subsys/usb/device_next/usbd_class_api.h

/*
 * Copyright (c) 2022 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/**
 * @file
 * @brief USB device stack class instances API
 *
 * This file contains the USB device stack class instances API.
 */

#ifndef ZEPHYR_INCLUDE_USBD_CLASS_API_H
#define ZEPHYR_INCLUDE_USBD_CLASS_API_H

#include <zephyr/usb/usbd.h>

/**
 * @brief Endpoint request completion event handler
 *
 * This is the event handler for all endpoint accommodated
 * by a class instance.
 *
 * @param[in] dev Pointer to device struct of the class instance
 * @param[in] buf Control Request Data buffer
 * @param[in] err Result of the transfer. 0 if the transfer was successful.
 */
static inline int usbd_class_request(struct usbd_class_node *const node,
				     struct net_buf *const buf,
				     int err)
{
	const struct usbd_class_api *api = node->api;

	if (api->request != NULL) {
		return api->request(node, buf, err);
	}

	return -ENOTSUP;
}


/**
 * @brief USB control request handler
 *
 * Common handler for all control request.
 * Regardless requests recipient, interface or endpoint,
 * the USB device core will identify proper class instance
 * and call this handler.
 * For the vendor type request USBD_VENDOR_REQ macro must be used
 * to identify the class, if more than one class instance is
 * present, only the first one will be called.
 *
 * The execution of the handler must not block.
 *
 * @param[in] dev Pointer to device struct of the class instance
 * @param[in] setup Pointer to USB Setup Packet
 * @param[in] buf Control Request Data buffer
 *
 * @return 0 on success, other values on fail.
 */
static inline int usbd_class_control_to_host(struct usbd_class_node *const node,
					     struct usb_setup_packet *const setup,
					     struct net_buf *const buf)
{
	const struct usbd_class_api *api = node->api;

	if (api->control_to_host != NULL) {
		return api->control_to_host(node, setup, buf);
	}

	errno = -ENOTSUP;
	return 0;
}

/**
 * @brief USB control request handler
 *
 * Common handler for all control request.
 * Regardless requests recipient, interface or endpoint,
 * the USB device core will identify proper class instance
 * and call this handler.
 * For the vendor type request USBD_VENDOR_REQ macro must be used
 * to identify the class, if more than one class instance is
 * present, only the first one will be called.
 *
 * The execution of the handler must not block.
 *
 * @param[in] dev Pointer to device struct of the class instance
 * @param[in] setup Pointer to USB Setup Packet
 * @param[in] buf Control Request Data buffer
 *
 * @return 0 on success, other values on fail.
 */
static inline int usbd_class_control_to_dev(struct usbd_class_node *const node,
					    struct usb_setup_packet *const setup,
					    struct net_buf *const buf)
{
	const struct usbd_class_api *api = node->api;

	if (api->control_to_dev != NULL) {
		return api->control_to_dev(node, setup, buf);
	}

	errno = -ENOTSUP;
	return 0;
}

/**
 * @brief Configuration update handler
 *
 * Called when the configuration of the interface belonging
 * to the instance has been changed, either because of
 * Set Configuration or Set Interface request.
 *
 * The execution of the handler must not block.
 *
 * @param[in] dev Pointer to device struct of the class instance
 * @param[in] setup Pointer to USB setup packet
 */
static inline void usbd_class_update(struct usbd_class_node *const node,
				     const uint8_t iface,
				     const uint8_t alternate)
{
	const struct usbd_class_api *api = node->api;

	if (api->update != NULL) {
		api->update(node, iface, alternate);
	}
}

/**
 * @brief USB suspended handler
 *
 * @param[in] dev Pointer to device struct of the class instance
 * @param[in] event Power management event
 *
 * @return 0 on success, other values on fail.
 */
static inline void usbd_class_suspended(struct usbd_class_node *const node)
{
	const struct usbd_class_api *api = node->api;

	if (api->suspended != NULL) {
		api->suspended(node);
	}
}


/**
 * @brief USB resumed handler
 *
 * @param[in] dev Pointer to device struct of the class instance
 * @param[in] event Power management event
 *
 * @return 0 on success, other values on fail.
 */
static inline void usbd_class_resumed(struct usbd_class_node *const node)
{
	const struct usbd_class_api *api = node->api;

	if (api->resumed != NULL) {
		api->resumed(node);
	}
}

/**
 * @brief Class associated configuration activ handler
 *
 * @note The execution of the handler must not block.
 *
 * @param[in] dev Pointer to device struct of the class instance
 */
static inline void usbd_class_enable(struct usbd_class_node *const node)
{
	const struct usbd_class_api *api = node->api;

	if (api->enable != NULL) {
		api->enable(node);
	}
}

/**
 * @brief Class associated configuration shutdown handler
 *
 * @note The execution of the handler must not block.
 *
 * @param[in] dev Pointer to device struct of the class instance
 */
static inline void usbd_class_disable(struct usbd_class_node *const node)
{
	const struct usbd_class_api *api = node->api;

	if (api->disable != NULL) {
		api->disable(node);
	}
}

/**
 * @brief Initialization of the class implementation
 *
 * This is called for each instance during the initialization phase
 * after the interface number and endpoint addresses are assigned
 * to the corresponding instance.
 * It can be used to initialize class specific descriptors or
 * underlying systems.
 *
 * @note If this call fails the core will terminate stack initialization.
 *
 * @param[in] dev Pointer to device struct of the class instance
 *
 * @return 0 on success, other values on fail.
 */
static inline int usbd_class_init(struct usbd_class_node *const node)
{
	const struct usbd_class_api *api = node->api;

	if (api->init != NULL) {
		return api->init(node);
	}

	return -ENOTSUP;
}


#endif /* ZEPHYR_INCLUDE_USBD_CLASS_API_H */