text: /*********************************************************************
   *                
   * Filename:      ircomm_ttp.c
   * Version:       1.0
   * Description:   Interface between IrCOMM and IrTTP
   * Status:        Stable
   * Author:        Dag Brattli <dagb@cs.uit.no>
   * Created at:    Sun Jun  6 20:48:27 1999
   * Modified at:   Mon Dec 13 11:35:13 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, 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/ircomm_event.h>
  #include <net/irda/ircomm_ttp.h>
  
  /*
   * Function ircomm_open_tsap (self)
   *
   *    
   *
   */
  int ircomm_open_tsap(struct ircomm_cb *self)
  {
  	notify_t notify;
  
  	IRDA_DEBUG(4, __FUNCTION__ "()\n");
  
  	/* Register callbacks */
  	irda_notify_init(&notify);
  	notify.data_indication       = ircomm_ttp_data_indication;
  	notify.connect_confirm       = ircomm_ttp_connect_confirm;
  	notify.connect_indication    = ircomm_ttp_connect_indication;
  	notify.flow_indication       = ircomm_ttp_flow_indication;
  	notify.disconnect_indication = ircomm_ttp_disconnect_indication;
  	notify.instance = self;
  	strncpy(notify.name, "IrCOMM", NOTIFY_MAX_NAME);
  
  	self->tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT,
  				     &notify);
  	if (!self->tsap) {
  		IRDA_DEBUG(0, __FUNCTION__"failed to allocate tsap\n");
  		return -1;
  	}
  	self->slsap_sel = self->tsap->stsap_sel;
  
  	/*
  	 *  Initialize the call-table for issuing commands
  	 */
  	self->issue.data_request       = ircomm_ttp_data_request;
  	self->issue.connect_request    = ircomm_ttp_connect_request;
  	self->issue.connect_response   = ircomm_ttp_connect_response;
  	self->issue.disconnect_request = ircomm_ttp_disconnect_request;
  
  	return 0;
  }
  
  /*
   * Function ircomm_ttp_connect_request (self, userdata)
   *
   *    
   *
   */
  int ircomm_ttp_connect_request(struct ircomm_cb *self, 
  			       struct sk_buff *userdata, 
  			       struct ircomm_info *info)
  {
  	int ret = 0;
  
  	IRDA_DEBUG(4, __FUNCTION__ "()\n");
  
  	ret = irttp_connect_request(self->tsap, info->dlsap_sel,
  				    info->saddr, info->daddr, NULL, 
  				    TTP_SAR_DISABLE, userdata); 
  	return ret;
  }	
  
  /*
   * Function ircomm_ttp_connect_response (self, skb)
   *
   *    
   *
   */
  int ircomm_ttp_connect_response(struct ircomm_cb *self, struct sk_buff *skb)
  {
  	int ret;
  
  	IRDA_DEBUG(4, __FUNCTION__"()\n");
  	
  	ret = irttp_connect_response(self->tsap, TTP_SAR_DISABLE, skb);
  
  	return ret;
  }
  
  /*
   * Function ircomm_ttp_data_request (self, userdata)
   *
   *    Send IrCOMM data to IrTTP layer. Currently we do not try to combine 
   *    control data with pure data, so they will be sent as separate frames. 
   *    Should not be a big problem though, since control frames are rare. But
   *    some of them are sent after connection establishment, so this can 
   *    increase the latency a bit.
   */
  int ircomm_ttp_data_request(struct ircomm_cb *self, struct sk_buff *skb, 
  			    int clen)
  {
  	int ret;
  
  	ASSERT(skb != NULL, return -1;);
  
  	IRDA_DEBUG(2, __FUNCTION__"(), clen=%d\n", clen);
  
  	/* 
  	 * Insert clen field, currently we either send data only, or control
  	 * only frames, to make things easier and avoid queueing
  	 */
  	ASSERT(skb_headroom(skb) >= IRCOMM_HEADER_SIZE, return -1;);
  	skb_push(skb, IRCOMM_HEADER_SIZE);
  
  	skb->data[0] = clen;
  
  	ret = irttp_data_request(self->tsap, skb);
  	if (ret) {
  		ERROR(__FUNCTION__ "(), failed\n");
  		dev_kfree_skb(skb);
  	}
  
  	return ret;
  }
  
  /*
   * Function ircomm_ttp_data_indication (instance, sap, skb)
   *
   *    Incoming data
   *
   */
  int ircomm_ttp_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_TTP_DATA_INDICATION, skb, NULL);
  
  	return 0;
  }
  
  void ircomm_ttp_connect_confirm(void *instance, void *sap,
  				struct qos_info *qos, 
  				__u32 max_sdu_size, 
  				__u8 max_header_size,
  				struct sk_buff *skb)
  {
  	struct ircomm_cb *self = (struct ircomm_cb *) instance;
  	struct ircomm_info info;
  
  	IRDA_DEBUG(4, __FUNCTION__"()\n");
  
  	ASSERT(self != NULL, return;);
  	ASSERT(self->magic == IRCOMM_MAGIC, return;);
  	ASSERT(skb != NULL, return;);
  	ASSERT(qos != NULL, return;);
  
  	if (max_sdu_size != TTP_SAR_DISABLE) {
  		ERROR(__FUNCTION__ "(), SAR not allowed for IrCOMM!\n");
  		dev_kfree_skb(skb);
  		return;
  	}
  
  	info.max_data_size = irttp_get_max_seg_size(self->tsap)
  		- IRCOMM_HEADER_SIZE;
  	info.max_header_size = max_header_size + IRCOMM_HEADER_SIZE;
  	info.qos = qos;
  
  	ircomm_do_event(self, IRCOMM_TTP_CONNECT_CONFIRM, skb, &info);
  }
  
  /*
   * Function ircomm_ttp_connect_indication (instance, sap, qos, max_sdu_size,
   *                                         max_header_size, skb)
   *
   *    
   *
   */
  void ircomm_ttp_connect_indication(void *instance, void *sap,
  				   struct qos_info *qos,
  				   __u32 max_sdu_size,
  				   __u8 max_header_size,
  				   struct sk_buff *skb)
  {
  	struct ircomm_cb *self = (struct ircomm_cb *)instance;
  	struct ircomm_info info;
  
  	IRDA_DEBUG(4, __FUNCTION__"()\n");
  
  	ASSERT(self != NULL, return;);
  	ASSERT(self->magic == IRCOMM_MAGIC, return;);
  	ASSERT(skb != NULL, return;);
  	ASSERT(qos != NULL, return;);
  
  	if (max_sdu_size != TTP_SAR_DISABLE) {
  		ERROR(__FUNCTION__ "(), SAR not allowed for IrCOMM!\n");
  		dev_kfree_skb(skb);
  		return;
  	}
  
  	info.max_data_size = irttp_get_max_seg_size(self->tsap)
  		- IRCOMM_HEADER_SIZE;
  	info.max_header_size = max_header_size + IRCOMM_HEADER_SIZE;
  	info.qos = qos;
  
  	ircomm_do_event(self, IRCOMM_TTP_CONNECT_INDICATION, skb, &info);
  }
  
  /*
   * Function ircomm_ttp_disconnect_request (self, userdata, info)
   *
   *    
   *
   */
  int ircomm_ttp_disconnect_request(struct ircomm_cb *self, 
  				  struct sk_buff *userdata, 
  				  struct ircomm_info *info)
  {
  	int ret;
  
  	ret = irttp_disconnect_request(self->tsap, userdata, P_NORMAL);
  
  	return ret;
  }
  
  /*
   * Function ircomm_ttp_disconnect_indication (instance, sap, reason, skb)
   *
   *    
   *
   */
  void ircomm_ttp_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(2, __FUNCTION__"()\n");
  
  	ASSERT(self != NULL, return;);
  	ASSERT(self->magic == IRCOMM_MAGIC, return;);
  
  	info.reason = reason;
  
  	ircomm_do_event(self, IRCOMM_TTP_DISCONNECT_INDICATION, skb, &info);
  }
  
  /*
   * Function ircomm_ttp_flow_indication (instance, sap, cmd)
   *
   *    Layer below is telling us to start or stop the flow of data
   *
   */
  void ircomm_ttp_flow_indication(void *instance, void *sap, LOCAL_FLOW cmd)
  {
  	struct ircomm_cb *self = (struct ircomm_cb *) instance;
  
  	IRDA_DEBUG(4, __FUNCTION__ "()\n");
  
  	ASSERT(self != NULL, return;);
  	ASSERT(self->magic == IRCOMM_MAGIC, return;);
  	
  	if (self->notify.flow_indication)
  		self->notify.flow_indication(self->notify.instance, self, cmd);
  }
  
  
  