isdn: remove hisax driver

With the decline of ISDN, this seems to have become almost completely
obsolete, and even in the past years before that, almost all remaining
users appear to have used mISDN instead.

Birger Harzenetter noted that he is still using i4l/hisax to take
advantage of the 'divert' driver for call diversion, but otherwise uses
mISDN on the same hardware. This is a rare edge case as far as I
can tell, but we are still breaking an actively used work flow
(see https://xkcd.com/1172/).

We debated moving i4l/hisax to staging as an intermediate step, but as
he is not likely to change the setup, and that would just delay breaking
this use case.  The alternatives here are to stay on stable kernels
< 5.2, to create an external driver repository for isdn4linux, or to
add divert functionality to mISDN.

Cc: Birger Harzenetter <WIMPy@yeti.dk>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 46 deletions

diff --git a/drivers/isdn/hisax/hisax_isac.h b/drivers/isdn/hisax/hisax_isac.h
deleted file mode 100644
index d7301da97991..000000000000
--- a/drivers/isdn/hisax/hisax_isac.h
+++ /dev/null
@@ -1,46 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __HISAX_ISAC_H__
-#define __HISAX_ISAC_H__
-
-#include <linux/kernel.h>
-#include "fsm.h"
-#include "hisax_if.h"
-
-#define TIMER3_VALUE 7000
-#define MAX_DFRAME_LEN_L1 300
-
-#define ISAC_IOM1	0
-
-struct isac {
-	void *priv;
-
-	u_long flags;
-	struct hisax_d_if hisax_d_if;
-	struct FsmInst l1m;
-	struct FsmTimer timer;
-	u_char mocr;
-	u_char adf2;
-	int    type;
-
-	u_char rcvbuf[MAX_DFRAME_LEN_L1];
-	int rcvidx;
-
-	struct sk_buff *tx_skb;
-	int tx_cnt;
-
-	u_char (*read_isac)      (struct isac *, u_char);
-	void   (*write_isac)     (struct isac *, u_char, u_char);
-	void   (*read_isac_fifo) (struct isac *, u_char *, int);
-	void   (*write_isac_fifo)(struct isac *, u_char *, int);
-};
-
-void isac_init(struct isac *isac);
-void isac_d_l2l1(struct hisax_if *hisax_d_if, int pr, void *arg);
-
-void isac_setup(struct isac *isac);
-void isac_irq(struct isac *isac);
-
-void isacsx_setup(struct isac *isac);
-void isacsx_irq(struct isac *isac);
-
-#endif