i386/linux/linux-2.3.21/drivers/isdn/isdn_concap.c

   1 /* $Id: isdn_concap.c,v 1.6 1999/08/22 20:26:01 calle 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 1.6  1999/08/22 20:26:01  calle
   9  * backported changes from kernel 2.3.14:
  10  * - several #include "config.h" gone, others come.
  11  * - "struct device" changed to "struct net_device" in 2.3.14, added a
  12  *   define in isdn_compat.h for older kernel versions.
  13  *
  14  * Revision 1.5  1998/10/30 18:44:48  he
  15  * pass return value from isdn_net_dial_req for dialmode change
  16  *
  17  * Revision 1.4  1998/10/30 17:55:24  he
  18  * dialmode for x25iface and multulink ppp
  19  *
  20  * Revision 1.3  1998/05/26 22:39:22  he
  21  * sync'ed with 2.1.102 where appropriate (CAPABILITY changes)
  22  * concap typo
  23  * cleared dev.tbusy in isdn_net BCONN status callback
  24  *
  25  * Revision 1.2  1998/01/31 22:49:21  keil
  26  * correct comments
  27  *
  28  * Revision 1.1  1998/01/31 22:27:57  keil
  29  * New files from Henner Eisen for X.25 support
  30  *
  31  */
  32
  33
  34 #include <linux/isdn.h>
  35 #include "isdn_x25iface.h"
  36 #include "isdn_net.h"
  37 #include <linux/concap.h>
  38 #include "isdn_concap.h"
  39
  40
  41 /* The following set of device service operations are for encapsulation
  42    protocols that require for reliable datalink semantics. That means:
  43
  44    - before any data is to be submitted the connection must explicitly
  45      be set up.
  46    - after the successful set up of the connection is signalled the
  47      connection is considered to be reliably up.
  48
  49    Auto-dialing ist not compatible with this requirements. Thus, auto-dialing
  50    is completely bypassed.
  51
  52    It might be possible to implement a (non standardized) datalink protocol
  53    that provides a reliable data link service while using some auto dialing
  54    mechanism. Such a protocol would need an auxiliary channel (i.e. user-user-
  55    signaling on the D-channel) while the B-channel is down.
  56    */
  57
  58
  59 int isdn_concap_dl_data_req(struct concap_proto *concap, struct sk_buff *skb)
  60 {
  61         int tmp;
  62         struct net_device *ndev = concap -> net_dev;
  63         isdn_net_local *lp = (isdn_net_local *) ndev->priv;
  64
  65         IX25DEBUG( "isdn_concap_dl_data_req: %s \n", concap->net_dev->name);
  66         lp->huptimer = 0;
  67         tmp=isdn_net_send_skb(ndev, lp, skb);
  68         IX25DEBUG( "isdn_concap_dl_data_req: %s : isdn_net_send_skb returned %d\n", concap -> net_dev -> name, tmp);
  69         return tmp;
  70 }
  71
  72
  73 int isdn_concap_dl_connect_req(struct concap_proto *concap)
  74 {
  75         struct net_device *ndev = concap -> net_dev;
  76         isdn_net_local *lp = (isdn_net_local *) ndev->priv;
  77         int ret;
  78         IX25DEBUG( "isdn_concap_dl_connect_req: %s \n", ndev -> name);
  79
  80         /* dial ... */
  81         ret = isdn_net_dial_req( lp );
  82         if ( ret ) IX25DEBUG("dialing failed\n");
  83         return ret;
  84 }
  85
  86 int isdn_concap_dl_disconn_req(struct concap_proto *concap)
  87 {
  88         IX25DEBUG( "isdn_concap_dl_disconn_req: %s \n", concap -> net_dev -> name);
  89
  90         isdn_net_hangup( concap -> net_dev );
  91         return 0;
  92 }
  93
  94 struct concap_device_ops isdn_concap_reliable_dl_dops = {
  95         &isdn_concap_dl_data_req,
  96         &isdn_concap_dl_connect_req,
  97         &isdn_concap_dl_disconn_req
  98 };
  99
 100 struct concap_device_ops isdn_concap_demand_dial_dops = {
 101         NULL, /* set this first entry to something like &isdn_net_start_xmit,
 102                  but the entry part of the current isdn_net_start_xmit must be
 103                  separated first. */
 104         /* no connection control for demand dial semantics */
 105         NULL,
 106         NULL,
 107 };
 108
 109 /* The following should better go into a dedicated source file such that
 110    this sourcefile does not need to include any protocol specific header
 111    files. For now:
 112    */
 113 struct concap_proto * isdn_concap_new( int encap )
 114 {
 115         switch ( encap ) {
 116         case ISDN_NET_ENCAP_X25IFACE:
 117                 return isdn_x25iface_proto_new();
 118         }
 119         return NULL;
 120 }