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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_resources_free PORTABLE C */
/* 6.1.12 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function will free all the device resources allocated. */
/* */
/* INPUT */
/* */
/* device Device pointer */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_stack_endpoint_transfer_abort */
/* Abort transfer */
/* _ux_host_stack_endpoint_instance_delete */
/* Delete endpoint instance */
/* _ux_utility_memory_free Free memory block */
/* _ux_utility_memory_set Set memory with a value */
/* _ux_utility_semaphore_delete Semaphore delete */
/* _ux_utility_thread_schedule_other Sleep thread to let others */
/* run */
/* (ux_hcd_entry_function) HCD entry function */
/* */
/* CALLED BY */
/* */
/* USBX Components */
/* */
/**************************************************************************/
UINT _ux_host_stack_device_resources_free(UX_DEVICE *device)
{
UX_CONFIGURATION *configuration;
UX_INTERFACE *interface_ptr;
UX_ENDPOINT *endpoint;
VOID *container;
ULONG current_alternate_setting;
UX_HCD *hcd;
#if UX_MAX_DEVICES > 1
UINT device_address_byte_index;
UINT device_address_bit_index;
UCHAR device_address_byte;
#endif
#if defined(UX_HOST_STANDALONE)
UX_DEVICE *enum_next;
#endif
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_STACK_DEVICE_RESOURCE_FREE, device, 0, 0, 0, UX_TRACE_HOST_STACK_EVENTS, 0, 0)
#if defined(UX_HOST_STANDALONE)
/* Free possible allocated enumeration resources. */
if (device -> ux_device_flags & UX_DEVICE_FLAG_ENUM)
{
/* If transfer buffer is not freed, free it. */
if (device -> ux_device_enum_trans &&
device -> ux_device_enum_trans -> ux_transfer_request_data_pointer)
{
_ux_utility_memory_free(device -> ux_device_enum_trans ->
ux_transfer_request_data_pointer);
}
/* If configuration is not attached, free it. */
if ((device -> ux_device_enum_state == UX_HOST_STACK_ENUM_CONFIG_DESCR_PARSE) ||
((device -> ux_device_enum_state == UX_HOST_STACK_ENUM_TRANS_WAIT) &&
(device -> ux_device_enum_next_state == UX_HOST_STACK_ENUM_CONFIG_DESCR_PARSE)))
{
if (device -> ux_device_enum_inst.configuration &&
device -> ux_device_enum_inst.configuration ->
ux_configuration_device == UX_NULL)
{
_ux_utility_memory_free(device -> ux_device_enum_inst.ptr);
}
}
}
/* Reset device flags. */
device -> ux_device_flags = 0;
#endif
/* Set the alternate setting to zero. */
current_alternate_setting = 0;
/* Get the first configuration registered to the device. */
configuration = device -> ux_device_first_configuration;
/* Parse all the configurations, remove all resources for the possible configuration. */
while (configuration != UX_NULL)
{
/* We have the correct configuration, search the interface(s). */
interface_ptr = configuration -> ux_configuration_first_interface;
/* Parse all the interfaces. */
while (interface_ptr != UX_NULL)
{
/* The alternate setting 0 has the selected alternate setting value. */
if (interface_ptr -> ux_interface_descriptor.bAlternateSetting == 0)
current_alternate_setting = interface_ptr -> ux_interface_current_alternate_setting;
/* If this is the selected interface, we need to free all the endpoints
attached to the alternate setting for this interface. */
endpoint = interface_ptr -> ux_interface_first_endpoint;
/* Parse all the endpoints. */
while (endpoint != UX_NULL)
{
/* Check if this is the selected interface. */
if (interface_ptr -> ux_interface_descriptor.bAlternateSetting == current_alternate_setting)
{
/* Delete the endpoint instance first. */
_ux_host_stack_endpoint_instance_delete(endpoint);
}
/* Memorize the endpoint container address. */
container = (VOID *) endpoint;
/* Get the next endpoint. */
endpoint = endpoint -> ux_endpoint_next_endpoint;
/* Delete the endpoint container. */
_ux_utility_memory_free(container);
}
/* Memorize the interface container address. */
container = (VOID *) interface_ptr;
/* Get the next interface. */
interface_ptr = interface_ptr -> ux_interface_next_interface;
/* Delete the interface container. */
_ux_utility_memory_free(container);
}
/* Memorize this configuration address before we free it. */
container = (VOID *) configuration;
/* Move to the next configuration in the list. */
configuration = configuration -> ux_configuration_next_configuration;
/* Free the configuration. */
_ux_utility_memory_free(container);
}
/* If there was a copy of packed descriptor, free it. */
if (device -> ux_device_packed_configuration)
{
_ux_utility_memory_free(device -> ux_device_packed_configuration);
/* Pointer and keep count is set NULL later while reseting instance memory. */
}
/* We need the HCD address for the control endpoint removal and to free
the device address. */
hcd = UX_DEVICE_HCD_GET(device);
/* Was the control endpoint already created ? */
if (device -> ux_device_control_endpoint.ux_endpoint_state != 0)
{
/* There may be pending transactions on the control endpoint. They need to be aborted. */
_ux_host_stack_endpoint_transfer_abort(&device -> ux_device_control_endpoint);
/* The enumeration thread needs to sleep a while to allow the application or the class that may be using
the control endpoint to exit properly. */
_ux_host_thread_schedule_other(UX_THREAD_PRIORITY_ENUM);
/* The control endpoint should be destroyed at the HCD level. */
hcd -> ux_hcd_entry_function(hcd, UX_HCD_DESTROY_ENDPOINT, (VOID *) &device -> ux_device_control_endpoint);
}
/* The semaphore attached to the control endpoint must be destroyed. */
_ux_host_semaphore_delete(&device -> ux_device_control_endpoint.ux_endpoint_transfer_request.ux_transfer_request_semaphore);
#if UX_MAX_DEVICES > 1
/* Check if the device had an assigned address. */
if (device -> ux_device_address != 0)
{
/* The USB address of this device can now be returned to the pool
We need the HCD pointer for this operation. */
/* Calculate in which byte index the device address belongs. */
device_address_byte_index = (UINT) (device -> ux_device_address-1)/8;
/* Now calculate the amount left in the byte index in bit. */
device_address_bit_index = (UINT) (device -> ux_device_address-1)%8;
/* Build the mask for the address. */
device_address_byte = (UCHAR)(1 << device_address_bit_index);
/* Free the address. */
hcd -> ux_hcd_address[device_address_byte_index] &= (UCHAR)~device_address_byte;
}
#endif
/* The semaphore for endpoint 0 protection must be destroyed. */
_ux_host_semaphore_delete(&device -> ux_device_protection_semaphore);
/* Now this device can be free and its container return to the pool. */
#if defined(UX_HOST_STANDALONE)
enum_next = device -> ux_device_enum_next;
_ux_utility_memory_set(device, 0, sizeof(UX_DEVICE)); /* Use case of memset is verified. */
device -> ux_device_enum_next = enum_next;
#else
_ux_utility_memory_set(device, 0, sizeof(UX_DEVICE)); /* Use case of memset is verified. */
#endif
/* Mark the device handle as unused. */
device -> ux_device_handle = UX_UNUSED;
/* Return successful completion. */
return(UX_SUCCESS);
}
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