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/*
* driver.c - ACPI driver
*
* Copyright (C) 2000 Andrew Henroid
* Copyright (C) 2001 Andrew Grover
*
* 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 of the License, 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Changes
* David Woodhouse <dwmw2@redhat.com> 2000-12-6
* - Fix interruptible_sleep_on() races
* Andrew Grover <andrew.grover@intel.com> 2001-2-28
* - Major revamping
* Peter Breuer <ptb@it.uc3m.es> 2001-5-20
* - parse boot time params.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/sysctl.h>
#include <linux/pm.h>
#include <linux/acpi.h>
#include <asm/uaccess.h>
#include "acpi.h"
#define _COMPONENT OS_DEPENDENT
MODULE_NAME ("driver")
FADT_DESCRIPTOR acpi_fadt;
static int acpi_disabled = 0;
enum acpi_blacklist_predicates
{
all_versions,
less_than_or_equal,
equal,
greater_than_or_equal,
};
struct acpi_blacklist_item
{
char oem_id[7];
char oem_table_id[9];
u32 oem_revision;
enum acpi_blacklist_predicates oem_revision_predicate;
};
/*
* Currently, this blacklists based on items in the FADT. We may want to
* expand this to using other ACPI tables in the future, too.
*/
static struct acpi_blacklist_item acpi_blacklist[] __initdata =
{
{"TOSHIB", "750 ", 0x970814, less_than_or_equal}, /* Portege 7020, BIOS 8.10 */
{""}
};
int
acpi_blacklisted(FADT_DESCRIPTOR *fadt)
{
int i = 0;
while (acpi_blacklist[i].oem_id[0] != '\0')
{
if (strncmp(acpi_blacklist[i].oem_id, fadt->header.oem_id, 6)) {
i++;
continue;
}
if (strncmp(acpi_blacklist[i].oem_table_id, fadt->header.oem_table_id, 8)) {
i++;
continue;
}
if (acpi_blacklist[i].oem_revision_predicate == all_versions)
return TRUE;
if (acpi_blacklist[i].oem_revision_predicate == less_than_or_equal
&& fadt->header.oem_revision <= acpi_blacklist[i].oem_revision)
return TRUE;
if (acpi_blacklist[i].oem_revision_predicate == greater_than_or_equal
&& fadt->header.oem_revision >= acpi_blacklist[i].oem_revision)
return TRUE;
if (acpi_blacklist[i].oem_revision_predicate == equal
&& fadt->header.oem_revision == acpi_blacklist[i].oem_revision)
return TRUE;
i++;
}
return FALSE;
}
/*
* Start the interpreter
*/
int
acpi_init(void)
{
acpi_buffer buffer;
acpi_system_info sys_info;
if (PM_IS_ACTIVE()) {
printk(KERN_NOTICE "ACPI: APM is already active, exiting\n");
return -ENODEV;
}
if (acpi_disabled) {
printk(KERN_NOTICE "ACPI: disabled by cmdline, exiting\n");
return -ENODEV;
}
if (!ACPI_SUCCESS(acpi_initialize_subsystem())) {
printk(KERN_ERR "ACPI: Driver initialization failed\n");
return -ENODEV;
}
/* from this point on, on error we must call acpi_terminate() */
if (!ACPI_SUCCESS(acpi_load_tables())) {
printk(KERN_ERR "ACPI: System description table load failed\n");
acpi_terminate();
return -ENODEV;
}
/* get a separate copy of the FADT for use by other drivers */
memset(&acpi_fadt, 0, sizeof(acpi_fadt));
buffer.pointer = &acpi_fadt;
buffer.length = sizeof(acpi_fadt);
if (!ACPI_SUCCESS(acpi_get_table(ACPI_TABLE_FADT, 1, &buffer))) {
printk(KERN_ERR "ACPI: Could not get FADT\n");
acpi_terminate();
return -ENODEV;
}
if (acpi_blacklisted(&acpi_fadt)) {
printk(KERN_ERR "ACPI: On blacklist -- BIOS not fully ACPI compliant\n");
acpi_terminate();
return -ENODEV;
}
buffer.length = sizeof(sys_info);
buffer.pointer = &sys_info;
if (!ACPI_SUCCESS (acpi_get_system_info(&buffer))) {
printk(KERN_ERR "ACPI: Could not get system info\n");
acpi_terminate();
return -ENODEV;
}
printk(KERN_INFO "ACPI: Core Subsystem version [%x]\n", sys_info.acpi_ca_version);
if (!ACPI_SUCCESS(acpi_enable_subsystem(ACPI_FULL_INITIALIZATION))) {
printk(KERN_ERR "ACPI: Subsystem enable failed\n");
acpi_terminate();
return -ENODEV;
}
printk(KERN_INFO "ACPI: Subsystem enabled\n");
pm_active = 1;
return 0;
}
/*
* Terminate the interpreter
*/
void
acpi_exit(void)
{
acpi_terminate();
pm_active = 0;
printk(KERN_ERR "ACPI: Subsystem disabled\n");
}
module_init(acpi_init);
module_exit(acpi_exit);
#ifndef MODULE
static int __init acpi_setup(char *str) {
while (str && *str) {
if (strncmp(str, "off", 3) == 0)
acpi_disabled = 1;
str = strchr(str, ',');
if (str)
str += strspn(str, ", \t");
}
return 1;
}
__setup("acpi=", acpi_setup);
#endif
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