// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * ALSA Soc PCM3008 codec support
 *
 * Author:      Hugo Villeneuve
 * Copyright (C) 2008 Lyrtech inc
 *
 * Based on AC97 Soc codec, original copyright follow:
 * Copyright 2005 Wolfson Microelectronics PLC.
 *
 * Generic PCM3008 support.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/soc.h>

struct pcm3008 {
        struct gpio_desc *dem0_pin;
        struct gpio_desc *dem1_pin;
        struct gpio_desc *pdad_pin;
        struct gpio_desc *pdda_pin;
};

static int pcm3008_dac_ev(struct snd_soc_dapm_widget *w,
                          struct snd_kcontrol *kcontrol,
                          int event)
{
        struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
        struct pcm3008 *pcm = component->dev->platform_data;

        gpiod_set_value_cansleep(pcm->pdda_pin,
                                 SND_SOC_DAPM_EVENT_ON(event));

        return 0;
}

static int pcm3008_adc_ev(struct snd_soc_dapm_widget *w,
                          struct snd_kcontrol *kcontrol,
                          int event)
{
        struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
        struct pcm3008 *pcm = component->dev->platform_data;

        gpiod_set_value_cansleep(pcm->pdad_pin,
                                 SND_SOC_DAPM_EVENT_ON(event));

        return 0;
}

static const struct snd_soc_dapm_widget pcm3008_dapm_widgets[] = {
SND_SOC_DAPM_INPUT("VINL"),
SND_SOC_DAPM_INPUT("VINR"),

SND_SOC_DAPM_DAC_E("DAC", NULL, SND_SOC_NOPM, 0, 0, pcm3008_dac_ev,
                   SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
SND_SOC_DAPM_ADC_E("ADC", NULL, SND_SOC_NOPM, 0, 0, pcm3008_adc_ev,
                   SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),

SND_SOC_DAPM_OUTPUT("VOUTL"),
SND_SOC_DAPM_OUTPUT("VOUTR"),
};

static const struct snd_soc_dapm_route pcm3008_dapm_routes[] = {
        { "PCM3008 Capture", NULL, "ADC" },
        { "ADC", NULL, "VINL" },
        { "ADC", NULL, "VINR" },

        { "DAC", NULL, "PCM3008 Playback" },
        { "VOUTL", NULL, "DAC" },
        { "VOUTR", NULL, "DAC" },
};

#define PCM3008_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |    \
                       SNDRV_PCM_RATE_48000)

static struct snd_soc_dai_driver pcm3008_dai = {
        .name = "pcm3008-hifi",
        .playback = {
                .stream_name = "PCM3008 Playback",
                .channels_min = 1,
                .channels_max = 2,
                .rates = PCM3008_RATES,
                .formats = SNDRV_PCM_FMTBIT_S16_LE,
        },
        .capture = {
                .stream_name = "PCM3008 Capture",
                .channels_min = 1,
                .channels_max = 2,
                .rates = PCM3008_RATES,
                .formats = SNDRV_PCM_FMTBIT_S16_LE,
        },
};

static const struct snd_soc_component_driver soc_component_dev_pcm3008 = {
        .dapm_widgets           = pcm3008_dapm_widgets,
        .num_dapm_widgets       = ARRAY_SIZE(pcm3008_dapm_widgets),
        .dapm_routes            = pcm3008_dapm_routes,
        .num_dapm_routes        = ARRAY_SIZE(pcm3008_dapm_routes),
        .idle_bias_on           = 1,
        .use_pmdown_time        = 1,
        .endianness             = 1,
};

static int pcm3008_codec_probe(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct pcm3008 *pcm;

        pcm = devm_kzalloc(dev, sizeof(*pcm), GFP_KERNEL);
        if (!pcm)
                return -ENOMEM;
        platform_set_drvdata(pdev, pcm);

        /* DEM1  DEM0  DE-EMPHASIS_MODE
         * Low   Low   De-emphasis 44.1 kHz ON
         * Low   High  De-emphasis OFF
         * High  Low   De-emphasis 48 kHz ON
         * High  High  De-emphasis 32 kHz ON
         */

        /* Configure DEM0 GPIO (turning OFF DAC De-emphasis). */
        pcm->dem0_pin = devm_gpiod_get(dev, "dem0", GPIOD_OUT_HIGH);
        if (IS_ERR(pcm->dem0_pin))
                return PTR_ERR(pcm->dem0_pin);

        /* Configure DEM1 GPIO (turning OFF DAC De-emphasis). */
        pcm->dem1_pin = devm_gpiod_get(dev, "dem1", GPIOD_OUT_LOW);
        if (IS_ERR(pcm->dem1_pin))
                return PTR_ERR(pcm->dem1_pin);

        /* Configure PDAD GPIO. */
        pcm->pdad_pin = devm_gpiod_get(dev, "pdad", GPIOD_OUT_LOW);
        if (IS_ERR(pcm->pdad_pin))
                return PTR_ERR(pcm->pdad_pin);

        /* Configure PDDA GPIO. */
        pcm->pdda_pin = devm_gpiod_get(dev, "pdda", GPIOD_OUT_LOW);
        if (IS_ERR(pcm->pdda_pin))
                return PTR_ERR(pcm->pdda_pin);

        return devm_snd_soc_register_component(dev,
                        &soc_component_dev_pcm3008, &pcm3008_dai, 1);
}

MODULE_ALIAS("platform:pcm3008-codec");

static struct platform_driver pcm3008_codec_driver = {
        .probe          = pcm3008_codec_probe,
        .driver         = {
                .name   = "pcm3008-codec",
        },
};

module_platform_driver(pcm3008_codec_driver);

MODULE_DESCRIPTION("Soc PCM3008 driver");
MODULE_AUTHOR("Hugo Villeneuve");
MODULE_LICENSE("GPL");