xref: /openbmc/linux/sound/soc/soc-dapm.c (revision e2f1cf25)
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 static int snd_soc_dapm_add_path(struct snd_soc_dapm_context *dapm,
51 	struct snd_soc_dapm_widget *wsource, struct snd_soc_dapm_widget *wsink,
52 	const char *control,
53 	int (*connected)(struct snd_soc_dapm_widget *source,
54 			 struct snd_soc_dapm_widget *sink));
55 
56 struct snd_soc_dapm_widget *
57 snd_soc_dapm_new_control(struct snd_soc_dapm_context *dapm,
58 			 const struct snd_soc_dapm_widget *widget);
59 
60 struct snd_soc_dapm_widget *
61 snd_soc_dapm_new_control_unlocked(struct snd_soc_dapm_context *dapm,
62 			 const struct snd_soc_dapm_widget *widget);
63 
64 /* dapm power sequences - make this per codec in the future */
65 static int dapm_up_seq[] = {
66 	[snd_soc_dapm_pre] = 0,
67 	[snd_soc_dapm_regulator_supply] = 1,
68 	[snd_soc_dapm_clock_supply] = 1,
69 	[snd_soc_dapm_supply] = 2,
70 	[snd_soc_dapm_micbias] = 3,
71 	[snd_soc_dapm_dai_link] = 2,
72 	[snd_soc_dapm_dai_in] = 4,
73 	[snd_soc_dapm_dai_out] = 4,
74 	[snd_soc_dapm_aif_in] = 4,
75 	[snd_soc_dapm_aif_out] = 4,
76 	[snd_soc_dapm_mic] = 5,
77 	[snd_soc_dapm_mux] = 6,
78 	[snd_soc_dapm_demux] = 6,
79 	[snd_soc_dapm_dac] = 7,
80 	[snd_soc_dapm_switch] = 8,
81 	[snd_soc_dapm_mixer] = 8,
82 	[snd_soc_dapm_mixer_named_ctl] = 8,
83 	[snd_soc_dapm_pga] = 9,
84 	[snd_soc_dapm_adc] = 10,
85 	[snd_soc_dapm_out_drv] = 11,
86 	[snd_soc_dapm_hp] = 11,
87 	[snd_soc_dapm_spk] = 11,
88 	[snd_soc_dapm_line] = 11,
89 	[snd_soc_dapm_kcontrol] = 12,
90 	[snd_soc_dapm_post] = 13,
91 };
92 
93 static int dapm_down_seq[] = {
94 	[snd_soc_dapm_pre] = 0,
95 	[snd_soc_dapm_kcontrol] = 1,
96 	[snd_soc_dapm_adc] = 2,
97 	[snd_soc_dapm_hp] = 3,
98 	[snd_soc_dapm_spk] = 3,
99 	[snd_soc_dapm_line] = 3,
100 	[snd_soc_dapm_out_drv] = 3,
101 	[snd_soc_dapm_pga] = 4,
102 	[snd_soc_dapm_switch] = 5,
103 	[snd_soc_dapm_mixer_named_ctl] = 5,
104 	[snd_soc_dapm_mixer] = 5,
105 	[snd_soc_dapm_dac] = 6,
106 	[snd_soc_dapm_mic] = 7,
107 	[snd_soc_dapm_micbias] = 8,
108 	[snd_soc_dapm_mux] = 9,
109 	[snd_soc_dapm_demux] = 9,
110 	[snd_soc_dapm_aif_in] = 10,
111 	[snd_soc_dapm_aif_out] = 10,
112 	[snd_soc_dapm_dai_in] = 10,
113 	[snd_soc_dapm_dai_out] = 10,
114 	[snd_soc_dapm_dai_link] = 11,
115 	[snd_soc_dapm_supply] = 12,
116 	[snd_soc_dapm_clock_supply] = 13,
117 	[snd_soc_dapm_regulator_supply] = 13,
118 	[snd_soc_dapm_post] = 14,
119 };
120 
121 static void dapm_assert_locked(struct snd_soc_dapm_context *dapm)
122 {
123 	if (dapm->card && dapm->card->instantiated)
124 		lockdep_assert_held(&dapm->card->dapm_mutex);
125 }
126 
127 static void pop_wait(u32 pop_time)
128 {
129 	if (pop_time)
130 		schedule_timeout_uninterruptible(msecs_to_jiffies(pop_time));
131 }
132 
133 static void pop_dbg(struct device *dev, u32 pop_time, const char *fmt, ...)
134 {
135 	va_list args;
136 	char *buf;
137 
138 	if (!pop_time)
139 		return;
140 
141 	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
142 	if (buf == NULL)
143 		return;
144 
145 	va_start(args, fmt);
146 	vsnprintf(buf, PAGE_SIZE, fmt, args);
147 	dev_info(dev, "%s", buf);
148 	va_end(args);
149 
150 	kfree(buf);
151 }
152 
153 static bool dapm_dirty_widget(struct snd_soc_dapm_widget *w)
154 {
155 	return !list_empty(&w->dirty);
156 }
157 
158 static void dapm_mark_dirty(struct snd_soc_dapm_widget *w, const char *reason)
159 {
160 	dapm_assert_locked(w->dapm);
161 
162 	if (!dapm_dirty_widget(w)) {
163 		dev_vdbg(w->dapm->dev, "Marking %s dirty due to %s\n",
164 			 w->name, reason);
165 		list_add_tail(&w->dirty, &w->dapm->card->dapm_dirty);
166 	}
167 }
168 
169 /*
170  * dapm_widget_invalidate_input_paths() - Invalidate the cached number of input
171  *  paths
172  * @w: The widget for which to invalidate the cached number of input paths
173  *
174  * The function resets the cached number of inputs for the specified widget and
175  * all widgets that can be reached via outgoing paths from the widget.
176  *
177  * This function must be called if the number of input paths for a widget might
178  * have changed. E.g. if the source state of a widget changes or a path is added
179  * or activated with the widget as the sink.
180  */
181 static void dapm_widget_invalidate_input_paths(struct snd_soc_dapm_widget *w)
182 {
183 	struct snd_soc_dapm_widget *sink;
184 	struct snd_soc_dapm_path *p;
185 	LIST_HEAD(list);
186 
187 	dapm_assert_locked(w->dapm);
188 
189 	if (w->inputs == -1)
190 		return;
191 
192 	w->inputs = -1;
193 	list_add_tail(&w->work_list, &list);
194 
195 	list_for_each_entry(w, &list, work_list) {
196 		list_for_each_entry(p, &w->sinks, list_source) {
197 			if (p->is_supply || p->weak || !p->connect)
198 				continue;
199 			sink = p->sink;
200 			if (sink->inputs != -1) {
201 				sink->inputs = -1;
202 				list_add_tail(&sink->work_list, &list);
203 			}
204 		}
205 	}
206 }
207 
208 /*
209  * dapm_widget_invalidate_output_paths() - Invalidate the cached number of
210  *  output paths
211  * @w: The widget for which to invalidate the cached number of output paths
212  *
213  * Resets the cached number of outputs for the specified widget and all widgets
214  * that can be reached via incoming paths from the widget.
215  *
216  * This function must be called if the number of output paths for a widget might
217  * have changed. E.g. if the sink state of a widget changes or a path is added
218  * or activated with the widget as the source.
219  */
220 static void dapm_widget_invalidate_output_paths(struct snd_soc_dapm_widget *w)
221 {
222 	struct snd_soc_dapm_widget *source;
223 	struct snd_soc_dapm_path *p;
224 	LIST_HEAD(list);
225 
226 	dapm_assert_locked(w->dapm);
227 
228 	if (w->outputs == -1)
229 		return;
230 
231 	w->outputs = -1;
232 	list_add_tail(&w->work_list, &list);
233 
234 	list_for_each_entry(w, &list, work_list) {
235 		list_for_each_entry(p, &w->sources, list_sink) {
236 			if (p->is_supply || p->weak || !p->connect)
237 				continue;
238 			source = p->source;
239 			if (source->outputs != -1) {
240 				source->outputs = -1;
241 				list_add_tail(&source->work_list, &list);
242 			}
243 		}
244 	}
245 }
246 
247 /*
248  * dapm_path_invalidate() - Invalidates the cached number of inputs and outputs
249  *  for the widgets connected to a path
250  * @p: The path to invalidate
251  *
252  * Resets the cached number of inputs for the sink of the path and the cached
253  * number of outputs for the source of the path.
254  *
255  * This function must be called when a path is added, removed or the connected
256  * state changes.
257  */
258 static void dapm_path_invalidate(struct snd_soc_dapm_path *p)
259 {
260 	/*
261 	 * Weak paths or supply paths do not influence the number of input or
262 	 * output paths of their neighbors.
263 	 */
264 	if (p->weak || p->is_supply)
265 		return;
266 
267 	/*
268 	 * The number of connected endpoints is the sum of the number of
269 	 * connected endpoints of all neighbors. If a node with 0 connected
270 	 * endpoints is either connected or disconnected that sum won't change,
271 	 * so there is no need to re-check the path.
272 	 */
273 	if (p->source->inputs != 0)
274 		dapm_widget_invalidate_input_paths(p->sink);
275 	if (p->sink->outputs != 0)
276 		dapm_widget_invalidate_output_paths(p->source);
277 }
278 
279 void dapm_mark_endpoints_dirty(struct snd_soc_card *card)
280 {
281 	struct snd_soc_dapm_widget *w;
282 
283 	mutex_lock(&card->dapm_mutex);
284 
285 	list_for_each_entry(w, &card->widgets, list) {
286 		if (w->is_sink || w->is_source) {
287 			dapm_mark_dirty(w, "Rechecking endpoints");
288 			if (w->is_sink)
289 				dapm_widget_invalidate_output_paths(w);
290 			if (w->is_source)
291 				dapm_widget_invalidate_input_paths(w);
292 		}
293 	}
294 
295 	mutex_unlock(&card->dapm_mutex);
296 }
297 EXPORT_SYMBOL_GPL(dapm_mark_endpoints_dirty);
298 
299 /* create a new dapm widget */
300 static inline struct snd_soc_dapm_widget *dapm_cnew_widget(
301 	const struct snd_soc_dapm_widget *_widget)
302 {
303 	return kmemdup(_widget, sizeof(*_widget), GFP_KERNEL);
304 }
305 
306 struct dapm_kcontrol_data {
307 	unsigned int value;
308 	struct snd_soc_dapm_widget *widget;
309 	struct list_head paths;
310 	struct snd_soc_dapm_widget_list *wlist;
311 };
312 
313 static int dapm_kcontrol_data_alloc(struct snd_soc_dapm_widget *widget,
314 	struct snd_kcontrol *kcontrol)
315 {
316 	struct dapm_kcontrol_data *data;
317 	struct soc_mixer_control *mc;
318 	struct soc_enum *e;
319 	const char *name;
320 	int ret;
321 
322 	data = kzalloc(sizeof(*data), GFP_KERNEL);
323 	if (!data)
324 		return -ENOMEM;
325 
326 	INIT_LIST_HEAD(&data->paths);
327 
328 	switch (widget->id) {
329 	case snd_soc_dapm_switch:
330 	case snd_soc_dapm_mixer:
331 	case snd_soc_dapm_mixer_named_ctl:
332 		mc = (struct soc_mixer_control *)kcontrol->private_value;
333 
334 		if (mc->autodisable) {
335 			struct snd_soc_dapm_widget template;
336 
337 			name = kasprintf(GFP_KERNEL, "%s %s", kcontrol->id.name,
338 					 "Autodisable");
339 			if (!name) {
340 				ret = -ENOMEM;
341 				goto err_data;
342 			}
343 
344 			memset(&template, 0, sizeof(template));
345 			template.reg = mc->reg;
346 			template.mask = (1 << fls(mc->max)) - 1;
347 			template.shift = mc->shift;
348 			if (mc->invert)
349 				template.off_val = mc->max;
350 			else
351 				template.off_val = 0;
352 			template.on_val = template.off_val;
353 			template.id = snd_soc_dapm_kcontrol;
354 			template.name = name;
355 
356 			data->value = template.on_val;
357 
358 			data->widget =
359 				snd_soc_dapm_new_control_unlocked(widget->dapm,
360 				&template);
361 			kfree(name);
362 			if (!data->widget) {
363 				ret = -ENOMEM;
364 				goto err_data;
365 			}
366 		}
367 		break;
368 	case snd_soc_dapm_demux:
369 	case snd_soc_dapm_mux:
370 		e = (struct soc_enum *)kcontrol->private_value;
371 
372 		if (e->autodisable) {
373 			struct snd_soc_dapm_widget template;
374 
375 			name = kasprintf(GFP_KERNEL, "%s %s", kcontrol->id.name,
376 					 "Autodisable");
377 			if (!name) {
378 				ret = -ENOMEM;
379 				goto err_data;
380 			}
381 
382 			memset(&template, 0, sizeof(template));
383 			template.reg = e->reg;
384 			template.mask = e->mask << e->shift_l;
385 			template.shift = e->shift_l;
386 			template.off_val = snd_soc_enum_item_to_val(e, 0);
387 			template.on_val = template.off_val;
388 			template.id = snd_soc_dapm_kcontrol;
389 			template.name = name;
390 
391 			data->value = template.on_val;
392 
393 			data->widget = snd_soc_dapm_new_control_unlocked(
394 						widget->dapm, &template);
395 			kfree(name);
396 			if (!data->widget) {
397 				ret = -ENOMEM;
398 				goto err_data;
399 			}
400 
401 			snd_soc_dapm_add_path(widget->dapm, data->widget,
402 					      widget, NULL, NULL);
403 		}
404 		break;
405 	default:
406 		break;
407 	}
408 
409 	kcontrol->private_data = data;
410 
411 	return 0;
412 
413 err_data:
414 	kfree(data);
415 	return ret;
416 }
417 
418 static void dapm_kcontrol_free(struct snd_kcontrol *kctl)
419 {
420 	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kctl);
421 	kfree(data->wlist);
422 	kfree(data);
423 }
424 
425 static struct snd_soc_dapm_widget_list *dapm_kcontrol_get_wlist(
426 	const struct snd_kcontrol *kcontrol)
427 {
428 	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
429 
430 	return data->wlist;
431 }
432 
433 static int dapm_kcontrol_add_widget(struct snd_kcontrol *kcontrol,
434 	struct snd_soc_dapm_widget *widget)
435 {
436 	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
437 	struct snd_soc_dapm_widget_list *new_wlist;
438 	unsigned int n;
439 
440 	if (data->wlist)
441 		n = data->wlist->num_widgets + 1;
442 	else
443 		n = 1;
444 
445 	new_wlist = krealloc(data->wlist,
446 			sizeof(*new_wlist) + sizeof(widget) * n, GFP_KERNEL);
447 	if (!new_wlist)
448 		return -ENOMEM;
449 
450 	new_wlist->widgets[n - 1] = widget;
451 	new_wlist->num_widgets = n;
452 
453 	data->wlist = new_wlist;
454 
455 	return 0;
456 }
457 
458 static void dapm_kcontrol_add_path(const struct snd_kcontrol *kcontrol,
459 	struct snd_soc_dapm_path *path)
460 {
461 	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
462 
463 	list_add_tail(&path->list_kcontrol, &data->paths);
464 }
465 
466 static bool dapm_kcontrol_is_powered(const struct snd_kcontrol *kcontrol)
467 {
468 	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
469 
470 	if (!data->widget)
471 		return true;
472 
473 	return data->widget->power;
474 }
475 
476 static struct list_head *dapm_kcontrol_get_path_list(
477 	const struct snd_kcontrol *kcontrol)
478 {
479 	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
480 
481 	return &data->paths;
482 }
483 
484 #define dapm_kcontrol_for_each_path(path, kcontrol) \
485 	list_for_each_entry(path, dapm_kcontrol_get_path_list(kcontrol), \
486 		list_kcontrol)
487 
488 unsigned int dapm_kcontrol_get_value(const struct snd_kcontrol *kcontrol)
489 {
490 	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
491 
492 	return data->value;
493 }
494 EXPORT_SYMBOL_GPL(dapm_kcontrol_get_value);
495 
496 static bool dapm_kcontrol_set_value(const struct snd_kcontrol *kcontrol,
497 	unsigned int value)
498 {
499 	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
500 
501 	if (data->value == value)
502 		return false;
503 
504 	if (data->widget)
505 		data->widget->on_val = value;
506 
507 	data->value = value;
508 
509 	return true;
510 }
511 
512 /**
513  * snd_soc_dapm_kcontrol_dapm() - Returns the dapm context associated to a
514  *  kcontrol
515  * @kcontrol: The kcontrol
516  *
517  * Note: This function must only be used on kcontrols that are known to have
518  * been registered for a CODEC. Otherwise the behaviour is undefined.
519  */
520 struct snd_soc_dapm_context *snd_soc_dapm_kcontrol_dapm(
521 	struct snd_kcontrol *kcontrol)
522 {
523 	return dapm_kcontrol_get_wlist(kcontrol)->widgets[0]->dapm;
524 }
525 EXPORT_SYMBOL_GPL(snd_soc_dapm_kcontrol_dapm);
526 
527 static void dapm_reset(struct snd_soc_card *card)
528 {
529 	struct snd_soc_dapm_widget *w;
530 
531 	lockdep_assert_held(&card->dapm_mutex);
532 
533 	memset(&card->dapm_stats, 0, sizeof(card->dapm_stats));
534 
535 	list_for_each_entry(w, &card->widgets, list) {
536 		w->new_power = w->power;
537 		w->power_checked = false;
538 	}
539 }
540 
541 static const char *soc_dapm_prefix(struct snd_soc_dapm_context *dapm)
542 {
543 	if (!dapm->component)
544 		return NULL;
545 	return dapm->component->name_prefix;
546 }
547 
548 static int soc_dapm_read(struct snd_soc_dapm_context *dapm, int reg,
549 	unsigned int *value)
550 {
551 	if (!dapm->component)
552 		return -EIO;
553 	return snd_soc_component_read(dapm->component, reg, value);
554 }
555 
556 static int soc_dapm_update_bits(struct snd_soc_dapm_context *dapm,
557 	int reg, unsigned int mask, unsigned int value)
558 {
559 	if (!dapm->component)
560 		return -EIO;
561 	return snd_soc_component_update_bits(dapm->component, reg,
562 					     mask, value);
563 }
564 
565 static int soc_dapm_test_bits(struct snd_soc_dapm_context *dapm,
566 	int reg, unsigned int mask, unsigned int value)
567 {
568 	if (!dapm->component)
569 		return -EIO;
570 	return snd_soc_component_test_bits(dapm->component, reg, mask, value);
571 }
572 
573 static void soc_dapm_async_complete(struct snd_soc_dapm_context *dapm)
574 {
575 	if (dapm->component)
576 		snd_soc_component_async_complete(dapm->component);
577 }
578 
579 static struct snd_soc_dapm_widget *
580 dapm_wcache_lookup(struct snd_soc_dapm_wcache *wcache, const char *name)
581 {
582 	struct snd_soc_dapm_widget *w = wcache->widget;
583 	struct list_head *wlist;
584 	const int depth = 2;
585 	int i = 0;
586 
587 	if (w) {
588 		wlist = &w->dapm->card->widgets;
589 
590 		list_for_each_entry_from(w, wlist, list) {
591 			if (!strcmp(name, w->name))
592 				return w;
593 
594 			if (++i == depth)
595 				break;
596 		}
597 	}
598 
599 	return NULL;
600 }
601 
602 static inline void dapm_wcache_update(struct snd_soc_dapm_wcache *wcache,
603 				      struct snd_soc_dapm_widget *w)
604 {
605 	wcache->widget = w;
606 }
607 
608 /**
609  * snd_soc_dapm_force_bias_level() - Sets the DAPM bias level
610  * @dapm: The DAPM context for which to set the level
611  * @level: The level to set
612  *
613  * Forces the DAPM bias level to a specific state. It will call the bias level
614  * callback of DAPM context with the specified level. This will even happen if
615  * the context is already at the same level. Furthermore it will not go through
616  * the normal bias level sequencing, meaning any intermediate states between the
617  * current and the target state will not be entered.
618  *
619  * Note that the change in bias level is only temporary and the next time
620  * snd_soc_dapm_sync() is called the state will be set to the level as
621  * determined by the DAPM core. The function is mainly intended to be used to
622  * used during probe or resume from suspend to power up the device so
623  * initialization can be done, before the DAPM core takes over.
624  */
625 int snd_soc_dapm_force_bias_level(struct snd_soc_dapm_context *dapm,
626 	enum snd_soc_bias_level level)
627 {
628 	int ret = 0;
629 
630 	if (dapm->set_bias_level)
631 		ret = dapm->set_bias_level(dapm, level);
632 
633 	if (ret == 0)
634 		dapm->bias_level = level;
635 
636 	return ret;
637 }
638 EXPORT_SYMBOL_GPL(snd_soc_dapm_force_bias_level);
639 
640 /**
641  * snd_soc_dapm_set_bias_level - set the bias level for the system
642  * @dapm: DAPM context
643  * @level: level to configure
644  *
645  * Configure the bias (power) levels for the SoC audio device.
646  *
647  * Returns 0 for success else error.
648  */
649 static int snd_soc_dapm_set_bias_level(struct snd_soc_dapm_context *dapm,
650 				       enum snd_soc_bias_level level)
651 {
652 	struct snd_soc_card *card = dapm->card;
653 	int ret = 0;
654 
655 	trace_snd_soc_bias_level_start(card, level);
656 
657 	if (card && card->set_bias_level)
658 		ret = card->set_bias_level(card, dapm, level);
659 	if (ret != 0)
660 		goto out;
661 
662 	if (!card || dapm != &card->dapm)
663 		ret = snd_soc_dapm_force_bias_level(dapm, level);
664 
665 	if (ret != 0)
666 		goto out;
667 
668 	if (card && card->set_bias_level_post)
669 		ret = card->set_bias_level_post(card, dapm, level);
670 out:
671 	trace_snd_soc_bias_level_done(card, level);
672 
673 	return ret;
674 }
675 
676 /* connect mux widget to its interconnecting audio paths */
677 static int dapm_connect_mux(struct snd_soc_dapm_context *dapm,
678 	struct snd_soc_dapm_path *path, const char *control_name,
679 	struct snd_soc_dapm_widget *w)
680 {
681 	const struct snd_kcontrol_new *kcontrol = &w->kcontrol_news[0];
682 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
683 	unsigned int val, item;
684 	int i;
685 
686 	if (e->reg != SND_SOC_NOPM) {
687 		soc_dapm_read(dapm, e->reg, &val);
688 		val = (val >> e->shift_l) & e->mask;
689 		item = snd_soc_enum_val_to_item(e, val);
690 	} else {
691 		/* since a virtual mux has no backing registers to
692 		 * decide which path to connect, it will try to match
693 		 * with the first enumeration.  This is to ensure
694 		 * that the default mux choice (the first) will be
695 		 * correctly powered up during initialization.
696 		 */
697 		item = 0;
698 	}
699 
700 	for (i = 0; i < e->items; i++) {
701 		if (!(strcmp(control_name, e->texts[i]))) {
702 			path->name = e->texts[i];
703 			if (i == item)
704 				path->connect = 1;
705 			else
706 				path->connect = 0;
707 			return 0;
708 		}
709 	}
710 
711 	return -ENODEV;
712 }
713 
714 /* set up initial codec paths */
715 static void dapm_set_mixer_path_status(struct snd_soc_dapm_path *p, int i)
716 {
717 	struct soc_mixer_control *mc = (struct soc_mixer_control *)
718 		p->sink->kcontrol_news[i].private_value;
719 	unsigned int reg = mc->reg;
720 	unsigned int shift = mc->shift;
721 	unsigned int max = mc->max;
722 	unsigned int mask = (1 << fls(max)) - 1;
723 	unsigned int invert = mc->invert;
724 	unsigned int val;
725 
726 	if (reg != SND_SOC_NOPM) {
727 		soc_dapm_read(p->sink->dapm, reg, &val);
728 		val = (val >> shift) & mask;
729 		if (invert)
730 			val = max - val;
731 		p->connect = !!val;
732 	} else {
733 		p->connect = 0;
734 	}
735 }
736 
737 /* connect mixer widget to its interconnecting audio paths */
738 static int dapm_connect_mixer(struct snd_soc_dapm_context *dapm,
739 	struct snd_soc_dapm_path *path, const char *control_name)
740 {
741 	int i;
742 
743 	/* search for mixer kcontrol */
744 	for (i = 0; i < path->sink->num_kcontrols; i++) {
745 		if (!strcmp(control_name, path->sink->kcontrol_news[i].name)) {
746 			path->name = path->sink->kcontrol_news[i].name;
747 			dapm_set_mixer_path_status(path, i);
748 			return 0;
749 		}
750 	}
751 	return -ENODEV;
752 }
753 
754 static int dapm_is_shared_kcontrol(struct snd_soc_dapm_context *dapm,
755 	struct snd_soc_dapm_widget *kcontrolw,
756 	const struct snd_kcontrol_new *kcontrol_new,
757 	struct snd_kcontrol **kcontrol)
758 {
759 	struct snd_soc_dapm_widget *w;
760 	int i;
761 
762 	*kcontrol = NULL;
763 
764 	list_for_each_entry(w, &dapm->card->widgets, list) {
765 		if (w == kcontrolw || w->dapm != kcontrolw->dapm)
766 			continue;
767 		for (i = 0; i < w->num_kcontrols; i++) {
768 			if (&w->kcontrol_news[i] == kcontrol_new) {
769 				if (w->kcontrols)
770 					*kcontrol = w->kcontrols[i];
771 				return 1;
772 			}
773 		}
774 	}
775 
776 	return 0;
777 }
778 
779 /*
780  * Determine if a kcontrol is shared. If it is, look it up. If it isn't,
781  * create it. Either way, add the widget into the control's widget list
782  */
783 static int dapm_create_or_share_mixmux_kcontrol(struct snd_soc_dapm_widget *w,
784 	int kci)
785 {
786 	struct snd_soc_dapm_context *dapm = w->dapm;
787 	struct snd_card *card = dapm->card->snd_card;
788 	const char *prefix;
789 	size_t prefix_len;
790 	int shared;
791 	struct snd_kcontrol *kcontrol;
792 	bool wname_in_long_name, kcname_in_long_name;
793 	char *long_name = NULL;
794 	const char *name;
795 	int ret = 0;
796 
797 	prefix = soc_dapm_prefix(dapm);
798 	if (prefix)
799 		prefix_len = strlen(prefix) + 1;
800 	else
801 		prefix_len = 0;
802 
803 	shared = dapm_is_shared_kcontrol(dapm, w, &w->kcontrol_news[kci],
804 					 &kcontrol);
805 
806 	if (!kcontrol) {
807 		if (shared) {
808 			wname_in_long_name = false;
809 			kcname_in_long_name = true;
810 		} else {
811 			switch (w->id) {
812 			case snd_soc_dapm_switch:
813 			case snd_soc_dapm_mixer:
814 				wname_in_long_name = true;
815 				kcname_in_long_name = true;
816 				break;
817 			case snd_soc_dapm_mixer_named_ctl:
818 				wname_in_long_name = false;
819 				kcname_in_long_name = true;
820 				break;
821 			case snd_soc_dapm_demux:
822 			case snd_soc_dapm_mux:
823 				wname_in_long_name = true;
824 				kcname_in_long_name = false;
825 				break;
826 			default:
827 				return -EINVAL;
828 			}
829 		}
830 
831 		if (wname_in_long_name && kcname_in_long_name) {
832 			/*
833 			 * The control will get a prefix from the control
834 			 * creation process but we're also using the same
835 			 * prefix for widgets so cut the prefix off the
836 			 * front of the widget name.
837 			 */
838 			long_name = kasprintf(GFP_KERNEL, "%s %s",
839 				 w->name + prefix_len,
840 				 w->kcontrol_news[kci].name);
841 			if (long_name == NULL)
842 				return -ENOMEM;
843 
844 			name = long_name;
845 		} else if (wname_in_long_name) {
846 			long_name = NULL;
847 			name = w->name + prefix_len;
848 		} else {
849 			long_name = NULL;
850 			name = w->kcontrol_news[kci].name;
851 		}
852 
853 		kcontrol = snd_soc_cnew(&w->kcontrol_news[kci], NULL, name,
854 					prefix);
855 		if (!kcontrol) {
856 			ret = -ENOMEM;
857 			goto exit_free;
858 		}
859 
860 		kcontrol->private_free = dapm_kcontrol_free;
861 
862 		ret = dapm_kcontrol_data_alloc(w, kcontrol);
863 		if (ret) {
864 			snd_ctl_free_one(kcontrol);
865 			goto exit_free;
866 		}
867 
868 		ret = snd_ctl_add(card, kcontrol);
869 		if (ret < 0) {
870 			dev_err(dapm->dev,
871 				"ASoC: failed to add widget %s dapm kcontrol %s: %d\n",
872 				w->name, name, ret);
873 			goto exit_free;
874 		}
875 	}
876 
877 	ret = dapm_kcontrol_add_widget(kcontrol, w);
878 	if (ret == 0)
879 		w->kcontrols[kci] = kcontrol;
880 
881 exit_free:
882 	kfree(long_name);
883 
884 	return ret;
885 }
886 
887 /* create new dapm mixer control */
888 static int dapm_new_mixer(struct snd_soc_dapm_widget *w)
889 {
890 	int i, ret;
891 	struct snd_soc_dapm_path *path;
892 	struct dapm_kcontrol_data *data;
893 
894 	/* add kcontrol */
895 	for (i = 0; i < w->num_kcontrols; i++) {
896 		/* match name */
897 		list_for_each_entry(path, &w->sources, list_sink) {
898 			/* mixer/mux paths name must match control name */
899 			if (path->name != (char *)w->kcontrol_news[i].name)
900 				continue;
901 
902 			if (!w->kcontrols[i]) {
903 				ret = dapm_create_or_share_mixmux_kcontrol(w, i);
904 				if (ret < 0)
905 					return ret;
906 			}
907 
908 			dapm_kcontrol_add_path(w->kcontrols[i], path);
909 
910 			data = snd_kcontrol_chip(w->kcontrols[i]);
911 			if (data->widget)
912 				snd_soc_dapm_add_path(data->widget->dapm,
913 						      data->widget,
914 						      path->source,
915 						      NULL, NULL);
916 		}
917 	}
918 
919 	return 0;
920 }
921 
922 /* create new dapm mux control */
923 static int dapm_new_mux(struct snd_soc_dapm_widget *w)
924 {
925 	struct snd_soc_dapm_context *dapm = w->dapm;
926 	struct snd_soc_dapm_path *path;
927 	struct list_head *paths;
928 	const char *type;
929 	int ret;
930 
931 	switch (w->id) {
932 	case snd_soc_dapm_mux:
933 		paths = &w->sources;
934 		type = "mux";
935 		break;
936 	case snd_soc_dapm_demux:
937 		paths = &w->sinks;
938 		type = "demux";
939 		break;
940 	default:
941 		return -EINVAL;
942 	}
943 
944 	if (w->num_kcontrols != 1) {
945 		dev_err(dapm->dev,
946 			"ASoC: %s %s has incorrect number of controls\n", type,
947 			w->name);
948 		return -EINVAL;
949 	}
950 
951 	if (list_empty(paths)) {
952 		dev_err(dapm->dev, "ASoC: %s %s has no paths\n", type, w->name);
953 		return -EINVAL;
954 	}
955 
956 	ret = dapm_create_or_share_mixmux_kcontrol(w, 0);
957 	if (ret < 0)
958 		return ret;
959 
960 	if (w->id == snd_soc_dapm_mux) {
961 		list_for_each_entry(path, &w->sources, list_sink) {
962 			if (path->name)
963 				dapm_kcontrol_add_path(w->kcontrols[0], path);
964 		}
965 	} else {
966 		list_for_each_entry(path, &w->sinks, list_source) {
967 			if (path->name)
968 				dapm_kcontrol_add_path(w->kcontrols[0], path);
969 		}
970 	}
971 
972 	return 0;
973 }
974 
975 /* create new dapm volume control */
976 static int dapm_new_pga(struct snd_soc_dapm_widget *w)
977 {
978 	if (w->num_kcontrols)
979 		dev_err(w->dapm->dev,
980 			"ASoC: PGA controls not supported: '%s'\n", w->name);
981 
982 	return 0;
983 }
984 
985 /* create new dapm dai link control */
986 static int dapm_new_dai_link(struct snd_soc_dapm_widget *w)
987 {
988 	int i, ret;
989 	struct snd_kcontrol *kcontrol;
990 	struct snd_soc_dapm_context *dapm = w->dapm;
991 	struct snd_card *card = dapm->card->snd_card;
992 
993 	/* create control for links with > 1 config */
994 	if (w->num_params <= 1)
995 		return 0;
996 
997 	/* add kcontrol */
998 	for (i = 0; i < w->num_kcontrols; i++) {
999 		kcontrol = snd_soc_cnew(&w->kcontrol_news[i], w,
1000 					w->name, NULL);
1001 		ret = snd_ctl_add(card, kcontrol);
1002 		if (ret < 0) {
1003 			dev_err(dapm->dev,
1004 				"ASoC: failed to add widget %s dapm kcontrol %s: %d\n",
1005 				w->name, w->kcontrol_news[i].name, ret);
1006 			return ret;
1007 		}
1008 		kcontrol->private_data = w;
1009 		w->kcontrols[i] = kcontrol;
1010 	}
1011 
1012 	return 0;
1013 }
1014 
1015 /* We implement power down on suspend by checking the power state of
1016  * the ALSA card - when we are suspending the ALSA state for the card
1017  * is set to D3.
1018  */
1019 static int snd_soc_dapm_suspend_check(struct snd_soc_dapm_widget *widget)
1020 {
1021 	int level = snd_power_get_state(widget->dapm->card->snd_card);
1022 
1023 	switch (level) {
1024 	case SNDRV_CTL_POWER_D3hot:
1025 	case SNDRV_CTL_POWER_D3cold:
1026 		if (widget->ignore_suspend)
1027 			dev_dbg(widget->dapm->dev, "ASoC: %s ignoring suspend\n",
1028 				widget->name);
1029 		return widget->ignore_suspend;
1030 	default:
1031 		return 1;
1032 	}
1033 }
1034 
1035 /* add widget to list if it's not already in the list */
1036 static int dapm_list_add_widget(struct snd_soc_dapm_widget_list **list,
1037 	struct snd_soc_dapm_widget *w)
1038 {
1039 	struct snd_soc_dapm_widget_list *wlist;
1040 	int wlistsize, wlistentries, i;
1041 
1042 	if (*list == NULL)
1043 		return -EINVAL;
1044 
1045 	wlist = *list;
1046 
1047 	/* is this widget already in the list */
1048 	for (i = 0; i < wlist->num_widgets; i++) {
1049 		if (wlist->widgets[i] == w)
1050 			return 0;
1051 	}
1052 
1053 	/* allocate some new space */
1054 	wlistentries = wlist->num_widgets + 1;
1055 	wlistsize = sizeof(struct snd_soc_dapm_widget_list) +
1056 			wlistentries * sizeof(struct snd_soc_dapm_widget *);
1057 	*list = krealloc(wlist, wlistsize, GFP_KERNEL);
1058 	if (*list == NULL) {
1059 		dev_err(w->dapm->dev, "ASoC: can't allocate widget list for %s\n",
1060 			w->name);
1061 		return -ENOMEM;
1062 	}
1063 	wlist = *list;
1064 
1065 	/* insert the widget */
1066 	dev_dbg(w->dapm->dev, "ASoC: added %s in widget list pos %d\n",
1067 			w->name, wlist->num_widgets);
1068 
1069 	wlist->widgets[wlist->num_widgets] = w;
1070 	wlist->num_widgets++;
1071 	return 1;
1072 }
1073 
1074 /*
1075  * Recursively check for a completed path to an active or physically connected
1076  * output widget. Returns number of complete paths.
1077  */
1078 static int is_connected_output_ep(struct snd_soc_dapm_widget *widget,
1079 	struct snd_soc_dapm_widget_list **list)
1080 {
1081 	struct snd_soc_dapm_path *path;
1082 	int con = 0;
1083 
1084 	if (widget->outputs >= 0)
1085 		return widget->outputs;
1086 
1087 	DAPM_UPDATE_STAT(widget, path_checks);
1088 
1089 	if (widget->is_sink && widget->connected) {
1090 		widget->outputs = snd_soc_dapm_suspend_check(widget);
1091 		return widget->outputs;
1092 	}
1093 
1094 	list_for_each_entry(path, &widget->sinks, list_source) {
1095 		DAPM_UPDATE_STAT(widget, neighbour_checks);
1096 
1097 		if (path->weak || path->is_supply)
1098 			continue;
1099 
1100 		if (path->walking)
1101 			return 1;
1102 
1103 		trace_snd_soc_dapm_output_path(widget, path);
1104 
1105 		if (path->connect) {
1106 			path->walking = 1;
1107 
1108 			/* do we need to add this widget to the list ? */
1109 			if (list) {
1110 				int err;
1111 				err = dapm_list_add_widget(list, path->sink);
1112 				if (err < 0) {
1113 					dev_err(widget->dapm->dev,
1114 						"ASoC: could not add widget %s\n",
1115 						widget->name);
1116 					path->walking = 0;
1117 					return con;
1118 				}
1119 			}
1120 
1121 			con += is_connected_output_ep(path->sink, list);
1122 
1123 			path->walking = 0;
1124 		}
1125 	}
1126 
1127 	widget->outputs = con;
1128 
1129 	return con;
1130 }
1131 
1132 /*
1133  * Recursively check for a completed path to an active or physically connected
1134  * input widget. Returns number of complete paths.
1135  */
1136 static int is_connected_input_ep(struct snd_soc_dapm_widget *widget,
1137 	struct snd_soc_dapm_widget_list **list)
1138 {
1139 	struct snd_soc_dapm_path *path;
1140 	int con = 0;
1141 
1142 	if (widget->inputs >= 0)
1143 		return widget->inputs;
1144 
1145 	DAPM_UPDATE_STAT(widget, path_checks);
1146 
1147 	if (widget->is_source && widget->connected) {
1148 		widget->inputs = snd_soc_dapm_suspend_check(widget);
1149 		return widget->inputs;
1150 	}
1151 
1152 	list_for_each_entry(path, &widget->sources, list_sink) {
1153 		DAPM_UPDATE_STAT(widget, neighbour_checks);
1154 
1155 		if (path->weak || path->is_supply)
1156 			continue;
1157 
1158 		if (path->walking)
1159 			return 1;
1160 
1161 		trace_snd_soc_dapm_input_path(widget, path);
1162 
1163 		if (path->connect) {
1164 			path->walking = 1;
1165 
1166 			/* do we need to add this widget to the list ? */
1167 			if (list) {
1168 				int err;
1169 				err = dapm_list_add_widget(list, path->source);
1170 				if (err < 0) {
1171 					dev_err(widget->dapm->dev,
1172 						"ASoC: could not add widget %s\n",
1173 						widget->name);
1174 					path->walking = 0;
1175 					return con;
1176 				}
1177 			}
1178 
1179 			con += is_connected_input_ep(path->source, list);
1180 
1181 			path->walking = 0;
1182 		}
1183 	}
1184 
1185 	widget->inputs = con;
1186 
1187 	return con;
1188 }
1189 
1190 /**
1191  * snd_soc_dapm_get_connected_widgets - query audio path and it's widgets.
1192  * @dai: the soc DAI.
1193  * @stream: stream direction.
1194  * @list: list of active widgets for this stream.
1195  *
1196  * Queries DAPM graph as to whether an valid audio stream path exists for
1197  * the initial stream specified by name. This takes into account
1198  * current mixer and mux kcontrol settings. Creates list of valid widgets.
1199  *
1200  * Returns the number of valid paths or negative error.
1201  */
1202 int snd_soc_dapm_dai_get_connected_widgets(struct snd_soc_dai *dai, int stream,
1203 	struct snd_soc_dapm_widget_list **list)
1204 {
1205 	struct snd_soc_card *card = dai->component->card;
1206 	struct snd_soc_dapm_widget *w;
1207 	int paths;
1208 
1209 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
1210 
1211 	/*
1212 	 * For is_connected_{output,input}_ep fully discover the graph we need
1213 	 * to reset the cached number of inputs and outputs.
1214 	 */
1215 	list_for_each_entry(w, &card->widgets, list) {
1216 		w->inputs = -1;
1217 		w->outputs = -1;
1218 	}
1219 
1220 	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
1221 		paths = is_connected_output_ep(dai->playback_widget, list);
1222 	else
1223 		paths = is_connected_input_ep(dai->capture_widget, list);
1224 
1225 	trace_snd_soc_dapm_connected(paths, stream);
1226 	mutex_unlock(&card->dapm_mutex);
1227 
1228 	return paths;
1229 }
1230 
1231 /*
1232  * Handler for regulator supply widget.
1233  */
1234 int dapm_regulator_event(struct snd_soc_dapm_widget *w,
1235 		   struct snd_kcontrol *kcontrol, int event)
1236 {
1237 	int ret;
1238 
1239 	soc_dapm_async_complete(w->dapm);
1240 
1241 	if (SND_SOC_DAPM_EVENT_ON(event)) {
1242 		if (w->on_val & SND_SOC_DAPM_REGULATOR_BYPASS) {
1243 			ret = regulator_allow_bypass(w->regulator, false);
1244 			if (ret != 0)
1245 				dev_warn(w->dapm->dev,
1246 					 "ASoC: Failed to unbypass %s: %d\n",
1247 					 w->name, ret);
1248 		}
1249 
1250 		return regulator_enable(w->regulator);
1251 	} else {
1252 		if (w->on_val & SND_SOC_DAPM_REGULATOR_BYPASS) {
1253 			ret = regulator_allow_bypass(w->regulator, true);
1254 			if (ret != 0)
1255 				dev_warn(w->dapm->dev,
1256 					 "ASoC: Failed to bypass %s: %d\n",
1257 					 w->name, ret);
1258 		}
1259 
1260 		return regulator_disable_deferred(w->regulator, w->shift);
1261 	}
1262 }
1263 EXPORT_SYMBOL_GPL(dapm_regulator_event);
1264 
1265 /*
1266  * Handler for clock supply widget.
1267  */
1268 int dapm_clock_event(struct snd_soc_dapm_widget *w,
1269 		   struct snd_kcontrol *kcontrol, int event)
1270 {
1271 	if (!w->clk)
1272 		return -EIO;
1273 
1274 	soc_dapm_async_complete(w->dapm);
1275 
1276 #ifdef CONFIG_HAVE_CLK
1277 	if (SND_SOC_DAPM_EVENT_ON(event)) {
1278 		return clk_prepare_enable(w->clk);
1279 	} else {
1280 		clk_disable_unprepare(w->clk);
1281 		return 0;
1282 	}
1283 #endif
1284 	return 0;
1285 }
1286 EXPORT_SYMBOL_GPL(dapm_clock_event);
1287 
1288 static int dapm_widget_power_check(struct snd_soc_dapm_widget *w)
1289 {
1290 	if (w->power_checked)
1291 		return w->new_power;
1292 
1293 	if (w->force)
1294 		w->new_power = 1;
1295 	else
1296 		w->new_power = w->power_check(w);
1297 
1298 	w->power_checked = true;
1299 
1300 	return w->new_power;
1301 }
1302 
1303 /* Generic check to see if a widget should be powered.
1304  */
1305 static int dapm_generic_check_power(struct snd_soc_dapm_widget *w)
1306 {
1307 	int in, out;
1308 
1309 	DAPM_UPDATE_STAT(w, power_checks);
1310 
1311 	in = is_connected_input_ep(w, NULL);
1312 	out = is_connected_output_ep(w, NULL);
1313 	return out != 0 && in != 0;
1314 }
1315 
1316 /* Check to see if a power supply is needed */
1317 static int dapm_supply_check_power(struct snd_soc_dapm_widget *w)
1318 {
1319 	struct snd_soc_dapm_path *path;
1320 
1321 	DAPM_UPDATE_STAT(w, power_checks);
1322 
1323 	/* Check if one of our outputs is connected */
1324 	list_for_each_entry(path, &w->sinks, list_source) {
1325 		DAPM_UPDATE_STAT(w, neighbour_checks);
1326 
1327 		if (path->weak)
1328 			continue;
1329 
1330 		if (path->connected &&
1331 		    !path->connected(path->source, path->sink))
1332 			continue;
1333 
1334 		if (dapm_widget_power_check(path->sink))
1335 			return 1;
1336 	}
1337 
1338 	return 0;
1339 }
1340 
1341 static int dapm_always_on_check_power(struct snd_soc_dapm_widget *w)
1342 {
1343 	return 1;
1344 }
1345 
1346 static int dapm_seq_compare(struct snd_soc_dapm_widget *a,
1347 			    struct snd_soc_dapm_widget *b,
1348 			    bool power_up)
1349 {
1350 	int *sort;
1351 
1352 	if (power_up)
1353 		sort = dapm_up_seq;
1354 	else
1355 		sort = dapm_down_seq;
1356 
1357 	if (sort[a->id] != sort[b->id])
1358 		return sort[a->id] - sort[b->id];
1359 	if (a->subseq != b->subseq) {
1360 		if (power_up)
1361 			return a->subseq - b->subseq;
1362 		else
1363 			return b->subseq - a->subseq;
1364 	}
1365 	if (a->reg != b->reg)
1366 		return a->reg - b->reg;
1367 	if (a->dapm != b->dapm)
1368 		return (unsigned long)a->dapm - (unsigned long)b->dapm;
1369 
1370 	return 0;
1371 }
1372 
1373 /* Insert a widget in order into a DAPM power sequence. */
1374 static void dapm_seq_insert(struct snd_soc_dapm_widget *new_widget,
1375 			    struct list_head *list,
1376 			    bool power_up)
1377 {
1378 	struct snd_soc_dapm_widget *w;
1379 
1380 	list_for_each_entry(w, list, power_list)
1381 		if (dapm_seq_compare(new_widget, w, power_up) < 0) {
1382 			list_add_tail(&new_widget->power_list, &w->power_list);
1383 			return;
1384 		}
1385 
1386 	list_add_tail(&new_widget->power_list, list);
1387 }
1388 
1389 static void dapm_seq_check_event(struct snd_soc_card *card,
1390 				 struct snd_soc_dapm_widget *w, int event)
1391 {
1392 	const char *ev_name;
1393 	int power, ret;
1394 
1395 	switch (event) {
1396 	case SND_SOC_DAPM_PRE_PMU:
1397 		ev_name = "PRE_PMU";
1398 		power = 1;
1399 		break;
1400 	case SND_SOC_DAPM_POST_PMU:
1401 		ev_name = "POST_PMU";
1402 		power = 1;
1403 		break;
1404 	case SND_SOC_DAPM_PRE_PMD:
1405 		ev_name = "PRE_PMD";
1406 		power = 0;
1407 		break;
1408 	case SND_SOC_DAPM_POST_PMD:
1409 		ev_name = "POST_PMD";
1410 		power = 0;
1411 		break;
1412 	case SND_SOC_DAPM_WILL_PMU:
1413 		ev_name = "WILL_PMU";
1414 		power = 1;
1415 		break;
1416 	case SND_SOC_DAPM_WILL_PMD:
1417 		ev_name = "WILL_PMD";
1418 		power = 0;
1419 		break;
1420 	default:
1421 		WARN(1, "Unknown event %d\n", event);
1422 		return;
1423 	}
1424 
1425 	if (w->new_power != power)
1426 		return;
1427 
1428 	if (w->event && (w->event_flags & event)) {
1429 		pop_dbg(w->dapm->dev, card->pop_time, "pop test : %s %s\n",
1430 			w->name, ev_name);
1431 		soc_dapm_async_complete(w->dapm);
1432 		trace_snd_soc_dapm_widget_event_start(w, event);
1433 		ret = w->event(w, NULL, event);
1434 		trace_snd_soc_dapm_widget_event_done(w, event);
1435 		if (ret < 0)
1436 			dev_err(w->dapm->dev, "ASoC: %s: %s event failed: %d\n",
1437 			       ev_name, w->name, ret);
1438 	}
1439 }
1440 
1441 /* Apply the coalesced changes from a DAPM sequence */
1442 static void dapm_seq_run_coalesced(struct snd_soc_card *card,
1443 				   struct list_head *pending)
1444 {
1445 	struct snd_soc_dapm_context *dapm;
1446 	struct snd_soc_dapm_widget *w;
1447 	int reg;
1448 	unsigned int value = 0;
1449 	unsigned int mask = 0;
1450 
1451 	w = list_first_entry(pending, struct snd_soc_dapm_widget, power_list);
1452 	reg = w->reg;
1453 	dapm = w->dapm;
1454 
1455 	list_for_each_entry(w, pending, power_list) {
1456 		WARN_ON(reg != w->reg || dapm != w->dapm);
1457 		w->power = w->new_power;
1458 
1459 		mask |= w->mask << w->shift;
1460 		if (w->power)
1461 			value |= w->on_val << w->shift;
1462 		else
1463 			value |= w->off_val << w->shift;
1464 
1465 		pop_dbg(dapm->dev, card->pop_time,
1466 			"pop test : Queue %s: reg=0x%x, 0x%x/0x%x\n",
1467 			w->name, reg, value, mask);
1468 
1469 		/* Check for events */
1470 		dapm_seq_check_event(card, w, SND_SOC_DAPM_PRE_PMU);
1471 		dapm_seq_check_event(card, w, SND_SOC_DAPM_PRE_PMD);
1472 	}
1473 
1474 	if (reg >= 0) {
1475 		/* Any widget will do, they should all be updating the
1476 		 * same register.
1477 		 */
1478 
1479 		pop_dbg(dapm->dev, card->pop_time,
1480 			"pop test : Applying 0x%x/0x%x to %x in %dms\n",
1481 			value, mask, reg, card->pop_time);
1482 		pop_wait(card->pop_time);
1483 		soc_dapm_update_bits(dapm, reg, mask, value);
1484 	}
1485 
1486 	list_for_each_entry(w, pending, power_list) {
1487 		dapm_seq_check_event(card, w, SND_SOC_DAPM_POST_PMU);
1488 		dapm_seq_check_event(card, w, SND_SOC_DAPM_POST_PMD);
1489 	}
1490 }
1491 
1492 /* Apply a DAPM power sequence.
1493  *
1494  * We walk over a pre-sorted list of widgets to apply power to.  In
1495  * order to minimise the number of writes to the device required
1496  * multiple widgets will be updated in a single write where possible.
1497  * Currently anything that requires more than a single write is not
1498  * handled.
1499  */
1500 static void dapm_seq_run(struct snd_soc_card *card,
1501 	struct list_head *list, int event, bool power_up)
1502 {
1503 	struct snd_soc_dapm_widget *w, *n;
1504 	struct snd_soc_dapm_context *d;
1505 	LIST_HEAD(pending);
1506 	int cur_sort = -1;
1507 	int cur_subseq = -1;
1508 	int cur_reg = SND_SOC_NOPM;
1509 	struct snd_soc_dapm_context *cur_dapm = NULL;
1510 	int ret, i;
1511 	int *sort;
1512 
1513 	if (power_up)
1514 		sort = dapm_up_seq;
1515 	else
1516 		sort = dapm_down_seq;
1517 
1518 	list_for_each_entry_safe(w, n, list, power_list) {
1519 		ret = 0;
1520 
1521 		/* Do we need to apply any queued changes? */
1522 		if (sort[w->id] != cur_sort || w->reg != cur_reg ||
1523 		    w->dapm != cur_dapm || w->subseq != cur_subseq) {
1524 			if (!list_empty(&pending))
1525 				dapm_seq_run_coalesced(card, &pending);
1526 
1527 			if (cur_dapm && cur_dapm->seq_notifier) {
1528 				for (i = 0; i < ARRAY_SIZE(dapm_up_seq); i++)
1529 					if (sort[i] == cur_sort)
1530 						cur_dapm->seq_notifier(cur_dapm,
1531 								       i,
1532 								       cur_subseq);
1533 			}
1534 
1535 			if (cur_dapm && w->dapm != cur_dapm)
1536 				soc_dapm_async_complete(cur_dapm);
1537 
1538 			INIT_LIST_HEAD(&pending);
1539 			cur_sort = -1;
1540 			cur_subseq = INT_MIN;
1541 			cur_reg = SND_SOC_NOPM;
1542 			cur_dapm = NULL;
1543 		}
1544 
1545 		switch (w->id) {
1546 		case snd_soc_dapm_pre:
1547 			if (!w->event)
1548 				list_for_each_entry_safe_continue(w, n, list,
1549 								  power_list);
1550 
1551 			if (event == SND_SOC_DAPM_STREAM_START)
1552 				ret = w->event(w,
1553 					       NULL, SND_SOC_DAPM_PRE_PMU);
1554 			else if (event == SND_SOC_DAPM_STREAM_STOP)
1555 				ret = w->event(w,
1556 					       NULL, SND_SOC_DAPM_PRE_PMD);
1557 			break;
1558 
1559 		case snd_soc_dapm_post:
1560 			if (!w->event)
1561 				list_for_each_entry_safe_continue(w, n, list,
1562 								  power_list);
1563 
1564 			if (event == SND_SOC_DAPM_STREAM_START)
1565 				ret = w->event(w,
1566 					       NULL, SND_SOC_DAPM_POST_PMU);
1567 			else if (event == SND_SOC_DAPM_STREAM_STOP)
1568 				ret = w->event(w,
1569 					       NULL, SND_SOC_DAPM_POST_PMD);
1570 			break;
1571 
1572 		default:
1573 			/* Queue it up for application */
1574 			cur_sort = sort[w->id];
1575 			cur_subseq = w->subseq;
1576 			cur_reg = w->reg;
1577 			cur_dapm = w->dapm;
1578 			list_move(&w->power_list, &pending);
1579 			break;
1580 		}
1581 
1582 		if (ret < 0)
1583 			dev_err(w->dapm->dev,
1584 				"ASoC: Failed to apply widget power: %d\n", ret);
1585 	}
1586 
1587 	if (!list_empty(&pending))
1588 		dapm_seq_run_coalesced(card, &pending);
1589 
1590 	if (cur_dapm && cur_dapm->seq_notifier) {
1591 		for (i = 0; i < ARRAY_SIZE(dapm_up_seq); i++)
1592 			if (sort[i] == cur_sort)
1593 				cur_dapm->seq_notifier(cur_dapm,
1594 						       i, cur_subseq);
1595 	}
1596 
1597 	list_for_each_entry(d, &card->dapm_list, list) {
1598 		soc_dapm_async_complete(d);
1599 	}
1600 }
1601 
1602 static void dapm_widget_update(struct snd_soc_card *card)
1603 {
1604 	struct snd_soc_dapm_update *update = card->update;
1605 	struct snd_soc_dapm_widget_list *wlist;
1606 	struct snd_soc_dapm_widget *w = NULL;
1607 	unsigned int wi;
1608 	int ret;
1609 
1610 	if (!update || !dapm_kcontrol_is_powered(update->kcontrol))
1611 		return;
1612 
1613 	wlist = dapm_kcontrol_get_wlist(update->kcontrol);
1614 
1615 	for (wi = 0; wi < wlist->num_widgets; wi++) {
1616 		w = wlist->widgets[wi];
1617 
1618 		if (w->event && (w->event_flags & SND_SOC_DAPM_PRE_REG)) {
1619 			ret = w->event(w, update->kcontrol, SND_SOC_DAPM_PRE_REG);
1620 			if (ret != 0)
1621 				dev_err(w->dapm->dev, "ASoC: %s DAPM pre-event failed: %d\n",
1622 					   w->name, ret);
1623 		}
1624 	}
1625 
1626 	if (!w)
1627 		return;
1628 
1629 	ret = soc_dapm_update_bits(w->dapm, update->reg, update->mask,
1630 		update->val);
1631 	if (ret < 0)
1632 		dev_err(w->dapm->dev, "ASoC: %s DAPM update failed: %d\n",
1633 			w->name, ret);
1634 
1635 	for (wi = 0; wi < wlist->num_widgets; wi++) {
1636 		w = wlist->widgets[wi];
1637 
1638 		if (w->event && (w->event_flags & SND_SOC_DAPM_POST_REG)) {
1639 			ret = w->event(w, update->kcontrol, SND_SOC_DAPM_POST_REG);
1640 			if (ret != 0)
1641 				dev_err(w->dapm->dev, "ASoC: %s DAPM post-event failed: %d\n",
1642 					   w->name, ret);
1643 		}
1644 	}
1645 }
1646 
1647 /* Async callback run prior to DAPM sequences - brings to _PREPARE if
1648  * they're changing state.
1649  */
1650 static void dapm_pre_sequence_async(void *data, async_cookie_t cookie)
1651 {
1652 	struct snd_soc_dapm_context *d = data;
1653 	int ret;
1654 
1655 	/* If we're off and we're not supposed to be go into STANDBY */
1656 	if (d->bias_level == SND_SOC_BIAS_OFF &&
1657 	    d->target_bias_level != SND_SOC_BIAS_OFF) {
1658 		if (d->dev)
1659 			pm_runtime_get_sync(d->dev);
1660 
1661 		ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_STANDBY);
1662 		if (ret != 0)
1663 			dev_err(d->dev,
1664 				"ASoC: Failed to turn on bias: %d\n", ret);
1665 	}
1666 
1667 	/* Prepare for a transition to ON or away from ON */
1668 	if ((d->target_bias_level == SND_SOC_BIAS_ON &&
1669 	     d->bias_level != SND_SOC_BIAS_ON) ||
1670 	    (d->target_bias_level != SND_SOC_BIAS_ON &&
1671 	     d->bias_level == SND_SOC_BIAS_ON)) {
1672 		ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_PREPARE);
1673 		if (ret != 0)
1674 			dev_err(d->dev,
1675 				"ASoC: Failed to prepare bias: %d\n", ret);
1676 	}
1677 }
1678 
1679 /* Async callback run prior to DAPM sequences - brings to their final
1680  * state.
1681  */
1682 static void dapm_post_sequence_async(void *data, async_cookie_t cookie)
1683 {
1684 	struct snd_soc_dapm_context *d = data;
1685 	int ret;
1686 
1687 	/* If we just powered the last thing off drop to standby bias */
1688 	if (d->bias_level == SND_SOC_BIAS_PREPARE &&
1689 	    (d->target_bias_level == SND_SOC_BIAS_STANDBY ||
1690 	     d->target_bias_level == SND_SOC_BIAS_OFF)) {
1691 		ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_STANDBY);
1692 		if (ret != 0)
1693 			dev_err(d->dev, "ASoC: Failed to apply standby bias: %d\n",
1694 				ret);
1695 	}
1696 
1697 	/* If we're in standby and can support bias off then do that */
1698 	if (d->bias_level == SND_SOC_BIAS_STANDBY &&
1699 	    d->target_bias_level == SND_SOC_BIAS_OFF) {
1700 		ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_OFF);
1701 		if (ret != 0)
1702 			dev_err(d->dev, "ASoC: Failed to turn off bias: %d\n",
1703 				ret);
1704 
1705 		if (d->dev)
1706 			pm_runtime_put(d->dev);
1707 	}
1708 
1709 	/* If we just powered up then move to active bias */
1710 	if (d->bias_level == SND_SOC_BIAS_PREPARE &&
1711 	    d->target_bias_level == SND_SOC_BIAS_ON) {
1712 		ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_ON);
1713 		if (ret != 0)
1714 			dev_err(d->dev, "ASoC: Failed to apply active bias: %d\n",
1715 				ret);
1716 	}
1717 }
1718 
1719 static void dapm_widget_set_peer_power(struct snd_soc_dapm_widget *peer,
1720 				       bool power, bool connect)
1721 {
1722 	/* If a connection is being made or broken then that update
1723 	 * will have marked the peer dirty, otherwise the widgets are
1724 	 * not connected and this update has no impact. */
1725 	if (!connect)
1726 		return;
1727 
1728 	/* If the peer is already in the state we're moving to then we
1729 	 * won't have an impact on it. */
1730 	if (power != peer->power)
1731 		dapm_mark_dirty(peer, "peer state change");
1732 }
1733 
1734 static void dapm_widget_set_power(struct snd_soc_dapm_widget *w, bool power,
1735 				  struct list_head *up_list,
1736 				  struct list_head *down_list)
1737 {
1738 	struct snd_soc_dapm_path *path;
1739 
1740 	if (w->power == power)
1741 		return;
1742 
1743 	trace_snd_soc_dapm_widget_power(w, power);
1744 
1745 	/* If we changed our power state perhaps our neigbours changed
1746 	 * also.
1747 	 */
1748 	list_for_each_entry(path, &w->sources, list_sink)
1749 		dapm_widget_set_peer_power(path->source, power, path->connect);
1750 
1751 	/* Supplies can't affect their outputs, only their inputs */
1752 	if (!w->is_supply) {
1753 		list_for_each_entry(path, &w->sinks, list_source)
1754 			dapm_widget_set_peer_power(path->sink, power,
1755 						   path->connect);
1756 	}
1757 
1758 	if (power)
1759 		dapm_seq_insert(w, up_list, true);
1760 	else
1761 		dapm_seq_insert(w, down_list, false);
1762 }
1763 
1764 static void dapm_power_one_widget(struct snd_soc_dapm_widget *w,
1765 				  struct list_head *up_list,
1766 				  struct list_head *down_list)
1767 {
1768 	int power;
1769 
1770 	switch (w->id) {
1771 	case snd_soc_dapm_pre:
1772 		dapm_seq_insert(w, down_list, false);
1773 		break;
1774 	case snd_soc_dapm_post:
1775 		dapm_seq_insert(w, up_list, true);
1776 		break;
1777 
1778 	default:
1779 		power = dapm_widget_power_check(w);
1780 
1781 		dapm_widget_set_power(w, power, up_list, down_list);
1782 		break;
1783 	}
1784 }
1785 
1786 static bool dapm_idle_bias_off(struct snd_soc_dapm_context *dapm)
1787 {
1788 	if (dapm->idle_bias_off)
1789 		return true;
1790 
1791 	switch (snd_power_get_state(dapm->card->snd_card)) {
1792 	case SNDRV_CTL_POWER_D3hot:
1793 	case SNDRV_CTL_POWER_D3cold:
1794 		return dapm->suspend_bias_off;
1795 	default:
1796 		break;
1797 	}
1798 
1799 	return false;
1800 }
1801 
1802 /*
1803  * Scan each dapm widget for complete audio path.
1804  * A complete path is a route that has valid endpoints i.e.:-
1805  *
1806  *  o DAC to output pin.
1807  *  o Input Pin to ADC.
1808  *  o Input pin to Output pin (bypass, sidetone)
1809  *  o DAC to ADC (loopback).
1810  */
1811 static int dapm_power_widgets(struct snd_soc_card *card, int event)
1812 {
1813 	struct snd_soc_dapm_widget *w;
1814 	struct snd_soc_dapm_context *d;
1815 	LIST_HEAD(up_list);
1816 	LIST_HEAD(down_list);
1817 	ASYNC_DOMAIN_EXCLUSIVE(async_domain);
1818 	enum snd_soc_bias_level bias;
1819 
1820 	lockdep_assert_held(&card->dapm_mutex);
1821 
1822 	trace_snd_soc_dapm_start(card);
1823 
1824 	list_for_each_entry(d, &card->dapm_list, list) {
1825 		if (dapm_idle_bias_off(d))
1826 			d->target_bias_level = SND_SOC_BIAS_OFF;
1827 		else
1828 			d->target_bias_level = SND_SOC_BIAS_STANDBY;
1829 	}
1830 
1831 	dapm_reset(card);
1832 
1833 	/* Check which widgets we need to power and store them in
1834 	 * lists indicating if they should be powered up or down.  We
1835 	 * only check widgets that have been flagged as dirty but note
1836 	 * that new widgets may be added to the dirty list while we
1837 	 * iterate.
1838 	 */
1839 	list_for_each_entry(w, &card->dapm_dirty, dirty) {
1840 		dapm_power_one_widget(w, &up_list, &down_list);
1841 	}
1842 
1843 	list_for_each_entry(w, &card->widgets, list) {
1844 		switch (w->id) {
1845 		case snd_soc_dapm_pre:
1846 		case snd_soc_dapm_post:
1847 			/* These widgets always need to be powered */
1848 			break;
1849 		default:
1850 			list_del_init(&w->dirty);
1851 			break;
1852 		}
1853 
1854 		if (w->new_power) {
1855 			d = w->dapm;
1856 
1857 			/* Supplies and micbiases only bring the
1858 			 * context up to STANDBY as unless something
1859 			 * else is active and passing audio they
1860 			 * generally don't require full power.  Signal
1861 			 * generators are virtual pins and have no
1862 			 * power impact themselves.
1863 			 */
1864 			switch (w->id) {
1865 			case snd_soc_dapm_siggen:
1866 			case snd_soc_dapm_vmid:
1867 				break;
1868 			case snd_soc_dapm_supply:
1869 			case snd_soc_dapm_regulator_supply:
1870 			case snd_soc_dapm_clock_supply:
1871 			case snd_soc_dapm_micbias:
1872 				if (d->target_bias_level < SND_SOC_BIAS_STANDBY)
1873 					d->target_bias_level = SND_SOC_BIAS_STANDBY;
1874 				break;
1875 			default:
1876 				d->target_bias_level = SND_SOC_BIAS_ON;
1877 				break;
1878 			}
1879 		}
1880 
1881 	}
1882 
1883 	/* Force all contexts in the card to the same bias state if
1884 	 * they're not ground referenced.
1885 	 */
1886 	bias = SND_SOC_BIAS_OFF;
1887 	list_for_each_entry(d, &card->dapm_list, list)
1888 		if (d->target_bias_level > bias)
1889 			bias = d->target_bias_level;
1890 	list_for_each_entry(d, &card->dapm_list, list)
1891 		if (!dapm_idle_bias_off(d))
1892 			d->target_bias_level = bias;
1893 
1894 	trace_snd_soc_dapm_walk_done(card);
1895 
1896 	/* Run card bias changes at first */
1897 	dapm_pre_sequence_async(&card->dapm, 0);
1898 	/* Run other bias changes in parallel */
1899 	list_for_each_entry(d, &card->dapm_list, list) {
1900 		if (d != &card->dapm)
1901 			async_schedule_domain(dapm_pre_sequence_async, d,
1902 						&async_domain);
1903 	}
1904 	async_synchronize_full_domain(&async_domain);
1905 
1906 	list_for_each_entry(w, &down_list, power_list) {
1907 		dapm_seq_check_event(card, w, SND_SOC_DAPM_WILL_PMD);
1908 	}
1909 
1910 	list_for_each_entry(w, &up_list, power_list) {
1911 		dapm_seq_check_event(card, w, SND_SOC_DAPM_WILL_PMU);
1912 	}
1913 
1914 	/* Power down widgets first; try to avoid amplifying pops. */
1915 	dapm_seq_run(card, &down_list, event, false);
1916 
1917 	dapm_widget_update(card);
1918 
1919 	/* Now power up. */
1920 	dapm_seq_run(card, &up_list, event, true);
1921 
1922 	/* Run all the bias changes in parallel */
1923 	list_for_each_entry(d, &card->dapm_list, list) {
1924 		if (d != &card->dapm)
1925 			async_schedule_domain(dapm_post_sequence_async, d,
1926 						&async_domain);
1927 	}
1928 	async_synchronize_full_domain(&async_domain);
1929 	/* Run card bias changes at last */
1930 	dapm_post_sequence_async(&card->dapm, 0);
1931 
1932 	/* do we need to notify any clients that DAPM event is complete */
1933 	list_for_each_entry(d, &card->dapm_list, list) {
1934 		if (d->stream_event)
1935 			d->stream_event(d, event);
1936 	}
1937 
1938 	pop_dbg(card->dev, card->pop_time,
1939 		"DAPM sequencing finished, waiting %dms\n", card->pop_time);
1940 	pop_wait(card->pop_time);
1941 
1942 	trace_snd_soc_dapm_done(card);
1943 
1944 	return 0;
1945 }
1946 
1947 #ifdef CONFIG_DEBUG_FS
1948 static ssize_t dapm_widget_power_read_file(struct file *file,
1949 					   char __user *user_buf,
1950 					   size_t count, loff_t *ppos)
1951 {
1952 	struct snd_soc_dapm_widget *w = file->private_data;
1953 	struct snd_soc_card *card = w->dapm->card;
1954 	char *buf;
1955 	int in, out;
1956 	ssize_t ret;
1957 	struct snd_soc_dapm_path *p = NULL;
1958 
1959 	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
1960 	if (!buf)
1961 		return -ENOMEM;
1962 
1963 	mutex_lock(&card->dapm_mutex);
1964 
1965 	/* Supply widgets are not handled by is_connected_{input,output}_ep() */
1966 	if (w->is_supply) {
1967 		in = 0;
1968 		out = 0;
1969 	} else {
1970 		in = is_connected_input_ep(w, NULL);
1971 		out = is_connected_output_ep(w, NULL);
1972 	}
1973 
1974 	ret = snprintf(buf, PAGE_SIZE, "%s: %s%s  in %d out %d",
1975 		       w->name, w->power ? "On" : "Off",
1976 		       w->force ? " (forced)" : "", in, out);
1977 
1978 	if (w->reg >= 0)
1979 		ret += snprintf(buf + ret, PAGE_SIZE - ret,
1980 				" - R%d(0x%x) mask 0x%x",
1981 				w->reg, w->reg, w->mask << w->shift);
1982 
1983 	ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
1984 
1985 	if (w->sname)
1986 		ret += snprintf(buf + ret, PAGE_SIZE - ret, " stream %s %s\n",
1987 				w->sname,
1988 				w->active ? "active" : "inactive");
1989 
1990 	list_for_each_entry(p, &w->sources, list_sink) {
1991 		if (p->connected && !p->connected(w, p->source))
1992 			continue;
1993 
1994 		if (p->connect)
1995 			ret += snprintf(buf + ret, PAGE_SIZE - ret,
1996 					" in  \"%s\" \"%s\"\n",
1997 					p->name ? p->name : "static",
1998 					p->source->name);
1999 	}
2000 	list_for_each_entry(p, &w->sinks, list_source) {
2001 		if (p->connected && !p->connected(w, p->sink))
2002 			continue;
2003 
2004 		if (p->connect)
2005 			ret += snprintf(buf + ret, PAGE_SIZE - ret,
2006 					" out \"%s\" \"%s\"\n",
2007 					p->name ? p->name : "static",
2008 					p->sink->name);
2009 	}
2010 
2011 	mutex_unlock(&card->dapm_mutex);
2012 
2013 	ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
2014 
2015 	kfree(buf);
2016 	return ret;
2017 }
2018 
2019 static const struct file_operations dapm_widget_power_fops = {
2020 	.open = simple_open,
2021 	.read = dapm_widget_power_read_file,
2022 	.llseek = default_llseek,
2023 };
2024 
2025 static ssize_t dapm_bias_read_file(struct file *file, char __user *user_buf,
2026 				   size_t count, loff_t *ppos)
2027 {
2028 	struct snd_soc_dapm_context *dapm = file->private_data;
2029 	char *level;
2030 
2031 	switch (dapm->bias_level) {
2032 	case SND_SOC_BIAS_ON:
2033 		level = "On\n";
2034 		break;
2035 	case SND_SOC_BIAS_PREPARE:
2036 		level = "Prepare\n";
2037 		break;
2038 	case SND_SOC_BIAS_STANDBY:
2039 		level = "Standby\n";
2040 		break;
2041 	case SND_SOC_BIAS_OFF:
2042 		level = "Off\n";
2043 		break;
2044 	default:
2045 		WARN(1, "Unknown bias_level %d\n", dapm->bias_level);
2046 		level = "Unknown\n";
2047 		break;
2048 	}
2049 
2050 	return simple_read_from_buffer(user_buf, count, ppos, level,
2051 				       strlen(level));
2052 }
2053 
2054 static const struct file_operations dapm_bias_fops = {
2055 	.open = simple_open,
2056 	.read = dapm_bias_read_file,
2057 	.llseek = default_llseek,
2058 };
2059 
2060 void snd_soc_dapm_debugfs_init(struct snd_soc_dapm_context *dapm,
2061 	struct dentry *parent)
2062 {
2063 	struct dentry *d;
2064 
2065 	if (!parent)
2066 		return;
2067 
2068 	dapm->debugfs_dapm = debugfs_create_dir("dapm", parent);
2069 
2070 	if (!dapm->debugfs_dapm) {
2071 		dev_warn(dapm->dev,
2072 		       "ASoC: Failed to create DAPM debugfs directory\n");
2073 		return;
2074 	}
2075 
2076 	d = debugfs_create_file("bias_level", 0444,
2077 				dapm->debugfs_dapm, dapm,
2078 				&dapm_bias_fops);
2079 	if (!d)
2080 		dev_warn(dapm->dev,
2081 			 "ASoC: Failed to create bias level debugfs file\n");
2082 }
2083 
2084 static void dapm_debugfs_add_widget(struct snd_soc_dapm_widget *w)
2085 {
2086 	struct snd_soc_dapm_context *dapm = w->dapm;
2087 	struct dentry *d;
2088 
2089 	if (!dapm->debugfs_dapm || !w->name)
2090 		return;
2091 
2092 	d = debugfs_create_file(w->name, 0444,
2093 				dapm->debugfs_dapm, w,
2094 				&dapm_widget_power_fops);
2095 	if (!d)
2096 		dev_warn(w->dapm->dev,
2097 			"ASoC: Failed to create %s debugfs file\n",
2098 			w->name);
2099 }
2100 
2101 static void dapm_debugfs_cleanup(struct snd_soc_dapm_context *dapm)
2102 {
2103 	debugfs_remove_recursive(dapm->debugfs_dapm);
2104 }
2105 
2106 #else
2107 void snd_soc_dapm_debugfs_init(struct snd_soc_dapm_context *dapm,
2108 	struct dentry *parent)
2109 {
2110 }
2111 
2112 static inline void dapm_debugfs_add_widget(struct snd_soc_dapm_widget *w)
2113 {
2114 }
2115 
2116 static inline void dapm_debugfs_cleanup(struct snd_soc_dapm_context *dapm)
2117 {
2118 }
2119 
2120 #endif
2121 
2122 /*
2123  * soc_dapm_connect_path() - Connects or disconnects a path
2124  * @path: The path to update
2125  * @connect: The new connect state of the path. True if the path is connected,
2126  *  false if it is disconneted.
2127  * @reason: The reason why the path changed (for debugging only)
2128  */
2129 static void soc_dapm_connect_path(struct snd_soc_dapm_path *path,
2130 	bool connect, const char *reason)
2131 {
2132 	if (path->connect == connect)
2133 		return;
2134 
2135 	path->connect = connect;
2136 	dapm_mark_dirty(path->source, reason);
2137 	dapm_mark_dirty(path->sink, reason);
2138 	dapm_path_invalidate(path);
2139 }
2140 
2141 /* test and update the power status of a mux widget */
2142 static int soc_dapm_mux_update_power(struct snd_soc_card *card,
2143 				 struct snd_kcontrol *kcontrol, int mux, struct soc_enum *e)
2144 {
2145 	struct snd_soc_dapm_path *path;
2146 	int found = 0;
2147 	bool connect;
2148 
2149 	lockdep_assert_held(&card->dapm_mutex);
2150 
2151 	/* find dapm widget path assoc with kcontrol */
2152 	dapm_kcontrol_for_each_path(path, kcontrol) {
2153 		found = 1;
2154 		/* we now need to match the string in the enum to the path */
2155 		if (!(strcmp(path->name, e->texts[mux])))
2156 			connect = true;
2157 		else
2158 			connect = false;
2159 
2160 		soc_dapm_connect_path(path, connect, "mux update");
2161 	}
2162 
2163 	if (found)
2164 		dapm_power_widgets(card, SND_SOC_DAPM_STREAM_NOP);
2165 
2166 	return found;
2167 }
2168 
2169 int snd_soc_dapm_mux_update_power(struct snd_soc_dapm_context *dapm,
2170 	struct snd_kcontrol *kcontrol, int mux, struct soc_enum *e,
2171 	struct snd_soc_dapm_update *update)
2172 {
2173 	struct snd_soc_card *card = dapm->card;
2174 	int ret;
2175 
2176 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2177 	card->update = update;
2178 	ret = soc_dapm_mux_update_power(card, kcontrol, mux, e);
2179 	card->update = NULL;
2180 	mutex_unlock(&card->dapm_mutex);
2181 	if (ret > 0)
2182 		soc_dpcm_runtime_update(card);
2183 	return ret;
2184 }
2185 EXPORT_SYMBOL_GPL(snd_soc_dapm_mux_update_power);
2186 
2187 /* test and update the power status of a mixer or switch widget */
2188 static int soc_dapm_mixer_update_power(struct snd_soc_card *card,
2189 				   struct snd_kcontrol *kcontrol, int connect)
2190 {
2191 	struct snd_soc_dapm_path *path;
2192 	int found = 0;
2193 
2194 	lockdep_assert_held(&card->dapm_mutex);
2195 
2196 	/* find dapm widget path assoc with kcontrol */
2197 	dapm_kcontrol_for_each_path(path, kcontrol) {
2198 		found = 1;
2199 		soc_dapm_connect_path(path, connect, "mixer update");
2200 	}
2201 
2202 	if (found)
2203 		dapm_power_widgets(card, SND_SOC_DAPM_STREAM_NOP);
2204 
2205 	return found;
2206 }
2207 
2208 int snd_soc_dapm_mixer_update_power(struct snd_soc_dapm_context *dapm,
2209 	struct snd_kcontrol *kcontrol, int connect,
2210 	struct snd_soc_dapm_update *update)
2211 {
2212 	struct snd_soc_card *card = dapm->card;
2213 	int ret;
2214 
2215 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2216 	card->update = update;
2217 	ret = soc_dapm_mixer_update_power(card, kcontrol, connect);
2218 	card->update = NULL;
2219 	mutex_unlock(&card->dapm_mutex);
2220 	if (ret > 0)
2221 		soc_dpcm_runtime_update(card);
2222 	return ret;
2223 }
2224 EXPORT_SYMBOL_GPL(snd_soc_dapm_mixer_update_power);
2225 
2226 static ssize_t dapm_widget_show_codec(struct snd_soc_codec *codec, char *buf)
2227 {
2228 	struct snd_soc_dapm_widget *w;
2229 	int count = 0;
2230 	char *state = "not set";
2231 
2232 	list_for_each_entry(w, &codec->component.card->widgets, list) {
2233 		if (w->dapm != &codec->dapm)
2234 			continue;
2235 
2236 		/* only display widgets that burnm power */
2237 		switch (w->id) {
2238 		case snd_soc_dapm_hp:
2239 		case snd_soc_dapm_mic:
2240 		case snd_soc_dapm_spk:
2241 		case snd_soc_dapm_line:
2242 		case snd_soc_dapm_micbias:
2243 		case snd_soc_dapm_dac:
2244 		case snd_soc_dapm_adc:
2245 		case snd_soc_dapm_pga:
2246 		case snd_soc_dapm_out_drv:
2247 		case snd_soc_dapm_mixer:
2248 		case snd_soc_dapm_mixer_named_ctl:
2249 		case snd_soc_dapm_supply:
2250 		case snd_soc_dapm_regulator_supply:
2251 		case snd_soc_dapm_clock_supply:
2252 			if (w->name)
2253 				count += sprintf(buf + count, "%s: %s\n",
2254 					w->name, w->power ? "On":"Off");
2255 		break;
2256 		default:
2257 		break;
2258 		}
2259 	}
2260 
2261 	switch (codec->dapm.bias_level) {
2262 	case SND_SOC_BIAS_ON:
2263 		state = "On";
2264 		break;
2265 	case SND_SOC_BIAS_PREPARE:
2266 		state = "Prepare";
2267 		break;
2268 	case SND_SOC_BIAS_STANDBY:
2269 		state = "Standby";
2270 		break;
2271 	case SND_SOC_BIAS_OFF:
2272 		state = "Off";
2273 		break;
2274 	}
2275 	count += sprintf(buf + count, "PM State: %s\n", state);
2276 
2277 	return count;
2278 }
2279 
2280 /* show dapm widget status in sys fs */
2281 static ssize_t dapm_widget_show(struct device *dev,
2282 	struct device_attribute *attr, char *buf)
2283 {
2284 	struct snd_soc_pcm_runtime *rtd = dev_get_drvdata(dev);
2285 	int i, count = 0;
2286 
2287 	mutex_lock(&rtd->card->dapm_mutex);
2288 
2289 	for (i = 0; i < rtd->num_codecs; i++) {
2290 		struct snd_soc_codec *codec = rtd->codec_dais[i]->codec;
2291 		count += dapm_widget_show_codec(codec, buf + count);
2292 	}
2293 
2294 	mutex_unlock(&rtd->card->dapm_mutex);
2295 
2296 	return count;
2297 }
2298 
2299 static DEVICE_ATTR(dapm_widget, 0444, dapm_widget_show, NULL);
2300 
2301 struct attribute *soc_dapm_dev_attrs[] = {
2302 	&dev_attr_dapm_widget.attr,
2303 	NULL
2304 };
2305 
2306 static void dapm_free_path(struct snd_soc_dapm_path *path)
2307 {
2308 	list_del(&path->list_sink);
2309 	list_del(&path->list_source);
2310 	list_del(&path->list_kcontrol);
2311 	list_del(&path->list);
2312 	kfree(path);
2313 }
2314 
2315 /* free all dapm widgets and resources */
2316 static void dapm_free_widgets(struct snd_soc_dapm_context *dapm)
2317 {
2318 	struct snd_soc_dapm_widget *w, *next_w;
2319 	struct snd_soc_dapm_path *p, *next_p;
2320 
2321 	list_for_each_entry_safe(w, next_w, &dapm->card->widgets, list) {
2322 		if (w->dapm != dapm)
2323 			continue;
2324 		list_del(&w->list);
2325 		/*
2326 		 * remove source and sink paths associated to this widget.
2327 		 * While removing the path, remove reference to it from both
2328 		 * source and sink widgets so that path is removed only once.
2329 		 */
2330 		list_for_each_entry_safe(p, next_p, &w->sources, list_sink)
2331 			dapm_free_path(p);
2332 
2333 		list_for_each_entry_safe(p, next_p, &w->sinks, list_source)
2334 			dapm_free_path(p);
2335 
2336 		kfree(w->kcontrols);
2337 		kfree(w->name);
2338 		kfree(w);
2339 	}
2340 }
2341 
2342 static struct snd_soc_dapm_widget *dapm_find_widget(
2343 			struct snd_soc_dapm_context *dapm, const char *pin,
2344 			bool search_other_contexts)
2345 {
2346 	struct snd_soc_dapm_widget *w;
2347 	struct snd_soc_dapm_widget *fallback = NULL;
2348 
2349 	list_for_each_entry(w, &dapm->card->widgets, list) {
2350 		if (!strcmp(w->name, pin)) {
2351 			if (w->dapm == dapm)
2352 				return w;
2353 			else
2354 				fallback = w;
2355 		}
2356 	}
2357 
2358 	if (search_other_contexts)
2359 		return fallback;
2360 
2361 	return NULL;
2362 }
2363 
2364 static int snd_soc_dapm_set_pin(struct snd_soc_dapm_context *dapm,
2365 				const char *pin, int status)
2366 {
2367 	struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);
2368 
2369 	dapm_assert_locked(dapm);
2370 
2371 	if (!w) {
2372 		dev_err(dapm->dev, "ASoC: DAPM unknown pin %s\n", pin);
2373 		return -EINVAL;
2374 	}
2375 
2376 	if (w->connected != status) {
2377 		dapm_mark_dirty(w, "pin configuration");
2378 		dapm_widget_invalidate_input_paths(w);
2379 		dapm_widget_invalidate_output_paths(w);
2380 	}
2381 
2382 	w->connected = status;
2383 	if (status == 0)
2384 		w->force = 0;
2385 
2386 	return 0;
2387 }
2388 
2389 /**
2390  * snd_soc_dapm_sync_unlocked - scan and power dapm paths
2391  * @dapm: DAPM context
2392  *
2393  * Walks all dapm audio paths and powers widgets according to their
2394  * stream or path usage.
2395  *
2396  * Requires external locking.
2397  *
2398  * Returns 0 for success.
2399  */
2400 int snd_soc_dapm_sync_unlocked(struct snd_soc_dapm_context *dapm)
2401 {
2402 	/*
2403 	 * Suppress early reports (eg, jacks syncing their state) to avoid
2404 	 * silly DAPM runs during card startup.
2405 	 */
2406 	if (!dapm->card || !dapm->card->instantiated)
2407 		return 0;
2408 
2409 	return dapm_power_widgets(dapm->card, SND_SOC_DAPM_STREAM_NOP);
2410 }
2411 EXPORT_SYMBOL_GPL(snd_soc_dapm_sync_unlocked);
2412 
2413 /**
2414  * snd_soc_dapm_sync - scan and power dapm paths
2415  * @dapm: DAPM context
2416  *
2417  * Walks all dapm audio paths and powers widgets according to their
2418  * stream or path usage.
2419  *
2420  * Returns 0 for success.
2421  */
2422 int snd_soc_dapm_sync(struct snd_soc_dapm_context *dapm)
2423 {
2424 	int ret;
2425 
2426 	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2427 	ret = snd_soc_dapm_sync_unlocked(dapm);
2428 	mutex_unlock(&dapm->card->dapm_mutex);
2429 	return ret;
2430 }
2431 EXPORT_SYMBOL_GPL(snd_soc_dapm_sync);
2432 
2433 /*
2434  * dapm_update_widget_flags() - Re-compute widget sink and source flags
2435  * @w: The widget for which to update the flags
2436  *
2437  * Some widgets have a dynamic category which depends on which neighbors they
2438  * are connected to. This function update the category for these widgets.
2439  *
2440  * This function must be called whenever a path is added or removed to a widget.
2441  */
2442 static void dapm_update_widget_flags(struct snd_soc_dapm_widget *w)
2443 {
2444 	struct snd_soc_dapm_path *p;
2445 
2446 	switch (w->id) {
2447 	case snd_soc_dapm_input:
2448 		/* On a fully routed card a input is never a source */
2449 		if (w->dapm->card->fully_routed)
2450 			break;
2451 		w->is_source = 1;
2452 		list_for_each_entry(p, &w->sources, list_sink) {
2453 			if (p->source->id == snd_soc_dapm_micbias ||
2454 				p->source->id == snd_soc_dapm_mic ||
2455 				p->source->id == snd_soc_dapm_line ||
2456 				p->source->id == snd_soc_dapm_output) {
2457 					w->is_source = 0;
2458 					break;
2459 			}
2460 		}
2461 		break;
2462 	case snd_soc_dapm_output:
2463 		/* On a fully routed card a output is never a sink */
2464 		if (w->dapm->card->fully_routed)
2465 			break;
2466 		w->is_sink = 1;
2467 		list_for_each_entry(p, &w->sinks, list_source) {
2468 			if (p->sink->id == snd_soc_dapm_spk ||
2469 				p->sink->id == snd_soc_dapm_hp ||
2470 				p->sink->id == snd_soc_dapm_line ||
2471 				p->sink->id == snd_soc_dapm_input) {
2472 					w->is_sink = 0;
2473 					break;
2474 			}
2475 		}
2476 		break;
2477 	case snd_soc_dapm_line:
2478 		w->is_sink = !list_empty(&w->sources);
2479 		w->is_source = !list_empty(&w->sinks);
2480 		break;
2481 	default:
2482 		break;
2483 	}
2484 }
2485 
2486 static int snd_soc_dapm_check_dynamic_path(struct snd_soc_dapm_context *dapm,
2487 	struct snd_soc_dapm_widget *source, struct snd_soc_dapm_widget *sink,
2488 	const char *control)
2489 {
2490 	bool dynamic_source = false;
2491 	bool dynamic_sink = false;
2492 
2493 	if (!control)
2494 		return 0;
2495 
2496 	switch (source->id) {
2497 	case snd_soc_dapm_demux:
2498 		dynamic_source = true;
2499 		break;
2500 	default:
2501 		break;
2502 	}
2503 
2504 	switch (sink->id) {
2505 	case snd_soc_dapm_mux:
2506 	case snd_soc_dapm_switch:
2507 	case snd_soc_dapm_mixer:
2508 	case snd_soc_dapm_mixer_named_ctl:
2509 		dynamic_sink = true;
2510 		break;
2511 	default:
2512 		break;
2513 	}
2514 
2515 	if (dynamic_source && dynamic_sink) {
2516 		dev_err(dapm->dev,
2517 			"Direct connection between demux and mixer/mux not supported for path %s -> [%s] -> %s\n",
2518 			source->name, control, sink->name);
2519 		return -EINVAL;
2520 	} else if (!dynamic_source && !dynamic_sink) {
2521 		dev_err(dapm->dev,
2522 			"Control not supported for path %s -> [%s] -> %s\n",
2523 			source->name, control, sink->name);
2524 		return -EINVAL;
2525 	}
2526 
2527 	return 0;
2528 }
2529 
2530 static int snd_soc_dapm_add_path(struct snd_soc_dapm_context *dapm,
2531 	struct snd_soc_dapm_widget *wsource, struct snd_soc_dapm_widget *wsink,
2532 	const char *control,
2533 	int (*connected)(struct snd_soc_dapm_widget *source,
2534 			 struct snd_soc_dapm_widget *sink))
2535 {
2536 	struct snd_soc_dapm_path *path;
2537 	int ret;
2538 
2539 	if (wsink->is_supply && !wsource->is_supply) {
2540 		dev_err(dapm->dev,
2541 			"Connecting non-supply widget to supply widget is not supported (%s -> %s)\n",
2542 			wsource->name, wsink->name);
2543 		return -EINVAL;
2544 	}
2545 
2546 	if (connected && !wsource->is_supply) {
2547 		dev_err(dapm->dev,
2548 			"connected() callback only supported for supply widgets (%s -> %s)\n",
2549 			wsource->name, wsink->name);
2550 		return -EINVAL;
2551 	}
2552 
2553 	if (wsource->is_supply && control) {
2554 		dev_err(dapm->dev,
2555 			"Conditional paths are not supported for supply widgets (%s -> [%s] -> %s)\n",
2556 			wsource->name, control, wsink->name);
2557 		return -EINVAL;
2558 	}
2559 
2560 	ret = snd_soc_dapm_check_dynamic_path(dapm, wsource, wsink, control);
2561 	if (ret)
2562 		return ret;
2563 
2564 	path = kzalloc(sizeof(struct snd_soc_dapm_path), GFP_KERNEL);
2565 	if (!path)
2566 		return -ENOMEM;
2567 
2568 	path->source = wsource;
2569 	path->sink = wsink;
2570 	path->connected = connected;
2571 	INIT_LIST_HEAD(&path->list);
2572 	INIT_LIST_HEAD(&path->list_kcontrol);
2573 	INIT_LIST_HEAD(&path->list_source);
2574 	INIT_LIST_HEAD(&path->list_sink);
2575 
2576 	if (wsource->is_supply || wsink->is_supply)
2577 		path->is_supply = 1;
2578 
2579 	/* connect static paths */
2580 	if (control == NULL) {
2581 		path->connect = 1;
2582 	} else {
2583 		switch (wsource->id) {
2584 		case snd_soc_dapm_demux:
2585 			ret = dapm_connect_mux(dapm, path, control, wsource);
2586 			if (ret)
2587 				goto err;
2588 			break;
2589 		default:
2590 			break;
2591 		}
2592 
2593 		switch (wsink->id) {
2594 		case snd_soc_dapm_mux:
2595 			ret = dapm_connect_mux(dapm, path, control, wsink);
2596 			if (ret != 0)
2597 				goto err;
2598 			break;
2599 		case snd_soc_dapm_switch:
2600 		case snd_soc_dapm_mixer:
2601 		case snd_soc_dapm_mixer_named_ctl:
2602 			ret = dapm_connect_mixer(dapm, path, control);
2603 			if (ret != 0)
2604 				goto err;
2605 			break;
2606 		default:
2607 			break;
2608 		}
2609 	}
2610 
2611 	list_add(&path->list, &dapm->card->paths);
2612 	list_add(&path->list_sink, &wsink->sources);
2613 	list_add(&path->list_source, &wsource->sinks);
2614 
2615 	dapm_update_widget_flags(wsource);
2616 	dapm_update_widget_flags(wsink);
2617 
2618 	dapm_mark_dirty(wsource, "Route added");
2619 	dapm_mark_dirty(wsink, "Route added");
2620 
2621 	if (dapm->card->instantiated && path->connect)
2622 		dapm_path_invalidate(path);
2623 
2624 	return 0;
2625 err:
2626 	kfree(path);
2627 	return ret;
2628 }
2629 
2630 static int snd_soc_dapm_add_route(struct snd_soc_dapm_context *dapm,
2631 				  const struct snd_soc_dapm_route *route)
2632 {
2633 	struct snd_soc_dapm_widget *wsource = NULL, *wsink = NULL, *w;
2634 	struct snd_soc_dapm_widget *wtsource = NULL, *wtsink = NULL;
2635 	const char *sink;
2636 	const char *source;
2637 	char prefixed_sink[80];
2638 	char prefixed_source[80];
2639 	const char *prefix;
2640 	int ret;
2641 
2642 	prefix = soc_dapm_prefix(dapm);
2643 	if (prefix) {
2644 		snprintf(prefixed_sink, sizeof(prefixed_sink), "%s %s",
2645 			 prefix, route->sink);
2646 		sink = prefixed_sink;
2647 		snprintf(prefixed_source, sizeof(prefixed_source), "%s %s",
2648 			 prefix, route->source);
2649 		source = prefixed_source;
2650 	} else {
2651 		sink = route->sink;
2652 		source = route->source;
2653 	}
2654 
2655 	wsource = dapm_wcache_lookup(&dapm->path_source_cache, source);
2656 	wsink = dapm_wcache_lookup(&dapm->path_sink_cache, sink);
2657 
2658 	if (wsink && wsource)
2659 		goto skip_search;
2660 
2661 	/*
2662 	 * find src and dest widgets over all widgets but favor a widget from
2663 	 * current DAPM context
2664 	 */
2665 	list_for_each_entry(w, &dapm->card->widgets, list) {
2666 		if (!wsink && !(strcmp(w->name, sink))) {
2667 			wtsink = w;
2668 			if (w->dapm == dapm) {
2669 				wsink = w;
2670 				if (wsource)
2671 					break;
2672 			}
2673 			continue;
2674 		}
2675 		if (!wsource && !(strcmp(w->name, source))) {
2676 			wtsource = w;
2677 			if (w->dapm == dapm) {
2678 				wsource = w;
2679 				if (wsink)
2680 					break;
2681 			}
2682 		}
2683 	}
2684 	/* use widget from another DAPM context if not found from this */
2685 	if (!wsink)
2686 		wsink = wtsink;
2687 	if (!wsource)
2688 		wsource = wtsource;
2689 
2690 	if (wsource == NULL) {
2691 		dev_err(dapm->dev, "ASoC: no source widget found for %s\n",
2692 			route->source);
2693 		return -ENODEV;
2694 	}
2695 	if (wsink == NULL) {
2696 		dev_err(dapm->dev, "ASoC: no sink widget found for %s\n",
2697 			route->sink);
2698 		return -ENODEV;
2699 	}
2700 
2701 skip_search:
2702 	dapm_wcache_update(&dapm->path_sink_cache, wsink);
2703 	dapm_wcache_update(&dapm->path_source_cache, wsource);
2704 
2705 	ret = snd_soc_dapm_add_path(dapm, wsource, wsink, route->control,
2706 		route->connected);
2707 	if (ret)
2708 		goto err;
2709 
2710 	return 0;
2711 err:
2712 	dev_warn(dapm->dev, "ASoC: no dapm match for %s --> %s --> %s\n",
2713 		 source, route->control, sink);
2714 	return ret;
2715 }
2716 
2717 static int snd_soc_dapm_del_route(struct snd_soc_dapm_context *dapm,
2718 				  const struct snd_soc_dapm_route *route)
2719 {
2720 	struct snd_soc_dapm_widget *wsource, *wsink;
2721 	struct snd_soc_dapm_path *path, *p;
2722 	const char *sink;
2723 	const char *source;
2724 	char prefixed_sink[80];
2725 	char prefixed_source[80];
2726 	const char *prefix;
2727 
2728 	if (route->control) {
2729 		dev_err(dapm->dev,
2730 			"ASoC: Removal of routes with controls not supported\n");
2731 		return -EINVAL;
2732 	}
2733 
2734 	prefix = soc_dapm_prefix(dapm);
2735 	if (prefix) {
2736 		snprintf(prefixed_sink, sizeof(prefixed_sink), "%s %s",
2737 			 prefix, route->sink);
2738 		sink = prefixed_sink;
2739 		snprintf(prefixed_source, sizeof(prefixed_source), "%s %s",
2740 			 prefix, route->source);
2741 		source = prefixed_source;
2742 	} else {
2743 		sink = route->sink;
2744 		source = route->source;
2745 	}
2746 
2747 	path = NULL;
2748 	list_for_each_entry(p, &dapm->card->paths, list) {
2749 		if (strcmp(p->source->name, source) != 0)
2750 			continue;
2751 		if (strcmp(p->sink->name, sink) != 0)
2752 			continue;
2753 		path = p;
2754 		break;
2755 	}
2756 
2757 	if (path) {
2758 		wsource = path->source;
2759 		wsink = path->sink;
2760 
2761 		dapm_mark_dirty(wsource, "Route removed");
2762 		dapm_mark_dirty(wsink, "Route removed");
2763 		if (path->connect)
2764 			dapm_path_invalidate(path);
2765 
2766 		dapm_free_path(path);
2767 
2768 		/* Update any path related flags */
2769 		dapm_update_widget_flags(wsource);
2770 		dapm_update_widget_flags(wsink);
2771 	} else {
2772 		dev_warn(dapm->dev, "ASoC: Route %s->%s does not exist\n",
2773 			 source, sink);
2774 	}
2775 
2776 	return 0;
2777 }
2778 
2779 /**
2780  * snd_soc_dapm_add_routes - Add routes between DAPM widgets
2781  * @dapm: DAPM context
2782  * @route: audio routes
2783  * @num: number of routes
2784  *
2785  * Connects 2 dapm widgets together via a named audio path. The sink is
2786  * the widget receiving the audio signal, whilst the source is the sender
2787  * of the audio signal.
2788  *
2789  * Returns 0 for success else error. On error all resources can be freed
2790  * with a call to snd_soc_card_free().
2791  */
2792 int snd_soc_dapm_add_routes(struct snd_soc_dapm_context *dapm,
2793 			    const struct snd_soc_dapm_route *route, int num)
2794 {
2795 	int i, r, ret = 0;
2796 
2797 	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
2798 	for (i = 0; i < num; i++) {
2799 		r = snd_soc_dapm_add_route(dapm, route);
2800 		if (r < 0) {
2801 			dev_err(dapm->dev, "ASoC: Failed to add route %s -> %s -> %s\n",
2802 				route->source,
2803 				route->control ? route->control : "direct",
2804 				route->sink);
2805 			ret = r;
2806 		}
2807 		route++;
2808 	}
2809 	mutex_unlock(&dapm->card->dapm_mutex);
2810 
2811 	return ret;
2812 }
2813 EXPORT_SYMBOL_GPL(snd_soc_dapm_add_routes);
2814 
2815 /**
2816  * snd_soc_dapm_del_routes - Remove routes between DAPM widgets
2817  * @dapm: DAPM context
2818  * @route: audio routes
2819  * @num: number of routes
2820  *
2821  * Removes routes from the DAPM context.
2822  */
2823 int snd_soc_dapm_del_routes(struct snd_soc_dapm_context *dapm,
2824 			    const struct snd_soc_dapm_route *route, int num)
2825 {
2826 	int i, ret = 0;
2827 
2828 	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
2829 	for (i = 0; i < num; i++) {
2830 		snd_soc_dapm_del_route(dapm, route);
2831 		route++;
2832 	}
2833 	mutex_unlock(&dapm->card->dapm_mutex);
2834 
2835 	return ret;
2836 }
2837 EXPORT_SYMBOL_GPL(snd_soc_dapm_del_routes);
2838 
2839 static int snd_soc_dapm_weak_route(struct snd_soc_dapm_context *dapm,
2840 				   const struct snd_soc_dapm_route *route)
2841 {
2842 	struct snd_soc_dapm_widget *source = dapm_find_widget(dapm,
2843 							      route->source,
2844 							      true);
2845 	struct snd_soc_dapm_widget *sink = dapm_find_widget(dapm,
2846 							    route->sink,
2847 							    true);
2848 	struct snd_soc_dapm_path *path;
2849 	int count = 0;
2850 
2851 	if (!source) {
2852 		dev_err(dapm->dev, "ASoC: Unable to find source %s for weak route\n",
2853 			route->source);
2854 		return -ENODEV;
2855 	}
2856 
2857 	if (!sink) {
2858 		dev_err(dapm->dev, "ASoC: Unable to find sink %s for weak route\n",
2859 			route->sink);
2860 		return -ENODEV;
2861 	}
2862 
2863 	if (route->control || route->connected)
2864 		dev_warn(dapm->dev, "ASoC: Ignoring control for weak route %s->%s\n",
2865 			 route->source, route->sink);
2866 
2867 	list_for_each_entry(path, &source->sinks, list_source) {
2868 		if (path->sink == sink) {
2869 			path->weak = 1;
2870 			count++;
2871 		}
2872 	}
2873 
2874 	if (count == 0)
2875 		dev_err(dapm->dev, "ASoC: No path found for weak route %s->%s\n",
2876 			route->source, route->sink);
2877 	if (count > 1)
2878 		dev_warn(dapm->dev, "ASoC: %d paths found for weak route %s->%s\n",
2879 			 count, route->source, route->sink);
2880 
2881 	return 0;
2882 }
2883 
2884 /**
2885  * snd_soc_dapm_weak_routes - Mark routes between DAPM widgets as weak
2886  * @dapm: DAPM context
2887  * @route: audio routes
2888  * @num: number of routes
2889  *
2890  * Mark existing routes matching those specified in the passed array
2891  * as being weak, meaning that they are ignored for the purpose of
2892  * power decisions.  The main intended use case is for sidetone paths
2893  * which couple audio between other independent paths if they are both
2894  * active in order to make the combination work better at the user
2895  * level but which aren't intended to be "used".
2896  *
2897  * Note that CODEC drivers should not use this as sidetone type paths
2898  * can frequently also be used as bypass paths.
2899  */
2900 int snd_soc_dapm_weak_routes(struct snd_soc_dapm_context *dapm,
2901 			     const struct snd_soc_dapm_route *route, int num)
2902 {
2903 	int i, err;
2904 	int ret = 0;
2905 
2906 	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
2907 	for (i = 0; i < num; i++) {
2908 		err = snd_soc_dapm_weak_route(dapm, route);
2909 		if (err)
2910 			ret = err;
2911 		route++;
2912 	}
2913 	mutex_unlock(&dapm->card->dapm_mutex);
2914 
2915 	return ret;
2916 }
2917 EXPORT_SYMBOL_GPL(snd_soc_dapm_weak_routes);
2918 
2919 /**
2920  * snd_soc_dapm_new_widgets - add new dapm widgets
2921  * @dapm: DAPM context
2922  *
2923  * Checks the codec for any new dapm widgets and creates them if found.
2924  *
2925  * Returns 0 for success.
2926  */
2927 int snd_soc_dapm_new_widgets(struct snd_soc_card *card)
2928 {
2929 	struct snd_soc_dapm_widget *w;
2930 	unsigned int val;
2931 
2932 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
2933 
2934 	list_for_each_entry(w, &card->widgets, list)
2935 	{
2936 		if (w->new)
2937 			continue;
2938 
2939 		if (w->num_kcontrols) {
2940 			w->kcontrols = kzalloc(w->num_kcontrols *
2941 						sizeof(struct snd_kcontrol *),
2942 						GFP_KERNEL);
2943 			if (!w->kcontrols) {
2944 				mutex_unlock(&card->dapm_mutex);
2945 				return -ENOMEM;
2946 			}
2947 		}
2948 
2949 		switch(w->id) {
2950 		case snd_soc_dapm_switch:
2951 		case snd_soc_dapm_mixer:
2952 		case snd_soc_dapm_mixer_named_ctl:
2953 			dapm_new_mixer(w);
2954 			break;
2955 		case snd_soc_dapm_mux:
2956 		case snd_soc_dapm_demux:
2957 			dapm_new_mux(w);
2958 			break;
2959 		case snd_soc_dapm_pga:
2960 		case snd_soc_dapm_out_drv:
2961 			dapm_new_pga(w);
2962 			break;
2963 		case snd_soc_dapm_dai_link:
2964 			dapm_new_dai_link(w);
2965 			break;
2966 		default:
2967 			break;
2968 		}
2969 
2970 		/* Read the initial power state from the device */
2971 		if (w->reg >= 0) {
2972 			soc_dapm_read(w->dapm, w->reg, &val);
2973 			val = val >> w->shift;
2974 			val &= w->mask;
2975 			if (val == w->on_val)
2976 				w->power = 1;
2977 		}
2978 
2979 		w->new = 1;
2980 
2981 		dapm_mark_dirty(w, "new widget");
2982 		dapm_debugfs_add_widget(w);
2983 	}
2984 
2985 	dapm_power_widgets(card, SND_SOC_DAPM_STREAM_NOP);
2986 	mutex_unlock(&card->dapm_mutex);
2987 	return 0;
2988 }
2989 EXPORT_SYMBOL_GPL(snd_soc_dapm_new_widgets);
2990 
2991 /**
2992  * snd_soc_dapm_get_volsw - dapm mixer get callback
2993  * @kcontrol: mixer control
2994  * @ucontrol: control element information
2995  *
2996  * Callback to get the value of a dapm mixer control.
2997  *
2998  * Returns 0 for success.
2999  */
3000 int snd_soc_dapm_get_volsw(struct snd_kcontrol *kcontrol,
3001 	struct snd_ctl_elem_value *ucontrol)
3002 {
3003 	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
3004 	struct snd_soc_card *card = dapm->card;
3005 	struct soc_mixer_control *mc =
3006 		(struct soc_mixer_control *)kcontrol->private_value;
3007 	int reg = mc->reg;
3008 	unsigned int shift = mc->shift;
3009 	int max = mc->max;
3010 	unsigned int mask = (1 << fls(max)) - 1;
3011 	unsigned int invert = mc->invert;
3012 	unsigned int val;
3013 	int ret = 0;
3014 
3015 	if (snd_soc_volsw_is_stereo(mc))
3016 		dev_warn(dapm->dev,
3017 			 "ASoC: Control '%s' is stereo, which is not supported\n",
3018 			 kcontrol->id.name);
3019 
3020 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
3021 	if (dapm_kcontrol_is_powered(kcontrol) && reg != SND_SOC_NOPM) {
3022 		ret = soc_dapm_read(dapm, reg, &val);
3023 		val = (val >> shift) & mask;
3024 	} else {
3025 		val = dapm_kcontrol_get_value(kcontrol);
3026 	}
3027 	mutex_unlock(&card->dapm_mutex);
3028 
3029 	if (invert)
3030 		ucontrol->value.integer.value[0] = max - val;
3031 	else
3032 		ucontrol->value.integer.value[0] = val;
3033 
3034 	return ret;
3035 }
3036 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_volsw);
3037 
3038 /**
3039  * snd_soc_dapm_put_volsw - dapm mixer set callback
3040  * @kcontrol: mixer control
3041  * @ucontrol: control element information
3042  *
3043  * Callback to set the value of a dapm mixer control.
3044  *
3045  * Returns 0 for success.
3046  */
3047 int snd_soc_dapm_put_volsw(struct snd_kcontrol *kcontrol,
3048 	struct snd_ctl_elem_value *ucontrol)
3049 {
3050 	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
3051 	struct snd_soc_card *card = dapm->card;
3052 	struct soc_mixer_control *mc =
3053 		(struct soc_mixer_control *)kcontrol->private_value;
3054 	int reg = mc->reg;
3055 	unsigned int shift = mc->shift;
3056 	int max = mc->max;
3057 	unsigned int mask = (1 << fls(max)) - 1;
3058 	unsigned int invert = mc->invert;
3059 	unsigned int val;
3060 	int connect, change, reg_change = 0;
3061 	struct snd_soc_dapm_update update;
3062 	int ret = 0;
3063 
3064 	if (snd_soc_volsw_is_stereo(mc))
3065 		dev_warn(dapm->dev,
3066 			 "ASoC: Control '%s' is stereo, which is not supported\n",
3067 			 kcontrol->id.name);
3068 
3069 	val = (ucontrol->value.integer.value[0] & mask);
3070 	connect = !!val;
3071 
3072 	if (invert)
3073 		val = max - val;
3074 
3075 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
3076 
3077 	change = dapm_kcontrol_set_value(kcontrol, val);
3078 
3079 	if (reg != SND_SOC_NOPM) {
3080 		mask = mask << shift;
3081 		val = val << shift;
3082 
3083 		reg_change = soc_dapm_test_bits(dapm, reg, mask, val);
3084 	}
3085 
3086 	if (change || reg_change) {
3087 		if (reg_change) {
3088 			update.kcontrol = kcontrol;
3089 			update.reg = reg;
3090 			update.mask = mask;
3091 			update.val = val;
3092 			card->update = &update;
3093 		}
3094 		change |= reg_change;
3095 
3096 		ret = soc_dapm_mixer_update_power(card, kcontrol, connect);
3097 
3098 		card->update = NULL;
3099 	}
3100 
3101 	mutex_unlock(&card->dapm_mutex);
3102 
3103 	if (ret > 0)
3104 		soc_dpcm_runtime_update(card);
3105 
3106 	return change;
3107 }
3108 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_volsw);
3109 
3110 /**
3111  * snd_soc_dapm_get_enum_double - dapm enumerated double mixer get callback
3112  * @kcontrol: mixer control
3113  * @ucontrol: control element information
3114  *
3115  * Callback to get the value of a dapm enumerated double mixer control.
3116  *
3117  * Returns 0 for success.
3118  */
3119 int snd_soc_dapm_get_enum_double(struct snd_kcontrol *kcontrol,
3120 	struct snd_ctl_elem_value *ucontrol)
3121 {
3122 	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
3123 	struct snd_soc_card *card = dapm->card;
3124 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
3125 	unsigned int reg_val, val;
3126 
3127 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
3128 	if (e->reg != SND_SOC_NOPM && dapm_kcontrol_is_powered(kcontrol)) {
3129 		int ret = soc_dapm_read(dapm, e->reg, &reg_val);
3130 		if (ret) {
3131 			mutex_unlock(&card->dapm_mutex);
3132 			return ret;
3133 		}
3134 	} else {
3135 		reg_val = dapm_kcontrol_get_value(kcontrol);
3136 	}
3137 	mutex_unlock(&card->dapm_mutex);
3138 
3139 	val = (reg_val >> e->shift_l) & e->mask;
3140 	ucontrol->value.enumerated.item[0] = snd_soc_enum_val_to_item(e, val);
3141 	if (e->shift_l != e->shift_r) {
3142 		val = (reg_val >> e->shift_r) & e->mask;
3143 		val = snd_soc_enum_val_to_item(e, val);
3144 		ucontrol->value.enumerated.item[1] = val;
3145 	}
3146 
3147 	return 0;
3148 }
3149 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_enum_double);
3150 
3151 /**
3152  * snd_soc_dapm_put_enum_double - dapm enumerated double mixer set callback
3153  * @kcontrol: mixer control
3154  * @ucontrol: control element information
3155  *
3156  * Callback to set the value of a dapm enumerated double mixer control.
3157  *
3158  * Returns 0 for success.
3159  */
3160 int snd_soc_dapm_put_enum_double(struct snd_kcontrol *kcontrol,
3161 	struct snd_ctl_elem_value *ucontrol)
3162 {
3163 	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
3164 	struct snd_soc_card *card = dapm->card;
3165 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
3166 	unsigned int *item = ucontrol->value.enumerated.item;
3167 	unsigned int val, change, reg_change = 0;
3168 	unsigned int mask;
3169 	struct snd_soc_dapm_update update;
3170 	int ret = 0;
3171 
3172 	if (item[0] >= e->items)
3173 		return -EINVAL;
3174 
3175 	val = snd_soc_enum_item_to_val(e, item[0]) << e->shift_l;
3176 	mask = e->mask << e->shift_l;
3177 	if (e->shift_l != e->shift_r) {
3178 		if (item[1] > e->items)
3179 			return -EINVAL;
3180 		val |= snd_soc_enum_item_to_val(e, item[1]) << e->shift_l;
3181 		mask |= e->mask << e->shift_r;
3182 	}
3183 
3184 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
3185 
3186 	change = dapm_kcontrol_set_value(kcontrol, val);
3187 
3188 	if (e->reg != SND_SOC_NOPM)
3189 		reg_change = soc_dapm_test_bits(dapm, e->reg, mask, val);
3190 
3191 	if (change || reg_change) {
3192 		if (reg_change) {
3193 			update.kcontrol = kcontrol;
3194 			update.reg = e->reg;
3195 			update.mask = mask;
3196 			update.val = val;
3197 			card->update = &update;
3198 		}
3199 		change |= reg_change;
3200 
3201 		ret = soc_dapm_mux_update_power(card, kcontrol, item[0], e);
3202 
3203 		card->update = NULL;
3204 	}
3205 
3206 	mutex_unlock(&card->dapm_mutex);
3207 
3208 	if (ret > 0)
3209 		soc_dpcm_runtime_update(card);
3210 
3211 	return change;
3212 }
3213 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_enum_double);
3214 
3215 /**
3216  * snd_soc_dapm_info_pin_switch - Info for a pin switch
3217  *
3218  * @kcontrol: mixer control
3219  * @uinfo: control element information
3220  *
3221  * Callback to provide information about a pin switch control.
3222  */
3223 int snd_soc_dapm_info_pin_switch(struct snd_kcontrol *kcontrol,
3224 				 struct snd_ctl_elem_info *uinfo)
3225 {
3226 	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
3227 	uinfo->count = 1;
3228 	uinfo->value.integer.min = 0;
3229 	uinfo->value.integer.max = 1;
3230 
3231 	return 0;
3232 }
3233 EXPORT_SYMBOL_GPL(snd_soc_dapm_info_pin_switch);
3234 
3235 /**
3236  * snd_soc_dapm_get_pin_switch - Get information for a pin switch
3237  *
3238  * @kcontrol: mixer control
3239  * @ucontrol: Value
3240  */
3241 int snd_soc_dapm_get_pin_switch(struct snd_kcontrol *kcontrol,
3242 				struct snd_ctl_elem_value *ucontrol)
3243 {
3244 	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
3245 	const char *pin = (const char *)kcontrol->private_value;
3246 
3247 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
3248 
3249 	ucontrol->value.integer.value[0] =
3250 		snd_soc_dapm_get_pin_status(&card->dapm, pin);
3251 
3252 	mutex_unlock(&card->dapm_mutex);
3253 
3254 	return 0;
3255 }
3256 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_pin_switch);
3257 
3258 /**
3259  * snd_soc_dapm_put_pin_switch - Set information for a pin switch
3260  *
3261  * @kcontrol: mixer control
3262  * @ucontrol: Value
3263  */
3264 int snd_soc_dapm_put_pin_switch(struct snd_kcontrol *kcontrol,
3265 				struct snd_ctl_elem_value *ucontrol)
3266 {
3267 	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
3268 	const char *pin = (const char *)kcontrol->private_value;
3269 
3270 	if (ucontrol->value.integer.value[0])
3271 		snd_soc_dapm_enable_pin(&card->dapm, pin);
3272 	else
3273 		snd_soc_dapm_disable_pin(&card->dapm, pin);
3274 
3275 	snd_soc_dapm_sync(&card->dapm);
3276 	return 0;
3277 }
3278 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_pin_switch);
3279 
3280 struct snd_soc_dapm_widget *
3281 snd_soc_dapm_new_control(struct snd_soc_dapm_context *dapm,
3282 	const struct snd_soc_dapm_widget *widget)
3283 {
3284 	struct snd_soc_dapm_widget *w;
3285 
3286 	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
3287 	w = snd_soc_dapm_new_control_unlocked(dapm, widget);
3288 	if (!w)
3289 		dev_err(dapm->dev,
3290 			"ASoC: Failed to create DAPM control %s\n",
3291 			widget->name);
3292 
3293 	mutex_unlock(&dapm->card->dapm_mutex);
3294 	return w;
3295 }
3296 
3297 struct snd_soc_dapm_widget *
3298 snd_soc_dapm_new_control_unlocked(struct snd_soc_dapm_context *dapm,
3299 			 const struct snd_soc_dapm_widget *widget)
3300 {
3301 	struct snd_soc_dapm_widget *w;
3302 	const char *prefix;
3303 	int ret;
3304 
3305 	if ((w = dapm_cnew_widget(widget)) == NULL)
3306 		return NULL;
3307 
3308 	switch (w->id) {
3309 	case snd_soc_dapm_regulator_supply:
3310 		w->regulator = devm_regulator_get(dapm->dev, w->name);
3311 		if (IS_ERR(w->regulator)) {
3312 			ret = PTR_ERR(w->regulator);
3313 			dev_err(dapm->dev, "ASoC: Failed to request %s: %d\n",
3314 				w->name, ret);
3315 			return NULL;
3316 		}
3317 
3318 		if (w->on_val & SND_SOC_DAPM_REGULATOR_BYPASS) {
3319 			ret = regulator_allow_bypass(w->regulator, true);
3320 			if (ret != 0)
3321 				dev_warn(w->dapm->dev,
3322 					 "ASoC: Failed to bypass %s: %d\n",
3323 					 w->name, ret);
3324 		}
3325 		break;
3326 	case snd_soc_dapm_clock_supply:
3327 #ifdef CONFIG_CLKDEV_LOOKUP
3328 		w->clk = devm_clk_get(dapm->dev, w->name);
3329 		if (IS_ERR(w->clk)) {
3330 			ret = PTR_ERR(w->clk);
3331 			dev_err(dapm->dev, "ASoC: Failed to request %s: %d\n",
3332 				w->name, ret);
3333 			return NULL;
3334 		}
3335 #else
3336 		return NULL;
3337 #endif
3338 		break;
3339 	default:
3340 		break;
3341 	}
3342 
3343 	prefix = soc_dapm_prefix(dapm);
3344 	if (prefix)
3345 		w->name = kasprintf(GFP_KERNEL, "%s %s", prefix, widget->name);
3346 	else
3347 		w->name = kasprintf(GFP_KERNEL, "%s", widget->name);
3348 	if (w->name == NULL) {
3349 		kfree(w);
3350 		return NULL;
3351 	}
3352 
3353 	switch (w->id) {
3354 	case snd_soc_dapm_mic:
3355 		w->is_source = 1;
3356 		w->power_check = dapm_generic_check_power;
3357 		break;
3358 	case snd_soc_dapm_input:
3359 		if (!dapm->card->fully_routed)
3360 			w->is_source = 1;
3361 		w->power_check = dapm_generic_check_power;
3362 		break;
3363 	case snd_soc_dapm_spk:
3364 	case snd_soc_dapm_hp:
3365 		w->is_sink = 1;
3366 		w->power_check = dapm_generic_check_power;
3367 		break;
3368 	case snd_soc_dapm_output:
3369 		if (!dapm->card->fully_routed)
3370 			w->is_sink = 1;
3371 		w->power_check = dapm_generic_check_power;
3372 		break;
3373 	case snd_soc_dapm_vmid:
3374 	case snd_soc_dapm_siggen:
3375 		w->is_source = 1;
3376 		w->power_check = dapm_always_on_check_power;
3377 		break;
3378 	case snd_soc_dapm_mux:
3379 	case snd_soc_dapm_demux:
3380 	case snd_soc_dapm_switch:
3381 	case snd_soc_dapm_mixer:
3382 	case snd_soc_dapm_mixer_named_ctl:
3383 	case snd_soc_dapm_adc:
3384 	case snd_soc_dapm_aif_out:
3385 	case snd_soc_dapm_dac:
3386 	case snd_soc_dapm_aif_in:
3387 	case snd_soc_dapm_pga:
3388 	case snd_soc_dapm_out_drv:
3389 	case snd_soc_dapm_micbias:
3390 	case snd_soc_dapm_line:
3391 	case snd_soc_dapm_dai_link:
3392 	case snd_soc_dapm_dai_out:
3393 	case snd_soc_dapm_dai_in:
3394 		w->power_check = dapm_generic_check_power;
3395 		break;
3396 	case snd_soc_dapm_supply:
3397 	case snd_soc_dapm_regulator_supply:
3398 	case snd_soc_dapm_clock_supply:
3399 	case snd_soc_dapm_kcontrol:
3400 		w->is_supply = 1;
3401 		w->power_check = dapm_supply_check_power;
3402 		break;
3403 	default:
3404 		w->power_check = dapm_always_on_check_power;
3405 		break;
3406 	}
3407 
3408 	w->dapm = dapm;
3409 	INIT_LIST_HEAD(&w->sources);
3410 	INIT_LIST_HEAD(&w->sinks);
3411 	INIT_LIST_HEAD(&w->list);
3412 	INIT_LIST_HEAD(&w->dirty);
3413 	list_add_tail(&w->list, &dapm->card->widgets);
3414 
3415 	w->inputs = -1;
3416 	w->outputs = -1;
3417 
3418 	/* machine layer set ups unconnected pins and insertions */
3419 	w->connected = 1;
3420 	return w;
3421 }
3422 
3423 /**
3424  * snd_soc_dapm_new_controls - create new dapm controls
3425  * @dapm: DAPM context
3426  * @widget: widget array
3427  * @num: number of widgets
3428  *
3429  * Creates new DAPM controls based upon the templates.
3430  *
3431  * Returns 0 for success else error.
3432  */
3433 int snd_soc_dapm_new_controls(struct snd_soc_dapm_context *dapm,
3434 	const struct snd_soc_dapm_widget *widget,
3435 	int num)
3436 {
3437 	struct snd_soc_dapm_widget *w;
3438 	int i;
3439 	int ret = 0;
3440 
3441 	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
3442 	for (i = 0; i < num; i++) {
3443 		w = snd_soc_dapm_new_control_unlocked(dapm, widget);
3444 		if (!w) {
3445 			dev_err(dapm->dev,
3446 				"ASoC: Failed to create DAPM control %s\n",
3447 				widget->name);
3448 			ret = -ENOMEM;
3449 			break;
3450 		}
3451 		widget++;
3452 	}
3453 	mutex_unlock(&dapm->card->dapm_mutex);
3454 	return ret;
3455 }
3456 EXPORT_SYMBOL_GPL(snd_soc_dapm_new_controls);
3457 
3458 static int snd_soc_dai_link_event(struct snd_soc_dapm_widget *w,
3459 				  struct snd_kcontrol *kcontrol, int event)
3460 {
3461 	struct snd_soc_dapm_path *source_p, *sink_p;
3462 	struct snd_soc_dai *source, *sink;
3463 	const struct snd_soc_pcm_stream *config = w->params + w->params_select;
3464 	struct snd_pcm_substream substream;
3465 	struct snd_pcm_hw_params *params = NULL;
3466 	u64 fmt;
3467 	int ret;
3468 
3469 	if (WARN_ON(!config) ||
3470 	    WARN_ON(list_empty(&w->sources) || list_empty(&w->sinks)))
3471 		return -EINVAL;
3472 
3473 	/* We only support a single source and sink, pick the first */
3474 	source_p = list_first_entry(&w->sources, struct snd_soc_dapm_path,
3475 				    list_sink);
3476 	sink_p = list_first_entry(&w->sinks, struct snd_soc_dapm_path,
3477 				  list_source);
3478 
3479 	if (WARN_ON(!source_p || !sink_p) ||
3480 	    WARN_ON(!sink_p->source || !source_p->sink) ||
3481 	    WARN_ON(!source_p->source || !sink_p->sink))
3482 		return -EINVAL;
3483 
3484 	source = source_p->source->priv;
3485 	sink = sink_p->sink->priv;
3486 
3487 	/* Be a little careful as we don't want to overflow the mask array */
3488 	if (config->formats) {
3489 		fmt = ffs(config->formats) - 1;
3490 	} else {
3491 		dev_warn(w->dapm->dev, "ASoC: Invalid format %llx specified\n",
3492 			 config->formats);
3493 		fmt = 0;
3494 	}
3495 
3496 	/* Currently very limited parameter selection */
3497 	params = kzalloc(sizeof(*params), GFP_KERNEL);
3498 	if (!params) {
3499 		ret = -ENOMEM;
3500 		goto out;
3501 	}
3502 	snd_mask_set(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), fmt);
3503 
3504 	hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE)->min =
3505 		config->rate_min;
3506 	hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE)->max =
3507 		config->rate_max;
3508 
3509 	hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS)->min
3510 		= config->channels_min;
3511 	hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS)->max
3512 		= config->channels_max;
3513 
3514 	memset(&substream, 0, sizeof(substream));
3515 
3516 	switch (event) {
3517 	case SND_SOC_DAPM_PRE_PMU:
3518 		substream.stream = SNDRV_PCM_STREAM_CAPTURE;
3519 		ret = soc_dai_hw_params(&substream, params, source);
3520 		if (ret < 0)
3521 			goto out;
3522 
3523 		substream.stream = SNDRV_PCM_STREAM_PLAYBACK;
3524 		ret = soc_dai_hw_params(&substream, params, sink);
3525 		if (ret < 0)
3526 			goto out;
3527 		break;
3528 
3529 	case SND_SOC_DAPM_POST_PMU:
3530 		ret = snd_soc_dai_digital_mute(sink, 0,
3531 					       SNDRV_PCM_STREAM_PLAYBACK);
3532 		if (ret != 0 && ret != -ENOTSUPP)
3533 			dev_warn(sink->dev, "ASoC: Failed to unmute: %d\n", ret);
3534 		ret = 0;
3535 		break;
3536 
3537 	case SND_SOC_DAPM_PRE_PMD:
3538 		ret = snd_soc_dai_digital_mute(sink, 1,
3539 					       SNDRV_PCM_STREAM_PLAYBACK);
3540 		if (ret != 0 && ret != -ENOTSUPP)
3541 			dev_warn(sink->dev, "ASoC: Failed to mute: %d\n", ret);
3542 		ret = 0;
3543 		break;
3544 
3545 	default:
3546 		WARN(1, "Unknown event %d\n", event);
3547 		return -EINVAL;
3548 	}
3549 
3550 out:
3551 	kfree(params);
3552 	return ret;
3553 }
3554 
3555 static int snd_soc_dapm_dai_link_get(struct snd_kcontrol *kcontrol,
3556 			  struct snd_ctl_elem_value *ucontrol)
3557 {
3558 	struct snd_soc_dapm_widget *w = snd_kcontrol_chip(kcontrol);
3559 
3560 	ucontrol->value.integer.value[0] = w->params_select;
3561 
3562 	return 0;
3563 }
3564 
3565 static int snd_soc_dapm_dai_link_put(struct snd_kcontrol *kcontrol,
3566 			  struct snd_ctl_elem_value *ucontrol)
3567 {
3568 	struct snd_soc_dapm_widget *w = snd_kcontrol_chip(kcontrol);
3569 
3570 	/* Can't change the config when widget is already powered */
3571 	if (w->power)
3572 		return -EBUSY;
3573 
3574 	if (ucontrol->value.integer.value[0] == w->params_select)
3575 		return 0;
3576 
3577 	if (ucontrol->value.integer.value[0] >= w->num_params)
3578 		return -EINVAL;
3579 
3580 	w->params_select = ucontrol->value.integer.value[0];
3581 
3582 	return 0;
3583 }
3584 
3585 int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
3586 			 const struct snd_soc_pcm_stream *params,
3587 			 unsigned int num_params,
3588 			 struct snd_soc_dapm_widget *source,
3589 			 struct snd_soc_dapm_widget *sink)
3590 {
3591 	struct snd_soc_dapm_widget template;
3592 	struct snd_soc_dapm_widget *w;
3593 	char *link_name;
3594 	int ret, count;
3595 	unsigned long private_value;
3596 	const char **w_param_text;
3597 	struct soc_enum w_param_enum[] = {
3598 		SOC_ENUM_SINGLE(0, 0, 0, NULL),
3599 	};
3600 	struct snd_kcontrol_new kcontrol_dai_link[] = {
3601 		SOC_ENUM_EXT(NULL, w_param_enum[0],
3602 			     snd_soc_dapm_dai_link_get,
3603 			     snd_soc_dapm_dai_link_put),
3604 	};
3605 	const struct snd_soc_pcm_stream *config = params;
3606 
3607 	w_param_text = devm_kcalloc(card->dev, num_params,
3608 					sizeof(char *), GFP_KERNEL);
3609 	if (!w_param_text)
3610 		return -ENOMEM;
3611 
3612 	link_name = devm_kasprintf(card->dev, GFP_KERNEL, "%s-%s",
3613 				   source->name, sink->name);
3614 	if (!link_name) {
3615 		ret = -ENOMEM;
3616 		goto outfree_w_param;
3617 	}
3618 
3619 	for (count = 0 ; count < num_params; count++) {
3620 		if (!config->stream_name) {
3621 			dev_warn(card->dapm.dev,
3622 				"ASoC: anonymous config %d for dai link %s\n",
3623 				count, link_name);
3624 			w_param_text[count] =
3625 				devm_kasprintf(card->dev, GFP_KERNEL,
3626 					       "Anonymous Configuration %d",
3627 					       count);
3628 			if (!w_param_text[count]) {
3629 				ret = -ENOMEM;
3630 				goto outfree_link_name;
3631 			}
3632 		} else {
3633 			w_param_text[count] = devm_kmemdup(card->dev,
3634 						config->stream_name,
3635 						strlen(config->stream_name) + 1,
3636 						GFP_KERNEL);
3637 			if (!w_param_text[count]) {
3638 				ret = -ENOMEM;
3639 				goto outfree_link_name;
3640 			}
3641 		}
3642 		config++;
3643 	}
3644 	w_param_enum[0].items = num_params;
3645 	w_param_enum[0].texts = w_param_text;
3646 
3647 	memset(&template, 0, sizeof(template));
3648 	template.reg = SND_SOC_NOPM;
3649 	template.id = snd_soc_dapm_dai_link;
3650 	template.name = link_name;
3651 	template.event = snd_soc_dai_link_event;
3652 	template.event_flags = SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMU |
3653 		SND_SOC_DAPM_PRE_PMD;
3654 	template.num_kcontrols = 1;
3655 	/* duplicate w_param_enum on heap so that memory persists */
3656 	private_value =
3657 		(unsigned long) devm_kmemdup(card->dev,
3658 			(void *)(kcontrol_dai_link[0].private_value),
3659 			sizeof(struct soc_enum), GFP_KERNEL);
3660 	if (!private_value) {
3661 		dev_err(card->dev, "ASoC: Failed to create control for %s widget\n",
3662 			link_name);
3663 		ret = -ENOMEM;
3664 		goto outfree_link_name;
3665 	}
3666 	kcontrol_dai_link[0].private_value = private_value;
3667 	/* duplicate kcontrol_dai_link on heap so that memory persists */
3668 	template.kcontrol_news =
3669 				devm_kmemdup(card->dev, &kcontrol_dai_link[0],
3670 					sizeof(struct snd_kcontrol_new),
3671 					GFP_KERNEL);
3672 	if (!template.kcontrol_news) {
3673 		dev_err(card->dev, "ASoC: Failed to create control for %s widget\n",
3674 			link_name);
3675 		ret = -ENOMEM;
3676 		goto outfree_private_value;
3677 	}
3678 
3679 	dev_dbg(card->dev, "ASoC: adding %s widget\n", link_name);
3680 
3681 	w = snd_soc_dapm_new_control_unlocked(&card->dapm, &template);
3682 	if (!w) {
3683 		dev_err(card->dev, "ASoC: Failed to create %s widget\n",
3684 			link_name);
3685 		ret = -ENOMEM;
3686 		goto outfree_kcontrol_news;
3687 	}
3688 
3689 	w->params = params;
3690 	w->num_params = num_params;
3691 
3692 	ret = snd_soc_dapm_add_path(&card->dapm, source, w, NULL, NULL);
3693 	if (ret)
3694 		goto outfree_w;
3695 	return snd_soc_dapm_add_path(&card->dapm, w, sink, NULL, NULL);
3696 
3697 outfree_w:
3698 	devm_kfree(card->dev, w);
3699 outfree_kcontrol_news:
3700 	devm_kfree(card->dev, (void *)template.kcontrol_news);
3701 outfree_private_value:
3702 	devm_kfree(card->dev, (void *)private_value);
3703 outfree_link_name:
3704 	devm_kfree(card->dev, link_name);
3705 outfree_w_param:
3706 	for (count = 0 ; count < num_params; count++)
3707 		devm_kfree(card->dev, (void *)w_param_text[count]);
3708 	devm_kfree(card->dev, w_param_text);
3709 
3710 	return ret;
3711 }
3712 
3713 int snd_soc_dapm_new_dai_widgets(struct snd_soc_dapm_context *dapm,
3714 				 struct snd_soc_dai *dai)
3715 {
3716 	struct snd_soc_dapm_widget template;
3717 	struct snd_soc_dapm_widget *w;
3718 
3719 	WARN_ON(dapm->dev != dai->dev);
3720 
3721 	memset(&template, 0, sizeof(template));
3722 	template.reg = SND_SOC_NOPM;
3723 
3724 	if (dai->driver->playback.stream_name) {
3725 		template.id = snd_soc_dapm_dai_in;
3726 		template.name = dai->driver->playback.stream_name;
3727 		template.sname = dai->driver->playback.stream_name;
3728 
3729 		dev_dbg(dai->dev, "ASoC: adding %s widget\n",
3730 			template.name);
3731 
3732 		w = snd_soc_dapm_new_control_unlocked(dapm, &template);
3733 		if (!w) {
3734 			dev_err(dapm->dev, "ASoC: Failed to create %s widget\n",
3735 				dai->driver->playback.stream_name);
3736 			return -ENOMEM;
3737 		}
3738 
3739 		w->priv = dai;
3740 		dai->playback_widget = w;
3741 	}
3742 
3743 	if (dai->driver->capture.stream_name) {
3744 		template.id = snd_soc_dapm_dai_out;
3745 		template.name = dai->driver->capture.stream_name;
3746 		template.sname = dai->driver->capture.stream_name;
3747 
3748 		dev_dbg(dai->dev, "ASoC: adding %s widget\n",
3749 			template.name);
3750 
3751 		w = snd_soc_dapm_new_control_unlocked(dapm, &template);
3752 		if (!w) {
3753 			dev_err(dapm->dev, "ASoC: Failed to create %s widget\n",
3754 				dai->driver->capture.stream_name);
3755 			return -ENOMEM;
3756 		}
3757 
3758 		w->priv = dai;
3759 		dai->capture_widget = w;
3760 	}
3761 
3762 	return 0;
3763 }
3764 
3765 int snd_soc_dapm_link_dai_widgets(struct snd_soc_card *card)
3766 {
3767 	struct snd_soc_dapm_widget *dai_w, *w;
3768 	struct snd_soc_dapm_widget *src, *sink;
3769 	struct snd_soc_dai *dai;
3770 
3771 	/* For each DAI widget... */
3772 	list_for_each_entry(dai_w, &card->widgets, list) {
3773 		switch (dai_w->id) {
3774 		case snd_soc_dapm_dai_in:
3775 		case snd_soc_dapm_dai_out:
3776 			break;
3777 		default:
3778 			continue;
3779 		}
3780 
3781 		dai = dai_w->priv;
3782 
3783 		/* ...find all widgets with the same stream and link them */
3784 		list_for_each_entry(w, &card->widgets, list) {
3785 			if (w->dapm != dai_w->dapm)
3786 				continue;
3787 
3788 			switch (w->id) {
3789 			case snd_soc_dapm_dai_in:
3790 			case snd_soc_dapm_dai_out:
3791 				continue;
3792 			default:
3793 				break;
3794 			}
3795 
3796 			if (!w->sname || !strstr(w->sname, dai_w->sname))
3797 				continue;
3798 
3799 			if (dai_w->id == snd_soc_dapm_dai_in) {
3800 				src = dai_w;
3801 				sink = w;
3802 			} else {
3803 				src = w;
3804 				sink = dai_w;
3805 			}
3806 			dev_dbg(dai->dev, "%s -> %s\n", src->name, sink->name);
3807 			snd_soc_dapm_add_path(w->dapm, src, sink, NULL, NULL);
3808 		}
3809 	}
3810 
3811 	return 0;
3812 }
3813 
3814 static void dapm_connect_dai_link_widgets(struct snd_soc_card *card,
3815 					  struct snd_soc_pcm_runtime *rtd)
3816 {
3817 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
3818 	struct snd_soc_dapm_widget *sink, *source;
3819 	int i;
3820 
3821 	for (i = 0; i < rtd->num_codecs; i++) {
3822 		struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
3823 
3824 		/* there is no point in connecting BE DAI links with dummies */
3825 		if (snd_soc_dai_is_dummy(codec_dai) ||
3826 			snd_soc_dai_is_dummy(cpu_dai))
3827 			continue;
3828 
3829 		/* connect BE DAI playback if widgets are valid */
3830 		if (codec_dai->playback_widget && cpu_dai->playback_widget) {
3831 			source = cpu_dai->playback_widget;
3832 			sink = codec_dai->playback_widget;
3833 			dev_dbg(rtd->dev, "connected DAI link %s:%s -> %s:%s\n",
3834 				cpu_dai->component->name, source->name,
3835 				codec_dai->component->name, sink->name);
3836 
3837 			snd_soc_dapm_add_path(&card->dapm, source, sink,
3838 				NULL, NULL);
3839 		}
3840 
3841 		/* connect BE DAI capture if widgets are valid */
3842 		if (codec_dai->capture_widget && cpu_dai->capture_widget) {
3843 			source = codec_dai->capture_widget;
3844 			sink = cpu_dai->capture_widget;
3845 			dev_dbg(rtd->dev, "connected DAI link %s:%s -> %s:%s\n",
3846 				codec_dai->component->name, source->name,
3847 				cpu_dai->component->name, sink->name);
3848 
3849 			snd_soc_dapm_add_path(&card->dapm, source, sink,
3850 				NULL, NULL);
3851 		}
3852 	}
3853 }
3854 
3855 static void soc_dapm_dai_stream_event(struct snd_soc_dai *dai, int stream,
3856 	int event)
3857 {
3858 	struct snd_soc_dapm_widget *w;
3859 
3860 	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
3861 		w = dai->playback_widget;
3862 	else
3863 		w = dai->capture_widget;
3864 
3865 	if (w) {
3866 		dapm_mark_dirty(w, "stream event");
3867 
3868 		switch (event) {
3869 		case SND_SOC_DAPM_STREAM_START:
3870 			w->active = 1;
3871 			break;
3872 		case SND_SOC_DAPM_STREAM_STOP:
3873 			w->active = 0;
3874 			break;
3875 		case SND_SOC_DAPM_STREAM_SUSPEND:
3876 		case SND_SOC_DAPM_STREAM_RESUME:
3877 		case SND_SOC_DAPM_STREAM_PAUSE_PUSH:
3878 		case SND_SOC_DAPM_STREAM_PAUSE_RELEASE:
3879 			break;
3880 		}
3881 
3882 		if (w->id == snd_soc_dapm_dai_in) {
3883 			w->is_source = w->active;
3884 			dapm_widget_invalidate_input_paths(w);
3885 		} else {
3886 			w->is_sink = w->active;
3887 			dapm_widget_invalidate_output_paths(w);
3888 		}
3889 	}
3890 }
3891 
3892 void snd_soc_dapm_connect_dai_link_widgets(struct snd_soc_card *card)
3893 {
3894 	struct snd_soc_pcm_runtime *rtd = card->rtd;
3895 	int i;
3896 
3897 	/* for each BE DAI link... */
3898 	for (i = 0; i < card->num_rtd; i++) {
3899 		rtd = &card->rtd[i];
3900 
3901 		/*
3902 		 * dynamic FE links have no fixed DAI mapping.
3903 		 * CODEC<->CODEC links have no direct connection.
3904 		 */
3905 		if (rtd->dai_link->dynamic || rtd->dai_link->params)
3906 			continue;
3907 
3908 		dapm_connect_dai_link_widgets(card, rtd);
3909 	}
3910 }
3911 
3912 static void soc_dapm_stream_event(struct snd_soc_pcm_runtime *rtd, int stream,
3913 	int event)
3914 {
3915 	int i;
3916 
3917 	soc_dapm_dai_stream_event(rtd->cpu_dai, stream, event);
3918 	for (i = 0; i < rtd->num_codecs; i++)
3919 		soc_dapm_dai_stream_event(rtd->codec_dais[i], stream, event);
3920 
3921 	dapm_power_widgets(rtd->card, event);
3922 }
3923 
3924 /**
3925  * snd_soc_dapm_stream_event - send a stream event to the dapm core
3926  * @rtd: PCM runtime data
3927  * @stream: stream name
3928  * @event: stream event
3929  *
3930  * Sends a stream event to the dapm core. The core then makes any
3931  * necessary widget power changes.
3932  *
3933  * Returns 0 for success else error.
3934  */
3935 void snd_soc_dapm_stream_event(struct snd_soc_pcm_runtime *rtd, int stream,
3936 			      int event)
3937 {
3938 	struct snd_soc_card *card = rtd->card;
3939 
3940 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
3941 	soc_dapm_stream_event(rtd, stream, event);
3942 	mutex_unlock(&card->dapm_mutex);
3943 }
3944 
3945 /**
3946  * snd_soc_dapm_enable_pin_unlocked - enable pin.
3947  * @dapm: DAPM context
3948  * @pin: pin name
3949  *
3950  * Enables input/output pin and its parents or children widgets iff there is
3951  * a valid audio route and active audio stream.
3952  *
3953  * Requires external locking.
3954  *
3955  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
3956  * do any widget power switching.
3957  */
3958 int snd_soc_dapm_enable_pin_unlocked(struct snd_soc_dapm_context *dapm,
3959 				   const char *pin)
3960 {
3961 	return snd_soc_dapm_set_pin(dapm, pin, 1);
3962 }
3963 EXPORT_SYMBOL_GPL(snd_soc_dapm_enable_pin_unlocked);
3964 
3965 /**
3966  * snd_soc_dapm_enable_pin - enable pin.
3967  * @dapm: DAPM context
3968  * @pin: pin name
3969  *
3970  * Enables input/output pin and its parents or children widgets iff there is
3971  * a valid audio route and active audio stream.
3972  *
3973  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
3974  * do any widget power switching.
3975  */
3976 int snd_soc_dapm_enable_pin(struct snd_soc_dapm_context *dapm, const char *pin)
3977 {
3978 	int ret;
3979 
3980 	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
3981 
3982 	ret = snd_soc_dapm_set_pin(dapm, pin, 1);
3983 
3984 	mutex_unlock(&dapm->card->dapm_mutex);
3985 
3986 	return ret;
3987 }
3988 EXPORT_SYMBOL_GPL(snd_soc_dapm_enable_pin);
3989 
3990 /**
3991  * snd_soc_dapm_force_enable_pin_unlocked - force a pin to be enabled
3992  * @dapm: DAPM context
3993  * @pin: pin name
3994  *
3995  * Enables input/output pin regardless of any other state.  This is
3996  * intended for use with microphone bias supplies used in microphone
3997  * jack detection.
3998  *
3999  * Requires external locking.
4000  *
4001  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
4002  * do any widget power switching.
4003  */
4004 int snd_soc_dapm_force_enable_pin_unlocked(struct snd_soc_dapm_context *dapm,
4005 					 const char *pin)
4006 {
4007 	struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);
4008 
4009 	if (!w) {
4010 		dev_err(dapm->dev, "ASoC: unknown pin %s\n", pin);
4011 		return -EINVAL;
4012 	}
4013 
4014 	dev_dbg(w->dapm->dev, "ASoC: force enable pin %s\n", pin);
4015 	if (!w->connected) {
4016 		/*
4017 		 * w->force does not affect the number of input or output paths,
4018 		 * so we only have to recheck if w->connected is changed
4019 		 */
4020 		dapm_widget_invalidate_input_paths(w);
4021 		dapm_widget_invalidate_output_paths(w);
4022 		w->connected = 1;
4023 	}
4024 	w->force = 1;
4025 	dapm_mark_dirty(w, "force enable");
4026 
4027 	return 0;
4028 }
4029 EXPORT_SYMBOL_GPL(snd_soc_dapm_force_enable_pin_unlocked);
4030 
4031 /**
4032  * snd_soc_dapm_force_enable_pin - force a pin to be enabled
4033  * @dapm: DAPM context
4034  * @pin: pin name
4035  *
4036  * Enables input/output pin regardless of any other state.  This is
4037  * intended for use with microphone bias supplies used in microphone
4038  * jack detection.
4039  *
4040  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
4041  * do any widget power switching.
4042  */
4043 int snd_soc_dapm_force_enable_pin(struct snd_soc_dapm_context *dapm,
4044 				  const char *pin)
4045 {
4046 	int ret;
4047 
4048 	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
4049 
4050 	ret = snd_soc_dapm_force_enable_pin_unlocked(dapm, pin);
4051 
4052 	mutex_unlock(&dapm->card->dapm_mutex);
4053 
4054 	return ret;
4055 }
4056 EXPORT_SYMBOL_GPL(snd_soc_dapm_force_enable_pin);
4057 
4058 /**
4059  * snd_soc_dapm_disable_pin_unlocked - disable pin.
4060  * @dapm: DAPM context
4061  * @pin: pin name
4062  *
4063  * Disables input/output pin and its parents or children widgets.
4064  *
4065  * Requires external locking.
4066  *
4067  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
4068  * do any widget power switching.
4069  */
4070 int snd_soc_dapm_disable_pin_unlocked(struct snd_soc_dapm_context *dapm,
4071 				    const char *pin)
4072 {
4073 	return snd_soc_dapm_set_pin(dapm, pin, 0);
4074 }
4075 EXPORT_SYMBOL_GPL(snd_soc_dapm_disable_pin_unlocked);
4076 
4077 /**
4078  * snd_soc_dapm_disable_pin - disable pin.
4079  * @dapm: DAPM context
4080  * @pin: pin name
4081  *
4082  * Disables input/output pin and its parents or children widgets.
4083  *
4084  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
4085  * do any widget power switching.
4086  */
4087 int snd_soc_dapm_disable_pin(struct snd_soc_dapm_context *dapm,
4088 			     const char *pin)
4089 {
4090 	int ret;
4091 
4092 	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
4093 
4094 	ret = snd_soc_dapm_set_pin(dapm, pin, 0);
4095 
4096 	mutex_unlock(&dapm->card->dapm_mutex);
4097 
4098 	return ret;
4099 }
4100 EXPORT_SYMBOL_GPL(snd_soc_dapm_disable_pin);
4101 
4102 /**
4103  * snd_soc_dapm_nc_pin_unlocked - permanently disable pin.
4104  * @dapm: DAPM context
4105  * @pin: pin name
4106  *
4107  * Marks the specified pin as being not connected, disabling it along
4108  * any parent or child widgets.  At present this is identical to
4109  * snd_soc_dapm_disable_pin() but in future it will be extended to do
4110  * additional things such as disabling controls which only affect
4111  * paths through the pin.
4112  *
4113  * Requires external locking.
4114  *
4115  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
4116  * do any widget power switching.
4117  */
4118 int snd_soc_dapm_nc_pin_unlocked(struct snd_soc_dapm_context *dapm,
4119 			       const char *pin)
4120 {
4121 	return snd_soc_dapm_set_pin(dapm, pin, 0);
4122 }
4123 EXPORT_SYMBOL_GPL(snd_soc_dapm_nc_pin_unlocked);
4124 
4125 /**
4126  * snd_soc_dapm_nc_pin - permanently disable pin.
4127  * @dapm: DAPM context
4128  * @pin: pin name
4129  *
4130  * Marks the specified pin as being not connected, disabling it along
4131  * any parent or child widgets.  At present this is identical to
4132  * snd_soc_dapm_disable_pin() but in future it will be extended to do
4133  * additional things such as disabling controls which only affect
4134  * paths through the pin.
4135  *
4136  * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
4137  * do any widget power switching.
4138  */
4139 int snd_soc_dapm_nc_pin(struct snd_soc_dapm_context *dapm, const char *pin)
4140 {
4141 	int ret;
4142 
4143 	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
4144 
4145 	ret = snd_soc_dapm_set_pin(dapm, pin, 0);
4146 
4147 	mutex_unlock(&dapm->card->dapm_mutex);
4148 
4149 	return ret;
4150 }
4151 EXPORT_SYMBOL_GPL(snd_soc_dapm_nc_pin);
4152 
4153 /**
4154  * snd_soc_dapm_get_pin_status - get audio pin status
4155  * @dapm: DAPM context
4156  * @pin: audio signal pin endpoint (or start point)
4157  *
4158  * Get audio pin status - connected or disconnected.
4159  *
4160  * Returns 1 for connected otherwise 0.
4161  */
4162 int snd_soc_dapm_get_pin_status(struct snd_soc_dapm_context *dapm,
4163 				const char *pin)
4164 {
4165 	struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);
4166 
4167 	if (w)
4168 		return w->connected;
4169 
4170 	return 0;
4171 }
4172 EXPORT_SYMBOL_GPL(snd_soc_dapm_get_pin_status);
4173 
4174 /**
4175  * snd_soc_dapm_ignore_suspend - ignore suspend status for DAPM endpoint
4176  * @dapm: DAPM context
4177  * @pin: audio signal pin endpoint (or start point)
4178  *
4179  * Mark the given endpoint or pin as ignoring suspend.  When the
4180  * system is disabled a path between two endpoints flagged as ignoring
4181  * suspend will not be disabled.  The path must already be enabled via
4182  * normal means at suspend time, it will not be turned on if it was not
4183  * already enabled.
4184  */
4185 int snd_soc_dapm_ignore_suspend(struct snd_soc_dapm_context *dapm,
4186 				const char *pin)
4187 {
4188 	struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, false);
4189 
4190 	if (!w) {
4191 		dev_err(dapm->dev, "ASoC: unknown pin %s\n", pin);
4192 		return -EINVAL;
4193 	}
4194 
4195 	w->ignore_suspend = 1;
4196 
4197 	return 0;
4198 }
4199 EXPORT_SYMBOL_GPL(snd_soc_dapm_ignore_suspend);
4200 
4201 /**
4202  * snd_soc_dapm_free - free dapm resources
4203  * @dapm: DAPM context
4204  *
4205  * Free all dapm widgets and resources.
4206  */
4207 void snd_soc_dapm_free(struct snd_soc_dapm_context *dapm)
4208 {
4209 	dapm_debugfs_cleanup(dapm);
4210 	dapm_free_widgets(dapm);
4211 	list_del(&dapm->list);
4212 }
4213 EXPORT_SYMBOL_GPL(snd_soc_dapm_free);
4214 
4215 static void soc_dapm_shutdown_dapm(struct snd_soc_dapm_context *dapm)
4216 {
4217 	struct snd_soc_card *card = dapm->card;
4218 	struct snd_soc_dapm_widget *w;
4219 	LIST_HEAD(down_list);
4220 	int powerdown = 0;
4221 
4222 	mutex_lock(&card->dapm_mutex);
4223 
4224 	list_for_each_entry(w, &dapm->card->widgets, list) {
4225 		if (w->dapm != dapm)
4226 			continue;
4227 		if (w->power) {
4228 			dapm_seq_insert(w, &down_list, false);
4229 			w->power = 0;
4230 			powerdown = 1;
4231 		}
4232 	}
4233 
4234 	/* If there were no widgets to power down we're already in
4235 	 * standby.
4236 	 */
4237 	if (powerdown) {
4238 		if (dapm->bias_level == SND_SOC_BIAS_ON)
4239 			snd_soc_dapm_set_bias_level(dapm,
4240 						    SND_SOC_BIAS_PREPARE);
4241 		dapm_seq_run(card, &down_list, 0, false);
4242 		if (dapm->bias_level == SND_SOC_BIAS_PREPARE)
4243 			snd_soc_dapm_set_bias_level(dapm,
4244 						    SND_SOC_BIAS_STANDBY);
4245 	}
4246 
4247 	mutex_unlock(&card->dapm_mutex);
4248 }
4249 
4250 /*
4251  * snd_soc_dapm_shutdown - callback for system shutdown
4252  */
4253 void snd_soc_dapm_shutdown(struct snd_soc_card *card)
4254 {
4255 	struct snd_soc_dapm_context *dapm;
4256 
4257 	list_for_each_entry(dapm, &card->dapm_list, list) {
4258 		if (dapm != &card->dapm) {
4259 			soc_dapm_shutdown_dapm(dapm);
4260 			if (dapm->bias_level == SND_SOC_BIAS_STANDBY)
4261 				snd_soc_dapm_set_bias_level(dapm,
4262 							    SND_SOC_BIAS_OFF);
4263 		}
4264 	}
4265 
4266 	soc_dapm_shutdown_dapm(&card->dapm);
4267 	if (card->dapm.bias_level == SND_SOC_BIAS_STANDBY)
4268 		snd_soc_dapm_set_bias_level(&card->dapm,
4269 					    SND_SOC_BIAS_OFF);
4270 }
4271 
4272 /* Module information */
4273 MODULE_AUTHOR("Liam Girdwood, lrg@slimlogic.co.uk");
4274 MODULE_DESCRIPTION("Dynamic Audio Power Management core for ALSA SoC");
4275 MODULE_LICENSE("GPL");
4276