isdn: capi: dead code removal

The staging isdn drivers are gone, and CONFIG_BT_CMTP is now
the only user. This means a lot of the code in the subsystem
has no remaining callers and can be removed.

Change the capi user space front-end to be part of kernelcapi,
and the combined module to only be compiled if BT_CMTP is
also enabled, then remove the interfaces that have no remaining
callers.

As the notifier list and the capi_drivers list have no callers
outside of kcapi.c, the implementation gets much simpler.

Some definitions from the include/linux/*.h headers are only
needed internally and are moved to kcapi.h.

Acked-by: David Miller <davem@davemloft.net>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20191210210455.3475361-2-arnd@arndb.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

9 files changed, 179 insertions, 912 deletions

diff --git a/drivers/isdn/Makefile b/drivers/isdn/Makefile
index 63baf27a2c79..d14334f4007e 100644
--- a/drivers/isdn/Makefile
+++ b/drivers/isdn/Makefile
@@ -3,6 +3,6 @@
 
 # Object files in subdirectories
 
-obj-$(CONFIG_ISDN_CAPI)			+= capi/
+obj-$(CONFIG_BT_CMTP)			+= capi/
 obj-$(CONFIG_MISDN)			+= mISDN/
 obj-$(CONFIG_ISDN)			+= hardware/
diff --git a/drivers/isdn/capi/Kconfig b/drivers/isdn/capi/Kconfig
index 573fea5500ce..cc408ad9aafb 100644
--- a/drivers/isdn/capi/Kconfig
+++ b/drivers/isdn/capi/Kconfig
@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0-only
-menuconfig ISDN_CAPI
-	tristate "CAPI 2.0 subsystem"
+config ISDN_CAPI
+	def_bool ISDN && BT
 	help
 	  This provides CAPI (the Common ISDN Application Programming
 	  Interface) Version 2.0, a standard making it easy for programs to
@@ -15,42 +15,18 @@ menuconfig ISDN_CAPI
 	  See CONFIG_BT_CMTP for the last remaining regular driver
 	  in the kernel that uses the CAPI subsystem.
 
-if ISDN_CAPI
-
 config CAPI_TRACE
-	bool "CAPI trace support"
-	default y
+	def_bool BT_CMTP
 	help
 	  If you say Y here, the kernelcapi driver can make verbose traces
 	  of CAPI messages. This feature can be enabled/disabled via IOCTL for
 	  every controller (default disabled).
-	  This will increase the size of the kernelcapi module by 20 KB.
-	  If unsure, say Y.
-
-config ISDN_CAPI_CAPI20
-	tristate "CAPI2.0 /dev/capi20 support"
-	help
-	  This option will provide the CAPI 2.0 interface to userspace
-	  applications via /dev/capi20. Applications should use the
-	  standardized libcapi20 to access this functionality.  You should say
-	  Y/M here.
 
 config ISDN_CAPI_MIDDLEWARE
-	bool "CAPI2.0 Middleware support"
-	depends on ISDN_CAPI_CAPI20 && TTY
+	def_bool BT_CMTP && TTY
 	help
 	  This option will enhance the capabilities of the /dev/capi20
 	  interface.  It will provide a means of moving a data connection,
 	  established via the usual /dev/capi20 interface to a special tty
 	  device.  If you want to use pppd with pppdcapiplugin to dial up to
 	  your ISP, say Y here.
-
-config ISDN_CAPI_CAPIDRV_VERBOSE
-	bool "Verbose reason code reporting"
-	depends on ISDN_CAPI_CAPIDRV
-	help
-	  If you say Y here, the capidrv interface will give verbose reasons
-	  for disconnecting. This will increase the size of the kernel by 7 KB.
-	  If unsure, say N.
-
-endif
diff --git a/drivers/isdn/capi/Makefile b/drivers/isdn/capi/Makefile
index d299f3e75f89..352217ebabd8 100644
--- a/drivers/isdn/capi/Makefile
+++ b/drivers/isdn/capi/Makefile
@@ -1,17 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
-# Makefile for the CAPI subsystem.
+# Makefile for the CAPI subsystem used by BT_CMTP
 
-# Ordering constraints: kernelcapi.o first
-
-# Each configuration option enables a list of files.
-
-obj-$(CONFIG_ISDN_CAPI)			+= kernelcapi.o
-obj-$(CONFIG_ISDN_CAPI_CAPI20)		+= capi.o 
-obj-$(CONFIG_ISDN_CAPI_CAPIDRV)		+= capidrv.o
-
-# Multipart objects.
-
-kernelcapi-y				:= kcapi.o capiutil.o capilib.o
-kernelcapi-$(CONFIG_PROC_FS)		+= kcapi_proc.o
-
-ccflags-y += -I$(srctree)/$(src)/../include -I$(srctree)/$(src)/../include/uapi
+obj-$(CONFIG_BT_CMTP)			+= kernelcapi.o
+kernelcapi-y				:= kcapi.o capiutil.o capi.o kcapi_proc.o
diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index 1675da34239b..85767f52fe3c 100644
--- a/drivers/isdn/capi/capi.c
+++ b/drivers/isdn/capi/capi.c
@@ -39,7 +39,9 @@
 #include <linux/isdn/capiutil.h>
 #include <linux/isdn/capicmd.h>
 
-MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
+#include "kcapi.h"
+
+MODULE_DESCRIPTION("CAPI4Linux: kernel CAPI layer and /dev/capi20 interface");
 MODULE_AUTHOR("Carsten Paeth");
 MODULE_LICENSE("GPL");
 
@@ -1412,15 +1414,22 @@ static int __init capi_init(void)
 {
 	const char *compileinfo;
 	int major_ret;
+	int ret;
+
+	ret = kcapi_init();
+	if (ret)
+		return ret;
 
 	major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
 	if (major_ret < 0) {
 		printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
+		kcapi_exit();
 		return major_ret;
 	}
 	capi_class = class_create(THIS_MODULE, "capi");
 	if (IS_ERR(capi_class)) {
 		unregister_chrdev(capi_major, "capi20");
+		kcapi_exit();
 		return PTR_ERR(capi_class);
 	}
 
@@ -1430,6 +1439,7 @@ static int __init capi_init(void)
 		device_destroy(capi_class, MKDEV(capi_major, 0));
 		class_destroy(capi_class);
 		unregister_chrdev(capi_major, "capi20");
+		kcapi_exit();
 		return -ENOMEM;
 	}
 
@@ -1455,6 +1465,8 @@ static void __exit capi_exit(void)
 	unregister_chrdev(capi_major, "capi20");
 
 	capinc_tty_exit();
+
+	kcapi_exit();
 }
 
 module_init(capi_init);
diff --git a/drivers/isdn/capi/capilib.c b/drivers/isdn/capi/capilib.c
deleted file mode 100644
index a39ad3796bba..000000000000
--- a/drivers/isdn/capi/capilib.c
+++ /dev/null
@@ -1,202 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-
-#include <linux/slab.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/isdn/capilli.h>
-
-#define DBG(format, arg...) do {					\
-		printk(KERN_DEBUG "%s: " format "\n" , __func__ , ## arg); \
-	} while (0)
-
-struct capilib_msgidqueue {
-	struct capilib_msgidqueue *next;
-	u16 msgid;
-};
-
-struct capilib_ncci {
-	struct list_head list;
-	u16 applid;
-	u32 ncci;
-	u32 winsize;
-	int   nmsg;
-	struct capilib_msgidqueue *msgidqueue;
-	struct capilib_msgidqueue *msgidlast;
-	struct capilib_msgidqueue *msgidfree;
-	struct capilib_msgidqueue msgidpool[CAPI_MAXDATAWINDOW];
-};
-
-// ---------------------------------------------------------------------------
-// NCCI Handling
-
-static inline void mq_init(struct capilib_ncci *np)
-{
-	u_int i;
-	np->msgidqueue = NULL;
-	np->msgidlast = NULL;
-	np->nmsg = 0;
-	memset(np->msgidpool, 0, sizeof(np->msgidpool));
-	np->msgidfree = &np->msgidpool[0];
-	for (i = 1; i < np->winsize; i++) {
-		np->msgidpool[i].next = np->msgidfree;
-		np->msgidfree = &np->msgidpool[i];
-	}
-}
-
-static inline int mq_enqueue(struct capilib_ncci *np, u16 msgid)
-{
-	struct capilib_msgidqueue *mq;
-	if ((mq = np->msgidfree) == NULL)
-		return 0;
-	np->msgidfree = mq->next;
-	mq->msgid = msgid;
-	mq->next = NULL;
-	if (np->msgidlast)
-		np->msgidlast->next = mq;
-	np->msgidlast = mq;
-	if (!np->msgidqueue)
-		np->msgidqueue = mq;
-	np->nmsg++;
-	return 1;
-}
-
-static inline int mq_dequeue(struct capilib_ncci *np, u16 msgid)
-{
-	struct capilib_msgidqueue **pp;
-	for (pp = &np->msgidqueue; *pp; pp = &(*pp)->next) {
-		if ((*pp)->msgid == msgid) {
-			struct capilib_msgidqueue *mq = *pp;
-			*pp = mq->next;
-			if (mq == np->msgidlast)
-				np->msgidlast = NULL;
-			mq->next = np->msgidfree;
-			np->msgidfree = mq;
-			np->nmsg--;
-			return 1;
-		}
-	}
-	return 0;
-}
-
-void capilib_new_ncci(struct list_head *head, u16 applid, u32 ncci, u32 winsize)
-{
-	struct capilib_ncci *np;
-
-	np = kmalloc(sizeof(*np), GFP_ATOMIC);
-	if (!np) {
-		printk(KERN_WARNING "capilib_new_ncci: no memory.\n");
-		return;
-	}
-	if (winsize > CAPI_MAXDATAWINDOW) {
-		printk(KERN_ERR "capi_new_ncci: winsize %d too big\n",
-		       winsize);
-		winsize = CAPI_MAXDATAWINDOW;
-	}
-	np->applid = applid;
-	np->ncci = ncci;
-	np->winsize = winsize;
-	mq_init(np);
-	list_add_tail(&np->list, head);
-	DBG("kcapi: appl %d ncci 0x%x up", applid, ncci);
-}
-
-EXPORT_SYMBOL(capilib_new_ncci);
-
-void capilib_free_ncci(struct list_head *head, u16 applid, u32 ncci)
-{
-	struct list_head *l;
-	struct capilib_ncci *np;
-
-	list_for_each(l, head) {
-		np = list_entry(l, struct capilib_ncci, list);
-		if (np->applid != applid)
-			continue;
-		if (np->ncci != ncci)
-			continue;
-		printk(KERN_INFO "kcapi: appl %d ncci 0x%x down\n", applid, ncci);
-		list_del(&np->list);
-		kfree(np);
-		return;
-	}
-	printk(KERN_ERR "capilib_free_ncci: ncci 0x%x not found\n", ncci);
-}
-
-EXPORT_SYMBOL(capilib_free_ncci);
-
-void capilib_release_appl(struct list_head *head, u16 applid)
-{
-	struct list_head *l, *n;
-	struct capilib_ncci *np;
-
-	list_for_each_safe(l, n, head) {
-		np = list_entry(l, struct capilib_ncci, list);
-		if (np->applid != applid)
-			continue;
-		printk(KERN_INFO "kcapi: appl %d ncci 0x%x forced down\n", applid, np->ncci);
-		list_del(&np->list);
-		kfree(np);
-	}
-}
-
-EXPORT_SYMBOL(capilib_release_appl);
-
-void capilib_release(struct list_head *head)
-{
-	struct list_head *l, *n;
-	struct capilib_ncci *np;
-
-	list_for_each_safe(l, n, head) {
-		np = list_entry(l, struct capilib_ncci, list);
-		printk(KERN_INFO "kcapi: appl %d ncci 0x%x forced down\n", np->applid, np->ncci);
-		list_del(&np->list);
-		kfree(np);
-	}
-}
-
-EXPORT_SYMBOL(capilib_release);
-
-u16 capilib_data_b3_req(struct list_head *head, u16 applid, u32 ncci, u16 msgid)
-{
-	struct list_head *l;
-	struct capilib_ncci *np;
-
-	list_for_each(l, head) {
-		np = list_entry(l, struct capilib_ncci, list);
-		if (np->applid != applid)
-			continue;
-		if (np->ncci != ncci)
-			continue;
-
-		if (mq_enqueue(np, msgid) == 0)
-			return CAPI_SENDQUEUEFULL;
-
-		return CAPI_NOERROR;
-	}
-	printk(KERN_ERR "capilib_data_b3_req: ncci 0x%x not found\n", ncci);
-	return CAPI_NOERROR;
-}
-
-EXPORT_SYMBOL(capilib_data_b3_req);
-
-void capilib_data_b3_conf(struct list_head *head, u16 applid, u32 ncci, u16 msgid)
-{
-	struct list_head *l;
-	struct capilib_ncci *np;
-
-	list_for_each(l, head) {
-		np = list_entry(l, struct capilib_ncci, list);
-		if (np->applid != applid)
-			continue;
-		if (np->ncci != ncci)
-			continue;
-
-		if (mq_dequeue(np, msgid) == 0) {
-			printk(KERN_ERR "kcapi: msgid %hu ncci 0x%x not on queue\n",
-			       msgid, ncci);
-		}
-		return;
-	}
-	printk(KERN_ERR "capilib_data_b3_conf: ncci 0x%x not found\n", ncci);
-}
-
-EXPORT_SYMBOL(capilib_data_b3_conf);
diff --git a/drivers/isdn/capi/capiutil.c b/drivers/isdn/capi/capiutil.c
index 9846d82eb097..f26bf3c66d7e 100644
--- a/drivers/isdn/capi/capiutil.c
+++ b/drivers/isdn/capi/capiutil.c
@@ -20,6 +20,8 @@
 #include <linux/isdn/capiutil.h>
 #include <linux/slab.h>
 
+#include "kcapi.h"
+
 /* from CAPI2.0 DDK AVM Berlin GmbH */
 
 typedef struct {
@@ -245,190 +247,6 @@ static void jumpcstruct(_cmsg *cmsg)
 		}
 	}
 }
-/*-------------------------------------------------------*/
-static void pars_2_message(_cmsg *cmsg)
-{
-
-	for (; TYP != _CEND; cmsg->p++) {
-		switch (TYP) {
-		case _CBYTE:
-			byteTLcpy(cmsg->m + cmsg->l, OFF);
-			cmsg->l++;
-			break;
-		case _CWORD:
-			wordTLcpy(cmsg->m + cmsg->l, OFF);
-			cmsg->l += 2;
-			break;
-		case _CDWORD:
-			dwordTLcpy(cmsg->m + cmsg->l, OFF);
-			cmsg->l += 4;
-			break;
-		case _CSTRUCT:
-			if (*(u8 **) OFF == NULL) {
-				*(cmsg->m + cmsg->l) = '\0';
-				cmsg->l++;
-			} else if (**(_cstruct *) OFF != 0xff) {
-				structTLcpy(cmsg->m + cmsg->l, *(_cstruct *) OFF, 1 + **(_cstruct *) OFF);
-				cmsg->l += 1 + **(_cstruct *) OFF;
-			} else {
-				_cstruct s = *(_cstruct *) OFF;
-				structTLcpy(cmsg->m + cmsg->l, s, 3 + *(u16 *) (s + 1));
-				cmsg->l += 3 + *(u16 *) (s + 1);
-			}
-			break;
-		case _CMSTRUCT:
-/*----- Metastruktur 0 -----*/
-			if (*(_cmstruct *) OFF == CAPI_DEFAULT) {
-				*(cmsg->m + cmsg->l) = '\0';
-				cmsg->l++;
-				jumpcstruct(cmsg);
-			}
-/*----- Metastruktur wird composed -----*/
-			else {
-				unsigned _l = cmsg->l;
-				unsigned _ls;
-				cmsg->l++;
-				cmsg->p++;
-				pars_2_message(cmsg);
-				_ls = cmsg->l - _l - 1;
-				if (_ls < 255)
-					(cmsg->m + _l)[0] = (u8) _ls;
-				else {
-					structTLcpyovl(cmsg->m + _l + 3, cmsg->m + _l + 1, _ls);
-					(cmsg->m + _l)[0] = 0xff;
-					wordTLcpy(cmsg->m + _l + 1, &_ls);
-				}
-			}
-			break;
-		}
-	}
-}
-
-/**
- * capi_cmsg2message() - assemble CAPI 2.0 message from _cmsg structure
- * @cmsg:	_cmsg structure
- * @msg:	buffer for assembled message
- *
- * Return value: 0 for success
- */
-
-unsigned capi_cmsg2message(_cmsg *cmsg, u8 *msg)
-{
-	cmsg->m = msg;
-	cmsg->l = 8;
-	cmsg->p = 0;
-	cmsg->par = capi_cmd2par(cmsg->Command, cmsg->Subcommand);
-	if (!cmsg->par)
-		return 1;	/* invalid command/subcommand */
-
-	pars_2_message(cmsg);
-
-	wordTLcpy(msg + 0, &cmsg->l);
-	byteTLcpy(cmsg->m + 4, &cmsg->Command);
-	byteTLcpy(cmsg->m + 5, &cmsg->Subcommand);
-	wordTLcpy(cmsg->m + 2, &cmsg->ApplId);
-	wordTLcpy(cmsg->m + 6, &cmsg->Messagenumber);
-
-	return 0;
-}
-
-/*-------------------------------------------------------*/
-static void message_2_pars(_cmsg *cmsg)
-{
-	for (; TYP != _CEND; cmsg->p++) {
-
-		switch (TYP) {
-		case _CBYTE:
-			byteTRcpy(cmsg->m + cmsg->l, OFF);
-			cmsg->l++;
-			break;
-		case _CWORD:
-			wordTRcpy(cmsg->m + cmsg->l, OFF);
-			cmsg->l += 2;
-			break;
-		case _CDWORD:
-			dwordTRcpy(cmsg->m + cmsg->l, OFF);
-			cmsg->l += 4;
-			break;
-		case _CSTRUCT:
-			*(u8 **) OFF = cmsg->m + cmsg->l;
-
-			if (cmsg->m[cmsg->l] != 0xff)
-				cmsg->l += 1 + cmsg->m[cmsg->l];
-			else
-				cmsg->l += 3 + *(u16 *) (cmsg->m + cmsg->l + 1);
-			break;
-		case _CMSTRUCT:
-/*----- Metastruktur 0 -----*/
-			if (cmsg->m[cmsg->l] == '\0') {
-				*(_cmstruct *) OFF = CAPI_DEFAULT;
-				cmsg->l++;
-				jumpcstruct(cmsg);
-			} else {
-				unsigned _l = cmsg->l;
-				*(_cmstruct *) OFF = CAPI_COMPOSE;
-				cmsg->l = (cmsg->m + _l)[0] == 255 ? cmsg->l + 3 : cmsg->l + 1;
-				cmsg->p++;
-				message_2_pars(cmsg);
-			}
-			break;
-		}
-	}
-}
-
-/**
- * capi_message2cmsg() - disassemble CAPI 2.0 message into _cmsg structure
- * @cmsg:	_cmsg structure
- * @msg:	buffer for assembled message
- *
- * Return value: 0 for success
- */
-
-unsigned capi_message2cmsg(_cmsg *cmsg, u8 *msg)
-{
-	memset(cmsg, 0, sizeof(_cmsg));
-	cmsg->m = msg;
-	cmsg->l = 8;
-	cmsg->p = 0;
-	byteTRcpy(cmsg->m + 4, &cmsg->Command);
-	byteTRcpy(cmsg->m + 5, &cmsg->Subcommand);
-	cmsg->par = capi_cmd2par(cmsg->Command, cmsg->Subcommand);
-	if (!cmsg->par)
-		return 1;	/* invalid command/subcommand */
-
-	message_2_pars(cmsg);
-
-	wordTRcpy(msg + 0, &cmsg->l);
-	wordTRcpy(cmsg->m + 2, &cmsg->ApplId);
-	wordTRcpy(cmsg->m + 6, &cmsg->Messagenumber);
-
-	return 0;
-}
-
-/**
- * capi_cmsg_header() - initialize header part of _cmsg structure
- * @cmsg:	_cmsg structure
- * @_ApplId:	ApplID field value
- * @_Command:	Command field value
- * @_Subcommand:	Subcommand field value
- * @_Messagenumber:	Message Number field value
- * @_Controller:	Controller/PLCI/NCCI field value
- *
- * Return value: 0 for success
- */
-
-unsigned capi_cmsg_header(_cmsg *cmsg, u16 _ApplId,
-			  u8 _Command, u8 _Subcommand,
-			  u16 _Messagenumber, u32 _Controller)
-{
-	memset(cmsg, 0, sizeof(_cmsg));
-	cmsg->ApplId = _ApplId;
-	cmsg->Command = _Command;
-	cmsg->Subcommand = _Subcommand;
-	cmsg->Messagenumber = _Messagenumber;
-	cmsg->adr.adrController = _Controller;
-	return 0;
-}
 
 /*-------------------------------------------------------*/
 
@@ -561,8 +379,6 @@ static char *pnames[] =
 	/*2f */ "Useruserdata"
 };
 
-
-
 #include <stdarg.h>
 
 /*-------------------------------------------------------*/
@@ -800,37 +616,6 @@ _cdebbuf *capi_message2str(u8 *msg)
 	return cdb;
 }
 
-/**
- * capi_cmsg2str() - format _cmsg structure for printing
- * @cmsg:	_cmsg structure
- *
- * Allocates a CAPI debug buffer and fills it with a printable representation
- * of the CAPI 2.0 message stored in @cmsg by a previous call to
- * capi_cmsg2message() or capi_message2cmsg().
- * Return value: allocated debug buffer, NULL on error
- * The returned buffer should be freed by a call to cdebbuf_free() after use.
- */
-
-_cdebbuf *capi_cmsg2str(_cmsg *cmsg)
-{
-	_cdebbuf *cdb;
-
-	if (!cmsg->m)
-		return NULL;	/* no message */
-	cdb = cdebbuf_alloc();
-	if (!cdb)
-		return NULL;
-	cmsg->l = 8;
-	cmsg->p = 0;
-	cdb = bufprint(cdb, "%s ID=%03d #0x%04x LEN=%04d\n",
-		       capi_cmd2str(cmsg->Command, cmsg->Subcommand),
-		       ((u16 *) cmsg->m)[1],
-		       ((u16 *) cmsg->m)[3],
-		       ((u16 *) cmsg->m)[0]);
-	cdb = protocol_message_2_pars(cdb, cmsg, 1);
-	return cdb;
-}
-
 int __init cdebug_init(void)
 {
 	g_cmsg = kmalloc(sizeof(_cmsg), GFP_KERNEL);
@@ -854,7 +639,7 @@ int __init cdebug_init(void)
 	return 0;
 }
 
-void __exit cdebug_exit(void)
+void cdebug_exit(void)
 {
 	if (g_debbuf)
 		kfree(g_debbuf->buf);
@@ -885,16 +670,8 @@ int __init cdebug_init(void)
 	return 0;
 }
 
-void __exit cdebug_exit(void)
+void cdebug_exit(void)
 {
 }
 
 #endif
-
-EXPORT_SYMBOL(cdebbuf_free);
-EXPORT_SYMBOL(capi_cmsg2message);
-EXPORT_SYMBOL(capi_message2cmsg);
-EXPORT_SYMBOL(capi_cmsg_header);
-EXPORT_SYMBOL(capi_cmd2str);
-EXPORT_SYMBOL(capi_cmsg2str);
-EXPORT_SYMBOL(capi_message2str);
diff --git a/drivers/isdn/capi/kcapi.c b/drivers/isdn/capi/kcapi.c
index a4ceb61c5b60..7168778fbbe1 100644
--- a/drivers/isdn/capi/kcapi.c
+++ b/drivers/isdn/capi/kcapi.c
@@ -10,8 +10,6 @@
  *
  */
 
-#define AVMB1_COMPAT
-
 #include "kcapi.h"
 #include <linux/module.h>
 #include <linux/mm.h>
@@ -31,18 +29,12 @@
 #include <linux/uaccess.h>
 #include <linux/isdn/capicmd.h>
 #include <linux/isdn/capiutil.h>
-#ifdef AVMB1_COMPAT
-#include <linux/b1lli.h>
-#endif
 #include <linux/mutex.h>
 #include <linux/rcupdate.h>
 
 static int showcapimsgs = 0;
 static struct workqueue_struct *kcapi_wq;
 
-MODULE_DESCRIPTION("CAPI4Linux: kernel CAPI layer");
-MODULE_AUTHOR("Carsten Paeth");
-MODULE_LICENSE("GPL");
 module_param(showcapimsgs, uint, 0);
 
 /* ------------------------------------------------------------- */
@@ -61,9 +53,6 @@ static char capi_manufakturer[64] = "AVM Berlin";
 
 #define NCCI2CTRL(ncci)    (((ncci) >> 24) & 0x7f)
 
-LIST_HEAD(capi_drivers);
-DEFINE_MUTEX(capi_drivers_lock);
-
 struct capi_ctr *capi_controller[CAPI_MAXCONTR];
 DEFINE_MUTEX(capi_controller_lock);
 
@@ -71,8 +60,6 @@ struct capi20_appl *capi_applications[CAPI_MAXAPPL];
 
 static int ncontrollers;
 
-static BLOCKING_NOTIFIER_HEAD(ctr_notifier_list);
-
 /* -------- controller ref counting -------------------------------------- */
 
 static inline struct capi_ctr *
@@ -200,8 +187,6 @@ static void notify_up(u32 contr)
 			if (ap)
 				register_appl(ctr, applid, &ap->rparam);
 		}
-
-		wake_up_interruptible_all(&ctr->state_wait_queue);
 	} else
 		printk(KERN_WARNING "%s: invalid contr %d\n", __func__, contr);
 
@@ -229,8 +214,6 @@ static void ctr_down(struct capi_ctr *ctr, int new_state)
 		if (ap)
 			capi_ctr_put(ctr);
 	}
-
-	wake_up_interruptible_all(&ctr->state_wait_queue);
 }
 
 static void notify_down(u32 contr)
@@ -251,36 +234,23 @@ static void notify_down(u32 contr)
 	mutex_unlock(&capi_controller_lock);
 }
 
-static int
-notify_handler(struct notifier_block *nb, unsigned long val, void *v)
+static void do_notify_work(struct work_struct *work)
 {
-	u32 contr = (long)v;
+	struct capictr_event *event =
+		container_of(work, struct capictr_event, work);
 
-	switch (val) {
+	switch (event->type) {
 	case CAPICTR_UP:
-		notify_up(contr);
+		notify_up(event->controller);
 		break;
 	case CAPICTR_DOWN:
-		notify_down(contr);
+		notify_down(event->controller);
 		break;
 	}
-	return NOTIFY_OK;
-}
 
-static void do_notify_work(struct work_struct *work)
-{
-	struct capictr_event *event =
-		container_of(work, struct capictr_event, work);
-
-	blocking_notifier_call_chain(&ctr_notifier_list, event->type,
-				     (void *)(long)event->controller);
 	kfree(event);
 }
 
-/*
- * The notifier will result in adding/deleteing of devices. Devices can
- * only removed in user process, not in bh.
- */
 static int notify_push(unsigned int event_type, u32 controller)
 {
 	struct capictr_event *event = kmalloc(sizeof(*event), GFP_ATOMIC);
@@ -296,18 +266,6 @@ static int notify_push(unsigned int event_type, u32 controller)
 	return 0;
 }
 
-int register_capictr_notifier(struct notifier_block *nb)
-{
-	return blocking_notifier_chain_register(&ctr_notifier_list, nb);
-}
-EXPORT_SYMBOL_GPL(register_capictr_notifier);
-
-int unregister_capictr_notifier(struct notifier_block *nb)
-{
-	return blocking_notifier_chain_unregister(&ctr_notifier_list, nb);
-}
-EXPORT_SYMBOL_GPL(unregister_capictr_notifier);
-
 /* -------- Receiver ------------------------------------------ */
 
 static void recv_handler(struct work_struct *work)
@@ -454,48 +412,6 @@ void capi_ctr_down(struct capi_ctr *ctr)
 
 EXPORT_SYMBOL(capi_ctr_down);
 
-/**
- * capi_ctr_suspend_output() - suspend controller
- * @ctr:	controller descriptor structure.
- *
- * Called by hardware driver to stop data flow.
- *
- * Note: The caller is responsible for synchronizing concurrent state changes
- * as well as invocations of capi_ctr_handle_message.
- */
-
-void capi_ctr_suspend_output(struct capi_ctr *ctr)
-{
-	if (!ctr->blocked) {
-		printk(KERN_DEBUG "kcapi: controller [%03d] suspend\n",
-		       ctr->cnr);
-		ctr->blocked = 1;
-	}
-}
-
-EXPORT_SYMBOL(capi_ctr_suspend_output);
-
-/**
- * capi_ctr_resume_output() - resume controller
- * @ctr:	controller descriptor structure.
- *
- * Called by hardware driver to resume data flow.
- *
- * Note: The caller is responsible for synchronizing concurrent state changes
- * as well as invocations of capi_ctr_handle_message.
- */
-
-void capi_ctr_resume_output(struct capi_ctr *ctr)
-{
-	if (ctr->blocked) {
-		printk(KERN_DEBUG "kcapi: controller [%03d] resumed\n",
-		       ctr->cnr);
-		ctr->blocked = 0;
-	}
-}
-
-EXPORT_SYMBOL(capi_ctr_resume_output);
-
 /* ------------------------------------------------------------- */
 
 /**
@@ -531,7 +447,6 @@ int attach_capi_ctr(struct capi_ctr *ctr)
 	ctr->state = CAPI_CTR_DETECTED;
 	ctr->blocked = 0;
 	ctr->traceflag = showcapimsgs;
-	init_waitqueue_head(&ctr->state_wait_queue);
 
 	sprintf(ctr->procfn, "capi/controllers/%d", ctr->cnr);
 	ctr->procent = proc_create_single_data(ctr->procfn, 0, NULL,
@@ -586,38 +501,6 @@ unlock_out:
 
 EXPORT_SYMBOL(detach_capi_ctr);
 
-/**
- * register_capi_driver() - register CAPI driver
- * @driver:	driver descriptor structure.
- *
- * Called by hardware driver to register itself with the CAPI subsystem.
- */
-
-void register_capi_driver(struct capi_driver *driver)
-{
-	mutex_lock(&capi_drivers_lock);
-	list_add_tail(&driver->list, &capi_drivers);
-	mutex_unlock(&capi_drivers_lock);
-}
-
-EXPORT_SYMBOL(register_capi_driver);
-
-/**
- * unregister_capi_driver() - unregister CAPI driver
- * @driver:	driver descriptor structure.
- *
- * Called by hardware driver to unregister itself from the CAPI subsystem.
- */
-
-void unregister_capi_driver(struct capi_driver *driver)
-{
-	mutex_lock(&capi_drivers_lock);
-	list_del(&driver->list);
-	mutex_unlock(&capi_drivers_lock);
-}
-
-EXPORT_SYMBOL(unregister_capi_driver);
-
 /* ------------------------------------------------------------- */
 /* -------- CAPI2.0 Interface ---------------------------------- */
 /* ------------------------------------------------------------- */
@@ -648,8 +531,6 @@ u16 capi20_isinstalled(void)
 	return ret;
 }
 
-EXPORT_SYMBOL(capi20_isinstalled);
-
 /**
  * capi20_register() - CAPI 2.0 operation CAPI_REGISTER
  * @ap:		CAPI application descriptor structure.
@@ -711,8 +592,6 @@ u16 capi20_register(struct capi20_appl *ap)
 	return CAPI_NOERROR;
 }
 
-EXPORT_SYMBOL(capi20_register);
-
 /**
  * capi20_release() - CAPI 2.0 operation CAPI_RELEASE
  * @ap:		CAPI application descriptor structure.
@@ -755,8 +634,6 @@ u16 capi20_release(struct capi20_appl *ap)
 	return CAPI_NOERROR;
 }
 
-EXPORT_SYMBOL(capi20_release);
-
 /**
  * capi20_put_message() - CAPI 2.0 operation CAPI_PUT_MESSAGE
  * @ap:		CAPI application descriptor structure.
@@ -834,8 +711,6 @@ u16 capi20_put_message(struct capi20_appl *ap, struct sk_buff *skb)
 	return ctr->send_message(ctr, skb);
 }
 
-EXPORT_SYMBOL(capi20_put_message);
-
 /**
  * capi20_get_manufacturer() - CAPI 2.0 operation CAPI_GET_MANUFACTURER
  * @contr:	controller number.
@@ -869,8 +744,6 @@ u16 capi20_get_manufacturer(u32 contr, u8 *buf)
 	return ret;
 }
 
-EXPORT_SYMBOL(capi20_get_manufacturer);
-
 /**
  * capi20_get_version() - CAPI 2.0 operation CAPI_GET_VERSION
  * @contr:	controller number.
@@ -904,8 +777,6 @@ u16 capi20_get_version(u32 contr, struct capi_version *verp)
 	return ret;
 }
 
-EXPORT_SYMBOL(capi20_get_version);
-
 /**
  * capi20_get_serial() - CAPI 2.0 operation CAPI_GET_SERIAL_NUMBER
  * @contr:	controller number.
@@ -939,8 +810,6 @@ u16 capi20_get_serial(u32 contr, u8 *serial)
 	return ret;
 }
 
-EXPORT_SYMBOL(capi20_get_serial);
-
 /**
  * capi20_get_profile() - CAPI 2.0 operation CAPI_GET_PROFILE
  * @contr:	controller number.
@@ -974,209 +843,6 @@ u16 capi20_get_profile(u32 contr, struct capi_profile *profp)
 	return ret;
 }
 
-EXPORT_SYMBOL(capi20_get_profile);
-
-/* Must be called with capi_controller_lock held. */
-static int wait_on_ctr_state(struct capi_ctr *ctr, unsigned int state)
-{
-	DEFINE_WAIT(wait);
-	int retval = 0;
-
-	ctr = capi_ctr_get(ctr);
-	if (!ctr)
-		return -ESRCH;
-
-	for (;;) {
-		prepare_to_wait(&ctr->state_wait_queue, &wait,
-				TASK_INTERRUPTIBLE);
-
-		if (ctr->state == state)
-			break;
-		if (ctr->state == CAPI_CTR_DETACHED) {
-			retval = -ESRCH;
-			break;
-		}
-		if (signal_pending(current)) {
-			retval = -EINTR;
-			break;
-		}
-
-		mutex_unlock(&capi_controller_lock);
-		schedule();
-		mutex_lock(&capi_controller_lock);
-	}
-	finish_wait(&ctr->state_wait_queue, &wait);
-
-	capi_ctr_put(ctr);
-
-	return retval;
-}
-
-#ifdef AVMB1_COMPAT
-static int old_capi_manufacturer(unsigned int cmd, void __user *data)
-{
-	avmb1_loadandconfigdef ldef;
-	avmb1_extcarddef cdef;
-	avmb1_resetdef rdef;
-	capicardparams cparams;
-	struct capi_ctr *ctr;
-	struct capi_driver *driver = NULL;
-	capiloaddata ldata;
-	struct list_head *l;
-	int retval;
-
-	switch (cmd) {
-	case AVMB1_ADDCARD:
-	case AVMB1_ADDCARD_WITH_TYPE:
-		if (cmd == AVMB1_ADDCARD) {
-			if ((retval = copy_from_user(&cdef, data,
-						     sizeof(avmb1_carddef))))
-				return -EFAULT;
-			cdef.cardtype = AVM_CARDTYPE_B1;
-			cdef.cardnr = 0;
-		} else {
-			if ((retval = copy_from_user(&cdef, data,
-						     sizeof(avmb1_extcarddef))))
-				return -EFAULT;
-		}
-		cparams.port = cdef.port;
-		cparams.irq = cdef.irq;
-		cparams.cardnr = cdef.cardnr;
-
-		mutex_lock(&capi_drivers_lock);
-
-		switch (cdef.cardtype) {
-		case AVM_CARDTYPE_B1:
-			list_for_each(l, &capi_drivers) {
-				driver = list_entry(l, struct capi_driver, list);
-				if (strcmp(driver->name, "b1isa") == 0)
-					break;
-			}
-			break;
-		case AVM_CARDTYPE_T1:
-			list_for_each(l, &capi_drivers) {
-				driver = list_entry(l, struct capi_driver, list);
-				if (strcmp(driver->name, "t1isa") == 0)
-					break;
-			}
-			break;
-		default:
-			driver = NULL;
-			break;
-		}
-		if (!driver) {
-			printk(KERN_ERR "kcapi: driver not loaded.\n");
-			retval = -EIO;
-		} else if (!driver->add_card) {
-			printk(KERN_ERR "kcapi: driver has no add card function.\n");
-			retval = -EIO;
-		} else
-			retval = driver->add_card(driver, &cparams);
-
-		mutex_unlock(&capi_drivers_lock);
-		return retval;
-
-	case AVMB1_LOAD:
-	case AVMB1_LOAD_AND_CONFIG:
-
-		if (cmd == AVMB1_LOAD) {
-			if (copy_from_user(&ldef, data,
-					   sizeof(avmb1_loaddef)))
-				return -EFAULT;
-			ldef.t4config.len = 0;
-			ldef.t4config.data = NULL;
-		} else {
-			if (copy_from_user(&ldef, data,
-					   sizeof(avmb1_loadandconfigdef)))
-				return -EFAULT;
-		}
-
-		mutex_lock(&capi_controller_lock);
-
-		ctr = get_capi_ctr_by_nr(ldef.contr);
-		if (!ctr) {
-			retval = -EINVAL;
-			goto load_unlock_out;
-		}
-
-		if (ctr->load_firmware == NULL) {
-			printk(KERN_DEBUG "kcapi: load: no load function\n");
-			retval = -ESRCH;
-			goto load_unlock_out;
-		}
-
-		if (ldef.t4file.len <= 0) {
-			printk(KERN_DEBUG "kcapi: load: invalid parameter: length of t4file is %d ?\n", ldef.t4file.len);
-			retval = -EINVAL;
-			goto load_unlock_out;
-		}
-		if (ldef.t4file.data == NULL) {
-			printk(KERN_DEBUG "kcapi: load: invalid parameter: dataptr is 0\n");
-			retval = -EINVAL;
-			goto load_unlock_out;
-		}
-
-		ldata.firmware.user = 1;
-		ldata.firmware.data = ldef.t4file.data;
-		ldata.firmware.len = ldef.t4file.len;
-		ldata.configuration.user = 1;
-		ldata.configuration.data = ldef.t4config.data;
-		ldata.configuration.len = ldef.t4config.len;
-
-		if (ctr->state != CAPI_CTR_DETECTED) {
-			printk(KERN_INFO "kcapi: load: contr=%d not in detect state\n", ldef.contr);
-			retval = -EBUSY;
-			goto load_unlock_out;
-		}
-		ctr->state = CAPI_CTR_LOADING;
-
-		retval = ctr->load_firmware(ctr, &ldata);
-		if (retval) {
-			ctr->state = CAPI_CTR_DETECTED;
-			goto load_unlock_out;
-		}
-
-		retval = wait_on_ctr_state(ctr, CAPI_CTR_RUNNING);
-
-	load_unlock_out:
-		mutex_unlock(&capi_controller_lock);
-		return retval;
-
-	case AVMB1_RESETCARD:
-		if (copy_from_user(&rdef, data, sizeof(avmb1_resetdef)))
-			return -EFAULT;
-
-		retval = 0;
-
-		mutex_lock(&capi_controller_lock);
-
-		ctr = get_capi_ctr_by_nr(rdef.contr);
-		if (!ctr) {
-			retval = -ESRCH;
-			goto reset_unlock_out;
-		}
-
-		if (ctr->state == CAPI_CTR_DETECTED)
-			goto reset_unlock_out;
-
-		if (ctr->reset_ctr == NULL) {
-			printk(KERN_DEBUG "kcapi: reset: no reset function\n");
-			retval = -ESRCH;
-			goto reset_unlock_out;
-		}
-
-		ctr->reset_ctr(ctr);
-
-		retval = wait_on_ctr_state(ctr, CAPI_CTR_DETECTED);
-
-	reset_unlock_out:
-		mutex_unlock(&capi_controller_lock);
-		return retval;
-	}
-	return -EINVAL;
-}
-#endif
-
 /**
  * capi20_manufacturer() - CAPI 2.0 operation CAPI_MANUFACTURER
  * @cmd:	command.
@@ -1192,14 +858,6 @@ int capi20_manufacturer(unsigned long cmd, void __user *data)
 	int retval;
 
 	switch (cmd) {
-#ifdef AVMB1_COMPAT
-	case AVMB1_LOAD:
-	case AVMB1_LOAD_AND_CONFIG:
-	case AVMB1_RESETCARD:
-	case AVMB1_GET_CARDINFO:
-	case AVMB1_REMOVECARD:
-		return old_capi_manufacturer(cmd, data);
-#endif
 	case KCAPI_CMD_TRACE:
 	{
 		kcapi_flagdef fdef;
@@ -1222,43 +880,6 @@ int capi20_manufacturer(unsigned long cmd, void __user *data)
 
 		return retval;
 	}
-	case KCAPI_CMD_ADDCARD:
-	{
-		struct list_head *l;
-		struct capi_driver *driver = NULL;
-		capicardparams cparams;
-		kcapi_carddef cdef;
-
-		if ((retval = copy_from_user(&cdef, data, sizeof(cdef))))
-			return -EFAULT;
-
-		cparams.port = cdef.port;
-		cparams.irq = cdef.irq;
-		cparams.membase = cdef.membase;
-		cparams.cardnr = cdef.cardnr;
-		cparams.cardtype = 0;
-		cdef.driver[sizeof(cdef.driver) - 1] = 0;
-
-		mutex_lock(&capi_drivers_lock);
-
-		list_for_each(l, &capi_drivers) {
-			driver = list_entry(l, struct capi_driver, list);
-			if (strcmp(driver->name, cdef.driver) == 0)
-				break;
-		}
-		if (driver == NULL) {
-			printk(KERN_ERR "kcapi: driver \"%s\" not loaded.\n",
-			       cdef.driver);
-			retval = -ESRCH;
-		} else if (!driver->add_card) {
-			printk(KERN_ERR "kcapi: driver \"%s\" has no add card function.\n", cdef.driver);
-			retval = -EIO;
-		} else
-			retval = driver->add_card(driver, &cparams);
-
-		mutex_unlock(&capi_drivers_lock);
-		return retval;
-	}
 
 	default:
 		printk(KERN_ERR "kcapi: manufacturer command %lu unknown.\n",
@@ -1269,8 +890,6 @@ int capi20_manufacturer(unsigned long cmd, void __user *data)
 	return -EINVAL;
 }
 
-EXPORT_SYMBOL(capi20_manufacturer);
-
 /* ------------------------------------------------------------- */
 /* -------- Init & Cleanup ------------------------------------- */
 /* ------------------------------------------------------------- */
@@ -1279,12 +898,7 @@ EXPORT_SYMBOL(capi20_manufacturer);
  * init / exit functions
  */
 
-static struct notifier_block capictr_nb = {
-	.notifier_call = notify_handler,
-	.priority = INT_MAX,
-};
-
-static int __init kcapi_init(void)
+int __init kcapi_init(void)
 {
 	int err;
 
@@ -1292,11 +906,8 @@ static int __init kcapi_init(void)
 	if (!kcapi_wq)
 		return -ENOMEM;
 
-	register_capictr_notifier(&capictr_nb);
-
 	err = cdebug_init();
 	if (err) {
-		unregister_capictr_notifier(&capictr_nb);
 		destroy_workqueue(kcapi_wq);
 		return err;
 	}
@@ -1305,14 +916,10 @@ static int __init kcapi_init(void)
 	return 0;
 }
 
-static void __exit kcapi_exit(void)
+void kcapi_exit(void)
 {
 	kcapi_proc_exit();
 
-	unregister_capictr_notifier(&capictr_nb);
 	cdebug_exit();
 	destroy_workqueue(kcapi_wq);
 }
-
-module_init(kcapi_init);
-module_exit(kcapi_exit);
diff --git a/drivers/isdn/capi/kcapi.h b/drivers/isdn/capi/kcapi.h
index 6d439f9a76b2..479623e1db2a 100644
--- a/drivers/isdn/capi/kcapi.h
+++ b/drivers/isdn/capi/kcapi.h
@@ -30,22 +30,153 @@ enum {
 	CAPI_CTR_RUNNING  = 3,
 };
 
-extern struct list_head capi_drivers;
-extern struct mutex capi_drivers_lock;
-
 extern struct capi_ctr *capi_controller[CAPI_MAXCONTR];
 extern struct mutex capi_controller_lock;
 
 extern struct capi20_appl *capi_applications[CAPI_MAXAPPL];
 
-#ifdef CONFIG_PROC_FS
-
 void kcapi_proc_init(void);
 void kcapi_proc_exit(void);
 
-#else
+struct capi20_appl {
+	u16 applid;
+	capi_register_params rparam;
+	void (*recv_message)(struct capi20_appl *ap, struct sk_buff *skb);
+	void *private;
 
-static inline void kcapi_proc_init(void) { };
-static inline void kcapi_proc_exit(void) { };
+	/* internal to kernelcapi.o */
+	unsigned long nrecvctlpkt;
+	unsigned long nrecvdatapkt;
+	unsigned long nsentctlpkt;
+	unsigned long nsentdatapkt;
+	struct mutex recv_mtx;
+	struct sk_buff_head recv_queue;
+	struct work_struct recv_work;
+	int release_in_progress;
+};
 
-#endif
+u16 capi20_isinstalled(void);
+u16 capi20_register(struct capi20_appl *ap);
+u16 capi20_release(struct capi20_appl *ap);
+u16 capi20_put_message(struct capi20_appl *ap, struct sk_buff *skb);
+u16 capi20_get_manufacturer(u32 contr, u8 buf[CAPI_MANUFACTURER_LEN]);
+u16 capi20_get_version(u32 contr, struct capi_version *verp);
+u16 capi20_get_serial(u32 contr, u8 serial[CAPI_SERIAL_LEN]);
+u16 capi20_get_profile(u32 contr, struct capi_profile *profp);
+int capi20_manufacturer(unsigned long cmd, void __user *data);
+
+#define CAPICTR_UP			0
+#define CAPICTR_DOWN			1
+
+int kcapi_init(void);
+void kcapi_exit(void);
+
+/*----- basic-type definitions -----*/
+
+typedef __u8 *_cstruct;
+
+typedef enum {
+	CAPI_COMPOSE,
+	CAPI_DEFAULT
+} _cmstruct;
+
+/*
+   The _cmsg structure contains all possible CAPI 2.0 parameter.
+   All parameters are stored here first. The function CAPI_CMSG_2_MESSAGE
+   assembles the parameter and builds CAPI2.0 conform messages.
+   CAPI_MESSAGE_2_CMSG disassembles CAPI 2.0 messages and stores the
+   parameter in the _cmsg structure
+ */
+
+typedef struct {
+	/* Header */
+	__u16 ApplId;
+	__u8 Command;
+	__u8 Subcommand;
+	__u16 Messagenumber;
+
+	/* Parameter */
+	union {
+		__u32 adrController;
+		__u32 adrPLCI;
+		__u32 adrNCCI;
+	} adr;
+
+	_cmstruct AdditionalInfo;
+	_cstruct B1configuration;
+	__u16 B1protocol;
+	_cstruct B2configuration;
+	__u16 B2protocol;
+	_cstruct B3configuration;
+	__u16 B3protocol;
+	_cstruct BC;
+	_cstruct BChannelinformation;
+	_cmstruct BProtocol;
+	_cstruct CalledPartyNumber;
+	_cstruct CalledPartySubaddress;
+	_cstruct CallingPartyNumber;
+	_cstruct CallingPartySubaddress;
+	__u32 CIPmask;
+	__u32 CIPmask2;
+	__u16 CIPValue;
+	__u32 Class;
+	_cstruct ConnectedNumber;
+	_cstruct ConnectedSubaddress;
+	__u32 Data;
+	__u16 DataHandle;
+	__u16 DataLength;
+	_cstruct FacilityConfirmationParameter;
+	_cstruct Facilitydataarray;
+	_cstruct FacilityIndicationParameter;
+	_cstruct FacilityRequestParameter;
+	__u16 FacilitySelector;
+	__u16 Flags;
+	__u32 Function;
+	_cstruct HLC;
+	__u16 Info;
+	_cstruct InfoElement;
+	__u32 InfoMask;
+	__u16 InfoNumber;
+	_cstruct Keypadfacility;
+	_cstruct LLC;
+	_cstruct ManuData;
+	__u32 ManuID;
+	_cstruct NCPI;
+	__u16 Reason;
+	__u16 Reason_B3;
+	__u16 Reject;
+	_cstruct Useruserdata;
+
+	/* intern */
+	unsigned l, p;
+	unsigned char *par;
+	__u8 *m;
+
+	/* buffer to construct message */
+	__u8 buf[180];
+
+} _cmsg;
+
+/*-----------------------------------------------------------------------*/
+
+/*
+ * Debugging / Tracing functions
+ */
+
+char *capi_cmd2str(__u8 cmd, __u8 subcmd);
+
+typedef struct {
+	u_char	*buf;
+	u_char	*p;
+	size_t	size;
+	size_t	pos;
+} _cdebbuf;
+
+#define	CDEBUG_SIZE	1024
+#define	CDEBUG_GSIZE	4096
+
+void cdebbuf_free(_cdebbuf *cdb);
+int cdebug_init(void);
+void cdebug_exit(void);
+
+_cdebbuf *capi_message2str(__u8 *msg);
diff --git a/drivers/isdn/capi/kcapi_proc.c b/drivers/isdn/capi/kcapi_proc.c
index c94bd12c0f7c..2bffbb8bf271 100644
--- a/drivers/isdn/capi/kcapi_proc.c
+++ b/drivers/isdn/capi/kcapi_proc.c
@@ -192,37 +192,15 @@ static const struct seq_operations seq_applstats_ops = {
 
 // ---------------------------------------------------------------------------
 
-static void *capi_driver_start(struct seq_file *seq, loff_t *pos)
-	__acquires(&capi_drivers_lock)
+/* /proc/capi/drivers is always empty */
+static ssize_t empty_read(struct file *file, char __user *buf,
+			  size_t size, loff_t *off)
 {
-	mutex_lock(&capi_drivers_lock);
-	return seq_list_start(&capi_drivers, *pos);
-}
-
-static void *capi_driver_next(struct seq_file *seq, void *v, loff_t *pos)
-{
-	return seq_list_next(v, &capi_drivers, pos);
-}
-
-static void capi_driver_stop(struct seq_file *seq, void *v)
-	__releases(&capi_drivers_lock)
-{
-	mutex_unlock(&capi_drivers_lock);
-}
-
-static int capi_driver_show(struct seq_file *seq, void *v)
-{
-	struct capi_driver *drv = list_entry(v, struct capi_driver, list);
-
-	seq_printf(seq, "%-32s %s\n", drv->name, drv->revision);
 	return 0;
 }
 
-static const struct seq_operations seq_capi_driver_ops = {
-	.start	= capi_driver_start,
-	.next	= capi_driver_next,
-	.stop	= capi_driver_stop,
-	.show	= capi_driver_show,
+static const struct file_operations empty_fops = {
+	.read	= empty_read,
 };
 
 // ---------------------------------------------------------------------------
@@ -236,7 +214,7 @@ kcapi_proc_init(void)
 	proc_create_seq("capi/contrstats",   0, NULL, &seq_contrstats_ops);
 	proc_create_seq("capi/applications", 0, NULL, &seq_applications_ops);
 	proc_create_seq("capi/applstats",    0, NULL, &seq_applstats_ops);
-	proc_create_seq("capi/driver",       0, NULL, &seq_capi_driver_ops);
+	proc_create("capi/driver",           0, NULL, &empty_fops);
 }
 
 void __exit