1 files changed, 54 insertions, 3 deletions

diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index bc01d34e2634..f94c86fbc669 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -1,9 +1,10 @@
 /*
  * File:        pci-acpi.c
- * Purpose:     Provide PCI supports in ACPI
+ * Purpose:     Provide PCI support in ACPI
  *
- * Copyright (C) 2004 Intel
- * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
+ * Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com>
+ * Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com>
+ * Copyright (C) 2004 Intel Corp.
  */
 
 #include <linux/delay.h>
@@ -207,3 +208,53 @@ acpi_status pci_osc_control_set(u32 flags)
         return status;
 }
 EXPORT_SYMBOL(pci_osc_control_set);
+
+/* ACPI bus type */
+static int pci_acpi_find_device(struct device *dev, acpi_handle *handle)
+{
+        struct pci_dev * pci_dev;
+        acpi_integer    addr;
+
+        pci_dev = to_pci_dev(dev);
+        /* Please ref to ACPI spec for the syntax of _ADR */
+        addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
+        *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
+        if (!*handle)
+                return -ENODEV;
+        return 0;
+}
+
+static int pci_acpi_find_root_bridge(struct device *dev, acpi_handle *handle)
+{
+        int num;
+        unsigned int seg, bus;
+
+        /*
+         * The string should be the same as root bridge's name
+         * Please look at 'pci_scan_bus_parented'
+         */
+        num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus);
+        if (num != 2)
+                return -ENODEV;
+        *handle = acpi_get_pci_rootbridge_handle(seg, bus);
+        if (!*handle)
+                return -ENODEV;
+        return 0;
+}
+
+static struct acpi_bus_type pci_acpi_bus = {
+        .bus = &pci_bus_type,
+        .find_device = pci_acpi_find_device,
+        .find_bridge = pci_acpi_find_root_bridge,
+};
+
+static int __init pci_acpi_init(void)
+{
+        int ret;
+
+        ret = register_acpi_bus_type(&pci_acpi_bus);
+        if (ret)
+                return 0;
+        return 0;
+}
+arch_initcall(pci_acpi_init);