powerpc/book3s64/mm: Simplify the rcu callback for page table free

[linux.git] / sound / soc / soc-dapm.c

/*
 * soc-dapm.c  --  ALSA SoC Dynamic Audio Power Management
 *
 * Copyright 2005 Wolfson Microelectronics PLC.
 * Author: Liam Girdwood <[email protected]>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 *  Features:
 *    o Changes power status of internal codec blocks depending on the
 *      dynamic configuration of codec internal audio paths and active
 *      DACs/ADCs.
 *    o Platform power domain - can support external components i.e. amps and
 *      mic/headphone insertion events.
 *    o Automatic Mic Bias support
 *    o Jack insertion power event initiation - e.g. hp insertion will enable
 *      sinks, dacs, etc
 *    o Delayed power down of audio subsystem to reduce pops between a quick
 *      device reopen.
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/async.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/bitops.h>
#include <linux/platform_device.h>
#include <linux/jiffies.h>
#include <linux/debugfs.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/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);

/* dapm power sequences - make this per codec in the future */
static int dapm_up_seq[] = {
        [snd_soc_dapm_pre] = 0,
        [snd_soc_dapm_regulator_supply] = 1,
        [snd_soc_dapm_pinctrl] = 1,
        [snd_soc_dapm_clock_supply] = 1,
        [snd_soc_dapm_supply] = 2,
        [snd_soc_dapm_micbias] = 3,
        [snd_soc_dapm_dai_link] = 2,
        [snd_soc_dapm_dai_in] = 4,
        [snd_soc_dapm_dai_out] = 4,
        [snd_soc_dapm_aif_in] = 4,
        [snd_soc_dapm_aif_out] = 4,
        [snd_soc_dapm_mic] = 5,
        [snd_soc_dapm_mux] = 6,
        [snd_soc_dapm_demux] = 6,
        [snd_soc_dapm_dac] = 7,
        [snd_soc_dapm_switch] = 8,
        [snd_soc_dapm_mixer] = 8,
        [snd_soc_dapm_mixer_named_ctl] = 8,
        [snd_soc_dapm_pga] = 9,
        [snd_soc_dapm_adc] = 10,
        [snd_soc_dapm_out_drv] = 11,
        [snd_soc_dapm_hp] = 11,
        [snd_soc_dapm_spk] = 11,
        [snd_soc_dapm_line] = 11,
        [snd_soc_dapm_kcontrol] = 12,
        [snd_soc_dapm_post] = 13,
};

static int dapm_down_seq[] = {
        [snd_soc_dapm_pre] = 0,
        [snd_soc_dapm_kcontrol] = 1,
        [snd_soc_dapm_adc] = 2,
        [snd_soc_dapm_hp] = 3,
        [snd_soc_dapm_spk] = 3,
        [snd_soc_dapm_line] = 3,
        [snd_soc_dapm_out_drv] = 3,
        [snd_soc_dapm_pga] = 4,
        [snd_soc_dapm_switch] = 5,
        [snd_soc_dapm_mixer_named_ctl] = 5,
        [snd_soc_dapm_mixer] = 5,
        [snd_soc_dapm_dac] = 6,
        [snd_soc_dapm_mic] = 7,
        [snd_soc_dapm_micbias] = 8,
        [snd_soc_dapm_mux] = 9,
        [snd_soc_dapm_demux] = 9,
        [snd_soc_dapm_aif_in] = 10,
        [snd_soc_dapm_aif_out] = 10,
        [snd_soc_dapm_dai_in] = 10,
        [snd_soc_dapm_dai_out] = 10,
        [snd_soc_dapm_dai_link] = 11,
        [snd_soc_dapm_supply] = 12,
        [snd_soc_dapm_clock_supply] = 13,
        [snd_soc_dapm_pinctrl] = 13,
        [snd_soc_dapm_regulator_supply] = 13,
        [snd_soc_dapm_post] = 14,
};

static void dapm_assert_locked(struct snd_soc_dapm_context *dapm)
{
        if (dapm->card && dapm->card->instantiated)
                lockdep_assert_held(&dapm->card->dapm_mutex);
}

static void pop_wait(u32 pop_time)
{
        if (pop_time)
                schedule_timeout_uninterruptible(msecs_to_jiffies(pop_time));
}

static void pop_dbg(struct device *dev, u32 pop_time, const char *fmt, ...)
{
        va_list args;
        char *buf;

        if (!pop_time)
                return;

        buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
        if (buf == NULL)
                return;

        va_start(args, fmt);
        vsnprintf(buf, PAGE_SIZE, fmt, args);
        dev_info(dev, "%s", buf);
        va_end(args);

        kfree(buf);
}

static bool dapm_dirty_widget(struct snd_soc_dapm_widget *w)
{
        return !list_empty(&w->dirty);
}

static void dapm_mark_dirty(struct snd_soc_dapm_widget *w, const char *reason)
{
        dapm_assert_locked(w->dapm);

        if (!dapm_dirty_widget(w)) {
                dev_vdbg(w->dapm->dev, "Marking %s dirty due to %s\n",
                         w->name, reason);
                list_add_tail(&w->dirty, &w->dapm->card->dapm_dirty);
        }
}

/*
 * 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);

        list_for_each_entry(w, &card->widgets, list) {
                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)
{
        return kmemdup(_widget, sizeof(*_widget), GFP_KERNEL);
}

struct dapm_kcontrol_data {
        unsigned int value;
        struct snd_soc_dapm_widget *widget;
        struct list_head paths;
        struct snd_soc_dapm_widget_list *wlist;
};

static int dapm_kcontrol_data_alloc(struct snd_soc_dapm_widget *widget,
        struct snd_kcontrol *kcontrol, 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 && snd_soc_volsw_is_stereo(mc))
                        dev_warn(widget->dapm->dev,
                                 "ASoC: Unsupported stereo autodisable control '%s'\n",
                                 ctrl_name);

                if (mc->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 = 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;
                        }
                        if (!data->widget) {
                                ret = -ENOMEM;
                                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 << e->shift_l;
                        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;
                        }
                        if (!data->widget) {
                                ret = -ENOMEM;
                                goto err_data;
                        }

                        snd_soc_dapm_add_path(widget->dapm, data->widget,
                                              widget, NULL, NULL);
                }
                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);
        kfree(data->wlist);
        kfree(data);
}

static struct snd_soc_dapm_widget_list *dapm_kcontrol_get_wlist(
        const struct snd_kcontrol *kcontrol)
{
        struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);

        return data->wlist;
}

static int dapm_kcontrol_add_widget(struct snd_kcontrol *kcontrol,
        struct snd_soc_dapm_widget *widget)
{
        struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);
        struct snd_soc_dapm_widget_list *new_wlist;
        unsigned int n;

        if (data->wlist)
                n = data->wlist->num_widgets + 1;
        else
                n = 1;

        new_wlist = krealloc(data->wlist,
                        sizeof(*new_wlist) + sizeof(widget) * n, GFP_KERNEL);
        if (!new_wlist)
                return -ENOMEM;

        new_wlist->widgets[n - 1] = widget;
        new_wlist->num_widgets = n;

        data->wlist = new_wlist;

        return 0;
}

static void dapm_kcontrol_add_path(const struct snd_kcontrol *kcontrol,
        struct snd_soc_dapm_path *path)
{
        struct dapm_kcontrol_data *data = snd_kcontrol_chip(kcontrol);

        list_add_tail(&path->list_kcontrol, &data->paths);
}

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)
                data->widget->on_val = value;

        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));

        list_for_each_entry(w, &card->widgets, list) {
                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 int soc_dapm_read(struct snd_soc_dapm_context *dapm, int reg,
        unsigned int *value)
{
        if (!dapm->component)
                return -EIO;
        return snd_soc_component_read(dapm->component, reg, value);
}

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;
        struct list_head *wlist;
        const int depth = 2;
        int i = 0;

        if (w) {
                wlist = &w->dapm->card->widgets;

                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->set_bias_level)
                ret = dapm->set_bias_level(dapm, 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);

        if (card && card->set_bias_level)
                ret = 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;

        if (card && card->set_bias_level_post)
                ret = card->set_bias_level_post(card, dapm, level);
out:
        trace_snd_soc_bias_level_done(card, level);

        return ret;
}

/* connect mux widget to its interconnecting audio paths */
static int dapm_connect_mux(struct snd_soc_dapm_context *dapm,
        struct snd_soc_dapm_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 val, item;
        int i;

        if (e->reg != SND_SOC_NOPM) {
                soc_dapm_read(dapm, e->reg, &val);
                val = (val >> e->shift_l) & e->mask;
                item = snd_soc_enum_val_to_item(e, val);
        } else {
                /* since a virtual mux has no backing registers to
                 * decide which path to connect, it will try to match
                 * with the first enumeration.  This is to ensure
                 * that the default mux choice (the first) will be
                 * correctly powered up during initialization.
                 */
                item = 0;
        }

        for (i = 0; i < e->items; i++) {
                if (!(strcmp(control_name, e->texts[i]))) {
                        path->name = e->texts[i];
                        if (i == item)
                                path->connect = 1;
                        else
                                path->connect = 0;
                        return 0;
                }
        }

        return -ENODEV;
}

/* set up initial codec paths */
static void dapm_set_mixer_path_status(struct snd_soc_dapm_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 shift = mc->shift;
        unsigned int max = mc->max;
        unsigned int mask = (1 << fls(max)) - 1;
        unsigned int invert = mc->invert;
        unsigned int val;

        if (reg != SND_SOC_NOPM) {
                soc_dapm_read(p->sink->dapm, reg, &val);
                /*
                 * 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)
                                soc_dapm_read(p->sink->dapm, mc->rreg, &val);
                        val = (val >> mc->rshift) & mask;
                } else {
                        val = (val >> shift) & mask;
                }
                if (invert)
                        val = max - val;
                p->connect = !!val;
        } else {
                p->connect = 0;
        }
}

/* connect mixer widget to its interconnecting audio paths */
static int dapm_connect_mixer(struct snd_soc_dapm_context *dapm,
        struct snd_soc_dapm_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;

        list_for_each_entry(w, &dapm->card->widgets, list) {
                if (w == kcontrolw || w->dapm != kcontrolw->dapm)
                        continue;
                for (i = 0; i < w->num_kcontrols; i++) {
                        if (&w->kcontrol_news[i] == kcontrol_new) {
                                if (w->kcontrols)
                                        *kcontrol = w->kcontrols[i];
                                return 1;
                        }
                }
        }

        return 0;
}

/*
 * Determine if a kcontrol is shared. If it is, look it up. If it isn't,
 * create it. Either way, add the widget into the control's widget list
 */
static int dapm_create_or_share_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_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, ret;

        for (i = 0; i < w->num_kcontrols; i++) {
                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, ret;
        struct snd_kcontrol *kcontrol;
        struct snd_soc_dapm_context *dapm = w->dapm;
        struct snd_card *card = dapm->card->snd_card;

        /* create control for links with > 1 config */
        if (w->num_params <= 1)
                return 0;

        /* add kcontrol */
        for (i = 0; i < w->num_kcontrols; i++) {
                kcontrol = snd_soc_cnew(&w->kcontrol_news[i], w,
                                        w->name, NULL);
                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 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(sizeof(**list) + size * sizeof(*w), 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;
}

/*
 * 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)) {
                widget->endpoints[dir] = 1;
                return widget->endpoints[dir];
        }

        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 the walk should be
 * stopped and false otherwise.
 */
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_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);

        /*
         * For is_connected_{output,input}_ep fully discover the graph we need
         * to reset the cached number of inputs and outputs.
         */
        list_for_each_entry(w, &card->widgets, list) {
                w->endpoints[SND_SOC_DAPM_DIR_IN] = -1;
                w->endpoints[SND_SOC_DAPM_DIR_OUT] = -1;
        }

        if (stream == SNDRV_PCM_STREAM_PLAYBACK)
                paths = is_connected_output_ep(dai->playback_widget, &widgets,
                                custom_stop_condition);
        else
                paths = is_connected_input_ep(dai->capture_widget, &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;
}

/*
 * 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);

#ifdef CONFIG_HAVE_CLK
        if (SND_SOC_DAPM_EVENT_ON(event)) {
                return clk_prepare_enable(w->clk);
        } else {
                clk_disable_unprepare(w->clk);
                return 0;
        }
#endif
        return 0;
}
EXPORT_SYMBOL_GPL(dapm_clock_event);

static int dapm_widget_power_check(struct snd_soc_dapm_widget *w)
{
        if (w->power_checked)
                return w->new_power;

        if (w->force)
                w->new_power = 1;
        else
                w->new_power = w->power_check(w);

        w->power_checked = true;

        return w->new_power;
}

/* Generic check to see if a widget should be powered. */
static int dapm_generic_check_power(struct snd_soc_dapm_widget *w)
{
        int in, out;

        DAPM_UPDATE_STAT(w, power_checks);

        in = is_connected_input_ep(w, NULL, 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;

        if (power_up)
                sort = dapm_up_seq;
        else
                sort = dapm_down_seq;

        if (sort[a->id] != sort[b->id])
                return sort[a->id] - sort[b->id];
        if (a->subseq != b->subseq) {
                if (power_up)
                        return a->subseq - b->subseq;
                else
                        return b->subseq - a->subseq;
        }
        if (a->reg != b->reg)
                return a->reg - b->reg;
        if (a->dapm != b->dapm)
                return (unsigned long)a->dapm - (unsigned long)b->dapm;

        return 0;
}

/* Insert a widget in order into a DAPM power sequence. */
static void dapm_seq_insert(struct snd_soc_dapm_widget *new_widget,
                            struct list_head *list,
                            bool power_up)
{
        struct snd_soc_dapm_widget *w;

        list_for_each_entry(w, list, power_list)
                if (dapm_seq_compare(new_widget, w, power_up) < 0) {
                        list_add_tail(&new_widget->power_list, &w->power_list);
                        return;
                }

        list_add_tail(&new_widget->power_list, list);
}

static void dapm_seq_check_event(struct snd_soc_card *card,
                                 struct snd_soc_dapm_widget *w, int event)
{
        const char *ev_name;
        int power, ret;

        switch (event) {
        case SND_SOC_DAPM_PRE_PMU:
                ev_name = "PRE_PMU";
                power = 1;
                break;
        case SND_SOC_DAPM_POST_PMU:
                ev_name = "POST_PMU";
                power = 1;
                break;
        case SND_SOC_DAPM_PRE_PMD:
                ev_name = "PRE_PMD";
                power = 0;
                break;
        case SND_SOC_DAPM_POST_PMD:
                ev_name = "POST_PMD";
                power = 0;
                break;
        case SND_SOC_DAPM_WILL_PMU:
                ev_name = "WILL_PMU";
                power = 1;
                break;
        case SND_SOC_DAPM_WILL_PMD:
                ev_name = "WILL_PMD";
                power = 0;
                break;
        default:
                WARN(1, "Unknown event %d\n", event);
                return;
        }

        if (w->new_power != power)
                return;

        if (w->event && (w->event_flags & event)) {
                pop_dbg(w->dapm->dev, card->pop_time, "pop test : %s %s\n",
                        w->name, ev_name);
                soc_dapm_async_complete(w->dapm);
                trace_snd_soc_dapm_widget_event_start(w, event);
                ret = w->event(w, NULL, event);
                trace_snd_soc_dapm_widget_event_done(w, event);
                if (ret < 0)
                        dev_err(w->dapm->dev, "ASoC: %s: %s event failed: %d\n",
                               ev_name, w->name, ret);
        }
}

/* Apply the coalesced changes from a DAPM sequence */
static void dapm_seq_run_coalesced(struct snd_soc_card *card,
                                   struct list_head *pending)
{
        struct snd_soc_dapm_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 ret, i;
        int *sort;

        if (power_up)
                sort = dapm_up_seq;
        else
                sort = dapm_down_seq;

        list_for_each_entry_safe(w, n, list, power_list) {
                ret = 0;

                /* Do we need to apply any queued changes? */
                if (sort[w->id] != cur_sort || w->reg != cur_reg ||
                    w->dapm != cur_dapm || w->subseq != cur_subseq) {
                        if (!list_empty(&pending))
                                dapm_seq_run_coalesced(card, &pending);

                        if (cur_dapm && cur_dapm->seq_notifier) {
                                for (i = 0; i < ARRAY_SIZE(dapm_up_seq); i++)
                                        if (sort[i] == cur_sort)
                                                cur_dapm->seq_notifier(cur_dapm,
                                                                       i,
                                                                       cur_subseq);
                        }

                        if (cur_dapm && w->dapm != cur_dapm)
                                soc_dapm_async_complete(cur_dapm);

                        INIT_LIST_HEAD(&pending);
                        cur_sort = -1;
                        cur_subseq = INT_MIN;
                        cur_reg = SND_SOC_NOPM;
                        cur_dapm = NULL;
                }

                switch (w->id) {
                case snd_soc_dapm_pre:
                        if (!w->event)
                                list_for_each_entry_safe_continue(w, n, list,
                                                                  power_list);

                        if (event == SND_SOC_DAPM_STREAM_START)
                                ret = w->event(w,
                                               NULL, SND_SOC_DAPM_PRE_PMU);
                        else if (event == SND_SOC_DAPM_STREAM_STOP)
                                ret = w->event(w,
                                               NULL, SND_SOC_DAPM_PRE_PMD);
                        break;

                case snd_soc_dapm_post:
                        if (!w->event)
                                list_for_each_entry_safe_continue(w, n, list,
                                                                  power_list);

                        if (event == SND_SOC_DAPM_STREAM_START)
                                ret = w->event(w,
                                               NULL, SND_SOC_DAPM_POST_PMU);
                        else if (event == SND_SOC_DAPM_STREAM_STOP)
                                ret = w->event(w,
                                               NULL, SND_SOC_DAPM_POST_PMD);
                        break;

                default:
                        /* Queue it up for application */
                        cur_sort = sort[w->id];
                        cur_subseq = w->subseq;
                        cur_reg = w->reg;
                        cur_dapm = w->dapm;
                        list_move(&w->power_list, &pending);
                        break;
                }

                if (ret < 0)
                        dev_err(w->dapm->dev,
                                "ASoC: Failed to apply widget power: %d\n", ret);
        }

        if (!list_empty(&pending))
                dapm_seq_run_coalesced(card, &pending);

        if (cur_dapm && cur_dapm->seq_notifier) {
                for (i = 0; i < ARRAY_SIZE(dapm_up_seq); i++)
                        if (sort[i] == cur_sort)
                                cur_dapm->seq_notifier(cur_dapm,
                                                       i, cur_subseq);
        }

        list_for_each_entry(d, &card->dapm_list, list) {
                soc_dapm_async_complete(d);
        }
}

static void dapm_widget_update(struct snd_soc_card *card)
{
        struct snd_soc_dapm_update *update = card->update;
        struct snd_soc_dapm_widget_list *wlist;
        struct snd_soc_dapm_widget *w = NULL;
        unsigned int wi;
        int ret;

        if (!update || !dapm_kcontrol_is_powered(update->kcontrol))
                return;

        wlist = dapm_kcontrol_get_wlist(update->kcontrol);

        for (wi = 0; wi < wlist->num_widgets; wi++) {
                w = wlist->widgets[wi];

                if (w->event && (w->event_flags & SND_SOC_DAPM_PRE_REG)) {
                        ret = w->event(w, update->kcontrol, SND_SOC_DAPM_PRE_REG);
                        if (ret != 0)
                                dev_err(w->dapm->dev, "ASoC: %s DAPM pre-event failed: %d\n",
                                           w->name, ret);
                }
        }

        if (!w)
                return;

        ret = soc_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 (wi = 0; wi < wlist->num_widgets; wi++) {
                w = wlist->widgets[wi];

                if (w->event && (w->event_flags & SND_SOC_DAPM_POST_REG)) {
                        ret = w->event(w, update->kcontrol, SND_SOC_DAPM_POST_REG);
                        if (ret != 0)
                                dev_err(w->dapm->dev, "ASoC: %s DAPM post-event failed: %d\n",
                                           w->name, ret);
                }
        }
}

/* Async callback run prior to DAPM sequences - brings to _PREPARE if
 * they're changing state.
 */
static void dapm_pre_sequence_async(void *data, async_cookie_t cookie)
{
        struct snd_soc_dapm_context *d = data;
        int ret;

        /* If we're off and we're not supposed to go into STANDBY */
        if (d->bias_level == SND_SOC_BIAS_OFF &&
            d->target_bias_level != SND_SOC_BIAS_OFF) {
                if (d->dev)
                        pm_runtime_get_sync(d->dev);

                ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_STANDBY);
                if (ret != 0)
                        dev_err(d->dev,
                                "ASoC: Failed to turn on bias: %d\n", ret);
        }

        /* Prepare for a transition to ON or away from ON */
        if ((d->target_bias_level == SND_SOC_BIAS_ON &&
             d->bias_level != SND_SOC_BIAS_ON) ||
            (d->target_bias_level != SND_SOC_BIAS_ON &&
             d->bias_level == SND_SOC_BIAS_ON)) {
                ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_PREPARE);
                if (ret != 0)
                        dev_err(d->dev,
                                "ASoC: Failed to prepare bias: %d\n", ret);
        }
}

/* Async callback run prior to DAPM sequences - brings to their final
 * state.
 */
static void dapm_post_sequence_async(void *data, async_cookie_t cookie)
{
        struct snd_soc_dapm_context *d = data;
        int ret;

        /* If we just powered the last thing off drop to standby bias */
        if (d->bias_level == SND_SOC_BIAS_PREPARE &&
            (d->target_bias_level == SND_SOC_BIAS_STANDBY ||
             d->target_bias_level == SND_SOC_BIAS_OFF)) {
                ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_STANDBY);
                if (ret != 0)
                        dev_err(d->dev, "ASoC: Failed to apply standby bias: %d\n",
                                ret);
        }

        /* If we're in standby and can support bias off then do that */
        if (d->bias_level == SND_SOC_BIAS_STANDBY &&
            d->target_bias_level == SND_SOC_BIAS_OFF) {
                ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_OFF);
                if (ret != 0)
                        dev_err(d->dev, "ASoC: Failed to turn off bias: %d\n",
                                ret);

                if (d->dev)
                        pm_runtime_put(d->dev);
        }

        /* If we just powered up then move to active bias */
        if (d->bias_level == SND_SOC_BIAS_PREPARE &&
            d->target_bias_level == SND_SOC_BIAS_ON) {
                ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_ON);
                if (ret != 0)
                        dev_err(d->dev, "ASoC: Failed to apply active bias: %d\n",
                                ret);
        }
}

static void dapm_widget_set_peer_power(struct snd_soc_dapm_widget *peer,
                                       bool power, bool connect)
{
        /* If a connection is being made or broken then that update
         * will have marked the peer dirty, otherwise the widgets are
         * not connected and this update has no impact. */
        if (!connect)
                return;

        /* If the peer is already in the state we're moving to then we
         * won't have an impact on it. */
        if (power != peer->power)
                dapm_mark_dirty(peer, "peer state change");
}

static void dapm_widget_set_power(struct snd_soc_dapm_widget *w, bool power,
                                  struct list_head *up_list,
                                  struct list_head *down_list)
{
        struct snd_soc_dapm_path *path;

        if (w->power == power)
                return;

        trace_snd_soc_dapm_widget_power(w, power);

        /* If we changed our power state perhaps our neigbours changed
         * also.
         */
        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;

        lockdep_assert_held(&card->dapm_mutex);

        trace_snd_soc_dapm_start(card);

        list_for_each_entry(d, &card->dapm_list, list) {
                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);
        }

        list_for_each_entry(w, &card->widgets, list) {
                switch (w->id) {
                case snd_soc_dapm_pre:
                case snd_soc_dapm_post:
                        /* These widgets always need to be powered */
                        break;
                default:
                        list_del_init(&w->dirty);
                        break;
                }

                if (w->new_power) {
                        d = w->dapm;

                        /* Supplies and micbiases only bring the
                         * context up to STANDBY as unless something
                         * else is active and passing audio they
                         * generally don't require full power.  Signal
                         * generators are virtual pins and have no
                         * power impact themselves.
                         */
                        switch (w->id) {
                        case snd_soc_dapm_siggen:
                        case snd_soc_dapm_vmid:
                                break;
                        case snd_soc_dapm_supply:
                        case snd_soc_dapm_regulator_supply:
                        case snd_soc_dapm_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;
        list_for_each_entry(d, &card->dapm_list, list)
                if (d->target_bias_level > bias)
                        bias = d->target_bias_level;
        list_for_each_entry(d, &card->dapm_list, list)
                if (!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 */
        list_for_each_entry(d, &card->dapm_list, list) {
                if (d != &card->dapm)
                        async_schedule_domain(dapm_pre_sequence_async, d,
                                                &async_domain);
        }
        async_synchronize_full_domain(&async_domain);

        list_for_each_entry(w, &down_list, power_list) {
                dapm_seq_check_event(card, w, SND_SOC_DAPM_WILL_PMD);
        }

        list_for_each_entry(w, &up_list, power_list) {
                dapm_seq_check_event(card, w, SND_SOC_DAPM_WILL_PMU);
        }

        /* Power down widgets first; try to avoid amplifying pops. */
        dapm_seq_run(card, &down_list, event, false);

        dapm_widget_update(card);

        /* Now power up. */
        dapm_seq_run(card, &up_list, event, true);

        /* Run all the bias changes in parallel */
        list_for_each_entry(d, &card->dapm_list, list) {
                if (d != &card->dapm)
                        async_schedule_domain(dapm_post_sequence_async, d,
                                                &async_domain);
        }
        async_synchronize_full_domain(&async_domain);
        /* Run card bias changes at last */
        dapm_post_sequence_async(&card->dapm, 0);

        /* do we need to notify any clients that DAPM event is complete */
        list_for_each_entry(d, &card->dapm_list, list) {
                if (d->stream_event)
                        d->stream_event(d, event);
        }

        pop_dbg(card->dev, card->pop_time,
                "DAPM sequencing finished, waiting %dms\n", card->pop_time);
        pop_wait(card->pop_time);

        trace_snd_soc_dapm_done(card);

        return 0;
}

#ifdef CONFIG_DEBUG_FS
static ssize_t dapm_widget_power_read_file(struct file *file,
                                           char __user *user_buf,
                                           size_t count, loff_t *ppos)
{
        struct snd_soc_dapm_widget *w = file->private_data;
        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 = snprintf(buf, PAGE_SIZE, "%s: %s%s  in %d out %d",
                       w->name, w->power ? "On" : "Off",
                       w->force ? " (forced)" : "", in, out);

        if (w->reg >= 0)
                ret += snprintf(buf + ret, PAGE_SIZE - ret,
                                " - R%d(0x%x) mask 0x%x",
                                w->reg, w->reg, w->mask << w->shift);

        ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");

        if (w->sname)
                ret += snprintf(buf + ret, PAGE_SIZE - ret, " stream %s %s\n",
                                w->sname,
                                w->active ? "active" : "inactive");

        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 += snprintf(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)
{
        struct dentry *d;

        if (!parent)
                return;

        dapm->debugfs_dapm = debugfs_create_dir("dapm", parent);

        if (!dapm->debugfs_dapm) {
                dev_warn(dapm->dev,
                       "ASoC: Failed to create DAPM debugfs directory\n");
                return;
        }

        d = debugfs_create_file("bias_level", 0444,
                                dapm->debugfs_dapm, dapm,
                                &dapm_bias_fops);
        if (!d)
                dev_warn(dapm->dev,
                         "ASoC: Failed to create bias level debugfs file\n");
}

static void dapm_debugfs_add_widget(struct snd_soc_dapm_widget *w)
{
        struct snd_soc_dapm_context *dapm = w->dapm;
        struct dentry *d;

        if (!dapm->debugfs_dapm || !w->name)
                return;

        d = debugfs_create_file(w->name, 0444,
                                dapm->debugfs_dapm, w,
                                &dapm_widget_power_fops);
        if (!d)
                dev_warn(w->dapm->dev,
                        "ASoC: Failed to create %s debugfs file\n",
                        w->name);
}

static void dapm_debugfs_cleanup(struct snd_soc_dapm_context *dapm)
{
        debugfs_remove_recursive(dapm->debugfs_dapm);
}

#else
void snd_soc_dapm_debugfs_init(struct snd_soc_dapm_context *dapm,
        struct dentry *parent)
{
}

static inline void dapm_debugfs_add_widget(struct snd_soc_dapm_widget *w)
{
}

static inline void dapm_debugfs_cleanup(struct snd_soc_dapm_context *dapm)
{
}

#endif

/*
 * 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 (!(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)
                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)
                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;

        list_for_each_entry(w, &cmpnt->card->widgets, list) {
                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_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);
        int i, count = 0;

        mutex_lock(&rtd->card->dapm_mutex);

        for (i = 0; i < rtd->num_codecs; i++) {
                struct snd_soc_component *cmpnt = rtd->codec_dais[i]->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);
}

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);
        /*
         * 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(w);
}

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;

        list_for_each_entry_safe(w, next_w, &dapm->card->widgets, list) {
                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;

        list_for_each_entry(w, &dapm->card->widgets, list) {
                if (!strcmp(w->name, pin)) {
                        if (w->dapm == dapm)
                                return w;
                        else
                                fallback = w;
                }
        }

        if (search_other_contexts)
                return fallback;

        return NULL;
}

static int snd_soc_dapm_set_pin(struct snd_soc_dapm_context *dapm,
                                const char *pin, int status)
{
        struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);

        dapm_assert_locked(dapm);

        if (!w) {
                dev_err(dapm->dev, "ASoC: DAPM unknown pin %s\n", pin);
                return -EINVAL;
        }

        if (w->connected != status) {
                dapm_mark_dirty(w, "pin configuration");
                dapm_widget_invalidate_input_paths(w);
                dapm_widget_invalidate_output_paths(w);
        }

        w->connected = status;
        if (status == 0)
                w->force = 0;

        return 0;
}

/**
 * snd_soc_dapm_sync_unlocked - scan and power dapm paths
 * @dapm: DAPM context
 *
 * Walks all dapm audio paths and powers widgets according to their
 * stream or path usage.
 *
 * Requires external locking.
 *
 * Returns 0 for success.
 */
int snd_soc_dapm_sync_unlocked(struct snd_soc_dapm_context *dapm)
{
        /*
         * Suppress early reports (eg, jacks syncing their state) to avoid
         * silly DAPM runs during card startup.
         */
        if (!dapm->card || !dapm->card->instantiated)
                return 0;

        return dapm_power_widgets(dapm->card, SND_SOC_DAPM_STREAM_NOP);
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_sync_unlocked);

/**
 * snd_soc_dapm_sync - scan and power dapm paths
 * @dapm: DAPM context
 *
 * Walks all dapm audio paths and powers widgets according to their
 * stream or path usage.
 *
 * Returns 0 for success.
 */
int snd_soc_dapm_sync(struct snd_soc_dapm_context *dapm)
{
        int ret;

        mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
        ret = snd_soc_dapm_sync_unlocked(dapm);
        mutex_unlock(&dapm->card->dapm_mutex);
        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_sync);

/*
 * 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;
        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
         */
        list_for_each_entry(w, &dapm->card->widgets, list) {
                if (!wsink && !(strcmp(w->name, sink))) {
                        wtsink = w;
                        if (w->dapm == dapm) {
                                wsink = w;
                                if (wsource)
                                        break;
                        }
                        continue;
                }
                if (!wsource && !(strcmp(w->name, source))) {
                        wtsource = w;
                        if (w->dapm == dapm) {
                                wsource = w;
                                if (wsink)
                                        break;
                        }
                }
        }
        /* 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_widget *wsource, *wsink;
        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) {
                wsource = path->source;
                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, r, ret = 0;

        mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
        for (i = 0; i < num; i++) {
                r = snd_soc_dapm_add_route(dapm, route);
                if (r < 0) {
                        dev_err(dapm->dev, "ASoC: Failed to add route %s -> %s -> %s\n",
                                route->source,
                                route->control ? route->control : "direct",
                                route->sink);
                        ret = r;
                }
                route++;
        }
        mutex_unlock(&dapm->card->dapm_mutex);

        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_add_routes);

/**
 * snd_soc_dapm_del_routes - Remove routes between DAPM widgets
 * @dapm: DAPM context
 * @route: audio routes
 * @num: number of routes
 *
 * Removes routes from the DAPM context.
 */
int snd_soc_dapm_del_routes(struct snd_soc_dapm_context *dapm,
                            const struct snd_soc_dapm_route *route, int num)
{
        int i;

        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, err;
        int ret = 0;

        mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
        for (i = 0; i < num; i++) {
                err = snd_soc_dapm_weak_route(dapm, route);
                if (err)
                        ret = err;
                route++;
        }
        mutex_unlock(&dapm->card->dapm_mutex);

        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_weak_routes);

/**
 * snd_soc_dapm_new_widgets - add new dapm widgets
 * @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);

        list_for_each_entry(w, &card->widgets, list)
        {
                if (w->new)
                        continue;

                if (w->num_kcontrols) {
                        w->kcontrols = kzalloc(w->num_kcontrols *
                                                sizeof(struct snd_kcontrol *),
                                                GFP_KERNEL);
                        if (!w->kcontrols) {
                                mutex_unlock(&card->dapm_mutex);
                                return -ENOMEM;
                        }
                }

                switch(w->id) {
                case snd_soc_dapm_switch:
                case snd_soc_dapm_mixer:
                case snd_soc_dapm_mixer_named_ctl:
                        dapm_new_mixer(w);
                        break;
                case snd_soc_dapm_mux:
                case snd_soc_dapm_demux:
                        dapm_new_mux(w);
                        break;
                case snd_soc_dapm_pga:
                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) {
                        soc_dapm_read(w->dapm, w->reg, &val);
                        val = val >> w->shift;
                        val &= w->mask;
                        if (val == w->on_val)
                                w->power = 1;
                }

                w->new = 1;

                dapm_mark_dirty(w, "new widget");
                dapm_debugfs_add_widget(w);
        }

        dapm_power_widgets(card, SND_SOC_DAPM_STREAM_NOP);
        mutex_unlock(&card->dapm_mutex);
        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_new_widgets);

/**
 * snd_soc_dapm_get_volsw - dapm mixer get callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to get the value of a dapm mixer control.
 *
 * Returns 0 for success.
 */
int snd_soc_dapm_get_volsw(struct snd_kcontrol *kcontrol,
        struct snd_ctl_elem_value *ucontrol)
{
        struct snd_soc_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;
        int ret = 0;

        mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
        if (dapm_kcontrol_is_powered(kcontrol) && reg != SND_SOC_NOPM) {
                ret = soc_dapm_read(dapm, reg, &reg_val);
                val = (reg_val >> shift) & mask;

                if (ret == 0 && reg != mc->rreg)
                        ret = soc_dapm_read(dapm, mc->rreg, &reg_val);

                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 (ret)
                return ret;

        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 ret;
}
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;
                }
                change |= reg_change;

                ret = soc_dapm_mixer_update_power(card, kcontrol, connect,
                                                  rconnect);

                card->update = NULL;
        }

        mutex_unlock(&card->dapm_mutex);

        if (ret > 0)
                soc_dpcm_runtime_update(card);

        return change;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_put_volsw);

/**
 * snd_soc_dapm_get_enum_double - dapm enumerated double mixer get callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to get the value of a dapm enumerated double mixer control.
 *
 * Returns 0 for success.
 */
int snd_soc_dapm_get_enum_double(struct snd_kcontrol *kcontrol,
        struct snd_ctl_elem_value *ucontrol)
{
        struct snd_soc_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)) {
                int ret = soc_dapm_read(dapm, e->reg, &reg_val);
                if (ret) {
                        mutex_unlock(&card->dapm_mutex);
                        return ret;
                }
        } 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;
                }
                change |= reg_change;

                ret = soc_dapm_mux_update_power(card, kcontrol, item[0], e);

                card->update = NULL;
        }

        mutex_unlock(&card->dapm_mutex);

        if (ret > 0)
                soc_dpcm_runtime_update(card);

        return change;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_put_enum_double);

/**
 * snd_soc_dapm_info_pin_switch - Info for a pin switch
 *
 * @kcontrol: mixer control
 * @uinfo: control element information
 *
 * Callback to provide information about a pin switch control.
 */
int snd_soc_dapm_info_pin_switch(struct snd_kcontrol *kcontrol,
                                 struct snd_ctl_elem_info *uinfo)
{
        uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
        uinfo->count = 1;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = 1;

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_info_pin_switch);

/**
 * snd_soc_dapm_get_pin_switch - Get information for a pin switch
 *
 * @kcontrol: mixer control
 * @ucontrol: Value
 */
int snd_soc_dapm_get_pin_switch(struct snd_kcontrol *kcontrol,
                                struct snd_ctl_elem_value *ucontrol)
{
        struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
        const char *pin = (const char *)kcontrol->private_value;

        mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);

        ucontrol->value.integer.value[0] =
                snd_soc_dapm_get_pin_status(&card->dapm, pin);

        mutex_unlock(&card->dapm_mutex);

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_get_pin_switch);

/**
 * snd_soc_dapm_put_pin_switch - Set information for a pin switch
 *
 * @kcontrol: mixer control
 * @ucontrol: Value
 */
int snd_soc_dapm_put_pin_switch(struct snd_kcontrol *kcontrol,
                                struct snd_ctl_elem_value *ucontrol)
{
        struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
        const char *pin = (const char *)kcontrol->private_value;

        if (ucontrol->value.integer.value[0])
                snd_soc_dapm_enable_pin(&card->dapm, pin);
        else
                snd_soc_dapm_disable_pin(&card->dapm, pin);

        snd_soc_dapm_sync(&card->dapm);
        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_put_pin_switch);

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);
        /* Do not nag about probe deferrals */
        if (IS_ERR(w)) {
                int ret = PTR_ERR(w);

                if (ret != -EPROBE_DEFER)
                        dev_err(dapm->dev,
                                "ASoC: Failed to create DAPM control %s (%d)\n",
                                widget->name, ret);
                goto out_unlock;
        }
        if (!w)
                dev_err(dapm->dev,
                        "ASoC: Failed to create DAPM control %s\n",
                        widget->name);

out_unlock:
        mutex_unlock(&dapm->card->dapm_mutex);
        return w;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_new_control);

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 NULL;

        switch (w->id) {
        case snd_soc_dapm_regulator_supply:
                w->regulator = devm_regulator_get(dapm->dev, w->name);
                if (IS_ERR(w->regulator)) {
                        ret = PTR_ERR(w->regulator);
                        if (ret == -EPROBE_DEFER)
                                return ERR_PTR(ret);
                        dev_err(dapm->dev, "ASoC: Failed to request %s: %d\n",
                                w->name, ret);
                        return NULL;
                }

                if (w->on_val & SND_SOC_DAPM_REGULATOR_BYPASS) {
                        ret = regulator_allow_bypass(w->regulator, true);
                        if (ret != 0)
                                dev_warn(w->dapm->dev,
                                         "ASoC: Failed to bypass %s: %d\n",
                                         w->name, ret);
                }
                break;
        case snd_soc_dapm_pinctrl:
                w->pinctrl = devm_pinctrl_get(dapm->dev);
                if (IS_ERR_OR_NULL(w->pinctrl)) {
                        ret = PTR_ERR(w->pinctrl);
                        if (ret == -EPROBE_DEFER)
                                return ERR_PTR(ret);
                        dev_err(dapm->dev, "ASoC: Failed to request %s: %d\n",
                                w->name, ret);
                        return NULL;
                }
                break;
        case snd_soc_dapm_clock_supply:
#ifdef CONFIG_CLKDEV_LOOKUP
                w->clk = devm_clk_get(dapm->dev, w->name);
                if (IS_ERR(w->clk)) {
                        ret = PTR_ERR(w->clk);
                        if (ret == -EPROBE_DEFER)
                                return ERR_PTR(ret);
                        dev_err(dapm->dev, "ASoC: Failed to request %s: %d\n",
                                w->name, ret);
                        return NULL;
                }
#else
                return NULL;
#endif
                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(w);
                return NULL;
        }

        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_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);
        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;
}

/**
 * snd_soc_dapm_new_controls - create new dapm controls
 * @dapm: DAPM context
 * @widget: widget array
 * @num: number of widgets
 *
 * Creates new DAPM controls based upon the templates.
 *
 * Returns 0 for success else error.
 */
int snd_soc_dapm_new_controls(struct snd_soc_dapm_context *dapm,
        const struct snd_soc_dapm_widget *widget,
        int num)
{
        struct snd_soc_dapm_widget *w;
        int i;
        int ret = 0;

        mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
        for (i = 0; i < num; i++) {
                w = snd_soc_dapm_new_control_unlocked(dapm, widget);
                if (IS_ERR(w)) {
                        ret = PTR_ERR(w);
                        /* Do not nag about probe deferrals */
                        if (ret == -EPROBE_DEFER)
                                break;
                        dev_err(dapm->dev,
                                "ASoC: Failed to create DAPM control %s (%d)\n",
                                widget->name, ret);
                        break;
                }
                if (!w) {
                        dev_err(dapm->dev,
                                "ASoC: Failed to create DAPM control %s\n",
                                widget->name);
                        ret = -ENOMEM;
                        break;
                }
                widget++;
        }
        mutex_unlock(&dapm->card->dapm_mutex);
        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_new_controls);

static int snd_soc_dai_link_event(struct snd_soc_dapm_widget *w,
                                  struct snd_kcontrol *kcontrol, int event)
{
        struct snd_soc_dapm_path *source_p, *sink_p;
        struct snd_soc_dai *source, *sink;
        const struct snd_soc_pcm_stream *config = w->params + w->params_select;
        struct snd_pcm_substream substream;
        struct snd_pcm_hw_params *params = NULL;
        struct snd_pcm_runtime *runtime = NULL;
        u64 fmt;
        int ret;

        if (WARN_ON(!config) ||
            WARN_ON(list_empty(&w->edges[SND_SOC_DAPM_DIR_OUT]) ||
                    list_empty(&w->edges[SND_SOC_DAPM_DIR_IN])))
                return -EINVAL;

        /* We only support a single source and sink, pick the first */
        source_p = list_first_entry(&w->edges[SND_SOC_DAPM_DIR_OUT],
                                    struct snd_soc_dapm_path,
                                    list_node[SND_SOC_DAPM_DIR_OUT]);
        sink_p = list_first_entry(&w->edges[SND_SOC_DAPM_DIR_IN],
                                    struct snd_soc_dapm_path,
                                    list_node[SND_SOC_DAPM_DIR_IN]);

        source = source_p->source->priv;
        sink = sink_p->sink->priv;

        /* Be a little careful as we don't want to overflow the mask array */
        if (config->formats) {
                fmt = ffs(config->formats) - 1;
        } else {
                dev_warn(w->dapm->dev, "ASoC: Invalid format %llx specified\n",
                         config->formats);
                fmt = 0;
        }

        /* Currently very limited parameter selection */
        params = kzalloc(sizeof(*params), GFP_KERNEL);
        if (!params) {
                ret = -ENOMEM;
                goto out;
        }
        snd_mask_set(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), fmt);

        hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE)->min =
                config->rate_min;
        hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE)->max =
                config->rate_max;

        hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS)->min
                = config->channels_min;
        hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS)->max
                = config->channels_max;

        memset(&substream, 0, sizeof(substream));

        /* Allocate a dummy snd_pcm_runtime for startup() and other ops() */
        runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
        if (!runtime) {
                ret = -ENOMEM;
                goto out;
        }
        substream.runtime = runtime;

        switch (event) {
        case SND_SOC_DAPM_PRE_PMU:
                substream.stream = SNDRV_PCM_STREAM_CAPTURE;
                if (source->driver->ops->startup) {
                        ret = source->driver->ops->startup(&substream, source);
                        if (ret < 0) {
                                dev_err(source->dev,
                                        "ASoC: startup() failed: %d\n", ret);
                                goto out;
                        }
                        source->active++;
                }
                ret = soc_dai_hw_params(&substream, params, source);
                if (ret < 0)
                        goto out;

                substream.stream = SNDRV_PCM_STREAM_PLAYBACK;
                if (sink->driver->ops->startup) {
                        ret = sink->driver->ops->startup(&substream, sink);
                        if (ret < 0) {
                                dev_err(sink->dev,
                                        "ASoC: startup() failed: %d\n", ret);
                                goto out;
                        }
                        sink->active++;
                }
                ret = soc_dai_hw_params(&substream, params, sink);
                if (ret < 0)
                        goto out;
                break;

        case SND_SOC_DAPM_POST_PMU:
                ret = snd_soc_dai_digital_mute(sink, 0,
                                               SNDRV_PCM_STREAM_PLAYBACK);
                if (ret != 0 && ret != -ENOTSUPP)
                        dev_warn(sink->dev, "ASoC: Failed to unmute: %d\n", ret);
                ret = 0;
                break;

        case SND_SOC_DAPM_PRE_PMD:
                ret = snd_soc_dai_digital_mute(sink, 1,
                                               SNDRV_PCM_STREAM_PLAYBACK);
                if (ret != 0 && ret != -ENOTSUPP)
                        dev_warn(sink->dev, "ASoC: Failed to mute: %d\n", ret);
                ret = 0;

                source->active--;
                if (source->driver->ops->shutdown) {
                        substream.stream = SNDRV_PCM_STREAM_CAPTURE;
                        source->driver->ops->shutdown(&substream, source);
                }

                sink->active--;
                if (sink->driver->ops->shutdown) {
                        substream.stream = SNDRV_PCM_STREAM_PLAYBACK;
                        sink->driver->ops->shutdown(&substream, sink);
                }
                break;

        default:
                WARN(1, "Unknown event %d\n", event);
                ret = -EINVAL;
        }

out:
        kfree(runtime);
        kfree(params);
        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);

        ucontrol->value.enumerated.item[0] = w->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);

        /* Can't change the config when widget is already powered */
        if (w->power)
                return -EBUSY;

        if (ucontrol->value.enumerated.item[0] == w->params_select)
                return 0;

        if (ucontrol->value.enumerated.item[0] >= w->num_params)
                return -EINVAL;

        w->params_select = ucontrol->value.enumerated.item[0];

        return 0;
}

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);
        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;
}

int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
                         const struct snd_soc_pcm_stream *params,
                         unsigned int num_params,
                         struct snd_soc_dapm_widget *source,
                         struct snd_soc_dapm_widget *sink)
{
        struct snd_soc_dapm_widget template;
        struct snd_soc_dapm_widget *w;
        const char **w_param_text;
        unsigned long private_value;
        char *link_name;
        int ret;

        link_name = devm_kasprintf(card->dev, GFP_KERNEL, "%s-%s",
                                   source->name, sink->name);
        if (!link_name)
                return -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;
        template.kcontrol_news = NULL;

        /* allocate memory for control, only in case of multiple configs */
        if (num_params > 1) {
                w_param_text = devm_kcalloc(card->dev, 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, params, 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);
                /* Do not nag about probe deferrals */
                if (ret != -EPROBE_DEFER)
                        dev_err(card->dev,
                                "ASoC: Failed to create %s widget (%d)\n",
                                link_name, ret);
                goto outfree_kcontrol_news;
        }
        if (!w) {
                dev_err(card->dev, "ASoC: Failed to create %s widget\n",
                        link_name);
                ret = -ENOMEM;
                goto outfree_kcontrol_news;
        }

        w->params = params;
        w->num_params = num_params;

        ret = snd_soc_dapm_add_path(&card->dapm, source, w, NULL, NULL);
        if (ret)
                goto outfree_w;
        return snd_soc_dapm_add_path(&card->dapm, w, sink, NULL, NULL);

outfree_w:
        devm_kfree(card->dev, w);
outfree_kcontrol_news:
        devm_kfree(card->dev, (void *)template.kcontrol_news);
        snd_soc_dapm_free_kcontrol(card, &private_value, num_params, w_param_text);
param_fail:
        devm_kfree(card->dev, link_name);
        return ret;
}

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)) {
                        int ret = PTR_ERR(w);

                        /* Do not nag about probe deferrals */
                        if (ret != -EPROBE_DEFER)
                                dev_err(dapm->dev,
                                "ASoC: Failed to create %s widget (%d)\n",
                                dai->driver->playback.stream_name, ret);
                        return ret;
                }
                if (!w) {
                        dev_err(dapm->dev, "ASoC: Failed to create %s widget\n",
                                dai->driver->playback.stream_name);
                        return -ENOMEM;
                }

                w->priv = dai;
                dai->playback_widget = w;
        }

        if (dai->driver->capture.stream_name) {
                template.id = snd_soc_dapm_dai_out;
                template.name = dai->driver->capture.stream_name;
                template.sname = dai->driver->capture.stream_name;

                dev_dbg(dai->dev, "ASoC: adding %s widget\n",
                        template.name);

                w = snd_soc_dapm_new_control_unlocked(dapm, &template);
                if (IS_ERR(w)) {
                        int ret = PTR_ERR(w);

                        /* Do not nag about probe deferrals */
                        if (ret != -EPROBE_DEFER)
                                dev_err(dapm->dev,
                                "ASoC: Failed to create %s widget (%d)\n",
                                dai->driver->playback.stream_name, ret);
                        return ret;
                }
                if (!w) {
                        dev_err(dapm->dev, "ASoC: Failed to create %s widget\n",
                                dai->driver->capture.stream_name);
                        return -ENOMEM;
                }

                w->priv = dai;
                dai->capture_widget = w;
        }

        return 0;
}

int snd_soc_dapm_link_dai_widgets(struct snd_soc_card *card)
{
        struct snd_soc_dapm_widget *dai_w, *w;
        struct snd_soc_dapm_widget *src, *sink;
        struct snd_soc_dai *dai;

        /* For each DAI widget... */
        list_for_each_entry(dai_w, &card->widgets, list) {
                switch (dai_w->id) {
                case snd_soc_dapm_dai_in:
                case snd_soc_dapm_dai_out:
                        break;
                default:
                        continue;
                }

                dai = dai_w->priv;

                /* ...find all widgets with the same stream and link them */
                list_for_each_entry(w, &card->widgets, list) {
                        if (w->dapm != dai_w->dapm)
                                continue;

                        switch (w->id) {
                        case snd_soc_dapm_dai_in:
                        case snd_soc_dapm_dai_out:
                                continue;
                        default:
                                break;
                        }

                        if (!w->sname || !strstr(w->sname, dai_w->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_link_widgets(struct snd_soc_card *card,
                                          struct snd_soc_pcm_runtime *rtd)
{
        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
        struct snd_soc_dapm_widget *sink, *source;
        int i;

        for (i = 0; i < rtd->num_codecs; i++) {
                struct snd_soc_dai *codec_dai = rtd->codec_dais[i];

                /* connect BE DAI playback if widgets are valid */
                if (codec_dai->playback_widget && cpu_dai->playback_widget) {
                        source = cpu_dai->playback_widget;
                        sink = codec_dai->playback_widget;
                        dev_dbg(rtd->dev, "connected DAI link %s:%s -> %s:%s\n",
                                cpu_dai->component->name, source->name,
                                codec_dai->component->name, sink->name);

                        snd_soc_dapm_add_path(&card->dapm, source, sink,
                                NULL, NULL);
                }

                /* connect BE DAI capture if widgets are valid */
                if (codec_dai->capture_widget && cpu_dai->capture_widget) {
                        source = codec_dai->capture_widget;
                        sink = cpu_dai->capture_widget;
                        dev_dbg(rtd->dev, "connected DAI link %s:%s -> %s:%s\n",
                                codec_dai->component->name, source->name,
                                cpu_dai->component->name, sink->name);

                        snd_soc_dapm_add_path(&card->dapm, source, sink,
                                NULL, NULL);
                }
        }
}

static void soc_dapm_dai_stream_event(struct snd_soc_dai *dai, int stream,
        int event)
{
        struct snd_soc_dapm_widget *w;
        unsigned int ep;

        if (stream == SNDRV_PCM_STREAM_PLAYBACK)
                w = dai->playback_widget;
        else
                w = dai->capture_widget;

        if (w) {
                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;

        /* for each BE DAI link... */
        list_for_each_entry(rtd, &card->rtd_list, list)  {
                /*
                 * dynamic FE links have no fixed DAI mapping.
                 * CODEC<->CODEC links have no direct connection.
                 */
                if (rtd->dai_link->dynamic || rtd->dai_link->params)
                        continue;

                dapm_connect_dai_link_widgets(card, rtd);
        }
}

static void soc_dapm_stream_event(struct snd_soc_pcm_runtime *rtd, int stream,
        int event)
{
        int i;

        soc_dapm_dai_stream_event(rtd->cpu_dai, stream, event);
        for (i = 0; i < rtd->num_codecs; i++)
                soc_dapm_dai_stream_event(rtd->codec_dais[i], stream, event);

        dapm_power_widgets(rtd->card, event);
}

/**
 * snd_soc_dapm_stream_event - send a stream event to the dapm core
 * @rtd: PCM runtime data
 * @stream: stream name
 * @event: stream event
 *
 * Sends a stream event to the dapm core. The core then makes any
 * necessary widget power changes.
 *
 * Returns 0 for success else error.
 */
void snd_soc_dapm_stream_event(struct snd_soc_pcm_runtime *rtd, int stream,
                              int event)
{
        struct snd_soc_card *card = rtd->card;

        mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
        soc_dapm_stream_event(rtd, stream, event);
        mutex_unlock(&card->dapm_mutex);
}

/**
 * snd_soc_dapm_enable_pin_unlocked - enable pin.
 * @dapm: DAPM context
 * @pin: pin name
 *
 * Enables input/output pin and its parents or children widgets iff there is
 * a valid audio route and active audio stream.
 *
 * Requires external locking.
 *
 * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
 * do any widget power switching.
 */
int snd_soc_dapm_enable_pin_unlocked(struct snd_soc_dapm_context *dapm,
                                   const char *pin)
{
        return snd_soc_dapm_set_pin(dapm, pin, 1);
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_enable_pin_unlocked);

/**
 * snd_soc_dapm_enable_pin - enable pin.
 * @dapm: DAPM context
 * @pin: pin name
 *
 * Enables input/output pin and its parents or children widgets iff there is
 * a valid audio route and active audio stream.
 *
 * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
 * do any widget power switching.
 */
int snd_soc_dapm_enable_pin(struct snd_soc_dapm_context *dapm, const char *pin)
{
        int ret;

        mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);

        ret = snd_soc_dapm_set_pin(dapm, pin, 1);

        mutex_unlock(&dapm->card->dapm_mutex);

        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_enable_pin);

/**
 * snd_soc_dapm_force_enable_pin_unlocked - force a pin to be enabled
 * @dapm: DAPM context
 * @pin: pin name
 *
 * Enables input/output pin regardless of any other state.  This is
 * intended for use with microphone bias supplies used in microphone
 * jack detection.
 *
 * Requires external locking.
 *
 * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
 * do any widget power switching.
 */
int snd_soc_dapm_force_enable_pin_unlocked(struct snd_soc_dapm_context *dapm,
                                         const char *pin)
{
        struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);

        if (!w) {
                dev_err(dapm->dev, "ASoC: unknown pin %s\n", pin);
                return -EINVAL;
        }

        dev_dbg(w->dapm->dev, "ASoC: force enable pin %s\n", pin);
        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);

static void soc_dapm_shutdown_dapm(struct snd_soc_dapm_context *dapm)
{
        struct snd_soc_card *card = dapm->card;
        struct snd_soc_dapm_widget *w;
        LIST_HEAD(down_list);
        int powerdown = 0;

        mutex_lock(&card->dapm_mutex);

        list_for_each_entry(w, &dapm->card->widgets, list) {
                if (w->dapm != dapm)
                        continue;
                if (w->power) {
                        dapm_seq_insert(w, &down_list, false);
                        w->power = 0;
                        powerdown = 1;
                }
        }

        /* If there were no widgets to power down we're already in
         * standby.
         */
        if (powerdown) {
                if (dapm->bias_level == SND_SOC_BIAS_ON)
                        snd_soc_dapm_set_bias_level(dapm,
                                                    SND_SOC_BIAS_PREPARE);
                dapm_seq_run(card, &down_list, 0, false);
                if (dapm->bias_level == SND_SOC_BIAS_PREPARE)
                        snd_soc_dapm_set_bias_level(dapm,
                                                    SND_SOC_BIAS_STANDBY);
        }

        mutex_unlock(&card->dapm_mutex);
}

/*
 * snd_soc_dapm_shutdown - callback for system shutdown
 */
void snd_soc_dapm_shutdown(struct snd_soc_card *card)
{
        struct snd_soc_dapm_context *dapm;

        list_for_each_entry(dapm, &card->dapm_list, list) {
                if (dapm != &card->dapm) {
                        soc_dapm_shutdown_dapm(dapm);
                        if (dapm->bias_level == SND_SOC_BIAS_STANDBY)
                                snd_soc_dapm_set_bias_level(dapm,
                                                            SND_SOC_BIAS_OFF);
                }
        }

        soc_dapm_shutdown_dapm(&card->dapm);
        if (card->dapm.bias_level == SND_SOC_BIAS_STANDBY)
                snd_soc_dapm_set_bias_level(&card->dapm,
                                            SND_SOC_BIAS_OFF);
}

/* Module information */
MODULE_AUTHOR("Liam Girdwood, [email protected]");
MODULE_DESCRIPTION("Dynamic Audio Power Management core for ALSA SoC");
MODULE_LICENSE("GPL");