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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* Copyright (c) 2026-present Eclipse ThreadX contributors |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** USBX Component */ |
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/** */ |
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/** Host Stack */ |
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/** */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/* Include necessary system files. */ |
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#define UX_SOURCE_CODE |
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#include "ux_api.h" |
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#include "ux_host_stack.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _ux_host_stack_configuration_descriptor_parse PORTABLE C */ |
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/* 6.1 */ |
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/* AUTHOR */ |
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/* */ |
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/* Chaoqiong Xiao, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function reads the entire configuration descriptor and */ |
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/* enumerates the interfaces, binds the interface to a class driver... */ |
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/* if the device has multiple configurations, we read all the */ |
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/* configurations but do not instantiate any configuration. Rather we */ |
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/* let a class driver do the work. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* device Pointer to device */ |
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/* configuration Pointer to configuration */ |
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/* configuration_index Index of configuration */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* Completion Status */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _ux_host_stack_interfaces_scan Scan host interfaces */ |
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/* _ux_host_stack_transfer_request Process transfer request */ |
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/* _ux_utility_memory_allocate Allocate block of memory */ |
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/* _ux_utility_memory_free Free block of memory */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* USBX Components */ |
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/* */ |
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/**************************************************************************/ |
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UINT _ux_host_stack_configuration_descriptor_parse(UX_DEVICE *device, UX_CONFIGURATION *configuration, |
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UINT configuration_index) |
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{ |
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UX_TRANSFER *transfer_request; |
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UINT status; |
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UCHAR *descriptor; |
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UX_ENDPOINT *control_endpoint; |
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ULONG total_configuration_length; |
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/* Retrieve the pointer to the control endpoint and its transfer_request. */ |
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control_endpoint = &device -> ux_device_control_endpoint; |
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transfer_request = &control_endpoint -> ux_endpoint_transfer_request; |
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/* Retrieve the size of all the configuration descriptor. */ |
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total_configuration_length = configuration -> ux_configuration_descriptor.wTotalLength; |
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/* Allocate enough memory to read all descriptors attached to this configuration. */ |
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descriptor = _ux_utility_memory_allocate(UX_SAFE_ALIGN, UX_CACHE_SAFE_MEMORY, total_configuration_length); |
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/* Determine if the memory was allocated. */ |
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✓✓ |
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if (descriptor == UX_NULL) |
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{ |
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/* No, return an error. */ |
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return(UX_MEMORY_INSUFFICIENT); |
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} |
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else |
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{ |
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/* Create a transfer_request for the GET_DESCRIPTOR request. */ |
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transfer_request -> ux_transfer_request_data_pointer = descriptor; |
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transfer_request -> ux_transfer_request_requested_length = total_configuration_length; |
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transfer_request -> ux_transfer_request_function = UX_GET_DESCRIPTOR; |
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transfer_request -> ux_transfer_request_type = UX_REQUEST_IN | UX_REQUEST_TYPE_STANDARD | UX_REQUEST_TARGET_DEVICE; |
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transfer_request -> ux_transfer_request_value = configuration_index | (UINT)(UX_CONFIGURATION_DESCRIPTOR_ITEM << 8); |
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transfer_request -> ux_transfer_request_index = 0; |
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/* Send request to HCD layer. */ |
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status = _ux_host_stack_transfer_request(transfer_request); |
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/* Check for correct transfer and entire descriptor returned. */ |
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✓✓✓✓
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if((status == UX_SUCCESS) && (transfer_request -> ux_transfer_request_actual_length == total_configuration_length)) |
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{ |
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/* The entire descriptor now contains the configuration descriptor, |
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the interface(s) descriptors, all alternate settings, endpoints |
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and descriptor specific to the class. The descriptor is parsed for all interfaces. */ |
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status = _ux_host_stack_interfaces_scan(configuration, descriptor); |
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} |
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} |
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/* Free all used resources. */ |
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_ux_utility_memory_free(descriptor); |
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/* Return completion status. */ |
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return(status); |
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} |
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