ircomm_core.c
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上传日期:2013-02-24
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- /*********************************************************************
- *
- * Filename: ircomm_core.c
- * Version: 1.0
- * Description: IrCOMM service interface
- * Status: Experimental.
- * Author: Dag Brattli <dagb@cs.uit.no>
- * Created at: Sun Jun 6 20:37:34 1999
- * Modified at: Tue Dec 21 13:26:41 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/config.h>
- #include <linux/module.h>
- #include <linux/sched.h>
- #include <linux/proc_fs.h>
- #include <linux/init.h>
- #include <net/irda/irda.h>
- #include <net/irda/irmod.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_event.h>
- #include <net/irda/ircomm_lmp.h>
- #include <net/irda/ircomm_ttp.h>
- #include <net/irda/ircomm_param.h>
- #include <net/irda/ircomm_core.h>
- static int __ircomm_close(struct ircomm_cb *self);
- static void ircomm_control_indication(struct ircomm_cb *self,
- struct sk_buff *skb, int clen);
- #ifdef CONFIG_PROC_FS
- static int ircomm_proc_read(char *buf, char **start, off_t offset, int len);
- extern struct proc_dir_entry *proc_irda;
- #endif /* CONFIG_PROC_FS */
- hashbin_t *ircomm = NULL;
- int __init ircomm_init(void)
- {
- ircomm = hashbin_new(HB_LOCAL);
- if (ircomm == NULL) {
- ERROR(__FUNCTION__ "(), can't allocate hashbin!n");
- return -ENOMEM;
- }
-
- #ifdef CONFIG_PROC_FS
- create_proc_info_entry("ircomm", 0, proc_irda, ircomm_proc_read);
- #endif /* CONFIG_PROC_FS */
-
- MESSAGE("IrCOMM protocol (Dag Brattli)n");
-
- return 0;
- }
- #ifdef MODULE
- void ircomm_cleanup(void)
- {
- IRDA_DEBUG(2, __FUNCTION__ "()n");
- hashbin_delete(ircomm, (FREE_FUNC) __ircomm_close);
- #ifdef CONFIG_PROC_FS
- remove_proc_entry("ircomm", proc_irda);
- #endif /* CONFIG_PROC_FS */
- }
- #endif /* MODULE */
- /*
- * Function ircomm_open (client_notify)
- *
- * Start a new IrCOMM instance
- *
- */
- struct ircomm_cb *ircomm_open(notify_t *notify, __u8 service_type, int line)
- {
- struct ircomm_cb *self = NULL;
- int ret;
- IRDA_DEBUG(2, __FUNCTION__ "(), service_type=0x%02xn",
- service_type);
- ASSERT(ircomm != NULL, return NULL;);
- self = kmalloc(sizeof(struct ircomm_cb), GFP_ATOMIC);
- if (self == NULL)
- return NULL;
- memset(self, 0, sizeof(struct ircomm_cb));
- self->notify = *notify;
- self->magic = IRCOMM_MAGIC;
- /* Check if we should use IrLMP or IrTTP */
- if (service_type & IRCOMM_3_WIRE_RAW) {
- self->flow_status = FLOW_START;
- ret = ircomm_open_lsap(self);
- } else
- ret = ircomm_open_tsap(self);
- if (ret < 0)
- return NULL;
- self->service_type = service_type;
- self->line = line;
- hashbin_insert(ircomm, (irda_queue_t *) self, line, NULL);
- ircomm_next_state(self, IRCOMM_IDLE);
- return self;
- }
- /*
- * Function ircomm_close_instance (self)
- *
- * Remove IrCOMM instance
- *
- */
- static int __ircomm_close(struct ircomm_cb *self)
- {
- IRDA_DEBUG(2, __FUNCTION__"()n");
- /* Disconnect link if any */
- ircomm_do_event(self, IRCOMM_DISCONNECT_REQUEST, NULL, NULL);
- /* Remove TSAP */
- if (self->tsap) {
- irttp_close_tsap(self->tsap);
- self->tsap = NULL;
- }
- /* Remove LSAP */
- if (self->lsap) {
- irlmp_close_lsap(self->lsap);
- self->lsap = NULL;
- }
- self->magic = 0;
- kfree(self);
- return 0;
- }
- /*
- * Function ircomm_close (self)
- *
- * Closes and removes the specified IrCOMM instance
- *
- */
- int ircomm_close(struct ircomm_cb *self)
- {
- struct ircomm_cb *entry;
- ASSERT(self != NULL, return -EIO;);
- ASSERT(self->magic == IRCOMM_MAGIC, return -EIO;);
- IRDA_DEBUG(0, __FUNCTION__ "()n");
- entry = hashbin_remove(ircomm, self->line, NULL);
- ASSERT(entry == self, return -1;);
-
- return __ircomm_close(self);
- }
- /*
- * Function ircomm_connect_request (self, service_type)
- *
- * Impl. of this function is differ from one of the reference. This
- * function does discovery as well as sending connect request
- *
- */
- int ircomm_connect_request(struct ircomm_cb *self, __u8 dlsap_sel,
- __u32 saddr, __u32 daddr, struct sk_buff *skb,
- __u8 service_type)
- {
- struct ircomm_info info;
- int ret;
- IRDA_DEBUG(2 , __FUNCTION__"()n");
- ASSERT(self != NULL, return -1;);
- ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
- self->service_type= service_type;
- info.dlsap_sel = dlsap_sel;
- info.saddr = saddr;
- info.daddr = daddr;
- ret = ircomm_do_event(self, IRCOMM_CONNECT_REQUEST, skb, &info);
- return ret;
- }
- /*
- * Function ircomm_connect_indication (self, qos, skb)
- *
- * Notify user layer about the incoming connection
- *
- */
- void ircomm_connect_indication(struct ircomm_cb *self, struct sk_buff *skb,
- struct ircomm_info *info)
- {
- int clen = 0;
-
- IRDA_DEBUG(2, __FUNCTION__ "()n");
- /* Check if the packet contains data on the control channel */
- if (skb->len > 0)
- clen = skb->data[0];
-
- /*
- * If there are any data hiding in the control channel, we must
- * deliver it first. The side effect is that the control channel
- * will be removed from the skb
- */
- if (self->notify.connect_indication)
- self->notify.connect_indication(self->notify.instance, self,
- info->qos, info->max_data_size,
- info->max_header_size, skb);
- else {
- IRDA_DEBUG(0, __FUNCTION__ "(), missing handlern");
- dev_kfree_skb(skb);
- }
- }
- /*
- * Function ircomm_connect_response (self, userdata, max_sdu_size)
- *
- * User accepts connection
- *
- */
- int ircomm_connect_response(struct ircomm_cb *self, struct sk_buff *userdata)
- {
- int ret;
- ASSERT(self != NULL, return -1;);
- ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
- IRDA_DEBUG(4, __FUNCTION__ "()n");
- ret = ircomm_do_event(self, IRCOMM_CONNECT_RESPONSE, userdata, NULL);
- return ret;
- }
- /*
- * Function connect_confirm (self, skb)
- *
- * Notify user layer that the link is now connected
- *
- */
- void ircomm_connect_confirm(struct ircomm_cb *self, struct sk_buff *skb,
- struct ircomm_info *info)
- {
- IRDA_DEBUG(4, __FUNCTION__"()n");
- if (self->notify.connect_confirm )
- self->notify.connect_confirm(self->notify.instance,
- self, info->qos,
- info->max_data_size,
- info->max_header_size, skb);
- else {
- IRDA_DEBUG(0, __FUNCTION__ "(), missing handlern");
- dev_kfree_skb(skb);
- }
- }
- /*
- * Function ircomm_data_request (self, userdata)
- *
- * Send IrCOMM data to peer device
- *
- */
- int ircomm_data_request(struct ircomm_cb *self, struct sk_buff *skb)
- {
- int ret;
- IRDA_DEBUG(4, __FUNCTION__"()n");
- ASSERT(self != NULL, return -EFAULT;);
- ASSERT(self->magic == IRCOMM_MAGIC, return -EFAULT;);
- ASSERT(skb != NULL, return -EFAULT;);
-
- ret = ircomm_do_event(self, IRCOMM_DATA_REQUEST, skb, NULL);
- return ret;
- }
- /*
- * Function ircomm_data_indication (self, skb)
- *
- * Data arrived, so deliver it to user
- *
- */
- void ircomm_data_indication(struct ircomm_cb *self, struct sk_buff *skb)
- {
- IRDA_DEBUG(4, __FUNCTION__"()n");
- ASSERT(skb->len > 0, return;);
- if (self->notify.data_indication)
- self->notify.data_indication(self->notify.instance, self, skb);
- else {
- IRDA_DEBUG(0, __FUNCTION__ "(), missing handlern");
- dev_kfree_skb(skb);
- }
- }
- /*
- * Function ircomm_process_data (self, skb)
- *
- * Data arrived which may contain control channel data
- *
- */
- void ircomm_process_data(struct ircomm_cb *self, struct sk_buff *skb)
- {
- int clen;
- ASSERT(skb->len > 0, return;);
- clen = skb->data[0];
- /*
- * If there are any data hiding in the control channel, we must
- * deliver it first. The side effect is that the control channel
- * will be removed from the skb
- */
- if (clen > 0)
- ircomm_control_indication(self, skb, clen);
- /* Remove control channel from data channel */
- skb_pull(skb, clen+1);
- if (skb->len)
- ircomm_data_indication(self, skb);
- else {
- IRDA_DEBUG(4, __FUNCTION__
- "(), data was control info only!n");
- dev_kfree_skb(skb);
- }
- }
- /*
- * Function ircomm_control_request (self, params)
- *
- * Send control data to peer device
- *
- */
- int ircomm_control_request(struct ircomm_cb *self, struct sk_buff *skb)
- {
- int ret;
-
- IRDA_DEBUG(2, __FUNCTION__"()n");
- ASSERT(self != NULL, return -EFAULT;);
- ASSERT(self->magic == IRCOMM_MAGIC, return -EFAULT;);
- ASSERT(skb != NULL, return -EFAULT;);
-
- ret = ircomm_do_event(self, IRCOMM_CONTROL_REQUEST, skb, NULL);
- return ret;
- }
- /*
- * Function ircomm_control_indication (self, skb)
- *
- * Data has arrived on the control channel
- *
- */
- static void ircomm_control_indication(struct ircomm_cb *self,
- struct sk_buff *skb, int clen)
- {
- struct sk_buff *ctrl_skb;
- IRDA_DEBUG(2, __FUNCTION__"()n");
- ctrl_skb = skb_clone(skb, GFP_ATOMIC);
- if (!ctrl_skb)
- return;
- /* Remove data channel from control channel */
- skb_trim(ctrl_skb, clen+1);
-
- /* Use udata for delivering data on the control channel */
- if (self->notify.udata_indication)
- self->notify.udata_indication(self->notify.instance, self,
- ctrl_skb);
- else {
- IRDA_DEBUG(0, __FUNCTION__ "(), missing handlern");
- dev_kfree_skb(skb);
- }
- }
- /*
- * Function ircomm_disconnect_request (self, userdata, priority)
- *
- * User layer wants to disconnect the IrCOMM connection
- *
- */
- int ircomm_disconnect_request(struct ircomm_cb *self, struct sk_buff *userdata)
- {
- struct ircomm_info info;
- int ret;
- IRDA_DEBUG(2, __FUNCTION__"()n");
- ASSERT(self != NULL, return -1;);
- ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
- ret = ircomm_do_event(self, IRCOMM_DISCONNECT_REQUEST, userdata,
- &info);
- return ret;
- }
- /*
- * Function disconnect_indication (self, skb)
- *
- * Tell user that the link has been disconnected
- *
- */
- void ircomm_disconnect_indication(struct ircomm_cb *self, struct sk_buff *skb,
- struct ircomm_info *info)
- {
- IRDA_DEBUG(2, __FUNCTION__ "()n");
-
- ASSERT(info != NULL, return;);
- if (self->notify.disconnect_indication) {
- self->notify.disconnect_indication(self->notify.instance, self,
- info->reason, skb);
- } else {
- IRDA_DEBUG(0, __FUNCTION__ "(), missing handlern");
- dev_kfree_skb(skb);
- }
- }
- /*
- * Function ircomm_flow_request (self, flow)
- *
- *
- *
- */
- void ircomm_flow_request(struct ircomm_cb *self, LOCAL_FLOW flow)
- {
- IRDA_DEBUG(2, __FUNCTION__ "()n");
- ASSERT(self != NULL, return;);
- ASSERT(self->magic == IRCOMM_MAGIC, return;);
- if (self->service_type == IRCOMM_3_WIRE_RAW)
- return;
- irttp_flow_request(self->tsap, flow);
- }
- #ifdef CONFIG_PROC_FS
- /*
- * Function ircomm_proc_read (buf, start, offset, len, unused)
- *
- *
- *
- */
- int ircomm_proc_read(char *buf, char **start, off_t offset, int len)
- {
- struct ircomm_cb *self;
- unsigned long flags;
-
- save_flags(flags);
- cli();
- len = 0;
- self = (struct ircomm_cb *) hashbin_get_first(ircomm);
- while (self != NULL) {
- ASSERT(self->magic == IRCOMM_MAGIC, return len;);
- if(self->line < 0x10)
- len += sprintf(buf+len, "ircomm%d", self->line);
- else
- len += sprintf(buf+len, "irlpt%d", self->line - 0x10);
- len += sprintf(buf+len, " state: %s, ",
- ircomm_state[ self->state]);
- len += sprintf(buf+len,
- "slsap_sel: %#02x, dlsap_sel: %#02x, mode:",
- self->slsap_sel, self->dlsap_sel);
- if(self->service_type & IRCOMM_3_WIRE_RAW)
- len += sprintf(buf+len, " 3-wire-raw");
- if(self->service_type & IRCOMM_3_WIRE)
- len += sprintf(buf+len, " 3-wire");
- if(self->service_type & IRCOMM_9_WIRE)
- len += sprintf(buf+len, " 9-wire");
- if(self->service_type & IRCOMM_CENTRONICS)
- len += sprintf(buf+len, " Centronics");
- len += sprintf(buf+len, "n");
- self = (struct ircomm_cb *) hashbin_get_next(ircomm);
- }
- restore_flags(flags);
- return len;
- }
- #endif /* CONFIG_PROC_FS */
- #ifdef MODULE
- MODULE_AUTHOR("Dag Brattli <dag@brattli.net>");
- MODULE_DESCRIPTION("IrCOMM protocol");
- MODULE_LICENSE("GPL");
- int init_module(void)
- {
- return ircomm_init();
- }
-
- void cleanup_module(void)
- {
- ircomm_cleanup();
- }
- #endif /* MODULE */