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linux/drivers/char/i8k.c
Pali Rohár f989e55452 i8k: Add support for fan labels 
This patch adds labels support for fans if SMM function with EAX register
0x03a3 reports it. This information was taken from DOS binary NBSVC.MDM.

Additionally this patch change detection of fan presece. Instead reading fan
status now detection is based on new label SMM function. Dell DOS binary
NBSVC.MDM is doing similar checks, so we should do that too.

This patch also remove I8K_FAN_LEFT and I8K_FAN_RIGHT usage from hwmon driver
part because that names does not make sense anymore. So numeric constants are
used instead. Original /proc/i8k ioctl part was not changed for compatibility
reasons.

Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-01-25 09:17:59 -08:00

1006 lines
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/*
* i8k.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 Pali Rohár <pali.rohar@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#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/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 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;
#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_FAN1 (1 << 4)
#define I8K_HWMON_HAVE_FAN2 (1 << 5)
MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
MODULE_LICENSE("GPL");
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");
static bool restricted;
module_param(restricted, bool, 0);
MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
static bool power_status;
module_param(power_status, bool, 0600);
MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
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)");
static int i8k_open_fs(struct inode *inode, struct file *file);
static long i8k_ioctl(struct file *, unsigned int, unsigned long);
static const struct file_operations i8k_fops = {
.owner = THIS_MODULE,
.open = i8k_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.unlocked_ioctl = i8k_ioctl,
};
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(struct smm_regs *regs)
{
int rc;
int eax = regs->eax;
cpumask_var_t old_mask;
/* SMM requires CPU 0 */
if (!alloc_cpumask_var(&old_mask, GFP_KERNEL))
return -ENOMEM;
cpumask_copy(old_mask, &current->cpus_allowed);
rc = set_cpus_allowed_ptr(current, cpumask_of(0));
if (rc)
goto out;
if (smp_processor_id() != 0) {
rc = -EBUSY;
goto out;
}
#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;
out:
set_cpus_allowed_ptr(current, old_mask);
free_cpumask_var(old_mask);
return rc;
}
/*
* 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;
}
/*
* Read the fan status.
*/
static int i8k_get_fan_status(int fan)
{
struct smm_regs regs = { .eax = I8K_SMM_GET_FAN, };
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, };
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, };
regs.ebx = fan & 0xff;
return i8k_smm(&regs) ? : regs.eax & 0xff;
}
/*
* 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, };
regs.ebx = (fan & 0xff) | (speed << 8);
return i8k_smm(&regs) ? : (regs.eax & 0xffff) * i8k_fan_mult;
}
/*
* 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, };
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;
}
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:
val = (bios_version[0] << 16) |
(bios_version[1] << 8) | bios_version[2];
break;
case I8K_MACHINE_ID:
memset(buff, 0, 16);
strlcpy(buff, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
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
*/
return seq_printf(seq, "%s %s %s %d %d %d %d %d %d %d\n",
I8K_PROC_FMT,
bios_version,
i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
cpu_temp,
left_fan, right_fan, left_speed, right_speed,
ac_power, fn_key);
}
static int i8k_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, i8k_proc_show, NULL);
}
/*
* Hwmon interface
*/
static ssize_t i8k_hwmon_show_temp_label(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_show_temp(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_show_fan_label(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_show_fan(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_show_pwm(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_set_pwm(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 SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
1);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2);
static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
2);
static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3);
static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
3);
static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 0);
static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
0);
static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
i8k_hwmon_set_pwm, 0);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
1);
static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
1);
static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
i8k_hwmon_set_pwm, 1);
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_fan1_input.dev_attr.attr, /* 8 */
&sensor_dev_attr_fan1_label.dev_attr.attr, /* 9 */
&sensor_dev_attr_pwm1.dev_attr.attr, /* 10 */
&sensor_dev_attr_fan2_input.dev_attr.attr, /* 11 */
&sensor_dev_attr_fan2_label.dev_attr.attr, /* 12 */
&sensor_dev_attr_pwm2.dev_attr.attr, /* 13 */
NULL
};
static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
int index)
{
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 <= 10 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
return 0;
if (index >= 11 && index <= 13 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
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;
/* First fan attributes, if fan type is OK */
err = i8k_get_fan_type(0);
if (err >= 0)
i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
/* Second fan attributes, if fan type is OK */
err = i8k_get_fan_type(1);
if (err >= 0)
i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
i8k_hwmon_dev = hwmon_device_register_with_groups(NULL, "i8k", 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 struct dmi_system_id i8k_dmi_table[] __initdata = {
{
.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],
},
{ }
};
MODULE_DEVICE_TABLE(dmi, i8k_dmi_table);
/*
* Probe for the presence of a supported laptop.
*/
static int __init i8k_probe(void)
{
const struct dmi_system_id *id;
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));
}
strlcpy(bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
sizeof(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;
}
/*
* 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);
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)
{
struct proc_dir_entry *proc_i8k;
int err;
/* Are we running on an supported laptop? */
if (i8k_probe())
return -ENODEV;
/* Register the proc entry */
proc_i8k = proc_create("i8k", 0, NULL, &i8k_fops);
if (!proc_i8k)
return -ENOENT;
err = i8k_init_hwmon();
if (err)
goto exit_remove_proc;
return 0;
exit_remove_proc:
remove_proc_entry("i8k", NULL);
return err;
}
static void __exit i8k_exit(void)
{
hwmon_device_unregister(i8k_hwmon_dev);
remove_proc_entry("i8k", NULL);
}
module_init(i8k_init);
module_exit(i8k_exit);
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