drivers/isdn/capi/capiutil.c - linux/kernel/git/gregkh/usb - Git at Google

 /* $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 <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
	/* $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 <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