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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** 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_device_remove PORTABLE C */
/* 6.1.12 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function will remove a USB device from the bus. */
/* */
/* INPUT */
/* */
/* HCD Pointer to the HCD */
/* parent The parent device address */
/* port_index Index of the port on which the*/
/* change of status occurred */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_stack_device_resources_free Free all device resources */
/* */
/* CALLED BY */
/* */
/* USBX Components */
/* */
/**************************************************************************/
UINT _ux_host_stack_device_remove(UX_HCD *hcd, UX_DEVICE *parent, UINT port_index)
{
#if UX_MAX_DEVICES > 1
ULONG container_index;
#endif
UX_DEVICE *device;
UX_CONFIGURATION *configuration;
UX_INTERFACE *interface_ptr;
UX_HOST_CLASS_COMMAND command;
/* We need to find the device descriptor for the removed device. We can find it
with the parent device and the port it was attached to. Start with the first device. */
device = _ux_system_host -> ux_system_host_device_array;
#if UX_MAX_DEVICES > 1
/* Start at the beginning of the list. */
container_index = 0;
/* Search the list until the end. */
while (container_index++ < _ux_system_host -> ux_system_host_max_devices)
{
/* Until we have found a used entry. */
if (device -> ux_device_handle != UX_UNUSED)
{
/* Check for the parent device and the port location and the controller. */
if( UX_DEVICE_PARENT_MATCH(device, parent) &&
UX_DEVICE_PORT_LOCATION_MATCH(device, port_index) &&
UX_DEVICE_HCD_MATCH(device, hcd))
break;
}
/* Move to the next device entry. */
device++;
}
/* Device not found. */
if (container_index > _ux_system_host -> ux_system_host_max_devices)
#else
UX_PARAMETER_NOT_USED(parent);
UX_PARAMETER_NOT_USED(port_index);
/* Device is available and HCD is expected. */
if (device -> ux_device_handle == UX_UNUSED ||
!UX_DEVICE_HCD_MATCH(device, hcd))
#endif
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_ENUMERATOR, UX_DEVICE_HANDLE_UNKNOWN);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_DEVICE_HANDLE_UNKNOWN, device, 0, 0, UX_TRACE_ERRORS, 0, 0)
/* We get here when we could not find the device. */
return(UX_DEVICE_HANDLE_UNKNOWN);
}
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_STACK_DEVICE_REMOVE, hcd, parent, port_index, device, UX_TRACE_HOST_STACK_EVENTS, 0, 0)
/* If trace is enabled, unregister this object. */
UX_TRACE_OBJECT_UNREGISTER(device);
/* We have found the device to be removed. */
device -> ux_device_state = UX_DEVICE_REMOVED;
/* We have found the device to be removed. Initialize the class
command with the generic parameters. */
command.ux_host_class_command_request = UX_HOST_CLASS_COMMAND_DEACTIVATE;
/* The device may have a class associated with the device container or its interfaces. */
if (device -> ux_device_class_instance != UX_NULL)
{
/* We need to stop the class instance for the device. */
command.ux_host_class_command_instance = device -> ux_device_class_instance;
/* Call the class. */
device -> ux_device_class -> ux_host_class_entry_function(&command);
}
else
{
/* Search for the active configuration. */
configuration = device -> ux_device_current_configuration;
/* If configuration is activated. */
if (configuration != UX_NULL)
{
/* We have the correct configuration, search the interface(s). */
interface_ptr = configuration -> ux_configuration_first_interface;
/* Loop to perform the search. */
while (interface_ptr != UX_NULL)
{
/* Check if an instance of the interface is present. */
if (interface_ptr -> ux_interface_class_instance != UX_NULL)
{
/* We need to stop the class instance for the device. */
command.ux_host_class_command_instance = interface_ptr -> ux_interface_class_instance;
/* Call the class. */
interface_ptr -> ux_interface_class -> ux_host_class_entry_function(&command);
}
/* Move to next interface. */
interface_ptr = interface_ptr -> ux_interface_next_interface;
}
}
}
/* Notify application for disconnection of existing physical device. */
if (_ux_system_host -> ux_system_host_change_function)
{
_ux_system_host -> ux_system_host_change_function(UX_DEVICE_DISCONNECTION, UX_NULL, (VOID*)device);
}
/* Now all the resources for this device must be free. */
_ux_host_stack_device_resources_free(device);
/* Decrement the number of devices on this bus. */
hcd -> ux_hcd_nb_devices--;
/* We are done with this device removal. */
return(UX_SUCCESS);
}
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