Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / isdn / i4l / isdn_concap.c

diff --git a/kernel/drivers/isdn/i4l/isdn_concap.c b/kernel/drivers/isdn/i4l/isdn_concap.c
new file mode 100644 (file)
index 0000000..91d5730
--- /dev/null
+++ b/kernel/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;
+}