summaryrefslogtreecommitdiffstats
path: root/sound/pci/hda/hda_hwdep.c
blob: 72e5885007ccfa39887389f644bd06fa1c77bcd2 (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
/*
 * HWDEP Interface for HD-audio codec
 *
 * Copyright (c) 2007 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 <linux/init.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/compat.h>
#include <linux/mutex.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/firmware.h>
#include <sound/core.h>
#include "hda_codec.h"
#include "hda_local.h"
#include <sound/hda_hwdep.h>
#include <sound/minors.h>

/* hint string pair */
struct hda_hint {
	const char *key;
	const char *val;	/* contained in the same alloc as key */
};

/*
 * write/read an out-of-bound verb
 */
static int verb_write_ioctl(struct hda_codec *codec,
			    struct hda_verb_ioctl __user *arg)
{
	u32 verb, res;

	if (get_user(verb, &arg->verb))
		return -EFAULT;
	res = snd_hda_codec_read(codec, verb >> 24, 0,
				 (verb >> 8) & 0xffff, verb & 0xff);
	if (put_user(res, &arg->res))
		return -EFAULT;
	return 0;
}

static int get_wcap_ioctl(struct hda_codec *codec,
			  struct hda_verb_ioctl __user *arg)
{
	u32 verb, res;
	
	if (get_user(verb, &arg->verb))
		return -EFAULT;
	res = get_wcaps(codec, verb >> 24);
	if (put_user(res, &arg->res))
		return -EFAULT;
	return 0;
}


/*
 */
static int hda_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
			   unsigned int cmd, unsigned long arg)
{
	struct hda_codec *codec = hw->private_data;
	void __user *argp = (void __user *)arg;

	switch (cmd) {
	case HDA_IOCTL_PVERSION:
		return put_user(HDA_HWDEP_VERSION, (int __user *)argp);
	case HDA_IOCTL_VERB_WRITE:
		return verb_write_ioctl(codec, argp);
	case HDA_IOCTL_GET_WCAP:
		return get_wcap_ioctl(codec, argp);
	}
	return -ENOIOCTLCMD;
}

#ifdef CONFIG_COMPAT
static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file,
				  unsigned int cmd, unsigned long arg)
{
	return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg));
}
#endif

static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
{
#ifndef CONFIG_SND_DEBUG_VERBOSE
	if (!capable(CAP_SYS_RAWIO))
		return -EACCES;
#endif
	return 0;
}

static void clear_hwdep_elements(struct hda_codec *codec)
{
	int i;

	/* clear init verbs */
	snd_array_free(&codec->init_verbs);
	/* clear hints */
	for (i = 0; i < codec->hints.used; i++) {
		struct hda_hint *hint = snd_array_elem(&codec->hints, i);
		kfree(hint->key); /* we don't need to free hint->val */
	}
	snd_array_free(&codec->hints);
	snd_array_free(&codec->user_pins);
}

static void hwdep_free(struct snd_hwdep *hwdep)
{
	clear_hwdep_elements(hwdep->private_data);
}

int /*__devinit*/ snd_hda_create_hwdep(struct hda_codec *codec)
{
	char hwname[16];
	struct snd_hwdep *hwdep;
	int err;

	sprintf(hwname, "HDA Codec %d", codec->addr);
	err = snd_hwdep_new(codec->bus->card, hwname, codec->addr, &hwdep);
	if (err < 0)
		return err;
	codec->hwdep = hwdep;
	sprintf(hwdep->name, "HDA Codec %d", codec->addr);
	hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
	hwdep->private_data = codec;
	hwdep->private_free = hwdep_free;
	hwdep->exclusive = 1;

	hwdep->ops.open = hda_hwdep_open;
	hwdep->ops.ioctl = hda_hwdep_ioctl;
#ifdef CONFIG_COMPAT
	hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
#endif

	snd_array_init(&codec->init_verbs, sizeof(struct hda_verb), 32);
	snd_array_init(&codec->hints, sizeof(struct hda_hint), 32);
	snd_array_init(&codec->user_pins, sizeof(struct hda_pincfg), 16);

	return 0;
}

#ifdef CONFIG_SND_HDA_POWER_SAVE
static ssize_t power_on_acct_show(struct device *dev,
				  struct device_attribute *attr,
				  char *buf)
{
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	struct hda_codec *codec = hwdep->private_data;
	snd_hda_update_power_acct(codec);
	return sprintf(buf, "%u\n", jiffies_to_msecs(codec->power_on_acct));
}

static ssize_t power_off_acct_show(struct device *dev,
				   struct device_attribute *attr,
				   char *buf)
{
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	struct hda_codec *codec = hwdep->private_data;
	snd_hda_update_power_acct(codec);
	return sprintf(buf, "%u\n", jiffies_to_msecs(codec->power_off_acct));
}

static struct device_attribute power_attrs[] = {
	__ATTR_RO(power_on_acct),
	__ATTR_RO(power_off_acct),
};

int snd_hda_hwdep_add_power_sysfs(struct hda_codec *codec)
{
	struct snd_hwdep *hwdep = codec->hwdep;
	int i;

	for (i = 0; i < ARRAY_SIZE(power_attrs); i++)
		snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
					  hwdep->device, &power_attrs[i]);
	return 0;
}
#endif /* CONFIG_SND_HDA_POWER_SAVE */

#ifdef CONFIG_SND_HDA_RECONFIG

/*
 * sysfs interface
 */

static int clear_codec(struct hda_codec *codec)
{
	int err;

	err = snd_hda_codec_reset(codec);
	if (err < 0) {
		snd_printk(KERN_ERR "The codec is being used, can't free.\n");
		return err;
	}
	clear_hwdep_elements(codec);
	return 0;
}

static int reconfig_codec(struct hda_codec *codec)
{
	int err;

	snd_hda_power_up(codec);
	snd_printk(KERN_INFO "hda-codec: reconfiguring\n");
	err = snd_hda_codec_reset(codec);
	if (err < 0) {
		snd_printk(KERN_ERR
			   "The codec is being used, can't reconfigure.\n");
		goto error;
	}
	err = snd_hda_codec_configure(codec);
	if (err < 0)
		goto error;
	/* rebuild PCMs */
	err = snd_hda_codec_build_pcms(codec);
	if (err < 0)
		goto error;
	/* rebuild mixers */
	err = snd_hda_codec_build_controls(codec);
	if (err < 0)
		goto error;
	err = snd_card_register(codec->bus->card);
 error:
	snd_hda_power_down(codec);
	return err;
}

/*
 * allocate a string at most len chars, and remove the trailing EOL
 */
static char *kstrndup_noeol(const char *src, size_t len)
{
	char *s = kstrndup(src, len, GFP_KERNEL);
	char *p;
	if (!s)
		return NULL;
	p = strchr(s, '\n');
	if (p)
		*p = 0;
	return s;
}

#define CODEC_INFO_SHOW(type)					\
static ssize_t type##_show(struct device *dev,			\
			   struct device_attribute *attr,	\
			   char *buf)				\
{								\
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);		\
	struct hda_codec *codec = hwdep->private_data;		\
	return sprintf(buf, "0x%x\n", codec->type);		\
}

#define CODEC_INFO_STR_SHOW(type)				\
static ssize_t type##_show(struct device *dev,			\
			     struct device_attribute *attr,	\
					char *buf)		\
{								\
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);		\
	struct hda_codec *codec = hwdep->private_data;		\
	return sprintf(buf, "%s\n",				\
		       codec->type ? codec->type : "");		\
}

CODEC_INFO_SHOW(vendor_id);
CODEC_INFO_SHOW(subsystem_id);
CODEC_INFO_SHOW(revision_id);
CODEC_INFO_SHOW(afg);
CODEC_INFO_SHOW(mfg);
CODEC_INFO_STR_SHOW(vendor_name);
CODEC_INFO_STR_SHOW(chip_name);
CODEC_INFO_STR_SHOW(modelname);

#define CODEC_INFO_STORE(type)					\
static ssize_t type##_store(struct device *dev,			\
			    struct device_attribute *attr,	\
			    const char *buf, size_t count)	\
{								\
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);		\
	struct hda_codec *codec = hwdep->private_data;		\
	unsigned long val;					\
	int err = strict_strtoul(buf, 0, &val);			\
	if (err < 0)						\
		return err;					\
	codec->type = val;					\
	return count;						\
}

#define CODEC_INFO_STR_STORE(type)				\
static ssize_t type##_store(struct device *dev,			\
			    struct device_attribute *attr,	\
			    const char *buf, size_t count)	\
{								\
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);		\
	struct hda_codec *codec = hwdep->private_data;		\
	char *s = kstrndup_noeol(buf, 64);			\
	if (!s)							\
		return -ENOMEM;					\
	kfree(codec->type);					\
	codec->type = s;					\
	return count;						\
}

CODEC_INFO_STORE(vendor_id);
CODEC_INFO_STORE(subsystem_id);
CODEC_INFO_STORE(revision_id);
CODEC_INFO_STR_STORE(vendor_name);
CODEC_INFO_STR_STORE(chip_name);
CODEC_INFO_STR_STORE(modelname);

#define CODEC_ACTION_STORE(type)				\
static ssize_t type##_store(struct device *dev,			\
			    struct device_attribute *attr,	\
			    const char *buf, size_t count)	\
{								\
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);		\
	struct hda_codec *codec = hwdep->private_data;		\
	int err = 0;						\
	if (*buf)						\
		err = type##_codec(codec);			\
	return err < 0 ? err : count;				\
}

CODEC_ACTION_STORE(reconfig);
CODEC_ACTION_STORE(clear);

static ssize_t init_verbs_show(struct device *dev,
			       struct device_attribute *attr,
			       char *buf)
{
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	struct hda_codec *codec = hwdep->private_data;
	int i, len = 0;
	for (i = 0; i < codec->init_verbs.used; i++) {
		struct hda_verb *v = snd_array_elem(&codec->init_verbs, i);
		len += snprintf(buf + len, PAGE_SIZE - len,
				"0x%02x 0x%03x 0x%04x\n",
				v->nid, v->verb, v->param);
	}
	return len;
}

static int parse_init_verbs(struct hda_codec *codec, const char *buf)
{
	struct hda_verb *v;
	int nid, verb, param;

	if (sscanf(buf, "%i %i %i", &nid, &verb, &param) != 3)
		return -EINVAL;
	if (!nid || !verb)
		return -EINVAL;
	v = snd_array_new(&codec->init_verbs);
	if (!v)
		return -ENOMEM;
	v->nid = nid;
	v->verb = verb;
	v->param = param;
	return 0;
}

static ssize_t init_verbs_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	struct hda_codec *codec = hwdep->private_data;
	int err = parse_init_verbs(codec, buf);
	if (err < 0)
		return err;
	return count;
}

static ssize_t hints_show(struct device *dev,
			  struct device_attribute *attr,
			  char *buf)
{
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	struct hda_codec *codec = hwdep->private_data;
	int i, len = 0;
	for (i = 0; i < codec->hints.used; i++) {
		struct hda_hint *hint = snd_array_elem(&codec->hints, i);
		len += snprintf(buf + len, PAGE_SIZE - len,
				"%s = %s\n", hint->key, hint->val);
	}
	return len;
}

static struct hda_hint *get_hint(struct hda_codec *codec, const char *key)
{
	int i;

	for (i = 0; i < codec->hints.used; i++) {
		struct hda_hint *hint = snd_array_elem(&codec->hints, i);
		if (!strcmp(hint->key, key))
			return hint;
	}
	return NULL;
}

static void remove_trail_spaces(char *str)
{
	char *p;
	if (!*str)
		return;
	p = str + strlen(str) - 1;
	for (; isspace(*p); p--) {
		*p = 0;
		if (p == str)
			return;
	}
}

#define MAX_HINTS	1024

static int parse_hints(struct hda_codec *codec, const char *buf)
{
	char *key, *val;
	struct hda_hint *hint;

	buf = skip_spaces(buf);
	if (!*buf || *buf == '#' || *buf == '\n')
		return 0;
	if (*buf == '=')
		return -EINVAL;
	key = kstrndup_noeol(buf, 1024);
	if (!key)
		return -ENOMEM;
	/* extract key and val */
	val = strchr(key, '=');
	if (!val) {
		kfree(key);
		return -EINVAL;
	}
	*val++ = 0;
	val = skip_spaces(val);
	remove_trail_spaces(key);
	remove_trail_spaces(val);
	hint = get_hint(codec, key);
	if (hint) {
		/* replace */
		kfree(hint->key);
		hint->key = key;
		hint->val = val;
		return 0;
	}
	/* allocate a new hint entry */
	if (codec->hints.used >= MAX_HINTS)
		hint = NULL;
	else
		hint = snd_array_new(&codec->hints);
	if (!hint) {
		kfree(key);
		return -ENOMEM;
	}
	hint->key = key;
	hint->val = val;
	return 0;
}

static ssize_t hints_store(struct device *dev,
			   struct device_attribute *attr,
			   const char *buf, size_t count)
{
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	struct hda_codec *codec = hwdep->private_data;
	int err = parse_hints(codec, buf);
	if (err < 0)
		return err;
	return count;
}

static ssize_t pin_configs_show(struct hda_codec *codec,
				struct snd_array *list,
				char *buf)
{
	int i, len = 0;
	for (i = 0; i < list->used; i++) {
		struct hda_pincfg *pin = snd_array_elem(list, i);
		len += sprintf(buf + len, "0x%02x 0x%08x\n",
			       pin->nid, pin->cfg);
	}
	return len;
}

static ssize_t init_pin_configs_show(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	struct hda_codec *codec = hwdep->private_data;
	return pin_configs_show(codec, &codec->init_pins, buf);
}

static ssize_t user_pin_configs_show(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	struct hda_codec *codec = hwdep->private_data;
	return pin_configs_show(codec, &codec->user_pins, buf);
}

static ssize_t driver_pin_configs_show(struct device *dev,
				       struct device_attribute *attr,
				       char *buf)
{
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	struct hda_codec *codec = hwdep->private_data;
	return pin_configs_show(codec, &codec->driver_pins, buf);
}

#define MAX_PIN_CONFIGS		32

static int parse_user_pin_configs(struct hda_codec *codec, const char *buf)
{
	int nid, cfg;

	if (sscanf(buf, "%i %i", &nid, &cfg) != 2)
		return -EINVAL;
	if (!nid)
		return -EINVAL;
	return snd_hda_add_pincfg(codec, &codec->user_pins, nid, cfg);
}

static ssize_t user_pin_configs_store(struct device *dev,
				      struct device_attribute *attr,
				      const char *buf, size_t count)
{
	struct snd_hwdep *hwdep = dev_get_drvdata(dev);
	struct hda_codec *codec = hwdep->private_data;
	int err = parse_user_pin_configs(codec, buf);
	if (err < 0)
		return err;
	return count;
}

#define CODEC_ATTR_RW(type) \
	__ATTR(type, 0644, type##_show, type##_store)
#define CODEC_ATTR_RO(type) \
	__ATTR_RO(type)
#define CODEC_ATTR_WO(type) \
	__ATTR(type, 0200, NULL, type##_store)

static struct device_attribute codec_attrs[] = {
	CODEC_ATTR_RW(vendor_id),
	CODEC_ATTR_RW(subsystem_id),
	CODEC_ATTR_RW(revision_id),
	CODEC_ATTR_RO(afg),
	CODEC_ATTR_RO(mfg),
	CODEC_ATTR_RW(vendor_name),
	CODEC_ATTR_RW(chip_name),
	CODEC_ATTR_RW(modelname),
	CODEC_ATTR_RW(init_verbs),
	CODEC_ATTR_RW(hints),
	CODEC_ATTR_RO(init_pin_configs),
	CODEC_ATTR_RW(user_pin_configs),
	CODEC_ATTR_RO(driver_pin_configs),
	CODEC_ATTR_WO(reconfig),
	CODEC_ATTR_WO(clear),
};

/*
 * create sysfs files on hwdep directory
 */
int snd_hda_hwdep_add_sysfs(struct hda_codec *codec)
{
	struct snd_hwdep *hwdep = codec->hwdep;
	int i;

	for (i = 0; i < ARRAY_SIZE(codec_attrs); i++)
		snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
					  hwdep->device, &codec_attrs[i]);
	return 0;
}

/*
 * Look for hint string
 */
const char *snd_hda_get_hint(struct hda_codec *codec, const char *key)
{
	struct hda_hint *hint = get_hint(codec, key);
	return hint ? hint->val : NULL;
}
EXPORT_SYMBOL_HDA(snd_hda_get_hint);

int snd_hda_get_bool_hint(struct hda_codec *codec, const char *key)
{
	const char *p = snd_hda_get_hint(codec, key);
	if (!p || !*p)
		return -ENOENT;
	switch (toupper(*p)) {
	case 'T': /* true */
	case 'Y': /* yes */
	case '1':
		return 1;
	}
	return 0;
}
EXPORT_SYMBOL_HDA(snd_hda_get_bool_hint);

#endif /* CONFIG_SND_HDA_RECONFIG */

#ifdef CONFIG_SND_HDA_PATCH_LOADER

/* parser mode */
enum {
	LINE_MODE_NONE,
	LINE_MODE_CODEC,
	LINE_MODE_MODEL,
	LINE_MODE_PINCFG,
	LINE_MODE_VERB,
	LINE_MODE_HINT,
	LINE_MODE_VENDOR_ID,
	LINE_MODE_SUBSYSTEM_ID,
	LINE_MODE_REVISION_ID,
	LINE_MODE_CHIP_NAME,
	NUM_LINE_MODES,
};

static inline int strmatch(const char *a, const char *b)
{
	return strnicmp(a, b, strlen(b)) == 0;
}

/* parse the contents after the line "[codec]"
 * accept only the line with three numbers, and assign the current codec
 */
static void parse_codec_mode(char *buf, struct hda_bus *bus,
			     struct hda_codec **codecp)
{
	int vendorid, subid, caddr;
	struct hda_codec *codec;

	*codecp = NULL;
	if (sscanf(buf, "%i %i %i", &vendorid, &subid, &caddr) == 3) {
		list_for_each_entry(codec, &bus->codec_list, list) {
			if ((vendorid <= 0 || codec->vendor_id == vendorid) &&
			    (subid <= 0 || codec->subsystem_id == subid) &&
			    codec->addr == caddr) {
				*codecp = codec;
				break;
			}
		}
	}
}

/* parse the contents after the other command tags, [pincfg], [verb],
 * [vendor_id], [subsystem_id], [revision_id], [chip_name], [hint] and [model]
 * just pass to the sysfs helper (only when any codec was specified)
 */
static void parse_pincfg_mode(char *buf, struct hda_bus *bus,
			      struct hda_codec **codecp)
{
	parse_user_pin_configs(*codecp, buf);
}

static void parse_verb_mode(char *buf, struct hda_bus *bus,
			    struct hda_codec **codecp)
{
	parse_init_verbs(*codecp, buf);
}

static void parse_hint_mode(char *buf, struct hda_bus *bus,
			    struct hda_codec **codecp)
{
	parse_hints(*codecp, buf);
}

static void parse_model_mode(char *buf, struct hda_bus *bus,
			     struct hda_codec **codecp)
{
	kfree((*codecp)->modelname);
	(*codecp)->modelname = kstrdup(buf, GFP_KERNEL);
}

static void parse_chip_name_mode(char *buf, struct hda_bus *bus,
				 struct hda_codec **codecp)
{
	kfree((*codecp)->chip_name);
	(*codecp)->chip_name = kstrdup(buf, GFP_KERNEL);
}

#define DEFINE_PARSE_ID_MODE(name) \
static void parse_##name##_mode(char *buf, struct hda_bus *bus, \
				 struct hda_codec **codecp) \
{ \
	unsigned long val; \
	if (!strict_strtoul(buf, 0, &val)) \
		(*codecp)->name = val; \
}

DEFINE_PARSE_ID_MODE(vendor_id);
DEFINE_PARSE_ID_MODE(subsystem_id);
DEFINE_PARSE_ID_MODE(revision_id);


struct hda_patch_item {
	const char *tag;
	void (*parser)(char *buf, struct hda_bus *bus, struct hda_codec **retc);
	int need_codec;
};

static struct hda_patch_item patch_items[NUM_LINE_MODES] = {
	[LINE_MODE_CODEC] = { "[codec]", parse_codec_mode, 0 },
	[LINE_MODE_MODEL] = { "[model]", parse_model_mode, 1 },
	[LINE_MODE_VERB] = { "[verb]", parse_verb_mode, 1 },
	[LINE_MODE_PINCFG] = { "[pincfg]", parse_pincfg_mode, 1 },
	[LINE_MODE_HINT] = { "[hint]", parse_hint_mode, 1 },
	[LINE_MODE_VENDOR_ID] = { "[vendor_id]", parse_vendor_id_mode, 1 },
	[LINE_MODE_SUBSYSTEM_ID] = { "[subsystem_id]", parse_subsystem_id_mode, 1 },
	[LINE_MODE_REVISION_ID] = { "[revision_id]", parse_revision_id_mode, 1 },
	[LINE_MODE_CHIP_NAME] = { "[chip_name]", parse_chip_name_mode, 1 },
};

/* check the line starting with '[' -- change the parser mode accodingly */
static int parse_line_mode(char *buf, struct hda_bus *bus)
{
	int i;
	for (i = 0; i < ARRAY_SIZE(patch_items); i++) {
		if (!patch_items[i].tag)
			continue;
		if (strmatch(buf, patch_items[i].tag))
			return i;
	}
	return LINE_MODE_NONE;
}

/* copy one line from the buffer in fw, and update the fields in fw
 * return zero if it reaches to the end of the buffer, or non-zero
 * if successfully copied a line
 *
 * the spaces at the beginning and the end of the line are stripped
 */
static int get_line_from_fw(char *buf, int size, struct firmware *fw)
{
	int len;
	const char *p = fw->data;
	while (isspace(*p) && fw->size) {
		p++;
		fw->size--;
	}
	if (!fw->size)
		return 0;
	if (size < fw->size)
		size = fw->size;

	for (len = 0; len < fw->size; len++) {
		if (!*p)
			break;
		if (*p == '\n') {
			p++;
			len++;
			break;
		}
		if (len < size)
			*buf++ = *p++;
	}
	*buf = 0;
	fw->size -= len;
	fw->data = p;
	remove_trail_spaces(buf);
	return 1;
}

/*
 * load a "patch" firmware file and parse it
 */
int snd_hda_load_patch(struct hda_bus *bus, const char *patch)
{
	int err;
	const struct firmware *fw;
	struct firmware tmp;
	char buf[128];
	struct hda_codec *codec;
	int line_mode;
	struct device *dev = bus->card->dev;

	if (snd_BUG_ON(!dev))
		return -ENODEV;
	err = request_firmware(&fw, patch, dev);
	if (err < 0) {
		printk(KERN_ERR "hda-codec: Cannot load the patch '%s'\n",
		       patch);
		return err;
	}

	tmp = *fw;
	line_mode = LINE_MODE_NONE;
	codec = NULL;
	while (get_line_from_fw(buf, sizeof(buf) - 1, &tmp)) {
		if (!*buf || *buf == '#' || *buf == '\n')
			continue;
		if (*buf == '[')
			line_mode = parse_line_mode(buf, bus);
		else if (patch_items[line_mode].parser &&
			 (codec || !patch_items[line_mode].need_codec))
			patch_items[line_mode].parser(buf, bus, &codec);
	}
	release_firmware(fw);
	return 0;
}
EXPORT_SYMBOL_HDA(snd_hda_load_patch);
#endif /* CONFIG_SND_HDA_PATCH_LOADER */