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path: root/drivers/isdn/i4l/isdn_concap.c
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Diffstat (limited to 'drivers/isdn/i4l/isdn_concap.c')
-rw-r--r--drivers/isdn/i4l/isdn_concap.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/drivers/isdn/i4l/isdn_concap.c b/drivers/isdn/i4l/isdn_concap.c
new file mode 100644
index 000000000..91d57304d
--- /dev/null
+++ b/drivers/isdn/i4l/isdn_concap.c
@@ -0,0 +1,99 @@
+/* $Id: isdn_concap.c,v 1.1.2.2 2004/01/12 22:37:19 keil Exp $
+ *
+ * Linux ISDN subsystem, protocol encapsulation
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ */
+
+/* Stuff to support the concap_proto by isdn4linux. isdn4linux - specific
+ * stuff goes here. Stuff that depends only on the concap protocol goes to
+ * another -- protocol specific -- source file.
+ *
+ */
+
+
+#include <linux/isdn.h>
+#include "isdn_x25iface.h"
+#include "isdn_net.h"
+#include <linux/concap.h>
+#include "isdn_concap.h"
+
+
+/* The following set of device service operations are for encapsulation
+ protocols that require for reliable datalink semantics. That means:
+
+ - before any data is to be submitted the connection must explicitly
+ be set up.
+ - after the successful set up of the connection is signalled the
+ connection is considered to be reliably up.
+
+ Auto-dialing ist not compatible with this requirements. Thus, auto-dialing
+ is completely bypassed.
+
+ It might be possible to implement a (non standardized) datalink protocol
+ that provides a reliable data link service while using some auto dialing
+ mechanism. Such a protocol would need an auxiliary channel (i.e. user-user-
+ signaling on the D-channel) while the B-channel is down.
+*/
+
+
+static int isdn_concap_dl_data_req(struct concap_proto *concap, struct sk_buff *skb)
+{
+ struct net_device *ndev = concap->net_dev;
+ isdn_net_dev *nd = ((isdn_net_local *) netdev_priv(ndev))->netdev;
+ isdn_net_local *lp = isdn_net_get_locked_lp(nd);
+
+ IX25DEBUG("isdn_concap_dl_data_req: %s \n", concap->net_dev->name);
+ if (!lp) {
+ IX25DEBUG("isdn_concap_dl_data_req: %s : isdn_net_send_skb returned %d\n", concap->net_dev->name, 1);
+ return 1;
+ }
+ lp->huptimer = 0;
+ isdn_net_writebuf_skb(lp, skb);
+ spin_unlock_bh(&lp->xmit_lock);
+ IX25DEBUG("isdn_concap_dl_data_req: %s : isdn_net_send_skb returned %d\n", concap->net_dev->name, 0);
+ return 0;
+}
+
+
+static int isdn_concap_dl_connect_req(struct concap_proto *concap)
+{
+ struct net_device *ndev = concap->net_dev;
+ isdn_net_local *lp = netdev_priv(ndev);
+ int ret;
+ IX25DEBUG("isdn_concap_dl_connect_req: %s \n", ndev->name);
+
+ /* dial ... */
+ ret = isdn_net_dial_req(lp);
+ if (ret) IX25DEBUG("dialing failed\n");
+ return ret;
+}
+
+static int isdn_concap_dl_disconn_req(struct concap_proto *concap)
+{
+ IX25DEBUG("isdn_concap_dl_disconn_req: %s \n", concap->net_dev->name);
+
+ isdn_net_hangup(concap->net_dev);
+ return 0;
+}
+
+struct concap_device_ops isdn_concap_reliable_dl_dops = {
+ &isdn_concap_dl_data_req,
+ &isdn_concap_dl_connect_req,
+ &isdn_concap_dl_disconn_req
+};
+
+/* The following should better go into a dedicated source file such that
+ this sourcefile does not need to include any protocol specific header
+ files. For now:
+*/
+struct concap_proto *isdn_concap_new(int encap)
+{
+ switch (encap) {
+ case ISDN_NET_ENCAP_X25IFACE:
+ return isdn_x25iface_proto_new();
+ }
+ return NULL;
+}