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>
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@ -9,5 +9,6 @@ usbcore-y += config.o file.o buffer.o sysfs.o endpoint.o
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usbcore-y += devio.o notify.o generic.o quirks.o devices.o
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usbcore-$(CONFIG_PCI) += hcd-pci.o
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usbcore-$(CONFIG_ACPI) += usb-acpi.o
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obj-$(CONFIG_USB) += usbcore.o
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@ -0,0 +1,60 @@
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/*
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* USB-ACPI glue code
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*
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* Copyright 2012 Red Hat <mjg@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation, version 2.
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*
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*/
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/acpi.h>
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#include <linux/pci.h>
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#include <acpi/acpi_bus.h>
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#include "usb.h"
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static int usb_acpi_find_device(struct device *dev, acpi_handle *handle)
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{
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struct usb_device *udev;
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struct device *parent;
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acpi_handle *parent_handle;
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if (!is_usb_device(dev))
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return -ENODEV;
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udev = to_usb_device(dev);
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parent = dev->parent;
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parent_handle = DEVICE_ACPI_HANDLE(parent);
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if (!parent_handle)
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return -ENODEV;
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*handle = acpi_get_child(parent_handle, udev->portnum);
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if (!*handle)
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return -ENODEV;
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return 0;
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}
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static struct acpi_bus_type usb_acpi_bus = {
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.bus = &usb_bus_type,
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.find_bridge = NULL,
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.find_device = usb_acpi_find_device,
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};
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int usb_acpi_register(void)
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{
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return register_acpi_bus_type(&usb_acpi_bus);
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}
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void usb_acpi_unregister(void)
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{
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unregister_acpi_bus_type(&usb_acpi_bus);
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}
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@ -1015,6 +1015,9 @@ static int __init usb_init(void)
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if (retval)
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goto out;
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retval = usb_acpi_register();
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if (retval)
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goto acpi_register_failed;
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retval = bus_register(&usb_bus_type);
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if (retval)
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goto bus_register_failed;
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@ -1049,6 +1052,8 @@ major_init_failed:
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bus_notifier_failed:
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bus_unregister(&usb_bus_type);
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bus_register_failed:
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usb_acpi_unregister();
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acpi_register_failed:
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usb_debugfs_cleanup();
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out:
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return retval;
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@ -1070,6 +1075,7 @@ static void __exit usb_exit(void)
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usb_hub_cleanup();
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bus_unregister_notifier(&usb_bus_type, &usb_bus_nb);
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bus_unregister(&usb_bus_type);
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usb_acpi_unregister();
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usb_debugfs_cleanup();
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}
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@ -156,3 +156,10 @@ extern void usb_notify_remove_device(struct usb_device *udev);
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extern void usb_notify_add_bus(struct usb_bus *ubus);
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extern void usb_notify_remove_bus(struct usb_bus *ubus);
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#ifdef CONFIG_ACPI
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extern int usb_acpi_register(void);
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extern void usb_acpi_unregister(void);
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#else
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static inline int usb_acpi_register(void) { return 0; };
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static inline void usb_acpi_unregister(void) { };
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#endif
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