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btuart_bcsp.h

/* 
   BlueCore Serial Protocol (BCSP) for Linux Bluetooth stack (BlueZ).
   Copyright 2002 by Fabrizio Gennari <fabrizio.gennari@philips.com>

   Based on
       hci_h4.c  by Maxim Krasnyansky <maxk@qualcomm.com>
       ABCSP     by Carl Orsborn <cjo@csr.com>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 as
   published by the Free Software Foundation;

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
   IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
   CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 
   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 
   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

   ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 
   COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 
   SOFTWARE IS DISCLAIMED.
*/

/* 
 * $Id: btuart_bcsp.h,v 1.5 2003/02/18 11:00:49 kds Exp $
 * 
 * Fixes & Improvements by Dmitry Kasatkin
 * - Aknownledgement fix
 * - Link Establishment
 */

#ifndef __BTUART_BCSP_H__
#define __BTUART_BCSP_H__

#define hci_uart  btuart_t


#define BCSP_TXWINSIZE  4

#define BCSP_ACK_PKT    0x05
#define BCSP_LE_PKT     0x06

typedef struct {
      u8    flags;
#if defined(__LITTLE_ENDIAN_BITFIELD)
      u8    protocol:4;
      u16   length:12;
#elif defined(__BIG_ENDIAN_BITFIELD)
      /* ??? */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
      u8    checksum;
} __attribute__ ((packed)) bcsp_hdr_t;

struct bcsp_struct {
      struct sk_buff_head unack;    /* Unack'ed packets queue */
      struct sk_buff_head rel;      /* Reliable packets queue */
      struct sk_buff_head unrel;    /* Unreliable packets queue */

      unsigned long rx_count;
      struct  sk_buff *rx_skb;
      u8      rxseq_txack;          /* rxseq == txack. */
      u8      rxack;                /* Last packet sent by us that the peer ack'ed */
      struct  timer_list tbcsp;
      
      enum {
            BCSP_W4_PKT_DELIMITER,
            BCSP_W4_PKT_START,
            BCSP_W4_BCSP_HDR,
            BCSP_W4_DATA,
            BCSP_W4_CRC
      } rx_state;

      enum {
            BCSP_ESCSTATE_NOESC,
            BCSP_ESCSTATE_ESC
      } rx_esc_state;

      u16     message_crc;
      u8      txack_req;            /* Do we need to send ack's to the peer? */

      /* Reliable packet sequence number - used to assign seq to each rel pkt. */
      u8      msgq_txseq;

      /* extra configuration stuff /kds */
      enum {
            BCSP_STATE_SHY,
            BCSP_STATE_CURIOUS,
            BCSP_STATE_GARRULOUS
      } state;
      int   conf_count;
};

/* ----------- extra stuff ------------ */

int  btuart_init_bcsp(btuart_t *btuart);
void  btuart_uninit_bcsp(btuart_t *btuart);
void btuart_recv_buf_bcsp(btuart_t *, const unsigned char *, int);

int bcsp_enqueue(struct hci_uart *hu, struct sk_buff *skb);
struct sk_buff *bcsp_dequeue(struct hci_uart *hu);
int bcsp_recv(struct hci_uart *hu, void *data, int count);
int bcsp_open(struct hci_uart *hu);
void bcsp_close(struct hci_uart *hu);
int bcsp_send_le_pkt(struct hci_uart *hu, u8 *pkt, unsigned long timeout);

#define conf_count_limit      10
#define Tshy                  HZ
#define Tconf                 HZ

static inline char *bcsp_state(struct bcsp_struct *bcsp)
{
      if (bcsp->state == BCSP_STATE_SHY)
            return "BCSP_STATE_SHY";
      else if (bcsp->state == BCSP_STATE_CURIOUS)
            return "BCSP_STATE_CURRIOUS";
      else if (bcsp->state == BCSP_STATE_GARRULOUS)
            return "BCSP_STATE_GARRULOUS";
      else
            return "BCSP_STATE ->> UNKNOWN";
}

#endif      /* __BTUART_BCSP_H__ */

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