Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 677 insertions, 0 deletions

diff --git a/drivers/isdn/capi/capiutil.c b/drivers/isdn/capi/capiutil.c
new file mode 100644
index 000000000..d7ae42edc
--- /dev/null
+++ b/drivers/isdn/capi/capiutil.c
@@ -0,0 +1,677 @@
+/* $Id: capiutil.c,v 1.13.6.4 2001/09/23 22:24:33 kai Exp $
+ *
+ * CAPI 2.0 convert capi message to capi message struct
+ *
+ * From CAPI 2.0 Development Kit AVM 1995 (msg.c)
+ * Rewritten for Linux 1996 by Carsten Paeth <calle@calle.de>
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/stddef.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/isdn/capiutil.h>
+#include <linux/slab.h>
+
+#include "kcapi.h"
+
+/* from CAPI2.0 DDK AVM Berlin GmbH */
+
+typedef struct {
+	int typ;
+	size_t off;
+} _cdef;
+
+#define _CBYTE	       1
+#define _CWORD	       2
+#define _CDWORD        3
+#define _CSTRUCT       4
+#define _CMSTRUCT      5
+#define _CEND	       6
+
+static _cdef cdef[] =
+{
+	/*00 */
+	{_CEND},
+	/*01 */
+	{_CEND},
+	/*02 */
+	{_CEND},
+	/*03 */
+	{_CDWORD, offsetof(_cmsg, adr.adrController)},
+	/*04 */
+	{_CMSTRUCT, offsetof(_cmsg, AdditionalInfo)},
+	/*05 */
+	{_CSTRUCT, offsetof(_cmsg, B1configuration)},
+	/*06 */
+	{_CWORD, offsetof(_cmsg, B1protocol)},
+	/*07 */
+	{_CSTRUCT, offsetof(_cmsg, B2configuration)},
+	/*08 */
+	{_CWORD, offsetof(_cmsg, B2protocol)},
+	/*09 */
+	{_CSTRUCT, offsetof(_cmsg, B3configuration)},
+	/*0a */
+	{_CWORD, offsetof(_cmsg, B3protocol)},
+	/*0b */
+	{_CSTRUCT, offsetof(_cmsg, BC)},
+	/*0c */
+	{_CSTRUCT, offsetof(_cmsg, BChannelinformation)},
+	/*0d */
+	{_CMSTRUCT, offsetof(_cmsg, BProtocol)},
+	/*0e */
+	{_CSTRUCT, offsetof(_cmsg, CalledPartyNumber)},
+	/*0f */
+	{_CSTRUCT, offsetof(_cmsg, CalledPartySubaddress)},
+	/*10 */
+	{_CSTRUCT, offsetof(_cmsg, CallingPartyNumber)},
+	/*11 */
+	{_CSTRUCT, offsetof(_cmsg, CallingPartySubaddress)},
+	/*12 */
+	{_CDWORD, offsetof(_cmsg, CIPmask)},
+	/*13 */
+	{_CDWORD, offsetof(_cmsg, CIPmask2)},
+	/*14 */
+	{_CWORD, offsetof(_cmsg, CIPValue)},
+	/*15 */
+	{_CDWORD, offsetof(_cmsg, Class)},
+	/*16 */
+	{_CSTRUCT, offsetof(_cmsg, ConnectedNumber)},
+	/*17 */
+	{_CSTRUCT, offsetof(_cmsg, ConnectedSubaddress)},
+	/*18 */
+	{_CDWORD, offsetof(_cmsg, Data)},
+	/*19 */
+	{_CWORD, offsetof(_cmsg, DataHandle)},
+	/*1a */
+	{_CWORD, offsetof(_cmsg, DataLength)},
+	/*1b */
+	{_CSTRUCT, offsetof(_cmsg, FacilityConfirmationParameter)},
+	/*1c */
+	{_CSTRUCT, offsetof(_cmsg, Facilitydataarray)},
+	/*1d */
+	{_CSTRUCT, offsetof(_cmsg, FacilityIndicationParameter)},
+	/*1e */
+	{_CSTRUCT, offsetof(_cmsg, FacilityRequestParameter)},
+	/*1f */
+	{_CWORD, offsetof(_cmsg, FacilitySelector)},
+	/*20 */
+	{_CWORD, offsetof(_cmsg, Flags)},
+	/*21 */
+	{_CDWORD, offsetof(_cmsg, Function)},
+	/*22 */
+	{_CSTRUCT, offsetof(_cmsg, HLC)},
+	/*23 */
+	{_CWORD, offsetof(_cmsg, Info)},
+	/*24 */
+	{_CSTRUCT, offsetof(_cmsg, InfoElement)},
+	/*25 */
+	{_CDWORD, offsetof(_cmsg, InfoMask)},
+	/*26 */
+	{_CWORD, offsetof(_cmsg, InfoNumber)},
+	/*27 */
+	{_CSTRUCT, offsetof(_cmsg, Keypadfacility)},
+	/*28 */
+	{_CSTRUCT, offsetof(_cmsg, LLC)},
+	/*29 */
+	{_CSTRUCT, offsetof(_cmsg, ManuData)},
+	/*2a */
+	{_CDWORD, offsetof(_cmsg, ManuID)},
+	/*2b */
+	{_CSTRUCT, offsetof(_cmsg, NCPI)},
+	/*2c */
+	{_CWORD, offsetof(_cmsg, Reason)},
+	/*2d */
+	{_CWORD, offsetof(_cmsg, Reason_B3)},
+	/*2e */
+	{_CWORD, offsetof(_cmsg, Reject)},
+	/*2f */
+	{_CSTRUCT, offsetof(_cmsg, Useruserdata)}
+};
+
+static unsigned char *cpars[] =
+{
+	/* ALERT_REQ */ [0x01] = "\x03\x04\x0c\x27\x2f\x1c\x01\x01",
+	/* CONNECT_REQ */ [0x02] = "\x03\x14\x0e\x10\x0f\x11\x0d\x06\x08\x0a\x05\x07\x09\x01\x0b\x28\x22\x04\x0c\x27\x2f\x1c\x01\x01",
+	/* DISCONNECT_REQ */ [0x04] = "\x03\x04\x0c\x27\x2f\x1c\x01\x01",
+	/* LISTEN_REQ */ [0x05] = "\x03\x25\x12\x13\x10\x11\x01",
+	/* INFO_REQ */ [0x08] = "\x03\x0e\x04\x0c\x27\x2f\x1c\x01\x01",
+	/* FACILITY_REQ */ [0x09] = "\x03\x1f\x1e\x01",
+	/* SELECT_B_PROTOCOL_REQ */ [0x0a] = "\x03\x0d\x06\x08\x0a\x05\x07\x09\x01\x01",
+	/* CONNECT_B3_REQ */ [0x0b] = "\x03\x2b\x01",
+	/* DISCONNECT_B3_REQ */ [0x0d] = "\x03\x2b\x01",
+	/* DATA_B3_REQ */ [0x0f] = "\x03\x18\x1a\x19\x20\x01",
+	/* RESET_B3_REQ */ [0x10] = "\x03\x2b\x01",
+	/* ALERT_CONF */ [0x13] = "\x03\x23\x01",
+	/* CONNECT_CONF */ [0x14] = "\x03\x23\x01",
+	/* DISCONNECT_CONF */ [0x16] = "\x03\x23\x01",
+	/* LISTEN_CONF */ [0x17] = "\x03\x23\x01",
+	/* MANUFACTURER_REQ */ [0x18] = "\x03\x2a\x15\x21\x29\x01",
+	/* INFO_CONF */ [0x1a] = "\x03\x23\x01",
+	/* FACILITY_CONF */ [0x1b] = "\x03\x23\x1f\x1b\x01",
+	/* SELECT_B_PROTOCOL_CONF */ [0x1c] = "\x03\x23\x01",
+	/* CONNECT_B3_CONF */ [0x1d] = "\x03\x23\x01",
+	/* DISCONNECT_B3_CONF */ [0x1f] = "\x03\x23\x01",
+	/* DATA_B3_CONF */ [0x21] = "\x03\x19\x23\x01",
+	/* RESET_B3_CONF */ [0x22] = "\x03\x23\x01",
+	/* CONNECT_IND */ [0x26] = "\x03\x14\x0e\x10\x0f\x11\x0b\x28\x22\x04\x0c\x27\x2f\x1c\x01\x01",
+	/* CONNECT_ACTIVE_IND */ [0x27] = "\x03\x16\x17\x28\x01",
+	/* DISCONNECT_IND */ [0x28] = "\x03\x2c\x01",
+	/* MANUFACTURER_CONF */ [0x2a] = "\x03\x2a\x15\x21\x29\x01",
+	/* INFO_IND */ [0x2c] = "\x03\x26\x24\x01",
+	/* FACILITY_IND */ [0x2d] = "\x03\x1f\x1d\x01",
+	/* CONNECT_B3_IND */ [0x2f] = "\x03\x2b\x01",
+	/* CONNECT_B3_ACTIVE_IND */ [0x30] = "\x03\x2b\x01",
+	/* DISCONNECT_B3_IND */ [0x31] = "\x03\x2d\x2b\x01",
+	/* DATA_B3_IND */ [0x33] = "\x03\x18\x1a\x19\x20\x01",
+	/* RESET_B3_IND */ [0x34] = "\x03\x2b\x01",
+	/* CONNECT_B3_T90_ACTIVE_IND */ [0x35] = "\x03\x2b\x01",
+	/* CONNECT_RESP */ [0x38] = "\x03\x2e\x0d\x06\x08\x0a\x05\x07\x09\x01\x16\x17\x28\x04\x0c\x27\x2f\x1c\x01\x01",
+	/* CONNECT_ACTIVE_RESP */ [0x39] = "\x03\x01",
+	/* DISCONNECT_RESP */ [0x3a] = "\x03\x01",
+	/* MANUFACTURER_IND */ [0x3c] = "\x03\x2a\x15\x21\x29\x01",
+	/* INFO_RESP */ [0x3e] = "\x03\x01",
+	/* FACILITY_RESP */ [0x3f] = "\x03\x1f\x01",
+	/* CONNECT_B3_RESP */ [0x41] = "\x03\x2e\x2b\x01",
+	/* CONNECT_B3_ACTIVE_RESP */ [0x42] = "\x03\x01",
+	/* DISCONNECT_B3_RESP */ [0x43] = "\x03\x01",
+	/* DATA_B3_RESP */ [0x45] = "\x03\x19\x01",
+	/* RESET_B3_RESP */ [0x46] = "\x03\x01",
+	/* CONNECT_B3_T90_ACTIVE_RESP */ [0x47] = "\x03\x01",
+	/* MANUFACTURER_RESP */ [0x4e] = "\x03\x2a\x15\x21\x29\x01",
+};
+
+/*-------------------------------------------------------*/
+
+#define byteTLcpy(x, y)         *(u8 *)(x) = *(u8 *)(y);
+#define wordTLcpy(x, y)         *(u16 *)(x) = *(u16 *)(y);
+#define dwordTLcpy(x, y)        memcpy(x, y, 4);
+#define structTLcpy(x, y, l)    memcpy(x, y, l)
+#define structTLcpyovl(x, y, l) memmove(x, y, l)
+
+#define byteTRcpy(x, y)         *(u8 *)(y) = *(u8 *)(x);
+#define wordTRcpy(x, y)         *(u16 *)(y) = *(u16 *)(x);
+#define dwordTRcpy(x, y)        memcpy(y, x, 4);
+#define structTRcpy(x, y, l)    memcpy(y, x, l)
+#define structTRcpyovl(x, y, l) memmove(y, x, l)
+
+/*-------------------------------------------------------*/
+static unsigned command_2_index(u8 c, u8 sc)
+{
+	if (c & 0x80)
+		c = 0x9 + (c & 0x0f);
+	else if (c == 0x41)
+		c = 0x9 + 0x1;
+	if (c > 0x18)
+		c = 0x00;
+	return (sc & 3) * (0x9 + 0x9) + c;
+}
+
+/**
+ * capi_cmd2par() - find parameter string for CAPI 2.0 command/subcommand
+ * @cmd:	command number
+ * @subcmd:	subcommand number
+ *
+ * Return value: static string, NULL if command/subcommand unknown
+ */
+
+static unsigned char *capi_cmd2par(u8 cmd, u8 subcmd)
+{
+	return cpars[command_2_index(cmd, subcmd)];
+}
+
+/*-------------------------------------------------------*/
+#define TYP (cdef[cmsg->par[cmsg->p]].typ)
+#define OFF (((u8 *)cmsg) + cdef[cmsg->par[cmsg->p]].off)
+
+static void jumpcstruct(_cmsg *cmsg)
+{
+	unsigned layer;
+	for (cmsg->p++, layer = 1; layer;) {
+		/* $$$$$ assert (cmsg->p); */
+		cmsg->p++;
+		switch (TYP) {
+		case _CMSTRUCT:
+			layer++;
+			break;
+		case _CEND:
+			layer--;
+			break;
+		}
+	}
+}
+
+/*-------------------------------------------------------*/
+
+static char *mnames[] =
+{
+	[0x01] = "ALERT_REQ",
+	[0x02] = "CONNECT_REQ",
+	[0x04] = "DISCONNECT_REQ",
+	[0x05] = "LISTEN_REQ",
+	[0x08] = "INFO_REQ",
+	[0x09] = "FACILITY_REQ",
+	[0x0a] = "SELECT_B_PROTOCOL_REQ",
+	[0x0b] = "CONNECT_B3_REQ",
+	[0x0d] = "DISCONNECT_B3_REQ",
+	[0x0f] = "DATA_B3_REQ",
+	[0x10] = "RESET_B3_REQ",
+	[0x13] = "ALERT_CONF",
+	[0x14] = "CONNECT_CONF",
+	[0x16] = "DISCONNECT_CONF",
+	[0x17] = "LISTEN_CONF",
+	[0x18] = "MANUFACTURER_REQ",
+	[0x1a] = "INFO_CONF",
+	[0x1b] = "FACILITY_CONF",
+	[0x1c] = "SELECT_B_PROTOCOL_CONF",
+	[0x1d] = "CONNECT_B3_CONF",
+	[0x1f] = "DISCONNECT_B3_CONF",
+	[0x21] = "DATA_B3_CONF",
+	[0x22] = "RESET_B3_CONF",
+	[0x26] = "CONNECT_IND",
+	[0x27] = "CONNECT_ACTIVE_IND",
+	[0x28] = "DISCONNECT_IND",
+	[0x2a] = "MANUFACTURER_CONF",
+	[0x2c] = "INFO_IND",
+	[0x2d] = "FACILITY_IND",
+	[0x2f] = "CONNECT_B3_IND",
+	[0x30] = "CONNECT_B3_ACTIVE_IND",
+	[0x31] = "DISCONNECT_B3_IND",
+	[0x33] = "DATA_B3_IND",
+	[0x34] = "RESET_B3_IND",
+	[0x35] = "CONNECT_B3_T90_ACTIVE_IND",
+	[0x38] = "CONNECT_RESP",
+	[0x39] = "CONNECT_ACTIVE_RESP",
+	[0x3a] = "DISCONNECT_RESP",
+	[0x3c] = "MANUFACTURER_IND",
+	[0x3e] = "INFO_RESP",
+	[0x3f] = "FACILITY_RESP",
+	[0x41] = "CONNECT_B3_RESP",
+	[0x42] = "CONNECT_B3_ACTIVE_RESP",
+	[0x43] = "DISCONNECT_B3_RESP",
+	[0x45] = "DATA_B3_RESP",
+	[0x46] = "RESET_B3_RESP",
+	[0x47] = "CONNECT_B3_T90_ACTIVE_RESP",
+	[0x4e] = "MANUFACTURER_RESP"
+};
+
+/**
+ * capi_cmd2str() - convert CAPI 2.0 command/subcommand number to name
+ * @cmd:	command number
+ * @subcmd:	subcommand number
+ *
+ * Return value: static string
+ */
+
+char *capi_cmd2str(u8 cmd, u8 subcmd)
+{
+	char *result;
+
+	result = mnames[command_2_index(cmd, subcmd)];
+	if (result == NULL)
+		result = "INVALID_COMMAND";
+	return result;
+}
+
+
+/*-------------------------------------------------------*/
+
+#ifdef CONFIG_CAPI_TRACE
+
+/*-------------------------------------------------------*/
+
+static char *pnames[] =
+{
+	/*00 */ NULL,
+	/*01 */ NULL,
+	/*02 */ NULL,
+	/*03 */ "Controller/PLCI/NCCI",
+	/*04 */ "AdditionalInfo",
+	/*05 */ "B1configuration",
+	/*06 */ "B1protocol",
+	/*07 */ "B2configuration",
+	/*08 */ "B2protocol",
+	/*09 */ "B3configuration",
+	/*0a */ "B3protocol",
+	/*0b */ "BC",
+	/*0c */ "BChannelinformation",
+	/*0d */ "BProtocol",
+	/*0e */ "CalledPartyNumber",
+	/*0f */ "CalledPartySubaddress",
+	/*10 */ "CallingPartyNumber",
+	/*11 */ "CallingPartySubaddress",
+	/*12 */ "CIPmask",
+	/*13 */ "CIPmask2",
+	/*14 */ "CIPValue",
+	/*15 */ "Class",
+	/*16 */ "ConnectedNumber",
+	/*17 */ "ConnectedSubaddress",
+	/*18 */ "Data32",
+	/*19 */ "DataHandle",
+	/*1a */ "DataLength",
+	/*1b */ "FacilityConfirmationParameter",
+	/*1c */ "Facilitydataarray",
+	/*1d */ "FacilityIndicationParameter",
+	/*1e */ "FacilityRequestParameter",
+	/*1f */ "FacilitySelector",
+	/*20 */ "Flags",
+	/*21 */ "Function",
+	/*22 */ "HLC",
+	/*23 */ "Info",
+	/*24 */ "InfoElement",
+	/*25 */ "InfoMask",
+	/*26 */ "InfoNumber",
+	/*27 */ "Keypadfacility",
+	/*28 */ "LLC",
+	/*29 */ "ManuData",
+	/*2a */ "ManuID",
+	/*2b */ "NCPI",
+	/*2c */ "Reason",
+	/*2d */ "Reason_B3",
+	/*2e */ "Reject",
+	/*2f */ "Useruserdata"
+};
+
+#include <linux/stdarg.h>
+
+/*-------------------------------------------------------*/
+static _cdebbuf *bufprint(_cdebbuf *cdb, char *fmt, ...)
+{
+	va_list f;
+	size_t n, r;
+
+	if (!cdb)
+		return NULL;
+	va_start(f, fmt);
+	r = cdb->size - cdb->pos;
+	n = vsnprintf(cdb->p, r, fmt, f);
+	va_end(f);
+	if (n >= r) {
+		/* truncated, need bigger buffer */
+		size_t ns = 2 * cdb->size;
+		u_char *nb;
+
+		while ((ns - cdb->pos) <= n)
+			ns *= 2;
+		nb = kmalloc(ns, GFP_ATOMIC);
+		if (!nb) {
+			cdebbuf_free(cdb);
+			return NULL;
+		}
+		memcpy(nb, cdb->buf, cdb->pos);
+		kfree(cdb->buf);
+		nb[cdb->pos] = 0;
+		cdb->buf = nb;
+		cdb->p = cdb->buf + cdb->pos;
+		cdb->size = ns;
+		va_start(f, fmt);
+		r = cdb->size - cdb->pos;
+		n = vsnprintf(cdb->p, r, fmt, f);
+		va_end(f);
+	}
+	cdb->p += n;
+	cdb->pos += n;
+	return cdb;
+}
+
+static _cdebbuf *printstructlen(_cdebbuf *cdb, u8 *m, unsigned len)
+{
+	unsigned hex = 0;
+
+	if (!cdb)
+		return NULL;
+	for (; len; len--, m++)
+		if (isalnum(*m) || *m == ' ') {
+			if (hex)
+				cdb = bufprint(cdb, ">");
+			cdb = bufprint(cdb, "%c", *m);
+			hex = 0;
+		} else {
+			if (!hex)
+				cdb = bufprint(cdb, "<%02x", *m);
+			else
+				cdb = bufprint(cdb, " %02x", *m);
+			hex = 1;
+		}
+	if (hex)
+		cdb = bufprint(cdb, ">");
+	return cdb;
+}
+
+static _cdebbuf *printstruct(_cdebbuf *cdb, u8 *m)
+{
+	unsigned len;
+
+	if (m[0] != 0xff) {
+		len = m[0];
+		m += 1;
+	} else {
+		len = ((u16 *) (m + 1))[0];
+		m += 3;
+	}
+	cdb = printstructlen(cdb, m, len);
+	return cdb;
+}
+
+/*-------------------------------------------------------*/
+#define NAME (pnames[cmsg->par[cmsg->p]])
+
+static _cdebbuf *protocol_message_2_pars(_cdebbuf *cdb, _cmsg *cmsg, int level)
+{
+	if (!cmsg->par)
+		return NULL;	/* invalid command/subcommand */
+
+	for (; TYP != _CEND; cmsg->p++) {
+		int slen = 29 + 3 - level;
+		int i;
+
+		if (!cdb)
+			return NULL;
+		cdb = bufprint(cdb, "  ");
+		for (i = 0; i < level - 1; i++)
+			cdb = bufprint(cdb, " ");
+
+		switch (TYP) {
+		case _CBYTE:
+			cdb = bufprint(cdb, "%-*s = 0x%x\n", slen, NAME, *(u8 *) (cmsg->m + cmsg->l));
+			cmsg->l++;
+			break;
+		case _CWORD:
+			cdb = bufprint(cdb, "%-*s = 0x%x\n", slen, NAME, *(u16 *) (cmsg->m + cmsg->l));
+			cmsg->l += 2;
+			break;
+		case _CDWORD:
+			cdb = bufprint(cdb, "%-*s = 0x%lx\n", slen, NAME, *(u32 *) (cmsg->m + cmsg->l));
+			cmsg->l += 4;
+			break;
+		case _CSTRUCT:
+			cdb = bufprint(cdb, "%-*s = ", slen, NAME);
+			if (cmsg->m[cmsg->l] == '\0')
+				cdb = bufprint(cdb, "default");
+			else
+				cdb = printstruct(cdb, cmsg->m + cmsg->l);
+			cdb = bufprint(cdb, "\n");
+			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') {
+				cdb = bufprint(cdb, "%-*s = default\n", slen, NAME);
+				cmsg->l++;
+				jumpcstruct(cmsg);
+			} else {
+				char *name = NAME;
+				unsigned _l = cmsg->l;
+				cdb = bufprint(cdb, "%-*s\n", slen, name);
+				cmsg->l = (cmsg->m + _l)[0] == 255 ? cmsg->l + 3 : cmsg->l + 1;
+				cmsg->p++;
+				cdb = protocol_message_2_pars(cdb, cmsg, level + 1);
+			}
+			break;
+		}
+	}
+	return cdb;
+}
+/*-------------------------------------------------------*/
+
+static _cdebbuf *g_debbuf;
+static u_long g_debbuf_lock;
+static _cmsg *g_cmsg;
+
+static _cdebbuf *cdebbuf_alloc(void)
+{
+	_cdebbuf *cdb;
+
+	if (likely(!test_and_set_bit(1, &g_debbuf_lock))) {
+		cdb = g_debbuf;
+		goto init;
+	} else
+		cdb = kmalloc(sizeof(_cdebbuf), GFP_ATOMIC);
+	if (!cdb)
+		return NULL;
+	cdb->buf = kmalloc(CDEBUG_SIZE, GFP_ATOMIC);
+	if (!cdb->buf) {
+		kfree(cdb);
+		return NULL;
+	}
+	cdb->size = CDEBUG_SIZE;
+init:
+	cdb->buf[0] = 0;
+	cdb->p = cdb->buf;
+	cdb->pos = 0;
+	return cdb;
+}
+
+/**
+ * cdebbuf_free() - free CAPI debug buffer
+ * @cdb:	buffer to free
+ */
+
+void cdebbuf_free(_cdebbuf *cdb)
+{
+	if (likely(cdb == g_debbuf)) {
+		test_and_clear_bit(1, &g_debbuf_lock);
+		return;
+	}
+	if (likely(cdb))
+		kfree(cdb->buf);
+	kfree(cdb);
+}
+
+
+/**
+ * capi_message2str() - format CAPI 2.0 message for printing
+ * @msg:	CAPI 2.0 message
+ *
+ * Allocates a CAPI debug buffer and fills it with a printable representation
+ * of the CAPI 2.0 message in @msg.
+ * Return value: allocated debug buffer, NULL on error
+ * The returned buffer should be freed by a call to cdebbuf_free() after use.
+ */
+
+_cdebbuf *capi_message2str(u8 *msg)
+{
+	_cdebbuf *cdb;
+	_cmsg	*cmsg;
+
+	cdb = cdebbuf_alloc();
+	if (unlikely(!cdb))
+		return NULL;
+	if (likely(cdb == g_debbuf))
+		cmsg = g_cmsg;
+	else
+		cmsg = kmalloc(sizeof(_cmsg), GFP_ATOMIC);
+	if (unlikely(!cmsg)) {
+		cdebbuf_free(cdb);
+		return NULL;
+	}
+	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);
+
+	cdb = bufprint(cdb, "%-26s ID=%03d #0x%04x LEN=%04d\n",
+		       capi_cmd2str(cmsg->Command, cmsg->Subcommand),
+		       ((unsigned short *) msg)[1],
+		       ((unsigned short *) msg)[3],
+		       ((unsigned short *) msg)[0]);
+
+	cdb = protocol_message_2_pars(cdb, cmsg, 1);
+	if (unlikely(cmsg != g_cmsg))
+		kfree(cmsg);
+	return cdb;
+}
+
+int __init cdebug_init(void)
+{
+	g_cmsg = kmalloc(sizeof(_cmsg), GFP_KERNEL);
+	if (!g_cmsg)
+		return -ENOMEM;
+	g_debbuf = kmalloc(sizeof(_cdebbuf), GFP_KERNEL);
+	if (!g_debbuf) {
+		kfree(g_cmsg);
+		return -ENOMEM;
+	}
+	g_debbuf->buf = kmalloc(CDEBUG_GSIZE, GFP_KERNEL);
+	if (!g_debbuf->buf) {
+		kfree(g_cmsg);
+		kfree(g_debbuf);
+		return -ENOMEM;
+	}
+	g_debbuf->size = CDEBUG_GSIZE;
+	g_debbuf->buf[0] = 0;
+	g_debbuf->p = g_debbuf->buf;
+	g_debbuf->pos = 0;
+	return 0;
+}
+
+void cdebug_exit(void)
+{
+	if (g_debbuf)
+		kfree(g_debbuf->buf);
+	kfree(g_debbuf);
+	kfree(g_cmsg);
+}
+
+#else /* !CONFIG_CAPI_TRACE */
+
+static _cdebbuf g_debbuf = {"CONFIG_CAPI_TRACE not enabled", NULL, 0, 0};
+
+_cdebbuf *capi_message2str(u8 *msg)
+{
+	return &g_debbuf;
+}
+
+_cdebbuf *capi_cmsg2str(_cmsg *cmsg)
+{
+	return &g_debbuf;
+}
+
+void cdebbuf_free(_cdebbuf *cdb)
+{
+}
+
+int __init cdebug_init(void)
+{
+	return 0;
+}
+
+void cdebug_exit(void)
+{
+}
+
+#endif