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- // SPDX-License-Identifier: GPL-2.0
- /*
- * of.c The helpers for hcd device tree support
- *
- * Copyright (C) 2016 Freescale Semiconductor, Inc.
- * Author: Peter Chen <peter.chen@freescale.com>
- * Copyright (C) 2017 Johan Hovold <johan@kernel.org>
- */
- #include <linux/of.h>
- #include <linux/of_platform.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)
- {
- struct device_node *node;
- u32 reg;
- for_each_child_of_node(hub->dev.of_node, node) {
- if (of_property_read_u32(node, "reg", ®))
- continue;
- if (reg == port1)
- return node;
- }
- return NULL;
- }
- EXPORT_SYMBOL_GPL(usb_of_get_device_node);
- /**
- * 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)
- {
- struct usb_device_descriptor *ddesc = &udev->descriptor;
- struct usb_config_descriptor *cdesc;
- if (!udev->dev.of_node)
- return false;
- switch (ddesc->bDeviceClass) {
- case USB_CLASS_PER_INTERFACE:
- case USB_CLASS_HUB:
- if (ddesc->bNumConfigurations == 1) {
- cdesc = &udev->config->desc;
- if (cdesc->bNumInterfaces == 1)
- return true;
- }
- }
- return false;
- }
- EXPORT_SYMBOL_GPL(usb_of_has_combined_node);
- /**
- * 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)
- {
- struct device_node *node;
- u32 reg[2];
- for_each_child_of_node(udev->dev.of_node, node) {
- if (of_property_read_u32_array(node, "reg", reg, 2))
- continue;
- if (reg[0] == ifnum && reg[1] == config)
- return node;
- }
- return NULL;
- }
- EXPORT_SYMBOL_GPL(usb_of_get_interface_node);
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