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Message-Id: <1427538255-10860-2-git-send-email-pali.rohar@gmail.com>
Date: Sat, 28 Mar 2015 11:24:14 +0100
From: Pali Rohár <pali.rohar@...il.com>
To: Guenter Roeck <linux@...ck-us.net>, Arnd Bergmann <arnd@...db.de>,
"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
Jean Delvare <jdelvare@...e.de>
Cc: Steven Honeyman <stevenhoneyman@...il.com>,
Valdis.Kletnieks@...edu,
Jochen Eisinger <jochen@...guin-breeder.org>,
Gabriele Mazzotta <gabriele.mzt@...il.com>,
linux-kernel@...r.kernel.org, lm-sensors@...sensors.org,
Pali Rohár <pali.rohar@...il.com>
Subject: [PATCH 1/2] hwmon: Rename i8k driver to dell-smm-hwmon and move it to hwmon tree
This commit moves i8k driver to hwmon tree under name dell-smm-hwmon which is
better name then abbreviation i8k. For backward compatibility is added macro
MODULE_ALIAS("i8k") so modprobe will load driver also old name i8k. CONFIG_I8K
compile option was not changed.
This commit also adds me as maintainer of this new dell-smm-hwmon driver.
Signed-off-by: Pali Rohár <pali.rohar@...il.com>
---
MAINTAINERS | 3 +-
drivers/char/Makefile | 1 -
drivers/char/i8k.c | 1005 ---------------------------------------
drivers/hwmon/Makefile | 1 +
drivers/hwmon/dell-smm-hwmon.c | 1007 ++++++++++++++++++++++++++++++++++++++++
5 files changed, 1010 insertions(+), 1007 deletions(-)
delete mode 100644 drivers/char/i8k.c
create mode 100644 drivers/hwmon/dell-smm-hwmon.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 88c09ca..bf5bb05 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3064,8 +3064,9 @@ F: drivers/platform/x86/dell-laptop.c
DELL LAPTOP SMM DRIVER
M: Guenter Roeck <linux@...ck-us.net>
+M: Pali Rohár <pali.rohar@...il.com>
S: Maintained
-F: drivers/char/i8k.c
+F: drivers/hwmon/dell-smm-hwmon.c
F: include/uapi/linux/i8k.h
DELL SYSTEMS MANAGEMENT BASE DRIVER (dcdbas)
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index d06cde26..1d9cf00 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -36,7 +36,6 @@ else
obj-$(CONFIG_NVRAM) += nvram.o
endif
obj-$(CONFIG_TOSHIBA) += toshiba.o
-obj-$(CONFIG_I8K) += i8k.o
obj-$(CONFIG_DS1620) += ds1620.o
obj-$(CONFIG_HW_RANDOM) += hw_random/
obj-$(CONFIG_PPDEV) += ppdev.o
diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c
deleted file mode 100644
index 24cc4ed..0000000
--- a/drivers/char/i8k.c
+++ /dev/null
@@ -1,1005 +0,0 @@
-/*
- * i8k.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
- *
- * Copyright (C) 2001 Massimo Dal Zotto <dz@...ian.org>
- *
- * Hwmon integration:
- * Copyright (C) 2011 Jean Delvare <jdelvare@...e.de>
- * Copyright (C) 2013, 2014 Guenter Roeck <linux@...ck-us.net>
- * Copyright (C) 2014 Pali Rohár <pali.rohar@...il.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@...ian.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, ¤t->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(®s);
- 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(®s);
- 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(®s) ? : 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(®s) ? : (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(®s) ? : 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(®s) ? : (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(®s) ? : 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(®s) ? : 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(®s) ? : 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(®s);
- 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);
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 6c94147..1c3e458 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -155,6 +155,7 @@ obj-$(CONFIG_SENSORS_W83L785TS) += w83l785ts.o
obj-$(CONFIG_SENSORS_W83L786NG) += w83l786ng.o
obj-$(CONFIG_SENSORS_WM831X) += wm831x-hwmon.o
obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o
+obj-$(CONFIG_I8K) += dell-smm-hwmon.o
obj-$(CONFIG_PMBUS) += pmbus/
diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
new file mode 100644
index 0000000..2b04e4f
--- /dev/null
+++ b/drivers/hwmon/dell-smm-hwmon.c
@@ -0,0 +1,1007 @@
+/*
+ * dell-smm-hwmon.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
+ *
+ * Copyright (C) 2001 Massimo Dal Zotto <dz@...ian.org>
+ *
+ * Hwmon integration:
+ * Copyright (C) 2011 Jean Delvare <jdelvare@...e.de>
+ * Copyright (C) 2013, 2014 Guenter Roeck <linux@...ck-us.net>
+ * Copyright (C) 2014, 2015 Pali Rohár <pali.rohar@...il.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@...ian.org)");
+MODULE_AUTHOR("Pali Rohár <pali.rohar@...il.com>");
+MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
+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");
+
+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, ¤t->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(®s);
+ 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(®s);
+ 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(®s) ? : 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(®s) ? : (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(®s) ? : 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(®s) ? : (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(®s) ? : 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(®s) ? : 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(®s) ? : 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(®s);
+ 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);
--
1.7.9.5
--
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