blue.h

blue-usu: (Search, Connect, Playback, Record) with bluetooth devices like headset. Rely on usu dr

/*
 * blue.h
 *
 * Author : Lionetti Salvatore <[e-mail]>
 * License: GPL
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#ifndef __BLUE_H_
#define __BLUE_H_
/* Redundant parameter.
#undef LITTLE_ENDIAN
#define  BIG_ENDIAN*/

/* Module parameter.*/
#define MAX_PENDING_CMD_CLASSA 1 
#define MAX_PENDING_CMD_CLASSB 10
#define MAX_PDU_LEN 2570 /* Bytes, either4 cmd,event.
			   readRemoteName=255+2*/

/* 1) ALWAY CAN EXIST A SPURIOUS PARAMETER, SW MUST BE ROBUST.
 * 2) TEST WITH TWO CONNECT REQUEST IN QUEUE (4 A MAC role)
 */
#define MAX_PENDING_CMD MAX_PENDING_CMD_CLASSA+MAX_PENDING_CMD_CLASSB
struct hciCmd {
	short int cmd;
	unsigned char len;
};
struct hciEvt {
	unsigned char evt;
	unsigned char len;
};

/* 
 * This class support trasition from null->info->info ...
 * null mean no info.
 */
class PossibleNullValue {
	bool stato;

public:
	PossibleNullValue() {stato=false;}
	bool isNull() {return stato;}
	bool haveValue() {bool oldS=stato; stato=true; return oldS;}
};
/* HciReqRes: take care of build a request on a (char*, len)
 *            and is be able to find his response/responses.
 *
 * Write, read command
 * hci<----> HciReqRes1
 * 	 |
 * 	 |-> HciReqRes2
 * 	 |
 * 	 |-> HciReqRes3
 *
 *
 * Only 1 consume data, like a puzzle.
 * So we need inverse communication (i see if ok then send 'consumeThis'2hci
 * or use model (shared info, hci what i want)
 *
 * So instead of use count: 1 shared object, N user,
 * 			    N User decide when destroy object.
 * we use atexit() f()    : 1 stack/heap object, on destructor do all work
 * 			    User can't do any work after destr.
 * 			    1 object decide when start/stop.
 */ 
struct HciReqRes {
	char *req;
	int reqL;
	int reqC; /* indicate current bytes written in req.*/

	char *res;
	int resL;
	int resC; /* indicate current bytes written in req.*/
	
	bool requestOn;
	enum ProtoT {HCI, L2CAP} proto;

	typedef void (*atExitT)(void*,HciReqRes&);
	atExitT atExitF;
	void* atExitP;
public:
	HciReqRes();
	virtual ~HciReqRes();

	bool done();
	enum ProtoT getProto();
	void setProto(enum ProtoT pro);

	/* return:
	 * <0 if we accept response but have error, (requestOn=0)
	 * =0 if we !accept this response (requestOn=1)
	 * >0 if we accept only some bytes of response.
	 *
	 * If buffer req[],res[] exist => default behavior is read/write
	 * in such a buffer.
	 *
	 * Normal behavior:
	 * writeReq() dump request to specified destination.
	 * readRes() dump response from specified source.*/
	virtual int readRes(char* des, int len);
	virtual int writeReq(char* des, int len);

	/* Help compiling request.*/
	int compileReq(char* opt, int len);
	int scanRes(char* opt, int len);

	/* So we enter on this object only with method.
	 * Usefule to change storage class.*/
	int getReqC();
	int getResC();
	void setDone(bool idone);

	void atExit(void*,atExitT);
};
class HciBus {
	int fdCommand;
	int fdEvent;
	int fdDataAsync;
	int fdDataSync;

	char* lastPdu; /*[MAX_PDU_LEN]*/;
	int lastPduL;
	int lastPduC;

	HciReqRes* hcireqres[MAX_PENDING_CMD];
public:
	HciBus();
	~HciBus();

	/* User schedule build pdu. Ignore done().
	 * ret <0 if no space.
	 * prio is used to ensure that some command
	 * are ensured to read/write before other cmd (es sniffer).*/
	int schedule(HciReqRes& hcirr, char classe='b');

	/* Remove (one|all) command from queue so !response is needed.*/
	int clear(HciReqRes& hcirr);
	int clear();
	
	/* Basic handshaking.*/
	int writeHci(char* data,int len);
	int writeHci(int fd);

	/* Sync read: wait to read a complete pdu.
	 * ret>=0 if ok
	 *    <0 if nok
	 */
	int readMsg(HciReqRes::ProtoT proto);

	/* 
	 * 0      , ok model match
	 * -EAGAIN, model !match, retry with another model,
	 */
	int readHci(HciReqRes::ProtoT proto);
	int hci_readEvt();
	int l2cap_readEvt();

	/* Wait 1 message.*/
	int waitRes(int ms, HciReqRes::ProtoT proto);
	int hci_waitRes(int ms);
	int l2cap_waitRes(int ms);
	
	/* Command done with special device = host bluetooth firmware.
	 * Now mac is sufficient to refer to device. List is in appl.*/
	int readMac(char* mac);
	int searchDevice(char mac[][6],char opts[][8], int nMac,int nSec=5);
	int readRemoteName(char* mac, char* opt, char* nome, int nomeL);

	int Dump();
};
/* When message is detroyed.*/
void onMessageDestroy(HciBus* hb, HciReqRes& hcirr);
bool isEmpty(char* str,int len);
enum ConnInitByT {HOST, DEVICE};
class HciConn {
	char mac[6];
	char pin[4];
	char linkkey[16];
	HciBus& hciBus;
	unsigned int hciScoHandle;
	unsigned int hciL2capHandleDst;
	unsigned int hciL2capHandleSrc;
	unsigned int hciHandle;
public:
	HciConn(HciBus& hcib);
	~HciConn();

	/* Return hci handle.*/
	int writeConf();
	
	int connectHci(enum ConnInitByT whoStartConn);
	int connectSco();
	int connectL2cap();
	int disconnectL2cap(int dstHandle, int srcHandle);
	int disconnectHci(int handle);
	int disconnect();

	/* Parameter specific for connectHci.*/
	int getMac(char mac[6]);
	int getPin(char pin[4]);
	int getLinkKey(char lin[16]);

	int setMac(char mac[6]);
	int setPin(char pin[4]);
	int setLinkKey(char lin[16]);
};

#if 0
class BlueDevice {
	char mac[6];
	HciConn *conn;

public:
	BlueDevice(char* mac=NULL, HciConn* conn);
	~BlueDevice();

	void setMac(char* mac);
	void setConn(HciConn conn);

	/* To have list of device.*/
	static int add(BlueDevice* bd);
	static int del(BlueDevice* bd);
};
#endif
#endif