net/irda/ircomm/ircomm_ttp.c - kernel/windcharger - Git at Google

 /*********************************************************************
  *
  * 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.
  *     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/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>

 static int ircomm_ttp_data_indication(void *instance, void *sap,
 				      struct sk_buff *skb);
 static 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);
 static 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);
 static void ircomm_ttp_flow_indication(void *instance, void *sap,
 				       LOCAL_FLOW cmd);
 static void ircomm_ttp_disconnect_indication(void *instance, void *sap,
 					     LM_REASON reason,
 					     struct sk_buff *skb);
 static int ircomm_ttp_data_request(struct ircomm_cb *self,
 				   struct sk_buff *skb,
 				   int clen);
 static int ircomm_ttp_connect_request(struct ircomm_cb *self,
 				      struct sk_buff *userdata,
 				      struct ircomm_info *info);
 static int ircomm_ttp_connect_response(struct ircomm_cb *self,
 				       struct sk_buff *userdata);
 static int ircomm_ttp_disconnect_request(struct ircomm_cb *self,
 					 struct sk_buff *userdata,
 					 struct ircomm_info *info);

 /*
  * Function ircomm_open_tsap (self)
  *
  *
  *
  */
 int ircomm_open_tsap(struct ircomm_cb *self)
 {
 	notify_t notify;

 	IRDA_DEBUG(4, "%s()\n", __func__ );

 	/* 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;
 	strlcpy(notify.name, "IrCOMM", sizeof(notify.name));

 	self->tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT,
 				     &notify);
 	if (!self->tsap) {
 		IRDA_DEBUG(0, "%sfailed to allocate tsap\n", __func__ );
 		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)
  *
  *
  *
  */
 static int ircomm_ttp_connect_request(struct ircomm_cb *self,
 				      struct sk_buff *userdata,
 				      struct ircomm_info *info)
 {
 	int ret = 0;

 	IRDA_DEBUG(4, "%s()\n", __func__ );

 	/* Don't forget to refcount it - should be NULL anyway */
 	if(userdata)
 		skb_get(userdata);

 	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)
  *
  *
  *
  */
 static int ircomm_ttp_connect_response(struct ircomm_cb *self,
 				       struct sk_buff *userdata)
 {
 	int ret;

 	IRDA_DEBUG(4, "%s()\n", __func__ );

 	/* Don't forget to refcount it - should be NULL anyway */
 	if(userdata)
 		skb_get(userdata);

 	ret = irttp_connect_response(self->tsap, TTP_SAR_DISABLE, userdata);

 	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.
  */
 static int ircomm_ttp_data_request(struct ircomm_cb *self,
 				   struct sk_buff *skb,
 				   int clen)
 {
 	int ret;

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

 	IRDA_DEBUG(2, "%s(), clen=%d\n", __func__ , clen);

 	/*
 	 * Insert clen field, currently we either send data only, or control
 	 * only frames, to make things easier and avoid queueing
 	 */
 	IRDA_ASSERT(skb_headroom(skb) >= IRCOMM_HEADER_SIZE, return -1;);

 	/* Don't forget to refcount it - see ircomm_tty_do_softint() */
 	skb_get(skb);

 	skb_push(skb, IRCOMM_HEADER_SIZE);

 	skb->data[0] = clen;

 	ret = irttp_data_request(self->tsap, skb);
 	if (ret) {
 		IRDA_ERROR("%s(), failed\n", __func__);
 		/* irttp_data_request already free the packet */
 	}

 	return ret;
 }

 /*
  * Function ircomm_ttp_data_indication (instance, sap, skb)
  *
  *    Incoming data
  *
  */
 static int ircomm_ttp_data_indication(void *instance, void *sap,
 				      struct sk_buff *skb)
 {
 	struct ircomm_cb *self = (struct ircomm_cb *) instance;

 	IRDA_DEBUG(4, "%s()\n", __func__ );

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

 	ircomm_do_event(self, IRCOMM_TTP_DATA_INDICATION, skb, NULL);

 	/* Drop reference count - see ircomm_tty_data_indication(). */
 	dev_kfree_skb(skb);

 	return 0;
 }

 static 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, "%s()\n", __func__ );

 	IRDA_ASSERT(self != NULL, return;);
 	IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
 	IRDA_ASSERT(skb != NULL, return;);
 	IRDA_ASSERT(qos != NULL, goto out;);

 	if (max_sdu_size != TTP_SAR_DISABLE) {
 		IRDA_ERROR("%s(), SAR not allowed for IrCOMM!\n",
 			   __func__);
 		goto out;
 	}

 	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);

 out:
 	/* Drop reference count - see ircomm_tty_connect_confirm(). */
 	dev_kfree_skb(skb);
 }

 /*
  * Function ircomm_ttp_connect_indication (instance, sap, qos, max_sdu_size,
  *                                         max_header_size, skb)
  *
  *
  *
  */
 static 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, "%s()\n", __func__ );

 	IRDA_ASSERT(self != NULL, return;);
 	IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
 	IRDA_ASSERT(skb != NULL, return;);
 	IRDA_ASSERT(qos != NULL, goto out;);

 	if (max_sdu_size != TTP_SAR_DISABLE) {
 		IRDA_ERROR("%s(), SAR not allowed for IrCOMM!\n",
 			   __func__);
 		goto out;
 	}

 	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);

 out:
 	/* Drop reference count - see ircomm_tty_connect_indication(). */
 	dev_kfree_skb(skb);
 }

 /*
  * Function ircomm_ttp_disconnect_request (self, userdata, info)
  *
  *
  *
  */
 static int ircomm_ttp_disconnect_request(struct ircomm_cb *self,
 					 struct sk_buff *userdata,
 					 struct ircomm_info *info)
 {
 	int ret;

 	/* Don't forget to refcount it - should be NULL anyway */
 	if(userdata)
 		skb_get(userdata);

 	ret = irttp_disconnect_request(self->tsap, userdata, P_NORMAL);

 	return ret;
 }

 /*
  * Function ircomm_ttp_disconnect_indication (instance, sap, reason, skb)
  *
  *
  *
  */
 static 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, "%s()\n", __func__ );

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

 	info.reason = reason;

 	ircomm_do_event(self, IRCOMM_TTP_DISCONNECT_INDICATION, skb, &info);

 	/* Drop reference count - see ircomm_tty_disconnect_indication(). */
 	if(skb)
 		dev_kfree_skb(skb);
 }

 /*
  * Function ircomm_ttp_flow_indication (instance, sap, cmd)
  *
  *    Layer below is telling us to start or stop the flow of data
  *
  */
 static void ircomm_ttp_flow_indication(void *instance, void *sap,
 				       LOCAL_FLOW cmd)
 {
 	struct ircomm_cb *self = (struct ircomm_cb *) instance;

 	IRDA_DEBUG(4, "%s()\n", __func__ );

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

 	if (self->notify.flow_indication)
 		self->notify.flow_indication(self->notify.instance, self, cmd);
 }
	/*********************************************************************
	*
	* 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.
	* 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/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>

	static int ircomm_ttp_data_indication(void instance, void sap,
	struct sk_buff *skb);
	static 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);
	static 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);
	static void ircomm_ttp_flow_indication(void instance, void sap,
	LOCAL_FLOW cmd);
	static void ircomm_ttp_disconnect_indication(void instance, void sap,
	LM_REASON reason,
	struct sk_buff *skb);
	static int ircomm_ttp_data_request(struct ircomm_cb *self,
	struct sk_buff *skb,
	int clen);
	static int ircomm_ttp_connect_request(struct ircomm_cb *self,
	struct sk_buff *userdata,
	struct ircomm_info *info);
	static int ircomm_ttp_connect_response(struct ircomm_cb *self,
	struct sk_buff *userdata);
	static int ircomm_ttp_disconnect_request(struct ircomm_cb *self,
	struct sk_buff *userdata,
	struct ircomm_info *info);

	/*
	* Function ircomm_open_tsap (self)
	*
	*
	*
	*/
	int ircomm_open_tsap(struct ircomm_cb *self)
	{
	notify_t notify;

	IRDA_DEBUG(4, "%s()\n", __func__ );

	/* 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;
	strlcpy(notify.name, "IrCOMM", sizeof(notify.name));

	self->tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT,
	&notify);
	if (!self->tsap) {
	IRDA_DEBUG(0, "%sfailed to allocate tsap\n", __func__ );
	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)
	*
	*
	*
	*/
	static int ircomm_ttp_connect_request(struct ircomm_cb *self,
	struct sk_buff *userdata,
	struct ircomm_info *info)
	{
	int ret = 0;

	IRDA_DEBUG(4, "%s()\n", __func__ );

	/* Don't forget to refcount it - should be NULL anyway */
	if(userdata)
	skb_get(userdata);

	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)
	*
	*
	*
	*/
	static int ircomm_ttp_connect_response(struct ircomm_cb *self,
	struct sk_buff *userdata)
	{
	int ret;

	IRDA_DEBUG(4, "%s()\n", __func__ );

	/* Don't forget to refcount it - should be NULL anyway */
	if(userdata)
	skb_get(userdata);

	ret = irttp_connect_response(self->tsap, TTP_SAR_DISABLE, userdata);

	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.
	*/
	static int ircomm_ttp_data_request(struct ircomm_cb *self,
	struct sk_buff *skb,
	int clen)
	{
	int ret;

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

	IRDA_DEBUG(2, "%s(), clen=%d\n", __func__ , clen);

	/*
	* Insert clen field, currently we either send data only, or control
	* only frames, to make things easier and avoid queueing
	*/
	IRDA_ASSERT(skb_headroom(skb) >= IRCOMM_HEADER_SIZE, return -1;);

	/* Don't forget to refcount it - see ircomm_tty_do_softint() */
	skb_get(skb);

	skb_push(skb, IRCOMM_HEADER_SIZE);

	skb->data[0] = clen;

	ret = irttp_data_request(self->tsap, skb);
	if (ret) {
	IRDA_ERROR("%s(), failed\n", __func__);
	/* irttp_data_request already free the packet */
	}

	return ret;
	}

	/*
	* Function ircomm_ttp_data_indication (instance, sap, skb)
	*
	* Incoming data
	*
	*/
	static int ircomm_ttp_data_indication(void instance, void sap,
	struct sk_buff *skb)
	{
	struct ircomm_cb self = (struct ircomm_cb ) instance;

	IRDA_DEBUG(4, "%s()\n", __func__ );

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

	ircomm_do_event(self, IRCOMM_TTP_DATA_INDICATION, skb, NULL);

	/* Drop reference count - see ircomm_tty_data_indication(). */
	dev_kfree_skb(skb);

	return 0;
	}

	static 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, "%s()\n", __func__ );

	IRDA_ASSERT(self != NULL, return;);
	IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
	IRDA_ASSERT(skb != NULL, return;);
	IRDA_ASSERT(qos != NULL, goto out;);

	if (max_sdu_size != TTP_SAR_DISABLE) {
	IRDA_ERROR("%s(), SAR not allowed for IrCOMM!\n",
	__func__);
	goto out;
	}

	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);

	out:
	/* Drop reference count - see ircomm_tty_connect_confirm(). */
	dev_kfree_skb(skb);
	}

	/*
	* Function ircomm_ttp_connect_indication (instance, sap, qos, max_sdu_size,
	* max_header_size, skb)
	*
	*
	*
	*/
	static 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, "%s()\n", __func__ );

	IRDA_ASSERT(self != NULL, return;);
	IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);
	IRDA_ASSERT(skb != NULL, return;);
	IRDA_ASSERT(qos != NULL, goto out;);

	if (max_sdu_size != TTP_SAR_DISABLE) {
	IRDA_ERROR("%s(), SAR not allowed for IrCOMM!\n",
	__func__);
	goto out;
	}

	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);

	out:
	/* Drop reference count - see ircomm_tty_connect_indication(). */
	dev_kfree_skb(skb);
	}

	/*
	* Function ircomm_ttp_disconnect_request (self, userdata, info)
	*
	*
	*
	*/
	static int ircomm_ttp_disconnect_request(struct ircomm_cb *self,
	struct sk_buff *userdata,
	struct ircomm_info *info)
	{
	int ret;

	/* Don't forget to refcount it - should be NULL anyway */
	if(userdata)
	skb_get(userdata);

	ret = irttp_disconnect_request(self->tsap, userdata, P_NORMAL);

	return ret;
	}

	/*
	* Function ircomm_ttp_disconnect_indication (instance, sap, reason, skb)
	*
	*
	*
	*/
	static 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, "%s()\n", __func__ );

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

	info.reason = reason;

	ircomm_do_event(self, IRCOMM_TTP_DISCONNECT_INDICATION, skb, &info);

	/* Drop reference count - see ircomm_tty_disconnect_indication(). */
	if(skb)
	dev_kfree_skb(skb);
	}

	/*
	* Function ircomm_ttp_flow_indication (instance, sap, cmd)
	*
	* Layer below is telling us to start or stop the flow of data
	*
	*/
	static void ircomm_ttp_flow_indication(void instance, void sap,
	LOCAL_FLOW cmd)
	{
	struct ircomm_cb self = (struct ircomm_cb ) instance;

	IRDA_DEBUG(4, "%s()\n", __func__ );

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

	if (self->notify.flow_indication)
	self->notify.flow_indication(self->notify.instance, self, cmd);
	}