aboutsummaryrefslogtreecommitdiffstats
path: root/ucs2-afb/ucs_binding.c
blob: b8a1ba89de2db299a6fcc426a970b20e436d4580 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
/*
 * Copyright (C) 2016 "IoT.bzh"
 * Author Fulup Ar Foll <fulup@iot.bzh>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * references:
 *   https://gist.github.com/ghedo/963382
 *   http://alsa-utils.sourcearchive.com/documentation/1.0.15/aplay_8c-source.html
 */

#define _GNU_SOURCE

#define BUFFER_FRAME_COUNT 10 /* max frames in buffer */
#define WAIT_TIMER_US 1000000 /* default waiting timer 1s */
#define I2C_MAX_DATA_SZ    32 /* max. number of bytes to be written to i2c */

#include <systemd/sd-event.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <assert.h>
#include <errno.h>
#include <dirent.h>

#include "ucs_binding.h"
#include "ucs_interface.h"

#define MAX_FILENAME_LEN (100)
#define RX_BUFFER (64)
#define XML_CONFIG_FOLDER "/data/"
#define XML_CONFIG_FILE "config_multichannel_audio_kit.xml"

/** Internal structure, enabling multiple instances of this component.
 * \note Do not access any of this variables.
 *  */
typedef struct {
    int fileHandle;
    int fileFlags;
    char fileName[MAX_FILENAME_LEN];
    uint8_t rxBuffer[RX_BUFFER];
    uint32_t rxLen;
} CdevData_t;


typedef struct {
  CdevData_t rx;
  CdevData_t tx;
  UCSI_Data_t ucsiData;
  UcsXmlVal_t* ucsConfig;
} ucsContextT;

typedef struct {
    struct afb_event node_event;

} EventData_t;

static ucsContextT *ucsContextS = NULL;
static EventData_t *eventData = NULL;

PUBLIC void UcsXml_CB_OnError(const char format[], uint16_t vargsCnt, ...) {
    /*AFB_DEBUG (afbIface, format, args); */
    va_list args;
    va_start (args, vargsCnt);
    vfprintf (stderr, format, args);
    va_end(args);

    va_list argptr;
    char outbuf[300];
    va_start(argptr, vargsCnt);
    vsprintf(outbuf, format, argptr);
    va_end(argptr);
    AFB_WARNING ("%s", outbuf);
}

PUBLIC uint16_t UCSI_CB_OnGetTime(void *pTag) {
    struct timespec currentTime;
    uint16_t timer;
    pTag = pTag;

    if (clock_gettime(CLOCK_MONOTONIC_RAW, &currentTime))   {
        assert(false);
        return 0;
    }

    timer = (uint16_t) ((currentTime.tv_sec * 1000 ) + ( currentTime.tv_nsec / 1000000 ));
    return(timer);
}

STATIC int onTimerCB (sd_event_source* source,uint64_t timer, void* pTag) {
    ucsContextT *ucsContext = (ucsContextT*) pTag;

    sd_event_source_unref(source);
    UCSI_Timeout(&ucsContext->ucsiData);

    return 0;
}

void UCSI_CB_OnNetworkState(void *pTag, bool isAvailable, uint16_t packetBandwidth, uint8_t amountOfNodes)
{
    AFB_NOTICE ("Network is available=%d, bw=%d, nodeCnt=%d", isAvailable, packetBandwidth, amountOfNodes);
}

/* UCS2 Interface Timer Callback */
PUBLIC void UCSI_CB_OnSetServiceTimer(void *pTag, uint16_t timeout) {
  uint64_t usec;
  /* set a timer with  250ms accuracy */
  sd_event_now(afb_daemon_get_event_loop(), CLOCK_BOOTTIME, &usec);
  sd_event_add_time(afb_daemon_get_event_loop(), NULL, CLOCK_MONOTONIC, usec + (timeout*1000), 250, onTimerCB, pTag);

}

/**
 * \brief Callback when ever an Unicens forms a human readable message.
 *        This can be error events or when enabled also debug messages.
 * \note This function must be implemented by the integrator
 * \param pTag - Pointer given by the integrator by UCSI_Init
 * \param format - Zero terminated format string (following printf rules)
 * \param vargsCnt - Amount of parameters stored in "..."
 */
void UCSI_CB_OnUserMessage(void *pTag, bool isError, const char format[],
    uint16_t vargsCnt, ...) {
    va_list argptr;
    char outbuf[300];
    pTag = pTag;
    va_start(argptr, vargsCnt);
    vsprintf(outbuf, format, argptr);
    va_end(argptr);
    AFB_NOTICE ("%s",outbuf);
}

/** UCSI_Service cannot be called directly within UNICENS context, need to service stack through mainloop */
STATIC int OnServiceRequiredCB (sd_event_source *source, uint64_t usec, void *pTag) {
    ucsContextT *ucsContext = (ucsContextT*) pTag;

    sd_event_source_unref(source);
    UCSI_Service(&ucsContext->ucsiData);
    return (0);
}

/* UCS Callback fire when ever UNICENS needs to be serviced */
PUBLIC void UCSI_CB_OnServiceRequired(void *pTag) {

   /* push an asynchronous request for loopback to call UCSI_Service */
   sd_event_add_time(afb_daemon_get_event_loop(), NULL, CLOCK_MONOTONIC, 0, 0, OnServiceRequiredCB, pTag);
}

/* Callback when ever this UNICENS wants to send a message to INIC. */
PUBLIC void UCSI_CB_OnTxRequest(void *pTag, const uint8_t *pData, uint32_t len) {
    ucsContextT *ucsContext = (ucsContextT*) pTag;
    CdevData_t *cdevTx = &ucsContext->tx;
    uint32_t total = 0;

    if (NULL == pData || 0 == len) return;

    if (O_RDONLY == cdevTx->fileFlags) return;
    if (-1 == cdevTx->fileHandle)
        cdevTx->fileHandle = open(cdevTx->fileName, cdevTx->fileFlags);
    if (-1 == cdevTx->fileHandle)
        return;

    while(total < len) {
        ssize_t written = write(cdevTx->fileHandle, &pData[total], (len - total));
        if (0 >= written)
        {
            /* Silently ignore write error (only occur in non-blocking mode) */
            break;
        }
        total += (uint32_t) written;
    }
}

/** UcsXml_FreeVal be called directly within UNICENS context, need to service stack through mainloop */
STATIC int OnStopCB (sd_event_source *source, uint64_t usec, void *pTag) {
    if (NULL != ucsContextS && NULL != ucsContextS->ucsConfig) {
        UcsXml_FreeVal(ucsContextS->ucsConfig);
        ucsContextS->ucsConfig = NULL;
    }
}

/**
 * \brief Callback when UNICENS instance has been stopped.
 * \note This event can be used to free memory holding the resources
 *       passed with UCSI_NewConfig
 * \note This function must be implemented by the integrator
 * \param pTag - Pointer given by the integrator by UCSI_Init
 */
void UCSI_CB_OnStop(void *pTag) {
   AFB_NOTICE ("UNICENS stopped");
   /* push an asynchronous request for loopback to call UcsXml_FreeVal */
   sd_event_add_time(afb_daemon_get_event_loop(), NULL, CLOCK_MONOTONIC, 0, 0, OnStopCB, pTag);
}

/** This callback will be raised, when ever an applicative message on the control channel arrived */
void UCSI_CB_OnAmsMessageReceived(void *pTag)
{
	/* If not interested, just ignore this event.
	   Otherwise UCSI_GetAmsMessage may now be called asynchronous (mainloop) to get the content.
	   Don't forget to call UCSI_ReleaseAmsMessage after that */
}

void UCSI_CB_OnRouteResult(void *pTag, uint16_t routeId, bool isActive, uint16_t connectionLabel)
{
    AFB_NOTICE ("Route 0x%X is active=%d, connection label=0x%X", routeId, isActive, connectionLabel);
}

void UCSI_CB_OnGpioStateChange(void *pTag, uint16_t nodeAddress, uint8_t gpioPinId, bool isHighState)
{
    AFB_NOTICE ("GPIO state of node 0x%X changed, pin=%d isHigh=%d", nodeAddress, gpioPinId, isHighState);
}

PUBLIC void UCSI_CB_OnMgrReport(void *pTag, Ucs_MgrReport_t code, uint16_t nodeAddress, Ucs_Rm_Node_t *pNode){

    bool available;

    if (code == UCS_MGR_REP_AVAILABLE) {
        available = true;
    }
    else if (code == UCS_MGR_REP_NOT_AVAILABLE) {
        available = false;
    }
    else {
        /*untracked event - just exit*/
        return;
    }

    if (eventData) {

        json_object *j_event_info = json_object_new_object();
        json_object_object_add(j_event_info, "node", json_object_new_int(nodeAddress));
        json_object_object_add(j_event_info, "available", json_object_new_boolean(available));

        afb_event_push(eventData->node_event, j_event_info);
    }
}

bool Cdev_Init(CdevData_t *d, const char *fileName, bool read, bool write)
{
    if (NULL == d || NULL == fileName)  goto OnErrorExit;

    memset(d, 0, sizeof(CdevData_t));
    strncpy(d->fileName, fileName, MAX_FILENAME_LEN);
    d->fileHandle = -1;

    if (read && write)
        d->fileFlags = O_RDWR | O_NONBLOCK;
    else if (read)
        d->fileFlags = O_RDONLY | O_NONBLOCK;
    else if (write)
        d->fileFlags = O_WRONLY | O_NONBLOCK;

    /* open file to enable event loop */
    d->fileHandle = open(d->fileName, d->fileFlags);
    if (d->fileHandle  <= 0) goto OnErrorExit;

    return true;

 OnErrorExit:
    return false;
}

static bool InitializeCdevs(ucsContextT *ucsContext)
{
    if(!Cdev_Init(&ucsContext->tx, CONTROL_CDEV_TX, false, true))
        return false;
    if(!Cdev_Init(&ucsContext->rx, CONTROL_CDEV_RX, true, false))
        return false;
    return true;
}

/* Callback fire when something is avaliable on MOST cdev */
int onReadCB (sd_event_source* src, int fileFd, uint32_t revents, void* pTag) {
    ucsContextT *ucsContext =( ucsContextT*) pTag;
    ssize_t len;
    uint8_t pBuffer[RX_BUFFER];
    int ok;

    len = read (ucsContext->rx.fileHandle, &pBuffer, sizeof(pBuffer));
    if (0 == len)
        return 0;
    ok= UCSI_ProcessRxData(&ucsContext->ucsiData, pBuffer, (uint16_t)len);
    if (!ok) {
        AFB_DEBUG ("Buffer overrun (not handle)");
        /* Buffer overrun could replay pBuffer */
    }
    return 0;
}


STATIC char* GetDefaultConfig(void) {

    char const *data_path = getenv("AFM_APP_INSTALL_DIR");

    if (!data_path) {
        AFB_ERROR("AFM_APP_INSTALL_DIR is not defined");
    }
    else {
        size_t size;
        char * config_path;

        AFB_NOTICE("AFM_APP_INSTALL_DIR is: %s", data_path);
        size = strlen(data_path) + strlen(XML_CONFIG_FOLDER) + strlen(XML_CONFIG_FILE) + 2;
        config_path = malloc(size);
        if (config_path != NULL) {
            snprintf(config_path, size, "%s%s%s", data_path, XML_CONFIG_FOLDER, XML_CONFIG_FILE);
            if(access(config_path, R_OK ) == 0) {
                AFB_NOTICE("Default configuration: %s", config_path);
                return config_path;
            }
        }
    }

    return NULL;
}

STATIC UcsXmlVal_t* ParseFile(const char *filename) {
    char *xmlBuffer;
    ssize_t readSize;
    int fdHandle ;
    struct stat fdStat;
    UcsXmlVal_t *ucsConfig = NULL;

    fdHandle = open(filename, O_RDONLY);
    if (fdHandle <= 0) {
        AFB_ERROR("File not accessible: '%s' err=%s", filename, strerror(fdHandle));
        goto OnErrorExit;
    }

    /* read file into buffer as a \0 terminated string */
    fstat(fdHandle, &fdStat);
    xmlBuffer = (char*)alloca(fdStat.st_size + 1);
    readSize = read(fdHandle, xmlBuffer, fdStat.st_size);
    close(fdHandle);
    xmlBuffer[readSize] = '\0'; /* In any case, terminate it. */

    if (readSize != fdStat.st_size)  {
        AFB_ERROR("File to read fullfile '%s' size(%d!=%d)", filename, (int)readSize, (int)fdStat.st_size);
        goto OnErrorExit;
    }

    ucsConfig = UcsXml_Parse(xmlBuffer);
    if (!ucsConfig)  {
        AFB_ERROR("File XML invalid: '%s'", filename);
        goto OnErrorExit;
    }
    AFB_NOTICE ("Parsing result: %d Nodes, %d Scripts, Ethernet Bandwith %d bytes = %.2f MBit/s", ucsConfig->nodSize, ucsConfig->routesSize, ucsConfig->packetBw, (48 * 8 * ucsConfig->packetBw / 1000.0));

    return (ucsConfig);

 OnErrorExit:
    return NULL;
}

PUBLIC int StartConfiguration(const char *filename) {
    static ucsContextT ucsContext = { 0 };

    sd_event_source *evtSource;
    int err;

    /* Read and parse XML file */
    ucsContext.ucsConfig = ParseFile(filename);
    if (NULL == ucsContext.ucsConfig) {
        AFB_ERROR ("Cannot access or load file: '%s'", filename);
        goto OnErrorExit;
    }

    /* When ucsContextS is set, do not initalize UNICENS, CDEVs or system hooks, just load new XML */
    if (!ucsContextS)
    {
        if (!ucsContextS && !InitializeCdevs(&ucsContext))  {
            AFB_ERROR ("Fail to initialise device [rx=%s tx=%s]", CONTROL_CDEV_RX, CONTROL_CDEV_TX);
            goto OnErrorExit;
        }

        /* Initialise UNICENS Config Data Structure */
        UCSI_Init(&ucsContext.ucsiData, &ucsContext);

        /* register aplayHandle file fd into binder mainloop */
        err = sd_event_add_io(afb_daemon_get_event_loop(), &evtSource, ucsContext.rx.fileHandle, EPOLLIN, onReadCB, &ucsContext);
        if (err < 0) {
            AFB_ERROR ("Cannot hook events to mainloop");
            goto OnErrorExit;
        }

        /* save this in a statical variable until ucs2vol move to C */
        ucsContextS = &ucsContext;
    }
    /* Initialise UNICENS with parsed config */
    if (!UCSI_NewConfig(&ucsContext.ucsiData, ucsContext.ucsConfig))   {
        AFB_ERROR ("Fail to initialize UNICENS");
        goto OnErrorExit;
    }

    return 0;

 OnErrorExit:
    return -1;
}

PUBLIC void ucs2_initialise (struct afb_req request) {
    const char *filename = afb_req_value(request, "filename");

    if (!filename) {
        afb_req_fail_f (request, "filename-missing", "No filename given");
        goto OnErrorExit;
    }

    if (StartConfiguration(filename) != 0) {
        afb_req_fail_f (request, "load-failed", "Cannot parse file and start UNICENS");
        goto OnErrorExit;
    }

    afb_req_success(request,NULL,"UNICENS-active");

 OnErrorExit:
    return;
}


// List Avaliable Configuration Files
PUBLIC void ucs2_listconfig (struct afb_req request) {
    struct json_object *queryJ, *tmpJ, *responseJ;
    DIR  *dirHandle;
    char *dirPath, *dirList;
    int error=0;

    queryJ = afb_req_json(request);
    if (queryJ && json_object_object_get_ex (queryJ, "cfgpath" , &tmpJ)) {
        dirList = strdup (json_object_get_string(tmpJ));
    } else {
        dirList = strdup (UCS2_CFG_PATH);
        AFB_NOTICE ("fgpath:missing uses UCS2_CFG_PATH=%s", UCS2_CFG_PATH);
    }

    responseJ = json_object_new_array();
    for (dirPath= strtok(dirList, ":"); dirPath && *dirPath; dirPath=strtok(NULL,":")) {
         struct dirent *dirEnt;

        dirHandle = opendir (dirPath);
        if (!dirHandle) {
            AFB_NOTICE ("ucs2_listconfig dir=%s not readable", dirPath);
            error++;
            continue;
        }

        AFB_NOTICE ("ucs2_listconfig scanning: %s", dirPath);
        while ((dirEnt = readdir(dirHandle)) != NULL) {
            // Unknown type is accepted to support dump filesystems
            if (dirEnt->d_type == DT_REG || dirEnt->d_type == DT_UNKNOWN) {
                struct json_object *pathJ = json_object_new_object();
                json_object_object_add(pathJ, "dirpath", json_object_new_string(dirPath));
                json_object_object_add(pathJ, "basename", json_object_new_string(dirEnt->d_name));
                json_object_array_add(responseJ, pathJ);
            }
        }
    }

    free (dirList);

    if (!error)  afb_req_success(request,responseJ,NULL);
    else {
        char info[40];
        snprintf (info, sizeof(info), "[%d] where not scanned", error);
         afb_req_success(request,responseJ, info);
    }

    return;
}

PUBLIC void ucs2_subscribe (struct afb_req request) {

    if (!eventData) {

        eventData = malloc(sizeof(EventData_t));
        if (eventData) {
            eventData->node_event = afb_daemon_make_event ("node-availibility");
        }

        if (!eventData || !afb_event_is_valid(eventData->node_event)) {
            afb_req_fail_f (request, "create-event", "Cannot create or register event");
            goto OnExitError;
        }
    }

    if (afb_req_subscribe(request, eventData->node_event) != 0) {

        afb_req_fail_f (request, "subscribe-event", "Cannot subscribe to event");
        goto OnExitError;
    }

    afb_req_success(request,NULL,"event subscription successful");

OnExitError:
    return;
}

STATIC void ucs2_writei2c_CB (void *result_ptr, void *request_ptr) {

    if (request_ptr){
        afb_req *req = (afb_req *)request_ptr;
        Ucs_I2c_ResultCode_t *res = (Ucs_I2c_ResultCode_t *)result_ptr;

        if (!res) {
            afb_req_fail(*req, "processing","busy or lost initialization");
        }
        else if (*res != UCS_I2C_RES_SUCCESS){
            afb_req_fail_f(*req, "error-result", "result code: %d", *res);
        }
        else {
            afb_req_success(*req, NULL, "success");
        }

        afb_req_unref(*req);
        free(request_ptr);
    }
    else {
        AFB_NOTICE("write_i2c: ambiguous response data");
    }
}

/* write a single i2c command */
STATIC void ucs2_writei2c_cmd(struct afb_req request, json_object *j_obj) {

    static uint8_t i2c_data[I2C_MAX_DATA_SZ];
    uint8_t i2c_data_sz = 0;
    uint16_t node_addr = 0;
    struct afb_req *async_req_ptr = NULL;

    node_addr = (uint16_t)json_object_get_int(json_object_object_get(j_obj, "node"));
    AFB_NOTICE("node_address: 0x%02X", node_addr);

    if (node_addr == 0) {
        afb_req_fail_f(request, "query-params","params wrong or missing");
        goto OnErrorExit;
    }

    if (json_object_get_type(json_object_object_get(j_obj, "data"))==json_type_array) {
        int size = json_object_array_length(json_object_object_get(j_obj, "data"));
        if ((size > 0) && (size <= I2C_MAX_DATA_SZ)) {

            int32_t i;
            int32_t val;
            struct json_object *j_elem;
            struct json_object *j_arr = json_object_object_get(j_obj, "data");

            for (i = 0; i < size; i++) {


                j_elem = json_object_array_get_idx(j_arr, i);
                val = json_object_get_int(j_elem);
                if ((val < 0) && (val > 0xFF)){
                    i = 0;
                    break;
                }
                i2c_data[i] = (uint8_t)json_object_get_int(j_elem);
            }

            i2c_data_sz = (uint8_t)i;
        }
    }

    if (i2c_data_sz == 0) {
        AFB_NOTICE("data: invalid or not found");
        afb_req_fail_f(request, "query-params","params wrong or missing");
        goto OnErrorExit;
    }

    async_req_ptr = malloc(sizeof(afb_req));
    *async_req_ptr = request;

    if (UCSI_I2CWrite(  &ucsContextS->ucsiData,   /* UCSI_Data_t *pPriv*/
                        node_addr,                /* uint16_t targetAddress*/
                        false,                    /* bool isBurst*/
                        0u,                       /* block count */
                        0x2Au,                    /* i2c slave address */
                        0x03E8u,                  /* timeout 1000 milliseconds */
                        i2c_data_sz,              /* uint8_t dataLen */
                        &i2c_data[0],             /* uint8_t *pData */
                        &ucs2_writei2c_CB,        /* callback*/
                        (void*)async_req_ptr      /* callback argument */
                  )) {
        /* asynchronous command is running */
        afb_req_addref(request);
    }
    else {
        AFB_NOTICE("i2c write: scheduling command failed");
        afb_req_fail_f(request, "query-command-queue","command queue overload");
        free(async_req_ptr);
        async_req_ptr = NULL;
        goto OnErrorExit;
    }

OnErrorExit:
    return;
}

/* parse array or single command */
PUBLIC void ucs2_writei2c (struct afb_req request) {

    struct json_object *j_obj;

    /* check UNICENS is initialised */
    if (!ucsContextS) {
        afb_req_fail_f(request, "unicens-init","Should Load Config before using setvol");
        goto OnErrorExit;
    }

    j_obj = afb_req_json(request);
    if (!j_obj) {
        afb_req_fail_f(request, "query-notjson","query=%s not a valid json entry", afb_req_value(request,""));
        goto OnErrorExit;
    };

    AFB_DEBUG("request: %s", json_object_to_json_string(j_obj));

    if (json_object_get_type(j_obj)==json_type_array) {

        int cnt;
        int len = json_object_array_length(j_obj);

        if (len != 1) {
            afb_req_fail_f(request, "query-array","query of multiple commands is not supported");
            goto OnErrorExit;
        }

        for (cnt = 0; cnt < len; cnt++) {

            json_object *j_cmd = json_object_array_get_idx(j_obj, cnt);
            ucs2_writei2c_cmd(request, j_cmd);
        }
    }
    else {
        ucs2_writei2c_cmd(request, j_obj);
    }

 OnErrorExit:
    return;
}

PUBLIC int ucs2_initbinding(void) {
#ifndef DISABLE_AUTOSTART
    char *filename = GetDefaultConfig();
    if (filename != NULL) {

        AFB_NOTICE("AUTO-LOAD configuration: %s", filename);
        if (StartConfiguration(filename) == 0) {
            AFB_NOTICE("AUTO-LOAD successful");
        } else {
            AFB_NOTICE("AUTO-LOAD failed");
        }
        free(filename);
    }
#endif
    return 0;
}