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1da177e4 LT |
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 $ | |
01e33b5a KH |
16 | * Revision 1.4 2005/12/21 19:54:24 Kurt Huwig <kurt huwig de> |
17 | * Fixed HZ usage on 2.6 kernels | |
18 | * Removed unnecessary include | |
19 | * | |
1da177e4 LT |
20 | * Revision 1.3 2001/03/18 13:02:24 dwmw2 |
21 | * Fix timer usage, use spinlocks properly. | |
22 | * | |
23 | * Revision 1.2 2001/03/18 12:53:15 dwmw2 | |
24 | * Merge changes in 2.4.2 | |
25 | * | |
26 | * Revision 1.1.1.1 1998/10/13 16:43:14 dwmw2 | |
27 | * This'll screw the version control | |
28 | * | |
29 | * Revision 1.6 1998/09/30 00:40:38 dwmw2 | |
30 | * Updated to use kernel's N_R3964 if available | |
31 | * | |
32 | * Revision 1.4 1998/04/02 20:29:44 lhaag | |
33 | * select, blocking, ... | |
34 | * | |
35 | * Revision 1.3 1998/02/12 18:58:43 root | |
36 | * fixed some memory leaks | |
37 | * calculation of checksum characters | |
38 | * | |
39 | * Revision 1.2 1998/02/07 13:03:17 root | |
40 | * ioctl read_telegram | |
41 | * | |
42 | * Revision 1.1 1998/02/06 19:19:43 root | |
43 | * Initial revision | |
44 | * | |
45 | * | |
46 | */ | |
47 | ||
48 | #ifndef __LINUX_N_R3964_H__ | |
49 | #define __LINUX_N_R3964_H__ | |
50 | ||
51 | /* line disciplines for r3964 protocol */ | |
1da177e4 LT |
52 | |
53 | #ifdef __KERNEL__ | |
01e33b5a KH |
54 | |
55 | #include <linux/param.h> | |
56 | ||
1da177e4 LT |
57 | /* |
58 | * Common ascii handshake characters: | |
59 | */ | |
60 | ||
61 | #define STX 0x02 | |
62 | #define ETX 0x03 | |
63 | #define DLE 0x10 | |
64 | #define NAK 0x15 | |
65 | ||
66 | /* | |
01e33b5a | 67 | * Timeouts (from milliseconds to jiffies) |
1da177e4 LT |
68 | */ |
69 | ||
01e33b5a KH |
70 | #define R3964_TO_QVZ ((550)*HZ/1000) |
71 | #define R3964_TO_ZVZ ((220)*HZ/1000) | |
72 | #define R3964_TO_NO_BUF ((400)*HZ/1000) | |
73 | #define R3964_NO_TX_ROOM ((100)*HZ/1000) | |
74 | #define R3964_TO_RX_PANIC ((4000)*HZ/1000) | |
1da177e4 LT |
75 | #define R3964_MAX_RETRIES 5 |
76 | ||
77 | #endif | |
78 | ||
79 | /* | |
80 | * Ioctl-commands | |
81 | */ | |
82 | ||
83 | #define R3964_ENABLE_SIGNALS 0x5301 | |
84 | #define R3964_SETPRIORITY 0x5302 | |
85 | #define R3964_USE_BCC 0x5303 | |
86 | #define R3964_READ_TELEGRAM 0x5304 | |
87 | ||
88 | /* Options for R3964_SETPRIORITY */ | |
89 | #define R3964_MASTER 0 | |
90 | #define R3964_SLAVE 1 | |
91 | ||
92 | /* Options for R3964_ENABLE_SIGNALS */ | |
93 | #define R3964_SIG_ACK 0x0001 | |
94 | #define R3964_SIG_DATA 0x0002 | |
95 | #define R3964_SIG_ALL 0x000f | |
96 | #define R3964_SIG_NONE 0x0000 | |
97 | #define R3964_USE_SIGIO 0x1000 | |
98 | ||
99 | /* | |
100 | * r3964 operation states: | |
101 | */ | |
102 | #ifdef __KERNEL__ | |
103 | ||
104 | enum { R3964_IDLE, | |
105 | R3964_TX_REQUEST, R3964_TRANSMITTING, | |
106 | R3964_WAIT_ZVZ_BEFORE_TX_RETRY, R3964_WAIT_FOR_TX_ACK, | |
107 | R3964_WAIT_FOR_RX_BUF, | |
108 | R3964_RECEIVING, R3964_WAIT_FOR_BCC, R3964_WAIT_FOR_RX_REPEAT | |
109 | }; | |
110 | ||
111 | /* | |
112 | * All open file-handles are 'clients' and are stored in a linked list: | |
113 | */ | |
114 | ||
115 | struct r3964_message; | |
116 | ||
117 | struct r3964_client_info { | |
118 | spinlock_t lock; | |
3cec556a | 119 | struct pid *pid; |
1da177e4 LT |
120 | unsigned int sig_flags; |
121 | ||
122 | struct r3964_client_info *next; | |
123 | ||
124 | struct r3964_message *first_msg; | |
125 | struct r3964_message *last_msg; | |
126 | struct r3964_block_header *next_block_to_read; | |
127 | int msg_count; | |
128 | }; | |
129 | ||
130 | ||
131 | #endif | |
132 | ||
133 | /* types for msg_id: */ | |
134 | enum {R3964_MSG_ACK=1, R3964_MSG_DATA }; | |
135 | ||
136 | #define R3964_MAX_MSG_COUNT 32 | |
137 | ||
138 | /* error codes for client messages */ | |
139 | #define R3964_OK 0 /* no error. */ | |
140 | #define R3964_TX_FAIL -1 /* transmission error, block NOT sent */ | |
141 | #define R3964_OVERFLOW -2 /* msg queue overflow */ | |
142 | ||
143 | /* the client gets this struct when calling read(fd,...): */ | |
144 | struct r3964_client_message { | |
145 | int msg_id; | |
146 | int arg; | |
147 | int error_code; | |
148 | }; | |
149 | ||
150 | #define R3964_MTU 256 | |
151 | ||
152 | ||
153 | #ifdef __KERNEL__ | |
154 | ||
155 | struct r3964_block_header; | |
156 | ||
157 | /* internal version of client_message: */ | |
158 | struct r3964_message { | |
159 | int msg_id; | |
160 | int arg; | |
161 | int error_code; | |
162 | struct r3964_block_header *block; | |
163 | struct r3964_message *next; | |
164 | }; | |
165 | ||
166 | /* | |
167 | * Header of received block in rx_buf/tx_buf: | |
168 | */ | |
169 | ||
170 | struct r3964_block_header | |
171 | { | |
172 | unsigned int length; /* length in chars without header */ | |
173 | unsigned char *data; /* usually data is located | |
174 | immediately behind this struct */ | |
175 | unsigned int locks; /* only used in rx_buffer */ | |
176 | ||
177 | struct r3964_block_header *next; | |
178 | struct r3964_client_info *owner; /* =NULL in rx_buffer */ | |
179 | }; | |
180 | ||
181 | /* | |
182 | * If rx_buf hasn't enough space to store R3964_MTU chars, | |
183 | * we will reject all incoming STX-requests by sending NAK. | |
184 | */ | |
185 | ||
186 | #define RX_BUF_SIZE 4000 | |
187 | #define TX_BUF_SIZE 4000 | |
188 | #define R3964_MAX_BLOCKS_IN_RX_QUEUE 100 | |
189 | ||
190 | #define R3964_PARITY 0x0001 | |
191 | #define R3964_FRAME 0x0002 | |
192 | #define R3964_OVERRUN 0x0004 | |
193 | #define R3964_UNKNOWN 0x0008 | |
194 | #define R3964_BREAK 0x0010 | |
195 | #define R3964_CHECKSUM 0x0020 | |
196 | #define R3964_ERROR 0x003f | |
197 | #define R3964_BCC 0x4000 | |
198 | #define R3964_DEBUG 0x8000 | |
199 | ||
200 | ||
201 | struct r3964_info { | |
202 | spinlock_t lock; | |
203 | struct tty_struct *tty; | |
204 | unsigned char priority; | |
205 | unsigned char *rx_buf; /* ring buffer */ | |
206 | unsigned char *tx_buf; | |
207 | ||
208 | wait_queue_head_t read_wait; | |
209 | //struct wait_queue *read_wait; | |
210 | ||
211 | struct r3964_block_header *rx_first; | |
212 | struct r3964_block_header *rx_last; | |
213 | struct r3964_block_header *tx_first; | |
214 | struct r3964_block_header *tx_last; | |
215 | unsigned int tx_position; | |
216 | unsigned int rx_position; | |
217 | unsigned char last_rx; | |
218 | unsigned char bcc; | |
219 | unsigned int blocks_in_rx_queue; | |
220 | ||
221 | ||
222 | struct r3964_client_info *firstClient; | |
223 | unsigned int state; | |
224 | unsigned int flags; | |
225 | ||
226 | struct timer_list tmr; | |
227 | int nRetry; | |
228 | }; | |
229 | ||
230 | #endif | |
231 | ||
232 | #endif |