// SPDX-License-Identifier: GPL-2.0 /* * of.c The helpers for hcd device tree support * * Copyright (C) 2016 Freescale Semiconductor, Inc. * Author: Peter Chen <[email protected]> * Copyright (C) 2017 Johan Hovold <[email protected]> */ #include <linux/of.h> #include <linux/of_graph.h> #include <linux/usb/of.h> /** * usb_of_get_device_node() - get a USB device node * @hub: hub to which device is connected * @port1: one-based index of port * * Look up the node of a USB device given its parent hub device and one-based * port number. * * Return: A pointer to the node with incremented refcount if found, or * %NULL otherwise. */ struct device_node *usb_of_get_device_node(struct usb_device *hub, int port1) { … } EXPORT_SYMBOL_GPL(…); /** * usb_of_has_combined_node() - determine whether a device has a combined node * @udev: USB device * * Determine whether a USB device has a so called combined node which is * shared with its sole interface. This is the case if and only if the device * has a node and its descriptors report the following: * * 1) bDeviceClass is 0 or 9, and * 2) bNumConfigurations is 1, and * 3) bNumInterfaces is 1. * * Return: True iff the device has a device node and its descriptors match the * criteria for a combined node. */ bool usb_of_has_combined_node(struct usb_device *udev) { … } EXPORT_SYMBOL_GPL(…); static bool usb_of_has_devices_or_graph(const struct usb_device *hub) { … } /** * usb_of_get_connect_type() - get a USB hub's port connect_type * @hub: hub to which port is for @port1 * @port1: one-based index of port * * Get the connect_type of @port1 based on the device node for @hub. If the * port is described in the OF graph, the connect_type is "hotplug". If the * @hub has a child device has with a 'reg' property equal to @port1 the * connect_type is "hard-wired". If there isn't an OF graph or child node at * all then the connect_type is "unknown". Otherwise, the port is considered * "unused" because it isn't described at all. * * Return: A connect_type for @port1 based on the device node for @hub. */ enum usb_port_connect_type usb_of_get_connect_type(struct usb_device *hub, int port1) { … } EXPORT_SYMBOL_GPL(…); /** * usb_of_get_interface_node() - get a USB interface node * @udev: USB device of interface * @config: configuration value * @ifnum: interface number * * Look up the node of a USB interface given its USB device, configuration * value and interface number. * * Return: A pointer to the node with incremented refcount if found, or * %NULL otherwise. */ struct device_node * usb_of_get_interface_node(struct usb_device *udev, u8 config, u8 ifnum) { … } EXPORT_SYMBOL_GPL(…);
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