driver.c
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上传日期:2013-04-10
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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] != ' ')
- {
- 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, exitingn");
- return -ENODEV;
- }
- if (acpi_disabled) {
- printk(KERN_NOTICE "ACPI: disabled by cmdline, exitingn");
- return -ENODEV;
- }
- if (!ACPI_SUCCESS(acpi_initialize_subsystem())) {
- printk(KERN_ERR "ACPI: Driver initialization failedn");
- 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 failedn");
- 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 FADTn");
- acpi_terminate();
- return -ENODEV;
- }
- if (acpi_blacklisted(&acpi_fadt)) {
- printk(KERN_ERR "ACPI: On blacklist -- BIOS not fully ACPI compliantn");
- 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 infon");
- 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 failedn");
- acpi_terminate();
- return -ENODEV;
- }
- printk(KERN_INFO "ACPI: Subsystem enabledn");
- pm_active = 1;
- return 0;
- }
- /*
- * Terminate the interpreter
- */
- void
- acpi_exit(void)
- {
- acpi_terminate();
- pm_active = 0;
- printk(KERN_ERR "ACPI: Subsystem disabledn");
- }
- 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