bus.c

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/*
 *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
 *
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#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>
#ifdef CONFIG_X86
#include <asm/mpspec.h>
#endif
#include <linux/pci.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <acpi/apei.h>
#include <linux/dmi.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);

#define STRUCT_TO_INT(s)    (*((int*)&s))


#ifdef CONFIG_X86
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;
}

static struct dmi_system_id dsdt_dmi_table[] __initdata = {
    /*
     * 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"),
        },
    },
    {}
};
#else
static struct dmi_system_id dsdt_dmi_table[] __initdata = {
    {}
};
#endif

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

int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
{
    acpi_status status = AE_OK;


    if (!device)
        return -EINVAL;

    /* TBD: Support fixed-feature devices */

    status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
    if (ACPI_FAILURE(status) || !*device) {
        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
                  handle));
        return -ENODEV;
    }

    return 0;
}

EXPORT_SYMBOL(acpi_bus_get_device);

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;
}

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

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

    STRUCT_TO_INT(device->status) = (int) sta;

    if (device->status.functional && !device->status.present) {
        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
               "functional but not present;\n",
            device->pnp.bus_id,
            (u32) STRUCT_TO_INT(device->status)));
    }

    ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
              device->pnp.bus_id,
              (u32) STRUCT_TO_INT(device->status)));
    return 0;
}
EXPORT_SYMBOL(acpi_bus_get_status);

void acpi_bus_private_data_handler(acpi_handle handle,
                   void *context)
{
    return;
}
EXPORT_SYMBOL(acpi_bus_private_data_handler);

int acpi_bus_get_private_data(acpi_handle handle, void **data)
{
    acpi_status status = AE_OK;

    if (!*data)
        return -EINVAL;

    status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
    if (ACPI_FAILURE(status) || !*data) {
        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
                handle));
        return -ENODEV;
    }

    return 0;
}
EXPORT_SYMBOL(acpi_bus_get_private_data);

/* --------------------------------------------------------------------------
                                 Power Management
   -------------------------------------------------------------------------- */

static const char *state_string(int state)
{
    switch (state) {
    case ACPI_STATE_D0:
        return "D0";
    case ACPI_STATE_D1:
        return "D1";
    case ACPI_STATE_D2:
        return "D2";
    case ACPI_STATE_D3_HOT:
        return "D3hot";
    case ACPI_STATE_D3_COLD:
        return "D3";
    default:
        return "(unknown)";
    }
}

static int __acpi_bus_get_power(struct acpi_device *device, int *state)
{
    int result = ACPI_STATE_UNKNOWN;

    if (!device || !state)
        return -EINVAL;

    if (!device->flags.power_manageable) {
        /* TBD: Non-recursive algorithm for walking up hierarchy. */
        *state = device->parent ?
            device->parent->power.state : ACPI_STATE_D0;
        goto out;
    }

    /*
     * Get the device's power state either directly (via _PSC) or
     * indirectly (via power resources).
     */
    if (device->power.flags.explicit_get) {
        unsigned long long psc;
        acpi_status status = acpi_evaluate_integer(device->handle,
                               "_PSC", NULL, &psc);
        if (ACPI_FAILURE(status))
            return -ENODEV;

        result = psc;
    }
    /* The test below covers ACPI_STATE_UNKNOWN too. */
    if (result <= ACPI_STATE_D2) {
      ; /* Do nothing. */
    } else if (device->power.flags.power_resources) {
        int error = acpi_power_get_inferred_state(device, &result);
        if (error)
            return error;
    } else if (result == ACPI_STATE_D3_HOT) {
        result = ACPI_STATE_D3;
    }

    /*
     * If we were unsure about the device parent's power state up to this
     * point, the fact that the device is in D0 implies that the parent has
     * to be in D0 too.
     */
    if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN
        && result == ACPI_STATE_D0)
        device->parent->power.state = ACPI_STATE_D0;

    *state = result;

 out:
    ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
              device->pnp.bus_id, state_string(*state)));

    return 0;
}


static int __acpi_bus_set_power(struct acpi_device *device, int state)
{
    int result = 0;
    acpi_status status = AE_OK;
    char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };

    if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
        return -EINVAL;

    /* Make sure this is a valid target state */

    if (state == device->power.state) {
        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
                  state_string(state)));
        return 0;
    }

    if (!device->power.states[state].flags.valid) {
        printk(KERN_WARNING PREFIX "Device does not support %s\n",
               state_string(state));
        return -ENODEV;
    }
    if (device->parent && (state < device->parent->power.state)) {
        printk(KERN_WARNING PREFIX
                  "Cannot set device to a higher-powered"
                  " state than parent\n");
        return -ENODEV;
    }

    /* For D3cold we should execute _PS3, not _PS4. */
    if (state == ACPI_STATE_D3_COLD)
        object_name[3] = '3';

    /*
     * Transition Power
     * ----------------
     * On transitions to a high-powered state we first apply power (via
     * power resources) then evalute _PSx.  Conversly for transitions to
     * a lower-powered state.
     */
    if (state < device->power.state) {
        if (device->power.flags.power_resources) {
            result = acpi_power_transition(device, state);
            if (result)
                goto end;
        }
        if (device->power.states[state].flags.explicit_set) {
            status = acpi_evaluate_object(device->handle,
                              object_name, NULL, NULL);
            if (ACPI_FAILURE(status)) {
                result = -ENODEV;
                goto end;
            }
        }
    } else {
        if (device->power.states[state].flags.explicit_set) {
            status = acpi_evaluate_object(device->handle,
                              object_name, NULL, NULL);
            if (ACPI_FAILURE(status)) {
                result = -ENODEV;
                goto end;
            }
        }
        if (device->power.flags.power_resources) {
            result = acpi_power_transition(device, state);
            if (result)
                goto end;
        }
    }

      end:
    if (result)
        printk(KERN_WARNING PREFIX
                  "Device [%s] failed to transition to %s\n",
                  device->pnp.bus_id, state_string(state));
    else {
        device->power.state = state;
        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                  "Device [%s] transitioned to %s\n",
                  device->pnp.bus_id, state_string(state)));
    }

    return result;
}


int acpi_bus_set_power(acpi_handle handle, int state)
{
    struct acpi_device *device;
    int result;

    result = acpi_bus_get_device(handle, &device);
    if (result)
        return result;

    if (!device->flags.power_manageable) {
        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                "Device [%s] is not power manageable\n",
                dev_name(&device->dev)));
        return -ENODEV;
    }

    return __acpi_bus_set_power(device, state);
}
EXPORT_SYMBOL(acpi_bus_set_power);


int acpi_bus_init_power(struct acpi_device *device)
{
    int state;
    int result;

    if (!device)
        return -EINVAL;

    device->power.state = ACPI_STATE_UNKNOWN;

    result = __acpi_bus_get_power(device, &state);
    if (result)
        return result;

    if (device->power.flags.power_resources)
        result = acpi_power_on_resources(device, state);

    if (!result)
        device->power.state = state;

    return result;
}


int acpi_bus_update_power(acpi_handle handle, int *state_p)
{
    struct acpi_device *device;
    int state;
    int result;

    result = acpi_bus_get_device(handle, &device);
    if (result)
        return result;

    result = __acpi_bus_get_power(device, &state);
    if (result)
        return result;

    result = __acpi_bus_set_power(device, state);
    if (!result && state_p)
        *state_p = state;

    return result;
}
EXPORT_SYMBOL_GPL(acpi_bus_update_power);


bool acpi_bus_power_manageable(acpi_handle handle)
{
    struct acpi_device *device;
    int result;

    result = acpi_bus_get_device(handle, &device);
    return result ? false : device->flags.power_manageable;
}

EXPORT_SYMBOL(acpi_bus_power_manageable);

bool acpi_bus_can_wakeup(acpi_handle handle)
{
    struct acpi_device *device;
    int result;

    result = acpi_bus_get_device(handle, &device);
    return result ? false : device->wakeup.flags.valid;
}

EXPORT_SYMBOL(acpi_bus_can_wakeup);

static void acpi_print_osc_error(acpi_handle handle,
    struct acpi_osc_context *context, char *error)
{
    struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
    int i;

    if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
        printk(KERN_DEBUG "%s\n", error);
    else {
        printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
        kfree(buffer.pointer);
    }
    printk(KERN_DEBUG"_OSC request data:");
    for (i = 0; i < context->cap.length; i += sizeof(u32))
        printk("%x ", *((u32 *)(context->cap.pointer + i)));
    printk("\n");
}

static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
{
    int i;
    static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
        24, 26, 28, 30, 32, 34};

    if (strlen(str) != 36)
        return AE_BAD_PARAMETER;
    for (i = 0; i < 36; i++) {
        if (i == 8 || i == 13 || i == 18 || i == 23) {
            if (str[i] != '-')
                return AE_BAD_PARAMETER;
        } else if (!isxdigit(str[i]))
            return AE_BAD_PARAMETER;
    }
    for (i = 0; i < 16; i++) {
        uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
        uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
    }
    return AE_OK;
}

acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
{
    acpi_status status;
    struct acpi_object_list input;
    union acpi_object in_params[4];
    union acpi_object *out_obj;
    u8 uuid[16];
    u32 errors;
    struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};

    if (!context)
        return AE_ERROR;
    if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
        return AE_ERROR;
    context->ret.length = ACPI_ALLOCATE_BUFFER;
    context->ret.pointer = NULL;

    /* Setting up input parameters */
    input.count = 4;
    input.pointer = in_params;
    in_params[0].type       = ACPI_TYPE_BUFFER;
    in_params[0].buffer.length  = 16;
    in_params[0].buffer.pointer = uuid;
    in_params[1].type       = ACPI_TYPE_INTEGER;
    in_params[1].integer.value  = context->rev;
    in_params[2].type       = ACPI_TYPE_INTEGER;
    in_params[2].integer.value  = context->cap.length/sizeof(u32);
    in_params[3].type       = ACPI_TYPE_BUFFER;
    in_params[3].buffer.length  = context->cap.length;
    in_params[3].buffer.pointer     = context->cap.pointer;

    status = acpi_evaluate_object(handle, "_OSC", &input, &output);
    if (ACPI_FAILURE(status))
        return status;

    if (!output.length)
        return AE_NULL_OBJECT;

    out_obj = output.pointer;
    if (out_obj->type != ACPI_TYPE_BUFFER
        || out_obj->buffer.length != context->cap.length) {
        acpi_print_osc_error(handle, context,
            "_OSC evaluation returned wrong type");
        status = AE_TYPE;
        goto out_kfree;
    }
    /* Need to ignore the bit0 in result code */
    errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
    if (errors) {
        if (errors & OSC_REQUEST_ERROR)
            acpi_print_osc_error(handle, context,
                "_OSC request failed");
        if (errors & OSC_INVALID_UUID_ERROR)
            acpi_print_osc_error(handle, context,
                "_OSC invalid UUID");
        if (errors & OSC_INVALID_REVISION_ERROR)
            acpi_print_osc_error(handle, context,
                "_OSC invalid revision");
        if (errors & OSC_CAPABILITIES_MASK_ERROR) {
            if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
                & OSC_QUERY_ENABLE)
                goto out_success;
            status = AE_SUPPORT;
            goto out_kfree;
        }
        status = AE_ERROR;
        goto out_kfree;
    }
out_success:
    context->ret.length = out_obj->buffer.length;
    context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
    if (!context->ret.pointer) {
        status =  AE_NO_MEMORY;
        goto out_kfree;
    }
    memcpy(context->ret.pointer, out_obj->buffer.pointer,
        context->ret.length);
    status =  AE_OK;

out_kfree:
    kfree(output.pointer);
    if (status != AE_OK)
        context->ret.pointer = NULL;
    return status;
}
EXPORT_SYMBOL(acpi_run_osc);

bool osc_sb_apei_support_acked;
static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
static void acpi_bus_osc_support(void)
{
    u32 capbuf[2];
    struct acpi_osc_context context = {
        .uuid_str = sb_uuid_str,
        .rev = 1,
        .cap.length = 8,
        .cap.pointer = capbuf,
    };
    acpi_handle handle;

    capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
    capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
#if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
            defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
    capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
#endif

#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
    capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
#endif

#ifdef ACPI_HOTPLUG_OST
    capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
#endif

    if (!ghes_disable)
        capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
    if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
        return;
    if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
        u32 *capbuf_ret = context.ret.pointer;
        if (context.ret.length > OSC_SUPPORT_TYPE)
            osc_sb_apei_support_acked =
                capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
        kfree(context.ret.pointer);
    }
    /* do we need to check other returned cap? Sounds no */
}

/* --------------------------------------------------------------------------
                                Event Management
   -------------------------------------------------------------------------- */

#ifdef CONFIG_ACPI_PROC_EVENT
static DEFINE_SPINLOCK(acpi_bus_event_lock);

LIST_HEAD(acpi_bus_event_list);
DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);

extern int event_is_open;

int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
{
    struct acpi_bus_event *event;
    unsigned long flags = 0;

    /* drop event on the floor if no one's listening */
    if (!event_is_open)
        return 0;

    event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
    if (!event)
        return -ENOMEM;

    strcpy(event->device_class, device_class);
    strcpy(event->bus_id, bus_id);
    event->type = type;
    event->data = data;

    spin_lock_irqsave(&acpi_bus_event_lock, flags);
    list_add_tail(&event->node, &acpi_bus_event_list);
    spin_unlock_irqrestore(&acpi_bus_event_lock, flags);

    wake_up_interruptible(&acpi_bus_event_queue);

    return 0;

}

EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);

int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
{
    if (!device)
        return -EINVAL;
    return acpi_bus_generate_proc_event4(device->pnp.device_class,
                         device->pnp.bus_id, type, data);
}

EXPORT_SYMBOL(acpi_bus_generate_proc_event);

int acpi_bus_receive_event(struct acpi_bus_event *event)
{
    unsigned long flags = 0;
    struct acpi_bus_event *entry = NULL;

    DECLARE_WAITQUEUE(wait, current);


    if (!event)
        return -EINVAL;

    if (list_empty(&acpi_bus_event_list)) {

        set_current_state(TASK_INTERRUPTIBLE);
        add_wait_queue(&acpi_bus_event_queue, &wait);

        if (list_empty(&acpi_bus_event_list))
            schedule();

        remove_wait_queue(&acpi_bus_event_queue, &wait);
        set_current_state(TASK_RUNNING);

        if (signal_pending(current))
            return -ERESTARTSYS;
    }

    spin_lock_irqsave(&acpi_bus_event_lock, flags);
    if (!list_empty(&acpi_bus_event_list)) {
        entry = list_entry(acpi_bus_event_list.next,
                   struct acpi_bus_event, node);
        list_del(&entry->node);
    }
    spin_unlock_irqrestore(&acpi_bus_event_lock, flags);

    if (!entry)
        return -ENODEV;

    memcpy(event, entry, sizeof(struct acpi_bus_event));

    kfree(entry);

    return 0;
}

#endif  /* CONFIG_ACPI_PROC_EVENT */

/* --------------------------------------------------------------------------
                             Notification Handling
   -------------------------------------------------------------------------- */

static void acpi_bus_check_device(acpi_handle handle)
{
    struct acpi_device *device;
    acpi_status status;
    struct acpi_device_status old_status;

    if (acpi_bus_get_device(handle, &device))
        return;
    if (!device)
        return;

    old_status = device->status;

    /*
     * Make sure this device's parent is present before we go about
     * messing with the device.
     */
    if (device->parent && !device->parent->status.present) {
        device->status = device->parent->status;
        return;
    }

    status = acpi_bus_get_status(device);
    if (ACPI_FAILURE(status))
        return;

    if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
        return;

    /*
     * Device Insertion/Removal
     */
    if ((device->status.present) && !(old_status.present)) {
        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
        /* TBD: Handle device insertion */
    } else if (!(device->status.present) && (old_status.present)) {
        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
        /* TBD: Handle device removal */
    }
}

static void acpi_bus_check_scope(acpi_handle handle)
{
    /* Status Change? */
    acpi_bus_check_device(handle);

    /*
     * TBD: Enumerate child devices within this device's scope and
     *       run acpi_bus_check_device()'s on them.
     */
}

static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
int register_acpi_bus_notifier(struct notifier_block *nb)
{
    return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
}
EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);

void unregister_acpi_bus_notifier(struct notifier_block *nb)
{
    blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
}
EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);

static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
{
    struct acpi_device *device = NULL;
    struct acpi_driver *driver;

    ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
              type, handle));

    blocking_notifier_call_chain(&acpi_bus_notify_list,
        type, (void *)handle);

    switch (type) {

    case ACPI_NOTIFY_BUS_CHECK:
        acpi_bus_check_scope(handle);
        /*
         * TBD: We'll need to outsource certain events to non-ACPI
         *      drivers via the device manager (device.c).
         */
        break;

    case ACPI_NOTIFY_DEVICE_CHECK:
        acpi_bus_check_device(handle);
        /*
         * TBD: We'll need to outsource certain events to non-ACPI
         *      drivers via the device manager (device.c).
         */
        break;

    case ACPI_NOTIFY_DEVICE_WAKE:
        /* TBD */
        break;

    case ACPI_NOTIFY_EJECT_REQUEST:
        /* TBD */
        break;

    case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
        /* TBD: Exactly what does 'light' mean? */
        break;

    case ACPI_NOTIFY_FREQUENCY_MISMATCH:
        /* TBD */
        break;

    case ACPI_NOTIFY_BUS_MODE_MISMATCH:
        /* TBD */
        break;

    case ACPI_NOTIFY_POWER_FAULT:
        /* TBD */
        break;

    default:
        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                  "Received unknown/unsupported notification [%08x]\n",
                  type));
        break;
    }

    acpi_bus_get_device(handle, &device);
    if (device) {
        driver = device->driver;
        if (driver && driver->ops.notify &&
            (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
            driver->ops.notify(device, type);
    }
}

/* --------------------------------------------------------------------------
                             Initialization/Cleanup
   -------------------------------------------------------------------------- */

static int __init acpi_bus_init_irq(void)
{
    acpi_status status = AE_OK;
    union acpi_object arg = { ACPI_TYPE_INTEGER };
    struct acpi_object_list arg_list = { 1, &arg };
    char *message = NULL;


    /*
     * Let the system know what interrupt model we are using by
     * evaluating the \_PIC object, if exists.
     */

    switch (acpi_irq_model) {
    case ACPI_IRQ_MODEL_PIC:
        message = "PIC";
        break;
    case ACPI_IRQ_MODEL_IOAPIC:
        message = "IOAPIC";
        break;
    case ACPI_IRQ_MODEL_IOSAPIC:
        message = "IOSAPIC";
        break;
    case ACPI_IRQ_MODEL_PLATFORM:
        message = "platform specific model";
        break;
    default:
        printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
        return -ENODEV;
    }

    printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);

    arg.integer.value = acpi_irq_model;

    status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
    if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
        ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
        return -ENODEV;
    }

    return 0;
}

u8 acpi_gbl_permanent_mmap;


void __init acpi_early_init(void)
{
    acpi_status status = AE_OK;

    if (acpi_disabled)
        return;

    printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);

    /* enable workarounds, unless strict ACPI spec. compliance */
    if (!acpi_strict)
        acpi_gbl_enable_interpreter_slack = TRUE;

    acpi_gbl_permanent_mmap = 1;

    /*
     * If the machine falls into the DMI check table,
     * DSDT will be copied to memory
     */
    dmi_check_system(dsdt_dmi_table);

    status = acpi_reallocate_root_table();
    if (ACPI_FAILURE(status)) {
        printk(KERN_ERR PREFIX
               "Unable to reallocate ACPI tables\n");
        goto error0;
    }

    status = acpi_initialize_subsystem();
    if (ACPI_FAILURE(status)) {
        printk(KERN_ERR PREFIX
               "Unable to initialize the ACPI Interpreter\n");
        goto error0;
    }

    status = acpi_load_tables();
    if (ACPI_FAILURE(status)) {
        printk(KERN_ERR PREFIX
               "Unable to load the System Description Tables\n");
        goto error0;
    }

#ifdef CONFIG_X86
    if (!acpi_ioapic) {
        /* compatible (0) means level (3) */
        if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
            acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
            acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
        }
        /* Set PIC-mode SCI trigger type */
        acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
                     (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
    } else {
        /*
         * now that acpi_gbl_FADT is initialized,
         * update it with result from INT_SRC_OVR parsing
         */
        acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
    }
#endif

    status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
    if (ACPI_FAILURE(status)) {
        printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
        goto error0;
    }

    return;

      error0:
    disable_acpi();
    return;
}

static int __init acpi_bus_init(void)
{
    int result = 0;
    acpi_status status = AE_OK;
    extern acpi_status acpi_os_initialize1(void);

    acpi_os_initialize1();

    status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
    if (ACPI_FAILURE(status)) {
        printk(KERN_ERR PREFIX
               "Unable to start the ACPI Interpreter\n");
        goto error1;
    }

    /*
     * ACPI 2.0 requires the EC driver to be loaded and work before
     * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
     * is called).
     *
     * This is accomplished by looking for the ECDT table, and getting
     * the EC parameters out of that.
     */
    status = acpi_ec_ecdt_probe();
    /* Ignore result. Not having an ECDT is not fatal. */

    status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
    if (ACPI_FAILURE(status)) {
        printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
        goto error1;
    }

    /*
     * _OSC method may exist in module level code,
     * so it must be run after ACPI_FULL_INITIALIZATION
     */
    acpi_bus_osc_support();

    /*
     * _PDC control method may load dynamic SSDT tables,
     * and we need to install the table handler before that.
     */
    acpi_sysfs_init();

    acpi_early_processor_set_pdc();

    /*
     * Maybe EC region is required at bus_scan/acpi_get_devices. So it
     * is necessary to enable it as early as possible.
     */
    acpi_boot_ec_enable();

    printk(KERN_INFO PREFIX "Interpreter enabled\n");

    /* Initialize sleep structures */
    acpi_sleep_init();

    /*
     * Get the system interrupt model and evaluate \_PIC.
     */
    result = acpi_bus_init_irq();
    if (result)
        goto error1;

    /*
     * Register the for all standard device notifications.
     */
    status =
        acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
                    &acpi_bus_notify, NULL);
    if (ACPI_FAILURE(status)) {
        printk(KERN_ERR PREFIX
               "Unable to register for device notifications\n");
        goto error1;
    }

    /*
     * Create the top ACPI proc directory
     */
    acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);

    return 0;

    /* Mimic structured exception handling */
      error1:
    acpi_terminate();
    return -ENODEV;
}

struct kobject *acpi_kobj;
EXPORT_SYMBOL_GPL(acpi_kobj);

static int __init acpi_init(void)
{
    int result;

    if (acpi_disabled) {
        printk(KERN_INFO PREFIX "Interpreter disabled.\n");
        return -ENODEV;
    }

    acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
    if (!acpi_kobj) {
        printk(KERN_WARNING "%s: kset create error\n", __func__);
        acpi_kobj = NULL;
    }

    init_acpi_device_notify();
    result = acpi_bus_init();
    if (result) {
        disable_acpi();
        return result;
    }

    pci_mmcfg_late_init();
    acpi_scan_init();
    acpi_ec_init();
    acpi_debugfs_init();
    acpi_sleep_proc_init();
    acpi_wakeup_device_init();
    return 0;
}

subsys_initcall(acpi_init);