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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 RNDIS Class */
/** */
/**************************************************************************/
/**************************************************************************/
#define UX_SOURCE_CODE
/* Include necessary system files. */
#include "ux_api.h"
#include "ux_device_class_rndis.h"
#include "ux_device_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_device_class_rndis_write PORTABLE C */
/* 6.1.11 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function writes a packet into a queue for later thread */
/* processing. */
/* */
/* INPUT */
/* */
/* rndis Address of rndis class */
/* instance */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _ux_device_mutex_on Take mutex */
/* _ux_device_mutex_off Free mutex */
/* _ux_device_event_flags_set Set event flags */
/* */
/* CALLED BY */
/* */
/* ThreadX */
/* */
/**************************************************************************/
UINT _ux_device_class_rndis_write(VOID *rndis_class, NX_PACKET *packet)
{
#if defined(UX_DEVICE_STANDALONE)
UX_PARAMETER_NOT_USED(rndis_class);
UX_PARAMETER_NOT_USED(packet);
return(UX_FUNCTION_NOT_SUPPORTED);
#else
NX_PACKET *current_packet;
NX_PACKET *next_packet;
UX_SLAVE_CLASS_RNDIS *rndis;
/* Proper class casting. */
rndis = (UX_SLAVE_CLASS_RNDIS *) rndis_class;
/* Protect this thread. */
_ux_device_mutex_on(&rndis -> ux_slave_class_rndis_mutex);
/* Check the queue. See if there is something that is being sent. */
if (rndis -> ux_slave_class_rndis_xmit_queue == UX_NULL)
/* Memorize this packet at the beginning of the queue. */
rndis -> ux_slave_class_rndis_xmit_queue = packet;
else
{
/* We get here when there is something in the queue. */
current_packet = rndis -> ux_slave_class_rndis_xmit_queue;
/* Get the next packet associated with the first packet. */
next_packet = current_packet -> nx_packet_queue_next;
/* Parse the current chain for the end. */
while (next_packet != NX_NULL)
{
/* Remember the current packet. */
current_packet = next_packet;
/* See what the next packet in the chain is. */
next_packet = current_packet -> nx_packet_queue_next;
}
/* Memorize the packet to be sent. */
current_packet -> nx_packet_queue_next = packet;
}
/* Free Mutex resource. */
_ux_device_mutex_off(&rndis -> ux_slave_class_rndis_mutex);
/* The packet to be sent is the last in the chain. */
packet -> nx_packet_queue_next = NX_NULL;
/* Set an event to wake up the bulkin thread. */
_ux_device_event_flags_set(&rndis -> ux_slave_class_rndis_event_flags_group, UX_DEVICE_CLASS_RNDIS_NEW_BULKIN_EVENT, UX_OR);
/* We are done here. */
return(UX_SUCCESS);
#endif
}
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