aboutsummaryrefslogtreecommitdiff
path: root/sound/pci/hda/hda_generic.c
blob: 1229227af5b5f4c98bfa2e1a998817cfb27c5471 (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
/*
 * Universal Interface for Intel High Definition Audio Codec
 *
 * Generic widget tree parser
 *
 * Copyright (c) 2004 Takashi Iwai <tiwai@suse.de>
 *
 *  This driver 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 driver 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 <sound/driver.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <sound/core.h>
#include "hda_codec.h"
#include "hda_local.h"

/* widget node for parsing */
struct hda_gnode {
	hda_nid_t nid;		/* NID of this widget */
	unsigned short nconns;	/* number of input connections */
	hda_nid_t conn_list[HDA_MAX_CONNECTIONS]; /* input connections */
	unsigned int wid_caps;	/* widget capabilities */
	unsigned char type;	/* widget type */
	unsigned char pin_ctl;	/* pin controls */
	unsigned char checked;	/* the flag indicates that the node is already parsed */
	unsigned int pin_caps;	/* pin widget capabilities */
	unsigned int def_cfg;	/* default configuration */
	unsigned int amp_out_caps;	/* AMP out capabilities */
	unsigned int amp_in_caps;	/* AMP in capabilities */
	struct list_head list;
};

/* patch-specific record */
struct hda_gspec {
	struct hda_gnode *dac_node;	/* DAC node */
	struct hda_gnode *out_pin_node;	/* Output pin (Line-Out) node */
	struct hda_gnode *pcm_vol_node;	/* Node for PCM volume */
	unsigned int pcm_vol_index;	/* connection of PCM volume */

	struct hda_gnode *adc_node;	/* ADC node */
	struct hda_gnode *cap_vol_node;	/* Node for capture volume */
	unsigned int cur_cap_src;	/* current capture source */
	struct hda_input_mux input_mux;
	char cap_labels[HDA_MAX_NUM_INPUTS][16];

	unsigned int def_amp_in_caps;
	unsigned int def_amp_out_caps;

	struct hda_pcm pcm_rec;		/* PCM information */

	struct list_head nid_list;	/* list of widgets */
};

/*
 * retrieve the default device type from the default config value
 */
#define defcfg_type(node) (((node)->def_cfg & AC_DEFCFG_DEVICE) >> AC_DEFCFG_DEVICE_SHIFT)
#define defcfg_location(node) (((node)->def_cfg & AC_DEFCFG_LOCATION) >> AC_DEFCFG_LOCATION_SHIFT)

/*
 * destructor
 */
static void snd_hda_generic_free(struct hda_codec *codec)
{
	struct hda_gspec *spec = codec->spec;
	struct list_head *p, *n;

	if (! spec)
		return;
	/* free all widgets */
	list_for_each_safe(p, n, &spec->nid_list) {
		struct hda_gnode *node = list_entry(p, struct hda_gnode, list);
		kfree(node);
	}
	kfree(spec);
}


/*
 * add a new widget node and read its attributes
 */
static int add_new_node(struct hda_codec *codec, struct hda_gspec *spec, hda_nid_t nid)
{
	struct hda_gnode *node;
	int nconns;

	node = kcalloc(1, sizeof(*node), GFP_KERNEL);
	if (node == NULL)
		return -ENOMEM;
	node->nid = nid;
	nconns = snd_hda_get_connections(codec, nid, node->conn_list, HDA_MAX_CONNECTIONS);
	if (nconns < 0) {
		kfree(node);
		return nconns;
	}
	node->nconns = nconns;
	node->wid_caps = snd_hda_param_read(codec, nid, AC_PAR_AUDIO_WIDGET_CAP);
	node->type = (node->wid_caps & AC_WCAP_TYPE) >> AC_WCAP_TYPE_SHIFT;

	if (node->type == AC_WID_PIN) {
		node->pin_caps = snd_hda_param_read(codec, node->nid, AC_PAR_PIN_CAP);
		node->pin_ctl = snd_hda_codec_read(codec, node->nid, 0, AC_VERB_GET_PIN_WIDGET_CONTROL, 0);
		node->def_cfg = snd_hda_codec_read(codec, node->nid, 0, AC_VERB_GET_CONFIG_DEFAULT, 0);
	}

	if (node->wid_caps & AC_WCAP_OUT_AMP) {
		if (node->wid_caps & AC_WCAP_AMP_OVRD)
			node->amp_out_caps = snd_hda_param_read(codec, node->nid, AC_PAR_AMP_OUT_CAP);
		if (! node->amp_out_caps)
			node->amp_out_caps = spec->def_amp_out_caps;
	}
	if (node->wid_caps & AC_WCAP_IN_AMP) {
		if (node->wid_caps & AC_WCAP_AMP_OVRD)
			node->amp_in_caps = snd_hda_param_read(codec, node->nid, AC_PAR_AMP_IN_CAP);
		if (! node->amp_in_caps)
			node->amp_in_caps = spec->def_amp_in_caps;
	}
	list_add_tail(&node->list, &spec->nid_list);
	return 0;
}

/*
 * build the AFG subtree
 */
static int build_afg_tree(struct hda_codec *codec)
{
	struct hda_gspec *spec = codec->spec;
	int i, nodes, err;
	hda_nid_t nid;

	snd_assert(spec, return -EINVAL);

	spec->def_amp_out_caps = snd_hda_param_read(codec, codec->afg, AC_PAR_AMP_OUT_CAP);
	spec->def_amp_in_caps = snd_hda_param_read(codec, codec->afg, AC_PAR_AMP_IN_CAP);

	nodes = snd_hda_get_sub_nodes(codec, codec->afg, &nid);
	if (! nid || nodes < 0) {
		printk(KERN_ERR "Invalid AFG subtree\n");
		return -EINVAL;
	}

	/* parse all nodes belonging to the AFG */
	for (i = 0; i < nodes; i++, nid++) {
		if ((err = add_new_node(codec, spec, nid)) < 0)
			return err;
	}

	return 0;
}


/*
 * look for the node record for the given NID
 */
/* FIXME: should avoid the braindead linear search */
static struct hda_gnode *hda_get_node(struct hda_gspec *spec, hda_nid_t nid)
{
	struct list_head *p;
	struct hda_gnode *node;

	list_for_each(p, &spec->nid_list) {
		node = list_entry(p, struct hda_gnode, list);
		if (node->nid == nid)
			return node;
	}
	return NULL;
}

/*
 * unmute (and set max vol) the output amplifier
 */
static int unmute_output(struct hda_codec *codec, struct hda_gnode *node)
{
	unsigned int val, ofs;
	snd_printdd("UNMUTE OUT: NID=0x%x\n", node->nid);
	val = (node->amp_out_caps & AC_AMPCAP_NUM_STEPS) >> AC_AMPCAP_NUM_STEPS_SHIFT;
	ofs = (node->amp_out_caps & AC_AMPCAP_OFFSET) >> AC_AMPCAP_OFFSET_SHIFT;
	if (val >= ofs)
		val -= ofs;
	val |= AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT;
	val |= AC_AMP_SET_OUTPUT;
	return snd_hda_codec_write(codec, node->nid, 0, AC_VERB_SET_AMP_GAIN_MUTE, val);
}

/*
 * unmute (and set max vol) the input amplifier
 */
static int unmute_input(struct hda_codec *codec, struct hda_gnode *node, unsigned int index)
{
	unsigned int val, ofs;
	snd_printdd("UNMUTE IN: NID=0x%x IDX=0x%x\n", node->nid, index);
	val = (node->amp_in_caps & AC_AMPCAP_NUM_STEPS) >> AC_AMPCAP_NUM_STEPS_SHIFT;
	ofs = (node->amp_in_caps & AC_AMPCAP_OFFSET) >> AC_AMPCAP_OFFSET_SHIFT;
	if (val >= ofs)
		val -= ofs;
	val |= AC_AMP_SET_LEFT | AC_AMP_SET_RIGHT;
	val |= AC_AMP_SET_INPUT;
	// awk added - fixed to allow unmuting of indexed amps
	val |= index << AC_AMP_SET_INDEX_SHIFT;
	return snd_hda_codec_write(codec, node->nid, 0, AC_VERB_SET_AMP_GAIN_MUTE, val);
}

/*
 * select the input connection of the given node.
 */
static int select_input_connection(struct hda_codec *codec, struct hda_gnode *node,
				   unsigned int index)
{
	snd_printdd("CONNECT: NID=0x%x IDX=0x%x\n", node->nid, index);
	return snd_hda_codec_write(codec, node->nid, 0, AC_VERB_SET_CONNECT_SEL, index);
}

/*
 * clear checked flag of each node in the node list
 */
static void clear_check_flags(struct hda_gspec *spec)
{
	struct list_head *p;
	struct hda_gnode *node;

	list_for_each(p, &spec->nid_list) {
		node = list_entry(p, struct hda_gnode, list);
		node->checked = 0;
	}
}

/*
 * parse the output path recursively until reach to an audio output widget
 *
 * returns 0 if not found, 1 if found, or a negative error code.
 */
static int parse_output_path(struct hda_codec *codec, struct hda_gspec *spec,
			     struct hda_gnode *node)
{
	int i, err;
	struct hda_gnode *child;

	if (node->checked)
		return 0;

	node->checked = 1;
	if (node->type == AC_WID_AUD_OUT) {
		if (node->wid_caps & AC_WCAP_DIGITAL) {
			snd_printdd("Skip Digital OUT node %x\n", node->nid);
			return 0;
		}
		snd_printdd("AUD_OUT found %x\n", node->nid);
		if (spec->dac_node) {
			/* already DAC node is assigned, just unmute & connect */
			return node == spec->dac_node;
		}
		spec->dac_node = node;
		if (node->wid_caps & AC_WCAP_OUT_AMP) {
			spec->pcm_vol_node = node;
			spec->pcm_vol_index = 0;
		}
		return 1; /* found */
	}

	for (i = 0; i < node->nconns; i++) {
		child = hda_get_node(spec, node->conn_list[i]);
		if (! child)
			continue;
		err = parse_output_path(codec, spec, child);
		if (err < 0)
			return err;
		else if (err > 0) {
			/* found one,
			 * select the path, unmute both input and output
			 */
			if (node->nconns > 1)
				select_input_connection(codec, node, i);
			unmute_input(codec, node, i);
			unmute_output(codec, node);
			if (! spec->pcm_vol_node) {
				if (node->wid_caps & AC_WCAP_IN_AMP) {
					spec->pcm_vol_node = node;
					spec->pcm_vol_index = i;
				} else if (node->wid_caps & AC_WCAP_OUT_AMP) {
					spec->pcm_vol_node = node;
					spec->pcm_vol_index = 0;
				}
			}
			return 1;
		}
	}
	return 0;
}

/*
 * Look for the output PIN widget with the given jack type
 * and parse the output path to that PIN.
 *
 * Returns the PIN node when the path to DAC is established.
 */
static struct hda_gnode *parse_output_jack(struct hda_codec *codec,
					   struct hda_gspec *spec,
					   int jack_type)
{
	struct list_head *p;
	struct hda_gnode *node;
	int err;

	list_for_each(p, &spec->nid_list) {
		node = list_entry(p, struct hda_gnode, list);
		if (node->type != AC_WID_PIN)
			continue;
		/* output capable? */
		if (! (node->pin_caps & AC_PINCAP_OUT))
			continue;
		if (jack_type >= 0) {
			if (jack_type != defcfg_type(node))
				continue;
			if (node->wid_caps & AC_WCAP_DIGITAL)
				continue; /* skip SPDIF */
		} else {
			/* output as default? */
			if (! (node->pin_ctl & AC_PINCTL_OUT_EN))
				continue;
		}
		clear_check_flags(spec);
		err = parse_output_path(codec, spec, node);
		if (err < 0)
			return NULL;
		else if (err > 0) {
			/* unmute the PIN output */
			unmute_output(codec, node);
			/* set PIN-Out enable */
			snd_hda_codec_write(codec, node->nid, 0,
					    AC_VERB_SET_PIN_WIDGET_CONTROL,
					    AC_PINCTL_OUT_EN | AC_PINCTL_HP_EN);
			return node;
		}
	}
	return NULL;
}


/*
 * parse outputs
 */
static int parse_output(struct hda_codec *codec)
{
	struct hda_gspec *spec = codec->spec;
	struct hda_gnode *node;

	/*
	 * Look for the output PIN widget
	 */
	/* first, look for the line-out pin */
	node = parse_output_jack(codec, spec, AC_JACK_LINE_OUT);
	if (node) /* found, remember the PIN node */
		spec->out_pin_node = node;
	/* look for the HP-out pin */
	node = parse_output_jack(codec, spec, AC_JACK_HP_OUT);
	if (node) {
		if (! spec->out_pin_node)
			spec->out_pin_node = node;
	}

	if (! spec->out_pin_node) {
		/* no line-out or HP pins found,
		 * then choose for the first output pin
		 */
		spec->out_pin_node = parse_output_jack(codec, spec, -1);
		if (! spec->out_pin_node)
			snd_printd("hda_generic: no proper output path found\n");
	}

	return 0;
}

/*
 * input MUX
 */

/* control callbacks */
static int capture_source_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
{
	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
	struct hda_gspec *spec = codec->spec;
	return snd_hda_input_mux_info(&spec->input_mux, uinfo);
}

static int capture_source_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
	struct hda_gspec *spec = codec->spec;

	ucontrol->value.enumerated.item[0] = spec->cur_cap_src;
	return 0;
}

static int capture_source_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
	struct hda_gspec *spec = codec->spec;
	return snd_hda_input_mux_put(codec, &spec->input_mux, ucontrol,
				     spec->adc_node->nid, &spec->cur_cap_src);
}

/*
 * return the string name of the given input PIN widget
 */
static const char *get_input_type(struct hda_gnode *node, unsigned int *pinctl)
{
	unsigned int location = defcfg_location(node);
	switch (defcfg_type(node)) {
	case AC_JACK_LINE_IN:
		if ((location & 0x0f) == AC_JACK_LOC_FRONT)
			return "Front Line";
		return "Line";
	case AC_JACK_CD:
		if (pinctl)
			*pinctl |= AC_PINCTL_VREF_GRD;
		return "CD";
	case AC_JACK_AUX:
		if ((location & 0x0f) == AC_JACK_LOC_FRONT)
			return "Front Aux";
		return "Aux";
	case AC_JACK_MIC_IN:
		if ((location & 0x0f) == AC_JACK_LOC_FRONT)
			return "Front Mic";
		return "Mic";
	case AC_JACK_SPDIF_IN:
		return "SPDIF";
	case AC_JACK_DIG_OTHER_IN:
		return "Digital";
	}
	return NULL;
}

/*
 * parse the nodes recursively until reach to the input PIN
 *
 * returns 0 if not found, 1 if found, or a negative error code.
 */
static int parse_adc_sub_nodes(struct hda_codec *codec, struct hda_gspec *spec,
			       struct hda_gnode *node)
{
	int i, err;
	unsigned int pinctl;
	char *label;
	const char *type;

	if (node->checked)
		return 0;

	node->checked = 1;
	if (node->type != AC_WID_PIN) {
		for (i = 0; i < node->nconns; i++) {
			struct hda_gnode *child;
			child = hda_get_node(spec, node->conn_list[i]);
			if (! child)
				continue;
			err = parse_adc_sub_nodes(codec, spec, child);
			if (err < 0)
				return err;
			if (err > 0) {
				/* found one,
				 * select the path, unmute both input and output
				 */
				if (node->nconns > 1)
					select_input_connection(codec, node, i);
				unmute_input(codec, node, i);
				unmute_output(codec, node);
				return err;
			}
		}
		return 0;
	}

	/* input capable? */
	if (! (node->pin_caps & AC_PINCAP_IN))
		return 0;

	if (node->wid_caps & AC_WCAP_DIGITAL)
		return 0; /* skip SPDIF */

	if (spec->input_mux.num_items >= HDA_MAX_NUM_INPUTS) {
		snd_printk(KERN_ERR "hda_generic: Too many items for capture\n");
		return -EINVAL;
	}

	pinctl = AC_PINCTL_IN_EN;
	/* create a proper capture source label */
	type = get_input_type(node, &pinctl);
	if (! type) {
		/* input as default? */
		if (! (node->pin_ctl & AC_PINCTL_IN_EN))
			return 0;
		type = "Input";
	}
	label = spec->cap_labels[spec->input_mux.num_items];
	strcpy(label, type);
	spec->input_mux.items[spec->input_mux.num_items].label = label;

	/* unmute the PIN external input */
	unmute_input(codec, node, 0); /* index = 0? */
	/* set PIN-In enable */
	snd_hda_codec_write(codec, node->nid, 0, AC_VERB_SET_PIN_WIDGET_CONTROL, pinctl);

	return 1; /* found */
}

/*
 * parse input
 */
static int parse_input_path(struct hda_codec *codec, struct hda_gnode *adc_node)
{
	struct hda_gspec *spec = codec->spec;
	struct hda_gnode *node;
	int i, err;

	snd_printdd("AUD_IN = %x\n", adc_node->nid);
	clear_check_flags(spec);

	// awk added - fixed no recording due to muted widget
	unmute_input(codec, adc_node, 0);
	
	/*
	 * check each connection of the ADC
	 * if it reaches to a proper input PIN, add the path as the
	 * input path.
	 */
	for (i = 0; i < adc_node->nconns; i++) {
		node = hda_get_node(spec, adc_node->conn_list[i]);
		if (! node)
			continue;
		err = parse_adc_sub_nodes(codec, spec, node);
		if (err < 0)
			return err;
		else if (err > 0) {
			struct hda_input_mux_item *csrc = &spec->input_mux.items[spec->input_mux.num_items];
			char *buf = spec->cap_labels[spec->input_mux.num_items];
			int ocap;
			for (ocap = 0; ocap < spec->input_mux.num_items; ocap++) {
				if (! strcmp(buf, spec->cap_labels[ocap])) {
					/* same label already exists,
					 * put the index number to be unique
					 */
					sprintf(buf, "%s %d", spec->cap_labels[ocap],
						spec->input_mux.num_items);
				}
			}
			csrc->index = i;
			spec->input_mux.num_items++;
		}
	}

	if (! spec->input_mux.num_items)
		return 0; /* no input path found... */

	snd_printdd("[Capture Source] NID=0x%x, #SRC=%d\n", adc_node->nid, spec->input_mux.num_items);
	for (i = 0; i < spec->input_mux.num_items; i++)
		snd_printdd("  [%s] IDX=0x%x\n", spec->input_mux.items[i].label,
			    spec->input_mux.items[i].index);

	spec->adc_node = adc_node;
	return 1;
}

/*
 * parse input
 */
static int parse_input(struct hda_codec *codec)
{
	struct hda_gspec *spec = codec->spec;
	struct list_head *p;
	struct hda_gnode *node;
	int err;

	/*
	 * At first we look for an audio input widget.
	 * If it reaches to certain input PINs, we take it as the
	 * input path.
	 */
	list_for_each(p, &spec->nid_list) {
		node = list_entry(p, struct hda_gnode, list);
		if (node->wid_caps & AC_WCAP_DIGITAL)
			continue; /* skip SPDIF */
		if (node->type == AC_WID_AUD_IN) {
			err = parse_input_path(codec, node);
			if (err < 0)
				return err;
			else if (err > 0)
				return 0;
		}
	}
	snd_printd("hda_generic: no proper input path found\n");
	return 0;
}

/*
 * create mixer controls if possible
 */
#define DIR_OUT		0x1
#define DIR_IN		0x2

static int create_mixer(struct hda_codec *codec, struct hda_gnode *node,
			unsigned int index, const char *type, const char *dir_sfx)
{
	char name[32];
	int err;
	int created = 0;
	snd_kcontrol_new_t knew;

	if (type)
		sprintf(name, "%s %s Switch", type, dir_sfx);
	else
		sprintf(name, "%s Switch", dir_sfx);
	if ((node->wid_caps & AC_WCAP_IN_AMP) &&
	    (node->amp_in_caps & AC_AMPCAP_MUTE)) {
		knew = (snd_kcontrol_new_t)HDA_CODEC_MUTE(name, node->nid, index, HDA_INPUT);
		snd_printdd("[%s] NID=0x%x, DIR=IN, IDX=0x%x\n", name, node->nid, index);
		if ((err = snd_ctl_add(codec->bus->card, snd_ctl_new1(&knew, codec))) < 0)
			return err;
		created = 1;
	} else if ((node->wid_caps & AC_WCAP_OUT_AMP) &&
		   (node->amp_out_caps & AC_AMPCAP_MUTE)) {
		knew = (snd_kcontrol_new_t)HDA_CODEC_MUTE(name, node->nid, 0, HDA_OUTPUT);
		snd_printdd("[%s] NID=0x%x, DIR=OUT\n", name, node->nid);
		if ((err = snd_ctl_add(codec->bus->card, snd_ctl_new1(&knew, codec))) < 0)
			return err;
		created = 1;
	}

	if (type)
		sprintf(name, "%s %s Volume", type, dir_sfx);
	else
		sprintf(name, "%s Volume", dir_sfx);
	if ((node->wid_caps & AC_WCAP_IN_AMP) &&
	    (node->amp_in_caps & AC_AMPCAP_NUM_STEPS)) {
		knew = (snd_kcontrol_new_t)HDA_CODEC_VOLUME(name, node->nid, index, HDA_INPUT);
		snd_printdd("[%s] NID=0x%x, DIR=IN, IDX=0x%x\n", name, node->nid, index);
		if ((err = snd_ctl_add(codec->bus->card, snd_ctl_new1(&knew, codec))) < 0)
			return err;
		created = 1;
	} else if ((node->wid_caps & AC_WCAP_OUT_AMP) &&
		   (node->amp_out_caps & AC_AMPCAP_NUM_STEPS)) {
		knew = (snd_kcontrol_new_t)HDA_CODEC_VOLUME(name, node->nid, 0, HDA_OUTPUT);
		snd_printdd("[%s] NID=0x%x, DIR=OUT\n", name, node->nid);
		if ((err = snd_ctl_add(codec->bus->card, snd_ctl_new1(&knew, codec))) < 0)
			return err;
		created = 1;
	}

	return created;
}

/*
 * check whether the controls with the given name and direction suffix already exist
 */
static int check_existing_control(struct hda_codec *codec, const char *type, const char *dir)
{
	snd_ctl_elem_id_t id;
	memset(&id, 0, sizeof(id));
	sprintf(id.name, "%s %s Volume", type, dir);
	id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
	if (snd_ctl_find_id(codec->bus->card, &id))
		return 1;
	sprintf(id.name, "%s %s Switch", type, dir);
	id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
	if (snd_ctl_find_id(codec->bus->card, &id))
		return 1;
	return 0;
}

/*
 * build output mixer controls
 */
static int build_output_controls(struct hda_codec *codec)
{
	struct hda_gspec *spec = codec->spec;
	int err;

	err = create_mixer(codec, spec->pcm_vol_node, spec->pcm_vol_index,
			   "PCM", "Playback");
	if (err < 0)
		return err;
	return 0;
}

/* create capture volume/switch */
static int build_input_controls(struct hda_codec *codec)
{
	struct hda_gspec *spec = codec->spec;
	struct hda_gnode *adc_node = spec->adc_node;
	int err;

	if (! adc_node)
		return 0; /* not found */

	/* create capture volume and switch controls if the ADC has an amp */
	err = create_mixer(codec, adc_node, 0, NULL, "Capture");

	/* create input MUX if multiple sources are available */
	if (spec->input_mux.num_items > 1) {
		static snd_kcontrol_new_t cap_sel = {
			.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
			.name = "Capture Source",
			.info = capture_source_info,
			.get = capture_source_get,
			.put = capture_source_put,
		};
		if ((err = snd_ctl_add(codec->bus->card, snd_ctl_new1(&cap_sel, codec))) < 0)
			return err;
		spec->cur_cap_src = 0;
		select_input_connection(codec, adc_node, spec->input_mux.items[0].index);
	}
	return 0;
}


/*
 * parse the nodes recursively until reach to the output PIN.
 *
 * returns 0 - if not found,
 *         1 - if found, but no mixer is created
 *         2 - if found and mixer was already created, (just skip)
 *         a negative error code
 */
static int parse_loopback_path(struct hda_codec *codec, struct hda_gspec *spec,
			       struct hda_gnode *node, struct hda_gnode *dest_node,
			       const char *type)
{
	int i, err;

	if (node->checked)
		return 0;

	node->checked = 1;
	if (node == dest_node) {
		/* loopback connection found */
		return 1;
	}

	for (i = 0; i < node->nconns; i++) {
		struct hda_gnode *child = hda_get_node(spec, node->conn_list[i]);
		if (! child)
			continue;
		err = parse_loopback_path(codec, spec, child, dest_node, type);
		if (err < 0)
			return err;
		else if (err >= 1) {
			if (err == 1) {
				err = create_mixer(codec, node, i, type, "Playback");
				if (err < 0)
					return err;
				if (err > 0)
					return 2; /* ok, created */
				/* not created, maybe in the lower path */
				err = 1;
			}
			/* connect and unmute */
			if (node->nconns > 1)
				select_input_connection(codec, node, i);
			unmute_input(codec, node, i);
			unmute_output(codec, node);
			return err;
		}
	}
	return 0;
}

/*
 * parse the tree and build the loopback controls
 */
static int build_loopback_controls(struct hda_codec *codec)
{
	struct hda_gspec *spec = codec->spec;
	struct list_head *p;
	struct hda_gnode *node;
	int err;
	const char *type;

	if (! spec->out_pin_node)
		return 0;

	list_for_each(p, &spec->nid_list) {
		node = list_entry(p, struct hda_gnode, list);
		if (node->type != AC_WID_PIN)
			continue;
		/* input capable? */
		if (! (node->pin_caps & AC_PINCAP_IN))
			return 0;
		type = get_input_type(node, NULL);
		if (type) {
			if (check_existing_control(codec, type, "Playback"))
				continue;
			clear_check_flags(spec);
			err = parse_loopback_path(codec, spec, spec->out_pin_node,
						  node, type);
			if (err < 0)
				return err;
			if (! err)
				continue;
		}
	}
	return 0;
}

/*
 * build mixer controls
 */
static int build_generic_controls(struct hda_codec *codec)
{
	int err;

	if ((err = build_input_controls(codec)) < 0 ||
	    (err = build_output_controls(codec)) < 0 ||
	    (err = build_loopback_controls(codec)) < 0)
		return err;

	return 0;
}

/*
 * PCM
 */
static struct hda_pcm_stream generic_pcm_playback = {
	.substreams = 1,
	.channels_min = 2,
	.channels_max = 2,
};

static int build_generic_pcms(struct hda_codec *codec)
{
	struct hda_gspec *spec = codec->spec;
	struct hda_pcm *info = &spec->pcm_rec;

	if (! spec->dac_node && ! spec->adc_node) {
		snd_printd("hda_generic: no PCM found\n");
		return 0;
	}

	codec->num_pcms = 1;
	codec->pcm_info = info;

	info->name = "HDA Generic";
	if (spec->dac_node) {
		info->stream[0] = generic_pcm_playback;
		info->stream[0].nid = spec->dac_node->nid;
	}
	if (spec->adc_node) {
		info->stream[1] = generic_pcm_playback;
		info->stream[1].nid = spec->adc_node->nid;
	}

	return 0;
}


/*
 */
static struct hda_codec_ops generic_patch_ops = {
	.build_controls = build_generic_controls,
	.build_pcms = build_generic_pcms,
	.free = snd_hda_generic_free,
};

/*
 * the generic parser
 */
int snd_hda_parse_generic_codec(struct hda_codec *codec)
{
	struct hda_gspec *spec;
	int err;

	if(!codec->afg) {
		snd_printdd("hda_generic: no generic modem yet\n");
		return -ENODEV;
	}

	spec = kcalloc(1, sizeof(*spec), GFP_KERNEL);
	if (spec == NULL) {
		printk(KERN_ERR "hda_generic: can't allocate spec\n");
		return -ENOMEM;
	}
	codec->spec = spec;
	INIT_LIST_HEAD(&spec->nid_list);

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

	if ((err = parse_input(codec)) < 0 ||
	    (err = parse_output(codec)) < 0)
		goto error;

	codec->patch_ops = generic_patch_ops;

	return 0;

 error:
	snd_hda_generic_free(codec);
	return err;
}