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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 Video Class */
/** */
/**************************************************************************/
/**************************************************************************/
#define UX_SOURCE_CODE
/* Include necessary system files. */
#include "ux_api.h"
#include "ux_device_class_video.h"
#include "ux_device_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_device_class_video_change PORTABLE C */
/* 6.3.0 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function changes the interface of the Video device */
/* */
/* INPUT */
/* */
/* command Pointer to video command */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_system_error_handler System error trap */
/* */
/* CALLED BY */
/* */
/* Device Video Class */
/* */
/**************************************************************************/
UINT _ux_device_class_video_change(UX_SLAVE_CLASS_COMMAND *command)
{
UX_DEVICE_CLASS_VIDEO *video;
UX_DEVICE_CLASS_VIDEO_STREAM *stream;
UX_SLAVE_CLASS *class_ptr;
UX_SLAVE_INTERFACE *interface_ptr;
UX_SLAVE_ENDPOINT *endpoint;
UCHAR *payload_buffer;
ULONG stream_index;
/* Get the class container. */
class_ptr = command -> ux_slave_class_command_class_ptr;
/* Get the class instance in the container. */
video = (UX_DEVICE_CLASS_VIDEO *) class_ptr -> ux_slave_class_instance;
/* Get the interface that owns this instance. */
interface_ptr = (UX_SLAVE_INTERFACE *) command -> ux_slave_class_command_interface;
/* Get the interface number (base 0). */
if (video -> ux_device_class_video_interface)
{
/* If IAD used, calculate stream index based on interface number. */
stream_index = interface_ptr -> ux_slave_interface_descriptor.bInterfaceNumber;
stream_index -= video -> ux_device_class_video_interface -> ux_slave_interface_descriptor.bInterfaceNumber;
stream_index --;
}
else
/* One stream for one driver! */
stream_index = 0;
/* Get the stream instance. */
stream = &video -> ux_device_class_video_streams[stream_index];
/* Update the interface. */
stream -> ux_device_class_video_stream_interface = interface_ptr;
/* 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)
{
/* Locate the endpoints. ISO IN/OUT for Streaming Interface. */
endpoint = interface_ptr -> ux_slave_interface_first_endpoint;
/* Parse all endpoints. */
stream -> ux_device_class_video_stream_endpoint = UX_NULL;
while (endpoint != UX_NULL)
{
/* Check the endpoint. */
if ((endpoint -> ux_slave_endpoint_descriptor.bmAttributes & UX_MASK_ENDPOINT_TYPE) == UX_ISOCHRONOUS_ENDPOINT)
{
/* We found the endpoint, check its size. */
if (endpoint -> ux_slave_endpoint_transfer_request.ux_slave_transfer_request_transfer_length >
(stream -> ux_device_class_video_stream_payload_buffer_size - 4))
{
/* Error trap! */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_MEMORY_INSUFFICIENT);
/* payload buffer too small for endpoints. */
return(UX_MEMORY_INSUFFICIENT);
}
/* Save it. */
stream -> ux_device_class_video_stream_endpoint = endpoint;
break;
}
/* Next endpoint. */
endpoint = endpoint -> ux_slave_endpoint_next_endpoint;
}
/* Now check if all endpoints have been found. */
if (stream -> ux_device_class_video_stream_endpoint == UX_NULL)
{
/* Error trap! */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_DESCRIPTOR_CORRUPTED);
/* Not all endpoints have been found. Major error, do not proceed. */
return(UX_DESCRIPTOR_CORRUPTED);
}
#if defined(UX_DEVICE_STANDALONE)
/* Reset background transfer state. */
stream -> ux_device_class_video_stream_task_state = UX_STATE_RESET;
#endif
/* Now reset payload buffer error count. */
stream -> ux_device_class_video_stream_buffer_error_count = 0;
/* Now reset payload buffers. */
payload_buffer = stream -> ux_device_class_video_stream_buffer;
while(payload_buffer < stream -> ux_device_class_video_stream_buffer + stream -> ux_device_class_video_stream_buffer_size)
{
/* Reset header information. */
*((ULONG *) payload_buffer ) = 0;
/* Next. */
payload_buffer += stream -> ux_device_class_video_stream_payload_buffer_size;
}
stream -> ux_device_class_video_stream_transfer_pos = stream -> ux_device_class_video_stream_access_pos;
}
else
{
/* There is no data endpoint. */
stream -> ux_device_class_video_stream_endpoint = UX_NULL;
/* In this case, we are reverting to the Alternate Setting 0. We need to terminate the pending transactions. */
/* Endpoints actually aborted and destroyed before change command. */
/*
_ux_device_stack_transfer_all_request_abort(stream -> ux_device_class_video_stream_endpoint, UX_TRANSFER_APPLICATION_RESET);
*/
}
/* Invoke stream change callback. */
if (stream -> ux_device_class_video_stream_callbacks.ux_device_class_video_stream_change)
stream -> ux_device_class_video_stream_callbacks.ux_device_class_video_stream_change(stream, interface_ptr -> ux_slave_interface_descriptor.bAlternateSetting);
/* Return completion status. */
return(UX_SUCCESS);
}
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