ircomm_event.c

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/*********************************************************************
 *
 * Filename:      ircomm_event.c
 * Version:       1.0
 * Description:   IrCOMM layer state machine
 * Status:        Stable
 * Author:        Dag Brattli <[email protected]>
 * Created at:    Sun Jun  6 20:33:11 1999
 * Modified at:   Sun Dec 12 13:44:32 1999
 * Modified by:   Dag Brattli <[email protected]>
 *
 *     Copyright (c) 1999 Dag Brattli, All Rights Reserved.
 *
 *     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/proc_fs.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/ircomm_core.h>
#include <net/irda/ircomm_event.h>

static int ircomm_state_idle(struct ircomm_cb *self, IRCOMM_EVENT event,
                 struct sk_buff *skb, struct ircomm_info *info);
static int ircomm_state_waiti(struct ircomm_cb *self, IRCOMM_EVENT event,
                  struct sk_buff *skb, struct ircomm_info *info);
static int ircomm_state_waitr(struct ircomm_cb *self, IRCOMM_EVENT event,
                  struct sk_buff *skb, struct ircomm_info *info);
static int ircomm_state_conn(struct ircomm_cb *self, IRCOMM_EVENT event,
                 struct sk_buff *skb, struct ircomm_info *info);

const char *const ircomm_state[] = {
    "IRCOMM_IDLE",
    "IRCOMM_WAITI",
    "IRCOMM_WAITR",
    "IRCOMM_CONN",
};

#ifdef CONFIG_IRDA_DEBUG
static const char *const ircomm_event[] = {
    "IRCOMM_CONNECT_REQUEST",
    "IRCOMM_CONNECT_RESPONSE",
    "IRCOMM_TTP_CONNECT_INDICATION",
    "IRCOMM_LMP_CONNECT_INDICATION",
    "IRCOMM_TTP_CONNECT_CONFIRM",
    "IRCOMM_LMP_CONNECT_CONFIRM",

    "IRCOMM_LMP_DISCONNECT_INDICATION",
    "IRCOMM_TTP_DISCONNECT_INDICATION",
    "IRCOMM_DISCONNECT_REQUEST",

    "IRCOMM_TTP_DATA_INDICATION",
    "IRCOMM_LMP_DATA_INDICATION",
    "IRCOMM_DATA_REQUEST",
    "IRCOMM_CONTROL_REQUEST",
    "IRCOMM_CONTROL_INDICATION",
};
#endif /* CONFIG_IRDA_DEBUG */

static int (*state[])(struct ircomm_cb *self, IRCOMM_EVENT event,
              struct sk_buff *skb, struct ircomm_info *info) =
{
    ircomm_state_idle,
    ircomm_state_waiti,
    ircomm_state_waitr,
    ircomm_state_conn,
};

/*
 * Function ircomm_state_idle (self, event, skb)
 *
 *    IrCOMM is currently idle
 *
 */
static int ircomm_state_idle(struct ircomm_cb *self, IRCOMM_EVENT event,
                 struct sk_buff *skb, struct ircomm_info *info)
{
    int ret = 0;

    switch (event) {
    case IRCOMM_CONNECT_REQUEST:
        ircomm_next_state(self, IRCOMM_WAITI);
        ret = self->issue.connect_request(self, skb, info);
        break;
    case IRCOMM_TTP_CONNECT_INDICATION:
    case IRCOMM_LMP_CONNECT_INDICATION:
        ircomm_next_state(self, IRCOMM_WAITR);
        ircomm_connect_indication(self, skb, info);
        break;
    default:
        IRDA_DEBUG(4, "%s(), unknown event: %s\n", __func__ ,
               ircomm_event[event]);
        ret = -EINVAL;
    }
    return ret;
}

/*
 * Function ircomm_state_waiti (self, event, skb)
 *
 *    The IrCOMM user has requested an IrCOMM connection to the remote
 *    device and is awaiting confirmation
 */
static int ircomm_state_waiti(struct ircomm_cb *self, IRCOMM_EVENT event,
                  struct sk_buff *skb, struct ircomm_info *info)
{
    int ret = 0;

    switch (event) {
    case IRCOMM_TTP_CONNECT_CONFIRM:
    case IRCOMM_LMP_CONNECT_CONFIRM:
        ircomm_next_state(self, IRCOMM_CONN);
        ircomm_connect_confirm(self, skb, info);
        break;
    case IRCOMM_TTP_DISCONNECT_INDICATION:
    case IRCOMM_LMP_DISCONNECT_INDICATION:
        ircomm_next_state(self, IRCOMM_IDLE);
        ircomm_disconnect_indication(self, skb, info);
        break;
    default:
        IRDA_DEBUG(0, "%s(), unknown event: %s\n", __func__ ,
               ircomm_event[event]);
        ret = -EINVAL;
    }
    return ret;
}

/*
 * Function ircomm_state_waitr (self, event, skb)
 *
 *    IrCOMM has received an incoming connection request and is awaiting
 *    response from the user
 */
static int ircomm_state_waitr(struct ircomm_cb *self, IRCOMM_EVENT event,
                  struct sk_buff *skb, struct ircomm_info *info)
{
    int ret = 0;

    switch (event) {
    case IRCOMM_CONNECT_RESPONSE:
        ircomm_next_state(self, IRCOMM_CONN);
        ret = self->issue.connect_response(self, skb);
        break;
    case IRCOMM_DISCONNECT_REQUEST:
        ircomm_next_state(self, IRCOMM_IDLE);
        ret = self->issue.disconnect_request(self, skb, info);
        break;
    case IRCOMM_TTP_DISCONNECT_INDICATION:
    case IRCOMM_LMP_DISCONNECT_INDICATION:
        ircomm_next_state(self, IRCOMM_IDLE);
        ircomm_disconnect_indication(self, skb, info);
        break;
    default:
        IRDA_DEBUG(0, "%s(), unknown event = %s\n", __func__ ,
               ircomm_event[event]);
        ret = -EINVAL;
    }
    return ret;
}

/*
 * Function ircomm_state_conn (self, event, skb)
 *
 *    IrCOMM is connected to the peer IrCOMM device
 *
 */
static int ircomm_state_conn(struct ircomm_cb *self, IRCOMM_EVENT event,
                 struct sk_buff *skb, struct ircomm_info *info)
{
    int ret = 0;

    switch (event) {
    case IRCOMM_DATA_REQUEST:
        ret = self->issue.data_request(self, skb, 0);
        break;
    case IRCOMM_TTP_DATA_INDICATION:
        ircomm_process_data(self, skb);
        break;
    case IRCOMM_LMP_DATA_INDICATION:
        ircomm_data_indication(self, skb);
        break;
    case IRCOMM_CONTROL_REQUEST:
        /* Just send a separate frame for now */
        ret = self->issue.data_request(self, skb, skb->len);
        break;
    case IRCOMM_TTP_DISCONNECT_INDICATION:
    case IRCOMM_LMP_DISCONNECT_INDICATION:
        ircomm_next_state(self, IRCOMM_IDLE);
        ircomm_disconnect_indication(self, skb, info);
        break;
    case IRCOMM_DISCONNECT_REQUEST:
        ircomm_next_state(self, IRCOMM_IDLE);
        ret = self->issue.disconnect_request(self, skb, info);
        break;
    default:
        IRDA_DEBUG(0, "%s(), unknown event = %s\n", __func__ ,
               ircomm_event[event]);
        ret = -EINVAL;
    }
    return ret;
}

/*
 * Function ircomm_do_event (self, event, skb)
 *
 *    Process event
 *
 */
int ircomm_do_event(struct ircomm_cb *self, IRCOMM_EVENT event,
            struct sk_buff *skb, struct ircomm_info *info)
{
    IRDA_DEBUG(4, "%s: state=%s, event=%s\n", __func__ ,
           ircomm_state[self->state], ircomm_event[event]);

    return (*state[self->state])(self, event, skb, info);
}

/*
 * Function ircomm_next_state (self, state)
 *
 *    Switch state
 *
 */
void ircomm_next_state(struct ircomm_cb *self, IRCOMM_STATE state)
{
    self->state = state;

    IRDA_DEBUG(4, "%s: next state=%s, service type=%d\n", __func__ ,
           ircomm_state[self->state], self->service_type);
}