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/* r3964 linediscipline for linux
 *
 * -----------------------------------------------------------
 * Copyright by
 * Philips Automation Projects
 * Kassel (Germany)
 * http://www.pap-philips.de
 * -----------------------------------------------------------
 * This software may be used and distributed according to the terms of
 * the GNU General Public License, incorporated herein by reference.
 *
 * Author:
 * L. Haag
 *
 * $Log: not supported by cvs2svn $
 * Revision 1.3  2001/03/18 13:02:24  dwmw2
 * Fix timer usage, use spinlocks properly.
 *
 * Revision 1.2  2001/03/18 12:53:15  dwmw2
 * Merge changes in 2.4.2
 *
 * Revision 1.1.1.1  1998/10/13 16:43:14  dwmw2
 * This'll screw the version control
 *
 * Revision 1.6  1998/09/30 00:40:38  dwmw2
 * Updated to use kernel's N_R3964 if available
 *
 * Revision 1.4  1998/04/02 20:29:44  lhaag
 * select, blocking, ...
 *
 * Revision 1.3  1998/02/12 18:58:43  root
 * fixed some memory leaks
 * calculation of checksum characters
 *
 * Revision 1.2  1998/02/07 13:03:17  root
 * ioctl read_telegram
 *
 * Revision 1.1  1998/02/06 19:19:43  root
 * Initial revision
 *
 *
 */


#ifndef __LINUX_N_R3964_H__
#define __LINUX_N_R3964_H__

/* line disciplines for r3964 protocol */
#include <asm/termios.h>

#ifdef __KERNEL__
/*
 * Common ascii handshake characters:
 */


#define STX 0x02
#define ETX 0x03
#define DLE 0x10
#define NAK 0x15

/*
 * Timeouts (msecs/10 msecs per timer interrupt):
 */


#define R3964_TO_QVZ 550/10
#define R3964_TO_ZVZ 220/10
#define R3964_TO_NO_BUF 400/10
#define R3964_NO_TX_ROOM 100/10
#define R3964_TO_RX_PANIC 4000/10
#define R3964_MAX_RETRIES 5

#endif

/*
 * Ioctl-commands
 */


#define R3964_ENABLE_SIGNALS      0x5301
#define R3964_SETPRIORITY         0x5302
#define R3964_USE_BCC             0x5303
#define R3964_READ_TELEGRAM       0x5304

/* Options for R3964_SETPRIORITY */
#define R3964_MASTER   0
#define R3964_SLAVE    1

/* Options for R3964_ENABLE_SIGNALS */
#define R3964_SIG_ACK   0x0001
#define R3964_SIG_DATA  0x0002
#define R3964_SIG_ALL   0x000f
#define R3964_SIG_NONE  0x0000
#define R3964_USE_SIGIO 0x1000

/*
 * r3964 operation states:
 */

#ifdef __KERNEL__

enum { R3964_IDLE,
           R3964_TX_REQUEST, R3964_TRANSMITTING,
           R3964_WAIT_ZVZ_BEFORE_TX_RETRY, R3964_WAIT_FOR_TX_ACK,
           R3964_WAIT_FOR_RX_BUF,
           R3964_RECEIVING, R3964_WAIT_FOR_BCC, R3964_WAIT_FOR_RX_REPEAT
           };

/*
 * All open file-handles are 'clients' and are stored in a linked list:
 */


struct r3964_message;

struct r3964_client_info {
        spinlock_t     lock;
        pid_t          pid;
        unsigned int   sig_flags;

        struct r3964_client_info *next;

        struct r3964_message *first_msg;
        struct r3964_message *last_msg;
        struct r3964_block_header *next_block_to_read;
        int            msg_count;
};


#endif

/* types for msg_id: */
enum {R3964_MSG_ACK=1, R3964_MSG_DATA };

#define R3964_MAX_MSG_COUNT 32

/* error codes for client messages */
#define R3964_OK 0        /* no error. */
#define R3964_TX_FAIL -1  /* transmission error, block NOT sent */
#define R3964_OVERFLOW -2 /* msg queue overflow */

/* the client gets this struct when calling read(fd,...): */
struct r3964_client_message {
          int     msg_id;
          int     arg;
          int     error_code;
};

#define R3964_MTU      256


#ifdef __KERNEL__

struct r3964_block_header;

/* internal version of client_message: */
struct r3964_message {
          int     msg_id;
          int     arg;
          int     error_code;
          struct r3964_block_header *block;
          struct r3964_message *next;
};

/*
 * Header of received block in rx_buf/tx_buf:
 */


struct r3964_block_header
{
        unsigned int length;             /* length in chars without header */
        unsigned char *data;             /* usually data is located
                                        immediately behind this struct */

        unsigned int locks;              /* only used in rx_buffer */
         
    struct r3964_block_header *next;
        struct r3964_client_info *owner;  /* =NULL in rx_buffer */
};

/*
 * If rx_buf hasn't enough space to store R3964_MTU chars,
 * we will reject all incoming STX-requests by sending NAK.
 */


#define RX_BUF_SIZE    4000
#define TX_BUF_SIZE    4000
#define R3964_MAX_BLOCKS_IN_RX_QUEUE 100

#define R3964_PARITY 0x0001
#define R3964_FRAME  0x0002
#define R3964_OVERRUN 0x0004
#define R3964_UNKNOWN 0x0008
#define R3964_BREAK   0x0010
#define R3964_CHECKSUM 0x0020
#define R3964_ERROR  0x003f
#define R3964_BCC   0x4000
#define R3964_DEBUG 0x8000


struct r3964_info {
        spinlock_t     lock;
        struct tty_struct *tty;
        unsigned char priority;
        unsigned char *rx_buf;            /* ring buffer */
        unsigned char *tx_buf;

        wait_queue_head_t read_wait;
        //struct wait_queue *read_wait;

        struct r3964_block_header *rx_first;
        struct r3964_block_header *rx_last;
        struct r3964_block_header *tx_first;
        struct r3964_block_header *tx_last;
        unsigned int tx_position;
        unsigned int rx_position;
        unsigned char last_rx;
        unsigned char bcc;
        unsigned int  blocks_in_rx_queue;
         
       
        struct r3964_client_info *firstClient;
        unsigned int state;
        unsigned int flags;

        struct timer_list tmr;
        int nRetry;
};

#endif 

#endif