--- /dev/null
+/*
+ * DSS.1 Finite State Machine
+ * base: ITU-T Rec Q.931
+ *
+ * Copyright (C) 1996 Universidade de Lisboa
+ *
+ * Written by Pedro Roque Marques (roque@di.fc.ul.pt)
+ *
+ * This software may be used and distributed according to the terms of
+ * the GNU General Public License, incorporated herein by reference.
+ */
+
+/*
+ * TODO: complete the FSM
+ * move state/event descriptions to a user space logger
+ */
+
+#include <linux/string.h>
+#include <linux/kernel.h>
+
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/skbuff.h>
+
+#include <linux/timer.h>
+#include <asm/io.h>
+
+#include <linux/isdnif.h>
+
+#include "pcbit.h"
+#include "edss1.h"
+#include "layer2.h"
+#include "callbacks.h"
+
+
+const char * const isdn_state_table[] = {
+ "Closed",
+ "Call initiated",
+ "Overlap sending",
+ "Outgoing call proceeding",
+ "NOT DEFINED",
+ "Call delivered",
+ "Call present",
+ "Call received",
+ "Connect request",
+ "Incoming call proceeding",
+ "Active",
+ "Disconnect request",
+ "Disconnect indication",
+ "NOT DEFINED",
+ "NOT DEFINED",
+ "Suspend request",
+ "NOT DEFINED",
+ "Resume request",
+ "NOT DEFINED",
+ "Release Request",
+ "NOT DEFINED",
+ "NOT DEFINED",
+ "NOT DEFINED",
+ "NOT DEFINED",
+ "NOT DEFINED",
+ "Overlap receiving",
+ "Select protocol on B-Channel",
+ "Activate B-channel protocol"
+};
+
+#ifdef DEBUG_ERRS
+static
+struct CauseValue {
+ byte nr;
+ char *descr;
+} cvlist[] = {
+ {0x01, "Unallocated (unassigned) number"},
+ {0x02, "No route to specified transit network"},
+ {0x03, "No route to destination"},
+ {0x04, "Send special information tone"},
+ {0x05, "Misdialled trunk prefix"},
+ {0x06, "Channel unacceptable"},
+ {0x07, "Channel awarded and being delivered in an established channel"},
+ {0x08, "Preemption"},
+ {0x09, "Preemption - circuit reserved for reuse"},
+ {0x10, "Normal call clearing"},
+ {0x11, "User busy"},
+ {0x12, "No user responding"},
+ {0x13, "No answer from user (user alerted)"},
+ {0x14, "Subscriber absent"},
+ {0x15, "Call rejected"},
+ {0x16, "Number changed"},
+ {0x1a, "non-selected user clearing"},
+ {0x1b, "Destination out of order"},
+ {0x1c, "Invalid number format (address incomplete)"},
+ {0x1d, "Facility rejected"},
+ {0x1e, "Response to Status enquiry"},
+ {0x1f, "Normal, unspecified"},
+ {0x22, "No circuit/channel available"},
+ {0x26, "Network out of order"},
+ {0x27, "Permanent frame mode connection out-of-service"},
+ {0x28, "Permanent frame mode connection operational"},
+ {0x29, "Temporary failure"},
+ {0x2a, "Switching equipment congestion"},
+ {0x2b, "Access information discarded"},
+ {0x2c, "Requested circuit/channel not available"},
+ {0x2e, "Precedence call blocked"},
+ {0x2f, "Resource unavailable, unspecified"},
+ {0x31, "Quality of service unavailable"},
+ {0x32, "Requested facility not subscribed"},
+ {0x35, "Outgoing calls barred within CUG"},
+ {0x37, "Incoming calls barred within CUG"},
+ {0x39, "Bearer capability not authorized"},
+ {0x3a, "Bearer capability not presently available"},
+ {0x3e, "Inconsistency in designated outgoing access information and subscriber class"},
+ {0x3f, "Service or option not available, unspecified"},
+ {0x41, "Bearer capability not implemented"},
+ {0x42, "Channel type not implemented"},
+ {0x43, "Requested facility not implemented"},
+ {0x44, "Only restricted digital information bearer capability is available"},
+ {0x4f, "Service or option not implemented"},
+ {0x51, "Invalid call reference value"},
+ {0x52, "Identified channel does not exist"},
+ {0x53, "A suspended call exists, but this call identity does not"},
+ {0x54, "Call identity in use"},
+ {0x55, "No call suspended"},
+ {0x56, "Call having the requested call identity has been cleared"},
+ {0x57, "User not member of CUG"},
+ {0x58, "Incompatible destination"},
+ {0x5a, "Non-existent CUG"},
+ {0x5b, "Invalid transit network selection"},
+ {0x5f, "Invalid message, unspecified"},
+ {0x60, "Mandatory information element is missing"},
+ {0x61, "Message type non-existent or not implemented"},
+ {0x62, "Message not compatible with call state or message type non-existent or not implemented"},
+ {0x63, "Information element/parameter non-existent or not implemented"},
+ {0x64, "Invalid information element contents"},
+ {0x65, "Message not compatible with call state"},
+ {0x66, "Recovery on timer expiry"},
+ {0x67, "Parameter non-existent or not implemented - passed on"},
+ {0x6e, "Message with unrecognized parameter discarded"},
+ {0x6f, "Protocol error, unspecified"},
+ {0x7f, "Interworking, unspecified"}
+};
+
+#endif
+
+static struct isdn_event_desc {
+ unsigned short ev;
+ char *desc;
+} isdn_event_table[] = {
+ {EV_USR_SETUP_REQ, "CC->L3: Setup Request"},
+ {EV_USR_SETUP_RESP, "CC->L3: Setup Response"},
+ {EV_USR_PROCED_REQ, "CC->L3: Proceeding Request"},
+ {EV_USR_RELEASE_REQ, "CC->L3: Release Request"},
+
+ {EV_NET_SETUP, "NET->TE: setup "},
+ {EV_NET_CALL_PROC, "NET->TE: call proceeding"},
+ {EV_NET_SETUP_ACK, "NET->TE: setup acknowledge (more info needed)"},
+ {EV_NET_CONN, "NET->TE: connect"},
+ {EV_NET_CONN_ACK, "NET->TE: connect acknowledge"},
+ {EV_NET_DISC, "NET->TE: disconnect indication"},
+ {EV_NET_RELEASE, "NET->TE: release"},
+ {EV_NET_RELEASE_COMP, "NET->TE: release complete"},
+ {EV_NET_SELP_RESP, "Board: Select B-channel protocol ack"},
+ {EV_NET_ACTV_RESP, "Board: Activate B-channel protocol ack"},
+ {EV_TIMER, "Timeout"},
+ {0, "NULL"}
+};
+
+char *strisdnevent(ushort ev)
+{
+ struct isdn_event_desc *entry;
+
+ for (entry = isdn_event_table; entry->ev; entry++)
+ if (entry->ev == ev)
+ break;
+
+ return entry->desc;
+}
+
+/*
+ * Euro ISDN finite state machine
+ */
+
+static struct fsm_timer_entry fsm_timers[] = {
+ {ST_CALL_PROC, 10},
+ {ST_DISC_REQ, 2},
+ {ST_ACTIVE_SELP, 5},
+ {ST_ACTIVE_ACTV, 5},
+ {ST_INCM_PROC, 10},
+ {ST_CONN_REQ, 2},
+ {0xff, 0}
+};
+
+static struct fsm_entry fsm_table[] = {
+/* Connect Phase */
+ /* Outgoing */
+ {ST_NULL, ST_CALL_INIT, EV_USR_SETUP_REQ, cb_out_1},
+
+ {ST_CALL_INIT, ST_OVER_SEND, EV_NET_SETUP_ACK, cb_notdone},
+ {ST_CALL_INIT, ST_CALL_PROC, EV_NET_CALL_PROC, NULL},
+ {ST_CALL_INIT, ST_NULL, EV_NET_DISC, cb_out_2},
+
+ {ST_CALL_PROC, ST_ACTIVE_SELP, EV_NET_CONN, cb_out_2},
+ {ST_CALL_PROC, ST_NULL, EV_NET_DISC, cb_disc_1},
+ {ST_CALL_PROC, ST_DISC_REQ, EV_USR_RELEASE_REQ, cb_disc_2},
+
+ /* Incoming */
+ {ST_NULL, ST_CALL_PRES, EV_NET_SETUP, NULL},
+
+ {ST_CALL_PRES, ST_INCM_PROC, EV_USR_PROCED_REQ, cb_in_1},
+ {ST_CALL_PRES, ST_DISC_REQ, EV_USR_RELEASE_REQ, cb_disc_2},
+
+ {ST_INCM_PROC, ST_CONN_REQ, EV_USR_SETUP_RESP, cb_in_2},
+ {ST_INCM_PROC, ST_DISC_REQ, EV_USR_RELEASE_REQ, cb_disc_2},
+
+ {ST_CONN_REQ, ST_ACTIVE_SELP, EV_NET_CONN_ACK, cb_in_3},
+
+ /* Active */
+ {ST_ACTIVE, ST_NULL, EV_NET_DISC, cb_disc_1},
+ {ST_ACTIVE, ST_DISC_REQ, EV_USR_RELEASE_REQ, cb_disc_2},
+ {ST_ACTIVE, ST_NULL, EV_NET_RELEASE, cb_disc_3},
+
+ /* Disconnect */
+
+ {ST_DISC_REQ, ST_NULL, EV_NET_DISC, cb_disc_1},
+ {ST_DISC_REQ, ST_NULL, EV_NET_RELEASE, cb_disc_3},
+
+ /* protocol selection */
+ {ST_ACTIVE_SELP, ST_ACTIVE_ACTV, EV_NET_SELP_RESP, cb_selp_1},
+ {ST_ACTIVE_SELP, ST_DISC_REQ, EV_USR_RELEASE_REQ, cb_disc_2},
+
+ {ST_ACTIVE_ACTV, ST_ACTIVE, EV_NET_ACTV_RESP, cb_open},
+ {ST_ACTIVE_ACTV, ST_DISC_REQ, EV_USR_RELEASE_REQ, cb_disc_2},
+
+ /* Timers */
+ {ST_CALL_PROC, ST_DISC_REQ, EV_TIMER, cb_disc_2},
+ {ST_DISC_REQ, ST_NULL, EV_TIMER, cb_disc_3},
+ {ST_ACTIVE_SELP, ST_DISC_REQ, EV_TIMER, cb_disc_2},
+ {ST_ACTIVE_ACTV, ST_DISC_REQ, EV_TIMER, cb_disc_2},
+ {ST_INCM_PROC, ST_DISC_REQ, EV_TIMER, cb_disc_2},
+ {ST_CONN_REQ, ST_CONN_REQ, EV_TIMER, cb_in_2},
+
+ {0xff, 0, 0, NULL}
+};
+
+
+static void pcbit_fsm_timer(unsigned long data)
+{
+ struct pcbit_dev *dev;
+ struct pcbit_chan *chan;
+
+ chan = (struct pcbit_chan *) data;
+
+ del_timer(&chan->fsm_timer);
+ chan->fsm_timer.function = NULL;
+
+ dev = chan2dev(chan);
+
+ if (dev == NULL) {
+ printk(KERN_WARNING "pcbit: timer for unknown device\n");
+ return;
+ }
+
+ pcbit_fsm_event(dev, chan, EV_TIMER, NULL);
+}
+
+
+void pcbit_fsm_event(struct pcbit_dev *dev, struct pcbit_chan *chan,
+ unsigned short event, struct callb_data *data)
+{
+ struct fsm_entry *action;
+ struct fsm_timer_entry *tentry;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->lock, flags);
+
+ for (action = fsm_table; action->init != 0xff; action++)
+ if (action->init == chan->fsm_state && action->event == event)
+ break;
+
+ if (action->init == 0xff) {
+
+ spin_unlock_irqrestore(&dev->lock, flags);
+ printk(KERN_DEBUG "fsm error: event %x on state %x\n",
+ event, chan->fsm_state);
+ return;
+ }
+
+ if (chan->fsm_timer.function) {
+ del_timer(&chan->fsm_timer);
+ chan->fsm_timer.function = NULL;
+ }
+
+ chan->fsm_state = action->final;
+
+ pcbit_state_change(dev, chan, action->init, event, action->final);
+
+ for (tentry = fsm_timers; tentry->init != 0xff; tentry++)
+ if (tentry->init == chan->fsm_state)
+ break;
+
+ if (tentry->init != 0xff) {
+ init_timer(&chan->fsm_timer);
+ chan->fsm_timer.function = &pcbit_fsm_timer;
+ chan->fsm_timer.data = (ulong) chan;
+ chan->fsm_timer.expires = jiffies + tentry->timeout * HZ;
+ add_timer(&chan->fsm_timer);
+ }
+
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ if (action->callb)
+ action->callb(dev, chan, data);
+
+}
Code Review / kvmfornfv.git / blobdiff