btif_util.cc revision 4de9bbcde79eb98dbfd56de292902549ac3e2bc1 
1/******************************************************************************
2 *
3 *  Copyright (c) 2014 The Android Open Source Project
4 *  Copyright (C) 2009-2012 Broadcom Corporation
5 *
6 *  Licensed under the Apache License, Version 2.0 (the "License");
7 *  you may not use this file except in compliance with the License.
8 *  You may obtain a copy of the License at:
9 *
10 *  http://www.apache.org/licenses/LICENSE-2.0
11 *
12 *  Unless required by applicable law or agreed to in writing, software
13 *  distributed under the License is distributed on an "AS IS" BASIS,
14 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 *  See the License for the specific language governing permissions and
16 *  limitations under the License.
17 *
18 ******************************************************************************/
19
20/************************************************************************************
21 *
22 *  Filename:      btif_util.c
23 *
24 *  Description:   Miscellaneous helper functions
25 *
26 *
27 ***********************************************************************************/
28
29#define LOG_TAG "bt_btif_util"
30
31#include "btif_util.h"
32
33#include <assert.h>
34#include <ctype.h>
35#include <netinet/in.h>
36#include <stdio.h>
37#include <stdlib.h>
38#include <string.h>
39
40#include <hardware/bt_av.h>
41
42#include "avrc_defs.h"
43#include "bta_ag_api.h"
44#include "bta_api.h"
45#include "bta_av_api.h"
46#include "bta_hf_client_api.h"
47#include "bta_hh_api.h"
48#include "bte.h"
49#include "btif_common.h"
50#include "btif_dm.h"
51#include "btu.h"
52#include "bt_common.h"
53
54/************************************************************************************
55**  Constants & Macros
56************************************************************************************/
57#define ISDIGIT(a)  (((a)>='0') && ((a)<='9'))
58#define ISXDIGIT(a) ((((a)>='0') && ((a)<='9'))||(((a)>='A') && ((a)<='F'))||(((a)>='a') && ((a)<='f')))
59
60/************************************************************************************
61**  Local type definitions
62************************************************************************************/
63
64/************************************************************************************
65**  Static variables
66************************************************************************************/
67
68/************************************************************************************
69**  Static functions
70************************************************************************************/
71
72/************************************************************************************
73**  Externs
74************************************************************************************/
75
76/************************************************************************************
77**  Functions
78************************************************************************************/
79
80/*****************************************************************************
81**   Logging helper functions
82*****************************************************************************/
83
84uint32_t devclass2uint(DEV_CLASS dev_class)
85{
86    uint32_t cod = 0;
87
88    if(dev_class != NULL)
89    {
90        /* if COD is 0, irrespective of the device type set it to Unclassified device */
91        cod = (dev_class[2]) | (dev_class[1] << 8) | (dev_class[0] << 16);
92    }
93    return cod;
94}
95void uint2devclass(uint32_t cod, DEV_CLASS dev_class)
96{
97    dev_class[2] = (uint8_t)cod;
98    dev_class[1] = (uint8_t)(cod >> 8);
99    dev_class[0] = (uint8_t)(cod >> 16);
100}
101
102static const uint8_t  sdp_base_uuid[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00,
103                                       0x80, 0x00, 0x00, 0x80, 0x5F, 0x9B, 0x34, 0xFB};
104
105void uuid16_to_uuid128(uint16_t uuid16, bt_uuid_t* uuid128)
106{
107    uint16_t uuid16_bo;
108    memset(uuid128, 0, sizeof(bt_uuid_t));
109
110    memcpy(uuid128->uu, sdp_base_uuid, MAX_UUID_SIZE);
111    uuid16_bo = ntohs(uuid16);
112    memcpy(uuid128->uu + 2, &uuid16_bo, sizeof(uint16_t));
113}
114
115bool string_to_uuid(const char *str, bt_uuid_t *p_uuid)
116{
117    assert(p_uuid);
118    if (str == NULL)
119        return false;
120
121    uint32_t uuid0, uuid4;
122    uint16_t uuid1, uuid2, uuid3, uuid5;
123
124    int rc = sscanf(str, "%08x-%04hx-%04hx-%04hx-%08x%04hx",
125                &uuid0, &uuid1, &uuid2, &uuid3, &uuid4, &uuid5);
126    if (rc != 6)
127        return false;
128
129    uuid0 = htonl(uuid0);
130    uuid1 = htons(uuid1);
131    uuid2 = htons(uuid2);
132    uuid3 = htons(uuid3);
133    uuid4 = htonl(uuid4);
134    uuid5 = htons(uuid5);
135
136    memcpy(&(p_uuid->uu[0]), &uuid0, 4);
137    memcpy(&(p_uuid->uu[4]), &uuid1, 2);
138    memcpy(&(p_uuid->uu[6]), &uuid2, 2);
139    memcpy(&(p_uuid->uu[8]), &uuid3, 2);
140    memcpy(&(p_uuid->uu[10]), &uuid4, 4);
141    memcpy(&(p_uuid->uu[14]), &uuid5, 2);
142
143    return true;
144}
145
146void uuid_to_string_legacy(bt_uuid_t *p_uuid, char *str)
147{
148    uint32_t uuid0, uuid4;
149    uint16_t uuid1, uuid2, uuid3, uuid5;
150
151    memcpy(&uuid0, &(p_uuid->uu[0]), 4);
152    memcpy(&uuid1, &(p_uuid->uu[4]), 2);
153    memcpy(&uuid2, &(p_uuid->uu[6]), 2);
154    memcpy(&uuid3, &(p_uuid->uu[8]), 2);
155    memcpy(&uuid4, &(p_uuid->uu[10]), 4);
156    memcpy(&uuid5, &(p_uuid->uu[14]), 2);
157
158    sprintf((char *)str, "%.8x-%.4x-%.4x-%.4x-%.8x%.4x",
159            ntohl(uuid0), ntohs(uuid1),
160            ntohs(uuid2), ntohs(uuid3),
161            ntohl(uuid4), ntohs(uuid5));
162    return;
163}
164
165/*****************************************************************************
166**  Function        ascii_2_hex
167**
168**  Description     This function converts an ASCII string into HEX
169**
170**  Returns         the number of hex bytes filled.
171*/
172int ascii_2_hex (const char *p_ascii, int len, uint8_t *p_hex)
173{
174    int     x;
175    uint8_t   c;
176
177    for (x = 0; (x < len) && (*p_ascii); x++)
178    {
179        if (ISDIGIT (*p_ascii))
180            c = (*p_ascii - '0') << 4;
181        else
182            c = (toupper(*p_ascii) - 'A' + 10) << 4;
183
184        p_ascii++;
185        if (*p_ascii)
186        {
187            if (ISDIGIT (*p_ascii))
188                c |= (*p_ascii - '0');
189            else
190                c |= (toupper(*p_ascii) - 'A' + 10);
191
192            p_ascii++;
193        }
194        *p_hex++ = c;
195    }
196
197    return (x);
198}
199
200const char* dump_dm_search_event(uint16_t event)
201{
202    switch(event)
203    {
204        CASE_RETURN_STR(BTA_DM_INQ_RES_EVT)
205        CASE_RETURN_STR(BTA_DM_INQ_CMPL_EVT)
206        CASE_RETURN_STR(BTA_DM_DISC_RES_EVT)
207        CASE_RETURN_STR(BTA_DM_DISC_BLE_RES_EVT)
208        CASE_RETURN_STR(BTA_DM_DISC_CMPL_EVT)
209        CASE_RETURN_STR(BTA_DM_DI_DISC_CMPL_EVT)
210        CASE_RETURN_STR(BTA_DM_SEARCH_CANCEL_CMPL_EVT)
211
212        default:
213            return "UNKNOWN MSG ID";
214     }
215}
216
217const char* dump_property_type(bt_property_type_t type)
218{
219    switch(type)
220    {
221        CASE_RETURN_STR(BT_PROPERTY_BDNAME)
222        CASE_RETURN_STR(BT_PROPERTY_BDADDR)
223        CASE_RETURN_STR(BT_PROPERTY_UUIDS)
224        CASE_RETURN_STR(BT_PROPERTY_CLASS_OF_DEVICE)
225        CASE_RETURN_STR(BT_PROPERTY_TYPE_OF_DEVICE)
226        CASE_RETURN_STR(BT_PROPERTY_REMOTE_RSSI)
227        CASE_RETURN_STR(BT_PROPERTY_ADAPTER_DISCOVERY_TIMEOUT)
228        CASE_RETURN_STR(BT_PROPERTY_ADAPTER_BONDED_DEVICES)
229        CASE_RETURN_STR(BT_PROPERTY_ADAPTER_SCAN_MODE)
230        CASE_RETURN_STR(BT_PROPERTY_REMOTE_FRIENDLY_NAME)
231
232        default:
233            return "UNKNOWN PROPERTY ID";
234    }
235}
236
237const char* dump_dm_event(uint16_t event)
238{
239    switch(event)
240    {
241        CASE_RETURN_STR(BTA_DM_ENABLE_EVT)
242        CASE_RETURN_STR(BTA_DM_DISABLE_EVT)
243        CASE_RETURN_STR(BTA_DM_PIN_REQ_EVT)
244        CASE_RETURN_STR(BTA_DM_AUTH_CMPL_EVT)
245        CASE_RETURN_STR(BTA_DM_AUTHORIZE_EVT)
246        CASE_RETURN_STR(BTA_DM_LINK_UP_EVT)
247        CASE_RETURN_STR(BTA_DM_LINK_DOWN_EVT)
248        CASE_RETURN_STR(BTA_DM_SIG_STRENGTH_EVT)
249        CASE_RETURN_STR(BTA_DM_BUSY_LEVEL_EVT)
250        CASE_RETURN_STR(BTA_DM_BOND_CANCEL_CMPL_EVT)
251        CASE_RETURN_STR(BTA_DM_SP_CFM_REQ_EVT)
252        CASE_RETURN_STR(BTA_DM_SP_KEY_NOTIF_EVT)
253        CASE_RETURN_STR(BTA_DM_SP_RMT_OOB_EVT)
254        CASE_RETURN_STR(BTA_DM_SP_KEYPRESS_EVT)
255        CASE_RETURN_STR(BTA_DM_ROLE_CHG_EVT)
256        CASE_RETURN_STR(BTA_DM_BLE_KEY_EVT)
257        CASE_RETURN_STR(BTA_DM_BLE_SEC_REQ_EVT)
258        CASE_RETURN_STR(BTA_DM_BLE_PASSKEY_NOTIF_EVT)
259        CASE_RETURN_STR(BTA_DM_BLE_PASSKEY_REQ_EVT)
260        CASE_RETURN_STR(BTA_DM_BLE_OOB_REQ_EVT)
261        CASE_RETURN_STR(BTA_DM_BLE_LOCAL_IR_EVT)
262        CASE_RETURN_STR(BTA_DM_BLE_LOCAL_ER_EVT)
263        CASE_RETURN_STR(BTA_DM_BLE_AUTH_CMPL_EVT)
264        CASE_RETURN_STR(BTA_DM_DEV_UNPAIRED_EVT)
265        CASE_RETURN_STR(BTA_DM_HW_ERROR_EVT)
266        CASE_RETURN_STR(BTA_DM_ENER_INFO_READ)
267
268        default:
269            return "UNKNOWN DM EVENT";
270    }
271}
272
273const char* dump_hf_event(uint16_t event)
274{
275    switch(event)
276    {
277        CASE_RETURN_STR(BTA_AG_ENABLE_EVT)
278        CASE_RETURN_STR(BTA_AG_REGISTER_EVT)
279        CASE_RETURN_STR(BTA_AG_OPEN_EVT)
280        CASE_RETURN_STR(BTA_AG_CLOSE_EVT)
281        CASE_RETURN_STR(BTA_AG_CONN_EVT)
282        CASE_RETURN_STR(BTA_AG_AUDIO_OPEN_EVT)
283        CASE_RETURN_STR(BTA_AG_AUDIO_CLOSE_EVT)
284        CASE_RETURN_STR(BTA_AG_SPK_EVT)
285        CASE_RETURN_STR(BTA_AG_MIC_EVT)
286        CASE_RETURN_STR(BTA_AG_AT_CKPD_EVT)
287        CASE_RETURN_STR(BTA_AG_DISABLE_EVT)
288#if (BTM_WBS_INCLUDED == TRUE)
289        CASE_RETURN_STR(BTA_AG_WBS_EVT)
290#endif
291        CASE_RETURN_STR(BTA_AG_AT_A_EVT)
292        CASE_RETURN_STR(BTA_AG_AT_D_EVT)
293        CASE_RETURN_STR(BTA_AG_AT_CHLD_EVT)
294        CASE_RETURN_STR(BTA_AG_AT_CHUP_EVT)
295        CASE_RETURN_STR(BTA_AG_AT_CIND_EVT)
296        CASE_RETURN_STR(BTA_AG_AT_VTS_EVT)
297        CASE_RETURN_STR(BTA_AG_AT_BINP_EVT)
298        CASE_RETURN_STR(BTA_AG_AT_BLDN_EVT)
299        CASE_RETURN_STR(BTA_AG_AT_BVRA_EVT)
300        CASE_RETURN_STR(BTA_AG_AT_NREC_EVT)
301        CASE_RETURN_STR(BTA_AG_AT_CNUM_EVT)
302        CASE_RETURN_STR(BTA_AG_AT_BTRH_EVT)
303        CASE_RETURN_STR(BTA_AG_AT_CLCC_EVT)
304        CASE_RETURN_STR(BTA_AG_AT_COPS_EVT)
305        CASE_RETURN_STR(BTA_AG_AT_UNAT_EVT)
306        CASE_RETURN_STR(BTA_AG_AT_CBC_EVT)
307        CASE_RETURN_STR(BTA_AG_AT_BAC_EVT)
308        CASE_RETURN_STR(BTA_AG_AT_BCS_EVT)
309        CASE_RETURN_STR(BTA_AG_AT_BIND_EVT)
310        CASE_RETURN_STR(BTA_AG_AT_BIEV_EVT)
311
312        default:
313            return "UNKNOWN MSG ID";
314     }
315}
316
317const char* dump_hf_client_event(uint16_t event)
318{
319    switch(event)
320    {
321        CASE_RETURN_STR(BTA_HF_CLIENT_ENABLE_EVT)
322        CASE_RETURN_STR(BTA_HF_CLIENT_REGISTER_EVT)
323        CASE_RETURN_STR(BTA_HF_CLIENT_OPEN_EVT)
324        CASE_RETURN_STR(BTA_HF_CLIENT_CLOSE_EVT)
325        CASE_RETURN_STR(BTA_HF_CLIENT_CONN_EVT)
326        CASE_RETURN_STR(BTA_HF_CLIENT_AUDIO_OPEN_EVT)
327        CASE_RETURN_STR(BTA_HF_CLIENT_AUDIO_MSBC_OPEN_EVT)
328        CASE_RETURN_STR(BTA_HF_CLIENT_AUDIO_CLOSE_EVT)
329        CASE_RETURN_STR(BTA_HF_CLIENT_SPK_EVT)
330        CASE_RETURN_STR(BTA_HF_CLIENT_MIC_EVT)
331        CASE_RETURN_STR(BTA_HF_CLIENT_DISABLE_EVT)
332        CASE_RETURN_STR(BTA_HF_CLIENT_IND_EVT)
333        CASE_RETURN_STR(BTA_HF_CLIENT_VOICE_REC_EVT)
334        CASE_RETURN_STR(BTA_HF_CLIENT_OPERATOR_NAME_EVT)
335        CASE_RETURN_STR(BTA_HF_CLIENT_CLIP_EVT)
336        CASE_RETURN_STR(BTA_HF_CLIENT_CCWA_EVT)
337        CASE_RETURN_STR(BTA_HF_CLIENT_AT_RESULT_EVT)
338        CASE_RETURN_STR(BTA_HF_CLIENT_CLCC_EVT)
339        CASE_RETURN_STR(BTA_HF_CLIENT_CNUM_EVT)
340        CASE_RETURN_STR(BTA_HF_CLIENT_BTRH_EVT)
341        CASE_RETURN_STR(BTA_HF_CLIENT_BSIR_EVT)
342        CASE_RETURN_STR(BTA_HF_CLIENT_BINP_EVT)
343        CASE_RETURN_STR(BTA_HF_CLIENT_RING_INDICATION)
344        default:
345            return "UNKNOWN MSG ID";
346     }
347}
348
349const char* dump_hh_event(uint16_t event)
350{
351    switch(event)
352    {
353        CASE_RETURN_STR(BTA_HH_ENABLE_EVT)
354        CASE_RETURN_STR(BTA_HH_DISABLE_EVT)
355        CASE_RETURN_STR(BTA_HH_OPEN_EVT)
356        CASE_RETURN_STR(BTA_HH_CLOSE_EVT)
357        CASE_RETURN_STR(BTA_HH_GET_DSCP_EVT)
358        CASE_RETURN_STR(BTA_HH_GET_PROTO_EVT)
359        CASE_RETURN_STR(BTA_HH_GET_RPT_EVT)
360        CASE_RETURN_STR(BTA_HH_GET_IDLE_EVT)
361        CASE_RETURN_STR(BTA_HH_SET_PROTO_EVT)
362        CASE_RETURN_STR(BTA_HH_SET_RPT_EVT)
363        CASE_RETURN_STR(BTA_HH_SET_IDLE_EVT)
364        CASE_RETURN_STR(BTA_HH_VC_UNPLUG_EVT)
365        CASE_RETURN_STR(BTA_HH_ADD_DEV_EVT)
366        CASE_RETURN_STR(BTA_HH_RMV_DEV_EVT)
367        CASE_RETURN_STR(BTA_HH_API_ERR_EVT)
368        default:
369            return "UNKNOWN MSG ID";
370     }
371}
372
373const char* dump_hf_conn_state(uint16_t event)
374{
375    switch(event)
376    {
377        CASE_RETURN_STR(BTHF_CONNECTION_STATE_DISCONNECTED)
378        CASE_RETURN_STR(BTHF_CONNECTION_STATE_CONNECTING)
379        CASE_RETURN_STR(BTHF_CONNECTION_STATE_CONNECTED)
380        CASE_RETURN_STR(BTHF_CONNECTION_STATE_SLC_CONNECTED)
381        CASE_RETURN_STR(BTHF_CONNECTION_STATE_DISCONNECTING)
382        default:
383            return "UNKNOWN MSG ID";
384    }
385}
386
387const char* dump_hf_call_state(bthf_call_state_t call_state)
388{
389    switch(call_state)
390    {
391        CASE_RETURN_STR(BTHF_CALL_STATE_IDLE)
392        CASE_RETURN_STR(BTHF_CALL_STATE_HELD)
393        CASE_RETURN_STR(BTHF_CALL_STATE_DIALING)
394        CASE_RETURN_STR(BTHF_CALL_STATE_ALERTING)
395        CASE_RETURN_STR(BTHF_CALL_STATE_INCOMING)
396        CASE_RETURN_STR(BTHF_CALL_STATE_WAITING)
397        CASE_RETURN_STR(BTHF_CALL_STATE_ACTIVE)
398        default:
399            return "UNKNOWN CALL STATE";
400    }
401}
402
403const char* dump_thread_evt(bt_cb_thread_evt evt)
404{
405    switch(evt)
406    {
407        CASE_RETURN_STR(ASSOCIATE_JVM)
408        CASE_RETURN_STR(DISASSOCIATE_JVM)
409
410        default:
411            return "unknown thread evt";
412    }
413}
414
415const char* dump_hf_audio_state(uint16_t event)
416{
417    switch(event)
418    {
419        CASE_RETURN_STR(BTHF_AUDIO_STATE_DISCONNECTED)
420        CASE_RETURN_STR(BTHF_AUDIO_STATE_CONNECTING)
421        CASE_RETURN_STR(BTHF_AUDIO_STATE_CONNECTED)
422        CASE_RETURN_STR(BTHF_AUDIO_STATE_DISCONNECTING)
423        default:
424           return "UNKNOWN MSG ID";
425
426    }
427}
428
429const char* dump_av_conn_state(uint16_t event)
430{
431    switch(event)
432    {
433        CASE_RETURN_STR(BTAV_CONNECTION_STATE_DISCONNECTED)
434        CASE_RETURN_STR(BTAV_CONNECTION_STATE_CONNECTING)
435        CASE_RETURN_STR(BTAV_CONNECTION_STATE_CONNECTED)
436        CASE_RETURN_STR(BTAV_CONNECTION_STATE_DISCONNECTING)
437        default:
438            return "UNKNOWN MSG ID";
439    }
440}
441
442const char* dump_av_audio_state(uint16_t event)
443{
444    switch(event)
445    {
446        CASE_RETURN_STR(BTAV_AUDIO_STATE_REMOTE_SUSPEND)
447        CASE_RETURN_STR(BTAV_AUDIO_STATE_STOPPED)
448        CASE_RETURN_STR(BTAV_AUDIO_STATE_STARTED)
449        default:
450            return "UNKNOWN MSG ID";
451    }
452}
453
454const char* dump_adapter_scan_mode(bt_scan_mode_t mode)
455{
456    switch(mode)
457    {
458        CASE_RETURN_STR(BT_SCAN_MODE_NONE)
459        CASE_RETURN_STR(BT_SCAN_MODE_CONNECTABLE)
460        CASE_RETURN_STR(BT_SCAN_MODE_CONNECTABLE_DISCOVERABLE)
461
462        default:
463            return "unknown scan mode";
464    }
465}
466
467const char* dump_bt_status(bt_status_t status)
468{
469    switch(status)
470    {
471        CASE_RETURN_STR(BT_STATUS_SUCCESS)
472        CASE_RETURN_STR(BT_STATUS_FAIL)
473        CASE_RETURN_STR(BT_STATUS_NOT_READY)
474        CASE_RETURN_STR(BT_STATUS_NOMEM)
475        CASE_RETURN_STR(BT_STATUS_BUSY)
476        CASE_RETURN_STR(BT_STATUS_UNSUPPORTED)
477
478        default:
479            return "unknown scan mode";
480    }
481}
482
483const char *dump_rc_event(uint8_t event)
484{
485   switch(event) {
486        CASE_RETURN_STR(BTA_AV_RC_OPEN_EVT)
487        CASE_RETURN_STR(BTA_AV_RC_CLOSE_EVT)
488        CASE_RETURN_STR(BTA_AV_REMOTE_CMD_EVT)
489        CASE_RETURN_STR(BTA_AV_REMOTE_RSP_EVT)
490        CASE_RETURN_STR(BTA_AV_VENDOR_CMD_EVT)
491        CASE_RETURN_STR(BTA_AV_VENDOR_RSP_EVT)
492        CASE_RETURN_STR(BTA_AV_META_MSG_EVT)
493        CASE_RETURN_STR(BTA_AV_RC_FEAT_EVT)
494        default:
495            return "UNKNOWN_EVENT";
496   }
497}
498
499const char * dump_rc_notification_event_id(uint8_t event_id)
500{
501    switch(event_id)
502    {
503        CASE_RETURN_STR(AVRC_EVT_PLAY_STATUS_CHANGE)
504        CASE_RETURN_STR(AVRC_EVT_TRACK_CHANGE)
505        CASE_RETURN_STR(AVRC_EVT_TRACK_REACHED_END)
506        CASE_RETURN_STR(AVRC_EVT_TRACK_REACHED_START)
507        CASE_RETURN_STR(AVRC_EVT_PLAY_POS_CHANGED)
508        CASE_RETURN_STR(AVRC_EVT_BATTERY_STATUS_CHANGE)
509        CASE_RETURN_STR(AVRC_EVT_SYSTEM_STATUS_CHANGE)
510        CASE_RETURN_STR(AVRC_EVT_APP_SETTING_CHANGE)
511        CASE_RETURN_STR(AVRC_EVT_VOLUME_CHANGE)
512
513        default:
514            return "Unhandled Event ID";
515    }
516}
517
518const char*  dump_rc_pdu(uint8_t pdu)
519{
520    switch(pdu)
521    {
522        CASE_RETURN_STR(AVRC_PDU_LIST_PLAYER_APP_ATTR)
523        CASE_RETURN_STR(AVRC_PDU_LIST_PLAYER_APP_VALUES)
524        CASE_RETURN_STR(AVRC_PDU_GET_CUR_PLAYER_APP_VALUE)
525        CASE_RETURN_STR(AVRC_PDU_SET_PLAYER_APP_VALUE)
526        CASE_RETURN_STR(AVRC_PDU_GET_PLAYER_APP_ATTR_TEXT)
527        CASE_RETURN_STR(AVRC_PDU_GET_PLAYER_APP_VALUE_TEXT)
528        CASE_RETURN_STR(AVRC_PDU_INFORM_DISPLAY_CHARSET)
529        CASE_RETURN_STR(AVRC_PDU_INFORM_BATTERY_STAT_OF_CT)
530        CASE_RETURN_STR(AVRC_PDU_GET_ELEMENT_ATTR)
531        CASE_RETURN_STR(AVRC_PDU_GET_PLAY_STATUS)
532        CASE_RETURN_STR(AVRC_PDU_REGISTER_NOTIFICATION)
533        CASE_RETURN_STR(AVRC_PDU_REQUEST_CONTINUATION_RSP)
534        CASE_RETURN_STR(AVRC_PDU_ABORT_CONTINUATION_RSP)
535        CASE_RETURN_STR(AVRC_PDU_SET_ABSOLUTE_VOLUME)
536        CASE_RETURN_STR(AVRC_PDU_SET_ADDRESSED_PLAYER)
537        CASE_RETURN_STR(AVRC_PDU_CHANGE_PATH)
538        CASE_RETURN_STR(AVRC_PDU_GET_CAPABILITIES)
539        default:
540            return "Unknown PDU";
541    }
542}
543