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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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/** Device Stack */ |
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/** */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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#define UX_SOURCE_CODE |
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/* Include necessary system files. */ |
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#include "ux_api.h" |
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#include "ux_device_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_device_stack_alternate_setting_set PORTABLE C */ |
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/* 6.1.12 */ |
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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 sets the alternate setting for a specific interface. */ |
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/* The previous interface is unmounted and all the endpoints */ |
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/* associated with the alternate setting are mounted. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* endpoint Pointer to endpoint */ |
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/* interface_value Interface value */ |
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/* alternate_setting_value Alternate setting value */ |
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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_slave_dcd_function) DCD dispatch function */ |
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/* _ux_utility_descriptor_parse Parse descriptor */ |
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/* _ux_device_stack_transfer_all_request_abort */ |
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/* Abort transfer */ |
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/* _ux_utility_memory_copy Copy memory */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Application */ |
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/* Device Stack */ |
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/* */ |
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/**************************************************************************/ |
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UINT _ux_device_stack_alternate_setting_set(ULONG interface_value, ULONG alternate_setting_value) |
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{ |
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UX_SLAVE_DEVICE *device; |
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UX_SLAVE_INTERFACE *interface_ptr; |
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#if !defined(UX_DEVICE_ALTERNATE_SETTING_SUPPORT_DISABLE) |
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UX_SLAVE_DCD *dcd; |
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UX_SLAVE_TRANSFER *transfer_request; |
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UCHAR *device_framework; |
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ULONG device_framework_length; |
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ULONG descriptor_length; |
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UCHAR descriptor_type; |
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UX_CONFIGURATION_DESCRIPTOR configuration_descriptor; |
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UX_INTERFACE_DESCRIPTOR interface_descriptor; |
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UX_SLAVE_ENDPOINT *endpoint; |
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UX_SLAVE_ENDPOINT *next_endpoint; |
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UX_SLAVE_ENDPOINT *endpoint_link; |
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ULONG endpoints_pool_number; |
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UX_SLAVE_CLASS_COMMAND class_command; |
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UX_SLAVE_CLASS *class_ptr; |
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UINT status; |
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ULONG max_transfer_length, n_trans; |
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#endif |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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UX_TRACE_IN_LINE_INSERT(UX_TRACE_DEVICE_STACK_ALTERNATE_SETTING_SET, interface_value, alternate_setting_value, 0, 0, UX_TRACE_DEVICE_STACK_EVENTS, 0, 0) |
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/* Get the pointer to the device. */ |
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device = &_ux_system_slave -> ux_system_slave_device; |
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/* Protocol error must be reported when it's unconfigured */ |
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✓✓ |
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if (device -> ux_slave_device_state != UX_DEVICE_CONFIGURED) |
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return(UX_FUNCTION_NOT_SUPPORTED); |
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/* Find the current interface. */ |
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interface_ptr = device -> ux_slave_device_first_interface; |
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#if !defined(UX_DEVICE_INITIALIZE_FRAMEWORK_SCAN_DISABLE) || UX_MAX_DEVICE_INTERFACES > 1 |
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/* Scan all interfaces if any. */ |
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✓✓ |
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while (interface_ptr != UX_NULL) |
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{ |
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✓✓ |
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if (interface_ptr -> ux_slave_interface_descriptor.bInterfaceNumber == interface_value) |
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break; |
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else |
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interface_ptr = interface_ptr -> ux_slave_interface_next_interface; |
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} |
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#else |
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if (interface_ptr -> ux_slave_interface_descriptor.bInterfaceNumber != interface_value) |
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interface_ptr = UX_NULL; |
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#endif |
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/* We must have found the interface pointer for the interface value |
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requested by the caller. */ |
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✓✓ |
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if (interface_ptr == UX_NULL) |
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{ |
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/* Error trap. */ |
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_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_INTERFACE_HANDLE_UNKNOWN); |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_INTERFACE_HANDLE_UNKNOWN, interface_ptr, 0, 0, UX_TRACE_ERRORS, 0, 0) |
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return(UX_INTERFACE_HANDLE_UNKNOWN); |
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} |
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/* If the host is requesting a change of alternate setting to the current one, |
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we do not need to do any work. */ |
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✓✓ |
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if (interface_ptr -> ux_slave_interface_descriptor.bAlternateSetting == alternate_setting_value) |
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return(UX_SUCCESS); |
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#if defined(UX_DEVICE_ALTERNATE_SETTING_SUPPORT_DISABLE) |
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/* If alternate setting is disabled, do error trap. */ |
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_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_FUNCTION_NOT_SUPPORTED); |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_FUNCTION_NOT_SUPPORTED, interface_ptr, 0, 0, UX_TRACE_ERRORS, 0, 0) |
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return(UX_FUNCTION_NOT_SUPPORTED); |
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#else |
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/* Get the pointer to the DCD. */ |
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dcd = &_ux_system_slave->ux_system_slave_dcd; |
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/* We may have multiple configurations! */ |
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device_framework = _ux_system_slave -> ux_system_slave_device_framework; |
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device_framework_length = _ux_system_slave -> ux_system_slave_device_framework_length; |
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/* Parse the device framework and locate a configuration descriptor. */ |
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✓✓ |
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while (device_framework_length != 0) |
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{ |
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/* Get the length of the current descriptor. */ |
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descriptor_length = (ULONG) *device_framework; |
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/* And its length. */ |
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descriptor_type =* (device_framework + 1); |
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/* Check if this is a configuration descriptor. */ |
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✓✓ |
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if (descriptor_type == UX_CONFIGURATION_DESCRIPTOR_ITEM) |
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{ |
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/* Parse the descriptor in something more readable. */ |
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_ux_utility_descriptor_parse(device_framework, |
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_ux_system_configuration_descriptor_structure, |
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UX_CONFIGURATION_DESCRIPTOR_ENTRIES, |
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(UCHAR *) &configuration_descriptor); |
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/* Now we need to check the configuration value. */ |
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✓✓ |
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if (configuration_descriptor.bConfigurationValue == device -> ux_slave_device_configuration_selected) |
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{ |
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/* Limit the search in current configuration descriptor. */ |
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device_framework_length = configuration_descriptor.wTotalLength; |
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/* We have found the configuration value that was selected by the host |
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We need to scan all the interface descriptors following this |
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configuration descriptor and locate the interface for which the alternate |
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setting must be changed. */ |
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✓✓ |
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while (device_framework_length != 0) |
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{ |
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/* Get the length of the current descriptor. */ |
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descriptor_length = (ULONG) *device_framework; |
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/* And its type. */ |
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descriptor_type = *(device_framework + 1); |
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/* Check if this is an interface descriptor. */ |
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✓✓ |
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if (descriptor_type == UX_INTERFACE_DESCRIPTOR_ITEM) |
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{ |
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/* Parse the descriptor in something more readable. */ |
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_ux_utility_descriptor_parse(device_framework, |
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_ux_system_interface_descriptor_structure, |
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UX_INTERFACE_DESCRIPTOR_ENTRIES, |
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(UCHAR *) &interface_descriptor); |
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/* Check if this is the interface we are searching. */ |
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✓✓ |
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if (interface_descriptor.bInterfaceNumber == interface_value && |
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✓✓ |
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interface_descriptor.bAlternateSetting == alternate_setting_value) |
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{ |
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/* We have found the right interface and alternate setting. Before |
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we mount all the endpoints for this interface, we need to |
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unmount the endpoints associated with the previous alternate setting. */ |
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endpoint = interface_ptr -> ux_slave_interface_first_endpoint; |
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✓✓ |
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while (endpoint != UX_NULL) |
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{ |
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/* Abort any pending transfer. */ |
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_ux_device_stack_transfer_all_request_abort(endpoint, UX_TRANSFER_BUS_RESET); |
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/* The device controller must be called to destroy the endpoint. */ |
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dcd -> ux_slave_dcd_function(dcd, UX_DCD_DESTROY_ENDPOINT, (VOID *) endpoint); |
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/* Get the next endpoint. */ |
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next_endpoint = endpoint -> ux_slave_endpoint_next_endpoint; |
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/* Free the endpoint. */ |
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endpoint -> ux_slave_endpoint_status = UX_UNUSED; |
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/* Make sure the endpoint instance is now cleaned up. */ |
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endpoint -> ux_slave_endpoint_state = 0; |
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endpoint -> ux_slave_endpoint_next_endpoint = UX_NULL; |
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endpoint -> ux_slave_endpoint_interface = UX_NULL; |
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endpoint -> ux_slave_endpoint_device = UX_NULL; |
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/* Now we refresh the endpoint pointer. */ |
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endpoint = next_endpoint; |
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} |
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/* Now clear the interface endpoint entry. */ |
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interface_ptr -> ux_slave_interface_first_endpoint = UX_NULL; |
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/* Point beyond the interface descriptor. */ |
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device_framework_length -= (ULONG) *device_framework; |
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device_framework += (ULONG) *device_framework; |
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/* Parse the device framework and locate endpoint descriptor(s). */ |
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✓✓ |
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while (device_framework_length != 0) |
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{ |
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256 |
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/* Get the length of the current descriptor. */ |
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descriptor_length = (ULONG) *device_framework; |
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/* And its type. */ |
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descriptor_type = *(device_framework + 1); |
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/* Check if this is an endpoint descriptor. */ |
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✓✓✓ |
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switch(descriptor_type) |
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{ |
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case UX_ENDPOINT_DESCRIPTOR_ITEM: |
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/* Find a free endpoint in the pool and hook it to the |
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existing interface after it's created by DCD. */ |
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endpoint = device -> ux_slave_device_endpoints_pool; |
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endpoints_pool_number = device -> ux_slave_device_endpoints_pool_number; |
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✓✓ |
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while (endpoints_pool_number != 0) |
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{ |
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/* Check if this endpoint is free. */ |
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✓✓ |
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if (endpoint -> ux_slave_endpoint_status == UX_UNUSED) |
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{ |
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/* Mark this endpoint as used now. */ |
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endpoint -> ux_slave_endpoint_status = UX_USED; |
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break; |
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} |
281 |
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282 |
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/* Try the next endpoint. */ |
283 |
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endpoint++; |
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285 |
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/* Decrement the number of endpoints to scan from the pool. */ |
286 |
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endpoints_pool_number--; |
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} |
288 |
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289 |
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/* Did we find a free endpoint ? */ |
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✓✓ |
255 |
if (endpoints_pool_number == 0) |
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1 |
return(UX_MEMORY_INSUFFICIENT); |
292 |
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293 |
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/* Parse the descriptor in something more readable. */ |
294 |
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_ux_utility_descriptor_parse(device_framework, |
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_ux_system_endpoint_descriptor_structure, |
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UX_ENDPOINT_DESCRIPTOR_ENTRIES, |
297 |
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(UCHAR *) &endpoint -> ux_slave_endpoint_descriptor); |
298 |
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299 |
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/* Now we create a transfer request to accept transfer on this endpoint. */ |
300 |
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transfer_request = &endpoint -> ux_slave_endpoint_transfer_request; |
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302 |
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/* Validate descriptor wMaxPacketSize. */ |
303 |
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UX_ASSERT(endpoint -> ux_slave_endpoint_descriptor.wMaxPacketSize != 0); |
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305 |
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/* Calculate endpoint transfer payload max size. */ |
306 |
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254 |
max_transfer_length = |
307 |
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254 |
endpoint -> ux_slave_endpoint_descriptor.wMaxPacketSize & |
308 |
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UX_MAX_PACKET_SIZE_MASK; |
309 |
✓✓ |
254 |
if ((_ux_system_slave -> ux_system_slave_speed == UX_HIGH_SPEED_DEVICE) && |
310 |
✓✓ |
14 |
(endpoint -> ux_slave_endpoint_descriptor.bmAttributes & 0x1u)) |
311 |
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{ |
312 |
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6 |
n_trans = endpoint -> ux_slave_endpoint_descriptor.wMaxPacketSize & |
313 |
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UX_MAX_NUMBER_OF_TRANSACTIONS_MASK; |
314 |
✓✓ |
6 |
if (n_trans) |
315 |
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{ |
316 |
|
5 |
n_trans >>= UX_MAX_NUMBER_OF_TRANSACTIONS_SHIFT; |
317 |
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5 |
n_trans ++; |
318 |
|
5 |
max_transfer_length *= n_trans; |
319 |
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} |
320 |
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} |
321 |
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322 |
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/* Validate max transfer size and save it. */ |
323 |
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UX_ASSERT(max_transfer_length <= UX_SLAVE_REQUEST_DATA_MAX_LENGTH); |
324 |
|
254 |
transfer_request -> ux_slave_transfer_request_transfer_length = max_transfer_length; |
325 |
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326 |
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/* We store the endpoint in the transfer request as well. */ |
327 |
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254 |
transfer_request -> ux_slave_transfer_request_endpoint = endpoint; |
328 |
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329 |
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/* By default the timeout is infinite on request. */ |
330 |
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254 |
transfer_request -> ux_slave_transfer_request_timeout = UX_WAIT_FOREVER; |
331 |
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332 |
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/* Attach the interface to the endpoint. */ |
333 |
|
254 |
endpoint -> ux_slave_endpoint_interface = interface_ptr; |
334 |
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335 |
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/* Attach the device to the endpoint. */ |
336 |
|
254 |
endpoint -> ux_slave_endpoint_device = device; |
337 |
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338 |
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/* Create the endpoint at the DCD level. */ |
339 |
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254 |
status = dcd -> ux_slave_dcd_function(dcd, UX_DCD_CREATE_ENDPOINT, (VOID *) endpoint); |
340 |
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341 |
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/* Do a sanity check on endpoint creation. */ |
342 |
✓✓ |
254 |
if (status != UX_SUCCESS) |
343 |
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{ |
344 |
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345 |
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/* Error was returned, endpoint cannot be created. */ |
346 |
|
1 |
endpoint -> ux_slave_endpoint_status = UX_UNUSED; |
347 |
|
1 |
return(status); |
348 |
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} |
349 |
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350 |
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/* Attach this endpoint to the end of the endpoint chain. */ |
351 |
✓✓ |
253 |
if (interface_ptr -> ux_slave_interface_first_endpoint == UX_NULL) |
352 |
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{ |
353 |
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354 |
|
139 |
interface_ptr -> ux_slave_interface_first_endpoint = endpoint; |
355 |
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} |
356 |
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else |
357 |
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{ |
358 |
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/* Multiple endpoints exist, so find the end of the chain. */ |
359 |
|
114 |
endpoint_link = interface_ptr -> ux_slave_interface_first_endpoint; |
360 |
✓✓ |
126 |
while (endpoint_link -> ux_slave_endpoint_next_endpoint != UX_NULL) |
361 |
|
12 |
endpoint_link = endpoint_link -> ux_slave_endpoint_next_endpoint; |
362 |
|
114 |
endpoint_link -> ux_slave_endpoint_next_endpoint = endpoint; |
363 |
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} |
364 |
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365 |
|
253 |
break; |
366 |
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367 |
|
45 |
case UX_CONFIGURATION_DESCRIPTOR_ITEM: |
368 |
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case UX_INTERFACE_DESCRIPTOR_ITEM: |
369 |
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370 |
|
|
/* We have found a new configuration or interface descriptor, this is the end of the current |
371 |
|
|
interface. The search for the endpoints must be terminated as if it was the end of the |
372 |
|
|
entire descriptor. */ |
373 |
|
45 |
device_framework_length = descriptor_length; |
374 |
|
|
|
375 |
|
45 |
break; |
376 |
|
|
|
377 |
|
|
|
378 |
|
73 |
default: |
379 |
|
|
|
380 |
|
|
/* We have found another descriptor embedded in the interface. Ignore it. */ |
381 |
|
73 |
break; |
382 |
|
|
} |
383 |
|
|
|
384 |
|
|
/* Adjust what is left of the device framework. */ |
385 |
|
371 |
device_framework_length -= descriptor_length; |
386 |
|
|
|
387 |
|
|
/* Point to the next descriptor. */ |
388 |
|
371 |
device_framework += descriptor_length; |
389 |
|
|
} |
390 |
|
|
|
391 |
|
|
/* The interface descriptor in the current class must be changed to the new alternate setting. */ |
392 |
|
160 |
_ux_utility_memory_copy(&interface_ptr -> ux_slave_interface_descriptor, &interface_descriptor, sizeof(UX_INTERFACE_DESCRIPTOR)); /* Use case of memcpy is verified. */ |
393 |
|
|
|
394 |
|
|
/* Get the class for the interface. */ |
395 |
|
160 |
class_ptr = _ux_system_slave -> ux_system_slave_interface_class_array[interface_ptr -> ux_slave_interface_descriptor.bInterfaceNumber]; |
396 |
|
|
|
397 |
|
|
/* Check if class driver is available. */ |
398 |
✓✓✓✓
|
160 |
if (class_ptr == UX_NULL || class_ptr -> ux_slave_class_status == UX_UNUSED) |
399 |
|
|
{ |
400 |
|
|
|
401 |
|
5 |
return (UX_NO_CLASS_MATCH); |
402 |
|
|
} |
403 |
|
|
|
404 |
|
|
/* The interface attached to this configuration must be changed at the class |
405 |
|
|
level. */ |
406 |
|
155 |
class_command.ux_slave_class_command_request = UX_SLAVE_CLASS_COMMAND_CHANGE; |
407 |
|
155 |
class_command.ux_slave_class_command_interface = (VOID *) interface_ptr; |
408 |
|
|
|
409 |
|
|
/* And store it. */ |
410 |
|
155 |
class_command.ux_slave_class_command_class_ptr = class_ptr; |
411 |
|
|
|
412 |
|
|
/* We can now memorize the interface pointer associated with this class. */ |
413 |
|
155 |
class_ptr -> ux_slave_class_interface = interface_ptr; |
414 |
|
|
|
415 |
|
|
/* We have found a potential candidate. Call this registered class entry function to change the alternate setting. */ |
416 |
|
155 |
status = class_ptr -> ux_slave_class_entry_function(&class_command); |
417 |
|
|
|
418 |
|
|
/* We are done here. */ |
419 |
|
155 |
return(status); |
420 |
|
|
} |
421 |
|
|
} |
422 |
|
|
|
423 |
|
|
/* Adjust what is left of the device framework. */ |
424 |
|
1419 |
device_framework_length -= descriptor_length; |
425 |
|
|
|
426 |
|
|
/* Point to the next descriptor. */ |
427 |
|
1419 |
device_framework += descriptor_length; |
428 |
|
|
} |
429 |
|
|
|
430 |
|
|
/* In case alter setting not found, report protocol error. */ |
431 |
|
4 |
break; |
432 |
|
|
} |
433 |
|
|
} |
434 |
|
|
|
435 |
|
|
/* Adjust what is left of the device framework. */ |
436 |
|
243 |
device_framework_length -= descriptor_length; |
437 |
|
|
|
438 |
|
|
/* Point to the next descriptor. */ |
439 |
|
243 |
device_framework += descriptor_length; |
440 |
|
|
} |
441 |
|
|
|
442 |
|
|
/* Return error completion. */ |
443 |
|
5 |
return(UX_ERROR); |
444 |
|
|
#endif |
445 |
|
|
} |
446 |
|
|
|