net/irda/ircomm/ircomm_event.c

/*********************************************************************
 *
 * Filename:      ircomm_event.c
 * Version:       1.0
 * Description:   IrCOMM layer state machine
 * Status:        Stable
 * Author:        Dag Brattli <dagb@cs.uit.no>
 * Created at:    Sun Jun  6 20:33:11 1999
 * Modified at:   Sun Dec 12 13:44:32 1999
 * Modified by:   Dag Brattli <dagb@cs.uit.no>
 *
 *     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, see <http://www.gnu.org/licenses/>.
 *
 ********************************************************************/

#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",
};

static const char *const ircomm_event[] __maybe_unused = {
	"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",
};

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:
		pr_debug("%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:
		pr_debug("%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:
		pr_debug("%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:
		pr_debug("%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)
{
	pr_debug("%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;

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