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authorMatthew Garrett <mjg@redhat.com>2012-05-11 12:08:27 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-05-12 04:06:13 +0400
commitda0af6e78ef311d97754aa03e10eade82cc99e16 (patch)
tree52d904e831d619452299844c7f55b61be2d62a53 /drivers/usb/core/usb-acpi.c
parent38ac0f1b90dc9486cc039f1a4d8b0202813e5b67 (diff)
downloadlinux-da0af6e78ef311d97754aa03e10eade82cc99e16.tar.xz
usb: Bind devices to ACPI devices when possible
Built-in USB devices will typically have a representation in the system ACPI tables. Add support for binding the two together so the USB code can make use of the associated methods. Signed-off-by: Matthew Garrett <mjg@redhat.com> Signed-off-by: Lan Tianyu <tianyu.lan@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core/usb-acpi.c')
-rw-r--r--drivers/usb/core/usb-acpi.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/drivers/usb/core/usb-acpi.c b/drivers/usb/core/usb-acpi.c
new file mode 100644
index 000000000000..cab5cb7c256c
--- /dev/null
+++ b/drivers/usb/core/usb-acpi.c
@@ -0,0 +1,60 @@
+/*
+ * USB-ACPI glue code
+ *
+ * Copyright 2012 Red Hat <mjg@redhat.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, version 2.
+ *
+ */
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/acpi.h>
+#include <linux/pci.h>
+#include <acpi/acpi_bus.h>
+
+#include "usb.h"
+
+static int usb_acpi_find_device(struct device *dev, acpi_handle *handle)
+{
+ struct usb_device *udev;
+ struct device *parent;
+ acpi_handle *parent_handle;
+
+ 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)
+ return -ENODEV;
+
+ return 0;
+}
+
+static struct acpi_bus_type usb_acpi_bus = {
+ .bus = &usb_bus_type,
+ .find_bridge = NULL,
+ .find_device = usb_acpi_find_device,
+};
+
+int usb_acpi_register(void)
+{
+ return register_acpi_bus_type(&usb_acpi_bus);
+}
+
+void usb_acpi_unregister(void)
+{
+ unregister_acpi_bus_type(&usb_acpi_bus);
+}