// SPDX-License-Identifier: GPL-2.0-only
/*
 * ASoC driver for TI DAVINCI EVM platform
 *
 * Author:      Vladimir Barinov, <vbarinov@embeddedalley.com>
 * Copyright:   (C) 2007 MontaVista Software, Inc., <source@mvista.com>
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/of_platform.h>
#include <linux/clk.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>

#include <asm/dma.h>
#include <asm/mach-types.h>

struct snd_soc_card_drvdata_davinci {
        struct clk *mclk;
        unsigned sysclk;
};

static int evm_startup(struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
        struct snd_soc_card *soc_card = rtd->card;
        struct snd_soc_card_drvdata_davinci *drvdata =
                snd_soc_card_get_drvdata(soc_card);

        if (drvdata->mclk)
                return clk_prepare_enable(drvdata->mclk);

        return 0;
}

static void evm_shutdown(struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
        struct snd_soc_card *soc_card = rtd->card;
        struct snd_soc_card_drvdata_davinci *drvdata =
                snd_soc_card_get_drvdata(soc_card);

        clk_disable_unprepare(drvdata->mclk);
}

static int evm_hw_params(struct snd_pcm_substream *substream,
                         struct snd_pcm_hw_params *params)
{
        struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
        struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
        struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
        struct snd_soc_card *soc_card = rtd->card;
        int ret = 0;
        unsigned sysclk = ((struct snd_soc_card_drvdata_davinci *)
                           snd_soc_card_get_drvdata(soc_card))->sysclk;

        /* set the codec system clock */
        ret = snd_soc_dai_set_sysclk(codec_dai, 0, sysclk, SND_SOC_CLOCK_OUT);
        if (ret < 0)
                return ret;

        /* set the CPU system clock */
        ret = snd_soc_dai_set_sysclk(cpu_dai, 0, sysclk, SND_SOC_CLOCK_OUT);
        if (ret < 0 && ret != -ENOTSUPP)
                return ret;

        return 0;
}

static const struct snd_soc_ops evm_ops = {
        .startup = evm_startup,
        .shutdown = evm_shutdown,
        .hw_params = evm_hw_params,
};

/* davinci-evm machine dapm widgets */
static const struct snd_soc_dapm_widget aic3x_dapm_widgets[] = {
        SND_SOC_DAPM_HP("Headphone Jack", NULL),
        SND_SOC_DAPM_LINE("Line Out", NULL),
        SND_SOC_DAPM_MIC("Mic Jack", NULL),
        SND_SOC_DAPM_LINE("Line In", NULL),
};

/* davinci-evm machine audio_mapnections to the codec pins */
static const struct snd_soc_dapm_route audio_map[] = {
        /* Headphone connected to HPLOUT, HPROUT */
        {"Headphone Jack", NULL, "HPLOUT"},
        {"Headphone Jack", NULL, "HPROUT"},

        /* Line Out connected to LLOUT, RLOUT */
        {"Line Out", NULL, "LLOUT"},
        {"Line Out", NULL, "RLOUT"},

        /* Mic connected to (MIC3L | MIC3R) */
        {"MIC3L", NULL, "Mic Bias"},
        {"MIC3R", NULL, "Mic Bias"},
        {"Mic Bias", NULL, "Mic Jack"},

        /* Line In connected to (LINE1L | LINE2L), (LINE1R | LINE2R) */
        {"LINE1L", NULL, "Line In"},
        {"LINE2L", NULL, "Line In"},
        {"LINE1R", NULL, "Line In"},
        {"LINE2R", NULL, "Line In"},
};

/* Logic for a aic3x as connected on a davinci-evm */
static int evm_aic3x_init(struct snd_soc_pcm_runtime *rtd)
{
        struct snd_soc_card *card = rtd->card;
        struct snd_soc_dapm_context *dapm = snd_soc_card_to_dapm(rtd->card);
        struct device_node *np = card->dev->of_node;
        int ret;

        /* Add davinci-evm specific widgets */
        snd_soc_dapm_new_controls(dapm, aic3x_dapm_widgets,
                                  ARRAY_SIZE(aic3x_dapm_widgets));

        if (np) {
                ret = snd_soc_of_parse_audio_routing(card, "ti,audio-routing");
                if (ret)
                        return ret;
        } else {
                /* Set up davinci-evm specific audio path audio_map */
                snd_soc_dapm_add_routes(dapm, audio_map,
                                        ARRAY_SIZE(audio_map));
        }

        /* not connected */
        snd_soc_dapm_disable_pin(dapm, "MONO_LOUT");
        snd_soc_dapm_disable_pin(dapm, "HPLCOM");
        snd_soc_dapm_disable_pin(dapm, "HPRCOM");

        return 0;
}

/*
 * The struct is used as place holder. It will be completely
 * filled with data from dt node.
 */
SND_SOC_DAILINK_DEFS(evm,
        DAILINK_COMP_ARRAY(COMP_EMPTY()),
        DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "tlv320aic3x-hifi")),
        DAILINK_COMP_ARRAY(COMP_EMPTY()));

static struct snd_soc_dai_link evm_dai_tlv320aic3x = {
        .name           = "TLV320AIC3X",
        .stream_name    = "AIC3X",
        .ops            = &evm_ops,
        .init           = evm_aic3x_init,
        .dai_fmt = SND_SOC_DAIFMT_DSP_B | SND_SOC_DAIFMT_CBP_CFP |
                   SND_SOC_DAIFMT_IB_NF,
        SND_SOC_DAILINK_REG(evm),
};

static const struct of_device_id davinci_evm_dt_ids[] = {
        {
                .compatible = "ti,da830-evm-audio",
                .data = (void *) &evm_dai_tlv320aic3x,
        },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, davinci_evm_dt_ids);

/* davinci evm audio machine driver */
static struct snd_soc_card evm_soc_card = {
        .owner = THIS_MODULE,
        .num_links = 1,
};

static int davinci_evm_probe(struct platform_device *pdev)
{
        struct device_node *np = pdev->dev.of_node;
        struct snd_soc_dai_link *dai;
        struct snd_soc_card_drvdata_davinci *drvdata = NULL;
        struct clk *mclk;
        int ret = 0;

        dai = (struct snd_soc_dai_link *) device_get_match_data(&pdev->dev);
        if (!dai) {
                dev_err(&pdev->dev, "Error: No device match found\n");
                return -ENODEV;
        }

        evm_soc_card.dai_link = dai;

        dai->codecs->of_node = of_parse_phandle(np, "ti,audio-codec", 0);
        if (!dai->codecs->of_node)
                return -EINVAL;

        dai->cpus->of_node = of_parse_phandle(np, "ti,mcasp-controller", 0);
        if (!dai->cpus->of_node) {
                ret = -EINVAL;
                goto err_put;
        }

        dai->platforms->of_node = dai->cpus->of_node;

        evm_soc_card.dev = &pdev->dev;
        ret = snd_soc_of_parse_card_name(&evm_soc_card, "ti,model");
        if (ret)
                goto err_put;

        mclk = devm_clk_get(&pdev->dev, "mclk");
        if (PTR_ERR(mclk) == -EPROBE_DEFER) {
                ret = -EPROBE_DEFER;
                goto err_put;
        } else if (IS_ERR(mclk)) {
                dev_dbg(&pdev->dev, "mclk not found.\n");
                mclk = NULL;
        }

        drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
        if (!drvdata) {
                ret = -ENOMEM;
                goto err_put;
        }

        drvdata->mclk = mclk;

        ret = of_property_read_u32(np, "ti,codec-clock-rate", &drvdata->sysclk);

        if (ret < 0) {
                if (!drvdata->mclk) {
                        dev_err(&pdev->dev,
                                "No clock or clock rate defined.\n");
                        ret = -EINVAL;
                        goto err_put;
                }
                drvdata->sysclk = clk_get_rate(drvdata->mclk);
        } else if (drvdata->mclk) {
                unsigned int requestd_rate = drvdata->sysclk;
                clk_set_rate(drvdata->mclk, drvdata->sysclk);
                drvdata->sysclk = clk_get_rate(drvdata->mclk);
                if (drvdata->sysclk != requestd_rate)
                        dev_warn(&pdev->dev,
                                 "Could not get requested rate %u using %u.\n",
                                 requestd_rate, drvdata->sysclk);
        }

        snd_soc_card_set_drvdata(&evm_soc_card, drvdata);
        ret = devm_snd_soc_register_card(&pdev->dev, &evm_soc_card);

        if (ret) {
                dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
                goto err_put;
        }

        return ret;

err_put:
        dai->platforms->of_node = NULL;

        if (dai->cpus->of_node) {
                of_node_put(dai->cpus->of_node);
                dai->cpus->of_node = NULL;
        }

        if (dai->codecs->of_node) {
                of_node_put(dai->codecs->of_node);
                dai->codecs->of_node = NULL;
        }

        return ret;
}

static struct platform_driver davinci_evm_driver = {
        .probe          = davinci_evm_probe,
        .driver         = {
                .name   = "davinci_evm",
                .pm     = &snd_soc_pm_ops,
                .of_match_table = davinci_evm_dt_ids,
        },
};

module_platform_driver(davinci_evm_driver);

MODULE_AUTHOR("Vladimir Barinov");
MODULE_DESCRIPTION("TI DAVINCI EVM ASoC driver");
MODULE_LICENSE("GPL");