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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_device_configuration_reset 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 resets the configuration of the device to zero. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* configuration Pointer to 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_configuration_instance_delete */ |
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/* Delete configuration instance*/ |
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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_device_configuration_reset(UX_DEVICE *device) |
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{ |
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UX_TRANSFER *transfer_request; |
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UX_ENDPOINT *control_endpoint; |
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UX_CONFIGURATION *current_configuration; |
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UINT status; |
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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_HOST_STACK_DEVICE_CONFIGURATION_SELECT, device, 0, 0, 0, UX_TRACE_HOST_STACK_EVENTS, 0, 0) |
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/* A configuration is selected. Retrieve the pointer to the control endpoint |
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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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/* Check for the state of the device . If the device is already configured, |
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we need to cancel the existing configuration before resetting it. */ |
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✓✓ |
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if (device -> ux_device_state == UX_DEVICE_CONFIGURED) |
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{ |
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/* The device is configured. Get the first configuration pointer. */ |
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current_configuration = device -> ux_device_current_configuration; |
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/* Deselect this instance */ |
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_ux_host_stack_configuration_instance_delete(current_configuration); |
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} |
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/* No configuration is selected now. */ |
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device -> ux_device_current_configuration = UX_NULL; |
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/* Packed descriptor are not valid now. */ |
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✓✓ |
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if (device -> ux_device_packed_configuration) |
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{ |
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_ux_utility_memory_free(device -> ux_device_packed_configuration); |
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device -> ux_device_packed_configuration = UX_NULL; |
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device -> ux_device_packed_configuration_keep_count = 0; |
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} |
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/* Set state of device to ADDRESSED. */ |
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device -> ux_device_state = UX_DEVICE_ADDRESSED; |
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/* Reset power source. */ |
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device -> ux_device_power_source = UX_DEVICE_BUS_POWERED; |
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/* Create a transfer_request for the SET_CONFIGURATION request. No data for this request. */ |
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transfer_request -> ux_transfer_request_requested_length = 0; |
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transfer_request -> ux_transfer_request_function = UX_SET_CONFIGURATION; |
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transfer_request -> ux_transfer_request_type = UX_REQUEST_OUT | UX_REQUEST_TYPE_STANDARD | UX_REQUEST_TARGET_DEVICE; |
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transfer_request -> ux_transfer_request_value = 0; |
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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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/* Return status. */ |
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return(status); |
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} |
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