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authorLan Tianyu <tianyu.lan@intel.com>2012-09-05 13:44:33 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-09-10 13:02:02 -0700
commitd557542421da643358201664903e67fd01dfca1a (patch)
treed52248ce52d1f5c5f7223c5700f727f1a1a721f4 /drivers/usb/core/hub.c
parentff823c79a5c33194c2e5594f7c4686ea3547910c (diff)
usb/acpi: Bind ACPI node to USB port, not usb_device.
In the ACPI DSDT table, only usb root hub and usb ports are ACPI device nodes. Originally, we bound the usb port's ACPI node to the usb device attached to the port. However, we want to access those ACPI port methods when the port is empty, and there's no usb_device associated with that port. Now that the usb port is a real device, we can bind the port's ACPI node to struct usb_port instead. Signed-off-by: Lan Tianyu <tianyu.lan@intel.com> Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core/hub.c')
-rw-r--r--drivers/usb/core/hub.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index cdbade14899..3341b55f495 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