[ACPI] Bind ACPI and PCI devices

http://bugzilla.kernel.org/show_bug.cgi?id=4277

Signed-off-by: David Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

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);