path: root/drivers/acpi/bus.c

/*
 *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
 *
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/pm.h>
#include <linux/device.h>
#include <linux/proc_fs.h>
#include <linux/acpi.h>
#include <linux/slab.h>
#include <linux/regulator/machine.h>
#include <linux/workqueue.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#ifdef CONFIG_X86
#include <asm/mpspec.h>
#include <linux/dmi.h>
#endif
#include <linux/acpi_iort.h>
#include <linux/pci.h>
#include <acpi/apei.h>
#include <linux/suspend.h>

#include "internal.h"

#define _COMPONENT		ACPI_BUS_COMPONENT
ACPI_MODULE_NAME("bus");

struct acpi_device *acpi_root;
struct proc_dir_entry *acpi_root_dir;
EXPORT_SYMBOL(acpi_root_dir);

#ifdef CONFIG_X86
#ifdef CONFIG_ACPI_CUSTOM_DSDT
static inline int set_copy_dsdt(const struct dmi_system_id *id)
{
	return 0;
}
#else
static int set_copy_dsdt(const struct dmi_system_id *id)
{
	printk(KERN_NOTICE "%s detected - "
		"force copy of DSDT to local memory\n", id->ident);
	acpi_gbl_copy_dsdt_locally = 1;
	return 0;
}
#endif

static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
	/*
	 * Invoke DSDT corruption work-around on all Toshiba Satellite.
	 * https://bugzilla.kernel.org/show_bug.cgi?id=14679
	 */
	{
	 .callback = set_copy_dsdt,
	 .ident = "TOSHIBA Satellite",
	 .matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
		DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
		},
	},
	{}
};
#endif

/* --------------------------------------------------------------------------
                                Device Management
   -------------------------------------------------------------------------- */

acpi_status acpi_bus_get_status_handle(acpi_handle handle,
				       unsigned long long *sta)
{
	acpi_status status;

	status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
	if (ACPI_SUCCESS(status))
		return AE_OK;

	if (status == AE_NOT_FOUND) {
		*sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
		       ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
		return AE_OK;
	}
	return status;
}
EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);

int acpi_bus_get_status(struct acpi_device *device)
{
	acpi_status status;
	unsigned long long sta;

	if (acpi_device_always_present(device)) {
		acpi_set_device_status(device, ACPI_STA_DEFAULT);
		return 0;
	}

	/* Battery devices must have their deps met before calling _STA */
	if (acpi_device_is_battery(device) && device->dep_unmet) {
		acpi_set_device_status(device, 0);
		return 0;
	}

	status = acpi_bus_get_status_handle(device->handle, &sta);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	acpi_set_device_status(device, sta);

	if (device->status.functional && !device->status.present) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
		       "functional but not present;\n"