// SPDX-License-Identifier: GPL-2.0
//
// soc-component.c
//
// Copyright 2009-2011 Wolfson Microelectronics PLC.
// Copyright (C) 2019 Renesas Electronics Corp.
//
// Mark Brown <broonie@opensource.wolfsonmicro.com>
// Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
//
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <sound/soc.h>
#include <linux/bitops.h>

#define soc_component_ret(dai, ret) _soc_component_ret(dai, __func__, ret)
static inline int _soc_component_ret(struct snd_soc_component *component,
                                     const char *func, int ret)
{
        /* Positive/Zero values are not errors */
        if (ret >= 0)
                return ret;

        /* Negative values might be errors */
        switch (ret) {
        case -EPROBE_DEFER:
        case -ENOTSUPP:
                break;
        default:
                dev_err(component->dev,
                        "ASoC: error at %s on %s: %d\n",
                        func, component->name, ret);
        }

        return ret;
}

static inline int soc_component_field_shift(struct snd_soc_component *component,
                                            unsigned int mask)
{
        if (!mask) {
                dev_err(component->dev, "ASoC: error field mask is zero for %s\n",
                        component->name);
                return 0;
        }

        return (ffs(mask) - 1);
}

/*
 * We might want to check substream by using list.
 * In such case, we can update these macros.
 */
#define soc_component_mark_push(component, substream, tgt)      ((component)->mark_##tgt = substream)
#define soc_component_mark_pop(component, substream, tgt)       ((component)->mark_##tgt = NULL)
#define soc_component_mark_match(component, substream, tgt)     ((component)->mark_##tgt == substream)

void snd_soc_component_set_aux(struct snd_soc_component *component,
                               struct snd_soc_aux_dev *aux)
{
        component->init = (aux) ? aux->init : NULL;
}

int snd_soc_component_init(struct snd_soc_component *component)
{
        int ret = 0;

        if (component->init)
                ret = component->init(component);

        return soc_component_ret(component, ret);
}

/**
 * snd_soc_component_set_sysclk - configure COMPONENT system or master clock.
 * @component: COMPONENT
 * @clk_id: DAI specific clock ID
 * @source: Source for the clock
 * @freq: new clock frequency in Hz
 * @dir: new clock direction - input/output.
 *
 * Configures the CODEC master (MCLK) or system (SYSCLK) clocking.
 */
int snd_soc_component_set_sysclk(struct snd_soc_component *component,
                                 int clk_id, int source, unsigned int freq,
                                 int dir)
{
        int ret = -ENOTSUPP;

        if (component->driver->set_sysclk)
                ret = component->driver->set_sysclk(component, clk_id, source,
                                                     freq, dir);

        return soc_component_ret(component, ret);
}
EXPORT_SYMBOL_GPL(snd_soc_component_set_sysclk);

/*
 * snd_soc_component_set_pll - configure component PLL.
 * @component: COMPONENT
 * @pll_id: DAI specific PLL ID
 * @source: DAI specific source for the PLL
 * @freq_in: PLL input clock frequency in Hz
 * @freq_out: requested PLL output clock frequency in Hz
 *
 * Configures and enables PLL to generate output clock based on input clock.
 */
int snd_soc_component_set_pll(struct snd_soc_component *component, int pll_id,
                              int source, unsigned int freq_in,
                              unsigned int freq_out)
{
        int ret = -EINVAL;

        if (component->driver->set_pll)
                ret = component->driver->set_pll(component, pll_id, source,
                                                  freq_in, freq_out);

        return soc_component_ret(component, ret);
}
EXPORT_SYMBOL_GPL(snd_soc_component_set_pll);

void snd_soc_component_seq_notifier(struct snd_soc_component *component,
                                    enum snd_soc_dapm_type type, int subseq)
{
        if (component->driver->seq_notifier)
                component->driver->seq_notifier(component, type, subseq);
}

int snd_soc_component_stream_event(struct snd_soc_component *component,
                                   int event)
{
        int ret = 0;

        if (component->driver->stream_event)
                ret = component->driver->stream_event(component, event);

        return soc_component_ret(component, ret);
}

int snd_soc_component_set_bias_level(struct snd_soc_component *component,
                                     enum snd_soc_bias_level level)
{
        int ret = 0;

        if (component->driver->set_bias_level)
                ret = component->driver->set_bias_level(component, level);

        return soc_component_ret(component, ret);
}

int snd_soc_component_enable_pin(struct snd_soc_component *component,
                                 const char *pin)
{
        struct snd_soc_dapm_context *dapm =
                snd_soc_component_get_dapm(component);
        return snd_soc_dapm_enable_pin(dapm, pin);
}
EXPORT_SYMBOL_GPL(snd_soc_component_enable_pin);

int snd_soc_component_enable_pin_unlocked(struct snd_soc_component *component,
                                          const char *pin)
{
        struct snd_soc_dapm_context *dapm =
                snd_soc_component_get_dapm(component);
        return snd_soc_dapm_enable_pin_unlocked(dapm, pin);
}
EXPORT_SYMBOL_GPL(snd_soc_component_enable_pin_unlocked);

int snd_soc_component_disable_pin(struct snd_soc_component *component,
                                  const char *pin)
{
        struct snd_soc_dapm_context *dapm =
                snd_soc_component_get_dapm(component);
        return snd_soc_dapm_disable_pin(dapm, pin);
}
EXPORT_SYMBOL_GPL(snd_soc_component_disable_pin);

int snd_soc_component_disable_pin_unlocked(struct snd_soc_component *component,
                                           const char *pin)
{
        struct snd_soc_dapm_context *dapm = 
                snd_soc_component_get_dapm(component);
        return snd_soc_dapm_disable_pin_unlocked(dapm, pin);
}
EXPORT_SYMBOL_GPL(snd_soc_component_disable_pin_unlocked);

int snd_soc_component_nc_pin(struct snd_soc_component *component,
                             const char *pin)
{
        struct snd_soc_dapm_context *dapm =
                snd_soc_component_get_dapm(component);
        return snd_soc_dapm_nc_pin(dapm, pin);
}
EXPORT_SYMBOL_GPL(snd_soc_component_nc_pin);

int snd_soc_component_nc_pin_unlocked(struct snd_soc_component *component,
                                      const char *pin)
{
        struct snd_soc_dapm_context *dapm =
                snd_soc_component_get_dapm(component);
        return snd_soc_dapm_nc_pin_unlocked(dapm, pin);
}
EXPORT_SYMBOL_GPL(snd_soc_component_nc_pin_unlocked);

int snd_soc_component_get_pin_status(struct snd_soc_component *component,
                                     const char *pin)
{
        struct snd_soc_dapm_context *dapm =
                snd_soc_component_get_dapm(component);
        return snd_soc_dapm_get_pin_status(dapm, pin);
}
EXPORT_SYMBOL_GPL(snd_soc_component_get_pin_status);

int snd_soc_component_force_enable_pin(struct snd_soc_component *component,
                                       const char *pin)
{
        struct snd_soc_dapm_context *dapm =
                snd_soc_component_get_dapm(component);
        return snd_soc_dapm_force_enable_pin(dapm, pin);
}
EXPORT_SYMBOL_GPL(snd_soc_component_force_enable_pin);

int snd_soc_component_force_enable_pin_unlocked(
        struct snd_soc_component *component,
        const char *pin)
{
        struct snd_soc_dapm_context *dapm =
                snd_soc_component_get_dapm(component);
        return snd_soc_dapm_force_enable_pin_unlocked(dapm, pin);
}
EXPORT_SYMBOL_GPL(snd_soc_component_force_enable_pin_unlocked);

/**
 * snd_soc_component_set_jack - configure component jack.
 * @component: COMPONENTs
 * @jack: structure to use for the jack
 * @data: can be used if codec driver need extra data for configuring jack
 *
 * Configures and enables jack detection function.
 */
int snd_soc_component_set_jack(struct snd_soc_component *component,
                               struct snd_soc_jack *jack, void *data)
{
        int ret = -ENOTSUPP;

        if (component->driver->set_jack)
                ret = component->driver->set_jack(component, jack, data);

        return soc_component_ret(component, ret);
}
EXPORT_SYMBOL_GPL(snd_soc_component_set_jack);

int snd_soc_component_module_get(struct snd_soc_component *component,
                                 struct snd_pcm_substream *substream,
                                 int upon_open)
{
        int ret = 0;

        if (component->driver->module_get_upon_open == !!upon_open &&
            !try_module_get(component->dev->driver->owner))
                ret = -ENODEV;

        /* mark substream if succeeded */
        if (ret == 0)
                soc_component_mark_push(component, substream, module);

        return soc_component_ret(component, ret);
}

void snd_soc_component_module_put(struct snd_soc_component *component,
                                  struct snd_pcm_substream *substream,
                                  int upon_open, int rollback)
{
        if (rollback && !soc_component_mark_match(component, substream, module))
                return;

        if (component->driver->module_get_upon_open == !!upon_open)
                module_put(component->dev->driver->owner);

        /* remove marked substream */
        soc_component_mark_pop(component, substream, module);
}

int snd_soc_component_open(struct snd_soc_component *component,
                           struct snd_pcm_substream *substream)
{
        int ret = 0;

        if (component->driver->open)
                ret = component->driver->open(component, substream);

        /* mark substream if succeeded */
        if (ret == 0)
                soc_component_mark_push(component, substream, open);

        return soc_component_ret(component, ret);
}

int snd_soc_component_close(struct snd_soc_component *component,
                            struct snd_pcm_substream *substream,
                            int rollback)
{
        int ret = 0;

        if (rollback && !soc_component_mark_match(component, substream, open))
                return 0;

        if (component->driver->close)
                ret = component->driver->close(component, substream);

        /* remove marked substream */
        soc_component_mark_pop(component, substream, open);

        return soc_component_ret(component, ret);
}

void snd_soc_component_suspend(struct snd_soc_component *component)
{
        if (component->driver->suspend)
                component->driver->suspend(component);
        component->suspended = 1;
}

void snd_soc_component_resume(struct snd_soc_component *component)
{
        if (component->driver->resume)
                component->driver->resume(component);
        component->suspended = 0;
}

int snd_soc_component_is_suspended(struct snd_soc_component *component)
{
        return component->suspended;
}

int snd_soc_component_probe(struct snd_soc_component *component)
{
        int ret = 0;

        if (component->driver->probe)
                ret = component->driver->probe(component);

        return soc_component_ret(component, ret);
}

void snd_soc_component_remove(struct snd_soc_component *component)
{
        if (component->driver->remove)
                component->driver->remove(component);
}

int snd_soc_component_of_xlate_dai_id(struct snd_soc_component *component,
                                      struct device_node *ep)
{
        int ret = -ENOTSUPP;

        if (component->driver->of_xlate_dai_id)
                ret = component->driver->of_xlate_dai_id(component, ep);

        return soc_component_ret(component, ret);
}

int snd_soc_component_of_xlate_dai_name(struct snd_soc_component *component,
                                        const struct of_phandle_args *args,
                                        const char **dai_name)
{
        if (component->driver->of_xlate_dai_name)
                return component->driver->of_xlate_dai_name(component,
                                                            args, dai_name);
        /*
         * Don't use soc_component_ret here because we may not want to report
         * the error just yet. If a device has more than one component, the
         * first may not match and we don't want spam the log with this.
         */
        return -ENOTSUPP;
}

void snd_soc_component_setup_regmap(struct snd_soc_component *component)
{
        int val_bytes = regmap_get_val_bytes(component->regmap);

        /* Errors are legitimate for non-integer byte multiples */
        if (val_bytes > 0)
                component->val_bytes = val_bytes;
}

#ifdef CONFIG_REGMAP

/**
 * snd_soc_component_init_regmap() - Initialize regmap instance for the
 *                                   component
 * @component: The component for which to initialize the regmap instance
 * @regmap: The regmap instance that should be used by the component
 *
 * This function allows deferred assignment of the regmap instance that is
 * associated with the component. Only use this if the regmap instance is not
 * yet ready when the component is registered. The function must also be called
 * before the first IO attempt of the component.
 */
void snd_soc_component_init_regmap(struct snd_soc_component *component,
                                   struct regmap *regmap)
{
        component->regmap = regmap;
        snd_soc_component_setup_regmap(component);
}
EXPORT_SYMBOL_GPL(snd_soc_component_init_regmap);

/**
 * snd_soc_component_exit_regmap() - De-initialize regmap instance for the
 *                                   component
 * @component: The component for which to de-initialize the regmap instance
 *
 * Calls regmap_exit() on the regmap instance associated to the component and
 * removes the regmap instance from the component.
 *
 * This function should only be used if snd_soc_component_init_regmap() was used
 * to initialize the regmap instance.
 */
void snd_soc_component_exit_regmap(struct snd_soc_component *component)
{
        regmap_exit(component->regmap);
        component->regmap = NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_component_exit_regmap);

#endif

int snd_soc_component_compr_open(struct snd_compr_stream *cstream)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_component *component;
        int i, ret;

        for_each_rtd_components(rtd, i, component) {
                if (component->driver->compress_ops &&
                    component->driver->compress_ops->open) {
                        ret = component->driver->compress_ops->open(component, cstream);
                        if (ret < 0)
                                return soc_component_ret(component, ret);
                }
                soc_component_mark_push(component, cstream, compr_open);
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_component_compr_open);

void snd_soc_component_compr_free(struct snd_compr_stream *cstream,
                                  int rollback)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_component *component;
        int i;

        for_each_rtd_components(rtd, i, component) {
                if (rollback && !soc_component_mark_match(component, cstream, compr_open))
                        continue;

                if (component->driver->compress_ops &&
                    component->driver->compress_ops->free)
                        component->driver->compress_ops->free(component, cstream);

                soc_component_mark_pop(component, cstream, compr_open);
        }
}
EXPORT_SYMBOL_GPL(snd_soc_component_compr_free);

int snd_soc_component_compr_trigger(struct snd_compr_stream *cstream, int cmd)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_component *component;
        int i, ret;

        for_each_rtd_components(rtd, i, component) {
                if (component->driver->compress_ops &&
                    component->driver->compress_ops->trigger) {
                        ret = component->driver->compress_ops->trigger(
                                component, cstream, cmd);
                        if (ret < 0)
                                return soc_component_ret(component, ret);
                }
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_component_compr_trigger);

int snd_soc_component_compr_set_params(struct snd_compr_stream *cstream,
                                       struct snd_compr_params *params)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_component *component;
        int i, ret;

        for_each_rtd_components(rtd, i, component) {
                if (component->driver->compress_ops &&
                    component->driver->compress_ops->set_params) {
                        ret = component->driver->compress_ops->set_params(
                                component, cstream, params);
                        if (ret < 0)
                                return soc_component_ret(component, ret);
                }
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_component_compr_set_params);

int snd_soc_component_compr_get_params(struct snd_compr_stream *cstream,
                                       struct snd_codec *params)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_component *component;
        int i, ret;

        for_each_rtd_components(rtd, i, component) {
                if (component->driver->compress_ops &&
                    component->driver->compress_ops->get_params) {
                        ret = component->driver->compress_ops->get_params(
                                component, cstream, params);
                        return soc_component_ret(component, ret);
                }
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_component_compr_get_params);

int snd_soc_component_compr_get_caps(struct snd_compr_stream *cstream,
                                     struct snd_compr_caps *caps)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_component *component;
        int i, ret = 0;

        mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);

        for_each_rtd_components(rtd, i, component) {
                if (component->driver->compress_ops &&
                    component->driver->compress_ops->get_caps) {
                        ret = component->driver->compress_ops->get_caps(
                                component, cstream, caps);
                        break;
                }
        }

        mutex_unlock(&rtd->card->pcm_mutex);

        return soc_component_ret(component, ret);
}
EXPORT_SYMBOL_GPL(snd_soc_component_compr_get_caps);

int snd_soc_component_compr_get_codec_caps(struct snd_compr_stream *cstream,
                                           struct snd_compr_codec_caps *codec)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_component *component;
        int i, ret = 0;

        mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);

        for_each_rtd_components(rtd, i, component) {
                if (component->driver->compress_ops &&
                    component->driver->compress_ops->get_codec_caps) {
                        ret = component->driver->compress_ops->get_codec_caps(
                                component, cstream, codec);
                        break;
                }
        }

        mutex_unlock(&rtd->card->pcm_mutex);

        return soc_component_ret(component, ret);
}
EXPORT_SYMBOL_GPL(snd_soc_component_compr_get_codec_caps);

int snd_soc_component_compr_ack(struct snd_compr_stream *cstream, size_t bytes)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_component *component;
        int i, ret;

        for_each_rtd_components(rtd, i, component) {
                if (component->driver->compress_ops &&
                    component->driver->compress_ops->ack) {
                        ret = component->driver->compress_ops->ack(
                                component, cstream, bytes);
                        if (ret < 0)
                                return soc_component_ret(component, ret);
                }
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_component_compr_ack);

int snd_soc_component_compr_pointer(struct snd_compr_stream *cstream,
                                    struct snd_compr_tstamp *tstamp)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_component *component;
        int i, ret;

        for_each_rtd_components(rtd, i, component) {
                if (component->driver->compress_ops &&
                    component->driver->compress_ops->pointer) {
                        ret = component->driver->compress_ops->pointer(
                                component, cstream, tstamp);
                        return soc_component_ret(component, ret);
                }
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_component_compr_pointer);

int snd_soc_component_compr_copy(struct snd_compr_stream *cstream,
                                 char __user *buf, size_t count)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_component *component;
        int i, ret = 0;

        mutex_lock_nested(&rtd->card->pcm_mutex, rtd->card->pcm_subclass);

        for_each_rtd_components(rtd, i, component) {
                if (component->driver->compress_ops &&
                    component->driver->compress_ops->copy) {
                        ret = component->driver->compress_ops->copy(
                                component, cstream, buf, count);
                        break;
                }
        }

        mutex_unlock(&rtd->card->pcm_mutex);

        return soc_component_ret(component, ret);
}
EXPORT_SYMBOL_GPL(snd_soc_component_compr_copy);

int snd_soc_component_compr_set_metadata(struct snd_compr_stream *cstream,
                                         struct snd_compr_metadata *metadata)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_component *component;
        int i, ret;

        for_each_rtd_components(rtd, i, component) {
                if (component->driver->compress_ops &&
                    component->driver->compress_ops->set_metadata) {
                        ret = component->driver->compress_ops->set_metadata(
                                component, cstream, metadata);
                        if (ret < 0)
                                return soc_component_ret(component, ret);
                }
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_component_compr_set_metadata);

int snd_soc_component_compr_get_metadata(struct snd_compr_stream *cstream,
                                         struct snd_compr_metadata *metadata)
{
        struct snd_soc_pcm_runtime *rtd = cstream->private_data;
        struct snd_soc_component *component;
        int i, ret;

        for_each_rtd_components(rtd, i, component) {
                if (component->driver->compress_ops &&
                    component->driver->compress_ops->get_metadata) {
                        ret = component->driver->compress_ops->get_metadata(
                                component, cstream, metadata);
                        return soc_component_ret(component, ret);
                }
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_component_compr_get_metadata);

static unsigned int soc_component_read_no_lock(
        struct snd_soc_component *component,
        unsigned int reg)
{
        int ret;
        unsigned int val = 0;

        if (component->regmap)
                ret = regmap_read(component->regmap, reg, &val);
        else if (component->driver->read) {
                ret = 0;
                val = component->driver->read(component, reg);
        }
        else
                ret = -EIO;

        if (ret < 0)
                return soc_component_ret(component, ret);

        return val;
}

/**
 * snd_soc_component_read() - Read register value
 * @component: Component to read from
 * @reg: Register to read
 *
 * Return: read value
 */
unsigned int snd_soc_component_read(struct snd_soc_component *component,
                                    unsigned int reg)
{
        unsigned int val;

        mutex_lock(&component->io_mutex);
        val = soc_component_read_no_lock(component, reg);
        mutex_unlock(&component->io_mutex);

        return val;
}
EXPORT_SYMBOL_GPL(snd_soc_component_read);

static int soc_component_write_no_lock(
        struct snd_soc_component *component,
        unsigned int reg, unsigned int val)
{
        int ret = -EIO;

        if (component->regmap)
                ret = regmap_write(component->regmap, reg, val);
        else if (component->driver->write)
                ret = component->driver->write(component, reg, val);

        return soc_component_ret(component, ret);
}

/**
 * snd_soc_component_write() - Write register value
 * @component: Component to write to
 * @reg: Register to write
 * @val: Value to write to the register
 *
 * Return: 0 on success, a negative error code otherwise.
 */
int snd_soc_component_write(struct snd_soc_component *component,
                            unsigned int reg, unsigned int val)
{
        int ret;

        mutex_lock(&component->io_mutex);
        ret = soc_component_write_no_lock(component, reg, val);
        mutex_unlock(&component->io_mutex);

        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_component_write);

static int snd_soc_component_update_bits_legacy(
        struct snd_soc_component *component, unsigned int reg,
        unsigned int mask, unsigned int val, bool *change)
{
        unsigned int old, new;
        int ret = 0;

        mutex_lock(&component->io_mutex);

        old = soc_component_read_no_lock(component, reg);

        new = (old & ~mask) | (val & mask);
        *change = old != new;
        if (*change)
                ret = soc_component_write_no_lock(component, reg, new);

        mutex_unlock(&component->io_mutex);

        return soc_component_ret(component, ret);
}

/**
 * snd_soc_component_update_bits() - Perform read/modify/write cycle
 * @component: Component to update
 * @reg: Register to update
 * @mask: Mask that specifies which bits to update
 * @val: New value for the bits specified by mask
 *
 * Return: 1 if the operation was successful and the value of the register
 * changed, 0 if the operation was successful, but the value did not change.
 * Returns a negative error code otherwise.
 */
int snd_soc_component_update_bits(struct snd_soc_component *component,
                                  unsigned int reg, unsigned int mask, unsigned int val)
{
        bool change;
        int ret;

        if (component->regmap)
                ret = regmap_update_bits_check(component->regmap, reg, mask,
                                               val, &change);
        else
                ret = snd_soc_component_update_bits_legacy(component, reg,
                                                           mask, val, &change);

        if (ret < 0)
                return soc_component_ret(component, ret);
        return change;
}
EXPORT_SYMBOL_GPL(snd_soc_component_update_bits);

/**
 * snd_soc_component_update_bits_async() - Perform asynchronous
 *  read/modify/write cycle
 * @component: Component to update
 * @reg: Register to update
 * @mask: Mask that specifies which bits to update
 * @val: New value for the bits specified by mask
 *
 * This function is similar to snd_soc_component_update_bits(), but the update
 * operation is scheduled asynchronously. This means it may not be completed
 * when the function returns. To make sure that all scheduled updates have been
 * completed snd_soc_component_async_complete() must be called.
 *
 * Return: 1 if the operation was successful and the value of the register
 * changed, 0 if the operation was successful, but the value did not change.
 * Returns a negative error code otherwise.
 */
int snd_soc_component_update_bits_async(struct snd_soc_component *component,
                                        unsigned int reg, unsigned int mask, unsigned int val)
{
        bool change;
        int ret;

        if (component->regmap)
                ret = regmap_update_bits_check_async(component->regmap, reg,
                                                     mask, val, &change);
        else
                ret = snd_soc_component_update_bits_legacy(component, reg,
                                                           mask, val, &change);

        if (ret < 0)
                return soc_component_ret(component, ret);
        return change;
}
EXPORT_SYMBOL_GPL(snd_soc_component_update_bits_async);

/**
 * snd_soc_component_read_field() - Read register field value
 * @component: Component to read from
 * @reg: Register to read
 * @mask: mask of the register field
 *
 * Return: read value of register field.
 */
unsigned int snd_soc_component_read_field(struct snd_soc_component *component,
                                          unsigned int reg, unsigned int mask)
{
        unsigned int val;

        val = snd_soc_component_read(component, reg);

        val = (val & mask) >> soc_component_field_shift(component, mask);

        return val;
}
EXPORT_SYMBOL_GPL(snd_soc_component_read_field);

/**
 * snd_soc_component_write_field() - write to register field
 * @component: Component to write to
 * @reg: Register to write
 * @mask: mask of the register field to update
 * @val: value of the field to write
 *
 * Return: 1 for change, otherwise 0.
 */
int snd_soc_component_write_field(struct snd_soc_component *component,
                                  unsigned int reg, unsigned int mask,
                                  unsigned int val)
{

        val = (val << soc_component_field_shift(component, mask)) & mask;

        return snd_soc_component_update_bits(component, reg, mask, val);
}
EXPORT_SYMBOL_GPL(snd_soc_component_write_field);

/**
 * snd_soc_component_async_complete() - Ensure asynchronous I/O has completed
 * @component: Component for which to wait
 *
 * This function blocks until all asynchronous I/O which has previously been
 * scheduled using snd_soc_component_update_bits_async() has completed.
 */
void snd_soc_component_async_complete(struct snd_soc_component *component)
{
        if (component->regmap)
                regmap_async_complete(component->regmap);
}
EXPORT_SYMBOL_GPL(snd_soc_component_async_complete);

/**
 * snd_soc_component_test_bits - Test register for change
 * @component: component
 * @reg: Register to test
 * @mask: Mask that specifies which bits to test
 * @value: Value to test against
 *
 * Tests a register with a new value and checks if the new value is
 * different from the old value.
 *
 * Return: 1 for change, otherwise 0.
 */
int snd_soc_component_test_bits(struct snd_soc_component *component,
                                unsigned int reg, unsigned int mask, unsigned int value)
{
        unsigned int old, new;

        old = snd_soc_component_read(component, reg);
        new = (old & ~mask) | value;
        return old != new;
}
EXPORT_SYMBOL_GPL(snd_soc_component_test_bits);

int snd_soc_pcm_component_pointer(struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_soc_component *component;
        int i;

        /* FIXME: use 1st pointer */
        for_each_rtd_components(rtd, i, component)
                if (component->driver->pointer)
                        return component->driver->pointer(component, substream);

        return 0;
}

int snd_soc_pcm_component_ioctl(struct snd_pcm_substream *substream,
                                unsigned int cmd, void *arg)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_soc_component *component;
        int i;

        /* FIXME: use 1st ioctl */
        for_each_rtd_components(rtd, i, component)
                if (component->driver->ioctl)
                        return soc_component_ret(
                                component,
                                component->driver->ioctl(component,
                                                         substream, cmd, arg));

        return snd_pcm_lib_ioctl(substream, cmd, arg);
}

int snd_soc_pcm_component_sync_stop(struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_soc_component *component;
        int i, ret;

        for_each_rtd_components(rtd, i, component) {
                if (component->driver->sync_stop) {
                        ret = component->driver->sync_stop(component,
                                                           substream);
                        if (ret < 0)
                                return soc_component_ret(component, ret);
                }
        }

        return 0;
}

int snd_soc_pcm_component_copy_user(struct snd_pcm_substream *substream,
                                    int channel, unsigned long pos,
                                    void __user *buf, unsigned long bytes)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_soc_component *component;
        int i;

        /* FIXME. it returns 1st copy now */
        for_each_rtd_components(rtd, i, component)
                if (component->driver->copy_user)
                        return soc_component_ret(
                                component,
                                component->driver->copy_user(
                                        component, substream, channel,
                                        pos, buf, bytes));

        return -EINVAL;
}

struct page *snd_soc_pcm_component_page(struct snd_pcm_substream *substream,
                                        unsigned long offset)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_soc_component *component;
        struct page *page;
        int i;

        /* FIXME. it returns 1st page now */
        for_each_rtd_components(rtd, i, component) {
                if (component->driver->page) {
                        page = component->driver->page(component,
                                                       substream, offset);
                        if (page)
                                return page;
                }
        }

        return NULL;
}

int snd_soc_pcm_component_mmap(struct snd_pcm_substream *substream,
                               struct vm_area_struct *vma)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_soc_component *component;
        int i;

        /* FIXME. it returns 1st mmap now */
        for_each_rtd_components(rtd, i, component)
                if (component->driver->mmap)
                        return soc_component_ret(
                                component,
                                component->driver->mmap(component,
                                                        substream, vma));

        return -EINVAL;
}

int snd_soc_pcm_component_new(struct snd_soc_pcm_runtime *rtd)
{
        struct snd_soc_component *component;
        int ret;
        int i;

        for_each_rtd_components(rtd, i, component) {
                if (component->driver->pcm_construct) {
                        ret = component->driver->pcm_construct(component, rtd);
                        if (ret < 0)
                                return soc_component_ret(component, ret);
                }
        }

        return 0;
}

void snd_soc_pcm_component_free(struct snd_soc_pcm_runtime *rtd)
{
        struct snd_soc_component *component;
        int i;

        if (!rtd->pcm)
                return;

        for_each_rtd_components(rtd, i, component)
                if (component->driver->pcm_destruct)
                        component->driver->pcm_destruct(component, rtd->pcm);
}

int snd_soc_pcm_component_prepare(struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_soc_component *component;
        int i, ret;

        for_each_rtd_components(rtd, i, component) {
                if (component->driver->prepare) {
                        ret = component->driver->prepare(component, substream);
                        if (ret < 0)
                                return soc_component_ret(component, ret);
                }
        }

        return 0;
}

int snd_soc_pcm_component_hw_params(struct snd_pcm_substream *substream,
                                    struct snd_pcm_hw_params *params)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_soc_component *component;
        int i, ret;

        for_each_rtd_components(rtd, i, component) {
                if (component->driver->hw_params) {
                        ret = component->driver->hw_params(component,
                                                           substream, params);
                        if (ret < 0)
                                return soc_component_ret(component, ret);
                }
                /* mark substream if succeeded */
                soc_component_mark_push(component, substream, hw_params);
        }

        return 0;
}

void snd_soc_pcm_component_hw_free(struct snd_pcm_substream *substream,
                                   int rollback)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_soc_component *component;
        int i, ret;

        for_each_rtd_components(rtd, i, component) {
                if (rollback && !soc_component_mark_match(component, substream, hw_params))
                        continue;

                if (component->driver->hw_free) {
                        ret = component->driver->hw_free(component, substream);
                        if (ret < 0)
                                soc_component_ret(component, ret);
                }

                /* remove marked substream */
                soc_component_mark_pop(component, substream, hw_params);
        }
}

static int soc_component_trigger(struct snd_soc_component *component,
                                 struct snd_pcm_substream *substream,
                                 int cmd)
{
        int ret = 0;

        if (component->driver->trigger)
                ret = component->driver->trigger(component, substream, cmd);

        return soc_component_ret(component, ret);
}

int snd_soc_pcm_component_trigger(struct snd_pcm_substream *substream,
                                  int cmd, int rollback)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_soc_component *component;
        int i, r, ret = 0;

        switch (cmd) {
        case SNDRV_PCM_TRIGGER_START:
        case SNDRV_PCM_TRIGGER_RESUME:
        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
                for_each_rtd_components(rtd, i, component) {
                        ret = soc_component_trigger(component, substream, cmd);
                        if (ret < 0)
                                break;
                        soc_component_mark_push(component, substream, trigger);
                }
                break;
        case SNDRV_PCM_TRIGGER_STOP:
        case SNDRV_PCM_TRIGGER_SUSPEND:
        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
                for_each_rtd_components(rtd, i, component) {
                        if (rollback && !soc_component_mark_match(component, substream, trigger))
                                continue;

                        r = soc_component_trigger(component, substream, cmd);
                        if (r < 0)
                                ret = r; /* use last ret */
                        soc_component_mark_pop(component, substream, trigger);
                }
        }

        return ret;
}

int snd_soc_pcm_component_pm_runtime_get(struct snd_soc_pcm_runtime *rtd,
                                         void *stream)
{
        struct snd_soc_component *component;
        int i;

        for_each_rtd_components(rtd, i, component) {
                int ret = pm_runtime_get_sync(component->dev);
                if (ret < 0 && ret != -EACCES) {
                        pm_runtime_put_noidle(component->dev);
                        return soc_component_ret(component, ret);
                }
                /* mark stream if succeeded */
                soc_component_mark_push(component, stream, pm);
        }

        return 0;
}

void snd_soc_pcm_component_pm_runtime_put(struct snd_soc_pcm_runtime *rtd,
                                          void *stream, int rollback)
{
        struct snd_soc_component *component;
        int i;

        for_each_rtd_components(rtd, i, component) {
                if (rollback && !soc_component_mark_match(component, stream, pm))
                        continue;

                pm_runtime_mark_last_busy(component->dev);
                pm_runtime_put_autosuspend(component->dev);

                /* remove marked stream */
                soc_component_mark_pop(component, stream, pm);
        }
}

int snd_soc_pcm_component_ack(struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
        struct snd_soc_component *component;
        int i;

        /* FIXME: use 1st pointer */
        for_each_rtd_components(rtd, i, component)
                if (component->driver->ack)
                        return component->driver->ack(component, substream);

        return 0;
}