3 files changed, 79 insertions, 15 deletions

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index cdbade1..3341b55 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -5077,3 +5077,21 @@ struct usb_device *usb_hub_find_child(struct usb_device *hdev,
 	return hub->ports[port1 - 1]->child;
 }
 EXPORT_SYMBOL_GPL(usb_hub_find_child);
+
+#ifdef CONFIG_ACPI
+/**
+ * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle
+ * @hdev: USB device belonging to the usb hub
+ * @port1: port num of the port
+ *
+ * Return port's acpi handle if successful, NULL if params are
+ * invaild.
+ */
+acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev,
+	int port1)
+{
+	struct usb_hub *hub = hdev_to_hub(hdev);
+
+	return DEVICE_ACPI_HANDLE(&hub->ports[port1 - 1]->dev);
+}
+#endif
diff --git a/drivers/usb/core/usb-acpi.c b/drivers/usb/core/usb-acpi.c
index 8947b20..47197bf 100644
--- a/drivers/usb/core/usb-acpi.c
+++ b/drivers/usb/core/usb-acpi.c
@@ -70,22 +70,59 @@ static int usb_acpi_check_pld(struct usb_device *udev, acpi_handle handle)
 static int usb_acpi_find_device(struct device *dev, acpi_handle *handle)
 {
 	struct usb_device *udev;
-	struct device *parent;
 	acpi_handle *parent_handle;
+	int port_num;
 
-	if (!is_usb_device(dev))
-		return -ENODEV;
-
-	udev = to_usb_device(dev);
-	parent = dev->parent;
-	parent_handle = DEVICE_ACPI_HANDLE(parent);
-
-	if (!parent_handle)
-		return -ENODEV;
-
-	*handle = acpi_get_child(parent_handle, udev->portnum);
-
-	if (!*handle)
+	/*
+	 * In the ACPI DSDT table, only usb root hub and usb ports are
+	 * acpi device nodes. The hierarchy like following.
+	 * Device (EHC1)
+	 *	Device (HUBN)
+	 *		Device (PR01)
+	 *			Device (PR11)
+	 *			Device (PR12)
+	 *			Device (PR13)
+	 *			...
+	 * So all binding process is divided into two parts. binding
+	 * root hub and usb ports.
+	 */
+	if (is_usb_device(dev)) {
+		udev = to_usb_device(dev);
+		if (udev->parent)
+			return -ENODEV;
+		/* root hub's parent is the usb hcd. */
+		parent_handle = DEVICE_ACPI_HANDLE(dev->parent);
+		*handle = acpi_get_child(parent_handle, udev->portnum);
+		if (!*handle)
+			return -ENODEV;
+		return 0;
+	} else if (is_usb_port(dev)) {
+		sscanf(dev_name(dev), "port%d", &port_num);
+		/* Get the struct usb_device point of port's hub */
+		udev = to_usb_device(dev->parent->parent);
+
+		/*
+		 * The root hub ports' parent is the root hub. The non-root-hub
+		 * ports' parent is the parent hub port which the hub is
+		 * connected to.
+		 */
+		if (!udev->parent) {
+			*handle = acpi_get_child(DEVICE_ACPI_HANDLE(&udev->dev),
+				port_num);
+			if (!*handle)
+				return -ENODEV;
+		} else {
+			parent_handle =
+				usb_get_hub_port_acpi_handle(udev->parent,
+				udev->portnum);
+			if (!parent_handle)
+				return -ENODEV;
+
+			*handle = acpi_get_child(parent_handle,	port_num);
+			if (!*handle)
+				return -ENODEV;
+		}
+	} else
 		return -ENODEV;
 
 	/*
@@ -102,7 +139,7 @@ static int usb_acpi_find_device(struct device *dev, acpi_handle *handle)
 
 static struct acpi_bus_type usb_acpi_bus = {
 	.bus = &usb_bus_type,
-	.find_bridge = NULL,
+	.find_bridge = usb_acpi_find_device,
 	.find_device = usb_acpi_find_device,
 };
 
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index acb103c..1633f6e 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -1,4 +1,5 @@
 #include <linux/pm.h>
+#include <linux/acpi.h>
 
 struct dev_state;
 
@@ -115,6 +116,7 @@ extern struct bus_type usb_bus_type;
 extern struct device_type usb_device_type;
 extern struct device_type usb_if_device_type;
 extern struct device_type usb_ep_device_type;
+extern struct device_type usb_port_device_type;
 extern struct usb_device_driver usb_generic_driver;
 
 static inline int is_usb_device(const struct device *dev)
@@ -132,6 +134,11 @@ static inline int is_usb_endpoint(const struct device *dev)
 	return dev->type == &usb_ep_device_type;
 }
 
+static inline int is_usb_port(const struct device *dev)
+{
+	return dev->type == &usb_port_device_type;
+}
+
 /* Do the same for device drivers and interface drivers. */
 
 static inline int is_usb_device_driver(struct device_driver *drv)
@@ -166,6 +173,8 @@ extern void usb_notify_remove_bus(struct usb_bus *ubus);
 #ifdef CONFIG_ACPI
 extern int usb_acpi_register(void);
 extern void usb_acpi_unregister(void);
+extern acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev,
+	int port1);
 #else
 static inline int usb_acpi_register(void) { return 0; };
 static inline void usb_acpi_unregister(void) { };