// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   ALSA driver for ICEnsemble VT17xx
 *
 *   Lowlevel functions for WM8776 codec
 *
 *      Copyright (c) 2012 Ondrej Zary <linux@rainbow-software.org>
 */

#include <linux/delay.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/tlv.h>
#include "wm8776.h"

/* low-level access */

static void snd_wm8776_write(struct snd_wm8776 *wm, u16 addr, u16 data)
{
        u8 bus_addr = addr << 1 | data >> 8;    /* addr + 9th data bit */
        u8 bus_data = data & 0xff;              /* remaining 8 data bits */

        if (addr < WM8776_REG_RESET)
                wm->regs[addr] = data;
        wm->ops.write(wm, bus_addr, bus_data);
}

/* register-level functions */

static void snd_wm8776_activate_ctl(struct snd_wm8776 *wm,
                                    const char *ctl_name,
                                    bool active)
{
        struct snd_card *card = wm->card;
        struct snd_kcontrol *kctl;
        struct snd_kcontrol_volatile *vd;
        unsigned int index_offset;

        kctl = snd_ctl_find_id_mixer(card, ctl_name);
        if (!kctl)
                return;
        index_offset = snd_ctl_get_ioff(kctl, &kctl->id);
        vd = &kctl->vd[index_offset];
        if (active)
                vd->access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
        else
                vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
        snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, &kctl->id);
}

static void snd_wm8776_update_agc_ctl(struct snd_wm8776 *wm)
{
        int i, flags_on = 0, flags_off = 0;

        switch (wm->agc_mode) {
        case WM8776_AGC_OFF:
                flags_off = WM8776_FLAG_LIM | WM8776_FLAG_ALC;
                break;
        case WM8776_AGC_LIM:
                flags_off = WM8776_FLAG_ALC;
                flags_on = WM8776_FLAG_LIM;
                break;
        case WM8776_AGC_ALC_R:
        case WM8776_AGC_ALC_L:
        case WM8776_AGC_ALC_STEREO:
                flags_off = WM8776_FLAG_LIM;
                flags_on = WM8776_FLAG_ALC;
                break;
        }

        for (i = 0; i < WM8776_CTL_COUNT; i++)
                if (wm->ctl[i].flags & flags_off)
                        snd_wm8776_activate_ctl(wm, wm->ctl[i].name, false);
                else if (wm->ctl[i].flags & flags_on)
                        snd_wm8776_activate_ctl(wm, wm->ctl[i].name, true);
}

static void snd_wm8776_set_agc(struct snd_wm8776 *wm, u16 agc, u16 nothing)
{
        u16 alc1 = wm->regs[WM8776_REG_ALCCTRL1] & ~WM8776_ALC1_LCT_MASK;
        u16 alc2 = wm->regs[WM8776_REG_ALCCTRL2] & ~WM8776_ALC2_LCEN;

        switch (agc) {
        case 0: /* Off */
                wm->agc_mode = WM8776_AGC_OFF;
                break;
        case 1: /* Limiter */
                alc2 |= WM8776_ALC2_LCEN;
                wm->agc_mode = WM8776_AGC_LIM;
                break;
        case 2: /* ALC Right */
                alc1 |= WM8776_ALC1_LCSEL_ALCR;
                alc2 |= WM8776_ALC2_LCEN;
                wm->agc_mode = WM8776_AGC_ALC_R;
                break;
        case 3: /* ALC Left */
                alc1 |= WM8776_ALC1_LCSEL_ALCL;
                alc2 |= WM8776_ALC2_LCEN;
                wm->agc_mode = WM8776_AGC_ALC_L;
                break;
        case 4: /* ALC Stereo */
                alc1 |= WM8776_ALC1_LCSEL_ALCSTEREO;
                alc2 |= WM8776_ALC2_LCEN;
                wm->agc_mode = WM8776_AGC_ALC_STEREO;
                break;
        }
        snd_wm8776_write(wm, WM8776_REG_ALCCTRL1, alc1);
        snd_wm8776_write(wm, WM8776_REG_ALCCTRL2, alc2);
        snd_wm8776_update_agc_ctl(wm);
}

static void snd_wm8776_get_agc(struct snd_wm8776 *wm, u16 *mode, u16 *nothing)
{
        *mode = wm->agc_mode;
}

/* mixer controls */

static const DECLARE_TLV_DB_SCALE(wm8776_hp_tlv, -7400, 100, 1);
static const DECLARE_TLV_DB_SCALE(wm8776_dac_tlv, -12750, 50, 1);
static const DECLARE_TLV_DB_SCALE(wm8776_adc_tlv, -10350, 50, 1);
static const DECLARE_TLV_DB_SCALE(wm8776_lct_tlv, -1600, 100, 0);
static const DECLARE_TLV_DB_SCALE(wm8776_maxgain_tlv, 0, 400, 0);
static const DECLARE_TLV_DB_SCALE(wm8776_ngth_tlv, -7800, 600, 0);
static const DECLARE_TLV_DB_SCALE(wm8776_maxatten_lim_tlv, -1200, 100, 0);
static const DECLARE_TLV_DB_SCALE(wm8776_maxatten_alc_tlv, -2100, 400, 0);

static const struct snd_wm8776_ctl snd_wm8776_default_ctl[WM8776_CTL_COUNT] = {
        [WM8776_CTL_DAC_VOL] = {
                .name = "Master Playback Volume",
                .type = SNDRV_CTL_ELEM_TYPE_INTEGER,
                .tlv = wm8776_dac_tlv,
                .reg1 = WM8776_REG_DACLVOL,
                .reg2 = WM8776_REG_DACRVOL,
                .mask1 = WM8776_DACVOL_MASK,
                .mask2 = WM8776_DACVOL_MASK,
                .max = 0xff,
                .flags = WM8776_FLAG_STEREO | WM8776_FLAG_VOL_UPDATE,
        },
        [WM8776_CTL_DAC_SW] = {
                .name = "Master Playback Switch",
                .type = SNDRV_CTL_ELEM_TYPE_BOOLEAN,
                .reg1 = WM8776_REG_DACCTRL1,
                .reg2 = WM8776_REG_DACCTRL1,
                .mask1 = WM8776_DAC_PL_LL,
                .mask2 = WM8776_DAC_PL_RR,
                .flags = WM8776_FLAG_STEREO,
        },
        [WM8776_CTL_DAC_ZC_SW] = {
                .name = "Master Zero Cross Detect Playback Switch",
                .type = SNDRV_CTL_ELEM_TYPE_BOOLEAN,
                .reg1 = WM8776_REG_DACCTRL1,
                .mask1 = WM8776_DAC_DZCEN,
        },
        [WM8776_CTL_HP_VOL] = {
                .name = "Headphone Playback Volume",
                .type = SNDRV_CTL_ELEM_TYPE_INTEGER,
                .tlv = wm8776_hp_tlv,
                .reg1 = WM8776_REG_HPLVOL,
                .reg2 = WM8776_REG_HPRVOL,
                .mask1 = WM8776_HPVOL_MASK,
                .mask2 = WM8776_HPVOL_MASK,
                .min = 0x2f,
                .max = 0x7f,
                .flags = WM8776_FLAG_STEREO | WM8776_FLAG_VOL_UPDATE,
        },
        [WM8776_CTL_HP_SW] = {
                .name = "Headphone Playback Switch",
                .type = SNDRV_CTL_ELEM_TYPE_BOOLEAN,
                .reg1 = WM8776_REG_PWRDOWN,
                .mask1 = WM8776_PWR_HPPD,
                .flags = WM8776_FLAG_INVERT,
        },
        [WM8776_CTL_HP_ZC_SW] = {
                .name = "Headphone Zero Cross Detect Playback Switch",
                .type = SNDRV_CTL_ELEM_TYPE_BOOLEAN,
                .reg1 = WM8776_REG_HPLVOL,
                .reg2 = WM8776_REG_HPRVOL,
                .mask1 = WM8776_VOL_HPZCEN,
                .mask2 = WM8776_VOL_HPZCEN,
                .flags = WM8776_FLAG_STEREO,
        },
        [WM8776_CTL_AUX_SW] = {
                .name = "AUX Playback Switch",
                .type = SNDRV_CTL_ELEM_TYPE_BOOLEAN,
                .reg1 = WM8776_REG_OUTMUX,
                .mask1 = WM8776_OUTMUX_AUX,
        },
        [WM8776_CTL_BYPASS_SW] = {
                .name = "Bypass Playback Switch",
                .type = SNDRV_CTL_ELEM_TYPE_BOOLEAN,
                .reg1 = WM8776_REG_OUTMUX,
                .mask1 = WM8776_OUTMUX_BYPASS,
        },
        [WM8776_CTL_DAC_IZD_SW] = {
                .name = "Infinite Zero Detect Playback Switch",
                .type = SNDRV_CTL_ELEM_TYPE_BOOLEAN,
                .reg1 = WM8776_REG_DACCTRL1,
                .mask1 = WM8776_DAC_IZD,
        },
        [WM8776_CTL_PHASE_SW] = {
                .name = "Phase Invert Playback Switch",
                .type = SNDRV_CTL_ELEM_TYPE_BOOLEAN,
                .reg1 = WM8776_REG_PHASESWAP,
                .reg2 = WM8776_REG_PHASESWAP,
                .mask1 = WM8776_PHASE_INVERTL,
                .mask2 = WM8776_PHASE_INVERTR,
                .flags = WM8776_FLAG_STEREO,
        },
        [WM8776_CTL_DEEMPH_SW] = {
                .name = "Deemphasis Playback Switch",
                .type = SNDRV_CTL_ELEM_TYPE_BOOLEAN,
                .reg1 = WM8776_REG_DACCTRL2,
                .mask1 = WM8776_DAC2_DEEMPH,
        },
        [WM8776_CTL_ADC_VOL] = {
                .name = "Input Capture Volume",
                .type = SNDRV_CTL_ELEM_TYPE_INTEGER,
                .tlv = wm8776_adc_tlv,
                .reg1 = WM8776_REG_ADCLVOL,
                .reg2 = WM8776_REG_ADCRVOL,
                .mask1 = WM8776_ADC_GAIN_MASK,
                .mask2 = WM8776_ADC_GAIN_MASK,
                .max = 0xff,
                .flags = WM8776_FLAG_STEREO | WM8776_FLAG_VOL_UPDATE,
        },
        [WM8776_CTL_ADC_SW] = {
                .name = "Input Capture Switch",
                .type = SNDRV_CTL_ELEM_TYPE_BOOLEAN,
                .reg1 = WM8776_REG_ADCMUX,
                .reg2 = WM8776_REG_ADCMUX,
                .mask1 = WM8776_ADC_MUTEL,
                .mask2 = WM8776_ADC_MUTER,
                .flags = WM8776_FLAG_STEREO | WM8776_FLAG_INVERT,
        },
        [WM8776_CTL_INPUT1_SW] = {
                .name = "AIN1 Capture Switch",
                .type = SNDRV_CTL_ELEM_TYPE_BOOLEAN,
                .reg1 = WM8776_REG_ADCMUX,
                .mask1 = WM8776_ADC_MUX_AIN1,
        },
        [WM8776_CTL_INPUT2_SW] = {
                .name = "AIN2 Capture Switch",
                .type = SNDRV_CTL_ELEM_TYPE_BOOLEAN,
                .reg1 = WM8776_REG_ADCMUX,
                .mask1 = WM8776_ADC_MUX_AIN2,
        },
        [WM8776_CTL_INPUT3_SW] = {
                .name = "AIN3 Capture Switch",
                .type = SNDRV_CTL_ELEM_TYPE_BOOLEAN,
                .reg1 = WM8776_REG_ADCMUX,
                .mask1 = WM8776_ADC_MUX_AIN3,
        },
        [WM8776_CTL_INPUT4_SW] = {
                .name = "AIN4 Capture Switch",
                .type = SNDRV_CTL_ELEM_TYPE_BOOLEAN,
                .reg1 = WM8776_REG_ADCMUX,
                .mask1 = WM8776_ADC_MUX_AIN4,
        },
        [WM8776_CTL_INPUT5_SW] = {
                .name = "AIN5 Capture Switch",
                .type = SNDRV_CTL_ELEM_TYPE_BOOLEAN,
                .reg1 = WM8776_REG_ADCMUX,
                .mask1 = WM8776_ADC_MUX_AIN5,
        },
        [WM8776_CTL_AGC_SEL] = {
                .name = "AGC Select Capture Enum",
                .type = SNDRV_CTL_ELEM_TYPE_ENUMERATED,
                .enum_names = { "Off", "Limiter", "ALC Right", "ALC Left",
                                "ALC Stereo" },
                .max = 5,       /* .enum_names item count */
                .set = snd_wm8776_set_agc,
                .get = snd_wm8776_get_agc,
        },
        [WM8776_CTL_LIM_THR] = {
                .name = "Limiter Threshold Capture Volume",
                .type = SNDRV_CTL_ELEM_TYPE_INTEGER,
                .tlv = wm8776_lct_tlv,
                .reg1 = WM8776_REG_ALCCTRL1,
                .mask1 = WM8776_ALC1_LCT_MASK,
                .max = 15,
                .flags = WM8776_FLAG_LIM,
        },
        [WM8776_CTL_LIM_ATK] = {
                .name = "Limiter Attack Time Capture Enum",
                .type = SNDRV_CTL_ELEM_TYPE_ENUMERATED,
                .enum_names = { "0.25 ms", "0.5 ms", "1 ms", "2 ms", "4 ms",
                        "8 ms", "16 ms", "32 ms", "64 ms", "128 ms", "256 ms" },
                .max = 11,      /* .enum_names item count */
                .reg1 = WM8776_REG_ALCCTRL3,
                .mask1 = WM8776_ALC3_ATK_MASK,
                .flags = WM8776_FLAG_LIM,
        },
        [WM8776_CTL_LIM_DCY] = {
                .name = "Limiter Decay Time Capture Enum",
                .type = SNDRV_CTL_ELEM_TYPE_ENUMERATED,
                .enum_names = { "1.2 ms", "2.4 ms", "4.8 ms", "9.6 ms",
                        "19.2 ms", "38.4 ms", "76.8 ms", "154 ms", "307 ms",
                        "614 ms", "1.23 s" },
                .max = 11,      /* .enum_names item count */
                .reg1 = WM8776_REG_ALCCTRL3,
                .mask1 = WM8776_ALC3_DCY_MASK,
                .flags = WM8776_FLAG_LIM,
        },
        [WM8776_CTL_LIM_TRANWIN] = {
                .name = "Limiter Transient Window Capture Enum",
                .type = SNDRV_CTL_ELEM_TYPE_ENUMERATED,
                .enum_names = { "0 us", "62.5 us", "125 us", "250 us", "500 us",
                        "1 ms", "2 ms", "4 ms" },
                .max = 8,       /* .enum_names item count */
                .reg1 = WM8776_REG_LIMITER,
                .mask1 = WM8776_LIM_TRANWIN_MASK,
                .flags = WM8776_FLAG_LIM,
        },
        [WM8776_CTL_LIM_MAXATTN] = {
                .name = "Limiter Maximum Attenuation Capture Volume",
                .type = SNDRV_CTL_ELEM_TYPE_INTEGER,
                .tlv = wm8776_maxatten_lim_tlv,
                .reg1 = WM8776_REG_LIMITER,
                .mask1 = WM8776_LIM_MAXATTEN_MASK,
                .min = 3,
                .max = 12,
                .flags = WM8776_FLAG_LIM | WM8776_FLAG_INVERT,
        },
        [WM8776_CTL_ALC_TGT] = {
                .name = "ALC Target Level Capture Volume",
                .type = SNDRV_CTL_ELEM_TYPE_INTEGER,
                .tlv = wm8776_lct_tlv,
                .reg1 = WM8776_REG_ALCCTRL1,
                .mask1 = WM8776_ALC1_LCT_MASK,
                .max = 15,
                .flags = WM8776_FLAG_ALC,
        },
        [WM8776_CTL_ALC_ATK] = {
                .name = "ALC Attack Time Capture Enum",
                .type = SNDRV_CTL_ELEM_TYPE_ENUMERATED,
                .enum_names = { "8.40 ms", "16.8 ms", "33.6 ms", "67.2 ms",
                        "134 ms", "269 ms", "538 ms", "1.08 s", "2.15 s",
                        "4.3 s", "8.6 s" },
                .max = 11,      /* .enum_names item count */
                .reg1 = WM8776_REG_ALCCTRL3,
                .mask1 = WM8776_ALC3_ATK_MASK,
                .flags = WM8776_FLAG_ALC,
        },
        [WM8776_CTL_ALC_DCY] = {
                .name = "ALC Decay Time Capture Enum",
                .type = SNDRV_CTL_ELEM_TYPE_ENUMERATED,
                .enum_names = { "33.5 ms", "67.0 ms", "134 ms", "268 ms",
                        "536 ms", "1.07 s", "2.14 s", "4.29 s", "8.58 s",
                        "17.2 s", "34.3 s" },
                .max = 11,      /* .enum_names item count */
                .reg1 = WM8776_REG_ALCCTRL3,
                .mask1 = WM8776_ALC3_DCY_MASK,
                .flags = WM8776_FLAG_ALC,
        },
        [WM8776_CTL_ALC_MAXGAIN] = {
                .name = "ALC Maximum Gain Capture Volume",
                .type = SNDRV_CTL_ELEM_TYPE_INTEGER,
                .tlv = wm8776_maxgain_tlv,
                .reg1 = WM8776_REG_ALCCTRL1,
                .mask1 = WM8776_ALC1_MAXGAIN_MASK,
                .min = 1,
                .max = 7,
                .flags = WM8776_FLAG_ALC,
        },
        [WM8776_CTL_ALC_MAXATTN] = {
                .name = "ALC Maximum Attenuation Capture Volume",
                .type = SNDRV_CTL_ELEM_TYPE_INTEGER,
                .tlv = wm8776_maxatten_alc_tlv,
                .reg1 = WM8776_REG_LIMITER,
                .mask1 = WM8776_LIM_MAXATTEN_MASK,
                .min = 10,
                .max = 15,
                .flags = WM8776_FLAG_ALC | WM8776_FLAG_INVERT,
        },
        [WM8776_CTL_ALC_HLD] = {
                .name = "ALC Hold Time Capture Enum",
                .type = SNDRV_CTL_ELEM_TYPE_ENUMERATED,
                .enum_names = { "0 ms", "2.67 ms", "5.33 ms", "10.6 ms",
                        "21.3 ms", "42.7 ms", "85.3 ms", "171 ms", "341 ms",
                        "683 ms", "1.37 s", "2.73 s", "5.46 s", "10.9 s",
                        "21.8 s", "43.7 s" },
                .max = 16,      /* .enum_names item count */
                .reg1 = WM8776_REG_ALCCTRL2,
                .mask1 = WM8776_ALC2_HOLD_MASK,
                .flags = WM8776_FLAG_ALC,
        },
        [WM8776_CTL_NGT_SW] = {
                .name = "Noise Gate Capture Switch",
                .type = SNDRV_CTL_ELEM_TYPE_BOOLEAN,
                .reg1 = WM8776_REG_NOISEGATE,
                .mask1 = WM8776_NGAT_ENABLE,
                .flags = WM8776_FLAG_ALC,
        },
        [WM8776_CTL_NGT_THR] = {
                .name = "Noise Gate Threshold Capture Volume",
                .type = SNDRV_CTL_ELEM_TYPE_INTEGER,
                .tlv = wm8776_ngth_tlv,
                .reg1 = WM8776_REG_NOISEGATE,
                .mask1 = WM8776_NGAT_THR_MASK,
                .max = 7,
                .flags = WM8776_FLAG_ALC,
        },
};

/* exported functions */

void snd_wm8776_init(struct snd_wm8776 *wm)
{
        int i;
        static const u16 default_values[] = {
                0x000, 0x100, 0x000,
                0x000, 0x100, 0x000,
                0x000, 0x090, 0x000, 0x000,
                0x022, 0x022, 0x022,
                0x008, 0x0cf, 0x0cf, 0x07b, 0x000,
                0x032, 0x000, 0x0a6, 0x001, 0x001
        };

        memcpy(wm->ctl, snd_wm8776_default_ctl, sizeof(wm->ctl));

        snd_wm8776_write(wm, WM8776_REG_RESET, 0x00); /* reset */
        udelay(10);
        /* load defaults */
        for (i = 0; i < ARRAY_SIZE(default_values); i++)
                snd_wm8776_write(wm, i, default_values[i]);
}

void snd_wm8776_resume(struct snd_wm8776 *wm)
{
        int i;

        for (i = 0; i < WM8776_REG_COUNT; i++)
                snd_wm8776_write(wm, i, wm->regs[i]);
}

void snd_wm8776_set_power(struct snd_wm8776 *wm, u16 power)
{
        snd_wm8776_write(wm, WM8776_REG_PWRDOWN, power);
}

void snd_wm8776_volume_restore(struct snd_wm8776 *wm)
{
        u16 val = wm->regs[WM8776_REG_DACRVOL];
        /* restore volume after MCLK stopped */
        snd_wm8776_write(wm, WM8776_REG_DACRVOL, val | WM8776_VOL_UPDATE);
}

/* mixer callbacks */

static int snd_wm8776_volume_info(struct snd_kcontrol *kcontrol,
                                   struct snd_ctl_elem_info *uinfo)
{
        struct snd_wm8776 *wm = snd_kcontrol_chip(kcontrol);
        int n = kcontrol->private_value;

        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = (wm->ctl[n].flags & WM8776_FLAG_STEREO) ? 2 : 1;
        uinfo->value.integer.min = wm->ctl[n].min;
        uinfo->value.integer.max = wm->ctl[n].max;

        return 0;
}

static int snd_wm8776_enum_info(struct snd_kcontrol *kcontrol,
                                      struct snd_ctl_elem_info *uinfo)
{
        struct snd_wm8776 *wm = snd_kcontrol_chip(kcontrol);
        int n = kcontrol->private_value;

        return snd_ctl_enum_info(uinfo, 1, wm->ctl[n].max,
                                                wm->ctl[n].enum_names);
}

static int snd_wm8776_ctl_get(struct snd_kcontrol *kcontrol,
                                  struct snd_ctl_elem_value *ucontrol)
{
        struct snd_wm8776 *wm = snd_kcontrol_chip(kcontrol);
        int n = kcontrol->private_value;
        u16 val1, val2;

        if (wm->ctl[n].get)
                wm->ctl[n].get(wm, &val1, &val2);
        else {
                val1 = wm->regs[wm->ctl[n].reg1] & wm->ctl[n].mask1;
                val1 >>= __ffs(wm->ctl[n].mask1);
                if (wm->ctl[n].flags & WM8776_FLAG_STEREO) {
                        val2 = wm->regs[wm->ctl[n].reg2] & wm->ctl[n].mask2;
                        val2 >>= __ffs(wm->ctl[n].mask2);
                        if (wm->ctl[n].flags & WM8776_FLAG_VOL_UPDATE)
                                val2 &= ~WM8776_VOL_UPDATE;
                }
        }
        if (wm->ctl[n].flags & WM8776_FLAG_INVERT) {
                val1 = wm->ctl[n].max - (val1 - wm->ctl[n].min);
                if (wm->ctl[n].flags & WM8776_FLAG_STEREO)
                        val2 = wm->ctl[n].max - (val2 - wm->ctl[n].min);
        }
        ucontrol->value.integer.value[0] = val1;
        if (wm->ctl[n].flags & WM8776_FLAG_STEREO)
                ucontrol->value.integer.value[1] = val2;

        return 0;
}

static int snd_wm8776_ctl_put(struct snd_kcontrol *kcontrol,
                                  struct snd_ctl_elem_value *ucontrol)
{
        struct snd_wm8776 *wm = snd_kcontrol_chip(kcontrol);
        int n = kcontrol->private_value;
        u16 val, regval1, regval2;

        /* this also works for enum because value is a union */
        regval1 = ucontrol->value.integer.value[0];
        regval2 = ucontrol->value.integer.value[1];
        if (wm->ctl[n].flags & WM8776_FLAG_INVERT) {
                regval1 = wm->ctl[n].max - (regval1 - wm->ctl[n].min);
                regval2 = wm->ctl[n].max - (regval2 - wm->ctl[n].min);
        }
        if (wm->ctl[n].set)
                wm->ctl[n].set(wm, regval1, regval2);
        else {
                val = wm->regs[wm->ctl[n].reg1] & ~wm->ctl[n].mask1;
                val |= regval1 << __ffs(wm->ctl[n].mask1);
                /* both stereo controls in one register */
                if (wm->ctl[n].flags & WM8776_FLAG_STEREO &&
                                wm->ctl[n].reg1 == wm->ctl[n].reg2) {
                        val &= ~wm->ctl[n].mask2;
                        val |= regval2 << __ffs(wm->ctl[n].mask2);
                }
                snd_wm8776_write(wm, wm->ctl[n].reg1, val);
                /* stereo controls in different registers */
                if (wm->ctl[n].flags & WM8776_FLAG_STEREO &&
                                wm->ctl[n].reg1 != wm->ctl[n].reg2) {
                        val = wm->regs[wm->ctl[n].reg2] & ~wm->ctl[n].mask2;
                        val |= regval2 << __ffs(wm->ctl[n].mask2);
                        if (wm->ctl[n].flags & WM8776_FLAG_VOL_UPDATE)
                                val |= WM8776_VOL_UPDATE;
                        snd_wm8776_write(wm, wm->ctl[n].reg2, val);
                }
        }

        return 0;
}

static int snd_wm8776_add_control(struct snd_wm8776 *wm, int num)
{
        struct snd_kcontrol_new cont;
        struct snd_kcontrol *ctl;

        memset(&cont, 0, sizeof(cont));
        cont.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
        cont.private_value = num;
        cont.name = wm->ctl[num].name;
        cont.access = SNDRV_CTL_ELEM_ACCESS_READWRITE;
        if (wm->ctl[num].flags & WM8776_FLAG_LIM ||
            wm->ctl[num].flags & WM8776_FLAG_ALC)
                cont.access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
        cont.tlv.p = NULL;
        cont.get = snd_wm8776_ctl_get;
        cont.put = snd_wm8776_ctl_put;

        switch (wm->ctl[num].type) {
        case SNDRV_CTL_ELEM_TYPE_INTEGER:
                cont.info = snd_wm8776_volume_info;
                cont.access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ;
                cont.tlv.p = wm->ctl[num].tlv;
                break;
        case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
                wm->ctl[num].max = 1;
                if (wm->ctl[num].flags & WM8776_FLAG_STEREO)
                        cont.info = snd_ctl_boolean_stereo_info;
                else
                        cont.info = snd_ctl_boolean_mono_info;
                break;
        case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
                cont.info = snd_wm8776_enum_info;
                break;
        default:
                return -EINVAL;
        }
        ctl = snd_ctl_new1(&cont, wm);
        if (!ctl)
                return -ENOMEM;

        return snd_ctl_add(wm->card, ctl);
}

int snd_wm8776_build_controls(struct snd_wm8776 *wm)
{
        int err, i;

        for (i = 0; i < WM8776_CTL_COUNT; i++)
                if (wm->ctl[i].name) {
                        err = snd_wm8776_add_control(wm, i);
                        if (err < 0)
                                return err;
                }

        return 0;
}