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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