text: /*
   * soc-dapm.c  --  ALSA SoC Dynamic Audio Power Management
   *
   * Copyright 2005 Wolfson Microelectronics PLC.
   * Author: Liam Girdwood <lrg@slimlogic.co.uk>
   *
   *  This program is free software; you can redistribute  it and/or modify it
   *  under  the terms of  the GNU General  Public License as published by the
   *  Free Software Foundation;  either version 2 of the  License, or (at your
   *  option) any later version.
   *
   *  Features:
   *    o Changes power status of internal codec blocks depending on the
   *      dynamic configuration of codec internal audio paths and active
   *      DACs/ADCs.
   *    o Platform power domain - can support external components i.e. amps and
   *      mic/headphone insertion events.
   *    o Automatic Mic Bias support
   *    o Jack insertion power event initiation - e.g. hp insertion will enable
   *      sinks, dacs, etc
   *    o Delayed power down of audio subsystem to reduce pops between a quick
   *      device reopen.
   *
   */
  
  #include <linux/module.h>
  #include <linux/moduleparam.h>
  #include <linux/init.h>
  #include <linux/async.h>
  #include <linux/delay.h>
  #include <linux/pm.h>
  #include <linux/bitops.h>
  #include <linux/platform_device.h>
  #include <linux/jiffies.h>
  #include <linux/debugfs.h>
  #include <linux/pm_runtime.h>
  #include <linux/regulator/consumer.h>
  #include <linux/clk.h>
  #include <linux/slab.h>
  #include <sound/core.h>
  #include <sound/pcm.h>
  #include <sound/pcm_params.h>
  #include <sound/soc.h>
  #include <sound/initval.h>
  
  #include <trace/events/asoc.h>
  
  #define DAPM_UPDATE_STAT(widget, val) widget->dapm->card->dapm_stats.val++;
  
  static int snd_soc_dapm_add_path(struct snd_soc_dapm_context *dapm,
  	struct snd_soc_dapm_widget *wsource, struct snd_soc_dapm_widget *wsink,
  	const char *control,
  	int (*connected)(struct snd_soc_dapm_widget *source,
  			 struct snd_soc_dapm_widget *sink));
  static struct snd_soc_dapm_widget *
  snd_soc_dapm_new_control(struct snd_soc_dapm_context *dapm,
  			 const struct snd_soc_dapm_widget *widget);
  
  /* dapm power sequences - make this per codec in the future */
  static int dapm_up_seq[] = {
  	[snd_soc_dapm_pre] = 0,
  	[snd_soc_dapm_regulator_supply] = 1,
  	[snd_soc_dapm_clock_supply] = 1,
  	[snd_soc_dapm_supply] = 2,
  	[snd_soc_dapm_micbias] = 3,
  	[snd_soc_dapm_dai_link] = 2,
  	[snd_soc_dapm_dai_in] = 4,
  	[snd_soc_dapm_dai_out] = 4,
  	[snd_soc_dapm_aif_in] = 4,
  	[snd_soc_dapm_aif_out] = 4,
  	[snd_soc_dapm_mic] = 5,
  	[snd_soc_dapm_mux] = 6,
  	[snd_soc_dapm_dac] = 7,
  	[snd_soc_dapm_switch] = 8,
  	[snd_soc_dapm_mixer] = 8,
  	[snd_soc_dapm_mixer_named_ctl] = 8,
  	[snd_soc_dapm_pga] = 9,
  	[snd_soc_dapm_adc] = 10,
  	[snd_soc_dapm_out_drv] = 11,
  	[snd_soc_dapm_hp] = 11,
  	[snd_soc_dapm_spk] = 11,
  	[snd_soc_dapm_line] = 11,
  	[snd_soc_dapm_kcontrol] = 12,
  	[snd_soc_dapm_post] = 13,
  };
  
  static int dapm_down_seq[] = {
  	[snd_soc_dapm_pre] = 0,
  	[snd_soc_dapm_kcontrol] = 1,
  	[snd_soc_dapm_adc] = 2,
  	[snd_soc_dapm_hp] = 3,
  	[snd_soc_dapm_spk] = 3,
  	[snd_soc_dapm_line] = 3,
  	[snd_soc_dapm_out_drv] = 3,
  	[snd_soc_dapm_pga] = 4,
  	[snd_soc_dapm_switch] = 5,
  	[snd_soc_dapm_mixer_named_ctl] = 5,
  	[snd_soc_dapm_mixer] = 5,
  	[snd_soc_dapm_dac] = 6,
  	[snd_soc_dapm_mic] = 7,
  	[snd_soc_dapm_micbias] = 8,
  	[snd_soc_dapm_mux] = 9,
  	[snd_soc_dapm_aif_in] = 10,
  	[snd_soc_dapm_aif_out] = 10,
  	[snd_soc_dapm_dai_in] = 10,
  	[snd_soc_dapm_dai_out] = 10,
  	[snd_soc_dapm_dai_link] = 11,
  	[snd_soc_dapm_supply] = 12,
  	[snd_soc_dapm_clock_supply] = 13,
  	[snd_soc_dapm_regulator_supply] = 13,
  	[snd_soc_dapm_post] = 14,
  };
  
  static void dapm_assert_locked(struct snd_soc_dapm_context *dapm)
  {
  	if (dapm->card && dapm->card->instantiated)
  		lockdep_assert_held(&dapm->card->dapm_mutex);
  }
  
  static void pop_wait(u32 pop_time)
  {
  	if (pop_time)
  		schedule_timeout_uninterruptible(msecs_to_jiffies(pop_time));
  }
  
  static void pop_dbg(struct device *dev, u32 pop_time, const char *fmt, ...)
  {
  	va_list args;
  	char *buf;
  
  	if (!pop_time)
  		return;
  
  	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
  	if (buf == NULL)
  		return;
  
  	va_start(args, fmt);
  	vsnprintf(buf, PAGE_SIZE, fmt, args);
  	dev_info(dev, "%s", buf);
  	va_end(args);
  
  	kfree(buf);
  }
  
  static bool dapm_dirty_widget(struct snd_soc_dapm_widget *w)
  {
  	return !list_empty(&w->dirty);
  }
  
  static void dapm_mark_dirty(struct snd_soc_dapm_widget *w, const char *reason)
  {
  	dapm_assert_locked(w->dapm);
  
  	if (!dapm_dirty_widget(w)) {
  		dev_vdbg(w->dapm->dev, "Marking %s dirty due to %s\n",
  			 w->name, reason);
  		list_add_tail(&w->dirty, &w->dapm->card->dapm_dirty);
  	}
  }
  
  void dapm_mark_io_dirty(struct snd_soc_dapm_context *dapm)
  {
  	struct snd_soc_card *card = dapm->card;
  	struct snd_soc_dapm_widget *w;
  
  	mutex_lock(&card->dapm_mutex);
  
  	list_for_each_entry(w, &card->widgets, list) {
  		switch (w->id) {
  		case snd_soc_dapm_input:
  		case snd_soc_dapm_output:
  			dapm_mark_dirty(w, "Rechecking inputs and outputs");
  			break;
  		default:
  			break;
  		}
  	}
  
  	mutex_unlock(&card->dapm_mutex);
  }
  EXPORT_SYMBOL_GPL(dapm_mark_io_dirty);
  
  /* create a new dapm widget */
  static inline struct snd_soc_dapm_widget *dapm_cnew_widget(
  	const struct snd_soc_dapm_widget *_widget)
  {
  	return kmemdup(_widget, sizeof(*_widget), GFP_KERNEL);
  }
  
  struct dapm_kcontrol_data {
  	unsigned int value;
  	struct snd_soc_dapm_widget *widget;
  	struct list_head paths;
  	struct snd_soc_dapm_widget_list *wlist;
  };
  
  static int dapm_kcontrol_data_alloc(struct snd_soc_dapm_widget *widget,
  	struct snd_kcontrol *kcontrol)
  {
  	struct dapm_kcontrol_data *data;
  	struct soc_mixer_control *mc;
  
  	data = kzalloc(sizeof(*data), GFP_KERNEL);
  	if (!data) {
  		dev_err(widget->dapm->dev,
  				"ASoC: can't allocate kcontrol data for %s\n",
  				widget->name);
  		return -ENOMEM;
  	}
  
  	INIT_LIST_HEAD(&data->paths);
  
  	switch (widget->id) {
  	case snd_soc_dapm_switch:
  	case snd_soc_dapm_mixer:
  	case snd_soc_dapm_mixer_named_ctl:
  		mc = (struct soc_mixer_control *)kcontrol->private_value;
  
  		if (mc->autodisable) {
  			struct snd_soc_dapm_widget template;
  
  			memset(&template, 0, sizeof(template));
  			template.reg = mc->reg;
  			template.mask = (1 << fls(mc->max)) - 1;
  			template.shift = mc->shift;
  			if (mc->invert)
  				template.off_val = mc->max;
  			else
  				template.off_val = 0;
  			template.on_val = template.off_val;
  			template.id = snd_soc_dapm_kcontrol;
  			template.name = kcontrol->id.name;
  
  			data->value = template.on_val;
  
  			data->widget = snd_soc_dapm_new_control(widget->dapm,
  				&template);
  			if (!data->widget) {
  				kfree(data);
  				return -ENOMEM;
  			}
  		}
  		break;
  	default:
  		break;
  	}
  
  	kcontrol->private_data = data;
  
  	return 0;
  }
  
  static void dapm_kcontrol_free(struct snd_kcontrol *kctl)
  {
  	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kctl);
  	kfree(data->wlist);
  	kfree(data);
  }
  
  static struct snd_soc_dapm_widget_list *dapm_kcontrol_get_wlist(
  	const struct snd_kcontrol *kcontrol)
  {
  	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
  
  	return data->wlist;
  }
  
  static int dapm_kcontrol_add_widget(struct snd_kcontrol *kcontrol,
  	struct snd_soc_dapm_widget *widget)
  {
  	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
  	struct snd_soc_dapm_widget_list *new_wlist;
  	unsigned int n;
  
  	if (data->wlist)
  		n = data->wlist->num_widgets + 1;
  	else
  		n = 1;
  
  	new_wlist = krealloc(data->wlist,
  			sizeof(*new_wlist) + sizeof(widget) * n, GFP_KERNEL);
  	if (!new_wlist)
  		return -ENOMEM;
  
  	new_wlist->widgets[n - 1] = widget;
  	new_wlist->num_widgets = n;
  
  	data->wlist = new_wlist;
  
  	return 0;
  }
  
  static void dapm_kcontrol_add_path(const struct snd_kcontrol *kcontrol,
  	struct snd_soc_dapm_path *path)
  {
  	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
  
  	list_add_tail(&path->list_kcontrol, &data->paths);
  
  	if (data->widget) {
  		snd_soc_dapm_add_path(data->widget->dapm, data->widget,
  		    path->source, NULL, NULL);
  	}
  }
  
  static bool dapm_kcontrol_is_powered(const struct snd_kcontrol *kcontrol)
  {
  	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
  
  	if (!data->widget)
  		return true;
  
  	return data->widget->power;
  }
  
  static struct list_head *dapm_kcontrol_get_path_list(
  	const struct snd_kcontrol *kcontrol)
  {
  	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
  
  	return &data->paths;
  }
  
  #define dapm_kcontrol_for_each_path(path, kcontrol) \
  	list_for_each_entry(path, dapm_kcontrol_get_path_list(kcontrol), \
  		list_kcontrol)
  
  static unsigned int dapm_kcontrol_get_value(const struct snd_kcontrol *kcontrol)
  {
  	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
  
  	return data->value;
  }
  
  static bool dapm_kcontrol_set_value(const struct snd_kcontrol *kcontrol,
  	unsigned int value)
  {
  	struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
  
  	if (data->value == value)
  		return false;
  
  	if (data->widget)
  		data->widget->on_val = value;
  
  	data->value = value;
  
  	return true;
  }
  
  /**
   * snd_soc_dapm_kcontrol_codec() - Returns the codec associated to a kcontrol
   * @kcontrol: The kcontrol
   */
  struct snd_soc_codec *snd_soc_dapm_kcontrol_codec(struct snd_kcontrol *kcontrol)
  {
  	return dapm_kcontrol_get_wlist(kcontrol)->widgets[0]->codec;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_kcontrol_codec);
  
  static void dapm_reset(struct snd_soc_card *card)
  {
  	struct snd_soc_dapm_widget *w;
  
  	lockdep_assert_held(&card->dapm_mutex);
  
  	memset(&card->dapm_stats, 0, sizeof(card->dapm_stats));
  
  	list_for_each_entry(w, &card->widgets, list) {
  		w->new_power = w->power;
  		w->power_checked = false;
  		w->inputs = -1;
  		w->outputs = -1;
  	}
  }
  
  static int soc_widget_read(struct snd_soc_dapm_widget *w, int reg,
  	unsigned int *value)
  {
  	if (!w->dapm->component)
  		return -EIO;
  	return snd_soc_component_read(w->dapm->component, reg, value);
  }
  
  static int soc_widget_update_bits(struct snd_soc_dapm_widget *w,
  	int reg, unsigned int mask, unsigned int value)
  {
  	if (!w->dapm->component)
  		return -EIO;
  	return snd_soc_component_update_bits_async(w->dapm->component, reg,
  		mask, value);
  }
  
  static void soc_dapm_async_complete(struct snd_soc_dapm_context *dapm)
  {
  	if (dapm->component)
  		snd_soc_component_async_complete(dapm->component);
  }
  
  /**
   * snd_soc_dapm_set_bias_level - set the bias level for the system
   * @dapm: DAPM context
   * @level: level to configure
   *
   * Configure the bias (power) levels for the SoC audio device.
   *
   * Returns 0 for success else error.
   */
  static int snd_soc_dapm_set_bias_level(struct snd_soc_dapm_context *dapm,
  				       enum snd_soc_bias_level level)
  {
  	struct snd_soc_card *card = dapm->card;
  	int ret = 0;
  
  	trace_snd_soc_bias_level_start(card, level);
  
  	if (card && card->set_bias_level)
  		ret = card->set_bias_level(card, dapm, level);
  	if (ret != 0)
  		goto out;
  
  	if (dapm->codec) {
  		if (dapm->codec->driver->set_bias_level)
  			ret = dapm->codec->driver->set_bias_level(dapm->codec,
  								  level);
  		else
  			dapm->bias_level = level;
  	} else if (!card || dapm != &card->dapm) {
  		dapm->bias_level = level;
  	}
  
  	if (ret != 0)
  		goto out;
  
  	if (card && card->set_bias_level_post)
  		ret = card->set_bias_level_post(card, dapm, level);
  out:
  	trace_snd_soc_bias_level_done(card, level);
  
  	return ret;
  }
  
  /* connect mux widget to its interconnecting audio paths */
  static int dapm_connect_mux(struct snd_soc_dapm_context *dapm,
  	struct snd_soc_dapm_widget *src, struct snd_soc_dapm_widget *dest,
  	struct snd_soc_dapm_path *path, const char *control_name,
  	const struct snd_kcontrol_new *kcontrol)
  {
  	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
  	unsigned int val, item;
  	int i;
  
  	if (e->reg != SND_SOC_NOPM) {
  		soc_widget_read(dest, e->reg, &val);
  		val = (val >> e->shift_l) & e->mask;
  		item = snd_soc_enum_val_to_item(e, val);
  	} else {
  		/* since a virtual mux has no backing registers to
  		 * decide which path to connect, it will try to match
  		 * with the first enumeration.  This is to ensure
  		 * that the default mux choice (the first) will be
  		 * correctly powered up during initialization.
  		 */
  		item = 0;
  	}
  
  	for (i = 0; i < e->items; i++) {
  		if (!(strcmp(control_name, e->texts[i]))) {
  			list_add(&path->list, &dapm->card->paths);
  			list_add(&path->list_sink, &dest->sources);
  			list_add(&path->list_source, &src->sinks);
  			path->name = (char*)e->texts[i];
  			if (i == item)
  				path->connect = 1;
  			else
  				path->connect = 0;
  			return 0;
  		}
  	}
  
  	return -ENODEV;
  }
  
  /* set up initial codec paths */
  static void dapm_set_mixer_path_status(struct snd_soc_dapm_widget *w,
  	struct snd_soc_dapm_path *p, int i)
  {
  	struct soc_mixer_control *mc = (struct soc_mixer_control *)
  		w->kcontrol_news[i].private_value;
  	unsigned int reg = mc->reg;
  	unsigned int shift = mc->shift;
  	unsigned int max = mc->max;
  	unsigned int mask = (1 << fls(max)) - 1;
  	unsigned int invert = mc->invert;
  	unsigned int val;
  
  	if (reg != SND_SOC_NOPM) {
  		soc_widget_read(w, reg, &val);
  		val = (val >> shift) & mask;
  		if (invert)
  			val = max - val;
  		p->connect = !!val;
  	} else {
  		p->connect = 0;
  	}
  }
  
  /* connect mixer widget to its interconnecting audio paths */
  static int dapm_connect_mixer(struct snd_soc_dapm_context *dapm,
  	struct snd_soc_dapm_widget *src, struct snd_soc_dapm_widget *dest,
  	struct snd_soc_dapm_path *path, const char *control_name)
  {
  	int i;
  
  	/* search for mixer kcontrol */
  	for (i = 0; i < dest->num_kcontrols; i++) {
  		if (!strcmp(control_name, dest->kcontrol_news[i].name)) {
  			list_add(&path->list, &dapm->card->paths);
  			list_add(&path->list_sink, &dest->sources);
  			list_add(&path->list_source, &src->sinks);
  			path->name = dest->kcontrol_news[i].name;
  			dapm_set_mixer_path_status(dest, path, i);
  			return 0;
  		}
  	}
  	return -ENODEV;
  }
  
  static int dapm_is_shared_kcontrol(struct snd_soc_dapm_context *dapm,
  	struct snd_soc_dapm_widget *kcontrolw,
  	const struct snd_kcontrol_new *kcontrol_new,
  	struct snd_kcontrol **kcontrol)
  {
  	struct snd_soc_dapm_widget *w;
  	int i;
  
  	*kcontrol = NULL;
  
  	list_for_each_entry(w, &dapm->card->widgets, list) {
  		if (w == kcontrolw || w->dapm != kcontrolw->dapm)
  			continue;
  		for (i = 0; i < w->num_kcontrols; i++) {
  			if (&w->kcontrol_news[i] == kcontrol_new) {
  				if (w->kcontrols)
  					*kcontrol = w->kcontrols[i];
  				return 1;
  			}
  		}
  	}
  
  	return 0;
  }
  
  /*
   * Determine if a kcontrol is shared. If it is, look it up. If it isn't,
   * create it. Either way, add the widget into the control's widget list
   */
  static int dapm_create_or_share_mixmux_kcontrol(struct snd_soc_dapm_widget *w,
  	int kci)
  {
  	struct snd_soc_dapm_context *dapm = w->dapm;
  	struct snd_card *card = dapm->card->snd_card;
  	const char *prefix;
  	size_t prefix_len;
  	int shared;
  	struct snd_kcontrol *kcontrol;
  	bool wname_in_long_name, kcname_in_long_name;
  	char *long_name;
  	const char *name;
  	int ret;
  
  	if (dapm->codec)
  		prefix = dapm->codec->name_prefix;
  	else
  		prefix = NULL;
  
  	if (prefix)
  		prefix_len = strlen(prefix) + 1;
  	else
  		prefix_len = 0;
  
  	shared = dapm_is_shared_kcontrol(dapm, w, &w->kcontrol_news[kci],
  					 &kcontrol);
  
  	if (!kcontrol) {
  		if (shared) {
  			wname_in_long_name = false;
  			kcname_in_long_name = true;
  		} else {
  			switch (w->id) {
  			case snd_soc_dapm_switch:
  			case snd_soc_dapm_mixer:
  				wname_in_long_name = true;
  				kcname_in_long_name = true;
  				break;
  			case snd_soc_dapm_mixer_named_ctl:
  				wname_in_long_name = false;
  				kcname_in_long_name = true;
  				break;
  			case snd_soc_dapm_mux:
  				wname_in_long_name = true;
  				kcname_in_long_name = false;
  				break;
  			default:
  				return -EINVAL;
  			}
  		}
  
  		if (wname_in_long_name && kcname_in_long_name) {
  			/*
  			 * The control will get a prefix from the control
  			 * creation process but we're also using the same
  			 * prefix for widgets so cut the prefix off the
  			 * front of the widget name.
  			 */
  			long_name = kasprintf(GFP_KERNEL, "%s %s",
  				 w->name + prefix_len,
  				 w->kcontrol_news[kci].name);
  			if (long_name == NULL)
  				return -ENOMEM;
  
  			name = long_name;
  		} else if (wname_in_long_name) {
  			long_name = NULL;
  			name = w->name + prefix_len;
  		} else {
  			long_name = NULL;
  			name = w->kcontrol_news[kci].name;
  		}
  
  		kcontrol = snd_soc_cnew(&w->kcontrol_news[kci], NULL, name,
  					prefix);
  		kfree(long_name);
  		if (!kcontrol)
  			return -ENOMEM;
  		kcontrol->private_free = dapm_kcontrol_free;
  
  		ret = dapm_kcontrol_data_alloc(w, kcontrol);
  		if (ret) {
  			snd_ctl_free_one(kcontrol);
  			return ret;
  		}
  
  		ret = snd_ctl_add(card, kcontrol);
  		if (ret < 0) {
  			dev_err(dapm->dev,
  				"ASoC: failed to add widget %s dapm kcontrol %s: %d\n",
  				w->name, name, ret);
  			return ret;
  		}
  	}
  
  	ret = dapm_kcontrol_add_widget(kcontrol, w);
  	if (ret)
  		return ret;
  
  	w->kcontrols[kci] = kcontrol;
  
  	return 0;
  }
  
  /* create new dapm mixer control */
  static int dapm_new_mixer(struct snd_soc_dapm_widget *w)
  {
  	int i, ret;
  	struct snd_soc_dapm_path *path;
  
  	/* add kcontrol */
  	for (i = 0; i < w->num_kcontrols; i++) {
  		/* match name */
  		list_for_each_entry(path, &w->sources, list_sink) {
  			/* mixer/mux paths name must match control name */
  			if (path->name != (char *)w->kcontrol_news[i].name)
  				continue;
  
  			if (w->kcontrols[i]) {
  				dapm_kcontrol_add_path(w->kcontrols[i], path);
  				continue;
  			}
  
  			ret = dapm_create_or_share_mixmux_kcontrol(w, i);
  			if (ret < 0)
  				return ret;
  
  			dapm_kcontrol_add_path(w->kcontrols[i], path);
  		}
  	}
  
  	return 0;
  }
  
  /* create new dapm mux control */
  static int dapm_new_mux(struct snd_soc_dapm_widget *w)
  {
  	struct snd_soc_dapm_context *dapm = w->dapm;
  	struct snd_soc_dapm_path *path;
  	int ret;
  
  	if (w->num_kcontrols != 1) {
  		dev_err(dapm->dev,
  			"ASoC: mux %s has incorrect number of controls\n",
  			w->name);
  		return -EINVAL;
  	}
  
  	if (list_empty(&w->sources)) {
  		dev_err(dapm->dev, "ASoC: mux %s has no paths\n", w->name);
  		return -EINVAL;
  	}
  
  	ret = dapm_create_or_share_mixmux_kcontrol(w, 0);
  	if (ret < 0)
  		return ret;
  
  	list_for_each_entry(path, &w->sources, list_sink)
  		dapm_kcontrol_add_path(w->kcontrols[0], path);
  
  	return 0;
  }
  
  /* create new dapm volume control */
  static int dapm_new_pga(struct snd_soc_dapm_widget *w)
  {
  	if (w->num_kcontrols)
  		dev_err(w->dapm->dev,
  			"ASoC: PGA controls not supported: '%s'\n", w->name);
  
  	return 0;
  }
  
  /* reset 'walked' bit for each dapm path */
  static void dapm_clear_walk_output(struct snd_soc_dapm_context *dapm,
  				   struct list_head *sink)
  {
  	struct snd_soc_dapm_path *p;
  
  	list_for_each_entry(p, sink, list_source) {
  		if (p->walked) {
  			p->walked = 0;
  			dapm_clear_walk_output(dapm, &p->sink->sinks);
  		}
  	}
  }
  
  static void dapm_clear_walk_input(struct snd_soc_dapm_context *dapm,
  				  struct list_head *source)
  {
  	struct snd_soc_dapm_path *p;
  
  	list_for_each_entry(p, source, list_sink) {
  		if (p->walked) {
  			p->walked = 0;
  			dapm_clear_walk_input(dapm, &p->source->sources);
  		}
  	}
  }
  
  
  /* We implement power down on suspend by checking the power state of
   * the ALSA card - when we are suspending the ALSA state for the card
   * is set to D3.
   */
  static int snd_soc_dapm_suspend_check(struct snd_soc_dapm_widget *widget)
  {
  	int level = snd_power_get_state(widget->dapm->card->snd_card);
  
  	switch (level) {
  	case SNDRV_CTL_POWER_D3hot:
  	case SNDRV_CTL_POWER_D3cold:
  		if (widget->ignore_suspend)
  			dev_dbg(widget->dapm->dev, "ASoC: %s ignoring suspend\n",
  				widget->name);
  		return widget->ignore_suspend;
  	default:
  		return 1;
  	}
  }
  
  /* add widget to list if it's not already in the list */
  static int dapm_list_add_widget(struct snd_soc_dapm_widget_list **list,
  	struct snd_soc_dapm_widget *w)
  {
  	struct snd_soc_dapm_widget_list *wlist;
  	int wlistsize, wlistentries, i;
  
  	if (*list == NULL)
  		return -EINVAL;
  
  	wlist = *list;
  
  	/* is this widget already in the list */
  	for (i = 0; i < wlist->num_widgets; i++) {
  		if (wlist->widgets[i] == w)
  			return 0;
  	}
  
  	/* allocate some new space */
  	wlistentries = wlist->num_widgets + 1;
  	wlistsize = sizeof(struct snd_soc_dapm_widget_list) +
  			wlistentries * sizeof(struct snd_soc_dapm_widget *);
  	*list = krealloc(wlist, wlistsize, GFP_KERNEL);
  	if (*list == NULL) {
  		dev_err(w->dapm->dev, "ASoC: can't allocate widget list for %s\n",
  			w->name);
  		return -ENOMEM;
  	}
  	wlist = *list;
  
  	/* insert the widget */
  	dev_dbg(w->dapm->dev, "ASoC: added %s in widget list pos %d\n",
  			w->name, wlist->num_widgets);
  
  	wlist->widgets[wlist->num_widgets] = w;
  	wlist->num_widgets++;
  	return 1;
  }
  
  /*
   * Recursively check for a completed path to an active or physically connected
   * output widget. Returns number of complete paths.
   */
  static int is_connected_output_ep(struct snd_soc_dapm_widget *widget,
  	struct snd_soc_dapm_widget_list **list)
  {
  	struct snd_soc_dapm_path *path;
  	int con = 0;
  
  	if (widget->outputs >= 0)
  		return widget->outputs;
  
  	DAPM_UPDATE_STAT(widget, path_checks);
  
  	switch (widget->id) {
  	case snd_soc_dapm_supply:
  	case snd_soc_dapm_regulator_supply:
  	case snd_soc_dapm_clock_supply:
  	case snd_soc_dapm_kcontrol:
  		return 0;
  	default:
  		break;
  	}
  
  	switch (widget->id) {
  	case snd_soc_dapm_adc:
  	case snd_soc_dapm_aif_out:
  	case snd_soc_dapm_dai_out:
  		if (widget->active) {
  			widget->outputs = snd_soc_dapm_suspend_check(widget);
  			return widget->outputs;
  		}
  	default:
  		break;
  	}
  
  	if (widget->connected) {
  		/* connected pin ? */
  		if (widget->id == snd_soc_dapm_output && !widget->ext) {
  			widget->outputs = snd_soc_dapm_suspend_check(widget);
  			return widget->outputs;
  		}
  
  		/* connected jack or spk ? */
  		if (widget->id == snd_soc_dapm_hp ||
  		    widget->id == snd_soc_dapm_spk ||
  		    (widget->id == snd_soc_dapm_line &&
  		     !list_empty(&widget->sources))) {
  			widget->outputs = snd_soc_dapm_suspend_check(widget);
  			return widget->outputs;
  		}
  	}
  
  	list_for_each_entry(path, &widget->sinks, list_source) {
  		DAPM_UPDATE_STAT(widget, neighbour_checks);
  
  		if (path->weak)
  			continue;
  
  		if (path->walking)
  			return 1;
  
  		if (path->walked)
  			continue;
  
  		trace_snd_soc_dapm_output_path(widget, path);
  
  		if (path->sink && path->connect) {
  			path->walked = 1;
  			path->walking = 1;
  
  			/* do we need to add this widget to the list ? */
  			if (list) {
  				int err;
  				err = dapm_list_add_widget(list, path->sink);
  				if (err < 0) {
  					dev_err(widget->dapm->dev,
  						"ASoC: could not add widget %s\n",
  						widget->name);
  					path->walking = 0;
  					return con;
  				}
  			}
  
  			con += is_connected_output_ep(path->sink, list);
  
  			path->walking = 0;
  		}
  	}
  
  	widget->outputs = con;
  
  	return con;
  }
  
  /*
   * Recursively check for a completed path to an active or physically connected
   * input widget. Returns number of complete paths.
   */
  static int is_connected_input_ep(struct snd_soc_dapm_widget *widget,
  	struct snd_soc_dapm_widget_list **list)
  {
  	struct snd_soc_dapm_path *path;
  	int con = 0;
  
  	if (widget->inputs >= 0)
  		return widget->inputs;
  
  	DAPM_UPDATE_STAT(widget, path_checks);
  
  	switch (widget->id) {
  	case snd_soc_dapm_supply:
  	case snd_soc_dapm_regulator_supply:
  	case snd_soc_dapm_clock_supply:
  	case snd_soc_dapm_kcontrol:
  		return 0;
  	default:
  		break;
  	}
  
  	/* active stream ? */
  	switch (widget->id) {
  	case snd_soc_dapm_dac:
  	case snd_soc_dapm_aif_in:
  	case snd_soc_dapm_dai_in:
  		if (widget->active) {
  			widget->inputs = snd_soc_dapm_suspend_check(widget);
  			return widget->inputs;
  		}
  	default:
  		break;
  	}
  
  	if (widget->connected) {
  		/* connected pin ? */
  		if (widget->id == snd_soc_dapm_input && !widget->ext) {
  			widget->inputs = snd_soc_dapm_suspend_check(widget);
  			return widget->inputs;
  		}
  
  		/* connected VMID/Bias for lower pops */
  		if (widget->id == snd_soc_dapm_vmid) {
  			widget->inputs = snd_soc_dapm_suspend_check(widget);
  			return widget->inputs;
  		}
  
  		/* connected jack ? */
  		if (widget->id == snd_soc_dapm_mic ||
  		    (widget->id == snd_soc_dapm_line &&
  		     !list_empty(&widget->sinks))) {
  			widget->inputs = snd_soc_dapm_suspend_check(widget);
  			return widget->inputs;
  		}
  
  		/* signal generator */
  		if (widget->id == snd_soc_dapm_siggen) {
  			widget->inputs = snd_soc_dapm_suspend_check(widget);
  			return widget->inputs;
  		}
  	}
  
  	list_for_each_entry(path, &widget->sources, list_sink) {
  		DAPM_UPDATE_STAT(widget, neighbour_checks);
  
  		if (path->weak)
  			continue;
  
  		if (path->walking)
  			return 1;
  
  		if (path->walked)
  			continue;
  
  		trace_snd_soc_dapm_input_path(widget, path);
  
  		if (path->source && path->connect) {
  			path->walked = 1;
  			path->walking = 1;
  
  			/* do we need to add this widget to the list ? */
  			if (list) {
  				int err;
  				err = dapm_list_add_widget(list, path->source);
  				if (err < 0) {
  					dev_err(widget->dapm->dev,
  						"ASoC: could not add widget %s\n",
  						widget->name);
  					path->walking = 0;
  					return con;
  				}
  			}
  
  			con += is_connected_input_ep(path->source, list);
  
  			path->walking = 0;
  		}
  	}
  
  	widget->inputs = con;
  
  	return con;
  }
  
  /**
   * snd_soc_dapm_get_connected_widgets - query audio path and it's widgets.
   * @dai: the soc DAI.
   * @stream: stream direction.
   * @list: list of active widgets for this stream.
   *
   * Queries DAPM graph as to whether an valid audio stream path exists for
   * the initial stream specified by name. This takes into account
   * current mixer and mux kcontrol settings. Creates list of valid widgets.
   *
   * Returns the number of valid paths or negative error.
   */
  int snd_soc_dapm_dai_get_connected_widgets(struct snd_soc_dai *dai, int stream,
  	struct snd_soc_dapm_widget_list **list)
  {
  	struct snd_soc_card *card = dai->card;
  	int paths;
  
  	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
  	dapm_reset(card);
  
  	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
  		paths = is_connected_output_ep(dai->playback_widget, list);
  		dapm_clear_walk_output(&card->dapm,
  				       &dai->playback_widget->sinks);
  	} else {
  		paths = is_connected_input_ep(dai->capture_widget, list);
  		dapm_clear_walk_input(&card->dapm,
  				      &dai->capture_widget->sources);
  	}
  
  	trace_snd_soc_dapm_connected(paths, stream);
  	mutex_unlock(&card->dapm_mutex);
  
  	return paths;
  }
  
  /*
   * Handler for regulator supply widget.
   */
  int dapm_regulator_event(struct snd_soc_dapm_widget *w,
  		   struct snd_kcontrol *kcontrol, int event)
  {
  	int ret;
  
  	soc_dapm_async_complete(w->dapm);
  
  	if (SND_SOC_DAPM_EVENT_ON(event)) {
  		if (w->on_val & SND_SOC_DAPM_REGULATOR_BYPASS) {
  			ret = regulator_allow_bypass(w->regulator, false);
  			if (ret != 0)
  				dev_warn(w->dapm->dev,
  					 "ASoC: Failed to unbypass %s: %d\n",
  					 w->name, ret);
  		}
  
  		return regulator_enable(w->regulator);
  	} else {
  		if (w->on_val & SND_SOC_DAPM_REGULATOR_BYPASS) {
  			ret = regulator_allow_bypass(w->regulator, true);
  			if (ret != 0)
  				dev_warn(w->dapm->dev,
  					 "ASoC: Failed to bypass %s: %d\n",
  					 w->name, ret);
  		}
  
  		return regulator_disable_deferred(w->regulator, w->shift);
  	}
  }
  EXPORT_SYMBOL_GPL(dapm_regulator_event);
  
  /*
   * Handler for clock supply widget.
   */
  int dapm_clock_event(struct snd_soc_dapm_widget *w,
  		   struct snd_kcontrol *kcontrol, int event)
  {
  	if (!w->clk)
  		return -EIO;
  
  	soc_dapm_async_complete(w->dapm);
  
  #ifdef CONFIG_HAVE_CLK
  	if (SND_SOC_DAPM_EVENT_ON(event)) {
  		return clk_prepare_enable(w->clk);
  	} else {
  		clk_disable_unprepare(w->clk);
  		return 0;
  	}
  #endif
  	return 0;
  }
  EXPORT_SYMBOL_GPL(dapm_clock_event);
  
  static int dapm_widget_power_check(struct snd_soc_dapm_widget *w)
  {
  	if (w->power_checked)
  		return w->new_power;
  
  	if (w->force)
  		w->new_power = 1;
  	else
  		w->new_power = w->power_check(w);
  
  	w->power_checked = true;
  
  	return w->new_power;
  }
  
  /* Generic check to see if a widget should be powered.
   */
  static int dapm_generic_check_power(struct snd_soc_dapm_widget *w)
  {
  	int in, out;
  
  	DAPM_UPDATE_STAT(w, power_checks);
  
  	in = is_connected_input_ep(w, NULL);
  	dapm_clear_walk_input(w->dapm, &w->sources);
  	out = is_connected_output_ep(w, NULL);
  	dapm_clear_walk_output(w->dapm, &w->sinks);
  	return out != 0 && in != 0;
  }
  
  /* Check to see if an ADC has power */
  static int dapm_adc_check_power(struct snd_soc_dapm_widget *w)
  {
  	int in;
  
  	DAPM_UPDATE_STAT(w, power_checks);
  
  	if (w->active) {
  		in = is_connected_input_ep(w, NULL);
  		dapm_clear_walk_input(w->dapm, &w->sources);
  		return in != 0;
  	} else {
  		return dapm_generic_check_power(w);
  	}
  }
  
  /* Check to see if a DAC has power */
  static int dapm_dac_check_power(struct snd_soc_dapm_widget *w)
  {
  	int out;
  
  	DAPM_UPDATE_STAT(w, power_checks);
  
  	if (w->active) {
  		out = is_connected_output_ep(w, NULL);
  		dapm_clear_walk_output(w->dapm, &w->sinks);
  		return out != 0;
  	} else {
  		return dapm_generic_check_power(w);
  	}
  }
  
  /* Check to see if a power supply is needed */
  static int dapm_supply_check_power(struct snd_soc_dapm_widget *w)
  {
  	struct snd_soc_dapm_path *path;
  
  	DAPM_UPDATE_STAT(w, power_checks);
  
  	/* Check if one of our outputs is connected */
  	list_for_each_entry(path, &w->sinks, list_source) {
  		DAPM_UPDATE_STAT(w, neighbour_checks);
  
  		if (path->weak)
  			continue;
  
  		if (path->connected &&
  		    !path->connected(path->source, path->sink))
  			continue;
  
  		if (!path->sink)
  			continue;
  
  		if (dapm_widget_power_check(path->sink))
  			return 1;
  	}
  
  	return 0;
  }
  
  static int dapm_always_on_check_power(struct snd_soc_dapm_widget *w)
  {
  	return 1;
  }
  
  static int dapm_seq_compare(struct snd_soc_dapm_widget *a,
  			    struct snd_soc_dapm_widget *b,
  			    bool power_up)
  {
  	int *sort;
  
  	if (power_up)
  		sort = dapm_up_seq;
  	else
  		sort = dapm_down_seq;
  
  	if (sort[a->id] != sort[b->id])
  		return sort[a->id] - sort[b->id];
  	if (a->subseq != b->subseq) {
  		if (power_up)
  			return a->subseq - b->subseq;
  		else
  			return b->subseq - a->subseq;
  	}
  	if (a->reg != b->reg)
  		return a->reg - b->reg;
  	if (a->dapm != b->dapm)
  		return (unsigned long)a->dapm - (unsigned long)b->dapm;
  
  	return 0;
  }
  
  /* Insert a widget in order into a DAPM power sequence. */
  static void dapm_seq_insert(struct snd_soc_dapm_widget *new_widget,
  			    struct list_head *list,
  			    bool power_up)
  {
  	struct snd_soc_dapm_widget *w;
  
  	list_for_each_entry(w, list, power_list)
  		if (dapm_seq_compare(new_widget, w, power_up) < 0) {
  			list_add_tail(&new_widget->power_list, &w->power_list);
  			return;
  		}
  
  	list_add_tail(&new_widget->power_list, list);
  }
  
  static void dapm_seq_check_event(struct snd_soc_card *card,
  				 struct snd_soc_dapm_widget *w, int event)
  {
  	const char *ev_name;
  	int power, ret;
  
  	switch (event) {
  	case SND_SOC_DAPM_PRE_PMU:
  		ev_name = "PRE_PMU";
  		power = 1;
  		break;
  	case SND_SOC_DAPM_POST_PMU:
  		ev_name = "POST_PMU";
  		power = 1;
  		break;
  	case SND_SOC_DAPM_PRE_PMD:
  		ev_name = "PRE_PMD";
  		power = 0;
  		break;
  	case SND_SOC_DAPM_POST_PMD:
  		ev_name = "POST_PMD";
  		power = 0;
  		break;
  	case SND_SOC_DAPM_WILL_PMU:
  		ev_name = "WILL_PMU";
  		power = 1;
  		break;
  	case SND_SOC_DAPM_WILL_PMD:
  		ev_name = "WILL_PMD";
  		power = 0;
  		break;
  	default:
  		WARN(1, "Unknown event %d\n", event);
  		return;
  	}
  
  	if (w->new_power != power)
  		return;
  
  	if (w->event && (w->event_flags & event)) {
  		pop_dbg(w->dapm->dev, card->pop_time, "pop test : %s %s\n",
  			w->name, ev_name);
  		soc_dapm_async_complete(w->dapm);
  		trace_snd_soc_dapm_widget_event_start(w, event);
  		ret = w->event(w, NULL, event);
  		trace_snd_soc_dapm_widget_event_done(w, event);
  		if (ret < 0)
  			dev_err(w->dapm->dev, "ASoC: %s: %s event failed: %d\n",
  			       ev_name, w->name, ret);
  	}
  }
  
  /* Apply the coalesced changes from a DAPM sequence */
  static void dapm_seq_run_coalesced(struct snd_soc_card *card,
  				   struct list_head *pending)
  {
  	struct snd_soc_dapm_widget *w;
  	int reg;
  	unsigned int value = 0;
  	unsigned int mask = 0;
  
  	reg = list_first_entry(pending, struct snd_soc_dapm_widget,
  			       power_list)->reg;
  
  	list_for_each_entry(w, pending, power_list) {
  		WARN_ON(reg != w->reg);
  		w->power = w->new_power;
  
  		mask |= w->mask << w->shift;
  		if (w->power)
  			value |= w->on_val << w->shift;
  		else
  			value |= w->off_val << w->shift;
  
  		pop_dbg(w->dapm->dev, card->pop_time,
  			"pop test : Queue %s: reg=0x%x, 0x%x/0x%x\n",
  			w->name, reg, value, mask);
  
  		/* Check for events */
  		dapm_seq_check_event(card, w, SND_SOC_DAPM_PRE_PMU);
  		dapm_seq_check_event(card, w, SND_SOC_DAPM_PRE_PMD);
  	}
  
  	if (reg >= 0) {
  		/* Any widget will do, they should all be updating the
  		 * same register.
  		 */
  		w = list_first_entry(pending, struct snd_soc_dapm_widget,
  				     power_list);
  
  		pop_dbg(w->dapm->dev, card->pop_time,
  			"pop test : Applying 0x%x/0x%x to %x in %dms\n",
  			value, mask, reg, card->pop_time);
  		pop_wait(card->pop_time);
  		soc_widget_update_bits(w, reg, mask, value);
  	}
  
  	list_for_each_entry(w, pending, power_list) {
  		dapm_seq_check_event(card, w, SND_SOC_DAPM_POST_PMU);
  		dapm_seq_check_event(card, w, SND_SOC_DAPM_POST_PMD);
  	}
  }
  
  /* Apply a DAPM power sequence.
   *
   * We walk over a pre-sorted list of widgets to apply power to.  In
   * order to minimise the number of writes to the device required
   * multiple widgets will be updated in a single write where possible.
   * Currently anything that requires more than a single write is not
   * handled.
   */
  static void dapm_seq_run(struct snd_soc_card *card,
  	struct list_head *list, int event, bool power_up)
  {
  	struct snd_soc_dapm_widget *w, *n;
  	struct snd_soc_dapm_context *d;
  	LIST_HEAD(pending);
  	int cur_sort = -1;
  	int cur_subseq = -1;
  	int cur_reg = SND_SOC_NOPM;
  	struct snd_soc_dapm_context *cur_dapm = NULL;
  	int ret, i;
  	int *sort;
  
  	if (power_up)
  		sort = dapm_up_seq;
  	else
  		sort = dapm_down_seq;
  
  	list_for_each_entry_safe(w, n, list, power_list) {
  		ret = 0;
  
  		/* Do we need to apply any queued changes? */
  		if (sort[w->id] != cur_sort || w->reg != cur_reg ||
  		    w->dapm != cur_dapm || w->subseq != cur_subseq) {
  			if (!list_empty(&pending))
  				dapm_seq_run_coalesced(card, &pending);
  
  			if (cur_dapm && cur_dapm->seq_notifier) {
  				for (i = 0; i < ARRAY_SIZE(dapm_up_seq); i++)
  					if (sort[i] == cur_sort)
  						cur_dapm->seq_notifier(cur_dapm,
  								       i,
  								       cur_subseq);
  			}
  
  			if (cur_dapm && w->dapm != cur_dapm)
  				soc_dapm_async_complete(cur_dapm);
  
  			INIT_LIST_HEAD(&pending);
  			cur_sort = -1;
  			cur_subseq = INT_MIN;
  			cur_reg = SND_SOC_NOPM;
  			cur_dapm = NULL;
  		}
  
  		switch (w->id) {
  		case snd_soc_dapm_pre:
  			if (!w->event)
  				list_for_each_entry_safe_continue(w, n, list,
  								  power_list);
  
  			if (event == SND_SOC_DAPM_STREAM_START)
  				ret = w->event(w,
  					       NULL, SND_SOC_DAPM_PRE_PMU);
  			else if (event == SND_SOC_DAPM_STREAM_STOP)
  				ret = w->event(w,
  					       NULL, SND_SOC_DAPM_PRE_PMD);
  			break;
  
  		case snd_soc_dapm_post:
  			if (!w->event)
  				list_for_each_entry_safe_continue(w, n, list,
  								  power_list);
  
  			if (event == SND_SOC_DAPM_STREAM_START)
  				ret = w->event(w,
  					       NULL, SND_SOC_DAPM_POST_PMU);
  			else if (event == SND_SOC_DAPM_STREAM_STOP)
  				ret = w->event(w,
  					       NULL, SND_SOC_DAPM_POST_PMD);
  			break;
  
  		default:
  			/* Queue it up for application */
  			cur_sort = sort[w->id];
  			cur_subseq = w->subseq;
  			cur_reg = w->reg;
  			cur_dapm = w->dapm;
  			list_move(&w->power_list, &pending);
  			break;
  		}
  
  		if (ret < 0)
  			dev_err(w->dapm->dev,
  				"ASoC: Failed to apply widget power: %d\n", ret);
  	}
  
  	if (!list_empty(&pending))
  		dapm_seq_run_coalesced(card, &pending);
  
  	if (cur_dapm && cur_dapm->seq_notifier) {
  		for (i = 0; i < ARRAY_SIZE(dapm_up_seq); i++)
  			if (sort[i] == cur_sort)
  				cur_dapm->seq_notifier(cur_dapm,
  						       i, cur_subseq);
  	}
  
  	list_for_each_entry(d, &card->dapm_list, list) {
  		soc_dapm_async_complete(d);
  	}
  }
  
  static void dapm_widget_update(struct snd_soc_card *card)
  {
  	struct snd_soc_dapm_update *update = card->update;
  	struct snd_soc_dapm_widget_list *wlist;
  	struct snd_soc_dapm_widget *w = NULL;
  	unsigned int wi;
  	int ret;
  
  	if (!update || !dapm_kcontrol_is_powered(update->kcontrol))
  		return;
  
  	wlist = dapm_kcontrol_get_wlist(update->kcontrol);
  
  	for (wi = 0; wi < wlist->num_widgets; wi++) {
  		w = wlist->widgets[wi];
  
  		if (w->event && (w->event_flags & SND_SOC_DAPM_PRE_REG)) {
  			ret = w->event(w, update->kcontrol, SND_SOC_DAPM_PRE_REG);
  			if (ret != 0)
  				dev_err(w->dapm->dev, "ASoC: %s DAPM pre-event failed: %d\n",
  					   w->name, ret);
  		}
  	}
  
  	if (!w)
  		return;
  
  	ret = soc_widget_update_bits(w, update->reg, update->mask, update->val);
  	if (ret < 0)
  		dev_err(w->dapm->dev, "ASoC: %s DAPM update failed: %d\n",
  			w->name, ret);
  
  	for (wi = 0; wi < wlist->num_widgets; wi++) {
  		w = wlist->widgets[wi];
  
  		if (w->event && (w->event_flags & SND_SOC_DAPM_POST_REG)) {
  			ret = w->event(w, update->kcontrol, SND_SOC_DAPM_POST_REG);
  			if (ret != 0)
  				dev_err(w->dapm->dev, "ASoC: %s DAPM post-event failed: %d\n",
  					   w->name, ret);
  		}
  	}
  }
  
  /* Async callback run prior to DAPM sequences - brings to _PREPARE if
   * they're changing state.
   */
  static void dapm_pre_sequence_async(void *data, async_cookie_t cookie)
  {
  	struct snd_soc_dapm_context *d = data;
  	int ret;
  
  	/* If we're off and we're not supposed to be go into STANDBY */
  	if (d->bias_level == SND_SOC_BIAS_OFF &&
  	    d->target_bias_level != SND_SOC_BIAS_OFF) {
  		if (d->dev)
  			pm_runtime_get_sync(d->dev);
  
  		ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_STANDBY);
  		if (ret != 0)
  			dev_err(d->dev,
  				"ASoC: Failed to turn on bias: %d\n", ret);
  	}
  
  	/* Prepare for a transition to ON or away from ON */
  	if ((d->target_bias_level == SND_SOC_BIAS_ON &&
  	     d->bias_level != SND_SOC_BIAS_ON) ||
  	    (d->target_bias_level != SND_SOC_BIAS_ON &&
  	     d->bias_level == SND_SOC_BIAS_ON)) {
  		ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_PREPARE);
  		if (ret != 0)
  			dev_err(d->dev,
  				"ASoC: Failed to prepare bias: %d\n", ret);
  	}
  }
  
  /* Async callback run prior to DAPM sequences - brings to their final
   * state.
   */
  static void dapm_post_sequence_async(void *data, async_cookie_t cookie)
  {
  	struct snd_soc_dapm_context *d = data;
  	int ret;
  
  	/* If we just powered the last thing off drop to standby bias */
  	if (d->bias_level == SND_SOC_BIAS_PREPARE &&
  	    (d->target_bias_level == SND_SOC_BIAS_STANDBY ||
  	     d->target_bias_level == SND_SOC_BIAS_OFF)) {
  		ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_STANDBY);
  		if (ret != 0)
  			dev_err(d->dev, "ASoC: Failed to apply standby bias: %d\n",
  				ret);
  	}
  
  	/* If we're in standby and can support bias off then do that */
  	if (d->bias_level == SND_SOC_BIAS_STANDBY &&
  	    d->target_bias_level == SND_SOC_BIAS_OFF) {
  		ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_OFF);
  		if (ret != 0)
  			dev_err(d->dev, "ASoC: Failed to turn off bias: %d\n",
  				ret);
  
  		if (d->dev)
  			pm_runtime_put(d->dev);
  	}
  
  	/* If we just powered up then move to active bias */
  	if (d->bias_level == SND_SOC_BIAS_PREPARE &&
  	    d->target_bias_level == SND_SOC_BIAS_ON) {
  		ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_ON);
  		if (ret != 0)
  			dev_err(d->dev, "ASoC: Failed to apply active bias: %d\n",
  				ret);
  	}
  }
  
  static void dapm_widget_set_peer_power(struct snd_soc_dapm_widget *peer,
  				       bool power, bool connect)
  {
  	/* If a connection is being made or broken then that update
  	 * will have marked the peer dirty, otherwise the widgets are
  	 * not connected and this update has no impact. */
  	if (!connect)
  		return;
  
  	/* If the peer is already in the state we're moving to then we
  	 * won't have an impact on it. */
  	if (power != peer->power)
  		dapm_mark_dirty(peer, "peer state change");
  }
  
  static void dapm_widget_set_power(struct snd_soc_dapm_widget *w, bool power,
  				  struct list_head *up_list,
  				  struct list_head *down_list)
  {
  	struct snd_soc_dapm_path *path;
  
  	if (w->power == power)
  		return;
  
  	trace_snd_soc_dapm_widget_power(w, power);
  
  	/* If we changed our power state perhaps our neigbours changed
  	 * also.
  	 */
  	list_for_each_entry(path, &w->sources, list_sink) {
  		if (path->source) {
  			dapm_widget_set_peer_power(path->source, power,
  						   path->connect);
  		}
  	}
  	switch (w->id) {
  	case snd_soc_dapm_supply:
  	case snd_soc_dapm_regulator_supply:
  	case snd_soc_dapm_clock_supply:
  	case snd_soc_dapm_kcontrol:
  		/* Supplies can't affect their outputs, only their inputs */
  		break;
  	default:
  		list_for_each_entry(path, &w->sinks, list_source) {
  			if (path->sink) {
  				dapm_widget_set_peer_power(path->sink, power,
  							   path->connect);
  			}
  		}
  		break;
  	}
  
  	if (power)
  		dapm_seq_insert(w, up_list, true);
  	else
  		dapm_seq_insert(w, down_list, false);
  }
  
  static void dapm_power_one_widget(struct snd_soc_dapm_widget *w,
  				  struct list_head *up_list,
  				  struct list_head *down_list)
  {
  	int power;
  
  	switch (w->id) {
  	case snd_soc_dapm_pre:
  		dapm_seq_insert(w, down_list, false);
  		break;
  	case snd_soc_dapm_post:
  		dapm_seq_insert(w, up_list, true);
  		break;
  
  	default:
  		power = dapm_widget_power_check(w);
  
  		dapm_widget_set_power(w, power, up_list, down_list);
  		break;
  	}
  }
  
  /*
   * Scan each dapm widget for complete audio path.
   * A complete path is a route that has valid endpoints i.e.:-
   *
   *  o DAC to output pin.
   *  o Input Pin to ADC.
   *  o Input pin to Output pin (bypass, sidetone)
   *  o DAC to ADC (loopback).
   */
  static int dapm_power_widgets(struct snd_soc_card *card, int event)
  {
  	struct snd_soc_dapm_widget *w;
  	struct snd_soc_dapm_context *d;
  	LIST_HEAD(up_list);
  	LIST_HEAD(down_list);
  	ASYNC_DOMAIN_EXCLUSIVE(async_domain);
  	enum snd_soc_bias_level bias;
  
  	lockdep_assert_held(&card->dapm_mutex);
  
  	trace_snd_soc_dapm_start(card);
  
  	list_for_each_entry(d, &card->dapm_list, list) {
  		if (d->idle_bias_off)
  			d->target_bias_level = SND_SOC_BIAS_OFF;
  		else
  			d->target_bias_level = SND_SOC_BIAS_STANDBY;
  	}
  
  	dapm_reset(card);
  
  	/* Check which widgets we need to power and store them in
  	 * lists indicating if they should be powered up or down.  We
  	 * only check widgets that have been flagged as dirty but note
  	 * that new widgets may be added to the dirty list while we
  	 * iterate.
  	 */
  	list_for_each_entry(w, &card->dapm_dirty, dirty) {
  		dapm_power_one_widget(w, &up_list, &down_list);
  	}
  
  	list_for_each_entry(w, &card->widgets, list) {
  		switch (w->id) {
  		case snd_soc_dapm_pre:
  		case snd_soc_dapm_post:
  			/* These widgets always need to be powered */
  			break;
  		default:
  			list_del_init(&w->dirty);
  			break;
  		}
  
  		if (w->new_power) {
  			d = w->dapm;
  
  			/* Supplies and micbiases only bring the
  			 * context up to STANDBY as unless something
  			 * else is active and passing audio they
  			 * generally don't require full power.  Signal
  			 * generators are virtual pins and have no
  			 * power impact themselves.
  			 */
  			switch (w->id) {
  			case snd_soc_dapm_siggen:
  			case snd_soc_dapm_vmid:
  				break;
  			case snd_soc_dapm_supply:
  			case snd_soc_dapm_regulator_supply:
  			case snd_soc_dapm_clock_supply:
  			case snd_soc_dapm_micbias:
  				if (d->target_bias_level < SND_SOC_BIAS_STANDBY)
  					d->target_bias_level = SND_SOC_BIAS_STANDBY;
  				break;
  			default:
  				d->target_bias_level = SND_SOC_BIAS_ON;
  				break;
  			}
  		}
  
  	}
  
  	/* Force all contexts in the card to the same bias state if
  	 * they're not ground referenced.
  	 */
  	bias = SND_SOC_BIAS_OFF;
  	list_for_each_entry(d, &card->dapm_list, list)
  		if (d->target_bias_level > bias)
  			bias = d->target_bias_level;
  	list_for_each_entry(d, &card->dapm_list, list)
  		if (!d->idle_bias_off)
  			d->target_bias_level = bias;
  
  	trace_snd_soc_dapm_walk_done(card);
  
  	/* Run card bias changes at first */
  	dapm_pre_sequence_async(&card->dapm, 0);
  	/* Run other bias changes in parallel */
  	list_for_each_entry(d, &card->dapm_list, list) {
  		if (d != &card->dapm)
  			async_schedule_domain(dapm_pre_sequence_async, d,
  						&async_domain);
  	}
  	async_synchronize_full_domain(&async_domain);
  
  	list_for_each_entry(w, &down_list, power_list) {
  		dapm_seq_check_event(card, w, SND_SOC_DAPM_WILL_PMD);
  	}
  
  	list_for_each_entry(w, &up_list, power_list) {
  		dapm_seq_check_event(card, w, SND_SOC_DAPM_WILL_PMU);
  	}
  
  	/* Power down widgets first; try to avoid amplifying pops. */
  	dapm_seq_run(card, &down_list, event, false);
  
  	dapm_widget_update(card);
  
  	/* Now power up. */
  	dapm_seq_run(card, &up_list, event, true);
  
  	/* Run all the bias changes in parallel */
  	list_for_each_entry(d, &card->dapm_list, list) {
  		if (d != &card->dapm)
  			async_schedule_domain(dapm_post_sequence_async, d,
  						&async_domain);
  	}
  	async_synchronize_full_domain(&async_domain);
  	/* Run card bias changes at last */
  	dapm_post_sequence_async(&card->dapm, 0);
  
  	/* do we need to notify any clients that DAPM event is complete */
  	list_for_each_entry(d, &card->dapm_list, list) {
  		if (d->stream_event)
  			d->stream_event(d, event);
  	}
  
  	pop_dbg(card->dev, card->pop_time,
  		"DAPM sequencing finished, waiting %dms\n", card->pop_time);
  	pop_wait(card->pop_time);
  
  	trace_snd_soc_dapm_done(card);
  
  	return 0;
  }
  
  #ifdef CONFIG_DEBUG_FS
  static ssize_t dapm_widget_power_read_file(struct file *file,
  					   char __user *user_buf,
  					   size_t count, loff_t *ppos)
  {
  	struct snd_soc_dapm_widget *w = file->private_data;
  	char *buf;
  	int in, out;
  	ssize_t ret;
  	struct snd_soc_dapm_path *p = NULL;
  
  	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
  	if (!buf)
  		return -ENOMEM;
  
  	in = is_connected_input_ep(w, NULL);
  	dapm_clear_walk_input(w->dapm, &w->sources);
  	out = is_connected_output_ep(w, NULL);
  	dapm_clear_walk_output(w->dapm, &w->sinks);
  
  	ret = snprintf(buf, PAGE_SIZE, "%s: %s%s  in %d out %d",
  		       w->name, w->power ? "On" : "Off",
  		       w->force ? " (forced)" : "", in, out);
  
  	if (w->reg >= 0)
  		ret += snprintf(buf + ret, PAGE_SIZE - ret,
  				" - R%d(0x%x) mask 0x%x",
  				w->reg, w->reg, w->mask << w->shift);
  
  	ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
  
  	if (w->sname)
  		ret += snprintf(buf + ret, PAGE_SIZE - ret, " stream %s %s\n",
  				w->sname,
  				w->active ? "active" : "inactive");
  
  	list_for_each_entry(p, &w->sources, list_sink) {
  		if (p->connected && !p->connected(w, p->source))
  			continue;
  
  		if (p->connect)
  			ret += snprintf(buf + ret, PAGE_SIZE - ret,
  					" in  \"%s\" \"%s\"\n",
  					p->name ? p->name : "static",
  					p->source->name);
  	}
  	list_for_each_entry(p, &w->sinks, list_source) {
  		if (p->connected && !p->connected(w, p->sink))
  			continue;
  
  		if (p->connect)
  			ret += snprintf(buf + ret, PAGE_SIZE - ret,
  					" out \"%s\" \"%s\"\n",
  					p->name ? p->name : "static",
  					p->sink->name);
  	}
  
  	ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
  
  	kfree(buf);
  	return ret;
  }
  
  static const struct file_operations dapm_widget_power_fops = {
  	.open = simple_open,
  	.read = dapm_widget_power_read_file,
  	.llseek = default_llseek,
  };
  
  static ssize_t dapm_bias_read_file(struct file *file, char __user *user_buf,
  				   size_t count, loff_t *ppos)
  {
  	struct snd_soc_dapm_context *dapm = file->private_data;
  	char *level;
  
  	switch (dapm->bias_level) {
  	case SND_SOC_BIAS_ON:
  		level = "On\n";
  		break;
  	case SND_SOC_BIAS_PREPARE:
  		level = "Prepare\n";
  		break;
  	case SND_SOC_BIAS_STANDBY:
  		level = "Standby\n";
  		break;
  	case SND_SOC_BIAS_OFF:
  		level = "Off\n";
  		break;
  	default:
  		WARN(1, "Unknown bias_level %d\n", dapm->bias_level);
  		level = "Unknown\n";
  		break;
  	}
  
  	return simple_read_from_buffer(user_buf, count, ppos, level,
  				       strlen(level));
  }
  
  static const struct file_operations dapm_bias_fops = {
  	.open = simple_open,
  	.read = dapm_bias_read_file,
  	.llseek = default_llseek,
  };
  
  void snd_soc_dapm_debugfs_init(struct snd_soc_dapm_context *dapm,
  	struct dentry *parent)
  {
  	struct dentry *d;
  
  	dapm->debugfs_dapm = debugfs_create_dir("dapm", parent);
  
  	if (!dapm->debugfs_dapm) {
  		dev_warn(dapm->dev,
  		       "ASoC: Failed to create DAPM debugfs directory\n");
  		return;
  	}
  
  	d = debugfs_create_file("bias_level", 0444,
  				dapm->debugfs_dapm, dapm,
  				&dapm_bias_fops);
  	if (!d)
  		dev_warn(dapm->dev,
  			 "ASoC: Failed to create bias level debugfs file\n");
  }
  
  static void dapm_debugfs_add_widget(struct snd_soc_dapm_widget *w)
  {
  	struct snd_soc_dapm_context *dapm = w->dapm;
  	struct dentry *d;
  
  	if (!dapm->debugfs_dapm || !w->name)
  		return;
  
  	d = debugfs_create_file(w->name, 0444,
  				dapm->debugfs_dapm, w,
  				&dapm_widget_power_fops);
  	if (!d)
  		dev_warn(w->dapm->dev,
  			"ASoC: Failed to create %s debugfs file\n",
  			w->name);
  }
  
  static void dapm_debugfs_cleanup(struct snd_soc_dapm_context *dapm)
  {
  	debugfs_remove_recursive(dapm->debugfs_dapm);
  }
  
  #else
  void snd_soc_dapm_debugfs_init(struct snd_soc_dapm_context *dapm,
  	struct dentry *parent)
  {
  }
  
  static inline void dapm_debugfs_add_widget(struct snd_soc_dapm_widget *w)
  {
  }
  
  static inline void dapm_debugfs_cleanup(struct snd_soc_dapm_context *dapm)
  {
  }
  
  #endif
  
  /* test and update the power status of a mux widget */
  static int soc_dapm_mux_update_power(struct snd_soc_card *card,
  				 struct snd_kcontrol *kcontrol, int mux, struct soc_enum *e)
  {
  	struct snd_soc_dapm_path *path;
  	int found = 0;
  
  	lockdep_assert_held(&card->dapm_mutex);
  
  	/* find dapm widget path assoc with kcontrol */
  	dapm_kcontrol_for_each_path(path, kcontrol) {
  		if (!path->name || !e->texts[mux])
  			continue;
  
  		found = 1;
  		/* we now need to match the string in the enum to the path */
  		if (!(strcmp(path->name, e->texts[mux]))) {
  			path->connect = 1; /* new connection */
  			dapm_mark_dirty(path->source, "mux connection");
  		} else {
  			if (path->connect)
  				dapm_mark_dirty(path->source,
  						"mux disconnection");
  			path->connect = 0; /* old connection must be powered down */
  		}
  		dapm_mark_dirty(path->sink, "mux change");
  	}
  
  	if (found)
  		dapm_power_widgets(card, SND_SOC_DAPM_STREAM_NOP);
  
  	return found;
  }
  
  int snd_soc_dapm_mux_update_power(struct snd_soc_dapm_context *dapm,
  	struct snd_kcontrol *kcontrol, int mux, struct soc_enum *e,
  	struct snd_soc_dapm_update *update)
  {
  	struct snd_soc_card *card = dapm->card;
  	int ret;
  
  	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
  	card->update = update;
  	ret = soc_dapm_mux_update_power(card, kcontrol, mux, e);
  	card->update = NULL;
  	mutex_unlock(&card->dapm_mutex);
  	if (ret > 0)
  		soc_dpcm_runtime_update(card);
  	return ret;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_mux_update_power);
  
  /* test and update the power status of a mixer or switch widget */
  static int soc_dapm_mixer_update_power(struct snd_soc_card *card,
  				   struct snd_kcontrol *kcontrol, int connect)
  {
  	struct snd_soc_dapm_path *path;
  	int found = 0;
  
  	lockdep_assert_held(&card->dapm_mutex);
  
  	/* find dapm widget path assoc with kcontrol */
  	dapm_kcontrol_for_each_path(path, kcontrol) {
  		found = 1;
  		path->connect = connect;
  		dapm_mark_dirty(path->source, "mixer connection");
  		dapm_mark_dirty(path->sink, "mixer update");
  	}
  
  	if (found)
  		dapm_power_widgets(card, SND_SOC_DAPM_STREAM_NOP);
  
  	return found;
  }
  
  int snd_soc_dapm_mixer_update_power(struct snd_soc_dapm_context *dapm,
  	struct snd_kcontrol *kcontrol, int connect,
  	struct snd_soc_dapm_update *update)
  {
  	struct snd_soc_card *card = dapm->card;
  	int ret;
  
  	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
  	card->update = update;
  	ret = soc_dapm_mixer_update_power(card, kcontrol, connect);
  	card->update = NULL;
  	mutex_unlock(&card->dapm_mutex);
  	if (ret > 0)
  		soc_dpcm_runtime_update(card);
  	return ret;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_mixer_update_power);
  
  /* show dapm widget status in sys fs */
  static ssize_t dapm_widget_show(struct device *dev,
  	struct device_attribute *attr, char *buf)
  {
  	struct snd_soc_pcm_runtime *rtd = dev_get_drvdata(dev);
  	struct snd_soc_codec *codec =rtd->codec;
  	struct snd_soc_dapm_widget *w;
  	int count = 0;
  	char *state = "not set";
  
  	list_for_each_entry(w, &codec->card->widgets, list) {
  		if (w->dapm != &codec->dapm)
  			continue;
  
  		/* only display widgets that burnm power */
  		switch (w->id) {
  		case snd_soc_dapm_hp:
  		case snd_soc_dapm_mic:
  		case snd_soc_dapm_spk:
  		case snd_soc_dapm_line:
  		case snd_soc_dapm_micbias:
  		case snd_soc_dapm_dac:
  		case snd_soc_dapm_adc:
  		case snd_soc_dapm_pga:
  		case snd_soc_dapm_out_drv:
  		case snd_soc_dapm_mixer:
  		case snd_soc_dapm_mixer_named_ctl:
  		case snd_soc_dapm_supply:
  		case snd_soc_dapm_regulator_supply:
  		case snd_soc_dapm_clock_supply:
  			if (w->name)
  				count += sprintf(buf + count, "%s: %s\n",
  					w->name, w->power ? "On":"Off");
  		break;
  		default:
  		break;
  		}
  	}
  
  	switch (codec->dapm.bias_level) {
  	case SND_SOC_BIAS_ON:
  		state = "On";
  		break;
  	case SND_SOC_BIAS_PREPARE:
  		state = "Prepare";
  		break;
  	case SND_SOC_BIAS_STANDBY:
  		state = "Standby";
  		break;
  	case SND_SOC_BIAS_OFF:
  		state = "Off";
  		break;
  	}
  	count += sprintf(buf + count, "PM State: %s\n", state);
  
  	return count;
  }
  
  static DEVICE_ATTR(dapm_widget, 0444, dapm_widget_show, NULL);
  
  int snd_soc_dapm_sys_add(struct device *dev)
  {
  	return device_create_file(dev, &dev_attr_dapm_widget);
  }
  
  static void snd_soc_dapm_sys_remove(struct device *dev)
  {
  	device_remove_file(dev, &dev_attr_dapm_widget);
  }
  
  static void dapm_free_path(struct snd_soc_dapm_path *path)
  {
  	list_del(&path->list_sink);
  	list_del(&path->list_source);
  	list_del(&path->list_kcontrol);
  	list_del(&path->list);
  	kfree(path);
  }
  
  /* free all dapm widgets and resources */
  static void dapm_free_widgets(struct snd_soc_dapm_context *dapm)
  {
  	struct snd_soc_dapm_widget *w, *next_w;
  	struct snd_soc_dapm_path *p, *next_p;
  
  	list_for_each_entry_safe(w, next_w, &dapm->card->widgets, list) {
  		if (w->dapm != dapm)
  			continue;
  		list_del(&w->list);
  		/*
  		 * remove source and sink paths associated to this widget.
  		 * While removing the path, remove reference to it from both
  		 * source and sink widgets so that path is removed only once.
  		 */
  		list_for_each_entry_safe(p, next_p, &w->sources, list_sink)
  			dapm_free_path(p);
  
  		list_for_each_entry_safe(p, next_p, &w->sinks, list_source)
  			dapm_free_path(p);
  
  		kfree(w->kcontrols);
  		kfree(w->name);
  		kfree(w);
  	}
  }
  
  static struct snd_soc_dapm_widget *dapm_find_widget(
  			struct snd_soc_dapm_context *dapm, const char *pin,
  			bool search_other_contexts)
  {
  	struct snd_soc_dapm_widget *w;
  	struct snd_soc_dapm_widget *fallback = NULL;
  
  	list_for_each_entry(w, &dapm->card->widgets, list) {
  		if (!strcmp(w->name, pin)) {
  			if (w->dapm == dapm)
  				return w;
  			else
  				fallback = w;
  		}
  	}
  
  	if (search_other_contexts)
  		return fallback;
  
  	return NULL;
  }
  
  static int snd_soc_dapm_set_pin(struct snd_soc_dapm_context *dapm,
  				const char *pin, int status)
  {
  	struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);
  
  	dapm_assert_locked(dapm);
  
  	if (!w) {
  		dev_err(dapm->dev, "ASoC: DAPM unknown pin %s\n", pin);
  		return -EINVAL;
  	}
  
  	if (w->connected != status)
  		dapm_mark_dirty(w, "pin configuration");
  
  	w->connected = status;
  	if (status == 0)
  		w->force = 0;
  
  	return 0;
  }
  
  /**
   * snd_soc_dapm_sync_unlocked - scan and power dapm paths
   * @dapm: DAPM context
   *
   * Walks all dapm audio paths and powers widgets according to their
   * stream or path usage.
   *
   * Requires external locking.
   *
   * Returns 0 for success.
   */
  int snd_soc_dapm_sync_unlocked(struct snd_soc_dapm_context *dapm)
  {
  	/*
  	 * Suppress early reports (eg, jacks syncing their state) to avoid
  	 * silly DAPM runs during card startup.
  	 */
  	if (!dapm->card || !dapm->card->instantiated)
  		return 0;
  
  	return dapm_power_widgets(dapm->card, SND_SOC_DAPM_STREAM_NOP);
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_sync_unlocked);
  
  /**
   * snd_soc_dapm_sync - scan and power dapm paths
   * @dapm: DAPM context
   *
   * Walks all dapm audio paths and powers widgets according to their
   * stream or path usage.
   *
   * Returns 0 for success.
   */
  int snd_soc_dapm_sync(struct snd_soc_dapm_context *dapm)
  {
  	int ret;
  
  	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
  	ret = snd_soc_dapm_sync_unlocked(dapm);
  	mutex_unlock(&dapm->card->dapm_mutex);
  	return ret;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_sync);
  
  static int snd_soc_dapm_add_path(struct snd_soc_dapm_context *dapm,
  	struct snd_soc_dapm_widget *wsource, struct snd_soc_dapm_widget *wsink,
  	const char *control,
  	int (*connected)(struct snd_soc_dapm_widget *source,
  			 struct snd_soc_dapm_widget *sink))
  {
  	struct snd_soc_dapm_path *path;
  	int ret;
  
  	path = kzalloc(sizeof(struct snd_soc_dapm_path), GFP_KERNEL);
  	if (!path)
  		return -ENOMEM;
  
  	path->source = wsource;
  	path->sink = wsink;
  	path->connected = connected;
  	INIT_LIST_HEAD(&path->list);
  	INIT_LIST_HEAD(&path->list_kcontrol);
  	INIT_LIST_HEAD(&path->list_source);
  	INIT_LIST_HEAD(&path->list_sink);
  
  	/* check for external widgets */
  	if (wsink->id == snd_soc_dapm_input) {
  		if (wsource->id == snd_soc_dapm_micbias ||
  			wsource->id == snd_soc_dapm_mic ||
  			wsource->id == snd_soc_dapm_line ||
  			wsource->id == snd_soc_dapm_output)
  			wsink->ext = 1;
  	}
  	if (wsource->id == snd_soc_dapm_output) {
  		if (wsink->id == snd_soc_dapm_spk ||
  			wsink->id == snd_soc_dapm_hp ||
  			wsink->id == snd_soc_dapm_line ||
  			wsink->id == snd_soc_dapm_input)
  			wsource->ext = 1;
  	}
  
  	dapm_mark_dirty(wsource, "Route added");
  	dapm_mark_dirty(wsink, "Route added");
  
  	/* connect static paths */
  	if (control == NULL) {
  		list_add(&path->list, &dapm->card->paths);
  		list_add(&path->list_sink, &wsink->sources);
  		list_add(&path->list_source, &wsource->sinks);
  		path->connect = 1;
  		return 0;
  	}
  
  	/* connect dynamic paths */
  	switch (wsink->id) {
  	case snd_soc_dapm_adc:
  	case snd_soc_dapm_dac:
  	case snd_soc_dapm_pga:
  	case snd_soc_dapm_out_drv:
  	case snd_soc_dapm_input:
  	case snd_soc_dapm_output:
  	case snd_soc_dapm_siggen:
  	case snd_soc_dapm_micbias:
  	case snd_soc_dapm_vmid:
  	case snd_soc_dapm_pre:
  	case snd_soc_dapm_post:
  	case snd_soc_dapm_supply:
  	case snd_soc_dapm_regulator_supply:
  	case snd_soc_dapm_clock_supply:
  	case snd_soc_dapm_aif_in:
  	case snd_soc_dapm_aif_out:
  	case snd_soc_dapm_dai_in:
  	case snd_soc_dapm_dai_out:
  	case snd_soc_dapm_dai_link:
  	case snd_soc_dapm_kcontrol:
  		list_add(&path->list, &dapm->card->paths);
  		list_add(&path->list_sink, &wsink->sources);
  		list_add(&path->list_source, &wsource->sinks);
  		path->connect = 1;
  		return 0;
  	case snd_soc_dapm_mux:
  		ret = dapm_connect_mux(dapm, wsource, wsink, path, control,
  			&wsink->kcontrol_news[0]);
  		if (ret != 0)
  			goto err;
  		break;
  	case snd_soc_dapm_switch:
  	case snd_soc_dapm_mixer:
  	case snd_soc_dapm_mixer_named_ctl:
  		ret = dapm_connect_mixer(dapm, wsource, wsink, path, control);
  		if (ret != 0)
  			goto err;
  		break;
  	case snd_soc_dapm_hp:
  	case snd_soc_dapm_mic:
  	case snd_soc_dapm_line:
  	case snd_soc_dapm_spk:
  		list_add(&path->list, &dapm->card->paths);
  		list_add(&path->list_sink, &wsink->sources);
  		list_add(&path->list_source, &wsource->sinks);
  		path->connect = 0;
  		return 0;
  	}
  
  	return 0;
  err:
  	kfree(path);
  	return ret;
  }
  
  static int snd_soc_dapm_add_route(struct snd_soc_dapm_context *dapm,
  				  const struct snd_soc_dapm_route *route)
  {
  	struct snd_soc_dapm_widget *wsource = NULL, *wsink = NULL, *w;
  	struct snd_soc_dapm_widget *wtsource = NULL, *wtsink = NULL;
  	const char *sink;
  	const char *source;
  	char prefixed_sink[80];
  	char prefixed_source[80];
  	int ret;
  
  	if (dapm->codec && dapm->codec->name_prefix) {
  		snprintf(prefixed_sink, sizeof(prefixed_sink), "%s %s",
  			 dapm->codec->name_prefix, route->sink);
  		sink = prefixed_sink;
  		snprintf(prefixed_source, sizeof(prefixed_source), "%s %s",
  			 dapm->codec->name_prefix, route->source);
  		source = prefixed_source;
  	} else {
  		sink = route->sink;
  		source = route->source;
  	}
  
  	/*
  	 * find src and dest widgets over all widgets but favor a widget from
  	 * current DAPM context
  	 */
  	list_for_each_entry(w, &dapm->card->widgets, list) {
  		if (!wsink && !(strcmp(w->name, sink))) {
  			wtsink = w;
  			if (w->dapm == dapm)
  				wsink = w;
  			continue;
  		}
  		if (!wsource && !(strcmp(w->name, source))) {
  			wtsource = w;
  			if (w->dapm == dapm)
  				wsource = w;
  		}
  	}
  	/* use widget from another DAPM context if not found from this */
  	if (!wsink)
  		wsink = wtsink;
  	if (!wsource)
  		wsource = wtsource;
  
  	if (wsource == NULL) {
  		dev_err(dapm->dev, "ASoC: no source widget found for %s\n",
  			route->source);
  		return -ENODEV;
  	}
  	if (wsink == NULL) {
  		dev_err(dapm->dev, "ASoC: no sink widget found for %s\n",
  			route->sink);
  		return -ENODEV;
  	}
  
  	ret = snd_soc_dapm_add_path(dapm, wsource, wsink, route->control,
  		route->connected);
  	if (ret)
  		goto err;
  
  	return 0;
  err:
  	dev_warn(dapm->dev, "ASoC: no dapm match for %s --> %s --> %s\n",
  		 source, route->control, sink);
  	return ret;
  }
  
  static int snd_soc_dapm_del_route(struct snd_soc_dapm_context *dapm,
  				  const struct snd_soc_dapm_route *route)
  {
  	struct snd_soc_dapm_path *path, *p;
  	const char *sink;
  	const char *source;
  	char prefixed_sink[80];
  	char prefixed_source[80];
  
  	if (route->control) {
  		dev_err(dapm->dev,
  			"ASoC: Removal of routes with controls not supported\n");
  		return -EINVAL;
  	}
  
  	if (dapm->codec && dapm->codec->name_prefix) {
  		snprintf(prefixed_sink, sizeof(prefixed_sink), "%s %s",
  			 dapm->codec->name_prefix, route->sink);
  		sink = prefixed_sink;
  		snprintf(prefixed_source, sizeof(prefixed_source), "%s %s",
  			 dapm->codec->name_prefix, route->source);
  		source = prefixed_source;
  	} else {
  		sink = route->sink;
  		source = route->source;
  	}
  
  	path = NULL;
  	list_for_each_entry(p, &dapm->card->paths, list) {
  		if (strcmp(p->source->name, source) != 0)
  			continue;
  		if (strcmp(p->sink->name, sink) != 0)
  			continue;
  		path = p;
  		break;
  	}
  
  	if (path) {
  		dapm_mark_dirty(path->source, "Route removed");
  		dapm_mark_dirty(path->sink, "Route removed");
  
  		dapm_free_path(path);
  	} else {
  		dev_warn(dapm->dev, "ASoC: Route %s->%s does not exist\n",
  			 source, sink);
  	}
  
  	return 0;
  }
  
  /**
   * snd_soc_dapm_add_routes - Add routes between DAPM widgets
   * @dapm: DAPM context
   * @route: audio routes
   * @num: number of routes
   *
   * Connects 2 dapm widgets together via a named audio path. The sink is
   * the widget receiving the audio signal, whilst the source is the sender
   * of the audio signal.
   *
   * Returns 0 for success else error. On error all resources can be freed
   * with a call to snd_soc_card_free().
   */
  int snd_soc_dapm_add_routes(struct snd_soc_dapm_context *dapm,
  			    const struct snd_soc_dapm_route *route, int num)
  {
  	int i, r, ret = 0;
  
  	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
  	for (i = 0; i < num; i++) {
  		r = snd_soc_dapm_add_route(dapm, route);
  		if (r < 0) {
  			dev_err(dapm->dev, "ASoC: Failed to add route %s -> %s -> %s\n",
  				route->source,
  				route->control ? route->control : "direct",
  				route->sink);
  			ret = r;
  		}
  		route++;
  	}
  	mutex_unlock(&dapm->card->dapm_mutex);
  
  	return ret;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_add_routes);
  
  /**
   * snd_soc_dapm_del_routes - Remove routes between DAPM widgets
   * @dapm: DAPM context
   * @route: audio routes
   * @num: number of routes
   *
   * Removes routes from the DAPM context.
   */
  int snd_soc_dapm_del_routes(struct snd_soc_dapm_context *dapm,
  			    const struct snd_soc_dapm_route *route, int num)
  {
  	int i, ret = 0;
  
  	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
  	for (i = 0; i < num; i++) {
  		snd_soc_dapm_del_route(dapm, route);
  		route++;
  	}
  	mutex_unlock(&dapm->card->dapm_mutex);
  
  	return ret;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_del_routes);
  
  static int snd_soc_dapm_weak_route(struct snd_soc_dapm_context *dapm,
  				   const struct snd_soc_dapm_route *route)
  {
  	struct snd_soc_dapm_widget *source = dapm_find_widget(dapm,
  							      route->source,
  							      true);
  	struct snd_soc_dapm_widget *sink = dapm_find_widget(dapm,
  							    route->sink,
  							    true);
  	struct snd_soc_dapm_path *path;
  	int count = 0;
  
  	if (!source) {
  		dev_err(dapm->dev, "ASoC: Unable to find source %s for weak route\n",
  			route->source);
  		return -ENODEV;
  	}
  
  	if (!sink) {
  		dev_err(dapm->dev, "ASoC: Unable to find sink %s for weak route\n",
  			route->sink);
  		return -ENODEV;
  	}
  
  	if (route->control || route->connected)
  		dev_warn(dapm->dev, "ASoC: Ignoring control for weak route %s->%s\n",
  			 route->source, route->sink);
  
  	list_for_each_entry(path, &source->sinks, list_source) {
  		if (path->sink == sink) {
  			path->weak = 1;
  			count++;
  		}
  	}
  
  	if (count == 0)
  		dev_err(dapm->dev, "ASoC: No path found for weak route %s->%s\n",
  			route->source, route->sink);
  	if (count > 1)
  		dev_warn(dapm->dev, "ASoC: %d paths found for weak route %s->%s\n",
  			 count, route->source, route->sink);
  
  	return 0;
  }
  
  /**
   * snd_soc_dapm_weak_routes - Mark routes between DAPM widgets as weak
   * @dapm: DAPM context
   * @route: audio routes
   * @num: number of routes
   *
   * Mark existing routes matching those specified in the passed array
   * as being weak, meaning that they are ignored for the purpose of
   * power decisions.  The main intended use case is for sidetone paths
   * which couple audio between other independent paths if they are both
   * active in order to make the combination work better at the user
   * level but which aren't intended to be "used".
   *
   * Note that CODEC drivers should not use this as sidetone type paths
   * can frequently also be used as bypass paths.
   */
  int snd_soc_dapm_weak_routes(struct snd_soc_dapm_context *dapm,
  			     const struct snd_soc_dapm_route *route, int num)
  {
  	int i, err;
  	int ret = 0;
  
  	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
  	for (i = 0; i < num; i++) {
  		err = snd_soc_dapm_weak_route(dapm, route);
  		if (err)
  			ret = err;
  		route++;
  	}
  	mutex_unlock(&dapm->card->dapm_mutex);
  
  	return ret;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_weak_routes);
  
  /**
   * snd_soc_dapm_new_widgets - add new dapm widgets
   * @dapm: DAPM context
   *
   * Checks the codec for any new dapm widgets and creates them if found.
   *
   * Returns 0 for success.
   */
  int snd_soc_dapm_new_widgets(struct snd_soc_card *card)
  {
  	struct snd_soc_dapm_widget *w;
  	unsigned int val;
  
  	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
  
  	list_for_each_entry(w, &card->widgets, list)
  	{
  		if (w->new)
  			continue;
  
  		if (w->num_kcontrols) {
  			w->kcontrols = kzalloc(w->num_kcontrols *
  						sizeof(struct snd_kcontrol *),
  						GFP_KERNEL);
  			if (!w->kcontrols) {
  				mutex_unlock(&card->dapm_mutex);
  				return -ENOMEM;
  			}
  		}
  
  		switch(w->id) {
  		case snd_soc_dapm_switch:
  		case snd_soc_dapm_mixer:
  		case snd_soc_dapm_mixer_named_ctl:
  			dapm_new_mixer(w);
  			break;
  		case snd_soc_dapm_mux:
  			dapm_new_mux(w);
  			break;
  		case snd_soc_dapm_pga:
  		case snd_soc_dapm_out_drv:
  			dapm_new_pga(w);
  			break;
  		default:
  			break;
  		}
  
  		/* Read the initial power state from the device */
  		if (w->reg >= 0) {
  			soc_widget_read(w, w->reg, &val);
  			val = val >> w->shift;
  			val &= w->mask;
  			if (val == w->on_val)
  				w->power = 1;
  		}
  
  		w->new = 1;
  
  		dapm_mark_dirty(w, "new widget");
  		dapm_debugfs_add_widget(w);
  	}
  
  	dapm_power_widgets(card, SND_SOC_DAPM_STREAM_NOP);
  	mutex_unlock(&card->dapm_mutex);
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_new_widgets);
  
  /**
   * snd_soc_dapm_get_volsw - dapm mixer get callback
   * @kcontrol: mixer control
   * @ucontrol: control element information
   *
   * Callback to get the value of a dapm mixer control.
   *
   * Returns 0 for success.
   */
  int snd_soc_dapm_get_volsw(struct snd_kcontrol *kcontrol,
  	struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_soc_codec *codec = snd_soc_dapm_kcontrol_codec(kcontrol);
  	struct snd_soc_card *card = codec->card;
  	struct soc_mixer_control *mc =
  		(struct soc_mixer_control *)kcontrol->private_value;
  	int reg = mc->reg;
  	unsigned int shift = mc->shift;
  	int max = mc->max;
  	unsigned int mask = (1 << fls(max)) - 1;
  	unsigned int invert = mc->invert;
  	unsigned int val;
  
  	if (snd_soc_volsw_is_stereo(mc))
  		dev_warn(codec->dapm.dev,
  			 "ASoC: Control '%s' is stereo, which is not supported\n",
  			 kcontrol->id.name);
  
  	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
  	if (dapm_kcontrol_is_powered(kcontrol) && reg != SND_SOC_NOPM)
  		val = (snd_soc_read(codec, reg) >> shift) & mask;
  	else
  		val = dapm_kcontrol_get_value(kcontrol);
  	mutex_unlock(&card->dapm_mutex);
  
  	if (invert)
  		ucontrol->value.integer.value[0] = max - val;
  	else
  		ucontrol->value.integer.value[0] = val;
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_get_volsw);
  
  /**
   * snd_soc_dapm_put_volsw - dapm mixer set callback
   * @kcontrol: mixer control
   * @ucontrol: control element information
   *
   * Callback to set the value of a dapm mixer control.
   *
   * Returns 0 for success.
   */
  int snd_soc_dapm_put_volsw(struct snd_kcontrol *kcontrol,
  	struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_soc_codec *codec = snd_soc_dapm_kcontrol_codec(kcontrol);
  	struct snd_soc_card *card = codec->card;
  	struct soc_mixer_control *mc =
  		(struct soc_mixer_control *)kcontrol->private_value;
  	int reg = mc->reg;
  	unsigned int shift = mc->shift;
  	int max = mc->max;
  	unsigned int mask = (1 << fls(max)) - 1;
  	unsigned int invert = mc->invert;
  	unsigned int val;
  	int connect, change, reg_change = 0;
  	struct snd_soc_dapm_update update;
  	int ret = 0;
  
  	if (snd_soc_volsw_is_stereo(mc))
  		dev_warn(codec->dapm.dev,
  			 "ASoC: Control '%s' is stereo, which is not supported\n",
  			 kcontrol->id.name);
  
  	val = (ucontrol->value.integer.value[0] & mask);
  	connect = !!val;
  
  	if (invert)
  		val = max - val;
  
  	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
  
  	change = dapm_kcontrol_set_value(kcontrol, val);
  
  	if (reg != SND_SOC_NOPM) {
  		mask = mask << shift;
  		val = val << shift;
  
  		reg_change = snd_soc_test_bits(codec, reg, mask, val);
  	}
  
  	if (change || reg_change) {
  		if (reg_change) {
  			update.kcontrol = kcontrol;
  			update.reg = reg;
  			update.mask = mask;
  			update.val = val;
  			card->update = &update;
  		}
  		change |= reg_change;
  
  		ret = soc_dapm_mixer_update_power(card, kcontrol, connect);
  
  		card->update = NULL;
  	}
  
  	mutex_unlock(&card->dapm_mutex);
  
  	if (ret > 0)
  		soc_dpcm_runtime_update(card);
  
  	return change;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_put_volsw);
  
  /**
   * snd_soc_dapm_get_enum_double - dapm enumerated double mixer get callback
   * @kcontrol: mixer control
   * @ucontrol: control element information
   *
   * Callback to get the value of a dapm enumerated double mixer control.
   *
   * Returns 0 for success.
   */
  int snd_soc_dapm_get_enum_double(struct snd_kcontrol *kcontrol,
  	struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_soc_codec *codec = snd_soc_dapm_kcontrol_codec(kcontrol);
  	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
  	unsigned int reg_val, val;
  
  	if (e->reg != SND_SOC_NOPM)
  		reg_val = snd_soc_read(codec, e->reg);
  	else
  		reg_val = dapm_kcontrol_get_value(kcontrol);
  
  	val = (reg_val >> e->shift_l) & e->mask;
  	ucontrol->value.enumerated.item[0] = snd_soc_enum_val_to_item(e, val);
  	if (e->shift_l != e->shift_r) {
  		val = (reg_val >> e->shift_r) & e->mask;
  		val = snd_soc_enum_val_to_item(e, val);
  		ucontrol->value.enumerated.item[1] = val;
  	}
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_get_enum_double);
  
  /**
   * snd_soc_dapm_put_enum_double - dapm enumerated double mixer set callback
   * @kcontrol: mixer control
   * @ucontrol: control element information
   *
   * Callback to set the value of a dapm enumerated double mixer control.
   *
   * Returns 0 for success.
   */
  int snd_soc_dapm_put_enum_double(struct snd_kcontrol *kcontrol,
  	struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_soc_codec *codec = snd_soc_dapm_kcontrol_codec(kcontrol);
  	struct snd_soc_card *card = codec->card;
  	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
  	unsigned int *item = ucontrol->value.enumerated.item;
  	unsigned int val, change;
  	unsigned int mask;
  	struct snd_soc_dapm_update update;
  	int ret = 0;
  
  	if (item[0] >= e->items)
  		return -EINVAL;
  
  	val = snd_soc_enum_item_to_val(e, item[0]) << e->shift_l;
  	mask = e->mask << e->shift_l;
  	if (e->shift_l != e->shift_r) {
  		if (item[1] > e->items)
  			return -EINVAL;
  		val |= snd_soc_enum_item_to_val(e, item[1]) << e->shift_l;
  		mask |= e->mask << e->shift_r;
  	}
  
  	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
  
  	if (e->reg != SND_SOC_NOPM)
  		change = snd_soc_test_bits(codec, e->reg, mask, val);
  	else
  		change = dapm_kcontrol_set_value(kcontrol, val);
  
  	if (change) {
  		if (e->reg != SND_SOC_NOPM) {
  			update.kcontrol = kcontrol;
  			update.reg = e->reg;
  			update.mask = mask;
  			update.val = val;
  			card->update = &update;
  		}
  
  		ret = soc_dapm_mux_update_power(card, kcontrol, item[0], e);
  
  		card->update = NULL;
  	}
  
  	mutex_unlock(&card->dapm_mutex);
  
  	if (ret > 0)
  		soc_dpcm_runtime_update(card);
  
  	return change;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_put_enum_double);
  
  /**
   * snd_soc_dapm_info_pin_switch - Info for a pin switch
   *
   * @kcontrol: mixer control
   * @uinfo: control element information
   *
   * Callback to provide information about a pin switch control.
   */
  int snd_soc_dapm_info_pin_switch(struct snd_kcontrol *kcontrol,
  				 struct snd_ctl_elem_info *uinfo)
  {
  	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
  	uinfo->count = 1;
  	uinfo->value.integer.min = 0;
  	uinfo->value.integer.max = 1;
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_info_pin_switch);
  
  /**
   * snd_soc_dapm_get_pin_switch - Get information for a pin switch
   *
   * @kcontrol: mixer control
   * @ucontrol: Value
   */
  int snd_soc_dapm_get_pin_switch(struct snd_kcontrol *kcontrol,
  				struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
  	const char *pin = (const char *)kcontrol->private_value;
  
  	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
  
  	ucontrol->value.integer.value[0] =
  		snd_soc_dapm_get_pin_status(&card->dapm, pin);
  
  	mutex_unlock(&card->dapm_mutex);
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_get_pin_switch);
  
  /**
   * snd_soc_dapm_put_pin_switch - Set information for a pin switch
   *
   * @kcontrol: mixer control
   * @ucontrol: Value
   */
  int snd_soc_dapm_put_pin_switch(struct snd_kcontrol *kcontrol,
  				struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
  	const char *pin = (const char *)kcontrol->private_value;
  
  	if (ucontrol->value.integer.value[0])
  		snd_soc_dapm_enable_pin(&card->dapm, pin);
  	else
  		snd_soc_dapm_disable_pin(&card->dapm, pin);
  
  	snd_soc_dapm_sync(&card->dapm);
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_put_pin_switch);
  
  static struct snd_soc_dapm_widget *
  snd_soc_dapm_new_control(struct snd_soc_dapm_context *dapm,
  			 const struct snd_soc_dapm_widget *widget)
  {
  	struct snd_soc_dapm_widget *w;
  	int ret;
  
  	if ((w = dapm_cnew_widget(widget)) == NULL)
  		return NULL;
  
  	switch (w->id) {
  	case snd_soc_dapm_regulator_supply:
  		w->regulator = devm_regulator_get(dapm->dev, w->name);
  		if (IS_ERR(w->regulator)) {
  			ret = PTR_ERR(w->regulator);
  			dev_err(dapm->dev, "ASoC: Failed to request %s: %d\n",
  				w->name, ret);
  			return NULL;
  		}
  
  		if (w->on_val & SND_SOC_DAPM_REGULATOR_BYPASS) {
  			ret = regulator_allow_bypass(w->regulator, true);
  			if (ret != 0)
  				dev_warn(w->dapm->dev,
  					 "ASoC: Failed to bypass %s: %d\n",
  					 w->name, ret);
  		}
  		break;
  	case snd_soc_dapm_clock_supply:
  #ifdef CONFIG_CLKDEV_LOOKUP
  		w->clk = devm_clk_get(dapm->dev, w->name);
  		if (IS_ERR(w->clk)) {
  			ret = PTR_ERR(w->clk);
  			dev_err(dapm->dev, "ASoC: Failed to request %s: %d\n",
  				w->name, ret);
  			return NULL;
  		}
  #else
  		return NULL;
  #endif
  		break;
  	default:
  		break;
  	}
  
  	if (dapm->codec && dapm->codec->name_prefix)
  		w->name = kasprintf(GFP_KERNEL, "%s %s",
  			dapm->codec->name_prefix, widget->name);
  	else
  		w->name = kasprintf(GFP_KERNEL, "%s", widget->name);
  
  	if (w->name == NULL) {
  		kfree(w);
  		return NULL;
  	}
  
  	switch (w->id) {
  	case snd_soc_dapm_switch:
  	case snd_soc_dapm_mixer:
  	case snd_soc_dapm_mixer_named_ctl:
  		w->power_check = dapm_generic_check_power;
  		break;
  	case snd_soc_dapm_mux:
  		w->power_check = dapm_generic_check_power;
  		break;
  	case snd_soc_dapm_dai_out:
  		w->power_check = dapm_adc_check_power;
  		break;
  	case snd_soc_dapm_dai_in:
  		w->power_check = dapm_dac_check_power;
  		break;
  	case snd_soc_dapm_adc:
  	case snd_soc_dapm_aif_out:
  	case snd_soc_dapm_dac:
  	case snd_soc_dapm_aif_in:
  	case snd_soc_dapm_pga:
  	case snd_soc_dapm_out_drv:
  	case snd_soc_dapm_input:
  	case snd_soc_dapm_output:
  	case snd_soc_dapm_micbias:
  	case snd_soc_dapm_spk:
  	case snd_soc_dapm_hp:
  	case snd_soc_dapm_mic:
  	case snd_soc_dapm_line:
  	case snd_soc_dapm_dai_link:
  		w->power_check = dapm_generic_check_power;
  		break;
  	case snd_soc_dapm_supply:
  	case snd_soc_dapm_regulator_supply:
  	case snd_soc_dapm_clock_supply:
  	case snd_soc_dapm_kcontrol:
  		w->power_check = dapm_supply_check_power;
  		break;
  	default:
  		w->power_check = dapm_always_on_check_power;
  		break;
  	}
  
  	w->dapm = dapm;
  	w->codec = dapm->codec;
  	w->platform = dapm->platform;
  	INIT_LIST_HEAD(&w->sources);
  	INIT_LIST_HEAD(&w->sinks);
  	INIT_LIST_HEAD(&w->list);
  	INIT_LIST_HEAD(&w->dirty);
  	list_add(&w->list, &dapm->card->widgets);
  
  	/* machine layer set ups unconnected pins and insertions */
  	w->connected = 1;
  	return w;
  }
  
  /**
   * snd_soc_dapm_new_controls - create new dapm controls
   * @dapm: DAPM context
   * @widget: widget array
   * @num: number of widgets
   *
   * Creates new DAPM controls based upon the templates.
   *
   * Returns 0 for success else error.
   */
  int snd_soc_dapm_new_controls(struct snd_soc_dapm_context *dapm,
  	const struct snd_soc_dapm_widget *widget,
  	int num)
  {
  	struct snd_soc_dapm_widget *w;
  	int i;
  	int ret = 0;
  
  	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
  	for (i = 0; i < num; i++) {
  		w = snd_soc_dapm_new_control(dapm, widget);
  		if (!w) {
  			dev_err(dapm->dev,
  				"ASoC: Failed to create DAPM control %s\n",
  				widget->name);
  			ret = -ENOMEM;
  			break;
  		}
  		widget++;
  	}
  	mutex_unlock(&dapm->card->dapm_mutex);
  	return ret;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_new_controls);
  
  static int snd_soc_dai_link_event(struct snd_soc_dapm_widget *w,
  				  struct snd_kcontrol *kcontrol, int event)
  {
  	struct snd_soc_dapm_path *source_p, *sink_p;
  	struct snd_soc_dai *source, *sink;
  	const struct snd_soc_pcm_stream *config = w->params;
  	struct snd_pcm_substream substream;
  	struct snd_pcm_hw_params *params = NULL;
  	u64 fmt;
  	int ret;
  
  	if (WARN_ON(!config) ||
  	    WARN_ON(list_empty(&w->sources) || list_empty(&w->sinks)))
  		return -EINVAL;
  
  	/* We only support a single source and sink, pick the first */
  	source_p = list_first_entry(&w->sources, struct snd_soc_dapm_path,
  				    list_sink);
  	sink_p = list_first_entry(&w->sinks, struct snd_soc_dapm_path,
  				  list_source);
  
  	if (WARN_ON(!source_p || !sink_p) ||
  	    WARN_ON(!sink_p->source || !source_p->sink) ||
  	    WARN_ON(!source_p->source || !sink_p->sink))
  		return -EINVAL;
  
  	source = source_p->source->priv;
  	sink = sink_p->sink->priv;
  
  	/* Be a little careful as we don't want to overflow the mask array */
  	if (config->formats) {
  		fmt = ffs(config->formats) - 1;
  	} else {
  		dev_warn(w->dapm->dev, "ASoC: Invalid format %llx specified\n",
  			 config->formats);
  		fmt = 0;
  	}
  
  	/* Currently very limited parameter selection */
  	params = kzalloc(sizeof(*params), GFP_KERNEL);
  	if (!params) {
  		ret = -ENOMEM;
  		goto out;
  	}
  	snd_mask_set(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), fmt);
  
  	hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE)->min =
  		config->rate_min;
  	hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE)->max =
  		config->rate_max;
  
  	hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS)->min
  		= config->channels_min;
  	hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS)->max
  		= config->channels_max;
  
  	memset(&substream, 0, sizeof(substream));
  
  	switch (event) {
  	case SND_SOC_DAPM_PRE_PMU:
  		if (source->driver->ops && source->driver->ops->hw_params) {
  			substream.stream = SNDRV_PCM_STREAM_CAPTURE;
  			ret = source->driver->ops->hw_params(&substream,
  							     params, source);
  			if (ret != 0) {
  				dev_err(source->dev,
  					"ASoC: hw_params() failed: %d\n", ret);
  				goto out;
  			}
  		}
  
  		if (sink->driver->ops && sink->driver->ops->hw_params) {
  			substream.stream = SNDRV_PCM_STREAM_PLAYBACK;
  			ret = sink->driver->ops->hw_params(&substream, params,
  							   sink);
  			if (ret != 0) {
  				dev_err(sink->dev,
  					"ASoC: hw_params() failed: %d\n", ret);
  				goto out;
  			}
  		}
  		break;
  
  	case SND_SOC_DAPM_POST_PMU:
  		ret = snd_soc_dai_digital_mute(sink, 0,
  					       SNDRV_PCM_STREAM_PLAYBACK);
  		if (ret != 0 && ret != -ENOTSUPP)
  			dev_warn(sink->dev, "ASoC: Failed to unmute: %d\n", ret);
  		ret = 0;
  		break;
  
  	case SND_SOC_DAPM_PRE_PMD:
  		ret = snd_soc_dai_digital_mute(sink, 1,
  					       SNDRV_PCM_STREAM_PLAYBACK);
  		if (ret != 0 && ret != -ENOTSUPP)
  			dev_warn(sink->dev, "ASoC: Failed to mute: %d\n", ret);
  		ret = 0;
  		break;
  
  	default:
  		WARN(1, "Unknown event %d\n", event);
  		return -EINVAL;
  	}
  
  out:
  	kfree(params);
  	return ret;
  }
  
  int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
  			 const struct snd_soc_pcm_stream *params,
  			 struct snd_soc_dapm_widget *source,
  			 struct snd_soc_dapm_widget *sink)
  {
  	struct snd_soc_dapm_widget template;
  	struct snd_soc_dapm_widget *w;
  	size_t len;
  	char *link_name;
  	int ret;
  
  	len = strlen(source->name) + strlen(sink->name) + 2;
  	link_name = devm_kzalloc(card->dev, len, GFP_KERNEL);
  	if (!link_name)
  		return -ENOMEM;
  	snprintf(link_name, len, "%s-%s", source->name, sink->name);
  
  	memset(&template, 0, sizeof(template));
  	template.reg = SND_SOC_NOPM;
  	template.id = snd_soc_dapm_dai_link;
  	template.name = link_name;
  	template.event = snd_soc_dai_link_event;
  	template.event_flags = SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMU |
  		SND_SOC_DAPM_PRE_PMD;
  
  	dev_dbg(card->dev, "ASoC: adding %s widget\n", link_name);
  
  	w = snd_soc_dapm_new_control(&card->dapm, &template);
  	if (!w) {
  		dev_err(card->dev, "ASoC: Failed to create %s widget\n",
  			link_name);
  		return -ENOMEM;
  	}
  
  	w->params = params;
  
  	ret = snd_soc_dapm_add_path(&card->dapm, source, w, NULL, NULL);
  	if (ret)
  		return ret;
  	return snd_soc_dapm_add_path(&card->dapm, w, sink, NULL, NULL);
  }
  
  int snd_soc_dapm_new_dai_widgets(struct snd_soc_dapm_context *dapm,
  				 struct snd_soc_dai *dai)
  {
  	struct snd_soc_dapm_widget template;
  	struct snd_soc_dapm_widget *w;
  
  	WARN_ON(dapm->dev != dai->dev);
  
  	memset(&template, 0, sizeof(template));
  	template.reg = SND_SOC_NOPM;
  
  	if (dai->driver->playback.stream_name) {
  		template.id = snd_soc_dapm_dai_in;
  		template.name = dai->driver->playback.stream_name;
  		template.sname = dai->driver->playback.stream_name;
  
  		dev_dbg(dai->dev, "ASoC: adding %s widget\n",
  			template.name);
  
  		w = snd_soc_dapm_new_control(dapm, &template);
  		if (!w) {
  			dev_err(dapm->dev, "ASoC: Failed to create %s widget\n",
  				dai->driver->playback.stream_name);
  			return -ENOMEM;
  		}
  
  		w->priv = dai;
  		dai->playback_widget = w;
  	}
  
  	if (dai->driver->capture.stream_name) {
  		template.id = snd_soc_dapm_dai_out;
  		template.name = dai->driver->capture.stream_name;
  		template.sname = dai->driver->capture.stream_name;
  
  		dev_dbg(dai->dev, "ASoC: adding %s widget\n",
  			template.name);
  
  		w = snd_soc_dapm_new_control(dapm, &template);
  		if (!w) {
  			dev_err(dapm->dev, "ASoC: Failed to create %s widget\n",
  				dai->driver->capture.stream_name);
  			return -ENOMEM;
  		}
  
  		w->priv = dai;
  		dai->capture_widget = w;
  	}
  
  	return 0;
  }
  
  int snd_soc_dapm_link_dai_widgets(struct snd_soc_card *card)
  {
  	struct snd_soc_dapm_widget *dai_w, *w;
  	struct snd_soc_dapm_widget *src, *sink;
  	struct snd_soc_dai *dai;
  
  	/* For each DAI widget... */
  	list_for_each_entry(dai_w, &card->widgets, list) {
  		switch (dai_w->id) {
  		case snd_soc_dapm_dai_in:
  		case snd_soc_dapm_dai_out:
  			break;
  		default:
  			continue;
  		}
  
  		dai = dai_w->priv;
  
  		/* ...find all widgets with the same stream and link them */
  		list_for_each_entry(w, &card->widgets, list) {
  			if (w->dapm != dai_w->dapm)
  				continue;
  
  			switch (w->id) {
  			case snd_soc_dapm_dai_in:
  			case snd_soc_dapm_dai_out:
  				continue;
  			default:
  				break;
  			}
  
  			if (!w->sname || !strstr(w->sname, dai_w->name))
  				continue;
  
  			if (dai_w->id == snd_soc_dapm_dai_in) {
  				src = dai_w;
  				sink = w;
  			} else {
  				src = w;
  				sink = dai_w;
  			}
  			dev_dbg(dai->dev, "%s -> %s\n", src->name, sink->name);
  			snd_soc_dapm_add_path(w->dapm, src, sink, NULL, NULL);
  		}
  	}
  
  	return 0;
  }
  
  void snd_soc_dapm_connect_dai_link_widgets(struct snd_soc_card *card)
  {
  	struct snd_soc_pcm_runtime *rtd = card->rtd;
  	struct snd_soc_dapm_widget *sink, *source;
  	struct snd_soc_dai *cpu_dai, *codec_dai;
  	int i;
  
  	/* for each BE DAI link... */
  	for (i = 0; i < card->num_rtd; i++) {
  		rtd = &card->rtd[i];
  		cpu_dai = rtd->cpu_dai;
  		codec_dai = rtd->codec_dai;
  
  		/*
  		 * dynamic FE links have no fixed DAI mapping.
  		 * CODEC<->CODEC links have no direct connection.
  		 */
  		if (rtd->dai_link->dynamic || rtd->dai_link->params)
  			continue;
  
  		/* there is no point in connecting BE DAI links with dummies */
  		if (snd_soc_dai_is_dummy(codec_dai) ||
  			snd_soc_dai_is_dummy(cpu_dai))
  			continue;
  
  		/* connect BE DAI playback if widgets are valid */
  		if (codec_dai->playback_widget && cpu_dai->playback_widget) {
  			source = cpu_dai->playback_widget;
  			sink = codec_dai->playback_widget;
  			dev_dbg(rtd->dev, "connected DAI link %s:%s -> %s:%s\n",
  				cpu_dai->codec->name, source->name,
  				codec_dai->platform->name, sink->name);
  
  			snd_soc_dapm_add_path(&card->dapm, source, sink,
  				NULL, NULL);
  		}
  
  		/* connect BE DAI capture if widgets are valid */
  		if (codec_dai->capture_widget && cpu_dai->capture_widget) {
  			source = codec_dai->capture_widget;
  			sink = cpu_dai->capture_widget;
  			dev_dbg(rtd->dev, "connected DAI link %s:%s -> %s:%s\n",
  				codec_dai->codec->name, source->name,
  				cpu_dai->platform->name, sink->name);
  
  			snd_soc_dapm_add_path(&card->dapm, source, sink,
  				NULL, NULL);
  		}
  	}
  }
  
  static void soc_dapm_dai_stream_event(struct snd_soc_dai *dai, int stream,
  	int event)
  {
  	struct snd_soc_dapm_widget *w;
  
  	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
  		w = dai->playback_widget;
  	else
  		w = dai->capture_widget;
  
  	if (w) {
  		dapm_mark_dirty(w, "stream event");
  
  		switch (event) {
  		case SND_SOC_DAPM_STREAM_START:
  			w->active = 1;
  			break;
  		case SND_SOC_DAPM_STREAM_STOP:
  			w->active = 0;
  			break;
  		case SND_SOC_DAPM_STREAM_SUSPEND:
  		case SND_SOC_DAPM_STREAM_RESUME:
  		case SND_SOC_DAPM_STREAM_PAUSE_PUSH:
  		case SND_SOC_DAPM_STREAM_PAUSE_RELEASE:
  			break;
  		}
  	}
  }
  
  static void soc_dapm_stream_event(struct snd_soc_pcm_runtime *rtd, int stream,
  	int event)
  {
  	soc_dapm_dai_stream_event(rtd->cpu_dai, stream, event);
  	soc_dapm_dai_stream_event(rtd->codec_dai, stream, event);
  
  	dapm_power_widgets(rtd->card, event);
  }
  
  /**
   * snd_soc_dapm_stream_event - send a stream event to the dapm core
   * @rtd: PCM runtime data
   * @stream: stream name
   * @event: stream event
   *
   * Sends a stream event to the dapm core. The core then makes any
   * necessary widget power changes.
   *
   * Returns 0 for success else error.
   */
  void snd_soc_dapm_stream_event(struct snd_soc_pcm_runtime *rtd, int stream,
  			      int event)
  {
  	struct snd_soc_card *card = rtd->card;
  
  	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
  	soc_dapm_stream_event(rtd, stream, event);
  	mutex_unlock(&card->dapm_mutex);
  }
  
  /**
   * snd_soc_dapm_enable_pin_unlocked - enable pin.
   * @dapm: DAPM context
   * @pin: pin name
   *
   * Enables input/output pin and its parents or children widgets iff there is
   * a valid audio route and active audio stream.
   *
   * Requires external locking.
   *
   * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
   * do any widget power switching.
   */
  int snd_soc_dapm_enable_pin_unlocked(struct snd_soc_dapm_context *dapm,
  				   const char *pin)
  {
  	return snd_soc_dapm_set_pin(dapm, pin, 1);
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_enable_pin_unlocked);
  
  /**
   * snd_soc_dapm_enable_pin - enable pin.
   * @dapm: DAPM context
   * @pin: pin name
   *
   * Enables input/output pin and its parents or children widgets iff there is
   * a valid audio route and active audio stream.
   *
   * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
   * do any widget power switching.
   */
  int snd_soc_dapm_enable_pin(struct snd_soc_dapm_context *dapm, const char *pin)
  {
  	int ret;
  
  	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
  
  	ret = snd_soc_dapm_set_pin(dapm, pin, 1);
  
  	mutex_unlock(&dapm->card->dapm_mutex);
  
  	return ret;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_enable_pin);
  
  /**
   * snd_soc_dapm_force_enable_pin_unlocked - force a pin to be enabled
   * @dapm: DAPM context
   * @pin: pin name
   *
   * Enables input/output pin regardless of any other state.  This is
   * intended for use with microphone bias supplies used in microphone
   * jack detection.
   *
   * Requires external locking.
   *
   * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
   * do any widget power switching.
   */
  int snd_soc_dapm_force_enable_pin_unlocked(struct snd_soc_dapm_context *dapm,
  					 const char *pin)
  {
  	struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);
  
  	if (!w) {
  		dev_err(dapm->dev, "ASoC: unknown pin %s\n", pin);
  		return -EINVAL;
  	}
  
  	dev_dbg(w->dapm->dev, "ASoC: force enable pin %s\n", pin);
  	w->connected = 1;
  	w->force = 1;
  	dapm_mark_dirty(w, "force enable");
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_force_enable_pin_unlocked);
  
  /**
   * snd_soc_dapm_force_enable_pin - force a pin to be enabled
   * @dapm: DAPM context
   * @pin: pin name
   *
   * Enables input/output pin regardless of any other state.  This is
   * intended for use with microphone bias supplies used in microphone
   * jack detection.
   *
   * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
   * do any widget power switching.
   */
  int snd_soc_dapm_force_enable_pin(struct snd_soc_dapm_context *dapm,
  				  const char *pin)
  {
  	int ret;
  
  	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
  
  	ret = snd_soc_dapm_force_enable_pin_unlocked(dapm, pin);
  
  	mutex_unlock(&dapm->card->dapm_mutex);
  
  	return ret;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_force_enable_pin);
  
  /**
   * snd_soc_dapm_disable_pin_unlocked - disable pin.
   * @dapm: DAPM context
   * @pin: pin name
   *
   * Disables input/output pin and its parents or children widgets.
   *
   * Requires external locking.
   *
   * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
   * do any widget power switching.
   */
  int snd_soc_dapm_disable_pin_unlocked(struct snd_soc_dapm_context *dapm,
  				    const char *pin)
  {
  	return snd_soc_dapm_set_pin(dapm, pin, 0);
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_disable_pin_unlocked);
  
  /**
   * snd_soc_dapm_disable_pin - disable pin.
   * @dapm: DAPM context
   * @pin: pin name
   *
   * Disables input/output pin and its parents or children widgets.
   *
   * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
   * do any widget power switching.
   */
  int snd_soc_dapm_disable_pin(struct snd_soc_dapm_context *dapm,
  			     const char *pin)
  {
  	int ret;
  
  	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
  
  	ret = snd_soc_dapm_set_pin(dapm, pin, 0);
  
  	mutex_unlock(&dapm->card->dapm_mutex);
  
  	return ret;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_disable_pin);
  
  /**
   * snd_soc_dapm_nc_pin_unlocked - permanently disable pin.
   * @dapm: DAPM context
   * @pin: pin name
   *
   * Marks the specified pin as being not connected, disabling it along
   * any parent or child widgets.  At present this is identical to
   * snd_soc_dapm_disable_pin() but in future it will be extended to do
   * additional things such as disabling controls which only affect
   * paths through the pin.
   *
   * Requires external locking.
   *
   * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
   * do any widget power switching.
   */
  int snd_soc_dapm_nc_pin_unlocked(struct snd_soc_dapm_context *dapm,
  			       const char *pin)
  {
  	return snd_soc_dapm_set_pin(dapm, pin, 0);
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_nc_pin_unlocked);
  
  /**
   * snd_soc_dapm_nc_pin - permanently disable pin.
   * @dapm: DAPM context
   * @pin: pin name
   *
   * Marks the specified pin as being not connected, disabling it along
   * any parent or child widgets.  At present this is identical to
   * snd_soc_dapm_disable_pin() but in future it will be extended to do
   * additional things such as disabling controls which only affect
   * paths through the pin.
   *
   * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
   * do any widget power switching.
   */
  int snd_soc_dapm_nc_pin(struct snd_soc_dapm_context *dapm, const char *pin)
  {
  	int ret;
  
  	mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
  
  	ret = snd_soc_dapm_set_pin(dapm, pin, 0);
  
  	mutex_unlock(&dapm->card->dapm_mutex);
  
  	return ret;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_nc_pin);
  
  /**
   * snd_soc_dapm_get_pin_status - get audio pin status
   * @dapm: DAPM context
   * @pin: audio signal pin endpoint (or start point)
   *
   * Get audio pin status - connected or disconnected.
   *
   * Returns 1 for connected otherwise 0.
   */
  int snd_soc_dapm_get_pin_status(struct snd_soc_dapm_context *dapm,
  				const char *pin)
  {
  	struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);
  
  	if (w)
  		return w->connected;
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_get_pin_status);
  
  /**
   * snd_soc_dapm_ignore_suspend - ignore suspend status for DAPM endpoint
   * @dapm: DAPM context
   * @pin: audio signal pin endpoint (or start point)
   *
   * Mark the given endpoint or pin as ignoring suspend.  When the
   * system is disabled a path between two endpoints flagged as ignoring
   * suspend will not be disabled.  The path must already be enabled via
   * normal means at suspend time, it will not be turned on if it was not
   * already enabled.
   */
  int snd_soc_dapm_ignore_suspend(struct snd_soc_dapm_context *dapm,
  				const char *pin)
  {
  	struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, false);
  
  	if (!w) {
  		dev_err(dapm->dev, "ASoC: unknown pin %s\n", pin);
  		return -EINVAL;
  	}
  
  	w->ignore_suspend = 1;
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_ignore_suspend);
  
  static bool snd_soc_dapm_widget_in_card_paths(struct snd_soc_card *card,
  					      struct snd_soc_dapm_widget *w)
  {
  	struct snd_soc_dapm_path *p;
  
  	list_for_each_entry(p, &card->paths, list) {
  		if ((p->source == w) || (p->sink == w)) {
  			dev_dbg(card->dev,
  			    "... Path %s(id:%d dapm:%p) - %s(id:%d dapm:%p)\n",
  			    p->source->name, p->source->id, p->source->dapm,
  			    p->sink->name, p->sink->id, p->sink->dapm);
  
  			/* Connected to something other than the codec */
  			if (p->source->dapm != p->sink->dapm)
  				return true;
  			/*
  			 * Loopback connection from codec external pin to
  			 * codec external pin
  			 */
  			if (p->sink->id == snd_soc_dapm_input) {
  				switch (p->source->id) {
  				case snd_soc_dapm_output:
  				case snd_soc_dapm_micbias:
  					return true;
  				default:
  					break;
  				}
  			}
  		}
  	}
  
  	return false;
  }
  
  /**
   * snd_soc_dapm_auto_nc_codec_pins - call snd_soc_dapm_nc_pin for unused pins
   * @codec: The codec whose pins should be processed
   *
   * Automatically call snd_soc_dapm_nc_pin() for any external pins in the codec
   * which are unused. Pins are used if they are connected externally to the
   * codec, whether that be to some other device, or a loop-back connection to
   * the codec itself.
   */
  void snd_soc_dapm_auto_nc_codec_pins(struct snd_soc_codec *codec)
  {
  	struct snd_soc_card *card = codec->card;
  	struct snd_soc_dapm_context *dapm = &codec->dapm;
  	struct snd_soc_dapm_widget *w;
  
  	dev_dbg(codec->dev, "ASoC: Auto NC: DAPMs: card:%p codec:%p\n",
  		&card->dapm, &codec->dapm);
  
  	list_for_each_entry(w, &card->widgets, list) {
  		if (w->dapm != dapm)
  			continue;
  		switch (w->id) {
  		case snd_soc_dapm_input:
  		case snd_soc_dapm_output:
  		case snd_soc_dapm_micbias:
  			dev_dbg(codec->dev, "ASoC: Auto NC: Checking widget %s\n",
  				w->name);
  			if (!snd_soc_dapm_widget_in_card_paths(card, w)) {
  				dev_dbg(codec->dev,
  					"... Not in map; disabling\n");
  				snd_soc_dapm_nc_pin(dapm, w->name);
  			}
  			break;
  		default:
  			break;
  		}
  	}
  }
  
  /**
   * snd_soc_dapm_free - free dapm resources
   * @dapm: DAPM context
   *
   * Free all dapm widgets and resources.
   */
  void snd_soc_dapm_free(struct snd_soc_dapm_context *dapm)
  {
  	snd_soc_dapm_sys_remove(dapm->dev);
  	dapm_debugfs_cleanup(dapm);
  	dapm_free_widgets(dapm);
  	list_del(&dapm->list);
  }
  EXPORT_SYMBOL_GPL(snd_soc_dapm_free);
  
  static void soc_dapm_shutdown_dapm(struct snd_soc_dapm_context *dapm)
  {
  	struct snd_soc_card *card = dapm->card;
  	struct snd_soc_dapm_widget *w;
  	LIST_HEAD(down_list);
  	int powerdown = 0;
  
  	mutex_lock(&card->dapm_mutex);
  
  	list_for_each_entry(w, &dapm->card->widgets, list) {
  		if (w->dapm != dapm)
  			continue;
  		if (w->power) {
  			dapm_seq_insert(w, &down_list, false);
  			w->power = 0;
  			powerdown = 1;
  		}
  	}
  
  	/* If there were no widgets to power down we're already in
  	 * standby.
  	 */
  	if (powerdown) {
  		if (dapm->bias_level == SND_SOC_BIAS_ON)
  			snd_soc_dapm_set_bias_level(dapm,
  						    SND_SOC_BIAS_PREPARE);
  		dapm_seq_run(card, &down_list, 0, false);
  		if (dapm->bias_level == SND_SOC_BIAS_PREPARE)
  			snd_soc_dapm_set_bias_level(dapm,
  						    SND_SOC_BIAS_STANDBY);
  	}
  
  	mutex_unlock(&card->dapm_mutex);
  }
  
  /*
   * snd_soc_dapm_shutdown - callback for system shutdown
   */
  void snd_soc_dapm_shutdown(struct snd_soc_card *card)
  {
  	struct snd_soc_dapm_context *dapm;
  
  	list_for_each_entry(dapm, &card->dapm_list, list) {
  		if (dapm != &card->dapm) {
  			soc_dapm_shutdown_dapm(dapm);
  			if (dapm->bias_level == SND_SOC_BIAS_STANDBY)
  				snd_soc_dapm_set_bias_level(dapm,
  							    SND_SOC_BIAS_OFF);
  		}
  	}
  
  	soc_dapm_shutdown_dapm(&card->dapm);
  	if (card->dapm.bias_level == SND_SOC_BIAS_STANDBY)
  		snd_soc_dapm_set_bias_level(&card->dapm,
  					    SND_SOC_BIAS_OFF);
  }
  
  /* Module information */
  MODULE_AUTHOR("Liam Girdwood, lrg@slimlogic.co.uk");
  MODULE_DESCRIPTION("Dynamic Audio Power Management core for ALSA SoC");
  MODULE_LICENSE("GPL");
  