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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 */
/** */
/** Device CDC_ECM Class */
/** */
/**************************************************************************/
/**************************************************************************/
#define UX_SOURCE_CODE
/* Include necessary system files. */
#include "ux_api.h"
#include "ux_device_class_cdc_ecm.h"
#include "ux_device_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_device_class_cdc_ecm_change PORTABLE C */
/* 6.3.0 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function changes the interface of the CDC_ECM device */
/* */
/* INPUT */
/* */
/* command Pointer to cdc_ecm command */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_network_driver_link_up Link status up */
/* _ux_network_driver_link_down Link status down */
/* _ux_utility_memory_set Set memory */
/* _ux_device_thread_resume Resume thread */
/* _ux_device_event_flags_set Set event flags */
/* _ux_device_stack_transfer_all_request_abort */
/* Abort transfer */
/* */
/* CALLED BY */
/* */
/* USBX Source Code */
/* */
/**************************************************************************/
UINT _ux_device_class_cdc_ecm_change(UX_SLAVE_CLASS_COMMAND *command)
{
UX_SLAVE_INTERFACE *interface_ptr;
UX_SLAVE_CLASS *class_ptr;
UX_SLAVE_CLASS_CDC_ECM *cdc_ecm;
UX_SLAVE_ENDPOINT *endpoint;
/* Get the class container. */
class_ptr = command -> ux_slave_class_command_class_ptr;
/* Get the class instance in the container. */
cdc_ecm = (UX_SLAVE_CLASS_CDC_ECM *) class_ptr -> ux_slave_class_instance;
/* Get the interface that owns this instance. */
interface_ptr = (UX_SLAVE_INTERFACE *) command -> ux_slave_class_command_interface;
/* Locate the endpoints. Control and Bulk in/out for Data Interface. */
endpoint = interface_ptr -> ux_slave_interface_first_endpoint;
/* If the interface to mount has a non zero alternate setting, the class is really active with
the endpoints active. If the interface reverts to alternate setting 0, it needs to have
the pending transactions terminated. */
if (interface_ptr -> ux_slave_interface_descriptor.bAlternateSetting != 0)
{
/* Parse all endpoints. */
while (endpoint != UX_NULL)
{
/* Check the endpoint direction, and type. */
if ((endpoint -> ux_slave_endpoint_descriptor.bEndpointAddress & UX_ENDPOINT_DIRECTION) == UX_ENDPOINT_IN)
{
/* Look at type. */
if ((endpoint -> ux_slave_endpoint_descriptor.bmAttributes & UX_MASK_ENDPOINT_TYPE) == UX_BULK_ENDPOINT)
/* We have found the bulk in endpoint, save it. */
cdc_ecm -> ux_slave_class_cdc_ecm_bulkin_endpoint = endpoint;
#if (UX_DEVICE_ENDPOINT_BUFFER_OWNER == 1) && !defined(UX_DEVICE_CLASS_CDC_ECM_ZERO_COPY)
endpoint -> ux_slave_endpoint_transfer_request.
ux_slave_transfer_request_data_pointer =
UX_DEVICE_CLASS_CDC_ECM_BULKIN_BUFFER(cdc_ecm);
#endif
}
else
{
/* Look at type for out endpoint. */
if ((endpoint -> ux_slave_endpoint_descriptor.bmAttributes & UX_MASK_ENDPOINT_TYPE) == UX_BULK_ENDPOINT)
/* We have found the bulk out endpoint, save it. */
cdc_ecm -> ux_slave_class_cdc_ecm_bulkout_endpoint = endpoint;
#if (UX_DEVICE_ENDPOINT_BUFFER_OWNER == 1) && !defined(UX_DEVICE_CLASS_CDC_ECM_ZERO_COPY)
endpoint -> ux_slave_endpoint_transfer_request.
ux_slave_transfer_request_data_pointer =
UX_DEVICE_CLASS_CDC_ECM_BULKOUT_BUFFER(cdc_ecm);
#endif
}
/* Next endpoint. */
endpoint = endpoint -> ux_slave_endpoint_next_endpoint;
}
/* Now check if all endpoints have been found. */
if (cdc_ecm -> ux_slave_class_cdc_ecm_bulkout_endpoint == UX_NULL || cdc_ecm -> ux_slave_class_cdc_ecm_bulkin_endpoint == UX_NULL)
/* Not all endpoints have been found. Major error, do not proceed. */
return(UX_ERROR);
/* Declare the link to be up. */
cdc_ecm -> ux_slave_class_cdc_ecm_link_state = UX_DEVICE_CLASS_CDC_ECM_LINK_STATE_UP;
/* Communicate the state with the network driver. */
_ux_network_driver_link_up(cdc_ecm -> ux_slave_class_cdc_ecm_network_handle);
#if (UX_DEVICE_ENDPOINT_BUFFER_OWNER == 1) && defined(UX_DEVICE_CLASS_CDC_ECM_ZERO_COPY)
/* There is no endpoint buffer. */
#else
/* Reset the endpoint buffers. */
_ux_utility_memory_set(cdc_ecm -> ux_slave_class_cdc_ecm_bulkout_endpoint -> ux_slave_endpoint_transfer_request.
ux_slave_transfer_request_data_pointer, 0, UX_DEVICE_CLASS_CDC_ECM_BULKOUT_BUFFER_SIZE); /* Use case of memset is verified. */
_ux_utility_memory_set(cdc_ecm -> ux_slave_class_cdc_ecm_bulkin_endpoint -> ux_slave_endpoint_transfer_request.
ux_slave_transfer_request_data_pointer, 0, UX_DEVICE_CLASS_CDC_ECM_BULKIN_BUFFER_SIZE); /* Use case of memset is verified. */
#endif
/* Resume the endpoint threads. */
_ux_device_thread_resume(&cdc_ecm -> ux_slave_class_cdc_ecm_bulkout_thread);
_ux_device_thread_resume(&cdc_ecm -> ux_slave_class_cdc_ecm_bulkin_thread);
/* Wake up the Interrupt thread and send a network notification to the host. */
_ux_device_event_flags_set(&cdc_ecm -> ux_slave_class_cdc_ecm_event_flags_group, UX_DEVICE_CLASS_CDC_ECM_NETWORK_NOTIFICATION_EVENT, UX_OR);
/* If there is an activate function call it. */
if (cdc_ecm -> ux_slave_class_cdc_ecm_parameter.ux_slave_class_cdc_ecm_instance_activate != UX_NULL)
/* Invoke the application. */
cdc_ecm -> ux_slave_class_cdc_ecm_parameter.ux_slave_class_cdc_ecm_instance_activate(cdc_ecm);
}
else
{
/* In this case, we are reverting to the Alternate Setting 0. */
/* Declare the link to be down. */
cdc_ecm -> ux_slave_class_cdc_ecm_link_state = UX_DEVICE_CLASS_CDC_ECM_LINK_STATE_DOWN;
/* Communicate the state with the network driver. */
_ux_network_driver_link_down(cdc_ecm -> ux_slave_class_cdc_ecm_network_handle);
/* Terminate the transactions pending on the bulk in endpoint. If there is a transfer on the
bulk out endpoint, we simply let it finish and let NetX throw it away. */
_ux_device_stack_transfer_all_request_abort(cdc_ecm -> ux_slave_class_cdc_ecm_bulkin_endpoint, UX_TRANSFER_APPLICATION_RESET);
/* Notify the thread waiting for network notification events. In this case,
the event is that the link state has been switched to down. */
_ux_device_event_flags_set(&cdc_ecm -> ux_slave_class_cdc_ecm_event_flags_group, UX_DEVICE_CLASS_CDC_ECM_NETWORK_NOTIFICATION_EVENT, UX_OR);
/* Wake up the bulk in thread so that it can clean up the xmit queue. */
_ux_device_event_flags_set(&cdc_ecm -> ux_slave_class_cdc_ecm_event_flags_group, UX_DEVICE_CLASS_CDC_ECM_NEW_DEVICE_STATE_CHANGE_EVENT, UX_OR);
/* If there is a deactivate function call it. */
if (cdc_ecm -> ux_slave_class_cdc_ecm_parameter.ux_slave_class_cdc_ecm_instance_deactivate != UX_NULL)
/* Invoke the application. */
cdc_ecm -> ux_slave_class_cdc_ecm_parameter.ux_slave_class_cdc_ecm_instance_deactivate(cdc_ecm);
}
/* Set the CDC ECM alternate setting to the new one. */
cdc_ecm -> ux_slave_class_cdc_ecm_current_alternate_setting = interface_ptr -> ux_slave_interface_descriptor.bAlternateSetting;
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_DEVICE_CLASS_CDC_ECM_CHANGE, cdc_ecm, 0, 0, 0, UX_TRACE_DEVICE_CLASS_EVENTS, 0, 0)
/* If trace is enabled, register this object. */
UX_TRACE_OBJECT_REGISTER(UX_TRACE_DEVICE_OBJECT_TYPE_INTERFACE, cdc_ecm, 0, 0, 0)
/* Return completion status. */
return(UX_SUCCESS);
}
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