, };
if (data->disallow_fan_support || data->disallow_fan_type_call)
return -EINVAL;
regs.ebx = fan & 0xff;
return i8k_smm(&regs) ? : regs.eax & 0xff;
}
static int i8k_get_fan_type(struct dell_smm_data *data, int 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, int fan, int speed)
{
struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, };
if (data->disallow_fan_support)
return -EINVAL;
regs.ebx = (fan & 0xff) | (speed << 8);
return i8k_smm(&regs) ? : (regs.eax & 0xffff) * data->i8k_fan_mult;
}
/*
* 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, int 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 & 0xff) | (speed << 8);
return i8k_smm(&regs);
}
static int __init 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 __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 int
i8k_ioctl_unlocked(struct file *fp, struct dell_smm_data *data, unsigned int cmd, unsigned long arg)
{
int val = 0;
int speed, err;
unsigned char buff[16];
int __user *argp = (int __user *)arg;
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];
break;
case I8K_MACHINE_ID:
if (restricted && !capable(CAP_SYS_ADMIN))
return -EPERM;
strscpy_pad(buff, data->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(data, val);
break;
case I8K_GET_FAN:
if (copy_from_user(&val, argp, sizeof(int)))
return -EFAULT;
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 (copy_from_user(&speed, argp + 1, sizeof(int)))
return -EFAULT;
err = i8k_set_fan(data, val, speed);
if (err < 0)
return err;
val = i8k_get_fan_status(data, val);
break;
default:
return -ENOIOCTLCMD;
}
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)
{
struct dell_smm_data *data = PDE_DATA(file_inode(fp));
long ret;
mutex_lock(&data->i8k_mutex);
ret = i8k_ioctl_unlocked(fp, data, cmd, arg);
mutex_unlock(&data->i8k_mutex);
return ret;
}
/*
* 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
/*
* Hwmon interface
*/
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:
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 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];
return 0;
case hwmon_fan_max:
*val = data->fan_nominal_speed[channel][data->i8k_fan_max];
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];
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_hwmon(struct device *dev)
{
struct dell_smm_data *data = dev_get_drvdata(dev);
struct device *dell_smm_hwmon_dev;
int i, state, err;
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;
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;
}
}
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 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 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],
},
{ }
};
static int __init dell_smm_probe(struct platform_device *pdev)
{
struct dell_smm_data *data;
const struct dmi_system_id *id, *fan_control;
int fan, ret;
data = devm_kzalloc(&pdev->dev, sizeof(struct dell_smm_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
mutex_init(&data->i8k_mutex);
data->i8k_fan_mult = I8K_FAN_MULT;
data->i8k_fan_max = I8K_FAN_HIGH;
platform_set_drvdata(pdev, data);
if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) {
dev_warn(&pdev->dev, "broken Dell BIOS detected, disallow fan support\n");
if (!force)
data->disallow_fan_support = true;
}
if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) {
dev_warn(&pdev->dev, "broken Dell BIOS detected, disallow fan type call\n");
if (!force)
data->disallow_fan_type_call = true;
}
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;
}
data->i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */
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");
}
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 < DELL_SMM_NO_FANS; ++fan) {
ret = i8k_get_fan_nominal_speed(data, fan, data->i8k_fan_max);
if (ret < 0)
continue;
if (ret > I8K_FAN_MAX_RPM)
data->i8k_fan_mult = 1;
break;
}
} else {
/* Fan multiplier was specified in module param or in dmi */
data->i8k_fan_mult = fan_mult;
}
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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