bcsp_mux.c

bluetooth 驱动

/*
 * bcsp_mux.c -- Implementation of the MUX in the BCSP protocol stack
 *
 * Copyright (C) 2001  Axis Communications AB
 *
 * Author: Mats Friden <[e-mail]>
 *
 * 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.
 *
 * Exceptionally, Axis Communications AB grants discretionary and
 * conditional permissions for additional use of the text contained
 * in the company's release of the AXIS OpenBT Stack under the
 * provisions set forth hereunder.
 *
 * Provided that, if you use the AXIS OpenBT Stack with other files,
 * that do not implement functionality as specified in the Bluetooth
 * System specification, to produce an executable, this does not by
 * itself cause the resulting executable to be covered by the GNU
 * General Public License. Your use of that executable is in no way
 * restricted on account of using the AXIS OpenBT Stack code with it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the provisions of the GNU
 * General Public License.
 *
 * $Id: bcsp_mux.c,v 1.10 2001/09/18 13:04:27 pkj Exp $
 *
 */

/****************** INCLUDE FILES SECTION ***********************************/

#define __NO_VERSION__ /* don't define kernel_version in module.h */

#ifdef __KERNEL__
#include <linux/malloc.h>

#include <linux/bluetooth/bcsp.h>
#include <linux/bluetooth/bcsp_debug.h>
#else
#include "include/bcsp.h"
#include "include/bcsp_debug.h"
#endif

/****************** CONSTANT AND MACRO SECTION ******************************/

#if MUX_DEBUG
#define D(fmt...) printk("MUX:       " fmt)
#else
#define D(fmt...)
#endif

/****************** TYPE DEFINITION SECTION *********************************/

/****************** LOCAL FUNCTION DECLARATION SECTION **********************/

/****************** GLOBAL VARIABLE DECLARATION SECTION *********************/

/****************** LOCAL VARIABLE DECLARATION SECTION **********************/

/****************** FUNCTION DEFINITION SECTION *****************************/

s32
bcsp_mux_receive(struct bcsp *bcsp)
{
	/* If we received an ack packet, we discard the packet, sice the ack
	   has already been handled by signal_rxack */

	if (bcsp->identifier == 0) {
		D(__FUNCTION__ ": Received ack, returning\n");
		bcsp_signal_rxack(BCSP_GET_ACK(bcsp));
		return 0;
	}
	
	if (BCSP_GET_PROTOCOL_TYPE(bcsp) == BCSP_RELIABLE) {
		D(__FUNCTION__ ": Sending to sequencing layer\n");
		return bcsp_sequence_receive(bcsp);
	} else if (BCSP_GET_PROTOCOL_TYPE(bcsp) == BCSP_UNRELIABLE) {
		D(__FUNCTION__ ": Sending to datagram layer\n");
		return bcsp_datagram_receive(bcsp);
	} else {
		/* This shouldn't be possible */
		BCSP_SYS(__FUNCTION__ ": Packet is neither reliable nor unreliable\n");
	}
	return 0;
}

s32
bcsp_mux_send(struct bcsp *bcsp)
{
	D(__FUNCTION__ "\n");
	return bcsp_integrity_send(bcsp);
}

s32 bcsp_send_txack(u8 txack)
{
	struct bcsp bcsp;

	D(__FUNCTION__ ": txack: 0x%x\n", txack);

	bcsp_init_packet(&bcsp);
	
	BCSP_SET_ACK(&bcsp, txack);
	BCSP_SET_SEQ(&bcsp, 0);
	bcsp.identifier = 0;  /* According to AN004.pdf page 20 */
	bcsp.payload_length = 0;

	return bcsp_integrity_send(&bcsp);
}

/****************** END OF FILE mux.c ***************************************/