[TG3]: Set minimal hw interrupt mitigation.

[linux-2.6/verdex.git] / net / irda / ircomm / ircomm_tty_attach.c

/*********************************************************************
 *                
 * Filename:      ircomm_tty_attach.c
 * Version:       
 * Description:   Code for attaching the serial driver to IrCOMM
 * Status:        Experimental.
 * Author:        Dag Brattli <dagb@cs.uit.no>
 * Created at:    Sat Jun  5 17:42:00 1999
 * Modified at:   Tue Jan  4 14:20:49 2000
 * Modified by:   Dag Brattli <dagb@cs.uit.no>
 * 
 *     Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
 *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
 *     
 *     This program is free software; you can redistribute it and/or 
 *     modify it under the terms of the GNU General Public License as 
 *     published by the Free Software Foundation; either version 2 of 
 *     the License, or (at your option) any later version.
 * 
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *     GNU General Public License for more details.
 * 
 *     You should have received a copy of the GNU General Public License 
 *     along with this program; if not, write to the Free Software 
 *     Foundation, Inc., 59 Temple Place, Suite 330, Boston, 
 *     MA 02111-1307 USA
 *     
 ********************************************************************/

#include <linux/sched.h>
#include <linux/init.h>

#include <net/irda/irda.h>
#include <net/irda/irlmp.h>
#include <net/irda/iriap.h>
#include <net/irda/irttp.h>
#include <net/irda/irias_object.h>
#include <net/irda/parameters.h>

#include <net/irda/ircomm_core.h>
#include <net/irda/ircomm_param.h>
#include <net/irda/ircomm_event.h>

#include <net/irda/ircomm_tty.h>
#include <net/irda/ircomm_tty_attach.h>

static void ircomm_tty_ias_register(struct ircomm_tty_cb *self);
static void ircomm_tty_discovery_indication(discinfo_t *discovery,
                                            DISCOVERY_MODE mode,
                                            void *priv);
static void ircomm_tty_getvalue_confirm(int result, __u16 obj_id, 
                                        struct ias_value *value, void *priv);
static void ircomm_tty_start_watchdog_timer(struct ircomm_tty_cb *self,
                                            int timeout);
static void ircomm_tty_watchdog_timer_expired(void *data);

static int ircomm_tty_state_idle(struct ircomm_tty_cb *self, 
                                 IRCOMM_TTY_EVENT event, 
                                 struct sk_buff *skb, 
                                 struct ircomm_tty_info *info);
static int ircomm_tty_state_search(struct ircomm_tty_cb *self, 
                                   IRCOMM_TTY_EVENT event, 
                                   struct sk_buff *skb, 
                                   struct ircomm_tty_info *info);
static int ircomm_tty_state_query_parameters(struct ircomm_tty_cb *self, 
                                             IRCOMM_TTY_EVENT event, 
                                             struct sk_buff *skb, 
                                             struct ircomm_tty_info *info);
static int ircomm_tty_state_query_lsap_sel(struct ircomm_tty_cb *self, 
                                           IRCOMM_TTY_EVENT event, 
                                           struct sk_buff *skb, 
                                           struct ircomm_tty_info *info);
static int ircomm_tty_state_setup(struct ircomm_tty_cb *self, 
                                  IRCOMM_TTY_EVENT event, 
                                  struct sk_buff *skb, 
                                  struct ircomm_tty_info *info);
static int ircomm_tty_state_ready(struct ircomm_tty_cb *self, 
                                  IRCOMM_TTY_EVENT event, 
                                  struct sk_buff *skb, 
                                  struct ircomm_tty_info *info);

char *ircomm_tty_state[] = {
        "IRCOMM_TTY_IDLE",
        "IRCOMM_TTY_SEARCH",
        "IRCOMM_TTY_QUERY_PARAMETERS",
        "IRCOMM_TTY_QUERY_LSAP_SEL",
        "IRCOMM_TTY_SETUP",
        "IRCOMM_TTY_READY",
        "*** ERROR *** ",
};

#ifdef CONFIG_IRDA_DEBUG
static char *ircomm_tty_event[] = {
        "IRCOMM_TTY_ATTACH_CABLE",
        "IRCOMM_TTY_DETACH_CABLE",
        "IRCOMM_TTY_DATA_REQUEST",
        "IRCOMM_TTY_DATA_INDICATION",
        "IRCOMM_TTY_DISCOVERY_REQUEST",
        "IRCOMM_TTY_DISCOVERY_INDICATION",
        "IRCOMM_TTY_CONNECT_CONFIRM",
        "IRCOMM_TTY_CONNECT_INDICATION",
        "IRCOMM_TTY_DISCONNECT_REQUEST",
        "IRCOMM_TTY_DISCONNECT_INDICATION",
        "IRCOMM_TTY_WD_TIMER_EXPIRED",
        "IRCOMM_TTY_GOT_PARAMETERS",
        "IRCOMM_TTY_GOT_LSAPSEL",
        "*** ERROR ****",
};
#endif /* CONFIG_IRDA_DEBUG */

static int (*state[])(struct ircomm_tty_cb *self, IRCOMM_TTY_EVENT event,
                      struct sk_buff *skb, struct ircomm_tty_info *info) = 
{
        ircomm_tty_state_idle,
        ircomm_tty_state_search,
        ircomm_tty_state_query_parameters,
        ircomm_tty_state_query_lsap_sel,
        ircomm_tty_state_setup,
        ircomm_tty_state_ready,
};

/*
 * Function ircomm_tty_attach_cable (driver)
 *
 *    Try to attach cable (IrCOMM link). This function will only return
 *    when the link has been connected, or if an error condition occurs. 
 *    If success, the return value is the resulting service type.
 */
int ircomm_tty_attach_cable(struct ircomm_tty_cb *self)
{
        IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );

        IRDA_ASSERT(self != NULL, return -1;);
        IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);

        /* Check if somebody has already connected to us */
        if (ircomm_is_connected(self->ircomm)) {
                IRDA_DEBUG(0, "%s(), already connected!\n", __FUNCTION__ );
                return 0;
        }

        /* Make sure nobody tries to write before the link is up */
        self->tty->hw_stopped = 1;

        ircomm_tty_ias_register(self);

        ircomm_tty_do_event(self, IRCOMM_TTY_ATTACH_CABLE, NULL, NULL);

        return 0;
}

/*
 * Function ircomm_detach_cable (driver)
 *
 *    Detach cable, or cable has been detached by peer
 *
 */
void ircomm_tty_detach_cable(struct ircomm_tty_cb *self)
{
        IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );

        IRDA_ASSERT(self != NULL, return;);
        IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);

        del_timer(&self->watchdog_timer);

        /* Remove discovery handler */
        if (self->ckey) {
                irlmp_unregister_client(self->ckey);
                self->ckey = NULL;
        }
        /* Remove IrCOMM hint bits */
        if (self->skey) {
                irlmp_unregister_service(self->skey);
                self->skey = NULL;
        }

        if (self->iriap) { 
                iriap_close(self->iriap);
                self->iriap = NULL;
        }

        /* Remove LM-IAS object */
        if (self->obj) {
                irias_delete_object(self->obj);
                self->obj = NULL;
        }

        ircomm_tty_do_event(self, IRCOMM_TTY_DETACH_CABLE, NULL, NULL);

        /* Reset some values */
        self->daddr = self->saddr = 0;
        self->dlsap_sel = self->slsap_sel = 0;

        memset(&self->settings, 0, sizeof(struct ircomm_params));
}

/*
 * Function ircomm_tty_ias_register (self)
 *
 *    Register with LM-IAS depending on which service type we are
 *
 */
static void ircomm_tty_ias_register(struct ircomm_tty_cb *self)
{
        __u8 oct_seq[6];
        __u16 hints;

        IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );

        IRDA_ASSERT(self != NULL, return;);
        IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
        
        /* Compute hint bits based on service */
        hints = irlmp_service_to_hint(S_COMM);
        if (self->service_type & IRCOMM_3_WIRE_RAW)
                hints |= irlmp_service_to_hint(S_PRINTER);

        /* Advertise IrCOMM hint bit in discovery */
        if (!self->skey)
                self->skey = irlmp_register_service(hints);
        /* Set up a discovery handler */
        if (!self->ckey)
                self->ckey = irlmp_register_client(hints,
                                                   ircomm_tty_discovery_indication,
                                                   NULL, (void *) self);

        /* If already done, no need to do it again */
        if (self->obj)
                return;

        if (self->service_type & IRCOMM_3_WIRE_RAW) {
                /* Register IrLPT with LM-IAS */
                self->obj = irias_new_object("IrLPT", IAS_IRLPT_ID);
                irias_add_integer_attrib(self->obj, "IrDA:IrLMP:LsapSel", 
                                         self->slsap_sel, IAS_KERNEL_ATTR);
        } else {
                /* Register IrCOMM with LM-IAS */
                self->obj = irias_new_object("IrDA:IrCOMM", IAS_IRCOMM_ID);
                irias_add_integer_attrib(self->obj, "IrDA:TinyTP:LsapSel", 
                                         self->slsap_sel, IAS_KERNEL_ATTR);
                
                /* Code the parameters into the buffer */
                irda_param_pack(oct_seq, "bbbbbb", 
                                IRCOMM_SERVICE_TYPE, 1, self->service_type,
                                IRCOMM_PORT_TYPE,    1, IRCOMM_SERIAL);
                
                /* Register parameters with LM-IAS */
                irias_add_octseq_attrib(self->obj, "Parameters", oct_seq, 6,
                                        IAS_KERNEL_ATTR);
        }
        irias_insert_object(self->obj);
}

/*
 * Function ircomm_tty_ias_unregister (self)
 *
 *    Remove our IAS object and client hook while connected.
 *
 */
static void ircomm_tty_ias_unregister(struct ircomm_tty_cb *self)
{
        /* Remove LM-IAS object now so it is not reused.
         * IrCOMM deals very poorly with multiple incoming connections.
         * It should looks a lot more like IrNET, and "dup" a server TSAP
         * to the application TSAP (based on various rules).
         * This is a cheap workaround allowing multiple clients to
         * connect to us. It will not always work.
         * Each IrCOMM socket has an IAS entry. Incoming connection will
         * pick the first one found. So, when we are fully connected,
         * we remove our IAS entries so that the next IAS entry is used.
         * We do that for *both* client and server, because a server
         * can also create client instances.
         * Jean II */
        if (self->obj) {
                irias_delete_object(self->obj);
                self->obj = NULL;
        }

#if 0
        /* Remove discovery handler.
         * While we are connected, we no longer need to receive
         * discovery events. This would be the case if there is
         * multiple IrLAP interfaces. Jean II */
        if (self->ckey) {
                irlmp_unregister_client(self->ckey);
                self->ckey = NULL;
        }
#endif
}

/*
 * Function ircomm_send_initial_parameters (self)
 *
 *    Send initial parameters to the remote IrCOMM device. These parameters
 *    must be sent before any data.
 */
int ircomm_tty_send_initial_parameters(struct ircomm_tty_cb *self)
{
        IRDA_ASSERT(self != NULL, return -1;);
        IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);

        if (self->service_type & IRCOMM_3_WIRE_RAW) 
                return 0;

        /* 
         * Set default values, but only if the application for some reason 
         * haven't set them already
         */
        IRDA_DEBUG(2, "%s(), data-rate = %d\n", __FUNCTION__ , 
                   self->settings.data_rate);
        if (!self->settings.data_rate)
                self->settings.data_rate = 9600;
        IRDA_DEBUG(2, "%s(), data-format = %d\n", __FUNCTION__ , 
                   self->settings.data_format);
        if (!self->settings.data_format)
                self->settings.data_format = IRCOMM_WSIZE_8;  /* 8N1 */

        IRDA_DEBUG(2, "%s(), flow-control = %d\n", __FUNCTION__ , 
                   self->settings.flow_control);
        /*self->settings.flow_control = IRCOMM_RTS_CTS_IN|IRCOMM_RTS_CTS_OUT;*/

        /* Do not set delta values for the initial parameters */
        self->settings.dte = IRCOMM_DTR | IRCOMM_RTS;

        /* Only send service type parameter when we are the client */
        if (self->client)
                ircomm_param_request(self, IRCOMM_SERVICE_TYPE, FALSE);
        ircomm_param_request(self, IRCOMM_DATA_RATE, FALSE);
        ircomm_param_request(self, IRCOMM_DATA_FORMAT, FALSE);
        
        /* For a 3 wire service, we just flush the last parameter and return */
        if (self->settings.service_type == IRCOMM_3_WIRE) {
                ircomm_param_request(self, IRCOMM_FLOW_CONTROL, TRUE);
                return 0;
        }

        /* Only 9-wire service types continue here */
        ircomm_param_request(self, IRCOMM_FLOW_CONTROL, FALSE);
#if 0
        ircomm_param_request(self, IRCOMM_XON_XOFF, FALSE);
        ircomm_param_request(self, IRCOMM_ENQ_ACK, FALSE);
#endif  
        /* Notify peer that we are ready to receive data */
        ircomm_param_request(self, IRCOMM_DTE, TRUE);
        
        return 0;
}

/*
 * Function ircomm_tty_discovery_indication (discovery)
 *
 *    Remote device is discovered, try query the remote IAS to see which
 *    device it is, and which services it has.
 *
 */
static void ircomm_tty_discovery_indication(discinfo_t *discovery,
                                            DISCOVERY_MODE mode,
                                            void *priv)
{
        struct ircomm_tty_cb *self;
        struct ircomm_tty_info info;

        IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

        /* Important note :
         * We need to drop all passive discoveries.
         * The LSAP management of IrComm is deficient and doesn't deal
         * with the case of two instance connecting to each other
         * simultaneously (it will deadlock in LMP).
         * The proper fix would be to use the same technique as in IrNET,
         * to have one server socket and separate instances for the
         * connecting/connected socket.
         * The workaround is to drop passive discovery, which drastically
         * reduce the probability of this happening.
         * Jean II */
        if(mode == DISCOVERY_PASSIVE)
                return;

        info.daddr = discovery->daddr;
        info.saddr = discovery->saddr;

        /* FIXME. We have a locking problem on the hashbin here.
         * We probably need to use hashbin_find_next(), but we first
         * need to ensure that "line" is unique. - Jean II */
        self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
        while (self != NULL) {
                IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
                
                ircomm_tty_do_event(self, IRCOMM_TTY_DISCOVERY_INDICATION, 
                                    NULL, &info);

                self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
        }
}

/*
 * Function ircomm_tty_disconnect_indication (instance, sap, reason, skb)
 *
 *    Link disconnected
 *
 */
void ircomm_tty_disconnect_indication(void *instance, void *sap, 
                                      LM_REASON reason,
                                      struct sk_buff *skb)
{
        struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;

        IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

        IRDA_ASSERT(self != NULL, return;);
        IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);

        if (!self->tty)
                return;

        /* This will stop control data transfers */
        self->flow = FLOW_STOP;

        /* Stop data transfers */
        self->tty->hw_stopped = 1;

        ircomm_tty_do_event(self, IRCOMM_TTY_DISCONNECT_INDICATION, NULL, 
                            NULL);
}

/*
 * Function ircomm_tty_getvalue_confirm (result, obj_id, value, priv)
 *
 *    Got result from the IAS query we make
 *
 */
static void ircomm_tty_getvalue_confirm(int result, __u16 obj_id, 
                                        struct ias_value *value, 
                                        void *priv)
{
        struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) priv;

        IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

        IRDA_ASSERT(self != NULL, return;);
        IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);

        /* We probably don't need to make any more queries */
        iriap_close(self->iriap);
        self->iriap = NULL;

        /* Check if request succeeded */
        if (result != IAS_SUCCESS) {
                IRDA_DEBUG(4, "%s(), got NULL value!\n", __FUNCTION__ );
                return;
        }

        switch (value->type) {
        case IAS_OCT_SEQ:
                IRDA_DEBUG(2, "%s(), got octet sequence\n", __FUNCTION__ );

                irda_param_extract_all(self, value->t.oct_seq, value->len,
                                       &ircomm_param_info);

                ircomm_tty_do_event(self, IRCOMM_TTY_GOT_PARAMETERS, NULL, 
                                    NULL);
                break;
        case IAS_INTEGER:
                /* Got LSAP selector */ 
                IRDA_DEBUG(2, "%s(), got lsapsel = %d\n", __FUNCTION__ , 
                           value->t.integer);

                if (value->t.integer == -1) {
                        IRDA_DEBUG(0, "%s(), invalid value!\n", __FUNCTION__ );
                } else
                        self->dlsap_sel = value->t.integer;

                ircomm_tty_do_event(self, IRCOMM_TTY_GOT_LSAPSEL, NULL, NULL);
                break;
        case IAS_MISSING:
                IRDA_DEBUG(0, "%s(), got IAS_MISSING\n", __FUNCTION__ );
                break;
        default:
                IRDA_DEBUG(0, "%s(), got unknown type!\n", __FUNCTION__ );
                break;
        }
        irias_delete_value(value);
}

/*
 * Function ircomm_tty_connect_confirm (instance, sap, qos, max_sdu_size, skb)
 *
 *    Connection confirmed
 *
 */
void ircomm_tty_connect_confirm(void *instance, void *sap, 
                                struct qos_info *qos, 
                                __u32 max_data_size, 
                                __u8 max_header_size, 
                                struct sk_buff *skb)
{
        struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;

        IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

        IRDA_ASSERT(self != NULL, return;);
        IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);

        self->client = TRUE;
        self->max_data_size = max_data_size;
        self->max_header_size = max_header_size;
        self->flow = FLOW_START;

        ircomm_tty_do_event(self, IRCOMM_TTY_CONNECT_CONFIRM, NULL, NULL);

        /* No need to kfree_skb - see ircomm_ttp_connect_confirm() */
}

/*
 * Function ircomm_tty_connect_indication (instance, sap, qos, max_sdu_size, 
 *                                         skb)
 *
 *    we are discovered and being requested to connect by remote device !
 *
 */
void ircomm_tty_connect_indication(void *instance, void *sap, 
                                   struct qos_info *qos, 
                                   __u32 max_data_size,
                                   __u8 max_header_size, 
                                   struct sk_buff *skb)
{
        struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
        int clen;

        IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

        IRDA_ASSERT(self != NULL, return;);
        IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);

        self->client = FALSE;
        self->max_data_size = max_data_size;
        self->max_header_size = max_header_size;
        self->flow = FLOW_START;

        clen = skb->data[0];
        if (clen)
                irda_param_extract_all(self, skb->data+1, 
                                       IRDA_MIN(skb->len, clen), 
                                       &ircomm_param_info);

        ircomm_tty_do_event(self, IRCOMM_TTY_CONNECT_INDICATION, NULL, NULL);

        /* No need to kfree_skb - see ircomm_ttp_connect_indication() */
}

/*
 * Function ircomm_tty_link_established (self)
 *
 *    Called when the IrCOMM link is established
 *
 */
void ircomm_tty_link_established(struct ircomm_tty_cb *self)
{
        IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

        IRDA_ASSERT(self != NULL, return;);
        IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);

        if (!self->tty)
                return;
        
        del_timer(&self->watchdog_timer);

        /* 
         * IrCOMM link is now up, and if we are not using hardware
         * flow-control, then declare the hardware as running. Otherwise we
         * will have to wait for the peer device (DCE) to raise the CTS
         * line.  
         */
        if ((self->flags & ASYNC_CTS_FLOW) && ((self->settings.dce & IRCOMM_CTS) == 0)) {
                IRDA_DEBUG(0, "%s(), waiting for CTS ...\n", __FUNCTION__ );
                return;
        } else {
                IRDA_DEBUG(1, "%s(), starting hardware!\n", __FUNCTION__ );

                self->tty->hw_stopped = 0;
        
                /* Wake up processes blocked on open */
                wake_up_interruptible(&self->open_wait);
        }

        schedule_work(&self->tqueue);
}

/*
 * Function ircomm_tty_start_watchdog_timer (self, timeout)
 *
 *    Start the watchdog timer. This timer is used to make sure that any 
 *    connection attempt is successful, and if not, we will retry after 
 *    the timeout
 */
static void ircomm_tty_start_watchdog_timer(struct ircomm_tty_cb *self,
                                            int timeout)
{
        IRDA_ASSERT(self != NULL, return;);
        IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);

        irda_start_timer(&self->watchdog_timer, timeout, (void *) self,
                         ircomm_tty_watchdog_timer_expired);
}

/*
 * Function ircomm_tty_watchdog_timer_expired (data)
 *
 *    Called when the connect procedure have taken to much time.
 *
 */
static void ircomm_tty_watchdog_timer_expired(void *data)
{
        struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) data;
        
        IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

        IRDA_ASSERT(self != NULL, return;);
        IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);

        ircomm_tty_do_event(self, IRCOMM_TTY_WD_TIMER_EXPIRED, NULL, NULL);
}


/*
 * Function ircomm_tty_do_event (self, event, skb)
 *
 *    Process event
 *
 */
int ircomm_tty_do_event(struct ircomm_tty_cb *self, IRCOMM_TTY_EVENT event,
                        struct sk_buff *skb, struct ircomm_tty_info *info) 
{
        IRDA_ASSERT(self != NULL, return -1;);
        IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);

        IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __FUNCTION__ ,
                   ircomm_tty_state[self->state], ircomm_tty_event[event]);
        
        return (*state[self->state])(self, event, skb, info);
}

/*
 * Function ircomm_tty_next_state (self, state)
 *
 *    Switch state
 *
 */
static inline void ircomm_tty_next_state(struct ircomm_tty_cb *self, IRCOMM_TTY_STATE state)
{
        /*
        IRDA_ASSERT(self != NULL, return;);
        IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);

        IRDA_DEBUG(2, "%s: next state=%s, service type=%d\n", __FUNCTION__ , 
                   ircomm_tty_state[self->state], self->service_type);
        */
        self->state = state;
}

/*
 * Function ircomm_tty_state_idle (self, event, skb, info)
 *
 *    Just hanging around
 *
 */
static int ircomm_tty_state_idle(struct ircomm_tty_cb *self, 
                                 IRCOMM_TTY_EVENT event, 
                                 struct sk_buff *skb, 
                                 struct ircomm_tty_info *info)
{
        int ret = 0;

        IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __FUNCTION__ ,
                   ircomm_tty_state[self->state], ircomm_tty_event[event]);
        switch (event) {
        case IRCOMM_TTY_ATTACH_CABLE:
                /* Try to discover any remote devices */                
                ircomm_tty_start_watchdog_timer(self, 3*HZ);
                ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
                
                irlmp_discovery_request(DISCOVERY_DEFAULT_SLOTS);
                break;
        case IRCOMM_TTY_DISCOVERY_INDICATION:
                self->daddr = info->daddr;
                self->saddr = info->saddr;

                if (self->iriap) {
                        IRDA_WARNING("%s(), busy with a previous query\n",
                                     __FUNCTION__);
                        return -EBUSY;
                }

                self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
                                         ircomm_tty_getvalue_confirm);

                iriap_getvaluebyclass_request(self->iriap,
                                              self->saddr, self->daddr,
                                              "IrDA:IrCOMM", "Parameters");
                
                ircomm_tty_start_watchdog_timer(self, 3*HZ);
                ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_PARAMETERS);
                break;
        case IRCOMM_TTY_CONNECT_INDICATION:
                del_timer(&self->watchdog_timer);

                /* Accept connection */
                ircomm_connect_response(self->ircomm, NULL);
                ircomm_tty_next_state(self, IRCOMM_TTY_READY);
                break;
        case IRCOMM_TTY_WD_TIMER_EXPIRED:
                /* Just stay idle */
                break;
        case IRCOMM_TTY_DETACH_CABLE:
                ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
                break;
        default:
                IRDA_DEBUG(2, "%s(), unknown event: %s\n", __FUNCTION__ ,
                           ircomm_tty_event[event]);
                ret = -EINVAL;
        }
        return ret;
}

/*
 * Function ircomm_tty_state_search (self, event, skb, info)
 *
 *    Trying to discover an IrCOMM device
 *
 */
static int ircomm_tty_state_search(struct ircomm_tty_cb *self, 
                                   IRCOMM_TTY_EVENT event, 
                                   struct sk_buff *skb, 
                                   struct ircomm_tty_info *info)
{
        int ret = 0;

        IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __FUNCTION__ ,
                   ircomm_tty_state[self->state], ircomm_tty_event[event]);

        switch (event) {
        case IRCOMM_TTY_DISCOVERY_INDICATION:
                self->daddr = info->daddr;
                self->saddr = info->saddr;

                if (self->iriap) {
                        IRDA_WARNING("%s(), busy with a previous query\n",
                                     __FUNCTION__);
                        return -EBUSY;
                }
                
                self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
                                         ircomm_tty_getvalue_confirm);
                
                if (self->service_type == IRCOMM_3_WIRE_RAW) {
                        iriap_getvaluebyclass_request(self->iriap, self->saddr,
                                                      self->daddr, "IrLPT", 
                                                      "IrDA:IrLMP:LsapSel");
                        ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_LSAP_SEL);
                } else {
                        iriap_getvaluebyclass_request(self->iriap, self->saddr,
                                                      self->daddr, 
                                                      "IrDA:IrCOMM", 
                                                      "Parameters");

                        ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_PARAMETERS);
                }
                ircomm_tty_start_watchdog_timer(self, 3*HZ);
                break;
        case IRCOMM_TTY_CONNECT_INDICATION:
                del_timer(&self->watchdog_timer);
                ircomm_tty_ias_unregister(self);

                /* Accept connection */
                ircomm_connect_response(self->ircomm, NULL);
                ircomm_tty_next_state(self, IRCOMM_TTY_READY);
                break;
        case IRCOMM_TTY_WD_TIMER_EXPIRED:
#if 1
                /* Give up */
#else
                /* Try to discover any remote devices */                
                ircomm_tty_start_watchdog_timer(self, 3*HZ);
                irlmp_discovery_request(DISCOVERY_DEFAULT_SLOTS);
#endif
                break;
        case IRCOMM_TTY_DETACH_CABLE:
                ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
                break;
        default:
                IRDA_DEBUG(2, "%s(), unknown event: %s\n", __FUNCTION__ ,
                           ircomm_tty_event[event]);
                ret = -EINVAL;
        }
        return ret;
}

/*
 * Function ircomm_tty_state_query (self, event, skb, info)
 *
 *    Querying the remote LM-IAS for IrCOMM parameters
 *
 */
static int ircomm_tty_state_query_parameters(struct ircomm_tty_cb *self, 
                                             IRCOMM_TTY_EVENT event, 
                                             struct sk_buff *skb, 
                                             struct ircomm_tty_info *info)
{
        int ret = 0;

        IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __FUNCTION__ ,
                   ircomm_tty_state[self->state], ircomm_tty_event[event]);

        switch (event) {
        case IRCOMM_TTY_GOT_PARAMETERS:
                if (self->iriap) {
                        IRDA_WARNING("%s(), busy with a previous query\n",
                                     __FUNCTION__);
                        return -EBUSY;
                }
                
                self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
                                         ircomm_tty_getvalue_confirm);

                iriap_getvaluebyclass_request(self->iriap, self->saddr, 
                                              self->daddr, "IrDA:IrCOMM", 
                                              "IrDA:TinyTP:LsapSel");

                ircomm_tty_start_watchdog_timer(self, 3*HZ);
                ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_LSAP_SEL);
                break;
        case IRCOMM_TTY_WD_TIMER_EXPIRED:
                /* Go back to search mode */
                ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
                ircomm_tty_start_watchdog_timer(self, 3*HZ); 
                break;
        case IRCOMM_TTY_CONNECT_INDICATION:
                del_timer(&self->watchdog_timer);
                ircomm_tty_ias_unregister(self);

                /* Accept connection */
                ircomm_connect_response(self->ircomm, NULL);
                ircomm_tty_next_state(self, IRCOMM_TTY_READY);
                break;
        case IRCOMM_TTY_DETACH_CABLE:
                ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
                break;
        default:
                IRDA_DEBUG(2, "%s(), unknown event: %s\n", __FUNCTION__ ,
                           ircomm_tty_event[event]);
                ret = -EINVAL;
        }
        return ret;
}

/*
 * Function ircomm_tty_state_query_lsap_sel (self, event, skb, info)
 *
 *    Query remote LM-IAS for the LSAP selector which we can connect to
 *
 */
static int ircomm_tty_state_query_lsap_sel(struct ircomm_tty_cb *self, 
                                           IRCOMM_TTY_EVENT event, 
                                           struct sk_buff *skb, 
                                           struct ircomm_tty_info *info)
{
        int ret = 0;

        IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __FUNCTION__ ,
                   ircomm_tty_state[self->state], ircomm_tty_event[event]);

        switch (event) {
        case IRCOMM_TTY_GOT_LSAPSEL:
                /* Connect to remote device */
                ret = ircomm_connect_request(self->ircomm, self->dlsap_sel,
                                             self->saddr, self->daddr, 
                                             NULL, self->service_type);
                ircomm_tty_start_watchdog_timer(self, 3*HZ);
                ircomm_tty_next_state(self, IRCOMM_TTY_SETUP);
                break;
        case IRCOMM_TTY_WD_TIMER_EXPIRED:
                /* Go back to search mode */
                ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
                ircomm_tty_start_watchdog_timer(self, 3*HZ);
                break;
        case IRCOMM_TTY_CONNECT_INDICATION:
                del_timer(&self->watchdog_timer);
                ircomm_tty_ias_unregister(self);

                /* Accept connection */
                ircomm_connect_response(self->ircomm, NULL);
                ircomm_tty_next_state(self, IRCOMM_TTY_READY);
                break;
        case IRCOMM_TTY_DETACH_CABLE:
                ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
                break;
        default:
                IRDA_DEBUG(2, "%s(), unknown event: %s\n", __FUNCTION__ ,
                           ircomm_tty_event[event]);
                ret = -EINVAL;
        }
        return ret;
}

/*
 * Function ircomm_tty_state_setup (self, event, skb, info)
 *
 *    Trying to connect
 *
 */
static int ircomm_tty_state_setup(struct ircomm_tty_cb *self, 
                                  IRCOMM_TTY_EVENT event, 
                                  struct sk_buff *skb, 
                                  struct ircomm_tty_info *info)
{
        int ret = 0;

        IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __FUNCTION__ ,
                   ircomm_tty_state[self->state], ircomm_tty_event[event]);

        switch (event) {
        case IRCOMM_TTY_CONNECT_CONFIRM:
                del_timer(&self->watchdog_timer);
                ircomm_tty_ias_unregister(self);
                
                /* 
                 * Send initial parameters. This will also send out queued
                 * parameters waiting for the connection to come up 
                 */
                ircomm_tty_send_initial_parameters(self);
                ircomm_tty_link_established(self);
                ircomm_tty_next_state(self, IRCOMM_TTY_READY);
                break;
        case IRCOMM_TTY_CONNECT_INDICATION:
                del_timer(&self->watchdog_timer);
                ircomm_tty_ias_unregister(self);
                
                /* Accept connection */
                ircomm_connect_response(self->ircomm, NULL);
                ircomm_tty_next_state(self, IRCOMM_TTY_READY);
                break;
        case IRCOMM_TTY_WD_TIMER_EXPIRED:
                /* Go back to search mode */
                ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
                ircomm_tty_start_watchdog_timer(self, 3*HZ);
                break;
        case IRCOMM_TTY_DETACH_CABLE:
                /* ircomm_disconnect_request(self->ircomm, NULL); */
                ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
                break;
        default:
                IRDA_DEBUG(2, "%s(), unknown event: %s\n", __FUNCTION__ ,
                           ircomm_tty_event[event]);
                ret = -EINVAL;
        }
        return ret;
}

/*
 * Function ircomm_tty_state_ready (self, event, skb, info)
 *
 *    IrCOMM is now connected
 *
 */
static int ircomm_tty_state_ready(struct ircomm_tty_cb *self, 
                                  IRCOMM_TTY_EVENT event, 
                                  struct sk_buff *skb, 
                                  struct ircomm_tty_info *info)
{
        int ret = 0;

        switch (event) {
        case IRCOMM_TTY_DATA_REQUEST:
                ret = ircomm_data_request(self->ircomm, skb);
                break;          
        case IRCOMM_TTY_DETACH_CABLE:
                ircomm_disconnect_request(self->ircomm, NULL);
                ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
                break;
        case IRCOMM_TTY_DISCONNECT_INDICATION:
                ircomm_tty_ias_register(self);
                ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
                ircomm_tty_start_watchdog_timer(self, 3*HZ);

                if (self->flags & ASYNC_CHECK_CD) {
                        /* Drop carrier */
                        self->settings.dce = IRCOMM_DELTA_CD;
                        ircomm_tty_check_modem_status(self);
                } else {
                        IRDA_DEBUG(0, "%s(), hanging up!\n", __FUNCTION__ );
                        if (self->tty)
                                tty_hangup(self->tty);
                }
                break;
        default:
                IRDA_DEBUG(2, "%s(), unknown event: %s\n", __FUNCTION__ ,
                           ircomm_tty_event[event]);
                ret = -EINVAL;
        }
        return ret;
}