drivers/isdn/isdn_concap.c

   1 /* $Id: isdn_concap.c,v 1.5 1998/10/30 18:44:48 he Exp $
   2
   3  * Stuff to support the concap_proto by isdn4linux. isdn4linux - specific
   4  * stuff goes here. Stuff that depends only on the concap protocol goes to
   5  * another -- protocol specific -- source file.
   6  *
   7  * $Log: isdn_concap.c,v $
   8  * Revision 1.5  1998/10/30 18:44:48  he
   9  * pass return value from isdn_net_dial_req for dialmode change
  10  *
  11  * Revision 1.4  1998/10/30 17:55:24  he
  12  * dialmode for x25iface and multulink ppp
  13  *
  14  * Revision 1.3  1998/05/26 22:39:22  he
  15  * sync'ed with 2.1.102 where appropriate (CAPABILITY changes)
  16  * concap typo
  17  * cleared dev.tbusy in isdn_net BCONN status callback
  18  *
  19  * Revision 1.2  1998/01/31 22:49:21  keil
  20  * correct comments
  21  *
  22  * Revision 1.1  1998/01/31 22:27:57  keil
  23  * New files from Henner Eisen for X.25 support
  24  *
  25  */
  26
  27
  28 #include <linux/isdn.h>
  29 #include "isdn_x25iface.h"
  30 #include "isdn_net.h"
  31 #include <linux/concap.h>
  32 #include "isdn_concap.h"
  33
  34
  35 /* The following set of device service operations are for encapsulation
  36    protocols that require for reliable datalink semantics. That means:
  37
  38    - before any data is to be submitted the connection must explicitly
  39      be set up.
  40    - after the successful set up of the connection is signalled the
  41      connection is considered to be reliably up.
  42
  43    Auto-dialing ist not compatible with this requirements. Thus, auto-dialing
  44    is completely bypassed.
  45
  46    It might be possible to implement a (non standardized) datalink protocol
  47    that provides a reliable data link service while using some auto dialing
  48    mechanism. Such a protocol would need an auxiliary channel (i.e. user-user-
  49    signaling on the D-channel) while the B-channel is down.
  50    */
  51
  52
  53 int isdn_concap_dl_data_req(struct concap_proto *concap, struct sk_buff *skb)
  54 {
  55         int tmp;
  56         struct device *ndev = concap -> net_dev;
  57         isdn_net_local *lp = (isdn_net_local *) ndev->priv;
  58
  59         IX25DEBUG( "isdn_concap_dl_data_req: %s \n", concap->net_dev->name);
  60         lp->huptimer = 0;
  61         tmp=isdn_net_send_skb(ndev, lp, skb);
  62         IX25DEBUG( "isdn_concap_dl_data_req: %s : isdn_net_send_skb returned %d\n", concap -> net_dev -> name, tmp);
  63         return tmp;
  64 }
  65
  66
  67 int isdn_concap_dl_connect_req(struct concap_proto *concap)
  68 {
  69         struct device *ndev = concap -> net_dev;
  70         isdn_net_local *lp = (isdn_net_local *) ndev->priv;
  71         int ret;
  72         IX25DEBUG( "isdn_concap_dl_connect_req: %s \n", ndev -> name);
  73
  74         /* dial ... */
  75         ret = isdn_net_dial_req( lp );
  76         if ( ret ) IX25DEBUG("dialing failed\n");
  77         return ret;
  78 }
  79
  80 int isdn_concap_dl_disconn_req(struct concap_proto *concap)
  81 {
  82         IX25DEBUG( "isdn_concap_dl_disconn_req: %s \n", concap -> net_dev -> name);
  83
  84         isdn_net_hangup( concap -> net_dev );
  85         return 0;
  86 }
  87
  88 struct concap_device_ops isdn_concap_reliable_dl_dops = {
  89         &isdn_concap_dl_data_req,
  90         &isdn_concap_dl_connect_req,
  91         &isdn_concap_dl_disconn_req
  92 };
  93
  94 struct concap_device_ops isdn_concap_demand_dial_dops = {
  95         NULL, /* set this first entry to something like &isdn_net_start_xmit,
  96                  but the entry part of the current isdn_net_start_xmit must be
  97                  separated first. */
  98         /* no connection control for demand dial semantics */
  99         NULL,
 100         NULL,
 101 };
 102
 103 /* The following should better go into a dedicated source file such that
 104    this sourcefile does not need to include any protocol specific header
 105    files. For now:
 106    */
 107 struct concap_proto * isdn_concap_new( int encap )
 108 {
 109         switch ( encap ) {
 110         case ISDN_NET_ENCAP_X25IFACE:
 111                 return isdn_x25iface_proto_new();
 112         }
 113         return NULL;
 114 }