// SPDX-License-Identifier: GPL-2.0+
//
// soc-ops.c  --  Generic ASoC operations
//
// Copyright 2005 Wolfson Microelectronics PLC.
// Copyright 2005 Openedhand Ltd.
// Copyright (C) 2010 Slimlogic Ltd.
// Copyright (C) 2010 Texas Instruments Inc.
//
// Author: Liam Girdwood <lrg@slimlogic.co.uk>
//         with code, comments and ideas from :-
//         Richard Purdie <richard@openedhand.com>

#include <linux/cleanup.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/pm.h>
#include <linux/bitops.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/jack.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>

/**
 * snd_soc_info_enum_double - enumerated double mixer info callback
 * @kcontrol: mixer control
 * @uinfo: control element information
 *
 * Callback to provide information about a double enumerated
 * mixer control.
 *
 * Returns 0 for success.
 */
int snd_soc_info_enum_double(struct snd_kcontrol *kcontrol,
                             struct snd_ctl_elem_info *uinfo)
{
        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;

        return snd_ctl_enum_info(uinfo, e->shift_l == e->shift_r ? 1 : 2,
                                 e->items, e->texts);
}
EXPORT_SYMBOL_GPL(snd_soc_info_enum_double);

/**
 * snd_soc_get_enum_double - enumerated double mixer get callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to get the value of a double enumerated mixer.
 *
 * Returns 0 for success.
 */
int snd_soc_get_enum_double(struct snd_kcontrol *kcontrol,
                            struct snd_ctl_elem_value *ucontrol)
{
        struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
        unsigned int val, item;
        unsigned int reg_val;

        reg_val = snd_soc_component_read(component, e->reg);
        val = (reg_val >> e->shift_l) & e->mask;
        item = snd_soc_enum_val_to_item(e, val);
        ucontrol->value.enumerated.item[0] = item;
        if (e->shift_l != e->shift_r) {
                val = (reg_val >> e->shift_r) & e->mask;
                item = snd_soc_enum_val_to_item(e, val);
                ucontrol->value.enumerated.item[1] = item;
        }

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_get_enum_double);

/**
 * snd_soc_put_enum_double - enumerated double mixer put callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to set the value of a double enumerated mixer.
 *
 * Returns 0 for success.
 */
int snd_soc_put_enum_double(struct snd_kcontrol *kcontrol,
                            struct snd_ctl_elem_value *ucontrol)
{
        struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
        unsigned int *item = ucontrol->value.enumerated.item;
        unsigned int val;
        unsigned int mask;

        if (item[0] >= e->items)
                return -EINVAL;
        val = snd_soc_enum_item_to_val(e, item[0]) << e->shift_l;
        mask = e->mask << e->shift_l;
        if (e->shift_l != e->shift_r) {
                if (item[1] >= e->items)
                        return -EINVAL;
                val |= snd_soc_enum_item_to_val(e, item[1]) << e->shift_r;
                mask |= e->mask << e->shift_r;
        }

        return snd_soc_component_update_bits(component, e->reg, mask, val);
}
EXPORT_SYMBOL_GPL(snd_soc_put_enum_double);

static int soc_mixer_reg_to_ctl(struct soc_mixer_control *mc, unsigned int reg_val,
                                unsigned int mask, unsigned int shift, int max)
{
        int val = (reg_val >> shift) & mask;

        if (mc->sign_bit)
                val = sign_extend32(val, mc->sign_bit);

        val -= mc->min;

        if (mc->invert)
                val = max - val;

        return val & mask;
}

static unsigned int soc_mixer_ctl_to_reg(struct soc_mixer_control *mc, int val,
                                         unsigned int mask, unsigned int shift,
                                         int max)
{
        unsigned int reg_val;

        if (mc->invert)
                val = max - val;

        reg_val = val + mc->min;

        return (reg_val & mask) << shift;
}

static int soc_mixer_valid_ctl(struct soc_mixer_control *mc, long val, int max)
{
        if (val < 0)
                return -EINVAL;

        if (mc->platform_max && val > mc->platform_max)
                return -EINVAL;

        if (val > max)
                return -EINVAL;

        return 0;
}

static int soc_mixer_mask(struct soc_mixer_control *mc)
{
        if (mc->sign_bit)
                return GENMASK(mc->sign_bit, 0);
        else
                return GENMASK(fls(mc->max) - 1, 0);
}

static int soc_mixer_sx_mask(struct soc_mixer_control *mc)
{
        // min + max will take us 1-bit over the size of the mask
        return GENMASK(fls(mc->min + mc->max) - 2, 0);
}

static int soc_info_volsw(struct snd_kcontrol *kcontrol,
                          struct snd_ctl_elem_info *uinfo,
                          struct soc_mixer_control *mc, int max)
{
        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;

        if (max == 1) {
                /* Even two value controls ending in Volume should be integer */
                const char *vol_string = strstr(kcontrol->id.name, " Volume");

                if (!vol_string || strcmp(vol_string, " Volume"))
                        uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
        }

        if (mc->platform_max && mc->platform_max < max)
                max = mc->platform_max;

        uinfo->count = snd_soc_volsw_is_stereo(mc) ? 2 : 1;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = max;

        return 0;
}

static int soc_put_volsw(struct snd_kcontrol *kcontrol,
                         struct snd_ctl_elem_value *ucontrol,
                         struct soc_mixer_control *mc, int mask, int max)
{
        struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
        unsigned int val1, val_mask;
        unsigned int val2 = 0;
        bool double_r = false;
        int ret;

        ret = soc_mixer_valid_ctl(mc, ucontrol->value.integer.value[0], max);
        if (ret)
                return ret;

        val1 = soc_mixer_ctl_to_reg(mc, ucontrol->value.integer.value[0],
                                    mask, mc->shift, max);
        val_mask = mask << mc->shift;

        if (snd_soc_volsw_is_stereo(mc)) {
                ret = soc_mixer_valid_ctl(mc, ucontrol->value.integer.value[1], max);
                if (ret)
                        return ret;

                if (mc->reg == mc->rreg) {
                        val1 |= soc_mixer_ctl_to_reg(mc,
                                                     ucontrol->value.integer.value[1],
                                                     mask, mc->rshift, max);
                        val_mask |= mask << mc->rshift;
                } else {
                        val2 = soc_mixer_ctl_to_reg(mc,
                                                    ucontrol->value.integer.value[1],
                                                    mask, mc->shift, max);
                        double_r = true;
                }
        }

        ret = snd_soc_component_update_bits(component, mc->reg, val_mask, val1);
        if (ret < 0)
                return ret;

        if (double_r) {
                int err = snd_soc_component_update_bits(component, mc->rreg,
                                                        val_mask, val2);
                /* Don't drop change flag */
                if (err)
                        return err;
        }

        return ret;
}

static int soc_get_volsw(struct snd_kcontrol *kcontrol,
                         struct snd_ctl_elem_value *ucontrol,
                         struct soc_mixer_control *mc, int mask, int max)
{
        struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
        unsigned int reg_val;
        int val;

        reg_val = snd_soc_component_read(component, mc->reg);
        val = soc_mixer_reg_to_ctl(mc, reg_val, mask, mc->shift, max);

        ucontrol->value.integer.value[0] = val;

        if (snd_soc_volsw_is_stereo(mc)) {
                if (mc->reg == mc->rreg) {
                        val = soc_mixer_reg_to_ctl(mc, reg_val, mask, mc->rshift, max);
                } else {
                        reg_val = snd_soc_component_read(component, mc->rreg);
                        val = soc_mixer_reg_to_ctl(mc, reg_val, mask, mc->shift, max);
                }

                ucontrol->value.integer.value[1] = val;
        }

        return 0;
}

/**
 * snd_soc_info_volsw - single mixer info callback with range.
 * @kcontrol: mixer control
 * @uinfo: control element information
 *
 * Callback to provide information, with a range, about a single mixer control,
 * or a double mixer control that spans 2 registers.
 *
 * Returns 0 for success.
 */
int snd_soc_info_volsw(struct snd_kcontrol *kcontrol,
                       struct snd_ctl_elem_info *uinfo)
{
        struct soc_mixer_control *mc =
                (struct soc_mixer_control *)kcontrol->private_value;

        return soc_info_volsw(kcontrol, uinfo, mc, mc->max - mc->min);
}
EXPORT_SYMBOL_GPL(snd_soc_info_volsw);

/**
 * snd_soc_info_volsw_sx - Mixer info callback for SX TLV controls
 * @kcontrol: mixer control
 * @uinfo: control element information
 *
 * Callback to provide information about a single mixer control, or a double
 * mixer control that spans 2 registers of the SX TLV type. SX TLV controls
 * have a range that represents both positive and negative values either side
 * of zero but without a sign bit. min is the minimum register value, max is
 * the number of steps.
 *
 * Returns 0 for success.
 */
int snd_soc_info_volsw_sx(struct snd_kcontrol *kcontrol,
                          struct snd_ctl_elem_info *uinfo)
{
        struct soc_mixer_control *mc =
                (struct soc_mixer_control *)kcontrol->private_value;

        return soc_info_volsw(kcontrol, uinfo, mc, mc->max);
}
EXPORT_SYMBOL_GPL(snd_soc_info_volsw_sx);

/**
 * snd_soc_get_volsw - single mixer get callback with range
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to get the value, within a range, of a single mixer control, or a
 * double mixer control that spans 2 registers.
 *
 * Returns 0 for success.
 */
int snd_soc_get_volsw(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_value *ucontrol)
{
        struct soc_mixer_control *mc =
                (struct soc_mixer_control *)kcontrol->private_value;
        unsigned int mask = soc_mixer_mask(mc);

        return soc_get_volsw(kcontrol, ucontrol, mc, mask, mc->max - mc->min);
}
EXPORT_SYMBOL_GPL(snd_soc_get_volsw);

/**
 * snd_soc_put_volsw - single mixer put callback with range
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to set the value , within a range, of a single mixer control, or
 * a double mixer control that spans 2 registers.
 *
 * Returns 0 for success.
 */
int snd_soc_put_volsw(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_value *ucontrol)
{
        struct soc_mixer_control *mc =
                (struct soc_mixer_control *)kcontrol->private_value;
        unsigned int mask = soc_mixer_mask(mc);

        return soc_put_volsw(kcontrol, ucontrol, mc, mask, mc->max - mc->min);
}
EXPORT_SYMBOL_GPL(snd_soc_put_volsw);

/**
 * snd_soc_get_volsw_sx - single mixer get callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to get the value of a single mixer control, or a double mixer
 * control that spans 2 registers.
 *
 * Returns 0 for success.
 */
int snd_soc_get_volsw_sx(struct snd_kcontrol *kcontrol,
                         struct snd_ctl_elem_value *ucontrol)
{
        struct soc_mixer_control *mc =
                (struct soc_mixer_control *)kcontrol->private_value;
        unsigned int mask = soc_mixer_sx_mask(mc);

        return soc_get_volsw(kcontrol, ucontrol, mc, mask, mc->max);
}
EXPORT_SYMBOL_GPL(snd_soc_get_volsw_sx);

/**
 * snd_soc_put_volsw_sx - double mixer set callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback to set the value of a double mixer control that spans 2 registers.
 *
 * Returns 0 for success.
 */
int snd_soc_put_volsw_sx(struct snd_kcontrol *kcontrol,
                         struct snd_ctl_elem_value *ucontrol)
{
        struct soc_mixer_control *mc =
                (struct soc_mixer_control *)kcontrol->private_value;
        unsigned int mask = soc_mixer_sx_mask(mc);

        return soc_put_volsw(kcontrol, ucontrol, mc, mask, mc->max);
}
EXPORT_SYMBOL_GPL(snd_soc_put_volsw_sx);

static int snd_soc_clip_to_platform_max(struct snd_kcontrol *kctl)
{
        struct soc_mixer_control *mc = (struct soc_mixer_control *)kctl->private_value;
        struct snd_ctl_elem_value *uctl;
        int ret;

        if (!mc->platform_max)
                return 0;

        uctl = kzalloc(sizeof(*uctl), GFP_KERNEL);
        if (!uctl)
                return -ENOMEM;

        ret = kctl->get(kctl, uctl);
        if (ret < 0)
                goto out;

        if (uctl->value.integer.value[0] > mc->platform_max)
                uctl->value.integer.value[0] = mc->platform_max;

        if (snd_soc_volsw_is_stereo(mc) &&
            uctl->value.integer.value[1] > mc->platform_max)
                uctl->value.integer.value[1] = mc->platform_max;

        ret = kctl->put(kctl, uctl);

out:
        kfree(uctl);
        return ret;
}

/**
 * snd_soc_limit_volume - Set new limit to an existing volume control.
 *
 * @card: where to look for the control
 * @name: Name of the control
 * @max: new maximum limit
 *
 * Return 0 for success, else error.
 */
int snd_soc_limit_volume(struct snd_soc_card *card, const char *name, int max)
{
        struct snd_kcontrol *kctl;
        int ret = -EINVAL;

        /* Sanity check for name and max */
        if (unlikely(!name || max <= 0))
                return -EINVAL;

        kctl = snd_soc_card_get_kcontrol(card, name);
        if (kctl) {
                struct soc_mixer_control *mc =
                        (struct soc_mixer_control *)kctl->private_value;

                if (max <= mc->max - mc->min) {
                        mc->platform_max = max;
                        ret = snd_soc_clip_to_platform_max(kctl);
                }
        }

        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_limit_volume);

int snd_soc_bytes_info(struct snd_kcontrol *kcontrol,
                       struct snd_ctl_elem_info *uinfo)
{
        struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
        struct soc_bytes *params = (void *)kcontrol->private_value;

        uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
        uinfo->count = params->num_regs * component->val_bytes;

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_bytes_info);

int snd_soc_bytes_get(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_value *ucontrol)
{
        struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
        struct soc_bytes *params = (void *)kcontrol->private_value;
        int ret;

        if (component->regmap)
                ret = regmap_raw_read(component->regmap, params->base,
                                      ucontrol->value.bytes.data,
                                      params->num_regs * component->val_bytes);
        else
                ret = -EINVAL;

        /* Hide any masked bytes to ensure consistent data reporting */
        if (ret == 0 && params->mask) {
                switch (component->val_bytes) {
                case 1:
                        ucontrol->value.bytes.data[0] &= ~params->mask;
                        break;
                case 2:
                        ((u16 *)(&ucontrol->value.bytes.data))[0]
                                &= cpu_to_be16(~params->mask);
                        break;
                case 4:
                        ((u32 *)(&ucontrol->value.bytes.data))[0]
                                &= cpu_to_be32(~params->mask);
                        break;
                default:
                        return -EINVAL;
                }
        }

        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_bytes_get);

int snd_soc_bytes_put(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_value *ucontrol)
{
        struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
        struct soc_bytes *params = (void *)kcontrol->private_value;
        unsigned int val, mask;
        int ret, len;

        if (!component->regmap || !params->num_regs)
                return -EINVAL;

        len = params->num_regs * component->val_bytes;

        void *data __free(kfree) = kmemdup(ucontrol->value.bytes.data, len,
                                           GFP_KERNEL | GFP_DMA);
        if (!data)
                return -ENOMEM;

        /*
         * If we've got a mask then we need to preserve the register
         * bits.  We shouldn't modify the incoming data so take a
         * copy.
         */
        if (params->mask) {
                ret = regmap_read(component->regmap, params->base, &val);
                if (ret != 0)
                        return ret;

                val &= params->mask;

                switch (component->val_bytes) {
                case 1:
                        ((u8 *)data)[0] &= ~params->mask;
                        ((u8 *)data)[0] |= val;
                        break;
                case 2:
                        mask = ~params->mask;
                        ret = regmap_parse_val(component->regmap, &mask, &mask);
                        if (ret != 0)
                                return ret;

                        ((u16 *)data)[0] &= mask;

                        ret = regmap_parse_val(component->regmap, &val, &val);
                        if (ret != 0)
                                return ret;

                        ((u16 *)data)[0] |= val;
                        break;
                case 4:
                        mask = ~params->mask;
                        ret = regmap_parse_val(component->regmap, &mask, &mask);
                        if (ret != 0)
                                return ret;

                        ((u32 *)data)[0] &= mask;

                        ret = regmap_parse_val(component->regmap, &val, &val);
                        if (ret != 0)
                                return ret;

                        ((u32 *)data)[0] |= val;
                        break;
                default:
                        return -EINVAL;
                }
        }

        return regmap_raw_write(component->regmap, params->base, data, len);
}
EXPORT_SYMBOL_GPL(snd_soc_bytes_put);

int snd_soc_bytes_info_ext(struct snd_kcontrol *kcontrol,
                           struct snd_ctl_elem_info *ucontrol)
{
        struct soc_bytes_ext *params = (void *)kcontrol->private_value;

        ucontrol->type = SNDRV_CTL_ELEM_TYPE_BYTES;
        ucontrol->count = params->max;

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_bytes_info_ext);

int snd_soc_bytes_tlv_callback(struct snd_kcontrol *kcontrol, int op_flag,
                               unsigned int size, unsigned int __user *tlv)
{
        struct soc_bytes_ext *params = (void *)kcontrol->private_value;
        unsigned int count = size < params->max ? size : params->max;
        int ret = -ENXIO;

        switch (op_flag) {
        case SNDRV_CTL_TLV_OP_READ:
                if (params->get)
                        ret = params->get(kcontrol, tlv, count);
                break;
        case SNDRV_CTL_TLV_OP_WRITE:
                if (params->put)
                        ret = params->put(kcontrol, tlv, count);
                break;
        }

        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_bytes_tlv_callback);

/**
 * snd_soc_info_xr_sx - signed multi register info callback
 * @kcontrol: mreg control
 * @uinfo: control element information
 *
 * Callback to provide information of a control that can span multiple
 * codec registers which together forms a single signed value. Note
 * that unlike the non-xr variant of sx controls these may or may not
 * include the sign bit, depending on nbits, and there is no shift.
 *
 * Returns 0 for success.
 */
int snd_soc_info_xr_sx(struct snd_kcontrol *kcontrol,
                       struct snd_ctl_elem_info *uinfo)
{
        struct soc_mreg_control *mc =
                (struct soc_mreg_control *)kcontrol->private_value;

        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = 1;
        uinfo->value.integer.min = mc->min;
        uinfo->value.integer.max = mc->max;

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_info_xr_sx);

/**
 * snd_soc_get_xr_sx - signed multi register get callback
 * @kcontrol: mreg control
 * @ucontrol: control element information
 *
 * Callback to get the value of a control that can span multiple codec
 * registers which together forms a single signed value. The control
 * supports specifying total no of bits used to allow for bitfields
 * across the multiple codec registers. Note that unlike the non-xr
 * variant of sx controls these may or may not include the sign bit,
 * depending on nbits, and there is no shift.
 *
 * Returns 0 for success.
 */
int snd_soc_get_xr_sx(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_value *ucontrol)
{
        struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
        struct soc_mreg_control *mc =
                (struct soc_mreg_control *)kcontrol->private_value;
        unsigned int regbase = mc->regbase;
        unsigned int regcount = mc->regcount;
        unsigned int regwshift = component->val_bytes * BITS_PER_BYTE;
        unsigned int regwmask = GENMASK(regwshift - 1, 0);
        unsigned long mask = GENMASK(mc->nbits - 1, 0);
        long val = 0;
        unsigned int i;

        for (i = 0; i < regcount; i++) {
                unsigned int regval = snd_soc_component_read(component, regbase + i);

                val |= (regval & regwmask) << (regwshift * (regcount - i - 1));
        }
        val &= mask;
        if (mc->min < 0 && val > mc->max)
                val |= ~mask;
        if (mc->invert)
                val = mc->max - val;
        ucontrol->value.integer.value[0] = val;

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_get_xr_sx);

/**
 * snd_soc_put_xr_sx - signed multi register get callback
 * @kcontrol: mreg control
 * @ucontrol: control element information
 *
 * Callback to set the value of a control that can span multiple codec
 * registers which together forms a single signed value. The control
 * supports specifying total no of bits used to allow for bitfields
 * across the multiple codec registers. Note that unlike the non-xr
 * variant of sx controls these may or may not include the sign bit,
 * depending on nbits, and there is no shift.
 *
 * Returns 0 for success.
 */
int snd_soc_put_xr_sx(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_value *ucontrol)
{
        struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
        struct soc_mreg_control *mc =
                (struct soc_mreg_control *)kcontrol->private_value;
        unsigned int regbase = mc->regbase;
        unsigned int regcount = mc->regcount;
        unsigned int regwshift = component->val_bytes * BITS_PER_BYTE;
        unsigned int regwmask = GENMASK(regwshift - 1, 0);
        unsigned long mask = GENMASK(mc->nbits - 1, 0);
        long val = ucontrol->value.integer.value[0];
        int ret = 0;
        unsigned int i;

        if (val < mc->min || val > mc->max)
                return -EINVAL;
        if (mc->invert)
                val = mc->max - val;
        val &= mask;
        for (i = 0; i < regcount; i++) {
                unsigned int regval = (val >> (regwshift * (regcount - i - 1))) &
                                      regwmask;
                unsigned int regmask = (mask >> (regwshift * (regcount - i - 1))) &
                                       regwmask;
                int err = snd_soc_component_update_bits(component, regbase + i,
                                                        regmask, regval);

                if (err < 0)
                        return err;
                if (err > 0)
                        ret = err;
        }

        return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_put_xr_sx);

/**
 * snd_soc_get_strobe - strobe get callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback get the value of a strobe mixer control.
 *
 * Returns 0 for success.
 */
int snd_soc_get_strobe(struct snd_kcontrol *kcontrol,
                       struct snd_ctl_elem_value *ucontrol)
{
        struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
        struct soc_mixer_control *mc =
                (struct soc_mixer_control *)kcontrol->private_value;
        unsigned int invert = mc->invert != 0;
        unsigned int mask = BIT(mc->shift);
        unsigned int val;

        val = snd_soc_component_read(component, mc->reg);
        val &= mask;

        if (mc->shift != 0 && val != 0)
                val = val >> mc->shift;

        ucontrol->value.enumerated.item[0] = val ^ invert;

        return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_get_strobe);

/**
 * snd_soc_put_strobe - strobe put callback
 * @kcontrol: mixer control
 * @ucontrol: control element information
 *
 * Callback strobe a register bit to high then low (or the inverse)
 * in one pass of a single mixer enum control.
 *
 * Returns 1 for success.
 */
int snd_soc_put_strobe(struct snd_kcontrol *kcontrol,
                       struct snd_ctl_elem_value *ucontrol)
{
        struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
        struct soc_mixer_control *mc =
                (struct soc_mixer_control *)kcontrol->private_value;
        unsigned int strobe = ucontrol->value.enumerated.item[0] != 0;
        unsigned int invert = mc->invert != 0;
        unsigned int mask = BIT(mc->shift);
        unsigned int val1 = (strobe ^ invert) ? mask : 0;
        unsigned int val2 = (strobe ^ invert) ? 0 : mask;
        int ret;

        ret = snd_soc_component_update_bits(component, mc->reg, mask, val1);
        if (ret < 0)
                return ret;

        return snd_soc_component_update_bits(component, mc->reg, mask, val2);
}
EXPORT_SYMBOL_GPL(snd_soc_put_strobe);