forked from grate-driver/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
dummy.c
1225 lines (1075 loc) · 32.1 KB
/
dummy.c
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
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* Dummy soundcard
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/jiffies.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/wait.h>
#include <linux/hrtimer.h>
#include <linux/math64.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/tlv.h>
#include <sound/pcm.h>
#include <sound/rawmidi.h>
#include <sound/info.h>
#include <sound/initval.h>
MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}");
#define MAX_PCM_DEVICES 4
#define MAX_PCM_SUBSTREAMS 128
#define MAX_MIDI_DEVICES 2
/* defaults */
#define MAX_BUFFER_SIZE (64*1024)
#define MIN_PERIOD_SIZE 64
#define MAX_PERIOD_SIZE MAX_BUFFER_SIZE
#define USE_FORMATS (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
#define USE_RATE SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
#define USE_RATE_MIN 5500
#define USE_RATE_MAX 48000
#define USE_CHANNELS_MIN 1
#define USE_CHANNELS_MAX 2
#define USE_PERIODS_MIN 1
#define USE_PERIODS_MAX 1024
static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
static char *model[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = NULL};
static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
//static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
#ifdef CONFIG_HIGH_RES_TIMERS
static bool hrtimer = 1;
#endif
static bool fake_buffer = 1;
module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
module_param_array(model, charp, NULL, 0444);
MODULE_PARM_DESC(model, "Soundcard model.");
module_param_array(pcm_devs, int, NULL, 0444);
MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
module_param_array(pcm_substreams, int, NULL, 0444);
MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-128) for dummy driver.");
//module_param_array(midi_devs, int, NULL, 0444);
//MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
module_param(fake_buffer, bool, 0444);
MODULE_PARM_DESC(fake_buffer, "Fake buffer allocations.");
#ifdef CONFIG_HIGH_RES_TIMERS
module_param(hrtimer, bool, 0644);
MODULE_PARM_DESC(hrtimer, "Use hrtimer as the timer source.");
#endif
static struct platform_device *devices[SNDRV_CARDS];
#define MIXER_ADDR_MASTER 0
#define MIXER_ADDR_LINE 1
#define MIXER_ADDR_MIC 2
#define MIXER_ADDR_SYNTH 3
#define MIXER_ADDR_CD 4
#define MIXER_ADDR_LAST 4
struct dummy_timer_ops {
int (*create)(struct snd_pcm_substream *);
void (*free)(struct snd_pcm_substream *);
int (*prepare)(struct snd_pcm_substream *);
int (*start)(struct snd_pcm_substream *);
int (*stop)(struct snd_pcm_substream *);
snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *);
};
#define get_dummy_ops(substream) \
(*(const struct dummy_timer_ops **)(substream)->runtime->private_data)
struct dummy_model {
const char *name;
int (*playback_constraints)(struct snd_pcm_runtime *runtime);
int (*capture_constraints)(struct snd_pcm_runtime *runtime);
u64 formats;
size_t buffer_bytes_max;
size_t period_bytes_min;
size_t period_bytes_max;
unsigned int periods_min;
unsigned int periods_max;
unsigned int rates;
unsigned int rate_min;
unsigned int rate_max;
unsigned int channels_min;
unsigned int channels_max;
};
struct snd_dummy {
struct snd_card *card;
struct dummy_model *model;
struct snd_pcm *pcm;
struct snd_pcm_hardware pcm_hw;
spinlock_t mixer_lock;
int mixer_volume[MIXER_ADDR_LAST+1][2];
int capture_source[MIXER_ADDR_LAST+1][2];
int iobox;
struct snd_kcontrol *cd_volume_ctl;
struct snd_kcontrol *cd_switch_ctl;
};
/*
* card models
*/
static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
{
int err;
err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
if (err < 0)
return err;
err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX);
if (err < 0)
return err;
return 0;
}
static struct dummy_model model_emu10k1 = {
.name = "emu10k1",
.playback_constraints = emu10k1_playback_constraints,
.buffer_bytes_max = 128 * 1024,
};
static struct dummy_model model_rme9652 = {
.name = "rme9652",
.buffer_bytes_max = 26 * 64 * 1024,
.formats = SNDRV_PCM_FMTBIT_S32_LE,
.channels_min = 26,
.channels_max = 26,
.periods_min = 2,
.periods_max = 2,
};
static struct dummy_model model_ice1712 = {
.name = "ice1712",
.buffer_bytes_max = 256 * 1024,
.formats = SNDRV_PCM_FMTBIT_S32_LE,
.channels_min = 10,
.channels_max = 10,
.periods_min = 1,
.periods_max = 1024,
};
static struct dummy_model model_uda1341 = {
.name = "uda1341",
.buffer_bytes_max = 16380,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.channels_min = 2,
.channels_max = 2,
.periods_min = 2,
.periods_max = 255,
};
static struct dummy_model model_ac97 = {
.name = "ac97",
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_48000,
.rate_min = 48000,
.rate_max = 48000,
};
static struct dummy_model model_ca0106 = {
.name = "ca0106",
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.buffer_bytes_max = ((65536-64)*8),
.period_bytes_max = (65536-64),
.periods_min = 2,
.periods_max = 8,
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000,
.rate_min = 48000,
.rate_max = 192000,
};
static struct dummy_model *dummy_models[] = {
&model_emu10k1,
&model_rme9652,
&model_ice1712,
&model_uda1341,
&model_ac97,
&model_ca0106,
NULL
};
/*
* system timer interface
*/
struct dummy_systimer_pcm {
/* ops must be the first item */
const struct dummy_timer_ops *timer_ops;
spinlock_t lock;
struct timer_list timer;
unsigned long base_time;
unsigned int frac_pos; /* fractional sample position (based HZ) */
unsigned int frac_period_rest;
unsigned int frac_buffer_size; /* buffer_size * HZ */
unsigned int frac_period_size; /* period_size * HZ */
unsigned int rate;
int elapsed;
struct snd_pcm_substream *substream;
};
static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm)
{
mod_timer(&dpcm->timer, jiffies +
(dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate);
}
static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
{
unsigned long delta;
delta = jiffies - dpcm->base_time;
if (!delta)
return;
dpcm->base_time += delta;
delta *= dpcm->rate;
dpcm->frac_pos += delta;
while (dpcm->frac_pos >= dpcm->frac_buffer_size)
dpcm->frac_pos -= dpcm->frac_buffer_size;
while (dpcm->frac_period_rest <= delta) {
dpcm->elapsed++;
dpcm->frac_period_rest += dpcm->frac_period_size;
}
dpcm->frac_period_rest -= delta;
}
static int dummy_systimer_start(struct snd_pcm_substream *substream)
{
struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
spin_lock(&dpcm->lock);
dpcm->base_time = jiffies;
dummy_systimer_rearm(dpcm);
spin_unlock(&dpcm->lock);
return 0;
}
static int dummy_systimer_stop(struct snd_pcm_substream *substream)
{
struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
spin_lock(&dpcm->lock);
del_timer(&dpcm->timer);
spin_unlock(&dpcm->lock);
return 0;
}
static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct dummy_systimer_pcm *dpcm = runtime->private_data;
dpcm->frac_pos = 0;
dpcm->rate = runtime->rate;
dpcm->frac_buffer_size = runtime->buffer_size * HZ;
dpcm->frac_period_size = runtime->period_size * HZ;
dpcm->frac_period_rest = dpcm->frac_period_size;
dpcm->elapsed = 0;
return 0;
}
static void dummy_systimer_callback(unsigned long data)
{
struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data;
unsigned long flags;
int elapsed = 0;
spin_lock_irqsave(&dpcm->lock, flags);
dummy_systimer_update(dpcm);
dummy_systimer_rearm(dpcm);
elapsed = dpcm->elapsed;
dpcm->elapsed = 0;
spin_unlock_irqrestore(&dpcm->lock, flags);
if (elapsed)
snd_pcm_period_elapsed(dpcm->substream);
}
static snd_pcm_uframes_t
dummy_systimer_pointer(struct snd_pcm_substream *substream)
{
struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
snd_pcm_uframes_t pos;
spin_lock(&dpcm->lock);
dummy_systimer_update(dpcm);
pos = dpcm->frac_pos / HZ;
spin_unlock(&dpcm->lock);
return pos;
}
static int dummy_systimer_create(struct snd_pcm_substream *substream)
{
struct dummy_systimer_pcm *dpcm;
dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
if (!dpcm)
return -ENOMEM;
substream->runtime->private_data = dpcm;
setup_timer(&dpcm->timer, dummy_systimer_callback,
(unsigned long) dpcm);
spin_lock_init(&dpcm->lock);
dpcm->substream = substream;
return 0;
}
static void dummy_systimer_free(struct snd_pcm_substream *substream)
{
kfree(substream->runtime->private_data);
}
static const struct dummy_timer_ops dummy_systimer_ops = {
.create = dummy_systimer_create,
.free = dummy_systimer_free,
.prepare = dummy_systimer_prepare,
.start = dummy_systimer_start,
.stop = dummy_systimer_stop,
.pointer = dummy_systimer_pointer,
};
#ifdef CONFIG_HIGH_RES_TIMERS
/*
* hrtimer interface
*/
struct dummy_hrtimer_pcm {
/* ops must be the first item */
const struct dummy_timer_ops *timer_ops;
ktime_t base_time;
ktime_t period_time;
atomic_t running;
struct hrtimer timer;
struct tasklet_struct tasklet;
struct snd_pcm_substream *substream;
};
static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
{
struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
if (atomic_read(&dpcm->running))
snd_pcm_period_elapsed(dpcm->substream);
}
static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
{
struct dummy_hrtimer_pcm *dpcm;
dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
if (!atomic_read(&dpcm->running))
return HRTIMER_NORESTART;
tasklet_schedule(&dpcm->tasklet);
hrtimer_forward_now(timer, dpcm->period_time);
return HRTIMER_RESTART;
}
static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
{
struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
atomic_set(&dpcm->running, 1);
return 0;
}
static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
{
struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
atomic_set(&dpcm->running, 0);
hrtimer_cancel(&dpcm->timer);
return 0;
}
static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
{
hrtimer_cancel(&dpcm->timer);
tasklet_kill(&dpcm->tasklet);
}
static snd_pcm_uframes_t
dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
u64 delta;
u32 pos;
delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
dpcm->base_time);
delta = div_u64(delta * runtime->rate + 999999, 1000000);
div_u64_rem(delta, runtime->buffer_size, &pos);
return pos;
}
static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
unsigned int period, rate;
long sec;
unsigned long nsecs;
dummy_hrtimer_sync(dpcm);
period = runtime->period_size;
rate = runtime->rate;
sec = period / rate;
period %= rate;
nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
dpcm->period_time = ktime_set(sec, nsecs);
return 0;
}
static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
{
struct dummy_hrtimer_pcm *dpcm;
dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
if (!dpcm)
return -ENOMEM;
substream->runtime->private_data = dpcm;
hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
dpcm->timer.function = dummy_hrtimer_callback;
dpcm->substream = substream;
atomic_set(&dpcm->running, 0);
tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
(unsigned long)dpcm);
return 0;
}
static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
{
struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
dummy_hrtimer_sync(dpcm);
kfree(dpcm);
}
static const struct dummy_timer_ops dummy_hrtimer_ops = {
.create = dummy_hrtimer_create,
.free = dummy_hrtimer_free,
.prepare = dummy_hrtimer_prepare,
.start = dummy_hrtimer_start,
.stop = dummy_hrtimer_stop,
.pointer = dummy_hrtimer_pointer,
};
#endif /* CONFIG_HIGH_RES_TIMERS */
/*
* PCM interface
*/
static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
return get_dummy_ops(substream)->start(substream);
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
return get_dummy_ops(substream)->stop(substream);
}
return -EINVAL;
}
static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
{
return get_dummy_ops(substream)->prepare(substream);
}
static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
{
return get_dummy_ops(substream)->pointer(substream);
}
static struct snd_pcm_hardware dummy_pcm_hardware = {
.info = (SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_RESUME |
SNDRV_PCM_INFO_MMAP_VALID),
.formats = USE_FORMATS,
.rates = USE_RATE,
.rate_min = USE_RATE_MIN,
.rate_max = USE_RATE_MAX,
.channels_min = USE_CHANNELS_MIN,
.channels_max = USE_CHANNELS_MAX,
.buffer_bytes_max = MAX_BUFFER_SIZE,
.period_bytes_min = MIN_PERIOD_SIZE,
.period_bytes_max = MAX_PERIOD_SIZE,
.periods_min = USE_PERIODS_MIN,
.periods_max = USE_PERIODS_MAX,
.fifo_size = 0,
};
static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
if (fake_buffer) {
/* runtime->dma_bytes has to be set manually to allow mmap */
substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
return 0;
}
return snd_pcm_lib_malloc_pages(substream,
params_buffer_bytes(hw_params));
}
static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
{
if (fake_buffer)
return 0;
return snd_pcm_lib_free_pages(substream);
}
static int dummy_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
struct dummy_model *model = dummy->model;
struct snd_pcm_runtime *runtime = substream->runtime;
const struct dummy_timer_ops *ops;
int err;
ops = &dummy_systimer_ops;
#ifdef CONFIG_HIGH_RES_TIMERS
if (hrtimer)
ops = &dummy_hrtimer_ops;
#endif
err = ops->create(substream);
if (err < 0)
return err;
get_dummy_ops(substream) = ops;
runtime->hw = dummy->pcm_hw;
if (substream->pcm->device & 1) {
runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
}
if (substream->pcm->device & 2)
runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID);
if (model == NULL)
return 0;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
if (model->playback_constraints)
err = model->playback_constraints(substream->runtime);
} else {
if (model->capture_constraints)
err = model->capture_constraints(substream->runtime);
}
if (err < 0) {
get_dummy_ops(substream)->free(substream);
return err;
}
return 0;
}
static int dummy_pcm_close(struct snd_pcm_substream *substream)
{
get_dummy_ops(substream)->free(substream);
return 0;
}
/*
* dummy buffer handling
*/
static void *dummy_page[2];
static void free_fake_buffer(void)
{
if (fake_buffer) {
int i;
for (i = 0; i < 2; i++)
if (dummy_page[i]) {
free_page((unsigned long)dummy_page[i]);
dummy_page[i] = NULL;
}
}
}
static int alloc_fake_buffer(void)
{
int i;
if (!fake_buffer)
return 0;
for (i = 0; i < 2; i++) {
dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL);
if (!dummy_page[i]) {
free_fake_buffer();
return -ENOMEM;
}
}
return 0;
}
static int dummy_pcm_copy(struct snd_pcm_substream *substream,
int channel, snd_pcm_uframes_t pos,
void __user *dst, snd_pcm_uframes_t count)
{
return 0; /* do nothing */
}
static int dummy_pcm_silence(struct snd_pcm_substream *substream,
int channel, snd_pcm_uframes_t pos,
snd_pcm_uframes_t count)
{
return 0; /* do nothing */
}
static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
unsigned long offset)
{
return virt_to_page(dummy_page[substream->stream]); /* the same page */
}
static struct snd_pcm_ops dummy_pcm_ops = {
.open = dummy_pcm_open,
.close = dummy_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = dummy_pcm_hw_params,
.hw_free = dummy_pcm_hw_free,
.prepare = dummy_pcm_prepare,
.trigger = dummy_pcm_trigger,
.pointer = dummy_pcm_pointer,
};
static struct snd_pcm_ops dummy_pcm_ops_no_buf = {
.open = dummy_pcm_open,
.close = dummy_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = dummy_pcm_hw_params,
.hw_free = dummy_pcm_hw_free,
.prepare = dummy_pcm_prepare,
.trigger = dummy_pcm_trigger,
.pointer = dummy_pcm_pointer,
.copy = dummy_pcm_copy,
.silence = dummy_pcm_silence,
.page = dummy_pcm_page,
};
static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
int substreams)
{
struct snd_pcm *pcm;
struct snd_pcm_ops *ops;
int err;
err = snd_pcm_new(dummy->card, "Dummy PCM", device,
substreams, substreams, &pcm);
if (err < 0)
return err;
dummy->pcm = pcm;
if (fake_buffer)
ops = &dummy_pcm_ops_no_buf;
else
ops = &dummy_pcm_ops;
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
pcm->private_data = dummy;
pcm->info_flags = 0;
strcpy(pcm->name, "Dummy PCM");
if (!fake_buffer) {
snd_pcm_lib_preallocate_pages_for_all(pcm,
SNDRV_DMA_TYPE_CONTINUOUS,
snd_dma_continuous_data(GFP_KERNEL),
0, 64*1024);
}
return 0;
}
/*
* mixer interface
*/
#define DUMMY_VOLUME(xname, xindex, addr) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
.name = xname, .index = xindex, \
.info = snd_dummy_volume_info, \
.get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
.private_value = addr, \
.tlv = { .p = db_scale_dummy } }
static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->count = 2;
uinfo->value.integer.min = -50;
uinfo->value.integer.max = 100;
return 0;
}
static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
int addr = kcontrol->private_value;
spin_lock_irq(&dummy->mixer_lock);
ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
spin_unlock_irq(&dummy->mixer_lock);
return 0;
}
static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
int change, addr = kcontrol->private_value;
int left, right;
left = ucontrol->value.integer.value[0];
if (left < -50)
left = -50;
if (left > 100)
left = 100;
right = ucontrol->value.integer.value[1];
if (right < -50)
right = -50;
if (right > 100)
right = 100;
spin_lock_irq(&dummy->mixer_lock);
change = dummy->mixer_volume[addr][0] != left ||
dummy->mixer_volume[addr][1] != right;
dummy->mixer_volume[addr][0] = left;
dummy->mixer_volume[addr][1] = right;
spin_unlock_irq(&dummy->mixer_lock);
return change;
}
static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
#define DUMMY_CAPSRC(xname, xindex, addr) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
.info = snd_dummy_capsrc_info, \
.get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
.private_value = addr }
#define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info
static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
int addr = kcontrol->private_value;
spin_lock_irq(&dummy->mixer_lock);
ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
spin_unlock_irq(&dummy->mixer_lock);
return 0;
}
static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
int change, addr = kcontrol->private_value;
int left, right;
left = ucontrol->value.integer.value[0] & 1;
right = ucontrol->value.integer.value[1] & 1;
spin_lock_irq(&dummy->mixer_lock);
change = dummy->capture_source[addr][0] != left &&
dummy->capture_source[addr][1] != right;
dummy->capture_source[addr][0] = left;
dummy->capture_source[addr][1] = right;
spin_unlock_irq(&dummy->mixer_lock);
return change;
}
static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *info)
{
const char *const names[] = { "None", "CD Player" };
return snd_ctl_enum_info(info, 1, 2, names);
}
static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *value)
{
struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
value->value.enumerated.item[0] = dummy->iobox;
return 0;
}
static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *value)
{
struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
int changed;
if (value->value.enumerated.item[0] > 1)
return -EINVAL;
changed = value->value.enumerated.item[0] != dummy->iobox;
if (changed) {
dummy->iobox = value->value.enumerated.item[0];
if (dummy->iobox) {
dummy->cd_volume_ctl->vd[0].access &=
~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
dummy->cd_switch_ctl->vd[0].access &=
~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
} else {
dummy->cd_volume_ctl->vd[0].access |=
SNDRV_CTL_ELEM_ACCESS_INACTIVE;
dummy->cd_switch_ctl->vd[0].access |=
SNDRV_CTL_ELEM_ACCESS_INACTIVE;
}
snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
&dummy->cd_volume_ctl->id);
snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
&dummy->cd_switch_ctl->id);
}
return changed;
}
static struct snd_kcontrol_new snd_dummy_controls[] = {
DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD),
{
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.name = "External I/O Box",
.info = snd_dummy_iobox_info,
.get = snd_dummy_iobox_get,
.put = snd_dummy_iobox_put,
},
};
static int snd_card_dummy_new_mixer(struct snd_dummy *dummy)
{
struct snd_card *card = dummy->card;
struct snd_kcontrol *kcontrol;
unsigned int idx;
int err;
spin_lock_init(&dummy->mixer_lock);
strcpy(card->mixername, "Dummy Mixer");
dummy->iobox = 1;
for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy);
err = snd_ctl_add(card, kcontrol);
if (err < 0)
return err;
if (!strcmp(kcontrol->id.name, "CD Volume"))
dummy->cd_volume_ctl = kcontrol;
else if (!strcmp(kcontrol->id.name, "CD Capture Switch"))
dummy->cd_switch_ctl = kcontrol;
}
return 0;
}
#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_PROC_FS)
/*
* proc interface
*/
static void print_formats(struct snd_dummy *dummy,
struct snd_info_buffer *buffer)
{
int i;
for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
if (dummy->pcm_hw.formats & (1ULL << i))
snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
}
}
static void print_rates(struct snd_dummy *dummy,
struct snd_info_buffer *buffer)
{
static int rates[] = {
5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
64000, 88200, 96000, 176400, 192000,
};
int i;
if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
snd_iprintf(buffer, " continuous");
if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
snd_iprintf(buffer, " knot");
for (i = 0; i < ARRAY_SIZE(rates); i++)
if (dummy->pcm_hw.rates & (1 << i))
snd_iprintf(buffer, " %d", rates[i]);
}
#define get_dummy_int_ptr(dummy, ofs) \
(unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
#define get_dummy_ll_ptr(dummy, ofs) \
(unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
struct dummy_hw_field {
const char *name;
const char *format;
unsigned int offset;
unsigned int size;
};
#define FIELD_ENTRY(item, fmt) { \
.name = #item, \
.format = fmt, \
.offset = offsetof(struct snd_pcm_hardware, item), \
.size = sizeof(dummy_pcm_hardware.item) }
static struct dummy_hw_field fields[] = {
FIELD_ENTRY(formats, "%#llx"),
FIELD_ENTRY(rates, "%#x"),
FIELD_ENTRY(rate_min, "%d"),
FIELD_ENTRY(rate_max, "%d"),
FIELD_ENTRY(channels_min, "%d"),
FIELD_ENTRY(channels_max, "%d"),
FIELD_ENTRY(buffer_bytes_max, "%ld"),
FIELD_ENTRY(period_bytes_min, "%ld"),
FIELD_ENTRY(period_bytes_max, "%ld"),
FIELD_ENTRY(periods_min, "%d"),
FIELD_ENTRY(periods_max, "%d"),
};
static void dummy_proc_read(struct snd_info_entry *entry,
struct snd_info_buffer *buffer)
{
struct snd_dummy *dummy = entry->private_data;
int i;
for (i = 0; i < ARRAY_SIZE(fields); i++) {
snd_iprintf(buffer, "%s ", fields[i].name);
if (fields[i].size == sizeof(int))
snd_iprintf(buffer, fields[i].format,
*get_dummy_int_ptr(dummy, fields[i].offset));
else
snd_iprintf(buffer, fields[i].format,
*get_dummy_ll_ptr(dummy, fields[i].offset));
if (!strcmp(fields[i].name, "formats"))
print_formats(dummy, buffer);
else if (!strcmp(fields[i].name, "rates"))
print_rates(dummy, buffer);