3 files changed, 50 insertions, 9 deletions

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index d80dd84e5bfd..6b3b8a522476 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -302,7 +302,7 @@ static void acpi_device_shutdown(struct device *dev)
         return ;
 }
 
-static struct bus_type acpi_bus_type = {
+struct bus_type acpi_bus_type = {
         .name           = "acpi",
         .suspend        = acpi_device_suspend,
         .resume         = acpi_device_resume,
diff --git a/drivers/pnp/pnpacpi/core.c b/drivers/pnp/pnpacpi/core.c
index 62eda5d59024..7eb8275185b6 100644
--- a/drivers/pnp/pnpacpi/core.c
+++ b/drivers/pnp/pnpacpi/core.c
@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2004 Matthieu Castet <castet.matthieu@free.fr>
  * Copyright (c) 2004 Li Shaohua <shaohua.li@intel.com>
- * 
+ *
  * 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, or (at your option) any
@@ -18,7 +18,7 @@
  * 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/acpi.h>
 #include <linux/pnp.h>
 #include <acpi/acpi_bus.h>
@@ -82,7 +82,7 @@ static void __init pnpidacpi_to_pnpid(char *id, char *str)
 static int pnpacpi_get_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
 {
         acpi_status status;
-        status = pnpacpi_parse_allocated_resource((acpi_handle)dev->data, 
+        status = pnpacpi_parse_allocated_resource((acpi_handle)dev->data,
                 &dev->res);
         return ACPI_FAILURE(status) ? -ENODEV : 0;
 }
@@ -112,9 +112,9 @@ static int pnpacpi_set_resources(struct pnp_dev * dev, struct pnp_resource_table
 static int pnpacpi_disable_resources(struct pnp_dev *dev)
 {
         acpi_status status;
-        
+
         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
-        status = acpi_evaluate_object((acpi_handle)dev->data, 
+        status = acpi_evaluate_object((acpi_handle)dev->data,
                 "_DIS", NULL, NULL);
         return ACPI_FAILURE(status) ? -ENODEV : 0;
 }
@@ -167,7 +167,7 @@ static int __init pnpacpi_add_device(struct acpi_device *device)
                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
 
         dev->number = num;
-        
+
         /* set the initial values for the PnP device */
         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
         if (!dev_id)
@@ -185,14 +185,14 @@ static int __init pnpacpi_add_device(struct acpi_device *device)
         }
 
         if(dev->capabilities & PNP_CONFIGURABLE) {
-                status = pnpacpi_parse_resource_option_data(device->handle, 
+                status = pnpacpi_parse_resource_option_data(device->handle,
                         dev);
                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
                         pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s", dev_id->id);
                         goto err1;
                 }
         }
-        
+
         /* parse compatible ids */
         if (device->flags.compatible_ids) {
                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
@@ -236,6 +236,42 @@ static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
         return AE_OK;
 }
 
+static int __init acpi_pnp_match(struct device *dev, void *_pnp)
+{
+        struct acpi_device      *acpi = to_acpi_device(dev);
+        struct pnp_dev          *pnp = _pnp;
+
+        /* true means it matched */
+        return acpi->flags.hardware_id
+                && !acpi_get_physical_device(acpi->handle)
+                && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
+}
+
+static int __init acpi_pnp_find_device(struct device *dev, acpi_handle *handle)
+{
+        struct device           *adev;
+        struct acpi_device      *acpi;
+
+        adev = bus_find_device(&acpi_bus_type, NULL,
+                        to_pnp_dev(dev),
+                        acpi_pnp_match);
+        if (!adev)
+                return -ENODEV;
+
+        acpi = to_acpi_device(adev);
+        *handle = acpi->handle;
+        put_device(adev);
+        return 0;
+}
+
+/* complete initialization of a PNPACPI device includes having
+ * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
+ */
+static struct acpi_bus_type __initdata acpi_pnp_bus = {
+        .bus = &pnp_bus_type,
+        .find_device = acpi_pnp_find_device,
+};
+
 int pnpacpi_disabled __initdata;
 static int __init pnpacpi_init(void)
 {
@@ -245,8 +281,10 @@ static int __init pnpacpi_init(void)
         }
         pnp_info("PnP ACPI init");
         pnp_register_protocol(&pnpacpi_protocol);
+        register_acpi_bus_type(&acpi_pnp_bus);
         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
         pnp_info("PnP ACPI: found %d devices", num);
+        unregister_acpi_bus_type(&acpi_pnp_bus);
         return 0;
 }
 subsys_initcall(pnpacpi_init);
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 16c3c441256e..9cfd5b1a48eb 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -303,6 +303,9 @@ struct acpi_device {
 #define to_acpi_device(d)       container_of(d, struct acpi_device, dev)
 #define to_acpi_driver(d)       container_of(d, struct acpi_driver, drv)
 
+/* acpi_device.dev.bus == &acpi_bus_type */
+extern struct bus_type acpi_bus_type;
+
 /*
  * Events
  * ------