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|
/*
* i8k.c -- Linux driver for accessing the SMM BIOS on Dell laptops.
* See http://www.debian.org/~dz/i8k/ for more information
* and for latest version of this driver.
*
* Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org>
*
* 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.
*/
#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/smp_lock.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/i8k.h>
#define I8K_VERSION "1.14 21/02/2005"
#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_TEMP 0x10a3
#define I8K_SMM_GET_DELL_SIG1 0xfea3
#define I8K_SMM_GET_DELL_SIG2 0xffa3
#define I8K_SMM_BIOS_VERSION 0x00a6
#define I8K_FAN_MULT 30
#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 I8K_TEMPERATURE_BUG 1
static char bios_version[4];
MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
MODULE_LICENSE("GPL");
static int force;
module_param(force, bool, 0);
MODULE_PARM_DESC(force, "Force loading without checking for supported models");
static int ignore_dmi;
module_param(ignore_dmi, bool, 0);
MODULE_PARM_DESC(ignore_dmi, "Continue probing hardware even if DMI data does not match");
static int restricted;
module_param(restricted, bool, 0);
MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
static int power_status;
module_param(power_status, bool, 0600);
MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
static int fan_mult = I8K_FAN_MULT;
module_param(fan_mult, int, 0);
MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with");
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 __attribute__ ((packed));
unsigned int ecx __attribute__ ((packed));
unsigned int edx __attribute__ ((packed));
unsigned int esi __attribute__ ((packed));
unsigned int edi __attribute__ ((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;
#if defined(CONFIG_X86_64)
asm("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"
"lahf\n\t"
"shrl $8,%%eax\n\t"
"andl $1,%%eax\n"
:"=a"(rc)
: "a"(regs)
: "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
#else
asm("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)
return -EINVAL;
return 0;
}
/*
* Read the bios version. Return the version as an integer corresponding
* to the ascii value, for example "A17" is returned as 0x00413137.
*/
static int i8k_get_bios_version(void)
{
struct smm_regs regs = { .eax = I8K_SMM_BIOS_VERSION, };
return i8k_smm(®s) ? : regs.eax;
}
/*
* Read the Fn key status.
*/
static int i8k_get_fn_status(void)
{
struct smm_regs regs = { .eax = I8K_SMM_FN_STATUS, };
int rc;
if ((rc = i8k_smm(®s)) < 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;
if ((rc = i8k_smm(®s)) < 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) * 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) | (
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