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|
/* toshiba.c -- Linux driver for accessing the SMM on Toshiba laptops
*
* Copyright (c) 1996-2001 Jonathan A. Buzzard (jonathan@buzzard.org.uk)
*
* Valuable assistance and patches from:
* Tom May <tom@you-bastards.com>
* Rob Napier <rnapier@employees.org>
*
* Fn status port numbers for machine ID's courtesy of
* 0xfc02: Scott Eisert <scott.e@sky-eye.com>
* 0xfc04: Steve VanDevender <stevev@efn.org>
* 0xfc08: Garth Berry <garth@itsbruce.net>
* 0xfc0a: Egbert Eich <eich@xfree86.org>
* 0xfc10: Andrew Lofthouse <Andrew.Lofthouse@robins.af.mil>
* 0xfc11: Spencer Olson <solson@novell.com>
* 0xfc13: Claudius Frankewitz <kryp@gmx.de>
* 0xfc15: Tom May <tom@you-bastards.com>
* 0xfc17: Dave Konrad <konrad@xenia.it>
* 0xfc1a: George Betzos <betzos@engr.colostate.edu>
* 0xfc1b: Munemasa Wada <munemasa@jnovel.co.jp>
* 0xfc1d: Arthur Liu <armie@slap.mine.nu>
* 0xfc5a: Jacques L'helgoualc'h <lhh@free.fr>
* 0xfcd1: Mr. Dave Konrad <konrad@xenia.it>
*
* WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
*
* This code is covered by the GNU GPL and you are free to make any
* changes you wish to it under the terms of the license. However the
* code has the potential to render your computer and/or someone else's
* unusable. Please proceed with care when modifying the code.
*
* Note: Unfortunately the laptop hardware can close the System Configuration
* Interface on it's own accord. It is therefore necessary for *all*
* programs using this driver to be aware that *any* SCI call can fail at
* *any* time. It is up to any program to be aware of this eventuality
* and take appropriate steps.
*
* 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.
*
* The information used to write this driver has been obtained by reverse
* engineering the software supplied by Toshiba for their portable computers in
* strict accordance with the European Council Directive 92/250/EEC on the legal
* protection of computer programs, and it's implementation into English Law by
* the Copyright (Computer Programs) Regulations 1992 (S.I. 1992 No.3233).
*
*/
#define TOSH_VERSION "1.11 26/9/2001"
#define TOSH_DEBUG 0
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/miscdevice.h>
#include <linux/ioport.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/init.h>
#include <linux/stat.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/toshiba.h>
#define TOSH_MINOR_DEV 181
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jonathan Buzzard <jonathan@buzzard.org.uk>");
MODULE_DESCRIPTION("Toshiba laptop SMM driver");
MODULE_SUPPORTED_DEVICE("toshiba");
static int tosh_fn;
module_param_named(fn, tosh_fn, int, 0);
MODULE_PARM_DESC(fn, "User specified Fn key detection port");
static int tosh_id;
static int tosh_bios;
static int tosh_date;
static int tosh_sci;
static int tosh_fan;
static int tosh_ioctl(struct inode *, struct file *, unsigned int,
unsigned long);
static const struct file_operations tosh_fops = {
.owner = THIS_MODULE,
.ioctl = tosh_ioctl,
};
static struct miscdevice tosh_device = {
TOSH_MINOR_DEV,
"toshiba",
&tosh_fops
};
/*
* Read the Fn key status
*/
#ifdef CONFIG_PROC_FS
static int tosh_fn_status(void)
{
unsigned char scan;
unsigned long flags;
if (tosh_fn!=0) {
scan = inb(tosh_fn);
} else {
local_irq_save(flags);
outb(0x8e, 0xe4);
scan = inb(0xe5);
local_irq_restore(flags);
}
return (int) scan;
}
#endif
/*
* For the Portage 610CT and the Tecra 700CS/700CDT emulate the HCI fan function
*/
static int tosh_emulate_fan(SMMRegisters *regs)
{
unsigned long eax,ecx,flags;
unsigned char al;
eax = regs->eax & 0xff00;
ecx = regs->ecx & 0xffff;
/* Portage 610CT */
if (tosh_id==0xfccb) {
if (eax==0xfe00) {
/* fan status */
local_irq_save(flags);
outb(0xbe, 0xe4);
al = inb(0xe5);
local_irq_restore(flags);
regs->eax = 0x00;
regs->ecx = (unsigned int) (al & 0x01);
}
if ((eax==0xff00) && (ecx==0x0000)) {
/* fan off */
local_irq_save(flags);
outb(0xbe, 0xe4);
al = inb(0xe5);
outb(0xbe, 0xe4);
outb (al | 0x01, 0xe5);
local_irq_restore(flags);
regs->eax = 0x00;
regs->ecx = 0x00;
}
if ((eax==0xff00) && (ecx==0x0001)) {
/* fan on */
local_irq_save(flags);
outb(0xbe, 0xe4);
al = inb(0xe5);
outb(0xbe, 0xe4);
outb(al & 0xfe, 0xe5);
local_irq_restore(flags);
regs->eax = 0x00;
regs->ecx = 0x01;
}
}
/* Tecra 700CS/CDT */
if (tosh_id==0xfccc) {
if (eax==0xfe00) {
/* fan status */
local_irq_save(flags);
outb(0xe0, 0xe4);
al = inb(0xe5);
local_irq_restore(flags);
regs->eax = 0x00;
regs->ecx = al & 0x01;
}
if ((eax==0xff00) && (ecx==0x0000)) {
/* fan off */
local_irq_save(flags);
outb(0xe0, 0xe4);
al = inb(0xe5);
outw(0xe0 | ((al & 0xfe) << 8), 0xe4);
local_irq_restore(flags);
regs->eax = 0x00;
regs->ecx = 0x00;
}
if ((eax==0xff00) && (ecx==0x0001)) {
/* fan on */
local_irq_save(flags);
outb(0xe0, 0xe4);
al = inb(0xe5);
outw(0xe0 | ((al | 0x01) << 8), 0xe4);
local_irq_restore(flags);
regs->eax = 0x00;
regs->ecx = 0x01;
}
}
return 0;
}
/*
* Put the laptop into System Management Mode
*/
int tosh_smm(SMMRegisters *regs)
{
int eax;
asm ("# load the values into the registers\n\t" \
"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" \
"# call the System Management mode\n\t" \
"inb $0xb2,%%al\n\t"
"# fill out the memory with the values in the registers\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" \
"# setup the return value to the carry flag\n\t" \
"lahf\n\t" \
"shrl $8,%%eax\n\t" \
"andl $1,%%eax\n" \
: "=a" (eax)
: "a" (regs)
: "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory");
return eax;
}
EXPORT_SYMBOL(tosh_smm);
static int tosh_ioctl(struct inode *ip, struct file *fp, unsigned int cmd,
unsigned long arg)
{
SMMRegisters regs;
SMMRegisters __user *argp = (SMMRegisters __user *)arg;
unsigned short ax,bx;
int err;
if (!argp)
return -EINVAL;
if (copy_from_user(®s, argp, sizeof(SMMRegisters)))
return -EFAULT;
switch (cmd) {
case TOSH_SMM:
ax = regs.eax & 0xff00;
bx = regs.ebx & 0xffff;
/* block HCI calls to read/write memory & PCI devices */
if (((ax==0xff00) || (ax==0xfe00)) && (bx>0x0069))
return -EINVAL;
/* do we need to emulate the fan ? */
if (tosh_fan==1) <
|