ircomm_lmp.c

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/*********************************************************************
 *                
 * Filename:      ircomm_lmp.c
 * Version:       1.0
 * Description:   Interface between IrCOMM and IrLMP
 * Status:        Stable
 * Author:        Dag Brattli <dagb@cs.uit.no>
 * Created at:    Sun Jun  6 20:48:27 1999
 * Modified at:   Sun Dec 12 13:44:17 1999
 * Modified by:   Dag Brattli <dagb@cs.uit.no>
 * Sources:       Previous IrLPT work by Thomas Davis
 * 
 *     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/sched.h>
#include <linux/init.h>

#include <net/irda/irda.h>
#include <net/irda/irlmp.h>
#include <net/irda/iriap.h>

#include <net/irda/ircomm_event.h>
#include <net/irda/ircomm_lmp.h>

/*
 * Function ircomm_open_lsap (self)
 *
 *    Open LSAP. This function will only be used when using "raw" services
 *
 */
int ircomm_open_lsap(struct ircomm_cb *self)
{
        notify_t notify;
        
        IRDA_DEBUG(0, __FUNCTION__ "()\n");
        
        /* Register callbacks */
        irda_notify_init(&notify);
        notify.data_indication       = ircomm_lmp_data_indication;
        notify.connect_confirm       = ircomm_lmp_connect_confirm;
        notify.connect_indication    = ircomm_lmp_connect_indication;
        notify.disconnect_indication = ircomm_lmp_disconnect_indication;
        notify.instance = self;
        strncpy(notify.name, "IrCOMM", NOTIFY_MAX_NAME);

        self->lsap = irlmp_open_lsap(LSAP_ANY, &notify, 0);
        if (!self->lsap) {
                IRDA_DEBUG(0,__FUNCTION__"failed to allocate tsap\n");
                return -1;
        }
        self->slsap_sel = self->lsap->slsap_sel;

        /*
         *  Initialize the call-table for issuing commands
         */
        self->issue.data_request       = ircomm_lmp_data_request;
        self->issue.connect_request    = ircomm_lmp_connect_request;
        self->issue.connect_response   = ircomm_lmp_connect_response;
        self->issue.disconnect_request = ircomm_lmp_disconnect_request;

        return 0;
}

/*
 * Function ircomm_lmp_connect_request (self, userdata)
 *
 *    
 *
 */
int ircomm_lmp_connect_request(struct ircomm_cb *self, 
                               struct sk_buff *userdata, 
                               struct ircomm_info *info)
{
        int ret = 0;

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

        ret = irlmp_connect_request(self->lsap, info->dlsap_sel,
                                    info->saddr, info->daddr, NULL, userdata); 
        return ret;
}       

/*
 * Function ircomm_lmp_connect_response (self, skb)
 *
 *    
 *
 */
int ircomm_lmp_connect_response(struct ircomm_cb *self, struct sk_buff *skb)
{
        int ret;

        IRDA_DEBUG(0, __FUNCTION__"()\n");
        
        ret = irlmp_connect_response(self->lsap, skb);

        return 0;
}

int ircomm_lmp_disconnect_request(struct ircomm_cb *self, 
                                  struct sk_buff *userdata, 
                                  struct ircomm_info *info)
{
        struct sk_buff *skb;
        int ret;

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

        if (!userdata) {
                skb = dev_alloc_skb(64);
                if (!skb)
                        return -ENOMEM;
                
                /*  Reserve space for MUX and LAP header */
                skb_reserve(skb, LMP_MAX_HEADER);               
                userdata = skb;
        }
        ret = irlmp_disconnect_request(self->lsap, userdata);

        return ret;
}

/*
 * Function ircomm_lmp_flow_control (skb)
 *
 *    This function is called when a data frame we have sent to IrLAP has
 *    been deallocated. We do this to make sure we don't flood IrLAP with 
 *    frames, since we are not using the IrTTP flow control mechanism
 */
void ircomm_lmp_flow_control(struct sk_buff *skb)
{
        struct irda_skb_cb *cb;
        struct ircomm_cb *self;
        int line;

        ASSERT(skb != NULL, return;);

        cb = (struct irda_skb_cb *) skb->cb;

        IRDA_DEBUG(2, __FUNCTION__ "()\n");
 
        line = cb->line;

        self = (struct ircomm_cb *) hashbin_find(ircomm, line, NULL);
        if (!self) {
                IRDA_DEBUG(2, __FUNCTION__ "(), didn't find myself\n");
                return;
        }

        ASSERT(self != NULL, return;);
        ASSERT(self->magic == IRCOMM_MAGIC, return;);

        self->pkt_count--;

        if ((self->pkt_count < 2) && (self->flow_status == FLOW_STOP)) {
                IRDA_DEBUG(2, __FUNCTION__ "(), asking TTY to start again!\n");
                self->flow_status = FLOW_START;
                if (self->notify.flow_indication)
                        self->notify.flow_indication(self->notify.instance, 
                                                     self, FLOW_START);
        }
}
    
/*
 * Function ircomm_lmp_data_request (self, userdata)
 *
 *    Send data frame to peer device
 *
 */
int ircomm_lmp_data_request(struct ircomm_cb *self, struct sk_buff *skb, 
                            int not_used)
{
        struct irda_skb_cb *cb;
        int ret;

        ASSERT(skb != NULL, return -1;);

        cb = (struct irda_skb_cb *) skb->cb;
        
        cb->line = self->line;

        IRDA_DEBUG(4, __FUNCTION__"(), sending frame\n");

        skb->destructor = ircomm_lmp_flow_control;
        
        if ((self->pkt_count++ > 7) && (self->flow_status == FLOW_START)) {
                IRDA_DEBUG(2, __FUNCTION__ "(), asking TTY to slow down!\n");
                self->flow_status = FLOW_STOP;
                if (self->notify.flow_indication)
                        self->notify.flow_indication(self->notify.instance, 
                                                     self, FLOW_STOP);
        }
        ret = irlmp_data_request(self->lsap, skb);
        if (ret) {
                ERROR(__FUNCTION__ "(), failed\n");
                dev_kfree_skb(skb);
        }

        return ret;
}

/*
 * Function ircomm_lmp_data_indication (instance, sap, skb)
 *
 *    Incomming data which we must deliver to the state machine, to check
 *    we are still connected.
 */
int ircomm_lmp_data_indication(void *instance, void *sap,
                               struct sk_buff *skb)
{
        struct ircomm_cb *self = (struct ircomm_cb *) instance;

        IRDA_DEBUG(4, __FUNCTION__"()\n");
        
        ASSERT(self != NULL, return -1;);
        ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
        ASSERT(skb != NULL, return -1;);
        
        ircomm_do_event(self, IRCOMM_LMP_DATA_INDICATION, skb, NULL);

        return 0;
}

/*
 * Function ircomm_lmp_connect_confirm (instance, sap, qos, max_sdu_size, 
 *                                       max_header_size, skb)
 *
 *    Connection has been confirmed by peer device
 *
 */
void ircomm_lmp_connect_confirm(void *instance, void *sap,
                                struct qos_info *qos, 
                                __u32 max_seg_size, 
                                __u8 max_header_size,
                                struct sk_buff *skb)
{
        struct ircomm_cb *self = (struct ircomm_cb *) instance;
        struct ircomm_info info;

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

        ASSERT(self != NULL, return;);
        ASSERT(self->magic == IRCOMM_MAGIC, return;);
        ASSERT(skb != NULL, return;);
        ASSERT(qos != NULL, return;);

        info.max_data_size = max_seg_size;
        info.max_header_size = max_header_size;
        info.qos = qos;

        ircomm_do_event(self, IRCOMM_LMP_CONNECT_CONFIRM, skb, &info);
}

/*
 * Function ircomm_lmp_connect_indication (instance, sap, qos, max_sdu_size,
 *                                         max_header_size, skb)
 *
 *    Peer device wants to make a connection with us
 *
 */
void ircomm_lmp_connect_indication(void *instance, void *sap,
                                   struct qos_info *qos,
                                   __u32 max_seg_size,
                                   __u8 max_header_size,
                                   struct sk_buff *skb)
{
        struct ircomm_cb *self = (struct ircomm_cb *)instance;
        struct ircomm_info info;

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

        ASSERT(self != NULL, return;);
        ASSERT(self->magic == IRCOMM_MAGIC, return;);
        ASSERT(skb != NULL, return;);
        ASSERT(qos != NULL, return;);

        info.max_data_size = max_seg_size;
        info.max_header_size = max_header_size;
        info.qos = qos;

        ircomm_do_event(self, IRCOMM_LMP_CONNECT_INDICATION, skb, &info);
}

/*
 * Function ircomm_lmp_disconnect_indication (instance, sap, reason, skb)
 *
 *    Peer device has closed the connection, or the link went down for some
 *    other reason
 */
void ircomm_lmp_disconnect_indication(void *instance, void *sap, 
                                      LM_REASON reason,
                                      struct sk_buff *skb)
{
        struct ircomm_cb *self = (struct ircomm_cb *) instance;
        struct ircomm_info info;

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

        ASSERT(self != NULL, return;);
        ASSERT(self->magic == IRCOMM_MAGIC, return;);

        info.reason = reason;

        ircomm_do_event(self, IRCOMM_LMP_DISCONNECT_INDICATION, skb, &info);
}

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