xref: /openbmc/linux/sound/pci/hda/hda_sysfs.c (revision 588b48ca) 
1 /*
2  * sysfs interface for HD-audio codec
3  *
4  * Copyright (c) 2014 Takashi Iwai <tiwai@suse.de>
5  *
6  * split from hda_hwdep.c
7  */
8 
9 #include <linux/init.h>
10 #include <linux/slab.h>
11 #include <linux/compat.h>
12 #include <linux/mutex.h>
13 #include <linux/ctype.h>
14 #include <linux/string.h>
15 #include <linux/export.h>
16 #include <sound/core.h>
17 #include "hda_codec.h"
18 #include "hda_local.h"
19 #include <sound/hda_hwdep.h>
20 #include <sound/minors.h>
21 
22 /* hint string pair */
23 struct hda_hint {
24 	const char *key;
25 	const char *val;	/* contained in the same alloc as key */
26 };
27 
28 #ifdef CONFIG_PM
29 static ssize_t power_on_acct_show(struct device *dev,
30 				  struct device_attribute *attr,
31 				  char *buf)
32 {
33 	struct hda_codec *codec = dev_get_drvdata(dev);
34 	snd_hda_update_power_acct(codec);
35 	return sprintf(buf, "%u\n", jiffies_to_msecs(codec->power_on_acct));
36 }
37 
38 static ssize_t power_off_acct_show(struct device *dev,
39 				   struct device_attribute *attr,
40 				   char *buf)
41 {
42 	struct hda_codec *codec = dev_get_drvdata(dev);
43 	snd_hda_update_power_acct(codec);
44 	return sprintf(buf, "%u\n", jiffies_to_msecs(codec->power_off_acct));
45 }
46 
47 static DEVICE_ATTR_RO(power_on_acct);
48 static DEVICE_ATTR_RO(power_off_acct);
49 #endif /* CONFIG_PM */
50 
51 #define CODEC_INFO_SHOW(type)					\
52 static ssize_t type##_show(struct device *dev,			\
53 			   struct device_attribute *attr,	\
54 			   char *buf)				\
55 {								\
56 	struct hda_codec *codec = dev_get_drvdata(dev);		\
57 	return sprintf(buf, "0x%x\n", codec->type);		\
58 }
59 
60 #define CODEC_INFO_STR_SHOW(type)				\
61 static ssize_t type##_show(struct device *dev,			\
62 			     struct device_attribute *attr,	\
63 					char *buf)		\
64 {								\
65 	struct hda_codec *codec = dev_get_drvdata(dev);		\
66 	return sprintf(buf, "%s\n",				\
67 		       codec->type ? codec->type : "");		\
68 }
69 
70 CODEC_INFO_SHOW(vendor_id);
71 CODEC_INFO_SHOW(subsystem_id);
72 CODEC_INFO_SHOW(revision_id);
73 CODEC_INFO_SHOW(afg);
74 CODEC_INFO_SHOW(mfg);
75 CODEC_INFO_STR_SHOW(vendor_name);
76 CODEC_INFO_STR_SHOW(chip_name);
77 CODEC_INFO_STR_SHOW(modelname);
78 
79 static ssize_t pin_configs_show(struct hda_codec *codec,
80 				struct snd_array *list,
81 				char *buf)
82 {
83 	int i, len = 0;
84 	mutex_lock(&codec->user_mutex);
85 	for (i = 0; i < list->used; i++) {
86 		struct hda_pincfg *pin = snd_array_elem(list, i);
87 		len += sprintf(buf + len, "0x%02x 0x%08x\n",
88 			       pin->nid, pin->cfg);
89 	}
90 	mutex_unlock(&codec->user_mutex);
91 	return len;
92 }
93 
94 static ssize_t init_pin_configs_show(struct device *dev,
95 				     struct device_attribute *attr,
96 				     char *buf)
97 {
98 	struct hda_codec *codec = dev_get_drvdata(dev);
99 	return pin_configs_show(codec, &codec->init_pins, buf);
100 }
101 
102 static ssize_t driver_pin_configs_show(struct device *dev,
103 				       struct device_attribute *attr,
104 				       char *buf)
105 {
106 	struct hda_codec *codec = dev_get_drvdata(dev);
107 	return pin_configs_show(codec, &codec->driver_pins, buf);
108 }
109 
110 #ifdef CONFIG_SND_HDA_RECONFIG
111 
112 /*
113  * sysfs interface
114  */
115 
116 static int clear_codec(struct hda_codec *codec)
117 {
118 	int err;
119 
120 	err = snd_hda_codec_reset(codec);
121 	if (err < 0) {
122 		codec_err(codec, "The codec is being used, can't free.\n");
123 		return err;
124 	}
125 	snd_hda_sysfs_clear(codec);
126 	return 0;
127 }
128 
129 static int reconfig_codec(struct hda_codec *codec)
130 {
131 	int err;
132 
133 	snd_hda_power_up(codec);
134 	codec_info(codec, "hda-codec: reconfiguring\n");
135 	err = snd_hda_codec_reset(codec);
136 	if (err < 0) {
137 		codec_err(codec,
138 			   "The codec is being used, can't reconfigure.\n");
139 		goto error;
140 	}
141 	err = snd_hda_codec_configure(codec);
142 	if (err < 0)
143 		goto error;
144 	/* rebuild PCMs */
145 	err = snd_hda_codec_build_pcms(codec);
146 	if (err < 0)
147 		goto error;
148 	/* rebuild mixers */
149 	err = snd_hda_codec_build_controls(codec);
150 	if (err < 0)
151 		goto error;
152 	err = snd_card_register(codec->bus->card);
153  error:
154 	snd_hda_power_down(codec);
155 	return err;
156 }
157 
158 /*
159  * allocate a string at most len chars, and remove the trailing EOL
160  */
161 static char *kstrndup_noeol(const char *src, size_t len)
162 {
163 	char *s = kstrndup(src, len, GFP_KERNEL);
164 	char *p;
165 	if (!s)
166 		return NULL;
167 	p = strchr(s, '\n');
168 	if (p)
169 		*p = 0;
170 	return s;
171 }
172 
173 #define CODEC_INFO_STORE(type)					\
174 static ssize_t type##_store(struct device *dev,			\
175 			    struct device_attribute *attr,	\
176 			    const char *buf, size_t count)	\
177 {								\
178 	struct hda_codec *codec = dev_get_drvdata(dev);		\
179 	unsigned long val;					\
180 	int err = kstrtoul(buf, 0, &val);			\
181 	if (err < 0)						\
182 		return err;					\
183 	codec->type = val;					\
184 	return count;						\
185 }
186 
187 #define CODEC_INFO_STR_STORE(type)				\
188 static ssize_t type##_store(struct device *dev,			\
189 			    struct device_attribute *attr,	\
190 			    const char *buf, size_t count)	\
191 {								\
192 	struct hda_codec *codec = dev_get_drvdata(dev);		\
193 	char *s = kstrndup_noeol(buf, 64);			\
194 	if (!s)							\
195 		return -ENOMEM;					\
196 	kfree(codec->type);					\
197 	codec->type = s;					\
198 	return count;						\
199 }
200 
201 CODEC_INFO_STORE(vendor_id);
202 CODEC_INFO_STORE(subsystem_id);
203 CODEC_INFO_STORE(revision_id);
204 CODEC_INFO_STR_STORE(vendor_name);
205 CODEC_INFO_STR_STORE(chip_name);
206 CODEC_INFO_STR_STORE(modelname);
207 
208 #define CODEC_ACTION_STORE(type)				\
209 static ssize_t type##_store(struct device *dev,			\
210 			    struct device_attribute *attr,	\
211 			    const char *buf, size_t count)	\
212 {								\
213 	struct hda_codec *codec = dev_get_drvdata(dev);		\
214 	int err = 0;						\
215 	if (*buf)						\
216 		err = type##_codec(codec);			\
217 	return err < 0 ? err : count;				\
218 }
219 
220 CODEC_ACTION_STORE(reconfig);
221 CODEC_ACTION_STORE(clear);
222 
223 static ssize_t init_verbs_show(struct device *dev,
224 			       struct device_attribute *attr,
225 			       char *buf)
226 {
227 	struct hda_codec *codec = dev_get_drvdata(dev);
228 	int i, len = 0;
229 	mutex_lock(&codec->user_mutex);
230 	for (i = 0; i < codec->init_verbs.used; i++) {
231 		struct hda_verb *v = snd_array_elem(&codec->init_verbs, i);
232 		len += snprintf(buf + len, PAGE_SIZE - len,
233 				"0x%02x 0x%03x 0x%04x\n",
234 				v->nid, v->verb, v->param);
235 	}
236 	mutex_unlock(&codec->user_mutex);
237 	return len;
238 }
239 
240 static int parse_init_verbs(struct hda_codec *codec, const char *buf)
241 {
242 	struct hda_verb *v;
243 	int nid, verb, param;
244 
245 	if (sscanf(buf, "%i %i %i", &nid, &verb, &param) != 3)
246 		return -EINVAL;
247 	if (!nid || !verb)
248 		return -EINVAL;
249 	mutex_lock(&codec->user_mutex);
250 	v = snd_array_new(&codec->init_verbs);
251 	if (!v) {
252 		mutex_unlock(&codec->user_mutex);
253 		return -ENOMEM;
254 	}
255 	v->nid = nid;
256 	v->verb = verb;
257 	v->param = param;
258 	mutex_unlock(&codec->user_mutex);
259 	return 0;
260 }
261 
262 static ssize_t init_verbs_store(struct device *dev,
263 				struct device_attribute *attr,
264 				const char *buf, size_t count)
265 {
266 	struct hda_codec *codec = dev_get_drvdata(dev);
267 	int err = parse_init_verbs(codec, buf);
268 	if (err < 0)
269 		return err;
270 	return count;
271 }
272 
273 static ssize_t hints_show(struct device *dev,
274 			  struct device_attribute *attr,
275 			  char *buf)
276 {
277 	struct hda_codec *codec = dev_get_drvdata(dev);
278 	int i, len = 0;
279 	mutex_lock(&codec->user_mutex);
280 	for (i = 0; i < codec->hints.used; i++) {
281 		struct hda_hint *hint = snd_array_elem(&codec->hints, i);
282 		len += snprintf(buf + len, PAGE_SIZE - len,
283 				"%s = %s\n", hint->key, hint->val);
284 	}
285 	mutex_unlock(&codec->user_mutex);
286 	return len;
287 }
288 
289 static struct hda_hint *get_hint(struct hda_codec *codec, const char *key)
290 {
291 	int i;
292 
293 	for (i = 0; i < codec->hints.used; i++) {
294 		struct hda_hint *hint = snd_array_elem(&codec->hints, i);
295 		if (!strcmp(hint->key, key))
296 			return hint;
297 	}
298 	return NULL;
299 }
300 
301 static void remove_trail_spaces(char *str)
302 {
303 	char *p;
304 	if (!*str)
305 		return;
306 	p = str + strlen(str) - 1;
307 	for (; isspace(*p); p--) {
308 		*p = 0;
309 		if (p == str)
310 			return;
311 	}
312 }
313 
314 #define MAX_HINTS	1024
315 
316 static int parse_hints(struct hda_codec *codec, const char *buf)
317 {
318 	char *key, *val;
319 	struct hda_hint *hint;
320 	int err = 0;
321 
322 	buf = skip_spaces(buf);
323 	if (!*buf || *buf == '#' || *buf == '\n')
324 		return 0;
325 	if (*buf == '=')
326 		return -EINVAL;
327 	key = kstrndup_noeol(buf, 1024);
328 	if (!key)
329 		return -ENOMEM;
330 	/* extract key and val */
331 	val = strchr(key, '=');
332 	if (!val) {
333 		kfree(key);
334 		return -EINVAL;
335 	}
336 	*val++ = 0;
337 	val = skip_spaces(val);
338 	remove_trail_spaces(key);
339 	remove_trail_spaces(val);
340 	mutex_lock(&codec->user_mutex);
341 	hint = get_hint(codec, key);
342 	if (hint) {
343 		/* replace */
344 		kfree(hint->key);
345 		hint->key = key;
346 		hint->val = val;
347 		goto unlock;
348 	}
349 	/* allocate a new hint entry */
350 	if (codec->hints.used >= MAX_HINTS)
351 		hint = NULL;
352 	else
353 		hint = snd_array_new(&codec->hints);
354 	if (hint) {
355 		hint->key = key;
356 		hint->val = val;
357 	} else {
358 		err = -ENOMEM;
359 	}
360  unlock:
361 	mutex_unlock(&codec->user_mutex);
362 	if (err)
363 		kfree(key);
364 	return err;
365 }
366 
367 static ssize_t hints_store(struct device *dev,
368 			   struct device_attribute *attr,
369 			   const char *buf, size_t count)
370 {
371 	struct hda_codec *codec = dev_get_drvdata(dev);
372 	int err = parse_hints(codec, buf);
373 	if (err < 0)
374 		return err;
375 	return count;
376 }
377 
378 static ssize_t user_pin_configs_show(struct device *dev,
379 				     struct device_attribute *attr,
380 				     char *buf)
381 {
382 	struct hda_codec *codec = dev_get_drvdata(dev);
383 	return pin_configs_show(codec, &codec->user_pins, buf);
384 }
385 
386 #define MAX_PIN_CONFIGS		32
387 
388 static int parse_user_pin_configs(struct hda_codec *codec, const char *buf)
389 {
390 	int nid, cfg, err;
391 
392 	if (sscanf(buf, "%i %i", &nid, &cfg) != 2)
393 		return -EINVAL;
394 	if (!nid)
395 		return -EINVAL;
396 	mutex_lock(&codec->user_mutex);
397 	err = snd_hda_add_pincfg(codec, &codec->user_pins, nid, cfg);
398 	mutex_unlock(&codec->user_mutex);
399 	return err;
400 }
401 
402 static ssize_t user_pin_configs_store(struct device *dev,
403 				      struct device_attribute *attr,
404 				      const char *buf, size_t count)
405 {
406 	struct hda_codec *codec = dev_get_drvdata(dev);
407 	int err = parse_user_pin_configs(codec, buf);
408 	if (err < 0)
409 		return err;
410 	return count;
411 }
412 
413 /* sysfs attributes exposed only when CONFIG_SND_HDA_RECONFIG=y */
414 static DEVICE_ATTR_RW(init_verbs);
415 static DEVICE_ATTR_RW(hints);
416 static DEVICE_ATTR_RW(user_pin_configs);
417 static DEVICE_ATTR_WO(reconfig);
418 static DEVICE_ATTR_WO(clear);
419 
420 /*
421  * Look for hint string
422  */
423 const char *snd_hda_get_hint(struct hda_codec *codec, const char *key)
424 {
425 	struct hda_hint *hint = get_hint(codec, key);
426 	return hint ? hint->val : NULL;
427 }
428 EXPORT_SYMBOL_GPL(snd_hda_get_hint);
429 
430 int snd_hda_get_bool_hint(struct hda_codec *codec, const char *key)
431 {
432 	const char *p;
433 	int ret;
434 
435 	mutex_lock(&codec->user_mutex);
436 	p = snd_hda_get_hint(codec, key);
437 	if (!p || !*p)
438 		ret = -ENOENT;
439 	else {
440 		switch (toupper(*p)) {
441 		case 'T': /* true */
442 		case 'Y': /* yes */
443 		case '1':
444 			ret = 1;
445 			break;
446 		default:
447 			ret = 0;
448 			break;
449 		}
450 	}
451 	mutex_unlock(&codec->user_mutex);
452 	return ret;
453 }
454 EXPORT_SYMBOL_GPL(snd_hda_get_bool_hint);
455 
456 int snd_hda_get_int_hint(struct hda_codec *codec, const char *key, int *valp)
457 {
458 	const char *p;
459 	unsigned long val;
460 	int ret;
461 
462 	mutex_lock(&codec->user_mutex);
463 	p = snd_hda_get_hint(codec, key);
464 	if (!p)
465 		ret = -ENOENT;
466 	else if (kstrtoul(p, 0, &val))
467 		ret = -EINVAL;
468 	else {
469 		*valp = val;
470 		ret = 0;
471 	}
472 	mutex_unlock(&codec->user_mutex);
473 	return ret;
474 }
475 EXPORT_SYMBOL_GPL(snd_hda_get_int_hint);
476 #endif /* CONFIG_SND_HDA_RECONFIG */
477 
478 /*
479  * common sysfs attributes
480  */
481 #ifdef CONFIG_SND_HDA_RECONFIG
482 #define RECONFIG_DEVICE_ATTR(name)	DEVICE_ATTR_RW(name)
483 #else
484 #define RECONFIG_DEVICE_ATTR(name)	DEVICE_ATTR_RO(name)
485 #endif
486 static RECONFIG_DEVICE_ATTR(vendor_id);
487 static RECONFIG_DEVICE_ATTR(subsystem_id);
488 static RECONFIG_DEVICE_ATTR(revision_id);
489 static DEVICE_ATTR_RO(afg);
490 static DEVICE_ATTR_RO(mfg);
491 static RECONFIG_DEVICE_ATTR(vendor_name);
492 static RECONFIG_DEVICE_ATTR(chip_name);
493 static RECONFIG_DEVICE_ATTR(modelname);
494 static DEVICE_ATTR_RO(init_pin_configs);
495 static DEVICE_ATTR_RO(driver_pin_configs);
496 
497 
498 #ifdef CONFIG_SND_HDA_PATCH_LOADER
499 
500 /* parser mode */
501 enum {
502 	LINE_MODE_NONE,
503 	LINE_MODE_CODEC,
504 	LINE_MODE_MODEL,
505 	LINE_MODE_PINCFG,
506 	LINE_MODE_VERB,
507 	LINE_MODE_HINT,
508 	LINE_MODE_VENDOR_ID,
509 	LINE_MODE_SUBSYSTEM_ID,
510 	LINE_MODE_REVISION_ID,
511 	LINE_MODE_CHIP_NAME,
512 	NUM_LINE_MODES,
513 };
514 
515 static inline int strmatch(const char *a, const char *b)
516 {
517 	return strnicmp(a, b, strlen(b)) == 0;
518 }
519 
520 /* parse the contents after the line "[codec]"
521  * accept only the line with three numbers, and assign the current codec
522  */
523 static void parse_codec_mode(char *buf, struct hda_bus *bus,
524 			     struct hda_codec **codecp)
525 {
526 	int vendorid, subid, caddr;
527 	struct hda_codec *codec;
528 
529 	*codecp = NULL;
530 	if (sscanf(buf, "%i %i %i", &vendorid, &subid, &caddr) == 3) {
531 		list_for_each_entry(codec, &bus->codec_list, list) {
532 			if ((vendorid <= 0 || codec->vendor_id == vendorid) &&
533 			    (subid <= 0 || codec->subsystem_id == subid) &&
534 			    codec->addr == caddr) {
535 				*codecp = codec;
536 				break;
537 			}
538 		}
539 	}
540 }
541 
542 /* parse the contents after the other command tags, [pincfg], [verb],
543  * [vendor_id], [subsystem_id], [revision_id], [chip_name], [hint] and [model]
544  * just pass to the sysfs helper (only when any codec was specified)
545  */
546 static void parse_pincfg_mode(char *buf, struct hda_bus *bus,
547 			      struct hda_codec **codecp)
548 {
549 	parse_user_pin_configs(*codecp, buf);
550 }
551 
552 static void parse_verb_mode(char *buf, struct hda_bus *bus,
553 			    struct hda_codec **codecp)
554 {
555 	parse_init_verbs(*codecp, buf);
556 }
557 
558 static void parse_hint_mode(char *buf, struct hda_bus *bus,
559 			    struct hda_codec **codecp)
560 {
561 	parse_hints(*codecp, buf);
562 }
563 
564 static void parse_model_mode(char *buf, struct hda_bus *bus,
565 			     struct hda_codec **codecp)
566 {
567 	kfree((*codecp)->modelname);
568 	(*codecp)->modelname = kstrdup(buf, GFP_KERNEL);
569 }
570 
571 static void parse_chip_name_mode(char *buf, struct hda_bus *bus,
572 				 struct hda_codec **codecp)
573 {
574 	kfree((*codecp)->chip_name);
575 	(*codecp)->chip_name = kstrdup(buf, GFP_KERNEL);
576 }
577 
578 #define DEFINE_PARSE_ID_MODE(name) \
579 static void parse_##name##_mode(char *buf, struct hda_bus *bus, \
580 				 struct hda_codec **codecp) \
581 { \
582 	unsigned long val; \
583 	if (!kstrtoul(buf, 0, &val)) \
584 		(*codecp)->name = val; \
585 }
586 
587 DEFINE_PARSE_ID_MODE(vendor_id);
588 DEFINE_PARSE_ID_MODE(subsystem_id);
589 DEFINE_PARSE_ID_MODE(revision_id);
590 
591 
592 struct hda_patch_item {
593 	const char *tag;
594 	const char *alias;
595 	void (*parser)(char *buf, struct hda_bus *bus, struct hda_codec **retc);
596 };
597 
598 static struct hda_patch_item patch_items[NUM_LINE_MODES] = {
599 	[LINE_MODE_CODEC] = {
600 		.tag = "[codec]",
601 		.parser = parse_codec_mode,
602 	},
603 	[LINE_MODE_MODEL] = {
604 		.tag = "[model]",
605 		.parser = parse_model_mode,
606 	},
607 	[LINE_MODE_VERB] = {
608 		.tag = "[verb]",
609 		.alias = "[init_verbs]",
610 		.parser = parse_verb_mode,
611 	},
612 	[LINE_MODE_PINCFG] = {
613 		.tag = "[pincfg]",
614 		.alias = "[user_pin_configs]",
615 		.parser = parse_pincfg_mode,
616 	},
617 	[LINE_MODE_HINT] = {
618 		.tag = "[hint]",
619 		.alias = "[hints]",
620 		.parser = parse_hint_mode
621 	},
622 	[LINE_MODE_VENDOR_ID] = {
623 		.tag = "[vendor_id]",
624 		.parser = parse_vendor_id_mode,
625 	},
626 	[LINE_MODE_SUBSYSTEM_ID] = {
627 		.tag = "[subsystem_id]",
628 		.parser = parse_subsystem_id_mode,
629 	},
630 	[LINE_MODE_REVISION_ID] = {
631 		.tag = "[revision_id]",
632 		.parser = parse_revision_id_mode,
633 	},
634 	[LINE_MODE_CHIP_NAME] = {
635 		.tag = "[chip_name]",
636 		.parser = parse_chip_name_mode,
637 	},
638 };
639 
640 /* check the line starting with '[' -- change the parser mode accodingly */
641 static int parse_line_mode(char *buf, struct hda_bus *bus)
642 {
643 	int i;
644 	for (i = 0; i < ARRAY_SIZE(patch_items); i++) {
645 		if (!patch_items[i].tag)
646 			continue;
647 		if (strmatch(buf, patch_items[i].tag))
648 			return i;
649 		if (patch_items[i].alias && strmatch(buf, patch_items[i].alias))
650 			return i;
651 	}
652 	return LINE_MODE_NONE;
653 }
654 
655 /* copy one line from the buffer in fw, and update the fields in fw
656  * return zero if it reaches to the end of the buffer, or non-zero
657  * if successfully copied a line
658  *
659  * the spaces at the beginning and the end of the line are stripped
660  */
661 static int get_line_from_fw(char *buf, int size, size_t *fw_size_p,
662 			    const void **fw_data_p)
663 {
664 	int len;
665 	size_t fw_size = *fw_size_p;
666 	const char *p = *fw_data_p;
667 
668 	while (isspace(*p) && fw_size) {
669 		p++;
670 		fw_size--;
671 	}
672 	if (!fw_size)
673 		return 0;
674 
675 	for (len = 0; len < fw_size; len++) {
676 		if (!*p)
677 			break;
678 		if (*p == '\n') {
679 			p++;
680 			len++;
681 			break;
682 		}
683 		if (len < size)
684 			*buf++ = *p++;
685 	}
686 	*buf = 0;
687 	*fw_size_p = fw_size - len;
688 	*fw_data_p = p;
689 	remove_trail_spaces(buf);
690 	return 1;
691 }
692 
693 /*
694  * load a "patch" firmware file and parse it
695  */
696 int snd_hda_load_patch(struct hda_bus *bus, size_t fw_size, const void *fw_buf)
697 {
698 	char buf[128];
699 	struct hda_codec *codec;
700 	int line_mode;
701 
702 	line_mode = LINE_MODE_NONE;
703 	codec = NULL;
704 	while (get_line_from_fw(buf, sizeof(buf) - 1, &fw_size, &fw_buf)) {
705 		if (!*buf || *buf == '#' || *buf == '\n')
706 			continue;
707 		if (*buf == '[')
708 			line_mode = parse_line_mode(buf, bus);
709 		else if (patch_items[line_mode].parser &&
710 			 (codec || line_mode <= LINE_MODE_CODEC))
711 			patch_items[line_mode].parser(buf, bus, &codec);
712 	}
713 	return 0;
714 }
715 EXPORT_SYMBOL_GPL(snd_hda_load_patch);
716 #endif /* CONFIG_SND_HDA_PATCH_LOADER */
717 
718 /*
719  * sysfs entries
720  */
721 static struct attribute *hda_dev_attrs[] = {
722 	&dev_attr_vendor_id.attr,
723 	&dev_attr_subsystem_id.attr,
724 	&dev_attr_revision_id.attr,
725 	&dev_attr_afg.attr,
726 	&dev_attr_mfg.attr,
727 	&dev_attr_vendor_name.attr,
728 	&dev_attr_chip_name.attr,
729 	&dev_attr_modelname.attr,
730 	&dev_attr_init_pin_configs.attr,
731 	&dev_attr_driver_pin_configs.attr,
732 #ifdef CONFIG_PM
733 	&dev_attr_power_on_acct.attr,
734 	&dev_attr_power_off_acct.attr,
735 #endif
736 #ifdef CONFIG_SND_HDA_RECONFIG
737 	&dev_attr_init_verbs.attr,
738 	&dev_attr_hints.attr,
739 	&dev_attr_user_pin_configs.attr,
740 	&dev_attr_reconfig.attr,
741 	&dev_attr_clear.attr,
742 #endif
743 	NULL
744 };
745 
746 static struct attribute_group hda_dev_attr_group = {
747 	.attrs	= hda_dev_attrs,
748 };
749 
750 const struct attribute_group *snd_hda_dev_attr_groups[] = {
751 	&hda_dev_attr_group,
752 	NULL
753 };
754 
755 void snd_hda_sysfs_init(struct hda_codec *codec)
756 {
757 	mutex_init(&codec->user_mutex);
758 #ifdef CONFIG_SND_HDA_RECONFIG
759 	snd_array_init(&codec->init_verbs, sizeof(struct hda_verb), 32);
760 	snd_array_init(&codec->hints, sizeof(struct hda_hint), 32);
761 	snd_array_init(&codec->user_pins, sizeof(struct hda_pincfg), 16);
762 #endif
763 }
764 
765 void snd_hda_sysfs_clear(struct hda_codec *codec)
766 {
767 #ifdef CONFIG_SND_HDA_RECONFIG
768 	int i;
769 
770 	/* clear init verbs */
771 	snd_array_free(&codec->init_verbs);
772 	/* clear hints */
773 	for (i = 0; i < codec->hints.used; i++) {
774 		struct hda_hint *hint = snd_array_elem(&codec->hints, i);
775 		kfree(hint->key); /* we don't need to free hint->val */
776 	}
777 	snd_array_free(&codec->hints);
778 	snd_array_free(&codec->user_pins);
779 #endif
780 }
781