summaryrefslogtreecommitdiffstats
path: root/hal-interface.c
blob: 9753b091e8417c076c19c06f9031d1ba6a858b1b (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
/*
 * 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.
 *
 * reference:
 *   amixer contents; amixer controls;
 *   http://www.tldp.org/HOWTO/Alsa-sound-6.html
 */
#define _GNU_SOURCE  // needed for vasprintf
#include <string.h>
#include "hal-interface.h"
#include <systemd/sd-event.h>

alsaHalSndCardT *halSndCard;


// Force specific HAL to depend on ShareHalLib
PUBLIC char* SharedHalLibVersion = "1.0";


STATIC void pingtest(struct afb_req request) {
    json_object *query = afb_req_json(request);
    afb_req_success(request, query, NULL);
}

// Subscribe to AudioBinding events

STATIC void halSubscribe(afb_req request) {
    const char *devidJ = afb_req_value(request, "devid");
    if (devidJ == NULL) {
        afb_req_fail_f(request, "devidJ-missing", "devidJ=hw:xxx missing");
    }
}

// Map HAL ctlName to ctlLabel

STATIC int halCtlStringToIndex(const char* label) {
    alsaHalMapT *halCtls = halSndCard->ctls;

    for (int idx = 0; halCtls[idx].tag != EndHalCrlTag; idx++) {
        if (halCtls[idx].label && !strcasecmp(halCtls[idx].label, label)) return idx;
    }

    // not found
    return -1;
}

STATIC int halCtlTagToIndex(halCtlsTagT tag) {
    alsaHalMapT *halCtls = halSndCard->ctls;

    for (int idx = 0; halCtls[idx].tag != EndHalCrlTag; idx++) {
        if (halCtls[idx].tag == tag) return idx;
    }

    // not found
    return -1;
}


// Return ALL HAL snd controls

PUBLIC void halListCtls(afb_req request) {
    alsaHalMapT *halCtls = halSndCard->ctls;
    json_object *ctlsHalJ = json_object_new_array();

    for (int idx = 0; halCtls[idx].ctl.numid; idx++) {
        json_object *ctlHalJ = json_object_new_object();

        if (halCtls[idx].label) json_object_object_add(ctlHalJ, "label", json_object_new_string(halCtls[idx].label));
        else json_object_object_add(ctlHalJ, "label", json_object_new_string("HAL Label Not Set "));
        json_object_object_add(ctlHalJ, "tag", json_object_new_int(halCtls[idx].tag));
        json_object_object_add(ctlHalJ, "count", json_object_new_int(halCtls[idx].ctl.count));

        json_object_array_add(ctlsHalJ, ctlHalJ);
    }

    afb_req_success(request, ctlsHalJ, NULL);
}

STATIC int halGetCtlIndex(afb_req request, json_object*ctlInJ) {
    json_object *tmpJ;
    int tag, index, done;

    // check 1st short command mode [tag1, tag2, ...]
    enum json_type jtype = json_object_get_type(ctlInJ);
    switch (jtype) {
        case json_type_array:
            tmpJ = json_object_array_get_idx(ctlInJ, 0);
            tag = json_object_get_int(tmpJ);
            index = halCtlTagToIndex(tag);
            break;

        case json_type_int:
            tag = json_object_get_int(ctlInJ);
            index = halCtlTagToIndex(tag);
            break;

        case json_type_object:
            done = json_object_object_get_ex(ctlInJ, "tag", &tmpJ);
            if (done) {
                tag = json_object_get_int(tmpJ);
                index = halCtlTagToIndex(tag);
            } else {
                const char *label;
                done = json_object_object_get_ex(ctlInJ, "label", &tmpJ);
                if (!done) goto OnErrorExit;
                label = json_object_get_string(tmpJ);
                index = halCtlStringToIndex(label);
            }
            break;

        default:
            goto OnErrorExit;
    }

    if (index < 0) goto OnErrorExit;

    // return corresponding lowlevel numid to querylist
    return index;

OnErrorExit:
    afb_req_fail_f(request, "ctl-invalid", "No Label/Tag given ctl='%s'", json_object_get_string(ctlInJ));
    return -1;
}

STATIC int halCallAlsaSetCtls(json_object *ctlsOutJ) {
    json_object *responseJ, *queryJ;
    int err;

    // Call now level CTL
    queryJ = json_object_new_object();
    json_object_object_add(queryJ, "devid", json_object_new_string(halSndCard->devid));
    json_object_object_add(queryJ, "ctl", ctlsOutJ);

    err = afb_service_call_sync("alsacore", "ctlset", queryJ, &responseJ);
    json_object_put(responseJ); // let's ignore response

    return err;
}


// retrieve a single HAL control from its tag.

PUBLIC int halSetCtlByTag(halRampEnumT tag, int value) {
    json_object *ctlJ = json_object_new_array();
    alsaHalMapT *halCtls = halSndCard->ctls;
    int err, index;

    index = halCtlTagToIndex(tag);
    if (index < 0) goto OnErrorExit;

    json_object_array_add(ctlJ, json_object_new_int(halCtls[index].ctl.numid));
    json_object_array_add(ctlJ, volumeNormalise(ACTION_SET, &halCtls[index].ctl, json_object_new_int(value)));

    err = halCallAlsaSetCtls(ctlJ);

    return err;

OnErrorExit:
    return -1;
}


// Translate high level control to low level and call lower layer

PUBLIC void halSetCtls(afb_req request) {
    alsaHalMapT *halCtls = halSndCard->ctls;
    int err, done, index;
    json_object *ctlsInJ, *ctlsOutJ, *valuesJ;

    // get query from request
    ctlsInJ = afb_req_json(request);

    switch (json_object_get_type(ctlsInJ)) {
        case json_type_object:
        {
            ctlsOutJ = json_object_new_object();

            // control is in literal form {tag=xxx, label=xxx, value=xxxx}
            index = halGetCtlIndex(request, ctlsInJ);
            if (index < 0) goto OnErrorExit;

            done = json_object_object_get_ex(ctlsInJ, "val", &valuesJ);
            if (!done) {
                afb_req_fail_f(request, "ctl-invalid", "No val=[val1, ...] ctl='%s'", json_object_get_string(ctlsInJ));
                goto OnErrorExit;
            }

            json_object_object_add(ctlsOutJ, "id", json_object_new_int(halCtls[index].ctl.numid));
            json_object_object_add(ctlsOutJ, "val", volumeNormalise(ACTION_SET, &halCtls[index].ctl, valuesJ));
            break;
        }

        case json_type_array:
        {
            ctlsOutJ = json_object_new_array();

            for (int idx = 0; idx < json_object_array_length(ctlsInJ); idx++) {
                json_object *ctlInJ = json_object_array_get_idx(ctlsInJ, idx);
                index = halGetCtlIndex(request, ctlInJ);
                if (index < 0) goto OnErrorExit;

                done = json_object_object_get_ex(ctlInJ, "val", &valuesJ);
                if (!done) {
                    afb_req_fail_f(request, "ctl-invalid", "No val=[val1, ...] ctl='%s'", json_object_get_string(ctlsInJ));
                    goto OnErrorExit;
                }
                // let's create alsa low level set control request
                json_object *ctlOutJ = json_object_new_object();
                json_object_object_add(ctlOutJ, "id", json_object_new_int(halCtls[index].ctl.numid));
                json_object_object_add(ctlOutJ, "val", volumeNormalise(ACTION_SET, &halCtls[index].ctl, valuesJ));

                json_object_array_add(ctlsOutJ, ctlOutJ);
            }
            break;
        }

        default:
            afb_req_fail_f(request, "ctl-invalid", "Not a valid JSON ctl='%s'", json_object_get_string(ctlsInJ));
            goto OnErrorExit;
    }

    err = halCallAlsaSetCtls(ctlsOutJ);
    if (err) {
        afb_req_fail_f(request, "subcall:alsacore/setctl", "%s", json_object_get_string(ctlsOutJ));
        goto OnErrorExit;
    }

    afb_req_success(request, NULL, NULL);
    return;

OnErrorExit:
    return;
};

// Remap low level controls into HAL hight level ones

STATIC json_object *HalGetPrepareResponse(afb_req request, json_object *ctlsJ) {
    alsaHalMapT *halCtls = halSndCard->ctls;
    json_object *halResponseJ;
    int length;

    switch (json_object_get_type(ctlsJ)) {
        case json_type_array:
            // responseJ is a JSON array
            halResponseJ = json_object_new_array();
            length = json_object_array_length(ctlsJ);
            break;
        case json_type_object:
            halResponseJ = NULL;
            length = 1;
            break;
        default:
            afb_req_fail_f(request, "ctls-notarray", "Invalid Controls return from alsa/getcontrol ctlsJ=%s", json_object_get_string(ctlsJ));
            goto OnErrorExit;
    }

    // loop on array and store values into client context
    for (int idx = 0; idx < length; idx++) {
        json_object *sndCtlJ, *valJ, *numidJ;
        int numid;

        // extract control from array if any
        if (halResponseJ) sndCtlJ = json_object_array_get_idx(ctlsJ, idx);
        else sndCtlJ = ctlsJ;

        if (!json_object_object_get_ex(sndCtlJ, "id", &numidJ) || !json_object_object_get_ex(sndCtlJ, "val", &valJ)) {
            afb_req_fail_f(request, "ctl-invalid", "Invalid Control return from alsa/getcontrol ctl=%s", json_object_get_string(sndCtlJ));
            goto OnErrorExit;
        }

        // HAL and Business logic use the same AlsaMixerHal.h direct conversion
        numid = (halCtlsTagT) json_object_get_int(numidJ);

        for (int idx = 0; halCtls[idx].ctl.numid; idx++) {
            if (halCtls[idx].ctl.numid == numid) {
                // translate low level numid to HAL one and normalise values
                json_object *halCtlJ = json_object_new_object();
                json_object_object_add(halCtlJ, "label", json_object_new_string(halCtls[idx].label)); // idx+1 == HAL/NUMID
                json_object_object_add(halCtlJ, "tag", json_object_new_int(halCtls[idx].tag)); // idx+1 == HAL/NUMID
                json_object_object_add(halCtlJ, "val", volumeNormalise(ACTION_GET, &halCtls[idx].ctl, valJ));

                if (halResponseJ) json_object_array_add(halResponseJ, halCtlJ);
                else halResponseJ = halCtlJ;

                break;
            }
        }
        if (halCtls[idx].ctl.numid == 0) {
            afb_req_fail_f(request, "ctl-invalid", "Invalid Control numid=%d from alsa/getcontrol ctlJ=%s", numid, json_object_get_string(sndCtlJ));
            goto OnErrorExit;
        }
    }
    return halResponseJ;

OnErrorExit:
    return NULL;
}

STATIC json_object *halCallAlsaGetCtls(json_object *ctlsOutJ) {
    json_object *responseJ, *queryJ;
    int err, done;

    // Call now level CTL
    queryJ = json_object_new_object();
    json_object_object_add(queryJ, "devid", json_object_new_string(halSndCard->devid));
    json_object_object_add(queryJ, "ctl", ctlsOutJ);

    err = afb_service_call_sync("alsacore", "ctlget", queryJ, &responseJ);
    if (err) goto OnErrorExit;

    // Let ignore info data if any and keep on response
    done = json_object_object_get_ex(responseJ, "response", &responseJ);
    if (!done) goto OnErrorExit;

    return responseJ;

OnErrorExit:
    return NULL;
}

// retrieve a single HAL control from its tag.

PUBLIC json_object *halGetCtlByTag(halRampEnumT tag) {
    json_object *responseJ, *valJ;
    alsaHalMapT *halCtls = halSndCard->ctls;
    int done, index;

    index = halCtlTagToIndex(tag);
    if (index < 0) goto OnErrorExit;
    responseJ = halCallAlsaGetCtls(json_object_new_int(halCtls[index].ctl.numid));

    done = json_object_object_get_ex(responseJ, "val", &valJ);
    if (!done) goto OnErrorExit;

    return volumeNormalise(ACTION_GET, &halCtls[index].ctl, valJ);

OnErrorExit:
    return NULL;
}


// Translate high level control to low level and call lower layer

PUBLIC void halGetCtls(afb_req request) {
    int index;
    alsaHalMapT *halCtls = halSndCard->ctls;
    json_object *ctlsInJ, *ctlsOutJ, *responseJ;

    // get query from request
    ctlsInJ = afb_req_json(request);
    ctlsOutJ = json_object_new_array();

    switch (json_object_get_type(ctlsInJ)) {
        case json_type_object:
        {

            index = halGetCtlIndex(request, ctlsInJ);
            if (index < 0) goto OnErrorExit;
            json_object_array_add(ctlsOutJ, json_object_new_int(halCtls[index].ctl.numid));
            break;
        }

        case json_type_array:
        {

            for (int idx = 0; idx < json_object_array_length(ctlsInJ); idx++) {
                json_object *ctlInJ = json_object_array_get_idx(ctlsInJ, idx);
                index = halGetCtlIndex(request, ctlInJ);
                if (index < 0) goto OnErrorExit;
                json_object_array_add(ctlsOutJ, json_object_new_int(halCtls[index].ctl.numid));
            }
            break;
        }

        default:
            afb_req_fail_f(request, "ctl-invalid", "Not a valid JSON ctl='%s'", json_object_get_string(ctlsInJ));
            goto OnErrorExit;
    }

    // Call now level CTL
    responseJ = halCallAlsaGetCtls(ctlsOutJ);
    if (!responseJ) {
        afb_req_fail_f(request, "subcall:alsacore/getctl", "%s", json_object_get_string(responseJ));
        goto OnErrorExit;
    }

    // map back low level response to HAL ctl with normalised values
    json_object *halResponse = HalGetPrepareResponse(request, responseJ);
    if (!halResponse) goto OnErrorExit;

    afb_req_success(request, halResponse, NULL);
    return;

OnErrorExit:
    return;
};

STATIC int UpdateOneSndCtl(alsaHalCtlMapT *ctl, json_object *sndCtlJ) {
    json_object *tmpJ, *ctlJ;

    json_object_object_get_ex(sndCtlJ, "name", &tmpJ);
    ctl->name = (char*) strdup(json_object_get_string(tmpJ));

    json_object_object_get_ex(sndCtlJ, "id", &tmpJ);
    ctl->numid = json_object_get_int(tmpJ);

    // make sure we face a valid Alsa Low level ctl
    if (!json_object_object_get_ex(sndCtlJ, "ctl", &ctlJ)) goto OnErrorExit;

    json_object_object_get_ex(ctlJ, "min", &tmpJ);
    ctl->minval = json_object_get_int(tmpJ);

    json_object_object_get_ex(ctlJ, "max", &tmpJ);
    ctl->maxval = json_object_get_int(tmpJ);

    json_object_object_get_ex(ctlJ, "step", &tmpJ);
    ctl->step = json_object_get_int(tmpJ);

    json_object_object_get_ex(ctlJ, "count", &tmpJ);
    ctl->count = json_object_get_int(tmpJ);

    json_object_object_get_ex(ctlJ, "type", &tmpJ);
    ctl->type = (snd_ctl_elem_type_t) json_object_get_int(tmpJ);

    // process dbscale TLV if any
    if (json_object_object_get_ex(sndCtlJ, "tlv", &tmpJ)) {
        json_object *dbscaleJ;

        if (!json_object_object_get_ex(tmpJ, "dbscale", &dbscaleJ)) {
            AFB_INFO("TLV found but no DBscale attached ctl name=%s numid=%d", ctl->name, ctl->numid);
        } else {
            ctl->dbscale = malloc(sizeof (alsaHalDBscaleT));

            json_object_object_get_ex(dbscaleJ, "min", &tmpJ);
            ctl->dbscale->min = (snd_ctl_elem_type_t) json_object_get_int(tmpJ);

            json_object_object_get_ex(dbscaleJ, "max", &tmpJ);
            ctl->dbscale->max = (snd_ctl_elem_type_t) json_object_get_int(tmpJ);

            json_object_object_get_ex(dbscaleJ, "step", &tmpJ);
            ctl->dbscale->step = (snd_ctl_elem_type_t) json_object_get_int(tmpJ);

            json_object_object_get_ex(dbscaleJ, "mute", &tmpJ);
            ctl->dbscale->mute = (snd_ctl_elem_type_t) json_object_get_int(tmpJ);
        }
    }

    return 0;

OnErrorExit:
    return -1;
}

// this is call when after all bindings are loaded

PUBLIC int halServiceInit(const char *apiPrefix, alsaHalSndCardT *alsaHalSndCard) {
    int err;
    json_object *queryurl, *responseJ, *devidJ, *ctlsJ, *tmpJ;
    alsaHalMapT *halCtls = alsaHalSndCard->ctls;

    // if not volume normalisation CB provided use default one
    if (!alsaHalSndCard->volumeCB) alsaHalSndCard->volumeCB = volumeNormalise;
    halSndCard = alsaHalSndCard;

    err = afb_daemon_require_api("alsacore", 1);
    if (err) {
        AFB_ERROR("AlsaCore missing cannot use AlsaHAL");
        goto OnErrorExit;
    }

    // register HAL with Alsa Low Level Binder
    queryurl = json_object_new_object();
    json_object_object_add(queryurl, "prefix", json_object_new_string(apiPrefix));
    json_object_object_add(queryurl, "sndname", json_object_new_string(alsaHalSndCard->name));

    err = afb_service_call_sync("alsacore", "halregister", queryurl, &responseJ);
    if (err) {
        AFB_NOTICE("Fail to register HAL to ALSA lowlevel binding Response='%s'", json_object_get_string(responseJ));
    	json_object_put(responseJ);
        goto OnErrorExit;
    }

    // extract sound devidJ from HAL registration
    if (!json_object_object_get_ex(responseJ, "response", &tmpJ) || !json_object_object_get_ex(tmpJ, "devid", &devidJ)) {
        AFB_ERROR("Ooops: Internal error no devidJ return from HAL registration Response='%s'", json_object_get_string(responseJ));
    	json_object_put(responseJ);
        goto OnErrorExit;
    }

    // save devid for future use
    halSndCard->devid = strdup(json_object_get_string(devidJ));
    json_object_put(responseJ);

    // for each Non Alsa Control callback create a custom control
    ctlsJ = json_object_new_array();
    for (int idx = 0; (halCtls[idx].ctl.name || halCtls[idx].ctl.numid); idx++) {
        json_object *ctlJ;

        // Try to find best equivalent label for tag
        if (halCtls[idx].tag >StartHalCrlTag && halCtls[idx].tag < EndHalCrlTag && halCtlsLabels[halCtls[idx].tag] != NULL) {
            halCtls[idx].label = halCtlsLabels[halCtls[idx].tag];
        } else {
            if (halCtls[idx].ctl.name) halCtls[idx].label=halCtls[idx].ctl.name;
            else if (halCtls[idx].info) halCtls[idx].label=halCtls[idx].info;
            else  halCtls[idx].label="NoHalCttNameSet";
        }

        ctlJ = json_object_new_object();
        if (halCtls[idx].ctl.numid) json_object_object_add(ctlJ, "ctl", json_object_new_int(halCtls[idx].ctl.numid));
        if (halCtls[idx].ctl.name) json_object_object_add(ctlJ, "name", json_object_new_string(halCtls[idx].ctl.name));
        if (halCtls[idx].ctl.minval) json_object_object_add(ctlJ, "min", json_object_new_int(halCtls[idx].ctl.minval));
        if (halCtls[idx].ctl.maxval) json_object_object_add(ctlJ, "max", json_object_new_int(halCtls[idx].ctl.maxval));
        if (halCtls[idx].ctl.step) json_object_object_add(ctlJ, "step", json_object_new_int(halCtls[idx].ctl.step));
        if (halCtls[idx].ctl.type) json_object_object_add(ctlJ, "type", json_object_new_int(halCtls[idx].ctl.type));
        if (halCtls[idx].ctl.count) json_object_object_add(ctlJ, "count", json_object_new_int(halCtls[idx].ctl.count));
        if (halCtls[idx].ctl.value) json_object_object_add(ctlJ, "val", json_object_new_int(halCtls[idx].ctl.value));

        if (halCtls[idx].ctl.dbscale) {
            json_object *dbscaleJ = json_object_new_object();
            if (halCtls[idx].ctl.dbscale->max) json_object_object_add(dbscaleJ, "max", json_object_new_int(halCtls[idx].ctl.dbscale->max));
            if (halCtls[idx].ctl.dbscale->min) json_object_object_add(dbscaleJ, "min", json_object_new_int(halCtls[idx].ctl.dbscale->min));
            if (halCtls[idx].ctl.dbscale->step) json_object_object_add(dbscaleJ, "step", json_object_new_int(halCtls[idx].ctl.dbscale->step));
            if (halCtls[idx].ctl.dbscale->mute) json_object_object_add(dbscaleJ, "mute", json_object_new_int(halCtls[idx].ctl.dbscale->mute));
            json_object_object_add(ctlJ, "dbscale", dbscaleJ);
        }

        if (halCtls[idx].ctl.enums) {
            json_object *enumsJ = json_object_new_array();
            for (int jdx = 0; halCtls[idx].ctl.enums[jdx]; jdx++) {
                json_object_array_add(enumsJ, json_object_new_string(halCtls[idx].ctl.enums[jdx]));
            }
            json_object_object_add(ctlJ, "enums", enumsJ);
        }
        json_object_array_add(ctlsJ, ctlJ);
    }

    // Build new queryJ to add HAL custom control if any
    if (json_object_array_length(ctlsJ) > 0) {
        queryurl = json_object_new_object();
        json_object_object_add(queryurl, "devid", json_object_new_string(halSndCard->devid));
        json_object_object_add(queryurl, "ctl", ctlsJ);
        json_object_object_add(queryurl, "mode", json_object_new_int(QUERY_COMPACT));
        err = afb_service_call_sync("alsacore", "addcustomctl", queryurl, &responseJ);
        if (err) {
            AFB_ERROR("Fail creating HAL Custom ALSA ctls Response='%s'", json_object_get_string(responseJ));
            json_object_put(responseJ);
            goto OnErrorExit;
        }
    }

    // Make sure response is valid
    json_object_object_get_ex(responseJ, "response", &ctlsJ);
    if (json_object_get_type(ctlsJ) != json_type_array) {
        AFB_ERROR("Response Invalid JSON array ctls Response='%s'", json_object_get_string(responseJ));
        json_object_put(responseJ);
        goto OnErrorExit;
    }

    // update HAL data from JSON response
    for (int idx = 0; idx < json_object_array_length(ctlsJ); idx++) {
        json_object *ctlJ = json_object_array_get_idx(ctlsJ, idx);
        err = UpdateOneSndCtl(&halCtls[idx].ctl, ctlJ);
        if (err) {
            AFB_ERROR("Fail found MAP Alsa Low level=%s", json_object_get_string(ctlJ));
            json_object_put(responseJ);
            goto OnErrorExit;
        }
    }
    json_object_put(responseJ);

    // finally register for alsa lowlevel event
    queryurl = json_object_new_object();
    json_object_object_add(queryurl, "devid", json_object_new_string(halSndCard->devid));
    err = afb_service_call_sync("alsacore", "subscribe", queryurl, NULL);
    if (err) {
        AFB_ERROR("Fail subscribing to ALSA lowlevel events");
        goto OnErrorExit;
    }

    return (0);

OnErrorExit:
    return (1);
};


// This receive all event this binding subscribe to

PUBLIC void halServiceEvent(const char *evtname, json_object *eventJ) {
    int numid;
    alsaHalMapT *halCtls = halSndCard->ctls;
    json_object *numidJ, *valuesJ;

    AFB_DEBUG("halServiceEvent evtname=%s [msg=%s]", evtname, json_object_get_string(eventJ));

    json_object_object_get_ex(eventJ, "id", &numidJ);
    numid = json_object_get_int(numidJ);
    if (!numid) {
        AFB_ERROR("halServiceEvent noid: evtname=%s [msg=%s]", evtname, json_object_get_string(eventJ));
        return;
    }
    json_object_object_get_ex(eventJ, "val", &valuesJ);

    // search it corresponding numid in halCtls attach a callback
    if (numid) {
        for (int idx = 0; halCtls[idx].ctl.numid; idx++) {
            if (halCtls[idx].ctl.numid == numid && halCtls[idx].cb.callback != NULL) {
                halCtls[idx].cb.callback(halCtls[idx].tag, &halCtls[idx].ctl, halCtls[idx].cb.handle, valuesJ);
            }
        }
    }
}

// Every HAL export the same API & Interface Mapping from SndCard to AudioLogic is done through alsaHalSndCardT
PUBLIC afb_verb_v2 halServiceApi[] = {
    /* VERB'S NAME         FUNCTION TO CALL         SHORT DESCRIPTION */
    { .verb = "ping", .callback = pingtest, .info = "ping test for API"},
    { .verb = "ctllist", .callback = halListCtls, .info = "List AGL normalised Sound Controls"},
    { .verb = "ctlget", .callback = halGetCtls, .info = "Get one/many sound controls"},
    { .verb = "ctlset", .callback = halSetCtls, .info = "Set one/many sound controls"},
    { .verb = "evtsub", .callback = halSubscribe, .info = "Subscribe to HAL events"},
    { .verb = NULL} /* marker for end of the array */
};