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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <Max3421e.h>
#include <Usb.h>
#include <AndroidAccessory.h>
#define USB_ACCESSORY_VENDOR_ID 0x18D1
#define USB_ACCESSORY_PRODUCT_ID 0x2D00
#define USB_ACCESSORY_ADB_PRODUCT_ID 0x2D01
#define ACCESSORY_STRING_MANUFACTURER 0
#define ACCESSORY_STRING_MODEL 1
#define ACCESSORY_STRING_DESCRIPTION 2
#define ACCESSORY_STRING_VERSION 3
#define ACCESSORY_STRING_URI 4
#define ACCESSORY_STRING_SERIAL 5
#define ACCESSORY_GET_PROTOCOL 51
#define ACCESSORY_SEND_STRING 52
#define ACCESSORY_START 53
AndroidAccessory::AndroidAccessory(const char *manufacturer,
const char *model,
const char *description,
const char *version,
const char *uri,
const char *serial) : manufacturer(manufacturer),
model(model),
description(description),
version(version),
uri(uri),
serial(serial),
connected(false)
{
}
void AndroidAccessory::powerOn(void)
{
max.powerOn();
delay(200);
}
int AndroidAccessory::getProtocol(byte addr)
{
uint16_t protocol = -1;
usb.ctrlReq(addr, 0,
USB_SETUP_DEVICE_TO_HOST |
USB_SETUP_TYPE_VENDOR |
USB_SETUP_RECIPIENT_DEVICE,
ACCESSORY_GET_PROTOCOL, 0, 0, 0, 2, (char *)&protocol);
return protocol;
}
void AndroidAccessory::sendString(byte addr, int index, const char *str)
{
usb.ctrlReq(addr, 0,
USB_SETUP_HOST_TO_DEVICE |
USB_SETUP_TYPE_VENDOR |
USB_SETUP_RECIPIENT_DEVICE,
ACCESSORY_SEND_STRING, 0, 0, index,
strlen(str) + 1, (char *)str);
}
bool AndroidAccessory::switchDevice(byte addr)
{
int protocol = getProtocol(addr);
if (protocol == 1) {
Serial.print("device supports protcol 1\n");
} else {
Serial.print("could not read device protocol version\n");
return false;
}
sendString(addr, ACCESSORY_STRING_MANUFACTURER, manufacturer);
sendString(addr, ACCESSORY_STRING_MODEL, model);
sendString(addr, ACCESSORY_STRING_DESCRIPTION, description);
sendString(addr, ACCESSORY_STRING_VERSION, version);
sendString(addr, ACCESSORY_STRING_URI, uri);
sendString(addr, ACCESSORY_STRING_SERIAL, serial);
usb.ctrlReq(addr, 0,
USB_SETUP_HOST_TO_DEVICE |
USB_SETUP_TYPE_VENDOR |
USB_SETUP_RECIPIENT_DEVICE,
ACCESSORY_START, 0, 0, 0, 0, NULL);
while (usb.getUsbTaskState() != USB_DETACHED_SUBSTATE_WAIT_FOR_DEVICE) {
max.Task();
usb.Task();
}
return true;
}
// Finds the first bulk IN and bulk OUT endpoints
bool AndroidAccessory::findEndpoints(byte addr, EP_RECORD *inEp, EP_RECORD *outEp)
{
int len;
byte err;
uint8_t *p;
err = usb.getConfDescr(addr, 0, 4, 0, (char *)descBuff);
if (err) {
Serial.print("Can't get config descriptor length\n");
return false;
}
len = descBuff[2] | ((int)descBuff[3] << 8);
if (len > sizeof(descBuff)) {
Serial.print("config descriptor too large\n");
/* might want to truncate here */
return false;
}
err = usb.getConfDescr(addr, 0, len, 0, (char *)descBuff);
if (err) {
Serial.print("Can't get config descriptor\n");
return false;
}
p = descBuff;
inEp->epAddr = 0;
outEp->epAddr = 0;
while (p < (descBuff + len)){
uint8_t descLen = p[0];
uint8_t descType = p[1];
USB_ENDPOINT_DESCRIPTOR *epDesc;
EP_RECORD *ep;
switch (descType) {
case USB_DESCRIPTOR_CONFIGURATION:
Serial.print("config desc\n");
break;
case USB_DESCRIPTOR_INTERFACE:
Serial.print("interface desc\n");
break;
case USB_DESCRIPTOR_ENDPOINT:
epDesc = (USB_ENDPOINT_DESCRIPTOR *)p;
if (!inEp->epAddr && (epDesc->bEndpointAddress & 0x80))
ep = inEp;
else if (!outEp->epAddr)
ep = outEp;
else
ep = NULL;
if (ep) {
ep->epAddr = epDesc->bEndpointAddress & 0x7f;
ep->Attr = epDesc->bmAttributes;
ep->MaxPktSize = epDesc->wMaxPacketSize;
ep->sndToggle = bmSNDTOG0;
ep->rcvToggle = bmRCVTOG0;
}
break;
default:
Serial.print("unkown desc type ");
Serial.println( descType, HEX);
break;
}
p += descLen;
}
if (!(inEp->epAddr && outEp->epAddr))
Serial.println("can't find accessory endpoints");
return inEp->epAddr && outEp->epAddr;
}
bool AndroidAccessory::configureAndroid(void)
{
byte err;
EP_RECORD inEp, outEp;
if (!findEndpoints(1, &inEp, &outEp))
return false;
memset(&epRecord, 0x0, sizeof(epRecord));
epRecord[inEp.epAddr] = inEp;
if (outEp.epAddr != inEp.epAddr)
epRecord[outEp.epAddr] = outEp;
in = inEp.epAddr;
out = outEp.epAddr;
Serial.println(inEp.epAddr, HEX);
Serial.println(outEp.epAddr, HEX);
epRecord[0] = *(usb.getDevTableEntry(0,0));
usb.setDevTableEntry(1, epRecord);
err = usb.setConf( 1, 0, 1 );
if (err) {
Serial.print("Can't set config to 1\n");
return false;
}
usb.setUsbTaskState( USB_STATE_RUNNING );
return true;
}
bool AndroidAccessory::isConnected(void)
{
USB_DEVICE_DESCRIPTOR *devDesc = (USB_DEVICE_DESCRIPTOR *) descBuff;
byte err;
max.Task();
usb.Task();
if (!connected &&
usb.getUsbTaskState() >= USB_STATE_CONFIGURING &&
usb.getUsbTaskState() != USB_STATE_RUNNING) {
Serial.print("\nDevice addressed... ");
Serial.print("Requesting device descriptor.\n");
err = usb.getDevDescr(1, 0, 0x12, (char *) devDesc);
if (err) {
Serial.print("\nDevice descriptor cannot be retrieved. Trying again\n");
return false;
}
if (isAccessoryDevice(devDesc)) {
Serial.print("found android acessory device\n");
connected = configureAndroid();
} else {
Serial.print("found possible device. swithcing to serial mode\n");
switchDevice(1);
}
} else if (usb.getUsbTaskState() == USB_DETACHED_SUBSTATE_WAIT_FOR_DEVICE) {
if (connected)
Serial.println("disconnect\n");
connected = false;
}
return connected;
}
int AndroidAccessory::read(void *buff, int len, unsigned int nakLimit)
{
return usb.newInTransfer(1, in, len, (char *)buff, nakLimit);
}
int AndroidAccessory::write(void *buff, int len)
{
usb.outTransfer(1, out, len, (char *)buff);
return len;
}