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 Public License, incorporated herein by reference.
11 *
12 * Author:
13 * L. Haag
14 *
15 * $Log: r3964.h,v $
16 * Revision 1.1.1.1 1998/10/13 16:43:14 dwmw2
17 * This'll screw the version control
18 *
19 * Revision 1.6 1998/09/30 00:40:38 dwmw2
20 * Updated to use kernel's N_R3964 if available
21 *
22 * Revision 1.4 1998/04/02 20:29:44 lhaag
23 * select, blocking, ...
24 *
25 * Revision 1.3 1998/02/12 18:58:43 root
26 * fixed some memory leaks
27 * calculation of checksum characters
28 *
29 * Revision 1.2 1998/02/07 13:03:17 root
30 * ioctl read_telegram
31 *
32 * Revision 1.1 1998/02/06 19:19:43 root
33 * Initial revision
34 *
35 *
36 */
37
38 #ifndef __LINUX_N_R3964_H__
39 #define __LINUX_N_R3964_H__
40
41 /* line disciplines for r3964 protocol */
42 #include <asm/termios.h>
43
44 #ifdef __KERNEL__
45 /*
46 * Common ascii handshake characters:
47 */
48
49 #define STX 0x02
50 #define ETX 0x03
51 #define DLE 0x10
52 #define NAK 0x15
53
54 /*
55 * Timeouts (msecs/10 msecs per timer interrupt):
56 */
57
58 #define R3964_TO_QVZ 550/10
59 #define R3964_TO_ZVZ 220/10
60 #define R3964_TO_NO_BUF 400/10
61 #define R3964_NO_TX_ROOM 100/10
62 #define R3964_TO_RX_PANIC 4000/10
63 #define R3964_MAX_RETRIES 5
64
65 #endif
66
67 /*
68 * Ioctl-commands
69 */
70
71 #define R3964_ENABLE_SIGNALS 0x5301
72 #define R3964_SETPRIORITY 0x5302
73 #define R3964_USE_BCC 0x5303
74 #define R3964_READ_TELEGRAM 0x5304
75
76 /* Options for R3964_SETPRIORITY */
77 #define R3964_MASTER 0
78 #define R3964_SLAVE 1
79
80 /* Options for R3964_ENABLE_SIGNALS */
81 #define R3964_SIG_ACK 0x0001
82 #define R3964_SIG_DATA 0x0002
83 #define R3964_SIG_ALL 0x000f
84 #define R3964_SIG_NONE 0x0000
85 #define R3964_USE_SIGIO 0x1000
86
87 /*
88 * r3964 operation states:
89 */
90 #ifdef __KERNEL__
91
92 enum { R3964_IDLE,
93 R3964_TX_REQUEST, R3964_TRANSMITTING,
94 R3964_WAIT_ZVZ_BEFORE_TX_RETRY, R3964_WAIT_FOR_TX_ACK,
95 R3964_WAIT_FOR_RX_BUF,
96 R3964_RECEIVING, R3964_WAIT_FOR_BCC, R3964_WAIT_FOR_RX_REPEAT
97 };
98
99 /*
100 * All open file-handles are 'clients' and are stored in a linked list:
101 */
102
103 struct r3964_message;
104
105 struct r3964_client_info {
106 pid_t pid;
107 unsigned int sig_flags;
108
109 struct r3964_client_info *next;
110
111 struct r3964_message *first_msg;
112 struct r3964_message *last_msg;
113 struct r3964_block_header *next_block_to_read;
114 int msg_count;
115 };
116
117
118 #endif
119
120 /* types for msg_id: */
121 enum {R3964_MSG_ACK=1, R3964_MSG_DATA };
122
123 #define R3964_MAX_MSG_COUNT 32
124
125 /* error codes for client messages */
126 #define R3964_OK 0 /* no error. */
127 #define R3964_TX_FAIL -1 /* transmission error, block NOT sent */
128 #define R3964_OVERFLOW -2 /* msg queue overflow */
129
130 /* the client gets this struct when calling read(fd,...): */
131 struct r3964_client_message {
132 int msg_id;
133 int arg;
134 int error_code;
135 };
136
137 #define R3964_MTU 256
138
139
140 #ifdef __KERNEL__
141
142 struct r3964_block_header;
143
144 /* internal version of client_message: */
145 struct r3964_message {
146 int msg_id;
147 int arg;
148 int error_code;
149 struct r3964_block_header *block;
150 struct r3964_message *next;
151 };
152
153 /*
154 * Header of received block in rx_buf/tx_buf:
155 */
156
157 struct r3964_block_header
158 {
159 unsigned int length; /* length in chars without header */
160 unsigned char *data; /* usually data is located
161 immediatly behind this struct */
162 unsigned int locks; /* only used in rx_buffer */
163
164 struct r3964_block_header *next;
165 struct r3964_client_info *owner; /* =NULL in rx_buffer */
166 };
167
168 /*
169 * If rx_buf hasn't enough space to store R3964_MTU chars,
170 * we will reject all incoming STX-requests by sending NAK.
171 */
172
173 #define RX_BUF_SIZE 4000
174 #define TX_BUF_SIZE 4000
175 #define R3964_MAX_BLOCKS_IN_RX_QUEUE 100
176
177 #define R3964_PARITY 0x0001
178 #define R3964_FRAME 0x0002
179 #define R3964_OVERRUN 0x0004
180 #define R3964_UNKNOWN 0x0008
181 #define R3964_BREAK 0x0010
182 #define R3964_CHECKSUM 0x0020
183 #define R3964_ERROR 0x003f
184 #define R3964_BCC 0x4000
185 #define R3964_DEBUG 0x8000
186
187
188 struct r3964_info {
189 struct tty_struct *tty;
190 unsigned char priority;
191 unsigned char *rx_buf; /* ring buffer */
192 unsigned char *tx_buf;
193
194 wait_queue_head_t read_wait;
195 //struct wait_queue *read_wait;
196
197 struct r3964_block_header *rx_first;
198 struct r3964_block_header *rx_last;
199 struct r3964_block_header *tx_first;
200 struct r3964_block_header *tx_last;
201 unsigned int tx_position;
202 unsigned int rx_position;
203 unsigned char last_rx;
204 unsigned char bcc;
205 unsigned int blocks_in_rx_queue;
206
207
208 struct r3964_client_info *firstClient;
209 unsigned int state;
210 unsigned int flags;
211
212 int count_down;
213 int nRetry;
214
215 struct tq_struct bh_1;
216 struct tq_struct bh_2;
217 };
218
219 #endif
220
221 #endif
222
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