61 lines
1.2 KiB
C
61 lines
1.2 KiB
C
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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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