ircomm_ttp.c
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上传日期:2013-02-24
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- /*********************************************************************
- *
- * 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(¬ify);
- 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,
- ¬ify);
- if (!self->tsap) {
- IRDA_DEBUG(0, __FUNCTION__"failed to allocate tsapn");
- 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=%dn", 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__ "(), failedn");
- 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);
- }