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/drivers/isdn/capi/capiutil.c

http://github.com/mirrors/linux
C | 677 lines | 517 code | 61 blank | 99 comment | 55 complexity | f0af5f6aea41253e665753f03bf3a2c2 MD5 | raw file
  1/* $Id: capiutil.c,v 1.13.6.4 2001/09/23 22:24:33 kai Exp $
  2 *
  3 * CAPI 2.0 convert capi message to capi message struct
  4 *
  5 * From CAPI 2.0 Development Kit AVM 1995 (msg.c)
  6 * Rewritten for Linux 1996 by Carsten Paeth <calle@calle.de>
  7 *
  8 * This software may be used and distributed according to the terms
  9 * of the GNU General Public License, incorporated herein by reference.
 10 *
 11 */
 12
 13#include <linux/module.h>
 14#include <linux/string.h>
 15#include <linux/ctype.h>
 16#include <linux/stddef.h>
 17#include <linux/kernel.h>
 18#include <linux/mm.h>
 19#include <linux/init.h>
 20#include <linux/isdn/capiutil.h>
 21#include <linux/slab.h>
 22
 23#include "kcapi.h"
 24
 25/* from CAPI2.0 DDK AVM Berlin GmbH */
 26
 27typedef struct {
 28	int typ;
 29	size_t off;
 30} _cdef;
 31
 32#define _CBYTE	       1
 33#define _CWORD	       2
 34#define _CDWORD        3
 35#define _CSTRUCT       4
 36#define _CMSTRUCT      5
 37#define _CEND	       6
 38
 39static _cdef cdef[] =
 40{
 41	/*00 */
 42	{_CEND},
 43	/*01 */
 44	{_CEND},
 45	/*02 */
 46	{_CEND},
 47	/*03 */
 48	{_CDWORD, offsetof(_cmsg, adr.adrController)},
 49	/*04 */
 50	{_CMSTRUCT, offsetof(_cmsg, AdditionalInfo)},
 51	/*05 */
 52	{_CSTRUCT, offsetof(_cmsg, B1configuration)},
 53	/*06 */
 54	{_CWORD, offsetof(_cmsg, B1protocol)},
 55	/*07 */
 56	{_CSTRUCT, offsetof(_cmsg, B2configuration)},
 57	/*08 */
 58	{_CWORD, offsetof(_cmsg, B2protocol)},
 59	/*09 */
 60	{_CSTRUCT, offsetof(_cmsg, B3configuration)},
 61	/*0a */
 62	{_CWORD, offsetof(_cmsg, B3protocol)},
 63	/*0b */
 64	{_CSTRUCT, offsetof(_cmsg, BC)},
 65	/*0c */
 66	{_CSTRUCT, offsetof(_cmsg, BChannelinformation)},
 67	/*0d */
 68	{_CMSTRUCT, offsetof(_cmsg, BProtocol)},
 69	/*0e */
 70	{_CSTRUCT, offsetof(_cmsg, CalledPartyNumber)},
 71	/*0f */
 72	{_CSTRUCT, offsetof(_cmsg, CalledPartySubaddress)},
 73	/*10 */
 74	{_CSTRUCT, offsetof(_cmsg, CallingPartyNumber)},
 75	/*11 */
 76	{_CSTRUCT, offsetof(_cmsg, CallingPartySubaddress)},
 77	/*12 */
 78	{_CDWORD, offsetof(_cmsg, CIPmask)},
 79	/*13 */
 80	{_CDWORD, offsetof(_cmsg, CIPmask2)},
 81	/*14 */
 82	{_CWORD, offsetof(_cmsg, CIPValue)},
 83	/*15 */
 84	{_CDWORD, offsetof(_cmsg, Class)},
 85	/*16 */
 86	{_CSTRUCT, offsetof(_cmsg, ConnectedNumber)},
 87	/*17 */
 88	{_CSTRUCT, offsetof(_cmsg, ConnectedSubaddress)},
 89	/*18 */
 90	{_CDWORD, offsetof(_cmsg, Data)},
 91	/*19 */
 92	{_CWORD, offsetof(_cmsg, DataHandle)},
 93	/*1a */
 94	{_CWORD, offsetof(_cmsg, DataLength)},
 95	/*1b */
 96	{_CSTRUCT, offsetof(_cmsg, FacilityConfirmationParameter)},
 97	/*1c */
 98	{_CSTRUCT, offsetof(_cmsg, Facilitydataarray)},
 99	/*1d */
100	{_CSTRUCT, offsetof(_cmsg, FacilityIndicationParameter)},
101	/*1e */
102	{_CSTRUCT, offsetof(_cmsg, FacilityRequestParameter)},
103	/*1f */
104	{_CWORD, offsetof(_cmsg, FacilitySelector)},
105	/*20 */
106	{_CWORD, offsetof(_cmsg, Flags)},
107	/*21 */
108	{_CDWORD, offsetof(_cmsg, Function)},
109	/*22 */
110	{_CSTRUCT, offsetof(_cmsg, HLC)},
111	/*23 */
112	{_CWORD, offsetof(_cmsg, Info)},
113	/*24 */
114	{_CSTRUCT, offsetof(_cmsg, InfoElement)},
115	/*25 */
116	{_CDWORD, offsetof(_cmsg, InfoMask)},
117	/*26 */
118	{_CWORD, offsetof(_cmsg, InfoNumber)},
119	/*27 */
120	{_CSTRUCT, offsetof(_cmsg, Keypadfacility)},
121	/*28 */
122	{_CSTRUCT, offsetof(_cmsg, LLC)},
123	/*29 */
124	{_CSTRUCT, offsetof(_cmsg, ManuData)},
125	/*2a */
126	{_CDWORD, offsetof(_cmsg, ManuID)},
127	/*2b */
128	{_CSTRUCT, offsetof(_cmsg, NCPI)},
129	/*2c */
130	{_CWORD, offsetof(_cmsg, Reason)},
131	/*2d */
132	{_CWORD, offsetof(_cmsg, Reason_B3)},
133	/*2e */
134	{_CWORD, offsetof(_cmsg, Reject)},
135	/*2f */
136	{_CSTRUCT, offsetof(_cmsg, Useruserdata)}
137};
138
139static unsigned char *cpars[] =
140{
141	/* ALERT_REQ */ [0x01] = "\x03\x04\x0c\x27\x2f\x1c\x01\x01",
142	/* 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",
143	/* DISCONNECT_REQ */ [0x04] = "\x03\x04\x0c\x27\x2f\x1c\x01\x01",
144	/* LISTEN_REQ */ [0x05] = "\x03\x25\x12\x13\x10\x11\x01",
145	/* INFO_REQ */ [0x08] = "\x03\x0e\x04\x0c\x27\x2f\x1c\x01\x01",
146	/* FACILITY_REQ */ [0x09] = "\x03\x1f\x1e\x01",
147	/* SELECT_B_PROTOCOL_REQ */ [0x0a] = "\x03\x0d\x06\x08\x0a\x05\x07\x09\x01\x01",
148	/* CONNECT_B3_REQ */ [0x0b] = "\x03\x2b\x01",
149	/* DISCONNECT_B3_REQ */ [0x0d] = "\x03\x2b\x01",
150	/* DATA_B3_REQ */ [0x0f] = "\x03\x18\x1a\x19\x20\x01",
151	/* RESET_B3_REQ */ [0x10] = "\x03\x2b\x01",
152	/* ALERT_CONF */ [0x13] = "\x03\x23\x01",
153	/* CONNECT_CONF */ [0x14] = "\x03\x23\x01",
154	/* DISCONNECT_CONF */ [0x16] = "\x03\x23\x01",
155	/* LISTEN_CONF */ [0x17] = "\x03\x23\x01",
156	/* MANUFACTURER_REQ */ [0x18] = "\x03\x2a\x15\x21\x29\x01",
157	/* INFO_CONF */ [0x1a] = "\x03\x23\x01",
158	/* FACILITY_CONF */ [0x1b] = "\x03\x23\x1f\x1b\x01",
159	/* SELECT_B_PROTOCOL_CONF */ [0x1c] = "\x03\x23\x01",
160	/* CONNECT_B3_CONF */ [0x1d] = "\x03\x23\x01",
161	/* DISCONNECT_B3_CONF */ [0x1f] = "\x03\x23\x01",
162	/* DATA_B3_CONF */ [0x21] = "\x03\x19\x23\x01",
163	/* RESET_B3_CONF */ [0x22] = "\x03\x23\x01",
164	/* CONNECT_IND */ [0x26] = "\x03\x14\x0e\x10\x0f\x11\x0b\x28\x22\x04\x0c\x27\x2f\x1c\x01\x01",
165	/* CONNECT_ACTIVE_IND */ [0x27] = "\x03\x16\x17\x28\x01",
166	/* DISCONNECT_IND */ [0x28] = "\x03\x2c\x01",
167	/* MANUFACTURER_CONF */ [0x2a] = "\x03\x2a\x15\x21\x29\x01",
168	/* INFO_IND */ [0x2c] = "\x03\x26\x24\x01",
169	/* FACILITY_IND */ [0x2d] = "\x03\x1f\x1d\x01",
170	/* CONNECT_B3_IND */ [0x2f] = "\x03\x2b\x01",
171	/* CONNECT_B3_ACTIVE_IND */ [0x30] = "\x03\x2b\x01",
172	/* DISCONNECT_B3_IND */ [0x31] = "\x03\x2d\x2b\x01",
173	/* DATA_B3_IND */ [0x33] = "\x03\x18\x1a\x19\x20\x01",
174	/* RESET_B3_IND */ [0x34] = "\x03\x2b\x01",
175	/* CONNECT_B3_T90_ACTIVE_IND */ [0x35] = "\x03\x2b\x01",
176	/* CONNECT_RESP */ [0x38] = "\x03\x2e\x0d\x06\x08\x0a\x05\x07\x09\x01\x16\x17\x28\x04\x0c\x27\x2f\x1c\x01\x01",
177	/* CONNECT_ACTIVE_RESP */ [0x39] = "\x03\x01",
178	/* DISCONNECT_RESP */ [0x3a] = "\x03\x01",
179	/* MANUFACTURER_IND */ [0x3c] = "\x03\x2a\x15\x21\x29\x01",
180	/* INFO_RESP */ [0x3e] = "\x03\x01",
181	/* FACILITY_RESP */ [0x3f] = "\x03\x1f\x01",
182	/* CONNECT_B3_RESP */ [0x41] = "\x03\x2e\x2b\x01",
183	/* CONNECT_B3_ACTIVE_RESP */ [0x42] = "\x03\x01",
184	/* DISCONNECT_B3_RESP */ [0x43] = "\x03\x01",
185	/* DATA_B3_RESP */ [0x45] = "\x03\x19\x01",
186	/* RESET_B3_RESP */ [0x46] = "\x03\x01",
187	/* CONNECT_B3_T90_ACTIVE_RESP */ [0x47] = "\x03\x01",
188	/* MANUFACTURER_RESP */ [0x4e] = "\x03\x2a\x15\x21\x29\x01",
189};
190
191/*-------------------------------------------------------*/
192
193#define byteTLcpy(x, y)         *(u8 *)(x) = *(u8 *)(y);
194#define wordTLcpy(x, y)         *(u16 *)(x) = *(u16 *)(y);
195#define dwordTLcpy(x, y)        memcpy(x, y, 4);
196#define structTLcpy(x, y, l)    memcpy(x, y, l)
197#define structTLcpyovl(x, y, l) memmove(x, y, l)
198
199#define byteTRcpy(x, y)         *(u8 *)(y) = *(u8 *)(x);
200#define wordTRcpy(x, y)         *(u16 *)(y) = *(u16 *)(x);
201#define dwordTRcpy(x, y)        memcpy(y, x, 4);
202#define structTRcpy(x, y, l)    memcpy(y, x, l)
203#define structTRcpyovl(x, y, l) memmove(y, x, l)
204
205/*-------------------------------------------------------*/
206static unsigned command_2_index(u8 c, u8 sc)
207{
208	if (c & 0x80)
209		c = 0x9 + (c & 0x0f);
210	else if (c == 0x41)
211		c = 0x9 + 0x1;
212	if (c > 0x18)
213		c = 0x00;
214	return (sc & 3) * (0x9 + 0x9) + c;
215}
216
217/**
218 * capi_cmd2par() - find parameter string for CAPI 2.0 command/subcommand
219 * @cmd:	command number
220 * @subcmd:	subcommand number
221 *
222 * Return value: static string, NULL if command/subcommand unknown
223 */
224
225static unsigned char *capi_cmd2par(u8 cmd, u8 subcmd)
226{
227	return cpars[command_2_index(cmd, subcmd)];
228}
229
230/*-------------------------------------------------------*/
231#define TYP (cdef[cmsg->par[cmsg->p]].typ)
232#define OFF (((u8 *)cmsg) + cdef[cmsg->par[cmsg->p]].off)
233
234static void jumpcstruct(_cmsg *cmsg)
235{
236	unsigned layer;
237	for (cmsg->p++, layer = 1; layer;) {
238		/* $$$$$ assert (cmsg->p); */
239		cmsg->p++;
240		switch (TYP) {
241		case _CMSTRUCT:
242			layer++;
243			break;
244		case _CEND:
245			layer--;
246			break;
247		}
248	}
249}
250
251/*-------------------------------------------------------*/
252
253static char *mnames[] =
254{
255	[0x01] = "ALERT_REQ",
256	[0x02] = "CONNECT_REQ",
257	[0x04] = "DISCONNECT_REQ",
258	[0x05] = "LISTEN_REQ",
259	[0x08] = "INFO_REQ",
260	[0x09] = "FACILITY_REQ",
261	[0x0a] = "SELECT_B_PROTOCOL_REQ",
262	[0x0b] = "CONNECT_B3_REQ",
263	[0x0d] = "DISCONNECT_B3_REQ",
264	[0x0f] = "DATA_B3_REQ",
265	[0x10] = "RESET_B3_REQ",
266	[0x13] = "ALERT_CONF",
267	[0x14] = "CONNECT_CONF",
268	[0x16] = "DISCONNECT_CONF",
269	[0x17] = "LISTEN_CONF",
270	[0x18] = "MANUFACTURER_REQ",
271	[0x1a] = "INFO_CONF",
272	[0x1b] = "FACILITY_CONF",
273	[0x1c] = "SELECT_B_PROTOCOL_CONF",
274	[0x1d] = "CONNECT_B3_CONF",
275	[0x1f] = "DISCONNECT_B3_CONF",
276	[0x21] = "DATA_B3_CONF",
277	[0x22] = "RESET_B3_CONF",
278	[0x26] = "CONNECT_IND",
279	[0x27] = "CONNECT_ACTIVE_IND",
280	[0x28] = "DISCONNECT_IND",
281	[0x2a] = "MANUFACTURER_CONF",
282	[0x2c] = "INFO_IND",
283	[0x2d] = "FACILITY_IND",
284	[0x2f] = "CONNECT_B3_IND",
285	[0x30] = "CONNECT_B3_ACTIVE_IND",
286	[0x31] = "DISCONNECT_B3_IND",
287	[0x33] = "DATA_B3_IND",
288	[0x34] = "RESET_B3_IND",
289	[0x35] = "CONNECT_B3_T90_ACTIVE_IND",
290	[0x38] = "CONNECT_RESP",
291	[0x39] = "CONNECT_ACTIVE_RESP",
292	[0x3a] = "DISCONNECT_RESP",
293	[0x3c] = "MANUFACTURER_IND",
294	[0x3e] = "INFO_RESP",
295	[0x3f] = "FACILITY_RESP",
296	[0x41] = "CONNECT_B3_RESP",
297	[0x42] = "CONNECT_B3_ACTIVE_RESP",
298	[0x43] = "DISCONNECT_B3_RESP",
299	[0x45] = "DATA_B3_RESP",
300	[0x46] = "RESET_B3_RESP",
301	[0x47] = "CONNECT_B3_T90_ACTIVE_RESP",
302	[0x4e] = "MANUFACTURER_RESP"
303};
304
305/**
306 * capi_cmd2str() - convert CAPI 2.0 command/subcommand number to name
307 * @cmd:	command number
308 * @subcmd:	subcommand number
309 *
310 * Return value: static string
311 */
312
313char *capi_cmd2str(u8 cmd, u8 subcmd)
314{
315	char *result;
316
317	result = mnames[command_2_index(cmd, subcmd)];
318	if (result == NULL)
319		result = "INVALID_COMMAND";
320	return result;
321}
322
323
324/*-------------------------------------------------------*/
325
326#ifdef CONFIG_CAPI_TRACE
327
328/*-------------------------------------------------------*/
329
330static char *pnames[] =
331{
332	/*00 */ NULL,
333	/*01 */ NULL,
334	/*02 */ NULL,
335	/*03 */ "Controller/PLCI/NCCI",
336	/*04 */ "AdditionalInfo",
337	/*05 */ "B1configuration",
338	/*06 */ "B1protocol",
339	/*07 */ "B2configuration",
340	/*08 */ "B2protocol",
341	/*09 */ "B3configuration",
342	/*0a */ "B3protocol",
343	/*0b */ "BC",
344	/*0c */ "BChannelinformation",
345	/*0d */ "BProtocol",
346	/*0e */ "CalledPartyNumber",
347	/*0f */ "CalledPartySubaddress",
348	/*10 */ "CallingPartyNumber",
349	/*11 */ "CallingPartySubaddress",
350	/*12 */ "CIPmask",
351	/*13 */ "CIPmask2",
352	/*14 */ "CIPValue",
353	/*15 */ "Class",
354	/*16 */ "ConnectedNumber",
355	/*17 */ "ConnectedSubaddress",
356	/*18 */ "Data32",
357	/*19 */ "DataHandle",
358	/*1a */ "DataLength",
359	/*1b */ "FacilityConfirmationParameter",
360	/*1c */ "Facilitydataarray",
361	/*1d */ "FacilityIndicationParameter",
362	/*1e */ "FacilityRequestParameter",
363	/*1f */ "FacilitySelector",
364	/*20 */ "Flags",
365	/*21 */ "Function",
366	/*22 */ "HLC",
367	/*23 */ "Info",
368	/*24 */ "InfoElement",
369	/*25 */ "InfoMask",
370	/*26 */ "InfoNumber",
371	/*27 */ "Keypadfacility",
372	/*28 */ "LLC",
373	/*29 */ "ManuData",
374	/*2a */ "ManuID",
375	/*2b */ "NCPI",
376	/*2c */ "Reason",
377	/*2d */ "Reason_B3",
378	/*2e */ "Reject",
379	/*2f */ "Useruserdata"
380};
381
382#include <stdarg.h>
383
384/*-------------------------------------------------------*/
385static _cdebbuf *bufprint(_cdebbuf *cdb, char *fmt, ...)
386{
387	va_list f;
388	size_t n, r;
389
390	if (!cdb)
391		return NULL;
392	va_start(f, fmt);
393	r = cdb->size - cdb->pos;
394	n = vsnprintf(cdb->p, r, fmt, f);
395	va_end(f);
396	if (n >= r) {
397		/* truncated, need bigger buffer */
398		size_t ns = 2 * cdb->size;
399		u_char *nb;
400
401		while ((ns - cdb->pos) <= n)
402			ns *= 2;
403		nb = kmalloc(ns, GFP_ATOMIC);
404		if (!nb) {
405			cdebbuf_free(cdb);
406			return NULL;
407		}
408		memcpy(nb, cdb->buf, cdb->pos);
409		kfree(cdb->buf);
410		nb[cdb->pos] = 0;
411		cdb->buf = nb;
412		cdb->p = cdb->buf + cdb->pos;
413		cdb->size = ns;
414		va_start(f, fmt);
415		r = cdb->size - cdb->pos;
416		n = vsnprintf(cdb->p, r, fmt, f);
417		va_end(f);
418	}
419	cdb->p += n;
420	cdb->pos += n;
421	return cdb;
422}
423
424static _cdebbuf *printstructlen(_cdebbuf *cdb, u8 *m, unsigned len)
425{
426	unsigned hex = 0;
427
428	if (!cdb)
429		return NULL;
430	for (; len; len--, m++)
431		if (isalnum(*m) || *m == ' ') {
432			if (hex)
433				cdb = bufprint(cdb, ">");
434			cdb = bufprint(cdb, "%c", *m);
435			hex = 0;
436		} else {
437			if (!hex)
438				cdb = bufprint(cdb, "<%02x", *m);
439			else
440				cdb = bufprint(cdb, " %02x", *m);
441			hex = 1;
442		}
443	if (hex)
444		cdb = bufprint(cdb, ">");
445	return cdb;
446}
447
448static _cdebbuf *printstruct(_cdebbuf *cdb, u8 *m)
449{
450	unsigned len;
451
452	if (m[0] != 0xff) {
453		len = m[0];
454		m += 1;
455	} else {
456		len = ((u16 *) (m + 1))[0];
457		m += 3;
458	}
459	cdb = printstructlen(cdb, m, len);
460	return cdb;
461}
462
463/*-------------------------------------------------------*/
464#define NAME (pnames[cmsg->par[cmsg->p]])
465
466static _cdebbuf *protocol_message_2_pars(_cdebbuf *cdb, _cmsg *cmsg, int level)
467{
468	if (!cmsg->par)
469		return NULL;	/* invalid command/subcommand */
470
471	for (; TYP != _CEND; cmsg->p++) {
472		int slen = 29 + 3 - level;
473		int i;
474
475		if (!cdb)
476			return NULL;
477		cdb = bufprint(cdb, "  ");
478		for (i = 0; i < level - 1; i++)
479			cdb = bufprint(cdb, " ");
480
481		switch (TYP) {
482		case _CBYTE:
483			cdb = bufprint(cdb, "%-*s = 0x%x\n", slen, NAME, *(u8 *) (cmsg->m + cmsg->l));
484			cmsg->l++;
485			break;
486		case _CWORD:
487			cdb = bufprint(cdb, "%-*s = 0x%x\n", slen, NAME, *(u16 *) (cmsg->m + cmsg->l));
488			cmsg->l += 2;
489			break;
490		case _CDWORD:
491			cdb = bufprint(cdb, "%-*s = 0x%lx\n", slen, NAME, *(u32 *) (cmsg->m + cmsg->l));
492			cmsg->l += 4;
493			break;
494		case _CSTRUCT:
495			cdb = bufprint(cdb, "%-*s = ", slen, NAME);
496			if (cmsg->m[cmsg->l] == '\0')
497				cdb = bufprint(cdb, "default");
498			else
499				cdb = printstruct(cdb, cmsg->m + cmsg->l);
500			cdb = bufprint(cdb, "\n");
501			if (cmsg->m[cmsg->l] != 0xff)
502				cmsg->l += 1 + cmsg->m[cmsg->l];
503			else
504				cmsg->l += 3 + *(u16 *) (cmsg->m + cmsg->l + 1);
505
506			break;
507
508		case _CMSTRUCT:
509/*----- Metastruktur 0 -----*/
510			if (cmsg->m[cmsg->l] == '\0') {
511				cdb = bufprint(cdb, "%-*s = default\n", slen, NAME);
512				cmsg->l++;
513				jumpcstruct(cmsg);
514			} else {
515				char *name = NAME;
516				unsigned _l = cmsg->l;
517				cdb = bufprint(cdb, "%-*s\n", slen, name);
518				cmsg->l = (cmsg->m + _l)[0] == 255 ? cmsg->l + 3 : cmsg->l + 1;
519				cmsg->p++;
520				cdb = protocol_message_2_pars(cdb, cmsg, level + 1);
521			}
522			break;
523		}
524	}
525	return cdb;
526}
527/*-------------------------------------------------------*/
528
529static _cdebbuf *g_debbuf;
530static u_long g_debbuf_lock;
531static _cmsg *g_cmsg;
532
533static _cdebbuf *cdebbuf_alloc(void)
534{
535	_cdebbuf *cdb;
536
537	if (likely(!test_and_set_bit(1, &g_debbuf_lock))) {
538		cdb = g_debbuf;
539		goto init;
540	} else
541		cdb = kmalloc(sizeof(_cdebbuf), GFP_ATOMIC);
542	if (!cdb)
543		return NULL;
544	cdb->buf = kmalloc(CDEBUG_SIZE, GFP_ATOMIC);
545	if (!cdb->buf) {
546		kfree(cdb);
547		return NULL;
548	}
549	cdb->size = CDEBUG_SIZE;
550init:
551	cdb->buf[0] = 0;
552	cdb->p = cdb->buf;
553	cdb->pos = 0;
554	return cdb;
555}
556
557/**
558 * cdebbuf_free() - free CAPI debug buffer
559 * @cdb:	buffer to free
560 */
561
562void cdebbuf_free(_cdebbuf *cdb)
563{
564	if (likely(cdb == g_debbuf)) {
565		test_and_clear_bit(1, &g_debbuf_lock);
566		return;
567	}
568	if (likely(cdb))
569		kfree(cdb->buf);
570	kfree(cdb);
571}
572
573
574/**
575 * capi_message2str() - format CAPI 2.0 message for printing
576 * @msg:	CAPI 2.0 message
577 *
578 * Allocates a CAPI debug buffer and fills it with a printable representation
579 * of the CAPI 2.0 message in @msg.
580 * Return value: allocated debug buffer, NULL on error
581 * The returned buffer should be freed by a call to cdebbuf_free() after use.
582 */
583
584_cdebbuf *capi_message2str(u8 *msg)
585{
586	_cdebbuf *cdb;
587	_cmsg	*cmsg;
588
589	cdb = cdebbuf_alloc();
590	if (unlikely(!cdb))
591		return NULL;
592	if (likely(cdb == g_debbuf))
593		cmsg = g_cmsg;
594	else
595		cmsg = kmalloc(sizeof(_cmsg), GFP_ATOMIC);
596	if (unlikely(!cmsg)) {
597		cdebbuf_free(cdb);
598		return NULL;
599	}
600	cmsg->m = msg;
601	cmsg->l = 8;
602	cmsg->p = 0;
603	byteTRcpy(cmsg->m + 4, &cmsg->Command);
604	byteTRcpy(cmsg->m + 5, &cmsg->Subcommand);
605	cmsg->par = capi_cmd2par(cmsg->Command, cmsg->Subcommand);
606
607	cdb = bufprint(cdb, "%-26s ID=%03d #0x%04x LEN=%04d\n",
608		       capi_cmd2str(cmsg->Command, cmsg->Subcommand),
609		       ((unsigned short *) msg)[1],
610		       ((unsigned short *) msg)[3],
611		       ((unsigned short *) msg)[0]);
612
613	cdb = protocol_message_2_pars(cdb, cmsg, 1);
614	if (unlikely(cmsg != g_cmsg))
615		kfree(cmsg);
616	return cdb;
617}
618
619int __init cdebug_init(void)
620{
621	g_cmsg = kmalloc(sizeof(_cmsg), GFP_KERNEL);
622	if (!g_cmsg)
623		return -ENOMEM;
624	g_debbuf = kmalloc(sizeof(_cdebbuf), GFP_KERNEL);
625	if (!g_debbuf) {
626		kfree(g_cmsg);
627		return -ENOMEM;
628	}
629	g_debbuf->buf = kmalloc(CDEBUG_GSIZE, GFP_KERNEL);
630	if (!g_debbuf->buf) {
631		kfree(g_cmsg);
632		kfree(g_debbuf);
633		return -ENOMEM;
634	}
635	g_debbuf->size = CDEBUG_GSIZE;
636	g_debbuf->buf[0] = 0;
637	g_debbuf->p = g_debbuf->buf;
638	g_debbuf->pos = 0;
639	return 0;
640}
641
642void cdebug_exit(void)
643{
644	if (g_debbuf)
645		kfree(g_debbuf->buf);
646	kfree(g_debbuf);
647	kfree(g_cmsg);
648}
649
650#else /* !CONFIG_CAPI_TRACE */
651
652static _cdebbuf g_debbuf = {"CONFIG_CAPI_TRACE not enabled", NULL, 0, 0};
653
654_cdebbuf *capi_message2str(u8 *msg)
655{
656	return &g_debbuf;
657}
658
659_cdebbuf *capi_cmsg2str(_cmsg *cmsg)
660{
661	return &g_debbuf;
662}
663
664void cdebbuf_free(_cdebbuf *cdb)
665{
666}
667
668int __init cdebug_init(void)
669{
670	return 0;
671}
672
673void cdebug_exit(void)
674{
675}
676
677#endif