PluggableUSB.cpp

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/*
  PluggableUSB.cpp
  Copyright (c) 2015 Arduino LLC

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

#include "USBAPI.h"
#include "PluggableUSB.h"

#if defined(USBCON)     
#ifdef PLUGGABLE_USB_ENABLED

extern uint8_t _initEndpoints[];

int PluggableUSB_::getInterface(uint8_t* interfaceCount)
{
        int sent = 0;
        PluggableUSBModule* node;
        for (node = rootNode; node; node = node->next) {
                int res = node->getInterface(interfaceCount);
                if (res < 0)
                        return -1;
                sent += res;
        }
        return sent;
}

int PluggableUSB_::getDescriptor(USBSetup& setup)
{
        PluggableUSBModule* node;
        for (node = rootNode; node; node = node->next) {
                int ret = node->getDescriptor(setup);
                // ret!=0 -> request has been processed
                if (ret)
                        return ret;
        }
        return 0;
}

void PluggableUSB_::getShortName(char *iSerialNum)
{
        PluggableUSBModule* node;
        for (node = rootNode; node; node = node->next) {
                iSerialNum += node->getShortName(iSerialNum);
        }
        *iSerialNum = 0;
}

bool PluggableUSB_::setup(USBSetup& setup)
{
        PluggableUSBModule* node;
        for (node = rootNode; node; node = node->next) {
                if (node->setup(setup)) {
                        return true;
                }
        }
        return false;
}

bool PluggableUSB_::plug(PluggableUSBModule *node)
{
        if ((lastEp + node->numEndpoints) > USB_ENDPOINTS) {
                return false;
        }

        if (!rootNode) {
                rootNode = node;
        } else {
                PluggableUSBModule *current = rootNode;
                while (current->next) {
                        current = current->next;
                }
                current->next = node;
        }

        node->pluggedInterface = lastIf;
        node->pluggedEndpoint = lastEp;
        lastIf += node->numInterfaces;
        for (uint8_t i = 0; i < node->numEndpoints; i++) {
                _initEndpoints[lastEp] = node->endpointType[i];
                lastEp++;
        }
        return true;
        // restart USB layer???
}

PluggableUSB_& PluggableUSB()
{
        static PluggableUSB_ obj;
        return obj;
}

PluggableUSB_::PluggableUSB_() : lastIf(CDC_ACM_INTERFACE + CDC_INTERFACE_COUNT),
                                 lastEp(CDC_FIRST_ENDPOINT + CDC_ENPOINT_COUNT),
                                 rootNode(NULL)
{
        // Empty
}

#endif

#endif /* if defined(USBCON) */