1 /* r3964 linediscipline for linux
3 * -----------------------------------------------------------
5 * Philips Automation Projects
7 * -----------------------------------------------------------
8 * This software may be used and distributed according to the terms of
9 * the GNU General Public License, incorporated herein by reference.
15 * Revision 1.4 2005/12/21 19:54:24 Kurt Huwig <kurt huwig de>
16 * Fixed HZ usage on 2.6 kernels
17 * Removed unnecessary include
19 * Revision 1.3 2001/03/18 13:02:24 dwmw2
20 * Fix timer usage, use spinlocks properly.
22 * Revision 1.2 2001/03/18 12:53:15 dwmw2
23 * Merge changes in 2.4.2
25 * Revision 1.1.1.1 1998/10/13 16:43:14 dwmw2
26 * This'll screw the version control
28 * Revision 1.6 1998/09/30 00:40:38 dwmw2
29 * Updated to use kernel's N_R3964 if available
31 * Revision 1.4 1998/04/02 20:29:44 lhaag
32 * select, blocking, ...
34 * Revision 1.3 1998/02/12 18:58:43 root
35 * fixed some memory leaks
36 * calculation of checksum characters
38 * Revision 1.2 1998/02/07 13:03:17 root
41 * Revision 1.1 1998/02/06 19:19:43 root
46 #ifndef __LINUX_N_R3964_H__
47 #define __LINUX_N_R3964_H__
50 #include <linux/param.h>
51 #include <uapi/linux/n_r3964.h>
54 * Common ascii handshake characters:
63 * Timeouts (from milliseconds to jiffies)
66 #define R3964_TO_QVZ ((550)*HZ/1000)
67 #define R3964_TO_ZVZ ((220)*HZ/1000)
68 #define R3964_TO_NO_BUF ((400)*HZ/1000)
69 #define R3964_NO_TX_ROOM ((100)*HZ/1000)
70 #define R3964_TO_RX_PANIC ((4000)*HZ/1000)
71 #define R3964_MAX_RETRIES 5
75 R3964_TX_REQUEST, R3964_TRANSMITTING,
76 R3964_WAIT_ZVZ_BEFORE_TX_RETRY, R3964_WAIT_FOR_TX_ACK,
77 R3964_WAIT_FOR_RX_BUF,
78 R3964_RECEIVING, R3964_WAIT_FOR_BCC, R3964_WAIT_FOR_RX_REPEAT
82 * All open file-handles are 'clients' and are stored in a linked list:
87 struct r3964_client_info {
90 unsigned int sig_flags;
92 struct r3964_client_info *next;
94 struct r3964_message *first_msg;
95 struct r3964_message *last_msg;
96 struct r3964_block_header *next_block_to_read;
102 struct r3964_block_header;
104 /* internal version of client_message: */
105 struct r3964_message {
109 struct r3964_block_header *block;
110 struct r3964_message *next;
114 * Header of received block in rx_buf/tx_buf:
117 struct r3964_block_header
119 unsigned int length; /* length in chars without header */
120 unsigned char *data; /* usually data is located
121 immediately behind this struct */
122 unsigned int locks; /* only used in rx_buffer */
124 struct r3964_block_header *next;
125 struct r3964_client_info *owner; /* =NULL in rx_buffer */
129 * If rx_buf hasn't enough space to store R3964_MTU chars,
130 * we will reject all incoming STX-requests by sending NAK.
133 #define RX_BUF_SIZE 4000
134 #define TX_BUF_SIZE 4000
135 #define R3964_MAX_BLOCKS_IN_RX_QUEUE 100
137 #define R3964_PARITY 0x0001
138 #define R3964_FRAME 0x0002
139 #define R3964_OVERRUN 0x0004
140 #define R3964_UNKNOWN 0x0008
141 #define R3964_BREAK 0x0010
142 #define R3964_CHECKSUM 0x0020
143 #define R3964_ERROR 0x003f
144 #define R3964_BCC 0x4000
145 #define R3964_DEBUG 0x8000
150 struct tty_struct *tty;
151 unsigned char priority;
152 unsigned char *rx_buf; /* ring buffer */
153 unsigned char *tx_buf;
155 wait_queue_head_t read_wait;
156 //struct wait_queue *read_wait;
158 struct r3964_block_header *rx_first;
159 struct r3964_block_header *rx_last;
160 struct r3964_block_header *tx_first;
161 struct r3964_block_header *tx_last;
162 unsigned int tx_position;
163 unsigned int rx_position;
164 unsigned char last_rx;
166 unsigned int blocks_in_rx_queue;
169 struct r3964_client_info *firstClient;
173 struct timer_list tmr;