include/linux/n_r3964.h

   1 /* r3964 linediscipline for linux
   2  *
   3  * -----------------------------------------------------------
   4  * Copyright by
   5  * Philips Automation Projects
   6  * Kassel (Germany)
   7  * http://www.pap-philips.de
   8  * -----------------------------------------------------------
   9  * This software may be used and distributed according to the terms of
  10  * the GNU General Public License, incorporated herein by reference.
  11  *
  12  * Author:
  13  * L. Haag
  14  *
  15  * $Log: r3964.h,v $
  16  * Revision 1.3  2001/03/18 13:02:24  dwmw2
  17  * Fix timer usage, use spinlocks properly.
  18  *
  19  * Revision 1.2  2001/03/18 12:53:15  dwmw2
  20  * Merge changes in 2.4.2
  21  *
  22  * Revision 1.1.1.1  1998/10/13 16:43:14  dwmw2
  23  * This'll screw the version control
  24  *
  25  * Revision 1.6  1998/09/30 00:40:38  dwmw2
  26  * Updated to use kernel's N_R3964 if available
  27  *
  28  * Revision 1.4  1998/04/02 20:29:44  lhaag
  29  * select, blocking, ...
  30  *
  31  * Revision 1.3  1998/02/12 18:58:43  root
  32  * fixed some memory leaks
  33  * calculation of checksum characters
  34  *
  35  * Revision 1.2  1998/02/07 13:03:17  root
  36  * ioctl read_telegram
  37  *
  38  * Revision 1.1  1998/02/06 19:19:43  root
  39  * Initial revision
  40  *
  41  *
  42  */
  43
  44 #ifndef __LINUX_N_R3964_H__
  45 #define __LINUX_N_R3964_H__
  46
  47 /* line disciplines for r3964 protocol */
  48 #include <asm/termios.h>
  49
  50 #ifdef __KERNEL__
  51 /*
  52  * Common ascii handshake characters:
  53  */
  54
  55 #define STX 0x02
  56 #define ETX 0x03
  57 #define DLE 0x10
  58 #define NAK 0x15
  59
  60 /*
  61  * Timeouts (msecs/10 msecs per timer interrupt):
  62  */
  63
  64 #define R3964_TO_QVZ 550/10
  65 #define R3964_TO_ZVZ 220/10
  66 #define R3964_TO_NO_BUF 400/10
  67 #define R3964_NO_TX_ROOM 100/10
  68 #define R3964_TO_RX_PANIC 4000/10
  69 #define R3964_MAX_RETRIES 5
  70
  71 #endif
  72
  73 /*
  74  * Ioctl-commands
  75  */
  76
  77 #define R3964_ENABLE_SIGNALS      0x5301
  78 #define R3964_SETPRIORITY         0x5302
  79 #define R3964_USE_BCC             0x5303
  80 #define R3964_READ_TELEGRAM       0x5304
  81
  82 /* Options for R3964_SETPRIORITY */
  83 #define R3964_MASTER   0
  84 #define R3964_SLAVE    1
  85
  86 /* Options for R3964_ENABLE_SIGNALS */
  87 #define R3964_SIG_ACK   0x0001
  88 #define R3964_SIG_DATA  0x0002
  89 #define R3964_SIG_ALL   0x000f
  90 #define R3964_SIG_NONE  0x0000
  91 #define R3964_USE_SIGIO 0x1000
  92
  93 /*
  94  * r3964 operation states:
  95  */
  96 #ifdef __KERNEL__
  97
  98 enum { R3964_IDLE,
  99            R3964_TX_REQUEST, R3964_TRANSMITTING,
 100            R3964_WAIT_ZVZ_BEFORE_TX_RETRY, R3964_WAIT_FOR_TX_ACK,
 101            R3964_WAIT_FOR_RX_BUF,
 102            R3964_RECEIVING, R3964_WAIT_FOR_BCC, R3964_WAIT_FOR_RX_REPEAT
 103            };
 104
 105 /*
 106  * All open file-handles are 'clients' and are stored in a linked list:
 107  */
 108
 109 struct r3964_message;
 110
 111 struct r3964_client_info {
 112         spinlock_t     lock;
 113         pid_t          pid;
 114         unsigned int   sig_flags;
 115
 116         struct r3964_client_info *next;
 117
 118         struct r3964_message *first_msg;
 119         struct r3964_message *last_msg;
 120         struct r3964_block_header *next_block_to_read;
 121         int            msg_count;
 122 };
 123
 124
 125 #endif
 126
 127 /* types for msg_id: */
 128 enum {R3964_MSG_ACK=1, R3964_MSG_DATA };
 129
 130 #define R3964_MAX_MSG_COUNT 32
 131
 132 /* error codes for client messages */
 133 #define R3964_OK 0        /* no error. */
 134 #define R3964_TX_FAIL -1  /* transmission error, block NOT sent */
 135 #define R3964_OVERFLOW -2 /* msg queue overflow */
 136
 137 /* the client gets this struct when calling read(fd,...): */
 138 struct r3964_client_message {
 139           int     msg_id;
 140           int     arg;
 141           int     error_code;
 142 };
 143
 144 #define R3964_MTU      256
 145
 146
 147 #ifdef __KERNEL__
 148
 149 struct r3964_block_header;
 150
 151 /* internal version of client_message: */
 152 struct r3964_message {
 153           int     msg_id;
 154           int     arg;
 155           int     error_code;
 156           struct r3964_block_header *block;
 157           struct r3964_message *next;
 158 };
 159
 160 /*
 161  * Header of received block in rx_buf/tx_buf:
 162  */
 163
 164 struct r3964_block_header
 165 {
 166         unsigned int length;             /* length in chars without header */
 167         unsigned char *data;             /* usually data is located
 168                                         immediately behind this struct */
 169         unsigned int locks;              /* only used in rx_buffer */
 170
 171     struct r3964_block_header *next;
 172         struct r3964_client_info *owner;  /* =NULL in rx_buffer */
 173 };
 174
 175 /*
 176  * If rx_buf hasn't enough space to store R3964_MTU chars,
 177  * we will reject all incoming STX-requests by sending NAK.
 178  */
 179
 180 #define RX_BUF_SIZE    4000
 181 #define TX_BUF_SIZE    4000
 182 #define R3964_MAX_BLOCKS_IN_RX_QUEUE 100
 183
 184 #define R3964_PARITY 0x0001
 185 #define R3964_FRAME  0x0002
 186 #define R3964_OVERRUN 0x0004
 187 #define R3964_UNKNOWN 0x0008
 188 #define R3964_BREAK   0x0010
 189 #define R3964_CHECKSUM 0x0020
 190 #define R3964_ERROR  0x003f
 191 #define R3964_BCC   0x4000
 192 #define R3964_DEBUG 0x8000
 193
 194
 195 struct r3964_info {
 196         spinlock_t     lock;
 197         struct tty_struct *tty;
 198         unsigned char priority;
 199         unsigned char *rx_buf;            /* ring buffer */
 200         unsigned char *tx_buf;
 201
 202         wait_queue_head_t read_wait;
 203         //struct wait_queue *read_wait;
 204
 205         struct r3964_block_header *rx_first;
 206         struct r3964_block_header *rx_last;
 207         struct r3964_block_header *tx_first;
 208         struct r3964_block_header *tx_last;
 209         unsigned int tx_position;
 210         unsigned int rx_position;
 211         unsigned char last_rx;
 212         unsigned char bcc;
 213         unsigned int  blocks_in_rx_queue;
 214
 215
 216         struct r3964_client_info *firstClient;
 217         unsigned int state;
 218         unsigned int flags;
 219
 220         struct timer_list tmr;
 221         int nRetry;
 222 };
 223
 224 #endif
 225
 226 #endif