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 // SPDX-License-Identifier: GPL-2.0+
 //
 // soc-dapm.c  --  ALSA SoC Dynamic Audio Power Management
 //
 // Copyright 2005 Wolfson Microelectronics PLC.
 // Author: Liam Girdwood <lrg@slimlogic.co.uk>
 //
 //  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/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/pinctrl/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++;
 
 #define SND_SOC_DAPM_DIR_REVERSE(x) ((x == SND_SOC_DAPM_DIR_IN) ? \
     SND_SOC_DAPM_DIR_OUT : SND_SOC_DAPM_DIR_IN)
 
 #define snd_soc_dapm_for_each_direction(dir) \
     for ((dir) = SND_SOC_DAPM_DIR_IN; (dir) <= SND_SOC_DAPM_DIR_OUT; \
         (dir)++)
 
 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_widget *
 snd_soc_dapm_new_control(struct snd_soc_dapm_context *dapm,
              const struct snd_soc_dapm_widget *widget);
 
 struct snd_soc_dapm_widget *
 snd_soc_dapm_new_control_unlocked(struct snd_soc_dapm_context *dapm,
              const struct snd_soc_dapm_widget *widget);
 
 static unsigned int soc_dapm_read(struct snd_soc_dapm_context *dapm, int reg);
 
 /* dapm power sequences - make this per codec in the future */
 static int dapm_up_seq[] = {
     [snd_soc_dapm_pre] = 1,
     [snd_soc_dapm_regulator_supply] = 2,
     [snd_soc_dapm_pinctrl] = 2,
     [snd_soc_dapm_clock_supply] = 2,
     [snd_soc_dapm_supply] = 3,
     [snd_soc_dapm_micbias] = 4,
     [snd_soc_dapm_vmid] = 4,
     [snd_soc_dapm_dai_link] = 3,
     [snd_soc_dapm_dai_in] = 5,
     [snd_soc_dapm_dai_out] = 5,
     [snd_soc_dapm_aif_in] = 5,
     [snd_soc_dapm_aif_out] = 5,
     [snd_soc_dapm_mic] = 6,
     [snd_soc_dapm_siggen] = 6,
     [snd_soc_dapm_input] = 6,
     [snd_soc_dapm_output] = 6,
     [snd_soc_dapm_mux] = 7,
     [snd_soc_dapm_demux] = 7,
     [snd_soc_dapm_dac] = 8,
     [snd_soc_dapm_switch] = 9,
     [snd_soc_dapm_mixer] = 9,
     [snd_soc_dapm_mixer_named_ctl] = 9,
     [snd_soc_dapm_pga] = 10,
     [snd_soc_dapm_buffer] = 10,
     [snd_soc_dapm_scheduler] = 10,
     [snd_soc_dapm_effect] = 10,
     [snd_soc_dapm_src] = 10,
     [snd_soc_dapm_asrc] = 10,
     [snd_soc_dapm_encoder] = 10,
     [snd_soc_dapm_decoder] = 10,
     [snd_soc_dapm_adc] = 11,
     [snd_soc_dapm_out_drv] = 12,
     [snd_soc_dapm_hp] = 12,
     [snd_soc_dapm_spk] = 12,
     [snd_soc_dapm_line] = 12,
     [snd_soc_dapm_sink] = 12,
     [snd_soc_dapm_kcontrol] = 13,
     [snd_soc_dapm_post] = 14,
 };
 
 static int dapm_down_seq[] = {
     [snd_soc_dapm_pre] = 1,
     [snd_soc_dapm_kcontrol] = 2,
     [snd_soc_dapm_adc] = 3,
     [snd_soc_dapm_hp] = 4,
     [snd_soc_dapm_spk] = 4,
     [snd_soc_dapm_line] = 4,
     [snd_soc_dapm_out_drv] = 4,
     [snd_soc_dapm_sink] = 4,
     [snd_soc_dapm_pga] = 5,
     [snd_soc_dapm_buffer] = 5,
     [snd_soc_dapm_scheduler] = 5,
     [snd_soc_dapm_effect] = 5,
     [snd_soc_dapm_src] = 5,
     [snd_soc_dapm_asrc] = 5,
     [snd_soc_dapm_encoder] = 5,
     [snd_soc_dapm_decoder] = 5,
     [snd_soc_dapm_switch] = 6,
     [snd_soc_dapm_mixer_named_ctl] = 6,
     [snd_soc_dapm_mixer] = 6,
     [snd_soc_dapm_dac] = 7,
     [snd_soc_dapm_mic] = 8,
     [snd_soc_dapm_siggen] = 8,
     [snd_soc_dapm_input] = 8,
     [snd_soc_dapm_output] = 8,
     [snd_soc_dapm_micbias] = 9,
     [snd_soc_dapm_vmid] = 9,
     [snd_soc_dapm_mux] = 10,
     [snd_soc_dapm_demux] = 10,
     [snd_soc_dapm_aif_in] = 11,
     [snd_soc_dapm_aif_out] = 11,
     [snd_soc_dapm_dai_in] = 11,
     [snd_soc_dapm_dai_out] = 11,
     [snd_soc_dapm_dai_link] = 12,
     [snd_soc_dapm_supply] = 13,
     [snd_soc_dapm_clock_supply] = 14,
     [snd_soc_dapm_pinctrl] = 14,
     [snd_soc_dapm_regulator_supply] = 14,
     [snd_soc_dapm_post] = 15,
 };
 
 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));
 }
 
 __printf(3, 4)
 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);
     }
 }
 
 /*
  * Common implementation for dapm_widget_invalidate_input_paths() and
  * dapm_widget_invalidate_output_paths(). The function is inlined since the
  * combined size of the two specialized functions is only marginally larger then
  * the size of the generic function and at the same time the fast path of the
  * specialized functions is significantly smaller than the generic function.
  */
 static __always_inline void dapm_widget_invalidate_paths(
     struct snd_soc_dapm_widget *w, enum snd_soc_dapm_direction dir)
 {
     enum snd_soc_dapm_direction rdir = SND_SOC_DAPM_DIR_REVERSE(dir);
     struct snd_soc_dapm_widget *node;
     struct snd_soc_dapm_path *p;
     LIST_HEAD(list);
 
     dapm_assert_locked(w->dapm);
 
     if (w->endpoints[dir] == -1)
         return;
 
     list_add_tail(&w->work_list, &list);
     w->endpoints[dir] = -1;
 
     list_for_each_entry(w, &list, work_list) {
         snd_soc_dapm_widget_for_each_path(w, dir, p) {
             if (p->is_supply || p->weak || !p->connect)
                 continue;
             node = p->node[rdir];
             if (node->endpoints[dir] != -1) {
                 node->endpoints[dir] = -1;
                 list_add_tail(&node->work_list, &list);
             }
         }
     }
 }
 
 /*
  * dapm_widget_invalidate_input_paths() - Invalidate the cached number of
  *  input paths
  * @w: The widget for which to invalidate the cached number of input paths
  *
  * Resets the cached number of inputs for the specified widget and all widgets
  * that can be reached via outcoming paths from the widget.
  *
  * This function must be called if the number of output paths for a widget might
  * have changed. E.g. if the source state of a widget changes or a path is added
  * or activated with the widget as the sink.
  */
 static void dapm_widget_invalidate_input_paths(struct snd_soc_dapm_widget *w)
 {
     dapm_widget_invalidate_paths(w, SND_SOC_DAPM_DIR_IN);
 }
 
 /*
  * dapm_widget_invalidate_output_paths() - Invalidate the cached number of
  *  output paths
  * @w: The widget for which to invalidate the cached number of output paths
  *
  * Resets the cached number of outputs for the specified widget and all widgets
  * that can be reached via incoming paths from the widget.
  *
  * This function must be called if the number of output paths for a widget might
  * have changed. E.g. if the sink state of a widget changes or a path is added
  * or activated with the widget as the source.
  */
 static void dapm_widget_invalidate_output_paths(struct snd_soc_dapm_widget *w)
 {
     dapm_widget_invalidate_paths(w, SND_SOC_DAPM_DIR_OUT);
 }
 
 /*
  * dapm_path_invalidate() - Invalidates the cached number of inputs and outputs
  *  for the widgets connected to a path
  * @p: The path to invalidate
  *
  * Resets the cached number of inputs for the sink of the path and the cached
  * number of outputs for the source of the path.
  *
  * This function must be called when a path is added, removed or the connected
  * state changes.
  */
 static void dapm_path_invalidate(struct snd_soc_dapm_path *p)
 {
     /*
      * Weak paths or supply paths do not influence the number of input or
      * output paths of their neighbors.
      */
     if (p->weak || p->is_supply)
         return;
 
     /*
      * The number of connected endpoints is the sum of the number of
      * connected endpoints of all neighbors. If a node with 0 connected
      * endpoints is either connected or disconnected that sum won't change,
      * so there is no need to re-check the path.
      */
     if (p->source->endpoints[SND_SOC_DAPM_DIR_IN] != 0)
         dapm_widget_invalidate_input_paths(p->sink);
     if (p->sink->endpoints[SND_SOC_DAPM_DIR_OUT] != 0)
         dapm_widget_invalidate_output_paths(p->source);
 }
 
 void dapm_mark_endpoints_dirty(struct snd_soc_card *card)
 {
     struct snd_soc_dapm_widget *w;
 
     mutex_lock(&card->dapm_mutex);
 
     for_each_card_widgets(card, w) {
         if (w->is_ep) {
             dapm_mark_dirty(w, "Rechecking endpoints");
             if (w->is_ep & SND_SOC_DAPM_EP_SINK)
                 dapm_widget_invalidate_output_paths(w);
             if (w->is_ep & SND_SOC_DAPM_EP_SOURCE)
                 dapm_widget_invalidate_input_paths(w);
         }
     }
 
     mutex_unlock(&card->dapm_mutex);
 }
 EXPORT_SYMBOL_GPL(dapm_mark_endpoints_dirty);
 
 /* create a new dapm widget */
 static inline struct snd_soc_dapm_widget *dapm_cnew_widget(
     const struct snd_soc_dapm_widget *_widget)
 {
     struct snd_soc_dapm_widget *w;
 
     w = kmemdup(_widget, sizeof(*_widget), GFP_KERNEL);
     if (!w)
         return NULL;
 
     /*
      * w->name is duplicated in caller, but w->sname isn't.
      * Duplicate it here if defined
      */
     if (_widget->sname) {
         w->sname = kstrdup_const(_widget->sname, GFP_KERNEL);
         if (!w->sname) {
             kfree(w);
             return NULL;
         }
     }
     return w;
 }
 
 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, const char *ctrl_name)
 {
     struct dapm_kcontrol_data *data;
     struct soc_mixer_control *mc;
     struct soc_enum *e;
     const char *name;
     int ret;
 
     data = kzalloc(sizeof(*data), GFP_KERNEL);
     if (!data)
         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;
 
             if (snd_soc_volsw_is_stereo(mc))
                 dev_warn(widget->dapm->dev,
                      "ASoC: Unsupported stereo autodisable control '%s'\n",
                      ctrl_name);
 
             name = kasprintf(GFP_KERNEL, "%s %s", ctrl_name,
                      "Autodisable");
             if (!name) {
                 ret = -ENOMEM;
                 goto err_data;
             }
 
             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 = name;
 
             data->value = template.on_val;
 
             data->widget =
                 snd_soc_dapm_new_control_unlocked(widget->dapm,
                 &template);
             kfree(name);
             if (IS_ERR(data->widget)) {
                 ret = PTR_ERR(data->widget);
                 goto err_data;
             }
         }
         break;
     case snd_soc_dapm_demux:
     case snd_soc_dapm_mux:
         e = (struct soc_enum *)kcontrol->private_value;
 
         if (e->autodisable) {
             struct snd_soc_dapm_widget template;
 
             name = kasprintf(GFP_KERNEL, "%s %s", ctrl_name,
                      "Autodisable");
             if (!name) {
                 ret = -ENOMEM;
                 goto err_data;
             }
 
             memset(&template, 0, sizeof(template));
             template.reg = e->reg;
             template.mask = e->mask;
             template.shift = e->shift_l;
             template.off_val = snd_soc_enum_item_to_val(e, 0);
             template.on_val = template.off_val;
             template.id = snd_soc_dapm_kcontrol;
             template.name = name;
 
             data->value = template.on_val;
 
             data->widget = snd_soc_dapm_new_control_unlocked(
                         widget->dapm, &template);
             kfree(name);
             if (IS_ERR(data->widget)) {
                 ret = PTR_ERR(data->widget);
                 goto err_data;
             }
 
             snd_soc_dapm_add_path(widget->dapm, data->widget,
                           widget, NULL, NULL);
         } else if (e->reg != SND_SOC_NOPM) {
             data->value = soc_dapm_read(widget->dapm, e->reg) &
                       (e->mask << e->shift_l);
         }
         break;
     default:
         break;
     }
 
     kcontrol->private_data = data;
 
     return 0;
 
 err_data:
     kfree(data);
     return ret;
 }
 
 static void dapm_kcontrol_free(struct snd_kcontrol *kctl)
 {
     struct dapm_kcontrol_data *data = snd_kcontrol_chip(kctl);
 
     list_del(&data->paths);
     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,
                  struct_size(new_wlist, widgets, 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);
 }
 
 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)
 
 unsigned int dapm_kcontrol_get_value(const struct snd_kcontrol *kcontrol)
 {
     struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
 
     return data->value;
 }
 EXPORT_SYMBOL_GPL(dapm_kcontrol_get_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) {
         switch (dapm_kcontrol_get_wlist(kcontrol)->widgets[0]->id) {
         case snd_soc_dapm_switch:
         case snd_soc_dapm_mixer:
         case snd_soc_dapm_mixer_named_ctl:
             data->widget->on_val = value & data->widget->mask;
             break;
         case snd_soc_dapm_demux:
         case snd_soc_dapm_mux:
             data->widget->on_val = value >> data->widget->shift;
             break;
         default:
             data->widget->on_val = value;
             break;
         }
     }
 
     data->value = value;
 
     return true;
 }
 
 /**
  * snd_soc_dapm_kcontrol_widget() - Returns the widget associated to a
  *   kcontrol
  * @kcontrol: The kcontrol
  */
 struct snd_soc_dapm_widget *snd_soc_dapm_kcontrol_widget(
                 struct snd_kcontrol *kcontrol)
 {
     return dapm_kcontrol_get_wlist(kcontrol)->widgets[0];
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_kcontrol_widget);
 
 /**
  * snd_soc_dapm_kcontrol_dapm() - Returns the dapm context associated to a
  *  kcontrol
  * @kcontrol: The kcontrol
  *
  * Note: This function must only be used on kcontrols that are known to have
  * been registered for a CODEC. Otherwise the behaviour is undefined.
  */
 struct snd_soc_dapm_context *snd_soc_dapm_kcontrol_dapm(
     struct snd_kcontrol *kcontrol)
 {
     return dapm_kcontrol_get_wlist(kcontrol)->widgets[0]->dapm;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_kcontrol_dapm);
 
 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));
 
     for_each_card_widgets(card, w) {
         w->new_power = w->power;
         w->power_checked = false;
     }
 }
 
 static const char *soc_dapm_prefix(struct snd_soc_dapm_context *dapm)
 {
     if (!dapm->component)
         return NULL;
     return dapm->component->name_prefix;
 }
 
 static unsigned int soc_dapm_read(struct snd_soc_dapm_context *dapm, int reg)
 {
     if (!dapm->component)
         return -EIO;
     return  snd_soc_component_read(dapm->component, reg);
 }
 
 static int soc_dapm_update_bits(struct snd_soc_dapm_context *dapm,
     int reg, unsigned int mask, unsigned int value)
 {
     if (!dapm->component)
         return -EIO;
     return snd_soc_component_update_bits(dapm->component, reg,
                          mask, value);
 }
 
 static int soc_dapm_test_bits(struct snd_soc_dapm_context *dapm,
     int reg, unsigned int mask, unsigned int value)
 {
     if (!dapm->component)
         return -EIO;
     return snd_soc_component_test_bits(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);
 }
 
 static struct snd_soc_dapm_widget *
 dapm_wcache_lookup(struct snd_soc_dapm_wcache *wcache, const char *name)
 {
     struct snd_soc_dapm_widget *w = wcache->widget;
 
     if (w) {
         struct list_head *wlist = &w->dapm->card->widgets;
         const int depth = 2;
         int i = 0;
 
         list_for_each_entry_from(w, wlist, list) {
             if (!strcmp(name, w->name))
                 return w;
 
             if (++i == depth)
                 break;
         }
     }
 
     return NULL;
 }
 
 static inline void dapm_wcache_update(struct snd_soc_dapm_wcache *wcache,
                       struct snd_soc_dapm_widget *w)
 {
     wcache->widget = w;
 }
 
 /**
  * snd_soc_dapm_force_bias_level() - Sets the DAPM bias level
  * @dapm: The DAPM context for which to set the level
  * @level: The level to set
  *
  * Forces the DAPM bias level to a specific state. It will call the bias level
  * callback of DAPM context with the specified level. This will even happen if
  * the context is already at the same level. Furthermore it will not go through
  * the normal bias level sequencing, meaning any intermediate states between the
  * current and the target state will not be entered.
  *
  * Note that the change in bias level is only temporary and the next time
  * snd_soc_dapm_sync() is called the state will be set to the level as
  * determined by the DAPM core. The function is mainly intended to be used to
  * used during probe or resume from suspend to power up the device so
  * initialization can be done, before the DAPM core takes over.
  */
 int snd_soc_dapm_force_bias_level(struct snd_soc_dapm_context *dapm,
     enum snd_soc_bias_level level)
 {
     int ret = 0;
 
     if (dapm->component)
         ret = snd_soc_component_set_bias_level(dapm->component, level);
 
     if (ret == 0)
         dapm->bias_level = level;
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_force_bias_level);
 
 /**
  * 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);
 
     ret = snd_soc_card_set_bias_level(card, dapm, level);
     if (ret != 0)
         goto out;
 
     if (!card || dapm != &card->dapm)
         ret = snd_soc_dapm_force_bias_level(dapm, level);
 
     if (ret != 0)
         goto out;
 
     ret = snd_soc_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_path *path, const char *control_name,
     struct snd_soc_dapm_widget *w)
 {
     const struct snd_kcontrol_new *kcontrol = &w->kcontrol_news[0];
     struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
     unsigned int item;
     int i;
 
     if (e->reg != SND_SOC_NOPM) {
         unsigned int val;
         val = soc_dapm_read(dapm, e->reg);
         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;
     }
 
     i = match_string(e->texts, e->items, control_name);
     if (i < 0)
         return -ENODEV;
 
     path->name = e->texts[i];
     path->connect = (i == item);
     return 0;
 
 }
 
 /* set up initial codec paths */
 static void dapm_set_mixer_path_status(struct snd_soc_dapm_path *p, int i,
                        int nth_path)
 {
     struct soc_mixer_control *mc = (struct soc_mixer_control *)
         p->sink->kcontrol_news[i].private_value;
     unsigned int reg = mc->reg;
     unsigned int invert = mc->invert;
 
     if (reg != SND_SOC_NOPM) {
         unsigned int shift = mc->shift;
         unsigned int max = mc->max;
         unsigned int mask = (1 << fls(max)) - 1;
         unsigned int val = soc_dapm_read(p->sink->dapm, reg);
 
         /*
          * The nth_path argument allows this function to know
          * which path of a kcontrol it is setting the initial
          * status for. Ideally this would support any number
          * of paths and channels. But since kcontrols only come
          * in mono and stereo variants, we are limited to 2
          * channels.
          *
          * The following code assumes for stereo controls the
          * first path is the left channel, and all remaining
          * paths are the right channel.
          */
         if (snd_soc_volsw_is_stereo(mc) && nth_path > 0) {
             if (reg != mc->rreg)
                 val = soc_dapm_read(p->sink->dapm, mc->rreg);
             val = (val >> mc->rshift) & mask;
         } else {
             val = (val >> shift) & mask;
         }
         if (invert)
             val = max - val;
         p->connect = !!val;
     } else {
         /* since a virtual mixer has no backing registers to
          * decide which path to connect, it will try to match
          * with initial state.  This is to ensure
          * that the default mixer choice will be
          * correctly powered up during initialization.
          */
         p->connect = invert;
     }
 }
 
 /* connect mixer widget to its interconnecting audio paths */
 static int dapm_connect_mixer(struct snd_soc_dapm_context *dapm,
     struct snd_soc_dapm_path *path, const char *control_name)
 {
     int i, nth_path = 0;
 
     /* search for mixer kcontrol */
     for (i = 0; i < path->sink->num_kcontrols; i++) {
         if (!strcmp(control_name, path->sink->kcontrol_news[i].name)) {
             path->name = path->sink->kcontrol_news[i].name;
             dapm_set_mixer_path_status(path, i, nth_path++);
             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;
 
     for_each_card_widgets(dapm->card, w) {
         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_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 = NULL;
     const char *name;
     int ret = 0;
 
     prefix = soc_dapm_prefix(dapm);
     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:
             case snd_soc_dapm_pga:
             case snd_soc_dapm_effect:
             case snd_soc_dapm_out_drv:
                 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_demux:
             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);
         if (!kcontrol) {
             ret = -ENOMEM;
             goto exit_free;
         }
 
         kcontrol->private_free = dapm_kcontrol_free;
 
         ret = dapm_kcontrol_data_alloc(w, kcontrol, name);
         if (ret) {
             snd_ctl_free_one(kcontrol);
             goto exit_free;
         }
 
         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);
             goto exit_free;
         }
     }
 
     ret = dapm_kcontrol_add_widget(kcontrol, w);
     if (ret == 0)
         w->kcontrols[kci] = kcontrol;
 
 exit_free:
     kfree(long_name);
 
     return ret;
 }
 
 /* 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;
     struct dapm_kcontrol_data *data;
 
     /* add kcontrol */
     for (i = 0; i < w->num_kcontrols; i++) {
         /* match name */
         snd_soc_dapm_widget_for_each_source_path(w, path) {
             /* mixer/mux paths name must match control name */
             if (path->name != (char *)w->kcontrol_news[i].name)
                 continue;
 
             if (!w->kcontrols[i]) {
                 ret = dapm_create_or_share_kcontrol(w, i);
                 if (ret < 0)
                     return ret;
             }
 
             dapm_kcontrol_add_path(w->kcontrols[i], path);
 
             data = snd_kcontrol_chip(w->kcontrols[i]);
             if (data->widget)
                 snd_soc_dapm_add_path(data->widget->dapm,
                               data->widget,
                               path->source,
                               NULL, NULL);
         }
     }
 
     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;
     enum snd_soc_dapm_direction dir;
     struct snd_soc_dapm_path *path;
     const char *type;
     int ret;
 
     switch (w->id) {
     case snd_soc_dapm_mux:
         dir = SND_SOC_DAPM_DIR_OUT;
         type = "mux";
         break;
     case snd_soc_dapm_demux:
         dir = SND_SOC_DAPM_DIR_IN;
         type = "demux";
         break;
     default:
         return -EINVAL;
     }
 
     if (w->num_kcontrols != 1) {
         dev_err(dapm->dev,
             "ASoC: %s %s has incorrect number of controls\n", type,
             w->name);
         return -EINVAL;
     }
 
     if (list_empty(&w->edges[dir])) {
         dev_err(dapm->dev, "ASoC: %s %s has no paths\n", type, w->name);
         return -EINVAL;
     }
 
     ret = dapm_create_or_share_kcontrol(w, 0);
     if (ret < 0)
         return ret;
 
     snd_soc_dapm_widget_for_each_path(w, dir, path) {
         if (path->name)
             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)
 {
     int i;
 
     for (i = 0; i < w->num_kcontrols; i++) {
         int ret = dapm_create_or_share_kcontrol(w, i);
         if (ret < 0)
             return ret;
     }
 
     return 0;
 }
 
 /* create new dapm dai link control */
 static int dapm_new_dai_link(struct snd_soc_dapm_widget *w)
 {
     int i;
     struct snd_soc_pcm_runtime *rtd = w->priv;
 
     /* create control for links with > 1 config */
     if (rtd->dai_link->num_params <= 1)
         return 0;
 
     /* add kcontrol */
     for (i = 0; i < w->num_kcontrols; i++) {
         struct snd_soc_dapm_context *dapm = w->dapm;
         struct snd_card *card = dapm->card->snd_card;
         struct snd_kcontrol *kcontrol = snd_soc_cnew(&w->kcontrol_news[i],
                                  w, w->name, NULL);
         int 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, w->kcontrol_news[i].name, ret);
             return ret;
         }
         kcontrol->private_data = w;
         w->kcontrols[i] = kcontrol;
     }
 
     return 0;
 }
 
 /* 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;
     }
 }
 
 static void dapm_widget_list_free(struct snd_soc_dapm_widget_list **list)
 {
     kfree(*list);
 }
 
 static int dapm_widget_list_create(struct snd_soc_dapm_widget_list **list,
     struct list_head *widgets)
 {
     struct snd_soc_dapm_widget *w;
     struct list_head *it;
     unsigned int size = 0;
     unsigned int i = 0;
 
     list_for_each(it, widgets)
         size++;
 
     *list = kzalloc(struct_size(*list, widgets, size), GFP_KERNEL);
     if (*list == NULL)
         return -ENOMEM;
 
     list_for_each_entry(w, widgets, work_list)
         (*list)->widgets[i++] = w;
 
     (*list)->num_widgets = i;
 
     return 0;
 }
 
 /*
  * Recursively reset the cached number of inputs or outputs for the specified
  * widget and all widgets that can be reached via incoming or outcoming paths
  * from the widget.
  */
 static void invalidate_paths_ep(struct snd_soc_dapm_widget *widget,
     enum snd_soc_dapm_direction dir)
 {
     enum snd_soc_dapm_direction rdir = SND_SOC_DAPM_DIR_REVERSE(dir);
     struct snd_soc_dapm_path *path;
 
     widget->endpoints[dir] = -1;
 
     snd_soc_dapm_widget_for_each_path(widget, rdir, path) {
         if (path->weak || path->is_supply)
             continue;
 
         if (path->walking)
             return;
 
         if (path->connect) {
             path->walking = 1;
             invalidate_paths_ep(path->node[dir], dir);
             path->walking = 0;
         }
     }
 }
 
 /*
  * Common implementation for is_connected_output_ep() and
  * is_connected_input_ep(). The function is inlined since the combined size of
  * the two specialized functions is only marginally larger then the size of the
  * generic function and at the same time the fast path of the specialized
  * functions is significantly smaller than the generic function.
  */
 static __always_inline int is_connected_ep(struct snd_soc_dapm_widget *widget,
     struct list_head *list, enum snd_soc_dapm_direction dir,
     int (*fn)(struct snd_soc_dapm_widget *, struct list_head *,
           bool (*custom_stop_condition)(struct snd_soc_dapm_widget *,
                         enum snd_soc_dapm_direction)),
     bool (*custom_stop_condition)(struct snd_soc_dapm_widget *,
                       enum snd_soc_dapm_direction))
 {
     enum snd_soc_dapm_direction rdir = SND_SOC_DAPM_DIR_REVERSE(dir);
     struct snd_soc_dapm_path *path;
     int con = 0;
 
     if (widget->endpoints[dir] >= 0)
         return widget->endpoints[dir];
 
     DAPM_UPDATE_STAT(widget, path_checks);
 
     /* do we need to add this widget to the list ? */
     if (list)
         list_add_tail(&widget->work_list, list);
 
     if (custom_stop_condition && custom_stop_condition(widget, dir)) {
         list = NULL;
         custom_stop_condition = NULL;
     }
 
     if ((widget->is_ep & SND_SOC_DAPM_DIR_TO_EP(dir)) && widget->connected) {
         widget->endpoints[dir] = snd_soc_dapm_suspend_check(widget);
         return widget->endpoints[dir];
     }
 
     snd_soc_dapm_widget_for_each_path(widget, rdir, path) {
         DAPM_UPDATE_STAT(widget, neighbour_checks);
 
         if (path->weak || path->is_supply)
             continue;
 
         if (path->walking)
             return 1;
 
         trace_snd_soc_dapm_path(widget, dir, path);
 
         if (path->connect) {
             path->walking = 1;
             con += fn(path->node[dir], list, custom_stop_condition);
             path->walking = 0;
         }
     }
 
     widget->endpoints[dir] = con;
 
     return con;
 }
 
 /*
  * Recursively check for a completed path to an active or physically connected
  * output widget. Returns number of complete paths.
  *
  * Optionally, can be supplied with a function acting as a stopping condition.
  * This function takes the dapm widget currently being examined and the walk
  * direction as an arguments, it should return true if widgets from that point
  * in the graph onwards should not be added to the widget list.
  */
 static int is_connected_output_ep(struct snd_soc_dapm_widget *widget,
     struct list_head *list,
     bool (*custom_stop_condition)(struct snd_soc_dapm_widget *i,
                       enum snd_soc_dapm_direction))
 {
     return is_connected_ep(widget, list, SND_SOC_DAPM_DIR_OUT,
             is_connected_output_ep, custom_stop_condition);
 }
 
 /*
  * Recursively check for a completed path to an active or physically connected
  * input widget. Returns number of complete paths.
  *
  * Optionally, can be supplied with a function acting as a stopping condition.
  * This function takes the dapm widget currently being examined and the walk
  * direction as an arguments, it should return true if the walk should be
  * stopped and false otherwise.
  */
 static int is_connected_input_ep(struct snd_soc_dapm_widget *widget,
     struct list_head *list,
     bool (*custom_stop_condition)(struct snd_soc_dapm_widget *i,
                       enum snd_soc_dapm_direction))
 {
     return is_connected_ep(widget, list, SND_SOC_DAPM_DIR_IN,
             is_connected_input_ep, custom_stop_condition);
 }
 
 /**
  * snd_soc_dapm_dai_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.
  * @custom_stop_condition: (optional) a function meant to stop the widget graph
  *                         walk based on custom logic.
  *
  * Queries DAPM graph as to whether a 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.
  *
  * Optionally, can be supplied with a function acting as a stopping condition.
  * This function takes the dapm widget currently being examined and the walk
  * direction as an arguments, it should return true if the walk should be
  * stopped and false otherwise.
  *
  * 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,
     bool (*custom_stop_condition)(struct snd_soc_dapm_widget *,
                       enum snd_soc_dapm_direction))
 {
     struct snd_soc_card *card = dai->component->card;
     struct snd_soc_dapm_widget *w;
     LIST_HEAD(widgets);
     int paths;
     int ret;
 
     mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
 
     if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
         w = dai->playback_widget;
         invalidate_paths_ep(w, SND_SOC_DAPM_DIR_OUT);
         paths = is_connected_output_ep(w, &widgets,
                 custom_stop_condition);
     } else {
         w = dai->capture_widget;
         invalidate_paths_ep(w, SND_SOC_DAPM_DIR_IN);
         paths = is_connected_input_ep(w, &widgets,
                 custom_stop_condition);
     }
 
     /* Drop starting point */
     list_del(widgets.next);
 
     ret = dapm_widget_list_create(list, &widgets);
     if (ret)
         paths = ret;
 
     trace_snd_soc_dapm_connected(paths, stream);
     mutex_unlock(&card->dapm_mutex);
 
     return paths;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_dai_get_connected_widgets);
 
 void snd_soc_dapm_dai_free_widgets(struct snd_soc_dapm_widget_list **list)
 {
     dapm_widget_list_free(list);
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_dai_free_widgets);
 
 /*
  * 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 pinctrl widget.
  */
 int dapm_pinctrl_event(struct snd_soc_dapm_widget *w,
                struct snd_kcontrol *kcontrol, int event)
 {
     struct snd_soc_dapm_pinctrl_priv *priv = w->priv;
     struct pinctrl *p = w->pinctrl;
     struct pinctrl_state *s;
 
     if (!p || !priv)
         return -EIO;
 
     if (SND_SOC_DAPM_EVENT_ON(event))
         s = pinctrl_lookup_state(p, priv->active_state);
     else
         s = pinctrl_lookup_state(p, priv->sleep_state);
 
     if (IS_ERR(s))
         return PTR_ERR(s);
 
     return pinctrl_select_state(p, s);
 }
 EXPORT_SYMBOL_GPL(dapm_pinctrl_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);
 
     if (SND_SOC_DAPM_EVENT_ON(event)) {
         return clk_prepare_enable(w->clk);
     } else {
         clk_disable_unprepare(w->clk);
         return 0;
     }
 
     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, NULL);
     out = is_connected_output_ep(w, NULL, NULL);
     return out != 0 && in != 0;
 }
 
 /* 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 */
     snd_soc_dapm_widget_for_each_sink_path(w, path) {
         DAPM_UPDATE_STAT(w, neighbour_checks);
 
         if (path->weak)
             continue;
 
         if (path->connected &&
             !path->connected(path->source, 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 w->connected;
 }
 
 static int dapm_seq_compare(struct snd_soc_dapm_widget *a,
                 struct snd_soc_dapm_widget *b,
                 bool power_up)
 {
     int *sort;
 
     BUILD_BUG_ON(ARRAY_SIZE(dapm_up_seq) != SND_SOC_DAPM_TYPE_COUNT);
     BUILD_BUG_ON(ARRAY_SIZE(dapm_down_seq) != SND_SOC_DAPM_TYPE_COUNT);
 
     if (power_up)
         sort = dapm_up_seq;
     else
         sort = dapm_down_seq;
 
     WARN_ONCE(sort[a->id] == 0, "offset a->id %d not initialized\n", a->id);
     WARN_ONCE(sort[b->id] == 0, "offset b->id %d not initialized\n", b->id);
 
     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;
 
     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)) {
         int ret;
 
         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_context *dapm;
     struct snd_soc_dapm_widget *w;
     int reg;
     unsigned int value = 0;
     unsigned int mask = 0;
 
     w = list_first_entry(pending, struct snd_soc_dapm_widget, power_list);
     reg = w->reg;
     dapm = w->dapm;
 
     list_for_each_entry(w, pending, power_list) {
         WARN_ON(reg != w->reg || dapm != w->dapm);
         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(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.
          */
 
         pop_dbg(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_dapm_update_bits(dapm, 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 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) {
         int 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->component) {
                 for (i = 0; i < ARRAY_SIZE(dapm_up_seq); i++)
                     if (sort[i] == cur_sort)
                         snd_soc_component_seq_notifier(
                             cur_dapm->component,
                             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)
                 continue;
 
             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)
                 continue;
 
             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->component) {
         for (i = 0; i < ARRAY_SIZE(dapm_up_seq); i++)
             if (sort[i] == cur_sort)
                 snd_soc_component_seq_notifier(
                     cur_dapm->component,
                     i, cur_subseq);
     }
 
     for_each_card_dapms(card, d)
         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_each_dapm_widgets(wlist, wi, w) {
         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_dapm_update_bits(w->dapm, update->reg, update->mask,
         update->val);
     if (ret < 0)
         dev_err(w->dapm->dev, "ASoC: %s DAPM update failed: %d\n",
             w->name, ret);
 
     if (update->has_second_set) {
         ret = soc_dapm_update_bits(w->dapm, update->reg2,
                        update->mask2, update->val2);
         if (ret < 0)
             dev_err(w->dapm->dev,
                 "ASoC: %s DAPM update failed: %d\n",
                 w->name, ret);
     }
 
     for_each_dapm_widgets(wlist, wi, w) {
         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 go into STANDBY */
     if (d->bias_level == SND_SOC_BIAS_OFF &&
         d->target_bias_level != SND_SOC_BIAS_OFF) {
         if (d->dev && cookie)
             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 && cookie)
             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.
      */
     snd_soc_dapm_widget_for_each_source_path(w, path)
         dapm_widget_set_peer_power(path->source, power, path->connect);
 
     /* Supplies can't affect their outputs, only their inputs */
     if (!w->is_supply) {
         snd_soc_dapm_widget_for_each_sink_path(w, path)
             dapm_widget_set_peer_power(path->sink, power,
                            path->connect);
     }
 
     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;
     }
 }
 
 static bool dapm_idle_bias_off(struct snd_soc_dapm_context *dapm)
 {
     if (dapm->idle_bias_off)
         return true;
 
     switch (snd_power_get_state(dapm->card->snd_card)) {
     case SNDRV_CTL_POWER_D3hot:
     case SNDRV_CTL_POWER_D3cold:
         return dapm->suspend_bias_off;
     default:
         break;
     }
 
     return false;
 }
 
 /*
  * 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;
     int ret;
 
     lockdep_assert_held(&card->dapm_mutex);
 
     trace_snd_soc_dapm_start(card);
 
     for_each_card_dapms(card, d) {
         if (dapm_idle_bias_off(d))
             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);
     }
 
     for_each_card_widgets(card, w) {
         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_pinctrl:
             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;
     for_each_card_dapms(card, d)
         if (d->target_bias_level > bias)
             bias = d->target_bias_level;
     for_each_card_dapms(card, d)
         if (!dapm_idle_bias_off(d))
             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 */
     for_each_card_dapms(card, d) {
         if (d != &card->dapm && d->bias_level != d->target_bias_level)
             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 */
     for_each_card_dapms(card, d) {
         if (d != &card->dapm && d->bias_level != d->target_bias_level)
             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 */
     for_each_card_dapms(card, d) {
         if (!d->component)
             continue;
 
         ret = snd_soc_component_stream_event(d->component, event);
         if (ret < 0)
             return ret;
     }
 
     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;
     struct snd_soc_card *card = w->dapm->card;
     enum snd_soc_dapm_direction dir, rdir;
     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;
 
     mutex_lock(&card->dapm_mutex);
 
     /* Supply widgets are not handled by is_connected_{input,output}_ep() */
     if (w->is_supply) {
         in = 0;
         out = 0;
     } else {
         in = is_connected_input_ep(w, NULL, NULL);
         out = is_connected_output_ep(w, NULL, NULL);
     }
 
     ret = scnprintf(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 += scnprintf(buf + ret, PAGE_SIZE - ret,
                 " - R%d(0x%x) mask 0x%x",
                 w->reg, w->reg, w->mask << w->shift);
 
     ret += scnprintf(buf + ret, PAGE_SIZE - ret, "\n");
 
     if (w->sname)
         ret += scnprintf(buf + ret, PAGE_SIZE - ret, " stream %s %s\n",
                 w->sname,
                 w->active ? "active" : "inactive");
 
     snd_soc_dapm_for_each_direction(dir) {
         rdir = SND_SOC_DAPM_DIR_REVERSE(dir);
         snd_soc_dapm_widget_for_each_path(w, dir, p) {
             if (p->connected && !p->connected(p->source, p->sink))
                 continue;
 
             if (!p->connect)
                 continue;
 
             ret += scnprintf(buf + ret, PAGE_SIZE - ret,
                     " %s  \"%s\" \"%s\"\n",
                     (rdir == SND_SOC_DAPM_DIR_IN) ? "in" : "out",
                     p->name ? p->name : "static",
                     p->node[rdir]->name);
         }
     }
 
     mutex_unlock(&card->dapm_mutex);
 
     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)
 {
     if (!parent || IS_ERR(parent))
         return;
 
     dapm->debugfs_dapm = debugfs_create_dir("dapm", parent);
 
     debugfs_create_file("bias_level", 0444, dapm->debugfs_dapm, dapm,
                 &dapm_bias_fops);
 }
 
 static void dapm_debugfs_add_widget(struct snd_soc_dapm_widget *w)
 {
     struct snd_soc_dapm_context *dapm = w->dapm;
 
     if (!dapm->debugfs_dapm || !w->name)
         return;
 
     debugfs_create_file(w->name, 0444, dapm->debugfs_dapm, w,
                 &dapm_widget_power_fops);
 }
 
 static void dapm_debugfs_cleanup(struct snd_soc_dapm_context *dapm)
 {
     debugfs_remove_recursive(dapm->debugfs_dapm);
     dapm->debugfs_dapm = NULL;
 }
 
 #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
 
 /*
  * soc_dapm_connect_path() - Connects or disconnects a path
  * @path: The path to update
  * @connect: The new connect state of the path. True if the path is connected,
  *  false if it is disconnected.
  * @reason: The reason why the path changed (for debugging only)
  */
 static void soc_dapm_connect_path(struct snd_soc_dapm_path *path,
     bool connect, const char *reason)
 {
     if (path->connect == connect)
         return;
 
     path->connect = connect;
     dapm_mark_dirty(path->source, reason);
     dapm_mark_dirty(path->sink, reason);
     dapm_path_invalidate(path);
 }
 
 /* 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;
     bool connect;
 
     lockdep_assert_held(&card->dapm_mutex);
 
     /* find dapm widget path assoc with kcontrol */
     dapm_kcontrol_for_each_path(path, kcontrol) {
         found = 1;
         /* we now need to match the string in the enum to the path */
         if (e && !(strcmp(path->name, e->texts[mux])))
             connect = true;
         else
             connect = false;
 
         soc_dapm_connect_path(path, connect, "mux update");
     }
 
     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)
         snd_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, int rconnect)
 {
     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) {
         /*
          * Ideally this function should support any number of
          * paths and channels. But since kcontrols only come
          * in mono and stereo variants, we are limited to 2
          * channels.
          *
          * The following code assumes for stereo controls the
          * first path (when 'found == 0') is the left channel,
          * and all remaining paths (when 'found == 1') are the
          * right channel.
          *
          * A stereo control is signified by a valid 'rconnect'
          * value, either 0 for unconnected, or >= 0 for connected.
          * This is chosen instead of using snd_soc_volsw_is_stereo,
          * so that the behavior of snd_soc_dapm_mixer_update_power
          * doesn't change even when the kcontrol passed in is
          * stereo.
          *
          * It passes 'connect' as the path connect status for
          * the left channel, and 'rconnect' for the right
          * channel.
          */
         if (found && rconnect >= 0)
             soc_dapm_connect_path(path, rconnect, "mixer update");
         else
             soc_dapm_connect_path(path, connect, "mixer update");
         found = 1;
     }
 
     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, -1);
     card->update = NULL;
     mutex_unlock(&card->dapm_mutex);
     if (ret > 0)
         snd_soc_dpcm_runtime_update(card);
     return ret;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_mixer_update_power);
 
 static ssize_t dapm_widget_show_component(struct snd_soc_component *cmpnt,
     char *buf)
 {
     struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(cmpnt);
     struct snd_soc_dapm_widget *w;
     int count = 0;
     char *state = "not set";
 
     /* card won't be set for the dummy component, as a spot fix
      * we're checking for that case specifically here but in future
      * we will ensure that the dummy component looks like others.
      */
     if (!cmpnt->card)
         return 0;
 
     for_each_card_widgets(cmpnt->card, w) {
         if (w->dapm != dapm)
             continue;
 
         /* only display widgets that burn 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_effect:
         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_pinctrl:
         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 (snd_soc_dapm_get_bias_level(dapm)) {
     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;
 }
 
 /* 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_dai *codec_dai;
     int i, count = 0;
 
     mutex_lock(&rtd->card->dapm_mutex);
 
     for_each_rtd_codec_dais(rtd, i, codec_dai) {
         struct snd_soc_component *cmpnt = codec_dai->component;
 
         count += dapm_widget_show_component(cmpnt, buf + count);
     }
 
     mutex_unlock(&rtd->card->dapm_mutex);
 
     return count;
 }
 
 static DEVICE_ATTR_RO(dapm_widget);
 
 struct attribute *soc_dapm_dev_attrs[] = {
     &dev_attr_dapm_widget.attr,
     NULL
 };
 
 static void dapm_free_path(struct snd_soc_dapm_path *path)
 {
     list_del(&path->list_node[SND_SOC_DAPM_DIR_IN]);
     list_del(&path->list_node[SND_SOC_DAPM_DIR_OUT]);
     list_del(&path->list_kcontrol);
     list_del(&path->list);
     kfree(path);
 }
 
 /**
  * snd_soc_dapm_free_widget - Free specified widget
  * @w: widget to free
  *
  * Removes widget from all paths and frees memory occupied by it.
  */
 void snd_soc_dapm_free_widget(struct snd_soc_dapm_widget *w)
 {
     struct snd_soc_dapm_path *p, *next_p;
     enum snd_soc_dapm_direction dir;
 
     list_del(&w->list);
     list_del(&w->dirty);
     /*
      * 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.
      */
     snd_soc_dapm_for_each_direction(dir) {
         snd_soc_dapm_widget_for_each_path_safe(w, dir, p, next_p)
             dapm_free_path(p);
     }
 
     kfree(w->kcontrols);
     kfree_const(w->name);
     kfree_const(w->sname);
     kfree(w);
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_free_widget);
 
 void snd_soc_dapm_reset_cache(struct snd_soc_dapm_context *dapm)
 {
     dapm->path_sink_cache.widget = NULL;
     dapm->path_source_cache.widget = NULL;
 }
 
 /* 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;
 
     for_each_card_widgets_safe(dapm->card, w, next_w) {
         if (w->dapm != dapm)
             continue;
         snd_soc_dapm_free_widget(w);
     }
     snd_soc_dapm_reset_cache(dapm);
 }
 
 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;
     char prefixed_pin[80];
     const char *pin_name;
     const char *prefix = soc_dapm_prefix(dapm);
 
     if (prefix) {
         snprintf(prefixed_pin, sizeof(prefixed_pin), "%s %s",
              prefix, pin);
         pin_name = prefixed_pin;
     } else {
         pin_name = pin;
     }
 
     for_each_card_widgets(dapm->card, w) {
         if (!strcmp(w->name, pin_name)) {
             if (w->dapm == dapm)
                 return w;
             else
                 fallback = w;
         }
     }
 
     if (search_other_contexts)
         return fallback;
 
     return NULL;
 }
 
 /*
  * set the DAPM pin status:
  * returns 1 when the value has been updated, 0 when unchanged, or a negative
  * error code; called from kcontrol put callback
  */
 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);
     int ret = 0;
 
     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");
         dapm_widget_invalidate_input_paths(w);
         dapm_widget_invalidate_output_paths(w);
         ret = 1;
     }
 
     w->connected = status;
     if (status == 0)
         w->force = 0;
 
     return ret;
 }
 
 /*
  * similar as __snd_soc_dapm_set_pin(), but returns 0 when successful;
  * called from several API functions below
  */
 static int snd_soc_dapm_set_pin(struct snd_soc_dapm_context *dapm,
                 const char *pin, int status)
 {
     int ret = __snd_soc_dapm_set_pin(dapm, pin, status);
 
     return ret < 0 ? ret : 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 dapm_update_dai_chan(struct snd_soc_dapm_path *p,
                 struct snd_soc_dapm_widget *w,
                 int channels)
 {
     switch (w->id) {
     case snd_soc_dapm_aif_out:
     case snd_soc_dapm_aif_in:
         break;
     default:
         return 0;
     }
 
     dev_dbg(w->dapm->dev, "%s DAI route %s -> %s\n",
         w->channel < channels ? "Connecting" : "Disconnecting",
         p->source->name, p->sink->name);
 
     if (w->channel < channels)
         soc_dapm_connect_path(p, true, "dai update");
     else
         soc_dapm_connect_path(p, false, "dai update");
 
     return 0;
 }
 
 static int dapm_update_dai_unlocked(struct snd_pcm_substream *substream,
                     struct snd_pcm_hw_params *params,
                     struct snd_soc_dai *dai)
 {
     int dir = substream->stream;
     int channels = params_channels(params);
     struct snd_soc_dapm_path *p;
     struct snd_soc_dapm_widget *w;
     int ret;
 
     w = snd_soc_dai_get_widget(dai, dir);
 
     if (!w)
         return 0;
 
     dev_dbg(dai->dev, "Update DAI routes for %s %s\n", dai->name,
         dir == SNDRV_PCM_STREAM_PLAYBACK ? "playback" : "capture");
 
     snd_soc_dapm_widget_for_each_sink_path(w, p) {
         ret = dapm_update_dai_chan(p, p->sink, channels);
         if (ret < 0)
             return ret;
     }
 
     snd_soc_dapm_widget_for_each_source_path(w, p) {
         ret = dapm_update_dai_chan(p, p->source, channels);
         if (ret < 0)
             return ret;
     }
 
     return 0;
 }
 
 int snd_soc_dapm_update_dai(struct snd_pcm_substream *substream,
                 struct snd_pcm_hw_params *params,
                 struct snd_soc_dai *dai)
 {
     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
     int ret;
 
     mutex_lock_nested(&rtd->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
     ret = dapm_update_dai_unlocked(substream, params, dai);
     mutex_unlock(&rtd->card->dapm_mutex);
 
     return ret;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_update_dai);
 
 /*
  * dapm_update_widget_flags() - Re-compute widget sink and source flags
  * @w: The widget for which to update the flags
  *
  * Some widgets have a dynamic category which depends on which neighbors they
  * are connected to. This function update the category for these widgets.
  *
  * This function must be called whenever a path is added or removed to a widget.
  */
 static void dapm_update_widget_flags(struct snd_soc_dapm_widget *w)
 {
     enum snd_soc_dapm_direction dir;
     struct snd_soc_dapm_path *p;
     unsigned int ep;
 
     switch (w->id) {
     case snd_soc_dapm_input:
         /* On a fully routed card an input is never a source */
         if (w->dapm->card->fully_routed)
             return;
         ep = SND_SOC_DAPM_EP_SOURCE;
         snd_soc_dapm_widget_for_each_source_path(w, p) {
             if (p->source->id == snd_soc_dapm_micbias ||
                 p->source->id == snd_soc_dapm_mic ||
                 p->source->id == snd_soc_dapm_line ||
                 p->source->id == snd_soc_dapm_output) {
                     ep = 0;
                     break;
             }
         }
         break;
     case snd_soc_dapm_output:
         /* On a fully routed card a output is never a sink */
         if (w->dapm->card->fully_routed)
             return;
         ep = SND_SOC_DAPM_EP_SINK;
         snd_soc_dapm_widget_for_each_sink_path(w, p) {
             if (p->sink->id == snd_soc_dapm_spk ||
                 p->sink->id == snd_soc_dapm_hp ||
                 p->sink->id == snd_soc_dapm_line ||
                 p->sink->id == snd_soc_dapm_input) {
                     ep = 0;
                     break;
             }
         }
         break;
     case snd_soc_dapm_line:
         ep = 0;
         snd_soc_dapm_for_each_direction(dir) {
             if (!list_empty(&w->edges[dir]))
                 ep |= SND_SOC_DAPM_DIR_TO_EP(dir);
         }
         break;
     default:
         return;
     }
 
     w->is_ep = ep;
 }
 
 static int snd_soc_dapm_check_dynamic_path(struct snd_soc_dapm_context *dapm,
     struct snd_soc_dapm_widget *source, struct snd_soc_dapm_widget *sink,
     const char *control)
 {
     bool dynamic_source = false;
     bool dynamic_sink = false;
 
     if (!control)
         return 0;
 
     switch (source->id) {
     case snd_soc_dapm_demux:
         dynamic_source = true;
         break;
     default:
         break;
     }
 
     switch (sink->id) {
     case snd_soc_dapm_mux:
     case snd_soc_dapm_switch:
     case snd_soc_dapm_mixer:
     case snd_soc_dapm_mixer_named_ctl:
         dynamic_sink = true;
         break;
     default:
         break;
     }
 
     if (dynamic_source && dynamic_sink) {
         dev_err(dapm->dev,
             "Direct connection between demux and mixer/mux not supported for path %s -> [%s] -> %s\n",
             source->name, control, sink->name);
         return -EINVAL;
     } else if (!dynamic_source && !dynamic_sink) {
         dev_err(dapm->dev,
             "Control not supported for path %s -> [%s] -> %s\n",
             source->name, control, sink->name);
         return -EINVAL;
     }
 
     return 0;
 }
 
 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_widget *widgets[2];
     enum snd_soc_dapm_direction dir;
     struct snd_soc_dapm_path *path;
     int ret;
 
     if (wsink->is_supply && !wsource->is_supply) {
         dev_err(dapm->dev,
             "Connecting non-supply widget to supply widget is not supported (%s -> %s)\n",
             wsource->name, wsink->name);
         return -EINVAL;
     }
 
     if (connected && !wsource->is_supply) {
         dev_err(dapm->dev,
             "connected() callback only supported for supply widgets (%s -> %s)\n",
             wsource->name, wsink->name);
         return -EINVAL;
     }
 
     if (wsource->is_supply && control) {
         dev_err(dapm->dev,
             "Conditional paths are not supported for supply widgets (%s -> [%s] -> %s)\n",
             wsource->name, control, wsink->name);
         return -EINVAL;
     }
 
     ret = snd_soc_dapm_check_dynamic_path(dapm, wsource, wsink, control);
     if (ret)
         return ret;
 
     path = kzalloc(sizeof(struct snd_soc_dapm_path), GFP_KERNEL);
     if (!path)
         return -ENOMEM;
 
     path->node[SND_SOC_DAPM_DIR_IN] = wsource;
     path->node[SND_SOC_DAPM_DIR_OUT] = wsink;
     widgets[SND_SOC_DAPM_DIR_IN] = wsource;
     widgets[SND_SOC_DAPM_DIR_OUT] = wsink;
 
     path->connected = connected;
     INIT_LIST_HEAD(&path->list);
     INIT_LIST_HEAD(&path->list_kcontrol);
 
     if (wsource->is_supply || wsink->is_supply)
         path->is_supply = 1;
 
     /* connect static paths */
     if (control == NULL) {
         path->connect = 1;
     } else {
         switch (wsource->id) {
         case snd_soc_dapm_demux:
             ret = dapm_connect_mux(dapm, path, control, wsource);
             if (ret)
                 goto err;
             break;
         default:
             break;
         }
 
         switch (wsink->id) {
         case snd_soc_dapm_mux:
             ret = dapm_connect_mux(dapm, path, control, wsink);
             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, path, control);
             if (ret != 0)
                 goto err;
             break;
         default:
             break;
         }
     }
 
     list_add(&path->list, &dapm->card->paths);
     snd_soc_dapm_for_each_direction(dir)
         list_add(&path->list_node[dir], &widgets[dir]->edges[dir]);
 
     snd_soc_dapm_for_each_direction(dir) {
         dapm_update_widget_flags(widgets[dir]);
         dapm_mark_dirty(widgets[dir], "Route added");
     }
 
     if (dapm->card->instantiated && path->connect)
         dapm_path_invalidate(path);
 
     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];
     const char *prefix;
     unsigned int sink_ref = 0;
     unsigned int source_ref = 0;
     int ret;
 
     prefix = soc_dapm_prefix(dapm);
     if (prefix) {
         snprintf(prefixed_sink, sizeof(prefixed_sink), "%s %s",
              prefix, route->sink);
         sink = prefixed_sink;
         snprintf(prefixed_source, sizeof(prefixed_source), "%s %s",
              prefix, route->source);
         source = prefixed_source;
     } else {
         sink = route->sink;
         source = route->source;
     }
 
     wsource = dapm_wcache_lookup(&dapm->path_source_cache, source);
     wsink = dapm_wcache_lookup(&dapm->path_sink_cache, sink);
 
     if (wsink && wsource)
         goto skip_search;
 
     /*
      * find src and dest widgets over all widgets but favor a widget from
      * current DAPM context
      */
     for_each_card_widgets(dapm->card, w) {
         if (!wsink && !(strcmp(w->name, sink))) {
             wtsink = w;
             if (w->dapm == dapm) {
                 wsink = w;
                 if (wsource)
                     break;
             }
             sink_ref++;
             if (sink_ref > 1)
                 dev_warn(dapm->dev,
                     "ASoC: sink widget %s overwritten\n",
                     w->name);
             continue;
         }
         if (!wsource && !(strcmp(w->name, source))) {
             wtsource = w;
             if (w->dapm == dapm) {
                 wsource = w;
                 if (wsink)
                     break;
             }
             source_ref++;
             if (source_ref > 1)
                 dev_warn(dapm->dev,
                     "ASoC: source widget %s overwritten\n",
                     w->name);
         }
     }
     /* 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;
     }
 
 skip_search:
     dapm_wcache_update(&dapm->path_sink_cache, wsink);
     dapm_wcache_update(&dapm->path_source_cache, wsource);
 
     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];
     const char *prefix;
 
     if (route->control) {
         dev_err(dapm->dev,
             "ASoC: Removal of routes with controls not supported\n");
         return -EINVAL;
     }
 
     prefix = soc_dapm_prefix(dapm);
     if (prefix) {
         snprintf(prefixed_sink, sizeof(prefixed_sink), "%s %s",
              prefix, route->sink);
         sink = prefixed_sink;
         snprintf(prefixed_source, sizeof(prefixed_source), "%s %s",
              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) {
         struct snd_soc_dapm_widget *wsource = path->source;
         struct snd_soc_dapm_widget *wsink = path->sink;
 
         dapm_mark_dirty(wsource, "Route removed");
         dapm_mark_dirty(wsink, "Route removed");
         if (path->connect)
             dapm_path_invalidate(path);
 
         dapm_free_path(path);
 
         /* Update any path related flags */
         dapm_update_widget_flags(wsource);
         dapm_update_widget_flags(wsink);
     } 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, ret = 0;
 
     mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
     for (i = 0; i < num; i++) {
         int 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;
 
     mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
     for (i = 0; i < num; i++) {
         snd_soc_dapm_del_route(dapm, route);
         route++;
     }
     mutex_unlock(&dapm->card->dapm_mutex);
 
     return 0;
 }
 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);
 
     snd_soc_dapm_widget_for_each_sink_path(source, path) {
         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;
     int ret = 0;
 
     mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
     for (i = 0; i < num; i++) {
         int 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
  * @card: card to be checked for new dapm widgets
  *
  * 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);
 
     for_each_card_widgets(card, w)
     {
         if (w->new)
             continue;
 
         if (w->num_kcontrols) {
             w->kcontrols = kcalloc(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:
         case snd_soc_dapm_demux:
             dapm_new_mux(w);
             break;
         case snd_soc_dapm_pga:
         case snd_soc_dapm_effect:
         case snd_soc_dapm_out_drv:
             dapm_new_pga(w);
             break;
         case snd_soc_dapm_dai_link:
             dapm_new_dai_link(w);
             break;
         default:
             break;
         }
 
         /* Read the initial power state from the device */
         if (w->reg >= 0) {
             val = soc_dapm_read(w->dapm, w->reg);
             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_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
     struct snd_soc_card *card = dapm->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 width = fls(max);
     unsigned int mask = (1 << fls(max)) - 1;
     unsigned int invert = mc->invert;
     unsigned int reg_val, val, rval = 0;
 
     mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
     if (dapm_kcontrol_is_powered(kcontrol) && reg != SND_SOC_NOPM) {
         reg_val = soc_dapm_read(dapm, reg);
         val = (reg_val >> shift) & mask;
 
         if (reg != mc->rreg)
             reg_val = soc_dapm_read(dapm, mc->rreg);
 
         if (snd_soc_volsw_is_stereo(mc))
             rval = (reg_val >> mc->rshift) & mask;
     } else {
         reg_val = dapm_kcontrol_get_value(kcontrol);
         val = reg_val & mask;
 
         if (snd_soc_volsw_is_stereo(mc))
             rval = (reg_val >> width) & mask;
     }
     mutex_unlock(&card->dapm_mutex);
 
     if (invert)
         ucontrol->value.integer.value[0] = max - val;
     else
         ucontrol->value.integer.value[0] = val;
 
     if (snd_soc_volsw_is_stereo(mc)) {
         if (invert)
             ucontrol->value.integer.value[1] = max - rval;
         else
             ucontrol->value.integer.value[1] = rval;
     }
 
     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_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
     struct snd_soc_card *card = dapm->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 width = fls(max);
     unsigned int mask = (1 << width) - 1;
     unsigned int invert = mc->invert;
     unsigned int val, rval = 0;
     int connect, rconnect = -1, change, reg_change = 0;
     struct snd_soc_dapm_update update = {};
     int ret = 0;
 
     val = (ucontrol->value.integer.value[0] & mask);
     connect = !!val;
 
     if (invert)
         val = max - val;
 
     if (snd_soc_volsw_is_stereo(mc)) {
         rval = (ucontrol->value.integer.value[1] & mask);
         rconnect = !!rval;
         if (invert)
             rval = max - rval;
     }
 
     mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
 
     /* This assumes field width < (bits in unsigned int / 2) */
     if (width > sizeof(unsigned int) * 8 / 2)
         dev_warn(dapm->dev,
              "ASoC: control %s field width limit exceeded\n",
              kcontrol->id.name);
     change = dapm_kcontrol_set_value(kcontrol, val | (rval << width));
 
     if (reg != SND_SOC_NOPM) {
         val = val << shift;
         rval = rval << mc->rshift;
 
         reg_change = soc_dapm_test_bits(dapm, reg, mask << shift, val);
 
         if (snd_soc_volsw_is_stereo(mc))
             reg_change |= soc_dapm_test_bits(dapm, mc->rreg,
                              mask << mc->rshift,
                              rval);
     }
 
     if (change || reg_change) {
         if (reg_change) {
             if (snd_soc_volsw_is_stereo(mc)) {
                 update.has_second_set = true;
                 update.reg2 = mc->rreg;
                 update.mask2 = mask << mc->rshift;
                 update.val2 = rval;
             }
             update.kcontrol = kcontrol;
             update.reg = reg;
             update.mask = mask << shift;
             update.val = val;
             card->update = &update;
         }
 
         ret = soc_dapm_mixer_update_power(card, kcontrol, connect,
                           rconnect);
 
         card->update = NULL;
     }
 
     mutex_unlock(&card->dapm_mutex);
 
     if (ret > 0)
         snd_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_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
     struct snd_soc_card *card = dapm->card;
     struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
     unsigned int reg_val, val;
 
     mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
     if (e->reg != SND_SOC_NOPM && dapm_kcontrol_is_powered(kcontrol)) {
         reg_val = soc_dapm_read(dapm, e->reg);
     } else {
         reg_val = dapm_kcontrol_get_value(kcontrol);
     }
     mutex_unlock(&card->dapm_mutex);
 
     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_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
     struct snd_soc_card *card = dapm->card;
     struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
     unsigned int *item = ucontrol->value.enumerated.item;
     unsigned int val, change, reg_change = 0;
     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_r;
         mask |= e->mask << e->shift_r;
     }
 
     mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
 
     change = dapm_kcontrol_set_value(kcontrol, val);
 
     if (e->reg != SND_SOC_NOPM)
         reg_change = soc_dapm_test_bits(dapm, e->reg, mask, val);
 
     if (change || reg_change) {
         if (reg_change) {
             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)
         snd_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;
     int ret;
 
     mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
     ret = __snd_soc_dapm_set_pin(&card->dapm, pin,
                      !!ucontrol->value.integer.value[0]);
     mutex_unlock(&card->dapm_mutex);
 
     snd_soc_dapm_sync(&card->dapm);
     return ret;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_put_pin_switch);
 
 struct snd_soc_dapm_widget *
 snd_soc_dapm_new_control_unlocked(struct snd_soc_dapm_context *dapm,
              const struct snd_soc_dapm_widget *widget)
 {
     enum snd_soc_dapm_direction dir;
     struct snd_soc_dapm_widget *w;
     const char *prefix;
     int ret;
 
     if ((w = dapm_cnew_widget(widget)) == NULL)
         return ERR_PTR(-ENOMEM);
 
     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);
             goto request_failed;
         }
 
         if (w->on_val & SND_SOC_DAPM_REGULATOR_BYPASS) {
             ret = regulator_allow_bypass(w->regulator, true);
             if (ret != 0)
                 dev_warn(dapm->dev,
                      "ASoC: Failed to bypass %s: %d\n",
                      w->name, ret);
         }
         break;
     case snd_soc_dapm_pinctrl:
         w->pinctrl = devm_pinctrl_get(dapm->dev);
         if (IS_ERR(w->pinctrl)) {
             ret = PTR_ERR(w->pinctrl);
             goto request_failed;
         }
 
         /* set to sleep_state when initializing */
         dapm_pinctrl_event(w, NULL, SND_SOC_DAPM_POST_PMD);
         break;
     case snd_soc_dapm_clock_supply:
         w->clk = devm_clk_get(dapm->dev, w->name);
         if (IS_ERR(w->clk)) {
             ret = PTR_ERR(w->clk);
             goto request_failed;
         }
         break;
     default:
         break;
     }
 
     prefix = soc_dapm_prefix(dapm);
     if (prefix)
         w->name = kasprintf(GFP_KERNEL, "%s %s", prefix, widget->name);
     else
         w->name = kstrdup_const(widget->name, GFP_KERNEL);
     if (w->name == NULL) {
         kfree_const(w->sname);
         kfree(w);
         return ERR_PTR(-ENOMEM);
     }
 
     switch (w->id) {
     case snd_soc_dapm_mic:
         w->is_ep = SND_SOC_DAPM_EP_SOURCE;
         w->power_check = dapm_generic_check_power;
         break;
     case snd_soc_dapm_input:
         if (!dapm->card->fully_routed)
             w->is_ep = SND_SOC_DAPM_EP_SOURCE;
         w->power_check = dapm_generic_check_power;
         break;
     case snd_soc_dapm_spk:
     case snd_soc_dapm_hp:
         w->is_ep = SND_SOC_DAPM_EP_SINK;
         w->power_check = dapm_generic_check_power;
         break;
     case snd_soc_dapm_output:
         if (!dapm->card->fully_routed)
             w->is_ep = SND_SOC_DAPM_EP_SINK;
         w->power_check = dapm_generic_check_power;
         break;
     case snd_soc_dapm_vmid:
     case snd_soc_dapm_siggen:
         w->is_ep = SND_SOC_DAPM_EP_SOURCE;
         w->power_check = dapm_always_on_check_power;
         break;
     case snd_soc_dapm_sink:
         w->is_ep = SND_SOC_DAPM_EP_SINK;
         w->power_check = dapm_always_on_check_power;
         break;
 
     case snd_soc_dapm_mux:
     case snd_soc_dapm_demux:
     case snd_soc_dapm_switch:
     case snd_soc_dapm_mixer:
     case snd_soc_dapm_mixer_named_ctl:
     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_buffer:
     case snd_soc_dapm_scheduler:
     case snd_soc_dapm_effect:
     case snd_soc_dapm_src:
     case snd_soc_dapm_asrc:
     case snd_soc_dapm_encoder:
     case snd_soc_dapm_decoder:
     case snd_soc_dapm_out_drv:
     case snd_soc_dapm_micbias:
     case snd_soc_dapm_line:
     case snd_soc_dapm_dai_link:
     case snd_soc_dapm_dai_out:
     case snd_soc_dapm_dai_in:
         w->power_check = dapm_generic_check_power;
         break;
     case snd_soc_dapm_supply:
     case snd_soc_dapm_regulator_supply:
     case snd_soc_dapm_pinctrl:
     case snd_soc_dapm_clock_supply:
     case snd_soc_dapm_kcontrol:
         w->is_supply = 1;
         w->power_check = dapm_supply_check_power;
         break;
     default:
         w->power_check = dapm_always_on_check_power;
         break;
     }
 
     w->dapm = dapm;
     INIT_LIST_HEAD(&w->list);
     INIT_LIST_HEAD(&w->dirty);
     /* see for_each_card_widgets */
     list_add_tail(&w->list, &dapm->card->widgets);
 
     snd_soc_dapm_for_each_direction(dir) {
         INIT_LIST_HEAD(&w->edges[dir]);
         w->endpoints[dir] = -1;
     }
 
     /* machine layer sets up unconnected pins and insertions */
     w->connected = 1;
     return w;
 
 request_failed:
     if (ret != -EPROBE_DEFER)
         dev_err(dapm->dev, "ASoC: Failed to request %s: %d\n",
             w->name, ret);
 
     kfree_const(w->sname);
     kfree(w);
     return ERR_PTR(ret);
 }
 
 /**
  * snd_soc_dapm_new_control - create new dapm control
  * @dapm: DAPM context
  * @widget: widget template
  *
  * Creates new DAPM control based upon a template.
  *
  * Returns a widget pointer on success or an error pointer on failure
  */
 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;
 
     mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
     w = snd_soc_dapm_new_control_unlocked(dapm, widget);
     mutex_unlock(&dapm->card->dapm_mutex);
 
     return w;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_new_control);
 
 /**
  * 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)
 {
     int i;
     int ret = 0;
 
     mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
     for (i = 0; i < num; i++) {
         struct snd_soc_dapm_widget *w = snd_soc_dapm_new_control_unlocked(dapm, widget);
         if (IS_ERR(w)) {
             ret = PTR_ERR(w);
             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_pre_pmu(struct snd_soc_dapm_widget *w,
                    struct snd_pcm_substream *substream)
 {
     struct snd_soc_dapm_path *path;
     struct snd_soc_dai *source, *sink;
     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
     struct snd_pcm_hw_params *params = NULL;
     const struct snd_soc_pcm_stream *config = NULL;
     struct snd_pcm_runtime *runtime = NULL;
     unsigned int fmt;
     int ret = 0;
 
     params = kzalloc(sizeof(*params), GFP_KERNEL);
     if (!params)
         return -ENOMEM;
 
     runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
     if (!runtime) {
         ret = -ENOMEM;
         goto out;
     }
 
     substream->runtime = runtime;
 
     substream->stream = SNDRV_PCM_STREAM_CAPTURE;
     snd_soc_dapm_widget_for_each_source_path(w, path) {
         source = path->source->priv;
 
         ret = snd_soc_dai_startup(source, substream);
         if (ret < 0)
             goto out;
 
         snd_soc_dai_activate(source, substream->stream);
     }
 
     substream->stream = SNDRV_PCM_STREAM_PLAYBACK;
     snd_soc_dapm_widget_for_each_sink_path(w, path) {
         sink = path->sink->priv;
 
         ret = snd_soc_dai_startup(sink, substream);
         if (ret < 0)
             goto out;
 
         snd_soc_dai_activate(sink, substream->stream);
     }
 
     substream->hw_opened = 1;
 
     /*
      * Note: getting the config after .startup() gives a chance to
      * either party on the link to alter the configuration if
      * necessary
      */
     config = rtd->dai_link->params + rtd->params_select;
     if (WARN_ON(!config)) {
         dev_err(w->dapm->dev, "ASoC: link config missing\n");
         ret = -EINVAL;
         goto out;
     }
 
     /* 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);
 
         ret = -EINVAL;
         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;
 
     substream->stream = SNDRV_PCM_STREAM_CAPTURE;
     snd_soc_dapm_widget_for_each_source_path(w, path) {
         source = path->source->priv;
 
         ret = snd_soc_dai_hw_params(source, substream, params);
         if (ret < 0)
             goto out;
 
         dapm_update_dai_unlocked(substream, params, source);
     }
 
     substream->stream = SNDRV_PCM_STREAM_PLAYBACK;
     snd_soc_dapm_widget_for_each_sink_path(w, path) {
         sink = path->sink->priv;
 
         ret = snd_soc_dai_hw_params(sink, substream, params);
         if (ret < 0)
             goto out;
 
         dapm_update_dai_unlocked(substream, params, sink);
     }
 
     runtime->format = params_format(params);
     runtime->subformat = params_subformat(params);
     runtime->channels = params_channels(params);
     runtime->rate = params_rate(params);
 
 out:
     kfree(params);
     return ret;
 }
 
 static int snd_soc_dai_link_event(struct snd_soc_dapm_widget *w,
                   struct snd_kcontrol *kcontrol, int event)
 {
     struct snd_soc_dapm_path *path;
     struct snd_soc_dai *source, *sink;
     struct snd_pcm_substream *substream = w->priv;
     int ret = 0, saved_stream = substream->stream;
 
     if (WARN_ON(list_empty(&w->edges[SND_SOC_DAPM_DIR_OUT]) ||
             list_empty(&w->edges[SND_SOC_DAPM_DIR_IN])))
         return -EINVAL;
 
     switch (event) {
     case SND_SOC_DAPM_PRE_PMU:
         ret = snd_soc_dai_link_event_pre_pmu(w, substream);
         if (ret < 0)
             goto out;
 
         break;
 
     case SND_SOC_DAPM_POST_PMU:
         snd_soc_dapm_widget_for_each_sink_path(w, path) {
             sink = path->sink->priv;
 
             snd_soc_dai_digital_mute(sink, 0, SNDRV_PCM_STREAM_PLAYBACK);
             ret = 0;
         }
         break;
 
     case SND_SOC_DAPM_PRE_PMD:
         snd_soc_dapm_widget_for_each_sink_path(w, path) {
             sink = path->sink->priv;
 
             snd_soc_dai_digital_mute(sink, 1, SNDRV_PCM_STREAM_PLAYBACK);
             ret = 0;
         }
 
         substream->stream = SNDRV_PCM_STREAM_CAPTURE;
         snd_soc_dapm_widget_for_each_source_path(w, path) {
             source = path->source->priv;
             snd_soc_dai_hw_free(source, substream, 0);
         }
 
         substream->stream = SNDRV_PCM_STREAM_PLAYBACK;
         snd_soc_dapm_widget_for_each_sink_path(w, path) {
             sink = path->sink->priv;
             snd_soc_dai_hw_free(sink, substream, 0);
         }
 
         substream->stream = SNDRV_PCM_STREAM_CAPTURE;
         snd_soc_dapm_widget_for_each_source_path(w, path) {
             source = path->source->priv;
             snd_soc_dai_deactivate(source, substream->stream);
             snd_soc_dai_shutdown(source, substream, 0);
         }
 
         substream->stream = SNDRV_PCM_STREAM_PLAYBACK;
         snd_soc_dapm_widget_for_each_sink_path(w, path) {
             sink = path->sink->priv;
             snd_soc_dai_deactivate(sink, substream->stream);
             snd_soc_dai_shutdown(sink, substream, 0);
         }
         break;
 
     case SND_SOC_DAPM_POST_PMD:
         kfree(substream->runtime);
         break;
 
     default:
         WARN(1, "Unknown event %d\n", event);
         ret = -EINVAL;
     }
 
 out:
     /* Restore the substream direction */
     substream->stream = saved_stream;
     return ret;
 }
 
 static int snd_soc_dapm_dai_link_get(struct snd_kcontrol *kcontrol,
               struct snd_ctl_elem_value *ucontrol)
 {
     struct snd_soc_dapm_widget *w = snd_kcontrol_chip(kcontrol);
     struct snd_soc_pcm_runtime *rtd = w->priv;
 
     ucontrol->value.enumerated.item[0] = rtd->params_select;
 
     return 0;
 }
 
 static int snd_soc_dapm_dai_link_put(struct snd_kcontrol *kcontrol,
               struct snd_ctl_elem_value *ucontrol)
 {
     struct snd_soc_dapm_widget *w = snd_kcontrol_chip(kcontrol);
     struct snd_soc_pcm_runtime *rtd = w->priv;
 
     /* Can't change the config when widget is already powered */
     if (w->power)
         return -EBUSY;
 
     if (ucontrol->value.enumerated.item[0] == rtd->params_select)
         return 0;
 
     if (ucontrol->value.enumerated.item[0] >= rtd->dai_link->num_params)
         return -EINVAL;
 
     rtd->params_select = ucontrol->value.enumerated.item[0];
 
     return 1;
 }
 
 static void
 snd_soc_dapm_free_kcontrol(struct snd_soc_card *card,
             unsigned long *private_value,
             int num_params,
             const char **w_param_text)
 {
     int count;
 
     devm_kfree(card->dev, (void *)*private_value);
 
     if (!w_param_text)
         return;
 
     for (count = 0 ; count < num_params; count++)
         devm_kfree(card->dev, (void *)w_param_text[count]);
     devm_kfree(card->dev, w_param_text);
 }
 
 static struct snd_kcontrol_new *
 snd_soc_dapm_alloc_kcontrol(struct snd_soc_card *card,
             char *link_name,
             const struct snd_soc_pcm_stream *params,
             int num_params, const char **w_param_text,
             unsigned long *private_value)
 {
     struct soc_enum w_param_enum[] = {
         SOC_ENUM_SINGLE(0, 0, 0, NULL),
     };
     struct snd_kcontrol_new kcontrol_dai_link[] = {
         SOC_ENUM_EXT(NULL, w_param_enum[0],
                  snd_soc_dapm_dai_link_get,
                  snd_soc_dapm_dai_link_put),
     };
     struct snd_kcontrol_new *kcontrol_news;
     const struct snd_soc_pcm_stream *config = params;
     int count;
 
     for (count = 0 ; count < num_params; count++) {
         if (!config->stream_name) {
             dev_warn(card->dapm.dev,
                 "ASoC: anonymous config %d for dai link %s\n",
                 count, link_name);
             w_param_text[count] =
                 devm_kasprintf(card->dev, GFP_KERNEL,
                            "Anonymous Configuration %d",
                            count);
         } else {
             w_param_text[count] = devm_kmemdup(card->dev,
                         config->stream_name,
                         strlen(config->stream_name) + 1,
                         GFP_KERNEL);
         }
         if (!w_param_text[count])
             goto outfree_w_param;
         config++;
     }
 
     w_param_enum[0].items = num_params;
     w_param_enum[0].texts = w_param_text;
 
     *private_value =
         (unsigned long) devm_kmemdup(card->dev,
             (void *)(kcontrol_dai_link[0].private_value),
             sizeof(struct soc_enum), GFP_KERNEL);
     if (!*private_value) {
         dev_err(card->dev, "ASoC: Failed to create control for %s widget\n",
             link_name);
         goto outfree_w_param;
     }
     kcontrol_dai_link[0].private_value = *private_value;
     /* duplicate kcontrol_dai_link on heap so that memory persists */
     kcontrol_news = devm_kmemdup(card->dev, &kcontrol_dai_link[0],
                     sizeof(struct snd_kcontrol_new),
                     GFP_KERNEL);
     if (!kcontrol_news) {
         dev_err(card->dev, "ASoC: Failed to create control for %s widget\n",
             link_name);
         goto outfree_w_param;
     }
     return kcontrol_news;
 
 outfree_w_param:
     snd_soc_dapm_free_kcontrol(card, private_value, num_params, w_param_text);
     return NULL;
 }
 
 static struct snd_soc_dapm_widget *
 snd_soc_dapm_new_dai(struct snd_soc_card *card,
              struct snd_pcm_substream *substream,
              char *id)
 {
     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
     struct snd_soc_dapm_widget template;
     struct snd_soc_dapm_widget *w;
     const char **w_param_text;
     unsigned long private_value = 0;
     char *link_name;
     int ret;
 
     link_name = devm_kasprintf(card->dev, GFP_KERNEL, "%s-%s",
                    rtd->dai_link->name, id);
     if (!link_name)
         return ERR_PTR(-ENOMEM);
 
     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 | SND_SOC_DAPM_POST_PMD;
     template.kcontrol_news = NULL;
 
     /* allocate memory for control, only in case of multiple configs */
     if (rtd->dai_link->num_params > 1) {
         w_param_text = devm_kcalloc(card->dev,
                         rtd->dai_link->num_params,
                         sizeof(char *), GFP_KERNEL);
         if (!w_param_text) {
             ret = -ENOMEM;
             goto param_fail;
         }
 
         template.num_kcontrols = 1;
         template.kcontrol_news =
                     snd_soc_dapm_alloc_kcontrol(card,
                         link_name,
                         rtd->dai_link->params,
                         rtd->dai_link->num_params,
                         w_param_text, &private_value);
         if (!template.kcontrol_news) {
             ret = -ENOMEM;
             goto param_fail;
         }
     } else {
         w_param_text = NULL;
     }
     dev_dbg(card->dev, "ASoC: adding %s widget\n", link_name);
 
     w = snd_soc_dapm_new_control_unlocked(&card->dapm, &template);
     if (IS_ERR(w)) {
         ret = PTR_ERR(w);
         dev_err(rtd->dev, "ASoC: Failed to create %s widget: %d\n",
             link_name, ret);
         goto outfree_kcontrol_news;
     }
 
     w->priv = substream;
 
     return w;
 
 outfree_kcontrol_news:
     devm_kfree(card->dev, (void *)template.kcontrol_news);
     snd_soc_dapm_free_kcontrol(card, &private_value,
                    rtd->dai_link->num_params, w_param_text);
 param_fail:
     devm_kfree(card->dev, link_name);
     return ERR_PTR(ret);
 }
 
 /**
  * snd_soc_dapm_new_dai_widgets - Create new DAPM widgets
  * @dapm: DAPM context
  * @dai: parent DAI
  *
  * Returns 0 on success, error code otherwise.
  */
 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_unlocked(dapm, &template);
         if (IS_ERR(w))
             return PTR_ERR(w);
 
         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_unlocked(dapm, &template);
         if (IS_ERR(w))
             return PTR_ERR(w);
 
         w->priv = dai;
         dai->capture_widget = w;
     }
 
     return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_new_dai_widgets);
 
 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... */
     for_each_card_widgets(card, dai_w) {
         switch (dai_w->id) {
         case snd_soc_dapm_dai_in:
         case snd_soc_dapm_dai_out:
             break;
         default:
             continue;
         }
 
         /* let users know there is no DAI to link */
         if (!dai_w->priv) {
             dev_dbg(card->dev, "dai widget %s has no DAI\n",
                 dai_w->name);
             continue;
         }
 
         dai = dai_w->priv;
 
         /* ...find all widgets with the same stream and link them */
         for_each_card_widgets(card, w) {
             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->sname))
                 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;
 }
 
 static void dapm_connect_dai_routes(struct snd_soc_dapm_context *dapm,
                     struct snd_soc_dai *src_dai,
                     struct snd_soc_dapm_widget *src,
                     struct snd_soc_dapm_widget *dai,
                     struct snd_soc_dai *sink_dai,
                     struct snd_soc_dapm_widget *sink)
 {
     dev_dbg(dapm->dev, "connected DAI link %s:%s -> %s:%s\n",
         src_dai->component->name, src->name,
         sink_dai->component->name, sink->name);
 
     if (dai) {
         snd_soc_dapm_add_path(dapm, src, dai, NULL, NULL);
         src = dai;
     }
 
     snd_soc_dapm_add_path(dapm, src, sink, NULL, NULL);
 }
 
 static void dapm_connect_dai_pair(struct snd_soc_card *card,
                   struct snd_soc_pcm_runtime *rtd,
                   struct snd_soc_dai *codec_dai,
                   struct snd_soc_dai *cpu_dai)
 {
     struct snd_soc_dai_link *dai_link = rtd->dai_link;
     struct snd_soc_dapm_widget *dai, *codec, *playback_cpu, *capture_cpu;
     struct snd_pcm_substream *substream;
     struct snd_pcm_str *streams = rtd->pcm->streams;
 
     if (dai_link->params) {
         playback_cpu = cpu_dai->capture_widget;
         capture_cpu = cpu_dai->playback_widget;
     } else {
         playback_cpu = cpu_dai->playback_widget;
         capture_cpu = cpu_dai->capture_widget;
     }
 
     /* connect BE DAI playback if widgets are valid */
     codec = codec_dai->playback_widget;
 
     if (playback_cpu && codec) {
         if (dai_link->params && !rtd->playback_widget) {
             substream = streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
             dai = snd_soc_dapm_new_dai(card, substream, "playback");
             if (IS_ERR(dai))
                 goto capture;
             rtd->playback_widget = dai;
         }
 
         dapm_connect_dai_routes(&card->dapm, cpu_dai, playback_cpu,
                     rtd->playback_widget,
                     codec_dai, codec);
     }
 
 capture:
     /* connect BE DAI capture if widgets are valid */
     codec = codec_dai->capture_widget;
 
     if (codec && capture_cpu) {
         if (dai_link->params && !rtd->capture_widget) {
             substream = streams[SNDRV_PCM_STREAM_CAPTURE].substream;
             dai = snd_soc_dapm_new_dai(card, substream, "capture");
             if (IS_ERR(dai))
                 return;
             rtd->capture_widget = dai;
         }
 
         dapm_connect_dai_routes(&card->dapm, codec_dai, codec,
                     rtd->capture_widget,
                     cpu_dai, capture_cpu);
     }
 }
 
 static void soc_dapm_dai_stream_event(struct snd_soc_dai *dai, int stream,
     int event)
 {
     struct snd_soc_dapm_widget *w;
 
     w = snd_soc_dai_get_widget(dai, stream);
 
     if (w) {
         unsigned int ep;
 
         dapm_mark_dirty(w, "stream event");
 
         if (w->id == snd_soc_dapm_dai_in) {
             ep = SND_SOC_DAPM_EP_SOURCE;
             dapm_widget_invalidate_input_paths(w);
         } else {
             ep = SND_SOC_DAPM_EP_SINK;
             dapm_widget_invalidate_output_paths(w);
         }
 
         switch (event) {
         case SND_SOC_DAPM_STREAM_START:
             w->active = 1;
             w->is_ep = ep;
             break;
         case SND_SOC_DAPM_STREAM_STOP:
             w->active = 0;
             w->is_ep = 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;
         }
     }
 }
 
 void snd_soc_dapm_connect_dai_link_widgets(struct snd_soc_card *card)
 {
     struct snd_soc_pcm_runtime *rtd;
     struct snd_soc_dai *codec_dai;
     int i;
 
     /* for each BE DAI link... */
     for_each_card_rtds(card, rtd)  {
         /*
          * dynamic FE links have no fixed DAI mapping.
          * CODEC<->CODEC links have no direct connection.
          */
         if (rtd->dai_link->dynamic)
             continue;
 
         if (rtd->num_cpus == 1) {
             for_each_rtd_codec_dais(rtd, i, codec_dai)
                 dapm_connect_dai_pair(card, rtd, codec_dai,
                               asoc_rtd_to_cpu(rtd, 0));
         } else if (rtd->num_codecs == rtd->num_cpus) {
             for_each_rtd_codec_dais(rtd, i, codec_dai)
                 dapm_connect_dai_pair(card, rtd, codec_dai,
                               asoc_rtd_to_cpu(rtd, i));
         } else {
             dev_err(card->dev,
                 "N cpus to M codecs link is not supported yet\n");
         }
     }
 }
 
 static void soc_dapm_stream_event(struct snd_soc_pcm_runtime *rtd, int stream,
     int event)
 {
     struct snd_soc_dai *dai;
     int i;
 
     for_each_rtd_dais(rtd, i, dai)
         soc_dapm_dai_stream_event(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);
 }
 
 void snd_soc_dapm_stream_stop(struct snd_soc_pcm_runtime *rtd, int stream)
 {
     if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
         if (snd_soc_runtime_ignore_pmdown_time(rtd)) {
             /* powered down playback stream now */
             snd_soc_dapm_stream_event(rtd,
                           SNDRV_PCM_STREAM_PLAYBACK,
                           SND_SOC_DAPM_STREAM_STOP);
         } else {
             /* start delayed pop wq here for playback streams */
             rtd->pop_wait = 1;
             queue_delayed_work(system_power_efficient_wq,
                        &rtd->delayed_work,
                        msecs_to_jiffies(rtd->pmdown_time));
         }
     } else {
         /* capture streams can be powered down now */
         snd_soc_dapm_stream_event(rtd, SNDRV_PCM_STREAM_CAPTURE,
                       SND_SOC_DAPM_STREAM_STOP);
     }
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_stream_stop);
 
 /**
  * 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);
     if (!w->connected) {
         /*
          * w->force does not affect the number of input or output paths,
          * so we only have to recheck if w->connected is changed
          */
         dapm_widget_invalidate_input_paths(w);
         dapm_widget_invalidate_output_paths(w);
         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);
 
 /**
  * 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)
 {
     dapm_debugfs_cleanup(dapm);
     dapm_free_widgets(dapm);
     list_del(&dapm->list);
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_free);
 
 void snd_soc_dapm_init(struct snd_soc_dapm_context *dapm,
                struct snd_soc_card *card,
                struct snd_soc_component *component)
 {
     dapm->card      = card;
     dapm->component     = component;
     dapm->bias_level    = SND_SOC_BIAS_OFF;
 
     if (component) {
         dapm->dev       = component->dev;
         dapm->idle_bias_off = !component->driver->idle_bias_on;
         dapm->suspend_bias_off  = component->driver->suspend_bias_off;
     } else {
         dapm->dev       = card->dev;
     }
 
     INIT_LIST_HEAD(&dapm->list);
     /* see for_each_card_dapms */
     list_add(&dapm->list, &card->dapm_list);
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_init);
 
 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);
 
     for_each_card_widgets(dapm->card, w) {
         if (w->dapm != dapm)
             continue;
         if (w->power) {
             dapm_seq_insert(w, &down_list, false);
             w->new_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;
 
     for_each_card_dapms(card, dapm) {
         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");