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521 lines
12 KiB
521 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* toshiba.c -- Linux driver for accessing the SMM on Toshiba laptops |
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* |
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* Copyright (c) 1996-2001 Jonathan A. Buzzard ([email protected]) |
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* |
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* Valuable assistance and patches from: |
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* Tom May <[email protected]> |
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* Rob Napier <[email protected]> |
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* |
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* Fn status port numbers for machine ID's courtesy of |
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* 0xfc02: Scott Eisert <[email protected]> |
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* 0xfc04: Steve VanDevender <[email protected]> |
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* 0xfc08: Garth Berry <[email protected]> |
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* 0xfc0a: Egbert Eich <[email protected]> |
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* 0xfc10: Andrew Lofthouse <[email protected]> |
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* 0xfc11: Spencer Olson <[email protected]> |
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* 0xfc13: Claudius Frankewitz <[email protected]> |
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* 0xfc15: Tom May <[email protected]> |
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* 0xfc17: Dave Konrad <[email protected]> |
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* 0xfc1a: George Betzos <[email protected]> |
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* 0xfc1b: Munemasa Wada <[email protected]> |
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* 0xfc1d: Arthur Liu <[email protected]> |
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* 0xfc5a: Jacques L'helgoualc'h <[email protected]> |
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* 0xfcd1: Mr. Dave Konrad <[email protected]> |
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* |
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* WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING |
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* |
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* This code is covered by the GNU GPL and you are free to make any |
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* changes you wish to it under the terms of the license. However the |
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* code has the potential to render your computer and/or someone else's |
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* unusable. Please proceed with care when modifying the code. |
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* |
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* Note: Unfortunately the laptop hardware can close the System Configuration |
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* Interface on it's own accord. It is therefore necessary for *all* |
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* programs using this driver to be aware that *any* SCI call can fail at |
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* *any* time. It is up to any program to be aware of this eventuality |
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* and take appropriate steps. |
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* |
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* The information used to write this driver has been obtained by reverse |
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* engineering the software supplied by Toshiba for their portable computers in |
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* strict accordance with the European Council Directive 92/250/EEC on the legal |
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* protection of computer programs, and it's implementation into English Law by |
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* the Copyright (Computer Programs) Regulations 1992 (S.I. 1992 No.3233). |
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*/ |
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#define TOSH_VERSION "1.11 26/9/2001" |
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#define TOSH_DEBUG 0 |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/types.h> |
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#include <linux/fcntl.h> |
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#include <linux/miscdevice.h> |
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#include <linux/ioport.h> |
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#include <asm/io.h> |
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#include <linux/uaccess.h> |
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#include <linux/init.h> |
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#include <linux/stat.h> |
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#include <linux/proc_fs.h> |
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#include <linux/seq_file.h> |
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#include <linux/mutex.h> |
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#include <linux/toshiba.h> |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Jonathan Buzzard <[email protected]>"); |
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MODULE_DESCRIPTION("Toshiba laptop SMM driver"); |
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MODULE_SUPPORTED_DEVICE("toshiba"); |
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static DEFINE_MUTEX(tosh_mutex); |
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static int tosh_fn; |
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module_param_named(fn, tosh_fn, int, 0); |
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MODULE_PARM_DESC(fn, "User specified Fn key detection port"); |
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static int tosh_id; |
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static int tosh_bios; |
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static int tosh_date; |
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static int tosh_sci; |
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static int tosh_fan; |
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static long tosh_ioctl(struct file *, unsigned int, |
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unsigned long); |
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static const struct file_operations tosh_fops = { |
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.owner = THIS_MODULE, |
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.unlocked_ioctl = tosh_ioctl, |
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.llseek = noop_llseek, |
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}; |
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static struct miscdevice tosh_device = { |
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TOSH_MINOR_DEV, |
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"toshiba", |
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&tosh_fops |
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}; |
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/* |
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* Read the Fn key status |
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*/ |
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#ifdef CONFIG_PROC_FS |
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static int tosh_fn_status(void) |
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{ |
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unsigned char scan; |
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unsigned long flags; |
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if (tosh_fn!=0) { |
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scan = inb(tosh_fn); |
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} else { |
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local_irq_save(flags); |
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outb(0x8e, 0xe4); |
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scan = inb(0xe5); |
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local_irq_restore(flags); |
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} |
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return (int) scan; |
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} |
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#endif |
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/* |
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* For the Portage 610CT and the Tecra 700CS/700CDT emulate the HCI fan function |
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*/ |
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static int tosh_emulate_fan(SMMRegisters *regs) |
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{ |
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unsigned long eax,ecx,flags; |
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unsigned char al; |
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eax = regs->eax & 0xff00; |
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ecx = regs->ecx & 0xffff; |
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/* Portage 610CT */ |
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if (tosh_id==0xfccb) { |
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if (eax==0xfe00) { |
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/* fan status */ |
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local_irq_save(flags); |
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outb(0xbe, 0xe4); |
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al = inb(0xe5); |
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local_irq_restore(flags); |
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regs->eax = 0x00; |
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regs->ecx = (unsigned int) (al & 0x01); |
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} |
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if ((eax==0xff00) && (ecx==0x0000)) { |
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/* fan off */ |
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local_irq_save(flags); |
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outb(0xbe, 0xe4); |
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al = inb(0xe5); |
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outb(0xbe, 0xe4); |
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outb (al | 0x01, 0xe5); |
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local_irq_restore(flags); |
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regs->eax = 0x00; |
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regs->ecx = 0x00; |
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} |
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if ((eax==0xff00) && (ecx==0x0001)) { |
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/* fan on */ |
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local_irq_save(flags); |
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outb(0xbe, 0xe4); |
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al = inb(0xe5); |
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outb(0xbe, 0xe4); |
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outb(al & 0xfe, 0xe5); |
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local_irq_restore(flags); |
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regs->eax = 0x00; |
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regs->ecx = 0x01; |
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} |
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} |
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/* Tecra 700CS/CDT */ |
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if (tosh_id==0xfccc) { |
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if (eax==0xfe00) { |
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/* fan status */ |
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local_irq_save(flags); |
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outb(0xe0, 0xe4); |
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al = inb(0xe5); |
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local_irq_restore(flags); |
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regs->eax = 0x00; |
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regs->ecx = al & 0x01; |
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} |
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if ((eax==0xff00) && (ecx==0x0000)) { |
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/* fan off */ |
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local_irq_save(flags); |
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outb(0xe0, 0xe4); |
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al = inb(0xe5); |
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outw(0xe0 | ((al & 0xfe) << 8), 0xe4); |
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local_irq_restore(flags); |
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regs->eax = 0x00; |
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regs->ecx = 0x00; |
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} |
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if ((eax==0xff00) && (ecx==0x0001)) { |
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/* fan on */ |
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local_irq_save(flags); |
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outb(0xe0, 0xe4); |
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al = inb(0xe5); |
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outw(0xe0 | ((al | 0x01) << 8), 0xe4); |
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local_irq_restore(flags); |
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regs->eax = 0x00; |
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regs->ecx = 0x01; |
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} |
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} |
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return 0; |
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} |
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/* |
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* Put the laptop into System Management Mode |
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*/ |
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int tosh_smm(SMMRegisters *regs) |
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{ |
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int eax; |
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asm ("# load the values into the registers\n\t" \ |
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"pushl %%eax\n\t" \ |
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"movl 0(%%eax),%%edx\n\t" \ |
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"push %%edx\n\t" \ |
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"movl 4(%%eax),%%ebx\n\t" \ |
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"movl 8(%%eax),%%ecx\n\t" \ |
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"movl 12(%%eax),%%edx\n\t" \ |
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"movl 16(%%eax),%%esi\n\t" \ |
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"movl 20(%%eax),%%edi\n\t" \ |
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"popl %%eax\n\t" \ |
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"# call the System Management mode\n\t" \ |
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"inb $0xb2,%%al\n\t" |
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"# fill out the memory with the values in the registers\n\t" \ |
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"xchgl %%eax,(%%esp)\n\t" |
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"movl %%ebx,4(%%eax)\n\t" \ |
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"movl %%ecx,8(%%eax)\n\t" \ |
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"movl %%edx,12(%%eax)\n\t" \ |
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"movl %%esi,16(%%eax)\n\t" \ |
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"movl %%edi,20(%%eax)\n\t" \ |
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"popl %%edx\n\t" \ |
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"movl %%edx,0(%%eax)\n\t" \ |
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"# setup the return value to the carry flag\n\t" \ |
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"lahf\n\t" \ |
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"shrl $8,%%eax\n\t" \ |
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"andl $1,%%eax\n" \ |
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: "=a" (eax) |
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: "a" (regs) |
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: "%ebx", "%ecx", "%edx", "%esi", "%edi", "memory"); |
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return eax; |
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} |
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EXPORT_SYMBOL(tosh_smm); |
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static long tosh_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) |
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{ |
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SMMRegisters regs; |
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SMMRegisters __user *argp = (SMMRegisters __user *)arg; |
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unsigned short ax,bx; |
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int err; |
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if (!argp) |
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return -EINVAL; |
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if (copy_from_user(®s, argp, sizeof(SMMRegisters))) |
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return -EFAULT; |
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switch (cmd) { |
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case TOSH_SMM: |
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ax = regs.eax & 0xff00; |
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bx = regs.ebx & 0xffff; |
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/* block HCI calls to read/write memory & PCI devices */ |
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if (((ax==0xff00) || (ax==0xfe00)) && (bx>0x0069)) |
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return -EINVAL; |
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/* do we need to emulate the fan ? */ |
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mutex_lock(&tosh_mutex); |
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if (tosh_fan==1) { |
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if (((ax==0xf300) || (ax==0xf400)) && (bx==0x0004)) { |
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err = tosh_emulate_fan(®s); |
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mutex_unlock(&tosh_mutex); |
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break; |
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} |
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} |
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err = tosh_smm(®s); |
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mutex_unlock(&tosh_mutex); |
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break; |
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default: |
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return -EINVAL; |
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} |
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if (copy_to_user(argp, ®s, sizeof(SMMRegisters))) |
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return -EFAULT; |
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return (err==0) ? 0:-EINVAL; |
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} |
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/* |
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* Print the information for /proc/toshiba |
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*/ |
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#ifdef CONFIG_PROC_FS |
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static int proc_toshiba_show(struct seq_file *m, void *v) |
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{ |
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int key; |
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key = tosh_fn_status(); |
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/* Arguments |
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0) Linux driver version (this will change if format changes) |
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1) Machine ID |
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2) SCI version |
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3) BIOS version (major, minor) |
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4) BIOS date (in SCI date format) |
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5) Fn Key status |
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*/ |
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seq_printf(m, "1.1 0x%04x %d.%d %d.%d 0x%04x 0x%02x\n", |
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tosh_id, |
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(tosh_sci & 0xff00)>>8, |
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tosh_sci & 0xff, |
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(tosh_bios & 0xff00)>>8, |
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tosh_bios & 0xff, |
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tosh_date, |
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key); |
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return 0; |
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} |
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#endif |
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/* |
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* Determine which port to use for the Fn key status |
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*/ |
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static void tosh_set_fn_port(void) |
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{ |
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switch (tosh_id) { |
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case 0xfc02: case 0xfc04: case 0xfc09: case 0xfc0a: case 0xfc10: |
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case 0xfc11: case 0xfc13: case 0xfc15: case 0xfc1a: case 0xfc1b: |
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case 0xfc5a: |
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tosh_fn = 0x62; |
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break; |
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case 0xfc08: case 0xfc17: case 0xfc1d: case 0xfcd1: case 0xfce0: |
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case 0xfce2: |
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tosh_fn = 0x68; |
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break; |
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default: |
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tosh_fn = 0x00; |
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break; |
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} |
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return; |
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} |
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/* |
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* Get the machine identification number of the current model |
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*/ |
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static int tosh_get_machine_id(void __iomem *bios) |
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{ |
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int id; |
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SMMRegisters regs; |
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unsigned short bx,cx; |
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unsigned long address; |
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id = (0x100*(int) readb(bios+0xfffe))+((int) readb(bios+0xfffa)); |
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/* do we have a SCTTable machine identication number on our hands */ |
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if (id==0xfc2f) { |
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/* start by getting a pointer into the BIOS */ |
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regs.eax = 0xc000; |
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regs.ebx = 0x0000; |
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regs.ecx = 0x0000; |
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tosh_smm(®s); |
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bx = (unsigned short) (regs.ebx & 0xffff); |
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/* At this point in the Toshiba routines under MS Windows |
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the bx register holds 0xe6f5. However my code is producing |
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a different value! For the time being I will just fudge the |
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value. This has been verified on a Satellite Pro 430CDT, |
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Tecra 750CDT, Tecra 780DVD and Satellite 310CDT. */ |
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#if TOSH_DEBUG |
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pr_debug("toshiba: debugging ID ebx=0x%04x\n", regs.ebx); |
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#endif |
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bx = 0xe6f5; |
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/* now twiddle with our pointer a bit */ |
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address = bx; |
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cx = readw(bios + address); |
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address = 9+bx+cx; |
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cx = readw(bios + address); |
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address = 0xa+cx; |
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cx = readw(bios + address); |
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/* now construct our machine identification number */ |
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id = ((cx & 0xff)<<8)+((cx & 0xff00)>>8); |
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} |
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return id; |
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} |
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/* |
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* Probe for the presence of a Toshiba laptop |
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* |
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* returns and non-zero if unable to detect the presence of a Toshiba |
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* laptop, otherwise zero and determines the Machine ID, BIOS version and |
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* date, and SCI version. |
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*/ |
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static int tosh_probe(void) |
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{ |
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int i,major,minor,day,year,month,flag; |
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unsigned char signature[7] = { 0x54,0x4f,0x53,0x48,0x49,0x42,0x41 }; |
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SMMRegisters regs; |
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void __iomem *bios = ioremap(0xf0000, 0x10000); |
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if (!bios) |
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return -ENOMEM; |
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/* extra sanity check for the string "TOSHIBA" in the BIOS because |
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some machines that are not Toshiba's pass the next test */ |
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for (i=0;i<7;i++) { |
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if (readb(bios+0xe010+i)!=signature[i]) { |
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pr_err("toshiba: not a supported Toshiba laptop\n"); |
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iounmap(bios); |
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return -ENODEV; |
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} |
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} |
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/* call the Toshiba SCI support check routine */ |
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regs.eax = 0xf0f0; |
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regs.ebx = 0x0000; |
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regs.ecx = 0x0000; |
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flag = tosh_smm(®s); |
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/* if this is not a Toshiba laptop carry flag is set and ah=0x86 */ |
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if ((flag==1) || ((regs.eax & 0xff00)==0x8600)) { |
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pr_err("toshiba: not a supported Toshiba laptop\n"); |
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iounmap(bios); |
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return -ENODEV; |
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} |
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/* if we get this far then we are running on a Toshiba (probably)! */ |
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tosh_sci = regs.edx & 0xffff; |
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/* next get the machine ID of the current laptop */ |
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tosh_id = tosh_get_machine_id(bios); |
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/* get the BIOS version */ |
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major = readb(bios+0xe009)-'0'; |
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minor = ((readb(bios+0xe00b)-'0')*10)+(readb(bios+0xe00c)-'0'); |
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tosh_bios = (major*0x100)+minor; |
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/* get the BIOS date */ |
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day = ((readb(bios+0xfff5)-'0')*10)+(readb(bios+0xfff6)-'0'); |
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month = ((readb(bios+0xfff8)-'0')*10)+(readb(bios+0xfff9)-'0'); |
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year = ((readb(bios+0xfffb)-'0')*10)+(readb(bios+0xfffc)-'0'); |
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tosh_date = (((year-90) & 0x1f)<<10) | ((month & 0xf)<<6) |
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| ((day & 0x1f)<<1); |
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/* in theory we should check the ports we are going to use for the |
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fn key detection (and the fan on the Portage 610/Tecra700), and |
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then request them to stop other drivers using them. However as |
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the keyboard driver grabs 0x60-0x6f and the pic driver grabs |
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0xa0-0xbf we can't. We just have to live dangerously and use the |
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ports anyway, oh boy! */ |
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/* do we need to emulate the fan? */ |
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if ((tosh_id==0xfccb) || (tosh_id==0xfccc)) |
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tosh_fan = 1; |
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iounmap(bios); |
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return 0; |
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} |
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static int __init toshiba_init(void) |
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{ |
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int retval; |
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/* are we running on a Toshiba laptop */ |
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if (tosh_probe()) |
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return -ENODEV; |
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pr_info("Toshiba System Management Mode driver v" TOSH_VERSION "\n"); |
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/* set the port to use for Fn status if not specified as a parameter */ |
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if (tosh_fn==0x00) |
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tosh_set_fn_port(); |
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/* register the device file */ |
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retval = misc_register(&tosh_device); |
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if (retval < 0) |
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return retval; |
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#ifdef CONFIG_PROC_FS |
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{ |
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struct proc_dir_entry *pde; |
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pde = proc_create_single("toshiba", 0, NULL, proc_toshiba_show); |
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if (!pde) { |
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misc_deregister(&tosh_device); |
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return -ENOMEM; |
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} |
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} |
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#endif |
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return 0; |
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} |
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static void __exit toshiba_exit(void) |
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{ |
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remove_proc_entry("toshiba", NULL); |
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misc_deregister(&tosh_device); |
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} |
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module_init(toshiba_init); |
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module_exit(toshiba_exit); |
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