// SPDX-License-Identifier: GPL-2.0-only
/*
 * ASoC driver for PROTO AudioCODEC (with a WM8731)
 *
 * Author:      Florian Meier, <koalo@koalo.de>
 *            Copyright 2013
 */

#include <linux/module.h>
#include <linux/platform_device.h>

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

#include "../codecs/wm8731.h"

#define XTAL_RATE 12288000      /* This is fixed on this board */

static int snd_proto_init(struct snd_soc_pcm_runtime *rtd)
{
        struct snd_soc_card *card = rtd->card;
        struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);

        /* Set proto sysclk */
        int ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
                                         XTAL_RATE, SND_SOC_CLOCK_IN);
        if (ret < 0) {
                dev_err(card->dev, "Failed to set WM8731 SYSCLK: %d\n",
                        ret);
                return ret;
        }

        return 0;
}

static const struct snd_soc_dapm_widget snd_proto_widget[] = {
        SND_SOC_DAPM_MIC("Microphone Jack", NULL),
        SND_SOC_DAPM_HP("Headphone Jack", NULL),
};

static const struct snd_soc_dapm_route snd_proto_route[] = {
        /* speaker connected to LHPOUT/RHPOUT */
        {"Headphone Jack", NULL, "LHPOUT"},
        {"Headphone Jack", NULL, "RHPOUT"},

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

/* audio machine driver */
static struct snd_soc_card snd_proto = {
        .name           = "snd_mikroe_proto",
        .owner          = THIS_MODULE,
        .dapm_widgets   = snd_proto_widget,
        .num_dapm_widgets = ARRAY_SIZE(snd_proto_widget),
        .dapm_routes    = snd_proto_route,
        .num_dapm_routes = ARRAY_SIZE(snd_proto_route),
};

static int snd_proto_probe(struct platform_device *pdev)
{
        struct snd_soc_dai_link *dai;
        struct snd_soc_dai_link_component *comp;
        struct device_node *np = pdev->dev.of_node;
        struct device_node *codec_np, *cpu_np;
        struct device_node *bitclkmaster = NULL;
        struct device_node *framemaster = NULL;
        unsigned int dai_fmt;
        int ret = 0;

        if (!np) {
                dev_err(&pdev->dev, "No device node supplied\n");
                return -EINVAL;
        }

        snd_proto.dev = &pdev->dev;
        ret = snd_soc_of_parse_card_name(&snd_proto, "model");
        if (ret)
                return ret;

        dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL);
        if (!dai)
                return -ENOMEM;

        /* for cpus/codecs/platforms */
        comp = devm_kzalloc(&pdev->dev, 3 * sizeof(*comp), GFP_KERNEL);
        if (!comp)
                return -ENOMEM;

        snd_proto.dai_link = dai;
        snd_proto.num_links = 1;

        dai->cpus = &comp[0];
        dai->num_cpus = 1;
        dai->codecs = &comp[1];
        dai->num_codecs = 1;
        dai->platforms = &comp[2];
        dai->num_platforms = 1;

        dai->name = "WM8731";
        dai->stream_name = "WM8731 HiFi";
        dai->codecs->dai_name = "wm8731-hifi";
        dai->init = &snd_proto_init;

        codec_np = of_parse_phandle(np, "audio-codec", 0);
        if (!codec_np) {
                dev_err(&pdev->dev, "audio-codec node missing\n");
                return -EINVAL;
        }
        dai->codecs->of_node = codec_np;

        cpu_np = of_parse_phandle(np, "i2s-controller", 0);
        if (!cpu_np) {
                dev_err(&pdev->dev, "i2s-controller missing\n");
                ret = -EINVAL;
                goto put_codec_node;
        }
        dai->cpus->of_node = cpu_np;
        dai->platforms->of_node = cpu_np;

        dai_fmt = snd_soc_daifmt_parse_format(np, NULL);
        snd_soc_daifmt_parse_clock_provider_as_phandle(np, NULL,
                                                       &bitclkmaster, &framemaster);
        if (bitclkmaster != framemaster) {
                dev_err(&pdev->dev, "Must be the same bitclock and frame master\n");
                ret = -EINVAL;
                goto put_cpu_node;
        }
        if (bitclkmaster) {
                if (codec_np == bitclkmaster)
                        dai_fmt |= SND_SOC_DAIFMT_CBP_CFP;
                else
                        dai_fmt |= SND_SOC_DAIFMT_CBC_CFC;
        } else {
                dai_fmt |= snd_soc_daifmt_parse_clock_provider_as_flag(np, NULL);
        }


        dai->dai_fmt = dai_fmt;
        ret = devm_snd_soc_register_card(&pdev->dev, &snd_proto);
        if (ret)
                dev_err_probe(&pdev->dev, ret,
                        "snd_soc_register_card() failed\n");


put_cpu_node:
        of_node_put(bitclkmaster);
        of_node_put(framemaster);
        of_node_put(cpu_np);
put_codec_node:
        of_node_put(codec_np);
        return ret;
}

static const struct of_device_id snd_proto_of_match[] = {
        { .compatible = "mikroe,mikroe-proto", },
        {},
};
MODULE_DEVICE_TABLE(of, snd_proto_of_match);

static struct platform_driver snd_proto_driver = {
        .driver = {
                .name   = "snd-mikroe-proto",
                .of_match_table = snd_proto_of_match,
        },
        .probe    = snd_proto_probe,
};

module_platform_driver(snd_proto_driver);

MODULE_AUTHOR("Florian Meier");
MODULE_DESCRIPTION("ASoC Driver for PROTO board (WM8731)");
MODULE_LICENSE("GPL");