xref: /linux/sound/soc/soc-dapm.c (revision b889fcf63cb62e7fdb7816565e28f44dbe4a76a5)
1 /*
2  * soc-dapm.c  --  ALSA SoC Dynamic Audio Power Management
3  *
4  * Copyright 2005 Wolfson Microelectronics PLC.
5  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
6  *
7  *  This program is free software; you can redistribute  it and/or modify it
8  *  under  the terms of  the GNU General  Public License as published by the
9  *  Free Software Foundation;  either version 2 of the  License, or (at your
10  *  option) any later version.
11  *
12  *  Features:
13  *    o Changes power status of internal codec blocks depending on the
14  *      dynamic configuration of codec internal audio paths and active
15  *      DACs/ADCs.
16  *    o Platform power domain - can support external components i.e. amps and
17  *      mic/headphone insertion events.
18  *    o Automatic Mic Bias support
19  *    o Jack insertion power event initiation - e.g. hp insertion will enable
20  *      sinks, dacs, etc
21  *    o Delayed power down of audio subsystem to reduce pops between a quick
22  *      device reopen.
23  *
24  */
25 
26 #include <linux/module.h>
27 #include <linux/moduleparam.h>
28 #include <linux/init.h>
29 #include <linux/async.h>
30 #include <linux/delay.h>
31 #include <linux/pm.h>
32 #include <linux/bitops.h>
33 #include <linux/platform_device.h>
34 #include <linux/jiffies.h>
35 #include <linux/debugfs.h>
36 #include <linux/pm_runtime.h>
37 #include <linux/regulator/consumer.h>
38 #include <linux/clk.h>
39 #include <linux/slab.h>
40 #include <sound/core.h>
41 #include <sound/pcm.h>
42 #include <sound/pcm_params.h>
43 #include <sound/soc.h>
44 #include <sound/initval.h>
45 
46 #include <trace/events/asoc.h>
47 
48 #define DAPM_UPDATE_STAT(widget, val) widget->dapm->card->dapm_stats.val++;
49 
50 /* dapm power sequences - make this per codec in the future */
51 static int dapm_up_seq[] = {
52 	[snd_soc_dapm_pre] = 0,
53 	[snd_soc_dapm_supply] = 1,
54 	[snd_soc_dapm_regulator_supply] = 1,
55 	[snd_soc_dapm_clock_supply] = 1,
56 	[snd_soc_dapm_micbias] = 2,
57 	[snd_soc_dapm_dai_link] = 2,
58 	[snd_soc_dapm_dai] = 3,
59 	[snd_soc_dapm_aif_in] = 3,
60 	[snd_soc_dapm_aif_out] = 3,
61 	[snd_soc_dapm_mic] = 4,
62 	[snd_soc_dapm_mux] = 5,
63 	[snd_soc_dapm_virt_mux] = 5,
64 	[snd_soc_dapm_value_mux] = 5,
65 	[snd_soc_dapm_dac] = 6,
66 	[snd_soc_dapm_mixer] = 7,
67 	[snd_soc_dapm_mixer_named_ctl] = 7,
68 	[snd_soc_dapm_pga] = 8,
69 	[snd_soc_dapm_adc] = 9,
70 	[snd_soc_dapm_out_drv] = 10,
71 	[snd_soc_dapm_hp] = 10,
72 	[snd_soc_dapm_spk] = 10,
73 	[snd_soc_dapm_line] = 10,
74 	[snd_soc_dapm_post] = 11,
75 };
76 
77 static int dapm_down_seq[] = {
78 	[snd_soc_dapm_pre] = 0,
79 	[snd_soc_dapm_adc] = 1,
80 	[snd_soc_dapm_hp] = 2,
81 	[snd_soc_dapm_spk] = 2,
82 	[snd_soc_dapm_line] = 2,
83 	[snd_soc_dapm_out_drv] = 2,
84 	[snd_soc_dapm_pga] = 4,
85 	[snd_soc_dapm_mixer_named_ctl] = 5,
86 	[snd_soc_dapm_mixer] = 5,
87 	[snd_soc_dapm_dac] = 6,
88 	[snd_soc_dapm_mic] = 7,
89 	[snd_soc_dapm_micbias] = 8,
90 	[snd_soc_dapm_mux] = 9,
91 	[snd_soc_dapm_virt_mux] = 9,
92 	[snd_soc_dapm_value_mux] = 9,
93 	[snd_soc_dapm_aif_in] = 10,
94 	[snd_soc_dapm_aif_out] = 10,
95 	[snd_soc_dapm_dai] = 10,
96 	[snd_soc_dapm_dai_link] = 11,
97 	[snd_soc_dapm_clock_supply] = 12,
98 	[snd_soc_dapm_regulator_supply] = 12,
99 	[snd_soc_dapm_supply] = 12,
100 	[snd_soc_dapm_post] = 13,
101 };
102 
103 static void pop_wait(u32 pop_time)
104 {
105 	if (pop_time)
106 		schedule_timeout_uninterruptible(msecs_to_jiffies(pop_time));
107 }
108 
109 static void pop_dbg(struct device *dev, u32 pop_time, const char *fmt, ...)
110 {
111 	va_list args;
112 	char *buf;
113 
114 	if (!pop_time)
115 		return;
116 
117 	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
118 	if (buf == NULL)
119 		return;
120 
121 	va_start(args, fmt);
122 	vsnprintf(buf, PAGE_SIZE, fmt, args);
123 	dev_info(dev, "%s", buf);
124 	va_end(args);
125 
126 	kfree(buf);
127 }
128 
129 static bool dapm_dirty_widget(struct snd_soc_dapm_widget *w)
130 {
131 	return !list_empty(&w->dirty);
132 }
133 
134 void dapm_mark_dirty(struct snd_soc_dapm_widget *w, const char *reason)
135 {
136 	if (!dapm_dirty_widget(w)) {
137 		dev_vdbg(w->dapm->dev, "Marking %s dirty due to %s\n",
138 			 w->name, reason);
139 		list_add_tail(&w->dirty, &w->dapm->card->dapm_dirty);
140 	}
141 }
142 EXPORT_SYMBOL_GPL(dapm_mark_dirty);
143 
144 void dapm_mark_io_dirty(struct snd_soc_dapm_context *dapm)
145 {
146 	struct snd_soc_card *card = dapm->card;
147 	struct snd_soc_dapm_widget *w;
148 
149 	mutex_lock(&card->dapm_mutex);
150 
151 	list_for_each_entry(w, &card->widgets, list) {
152 		switch (w->id) {
153 		case snd_soc_dapm_input:
154 		case snd_soc_dapm_output:
155 			dapm_mark_dirty(w, "Rechecking inputs and outputs");
156 			break;
157 		default:
158 			break;
159 		}
160 	}
161 
162 	mutex_unlock(&card->dapm_mutex);
163 }
164 EXPORT_SYMBOL_GPL(dapm_mark_io_dirty);
165 
166 /* create a new dapm widget */
167 static inline struct snd_soc_dapm_widget *dapm_cnew_widget(
168 	const struct snd_soc_dapm_widget *_widget)
169 {
170 	return kmemdup(_widget, sizeof(*_widget), GFP_KERNEL);
171 }
172 
173 /* get snd_card from DAPM context */
174 static inline struct snd_card *dapm_get_snd_card(
175 	struct snd_soc_dapm_context *dapm)
176 {
177 	if (dapm->codec)
178 		return dapm->codec->card->snd_card;
179 	else if (dapm->platform)
180 		return dapm->platform->card->snd_card;
181 	else
182 		BUG();
183 
184 	/* unreachable */
185 	return NULL;
186 }
187 
188 /* get soc_card from DAPM context */
189 static inline struct snd_soc_card *dapm_get_soc_card(
190 		struct snd_soc_dapm_context *dapm)
191 {
192 	if (dapm->codec)
193 		return dapm->codec->card;
194 	else if (dapm->platform)
195 		return dapm->platform->card;
196 	else
197 		BUG();
198 
199 	/* unreachable */
200 	return NULL;
201 }
202 
203 static void dapm_reset(struct snd_soc_card *card)
204 {
205 	struct snd_soc_dapm_widget *w;
206 
207 	memset(&card->dapm_stats, 0, sizeof(card->dapm_stats));
208 
209 	list_for_each_entry(w, &card->widgets, list) {
210 		w->power_checked = false;
211 		w->inputs = -1;
212 		w->outputs = -1;
213 	}
214 }
215 
216 static int soc_widget_read(struct snd_soc_dapm_widget *w, int reg)
217 {
218 	if (w->codec)
219 		return snd_soc_read(w->codec, reg);
220 	else if (w->platform)
221 		return snd_soc_platform_read(w->platform, reg);
222 
223 	dev_err(w->dapm->dev, "ASoC: no valid widget read method\n");
224 	return -1;
225 }
226 
227 static int soc_widget_write(struct snd_soc_dapm_widget *w, int reg, int val)
228 {
229 	if (w->codec)
230 		return snd_soc_write(w->codec, reg, val);
231 	else if (w->platform)
232 		return snd_soc_platform_write(w->platform, reg, val);
233 
234 	dev_err(w->dapm->dev, "ASoC: no valid widget write method\n");
235 	return -1;
236 }
237 
238 static inline void soc_widget_lock(struct snd_soc_dapm_widget *w)
239 {
240 	if (w->codec && !w->codec->using_regmap)
241 		mutex_lock(&w->codec->mutex);
242 	else if (w->platform)
243 		mutex_lock(&w->platform->mutex);
244 }
245 
246 static inline void soc_widget_unlock(struct snd_soc_dapm_widget *w)
247 {
248 	if (w->codec && !w->codec->using_regmap)
249 		mutex_unlock(&w->codec->mutex);
250 	else if (w->platform)
251 		mutex_unlock(&w->platform->mutex);
252 }
253 
254 static int soc_widget_update_bits_locked(struct snd_soc_dapm_widget *w,
255 	unsigned short reg, unsigned int mask, unsigned int value)
256 {
257 	bool change;
258 	unsigned int old, new;
259 	int ret;
260 
261 	if (w->codec && w->codec->using_regmap) {
262 		ret = regmap_update_bits_check(w->codec->control_data,
263 					       reg, mask, value, &change);
264 		if (ret != 0)
265 			return ret;
266 	} else {
267 		soc_widget_lock(w);
268 		ret = soc_widget_read(w, reg);
269 		if (ret < 0) {
270 			soc_widget_unlock(w);
271 			return ret;
272 		}
273 
274 		old = ret;
275 		new = (old & ~mask) | (value & mask);
276 		change = old != new;
277 		if (change) {
278 			ret = soc_widget_write(w, reg, new);
279 			if (ret < 0) {
280 				soc_widget_unlock(w);
281 				return ret;
282 			}
283 		}
284 		soc_widget_unlock(w);
285 	}
286 
287 	return change;
288 }
289 
290 /**
291  * snd_soc_dapm_set_bias_level - set the bias level for the system
292  * @dapm: DAPM context
293  * @level: level to configure
294  *
295  * Configure the bias (power) levels for the SoC audio device.
296  *
297  * Returns 0 for success else error.
298  */
299 static int snd_soc_dapm_set_bias_level(struct snd_soc_dapm_context *dapm,
300 				       enum snd_soc_bias_level level)
301 {
302 	struct snd_soc_card *card = dapm->card;
303 	int ret = 0;
304 
305 	trace_snd_soc_bias_level_start(card, level);
306 
307 	if (card && card->set_bias_level)
308 		ret = card->set_bias_level(card, dapm, level);
309 	if (ret != 0)
310 		goto out;
311 
312 	if (dapm->codec) {
313 		if (dapm->codec->driver->set_bias_level)
314 			ret = dapm->codec->driver->set_bias_level(dapm->codec,
315 								  level);
316 		else
317 			dapm->bias_level = level;
318 	} else if (!card || dapm != &card->dapm) {
319 		dapm->bias_level = level;
320 	}
321 
322 	if (ret != 0)
323 		goto out;
324 
325 	if (card && card->set_bias_level_post)
326 		ret = card->set_bias_level_post(card, dapm, level);
327 out:
328 	trace_snd_soc_bias_level_done(card, level);
329 
330 	return ret;
331 }
332 
333 /* set up initial codec paths */
334 static void dapm_set_path_status(struct snd_soc_dapm_widget *w,
335 	struct snd_soc_dapm_path *p, int i)
336 {
337 	switch (w->id) {
338 	case snd_soc_dapm_switch:
339 	case snd_soc_dapm_mixer:
340 	case snd_soc_dapm_mixer_named_ctl: {
341 		int val;
342 		struct soc_mixer_control *mc = (struct soc_mixer_control *)
343 			w->kcontrol_news[i].private_value;
344 		unsigned int reg = mc->reg;
345 		unsigned int shift = mc->shift;
346 		int max = mc->max;
347 		unsigned int mask = (1 << fls(max)) - 1;
348 		unsigned int invert = mc->invert;
349 
350 		val = soc_widget_read(w, reg);
351 		val = (val >> shift) & mask;
352 		if (invert)
353 			val = max - val;
354 
355 		p->connect = !!val;
356 	}
357 	break;
358 	case snd_soc_dapm_mux: {
359 		struct soc_enum *e = (struct soc_enum *)
360 			w->kcontrol_news[i].private_value;
361 		int val, item;
362 
363 		val = soc_widget_read(w, e->reg);
364 		item = (val >> e->shift_l) & e->mask;
365 
366 		p->connect = 0;
367 		for (i = 0; i < e->max; i++) {
368 			if (!(strcmp(p->name, e->texts[i])) && item == i)
369 				p->connect = 1;
370 		}
371 	}
372 	break;
373 	case snd_soc_dapm_virt_mux: {
374 		struct soc_enum *e = (struct soc_enum *)
375 			w->kcontrol_news[i].private_value;
376 
377 		p->connect = 0;
378 		/* since a virtual mux has no backing registers to
379 		 * decide which path to connect, it will try to match
380 		 * with the first enumeration.  This is to ensure
381 		 * that the default mux choice (the first) will be
382 		 * correctly powered up during initialization.
383 		 */
384 		if (!strcmp(p->name, e->texts[0]))
385 			p->connect = 1;
386 	}
387 	break;
388 	case snd_soc_dapm_value_mux: {
389 		struct soc_enum *e = (struct soc_enum *)
390 			w->kcontrol_news[i].private_value;
391 		int val, item;
392 
393 		val = soc_widget_read(w, e->reg);
394 		val = (val >> e->shift_l) & e->mask;
395 		for (item = 0; item < e->max; item++) {
396 			if (val == e->values[item])
397 				break;
398 		}
399 
400 		p->connect = 0;
401 		for (i = 0; i < e->max; i++) {
402 			if (!(strcmp(p->name, e->texts[i])) && item == i)
403 				p->connect = 1;
404 		}
405 	}
406 	break;
407 	/* does not affect routing - always connected */
408 	case snd_soc_dapm_pga:
409 	case snd_soc_dapm_out_drv:
410 	case snd_soc_dapm_output:
411 	case snd_soc_dapm_adc:
412 	case snd_soc_dapm_input:
413 	case snd_soc_dapm_siggen:
414 	case snd_soc_dapm_dac:
415 	case snd_soc_dapm_micbias:
416 	case snd_soc_dapm_vmid:
417 	case snd_soc_dapm_supply:
418 	case snd_soc_dapm_regulator_supply:
419 	case snd_soc_dapm_clock_supply:
420 	case snd_soc_dapm_aif_in:
421 	case snd_soc_dapm_aif_out:
422 	case snd_soc_dapm_dai:
423 	case snd_soc_dapm_hp:
424 	case snd_soc_dapm_mic:
425 	case snd_soc_dapm_spk:
426 	case snd_soc_dapm_line:
427 	case snd_soc_dapm_dai_link:
428 		p->connect = 1;
429 	break;
430 	/* does affect routing - dynamically connected */
431 	case snd_soc_dapm_pre:
432 	case snd_soc_dapm_post:
433 		p->connect = 0;
434 	break;
435 	}
436 }
437 
438 /* connect mux widget to its interconnecting audio paths */
439 static int dapm_connect_mux(struct snd_soc_dapm_context *dapm,
440 	struct snd_soc_dapm_widget *src, struct snd_soc_dapm_widget *dest,
441 	struct snd_soc_dapm_path *path, const char *control_name,
442 	const struct snd_kcontrol_new *kcontrol)
443 {
444 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
445 	int i;
446 
447 	for (i = 0; i < e->max; i++) {
448 		if (!(strcmp(control_name, e->texts[i]))) {
449 			list_add(&path->list, &dapm->card->paths);
450 			list_add(&path->list_sink, &dest->sources);
451 			list_add(&path->list_source, &src->sinks);
452 			path->name = (char*)e->texts[i];
453 			dapm_set_path_status(dest, path, 0);
454 			return 0;
455 		}
456 	}
457 
458 	return -ENODEV;
459 }
460 
461 /* connect mixer widget to its interconnecting audio paths */
462 static int dapm_connect_mixer(struct snd_soc_dapm_context *dapm,
463 	struct snd_soc_dapm_widget *src, struct snd_soc_dapm_widget *dest,
464 	struct snd_soc_dapm_path *path, const char *control_name)
465 {
466 	int i;
467 
468 	/* search for mixer kcontrol */
469 	for (i = 0; i < dest->num_kcontrols; i++) {
470 		if (!strcmp(control_name, dest->kcontrol_news[i].name)) {
471 			list_add(&path->list, &dapm->card->paths);
472 			list_add(&path->list_sink, &dest->sources);
473 			list_add(&path->list_source, &src->sinks);
474 			path->name = dest->kcontrol_news[i].name;
475 			dapm_set_path_status(dest, path, i);
476 			return 0;
477 		}
478 	}
479 	return -ENODEV;
480 }
481 
482 static int dapm_is_shared_kcontrol(struct snd_soc_dapm_context *dapm,
483 	struct snd_soc_dapm_widget *kcontrolw,
484 	const struct snd_kcontrol_new *kcontrol_new,
485 	struct snd_kcontrol **kcontrol)
486 {
487 	struct snd_soc_dapm_widget *w;
488 	int i;
489 
490 	*kcontrol = NULL;
491 
492 	list_for_each_entry(w, &dapm->card->widgets, list) {
493 		if (w == kcontrolw || w->dapm != kcontrolw->dapm)
494 			continue;
495 		for (i = 0; i < w->num_kcontrols; i++) {
496 			if (&w->kcontrol_news[i] == kcontrol_new) {
497 				if (w->kcontrols)
498 					*kcontrol = w->kcontrols[i];
499 				return 1;
500 			}
501 		}
502 	}
503 
504 	return 0;
505 }
506 
507 /* create new dapm mixer control */
508 static int dapm_new_mixer(struct snd_soc_dapm_widget *w)
509 {
510 	struct snd_soc_dapm_context *dapm = w->dapm;
511 	int i, ret = 0;
512 	size_t name_len, prefix_len;
513 	struct snd_soc_dapm_path *path;
514 	struct snd_card *card = dapm->card->snd_card;
515 	const char *prefix;
516 	struct snd_soc_dapm_widget_list *wlist;
517 	size_t wlistsize;
518 
519 	if (dapm->codec)
520 		prefix = dapm->codec->name_prefix;
521 	else
522 		prefix = NULL;
523 
524 	if (prefix)
525 		prefix_len = strlen(prefix) + 1;
526 	else
527 		prefix_len = 0;
528 
529 	/* add kcontrol */
530 	for (i = 0; i < w->num_kcontrols; i++) {
531 
532 		/* match name */
533 		list_for_each_entry(path, &w->sources, list_sink) {
534 
535 			/* mixer/mux paths name must match control name */
536 			if (path->name != (char *)w->kcontrol_news[i].name)
537 				continue;
538 
539 			if (w->kcontrols[i]) {
540 				path->kcontrol = w->kcontrols[i];
541 				continue;
542 			}
543 
544 			wlistsize = sizeof(struct snd_soc_dapm_widget_list) +
545 				    sizeof(struct snd_soc_dapm_widget *),
546 			wlist = kzalloc(wlistsize, GFP_KERNEL);
547 			if (wlist == NULL) {
548 				dev_err(dapm->dev,
549 					"ASoC: can't allocate widget list for %s\n",
550 					w->name);
551 				return -ENOMEM;
552 			}
553 			wlist->num_widgets = 1;
554 			wlist->widgets[0] = w;
555 
556 			/* add dapm control with long name.
557 			 * for dapm_mixer this is the concatenation of the
558 			 * mixer and kcontrol name.
559 			 * for dapm_mixer_named_ctl this is simply the
560 			 * kcontrol name.
561 			 */
562 			name_len = strlen(w->kcontrol_news[i].name) + 1;
563 			if (w->id != snd_soc_dapm_mixer_named_ctl)
564 				name_len += 1 + strlen(w->name);
565 
566 			path->long_name = kmalloc(name_len, GFP_KERNEL);
567 
568 			if (path->long_name == NULL) {
569 				kfree(wlist);
570 				return -ENOMEM;
571 			}
572 
573 			switch (w->id) {
574 			default:
575 				/* The control will get a prefix from
576 				 * the control creation process but
577 				 * we're also using the same prefix
578 				 * for widgets so cut the prefix off
579 				 * the front of the widget name.
580 				 */
581 				snprintf((char *)path->long_name, name_len,
582 					 "%s %s", w->name + prefix_len,
583 					 w->kcontrol_news[i].name);
584 				break;
585 			case snd_soc_dapm_mixer_named_ctl:
586 				snprintf((char *)path->long_name, name_len,
587 					 "%s", w->kcontrol_news[i].name);
588 				break;
589 			}
590 
591 			((char *)path->long_name)[name_len - 1] = '\0';
592 
593 			path->kcontrol = snd_soc_cnew(&w->kcontrol_news[i],
594 						      wlist, path->long_name,
595 						      prefix);
596 			ret = snd_ctl_add(card, path->kcontrol);
597 			if (ret < 0) {
598 				dev_err(dapm->dev, "ASoC: failed to add widget"
599 					" %s dapm kcontrol %s: %d\n",
600 					w->name, path->long_name, ret);
601 				kfree(wlist);
602 				kfree(path->long_name);
603 				path->long_name = NULL;
604 				return ret;
605 			}
606 			w->kcontrols[i] = path->kcontrol;
607 		}
608 	}
609 	return ret;
610 }
611 
612 /* create new dapm mux control */
613 static int dapm_new_mux(struct snd_soc_dapm_widget *w)
614 {
615 	struct snd_soc_dapm_context *dapm = w->dapm;
616 	struct snd_soc_dapm_path *path = NULL;
617 	struct snd_kcontrol *kcontrol;
618 	struct snd_card *card = dapm->card->snd_card;
619 	const char *prefix;
620 	size_t prefix_len;
621 	int ret;
622 	struct snd_soc_dapm_widget_list *wlist;
623 	int shared, wlistentries;
624 	size_t wlistsize;
625 	const char *name;
626 
627 	if (w->num_kcontrols != 1) {
628 		dev_err(dapm->dev,
629 			"ASoC: mux %s has incorrect number of controls\n",
630 			w->name);
631 		return -EINVAL;
632 	}
633 
634 	shared = dapm_is_shared_kcontrol(dapm, w, &w->kcontrol_news[0],
635 					 &kcontrol);
636 	if (kcontrol) {
637 		wlist = kcontrol->private_data;
638 		wlistentries = wlist->num_widgets + 1;
639 	} else {
640 		wlist = NULL;
641 		wlistentries = 1;
642 	}
643 	wlistsize = sizeof(struct snd_soc_dapm_widget_list) +
644 		wlistentries * sizeof(struct snd_soc_dapm_widget *),
645 	wlist = krealloc(wlist, wlistsize, GFP_KERNEL);
646 	if (wlist == NULL) {
647 		dev_err(dapm->dev,
648 			"ASoC: can't allocate widget list for %s\n", w->name);
649 		return -ENOMEM;
650 	}
651 	wlist->num_widgets = wlistentries;
652 	wlist->widgets[wlistentries - 1] = w;
653 
654 	if (!kcontrol) {
655 		if (dapm->codec)
656 			prefix = dapm->codec->name_prefix;
657 		else
658 			prefix = NULL;
659 
660 		if (shared) {
661 			name = w->kcontrol_news[0].name;
662 			prefix_len = 0;
663 		} else {
664 			name = w->name;
665 			if (prefix)
666 				prefix_len = strlen(prefix) + 1;
667 			else
668 				prefix_len = 0;
669 		}
670 
671 		/*
672 		 * The control will get a prefix from the control creation
673 		 * process but we're also using the same prefix for widgets so
674 		 * cut the prefix off the front of the widget name.
675 		 */
676 		kcontrol = snd_soc_cnew(&w->kcontrol_news[0], wlist,
677 					name + prefix_len, prefix);
678 		ret = snd_ctl_add(card, kcontrol);
679 		if (ret < 0) {
680 			dev_err(dapm->dev, "ASoC: failed to add kcontrol %s: %d\n",
681 				w->name, ret);
682 			kfree(wlist);
683 			return ret;
684 		}
685 	}
686 
687 	kcontrol->private_data = wlist;
688 
689 	w->kcontrols[0] = kcontrol;
690 
691 	list_for_each_entry(path, &w->sources, list_sink)
692 		path->kcontrol = kcontrol;
693 
694 	return 0;
695 }
696 
697 /* create new dapm volume control */
698 static int dapm_new_pga(struct snd_soc_dapm_widget *w)
699 {
700 	if (w->num_kcontrols)
701 		dev_err(w->dapm->dev,
702 			"ASoC: PGA controls not supported: '%s'\n", w->name);
703 
704 	return 0;
705 }
706 
707 /* reset 'walked' bit for each dapm path */
708 static inline void dapm_clear_walk(struct snd_soc_dapm_context *dapm)
709 {
710 	struct snd_soc_dapm_path *p;
711 
712 	list_for_each_entry(p, &dapm->card->paths, list)
713 		p->walked = 0;
714 }
715 
716 /* We implement power down on suspend by checking the power state of
717  * the ALSA card - when we are suspending the ALSA state for the card
718  * is set to D3.
719  */
720 static int snd_soc_dapm_suspend_check(struct snd_soc_dapm_widget *widget)
721 {
722 	int level = snd_power_get_state(widget->dapm->card->snd_card);
723 
724 	switch (level) {
725 	case SNDRV_CTL_POWER_D3hot:
726 	case SNDRV_CTL_POWER_D3cold:
727 		if (widget->ignore_suspend)
728 			dev_dbg(widget->dapm->dev, "ASoC: %s ignoring suspend\n",
729 				widget->name);
730 		return widget->ignore_suspend;
731 	default:
732 		return 1;
733 	}
734 }
735 
736 /* add widget to list if it's not already in the list */
737 static int dapm_list_add_widget(struct snd_soc_dapm_widget_list **list,
738 	struct snd_soc_dapm_widget *w)
739 {
740 	struct snd_soc_dapm_widget_list *wlist;
741 	int wlistsize, wlistentries, i;
742 
743 	if (*list == NULL)
744 		return -EINVAL;
745 
746 	wlist = *list;
747 
748 	/* is this widget already in the list */
749 	for (i = 0; i < wlist->num_widgets; i++) {
750 		if (wlist->widgets[i] == w)
751 			return 0;
752 	}
753 
754 	/* allocate some new space */
755 	wlistentries = wlist->num_widgets + 1;
756 	wlistsize = sizeof(struct snd_soc_dapm_widget_list) +
757 			wlistentries * sizeof(struct snd_soc_dapm_widget *);
758 	*list = krealloc(wlist, wlistsize, GFP_KERNEL);
759 	if (*list == NULL) {
760 		dev_err(w->dapm->dev, "ASoC: can't allocate widget list for %s\n",
761 			w->name);
762 		return -ENOMEM;
763 	}
764 	wlist = *list;
765 
766 	/* insert the widget */
767 	dev_dbg(w->dapm->dev, "ASoC: added %s in widget list pos %d\n",
768 			w->name, wlist->num_widgets);
769 
770 	wlist->widgets[wlist->num_widgets] = w;
771 	wlist->num_widgets++;
772 	return 1;
773 }
774 
775 /*
776  * Recursively check for a completed path to an active or physically connected
777  * output widget. Returns number of complete paths.
778  */
779 static int is_connected_output_ep(struct snd_soc_dapm_widget *widget,
780 	struct snd_soc_dapm_widget_list **list)
781 {
782 	struct snd_soc_dapm_path *path;
783 	int con = 0;
784 
785 	if (widget->outputs >= 0)
786 		return widget->outputs;
787 
788 	DAPM_UPDATE_STAT(widget, path_checks);
789 
790 	switch (widget->id) {
791 	case snd_soc_dapm_supply:
792 	case snd_soc_dapm_regulator_supply:
793 	case snd_soc_dapm_clock_supply:
794 		return 0;
795 	default:
796 		break;
797 	}
798 
799 	switch (widget->id) {
800 	case snd_soc_dapm_adc:
801 	case snd_soc_dapm_aif_out:
802 	case snd_soc_dapm_dai:
803 		if (widget->active) {
804 			widget->outputs = snd_soc_dapm_suspend_check(widget);
805 			return widget->outputs;
806 		}
807 	default:
808 		break;
809 	}
810 
811 	if (widget->connected) {
812 		/* connected pin ? */
813 		if (widget->id == snd_soc_dapm_output && !widget->ext) {
814 			widget->outputs = snd_soc_dapm_suspend_check(widget);
815 			return widget->outputs;
816 		}
817 
818 		/* connected jack or spk ? */
819 		if (widget->id == snd_soc_dapm_hp ||
820 		    widget->id == snd_soc_dapm_spk ||
821 		    (widget->id == snd_soc_dapm_line &&
822 		     !list_empty(&widget->sources))) {
823 			widget->outputs = snd_soc_dapm_suspend_check(widget);
824 			return widget->outputs;
825 		}
826 	}
827 
828 	list_for_each_entry(path, &widget->sinks, list_source) {
829 		DAPM_UPDATE_STAT(widget, neighbour_checks);
830 
831 		if (path->weak)
832 			continue;
833 
834 		if (path->walked)
835 			continue;
836 
837 		trace_snd_soc_dapm_output_path(widget, path);
838 
839 		if (path->sink && path->connect) {
840 			path->walked = 1;
841 
842 			/* do we need to add this widget to the list ? */
843 			if (list) {
844 				int err;
845 				err = dapm_list_add_widget(list, path->sink);
846 				if (err < 0) {
847 					dev_err(widget->dapm->dev,
848 						"ASoC: could not add widget %s\n",
849 						widget->name);
850 					return con;
851 				}
852 			}
853 
854 			con += is_connected_output_ep(path->sink, list);
855 		}
856 	}
857 
858 	widget->outputs = con;
859 
860 	return con;
861 }
862 
863 /*
864  * Recursively check for a completed path to an active or physically connected
865  * input widget. Returns number of complete paths.
866  */
867 static int is_connected_input_ep(struct snd_soc_dapm_widget *widget,
868 	struct snd_soc_dapm_widget_list **list)
869 {
870 	struct snd_soc_dapm_path *path;
871 	int con = 0;
872 
873 	if (widget->inputs >= 0)
874 		return widget->inputs;
875 
876 	DAPM_UPDATE_STAT(widget, path_checks);
877 
878 	switch (widget->id) {
879 	case snd_soc_dapm_supply:
880 	case snd_soc_dapm_regulator_supply:
881 	case snd_soc_dapm_clock_supply:
882 		return 0;
883 	default:
884 		break;
885 	}
886 
887 	/* active stream ? */
888 	switch (widget->id) {
889 	case snd_soc_dapm_dac:
890 	case snd_soc_dapm_aif_in:
891 	case snd_soc_dapm_dai:
892 		if (widget->active) {
893 			widget->inputs = snd_soc_dapm_suspend_check(widget);
894 			return widget->inputs;
895 		}
896 	default:
897 		break;
898 	}
899 
900 	if (widget->connected) {
901 		/* connected pin ? */
902 		if (widget->id == snd_soc_dapm_input && !widget->ext) {
903 			widget->inputs = snd_soc_dapm_suspend_check(widget);
904 			return widget->inputs;
905 		}
906 
907 		/* connected VMID/Bias for lower pops */
908 		if (widget->id == snd_soc_dapm_vmid) {
909 			widget->inputs = snd_soc_dapm_suspend_check(widget);
910 			return widget->inputs;
911 		}
912 
913 		/* connected jack ? */
914 		if (widget->id == snd_soc_dapm_mic ||
915 		    (widget->id == snd_soc_dapm_line &&
916 		     !list_empty(&widget->sinks))) {
917 			widget->inputs = snd_soc_dapm_suspend_check(widget);
918 			return widget->inputs;
919 		}
920 
921 		/* signal generator */
922 		if (widget->id == snd_soc_dapm_siggen) {
923 			widget->inputs = snd_soc_dapm_suspend_check(widget);
924 			return widget->inputs;
925 		}
926 	}
927 
928 	list_for_each_entry(path, &widget->sources, list_sink) {
929 		DAPM_UPDATE_STAT(widget, neighbour_checks);
930 
931 		if (path->weak)
932 			continue;
933 
934 		if (path->walked)
935 			continue;
936 
937 		trace_snd_soc_dapm_input_path(widget, path);
938 
939 		if (path->source && path->connect) {
940 			path->walked = 1;
941 
942 			/* do we need to add this widget to the list ? */
943 			if (list) {
944 				int err;
945 				err = dapm_list_add_widget(list, path->source);
946 				if (err < 0) {
947 					dev_err(widget->dapm->dev,
948 						"ASoC: could not add widget %s\n",
949 						widget->name);
950 					return con;
951 				}
952 			}
953 
954 			con += is_connected_input_ep(path->source, list);
955 		}
956 	}
957 
958 	widget->inputs = con;
959 
960 	return con;
961 }
962 
963 /**
964  * snd_soc_dapm_get_connected_widgets - query audio path and it's widgets.
965  * @dai: the soc DAI.
966  * @stream: stream direction.
967  * @list: list of active widgets for this stream.
968  *
969  * Queries DAPM graph as to whether an valid audio stream path exists for
970  * the initial stream specified by name. This takes into account
971  * current mixer and mux kcontrol settings. Creates list of valid widgets.
972  *
973  * Returns the number of valid paths or negative error.
974  */
975 int snd_soc_dapm_dai_get_connected_widgets(struct snd_soc_dai *dai, int stream,
976 	struct snd_soc_dapm_widget_list **list)
977 {
978 	struct snd_soc_card *card = dai->card;
979 	int paths;
980 
981 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
982 	dapm_reset(card);
983 
984 	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
985 		paths = is_connected_output_ep(dai->playback_widget, list);
986 	else
987 		paths = is_connected_input_ep(dai->capture_widget, list);
988 
989 	trace_snd_soc_dapm_connected(paths, stream);
990 	dapm_clear_walk(&card->dapm);
991 	mutex_unlock(&card->dapm_mutex);
992 
993 	return paths;
994 }
995 
996 /*
997  * Handler for generic register modifier widget.
998  */
999 int dapm_reg_event(struct snd_soc_dapm_widget *w,
1000 		   struct snd_kcontrol *kcontrol, int event)
1001 {
1002 	unsigned int val;
1003 
1004 	if (SND_SOC_DAPM_EVENT_ON(event))
1005 		val = w->on_val;
1006 	else
1007 		val = w->off_val;
1008 
1009 	soc_widget_update_bits_locked(w, -(w->reg + 1),
1010 			    w->mask << w->shift, val << w->shift);
1011 
1012 	return 0;
1013 }
1014 EXPORT_SYMBOL_GPL(dapm_reg_event);
1015 
1016 /*
1017  * Handler for regulator supply widget.
1018  */
1019 int dapm_regulator_event(struct snd_soc_dapm_widget *w,
1020 		   struct snd_kcontrol *kcontrol, int event)
1021 {
1022 	int ret;
1023 
1024 	if (SND_SOC_DAPM_EVENT_ON(event)) {
1025 		if (w->invert & SND_SOC_DAPM_REGULATOR_BYPASS) {
1026 			ret = regulator_allow_bypass(w->regulator, true);
1027 			if (ret != 0)
1028 				dev_warn(w->dapm->dev,
1029 					 "ASoC: Failed to bypass %s: %d\n",
1030 					 w->name, ret);
1031 		}
1032 
1033 		return regulator_enable(w->regulator);
1034 	} else {
1035 		if (w->invert & SND_SOC_DAPM_REGULATOR_BYPASS) {
1036 			ret = regulator_allow_bypass(w->regulator, false);
1037 			if (ret != 0)
1038 				dev_warn(w->dapm->dev,
1039 					 "ASoC: Failed to unbypass %s: %d\n",
1040 					 w->name, ret);
1041 		}
1042 
1043 		return regulator_disable_deferred(w->regulator, w->shift);
1044 	}
1045 }
1046 EXPORT_SYMBOL_GPL(dapm_regulator_event);
1047 
1048 /*
1049  * Handler for clock supply widget.
1050  */
1051 int dapm_clock_event(struct snd_soc_dapm_widget *w,
1052 		   struct snd_kcontrol *kcontrol, int event)
1053 {
1054 	if (!w->clk)
1055 		return -EIO;
1056 
1057 #ifdef CONFIG_HAVE_CLK
1058 	if (SND_SOC_DAPM_EVENT_ON(event)) {
1059 		return clk_enable(w->clk);
1060 	} else {
1061 		clk_disable(w->clk);
1062 		return 0;
1063 	}
1064 #endif
1065 	return 0;
1066 }
1067 EXPORT_SYMBOL_GPL(dapm_clock_event);
1068 
1069 static int dapm_widget_power_check(struct snd_soc_dapm_widget *w)
1070 {
1071 	if (w->power_checked)
1072 		return w->new_power;
1073 
1074 	if (w->force)
1075 		w->new_power = 1;
1076 	else
1077 		w->new_power = w->power_check(w);
1078 
1079 	w->power_checked = true;
1080 
1081 	return w->new_power;
1082 }
1083 
1084 /* Generic check to see if a widget should be powered.
1085  */
1086 static int dapm_generic_check_power(struct snd_soc_dapm_widget *w)
1087 {
1088 	int in, out;
1089 
1090 	DAPM_UPDATE_STAT(w, power_checks);
1091 
1092 	in = is_connected_input_ep(w, NULL);
1093 	dapm_clear_walk(w->dapm);
1094 	out = is_connected_output_ep(w, NULL);
1095 	dapm_clear_walk(w->dapm);
1096 	return out != 0 && in != 0;
1097 }
1098 
1099 static int dapm_dai_check_power(struct snd_soc_dapm_widget *w)
1100 {
1101 	DAPM_UPDATE_STAT(w, power_checks);
1102 
1103 	if (w->active)
1104 		return w->active;
1105 
1106 	return dapm_generic_check_power(w);
1107 }
1108 
1109 /* Check to see if an ADC has power */
1110 static int dapm_adc_check_power(struct snd_soc_dapm_widget *w)
1111 {
1112 	int in;
1113 
1114 	DAPM_UPDATE_STAT(w, power_checks);
1115 
1116 	if (w->active) {
1117 		in = is_connected_input_ep(w, NULL);
1118 		dapm_clear_walk(w->dapm);
1119 		return in != 0;
1120 	} else {
1121 		return dapm_generic_check_power(w);
1122 	}
1123 }
1124 
1125 /* Check to see if a DAC has power */
1126 static int dapm_dac_check_power(struct snd_soc_dapm_widget *w)
1127 {
1128 	int out;
1129 
1130 	DAPM_UPDATE_STAT(w, power_checks);
1131 
1132 	if (w->active) {
1133 		out = is_connected_output_ep(w, NULL);
1134 		dapm_clear_walk(w->dapm);
1135 		return out != 0;
1136 	} else {
1137 		return dapm_generic_check_power(w);
1138 	}
1139 }
1140 
1141 /* Check to see if a power supply is needed */
1142 static int dapm_supply_check_power(struct snd_soc_dapm_widget *w)
1143 {
1144 	struct snd_soc_dapm_path *path;
1145 
1146 	DAPM_UPDATE_STAT(w, power_checks);
1147 
1148 	/* Check if one of our outputs is connected */
1149 	list_for_each_entry(path, &w->sinks, list_source) {
1150 		DAPM_UPDATE_STAT(w, neighbour_checks);
1151 
1152 		if (path->weak)
1153 			continue;
1154 
1155 		if (path->connected &&
1156 		    !path->connected(path->source, path->sink))
1157 			continue;
1158 
1159 		if (!path->sink)
1160 			continue;
1161 
1162 		if (dapm_widget_power_check(path->sink))
1163 			return 1;
1164 	}
1165 
1166 	dapm_clear_walk(w->dapm);
1167 
1168 	return 0;
1169 }
1170 
1171 static int dapm_always_on_check_power(struct snd_soc_dapm_widget *w)
1172 {
1173 	return 1;
1174 }
1175 
1176 static int dapm_seq_compare(struct snd_soc_dapm_widget *a,
1177 			    struct snd_soc_dapm_widget *b,
1178 			    bool power_up)
1179 {
1180 	int *sort;
1181 
1182 	if (power_up)
1183 		sort = dapm_up_seq;
1184 	else
1185 		sort = dapm_down_seq;
1186 
1187 	if (sort[a->id] != sort[b->id])
1188 		return sort[a->id] - sort[b->id];
1189 	if (a->subseq != b->subseq) {
1190 		if (power_up)
1191 			return a->subseq - b->subseq;
1192 		else
1193 			return b->subseq - a->subseq;
1194 	}
1195 	if (a->reg != b->reg)
1196 		return a->reg - b->reg;
1197 	if (a->dapm != b->dapm)
1198 		return (unsigned long)a->dapm - (unsigned long)b->dapm;
1199 
1200 	return 0;
1201 }
1202 
1203 /* Insert a widget in order into a DAPM power sequence. */
1204 static void dapm_seq_insert(struct snd_soc_dapm_widget *new_widget,
1205 			    struct list_head *list,
1206 			    bool power_up)
1207 {
1208 	struct snd_soc_dapm_widget *w;
1209 
1210 	list_for_each_entry(w, list, power_list)
1211 		if (dapm_seq_compare(new_widget, w, power_up) < 0) {
1212 			list_add_tail(&new_widget->power_list, &w->power_list);
1213 			return;
1214 		}
1215 
1216 	list_add_tail(&new_widget->power_list, list);
1217 }
1218 
1219 static void dapm_seq_check_event(struct snd_soc_dapm_context *dapm,
1220 				 struct snd_soc_dapm_widget *w, int event)
1221 {
1222 	struct snd_soc_card *card = dapm->card;
1223 	const char *ev_name;
1224 	int power, ret;
1225 
1226 	switch (event) {
1227 	case SND_SOC_DAPM_PRE_PMU:
1228 		ev_name = "PRE_PMU";
1229 		power = 1;
1230 		break;
1231 	case SND_SOC_DAPM_POST_PMU:
1232 		ev_name = "POST_PMU";
1233 		power = 1;
1234 		break;
1235 	case SND_SOC_DAPM_PRE_PMD:
1236 		ev_name = "PRE_PMD";
1237 		power = 0;
1238 		break;
1239 	case SND_SOC_DAPM_POST_PMD:
1240 		ev_name = "POST_PMD";
1241 		power = 0;
1242 		break;
1243 	default:
1244 		BUG();
1245 		return;
1246 	}
1247 
1248 	if (w->power != power)
1249 		return;
1250 
1251 	if (w->event && (w->event_flags & event)) {
1252 		pop_dbg(dapm->dev, card->pop_time, "pop test : %s %s\n",
1253 			w->name, ev_name);
1254 		trace_snd_soc_dapm_widget_event_start(w, event);
1255 		ret = w->event(w, NULL, event);
1256 		trace_snd_soc_dapm_widget_event_done(w, event);
1257 		if (ret < 0)
1258 			dev_err(dapm->dev, "ASoC: %s: %s event failed: %d\n",
1259 			       ev_name, w->name, ret);
1260 	}
1261 }
1262 
1263 /* Apply the coalesced changes from a DAPM sequence */
1264 static void dapm_seq_run_coalesced(struct snd_soc_dapm_context *dapm,
1265 				   struct list_head *pending)
1266 {
1267 	struct snd_soc_card *card = dapm->card;
1268 	struct snd_soc_dapm_widget *w;
1269 	int reg, power;
1270 	unsigned int value = 0;
1271 	unsigned int mask = 0;
1272 	unsigned int cur_mask;
1273 
1274 	reg = list_first_entry(pending, struct snd_soc_dapm_widget,
1275 			       power_list)->reg;
1276 
1277 	list_for_each_entry(w, pending, power_list) {
1278 		cur_mask = 1 << w->shift;
1279 		BUG_ON(reg != w->reg);
1280 
1281 		if (w->invert)
1282 			power = !w->power;
1283 		else
1284 			power = w->power;
1285 
1286 		mask |= cur_mask;
1287 		if (power)
1288 			value |= cur_mask;
1289 
1290 		pop_dbg(dapm->dev, card->pop_time,
1291 			"pop test : Queue %s: reg=0x%x, 0x%x/0x%x\n",
1292 			w->name, reg, value, mask);
1293 
1294 		/* Check for events */
1295 		dapm_seq_check_event(dapm, w, SND_SOC_DAPM_PRE_PMU);
1296 		dapm_seq_check_event(dapm, w, SND_SOC_DAPM_PRE_PMD);
1297 	}
1298 
1299 	if (reg >= 0) {
1300 		/* Any widget will do, they should all be updating the
1301 		 * same register.
1302 		 */
1303 		w = list_first_entry(pending, struct snd_soc_dapm_widget,
1304 				     power_list);
1305 
1306 		pop_dbg(dapm->dev, card->pop_time,
1307 			"pop test : Applying 0x%x/0x%x to %x in %dms\n",
1308 			value, mask, reg, card->pop_time);
1309 		pop_wait(card->pop_time);
1310 		soc_widget_update_bits_locked(w, reg, mask, value);
1311 	}
1312 
1313 	list_for_each_entry(w, pending, power_list) {
1314 		dapm_seq_check_event(dapm, w, SND_SOC_DAPM_POST_PMU);
1315 		dapm_seq_check_event(dapm, w, SND_SOC_DAPM_POST_PMD);
1316 	}
1317 }
1318 
1319 /* Apply a DAPM power sequence.
1320  *
1321  * We walk over a pre-sorted list of widgets to apply power to.  In
1322  * order to minimise the number of writes to the device required
1323  * multiple widgets will be updated in a single write where possible.
1324  * Currently anything that requires more than a single write is not
1325  * handled.
1326  */
1327 static void dapm_seq_run(struct snd_soc_dapm_context *dapm,
1328 			 struct list_head *list, int event, bool power_up)
1329 {
1330 	struct snd_soc_dapm_widget *w, *n;
1331 	LIST_HEAD(pending);
1332 	int cur_sort = -1;
1333 	int cur_subseq = -1;
1334 	int cur_reg = SND_SOC_NOPM;
1335 	struct snd_soc_dapm_context *cur_dapm = NULL;
1336 	int ret, i;
1337 	int *sort;
1338 
1339 	if (power_up)
1340 		sort = dapm_up_seq;
1341 	else
1342 		sort = dapm_down_seq;
1343 
1344 	list_for_each_entry_safe(w, n, list, power_list) {
1345 		ret = 0;
1346 
1347 		/* Do we need to apply any queued changes? */
1348 		if (sort[w->id] != cur_sort || w->reg != cur_reg ||
1349 		    w->dapm != cur_dapm || w->subseq != cur_subseq) {
1350 			if (!list_empty(&pending))
1351 				dapm_seq_run_coalesced(cur_dapm, &pending);
1352 
1353 			if (cur_dapm && cur_dapm->seq_notifier) {
1354 				for (i = 0; i < ARRAY_SIZE(dapm_up_seq); i++)
1355 					if (sort[i] == cur_sort)
1356 						cur_dapm->seq_notifier(cur_dapm,
1357 								       i,
1358 								       cur_subseq);
1359 			}
1360 
1361 			INIT_LIST_HEAD(&pending);
1362 			cur_sort = -1;
1363 			cur_subseq = INT_MIN;
1364 			cur_reg = SND_SOC_NOPM;
1365 			cur_dapm = NULL;
1366 		}
1367 
1368 		switch (w->id) {
1369 		case snd_soc_dapm_pre:
1370 			if (!w->event)
1371 				list_for_each_entry_safe_continue(w, n, list,
1372 								  power_list);
1373 
1374 			if (event == SND_SOC_DAPM_STREAM_START)
1375 				ret = w->event(w,
1376 					       NULL, SND_SOC_DAPM_PRE_PMU);
1377 			else if (event == SND_SOC_DAPM_STREAM_STOP)
1378 				ret = w->event(w,
1379 					       NULL, SND_SOC_DAPM_PRE_PMD);
1380 			break;
1381 
1382 		case snd_soc_dapm_post:
1383 			if (!w->event)
1384 				list_for_each_entry_safe_continue(w, n, list,
1385 								  power_list);
1386 
1387 			if (event == SND_SOC_DAPM_STREAM_START)
1388 				ret = w->event(w,
1389 					       NULL, SND_SOC_DAPM_POST_PMU);
1390 			else if (event == SND_SOC_DAPM_STREAM_STOP)
1391 				ret = w->event(w,
1392 					       NULL, SND_SOC_DAPM_POST_PMD);
1393 			break;
1394 
1395 		default:
1396 			/* Queue it up for application */
1397 			cur_sort = sort[w->id];
1398 			cur_subseq = w->subseq;
1399 			cur_reg = w->reg;
1400 			cur_dapm = w->dapm;
1401 			list_move(&w->power_list, &pending);
1402 			break;
1403 		}
1404 
1405 		if (ret < 0)
1406 			dev_err(w->dapm->dev,
1407 				"ASoC: Failed to apply widget power: %d\n", ret);
1408 	}
1409 
1410 	if (!list_empty(&pending))
1411 		dapm_seq_run_coalesced(cur_dapm, &pending);
1412 
1413 	if (cur_dapm && cur_dapm->seq_notifier) {
1414 		for (i = 0; i < ARRAY_SIZE(dapm_up_seq); i++)
1415 			if (sort[i] == cur_sort)
1416 				cur_dapm->seq_notifier(cur_dapm,
1417 						       i, cur_subseq);
1418 	}
1419 }
1420 
1421 static void dapm_widget_update(struct snd_soc_dapm_context *dapm)
1422 {
1423 	struct snd_soc_dapm_update *update = dapm->update;
1424 	struct snd_soc_dapm_widget *w;
1425 	int ret;
1426 
1427 	if (!update)
1428 		return;
1429 
1430 	w = update->widget;
1431 
1432 	if (w->event &&
1433 	    (w->event_flags & SND_SOC_DAPM_PRE_REG)) {
1434 		ret = w->event(w, update->kcontrol, SND_SOC_DAPM_PRE_REG);
1435 		if (ret != 0)
1436 			dev_err(dapm->dev, "ASoC: %s DAPM pre-event failed: %d\n",
1437 			       w->name, ret);
1438 	}
1439 
1440 	ret = soc_widget_update_bits_locked(w, update->reg, update->mask,
1441 				  update->val);
1442 	if (ret < 0)
1443 		dev_err(dapm->dev, "ASoC: %s DAPM update failed: %d\n",
1444 			w->name, ret);
1445 
1446 	if (w->event &&
1447 	    (w->event_flags & SND_SOC_DAPM_POST_REG)) {
1448 		ret = w->event(w, update->kcontrol, SND_SOC_DAPM_POST_REG);
1449 		if (ret != 0)
1450 			dev_err(dapm->dev, "ASoC: %s DAPM post-event failed: %d\n",
1451 			       w->name, ret);
1452 	}
1453 }
1454 
1455 /* Async callback run prior to DAPM sequences - brings to _PREPARE if
1456  * they're changing state.
1457  */
1458 static void dapm_pre_sequence_async(void *data, async_cookie_t cookie)
1459 {
1460 	struct snd_soc_dapm_context *d = data;
1461 	int ret;
1462 
1463 	/* If we're off and we're not supposed to be go into STANDBY */
1464 	if (d->bias_level == SND_SOC_BIAS_OFF &&
1465 	    d->target_bias_level != SND_SOC_BIAS_OFF) {
1466 		if (d->dev)
1467 			pm_runtime_get_sync(d->dev);
1468 
1469 		ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_STANDBY);
1470 		if (ret != 0)
1471 			dev_err(d->dev,
1472 				"ASoC: Failed to turn on bias: %d\n", ret);
1473 	}
1474 
1475 	/* Prepare for a STADDBY->ON or ON->STANDBY transition */
1476 	if (d->bias_level != d->target_bias_level) {
1477 		ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_PREPARE);
1478 		if (ret != 0)
1479 			dev_err(d->dev,
1480 				"ASoC: Failed to prepare bias: %d\n", ret);
1481 	}
1482 }
1483 
1484 /* Async callback run prior to DAPM sequences - brings to their final
1485  * state.
1486  */
1487 static void dapm_post_sequence_async(void *data, async_cookie_t cookie)
1488 {
1489 	struct snd_soc_dapm_context *d = data;
1490 	int ret;
1491 
1492 	/* If we just powered the last thing off drop to standby bias */
1493 	if (d->bias_level == SND_SOC_BIAS_PREPARE &&
1494 	    (d->target_bias_level == SND_SOC_BIAS_STANDBY ||
1495 	     d->target_bias_level == SND_SOC_BIAS_OFF)) {
1496 		ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_STANDBY);
1497 		if (ret != 0)
1498 			dev_err(d->dev, "ASoC: Failed to apply standby bias: %d\n",
1499 				ret);
1500 	}
1501 
1502 	/* If we're in standby and can support bias off then do that */
1503 	if (d->bias_level == SND_SOC_BIAS_STANDBY &&
1504 	    d->target_bias_level == SND_SOC_BIAS_OFF) {
1505 		ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_OFF);
1506 		if (ret != 0)
1507 			dev_err(d->dev, "ASoC: Failed to turn off bias: %d\n",
1508 				ret);
1509 
1510 		if (d->dev)
1511 			pm_runtime_put(d->dev);
1512 	}
1513 
1514 	/* If we just powered up then move to active bias */
1515 	if (d->bias_level == SND_SOC_BIAS_PREPARE &&
1516 	    d->target_bias_level == SND_SOC_BIAS_ON) {
1517 		ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_ON);
1518 		if (ret != 0)
1519 			dev_err(d->dev, "ASoC: Failed to apply active bias: %d\n",
1520 				ret);
1521 	}
1522 }
1523 
1524 static void dapm_widget_set_peer_power(struct snd_soc_dapm_widget *peer,
1525 				       bool power, bool connect)
1526 {
1527 	/* If a connection is being made or broken then that update
1528 	 * will have marked the peer dirty, otherwise the widgets are
1529 	 * not connected and this update has no impact. */
1530 	if (!connect)
1531 		return;
1532 
1533 	/* If the peer is already in the state we're moving to then we
1534 	 * won't have an impact on it. */
1535 	if (power != peer->power)
1536 		dapm_mark_dirty(peer, "peer state change");
1537 }
1538 
1539 static void dapm_widget_set_power(struct snd_soc_dapm_widget *w, bool power,
1540 				  struct list_head *up_list,
1541 				  struct list_head *down_list)
1542 {
1543 	struct snd_soc_dapm_path *path;
1544 
1545 	if (w->power == power)
1546 		return;
1547 
1548 	trace_snd_soc_dapm_widget_power(w, power);
1549 
1550 	/* If we changed our power state perhaps our neigbours changed
1551 	 * also.
1552 	 */
1553 	list_for_each_entry(path, &w->sources, list_sink) {
1554 		if (path->source) {
1555 			dapm_widget_set_peer_power(path->source, power,
1556 						   path->connect);
1557 		}
1558 	}
1559 	switch (w->id) {
1560 	case snd_soc_dapm_supply:
1561 	case snd_soc_dapm_regulator_supply:
1562 	case snd_soc_dapm_clock_supply:
1563 		/* Supplies can't affect their outputs, only their inputs */
1564 		break;
1565 	default:
1566 		list_for_each_entry(path, &w->sinks, list_source) {
1567 			if (path->sink) {
1568 				dapm_widget_set_peer_power(path->sink, power,
1569 							   path->connect);
1570 			}
1571 		}
1572 		break;
1573 	}
1574 
1575 	if (power)
1576 		dapm_seq_insert(w, up_list, true);
1577 	else
1578 		dapm_seq_insert(w, down_list, false);
1579 
1580 	w->power = power;
1581 }
1582 
1583 static void dapm_power_one_widget(struct snd_soc_dapm_widget *w,
1584 				  struct list_head *up_list,
1585 				  struct list_head *down_list)
1586 {
1587 	int power;
1588 
1589 	switch (w->id) {
1590 	case snd_soc_dapm_pre:
1591 		dapm_seq_insert(w, down_list, false);
1592 		break;
1593 	case snd_soc_dapm_post:
1594 		dapm_seq_insert(w, up_list, true);
1595 		break;
1596 
1597 	default:
1598 		power = dapm_widget_power_check(w);
1599 
1600 		dapm_widget_set_power(w, power, up_list, down_list);
1601 		break;
1602 	}
1603 }
1604 
1605 /*
1606  * Scan each dapm widget for complete audio path.
1607  * A complete path is a route that has valid endpoints i.e.:-
1608  *
1609  *  o DAC to output pin.
1610  *  o Input Pin to ADC.
1611  *  o Input pin to Output pin (bypass, sidetone)
1612  *  o DAC to ADC (loopback).
1613  */
1614 static int dapm_power_widgets(struct snd_soc_dapm_context *dapm, int event)
1615 {
1616 	struct snd_soc_card *card = dapm->card;
1617 	struct snd_soc_dapm_widget *w;
1618 	struct snd_soc_dapm_context *d;
1619 	LIST_HEAD(up_list);
1620 	LIST_HEAD(down_list);
1621 	ASYNC_DOMAIN_EXCLUSIVE(async_domain);
1622 	enum snd_soc_bias_level bias;
1623 
1624 	trace_snd_soc_dapm_start(card);
1625 
1626 	list_for_each_entry(d, &card->dapm_list, list) {
1627 		if (d->idle_bias_off)
1628 			d->target_bias_level = SND_SOC_BIAS_OFF;
1629 		else
1630 			d->target_bias_level = SND_SOC_BIAS_STANDBY;
1631 	}
1632 
1633 	dapm_reset(card);
1634 
1635 	/* Check which widgets we need to power and store them in
1636 	 * lists indicating if they should be powered up or down.  We
1637 	 * only check widgets that have been flagged as dirty but note
1638 	 * that new widgets may be added to the dirty list while we
1639 	 * iterate.
1640 	 */
1641 	list_for_each_entry(w, &card->dapm_dirty, dirty) {
1642 		dapm_power_one_widget(w, &up_list, &down_list);
1643 	}
1644 
1645 	list_for_each_entry(w, &card->widgets, list) {
1646 		switch (w->id) {
1647 		case snd_soc_dapm_pre:
1648 		case snd_soc_dapm_post:
1649 			/* These widgets always need to be powered */
1650 			break;
1651 		default:
1652 			list_del_init(&w->dirty);
1653 			break;
1654 		}
1655 
1656 		if (w->power) {
1657 			d = w->dapm;
1658 
1659 			/* Supplies and micbiases only bring the
1660 			 * context up to STANDBY as unless something
1661 			 * else is active and passing audio they
1662 			 * generally don't require full power.  Signal
1663 			 * generators are virtual pins and have no
1664 			 * power impact themselves.
1665 			 */
1666 			switch (w->id) {
1667 			case snd_soc_dapm_siggen:
1668 				break;
1669 			case snd_soc_dapm_supply:
1670 			case snd_soc_dapm_regulator_supply:
1671 			case snd_soc_dapm_clock_supply:
1672 			case snd_soc_dapm_micbias:
1673 				if (d->target_bias_level < SND_SOC_BIAS_STANDBY)
1674 					d->target_bias_level = SND_SOC_BIAS_STANDBY;
1675 				break;
1676 			default:
1677 				d->target_bias_level = SND_SOC_BIAS_ON;
1678 				break;
1679 			}
1680 		}
1681 
1682 	}
1683 
1684 	/* Force all contexts in the card to the same bias state if
1685 	 * they're not ground referenced.
1686 	 */
1687 	bias = SND_SOC_BIAS_OFF;
1688 	list_for_each_entry(d, &card->dapm_list, list)
1689 		if (d->target_bias_level > bias)
1690 			bias = d->target_bias_level;
1691 	list_for_each_entry(d, &card->dapm_list, list)
1692 		if (!d->idle_bias_off)
1693 			d->target_bias_level = bias;
1694 
1695 	trace_snd_soc_dapm_walk_done(card);
1696 
1697 	/* Run all the bias changes in parallel */
1698 	list_for_each_entry(d, &dapm->card->dapm_list, list)
1699 		async_schedule_domain(dapm_pre_sequence_async, d,
1700 					&async_domain);
1701 	async_synchronize_full_domain(&async_domain);
1702 
1703 	/* Power down widgets first; try to avoid amplifying pops. */
1704 	dapm_seq_run(dapm, &down_list, event, false);
1705 
1706 	dapm_widget_update(dapm);
1707 
1708 	/* Now power up. */
1709 	dapm_seq_run(dapm, &up_list, event, true);
1710 
1711 	/* Run all the bias changes in parallel */
1712 	list_for_each_entry(d, &dapm->card->dapm_list, list)
1713 		async_schedule_domain(dapm_post_sequence_async, d,
1714 					&async_domain);
1715 	async_synchronize_full_domain(&async_domain);
1716 
1717 	/* do we need to notify any clients that DAPM event is complete */
1718 	list_for_each_entry(d, &card->dapm_list, list) {
1719 		if (d->stream_event)
1720 			d->stream_event(d, event);
1721 	}
1722 
1723 	pop_dbg(dapm->dev, card->pop_time,
1724 		"DAPM sequencing finished, waiting %dms\n", card->pop_time);
1725 	pop_wait(card->pop_time);
1726 
1727 	trace_snd_soc_dapm_done(card);
1728 
1729 	return 0;
1730 }
1731 
1732 #ifdef CONFIG_DEBUG_FS
1733 static ssize_t dapm_widget_power_read_file(struct file *file,
1734 					   char __user *user_buf,
1735 					   size_t count, loff_t *ppos)
1736 {
1737 	struct snd_soc_dapm_widget *w = file->private_data;
1738 	char *buf;
1739 	int in, out;
1740 	ssize_t ret;
1741 	struct snd_soc_dapm_path *p = NULL;
1742 
1743 	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
1744 	if (!buf)
1745 		return -ENOMEM;
1746 
1747 	in = is_connected_input_ep(w, NULL);
1748 	dapm_clear_walk(w->dapm);
1749 	out = is_connected_output_ep(w, NULL);
1750 	dapm_clear_walk(w->dapm);
1751 
1752 	ret = snprintf(buf, PAGE_SIZE, "%s: %s%s  in %d out %d",
1753 		       w->name, w->power ? "On" : "Off",
1754 		       w->force ? " (forced)" : "", in, out);
1755 
1756 	if (w->reg >= 0)
1757 		ret += snprintf(buf + ret, PAGE_SIZE - ret,
1758 				" - R%d(0x%x) bit %d",
1759 				w->reg, w->reg, w->shift);
1760 
1761 	ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
1762 
1763 	if (w->sname)
1764 		ret += snprintf(buf + ret, PAGE_SIZE - ret, " stream %s %s\n",
1765 				w->sname,
1766 				w->active ? "active" : "inactive");
1767 
1768 	list_for_each_entry(p, &w->sources, list_sink) {
1769 		if (p->connected && !p->connected(w, p->sink))
1770 			continue;
1771 
1772 		if (p->connect)
1773 			ret += snprintf(buf + ret, PAGE_SIZE - ret,
1774 					" in  \"%s\" \"%s\"\n",
1775 					p->name ? p->name : "static",
1776 					p->source->name);
1777 	}
1778 	list_for_each_entry(p, &w->sinks, list_source) {
1779 		if (p->connected && !p->connected(w, p->sink))
1780 			continue;
1781 
1782 		if (p->connect)
1783 			ret += snprintf(buf + ret, PAGE_SIZE - ret,
1784 					" out \"%s\" \"%s\"\n",
1785 					p->name ? p->name : "static",
1786 					p->sink->name);
1787 	}
1788 
1789 	ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
1790 
1791 	kfree(buf);
1792 	return ret;
1793 }
1794 
1795 static const struct file_operations dapm_widget_power_fops = {
1796 	.open = simple_open,
1797 	.read = dapm_widget_power_read_file,
1798 	.llseek = default_llseek,
1799 };
1800 
1801 static ssize_t dapm_bias_read_file(struct file *file, char __user *user_buf,
1802 				   size_t count, loff_t *ppos)
1803 {
1804 	struct snd_soc_dapm_context *dapm = file->private_data;
1805 	char *level;
1806 
1807 	switch (dapm->bias_level) {
1808 	case SND_SOC_BIAS_ON:
1809 		level = "On\n";
1810 		break;
1811 	case SND_SOC_BIAS_PREPARE:
1812 		level = "Prepare\n";
1813 		break;
1814 	case SND_SOC_BIAS_STANDBY:
1815 		level = "Standby\n";
1816 		break;
1817 	case SND_SOC_BIAS_OFF:
1818 		level = "Off\n";
1819 		break;
1820 	default:
1821 		BUG();
1822 		level = "Unknown\n";
1823 		break;
1824 	}
1825 
1826 	return simple_read_from_buffer(user_buf, count, ppos, level,
1827 				       strlen(level));
1828 }
1829 
1830 static const struct file_operations dapm_bias_fops = {
1831 	.open = simple_open,
1832 	.read = dapm_bias_read_file,
1833 	.llseek = default_llseek,
1834 };
1835 
1836 void snd_soc_dapm_debugfs_init(struct snd_soc_dapm_context *dapm,
1837 	struct dentry *parent)
1838 {
1839 	struct dentry *d;
1840 
1841 	dapm->debugfs_dapm = debugfs_create_dir("dapm", parent);
1842 
1843 	if (!dapm->debugfs_dapm) {
1844 		dev_warn(dapm->dev,
1845 		       "ASoC: Failed to create DAPM debugfs directory\n");
1846 		return;
1847 	}
1848 
1849 	d = debugfs_create_file("bias_level", 0444,
1850 				dapm->debugfs_dapm, dapm,
1851 				&dapm_bias_fops);
1852 	if (!d)
1853 		dev_warn(dapm->dev,
1854 			 "ASoC: Failed to create bias level debugfs file\n");
1855 }
1856 
1857 static void dapm_debugfs_add_widget(struct snd_soc_dapm_widget *w)
1858 {
1859 	struct snd_soc_dapm_context *dapm = w->dapm;
1860 	struct dentry *d;
1861 
1862 	if (!dapm->debugfs_dapm || !w->name)
1863 		return;
1864 
1865 	d = debugfs_create_file(w->name, 0444,
1866 				dapm->debugfs_dapm, w,
1867 				&dapm_widget_power_fops);
1868 	if (!d)
1869 		dev_warn(w->dapm->dev,
1870 			"ASoC: Failed to create %s debugfs file\n",
1871 			w->name);
1872 }
1873 
1874 static void dapm_debugfs_cleanup(struct snd_soc_dapm_context *dapm)
1875 {
1876 	debugfs_remove_recursive(dapm->debugfs_dapm);
1877 }
1878 
1879 #else
1880 void snd_soc_dapm_debugfs_init(struct snd_soc_dapm_context *dapm,
1881 	struct dentry *parent)
1882 {
1883 }
1884 
1885 static inline void dapm_debugfs_add_widget(struct snd_soc_dapm_widget *w)
1886 {
1887 }
1888 
1889 static inline void dapm_debugfs_cleanup(struct snd_soc_dapm_context *dapm)
1890 {
1891 }
1892 
1893 #endif
1894 
1895 /* test and update the power status of a mux widget */
1896 static int soc_dapm_mux_update_power(struct snd_soc_dapm_widget *widget,
1897 				 struct snd_kcontrol *kcontrol, int mux, struct soc_enum *e)
1898 {
1899 	struct snd_soc_dapm_path *path;
1900 	int found = 0;
1901 
1902 	if (widget->id != snd_soc_dapm_mux &&
1903 	    widget->id != snd_soc_dapm_virt_mux &&
1904 	    widget->id != snd_soc_dapm_value_mux)
1905 		return -ENODEV;
1906 
1907 	/* find dapm widget path assoc with kcontrol */
1908 	list_for_each_entry(path, &widget->dapm->card->paths, list) {
1909 		if (path->kcontrol != kcontrol)
1910 			continue;
1911 
1912 		if (!path->name || !e->texts[mux])
1913 			continue;
1914 
1915 		found = 1;
1916 		/* we now need to match the string in the enum to the path */
1917 		if (!(strcmp(path->name, e->texts[mux]))) {
1918 			path->connect = 1; /* new connection */
1919 			dapm_mark_dirty(path->source, "mux connection");
1920 		} else {
1921 			if (path->connect)
1922 				dapm_mark_dirty(path->source,
1923 						"mux disconnection");
1924 			path->connect = 0; /* old connection must be powered down */
1925 		}
1926 	}
1927 
1928 	if (found) {
1929 		dapm_mark_dirty(widget, "mux change");
1930 		dapm_power_widgets(widget->dapm, SND_SOC_DAPM_STREAM_NOP);
1931 	}
1932 
1933 	return found;
1934 }
1935 
1936 int snd_soc_dapm_mux_update_power(struct snd_soc_dapm_widget *widget,
1937 		struct snd_kcontrol *kcontrol, int mux, struct soc_enum *e)
1938 {
1939 	struct snd_soc_card *card = widget->dapm->card;
1940 	int ret;
1941 
1942 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
1943 	ret = soc_dapm_mux_update_power(widget, kcontrol, mux, e);
1944 	mutex_unlock(&card->dapm_mutex);
1945 	if (ret > 0)
1946 		soc_dpcm_runtime_update(widget);
1947 	return ret;
1948 }
1949 EXPORT_SYMBOL_GPL(snd_soc_dapm_mux_update_power);
1950 
1951 /* test and update the power status of a mixer or switch widget */
1952 static int soc_dapm_mixer_update_power(struct snd_soc_dapm_widget *widget,
1953 				   struct snd_kcontrol *kcontrol, int connect)
1954 {
1955 	struct snd_soc_dapm_path *path;
1956 	int found = 0;
1957 
1958 	if (widget->id != snd_soc_dapm_mixer &&
1959 	    widget->id != snd_soc_dapm_mixer_named_ctl &&
1960 	    widget->id != snd_soc_dapm_switch)
1961 		return -ENODEV;
1962 
1963 	/* find dapm widget path assoc with kcontrol */
1964 	list_for_each_entry(path, &widget->dapm->card->paths, list) {
1965 		if (path->kcontrol != kcontrol)
1966 			continue;
1967 
1968 		/* found, now check type */
1969 		found = 1;
1970 		path->connect = connect;
1971 		dapm_mark_dirty(path->source, "mixer connection");
1972 	}
1973 
1974 	if (found) {
1975 		dapm_mark_dirty(widget, "mixer update");
1976 		dapm_power_widgets(widget->dapm, SND_SOC_DAPM_STREAM_NOP);
1977 	}
1978 
1979 	return found;
1980 }
1981 
1982 int snd_soc_dapm_mixer_update_power(struct snd_soc_dapm_widget *widget,
1983 				struct snd_kcontrol *kcontrol, int connect)
1984 {
1985 	struct snd_soc_card *card = widget->dapm->card;
1986 	int ret;
1987 
1988 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
1989 	ret = soc_dapm_mixer_update_power(widget, kcontrol, connect);
1990 	mutex_unlock(&card->dapm_mutex);
1991 	if (ret > 0)
1992 		soc_dpcm_runtime_update(widget);
1993 	return ret;
1994 }
1995 EXPORT_SYMBOL_GPL(snd_soc_dapm_mixer_update_power);
1996 
1997 /* show dapm widget status in sys fs */
1998 static ssize_t dapm_widget_show(struct device *dev,
1999 	struct device_attribute *attr, char *buf)
2000 {
2001 	struct snd_soc_pcm_runtime *rtd = dev_get_drvdata(dev);
2002 	struct snd_soc_codec *codec =rtd->codec;
2003 	struct snd_soc_dapm_widget *w;
2004 	int count = 0;
2005 	char *state = "not set";
2006 
2007 	list_for_each_entry(w, &codec->card->widgets, list) {
2008 		if (w->dapm != &codec->dapm)
2009 			continue;
2010 
2011 		/* only display widgets that burnm power */
2012 		switch (w->id) {
2013 		case snd_soc_dapm_hp:
2014 		case snd_soc_dapm_mic:
2015 		case snd_soc_dapm_spk:
2016 		case snd_soc_dapm_line:
2017 		case snd_soc_dapm_micbias:
2018 		case snd_soc_dapm_dac:
2019 		case snd_soc_dapm_adc:
2020 		case snd_soc_dapm_pga:
2021 		case snd_soc_dapm_out_drv:
2022 		case snd_soc_dapm_mixer:
2023 		case snd_soc_dapm_mixer_named_ctl:
2024 		case snd_soc_dapm_supply:
2025 		case snd_soc_dapm_regulator_supply:
2026 		case snd_soc_dapm_clock_supply:
2027 			if (w->name)
2028 				count += sprintf(buf + count, "%s: %s\n",
2029 					w->name, w->power ? "On":"Off");
2030 		break;
2031 		default:
2032 		break;
2033 		}
2034 	}
2035 
2036 	switch (codec->dapm.bias_level) {
2037 	case SND_SOC_BIAS_ON:
2038 		state = "On";
2039 		break;
2040 	case SND_SOC_BIAS_PREPARE:
2041 		state = "Prepare";
2042 		break;
2043 	case SND_SOC_BIAS_STANDBY:
2044 		state = "Standby";
2045 		break;
2046 	case SND_SOC_BIAS_OFF:
2047 		state = "Off";
2048 		break;
2049 	}
2050 	count += sprintf(buf + count, "PM State: %s\n", state);
2051 
2052 	return count;
2053 }
2054 
2055 static DEVICE_ATTR(dapm_widget, 0444, dapm_widget_show, NULL);
2056 
2057 int snd_soc_dapm_sys_add(struct device *dev)
2058 {
2059 	return device_create_file(dev, &dev_attr_dapm_widget);
2060 }
2061 
2062 static void snd_soc_dapm_sys_remove(struct device *dev)
2063 {
2064 	device_remove_file(dev, &dev_attr_dapm_widget);
2065 }
2066 
2067 /* free all dapm widgets and resources */
2068 static void dapm_free_widgets(struct snd_soc_dapm_context *dapm)
2069 {
2070 	struct snd_soc_dapm_widget *w, *next_w;
2071 	struct snd_soc_dapm_path *p, *next_p;
2072 
2073 	list_for_each_entry_safe(w, next_w, &dapm->card->widgets, list) {
2074 		if (w->dapm != dapm)
2075 			continue;
2076 		list_del(&w->list);
2077 		/*
2078 		 * remove source and sink paths associated to this widget.
2079 		 * While removing the path, remove reference to it from both
2080 		 * source and sink widgets so that path is removed only once.
2081 		 */
2082 		list_for_each_entry_safe(p, next_p, &w->sources, list_sink) {
2083 			list_del(&p->list_sink);
2084 			list_del(&p->list_source);
2085 			list_del(&p->list);
2086 			kfree(p->long_name);
2087 			kfree(p);
2088 		}
2089 		list_for_each_entry_safe(p, next_p, &w->sinks, list_source) {
2090 			list_del(&p->list_sink);
2091 			list_del(&p->list_source);
2092 			list_del(&p->list);
2093 			kfree(p->long_name);
2094 			kfree(p);
2095 		}
2096 		kfree(w->kcontrols);
2097 		kfree(w->name);
2098 		kfree(w);
2099 	}
2100 }
2101 
2102 static struct snd_soc_dapm_widget *dapm_find_widget(
2103 			struct snd_soc_dapm_context *dapm, const char *pin,
2104 			bool search_other_contexts)
2105 {
2106 	struct snd_soc_dapm_widget *w;
2107 	struct snd_soc_dapm_widget *fallback = NULL;
2108 
2109 	list_for_each_entry(w, &dapm->card->widgets, list) {
2110 		if (!strcmp(w->name, pin)) {
2111 			if (w->dapm == dapm)
2112 				return w;
2113 			else
2114 				fallback = w;
2115 		}
2116 	}
2117 
2118 	if (search_other_contexts)
2119 		return fallback;
2120 
2121 	return NULL;
2122 }
2123 
2124 static int snd_soc_dapm_set_pin(struct snd_soc_dapm_context *dapm,
2125 				const char *pin, int status)
2126 {
2127 	struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);
2128 
2129 	if (!w) {
2130 		dev_err(dapm->dev, "ASoC: DAPM unknown pin %s\n", pin);
2131 		return -EINVAL;
2132 	}
2133 
2134 	if (w->connected != status)
2135 		dapm_mark_dirty(w, "pin configuration");
2136 
2137 	w->connected = status;
2138 	if (status == 0)
2139 		w->force = 0;
2140 
2141 	return 0;
2142 }
2143 
2144 /**
2145  * snd_soc_dapm_sync - scan and power dapm paths
2146  * @dapm: DAPM context
2147  *
2148  * Walks all dapm audio paths and powers widgets according to their
2149  * stream or path usage.
2150  *
2151  * Returns 0 for success.
2152  */
2153 int snd_soc_dapm_sync(struct snd_soc_dapm_context *dapm)
2154 {
2155 	int ret;
2156 
2157 	/*
2158 	 * Suppress early reports (eg, jacks syncing their state) to avoid
2159 	 * silly DAPM runs during card startup.
2160 	 */
2161 	if (!dapm->card || !dapm->card->instantiated)
2162 		return 0;
2163 
2164 	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2165 	ret = dapm_power_widgets(dapm, SND_SOC_DAPM_STREAM_NOP);
2166 	mutex_unlock(&dapm->card->dapm_mutex);
2167 	return ret;
2168 }
2169 EXPORT_SYMBOL_GPL(snd_soc_dapm_sync);
2170 
2171 static int snd_soc_dapm_add_route(struct snd_soc_dapm_context *dapm,
2172 				  const struct snd_soc_dapm_route *route)
2173 {
2174 	struct snd_soc_dapm_path *path;
2175 	struct snd_soc_dapm_widget *wsource = NULL, *wsink = NULL, *w;
2176 	struct snd_soc_dapm_widget *wtsource = NULL, *wtsink = NULL;
2177 	const char *sink;
2178 	const char *control = route->control;
2179 	const char *source;
2180 	char prefixed_sink[80];
2181 	char prefixed_source[80];
2182 	int ret = 0;
2183 
2184 	if (dapm->codec && dapm->codec->name_prefix) {
2185 		snprintf(prefixed_sink, sizeof(prefixed_sink), "%s %s",
2186 			 dapm->codec->name_prefix, route->sink);
2187 		sink = prefixed_sink;
2188 		snprintf(prefixed_source, sizeof(prefixed_source), "%s %s",
2189 			 dapm->codec->name_prefix, route->source);
2190 		source = prefixed_source;
2191 	} else {
2192 		sink = route->sink;
2193 		source = route->source;
2194 	}
2195 
2196 	/*
2197 	 * find src and dest widgets over all widgets but favor a widget from
2198 	 * current DAPM context
2199 	 */
2200 	list_for_each_entry(w, &dapm->card->widgets, list) {
2201 		if (!wsink && !(strcmp(w->name, sink))) {
2202 			wtsink = w;
2203 			if (w->dapm == dapm)
2204 				wsink = w;
2205 			continue;
2206 		}
2207 		if (!wsource && !(strcmp(w->name, source))) {
2208 			wtsource = w;
2209 			if (w->dapm == dapm)
2210 				wsource = w;
2211 		}
2212 	}
2213 	/* use widget from another DAPM context if not found from this */
2214 	if (!wsink)
2215 		wsink = wtsink;
2216 	if (!wsource)
2217 		wsource = wtsource;
2218 
2219 	if (wsource == NULL) {
2220 		dev_err(dapm->dev, "ASoC: no source widget found for %s\n",
2221 			route->source);
2222 		return -ENODEV;
2223 	}
2224 	if (wsink == NULL) {
2225 		dev_err(dapm->dev, "ASoC: no sink widget found for %s\n",
2226 			route->sink);
2227 		return -ENODEV;
2228 	}
2229 
2230 	path = kzalloc(sizeof(struct snd_soc_dapm_path), GFP_KERNEL);
2231 	if (!path)
2232 		return -ENOMEM;
2233 
2234 	path->source = wsource;
2235 	path->sink = wsink;
2236 	path->connected = route->connected;
2237 	INIT_LIST_HEAD(&path->list);
2238 	INIT_LIST_HEAD(&path->list_source);
2239 	INIT_LIST_HEAD(&path->list_sink);
2240 
2241 	/* check for external widgets */
2242 	if (wsink->id == snd_soc_dapm_input) {
2243 		if (wsource->id == snd_soc_dapm_micbias ||
2244 			wsource->id == snd_soc_dapm_mic ||
2245 			wsource->id == snd_soc_dapm_line ||
2246 			wsource->id == snd_soc_dapm_output)
2247 			wsink->ext = 1;
2248 	}
2249 	if (wsource->id == snd_soc_dapm_output) {
2250 		if (wsink->id == snd_soc_dapm_spk ||
2251 			wsink->id == snd_soc_dapm_hp ||
2252 			wsink->id == snd_soc_dapm_line ||
2253 			wsink->id == snd_soc_dapm_input)
2254 			wsource->ext = 1;
2255 	}
2256 
2257 	/* connect static paths */
2258 	if (control == NULL) {
2259 		list_add(&path->list, &dapm->card->paths);
2260 		list_add(&path->list_sink, &wsink->sources);
2261 		list_add(&path->list_source, &wsource->sinks);
2262 		path->connect = 1;
2263 		return 0;
2264 	}
2265 
2266 	/* connect dynamic paths */
2267 	switch (wsink->id) {
2268 	case snd_soc_dapm_adc:
2269 	case snd_soc_dapm_dac:
2270 	case snd_soc_dapm_pga:
2271 	case snd_soc_dapm_out_drv:
2272 	case snd_soc_dapm_input:
2273 	case snd_soc_dapm_output:
2274 	case snd_soc_dapm_siggen:
2275 	case snd_soc_dapm_micbias:
2276 	case snd_soc_dapm_vmid:
2277 	case snd_soc_dapm_pre:
2278 	case snd_soc_dapm_post:
2279 	case snd_soc_dapm_supply:
2280 	case snd_soc_dapm_regulator_supply:
2281 	case snd_soc_dapm_clock_supply:
2282 	case snd_soc_dapm_aif_in:
2283 	case snd_soc_dapm_aif_out:
2284 	case snd_soc_dapm_dai:
2285 	case snd_soc_dapm_dai_link:
2286 		list_add(&path->list, &dapm->card->paths);
2287 		list_add(&path->list_sink, &wsink->sources);
2288 		list_add(&path->list_source, &wsource->sinks);
2289 		path->connect = 1;
2290 		return 0;
2291 	case snd_soc_dapm_mux:
2292 	case snd_soc_dapm_virt_mux:
2293 	case snd_soc_dapm_value_mux:
2294 		ret = dapm_connect_mux(dapm, wsource, wsink, path, control,
2295 			&wsink->kcontrol_news[0]);
2296 		if (ret != 0)
2297 			goto err;
2298 		break;
2299 	case snd_soc_dapm_switch:
2300 	case snd_soc_dapm_mixer:
2301 	case snd_soc_dapm_mixer_named_ctl:
2302 		ret = dapm_connect_mixer(dapm, wsource, wsink, path, control);
2303 		if (ret != 0)
2304 			goto err;
2305 		break;
2306 	case snd_soc_dapm_hp:
2307 	case snd_soc_dapm_mic:
2308 	case snd_soc_dapm_line:
2309 	case snd_soc_dapm_spk:
2310 		list_add(&path->list, &dapm->card->paths);
2311 		list_add(&path->list_sink, &wsink->sources);
2312 		list_add(&path->list_source, &wsource->sinks);
2313 		path->connect = 0;
2314 		return 0;
2315 	}
2316 
2317 	dapm_mark_dirty(wsource, "Route added");
2318 	dapm_mark_dirty(wsink, "Route added");
2319 
2320 	return 0;
2321 
2322 err:
2323 	dev_warn(dapm->dev, "ASoC: no dapm match for %s --> %s --> %s\n",
2324 		 source, control, sink);
2325 	kfree(path);
2326 	return ret;
2327 }
2328 
2329 static int snd_soc_dapm_del_route(struct snd_soc_dapm_context *dapm,
2330 				  const struct snd_soc_dapm_route *route)
2331 {
2332 	struct snd_soc_dapm_path *path, *p;
2333 	const char *sink;
2334 	const char *source;
2335 	char prefixed_sink[80];
2336 	char prefixed_source[80];
2337 
2338 	if (route->control) {
2339 		dev_err(dapm->dev,
2340 			"ASoC: Removal of routes with controls not supported\n");
2341 		return -EINVAL;
2342 	}
2343 
2344 	if (dapm->codec && dapm->codec->name_prefix) {
2345 		snprintf(prefixed_sink, sizeof(prefixed_sink), "%s %s",
2346 			 dapm->codec->name_prefix, route->sink);
2347 		sink = prefixed_sink;
2348 		snprintf(prefixed_source, sizeof(prefixed_source), "%s %s",
2349 			 dapm->codec->name_prefix, route->source);
2350 		source = prefixed_source;
2351 	} else {
2352 		sink = route->sink;
2353 		source = route->source;
2354 	}
2355 
2356 	path = NULL;
2357 	list_for_each_entry(p, &dapm->card->paths, list) {
2358 		if (strcmp(p->source->name, source) != 0)
2359 			continue;
2360 		if (strcmp(p->sink->name, sink) != 0)
2361 			continue;
2362 		path = p;
2363 		break;
2364 	}
2365 
2366 	if (path) {
2367 		dapm_mark_dirty(path->source, "Route removed");
2368 		dapm_mark_dirty(path->sink, "Route removed");
2369 
2370 		list_del(&path->list);
2371 		list_del(&path->list_sink);
2372 		list_del(&path->list_source);
2373 		kfree(path);
2374 	} else {
2375 		dev_warn(dapm->dev, "ASoC: Route %s->%s does not exist\n",
2376 			 source, sink);
2377 	}
2378 
2379 	return 0;
2380 }
2381 
2382 /**
2383  * snd_soc_dapm_add_routes - Add routes between DAPM widgets
2384  * @dapm: DAPM context
2385  * @route: audio routes
2386  * @num: number of routes
2387  *
2388  * Connects 2 dapm widgets together via a named audio path. The sink is
2389  * the widget receiving the audio signal, whilst the source is the sender
2390  * of the audio signal.
2391  *
2392  * Returns 0 for success else error. On error all resources can be freed
2393  * with a call to snd_soc_card_free().
2394  */
2395 int snd_soc_dapm_add_routes(struct snd_soc_dapm_context *dapm,
2396 			    const struct snd_soc_dapm_route *route, int num)
2397 {
2398 	int i, r, ret = 0;
2399 
2400 	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
2401 	for (i = 0; i < num; i++) {
2402 		r = snd_soc_dapm_add_route(dapm, route);
2403 		if (r < 0) {
2404 			dev_err(dapm->dev, "ASoC: Failed to add route %s -> %s -> %s\n",
2405 				route->source,
2406 				route->control ? route->control : "direct",
2407 				route->sink);
2408 			ret = r;
2409 		}
2410 		route++;
2411 	}
2412 	mutex_unlock(&dapm->card->dapm_mutex);
2413 
2414 	return ret;
2415 }
2416 EXPORT_SYMBOL_GPL(snd_soc_dapm_add_routes);
2417 
2418 /**
2419  * snd_soc_dapm_del_routes - Remove routes between DAPM widgets
2420  * @dapm: DAPM context
2421  * @route: audio routes
2422  * @num: number of routes
2423  *
2424  * Removes routes from the DAPM context.
2425  */
2426 int snd_soc_dapm_del_routes(struct snd_soc_dapm_context *dapm,
2427 			    const struct snd_soc_dapm_route *route, int num)
2428 {
2429 	int i, ret = 0;
2430 
2431 	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
2432 	for (i = 0; i < num; i++) {
2433 		snd_soc_dapm_del_route(dapm, route);
2434 		route++;
2435 	}
2436 	mutex_unlock(&dapm->card->dapm_mutex);
2437 
2438 	return ret;
2439 }
2440 EXPORT_SYMBOL_GPL(snd_soc_dapm_del_routes);
2441 
2442 static int snd_soc_dapm_weak_route(struct snd_soc_dapm_context *dapm,
2443 				   const struct snd_soc_dapm_route *route)
2444 {
2445 	struct snd_soc_dapm_widget *source = dapm_find_widget(dapm,
2446 							      route->source,
2447 							      true);
2448 	struct snd_soc_dapm_widget *sink = dapm_find_widget(dapm,
2449 							    route->sink,
2450 							    true);
2451 	struct snd_soc_dapm_path *path;
2452 	int count = 0;
2453 
2454 	if (!source) {
2455 		dev_err(dapm->dev, "ASoC: Unable to find source %s for weak route\n",
2456 			route->source);
2457 		return -ENODEV;
2458 	}
2459 
2460 	if (!sink) {
2461 		dev_err(dapm->dev, "ASoC: Unable to find sink %s for weak route\n",
2462 			route->sink);
2463 		return -ENODEV;
2464 	}
2465 
2466 	if (route->control || route->connected)
2467 		dev_warn(dapm->dev, "ASoC: Ignoring control for weak route %s->%s\n",
2468 			 route->source, route->sink);
2469 
2470 	list_for_each_entry(path, &source->sinks, list_source) {
2471 		if (path->sink == sink) {
2472 			path->weak = 1;
2473 			count++;
2474 		}
2475 	}
2476 
2477 	if (count == 0)
2478 		dev_err(dapm->dev, "ASoC: No path found for weak route %s->%s\n",
2479 			route->source, route->sink);
2480 	if (count > 1)
2481 		dev_warn(dapm->dev, "ASoC: %d paths found for weak route %s->%s\n",
2482 			 count, route->source, route->sink);
2483 
2484 	return 0;
2485 }
2486 
2487 /**
2488  * snd_soc_dapm_weak_routes - Mark routes between DAPM widgets as weak
2489  * @dapm: DAPM context
2490  * @route: audio routes
2491  * @num: number of routes
2492  *
2493  * Mark existing routes matching those specified in the passed array
2494  * as being weak, meaning that they are ignored for the purpose of
2495  * power decisions.  The main intended use case is for sidetone paths
2496  * which couple audio between other independent paths if they are both
2497  * active in order to make the combination work better at the user
2498  * level but which aren't intended to be "used".
2499  *
2500  * Note that CODEC drivers should not use this as sidetone type paths
2501  * can frequently also be used as bypass paths.
2502  */
2503 int snd_soc_dapm_weak_routes(struct snd_soc_dapm_context *dapm,
2504 			     const struct snd_soc_dapm_route *route, int num)
2505 {
2506 	int i, err;
2507 	int ret = 0;
2508 
2509 	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
2510 	for (i = 0; i < num; i++) {
2511 		err = snd_soc_dapm_weak_route(dapm, route);
2512 		if (err)
2513 			ret = err;
2514 		route++;
2515 	}
2516 	mutex_unlock(&dapm->card->dapm_mutex);
2517 
2518 	return ret;
2519 }
2520 EXPORT_SYMBOL_GPL(snd_soc_dapm_weak_routes);
2521 
2522 /**
2523  * snd_soc_dapm_new_widgets - add new dapm widgets
2524  * @dapm: DAPM context
2525  *
2526  * Checks the codec for any new dapm widgets and creates them if found.
2527  *
2528  * Returns 0 for success.
2529  */
2530 int snd_soc_dapm_new_widgets(struct snd_soc_dapm_context *dapm)
2531 {
2532 	struct snd_soc_dapm_widget *w;
2533 	unsigned int val;
2534 
2535 	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
2536 
2537 	list_for_each_entry(w, &dapm->card->widgets, list)
2538 	{
2539 		if (w->new)
2540 			continue;
2541 
2542 		if (w->num_kcontrols) {
2543 			w->kcontrols = kzalloc(w->num_kcontrols *
2544 						sizeof(struct snd_kcontrol *),
2545 						GFP_KERNEL);
2546 			if (!w->kcontrols) {
2547 				mutex_unlock(&dapm->card->dapm_mutex);
2548 				return -ENOMEM;
2549 			}
2550 		}
2551 
2552 		switch(w->id) {
2553 		case snd_soc_dapm_switch:
2554 		case snd_soc_dapm_mixer:
2555 		case snd_soc_dapm_mixer_named_ctl:
2556 			dapm_new_mixer(w);
2557 			break;
2558 		case snd_soc_dapm_mux:
2559 		case snd_soc_dapm_virt_mux:
2560 		case snd_soc_dapm_value_mux:
2561 			dapm_new_mux(w);
2562 			break;
2563 		case snd_soc_dapm_pga:
2564 		case snd_soc_dapm_out_drv:
2565 			dapm_new_pga(w);
2566 			break;
2567 		default:
2568 			break;
2569 		}
2570 
2571 		/* Read the initial power state from the device */
2572 		if (w->reg >= 0) {
2573 			val = soc_widget_read(w, w->reg);
2574 			val &= 1 << w->shift;
2575 			if (w->invert)
2576 				val = !val;
2577 
2578 			if (val)
2579 				w->power = 1;
2580 		}
2581 
2582 		w->new = 1;
2583 
2584 		dapm_mark_dirty(w, "new widget");
2585 		dapm_debugfs_add_widget(w);
2586 	}
2587 
2588 	dapm_power_widgets(dapm, SND_SOC_DAPM_STREAM_NOP);
2589 	mutex_unlock(&dapm->card->dapm_mutex);
2590 	return 0;
2591 }
2592 EXPORT_SYMBOL_GPL(snd_soc_dapm_new_widgets);
2593 
2594 /**
2595  * snd_soc_dapm_get_volsw - dapm mixer get callback
2596  * @kcontrol: mixer control
2597  * @ucontrol: control element information
2598  *
2599  * Callback to get the value of a dapm mixer control.
2600  *
2601  * Returns 0 for success.
2602  */
2603 int snd_soc_dapm_get_volsw(struct snd_kcontrol *kcontrol,
2604 	struct snd_ctl_elem_value *ucontrol)
2605 {
2606 	struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2607 	struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2608 	struct soc_mixer_control *mc =
2609 		(struct soc_mixer_control *)kcontrol->private_value;
2610 	unsigned int reg = mc->reg;
2611 	unsigned int shift = mc->shift;
2612 	int max = mc->max;
2613 	unsigned int mask = (1 << fls(max)) - 1;
2614 	unsigned int invert = mc->invert;
2615 
2616 	if (snd_soc_volsw_is_stereo(mc))
2617 		dev_warn(widget->dapm->dev,
2618 			 "ASoC: Control '%s' is stereo, which is not supported\n",
2619 			 kcontrol->id.name);
2620 
2621 	ucontrol->value.integer.value[0] =
2622 		(snd_soc_read(widget->codec, reg) >> shift) & mask;
2623 	if (invert)
2624 		ucontrol->value.integer.value[0] =
2625 			max - ucontrol->value.integer.value[0];
2626 
2627 	return 0;
2628 }
2629 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_volsw);
2630 
2631 /**
2632  * snd_soc_dapm_put_volsw - dapm mixer set callback
2633  * @kcontrol: mixer control
2634  * @ucontrol: control element information
2635  *
2636  * Callback to set the value of a dapm mixer control.
2637  *
2638  * Returns 0 for success.
2639  */
2640 int snd_soc_dapm_put_volsw(struct snd_kcontrol *kcontrol,
2641 	struct snd_ctl_elem_value *ucontrol)
2642 {
2643 	struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2644 	struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2645 	struct snd_soc_codec *codec = widget->codec;
2646 	struct snd_soc_card *card = codec->card;
2647 	struct soc_mixer_control *mc =
2648 		(struct soc_mixer_control *)kcontrol->private_value;
2649 	unsigned int reg = mc->reg;
2650 	unsigned int shift = mc->shift;
2651 	int max = mc->max;
2652 	unsigned int mask = (1 << fls(max)) - 1;
2653 	unsigned int invert = mc->invert;
2654 	unsigned int val;
2655 	int connect, change;
2656 	struct snd_soc_dapm_update update;
2657 	int wi;
2658 
2659 	if (snd_soc_volsw_is_stereo(mc))
2660 		dev_warn(widget->dapm->dev,
2661 			 "ASoC: Control '%s' is stereo, which is not supported\n",
2662 			 kcontrol->id.name);
2663 
2664 	val = (ucontrol->value.integer.value[0] & mask);
2665 	connect = !!val;
2666 
2667 	if (invert)
2668 		val = max - val;
2669 	mask = mask << shift;
2670 	val = val << shift;
2671 
2672 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2673 
2674 	change = snd_soc_test_bits(widget->codec, reg, mask, val);
2675 	if (change) {
2676 		for (wi = 0; wi < wlist->num_widgets; wi++) {
2677 			widget = wlist->widgets[wi];
2678 
2679 			widget->value = val;
2680 
2681 			update.kcontrol = kcontrol;
2682 			update.widget = widget;
2683 			update.reg = reg;
2684 			update.mask = mask;
2685 			update.val = val;
2686 			widget->dapm->update = &update;
2687 
2688 			soc_dapm_mixer_update_power(widget, kcontrol, connect);
2689 
2690 			widget->dapm->update = NULL;
2691 		}
2692 	}
2693 
2694 	mutex_unlock(&card->dapm_mutex);
2695 	return 0;
2696 }
2697 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_volsw);
2698 
2699 /**
2700  * snd_soc_dapm_get_enum_double - dapm enumerated double mixer get callback
2701  * @kcontrol: mixer control
2702  * @ucontrol: control element information
2703  *
2704  * Callback to get the value of a dapm enumerated double mixer control.
2705  *
2706  * Returns 0 for success.
2707  */
2708 int snd_soc_dapm_get_enum_double(struct snd_kcontrol *kcontrol,
2709 	struct snd_ctl_elem_value *ucontrol)
2710 {
2711 	struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2712 	struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2713 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
2714 	unsigned int val;
2715 
2716 	val = snd_soc_read(widget->codec, e->reg);
2717 	ucontrol->value.enumerated.item[0] = (val >> e->shift_l) & e->mask;
2718 	if (e->shift_l != e->shift_r)
2719 		ucontrol->value.enumerated.item[1] =
2720 			(val >> e->shift_r) & e->mask;
2721 
2722 	return 0;
2723 }
2724 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_enum_double);
2725 
2726 /**
2727  * snd_soc_dapm_put_enum_double - dapm enumerated double mixer set callback
2728  * @kcontrol: mixer control
2729  * @ucontrol: control element information
2730  *
2731  * Callback to set the value of a dapm enumerated double mixer control.
2732  *
2733  * Returns 0 for success.
2734  */
2735 int snd_soc_dapm_put_enum_double(struct snd_kcontrol *kcontrol,
2736 	struct snd_ctl_elem_value *ucontrol)
2737 {
2738 	struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2739 	struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2740 	struct snd_soc_codec *codec = widget->codec;
2741 	struct snd_soc_card *card = codec->card;
2742 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
2743 	unsigned int val, mux, change;
2744 	unsigned int mask;
2745 	struct snd_soc_dapm_update update;
2746 	int wi;
2747 
2748 	if (ucontrol->value.enumerated.item[0] > e->max - 1)
2749 		return -EINVAL;
2750 	mux = ucontrol->value.enumerated.item[0];
2751 	val = mux << e->shift_l;
2752 	mask = e->mask << e->shift_l;
2753 	if (e->shift_l != e->shift_r) {
2754 		if (ucontrol->value.enumerated.item[1] > e->max - 1)
2755 			return -EINVAL;
2756 		val |= ucontrol->value.enumerated.item[1] << e->shift_r;
2757 		mask |= e->mask << e->shift_r;
2758 	}
2759 
2760 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2761 
2762 	change = snd_soc_test_bits(widget->codec, e->reg, mask, val);
2763 	if (change) {
2764 		for (wi = 0; wi < wlist->num_widgets; wi++) {
2765 			widget = wlist->widgets[wi];
2766 
2767 			widget->value = val;
2768 
2769 			update.kcontrol = kcontrol;
2770 			update.widget = widget;
2771 			update.reg = e->reg;
2772 			update.mask = mask;
2773 			update.val = val;
2774 			widget->dapm->update = &update;
2775 
2776 			soc_dapm_mux_update_power(widget, kcontrol, mux, e);
2777 
2778 			widget->dapm->update = NULL;
2779 		}
2780 	}
2781 
2782 	mutex_unlock(&card->dapm_mutex);
2783 	return change;
2784 }
2785 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_enum_double);
2786 
2787 /**
2788  * snd_soc_dapm_get_enum_virt - Get virtual DAPM mux
2789  * @kcontrol: mixer control
2790  * @ucontrol: control element information
2791  *
2792  * Returns 0 for success.
2793  */
2794 int snd_soc_dapm_get_enum_virt(struct snd_kcontrol *kcontrol,
2795 			       struct snd_ctl_elem_value *ucontrol)
2796 {
2797 	struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2798 	struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2799 
2800 	ucontrol->value.enumerated.item[0] = widget->value;
2801 
2802 	return 0;
2803 }
2804 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_enum_virt);
2805 
2806 /**
2807  * snd_soc_dapm_put_enum_virt - Set virtual DAPM mux
2808  * @kcontrol: mixer control
2809  * @ucontrol: control element information
2810  *
2811  * Returns 0 for success.
2812  */
2813 int snd_soc_dapm_put_enum_virt(struct snd_kcontrol *kcontrol,
2814 			       struct snd_ctl_elem_value *ucontrol)
2815 {
2816 	struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2817 	struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2818 	struct snd_soc_codec *codec = widget->codec;
2819 	struct snd_soc_card *card = codec->card;
2820 	struct soc_enum *e =
2821 		(struct soc_enum *)kcontrol->private_value;
2822 	int change;
2823 	int ret = 0;
2824 	int wi;
2825 
2826 	if (ucontrol->value.enumerated.item[0] >= e->max)
2827 		return -EINVAL;
2828 
2829 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2830 
2831 	change = widget->value != ucontrol->value.enumerated.item[0];
2832 	if (change) {
2833 		for (wi = 0; wi < wlist->num_widgets; wi++) {
2834 			widget = wlist->widgets[wi];
2835 
2836 			widget->value = ucontrol->value.enumerated.item[0];
2837 
2838 			soc_dapm_mux_update_power(widget, kcontrol, widget->value, e);
2839 		}
2840 	}
2841 
2842 	mutex_unlock(&card->dapm_mutex);
2843 	return ret;
2844 }
2845 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_enum_virt);
2846 
2847 /**
2848  * snd_soc_dapm_get_value_enum_double - dapm semi enumerated double mixer get
2849  *					callback
2850  * @kcontrol: mixer control
2851  * @ucontrol: control element information
2852  *
2853  * Callback to get the value of a dapm semi enumerated double mixer control.
2854  *
2855  * Semi enumerated mixer: the enumerated items are referred as values. Can be
2856  * used for handling bitfield coded enumeration for example.
2857  *
2858  * Returns 0 for success.
2859  */
2860 int snd_soc_dapm_get_value_enum_double(struct snd_kcontrol *kcontrol,
2861 	struct snd_ctl_elem_value *ucontrol)
2862 {
2863 	struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2864 	struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2865 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
2866 	unsigned int reg_val, val, mux;
2867 
2868 	reg_val = snd_soc_read(widget->codec, e->reg);
2869 	val = (reg_val >> e->shift_l) & e->mask;
2870 	for (mux = 0; mux < e->max; mux++) {
2871 		if (val == e->values[mux])
2872 			break;
2873 	}
2874 	ucontrol->value.enumerated.item[0] = mux;
2875 	if (e->shift_l != e->shift_r) {
2876 		val = (reg_val >> e->shift_r) & e->mask;
2877 		for (mux = 0; mux < e->max; mux++) {
2878 			if (val == e->values[mux])
2879 				break;
2880 		}
2881 		ucontrol->value.enumerated.item[1] = mux;
2882 	}
2883 
2884 	return 0;
2885 }
2886 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_value_enum_double);
2887 
2888 /**
2889  * snd_soc_dapm_put_value_enum_double - dapm semi enumerated double mixer set
2890  *					callback
2891  * @kcontrol: mixer control
2892  * @ucontrol: control element information
2893  *
2894  * Callback to set the value of a dapm semi enumerated double mixer control.
2895  *
2896  * Semi enumerated mixer: the enumerated items are referred as values. Can be
2897  * used for handling bitfield coded enumeration for example.
2898  *
2899  * Returns 0 for success.
2900  */
2901 int snd_soc_dapm_put_value_enum_double(struct snd_kcontrol *kcontrol,
2902 	struct snd_ctl_elem_value *ucontrol)
2903 {
2904 	struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2905 	struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2906 	struct snd_soc_codec *codec = widget->codec;
2907 	struct snd_soc_card *card = codec->card;
2908 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
2909 	unsigned int val, mux, change;
2910 	unsigned int mask;
2911 	struct snd_soc_dapm_update update;
2912 	int wi;
2913 
2914 	if (ucontrol->value.enumerated.item[0] > e->max - 1)
2915 		return -EINVAL;
2916 	mux = ucontrol->value.enumerated.item[0];
2917 	val = e->values[ucontrol->value.enumerated.item[0]] << e->shift_l;
2918 	mask = e->mask << e->shift_l;
2919 	if (e->shift_l != e->shift_r) {
2920 		if (ucontrol->value.enumerated.item[1] > e->max - 1)
2921 			return -EINVAL;
2922 		val |= e->values[ucontrol->value.enumerated.item[1]] << e->shift_r;
2923 		mask |= e->mask << e->shift_r;
2924 	}
2925 
2926 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2927 
2928 	change = snd_soc_test_bits(widget->codec, e->reg, mask, val);
2929 	if (change) {
2930 		for (wi = 0; wi < wlist->num_widgets; wi++) {
2931 			widget = wlist->widgets[wi];
2932 
2933 			widget->value = val;
2934 
2935 			update.kcontrol = kcontrol;
2936 			update.widget = widget;
2937 			update.reg = e->reg;
2938 			update.mask = mask;
2939 			update.val = val;
2940 			widget->dapm->update = &update;
2941 
2942 			soc_dapm_mux_update_power(widget, kcontrol, mux, e);
2943 
2944 			widget->dapm->update = NULL;
2945 		}
2946 	}
2947 
2948 	mutex_unlock(&card->dapm_mutex);
2949 	return change;
2950 }
2951 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_value_enum_double);
2952 
2953 /**
2954  * snd_soc_dapm_info_pin_switch - Info for a pin switch
2955  *
2956  * @kcontrol: mixer control
2957  * @uinfo: control element information
2958  *
2959  * Callback to provide information about a pin switch control.
2960  */
2961 int snd_soc_dapm_info_pin_switch(struct snd_kcontrol *kcontrol,
2962 				 struct snd_ctl_elem_info *uinfo)
2963 {
2964 	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
2965 	uinfo->count = 1;
2966 	uinfo->value.integer.min = 0;
2967 	uinfo->value.integer.max = 1;
2968 
2969 	return 0;
2970 }
2971 EXPORT_SYMBOL_GPL(snd_soc_dapm_info_pin_switch);
2972 
2973 /**
2974  * snd_soc_dapm_get_pin_switch - Get information for a pin switch
2975  *
2976  * @kcontrol: mixer control
2977  * @ucontrol: Value
2978  */
2979 int snd_soc_dapm_get_pin_switch(struct snd_kcontrol *kcontrol,
2980 				struct snd_ctl_elem_value *ucontrol)
2981 {
2982 	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
2983 	const char *pin = (const char *)kcontrol->private_value;
2984 
2985 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2986 
2987 	ucontrol->value.integer.value[0] =
2988 		snd_soc_dapm_get_pin_status(&card->dapm, pin);
2989 
2990 	mutex_unlock(&card->dapm_mutex);
2991 
2992 	return 0;
2993 }
2994 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_pin_switch);
2995 
2996 /**
2997  * snd_soc_dapm_put_pin_switch - Set information for a pin switch
2998  *
2999  * @kcontrol: mixer control
3000  * @ucontrol: Value
3001  */
3002 int snd_soc_dapm_put_pin_switch(struct snd_kcontrol *kcontrol,
3003 				struct snd_ctl_elem_value *ucontrol)
3004 {
3005 	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
3006 	const char *pin = (const char *)kcontrol->private_value;
3007 
3008 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
3009 
3010 	if (ucontrol->value.integer.value[0])
3011 		snd_soc_dapm_enable_pin(&card->dapm, pin);
3012 	else
3013 		snd_soc_dapm_disable_pin(&card->dapm, pin);
3014 
3015 	mutex_unlock(&card->dapm_mutex);
3016 
3017 	snd_soc_dapm_sync(&card->dapm);
3018 	return 0;
3019 }
3020 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_pin_switch);
3021 
3022 static struct snd_soc_dapm_widget *
3023 snd_soc_dapm_new_control(struct snd_soc_dapm_context *dapm,
3024 			 const struct snd_soc_dapm_widget *widget)
3025 {
3026 	struct snd_soc_dapm_widget *w;
3027 	size_t name_len;
3028 	int ret;
3029 
3030 	if ((w = dapm_cnew_widget(widget)) == NULL)
3031 		return NULL;
3032 
3033 	switch (w->id) {
3034 	case snd_soc_dapm_regulator_supply:
3035 		w->regulator = devm_regulator_get(dapm->dev, w->name);
3036 		if (IS_ERR(w->regulator)) {
3037 			ret = PTR_ERR(w->regulator);
3038 			dev_err(dapm->dev, "ASoC: Failed to request %s: %d\n",
3039 				w->name, ret);
3040 			return NULL;
3041 		}
3042 		break;
3043 	case snd_soc_dapm_clock_supply:
3044 #ifdef CONFIG_CLKDEV_LOOKUP
3045 		w->clk = devm_clk_get(dapm->dev, w->name);
3046 		if (IS_ERR(w->clk)) {
3047 			ret = PTR_ERR(w->clk);
3048 			dev_err(dapm->dev, "ASoC: Failed to request %s: %d\n",
3049 				w->name, ret);
3050 			return NULL;
3051 		}
3052 #else
3053 		return NULL;
3054 #endif
3055 		break;
3056 	default:
3057 		break;
3058 	}
3059 
3060 	name_len = strlen(widget->name) + 1;
3061 	if (dapm->codec && dapm->codec->name_prefix)
3062 		name_len += 1 + strlen(dapm->codec->name_prefix);
3063 	w->name = kmalloc(name_len, GFP_KERNEL);
3064 	if (w->name == NULL) {
3065 		kfree(w);
3066 		return NULL;
3067 	}
3068 	if (dapm->codec && dapm->codec->name_prefix)
3069 		snprintf((char *)w->name, name_len, "%s %s",
3070 			dapm->codec->name_prefix, widget->name);
3071 	else
3072 		snprintf((char *)w->name, name_len, "%s", widget->name);
3073 
3074 	switch (w->id) {
3075 	case snd_soc_dapm_switch:
3076 	case snd_soc_dapm_mixer:
3077 	case snd_soc_dapm_mixer_named_ctl:
3078 		w->power_check = dapm_generic_check_power;
3079 		break;
3080 	case snd_soc_dapm_mux:
3081 	case snd_soc_dapm_virt_mux:
3082 	case snd_soc_dapm_value_mux:
3083 		w->power_check = dapm_generic_check_power;
3084 		break;
3085 	case snd_soc_dapm_adc:
3086 	case snd_soc_dapm_aif_out:
3087 		w->power_check = dapm_adc_check_power;
3088 		break;
3089 	case snd_soc_dapm_dac:
3090 	case snd_soc_dapm_aif_in:
3091 		w->power_check = dapm_dac_check_power;
3092 		break;
3093 	case snd_soc_dapm_pga:
3094 	case snd_soc_dapm_out_drv:
3095 	case snd_soc_dapm_input:
3096 	case snd_soc_dapm_output:
3097 	case snd_soc_dapm_micbias:
3098 	case snd_soc_dapm_spk:
3099 	case snd_soc_dapm_hp:
3100 	case snd_soc_dapm_mic:
3101 	case snd_soc_dapm_line:
3102 	case snd_soc_dapm_dai_link:
3103 		w->power_check = dapm_generic_check_power;
3104 		break;
3105 	case snd_soc_dapm_supply:
3106 	case snd_soc_dapm_regulator_supply:
3107 	case snd_soc_dapm_clock_supply:
3108 		w->power_check = dapm_supply_check_power;
3109 		break;
3110 	case snd_soc_dapm_dai:
3111 		w->power_check = dapm_dai_check_power;
3112 		break;
3113 	default:
3114 		w->power_check = dapm_always_on_check_power;
3115 		break;
3116 	}
3117 
3118 	dapm->n_widgets++;
3119 	w->dapm = dapm;
3120 	w->codec = dapm->codec;
3121 	w->platform = dapm->platform;
3122 	INIT_LIST_HEAD(&w->sources);
3123 	INIT_LIST_HEAD(&w->sinks);
3124 	INIT_LIST_HEAD(&w->list);
3125 	INIT_LIST_HEAD(&w->dirty);
3126 	list_add(&w->list, &dapm->card->widgets);
3127 
3128 	/* machine layer set ups unconnected pins and insertions */
3129 	w->connected = 1;
3130 	return w;
3131 }
3132 
3133 /**
3134  * snd_soc_dapm_new_controls - create new dapm controls
3135  * @dapm: DAPM context
3136  * @widget: widget array
3137  * @num: number of widgets
3138  *
3139  * Creates new DAPM controls based upon the templates.
3140  *
3141  * Returns 0 for success else error.
3142  */
3143 int snd_soc_dapm_new_controls(struct snd_soc_dapm_context *dapm,
3144 	const struct snd_soc_dapm_widget *widget,
3145 	int num)
3146 {
3147 	struct snd_soc_dapm_widget *w;
3148 	int i;
3149 	int ret = 0;
3150 
3151 	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
3152 	for (i = 0; i < num; i++) {
3153 		w = snd_soc_dapm_new_control(dapm, widget);
3154 		if (!w) {
3155 			dev_err(dapm->dev,
3156 				"ASoC: Failed to create DAPM control %s\n",
3157 				widget->name);
3158 			ret = -ENOMEM;
3159 			break;
3160 		}
3161 		widget++;
3162 	}
3163 	mutex_unlock(&dapm->card->dapm_mutex);
3164 	return ret;
3165 }
3166 EXPORT_SYMBOL_GPL(snd_soc_dapm_new_controls);
3167 
3168 static int snd_soc_dai_link_event(struct snd_soc_dapm_widget *w,
3169 				  struct snd_kcontrol *kcontrol, int event)
3170 {
3171 	struct snd_soc_dapm_path *source_p, *sink_p;
3172 	struct snd_soc_dai *source, *sink;
3173 	const struct snd_soc_pcm_stream *config = w->params;
3174 	struct snd_pcm_substream substream;
3175 	struct snd_pcm_hw_params *params = NULL;
3176 	u64 fmt;
3177 	int ret;
3178 
3179 	BUG_ON(!config);
3180 	BUG_ON(list_empty(&w->sources) || list_empty(&w->sinks));
3181 
3182 	/* We only support a single source and sink, pick the first */
3183 	source_p = list_first_entry(&w->sources, struct snd_soc_dapm_path,
3184 				    list_sink);
3185 	sink_p = list_first_entry(&w->sinks, struct snd_soc_dapm_path,
3186 				  list_source);
3187 
3188 	BUG_ON(!source_p || !sink_p);
3189 	BUG_ON(!sink_p->source || !source_p->sink);
3190 	BUG_ON(!source_p->source || !sink_p->sink);
3191 
3192 	source = source_p->source->priv;
3193 	sink = sink_p->sink->priv;
3194 
3195 	/* Be a little careful as we don't want to overflow the mask array */
3196 	if (config->formats) {
3197 		fmt = ffs(config->formats) - 1;
3198 	} else {
3199 		dev_warn(w->dapm->dev, "ASoC: Invalid format %llx specified\n",
3200 			 config->formats);
3201 		fmt = 0;
3202 	}
3203 
3204 	/* Currently very limited parameter selection */
3205 	params = kzalloc(sizeof(*params), GFP_KERNEL);
3206 	if (!params) {
3207 		ret = -ENOMEM;
3208 		goto out;
3209 	}
3210 	snd_mask_set(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), fmt);
3211 
3212 	hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE)->min =
3213 		config->rate_min;
3214 	hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE)->max =
3215 		config->rate_max;
3216 
3217 	hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS)->min
3218 		= config->channels_min;
3219 	hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS)->max
3220 		= config->channels_max;
3221 
3222 	memset(&substream, 0, sizeof(substream));
3223 
3224 	switch (event) {
3225 	case SND_SOC_DAPM_PRE_PMU:
3226 		if (source->driver->ops && source->driver->ops->hw_params) {
3227 			substream.stream = SNDRV_PCM_STREAM_CAPTURE;
3228 			ret = source->driver->ops->hw_params(&substream,
3229 							     params, source);
3230 			if (ret != 0) {
3231 				dev_err(source->dev,
3232 					"ASoC: hw_params() failed: %d\n", ret);
3233 				goto out;
3234 			}
3235 		}
3236 
3237 		if (sink->driver->ops && sink->driver->ops->hw_params) {
3238 			substream.stream = SNDRV_PCM_STREAM_PLAYBACK;
3239 			ret = sink->driver->ops->hw_params(&substream, params,
3240 							   sink);
3241 			if (ret != 0) {
3242 				dev_err(sink->dev,
3243 					"ASoC: hw_params() failed: %d\n", ret);
3244 				goto out;
3245 			}
3246 		}
3247 		break;
3248 
3249 	case SND_SOC_DAPM_POST_PMU:
3250 		ret = snd_soc_dai_digital_mute(sink, 0);
3251 		if (ret != 0 && ret != -ENOTSUPP)
3252 			dev_warn(sink->dev, "ASoC: Failed to unmute: %d\n", ret);
3253 		ret = 0;
3254 		break;
3255 
3256 	case SND_SOC_DAPM_PRE_PMD:
3257 		ret = snd_soc_dai_digital_mute(sink, 1);
3258 		if (ret != 0 && ret != -ENOTSUPP)
3259 			dev_warn(sink->dev, "ASoC: Failed to mute: %d\n", ret);
3260 		ret = 0;
3261 		break;
3262 
3263 	default:
3264 		BUG();
3265 		return -EINVAL;
3266 	}
3267 
3268 out:
3269 	kfree(params);
3270 	return ret;
3271 }
3272 
3273 int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
3274 			 const struct snd_soc_pcm_stream *params,
3275 			 struct snd_soc_dapm_widget *source,
3276 			 struct snd_soc_dapm_widget *sink)
3277 {
3278 	struct snd_soc_dapm_route routes[2];
3279 	struct snd_soc_dapm_widget template;
3280 	struct snd_soc_dapm_widget *w;
3281 	size_t len;
3282 	char *link_name;
3283 
3284 	len = strlen(source->name) + strlen(sink->name) + 2;
3285 	link_name = devm_kzalloc(card->dev, len, GFP_KERNEL);
3286 	if (!link_name)
3287 		return -ENOMEM;
3288 	snprintf(link_name, len, "%s-%s", source->name, sink->name);
3289 
3290 	memset(&template, 0, sizeof(template));
3291 	template.reg = SND_SOC_NOPM;
3292 	template.id = snd_soc_dapm_dai_link;
3293 	template.name = link_name;
3294 	template.event = snd_soc_dai_link_event;
3295 	template.event_flags = SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMU |
3296 		SND_SOC_DAPM_PRE_PMD;
3297 
3298 	dev_dbg(card->dev, "ASoC: adding %s widget\n", link_name);
3299 
3300 	w = snd_soc_dapm_new_control(&card->dapm, &template);
3301 	if (!w) {
3302 		dev_err(card->dev, "ASoC: Failed to create %s widget\n",
3303 			link_name);
3304 		return -ENOMEM;
3305 	}
3306 
3307 	w->params = params;
3308 
3309 	memset(&routes, 0, sizeof(routes));
3310 
3311 	routes[0].source = source->name;
3312 	routes[0].sink = link_name;
3313 	routes[1].source = link_name;
3314 	routes[1].sink = sink->name;
3315 
3316 	return snd_soc_dapm_add_routes(&card->dapm, routes,
3317 				       ARRAY_SIZE(routes));
3318 }
3319 
3320 int snd_soc_dapm_new_dai_widgets(struct snd_soc_dapm_context *dapm,
3321 				 struct snd_soc_dai *dai)
3322 {
3323 	struct snd_soc_dapm_widget template;
3324 	struct snd_soc_dapm_widget *w;
3325 
3326 	WARN_ON(dapm->dev != dai->dev);
3327 
3328 	memset(&template, 0, sizeof(template));
3329 	template.reg = SND_SOC_NOPM;
3330 
3331 	if (dai->driver->playback.stream_name) {
3332 		template.id = snd_soc_dapm_dai;
3333 		template.name = dai->driver->playback.stream_name;
3334 		template.sname = dai->driver->playback.stream_name;
3335 
3336 		dev_dbg(dai->dev, "ASoC: adding %s widget\n",
3337 			template.name);
3338 
3339 		w = snd_soc_dapm_new_control(dapm, &template);
3340 		if (!w) {
3341 			dev_err(dapm->dev, "ASoC: Failed to create %s widget\n",
3342 				dai->driver->playback.stream_name);
3343 		}
3344 
3345 		w->priv = dai;
3346 		dai->playback_widget = w;
3347 	}
3348 
3349 	if (dai->driver->capture.stream_name) {
3350 		template.id = snd_soc_dapm_dai;
3351 		template.name = dai->driver->capture.stream_name;
3352 		template.sname = dai->driver->capture.stream_name;
3353 
3354 		dev_dbg(dai->dev, "ASoC: adding %s widget\n",
3355 			template.name);
3356 
3357 		w = snd_soc_dapm_new_control(dapm, &template);
3358 		if (!w) {
3359 			dev_err(dapm->dev, "ASoC: Failed to create %s widget\n",
3360 				dai->driver->capture.stream_name);
3361 		}
3362 
3363 		w->priv = dai;
3364 		dai->capture_widget = w;
3365 	}
3366 
3367 	return 0;
3368 }
3369 
3370 int snd_soc_dapm_link_dai_widgets(struct snd_soc_card *card)
3371 {
3372 	struct snd_soc_dapm_widget *dai_w, *w;
3373 	struct snd_soc_dai *dai;
3374 	struct snd_soc_dapm_route r;
3375 
3376 	memset(&r, 0, sizeof(r));
3377 
3378 	/* For each DAI widget... */
3379 	list_for_each_entry(dai_w, &card->widgets, list) {
3380 		if (dai_w->id != snd_soc_dapm_dai)
3381 			continue;
3382 
3383 		dai = dai_w->priv;
3384 
3385 		/* ...find all widgets with the same stream and link them */
3386 		list_for_each_entry(w, &card->widgets, list) {
3387 			if (w->dapm != dai_w->dapm)
3388 				continue;
3389 
3390 			if (w->id == snd_soc_dapm_dai)
3391 				continue;
3392 
3393 			if (!w->sname)
3394 				continue;
3395 
3396 			if (dai->driver->playback.stream_name &&
3397 			    strstr(w->sname,
3398 				   dai->driver->playback.stream_name)) {
3399 				r.source = dai->playback_widget->name;
3400 				r.sink = w->name;
3401 				dev_dbg(dai->dev, "%s -> %s\n",
3402 					 r.source, r.sink);
3403 
3404 				snd_soc_dapm_add_route(w->dapm, &r);
3405 			}
3406 
3407 			if (dai->driver->capture.stream_name &&
3408 			    strstr(w->sname,
3409 				   dai->driver->capture.stream_name)) {
3410 				r.source = w->name;
3411 				r.sink = dai->capture_widget->name;
3412 				dev_dbg(dai->dev, "%s -> %s\n",
3413 					r.source, r.sink);
3414 
3415 				snd_soc_dapm_add_route(w->dapm, &r);
3416 			}
3417 		}
3418 	}
3419 
3420 	return 0;
3421 }
3422 
3423 static void soc_dapm_stream_event(struct snd_soc_pcm_runtime *rtd, int stream,
3424 	int event)
3425 {
3426 
3427 	struct snd_soc_dapm_widget *w_cpu, *w_codec;
3428 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
3429 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
3430 
3431 	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
3432 		w_cpu = cpu_dai->playback_widget;
3433 		w_codec = codec_dai->playback_widget;
3434 	} else {
3435 		w_cpu = cpu_dai->capture_widget;
3436 		w_codec = codec_dai->capture_widget;
3437 	}
3438 
3439 	if (w_cpu) {
3440 
3441 		dapm_mark_dirty(w_cpu, "stream event");
3442 
3443 		switch (event) {
3444 		case SND_SOC_DAPM_STREAM_START:
3445 			w_cpu->active = 1;
3446 			break;
3447 		case SND_SOC_DAPM_STREAM_STOP:
3448 			w_cpu->active = 0;
3449 			break;
3450 		case SND_SOC_DAPM_STREAM_SUSPEND:
3451 		case SND_SOC_DAPM_STREAM_RESUME:
3452 		case SND_SOC_DAPM_STREAM_PAUSE_PUSH:
3453 		case SND_SOC_DAPM_STREAM_PAUSE_RELEASE:
3454 			break;
3455 		}
3456 	}
3457 
3458 	if (w_codec) {
3459 
3460 		dapm_mark_dirty(w_codec, "stream event");
3461 
3462 		switch (event) {
3463 		case SND_SOC_DAPM_STREAM_START:
3464 			w_codec->active = 1;
3465 			break;
3466 		case SND_SOC_DAPM_STREAM_STOP:
3467 			w_codec->active = 0;
3468 			break;
3469 		case SND_SOC_DAPM_STREAM_SUSPEND:
3470 		case SND_SOC_DAPM_STREAM_RESUME:
3471 		case SND_SOC_DAPM_STREAM_PAUSE_PUSH:
3472 		case SND_SOC_DAPM_STREAM_PAUSE_RELEASE:
3473 			break;
3474 		}
3475 	}
3476 
3477 	dapm_power_widgets(&rtd->card->dapm, event);
3478 }
3479 
3480 /**
3481  * snd_soc_dapm_stream_event - send a stream event to the dapm core
3482  * @rtd: PCM runtime data
3483  * @stream: stream name
3484  * @event: stream event
3485  *
3486  * Sends a stream event to the dapm core. The core then makes any
3487  * necessary widget power changes.
3488  *
3489  * Returns 0 for success else error.
3490  */
3491 void snd_soc_dapm_stream_event(struct snd_soc_pcm_runtime *rtd, int stream,
3492 			      int event)
3493 {
3494 	struct snd_soc_card *card = rtd->card;
3495 
3496 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
3497 	soc_dapm_stream_event(rtd, stream, event);
3498 	mutex_unlock(&card->dapm_mutex);
3499 }
3500 
3501 /**
3502  * snd_soc_dapm_enable_pin - enable pin.
3503  * @dapm: DAPM context
3504  * @pin: pin name
3505  *
3506  * Enables input/output pin and its parents or children widgets iff there is
3507  * a valid audio route and active audio stream.
3508  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
3509  * do any widget power switching.
3510  */
3511 int snd_soc_dapm_enable_pin(struct snd_soc_dapm_context *dapm, const char *pin)
3512 {
3513 	return snd_soc_dapm_set_pin(dapm, pin, 1);
3514 }
3515 EXPORT_SYMBOL_GPL(snd_soc_dapm_enable_pin);
3516 
3517 /**
3518  * snd_soc_dapm_force_enable_pin - force a pin to be enabled
3519  * @dapm: DAPM context
3520  * @pin: pin name
3521  *
3522  * Enables input/output pin regardless of any other state.  This is
3523  * intended for use with microphone bias supplies used in microphone
3524  * jack detection.
3525  *
3526  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
3527  * do any widget power switching.
3528  */
3529 int snd_soc_dapm_force_enable_pin(struct snd_soc_dapm_context *dapm,
3530 				  const char *pin)
3531 {
3532 	struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);
3533 
3534 	if (!w) {
3535 		dev_err(dapm->dev, "ASoC: unknown pin %s\n", pin);
3536 		return -EINVAL;
3537 	}
3538 
3539 	dev_dbg(w->dapm->dev, "ASoC: force enable pin %s\n", pin);
3540 	w->connected = 1;
3541 	w->force = 1;
3542 	dapm_mark_dirty(w, "force enable");
3543 
3544 	return 0;
3545 }
3546 EXPORT_SYMBOL_GPL(snd_soc_dapm_force_enable_pin);
3547 
3548 /**
3549  * snd_soc_dapm_disable_pin - disable pin.
3550  * @dapm: DAPM context
3551  * @pin: pin name
3552  *
3553  * Disables input/output pin and its parents or children widgets.
3554  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
3555  * do any widget power switching.
3556  */
3557 int snd_soc_dapm_disable_pin(struct snd_soc_dapm_context *dapm,
3558 			     const char *pin)
3559 {
3560 	return snd_soc_dapm_set_pin(dapm, pin, 0);
3561 }
3562 EXPORT_SYMBOL_GPL(snd_soc_dapm_disable_pin);
3563 
3564 /**
3565  * snd_soc_dapm_nc_pin - permanently disable pin.
3566  * @dapm: DAPM context
3567  * @pin: pin name
3568  *
3569  * Marks the specified pin as being not connected, disabling it along
3570  * any parent or child widgets.  At present this is identical to
3571  * snd_soc_dapm_disable_pin() but in future it will be extended to do
3572  * additional things such as disabling controls which only affect
3573  * paths through the pin.
3574  *
3575  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
3576  * do any widget power switching.
3577  */
3578 int snd_soc_dapm_nc_pin(struct snd_soc_dapm_context *dapm, const char *pin)
3579 {
3580 	return snd_soc_dapm_set_pin(dapm, pin, 0);
3581 }
3582 EXPORT_SYMBOL_GPL(snd_soc_dapm_nc_pin);
3583 
3584 /**
3585  * snd_soc_dapm_get_pin_status - get audio pin status
3586  * @dapm: DAPM context
3587  * @pin: audio signal pin endpoint (or start point)
3588  *
3589  * Get audio pin status - connected or disconnected.
3590  *
3591  * Returns 1 for connected otherwise 0.
3592  */
3593 int snd_soc_dapm_get_pin_status(struct snd_soc_dapm_context *dapm,
3594 				const char *pin)
3595 {
3596 	struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);
3597 
3598 	if (w)
3599 		return w->connected;
3600 
3601 	return 0;
3602 }
3603 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_pin_status);
3604 
3605 /**
3606  * snd_soc_dapm_ignore_suspend - ignore suspend status for DAPM endpoint
3607  * @dapm: DAPM context
3608  * @pin: audio signal pin endpoint (or start point)
3609  *
3610  * Mark the given endpoint or pin as ignoring suspend.  When the
3611  * system is disabled a path between two endpoints flagged as ignoring
3612  * suspend will not be disabled.  The path must already be enabled via
3613  * normal means at suspend time, it will not be turned on if it was not
3614  * already enabled.
3615  */
3616 int snd_soc_dapm_ignore_suspend(struct snd_soc_dapm_context *dapm,
3617 				const char *pin)
3618 {
3619 	struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, false);
3620 
3621 	if (!w) {
3622 		dev_err(dapm->dev, "ASoC: unknown pin %s\n", pin);
3623 		return -EINVAL;
3624 	}
3625 
3626 	w->ignore_suspend = 1;
3627 
3628 	return 0;
3629 }
3630 EXPORT_SYMBOL_GPL(snd_soc_dapm_ignore_suspend);
3631 
3632 static bool snd_soc_dapm_widget_in_card_paths(struct snd_soc_card *card,
3633 					      struct snd_soc_dapm_widget *w)
3634 {
3635 	struct snd_soc_dapm_path *p;
3636 
3637 	list_for_each_entry(p, &card->paths, list) {
3638 		if ((p->source == w) || (p->sink == w)) {
3639 			dev_dbg(card->dev,
3640 			    "... Path %s(id:%d dapm:%p) - %s(id:%d dapm:%p)\n",
3641 			    p->source->name, p->source->id, p->source->dapm,
3642 			    p->sink->name, p->sink->id, p->sink->dapm);
3643 
3644 			/* Connected to something other than the codec */
3645 			if (p->source->dapm != p->sink->dapm)
3646 				return true;
3647 			/*
3648 			 * Loopback connection from codec external pin to
3649 			 * codec external pin
3650 			 */
3651 			if (p->sink->id == snd_soc_dapm_input) {
3652 				switch (p->source->id) {
3653 				case snd_soc_dapm_output:
3654 				case snd_soc_dapm_micbias:
3655 					return true;
3656 				default:
3657 					break;
3658 				}
3659 			}
3660 		}
3661 	}
3662 
3663 	return false;
3664 }
3665 
3666 /**
3667  * snd_soc_dapm_auto_nc_codec_pins - call snd_soc_dapm_nc_pin for unused pins
3668  * @codec: The codec whose pins should be processed
3669  *
3670  * Automatically call snd_soc_dapm_nc_pin() for any external pins in the codec
3671  * which are unused. Pins are used if they are connected externally to the
3672  * codec, whether that be to some other device, or a loop-back connection to
3673  * the codec itself.
3674  */
3675 void snd_soc_dapm_auto_nc_codec_pins(struct snd_soc_codec *codec)
3676 {
3677 	struct snd_soc_card *card = codec->card;
3678 	struct snd_soc_dapm_context *dapm = &codec->dapm;
3679 	struct snd_soc_dapm_widget *w;
3680 
3681 	dev_dbg(codec->dev, "ASoC: Auto NC: DAPMs: card:%p codec:%p\n",
3682 		&card->dapm, &codec->dapm);
3683 
3684 	list_for_each_entry(w, &card->widgets, list) {
3685 		if (w->dapm != dapm)
3686 			continue;
3687 		switch (w->id) {
3688 		case snd_soc_dapm_input:
3689 		case snd_soc_dapm_output:
3690 		case snd_soc_dapm_micbias:
3691 			dev_dbg(codec->dev, "ASoC: Auto NC: Checking widget %s\n",
3692 				w->name);
3693 			if (!snd_soc_dapm_widget_in_card_paths(card, w)) {
3694 				dev_dbg(codec->dev,
3695 					"... Not in map; disabling\n");
3696 				snd_soc_dapm_nc_pin(dapm, w->name);
3697 			}
3698 			break;
3699 		default:
3700 			break;
3701 		}
3702 	}
3703 }
3704 
3705 /**
3706  * snd_soc_dapm_free - free dapm resources
3707  * @dapm: DAPM context
3708  *
3709  * Free all dapm widgets and resources.
3710  */
3711 void snd_soc_dapm_free(struct snd_soc_dapm_context *dapm)
3712 {
3713 	snd_soc_dapm_sys_remove(dapm->dev);
3714 	dapm_debugfs_cleanup(dapm);
3715 	dapm_free_widgets(dapm);
3716 	list_del(&dapm->list);
3717 }
3718 EXPORT_SYMBOL_GPL(snd_soc_dapm_free);
3719 
3720 static void soc_dapm_shutdown_codec(struct snd_soc_dapm_context *dapm)
3721 {
3722 	struct snd_soc_card *card = dapm->card;
3723 	struct snd_soc_dapm_widget *w;
3724 	LIST_HEAD(down_list);
3725 	int powerdown = 0;
3726 
3727 	mutex_lock(&card->dapm_mutex);
3728 
3729 	list_for_each_entry(w, &dapm->card->widgets, list) {
3730 		if (w->dapm != dapm)
3731 			continue;
3732 		if (w->power) {
3733 			dapm_seq_insert(w, &down_list, false);
3734 			w->power = 0;
3735 			powerdown = 1;
3736 		}
3737 	}
3738 
3739 	/* If there were no widgets to power down we're already in
3740 	 * standby.
3741 	 */
3742 	if (powerdown) {
3743 		if (dapm->bias_level == SND_SOC_BIAS_ON)
3744 			snd_soc_dapm_set_bias_level(dapm,
3745 						    SND_SOC_BIAS_PREPARE);
3746 		dapm_seq_run(dapm, &down_list, 0, false);
3747 		if (dapm->bias_level == SND_SOC_BIAS_PREPARE)
3748 			snd_soc_dapm_set_bias_level(dapm,
3749 						    SND_SOC_BIAS_STANDBY);
3750 	}
3751 
3752 	mutex_unlock(&card->dapm_mutex);
3753 }
3754 
3755 /*
3756  * snd_soc_dapm_shutdown - callback for system shutdown
3757  */
3758 void snd_soc_dapm_shutdown(struct snd_soc_card *card)
3759 {
3760 	struct snd_soc_codec *codec;
3761 
3762 	list_for_each_entry(codec, &card->codec_dev_list, card_list) {
3763 		soc_dapm_shutdown_codec(&codec->dapm);
3764 		if (codec->dapm.bias_level == SND_SOC_BIAS_STANDBY)
3765 			snd_soc_dapm_set_bias_level(&codec->dapm,
3766 						    SND_SOC_BIAS_OFF);
3767 	}
3768 }
3769 
3770 /* Module information */
3771 MODULE_AUTHOR("Liam Girdwood, lrg@slimlogic.co.uk");
3772 MODULE_DESCRIPTION("Dynamic Audio Power Management core for ALSA SoC");
3773 MODULE_LICENSE("GPL");
3774