1/* 2 * DSS.1 Finite State Machine 3 * base: ITU-T Rec Q.931 4 * 5 * Copyright (C) 1996 Universidade de Lisboa 6 * 7 * Written by Pedro Roque Marques (roque@di.fc.ul.pt) 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 13/* 14 * TODO: complete the FSM 15 * move state/event descriptions to a user space logger 16 */ 17 18#include <linux/string.h> 19#include <linux/kernel.h> 20 21#include <linux/types.h> 22#include <linux/mm.h> 23#include <linux/skbuff.h> 24 25#include <linux/timer.h> 26#include <asm/io.h> 27 28#include <linux/isdnif.h> 29 30#include "pcbit.h" 31#include "edss1.h" 32#include "layer2.h" 33#include "callbacks.h" 34 35 36char * isdn_state_table[] = { 37 "Closed", 38 "Call initiated", 39 "Overlap sending", 40 "Outgoing call proceeding", 41 "NOT DEFINED", 42 "Call delivered", 43 "Call present", 44 "Call received", 45 "Connect request", 46 "Incoming call proceeding", 47 "Active", 48 "Disconnect request", 49 "Disconnect indication", 50 "NOT DEFINED", 51 "NOT DEFINED", 52 "Suspend request", 53 "NOT DEFINED", 54 "Resume request", 55 "NOT DEFINED", 56 "Release Request", 57 "NOT DEFINED", 58 "NOT DEFINED", 59 "NOT DEFINED", 60 "NOT DEFINED", 61 "NOT DEFINED", 62 "Overlap receiving", 63 "Select protocol on B-Channel", 64 "Activate B-channel protocol" 65}; 66 67#ifdef DEBUG_ERRS 68static 69struct CauseValue { 70 byte nr; 71 char *descr; 72} cvlist[]={ 73 {0x01,"Unallocated (unassigned) number"}, 74 {0x02,"No route to specified transit network"}, 75 {0x03,"No route to destination"}, 76 {0x04,"Send special information tone"}, 77 {0x05,"Misdialled trunk prefix"}, 78 {0x06,"Channel unacceptable"}, 79 {0x07,"Channel awarded and being delivered in an established channel"}, 80 {0x08,"Preemption"}, 81 {0x09,"Preemption - circuit reserved for reuse"}, 82 {0x10,"Normal call clearing"}, 83 {0x11,"User busy"}, 84 {0x12,"No user responding"}, 85 {0x13,"No answer from user (user alerted)"}, 86 {0x14,"Subscriber absent"}, 87 {0x15,"Call rejected"}, 88 {0x16,"Number changed"}, 89 {0x1a,"non-selected user clearing"}, 90 {0x1b,"Destination out of order"}, 91 {0x1c,"Invalid number format (address incomplete)"}, 92 {0x1d,"Facility rejected"}, 93 {0x1e,"Response to Status enquiry"}, 94 {0x1f,"Normal, unspecified"}, 95 {0x22,"No circuit/channel available"}, 96 {0x26,"Network out of order"}, 97 {0x27,"Permanent frame mode connection out-of-service"}, 98 {0x28,"Permanent frame mode connection operational"}, 99 {0x29,"Temporary failure"}, 100 {0x2a,"Switching equipment congestion"}, 101 {0x2b,"Access information discarded"}, 102 {0x2c,"Requested circuit/channel not available"}, 103 {0x2e,"Precedence call blocked"}, 104 {0x2f,"Resource unavailable, unspecified"}, 105 {0x31,"Quality of service unavailable"}, 106 {0x32,"Requested facility not subscribed"}, 107 {0x35,"Outgoing calls barred within CUG"}, 108 {0x37,"Incoming calls barred within CUG"}, 109 {0x39,"Bearer capability not authorized"}, 110 {0x3a,"Bearer capability not presently available"}, 111 {0x3e,"Inconsistency in designated outgoing access information and subscriber class"}, 112 {0x3f,"Service or option not available, unspecified"}, 113 {0x41,"Bearer capability not implemented"}, 114 {0x42,"Channel type not implemented"}, 115 {0x43,"Requested facility not implemented"}, 116 {0x44,"Only restricted digital information bearer capability is available"}, 117 {0x4f,"Service or option not implemented"}, 118 {0x51,"Invalid call reference value"}, 119 {0x52,"Identified channel does not exist"}, 120 {0x53,"A suspended call exists, but this call identity does not"}, 121 {0x54,"Call identity in use"}, 122 {0x55,"No call suspended"}, 123 {0x56,"Call having the requested call identity has been cleared"}, 124 {0x57,"User not member of CUG"}, 125 {0x58,"Incompatible destination"}, 126 {0x5a,"Non-existent CUG"}, 127 {0x5b,"Invalid transit network selection"}, 128 {0x5f,"Invalid message, unspecified"}, 129 {0x60,"Mandatory information element is missing"}, 130 {0x61,"Message type non-existent or not implemented"}, 131 {0x62,"Message not compatible with call state or message type non-existent or not implemented"}, 132 {0x63,"Information element/parameter non-existent or not implemented"}, 133 {0x64,"Invalid information element contents"}, 134 {0x65,"Message not compatible with call state"}, 135 {0x66,"Recovery on timer expiry"}, 136 {0x67,"Parameter non-existent or not implemented - passed on"}, 137 {0x6e,"Message with unrecognized parameter discarded"}, 138 {0x6f,"Protocol error, unspecified"}, 139 {0x7f,"Interworking, unspecified"} 140}; 141 142#endif 143 144static struct isdn_event_desc { 145 unsigned short ev; 146 char * desc; 147} isdn_event_table [] = { 148 {EV_USR_SETUP_REQ, "CC->L3: Setup Request"}, 149 {EV_USR_SETUP_RESP, "CC->L3: Setup Response"}, 150 {EV_USR_PROCED_REQ, "CC->L3: Proceeding Request"}, 151 {EV_USR_RELEASE_REQ, "CC->L3: Release Request"}, 152 153 {EV_NET_SETUP, "NET->TE: setup "}, 154 {EV_NET_CALL_PROC, "NET->TE: call proceeding"}, 155 {EV_NET_SETUP_ACK, "NET->TE: setup acknowledge (more info needed)"}, 156 {EV_NET_CONN, "NET->TE: connect"}, 157 {EV_NET_CONN_ACK, "NET->TE: connect acknowledge"}, 158 {EV_NET_DISC, "NET->TE: disconnect indication"}, 159 {EV_NET_RELEASE, "NET->TE: release"}, 160 {EV_NET_RELEASE_COMP, "NET->TE: release complete"}, 161 {EV_NET_SELP_RESP, "Board: Select B-channel protocol ack"}, 162 {EV_NET_ACTV_RESP, "Board: Activate B-channel protocol ack"}, 163 {EV_TIMER, "Timeout"}, 164 {0, "NULL"} 165}; 166 167char * strisdnevent(ushort ev) 168{ 169 struct isdn_event_desc * entry; 170 171 for (entry = isdn_event_table; entry->ev; entry++) 172 if (entry->ev == ev) 173 break; 174 175 return entry->desc; 176} 177 178/* 179 * Euro ISDN finite state machine 180 */ 181 182static struct fsm_timer_entry fsm_timers[] = { 183 {ST_CALL_PROC, 10}, 184 {ST_DISC_REQ, 2}, 185 {ST_ACTIVE_SELP, 5}, 186 {ST_ACTIVE_ACTV, 5}, 187 {ST_INCM_PROC, 10}, 188 {ST_CONN_REQ, 2}, 189 {0xff, 0} 190}; 191 192static struct fsm_entry fsm_table[] = { 193/* Connect Phase */ 194 /* Outgoing */ 195 {ST_NULL, ST_CALL_INIT, EV_USR_SETUP_REQ, cb_out_1}, 196 197 {ST_CALL_INIT, ST_OVER_SEND, EV_NET_SETUP_ACK, cb_notdone}, 198 {ST_CALL_INIT, ST_CALL_PROC, EV_NET_CALL_PROC, NULL}, 199 {ST_CALL_INIT, ST_NULL, EV_NET_DISC, cb_out_2}, 200 201 {ST_CALL_PROC, ST_ACTIVE_SELP, EV_NET_CONN, cb_out_2}, 202 {ST_CALL_PROC, ST_NULL, EV_NET_DISC, cb_disc_1}, 203 {ST_CALL_PROC, ST_DISC_REQ, EV_USR_RELEASE_REQ, cb_disc_2}, 204 205 /* Incoming */ 206 {ST_NULL, ST_CALL_PRES, EV_NET_SETUP, NULL}, 207 208 {ST_CALL_PRES, ST_INCM_PROC, EV_USR_PROCED_REQ, cb_in_1}, 209 {ST_CALL_PRES, ST_DISC_REQ, EV_USR_RELEASE_REQ, cb_disc_2}, 210 211 {ST_INCM_PROC, ST_CONN_REQ, EV_USR_SETUP_RESP, cb_in_2}, 212 {ST_INCM_PROC, ST_DISC_REQ, EV_USR_RELEASE_REQ, cb_disc_2}, 213 214 {ST_CONN_REQ, ST_ACTIVE_SELP, EV_NET_CONN_ACK, cb_in_3}, 215 216 /* Active */ 217 {ST_ACTIVE, ST_NULL, EV_NET_DISC, cb_disc_1}, 218 {ST_ACTIVE, ST_DISC_REQ, EV_USR_RELEASE_REQ, cb_disc_2}, 219 {ST_ACTIVE, ST_NULL, EV_NET_RELEASE, cb_disc_3}, 220 221 /* Disconnect */ 222 223 {ST_DISC_REQ, ST_NULL, EV_NET_DISC, cb_disc_1}, 224 {ST_DISC_REQ, ST_NULL, EV_NET_RELEASE, cb_disc_3}, 225 226 /* protocol selection */ 227 {ST_ACTIVE_SELP, ST_ACTIVE_ACTV, EV_NET_SELP_RESP, cb_selp_1}, 228 {ST_ACTIVE_SELP, ST_DISC_REQ, EV_USR_RELEASE_REQ, cb_disc_2}, 229 230 {ST_ACTIVE_ACTV, ST_ACTIVE, EV_NET_ACTV_RESP, cb_open}, 231 {ST_ACTIVE_ACTV, ST_DISC_REQ, EV_USR_RELEASE_REQ, cb_disc_2}, 232 233 /* Timers */ 234 {ST_CALL_PROC, ST_DISC_REQ, EV_TIMER, cb_disc_2}, 235 {ST_DISC_REQ, ST_NULL, EV_TIMER, cb_disc_3}, 236 {ST_ACTIVE_SELP, ST_DISC_REQ, EV_TIMER, cb_disc_2}, 237 {ST_ACTIVE_ACTV, ST_DISC_REQ, EV_TIMER, cb_disc_2}, 238 {ST_INCM_PROC, ST_DISC_REQ, EV_TIMER, cb_disc_2}, 239 {ST_CONN_REQ, ST_CONN_REQ, EV_TIMER, cb_in_2}, 240 241 {0xff, 0, 0, NULL} 242}; 243 244 245static void pcbit_fsm_timer(unsigned long data) 246{ 247 struct pcbit_dev *dev; 248 struct pcbit_chan *chan; 249 250 chan = (struct pcbit_chan *) data; 251 252 del_timer(&chan->fsm_timer); 253 chan->fsm_timer.function = NULL; 254 255 dev = chan2dev(chan); 256 257 if (dev == NULL) { 258 printk(KERN_WARNING "pcbit: timer for unknown device\n"); 259 return; 260 } 261 262 pcbit_fsm_event(dev, chan, EV_TIMER, NULL); 263} 264 265 266void pcbit_fsm_event(struct pcbit_dev *dev, struct pcbit_chan *chan, 267 unsigned short event, struct callb_data *data) 268{ 269 struct fsm_entry * action; 270 struct fsm_timer_entry *tentry; 271 unsigned long flags; 272 273 spin_lock_irqsave(&dev->lock, flags); 274 275 for (action = fsm_table; action->init != 0xff; action++) 276 if (action->init == chan->fsm_state && action->event == event) 277 break; 278 279 if (action->init == 0xff) { 280 281 spin_unlock_irqrestore(&dev->lock, flags); 282 printk(KERN_DEBUG "fsm error: event %x on state %x\n", 283 event, chan->fsm_state); 284 return; 285 } 286 287 if (chan->fsm_timer.function) { 288 del_timer(&chan->fsm_timer); 289 chan->fsm_timer.function = NULL; 290 } 291 292 chan->fsm_state = action->final; 293 294 pcbit_state_change(dev, chan, action->init, event, action->final); 295 296 for (tentry = fsm_timers; tentry->init != 0xff; tentry++) 297 if (tentry->init == chan->fsm_state) 298 break; 299 300 if (tentry->init != 0xff) { 301 init_timer(&chan->fsm_timer); 302 chan->fsm_timer.function = &pcbit_fsm_timer; 303 chan->fsm_timer.data = (ulong) chan; 304 chan->fsm_timer.expires = jiffies + tentry->timeout * HZ; 305 add_timer(&chan->fsm_timer); 306 } 307 308 spin_unlock_irqrestore(&dev->lock, flags); 309 310 if (action->callb) 311 action->callb(dev, chan, data); 312 313} 314