diff options
Diffstat (limited to 'kernel/drivers/isdn/pcbit/edss1.c')
| -rw-r--r-- | kernel/drivers/isdn/pcbit/edss1.c | 313 |
1 files changed, 313 insertions, 0 deletions
diff --git a/kernel/drivers/isdn/pcbit/edss1.c b/kernel/drivers/isdn/pcbit/edss1.c new file mode 100644 index 000000000..b2262ba6f --- /dev/null +++ b/kernel/drivers/isdn/pcbit/edss1.c @@ -0,0 +1,313 @@ +/* + * 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); + +} |