/*
 * soc-dapm.c  --  ALSA SoC Dynamic Audio Power Management
 *
 * Copyright 2005 Wolfson Microelectronics PLC.
 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 *  Features:
 *    o Changes power status of internal codec blocks depending on the
 *      dynamic configuration of codec internal audio paths and active
 *      DACs/ADCs.
 *    o Platform power domain - can support external components i.e. amps and
 *      mic/meadphone insertion events.
 *    o Automatic Mic Bias support
 *    o Jack insertion power event initiation - e.g. hp insertion will enable
 *      sinks, dacs, etc
 *    o Delayed powerdown of audio susbsystem to reduce pops between a quick
 *      device reopen.
 *
 *  Todo:
 *    o DAPM power change sequencing - allow for configurable per
 *      codec sequences.
 *    o Support for analogue bias optimisation.
 *    o Support for reduced codec oversampling rates.
 *    o Support for reduced codec bias currents.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.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/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>

/* dapm power sequences - make this per codec in the future */
static int dapm_up_seq[] = {
        [snd_soc_dapm_pre] = 0,
        [snd_soc_dapm_supply] = 1,
        [snd_soc_dapm_micbias] = 2,
        [snd_soc_dapm_aif_in] = 3,
        [snd_soc_dapm_aif_out] = 3,
        [snd_soc_dapm_mic] = 4,
        [snd_soc_dapm_mux] = 5,
        [snd_soc_dapm_virt_mux] = 5,
        [snd_soc_dapm_value_mux] = 5,
        [snd_soc_dapm_dac] = 6,
        [snd_soc_dapm_mixer] = 7,
        [snd_soc_dapm_mixer_named_ctl] = 7,
        [snd_soc_dapm_pga] = 8,
        [snd_soc_dapm_adc] = 9,
        [snd_soc_dapm_out_drv] = 10,
        [snd_soc_dapm_hp] = 10,
        [snd_soc_dapm_spk] = 10,
        [snd_soc_dapm_post] = 11,
};

static int dapm_down_seq[] = {
        [snd_soc_dapm_pre] = 0,
        [snd_soc_dapm_adc] = 1,
        [snd_soc_dapm_hp] = 2,
        [snd_soc_dapm_spk] = 2,
        [snd_soc_dapm_out_drv] = 2,
        [snd_soc_dapm_pga] = 4,
        [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_virt_mux] = 9,
        [snd_soc_dapm_value_mux] = 9,
        [snd_soc_dapm_aif_in] = 10,
        [snd_soc_dapm_aif_out] = 10,
        [snd_soc_dapm_supply] = 11,
        [snd_soc_dapm_post] = 12,
};

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);
}

/* 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);
}

/**
 * snd_soc_dapm_set_bias_level - set the bias level for the system
 * @card: audio device
 * @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_card *card,
                                       struct snd_soc_dapm_context *dapm,
                                       enum snd_soc_bias_level level)
{
        int ret = 0;

        switch (level) {
        case SND_SOC_BIAS_ON:
                dev_dbg(dapm->dev, "Setting full bias\n");
                break;
        case SND_SOC_BIAS_PREPARE:
                dev_dbg(dapm->dev, "Setting bias prepare\n");
                break;
        case SND_SOC_BIAS_STANDBY:
                dev_dbg(dapm->dev, "Setting standby bias\n");
                break;
        case SND_SOC_BIAS_OFF:
                dev_dbg(dapm->dev, "Setting bias off\n");
                break;
        default:
                dev_err(dapm->dev, "Setting invalid bias %d\n", level);
                return -EINVAL;
        }

        trace_snd_soc_bias_level_start(card, level);

        if (card && card->set_bias_level)
                ret = card->set_bias_level(card, level);
        if (ret == 0) {
                if (dapm->codec && dapm->codec->driver->set_bias_level)
                        ret = dapm->codec->driver->set_bias_level(dapm->codec, level);
                else
                        dapm->bias_level = level;
        }
        if (ret == 0) {
                if (card && card->set_bias_level_post)
                        ret = card->set_bias_level_post(card, level);
        }

        trace_snd_soc_bias_level_done(card, level);

        return ret;
}

/* set up initial codec paths */
static void dapm_set_path_status(struct snd_soc_dapm_widget *w,
        struct snd_soc_dapm_path *p, int i)
{
        switch (w->id) {
        case snd_soc_dapm_switch:
        case snd_soc_dapm_mixer:
        case snd_soc_dapm_mixer_named_ctl: {
                int val;
                struct soc_mixer_control *mc = (struct soc_mixer_control *)
                        w->kcontrols[i].private_value;
                unsigned int reg = mc->reg;
                unsigned int shift = mc->shift;
                int max = mc->max;
                unsigned int mask = (1 << fls(max)) - 1;
                unsigned int invert = mc->invert;

                val = snd_soc_read(w->codec, reg);
                val = (val >> shift) & mask;

                if ((invert && !val) || (!invert && val))
                        p->connect = 1;
                else
                        p->connect = 0;
        }
        break;
        case snd_soc_dapm_mux: {
                struct soc_enum *e = (struct soc_enum *)w->kcontrols[i].private_value;
                int val, item, bitmask;

                for (bitmask = 1; bitmask < e->max; bitmask <<= 1)
                ;
                val = snd_soc_read(w->codec, e->reg);
                item = (val >> e->shift_l) & (bitmask - 1);

                p->connect = 0;
                for (i = 0; i < e->max; i++) {
                        if (!(strcmp(p->name, e->texts[i])) && item == i)
                                p->connect = 1;
                }
        }
        break;
        case snd_soc_dapm_virt_mux: {
                struct soc_enum *e = (struct soc_enum *)w->kcontrols[i].private_value;

                p->connect = 0;
                /* 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.
                 */
                if (!strcmp(p->name, e->texts[0]))
                        p->connect = 1;
        }
        break;
        case snd_soc_dapm_value_mux: {
                struct soc_enum *e = (struct soc_enum *)
                        w->kcontrols[i].private_value;
                int val, item;

                val = snd_soc_read(w->codec, e->reg);
                val = (val >> e->shift_l) & e->mask;
                for (item = 0; item < e->max; item++) {
                        if (val == e->values[item])
                                break;
                }

                p->connect = 0;
                for (i = 0; i < e->max; i++) {
                        if (!(strcmp(p->name, e->texts[i])) && item == i)
                                p->connect = 1;
                }
        }
        break;
        /* does not effect routing - always connected */
        case snd_soc_dapm_pga:
        case snd_soc_dapm_out_drv:
        case snd_soc_dapm_output:
        case snd_soc_dapm_adc:
        case snd_soc_dapm_input:
        case snd_soc_dapm_dac:
        case snd_soc_dapm_micbias:
        case snd_soc_dapm_vmid:
        case snd_soc_dapm_supply:
        case snd_soc_dapm_aif_in:
        case snd_soc_dapm_aif_out:
                p->connect = 1;
        break;
        /* does effect routing - dynamically connected */
        case snd_soc_dapm_hp:
        case snd_soc_dapm_mic:
        case snd_soc_dapm_spk:
        case snd_soc_dapm_line:
        case snd_soc_dapm_pre:
        case snd_soc_dapm_post:
                p->connect = 0;
        break;
        }
}

/* connect mux widget to its interconnecting audio paths */
static int dapm_connect_mux(struct snd_soc_dapm_context *dapm,
        struct snd_soc_dapm_widget *src, struct snd_soc_dapm_widget *dest,
        struct snd_soc_dapm_path *path, const char *control_name,
        const struct snd_kcontrol_new *kcontrol)
{
        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
        int i;

        for (i = 0; i < e->max; i++) {
                if (!(strcmp(control_name, e->texts[i]))) {
                        list_add(&path->list, &dapm->card->paths);
                        list_add(&path->list_sink, &dest->sources);
                        list_add(&path->list_source, &src->sinks);
                        path->name = (char*)e->texts[i];
                        dapm_set_path_status(dest, path, 0);
                        return 0;
                }
        }

        return -ENODEV;
}

/* connect mixer widget to its interconnecting audio paths */
static int dapm_connect_mixer(struct snd_soc_dapm_context *dapm,
        struct snd_soc_dapm_widget *src, struct snd_soc_dapm_widget *dest,
        struct snd_soc_dapm_path *path, const char *control_name)
{
        int i;

        /* search for mixer kcontrol */
        for (i = 0; i < dest->num_kcontrols; i++) {
                if (!strcmp(control_name, dest->kcontrols[i].name)) {
                        list_add(&path->list, &dapm->card->paths);
                        list_add(&path->list_sink, &dest->sources);
                        list_add(&path->list_source, &src->sinks);
                        path->name = dest->kcontrols[i].name;
                        dapm_set_path_status(dest, path, i);
                        return 0;
                }
        }
        return -ENODEV;
}

/* update dapm codec register bits */
static int dapm_update_bits(struct snd_soc_dapm_widget *widget)
{
        int change, power;
        unsigned int old, new;
        struct snd_soc_codec *codec = widget->codec;
        struct snd_soc_dapm_context *dapm = widget->dapm;
        struct snd_soc_card *card = dapm->card;

        /* check for valid widgets */
        if (widget->reg < 0 || widget->id == snd_soc_dapm_input ||
                widget->id == snd_soc_dapm_output ||
                widget->id == snd_soc_dapm_hp ||
                widget->id == snd_soc_dapm_mic ||
                widget->id == snd_soc_dapm_line ||
                widget->id == snd_soc_dapm_spk)
                return 0;

        power = widget->power;
        if (widget->invert)
                power = (power ? 0:1);

        old = snd_soc_read(codec, widget->reg);
        new = (old & ~(0x1 << widget->shift)) | (power << widget->shift);

        change = old != new;
        if (change) {
                pop_dbg(dapm->dev, card->pop_time,
                        "pop test %s : %s in %d ms\n",
                        widget->name, widget->power ? "on" : "off",
                        card->pop_time);
                pop_wait(card->pop_time);
                snd_soc_write(codec, widget->reg, new);
        }
        dev_dbg(dapm->dev, "reg %x old %x new %x change %d\n", widget->reg,
                old, new, change);
        return change;
}

/* create new dapm mixer control */
static int dapm_new_mixer(struct snd_soc_dapm_context *dapm,
        struct snd_soc_dapm_widget *w)
{
        int i, ret = 0;
        size_t name_len;
        struct snd_soc_dapm_path *path;
        struct snd_card *card = dapm->codec->card->snd_card;

        /* add kcontrol */
        for (i = 0; i < w->num_kcontrols; i++) {

                /* match name */
                list_for_each_entry(path, &w->sources, list_sink) {

                        /* mixer/mux paths name must match control name */
                        if (path->name != (char*)w->kcontrols[i].name)
                                continue;

                        /* add dapm control with long name.
                         * for dapm_mixer this is the concatenation of the
                         * mixer and kcontrol name.
                         * for dapm_mixer_named_ctl this is simply the
                         * kcontrol name.
                         */
                        name_len = strlen(w->kcontrols[i].name) + 1;
                        if (w->id != snd_soc_dapm_mixer_named_ctl)
                                name_len += 1 + strlen(w->name);

                        path->long_name = kmalloc(name_len, GFP_KERNEL);

                        if (path->long_name == NULL)
                                return -ENOMEM;

                        switch (w->id) {
                        default:
                                snprintf(path->long_name, name_len, "%s %s",
                                         w->name, w->kcontrols[i].name);
                                break;
                        case snd_soc_dapm_mixer_named_ctl:
                                snprintf(path->long_name, name_len, "%s",
                                         w->kcontrols[i].name);
                                break;
                        }

                        path->long_name[name_len - 1] = '\0';

                        path->kcontrol = snd_soc_cnew(&w->kcontrols[i], w,
                                path->long_name);
                        ret = snd_ctl_add(card, path->kcontrol);
                        if (ret < 0) {
                                dev_err(dapm->dev,
                                        "asoc: failed to add dapm kcontrol %s: %d\n",
                                        path->long_name, ret);
                                kfree(path->long_name);
                                path->long_name = NULL;
                                return ret;
                        }
                }
        }
        return ret;
}

/* create new dapm mux control */
static int dapm_new_mux(struct snd_soc_dapm_context *dapm,
        struct snd_soc_dapm_widget *w)
{
        struct snd_soc_dapm_path *path = NULL;
        struct snd_kcontrol *kcontrol;
        struct snd_card *card = dapm->codec->card->snd_card;
        int ret = 0;

        if (!w->num_kcontrols) {
                dev_err(dapm->dev, "asoc: mux %s has no controls\n", w->name);
                return -EINVAL;
        }

        kcontrol = snd_soc_cnew(&w->kcontrols[0], w, w->name);
        ret = snd_ctl_add(card, kcontrol);

        if (ret < 0)
                goto err;

        list_for_each_entry(path, &w->sources, list_sink)
                path->kcontrol = kcontrol;

        return ret;

err:
        dev_err(dapm->dev, "asoc: failed to add kcontrol %s\n", w->name);
        return ret;
}

/* create new dapm volume control */
static int dapm_new_pga(struct snd_soc_dapm_context *dapm,
        struct snd_soc_dapm_widget *w)
{
        if (w->num_kcontrols)
                dev_err(w->dapm->dev,
                        "asoc: PGA controls not supported: '%s'\n", w->name);

        return 0;
}

/* reset 'walked' bit for each dapm path */
static inline void dapm_clear_walk(struct snd_soc_dapm_context *dapm)
{
        struct snd_soc_dapm_path *p;

        list_for_each_entry(p, &dapm->card->paths, list)
                p->walked = 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->codec->card->snd_card);

        switch (level) {
        case SNDRV_CTL_POWER_D3hot:
        case SNDRV_CTL_POWER_D3cold:
                if (widget->ignore_suspend)
                        dev_dbg(widget->dapm->dev, "%s ignoring suspend\n",
                                widget->name);
                return widget->ignore_suspend;
        default:
                return 1;
        }
}

/*
 * Recursively check for a completed path to an active or physically connected
 * output widget. Returns number of complete paths.
 */
static int is_connected_output_ep(struct snd_soc_dapm_widget *widget)
{
        struct snd_soc_dapm_path *path;
        int con = 0;

        if (widget->id == snd_soc_dapm_supply)
                return 0;

        switch (widget->id) {
        case snd_soc_dapm_adc:
        case snd_soc_dapm_aif_out:
                if (widget->active)
                        return snd_soc_dapm_suspend_check(widget);
        default:
                break;
        }

        if (widget->connected) {
                /* connected pin ? */
                if (widget->id == snd_soc_dapm_output && !widget->ext)
                        return snd_soc_dapm_suspend_check(widget);

                /* connected jack or spk ? */
                if (widget->id == snd_soc_dapm_hp || widget->id == snd_soc_dapm_spk ||
                    (widget->id == snd_soc_dapm_line && !list_empty(&widget->sources)))
                        return snd_soc_dapm_suspend_check(widget);
        }

        list_for_each_entry(path, &widget->sinks, list_source) {
                if (path->walked)
                        continue;

                if (path->sink && path->connect) {
                        path->walked = 1;
                        con += is_connected_output_ep(path->sink);
                }
        }

        return con;
}

/*
 * Recursively check for a completed path to an active or physically connected
 * input widget. Returns number of complete paths.
 */
static int is_connected_input_ep(struct snd_soc_dapm_widget *widget)
{
        struct snd_soc_dapm_path *path;
        int con = 0;

        if (widget->id == snd_soc_dapm_supply)
                return 0;

        /* active stream ? */
        switch (widget->id) {
        case snd_soc_dapm_dac:
        case snd_soc_dapm_aif_in:
                if (widget->active)
                        return snd_soc_dapm_suspend_check(widget);
        default:
                break;
        }

        if (widget->connected) {
                /* connected pin ? */
                if (widget->id == snd_soc_dapm_input && !widget->ext)
                        return snd_soc_dapm_suspend_check(widget);

                /* connected VMID/Bias for lower pops */
                if (widget->id == snd_soc_dapm_vmid)
                        return snd_soc_dapm_suspend_check(widget);

                /* connected jack ? */
                if (widget->id == snd_soc_dapm_mic ||
                    (widget->id == snd_soc_dapm_line && !list_empty(&widget->sinks)))
                        return snd_soc_dapm_suspend_check(widget);
        }

        list_for_each_entry(path, &widget->sources, list_sink) {
                if (path->walked)
                        continue;

                if (path->source && path->connect) {
                        path->walked = 1;
                        con += is_connected_input_ep(path->source);
                }
        }

        return con;
}

/*
 * Handler for generic register modifier widget.
 */
int dapm_reg_event(struct snd_soc_dapm_widget *w,
                   struct snd_kcontrol *kcontrol, int event)
{
        unsigned int val;

        if (SND_SOC_DAPM_EVENT_ON(event))
                val = w->on_val;
        else
                val = w->off_val;

        snd_soc_update_bits(w->codec, -(w->reg + 1),
                            w->mask << w->shift, val << w->shift);

        return 0;
}
EXPORT_SYMBOL_GPL(dapm_reg_event);

/* Standard power change method, used to apply power changes to most
 * widgets.
 */
static int dapm_generic_apply_power(struct snd_soc_dapm_widget *w)
{
        int ret;

        /* call any power change event handlers */
        if (w->event)
                dev_dbg(w->dapm->dev, "power %s event for %s flags %x\n",
                         w->power ? "on" : "off",
                         w->name, w->event_flags);

        /* power up pre event */
        if (w->power && w->event &&
            (w->event_flags & SND_SOC_DAPM_PRE_PMU)) {
                ret = w->event(w, NULL, SND_SOC_DAPM_PRE_PMU);
                if (ret < 0)
                        return ret;
        }

        /* power down pre event */
        if (!w->power && w->event &&
            (w->event_flags & SND_SOC_DAPM_PRE_PMD)) {
                ret = w->event(w, NULL, SND_SOC_DAPM_PRE_PMD);
                if (ret < 0)
                        return ret;
        }

        dapm_update_bits(w);

        /* power up post event */
        if (w->power && w->event &&
            (w->event_flags & SND_SOC_DAPM_POST_PMU)) {
                ret = w->event(w,
                               NULL, SND_SOC_DAPM_POST_PMU);
                if (ret < 0)
                        return ret;
        }

        /* power down post event */
        if (!w->power && w->event &&
            (w->event_flags & SND_SOC_DAPM_POST_PMD)) {
                ret = w->event(w, NULL, SND_SOC_DAPM_POST_PMD);
                if (ret < 0)
                        return ret;
        }

        return 0;
}

/* 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;

        in = is_connected_input_ep(w);
        dapm_clear_walk(w->dapm);
        out = is_connected_output_ep(w);
        dapm_clear_walk(w->dapm);
        return out != 0 && in != 0;
}

/* Check to see if an ADC has power */
static int dapm_adc_check_power(struct snd_soc_dapm_widget *w)
{
        int in;

        if (w->active) {
                in = is_connected_input_ep(w);
                dapm_clear_walk(w->dapm);
                return in != 0;
        } else {
                return dapm_generic_check_power(w);
        }
}

/* Check to see if a DAC has power */
static int dapm_dac_check_power(struct snd_soc_dapm_widget *w)
{
        int out;

        if (w->active) {
                out = is_connected_output_ep(w);
                dapm_clear_walk(w->dapm);
                return out != 0;
        } else {
                return dapm_generic_check_power(w);
        }
}

/* Check to see if a power supply is needed */
static int dapm_supply_check_power(struct snd_soc_dapm_widget *w)
{
        struct snd_soc_dapm_path *path;
        int power = 0;

        /* Check if one of our outputs is connected */
        list_for_each_entry(path, &w->sinks, list_source) {
                if (path->connected &&
                    !path->connected(path->source, path->sink))
                        continue;

                if (!path->sink)
                        continue;

                if (path->sink->force) {
                        power = 1;
                        break;
                }

                if (path->sink->power_check &&
                    path->sink->power_check(path->sink)) {
                        power = 1;
                        break;
                }
        }

        dapm_clear_walk(w->dapm);

        return power;
}

static int dapm_seq_compare(struct snd_soc_dapm_widget *a,
                            struct snd_soc_dapm_widget *b,
                            int sort[])
{
        if (sort[a->id] != sort[b->id])
                return sort[a->id] - sort[b->id];
        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,
                            int sort[])
{
        struct snd_soc_dapm_widget *w;

        list_for_each_entry(w, list, power_list)
                if (dapm_seq_compare(new_widget, w, sort) < 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_dapm_context *dapm,
                                 struct snd_soc_dapm_widget *w, int event)
{
        struct snd_soc_card *card = dapm->card;
        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;
        default:
                BUG();
                return;
        }

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

        if (w->event && (w->event_flags & event)) {
                pop_dbg(dapm->dev, card->pop_time, "pop test : %s %s\n",
                        w->name, ev_name);
                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)
                        pr_err("%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_dapm_context *dapm,
                                   struct list_head *pending)
{
        struct snd_soc_card *card = dapm->card;
        struct snd_soc_dapm_widget *w;
        int reg, power;
        unsigned int value = 0;
        unsigned int mask = 0;
        unsigned int cur_mask;

        reg = list_first_entry(pending, struct snd_soc_dapm_widget,
                               power_list)->reg;

        list_for_each_entry(w, pending, power_list) {
                cur_mask = 1 << w->shift;
                BUG_ON(reg != w->reg);

                if (w->invert)
                        power = !w->power;
                else
                        power = w->power;

                mask |= cur_mask;
                if (power)
                        value |= cur_mask;

                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(dapm, w, SND_SOC_DAPM_PRE_PMU);
                dapm_seq_check_event(dapm, w, SND_SOC_DAPM_PRE_PMD);
        }

        if (reg >= 0) {
                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);
                snd_soc_update_bits(dapm->codec, reg, mask, value);
        }

        list_for_each_entry(w, pending, power_list) {
                dapm_seq_check_event(dapm, w, SND_SOC_DAPM_POST_PMU);
                dapm_seq_check_event(dapm, 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_dapm_context *dapm,
                         struct list_head *list, int event, int sort[])
{
        struct snd_soc_dapm_widget *w, *n;
        LIST_HEAD(pending);
        int cur_sort = -1;
        int cur_reg = SND_SOC_NOPM;
        struct snd_soc_dapm_context *cur_dapm = NULL;
        int ret;

        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) {
                        if (!list_empty(&pending))
                                dapm_seq_run_coalesced(cur_dapm, &pending);

                        INIT_LIST_HEAD(&pending);
                        cur_sort = -1;
                        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;

                case snd_soc_dapm_input:
                case snd_soc_dapm_output:
                case snd_soc_dapm_hp:
                case snd_soc_dapm_mic:
                case snd_soc_dapm_line:
                case snd_soc_dapm_spk:
                        /* No register support currently */
                        ret = dapm_generic_apply_power(w);
                        break;

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

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

        if (!list_empty(&pending))
                dapm_seq_run_coalesced(cur_dapm, &pending);
}

static void dapm_widget_update(struct snd_soc_dapm_context *dapm)
{
        struct snd_soc_dapm_update *update = dapm->update;
        struct snd_soc_dapm_widget *w;
        int ret;

        if (!update)
                return;

        w = update->widget;

        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)
                        pr_err("%s DAPM pre-event failed: %d\n",
                               w->name, ret);
        }

        ret = snd_soc_update_bits(w->codec, update->reg, update->mask,
                                  update->val);
        if (ret < 0)
                pr_err("%s DAPM update failed: %d\n", w->name, ret);

        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)
                        pr_err("%s DAPM post-event failed: %d\n",
                               w->name, ret);
        }
}



/*
 * 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_dapm_context *dapm, int event)
{
        struct snd_soc_card *card = dapm->codec->card;
        struct snd_soc_dapm_widget *w;
        struct snd_soc_dapm_context *d;
        LIST_HEAD(up_list);
        LIST_HEAD(down_list);
        int ret = 0;
        int power;

        trace_snd_soc_dapm_start(card);

        list_for_each_entry(d, &card->dapm_list, list)
                if (d->n_widgets)
                        d->dev_power = 0;

        /* Check which widgets we need to power and store them in
         * lists indicating if they should be powered up or down.
         */
        list_for_each_entry(w, &card->widgets, list) {
                switch (w->id) {
                case snd_soc_dapm_pre:
                        dapm_seq_insert(w, &down_list, dapm_down_seq);
                        break;
                case snd_soc_dapm_post:
                        dapm_seq_insert(w, &up_list, dapm_up_seq);
                        break;

                default:
                        if (!w->power_check)
                                continue;

                        if (!w->force)
                                power = w->power_check(w);
                        else
                                power = 1;
                        if (power)
                                w->dapm->dev_power = 1;

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

                        trace_snd_soc_dapm_widget_power(w, power);

                        if (power)
                                dapm_seq_insert(w, &up_list, dapm_up_seq);
                        else
                                dapm_seq_insert(w, &down_list, dapm_down_seq);

                        w->power = power;
                        break;
                }
        }

        /* If there are no DAPM widgets then try to figure out power from the
         * event type.
         */
        if (!dapm->n_widgets) {
                switch (event) {
                case SND_SOC_DAPM_STREAM_START:
                case SND_SOC_DAPM_STREAM_RESUME:
                        dapm->dev_power = 1;
                        break;
                case SND_SOC_DAPM_STREAM_STOP:
                        dapm->dev_power = !!dapm->codec->active;
                        break;
                case SND_SOC_DAPM_STREAM_SUSPEND:
                        dapm->dev_power = 0;
                        break;
                case SND_SOC_DAPM_STREAM_NOP:
                        switch (dapm->bias_level) {
                                case SND_SOC_BIAS_STANDBY:
                                case SND_SOC_BIAS_OFF:
                                        dapm->dev_power = 0;
                                        break;
                                default:
                                        dapm->dev_power = 1;
                                        break;
                        }
                        break;
                default:
                        break;
                }
        }

        list_for_each_entry(d, &dapm->card->dapm_list, list) {
                if (d->dev_power && d->bias_level == SND_SOC_BIAS_OFF) {
                        ret = snd_soc_dapm_set_bias_level(card, d,
                                                          SND_SOC_BIAS_STANDBY);
                        if (ret != 0)
                                dev_err(d->dev,
                                        "Failed to turn on bias: %d\n", ret);
                }

                /* If we're changing to all on or all off then prepare */
                if ((d->dev_power && d->bias_level == SND_SOC_BIAS_STANDBY) ||
                    (!d->dev_power && d->bias_level == SND_SOC_BIAS_ON)) {
                        ret = snd_soc_dapm_set_bias_level(card, d,
                                                          SND_SOC_BIAS_PREPARE);
                        if (ret != 0)
                                dev_err(d->dev,
                                        "Failed to prepare bias: %d\n", ret);
                }
        }

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

        dapm_widget_update(dapm);

        /* Now power up. */
        dapm_seq_run(dapm, &up_list, event, dapm_up_seq);

        list_for_each_entry(d, &dapm->card->dapm_list, list) {
                /* If we just powered the last thing off drop to standby bias */
                if (d->bias_level == SND_SOC_BIAS_PREPARE && !d->dev_power) {
                        ret = snd_soc_dapm_set_bias_level(card, d,
                                                          SND_SOC_BIAS_STANDBY);
                        if (ret != 0)
                                dev_err(d->dev,
                                        "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->idle_bias_off) {
                        ret = snd_soc_dapm_set_bias_level(card, d,
                                                          SND_SOC_BIAS_OFF);
                        if (ret != 0)
                                dev_err(d->dev,
                                        "Failed to turn off bias: %d\n", ret);
                }

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

        pop_dbg(dapm->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 int dapm_widget_power_open_file(struct inode *inode, struct file *file)
{
        file->private_data = inode->i_private;
        return 0;
}

static ssize_t dapm_widget_power_read_file(struct file *file,
                                           char __user *user_buf,
                                           size_t count, loff_t *ppos)
{
        struct snd_soc_dapm_widget *w = file->private_data;
        char *buf;
        int in, out;
        ssize_t ret;
        struct snd_soc_dapm_path *p = NULL;

        buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;

        in = is_connected_input_ep(w);
        dapm_clear_walk(w->dapm);
        out = is_connected_output_ep(w);
        dapm_clear_walk(w->dapm);

        ret = snprintf(buf, PAGE_SIZE, "%s: %s  in %d out %d",
                       w->name, w->power ? "On" : "Off", in, out);

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

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

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

        list_for_each_entry(p, &w->sources, list_sink) {
                if (p->connected && !p->connected(w, p->sink))
                        continue;

                if (p->connect)
                        ret += snprintf(buf + ret, PAGE_SIZE - ret,
                                        " in  %s %s\n",
                                        p->name ? p->name : "static",
                                        p->source->name);
        }
        list_for_each_entry(p, &w->sinks, list_source) {
                if (p->connected && !p->connected(w, p->sink))
                        continue;

                if (p->connect)
                        ret += snprintf(buf + ret, PAGE_SIZE - ret,
                                        " out %s %s\n",
                                        p->name ? p->name : "static",
                                        p->sink->name);
        }

        ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);

        kfree(buf);
        return ret;
}

static const struct file_operations dapm_widget_power_fops = {
        .open = dapm_widget_power_open_file,
        .read = dapm_widget_power_read_file,
        .llseek = default_llseek,
};

void snd_soc_dapm_debugfs_init(struct snd_soc_dapm_context *dapm)
{
        struct snd_soc_dapm_widget *w;
        struct dentry *d;

        if (!dapm->debugfs_dapm)
                return;

        list_for_each_entry(w, &dapm->card->widgets, list) {
                if (!w->name || w->dapm != dapm)
                        continue;

                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);
        }
}
#else
void snd_soc_dapm_debugfs_init(struct snd_soc_dapm_context *dapm)
{
}
#endif

/* test and update the power status of a mux widget */
static int dapm_mux_update_power(struct snd_soc_dapm_widget *widget,
                                 struct snd_kcontrol *kcontrol, int change,
                                 int mux, struct soc_enum *e)
{
        struct snd_soc_dapm_path *path;
        int found = 0;

        if (widget->id != snd_soc_dapm_mux &&
            widget->id != snd_soc_dapm_virt_mux &&
            widget->id != snd_soc_dapm_value_mux)
                return -ENODEV;

        if (!change)
                return 0;

        /* find dapm widget path assoc with kcontrol */
        list_for_each_entry(path, &widget->dapm->card->paths, list) {
                if (path->kcontrol != kcontrol)
                        continue;

                if (!path->name || !e->texts[mux])
                        continue;

                found = 1;
                /* we now need to match the string in the enum to the path */
                if (!(strcmp(path->name, e->texts[mux])))
                        path->connect = 1; /* new connection */
                else
                        path->connect = 0; /* old connection must be powered down */
        }

        if (found)
                dapm_power_widgets(widget->dapm, SND_SOC_DAPM_STREAM_NOP);

        return 0;
}

/* test and update the power status of a mixer or switch widget */
static int dapm_mixer_update_power(struct snd_soc_dapm_widget *widget,
                                   struct snd_kcontrol *kcontrol, int connect)
{
        struct snd_soc_dapm_path *path;
        int found = 0;

        if (widget->id != snd_soc_dapm_mixer &&
            widget->id != snd_soc_dapm_mixer_named_ctl &&
            widget->id != snd_soc_dapm_switch)
                return -ENODEV;

        /* find dapm widget path assoc with kcontrol */
        list_for_each_entry(path, &widget->dapm->card->paths, list) {
                if (path->kcontrol != kcontrol)
                        continue;

                /* found, now check type */
                found = 1;
                path->connect = connect;
                break;
        }

        if (found)
                dapm_power_widgets(widget->dapm, SND_SOC_DAPM_STREAM_NOP);

        return 0;
}

/* 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 =
                        container_of(dev, struct snd_soc_pcm_runtime, dev);
        struct snd_soc_codec *codec =rtd->codec;
        struct snd_soc_dapm_widget *w;
        int count = 0;
        char *state = "not set";

        list_for_each_entry(w, &codec->card->widgets, list) {
                if (w->dapm != &codec->dapm)
                        continue;

                /* only display widgets that burnm power */
                switch (w->id) {
                case snd_soc_dapm_hp:
                case snd_soc_dapm_mic:
                case snd_soc_dapm_spk:
                case snd_soc_dapm_line:
                case snd_soc_dapm_micbias:
                case snd_soc_dapm_dac:
                case snd_soc_dapm_adc:
                case snd_soc_dapm_pga:
                case snd_soc_dapm_out_drv:
                case snd_soc_dapm_mixer:
                case snd_soc_dapm_mixer_named_ctl:
                case snd_soc_dapm_supply:
                        if (w->name)
                                count += sprintf(buf + count, "%s: %s\n",
                                        w->name, w->power ? "On":"Off");
                break;
                default:
                break;
                }
        }

        switch (codec->dapm.bias_level) {
        case SND_SOC_BIAS_ON:
                state = "On";
                break;
        case SND_SOC_BIAS_PREPARE:
                state = "Prepare";
                break;
        case SND_SOC_BIAS_STANDBY:
                state = "Standby";
                break;
        case SND_SOC_BIAS_OFF:
                state = "Off";
                break;
        }
        count += sprintf(buf + count, "PM State: %s\n", state);

        return count;
}

static DEVICE_ATTR(dapm_widget, 0444, dapm_widget_show, NULL);

int snd_soc_dapm_sys_add(struct device *dev)
{
        return device_create_file(dev, &dev_attr_dapm_widget);
}

static void snd_soc_dapm_sys_remove(struct device *dev)
{
        device_remove_file(dev, &dev_attr_dapm_widget);
}

/* free all dapm widgets and resources */
static void dapm_free_widgets(struct snd_soc_dapm_context *dapm)
{
        struct snd_soc_dapm_widget *w, *next_w;
        struct snd_soc_dapm_path *p, *next_p;

        list_for_each_entry_safe(w, next_w, &dapm->card->widgets, list) {
                if (w->dapm != dapm)
                        continue;
                list_del(&w->list);
                /*
                 * remove source and sink paths associated to this widget.
                 * While removing the path, remove reference to it from both
                 * source and sink widgets so that path is removed only once.
                 */
                list_for_each_entry_safe(p, next_p, &w->sources, list_sink) {
                        list_del(&p->list_sink);
                        list_del(&p->list_source);
                        list_del(&p->list);
                        kfree(p->long_name);
                        kfree(p);
                }
                list_for_each_entry_safe(p, next_p, &w->sinks, list_source) {
                        list_del(&p->list_sink);
                        list_del(&p->list_source);
                        list_del(&p->list);
                        kfree(p->long_name);
                        kfree(p);
                }
                kfree(w->name);
                kfree(w);
        }
}

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

        list_for_each_entry(w, &dapm->card->widgets, list) {
                if (w->dapm != dapm)
                        continue;
                if (!strcmp(w->name, pin)) {
                        dev_dbg(w->dapm->dev, "dapm: pin %s = %d\n",
                                pin, status);
                        w->connected = status;
                        /* Allow disabling of forced pins */
                        if (status == 0)
                                w->force = 0;
                        return 0;
                }
        }

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

/**
 * 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)
{
        return dapm_power_widgets(dapm, SND_SOC_DAPM_STREAM_NOP);
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_sync);

static int snd_soc_dapm_add_route(struct snd_soc_dapm_context *dapm,
                                  const struct snd_soc_dapm_route *route)
{
        struct snd_soc_dapm_path *path;
        struct snd_soc_dapm_widget *wsource = NULL, *wsink = NULL, *w;
        struct snd_soc_dapm_widget *wtsource = NULL, *wtsink = NULL;
        const char *sink;
        const char *control = route->control;
        const char *source;
        char prefixed_sink[80];
        char prefixed_source[80];
        int ret = 0;

        if (dapm->codec->name_prefix) {
                snprintf(prefixed_sink, sizeof(prefixed_sink), "%s %s",
                         dapm->codec->name_prefix, route->sink);
                sink = prefixed_sink;
                snprintf(prefixed_source, sizeof(prefixed_source), "%s %s",
                         dapm->codec->name_prefix, route->source);
                source = prefixed_source;
        } else {
                sink = route->sink;
                source = route->source;
        }

        /*
         * find src and dest widgets over all widgets but favor a widget from
         * current DAPM context
         */
        list_for_each_entry(w, &dapm->card->widgets, list) {
                if (!wsink && !(strcmp(w->name, sink))) {
                        wtsink = w;
                        if (w->dapm == dapm)
                                wsink = w;
                        continue;
                }
                if (!wsource && !(strcmp(w->name, source))) {
                        wtsource = w;
                        if (w->dapm == dapm)
                                wsource = w;
                }
        }
        /* use widget from another DAPM context if not found from this */
        if (!wsink)
                wsink = wtsink;
        if (!wsource)
                wsource = wtsource;

        if (wsource == NULL || wsink == NULL)
                return -ENODEV;

        path = kzalloc(sizeof(struct snd_soc_dapm_path), GFP_KERNEL);
        if (!path)
                return -ENOMEM;

        path->source = wsource;
        path->sink = wsink;
        path->connected = route->connected;
        INIT_LIST_HEAD(&path->list);
        INIT_LIST_HEAD(&path->list_source);
        INIT_LIST_HEAD(&path->list_sink);

        /* check for external widgets */
        if (wsink->id == snd_soc_dapm_input) {
                if (wsource->id == snd_soc_dapm_micbias ||
                        wsource->id == snd_soc_dapm_mic ||
                        wsource->id == snd_soc_dapm_line ||
                        wsource->id == snd_soc_dapm_output)
                        wsink->ext = 1;
        }
        if (wsource->id == snd_soc_dapm_output) {
                if (wsink->id == snd_soc_dapm_spk ||
                        wsink->id == snd_soc_dapm_hp ||
                        wsink->id == snd_soc_dapm_line ||
                        wsink->id == snd_soc_dapm_input)
                        wsource->ext = 1;
        }

        /* connect static paths */
        if (control == NULL) {
                list_add(&path->list, &dapm->card->paths);
                list_add(&path->list_sink, &wsink->sources);
                list_add(&path->list_source, &wsource->sinks);
                path->connect = 1;
                return 0;
        }

        /* connect dynamic paths */
        switch(wsink->id) {
        case snd_soc_dapm_adc:
        case snd_soc_dapm_dac:
        case snd_soc_dapm_pga:
        case snd_soc_dapm_out_drv:
        case snd_soc_dapm_input:
        case snd_soc_dapm_output:
        case snd_soc_dapm_micbias:
        case snd_soc_dapm_vmid:
        case snd_soc_dapm_pre:
        case snd_soc_dapm_post:
        case snd_soc_dapm_supply:
        case snd_soc_dapm_aif_in:
        case snd_soc_dapm_aif_out:
                list_add(&path->list, &dapm->card->paths);
                list_add(&path->list_sink, &wsink->sources);
                list_add(&path->list_source, &wsource->sinks);
                path->connect = 1;
                return 0;
        case snd_soc_dapm_mux:
        case snd_soc_dapm_virt_mux:
        case snd_soc_dapm_value_mux:
                ret = dapm_connect_mux(dapm, wsource, wsink, path, control,
                        &wsink->kcontrols[0]);
                if (ret != 0)
                        goto err;
                break;
        case snd_soc_dapm_switch:
        case snd_soc_dapm_mixer:
        case snd_soc_dapm_mixer_named_ctl:
                ret = dapm_connect_mixer(dapm, wsource, wsink, path, control);
                if (ret != 0)
                        goto err;
                break;
        case snd_soc_dapm_hp:
        case snd_soc_dapm_mic:
        case snd_soc_dapm_line:
        case snd_soc_dapm_spk:
                list_add(&path->list, &dapm->card->paths);
                list_add(&path->list_sink, &wsink->sources);
                list_add(&path->list_source, &wsource->sinks);
                path->connect = 0;
                return 0;
        }
        return 0;

err:
        dev_warn(dapm->dev, "asoc: no dapm match for %s --> %s --> %s\n",
                 source, control, sink);
        kfree(path);
        return ret;
}

/**
 * snd_soc_dapm_add_routes - Add routes between DAPM widgets
 * @dapm: DAPM context
 * @route: audio routes
 * @num: number of routes
 *
 * Connects 2 dapm widgets together via a named audio path. The sink is
 * the widget receiving the audio signal, whilst the source is the sender
 * of the audio signal.
 *
 * Returns 0 for success else error. On error all resources can be freed
 * with a call to snd_soc_card_free().
 */
int snd_soc_dapm_add_routes(struct snd_soc_dapm_context *dapm,
                            const struct snd_soc_dapm_route *route, int num)
{
        int i, ret;

        for (i = 0; i < num; i++) {
                ret = snd_soc_dapm_add_route(dapm, route);
                if (ret < 0) {
                        dev_err(dapm->dev, "Failed to add route %s->%s\n",
                                route->source, route->sink);
                        return ret;
                }
                route++;
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_add_routes);

/**
 * snd_soc_dapm_new_widgets - add new dapm widgets
 * @dapm: DAPM context
 *
 * Checks the codec for any new dapm widgets and creates them if found.
 *
 * Returns 0 for success.
 */
int snd_soc_dapm_new_widgets(struct snd_soc_dapm_context *dapm)
{
        struct snd_soc_dapm_widget *w;
        unsigned int val;

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

                switch(w->id) {
                case snd_soc_dapm_switch:
                case snd_soc_dapm_mixer:
                case snd_soc_dapm_mixer_named_ctl:
                        w->power_check = dapm_generic_check_power;
                        dapm_new_mixer(dapm, w);
                        break;
                case snd_soc_dapm_mux:
                case snd_soc_dapm_virt_mux:
                case snd_soc_dapm_value_mux:
                        w->power_check = dapm_generic_check_power;
                        dapm_new_mux(dapm, w);
                        break;
                case snd_soc_dapm_adc:
                case snd_soc_dapm_aif_out:
                        w->power_check = dapm_adc_check_power;
                        break;
                case snd_soc_dapm_dac:
                case snd_soc_dapm_aif_in:
                        w->power_check = dapm_dac_check_power;
                        break;
                case snd_soc_dapm_pga:
                case snd_soc_dapm_out_drv:
                        w->power_check = dapm_generic_check_power;
                        dapm_new_pga(dapm, w);
                        break;
                case snd_soc_dapm_input:
                case snd_soc_dapm_output:
                case snd_soc_dapm_micbias:
                case snd_soc_dapm_spk:
                case snd_soc_dapm_hp:
                case snd_soc_dapm_mic:
                case snd_soc_dapm_line:
                        w->power_check = dapm_generic_check_power;
                        break;
                case snd_soc_dapm_supply:
                        w->power_check = dapm_supply_check_power;
                case snd_soc_dapm_vmid:
                case snd_soc_dapm_pre:
                case snd_soc_dapm_post:
                        break;
                }

                /* Read the initial power state from the device */
                if (w->reg >= 0) {
                        val = snd_soc_read(w->codec, w->reg);
                        val &= 1 << w->shift;
                        if (w->invert)
                                val = !val;

                        if (val)
                                w->power = 1;
                }

                w->new = 1;
        }

        dapm_power_widgets(dapm, SND_SOC_DAPM_STREAM_NOP);
        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_widget *widget = snd_kcontrol_chip(kcontrol);
        struct soc_mixer_control *mc =
                (struct soc_mixer_control *)kcontrol->private_value;
        unsigned int reg = mc->reg;
        unsigned int shift = mc->shift;
        unsigned int rshift = mc->rshift;
        int max = mc->max;
        unsigned int invert = mc->invert;
        unsigned int mask = (1 << fls(max)) - 1;

        ucontrol->value.integer.value[0] =
                (snd_soc_read(widget->codec, reg) >> shift) & mask;
        if (shift != rshift)
                ucontrol->value.integer.value[1] =
                        (snd_soc_read(widget->codec, reg) >> rshift) & mask;
        if (invert) {
                ucontrol->value.integer.value[0] =
                        max - ucontrol->value.integer.value[0];
                if (shift != rshift)
                        ucontrol->value.integer.value[1] =
                                max - ucontrol->value.integer.value[1];
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_get_volsw);

/**
 * snd_soc_dapm_put_volsw - dapm mixer set callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to set the value of a dapm mixer control.
 *
 * Returns 0 for success.
 */
int snd_soc_dapm_put_volsw(struct snd_kcontrol *kcontrol,
        struct snd_ctl_elem_value *ucontrol)
{
        struct snd_soc_dapm_widget *widget = snd_kcontrol_chip(kcontrol);
        struct soc_mixer_control *mc =
                (struct soc_mixer_control *)kcontrol->private_value;
        unsigned int reg = mc->reg;
        unsigned int shift = mc->shift;
        int max = mc->max;
        unsigned int mask = (1 << fls(max)) - 1;
        unsigned int invert = mc->invert;
        unsigned int val;
        int connect, change;
        struct snd_soc_dapm_update update;

        val = (ucontrol->value.integer.value[0] & mask);

        if (invert)
                val = max - val;
        mask = mask << shift;
        val = val << shift;

        mutex_lock(&widget->codec->mutex);
        widget->value = val;

        change = snd_soc_test_bits(widget->codec, reg, mask, val);
        if (change) {
                if (val)
                        /* new connection */
                        connect = invert ? 0:1;
                else
                        /* old connection must be powered down */
                        connect = invert ? 1:0;

                update.kcontrol = kcontrol;
                update.widget = widget;
                update.reg = reg;
                update.mask = mask;
                update.val = val;
                widget->dapm->update = &update;

                dapm_mixer_update_power(widget, kcontrol, connect);

                widget->dapm->update = NULL;
        }

        mutex_unlock(&widget->codec->mutex);
        return 0;
}
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_widget *widget = snd_kcontrol_chip(kcontrol);
        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
        unsigned int val, bitmask;

        for (bitmask = 1; bitmask < e->max; bitmask <<= 1)
                ;
        val = snd_soc_read(widget->codec, e->reg);
        ucontrol->value.enumerated.item[0] = (val >> e->shift_l) & (bitmask - 1);
        if (e->shift_l != e->shift_r)
                ucontrol->value.enumerated.item[1] =
                        (val >> e->shift_r) & (bitmask - 1);

        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_widget *widget = snd_kcontrol_chip(kcontrol);
        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
        unsigned int val, mux, change;
        unsigned int mask, bitmask;
        struct snd_soc_dapm_update update;

        for (bitmask = 1; bitmask < e->max; bitmask <<= 1)
                ;
        if (ucontrol->value.enumerated.item[0] > e->max - 1)
                return -EINVAL;
        mux = ucontrol->value.enumerated.item[0];
        val = mux << e->shift_l;
        mask = (bitmask - 1) << e->shift_l;
        if (e->shift_l != e->shift_r) {
                if (ucontrol->value.enumerated.item[1] > e->max - 1)
                        return -EINVAL;
                val |= ucontrol->value.enumerated.item[1] << e->shift_r;
                mask |= (bitmask - 1) << e->shift_r;
        }

        mutex_lock(&widget->codec->mutex);
        widget->value = val;
        change = snd_soc_test_bits(widget->codec, e->reg, mask, val);

        update.kcontrol = kcontrol;
        update.widget = widget;
        update.reg = e->reg;
        update.mask = mask;
        update.val = val;
        widget->dapm->update = &update;

        dapm_mux_update_power(widget, kcontrol, change, mux, e);

        widget->dapm->update = NULL;

        mutex_unlock(&widget->codec->mutex);
        return change;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_put_enum_double);

/**
 * snd_soc_dapm_get_enum_virt - Get virtual DAPM mux
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Returns 0 for success.
 */
int snd_soc_dapm_get_enum_virt(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_value *ucontrol)
{
        struct snd_soc_dapm_widget *widget = snd_kcontrol_chip(kcontrol);

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

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_get_enum_virt);

/**
 * snd_soc_dapm_put_enum_virt - Set virtual DAPM mux
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Returns 0 for success.
 */
int snd_soc_dapm_put_enum_virt(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_value *ucontrol)
{
        struct snd_soc_dapm_widget *widget = snd_kcontrol_chip(kcontrol);
        struct soc_enum *e =
                (struct soc_enum *)kcontrol->private_value;
        int change;
        int ret = 0;

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

        mutex_lock(&widget->codec->mutex);

        change = widget->value != ucontrol->value.enumerated.item[0];
        widget->value = ucontrol->value.enumerated.item[0];
        dapm_mux_update_power(widget, kcontrol, change, widget->value, e);

        mutex_unlock(&widget->codec->mutex);
        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_put_enum_virt);

/**
 * snd_soc_dapm_get_value_enum_double - dapm semi enumerated double mixer get
 *                                      callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to get the value of a dapm semi enumerated double mixer control.
 *
 * Semi enumerated mixer: the enumerated items are referred as values. Can be
 * used for handling bitfield coded enumeration for example.
 *
 * Returns 0 for success.
 */
int snd_soc_dapm_get_value_enum_double(struct snd_kcontrol *kcontrol,
        struct snd_ctl_elem_value *ucontrol)
{
        struct snd_soc_dapm_widget *widget = snd_kcontrol_chip(kcontrol);
        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
        unsigned int reg_val, val, mux;

        reg_val = snd_soc_read(widget->codec, e->reg);
        val = (reg_val >> e->shift_l) & e->mask;
        for (mux = 0; mux < e->max; mux++) {
                if (val == e->values[mux])
                        break;
        }
        ucontrol->value.enumerated.item[0] = mux;
        if (e->shift_l != e->shift_r) {
                val = (reg_val >> e->shift_r) & e->mask;
                for (mux = 0; mux < e->max; mux++) {
                        if (val == e->values[mux])
                                break;
                }
                ucontrol->value.enumerated.item[1] = mux;
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_get_value_enum_double);

/**
 * snd_soc_dapm_put_value_enum_double - dapm semi enumerated double mixer set
 *                                      callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to set the value of a dapm semi enumerated double mixer control.
 *
 * Semi enumerated mixer: the enumerated items are referred as values. Can be
 * used for handling bitfield coded enumeration for example.
 *
 * Returns 0 for success.
 */
int snd_soc_dapm_put_value_enum_double(struct snd_kcontrol *kcontrol,
        struct snd_ctl_elem_value *ucontrol)
{
        struct snd_soc_dapm_widget *widget = snd_kcontrol_chip(kcontrol);
        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
        unsigned int val, mux, change;
        unsigned int mask;
        struct snd_soc_dapm_update update;

        if (ucontrol->value.enumerated.item[0] > e->max - 1)
                return -EINVAL;
        mux = ucontrol->value.enumerated.item[0];
        val = e->values[ucontrol->value.enumerated.item[0]] << e->shift_l;
        mask = e->mask << e->shift_l;

        if (e->shift_l != e->shift_r) {
                if (ucontrol->value.enumerated.item[1] > e->max - 1)
                        return -EINVAL;
                val |= e->values[ucontrol->value.enumerated.item[1]] << e->shift_r;
                mask |= e->mask << e->shift_r;
        }

        mutex_lock(&widget->codec->mutex);
        widget->value = val;
        change = snd_soc_test_bits(widget->codec, e->reg, mask, val);

        update.kcontrol = kcontrol;
        update.widget = widget;
        update.reg = e->reg;
        update.mask = mask;
        update.val = val;
        widget->dapm->update = &update;

        dapm_mux_update_power(widget, kcontrol, change, mux, e);

        widget->dapm->update = NULL;

        mutex_unlock(&widget->codec->mutex);
        return change;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_put_value_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_codec *codec = snd_kcontrol_chip(kcontrol);
        const char *pin = (const char *)kcontrol->private_value;

        mutex_lock(&codec->mutex);

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

        mutex_unlock(&codec->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_codec *codec = snd_kcontrol_chip(kcontrol);
        const char *pin = (const char *)kcontrol->private_value;

        mutex_lock(&codec->mutex);

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

        snd_soc_dapm_sync(&codec->dapm);

        mutex_unlock(&codec->mutex);

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_put_pin_switch);

/**
 * snd_soc_dapm_new_control - create new dapm control
 * @dapm: DAPM context
 * @widget: widget template
 *
 * Creates a new dapm control based upon the template.
 *
 * Returns 0 for success else error.
 */
int snd_soc_dapm_new_control(struct snd_soc_dapm_context *dapm,
        const struct snd_soc_dapm_widget *widget)
{
        struct snd_soc_dapm_widget *w;
        size_t name_len;

        if ((w = dapm_cnew_widget(widget)) == NULL)
                return -ENOMEM;

        name_len = strlen(widget->name) + 1;
        if (dapm->codec->name_prefix)
                name_len += 1 + strlen(dapm->codec->name_prefix);
        w->name = kmalloc(name_len, GFP_KERNEL);
        if (w->name == NULL) {
                kfree(w);
                return -ENOMEM;
        }
        if (dapm->codec->name_prefix)
                snprintf(w->name, name_len, "%s %s",
                        dapm->codec->name_prefix, widget->name);
        else
                snprintf(w->name, name_len, "%s", widget->name);

        dapm->n_widgets++;
        w->dapm = dapm;
        w->codec = dapm->codec;
        INIT_LIST_HEAD(&w->sources);
        INIT_LIST_HEAD(&w->sinks);
        INIT_LIST_HEAD(&w->list);
        list_add(&w->list, &dapm->card->widgets);

        /* machine layer set ups unconnected pins and insertions */
        w->connected = 1;
        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_new_control);

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

        for (i = 0; i < num; i++) {
                ret = snd_soc_dapm_new_control(dapm, widget);
                if (ret < 0) {
                        dev_err(dapm->dev,
                                "ASoC: Failed to create DAPM control %s: %d\n",
                                widget->name, ret);
                        return ret;
                }
                widget++;
        }
        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_new_controls);

static void soc_dapm_stream_event(struct snd_soc_dapm_context *dapm,
        const char *stream, int event)
{
        struct snd_soc_dapm_widget *w;

        list_for_each_entry(w, &dapm->card->widgets, list)
        {
                if (!w->sname || w->dapm != dapm)
                        continue;
                dev_dbg(w->dapm->dev, "widget %s\n %s stream %s event %d\n",
                        w->name, w->sname, stream, event);
                if (strstr(w->sname, stream)) {
                        switch(event) {
                        case SND_SOC_DAPM_STREAM_START:
                                w->active = 1;
                                break;
                        case SND_SOC_DAPM_STREAM_STOP:
                                w->active = 0;
                                break;
                        case SND_SOC_DAPM_STREAM_SUSPEND:
                        case SND_SOC_DAPM_STREAM_RESUME:
                        case SND_SOC_DAPM_STREAM_PAUSE_PUSH:
                        case SND_SOC_DAPM_STREAM_PAUSE_RELEASE:
                                break;
                        }
                }
        }

        dapm_power_widgets(dapm, 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.
 */
int snd_soc_dapm_stream_event(struct snd_soc_pcm_runtime *rtd,
        const char *stream, int event)
{
        struct snd_soc_codec *codec = rtd->codec;

        if (stream == NULL)
                return 0;

        mutex_lock(&codec->mutex);
        soc_dapm_stream_event(&codec->dapm, stream, event);
        mutex_unlock(&codec->mutex);
        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_stream_event);

/**
 * 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)
{
        return snd_soc_dapm_set_pin(dapm, pin, 1);
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_enable_pin);

/**
 * 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)
{
        struct snd_soc_dapm_widget *w;

        list_for_each_entry(w, &dapm->card->widgets, list) {
                if (w->dapm != dapm)
                        continue;
                if (!strcmp(w->name, pin)) {
                        dev_dbg(w->dapm->dev,
                                "dapm: force enable pin %s\n", pin);
                        w->connected = 1;
                        w->force = 1;
                        return 0;
                }
        }

        dev_err(dapm->dev, "dapm: unknown pin %s\n", pin);
        return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_force_enable_pin);

/**
 * 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)
{
        return snd_soc_dapm_set_pin(dapm, pin, 0);
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_disable_pin);

/**
 * 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)
{
        return snd_soc_dapm_set_pin(dapm, pin, 0);
}
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;

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

        list_for_each_entry(w, &dapm->card->widgets, list) {
                if (w->dapm != dapm)
                        continue;
                if (!strcmp(w->name, pin)) {
                        w->ignore_suspend = 1;
                        return 0;
                }
        }

        dev_err(dapm->dev, "dapm: unknown pin %s\n", pin);
        return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_ignore_suspend);

/**
 * snd_soc_dapm_free - free dapm resources
 * @card: SoC device
 *
 * Free all dapm widgets and resources.
 */
void snd_soc_dapm_free(struct snd_soc_dapm_context *dapm)
{
        snd_soc_dapm_sys_remove(dapm->dev);
        dapm_free_widgets(dapm);
        list_del(&dapm->list);
}
EXPORT_SYMBOL_GPL(snd_soc_dapm_free);

static void soc_dapm_shutdown_codec(struct snd_soc_dapm_context *dapm)
{
        struct snd_soc_dapm_widget *w;
        LIST_HEAD(down_list);
        int powerdown = 0;

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

        /* If there were no widgets to power down we're already in
         * standby.
         */
        if (powerdown) {
                snd_soc_dapm_set_bias_level(NULL, dapm, SND_SOC_BIAS_PREPARE);
                dapm_seq_run(dapm, &down_list, 0, dapm_down_seq);
                snd_soc_dapm_set_bias_level(NULL, dapm, SND_SOC_BIAS_STANDBY);
        }
}

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

        list_for_each_entry(codec, &card->codec_dev_list, list) {
                soc_dapm_shutdown_codec(&codec->dapm);
                snd_soc_dapm_set_bias_level(card, &codec->dapm, SND_SOC_BIAS_OFF);
        }
}

/* Module information */
MODULE_AUTHOR("Liam Girdwood, lrg@slimlogic.co.uk");
MODULE_DESCRIPTION("Dynamic Audio Power Management core for ALSA SoC");
MODULE_LICENSE("GPL");