fc5462f852
There were previous attempts to "merge" the toshiba SMM module to the toshiba_acpi one, they were trying to imitate what the old toshiba module does, however, some models (TOS1900 devices) come with a "crippled" implementation and do not provide all the "features" a "genuine" Toshiba BIOS does. This patch adds a new device called toshiba_acpi, which aim is to enable userspace to access the SMM on Toshiba laptops via ACPI calls. Creating a new convenience _IOWR command to access the SCI functions by opening/closing the SCI internally to avoid buggy BIOS, while at the same time providing backwards compatibility. Older programs (and new) who wish to access the SMM on newer models can do it by pointing their path to /dev/toshiba_acpi (instead of /dev/toshiba) as the toshiba.h header was modified to reflect these changes as well as adds all the toshiba_acpi paths and command, however, it is strongly recommended to use the new IOCTL for any SCI command to avoid any buggy BIOS. Signed-off-by: Azael Avalos <coproscefalo@gmail.com> Signed-off-by: Darren Hart <dvhart@linux.intel.com>
64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/* toshiba.h -- Linux driver for accessing the SMM on Toshiba laptops
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*
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* Copyright (c) 1996-2000 Jonathan A. Buzzard (jonathan@buzzard.org.uk)
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* Copyright (c) 2015 Azael Avalos <coproscefalo@gmail.com>
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*
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* Thanks to Juergen Heinzl <juergen@monocerus.demon.co.uk> for the pointers
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* on making sure the structure is aligned and packed.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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*/
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#ifndef _UAPI_LINUX_TOSHIBA_H
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#define _UAPI_LINUX_TOSHIBA_H
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/*
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* Toshiba modules paths
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*/
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#define TOSH_PROC "/proc/toshiba"
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#define TOSH_DEVICE "/dev/toshiba"
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#define TOSHIBA_ACPI_PROC "/proc/acpi/toshiba"
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#define TOSHIBA_ACPI_DEVICE "/dev/toshiba_acpi"
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/*
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* Toshiba SMM structure
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*/
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typedef struct {
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unsigned int eax;
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unsigned int ebx __attribute__ ((packed));
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unsigned int ecx __attribute__ ((packed));
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unsigned int edx __attribute__ ((packed));
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unsigned int esi __attribute__ ((packed));
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unsigned int edi __attribute__ ((packed));
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} SMMRegisters;
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/*
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* IOCTLs (0x90 - 0x91)
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*/
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#define TOSH_SMM _IOWR('t', 0x90, SMMRegisters)
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/*
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* Convenience toshiba_acpi command.
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*
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* The System Configuration Interface (SCI) is opened/closed internally
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* to avoid userspace of buggy BIOSes.
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*
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* The toshiba_acpi module checks whether the eax register is set with
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* SCI_GET (0xf300) or SCI_SET (0xf400), returning -EINVAL if not.
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*/
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#define TOSHIBA_ACPI_SCI _IOWR('t', 0x91, SMMRegisters)
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#endif /* _UAPI_LINUX_TOSHIBA_H */
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