pci_bind.c

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/*
 *  pci_bind.c - ACPI PCI Device Binding ($Revision: 2 $)
 *
 *  Copyright (C) 2001, 2002 Andy Grover <[email protected]>
 *  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/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/pci-acpi.h>
#include <linux/acpi.h>
#include <linux/pm_runtime.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define _COMPONENT      ACPI_PCI_COMPONENT
ACPI_MODULE_NAME("pci_bind");

static int acpi_pci_unbind(struct acpi_device *device)
{
    struct pci_dev *dev;

    dev = acpi_get_pci_dev(device->handle);
    if (!dev)
        goto out;

    device_set_run_wake(&dev->dev, false);
    pci_acpi_remove_pm_notifier(device);

    if (!dev->subordinate)
        goto out;

    acpi_pci_irq_del_prt(dev->subordinate);

    device->ops.bind = NULL;
    device->ops.unbind = NULL;

out:
    pci_dev_put(dev);
    return 0;
}

static int acpi_pci_bind(struct acpi_device *device)
{
    acpi_status status;
    acpi_handle handle;
    struct pci_bus *bus;
    struct pci_dev *dev;

    dev = acpi_get_pci_dev(device->handle);
    if (!dev)
        return 0;

    pci_acpi_add_pm_notifier(device, dev);
    if (device->wakeup.flags.run_wake)
        device_set_run_wake(&dev->dev, true);

    /*
     * Install the 'bind' function to facilitate callbacks for
     * children of the P2P bridge.
     */
    if (dev->subordinate) {
        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                  "Device %04x:%02x:%02x.%d is a PCI bridge\n",
                  pci_domain_nr(dev->bus), dev->bus->number,
                  PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)));
        device->ops.bind = acpi_pci_bind;
        device->ops.unbind = acpi_pci_unbind;
    }

    /*
     * Evaluate and parse _PRT, if exists.  This code allows parsing of
     * _PRT objects within the scope of non-bridge devices.  Note that
     * _PRTs within the scope of a PCI bridge assume the bridge's
     * subordinate bus number.
     *
     * TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
     */
    status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
    if (ACPI_FAILURE(status))
        goto out;

    if (dev->subordinate)
        bus = dev->subordinate;
    else
        bus = dev->bus;

    acpi_pci_irq_add_prt(device->handle, bus);

out:
    pci_dev_put(dev);
    return 0;
}

int acpi_pci_bind_root(struct acpi_device *device)
{
    device->ops.bind = acpi_pci_bind;
    device->ops.unbind = acpi_pci_unbind;

    return 0;
}