236 lines
9.3 KiB
C
236 lines
9.3 KiB
C
/*
|
|
LUFA Library
|
|
Copyright (C) Dean Camera, 2019.
|
|
|
|
dean [at] fourwalledcubicle [dot] com
|
|
www.lufa-lib.org
|
|
*/
|
|
|
|
/*
|
|
Copyright 2019 Dean Camera (dean [at] fourwalledcubicle [dot] com)
|
|
|
|
Permission to use, copy, modify, distribute, and sell this
|
|
software and its documentation for any purpose is hereby granted
|
|
without fee, provided that the above copyright notice appear in
|
|
all copies and that both that the copyright notice and this
|
|
permission notice and warranty disclaimer appear in supporting
|
|
documentation, and that the name of the author not be used in
|
|
advertising or publicity pertaining to distribution of the
|
|
software without specific, written prior permission.
|
|
|
|
The author disclaims all warranties with regard to this
|
|
software, including all implied warranties of merchantability
|
|
and fitness. In no event shall the author be liable for any
|
|
special, indirect or consequential damages or any damages
|
|
whatsoever resulting from loss of use, data or profits, whether
|
|
in an action of contract, negligence or other tortious action,
|
|
arising out of or in connection with the use or performance of
|
|
this software.
|
|
*/
|
|
|
|
/** \file
|
|
*
|
|
* USB Device Configuration Descriptor processing routines, to determine the correct pipe configurations
|
|
* needed to communication with an attached USB device. Descriptors are special computer-readable structures
|
|
* which the host requests upon device enumeration, to determine the device's capabilities and functions.
|
|
*/
|
|
|
|
#include "ConfigDescriptor.h"
|
|
|
|
/** Reads and processes an attached device's descriptors, to determine compatibility and pipe configurations. This
|
|
* routine will read in the entire configuration descriptor, and configure the hosts pipes to correctly communicate
|
|
* with compatible devices.
|
|
*
|
|
* This routine searches for a RNDIS interface descriptor containing bulk data IN and OUT endpoints, and an interrupt event endpoint.
|
|
*
|
|
* \return An error code from the \ref RNDISHost_GetConfigDescriptorDataCodes_t enum.
|
|
*/
|
|
uint8_t ProcessConfigurationDescriptor(void)
|
|
{
|
|
uint8_t ConfigDescriptorData[512];
|
|
void* CurrConfigLocation = ConfigDescriptorData;
|
|
uint16_t CurrConfigBytesRem;
|
|
|
|
USB_Descriptor_Interface_t* RNDISControlInterface = NULL;
|
|
USB_Descriptor_Endpoint_t* DataINEndpoint = NULL;
|
|
USB_Descriptor_Endpoint_t* DataOUTEndpoint = NULL;
|
|
USB_Descriptor_Endpoint_t* NotificationEndpoint = NULL;
|
|
|
|
/* Retrieve the entire configuration descriptor into the allocated buffer */
|
|
switch (USB_Host_GetDeviceConfigDescriptor(1, &CurrConfigBytesRem, ConfigDescriptorData, sizeof(ConfigDescriptorData)))
|
|
{
|
|
case HOST_GETCONFIG_Successful:
|
|
break;
|
|
case HOST_GETCONFIG_InvalidData:
|
|
return InvalidConfigDataReturned;
|
|
case HOST_GETCONFIG_BuffOverflow:
|
|
return DescriptorTooLarge;
|
|
default:
|
|
return ControlError;
|
|
}
|
|
|
|
while (!(DataINEndpoint) || !(DataOUTEndpoint) || !(NotificationEndpoint))
|
|
{
|
|
/* See if we've found a likely compatible interface, and if there is an endpoint within that interface */
|
|
if (!(RNDISControlInterface) ||
|
|
USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
|
|
DComp_NextCDCDataInterfaceEndpoint) != DESCRIPTOR_SEARCH_COMP_Found)
|
|
{
|
|
/* Check if we have already found the control interface's notification endpoint or not */
|
|
if (NotificationEndpoint)
|
|
{
|
|
/* Get the next RNDIS data interface from the configuration descriptor */
|
|
if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
|
|
DComp_NextCDCDataInterface) != DESCRIPTOR_SEARCH_COMP_Found)
|
|
{
|
|
/* Descriptor not found, error out */
|
|
return NoCompatibleInterfaceFound;
|
|
}
|
|
|
|
/* Clear any found endpoints */
|
|
DataINEndpoint = NULL;
|
|
DataOUTEndpoint = NULL;
|
|
}
|
|
else
|
|
{
|
|
/* Get the next RNDIS control interface from the configuration descriptor */
|
|
if (USB_GetNextDescriptorComp(&CurrConfigBytesRem, &CurrConfigLocation,
|
|
DComp_NextCDCControlInterface) != DESCRIPTOR_SEARCH_COMP_Found)
|
|
{
|
|
/* Descriptor not found, error out */
|
|
return NoCompatibleInterfaceFound;
|
|
}
|
|
|
|
/* Save the interface in case we need to refer back to it later */
|
|
RNDISControlInterface = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Interface_t);
|
|
|
|
/* Clear any found endpoints */
|
|
NotificationEndpoint = NULL;
|
|
}
|
|
|
|
/* Skip the remainder of the loop as we have not found an endpoint yet */
|
|
continue;
|
|
}
|
|
|
|
/* Retrieve the endpoint address from the endpoint descriptor */
|
|
USB_Descriptor_Endpoint_t* EndpointData = DESCRIPTOR_PCAST(CurrConfigLocation, USB_Descriptor_Endpoint_t);
|
|
|
|
/* If the endpoint is a IN type endpoint */
|
|
if ((EndpointData->EndpointAddress & ENDPOINT_DIR_MASK) == ENDPOINT_DIR_IN)
|
|
{
|
|
/* Check if the found endpoint is a interrupt or bulk type descriptor */
|
|
if ((EndpointData->Attributes & EP_TYPE_MASK) == EP_TYPE_INTERRUPT)
|
|
NotificationEndpoint = EndpointData;
|
|
else
|
|
DataINEndpoint = EndpointData;
|
|
}
|
|
else
|
|
{
|
|
DataOUTEndpoint = EndpointData;
|
|
}
|
|
}
|
|
|
|
/* Configure the RNDIS data IN pipe */
|
|
Pipe_ConfigurePipe(RNDIS_DATA_IN_PIPE, EP_TYPE_BULK, DataINEndpoint->EndpointAddress, DataINEndpoint->EndpointSize, 1);
|
|
|
|
/* Configure the RNDIS data OUT pipe */
|
|
Pipe_ConfigurePipe(RNDIS_DATA_OUT_PIPE, EP_TYPE_BULK, DataOUTEndpoint->EndpointAddress, DataOUTEndpoint->EndpointSize, 1);
|
|
|
|
/* Configure the RNDIS notification pipe */
|
|
Pipe_ConfigurePipe(RNDIS_NOTIFICATION_PIPE, EP_TYPE_INTERRUPT, NotificationEndpoint->EndpointAddress, NotificationEndpoint->EndpointSize, 1);
|
|
Pipe_SetInterruptPeriod(NotificationEndpoint->PollingIntervalMS);
|
|
|
|
/* Valid data found, return success */
|
|
return SuccessfulConfigRead;
|
|
}
|
|
|
|
/** Descriptor comparator function. This comparator function is can be called while processing an attached USB device's
|
|
* configuration descriptor, to search for a specific sub descriptor. It can also be used to abort the configuration
|
|
* descriptor processing if an incompatible descriptor configuration is found.
|
|
*
|
|
* This comparator searches for the next Interface descriptor of the correct CDC control Class, Subclass and Protocol values.
|
|
*
|
|
* \return A value from the DSEARCH_Return_ErrorCodes_t enum
|
|
*/
|
|
uint8_t DComp_NextCDCControlInterface(void* CurrentDescriptor)
|
|
{
|
|
USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);
|
|
|
|
if (Header->Type == DTYPE_Interface)
|
|
{
|
|
USB_Descriptor_Interface_t* Interface = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Interface_t);
|
|
|
|
/* Check the CDC descriptor class, subclass and protocol, break out if correct control interface found */
|
|
if ((Interface->Class == CDC_CSCP_CDCClass) &&
|
|
(Interface->SubClass == CDC_CSCP_ACMSubclass) &&
|
|
(Interface->Protocol == CDC_CSCP_VendorSpecificProtocol))
|
|
{
|
|
return DESCRIPTOR_SEARCH_Found;
|
|
}
|
|
}
|
|
|
|
return DESCRIPTOR_SEARCH_NotFound;
|
|
}
|
|
|
|
/** Descriptor comparator function. This comparator function is can be called while processing an attached USB device's
|
|
* configuration descriptor, to search for a specific sub descriptor. It can also be used to abort the configuration
|
|
* descriptor processing if an incompatible descriptor configuration is found.
|
|
*
|
|
* This comparator searches for the next Interface descriptor of the correct CDC data Class, Subclass and Protocol values.
|
|
*
|
|
* \return A value from the DSEARCH_Return_ErrorCodes_t enum
|
|
*/
|
|
uint8_t DComp_NextCDCDataInterface(void* CurrentDescriptor)
|
|
{
|
|
USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);
|
|
|
|
if (Header->Type == DTYPE_Interface)
|
|
{
|
|
USB_Descriptor_Interface_t* Interface = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Interface_t);
|
|
|
|
/* Check the CDC descriptor class, subclass and protocol, break out if correct data interface found */
|
|
if ((Interface->Class == CDC_CSCP_CDCDataClass) &&
|
|
(Interface->SubClass == CDC_CSCP_NoDataSubclass) &&
|
|
(Interface->Protocol == CDC_CSCP_NoDataProtocol))
|
|
{
|
|
return DESCRIPTOR_SEARCH_Found;
|
|
}
|
|
}
|
|
|
|
return DESCRIPTOR_SEARCH_NotFound;
|
|
}
|
|
|
|
/** Descriptor comparator function. This comparator function is can be called while processing an attached USB device's
|
|
* configuration descriptor, to search for a specific sub descriptor. It can also be used to abort the configuration
|
|
* descriptor processing if an incompatible descriptor configuration is found.
|
|
*
|
|
* This comparator searches for the next bulk IN or OUT endpoint, or interrupt IN endpoint within the current interface,
|
|
* aborting the search if another interface descriptor is found before the required endpoint (so that it may be compared
|
|
* using a different comparator to determine if it is another CDC class interface).
|
|
*
|
|
* \return A value from the DSEARCH_Return_ErrorCodes_t enum
|
|
*/
|
|
uint8_t DComp_NextCDCDataInterfaceEndpoint(void* CurrentDescriptor)
|
|
{
|
|
USB_Descriptor_Header_t* Header = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Header_t);
|
|
|
|
if (Header->Type == DTYPE_Endpoint)
|
|
{
|
|
USB_Descriptor_Endpoint_t* Endpoint = DESCRIPTOR_PCAST(CurrentDescriptor, USB_Descriptor_Endpoint_t);
|
|
|
|
/* Check the endpoint type, break out if correct BULK or INTERRUPT type endpoint found */
|
|
if (((Endpoint->Attributes & EP_TYPE_MASK) == EP_TYPE_BULK) ||
|
|
((Endpoint->Attributes & EP_TYPE_MASK) == EP_TYPE_INTERRUPT))
|
|
{
|
|
return DESCRIPTOR_SEARCH_Found;
|
|
}
|
|
}
|
|
else if (Header->Type == DTYPE_Interface)
|
|
{
|
|
return DESCRIPTOR_SEARCH_Fail;
|
|
}
|
|
|
|
return DESCRIPTOR_SEARCH_NotFound;
|
|
}
|
|
|