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common/core/src/ux_host_stack_configuration_interface_scan.c
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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** Host Stack */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_stack_configuration_interface_scan PORTABLE C */
/* 6.1.10 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function will scan all default interfaces for a specific */
/* configuration and call the registered class with the */
/* Class/SubClass/Protocol of the interface. */
/* */
/* INPUT */
/* */
/* configuration Configuration pointer */
/* */
/* OUTPUT */
/* */
/* Result of operation */
/* */
/* CALLS */
/* */
/* _ux_host_stack_class_call Call class command */
/* _ux_host_stack_device_configuration_select */
/* Select configuration */
/* _ux_host_stack_class_call Call class from host stack */
/* (ux_host_class_entry_function) Class entry function */
/* */
/* CALLED BY */
/* */
/* USBX Components */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 02-02-2021 Chaoqiong Xiao Initial Version 6.1.4 */
/* 01-31-2022 Chaoqiong Xiao Modified comment(s), */
/* added standalone support, */
/* resulting in version 6.1.10 */
/* */
/**************************************************************************/
UINT _ux_host_stack_configuration_interface_scan(UX_CONFIGURATION *configuration)
{
UX_INTERFACE *interface;
UINT nb_class_owners;
UX_HOST_CLASS *class;
UX_HOST_CLASS_COMMAND class_command;
UINT status;
/* Initialize class owners to 0. */
nb_class_owners = 0;
/* Get the first interface container for this configuration. */
interface = configuration -> ux_configuration_first_interface;
/* We now scan all the alternate settings 0 for each of the interfaces. */
while (interface != UX_NULL)
{
/* Is there a default interface? */
if(interface -> ux_interface_descriptor.bAlternateSetting == 0)
{
/* We have a default interface for this configuration. Call each class
with the class\subclass\protocol. We include the IAD for the cdc classes. */
class_command.ux_host_class_command_request = UX_HOST_CLASS_COMMAND_QUERY;
class_command.ux_host_class_command_container = (VOID *)interface;
class_command.ux_host_class_command_usage = UX_HOST_CLASS_COMMAND_USAGE_CSP;
class_command.ux_host_class_command_class = interface -> ux_interface_descriptor.bInterfaceClass;
class_command.ux_host_class_command_subclass = interface -> ux_interface_descriptor.bInterfaceSubClass;
class_command.ux_host_class_command_protocol = interface -> ux_interface_descriptor.bInterfaceProtocol;
class_command.ux_host_class_command_iad_class = interface -> ux_interface_iad_class ;
class_command.ux_host_class_command_iad_subclass = interface -> ux_interface_iad_subclass;
class_command.ux_host_class_command_iad_protocol = interface -> ux_interface_iad_protocol;
class = _ux_host_stack_class_call(&class_command);
/* On return, either we have found a class or the interface is still an orphan. */
if (class != UX_NULL)
{
/* There is a class. */
nb_class_owners++;
interface -> ux_interface_class = class;
}
}
/* point to the next interface until end of the list. */
interface = interface -> ux_interface_next_interface;
}
#if defined(UX_HOST_STANDALONE)
/* Activated later in state machine. */
status = (nb_class_owners > 0) ? UX_SUCCESS : UX_NO_CLASS_MATCH;
return(status);
#else
/* Assume no classes. */
status = UX_NO_CLASS_MATCH;
/* Check the number of class owner found. */
if (nb_class_owners != 0)
{
/* If we have found one or more classes for any of the interfaces,
we can safely do a SET_CONFIGURATION of the device. */
status = _ux_host_stack_device_configuration_select(configuration);
/* Check the completion status. */
if (status == UX_SUCCESS)
{
/* The device is in the CONFIGURED state, we have to call each of the classes
again with an ACTIVATE signal. */
interface = configuration -> ux_configuration_first_interface;
while (interface != UX_NULL)
{
/* Is there a default interface? */
if (interface -> ux_interface_descriptor.bAlternateSetting == 0)
{
/* We have found the default interface. If this interface is owned,
activate its class. */
class_command.ux_host_class_command_request = UX_HOST_CLASS_COMMAND_ACTIVATE;
class_command.ux_host_class_command_container = (VOID *) interface;
if (interface -> ux_interface_class != UX_NULL)
{
/* Save the class in the command container */
class_command.ux_host_class_command_class_ptr = interface -> ux_interface_class;
/* Send the ACTIVATE command to the class */
status = interface -> ux_interface_class -> ux_host_class_entry_function(&class_command);
}
}
/* Point to the next interface until end of the list. */
interface = interface -> ux_interface_next_interface;
}
}
}
/* Return operation result. */
return(status);
#endif
}