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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_activate PORTABLE C */
/* 6.2.0 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function initializes the USB 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_activate(UX_SLAVE_CLASS_COMMAND *command)
{
UX_SLAVE_DEVICE *device;
UX_SLAVE_INTERFACE *interface_ptr;
UX_SLAVE_CLASS *class_ptr;
UX_SLAVE_INTERFACE *control_interface;
UX_SLAVE_INTERFACE *stream_interface;
UX_DEVICE_CLASS_VIDEO *video;
UX_DEVICE_CLASS_VIDEO_STREAM *stream;
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 device instance. */
device = &_ux_system_slave -> ux_system_slave_device;
video -> ux_device_class_video_device = device;
/* We only support video interface here. */
if (interface_ptr -> ux_slave_interface_descriptor.bInterfaceClass != UX_DEVICE_CLASS_VIDEO_CLASS)
return(UX_NO_CLASS_MATCH);
/* It's control interface? */
if (interface_ptr -> ux_slave_interface_descriptor.bInterfaceSubClass == UX_DEVICE_CLASS_VIDEO_SUBCLASS_CONTROL)
{
/* Store the interface in the class instance. */
video -> ux_device_class_video_interface = interface_ptr;
/* Store the class instance into the interface. */
interface_ptr -> ux_slave_interface_class_instance = (VOID *)video;
}
else
{
/* It's streaming interface. */
stream_interface = interface_ptr;
/* Separate driver for each interface (IAD not used)? */
if (video -> ux_device_class_video_interface == UX_NULL)
{
/* Always use just 1 stream for 1 interface. */
stream_index = 0;
}
/* Re-use the same driver (IAD used)? */
else
{
/* Re-use saved control interface. */
control_interface = video -> ux_device_class_video_interface;
/* Calculate stream index. */
stream_index = stream_interface -> ux_slave_interface_descriptor.bInterfaceNumber;
stream_index -= control_interface -> ux_slave_interface_descriptor.bInterfaceNumber;
stream_index --;
}
/* Sanity check. */
if (stream_index >= video -> ux_device_class_video_streams_nb)
{
/* Error trap! */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_MEMORY_INSUFFICIENT);
return(UX_MEMORY_INSUFFICIENT);
}
/* Locate stream based on interface number. */
stream = &video -> ux_device_class_video_streams[stream_index];
/* Store the interface for the stream. */
stream -> ux_device_class_video_stream_interface = stream_interface;
/* Store the class instance into the interface. */
stream_interface -> ux_slave_interface_class_instance = (VOID *)video;
#if defined(UX_DEVICE_STANDALONE)
/* Reset stream task state. */
stream -> ux_device_class_video_stream_task_state = UX_STATE_RESET;
stream -> ux_device_class_video_stream_task_status = UX_SUCCESS;
#endif
}
/* If there is a activate function call it. */
if (video -> ux_device_class_video_callbacks.ux_slave_class_video_instance_activate != UX_NULL)
{
/* Invoke the application. */
video -> ux_device_class_video_callbacks.ux_slave_class_video_instance_activate(video);
}
/* Return completion status. */
return(UX_SUCCESS);
}
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