USB_Host_Shield_2.0/adk.cpp

/* Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.

This software may be distributed and modified under the terms of the GNU
General Public License version 2 (GPL2) as published by the Free Software
Foundation and appearing in the file GPL2.TXT included in the packaging of
this file. Please note that GPL2 Section 2[b] requires that all works based
on this software must also be made publicly available under the terms of
the GPL2 ("Copyleft").

Contact information
-------------------

Circuits At Home, LTD
Web      :  http://www.circuitsathome.com
e-mail   :  support@circuitsathome.com
 */

/* Google ADK interface */

#include "adk.h"

const uint8_t ADK::epDataInIndex = 1;
const uint8_t ADK::epDataOutIndex = 2;

ADK::ADK(USB *p, const char* manufacturer,
        const char* model,
        const char* description,
        const char* version,
        const char* uri,
        const char* serial) :

/* ADK ID Strings */

manufacturer(manufacturer),
model(model),
description(description),
version(version),
uri(uri),
serial(serial),
pUsb(p), //pointer to USB class instance - mandatory
bAddress(0), //device address - mandatory
bConfNum(0), //configuration number
bNumEP(1), //if config descriptor needs to be parsed
ready(false) {
        // initialize endpoint data structures
        for (uint8_t i = 0; i < ADK_MAX_ENDPOINTS; i++) {
                epInfo[i].epAddr = 0;
                epInfo[i].maxPktSize = (i) ? 0 : 8;
                epInfo[i].epAttribs = (0xfc & (USB_NAK_MAX_POWER << 2));
        }//for(uint8_t i=0; i<ADK_MAX_ENDPOINTS; i++...

        //set bulk-IN EP naklimit to 1
        epInfo[epDataInIndex].epAttribs = (0xfc & (USB_NAK_NOWAIT << 2));

        // register in USB subsystem
        if (pUsb) {
                pUsb->RegisterDeviceClass(this); //set devConfig[] entry
        }
}

/* Connection initialization of an Android phone */
uint8_t ADK::Init(uint8_t parent, uint8_t port, bool lowspeed) {

        uint8_t buf[sizeof (USB_DEVICE_DESCRIPTOR)];
        uint8_t rcode;
        UsbDevice *p = NULL;
        EpInfo *oldep_ptr = NULL;
        uint8_t num_of_conf; // number of configurations

        // get memory address of USB device address pool
        AddressPool &addrPool = pUsb->GetAddressPool();

        USBTRACE("\r\nADK Init");

        // check if address has already been assigned to an instance
        if (bAddress) {
                USBTRACE("\r\nAddress in use");
                return USB_ERROR_CLASS_INSTANCE_ALREADY_IN_USE;
        }

        // Get pointer to pseudo device with address 0 assigned
        p = addrPool.GetUsbDevicePtr(0);

        if (!p) {
                USBTRACE("\r\nAddress not found");
                return USB_ERROR_ADDRESS_NOT_FOUND_IN_POOL;
        }

        if (!p->epinfo) {
                USBTRACE("epinfo is null\r\n");
                return USB_ERROR_EPINFO_IS_NULL;
        }

        // Save old pointer to EP_RECORD of address 0
        oldep_ptr = p->epinfo;

        // Temporary assign new pointer to epInfo to p->epinfo in order to avoid toggle inconsistence
        p->epinfo = epInfo;

        p->lowspeed = lowspeed;

        // Get device descriptor
        rcode = pUsb->getDevDescr(0, 0, sizeof (USB_DEVICE_DESCRIPTOR), (uint8_t*)buf);

        // Restore p->epinfo
        p->epinfo = oldep_ptr;

        if (rcode) {
                goto FailGetDevDescr;
        }

        // Allocate new address according to device class
        bAddress = addrPool.AllocAddress(parent, false, port);

        // Extract Max Packet Size from device descriptor
        epInfo[0].maxPktSize = (uint8_t)((USB_DEVICE_DESCRIPTOR*)buf)->bMaxPacketSize0;

        // Assign new address to the device
        rcode = pUsb->setAddr(0, 0, bAddress);
        if (rcode) {
                p->lowspeed = false;
                addrPool.FreeAddress(bAddress);
                bAddress = 0;
                //USBTRACE2("setAddr:",rcode);
                return rcode;
        }//if (rcode...

        //USBTRACE2("\r\nAddr:", bAddress);

        p->lowspeed = false;

        //get pointer to assigned address record
        p = addrPool.GetUsbDevicePtr(bAddress);
        if (!p) {
                return USB_ERROR_ADDRESS_NOT_FOUND_IN_POOL;
        }

        p->lowspeed = lowspeed;

        // Assign epInfo to epinfo pointer - only EP0 is known
        rcode = pUsb->setEpInfoEntry(bAddress, 1, epInfo);
        if (rcode) {
                goto FailSetDevTblEntry;
        }

        //check if ADK device is already in accessory mode; if yes, configure and exit
        if (((USB_DEVICE_DESCRIPTOR*)buf)->idVendor == ADK_VID &&
                (((USB_DEVICE_DESCRIPTOR*)buf)->idProduct == ADK_PID || ((USB_DEVICE_DESCRIPTOR*)buf)->idProduct == ADB_PID)) {
                USBTRACE("\r\nAcc.mode device detected");
                /* go through configurations, find first bulk-IN, bulk-OUT EP, fill epInfo and quit */
                num_of_conf = ((USB_DEVICE_DESCRIPTOR*)buf)->bNumConfigurations;

                //USBTRACE2("\r\nNC:",num_of_conf);

                for (uint8_t i = 0; i < num_of_conf; i++) {
                        ConfigDescParser < 0, 0, 0, 0 > confDescrParser(this);
                        rcode = pUsb->getConfDescr(bAddress, 0, i, &confDescrParser);
                        if (rcode) {
                                goto FailGetConfDescr;
                        }
                        if (bNumEP > 2) {
                                break;
                        }
                } // for (uint8_t i=0; i<num_of_conf; i++...

                if (bNumEP == 3) {
                        // Assign epInfo to epinfo pointer - this time all 3 endpoins
                        rcode = pUsb->setEpInfoEntry(bAddress, 3, epInfo);
                        if (rcode) {
                                goto FailSetDevTblEntry;
                        }
                }



                // Set Configuration Value
                rcode = pUsb->setConf(bAddress, 0, bConfNum);
                if (rcode) {
                        goto FailSetConf;
                }
                /* print endpoint structure */
                //		          USBTRACE("\r\nEndpoint Structure:");
                //		          USBTRACE("\r\nEP0:");
                //		          USBTRACE2("\r\nAddr: ", epInfo[0].epAddr );
                //	            USBTRACE2("\r\nMax.pkt.size: ", epInfo[0].maxPktSize );
                //	            USBTRACE2("\r\nAttr: ", epInfo[0].epAttribs );
                //	            USBTRACE("\r\nEpout:");
                //		          USBTRACE2("\r\nAddr: ", epInfo[epDataOutIndex].epAddr );
                //	            USBTRACE2("\r\nMax.pkt.size: ", epInfo[epDataOutIndex].maxPktSize );
                //	            USBTRACE2("\r\nAttr: ", epInfo[epDataOutIndex].epAttribs );
                //	            USBTRACE("\r\nEpin:");
                //		          USBTRACE2("\r\nAddr: ", epInfo[epDataInIndex].epAddr );
                //	            USBTRACE2("\r\nMax.pkt.size: ", epInfo[epDataInIndex].maxPktSize );
                //	            USBTRACE2("\r\nAttr: ", epInfo[epDataInIndex].epAttribs );

                USBTRACE("\r\nConfiguration successful");
                ready = true;
                return 0; //successful configuration
        }//if( buf->idVendor == ADK_VID...

        //probe device - get accessory protocol revision
        {
                uint16_t adkproto = -1;
                rcode = getProto((uint8_t*) & adkproto);
                if (rcode) {
                        goto FailGetProto; //init fails
                }
                USBTRACE2("\r\nADK protocol rev. ", adkproto);
        }

        //sending ID strings
        sendStr(ACCESSORY_STRING_MANUFACTURER, manufacturer);
        sendStr(ACCESSORY_STRING_MODEL, model);
        sendStr(ACCESSORY_STRING_DESCRIPTION, description);
        sendStr(ACCESSORY_STRING_VERSION, version);
        sendStr(ACCESSORY_STRING_URI, uri);
        sendStr(ACCESSORY_STRING_SERIAL, serial);

        //switch to accessory mode
        //the Android phone will reset
        rcode = switchAcc();
        if (rcode) {
                goto FailSwAcc; //init fails
        }
        rcode = -1;
        goto SwAttempt; //switch to accessory mode attempted

        /* diagnostic messages */
FailGetDevDescr:
        USBTRACE("\r\ngetDevDescr:");
        goto Fail;

FailSetDevTblEntry:
        USBTRACE("\r\nsetDevTblEn:");
        goto Fail;

FailGetProto:
        USBTRACE("\r\ngetProto:");
        goto Fail;

FailSwAcc:
        USBTRACE("\r\nswAcc:");
        goto Fail;

SwAttempt:
        USBTRACE("\r\nAccessory mode switch attempt");
        goto Fail;

FailGetConfDescr:
        //	USBTRACE("getConf:");
        goto Fail;
        //
FailSetConf:
        //	USBTRACE("setConf:");
        goto Fail;
        //
        //FailOnInit:
        //	USBTRACE("OnInit:");
        //	goto Fail;
        //
Fail:
        //USBTRACE2("\r\nADK Init Failed, error code: ", rcode);
        Release();
        return rcode;
}

/* Extracts bulk-IN and bulk-OUT endpoint information from config descriptor */
void ADK::EndpointXtract(uint8_t conf, uint8_t iface, uint8_t alt, uint8_t proto, const USB_ENDPOINT_DESCRIPTOR *pep) {
        //ErrorMessage<uint8_t>(PSTR("Conf.Val"),	conf);
        //ErrorMessage<uint8_t>(PSTR("Iface Num"),iface);
        //ErrorMessage<uint8_t>(PSTR("Alt.Set"),	alt);

        //added by Yuuichi Akagawa
        if (bNumEP == 3) {
                return;
        }

        bConfNum = conf;

        uint8_t index;

        //	if ((pep->bmAttributes & 0x02) == 2) {
        index = ((pep->bEndpointAddress & 0x80) == 0x80) ? epDataInIndex : epDataOutIndex;
        //  }

        // Fill in the endpoint info structure
        epInfo[index].epAddr = (pep->bEndpointAddress & 0x0F);
        epInfo[index].maxPktSize = (uint8_t)pep->wMaxPacketSize;

        bNumEP++;

        //PrintEndpointDescriptor(pep);
}

/* Performs a cleanup after failed Init() attempt */
uint8_t ADK::Release() {
        pUsb->GetAddressPool().FreeAddress(bAddress);

        bNumEP = 1; //must have to be reset to 1

        bAddress = 0;
        ready = false;
        return 0;
}

uint8_t ADK::RcvData(uint16_t *bytes_rcvd, uint8_t *dataptr) {
        //USBTRACE2("\r\nAddr: ", bAddress );
        //USBTRACE2("\r\nEP: ",epInfo[epDataInIndex].epAddr);
        return pUsb->inTransfer(bAddress, epInfo[epDataInIndex].epAddr, bytes_rcvd, dataptr);
}

uint8_t ADK::SndData(uint16_t nbytes, uint8_t *dataptr) {
        return pUsb->outTransfer(bAddress, epInfo[epDataOutIndex].epAddr, nbytes, dataptr);
}

void ADK::PrintEndpointDescriptor(const USB_ENDPOINT_DESCRIPTOR* ep_ptr) {
        Notify(PSTR("Endpoint descriptor:"), 0x80);
        Notify(PSTR("\r\nLength:\t\t"), 0x80);
        PrintHex<uint8_t > (ep_ptr->bLength, 0x80);
        Notify(PSTR("\r\nType:\t\t"), 0x80);
        PrintHex<uint8_t > (ep_ptr->bDescriptorType, 0x80);
        Notify(PSTR("\r\nAddress:\t"), 0x80);
        PrintHex<uint8_t > (ep_ptr->bEndpointAddress, 0x80);
        Notify(PSTR("\r\nAttributes:\t"), 0x80);
        PrintHex<uint8_t > (ep_ptr->bmAttributes, 0x80);
        Notify(PSTR("\r\nMaxPktSize:\t"), 0x80);
        PrintHex<uint16_t > (ep_ptr->wMaxPacketSize, 0x80);
        Notify(PSTR("\r\nPoll Intrv:\t"), 0x80);
        PrintHex<uint8_t > (ep_ptr->bInterval, 0x80);
        Notify(PSTR("\r\n"), 0x80);
}