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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_remove 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 will remove a USB device from the bus. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* HCD Pointer to the HCD */ |
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/* parent The parent device address */ |
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/* port_index Index of the port on which the*/ |
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/* change of status occurred */ |
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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_device_resources_free Free all device resources */ |
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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_remove(UX_HCD *hcd, UX_DEVICE *parent, UINT port_index) |
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{ |
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#if UX_MAX_DEVICES > 1 |
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ULONG container_index; |
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#endif |
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UX_DEVICE *device; |
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UX_CONFIGURATION *configuration; |
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UX_INTERFACE *interface_ptr; |
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UX_HOST_CLASS_COMMAND command; |
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/* We need to find the device descriptor for the removed device. We can find it |
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with the parent device and the port it was attached to. Start with the first device. */ |
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device = _ux_system_host -> ux_system_host_device_array; |
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#if UX_MAX_DEVICES > 1 |
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/* Start at the beginning of the list. */ |
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container_index = 0; |
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/* Search the list until the end. */ |
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✓✓ |
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while (container_index++ < _ux_system_host -> ux_system_host_max_devices) |
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{ |
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/* Until we have found a used entry. */ |
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✓✓ |
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if (device -> ux_device_handle != UX_UNUSED) |
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{ |
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/* Check for the parent device and the port location and the controller. */ |
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✓✓ |
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if( UX_DEVICE_PARENT_MATCH(device, parent) && |
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✓✓ |
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UX_DEVICE_PORT_LOCATION_MATCH(device, port_index) && |
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✓✓ |
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UX_DEVICE_HCD_MATCH(device, hcd)) |
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break; |
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} |
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/* Move to the next device entry. */ |
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device++; |
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} |
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/* Device not found. */ |
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✓✓ |
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if (container_index > _ux_system_host -> ux_system_host_max_devices) |
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#else |
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UX_PARAMETER_NOT_USED(parent); |
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UX_PARAMETER_NOT_USED(port_index); |
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/* Device is available and HCD is expected. */ |
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if (device -> ux_device_handle == UX_UNUSED || |
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!UX_DEVICE_HCD_MATCH(device, hcd)) |
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#endif |
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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_ENUMERATOR, UX_DEVICE_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_DEVICE_HANDLE_UNKNOWN, device, 0, 0, UX_TRACE_ERRORS, 0, 0) |
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/* We get here when we could not find the device. */ |
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return(UX_DEVICE_HANDLE_UNKNOWN); |
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} |
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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_REMOVE, hcd, parent, port_index, device, UX_TRACE_HOST_STACK_EVENTS, 0, 0) |
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/* If trace is enabled, unregister this object. */ |
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UX_TRACE_OBJECT_UNREGISTER(device); |
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/* We have found the device to be removed. */ |
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device -> ux_device_state = UX_DEVICE_REMOVED; |
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/* We have found the device to be removed. Initialize the class |
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command with the generic parameters. */ |
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command.ux_host_class_command_request = UX_HOST_CLASS_COMMAND_DEACTIVATE; |
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/* The device may have a class associated with the device container or its interfaces. */ |
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✓✓ |
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if (device -> ux_device_class_instance != UX_NULL) |
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{ |
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/* We need to stop the class instance for the device. */ |
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command.ux_host_class_command_instance = device -> ux_device_class_instance; |
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/* Call the class. */ |
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device -> ux_device_class -> ux_host_class_entry_function(&command); |
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} |
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else |
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{ |
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/* Search for the active configuration. */ |
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configuration = device -> ux_device_current_configuration; |
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/* If configuration is activated. */ |
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✓✓ |
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if (configuration != UX_NULL) |
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{ |
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/* We have the correct configuration, search the interface(s). */ |
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interface_ptr = configuration -> ux_configuration_first_interface; |
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/* Loop to perform the search. */ |
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✓✓ |
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while (interface_ptr != UX_NULL) |
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{ |
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/* Check if an instance of the interface is present. */ |
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✓✓ |
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if (interface_ptr -> ux_interface_class_instance != UX_NULL) |
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{ |
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/* We need to stop the class instance for the device. */ |
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command.ux_host_class_command_instance = interface_ptr -> ux_interface_class_instance; |
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/* Call the class. */ |
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interface_ptr -> ux_interface_class -> ux_host_class_entry_function(&command); |
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} |
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/* Move to next interface. */ |
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interface_ptr = interface_ptr -> ux_interface_next_interface; |
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} |
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} |
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} |
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/* Notify application for disconnection of existing physical device. */ |
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✓✓ |
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if (_ux_system_host -> ux_system_host_change_function) |
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{ |
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_ux_system_host -> ux_system_host_change_function(UX_DEVICE_DISCONNECTION, UX_NULL, (VOID*)device); |
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} |
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/* Now all the resources for this device must be free. */ |
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_ux_host_stack_device_resources_free(device); |
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/* Decrement the number of devices on this bus. */ |
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hcd -> ux_hcd_nb_devices--; |
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/* We are done with this device removal. */ |
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return(UX_SUCCESS); |
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} |