summaryrefslogtreecommitdiffstats
path: root/sound/oss/dmasound/dmasound_core.c
blob: 4b1baf4dd50eba2a0a506f26e55e07cef34d0f31 (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
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
/*
 *  linux/sound/oss/dmasound/dmasound_core.c
 *
 *
 *  OSS/Free compatible Atari TT/Falcon and Amiga DMA sound driver for
 *  Linux/m68k
 *  Extended to support Power Macintosh for Linux/ppc by Paul Mackerras
 *
 *  (c) 1995 by Michael Schlueter & Michael Marte
 *
 *  Michael Schlueter (michael@duck.syd.de) did the basic structure of the VFS
 *  interface and the u-law to signed byte conversion.
 *
 *  Michael Marte (marte@informatik.uni-muenchen.de) did the sound queue,
 *  /dev/mixer, /dev/sndstat and complemented the VFS interface. He would like
 *  to thank:
 *    - Michael Schlueter for initial ideas and documentation on the MFP and
 *	the DMA sound hardware.
 *    - Therapy? for their CD 'Troublegum' which really made me rock.
 *
 *  /dev/sndstat is based on code by Hannu Savolainen, the author of the
 *  VoxWare family of drivers.
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive
 *  for more details.
 *
 *  History:
 *
 *	1995/8/25	First release
 *
 *	1995/9/02	Roman Hodek:
 *			  - Fixed atari_stram_alloc() call, the timer
 *			    programming and several race conditions
 *	1995/9/14	Roman Hodek:
 *			  - After some discussion with Michael Schlueter,
 *			    revised the interrupt disabling
 *			  - Slightly speeded up U8->S8 translation by using
 *			    long operations where possible
 *			  - Added 4:3 interpolation for /dev/audio
 *
 *	1995/9/20	Torsten Scherer:
 *			  - Fixed a bug in sq_write and changed /dev/audio
 *			    converting to play at 12517Hz instead of 6258Hz.
 *
 *	1995/9/23	Torsten Scherer:
 *			  - Changed sq_interrupt() and sq_play() to pre-program
 *			    the DMA for another frame while there's still one
 *			    running. This allows the IRQ response to be
 *			    arbitrarily delayed and playing will still continue.
 *
 *	1995/10/14	Guenther Kelleter, Torsten Scherer:
 *			  - Better support for Falcon audio (the Falcon doesn't
 *			    raise an IRQ at the end of a frame, but at the
 *			    beginning instead!). uses 'if (codec_dma)' in lots
 *			    of places to simply switch between Falcon and TT
 *			    code.
 *
 *	1995/11/06	Torsten Scherer:
 *			  - Started introducing a hardware abstraction scheme
 *			    (may perhaps also serve for Amigas?)
 *			  - Can now play samples at almost all frequencies by
 *			    means of a more generalized expand routine
 *			  - Takes a good deal of care to cut data only at
 *			    sample sizes
 *			  - Buffer size is now a kernel runtime option
 *			  - Implemented fsync() & several minor improvements
 *			Guenther Kelleter:
 *			  - Useful hints and bug fixes
 *			  - Cross-checked it for Falcons
 *
 *	1996/3/9	Geert Uytterhoeven:
 *			  - Support added for Amiga, A-law, 16-bit little
 *			    endian.
 *			  - Unification to drivers/sound/dmasound.c.
 *
 *	1996/4/6	Martin Mitchell:
 *			  - Updated to 1.3 kernel.
 *
 *	1996/6/13       Topi Kanerva:
 *			  - Fixed things that were broken (mainly the amiga
 *			    14-bit routines)
 *			  - /dev/sndstat shows now the real hardware frequency
 *			  - The lowpass filter is disabled by default now
 *
 *	1996/9/25	Geert Uytterhoeven:
 *			  - Modularization
 *
 *	1998/6/10	Andreas Schwab:
 *			  - Converted to use sound_core
 *
 *	1999/12/28	Richard Zidlicky:
 *			  - Added support for Q40
 *
 *	2000/2/27	Geert Uytterhoeven:
 *			  - Clean up and split the code into 4 parts:
 *			      o dmasound_core: machine-independent code
 *			      o dmasound_atari: Atari TT and Falcon support
 *			      o dmasound_awacs: Apple PowerMac support
 *			      o dmasound_paula: Amiga support
 *
 *	2000/3/25	Geert Uytterhoeven:
 *			  - Integration of dmasound_q40
 *			  - Small clean ups
 *
 *	2001/01/26 [1.0] Iain Sandoe
 *			  - make /dev/sndstat show revision & edition info.
 *			  - since dmasound.mach.sq_setup() can fail on pmac
 *			    its type has been changed to int and the returns
 *			    are checked.
 *		   [1.1]  - stop missing translations from being called.
 *	2001/02/08 [1.2]  - remove unused translation tables & move machine-
 *			    specific tables to low-level.
 *			  - return correct info. for SNDCTL_DSP_GETFMTS.
 *		   [1.3]  - implement SNDCTL_DSP_GETCAPS fully.
 *		   [1.4]  - make /dev/sndstat text length usage deterministic.
 *			  - make /dev/sndstat call to low-level
 *			    dmasound.mach.state_info() pass max space to ll driver.
 *			  - tidy startup banners and output info.
 *		   [1.5]  - tidy up a little (removed some unused #defines in
 *			    dmasound.h)
 *			  - fix up HAS_RECORD conditionalisation.
 *			  - add record code in places it is missing...
 *			  - change buf-sizes to bytes to allow < 1kb for pmac
 *			    if user param entry is < 256 the value is taken to
 *			    be in kb > 256 is taken to be in bytes.
 *			  - make default buff/frag params conditional on
 *			    machine to allow smaller values for pmac.
 *			  - made the ioctls, read & write comply with the OSS
 *			    rules on setting params.
 *			  - added parsing of _setup() params for record.
 *	2001/04/04 [1.6]  - fix bug where sample rates higher than maximum were
 *			    being reported as OK.
 *			  - fix open() to return -EBUSY as per OSS doc. when
 *			    audio is in use - this is independent of O_NOBLOCK.
 *			  - fix bug where SNDCTL_DSP_POST was blocking.
 */

 /* Record capability notes 30/01/2001:
  * At present these observations apply only to pmac LL driver (the only one
  * that can do record, at present).  However, if other LL drivers for machines
  * with record are added they may apply.
  *
  * The fragment parameters for the record and play channels are separate.
  * However, if the driver is opened O_RDWR there is no way (in the current OSS
  * API) to specify their values independently for the record and playback
  * channels.  Since the only common factor between the input & output is the
  * sample rate (on pmac) it should be possible to open /dev/dspX O_WRONLY and
  * /dev/dspY O_RDONLY.  The input & output channels could then have different
  * characteristics (other than the first that sets sample rate claiming the
  * right to set it for ever).  As it stands, the format, channels, number of
  * bits & sample rate are assumed to be common.  In the future perhaps these
  * should be the responsibility of the LL driver - and then if a card really
  * does not share items between record & playback they can be specified
  * separately.
*/

/* Thread-safeness of shared_resources notes: 31/01/2001
 * If the user opens O_RDWR and then splits record & play between two threads
 * both of which inherit the fd - and then starts changing things from both
 * - we will have difficulty telling.
 *
 * It's bad application coding - but ...
 * TODO: think about how to sort this out... without bogging everything down in
 * semaphores.
 *
 * Similarly, the OSS spec says "all changes to parameters must be between
 * open() and the first read() or write(). - and a bit later on (by
 * implication) "between SNDCTL_DSP_RESET and the first read() or write() after
 * it".  If the app is multi-threaded and this rule is broken between threads
 * we will have trouble spotting it - and the fault will be rather obscure :-(
 *
 * We will try and put out at least a kmsg if we see it happen... but I think
 * it will be quite hard to trap it with an -EXXX return... because we can't
 * see the fault until after the damage is done.
*/

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/sound.h>
#include <linux/init.h>
#include <linux/soundcard.h>
#include <linux/poll.h>
#include <linux/mutex.h>
#include <linux/sched/signal.h>

#include <linux/uaccess.h>

#include "dmasound.h"

#define DMASOUND_CORE_REVISION 1
#define DMASOUND_CORE_EDITION 6

    /*
     *  Declarations
     */

static DEFINE_MUTEX(dmasound_core_mutex);
int dmasound_catchRadius = 0;
module_param(dmasound_catchRadius, int, 0);

static unsigned int numWriteBufs = DEFAULT_N_BUFFERS;
module_param(numWriteBufs, int, 0);
static unsigned int writeBufSize = DEFAULT_BUFF_SIZE ;	/* in bytes */
module_param(writeBufSize, int, 0);

MODULE_DESCRIPTION("Atari/Amiga/Q40 core DMA sound driver");
MODULE_LICENSE("GPL");

static int sq_unit = -1;
static int mixer_unit = -1;
static int state_unit = -1;
static int irq_installed;

/* control over who can modify resources shared between play/record */
static fmode_t shared_resource_owner;
static int shared_resources_initialised;

    /*
     *  Mid level stuff
     */

struct sound_settings dmasound = {
	.lock = __SPIN_LOCK_UNLOCKED(dmasound.lock)
};

static inline void sound_silence(void)
{
	dmasound.mach.silence(); /* _MUST_ stop DMA */
}

static inline int sound_set_format(int format)
{
	return dmasound.mach.setFormat(format);
}


static int sound_set_speed(int speed)
{
	if (speed < 0)
		return dmasound.soft.speed;

	/* trap out-of-range speed settings.
	   at present we allow (arbitrarily) low rates - using soft
	   up-conversion - but we can't allow > max because there is
	   no soft down-conversion.
	*/
	if (dmasound.mach.max_dsp_speed &&
	   (speed > dmasound.mach.max_dsp_speed))
		speed = dmasound.mach.max_dsp_speed ;

	dmasound.soft.speed = speed;

	if (dmasound.minDev == SND_DEV_DSP)
		dmasound.dsp.speed = dmasound.soft.speed;

	return dmasound.soft.speed;
}

static int sound_set_stereo(int stereo)
{
	if (stereo < 0)
		return dmasound.soft.stereo;

	stereo = !!stereo;    /* should be 0 or 1 now */

	dmasound.soft.stereo = stereo;
	if (dmasound.minDev == SND_DEV_DSP)
		dmasound.dsp.stereo = stereo;

	return stereo;
}

static ssize_t sound_copy_translate(TRANS *trans, const u_char __user *userPtr,
				    size_t userCount, u_char frame[],
				    ssize_t *frameUsed, ssize_t frameLeft)
{
	ssize_t (*ct_func)(const u_char __user *, size_t, u_char *, ssize_t *, ssize_t);

	switch (dmasound.soft.format) {
	    case AFMT_MU_LAW:
		ct_func = trans->ct_ulaw;
		break;
	    case AFMT_A_LAW:
		ct_func = trans->ct_alaw;
		break;
	    case AFMT_S8:
		ct_func = trans->ct_s8;
		break;
	    case AFMT_U8:
		ct_func = trans->ct_u8;
		break;
	    case AFMT_S16_BE:
		ct_func = trans->ct_s16be;
		break;
	    case AFMT_U16_BE:
		ct_func = trans->ct_u16be;
		break;
	    case AFMT_S16_LE:
		ct_func = trans->ct_s16le;
		break;
	    case AFMT_U16_LE:
		ct_func = trans->ct_u16le;
		break;
	    default:
		return 0;
	}
	/* if the user has requested a non-existent translation don't try
	   to call it but just return 0 bytes moved
	*/
	if (ct_func)
		return ct_func(userPtr, userCount, frame, frameUsed, frameLeft);
	return 0;
}

    /*
     *  /dev/mixer abstraction
     */

static struct {
    int busy;
    int modify_counter;
} mixer;

static int mixer_open(struct inode *inode, struct file *file)
{
	mutex_lock(&dmasound_core_mutex);
	if (!try_module_get(dmasound.mach.owner)) {
		mutex_unlock(&dmasound_core_mutex);
		return -ENODEV;
	}
	mixer.busy = 1;
	mutex_unlock(&dmasound_core_mutex);
	return 0;
}

static int mixer_release(struct inode *inode, struct file *file)
{
	mutex_lock(&dmasound_core_mutex);
	mixer.busy = 0;
	module_put(dmasound.mach.owner);
	mutex_unlock(&dmasound_core_mutex);
	return 0;
}

static int mixer_ioctl(struct file *file, u_int cmd, u_long arg)
{
	if (_SIOC_DIR(cmd) & _SIOC_WRITE)
	    mixer.modify_counter++;
	switch (cmd) {
	    case OSS_GETVERSION:
		return IOCTL_OUT(arg, SOUND_VERSION);
	    case SOUND_MIXER_INFO:
		{
		    mixer_info info;
		    memset(&info, 0, sizeof(info));
		    strscpy(info.id, dmasound.mach.name2, sizeof(info.id));
		    strscpy(info.name, dmasound.mach.name2, sizeof(info.name));
		    info.modify_counter = mixer.modify_counter;
		    if (copy_to_user((void __user *)arg, &info, sizeof(info)))
			    return -EFAULT;
		    return 0;
		}
	}
	if (dmasound.mach.mixer_ioctl)
	    return dmasound.mach.mixer_ioctl(cmd, arg);
	return -EINVAL;
}

static long mixer_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
{
	int ret;

	mutex_lock(&dmasound_core_mutex);
	ret = mixer_ioctl(file, cmd, arg);
	mutex_unlock(&dmasound_core_mutex);

	return ret;
}

static const struct file_operations mixer_fops =
{
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.unlocked_ioctl	= mixer_unlocked_ioctl,
	.compat_ioctl	= compat_ptr_ioctl,
	.open		= mixer_open,
	.release	= mixer_release,
};

static void mixer_init(void)
{
	mixer_unit = register_sound_mixer(&mixer_fops, -1);
	if (mixer_unit < 0)
		return;

	mixer.busy = 0;
	dmasound.treble = 0;
	dmasound.bass = 0;
	if (dmasound.mach.mixer_init)
	    dmasound.mach.mixer_init();
}


    /*
     *  Sound queue stuff, the heart of the driver
     */

struct sound_queue dmasound_write_sq;
static void sq_reset_output(void) ;

static int sq_allocate_buffers(struct sound_queue *sq, int num, int size)
{
	int i;

	if (sq->buffers)
		return 0;
	sq->numBufs = num;
	sq->bufSize = size;
	sq->buffers = kmalloc_array (num, sizeof(char *), GFP_KERNEL);
	if (!sq->buffers)
		return -ENOMEM;
	for (i = 0; i < num; i++) {
		sq->buffers[i] = dmasound.mach.dma_alloc(size, GFP_KERNEL);
		if (!sq->buffers[i]) {
			while (i--)
				dmasound.mach.dma_free(sq->buffers[i], size);
			kfree(sq->buffers);
			sq->buffers = NULL;
			return -ENOMEM;
		}
	}
	return 0;
}

static void sq_release_buffers(struct sound_queue *sq)
{
	int i;

	if (sq->buffers) {
		for (i = 0; i < sq->numBufs; i++)
			dmasound.mach.dma_free(sq->buffers[i], sq->bufSize);
		kfree(sq->buffers);
		sq->buffers = NULL;
	}
}


static int sq_setup(struct sound_queue *sq)
{
	int (*setup_func)(void) = NULL;
	int hard_frame ;

	if (sq->locked) { /* are we already set? - and not changeable */
#ifdef DEBUG_DMASOUND
printk("dmasound_core: tried to sq_setup a locked queue\n") ;
#endif
		return -EINVAL ;
	}
	sq->locked = 1 ; /* don't think we have a race prob. here _check_ */

	/* make sure that the parameters are set up
	   This should have been done already...
	*/

	dmasound.mach.init();

	/* OK.  If the user has set fragment parameters explicitly, then we
	   should leave them alone... as long as they are valid.
	   Invalid user fragment params can occur if we allow the whole buffer
	   to be used when the user requests the fragments sizes (with no soft
	   x-lation) and then the user subsequently sets a soft x-lation that
	   requires increased internal buffering.

	   Othwerwise (if the user did not set them) OSS says that we should
	   select frag params on the basis of 0.5 s output & 0.1 s input
	   latency. (TODO.  For now we will copy in the defaults.)
	*/

	if (sq->user_frags <= 0) {
		sq->max_count = sq->numBufs ;
		sq->max_active = sq->numBufs ;
		sq->block_size = sq->bufSize;
		/* set up the user info */
		sq->user_frags = sq->numBufs ;
		sq->user_frag_size = sq->bufSize ;
		sq->user_frag_size *=
			(dmasound.soft.size * (dmasound.soft.stereo+1) ) ;
		sq->user_frag_size /=
			(dmasound.hard.size * (dmasound.hard.stereo+1) ) ;
	} else {
		/* work out requested block size */
		sq->block_size = sq->user_frag_size ;
		sq->block_size *=
			(dmasound.hard.size * (dmasound.hard.stereo+1) ) ;
		sq->block_size /=
			(dmasound.soft.size * (dmasound.soft.stereo+1) ) ;
		/* the user wants to write frag-size chunks */
		sq->block_size *= dmasound.hard.speed ;
		sq->block_size /= dmasound.soft.speed ;
		/* this only works for size values which are powers of 2 */
		hard_frame =
			(dmasound.hard.size * (dmasound.hard.stereo+1))/8 ;
		sq->block_size +=  (hard_frame - 1) ;
		sq->block_size &= ~(hard_frame - 1) ; /* make sure we are aligned */
		/* let's just check for obvious mistakes */
		if ( sq->block_size <= 0 || sq->block_size > sq->bufSize) {
#ifdef DEBUG_DMASOUND
printk("dmasound_core: invalid frag size (user set %d)\n", sq->user_frag_size) ;
#endif
			sq->block_size = sq->bufSize ;
		}
		if ( sq->user_frags <= sq->numBufs ) {
			sq->max_count = sq->user_frags ;
			/* if user has set max_active - then use it */
			sq->max_active = (sq->max_active <= sq->max_count) ?
				sq->max_active : sq->max_count ;
		} else {
#ifdef DEBUG_DMASOUND
printk("dmasound_core: invalid frag count (user set %d)\n", sq->user_frags) ;
#endif
			sq->max_count =
			sq->max_active = sq->numBufs ;
		}
	}
	sq->front = sq->count = sq->rear_size = 0;
	sq->syncing = 0;
	sq->active = 0;

	if (sq == &write_sq) {
	    sq->rear = -1;
	    setup_func = dmasound.mach.write_sq_setup;
	}
	if (setup_func)
	    return setup_func();
	return 0 ;
}

static inline void sq_play(void)
{
	dmasound.mach.play();
}

static ssize_t sq_write(struct file *file, const char __user *src, size_t uLeft,
			loff_t *ppos)
{
	ssize_t uWritten = 0;
	u_char *dest;
	ssize_t uUsed = 0, bUsed, bLeft;
	unsigned long flags ;

	/* ++TeSche: Is something like this necessary?
	 * Hey, that's an honest question! Or does any other part of the
	 * filesystem already checks this situation? I really don't know.
	 */
	if (uLeft == 0)
		return 0;

	/* implement any changes we have made to the soft/hard params.
	   this is not satisfactory really, all we have done up to now is to
	   say what we would like - there hasn't been any real checking of capability
	*/

	if (shared_resources_initialised == 0) {
		dmasound.mach.init() ;
		shared_resources_initialised = 1 ;
	}

	/* set up the sq if it is not already done. This may seem a dumb place
	   to do it - but it is what OSS requires.  It means that write() can
	   return memory allocation errors.  To avoid this possibility use the
	   GETBLKSIZE or GETOSPACE ioctls (after you've fiddled with all the
	   params you want to change) - these ioctls also force the setup.
	*/

	if (write_sq.locked == 0) {
		if ((uWritten = sq_setup(&write_sq)) < 0) return uWritten ;
		uWritten = 0 ;
	}

/* FIXME: I think that this may be the wrong behaviour when we get strapped
	for time and the cpu is close to being (or actually) behind in sending data.
	- because we've lost the time that the N samples, already in the buffer,
	would have given us to get here with the next lot from the user.
*/
	/* The interrupt doesn't start to play the last, incomplete frame.
	 * Thus we can append to it without disabling the interrupts! (Note
	 * also that write_sq.rear isn't affected by the interrupt.)
	 */

	/* as of 1.6 this behaviour changes if SNDCTL_DSP_POST has been issued:
	   this will mimic the behaviour of syncing and allow the sq_play() to
	   queue a partial fragment.  Since sq_play() may/will be called from
	   the IRQ handler - at least on Pmac we have to deal with it.
	   The strategy - possibly not optimum - is to kill _POST status if we
	   get here.  This seems, at least, reasonable - in the sense that POST
	   is supposed to indicate that we might not write before the queue
	   is drained - and if we get here in time then it does not apply.
	*/

	spin_lock_irqsave(&dmasound.lock, flags);
	write_sq.syncing &= ~2 ; /* take out POST status */
	spin_unlock_irqrestore(&dmasound.lock, flags);

	if (write_sq.count > 0 &&
	    (bLeft = write_sq.block_size-write_sq.rear_size) > 0) {
		dest = write_sq.buffers[write_sq.rear];
		bUsed = write_sq.rear_size;
		uUsed = sound_copy_translate(dmasound.trans_write, src, uLeft,
					     dest, &bUsed, bLeft);
		if (uUsed <= 0)
			return uUsed;
		src += uUsed;
		uWritten += uUsed;
		uLeft = (uUsed <= uLeft) ? (uLeft - uUsed) : 0 ; /* paranoia */
		write_sq.rear_size = bUsed;
	}

	while (uLeft) {
		DEFINE_WAIT(wait);

		while (write_sq.count >= write_sq.max_active) {
			prepare_to_wait(&write_sq.action_queue, &wait, TASK_INTERRUPTIBLE);
			sq_play();
			if (write_sq.non_blocking) {
				finish_wait(&write_sq.action_queue, &wait);
				return uWritten > 0 ? uWritten : -EAGAIN;
			}
			if (write_sq.count < write_sq.max_active)
				break;

			schedule_timeout(HZ);
			if (signal_pending(current)) {
				finish_wait(&write_sq.action_queue, &wait);
				return uWritten > 0 ? uWritten : -EINTR;
			}
		}

		finish_wait(&write_sq.action_queue, &wait);

		/* Here, we can avoid disabling the interrupt by first
		 * copying and translating the data, and then updating
		 * the write_sq variables. Until this is done, the interrupt
		 * won't see the new frame and we can work on it
		 * undisturbed.
		 */

		dest = write_sq.buffers[(write_sq.rear+1) % write_sq.max_count];
		bUsed = 0;
		bLeft = write_sq.block_size;
		uUsed = sound_copy_translate(dmasound.trans_write, src, uLeft,
					     dest, &bUsed, bLeft);
		if (uUsed <= 0)
			break;
		src += uUsed;
		uWritten += uUsed;
		uLeft = (uUsed <= uLeft) ? (uLeft - uUsed) : 0 ; /* paranoia */
		if (bUsed) {
			write_sq.rear = (write_sq.rear+1) % write_sq.max_count;
			write_sq.rear_size = bUsed;
			write_sq.count++;
		}
	} /* uUsed may have been 0 */

	sq_play();

	return uUsed < 0? uUsed: uWritten;
}

static __poll_t sq_poll(struct file *file, struct poll_table_struct *wait)
{
	__poll_t mask = 0;
	int retVal;
	
	if (write_sq.locked == 0) {
		if ((retVal = sq_setup(&write_sq)) < 0)
			return retVal;
		return 0;
	}
	if (file->f_mode & FMODE_WRITE )
		poll_wait(file, &write_sq.action_queue, wait);
	if (file->f_mode & FMODE_WRITE)
		if (write_sq.count < write_sq.max_active || write_sq.block_size - write_sq.rear_size > 0)
			mask |= EPOLLOUT | EPOLLWRNORM;
	return mask;

}

static inline void sq_init_waitqueue(struct sound_queue *sq)
{
	init_waitqueue_head(&sq->action_queue);
	init_waitqueue_head(&sq->open_queue);
	init_waitqueue_head(&sq->sync_queue);
	sq->busy = 0;
}

#if 0 /* blocking open() */
static inline void sq_wake_up(struct sound_queue *sq, struct file *file,
			      fmode_t mode)
{
	if (file->f_mode & mode) {
		sq->busy = 0; /* CHECK: IS THIS OK??? */
		WAKE_UP(sq->open_queue);
	}
}
#endif

static int sq_open2(struct sound_queue *sq, struct file *file, fmode_t mode,
		    int numbufs, int bufsize)
{
	int rc = 0;

	if (file->f_mode & mode) {
		if (sq->busy) {
#if 0 /* blocking open() */
			rc = -EBUSY;
			if (file->f_flags & O_NONBLOCK)
				return rc;
			rc = -EINTR;
			if (wait_event_interruptible(sq->open_queue, !sq->busy))
				return rc;
			rc = 0;
#else
			/* OSS manual says we will return EBUSY regardless
			   of O_NOBLOCK.
			*/
			return -EBUSY ;
#endif
		}
		sq->busy = 1; /* Let's play spot-the-race-condition */

		/* allocate the default number & size of buffers.
		   (i.e. specified in _setup() or as module params)
		   can't be changed at the moment - but _could_ be perhaps
		   in the setfragments ioctl.
		*/
		if (( rc = sq_allocate_buffers(sq, numbufs, bufsize))) {
#if 0 /* blocking open() */
			sq_wake_up(sq, file, mode);
#else
			sq->busy = 0 ;
#endif
			return rc;
		}

		sq->non_blocking = file->f_flags & O_NONBLOCK;
	}
	return rc;
}

#define write_sq_init_waitqueue()	sq_init_waitqueue(&write_sq)
#if 0 /* blocking open() */
#define write_sq_wake_up(file)		sq_wake_up(&write_sq, file, FMODE_WRITE)
#endif
#define write_sq_release_buffers()	sq_release_buffers(&write_sq)
#define write_sq_open(file)	\
	sq_open2(&write_sq, file, FMODE_WRITE, numWriteBufs, writeBufSize )

static int sq_open(struct inode *inode, struct file *file)
{
	int rc;

	mutex_lock(&dmasound_core_mutex);
	if (!try_module_get(dmasound.mach.owner)) {
		mutex_unlock(&dmasound_core_mutex);
		return -ENODEV;
	}

	rc = write_sq_open(file); /* checks the f_mode */
	if (rc)
		goto out;
	if (file->f_mode & FMODE_READ) {
		/* TODO: if O_RDWR, release any resources grabbed by write part */
		rc = -ENXIO ; /* I think this is what is required by open(2) */
		goto out;
	}

	if (dmasound.mach.sq_open)
	    dmasound.mach.sq_open(file->f_mode);

	/* CHECK whether this is sensible - in the case that dsp0 could be opened
	  O_RDONLY and dsp1 could be opened O_WRONLY
	*/

	dmasound.minDev = iminor(inode) & 0x0f;

	/* OK. - we should make some attempt at consistency. At least the H'ware
	   options should be set with a valid mode.  We will make it that the LL
	   driver must supply defaults for hard & soft params.
	*/

	if (shared_resource_owner == 0) {
		/* you can make this AFMT_U8/mono/8K if you want to mimic old
		   OSS behaviour - while we still have soft translations ;-) */
		dmasound.soft = dmasound.mach.default_soft ;
		dmasound.dsp = dmasound.mach.default_soft ;
		dmasound.hard = dmasound.mach.default_hard ;
	}

#ifndef DMASOUND_STRICT_OSS_COMPLIANCE
	/* none of the current LL drivers can actually do this "native" at the moment
	   OSS does not really require us to supply /dev/audio if we can't do it.
	*/
	if (dmasound.minDev == SND_DEV_AUDIO) {
		sound_set_speed(8000);
		sound_set_stereo(0);
		sound_set_format(AFMT_MU_LAW);
	}
#endif
	mutex_unlock(&dmasound_core_mutex);
	return 0;
 out:
	module_put(dmasound.mach.owner);
	mutex_unlock(&dmasound_core_mutex);
	return rc;
}

static void sq_reset_output(void)
{
	sound_silence(); /* this _must_ stop DMA, we might be about to lose the buffers */
	write_sq.active = 0;
	write_sq.count = 0;
	write_sq.rear_size = 0;
	/* write_sq.front = (write_sq.rear+1) % write_sq.max_count;*/
	write_sq.front = 0 ;
	write_sq.rear = -1 ; /* same as for set-up */

	/* OK - we can unlock the parameters and fragment settings */
	write_sq.locked = 0 ;
	write_sq.user_frags = 0 ;
	write_sq.user_frag_size = 0 ;
}

static void sq_reset(void)
{
	sq_reset_output() ;
	/* we could consider resetting the shared_resources_owner here... but I
	   think it is probably still rather non-obvious to application writer
	*/

	/* we release everything else though */
	shared_resources_initialised = 0 ;
}

static int sq_fsync(void)
{
	int rc = 0;
	int timeout = 5;

	write_sq.syncing |= 1;
	sq_play();	/* there may be an incomplete frame waiting */

	while (write_sq.active) {
		wait_event_interruptible_timeout(write_sq.sync_queue,
						 !write_sq.active, HZ);
		if (signal_pending(current)) {
			/* While waiting for audio output to drain, an
			 * interrupt occurred.  Stop audio output immediately
			 * and clear the queue. */
			sq_reset_output();
			rc = -EINTR;
			break;
		}
		if (!--timeout) {
			printk(KERN_WARNING "dmasound: Timeout draining output\n");
			sq_reset_output();
			rc = -EIO;
			break;
		}
	}

	/* flag no sync regardless of whether we had a DSP_POST or not */
	write_sq.syncing = 0 ;
	return rc;
}

static int sq_release(struct inode *inode, struct file *file)
{
	int rc = 0;

	mutex_lock(&dmasound_core_mutex);

	if (file->f_mode & FMODE_WRITE) {
		if (write_sq.busy)
			rc = sq_fsync();

		sq_reset_output() ; /* make sure dma is stopped and all is quiet */
		write_sq_release_buffers();
		write_sq.busy = 0;
	}

	if (file->f_mode & shared_resource_owner) { /* it's us that has them */
		shared_resource_owner = 0 ;
		shared_resources_initialised = 0 ;
		dmasound.hard = dmasound.mach.default_hard ;
	}

	module_put(dmasound.mach.owner);

#if 0 /* blocking open() */
	/* Wake up a process waiting for the queue being released.
	 * Note: There may be several processes waiting for a call
	 * to open() returning. */

	/* Iain: hmm I don't understand this next comment ... */
	/* There is probably a DOS atack here. They change the mode flag. */
	/* XXX add check here,*/
	read_sq_wake_up(file); /* checks f_mode */
	write_sq_wake_up(file); /* checks f_mode */
#endif /* blocking open() */

	mutex_unlock(&dmasound_core_mutex);

	return rc;
}

/* here we see if we have a right to modify format, channels, size and so on
   if no-one else has claimed it already then we do...

   TODO: We might change this to mask O_RDWR such that only one or the other channel
   is the owner - if we have problems.
*/

static int shared_resources_are_mine(fmode_t md)
{
	if (shared_resource_owner)
		return (shared_resource_owner & md) != 0;
	else {
		shared_resource_owner = md ;
		return 1 ;
	}
}

/* if either queue is locked we must deny the right to change shared params
*/

static int queues_are_quiescent(void)
{
	if (write_sq.locked)
		return 0 ;
	return 1 ;
}

/* check and set a queue's fragments per user's wishes...
   we will check against the pre-defined literals and the actual sizes.
   This is a bit fraught - because soft translations can mess with our
   buffer requirements *after* this call - OSS says "call setfrags first"
*/

/* It is possible to replace all the -EINVAL returns with an override that
   just puts the allowable value in.  This may be what many OSS apps require
*/

static int set_queue_frags(struct sound_queue *sq, int bufs, int size)
{
	if (sq->locked) {
#ifdef DEBUG_DMASOUND
printk("dmasound_core: tried to set_queue_frags on a locked queue\n") ;
#endif
		return -EINVAL ;
	}

	if ((size < MIN_FRAG_SIZE) || (size > MAX_FRAG_SIZE))
		return -EINVAL ;
	size = (1<<size) ; /* now in bytes */
	if (size > sq->bufSize)
		return -EINVAL ; /* this might still not work */

	if (bufs <= 0)
		return -EINVAL ;
	if (bufs > sq->numBufs) /* the user is allowed say "don't care" with 0x7fff */
		bufs = sq->numBufs ;

	/* there is, currently, no way to specify max_active separately
	   from max_count.  This could be a LL driver issue - I guess
	   if there is a requirement for these values to be different then
	  we will have to pass that info. up to this level.
	*/
	sq->user_frags =
	sq->max_active = bufs ;
	sq->user_frag_size = size ;

	return 0 ;
}

static int sq_ioctl(struct file *file, u_int cmd, u_long arg)
{
	int val, result;
	u_long fmt;
	int data;
	int size, nbufs;
	audio_buf_info info;

	switch (cmd) {
	case SNDCTL_DSP_RESET:
		sq_reset();
		return 0;
	case SNDCTL_DSP_GETFMTS:
		fmt = dmasound.mach.hardware_afmts ; /* this is what OSS says.. */
		return IOCTL_OUT(arg, fmt);
	case SNDCTL_DSP_GETBLKSIZE:
		/* this should tell the caller about bytes that the app can
		   read/write - the app doesn't care about our internal buffers.
		   We force sq_setup() here as per OSS 1.1 (which should
		   compute the values necessary).
		   Since there is no mechanism to specify read/write separately, for
		   fds opened O_RDWR, the write_sq values will, arbitrarily, overwrite
		   the read_sq ones.
		*/
		size = 0 ;
		if (file->f_mode & FMODE_WRITE) {
			if ( !write_sq.locked )
				sq_setup(&write_sq) ;
			size = write_sq.user_frag_size ;
		}
		return IOCTL_OUT(arg, size);
	case SNDCTL_DSP_POST:
		/* all we are going to do is to tell the LL that any
		   partial frags can be queued for output.
		   The LL will have to clear this flag when last output
		   is queued.
		*/
		write_sq.syncing |= 0x2 ;
		sq_play() ;
		return 0 ;
	case SNDCTL_DSP_SYNC:
		/* This call, effectively, has the same behaviour as SNDCTL_DSP_RESET
		   except that it waits for output to finish before resetting
		   everything - read, however, is killed immediately.
		*/
		result = 0 ;
		if (file->f_mode & FMODE_WRITE) {
			result = sq_fsync();
			sq_reset_output() ;
		}
		/* if we are the shared resource owner then release them */
		if (file->f_mode & shared_resource_owner)
			shared_resources_initialised = 0 ;
		return result ;
	case SOUND_PCM_READ_RATE:
		return IOCTL_OUT(arg, dmasound.soft.speed);
	case SNDCTL_DSP_SPEED:
		/* changing this on the fly will have weird effects on the sound.
		   Where there are rate conversions implemented in soft form - it
		   will cause the _ctx_xxx() functions to be substituted.
		   However, there doesn't appear to be any reason to dis-allow it from
		   a driver pov.
		*/
		if (shared_resources_are_mine(file->f_mode)) {
			IOCTL_IN(arg, data);
			data = sound_set_speed(data) ;
			shared_resources_initialised = 0 ;
			return IOCTL_OUT(arg, data);
		} else
			return -EINVAL ;
		break ;
	/* OSS says these next 4 actions are undefined when the device is
	   busy/active - we will just return -EINVAL.
	   To be allowed to change one - (a) you have to own the right
	    (b) the queue(s) must be quiescent
	*/
	case SNDCTL_DSP_STEREO:
		if (shared_resources_are_mine(file->f_mode) &&
		    queues_are_quiescent()) {
			IOCTL_IN(arg, data);
			shared_resources_initialised = 0 ;
			return IOCTL_OUT(arg, sound_set_stereo(data));
		} else
			return -EINVAL ;
		break ;
	case SOUND_PCM_WRITE_CHANNELS:
		if (shared_resources_are_mine(file->f_mode) &&
		    queues_are_quiescent()) {
			IOCTL_IN(arg, data);
			/* the user might ask for 20 channels, we will return 1 or 2 */
			shared_resources_initialised = 0 ;
			return IOCTL_OUT(arg, sound_set_stereo(data-1)+1);
		} else
			return -EINVAL ;
		break ;
	case SNDCTL_DSP_SETFMT:
		if (shared_resources_are_mine(file->f_mode) &&
		    queues_are_quiescent()) {
		    	int format;
			IOCTL_IN(arg, data);
			shared_resources_initialised = 0 ;
			format = sound_set_format(data);
			result = IOCTL_OUT(arg, format);
			if (result < 0)
				return result;
			if (format != data && data != AFMT_QUERY)
				return -EINVAL;
			return 0;
		} else
			return -EINVAL ;
	case SNDCTL_DSP_SUBDIVIDE:
		return -EINVAL ;
	case SNDCTL_DSP_SETFRAGMENT:
		/* we can do this independently for the two queues - with the
		   proviso that for fds opened O_RDWR we cannot separate the
		   actions and both queues will be set per the last call.
		   NOTE: this does *NOT* actually set the queue up - merely
		   registers our intentions.
		*/
		IOCTL_IN(arg, data);
		result = 0 ;
		nbufs = (data >> 16) & 0x7fff ; /* 0x7fff is 'use maximum' */
		size = data & 0xffff;
		if (file->f_mode & FMODE_WRITE) {
			result = set_queue_frags(&write_sq, nbufs, size) ;
			if (result)
				return result ;
		}
		/* NOTE: this return value is irrelevant - OSS specifically says that
		   the value is 'random' and that the user _must_ check the actual
		   frags values using SNDCTL_DSP_GETBLKSIZE or similar */
		return IOCTL_OUT(arg, data);
	case SNDCTL_DSP_GETOSPACE:
		/*
		*/
		if (file->f_mode & FMODE_WRITE) {
			if ( !write_sq.locked )
				sq_setup(&write_sq) ;
			info.fragments = write_sq.max_active - write_sq.count;
			info.fragstotal = write_sq.max_active;
			info.fragsize = write_sq.user_frag_size;
			info.bytes = info.fragments * info.fragsize;
			if (copy_to_user((void __user *)arg, &info, sizeof(info)))
				return -EFAULT;
			return 0;
		} else
			return -EINVAL ;
		break ;
	case SNDCTL_DSP_GETCAPS:
		val = dmasound.mach.capabilities & 0xffffff00;
		return IOCTL_OUT(arg,val);

	default:
		return mixer_ioctl(file, cmd, arg);
	}
	return -EINVAL;
}

static long sq_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
{
	int ret;

	mutex_lock(&dmasound_core_mutex);
	ret = sq_ioctl(file, cmd, arg);
	mutex_unlock(&dmasound_core_mutex);

	return ret;
}

static const struct file_operations sq_fops =
{
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.write		= sq_write,
	.poll		= sq_poll,
	.unlocked_ioctl	= sq_unlocked_ioctl,
	.compat_ioctl	= compat_ptr_ioctl,
	.open		= sq_open,
	.release	= sq_release,
};

static int sq_init(void)
{
	const struct file_operations *fops = &sq_fops;

	sq_unit = register_sound_dsp(fops, -1);
	if (sq_unit < 0) {
		printk(KERN_ERR "dmasound_core: couldn't register fops\n") ;
		return sq_unit ;
	}

	write_sq_init_waitqueue();

	/* These parameters will be restored for every clean open()
	 * in the case of multiple open()s (e.g. dsp0 & dsp1) they
	 * will be set so long as the shared resources have no owner.
	 */

	if (shared_resource_owner == 0) {
		dmasound.soft = dmasound.mach.default_soft ;
		dmasound.hard = dmasound.mach.default_hard ;
		dmasound.dsp = dmasound.mach.default_soft ;
		shared_resources_initialised = 0 ;
	}
	return 0 ;
}


    /*
     *  /dev/sndstat
     */

/* we allow more space for record-enabled because there are extra output lines.
   the number here must include the amount we are prepared to give to the low-level
   driver.
*/

#define STAT_BUFF_LEN 768

/* this is how much space we will allow the low-level driver to use
   in the stat buffer.  Currently, 2 * (80 character line + <NL>).
   We do not police this (it is up to the ll driver to be honest).
*/

#define LOW_LEVEL_STAT_ALLOC 162

static struct {
    int busy;
    char buf[STAT_BUFF_LEN];	/* state.buf should not overflow! */
    int len, ptr;
} state;

/* publish this function for use by low-level code, if required */

static char *get_afmt_string(int afmt)
{
        switch(afmt) {
            case AFMT_MU_LAW:
                return "mu-law";
            case AFMT_A_LAW:
                return "A-law";
            case AFMT_U8:
                return "unsigned 8 bit";
            case AFMT_S8:
                return "signed 8 bit";
            case AFMT_S16_BE:
                return "signed 16 bit BE";
            case AFMT_U16_BE:
                return "unsigned 16 bit BE";
            case AFMT_S16_LE:
                return "signed 16 bit LE";
            case AFMT_U16_LE:
                return "unsigned 16 bit LE";
	    case 0:
		return "format not set" ;
            default:
                break ;
        }
        return "ERROR: Unsupported AFMT_XXXX code" ;
}

static int state_open(struct inode *inode, struct file *file)
{
	char *buffer = state.buf;
	int len = 0;
	int ret;

	mutex_lock(&dmasound_core_mutex);
	ret = -EBUSY;
	if (state.busy)
		goto out;

	ret = -ENODEV;
	if (!try_module_get(dmasound.mach.owner))
		goto out;

	state.ptr = 0;
	state.busy = 1;

	len += sprintf(buffer+len, "%sDMA sound driver rev %03d :\n",
		dmasound.mach.name, (DMASOUND_CORE_REVISION<<4) +
		((dmasound.mach.version>>8) & 0x0f));
	len += sprintf(buffer+len,
		"Core driver edition %02d.%02d : %s driver edition %02d.%02d\n",
		DMASOUND_CORE_REVISION, DMASOUND_CORE_EDITION, dmasound.mach.name2,
		(dmasound.mach.version >> 8), (dmasound.mach.version & 0xff)) ;

	/* call the low-level module to fill in any stat info. that it has
	   if present.  Maximum buffer usage is specified.
	*/

	if (dmasound.mach.state_info)
		len += dmasound.mach.state_info(buffer+len,
			(size_t) LOW_LEVEL_STAT_ALLOC) ;

	/* make usage of the state buffer as deterministic as poss.
	   exceptional conditions could cause overrun - and this is flagged as
	   a kernel error.
	*/

	/* formats and settings */

	len += sprintf(buffer+len,"\t\t === Formats & settings ===\n") ;
	len += sprintf(buffer+len,"Parameter %20s%20s\n","soft","hard") ;
	len += sprintf(buffer+len,"Format   :%20s%20s\n",
		get_afmt_string(dmasound.soft.format),
		get_afmt_string(dmasound.hard.format));

	len += sprintf(buffer+len,"Samp Rate:%14d s/sec%14d s/sec\n",
		       dmasound.soft.speed, dmasound.hard.speed);

	len += sprintf(buffer+len,"Channels :%20s%20s\n",
		       dmasound.soft.stereo ? "stereo" : "mono",
		       dmasound.hard.stereo ? "stereo" : "mono" );

	/* sound queue status */

	len += sprintf(buffer+len,"\t\t === Sound Queue status ===\n");
	len += sprintf(buffer+len,"Allocated:%8s%6s\n","Buffers","Size") ;
	len += sprintf(buffer+len,"%9s:%8d%6d\n",
		"write", write_sq.numBufs, write_sq.bufSize) ;
	len += sprintf(buffer+len,
		"Current  : MaxFrg FragSiz MaxAct Frnt Rear "
		"Cnt RrSize A B S L  xruns\n") ;
	len += sprintf(buffer+len,"%9s:%7d%8d%7d%5d%5d%4d%7d%2d%2d%2d%2d%7d\n",
		"write", write_sq.max_count, write_sq.block_size,
		write_sq.max_active, write_sq.front, write_sq.rear,
		write_sq.count, write_sq.rear_size, write_sq.active,
		write_sq.busy, write_sq.syncing, write_sq.locked, write_sq.xruns) ;
#ifdef DEBUG_DMASOUND
printk("dmasound: stat buffer used %d bytes\n", len) ;
#endif

	if (len >= STAT_BUFF_LEN)
		printk(KERN_ERR "dmasound_core: stat buffer overflowed!\n");

	state.len = len;
	ret = 0;
out:
	mutex_unlock(&dmasound_core_mutex);
	return ret;
}

static int state_release(struct inode *inode, struct file *file)
{
	mutex_lock(&dmasound_core_mutex);
	state.busy = 0;
	module_put(dmasound.mach.owner);
	mutex_unlock(&dmasound_core_mutex);
	return 0;
}

static ssize_t state_read(struct file *file, char __user *buf, size_t count,
			  loff_t *ppos)
{
	int n = state.len - state.ptr;
	if (n > count)
		n = count;
	if (n <= 0)
		return 0;
	if (copy_to_user(buf, &state.buf[state.ptr], n))
		return -EFAULT;
	state.ptr += n;
	return n;
}

static const struct file_operations state_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.read		= state_read,
	.open		= state_open,
	.release	= state_release,
};

static int state_init(void)
{
	state_unit = register_sound_special(&state_fops, SND_DEV_STATUS);
	if (state_unit < 0)
		return state_unit ;
	state.busy = 0;
	return 0 ;
}


    /*
     *  Config & Setup
     *
     *  This function is called by _one_ chipset-specific driver
     */

int dmasound_init(void)
{
	int res ;

	if (irq_installed)
		return -EBUSY;

	/* Set up sound queue, /dev/audio and /dev/dsp. */

	/* Set default settings. */
	if ((res = sq_init()) < 0)
		return res ;

	/* Set up /dev/sndstat. */
	if ((res = state_init()) < 0)
		return res ;

	/* Set up /dev/mixer. */
	mixer_init();

	if (!dmasound.mach.irqinit()) {
		printk(KERN_ERR "DMA sound driver: Interrupt initialization failed\n");
		return -ENODEV;
	}
	irq_installed = 1;

	printk(KERN_INFO "%s DMA sound driver rev %03d installed\n",
		dmasound.mach.name, (DMASOUND_CORE_REVISION<<4) +
		((dmasound.mach.version>>8) & 0x0f));
	printk(KERN_INFO
		"Core driver edition %02d.%02d : %s driver edition %02d.%02d\n",
		DMASOUND_CORE_REVISION, DMASOUND_CORE_EDITION, dmasound.mach.name2,
		(dmasound.mach.version >> 8), (dmasound.mach.version & 0xff)) ;
	printk(KERN_INFO "Write will use %4d fragments of %7d bytes as default\n",
		numWriteBufs, writeBufSize) ;
	return 0;
}

void dmasound_deinit(void)
{
	if (irq_installed) {
		sound_silence();
		dmasound.mach.irqcleanup();
		irq_installed = 0;
	}

	write_sq_release_buffers();

	if (mixer_unit >= 0)
		unregister_sound_mixer(mixer_unit);
	if (state_unit >= 0)
		unregister_sound_special(state_unit);
	if (sq_unit >= 0)
		unregister_sound_dsp(sq_unit);
}

static int __maybe_unused dmasound_setup(char *str)
{
	int ints[6], size;

	str = get_options(str, ARRAY_SIZE(ints), ints);

	/* check the bootstrap parameter for "dmasound=" */

	/* FIXME: other than in the most naive of cases there is no sense in these
	 *	  buffers being other than powers of two.  This is not checked yet.
	 */

	switch (ints[0]) {
	case 3:
		if ((ints[3] < 0) || (ints[3] > MAX_CATCH_RADIUS))
			printk("dmasound_setup: invalid catch radius, using default = %d\n", catchRadius);
		else
			catchRadius = ints[3];
		fallthrough;
	case 2:
		if (ints[1] < MIN_BUFFERS)
			printk("dmasound_setup: invalid number of buffers, using default = %d\n", numWriteBufs);
		else
			numWriteBufs = ints[1];
		fallthrough;
	case 1:
		if ((size = ints[2]) < 256) /* check for small buffer specs */
			size <<= 10 ;
                if (size < MIN_BUFSIZE || size > MAX_BUFSIZE)
                        printk("dmasound_setup: invalid write buffer size, using default = %d\n", writeBufSize);
                else
                        writeBufSize = size;
	case 0:
		break;
	default:
		printk("dmasound_setup: invalid number of arguments\n");
		return 0;
	}
	return 1;
}

__setup("dmasound=", dmasound_setup);

    /*
     *  Conversion tables
     */

#ifdef HAS_8BIT_TABLES
/* 8 bit mu-law */

char dmasound_ulaw2dma8[] = {
	-126,	-122,	-118,	-114,	-110,	-106,	-102,	-98,
	-94,	-90,	-86,	-82,	-78,	-74,	-70,	-66,
	-63,	-61,	-59,	-57,	-55,	-53,	-51,	-49,
	-47,	-45,	-43,	-41,	-39,	-37,	-35,	-33,
	-31,	-30,	-29,	-28,	-27,	-26,	-25,	-24,
	-23,	-22,	-21,	-20,	-19,	-18,	-17,	-16,
	-16,	-15,	-15,	-14,	-14,	-13,	-13,	-12,
	-12,	-11,	-11,	-10,	-10,	-9,	-9,	-8,
	-8,	-8,	-7,	-7,	-7,	-7,	-6,	-6,
	-6,	-6,	-5,	-5,	-5,	-5,	-4,	-4,
	-4,	-4,	-4,	-4,	-3,	-3,	-3,	-3,
	-3,	-3,	-3,	-3,	-2,	-2,	-2,	-2,
	-2,	-2,	-2,	-2,	-2,	-2,	-2,	-2,
	-1,	-1,	-1,	-1,	-1,	-1,	-1,	-1,
	-1,	-1,	-1,	-1,	-1,	-1,	-1,	-1,
	-1,	-1,	-1,	-1,	-1,	-1,	-1,	0,
	125,	121,	117,	113,	109,	105,	101,	97,
	93,	89,	85,	81,	77,	73,	69,	65,
	62,	60,	58,	56,	54,	52,	50,	48,
	46,	44,	42,	40,	38,	36,	34,	32,
	30,	29,	28,	27,	26,	25,	24,	23,
	22,	21,	20,	19,	18,	17,	16,	15,
	15,	14,	14,	13,	13,	12,	12,	11,
	11,	10,	10,	9,	9,	8,	8,	7,
	7,	7,	6,	6,	6,	6,	5,	5,
	5,	5,	4,	4,	4,	4,	3,	3,
	3,	3,	3,	3,	2,	2,	2,	2,
	2,	2,	2,	2,	1,	1,	1,	1,
	1,	1,	1,	1,	1,	1,	1,	1,
	0,	0,	0,	0,	0,	0,	0,	0,
	0,	0,	0,	0,	0,	0,	0,	0,
	0,	0,	0,	0,	0,	0,	0,	0
};

/* 8 bit A-law */

char dmasound_alaw2dma8[] = {
	-22,	-21,	-24,	-23,	-18,	-17,	-20,	-19,
	-30,	-29,	-32,	-31,	-26,	-25,	-28,	-27,
	-11,	-11,	-12,	-12,	-9,	-9,	-10,	-10,
	-15,	-15,	-16,	-16,	-13,	-13,	-14,	-14,
	-86,	-82,	-94,	-90,	-70,	-66,	-78,	-74,
	-118,	-114,	-126,	-122,	-102,	-98,	-110,	-106,
	-43,	-41,	-47,	-45,	-35,	-33,	-39,	-37,
	-59,	-57,	-63,	-61,	-51,	-49,	-55,	-53,
	-2,	-2,	-2,	-2,	-2,	-2,	-2,	-2,
	-2,	-2,	-2,	-2,	-2,	-2,	-2,	-2,
	-1,	-1,	-1,	-1,	-1,	-1,	-1,	-1,
	-1,	-1,	-1,	-1,	-1,	-1,	-1,	-1,
	-6,	-6,	-6,	-6,	-5,	-5,	-5,	-5,
	-8,	-8,	-8,	-8,	-7,	-7,	-7,	-7,
	-3,	-3,	-3,	-3,	-3,	-3,	-3,	-3,
	-4,	-4,	-4,	-4,	-4,	-4,	-4,	-4,
	21,	20,	23,	22,	17,	16,	19,	18,
	29,	28,	31,	30,	25,	24,	27,	26,
	10,	10,	11,	11,	8,	8,	9,	9,
	14,	14,	15,	15,	12,	12,	13,	13,
	86,	82,	94,	90,	70,	66,	78,	74,
	118,	114,	126,	122,	102,	98,	110,	106,
	43,	41,	47,	45,	35,	33,	39,	37,
	59,	57,	63,	61,	51,	49,	55,	53,
	1,	1,	1,	1,	1,	1,	1,	1,
	1,	1,	1,	1,	1,	1,	1,	1,
	0,	0,	0,	0,	0,	0,	0,	0,
	0,	0,	0,	0,	0,	0,	0,	0,
	5,	5,	5,	5,	4,	4,	4,	4,
	7,	7,	7,	7,	6,	6,	6,	6,
	2,	2,	2,	2,	2,	2,	2,	2,
	3,	3,	3,	3,	3,	3,	3,	3
};
#endif /* HAS_8BIT_TABLES */

    /*
     *  Visible symbols for modules
     */

EXPORT_SYMBOL(dmasound);
EXPORT_SYMBOL(dmasound_init);
EXPORT_SYMBOL(dmasound_deinit);
EXPORT_SYMBOL(dmasound_write_sq);
EXPORT_SYMBOL(dmasound_catchRadius);
#ifdef HAS_8BIT_TABLES
EXPORT_SYMBOL(dmasound_ulaw2dma8);
EXPORT_SYMBOL(dmasound_alaw2dma8);
#endif