static struct acpi_device *usb_acpi_find_companion(struct device *dev)
{
	int port1;
	struct usb_device *udev;
	acpi_handle *parent_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);
		port1 = udev->portnum;
		if (udev->parent) {
			struct usb_hub *hub;

			hub = usb_hub_to_struct_hub(udev->parent);
			/*
			 * According usb port's connect type to set usb device's
			 * removability.
			 */
			switch (hub->ports[port1 - 1]->connect_type) {
			case USB_PORT_CONNECT_TYPE_HOT_PLUG:
				udev->removable = USB_DEVICE_REMOVABLE;
				break;
			case USB_PORT_CONNECT_TYPE_HARD_WIRED:
				udev->removable = USB_DEVICE_FIXED;
				break;
			default:
				udev->removable = USB_DEVICE_REMOVABLE_UNKNOWN;
				break;
			}

			return NULL;
		}

		/* root hub's parent is the usb hcd. */
		return acpi_find_child_device(ACPI_COMPANION(dev->parent),
				port1, false);
	} else if (is_usb_port(dev)) {
		struct usb_port *port_dev = to_usb_port(dev);
		struct acpi_device *adev = NULL;

		/* Get the struct usb_device point of port's hub */
		udev = to_usb_device(dev->parent->parent);
		port1 = port_dev->portnum;

		/*
		 * 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) {
			struct usb_hcd *hcd = bus_to_hcd(udev->bus);
			int raw;

			raw = usb_hcd_find_raw_port_number(hcd, port1);
			adev = acpi_find_child_device(ACPI_COMPANION(&udev->dev),
					raw, false);
			if (!adev)
				return NULL;
		} else {
			parent_handle =
				usb_get_hub_port_acpi_handle(udev->parent,
				udev->portnum);
			if (!parent_handle)
				return NULL;

			acpi_bus_get_device(parent_handle, &adev);
			adev = acpi_find_child_device(adev, port1, false);
			if (!adev)
				return NULL;
		}
		usb_acpi_check_port_connect_type(udev, adev->handle, port1);
		return adev;
	}

	return NULL;
}
static bool usb_acpi_bus_match(struct device *dev)
{
	return is_usb_device(dev) || is_usb_port(dev);
}
Exemple #3
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static int usb_acpi_find_device(struct device *dev, acpi_handle *handle)
{
	struct usb_device *udev;
	acpi_handle *parent_handle;
	int port_num;

	/*
	 * 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) {
			enum usb_port_connect_type type;

			/*
			 * According usb port's connect type to set usb device's
			 * removability.
			 */
			type = usb_get_hub_port_connect_type(udev->parent,
				udev->portnum);
			switch (type) {
			case USB_PORT_CONNECT_TYPE_HOT_PLUG:
				udev->removable = USB_DEVICE_REMOVABLE;
				break;
			case USB_PORT_CONNECT_TYPE_HARD_WIRED:
				udev->removable = USB_DEVICE_FIXED;
				break;
			default:
				udev->removable = USB_DEVICE_REMOVABLE_UNKNOWN;
				break;
			}

			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;
		}
		usb_acpi_check_port_connect_type(udev, *handle, port_num);
	} else
		return -ENODEV;

	return 0;
}