// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * sam9g20_wm8731  --  SoC audio for AT91SAM9G20-based
 *                      ATMEL AT91SAM9G20ek board.
 *
 *  Copyright (C) 2005 SAN People
 *  Copyright (C) 2008 Atmel
 *
 * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
 *
 * Based on ati_b1_wm8731.c by:
 * Frank Mandarino <fmandarino@endrelia.com>
 * Copyright 2006 Endrelia Technologies Inc.
 * Based on corgi.c by:
 * Copyright 2005 Wolfson Microelectronics PLC.
 * Copyright 2005 Openedhand Ltd.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/of.h>

#include <linux/atmel-ssc.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include "../codecs/wm8731.h"
#include "atmel-pcm.h"
#include "atmel_ssc_dai.h"

#define MCLK_RATE 12000000

/*
 * As shipped the board does not have inputs.  However, it is relatively
 * straightforward to modify the board to hook them up so support is left
 * in the driver.
 */
#undef ENABLE_MIC_INPUT

static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
        SND_SOC_DAPM_MIC("Int Mic", NULL),
        SND_SOC_DAPM_SPK("Ext Spk", NULL),
};

static const struct snd_soc_dapm_route intercon[] = {

        /* speaker connected to LHPOUT/RHPOUT */
        {"Ext Spk", NULL, "LHPOUT"},
        {"Ext Spk", NULL, "RHPOUT"},

        /* mic is connected to Mic Jack, with WM8731 Mic Bias */
        {"MICIN", NULL, "Mic Bias"},
        {"Mic Bias", NULL, "Int Mic"},
};

/*
 * Logic for a wm8731 as connected on a at91sam9g20ek board.
 */
static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
{
        struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
        struct device *dev = rtd->dev;
        int ret;

        dev_dbg(dev, "%s called\n", __func__);

        ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
                                     MCLK_RATE, SND_SOC_CLOCK_IN);
        if (ret < 0) {
                dev_err(dev, "Failed to set WM8731 SYSCLK: %d\n", ret);
                return ret;
        }

#ifndef ENABLE_MIC_INPUT
        snd_soc_dapm_disable_pin(snd_soc_card_to_dapm(rtd->card), "Int Mic");
#endif

        return 0;
}

SND_SOC_DAILINK_DEFS(pcm,
        DAILINK_COMP_ARRAY(COMP_CPU("at91rm9200_ssc.0")),
        DAILINK_COMP_ARRAY(COMP_CODEC("wm8731.0-001b", "wm8731-hifi")),
        DAILINK_COMP_ARRAY(COMP_PLATFORM("at91rm9200_ssc.0")));

static struct snd_soc_dai_link at91sam9g20ek_dai = {
        .name = "WM8731",
        .stream_name = "WM8731 PCM",
        .init = at91sam9g20ek_wm8731_init,
        .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
                   SND_SOC_DAIFMT_CBP_CFP,
#ifndef ENABLE_MIC_INPUT
        .playback_only = true,
#endif
        SND_SOC_DAILINK_REG(pcm),
};

static struct snd_soc_card snd_soc_at91sam9g20ek = {
        .name = "AT91SAMG20-EK",
        .owner = THIS_MODULE,
        .dai_link = &at91sam9g20ek_dai,
        .num_links = 1,

        .dapm_widgets = at91sam9g20ek_dapm_widgets,
        .num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
        .dapm_routes = intercon,
        .num_dapm_routes = ARRAY_SIZE(intercon),
        .fully_routed = true,
};

static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
{
        struct device_node *np = pdev->dev.of_node;
        struct device_node *codec_np, *cpu_np;
        struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
        int ret;

        if (!np) {
                return -ENODEV;
        }

        ret = atmel_ssc_set_audio(0);
        if (ret) {
                dev_err(&pdev->dev, "ssc channel is not valid: %d\n", ret);
                return ret;
        }

        card->dev = &pdev->dev;

        /* Parse device node info */
        ret = snd_soc_of_parse_card_name(card, "atmel,model");
        if (ret)
                goto err;

        ret = snd_soc_of_parse_audio_routing(card,
                "atmel,audio-routing");
        if (ret)
                goto err;

        /* Parse codec info */
        at91sam9g20ek_dai.codecs->name = NULL;
        codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
        if (!codec_np) {
                dev_err(&pdev->dev, "codec info missing\n");
                ret = -EINVAL;
                goto err;
        }
        at91sam9g20ek_dai.codecs->of_node = codec_np;

        /* Parse dai and platform info */
        at91sam9g20ek_dai.cpus->dai_name = NULL;
        at91sam9g20ek_dai.platforms->name = NULL;
        cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
        if (!cpu_np) {
                dev_err(&pdev->dev, "dai and pcm info missing\n");
                of_node_put(codec_np);
                ret = -EINVAL;
                goto err;
        }
        at91sam9g20ek_dai.cpus->of_node = cpu_np;
        at91sam9g20ek_dai.platforms->of_node = cpu_np;

        of_node_put(codec_np);
        of_node_put(cpu_np);

        ret = snd_soc_register_card(card);
        if (ret) {
                dev_err_probe(&pdev->dev, ret,
                              "snd_soc_register_card() failed\n");
                goto err;
        }

        return 0;

err:
        atmel_ssc_put_audio(0);
        return ret;
}

static void at91sam9g20ek_audio_remove(struct platform_device *pdev)
{
        struct snd_soc_card *card = platform_get_drvdata(pdev);

        snd_soc_unregister_card(card);
        atmel_ssc_put_audio(0);
}

#ifdef CONFIG_OF
static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
        { .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
        { }
};
MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
#endif

static struct platform_driver at91sam9g20ek_audio_driver = {
        .driver = {
                .name   = "at91sam9g20ek-audio",
                .of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
        },
        .probe  = at91sam9g20ek_audio_probe,
        .remove = at91sam9g20ek_audio_remove,
};

module_platform_driver(at91sam9g20ek_audio_driver);

/* Module information */
MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
MODULE_ALIAS("platform:at91sam9g20ek-audio");
MODULE_LICENSE("GPL");