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#include <linuxcomp.h>

#include <linux/pci.h>
#include <linux/module.h>
#include "pci.h"

//#define DEBUG

#ifdef DEBUG
#define DBG(x...) printk(x)
#else
#define DBG(x...)
#endif

static void pci_free_resources(struct pci_dev *dev)
{
        int i;

        for (i = 0; i < PCI_NUM_RESOURCES; i++) {
                struct resource *res = dev->resource + i;
                if (res->parent)
                        release_resource(res);
        }
}

static void pci_destroy_dev(struct pci_dev *dev)
{
        pci_proc_detach_device(dev);
        device_unregister(&dev->dev);

        /* Remove the device from the device lists, and prevent any further
         * list accesses from this device */
        spin_lock(&pci_bus_lock);
        list_del(&dev->bus_list);
        list_del(&dev->global_list);
        dev->bus_list.next = dev->bus_list.prev = NULL;
        dev->global_list.next = dev->global_list.prev = NULL;
        spin_unlock(&pci_bus_lock);

        pci_free_resources(dev);
        pci_dev_put(dev);
}

/**
 * pci_remove_device_safe - remove an unused hotplug device
 * @dev: the device to remove
 *
 * Delete the device structure from the device lists and
 * notify userspace (/sbin/hotplug), but only if the device
 * in question is not being used by a driver.
 * Returns 0 on success.
 */
int pci_remove_device_safe(struct pci_dev *dev)
{
        if (pci_dev_driver(dev))
                return -EBUSY;
        pci_destroy_dev(dev);
        return 0;
}
EXPORT_SYMBOL(pci_remove_device_safe);

/**
 * pci_remove_bus_device - remove a PCI device and any children
 * @dev: the device to remove
 *
 * Remove a PCI device from the device lists, informing the drivers
 * that the device has been removed.  We also remove any subordinate
 * buses and children in a depth-first manner.
 *
 * For each device we remove, delete the device structure from the
 * device lists, remove the /proc entry, and notify userspace
 * (/sbin/hotplug).
 */
void pci_remove_bus_device(struct pci_dev *dev)
{
        if (dev->subordinate) {
                struct pci_bus *b = dev->subordinate;

                pci_remove_behind_bridge(dev);
                pci_proc_detach_bus(b);

                spin_lock(&pci_bus_lock);
                list_del(&b->node);
                spin_unlock(&pci_bus_lock);

                kfree(b);
                dev->subordinate = NULL;
        }

        pci_destroy_dev(dev);
}

/**
 * pci_remove_behind_bridge - remove all devices behind a PCI bridge
 * @dev: PCI bridge device
 *
 * Remove all devices on the bus, except for the parent bridge.
 * This also removes any child buses, and any devices they may
 * contain in a depth-first manner.
 */
void pci_remove_behind_bridge(struct pci_dev *dev)
{
        struct list_head *l, *n;

        if (dev->subordinate) {
                list_for_each_safe(l, n, &dev->subordinate->devices) {
                        struct pci_dev *dev = pci_dev_b(l);

                        pci_remove_bus_device(dev);
                }
        }
}

EXPORT_SYMBOL(pci_remove_bus_device);
EXPORT_SYMBOL(pci_remove_behind_bridge);