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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** 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_new_endpoint_create PORTABLE C */
/* 6.1.9 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function creates a new endpoint for the current interface */
/* scanned. The endpoint is hooked to the interface that owns it. */
/* It is not active yet until either the default interface for the */
/* configuration is selected by a SET_CONFIGURATION or when an */
/* alternate setting for this interface is set. */
/* */
/* INPUT */
/* */
/* interface Interface container that owns */
/* this endpoint */
/* endpoint_pointer Pointer to a unparsed */
/* endpoint descriptor */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_utility_descriptor_parse Parse the descriptor */
/* _ux_utility_memory_allocate Allocate memory block */
/* */
/* CALLED BY */
/* */
/* USBX Components */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* resulting in version 6.1 */
/* 10-15-2021 Chaoqiong Xiao Modified comment(s), */
/* added descriptor validate, */
/* resulting in version 6.1.9 */
/* */
/**************************************************************************/
UINT _ux_host_stack_new_endpoint_create(UX_INTERFACE *interface,
UCHAR * interface_endpoint)
{
UX_ENDPOINT *endpoint;
UX_ENDPOINT *list_endpoint;
ULONG endpoint_type;
ULONG packet_size;
ULONG n_tran;
/* Obtain memory for storing this new endpoint. */
endpoint = (UX_ENDPOINT *) _ux_utility_memory_allocate(UX_NO_ALIGN, UX_REGULAR_MEMORY, sizeof(UX_ENDPOINT));
if (endpoint == UX_NULL)
return(UX_MEMORY_INSUFFICIENT);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_STACK_NEW_ENDPOINT_CREATE, interface, endpoint, 0, 0, UX_TRACE_HOST_STACK_EVENTS, 0, 0)
/* Save the endpoint handle in the container, this is for ensuring the
endpoint container is not corrupted. */
endpoint -> ux_endpoint = (ULONG) (ALIGN_TYPE) endpoint;
/* The endpoint container has a built in transfer_request.
The transfer_request needs to point to the endpoint as well. */
endpoint -> ux_endpoint_transfer_request.ux_transfer_request_endpoint = endpoint;
/* Save the pointer to the device. This is useful for the HCD layer. */
endpoint -> ux_endpoint_device = interface -> ux_interface_configuration -> ux_configuration_device;
/* Parse the interface descriptor and make it machine independent. */
_ux_utility_descriptor_parse(interface_endpoint,
_ux_system_endpoint_descriptor_structure,
UX_ENDPOINT_DESCRIPTOR_ENTRIES,
(UCHAR *) &endpoint -> ux_endpoint_descriptor);
/* Check endpoint size and interval to see if they are valid. */
endpoint_type = endpoint -> ux_endpoint_descriptor.bmAttributes & UX_MASK_ENDPOINT_TYPE;
/* Endpoint size should not be zero. */
if (endpoint -> ux_endpoint_descriptor.wMaxPacketSize == 0)
{
_ux_utility_memory_free(endpoint);
return(UX_DESCRIPTOR_CORRUPTED);
}
/* Control/bulk endpoint, 8, 16, 32, 64, ... 512 can be accepted.
Note non-standard size in 2^N is accepted since they really works. */
if (endpoint_type == UX_CONTROL_ENDPOINT || endpoint_type == UX_BULK_ENDPOINT)
{
for (packet_size = 8; packet_size <= 512; packet_size <<= 1)
{
if (packet_size == endpoint -> ux_endpoint_descriptor.wMaxPacketSize)
break;
}
/* If endpoint size not valid, return error. */
if (packet_size > 512)
{
_ux_utility_memory_free(endpoint);
return(UX_DESCRIPTOR_CORRUPTED);
}
}
/* Interrupt/isochronous endpoint, max 1024 and 3 transactions can be accepted. */
if (endpoint_type == UX_INTERRUPT_ENDPOINT || endpoint_type == UX_ISOCHRONOUS_ENDPOINT)
{
/* Max size over 1024 is not allowed. */
packet_size = endpoint -> ux_endpoint_descriptor.wMaxPacketSize & UX_MAX_PACKET_SIZE_MASK;
if (packet_size > 1024)
{
_ux_utility_memory_free(endpoint);
return(UX_DESCRIPTOR_CORRUPTED);
}
/* Number transaction over 2 additional is not allowed. */
n_tran = endpoint -> ux_endpoint_descriptor.wMaxPacketSize & UX_MAX_NUMBER_OF_TRANSACTIONS_MASK;
if (n_tran >= UX_MAX_NUMBER_OF_TRANSACTIONS_MASK)
{
_ux_utility_memory_free(endpoint);
return(UX_DESCRIPTOR_CORRUPTED);
}
/* Isochronous/high speed interrupt interval should be 1~16. */
if (endpoint -> ux_endpoint_descriptor.bInterval < 1)
{
_ux_utility_memory_free(endpoint);
return(UX_DESCRIPTOR_CORRUPTED);
}
if ((endpoint_type == UX_ISOCHRONOUS_ENDPOINT) ||
(interface -> ux_interface_configuration -> ux_configuration_device
-> ux_device_speed == UX_HIGH_SPEED_DEVICE)
)
{
if (endpoint -> ux_endpoint_descriptor.bInterval > 16)
{
_ux_utility_memory_free(endpoint);
return(UX_DESCRIPTOR_CORRUPTED);
}
}
/* Save final packet size. */
packet_size *= (n_tran + 1);
}
/* Save transfer packet size. */
endpoint -> ux_endpoint_transfer_request.ux_transfer_request_packet_length = packet_size;
/* The interface that owns this endpoint is memorized in the
endpoint container itself, easier for back chaining. */
endpoint -> ux_endpoint_interface = interface;
/* There is 2 cases for the creation of the endpoint descriptor
if this is the first one, the endpoint descriptor is hooked
to the interface.
If it is not the first one, the endpoint is hooked to the
end of the chain of endpoints. */
if (interface -> ux_interface_first_endpoint == UX_NULL)
{
interface -> ux_interface_first_endpoint = endpoint;
}
else
{
list_endpoint = interface -> ux_interface_first_endpoint;
/* Traverse the list until the end. */
while (list_endpoint -> ux_endpoint_next_endpoint != UX_NULL)
list_endpoint = list_endpoint -> ux_endpoint_next_endpoint;
/* Hook the endpoint. */
list_endpoint -> ux_endpoint_next_endpoint = endpoint;
}
/* Return successful status. */
return(UX_SUCCESS);
}