summaryrefslogtreecommitdiff
path: root/sound/hda/hdac_device.c
blob: aa6d6cec238046e86d5bd9656bd1352f42110337 (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
/*
 * HD-audio codec core device
 */

#include <linux/init.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/export.h>
#include <linux/pm_runtime.h>
#include <sound/hdaudio.h>
#include <sound/hda_regmap.h>
#include <sound/pcm.h>
#include "local.h"

static void setup_fg_nodes(struct hdac_device *codec);
static int get_codec_vendor_name(struct hdac_device *codec);

static void default_release(struct device *dev)
{
	snd_hdac_device_exit(container_of(dev, struct hdac_device, dev));
}

/**
 * snd_hdac_device_init - initialize the HD-audio codec base device
 * @codec: device to initialize
 * @bus: but to attach
 * @name: device name string
 * @addr: codec address
 *
 * Returns zero for success or a negative error code.
 *
 * This function increments the runtime PM counter and marks it active.
 * The caller needs to turn it off appropriately later.
 *
 * The caller needs to set the device's release op properly by itself.
 */
int snd_hdac_device_init(struct hdac_device *codec, struct hdac_bus *bus,
			 const char *name, unsigned int addr)
{
	struct device *dev;
	hda_nid_t fg;
	int err;

	dev = &codec->dev;
	device_initialize(dev);
	dev->parent = bus->dev;
	dev->bus = &snd_hda_bus_type;
	dev->release = default_release;
	dev->groups = hdac_dev_attr_groups;
	dev_set_name(dev, "%s", name);
	device_enable_async_suspend(dev);

	codec->bus = bus;
	codec->addr = addr;
	codec->type = HDA_DEV_CORE;
	pm_runtime_set_active(&codec->dev);
	pm_runtime_get_noresume(&codec->dev);
	atomic_set(&codec->in_pm, 0);

	err = snd_hdac_bus_add_device(bus, codec);
	if (err < 0)
		goto error;

	/* fill parameters */
	codec->vendor_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
					      AC_PAR_VENDOR_ID);
	if (codec->vendor_id == -1) {
		/* read again, hopefully the access method was corrected
		 * in the last read...
		 */
		codec->vendor_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
						      AC_PAR_VENDOR_ID);
	}

	codec->subsystem_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
						 AC_PAR_SUBSYSTEM_ID);
	codec->revision_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
						AC_PAR_REV_ID);

	setup_fg_nodes(codec);
	if (!codec->afg && !codec->mfg) {
		dev_err(dev, "no AFG or MFG node found\n");
		err = -ENODEV;
		goto error;
	}

	fg = codec->afg ? codec->afg : codec->mfg;

	err = snd_hdac_refresh_widgets(codec);
	if (err < 0)
		goto error;

	codec->power_caps = snd_hdac_read_parm(codec, fg, AC_PAR_POWER_STATE);
	/* reread ssid if not set by parameter */
	if (codec->subsystem_id == -1 || codec->subsystem_id == 0)
		snd_hdac_read(codec, fg, AC_VERB_GET_SUBSYSTEM_ID, 0,
			      &codec->subsystem_id);

	err = get_codec_vendor_name(codec);
	if (err < 0)
		goto error;

	codec->chip_name = kasprintf(GFP_KERNEL, "ID %x",
				     codec->vendor_id & 0xffff);
	if (!codec->chip_name) {
		err = -ENOMEM;
		goto error;
	}

	return 0;

 error:
	put_device(&codec->dev);
	return err;
}
EXPORT_SYMBOL_GPL(snd_hdac_device_init);

/**
 * snd_hdac_device_exit - clean up the HD-audio codec base device
 * @codec: device to clean up
 */
void snd_hdac_device_exit(struct hdac_device *codec)
{
	pm_runtime_put_noidle(&codec->dev);
	snd_hdac_bus_remove_device(codec->bus, codec);
	kfree(codec->vendor_name);
	kfree(codec->chip_name);
}
EXPORT_SYMBOL_GPL(snd_hdac_device_exit);

/**
 * snd_hdac_device_register - register the hd-audio codec base device
 * codec: the device to register
 */
int snd_hdac_device_register(struct hdac_device *codec)
{
	int err;

	err = device_add(&codec->dev);
	if (err < 0)
		return err;
	err = hda_widget_sysfs_init(codec);
	if (err < 0) {
		device_del(&codec->dev);
		return err;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_device_register);

/**
 * snd_hdac_device_unregister - unregister the hd-audio codec base device
 * codec: the device to unregister
 */
void snd_hdac_device_unregister(struct hdac_device *codec)
{
	if (device_is_registered(&codec->dev)) {
		hda_widget_sysfs_exit(codec);
		device_del(&codec->dev);
	}
}
EXPORT_SYMBOL_GPL(snd_hdac_device_unregister);

/**
 * snd_hdac_make_cmd - compose a 32bit command word to be sent to the
 *	HD-audio controller
 * @codec: the codec object
 * @nid: NID to encode
 * @verb: verb to encode
 * @parm: parameter to encode
 *
 * Return an encoded command verb or -1 for error.
 */
unsigned int snd_hdac_make_cmd(struct hdac_device *codec, hda_nid_t nid,
			       unsigned int verb, unsigned int parm)
{
	u32 val, addr;

	addr = codec->addr;
	if ((addr & ~0xf) || (nid & ~0x7f) ||
	    (verb & ~0xfff) || (parm & ~0xffff)) {
		dev_err(&codec->dev, "out of range cmd %x:%x:%x:%x\n",
			addr, nid, verb, parm);
		return -1;
	}

	val = addr << 28;
	val |= (u32)nid << 20;
	val |= verb << 8;
	val |= parm;
	return val;
}
EXPORT_SYMBOL_GPL(snd_hdac_make_cmd);

/**
 * snd_hdac_exec_verb - execute an encoded verb
 * @codec: the codec object
 * @cmd: encoded verb to execute
 * @flags: optional flags, pass zero for default
 * @res: the pointer to store the result, NULL if running async
 *
 * Returns zero if successful, or a negative error code.
 *
 * This calls the exec_verb op when set in hdac_codec.  If not,
 * call the default snd_hdac_bus_exec_verb().
 */
int snd_hdac_exec_verb(struct hdac_device *codec, unsigned int cmd,
		       unsigned int flags, unsigned int *res)
{
	if (codec->exec_verb)
		return codec->exec_verb(codec, cmd, flags, res);
	return snd_hdac_bus_exec_verb(codec->bus, codec->addr, cmd, res);
}
EXPORT_SYMBOL_GPL(snd_hdac_exec_verb);


/**
 * snd_hdac_read - execute a verb
 * @codec: the codec object
 * @nid: NID to execute a verb
 * @verb: verb to execute
 * @parm: parameter for a verb
 * @res: the pointer to store the result, NULL if running async
 *
 * Returns zero if successful, or a negative error code.
 */
int snd_hdac_read(struct hdac_device *codec, hda_nid_t nid,
		  unsigned int verb, unsigned int parm, unsigned int *res)
{
	unsigned int cmd = snd_hdac_make_cmd(codec, nid, verb, parm);

	return snd_hdac_exec_verb(codec, cmd, 0, res);
}
EXPORT_SYMBOL_GPL(snd_hdac_read);

/**
 * _snd_hdac_read_parm - read a parmeter
 *
 * This function returns zero or an error unlike snd_hdac_read_parm().
 */
int _snd_hdac_read_parm(struct hdac_device *codec, hda_nid_t nid, int parm,
			unsigned int *res)
{
	unsigned int cmd;

	cmd = snd_hdac_regmap_encode_verb(nid, AC_VERB_PARAMETERS) | parm;
	return snd_hdac_regmap_read_raw(codec, cmd, res);
}
EXPORT_SYMBOL_GPL(_snd_hdac_read_parm);

/**
 * snd_hdac_read_parm_uncached - read a codec parameter without caching
 * @codec: the codec object
 * @nid: NID to read a parameter
 * @parm: parameter to read
 *
 * Returns -1 for error.  If you need to distinguish the error more
 * strictly, use snd_hdac_read() directly.
 */
int snd_hdac_read_parm_uncached(struct hdac_device *codec, hda_nid_t nid,
				int parm)
{
	int val;

	if (codec->regmap)
		regcache_cache_bypass(codec->regmap, true);
	val = snd_hdac_read_parm(codec, nid, parm);
	if (codec->regmap)
		regcache_cache_bypass(codec->regmap, false);
	return val;
}
EXPORT_SYMBOL_GPL(snd_hdac_read_parm_uncached);

/**
 * snd_hdac_override_parm - override read-only parameters
 * @codec: the codec object
 * @nid: NID for the parameter
 * @parm: the parameter to change
 * @val: the parameter value to overwrite
 */
int snd_hdac_override_parm(struct hdac_device *codec, hda_nid_t nid,
			   unsigned int parm, unsigned int val)
{
	unsigned int verb = (AC_VERB_PARAMETERS << 8) | (nid << 20) | parm;
	int err;

	if (!codec->regmap)
		return -EINVAL;

	codec->caps_overwriting = true;
	err = snd_hdac_regmap_write_raw(codec, verb, val);
	codec->caps_overwriting = false;
	return err;
}
EXPORT_SYMBOL_GPL(snd_hdac_override_parm);

/**
 * snd_hdac_get_sub_nodes - get start NID and number of subtree nodes
 * @codec: the codec object
 * @nid: NID to inspect
 * @start_id: the pointer to store the starting NID
 *
 * Returns the number of subtree nodes or zero if not found.
 * This function reads parameters always without caching.
 */
int snd_hdac_get_sub_nodes(struct hdac_device *codec, hda_nid_t nid,
			   hda_nid_t *start_id)
{
	unsigned int parm;

	parm = snd_hdac_read_parm_uncached(codec, nid, AC_PAR_NODE_COUNT);
	if (parm == -1) {
		*start_id = 0;
		return 0;
	}
	*start_id = (parm >> 16) & 0x7fff;
	return (int)(parm & 0x7fff);
}
EXPORT_SYMBOL_GPL(snd_hdac_get_sub_nodes);

/*
 * look for an AFG and MFG nodes
 */
static void setup_fg_nodes(struct hdac_device *codec)
{
	int i, total_nodes, function_id;
	hda_nid_t nid;

	total_nodes = snd_hdac_get_sub_nodes(codec, AC_NODE_ROOT, &nid);
	for (i = 0; i < total_nodes; i++, nid++) {
		function_id = snd_hdac_read_parm(codec, nid,
						 AC_PAR_FUNCTION_TYPE);
		switch (function_id & 0xff) {
		case AC_GRP_AUDIO_FUNCTION:
			codec->afg = nid;
			codec->afg_function_id = function_id & 0xff;
			codec->afg_unsol = (function_id >> 8) & 1;
			break;
		case AC_GRP_MODEM_FUNCTION:
			codec->mfg = nid;
			codec->mfg_function_id = function_id & 0xff;
			codec->mfg_unsol = (function_id >> 8) & 1;
			break;
		default:
			break;
		}
	}
}

/**
 * snd_hdac_refresh_widgets - Reset the widget start/end nodes
 * @codec: the codec object
 */
int snd_hdac_refresh_widgets(struct hdac_device *codec)
{
	hda_nid_t start_nid;
	int nums;

	nums = snd_hdac_get_sub_nodes(codec, codec->afg, &start_nid);
	if (!start_nid || nums <= 0 || nums >= 0xff) {
		dev_err(&codec->dev, "cannot read sub nodes for FG 0x%02x\n",
			codec->afg);
		return -EINVAL;
	}

	codec->num_nodes = nums;
	codec->start_nid = start_nid;
	codec->end_nid = start_nid + nums;
	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_refresh_widgets);

/**
 * snd_hdac_refresh_widget_sysfs - Reset the codec widgets and reinit the
 * codec sysfs
 * @codec: the codec object
 *
 * first we need to remove sysfs, then refresh widgets and lastly
 * recreate it
 */
int snd_hdac_refresh_widget_sysfs(struct hdac_device *codec)
{
	int ret;

	hda_widget_sysfs_exit(codec);
	ret = snd_hdac_refresh_widgets(codec);
	if (ret) {
		dev_err(&codec->dev, "failed to refresh widget: %d\n", ret);
		return ret;
	}
	ret = hda_widget_sysfs_init(codec);
	if (ret) {
		dev_err(&codec->dev, "failed to init sysfs: %d\n", ret);
		return ret;
	}

	return ret;
}
EXPORT_SYMBOL_GPL(snd_hdac_refresh_widget_sysfs);

/* return CONNLIST_LEN parameter of the given widget */
static unsigned int get_num_conns(struct hdac_device *codec, hda_nid_t nid)
{
	unsigned int wcaps = get_wcaps(codec, nid);
	unsigned int parm;

	if (!(wcaps & AC_WCAP_CONN_LIST) &&
	    get_wcaps_type(wcaps) != AC_WID_VOL_KNB)
		return 0;

	parm = snd_hdac_read_parm(codec, nid, AC_PAR_CONNLIST_LEN);
	if (parm == -1)
		parm = 0;
	return parm;
}

/**
 * snd_hdac_get_connections - get a widget connection list
 * @codec: the codec object
 * @nid: NID
 * @conn_list: the array to store the results, can be NULL
 * @max_conns: the max size of the given array
 *
 * Returns the number of connected widgets, zero for no connection, or a
 * negative error code.  When the number of elements don't fit with the
 * given array size, it returns -ENOSPC.
 *
 * When @conn_list is NULL, it just checks the number of connections.
 */
int snd_hdac_get_connections(struct hdac_device *codec, hda_nid_t nid,
			     hda_nid_t *conn_list, int max_conns)
{
	unsigned int parm;
	int i, conn_len, conns, err;
	unsigned int shift, num_elems, mask;
	hda_nid_t prev_nid;
	int null_count = 0;

	parm = get_num_conns(codec, nid);
	if (!parm)
		return 0;

	if (parm & AC_CLIST_LONG) {
		/* long form */
		shift = 16;
		num_elems = 2;
	} else {
		/* short form */
		shift = 8;
		num_elems = 4;
	}
	conn_len = parm & AC_CLIST_LENGTH;
	mask = (1 << (shift-1)) - 1;

	if (!conn_len)
		return 0; /* no connection */

	if (conn_len == 1) {
		/* single connection */
		err = snd_hdac_read(codec, nid, AC_VERB_GET_CONNECT_LIST, 0,
				    &parm);
		if (err < 0)
			return err;
		if (conn_list)
			conn_list[0] = parm & mask;
		return 1;
	}

	/* multi connection */
	conns = 0;
	prev_nid = 0;
	for (i = 0; i < conn_len; i++) {
		int range_val;
		hda_nid_t val, n;

		if (i % num_elems == 0) {
			err = snd_hdac_read(codec, nid,
					    AC_VERB_GET_CONNECT_LIST, i,
					    &parm);
			if (err < 0)
				return -EIO;
		}
		range_val = !!(parm & (1 << (shift-1))); /* ranges */
		val = parm & mask;
		if (val == 0 && null_count++) {  /* no second chance */
			dev_dbg(&codec->dev,
				"invalid CONNECT_LIST verb %x[%i]:%x\n",
				nid, i, parm);
			return 0;
		}
		parm >>= shift;
		if (range_val) {
			/* ranges between the previous and this one */
			if (!prev_nid || prev_nid >= val) {
				dev_warn(&codec->dev,
					 "invalid dep_range_val %x:%x\n",
					 prev_nid, val);
				continue;
			}
			for (n = prev_nid + 1; n <= val; n++) {
				if (conn_list) {
					if (conns >= max_conns)
						return -ENOSPC;
					conn_list[conns] = n;
				}
				conns++;
			}
		} else {
			if (conn_list) {
				if (conns >= max_conns)
					return -ENOSPC;
				conn_list[conns] = val;
			}
			conns++;
		}
		prev_nid = val;
	}
	return conns;
}
EXPORT_SYMBOL_GPL(snd_hdac_get_connections);

#ifdef CONFIG_PM
/**
 * snd_hdac_power_up - power up the codec
 * @codec: the codec object
 *
 * This function calls the runtime PM helper to power up the given codec.
 * Unlike snd_hdac_power_up_pm(), you should call this only for the code
 * path that isn't included in PM path.  Otherwise it gets stuck.
 *
 * Returns zero if successful, or a negative error code.
 */
int snd_hdac_power_up(struct hdac_device *codec)
{
	return pm_runtime_get_sync(&codec->dev);
}
EXPORT_SYMBOL_GPL(snd_hdac_power_up);

/**
 * snd_hdac_power_down - power down the codec
 * @codec: the codec object
 *
 * Returns zero if successful, or a negative error code.
 */
int snd_hdac_power_down(struct hdac_device *codec)
{
	struct device *dev = &codec->dev;

	pm_runtime_mark_last_busy(dev);
	return pm_runtime_put_autosuspend(dev);
}
EXPORT_SYMBOL_GPL(snd_hdac_power_down);

/**
 * snd_hdac_power_up_pm - power up the codec
 * @codec: the codec object
 *
 * This function can be called in a recursive code path like init code
 * which may be called by PM suspend/resume again.  OTOH, if a power-up
 * call must wake up the sleeper (e.g. in a kctl callback), use
 * snd_hdac_power_up() instead.
 *
 * Returns zero if successful, or a negative error code.
 */
int snd_hdac_power_up_pm(struct hdac_device *codec)
{
	if (!atomic_inc_not_zero(&codec->in_pm))
		return snd_hdac_power_up(codec);
	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_power_up_pm);

/**
 * snd_hdac_power_down_pm - power down the codec
 * @codec: the codec object
 *
 * Like snd_hdac_power_up_pm(), this function is used in a recursive
 * code path like init code which may be called by PM suspend/resume again.
 *
 * Returns zero if successful, or a negative error code.
 */
int snd_hdac_power_down_pm(struct hdac_device *codec)
{
	if (atomic_dec_if_positive(&codec->in_pm) < 0)
		return snd_hdac_power_down(codec);
	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_power_down_pm);
#endif

/*
 * Enable/disable the link power for a codec.
 */
int snd_hdac_link_power(struct hdac_device *codec, bool enable)
{
	if  (!codec->link_power_control)
		return 0;

	if  (codec->bus->ops->link_power)
		return codec->bus->ops->link_power(codec->bus, enable);
	else
		return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_hdac_link_power);

/* codec vendor labels */
struct hda_vendor_id {
	unsigned int id;
	const char *name;
};

static struct hda_vendor_id hda_vendor_ids[] = {
	{ 0x1002, "ATI" },
	{ 0x1013, "Cirrus Logic" },
	{ 0x1057, "Motorola" },
	{ 0x1095, "Silicon Image" },
	{ 0x10de, "Nvidia" },
	{ 0x10ec, "Realtek" },
	{ 0x1102, "Creative" },
	{ 0x1106, "VIA" },
	{ 0x111d, "IDT" },
	{ 0x11c1, "LSI" },
	{ 0x11d4, "Analog Devices" },
	{ 0x13f6, "C-Media" },
	{ 0x14f1, "Conexant" },
	{ 0x17e8, "Chrontel" },
	{ 0x1854, "LG" },
	{ 0x1aec, "Wolfson Microelectronics" },
	{ 0x1af4, "QEMU" },
	{ 0x434d, "C-Media" },
	{ 0x8086, "Intel" },
	{ 0x8384, "SigmaTel" },
	{} /* terminator */
};

/* store the codec vendor name */
static int get_codec_vendor_name(struct hdac_device *codec)
{
	const struct hda_vendor_id *c;
	u16 vendor_id = codec->vendor_id >> 16;

	for (c = hda_vendor_ids; c->id; c++) {
		if (c->id == vendor_id) {
			codec->vendor_name = kstrdup(c->name, GFP_KERNEL);
			return codec->vendor_name ? 0 : -ENOMEM;
		}
	}

	codec->vendor_name = kasprintf(GFP_KERNEL, "Generic %04x", vendor_id);
	return codec->vendor_name ? 0 : -ENOMEM;
}

/*
 * stream formats
 */
struct hda_rate_tbl {
	unsigned int hz;
	unsigned int alsa_bits;
	unsigned int hda_fmt;
};

/* rate = base * mult / div */
#define HDA_RATE(base, mult, div) \
	(AC_FMT_BASE_##base##K | (((mult) - 1) << AC_FMT_MULT_SHIFT) | \
	 (((div) - 1) << AC_FMT_DIV_SHIFT))

static struct hda_rate_tbl rate_bits[] = {
	/* rate in Hz, ALSA rate bitmask, HDA format value */

	/* autodetected value used in snd_hda_query_supported_pcm */
	{ 8000, SNDRV_PCM_RATE_8000, HDA_RATE(48, 1, 6) },
	{ 11025, SNDRV_PCM_RATE_11025, HDA_RATE(44, 1, 4) },
	{ 16000, SNDRV_PCM_RATE_16000, HDA_RATE(48, 1, 3) },
	{ 22050, SNDRV_PCM_RATE_22050, HDA_RATE(44, 1, 2) },
	{ 32000, SNDRV_PCM_RATE_32000, HDA_RATE(48, 2, 3) },
	{ 44100, SNDRV_PCM_RATE_44100, HDA_RATE(44, 1, 1) },
	{ 48000, SNDRV_PCM_RATE_48000, HDA_RATE(48, 1, 1) },
	{ 88200, SNDRV_PCM_RATE_88200, HDA_RATE(44, 2, 1) },
	{ 96000, SNDRV_PCM_RATE_96000, HDA_RATE(48, 2, 1) },
	{ 176400, SNDRV_PCM_RATE_176400, HDA_RATE(44, 4, 1) },
	{ 192000, SNDRV_PCM_RATE_192000, HDA_RATE(48, 4, 1) },
#define AC_PAR_PCM_RATE_BITS	11
	/* up to bits 10, 384kHZ isn't supported properly */

	/* not autodetected value */
	{ 9600, SNDRV_PCM_RATE_KNOT, HDA_RATE(48, 1, 5) },

	{ 0 } /* terminator */
};

/**
 * snd_hdac_calc_stream_format - calculate the format bitset
 * @rate: the sample rate
 * @channels: the number of channels
 * @format: the PCM format (SNDRV_PCM_FORMAT_XXX)
 * @maxbps: the max. bps
 * @spdif_ctls: HD-audio SPDIF status bits (0 if irrelevant)
 *
 * Calculate the format bitset from the given rate, channels and th PCM format.
 *
 * Return zero if invalid.
 */
unsigned int snd_hdac_calc_stream_format(unsigned int rate,
					 unsigned int channels,
					 unsigned int format,
					 unsigned int maxbps,
					 unsigned short spdif_ctls)
{
	int i;
	unsigned int val = 0;

	for (i = 0; rate_bits[i].hz; i++)
		if (rate_bits[i].hz == rate) {
			val = rate_bits[i].hda_fmt;
			break;
		}
	if (!rate_bits[i].hz)
		return 0;

	if (channels == 0 || channels > 8)
		return 0;
	val |= channels - 1;

	switch (snd_pcm_format_width(format)) {
	case 8:
		val |= AC_FMT_BITS_8;
		break;
	case 16:
		val |= AC_FMT_BITS_16;
		break;
	case 20:
	case 24:
	case 32:
		if (maxbps >= 32 || format == SNDRV_PCM_FORMAT_FLOAT_LE)
			val |= AC_FMT_BITS_32;
		else if (maxbps >= 24)
			val |= AC_FMT_BITS_24;
		else
			val |= AC_FMT_BITS_20;
		break;
	default:
		return 0;
	}

	if (spdif_ctls & AC_DIG1_NONAUDIO)
		val |= AC_FMT_TYPE_NON_PCM;

	return val;
}
EXPORT_SYMBOL_GPL(snd_hdac_calc_stream_format);

static unsigned int query_pcm_param(struct hdac_device *codec, hda_nid_t nid)
{
	unsigned int val = 0;

	if (nid != codec->afg &&
	    (get_wcaps(codec, nid) & AC_WCAP_FORMAT_OVRD))
		val = snd_hdac_read_parm(codec, nid, AC_PAR_PCM);
	if (!val || val == -1)
		val = snd_hdac_read_parm(codec, codec->afg, AC_PAR_PCM);
	if (!val || val == -1)
		return 0;
	return val;
}

static unsigned int query_stream_param(struct hdac_device *codec, hda_nid_t nid)
{
	unsigned int streams = snd_hdac_read_parm(codec, nid, AC_PAR_STREAM);

	if (!streams || streams == -1)
		streams = snd_hdac_read_parm(codec, codec->afg, AC_PAR_STREAM);
	if (!streams || streams == -1)
		return 0;
	return streams;
}

/**
 * snd_hdac_query_supported_pcm - query the supported PCM rates and formats
 * @codec: the codec object
 * @nid: NID to query
 * @ratesp: the pointer to store the detected rate bitflags
 * @formatsp: the pointer to store the detected formats
 * @bpsp: the pointer to store the detected format widths
 *
 * Queries the supported PCM rates and formats.  The NULL @ratesp, @formatsp
 * or @bsps argument is ignored.
 *
 * Returns 0 if successful, otherwise a negative error code.
 */
int snd_hdac_query_supported_pcm(struct hdac_device *codec, hda_nid_t nid,
				 u32 *ratesp, u64 *formatsp, unsigned int *bpsp)
{
	unsigned int i, val, wcaps;

	wcaps = get_wcaps(codec, nid);
	val = query_pcm_param(codec, nid);

	if (ratesp) {
		u32 rates = 0;
		for (i = 0; i < AC_PAR_PCM_RATE_BITS; i++) {
			if (val & (1 << i))
				rates |= rate_bits[i].alsa_bits;
		}
		if (rates == 0) {
			dev_err(&codec->dev,
				"rates == 0 (nid=0x%x, val=0x%x, ovrd=%i)\n",
				nid, val,
				(wcaps & AC_WCAP_FORMAT_OVRD) ? 1 : 0);
			return -EIO;
		}
		*ratesp = rates;
	}

	if (formatsp || bpsp) {
		u64 formats = 0;
		unsigned int streams, bps;

		streams = query_stream_param(codec, nid);
		if (!streams)
			return -EIO;

		bps = 0;
		if (streams & AC_SUPFMT_PCM) {
			if (val & AC_SUPPCM_BITS_8) {
				formats |= SNDRV_PCM_FMTBIT_U8;
				bps = 8;
			}
			if (val & AC_SUPPCM_BITS_16) {
				formats |= SNDRV_PCM_FMTBIT_S16_LE;
				bps = 16;
			}
			if (wcaps & AC_WCAP_DIGITAL) {
				if (val & AC_SUPPCM_BITS_32)
					formats |= SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE;
				if (val & (AC_SUPPCM_BITS_20|AC_SUPPCM_BITS_24))
					formats |= SNDRV_PCM_FMTBIT_S32_LE;
				if (val & AC_SUPPCM_BITS_24)
					bps = 24;
				else if (val & AC_SUPPCM_BITS_20)
					bps = 20;
			} else if (val & (AC_SUPPCM_BITS_20|AC_SUPPCM_BITS_24|
					  AC_SUPPCM_BITS_32)) {
				formats |= SNDRV_PCM_FMTBIT_S32_LE;
				if (val & AC_SUPPCM_BITS_32)
					bps = 32;
				else if (val & AC_SUPPCM_BITS_24)
					bps = 24;
				else if (val & AC_SUPPCM_BITS_20)
					bps = 20;
			}
		}
#if 0 /* FIXME: CS4206 doesn't work, which is the only codec supporting float */
		if (streams & AC_SUPFMT_FLOAT32) {
			formats |= SNDRV_PCM_FMTBIT_FLOAT_LE;
			if (!bps)
				bps = 32;
		}
#endif
		if (streams == AC_SUPFMT_AC3) {
			/* should be exclusive */
			/* temporary hack: we have still no proper support
			 * for the direct AC3 stream...
			 */
			formats |= SNDRV_PCM_FMTBIT_U8;
			bps = 8;
		}
		if (formats == 0) {
			dev_err(&codec->dev,
				"formats == 0 (nid=0x%x, val=0x%x, ovrd=%i, streams=0x%x)\n",
				nid, val,
				(wcaps & AC_WCAP_FORMAT_OVRD) ? 1 : 0,
				streams);
			return -EIO;
		}
		if (formatsp)
			*formatsp = formats;
		if (bpsp)
			*bpsp = bps;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_query_supported_pcm);

/**
 * snd_hdac_is_supported_format - Check the validity of the format
 * @codec: the codec object
 * @nid: NID to check
 * @format: the HD-audio format value to check
 *
 * Check whether the given node supports the format value.
 *
 * Returns true if supported, false if not.
 */
bool snd_hdac_is_supported_format(struct hdac_device *codec, hda_nid_t nid,
				  unsigned int format)
{
	int i;
	unsigned int val = 0, rate, stream;

	val = query_pcm_param(codec, nid);
	if (!val)
		return false;

	rate = format & 0xff00;
	for (i = 0; i < AC_PAR_PCM_RATE_BITS; i++)
		if (rate_bits[i].hda_fmt == rate) {
			if (val & (1 << i))
				break;
			return false;
		}
	if (i >= AC_PAR_PCM_RATE_BITS)
		return false;

	stream = query_stream_param(codec, nid);
	if (!stream)
		return false;

	if (stream & AC_SUPFMT_PCM) {
		switch (format & 0xf0) {
		case 0x00:
			if (!(val & AC_SUPPCM_BITS_8))
				return false;
			break;
		case 0x10:
			if (!(val & AC_SUPPCM_BITS_16))
				return false;
			break;
		case 0x20:
			if (!(val & AC_SUPPCM_BITS_20))
				return false;
			break;
		case 0x30:
			if (!(val & AC_SUPPCM_BITS_24))
				return false;
			break;
		case 0x40:
			if (!(val & AC_SUPPCM_BITS_32))
				return false;
			break;
		default:
			return false;
		}
	} else {
		/* FIXME: check for float32 and AC3? */
	}

	return true;
}
EXPORT_SYMBOL_GPL(snd_hdac_is_supported_format);