drivers/isdn/pcbit/edss1.c

   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
  36 const char * const 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
  68 static
  69 struct 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
 144 static 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
 167 char *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
 182 static 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
 192 static 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
 245 static 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
 266 void 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 }