isdn: remove isdn4linux

With all isdn4linux hardware drivers gone, this is only a wrapper around
CAPI to support old user space. However, from looking at the mailing
list, it seems that the last time anyone asked about it was in 2014,
when the upgrade from a linux-2.4 installation failed, and mISDN was
suggested as a replacement.

The largest public ISDN network (Deutsche Telekom) was supposed to be
shut down 2018, which must have drastically reduced the number of legacy
installations.

When we last discussed removing i4l in 2016, Karsten Keil suggested
revisiting this in 2018. I guess this is overdue.

Link: http://listserv.isdn4linux.de/pipermail/isdn4linux/2014-October/006165.html
Link: https://patchwork.kernel.org/patch/8484861/#17900371
Link: https://listserv.isdn4linux.de/pipermail/isdn4linux/2019-April/thread.html
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 99 deletions

diff --git a/drivers/isdn/i4l/isdn_concap.c b/drivers/isdn/i4l/isdn_concap.c
deleted file mode 100644
index 336523ec077c..000000000000
--- a/drivers/isdn/i4l/isdn_concap.c
+++ /dev/null
@@ -1,99 +0,0 @@
-/* $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 = {
-	.data_req = &isdn_concap_dl_data_req,
-	.connect_req = &isdn_concap_dl_connect_req,
-	.disconn_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;
-}