// SPDX-License-Identifier: GPL-2.0
//
// ALSA SoC driver for Migo-R
//
// Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>

#include <linux/clkdev.h>
#include <linux/device.h>
#include <linux/firmware.h>
#include <linux/module.h>

#include <asm/clock.h>

#include <cpu/sh7722.h>

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

#include "../codecs/wm8978.h"
#include "siu.h"

/* Default 8000Hz sampling frequency */
static unsigned long codec_freq = 8000 * 512;

static unsigned int use_count;

/* External clock, sourced from the codec at the SIUMCKB pin */
static unsigned long siumckb_recalc(struct clk *clk)
{
        return codec_freq;
}

static struct sh_clk_ops siumckb_clk_ops = {
        .recalc = siumckb_recalc,
};

static struct clk siumckb_clk = {
        .ops            = &siumckb_clk_ops,
        .rate           = 0, /* initialised at run-time */
};

static struct clk_lookup *siumckb_lookup;

static int migor_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);
        int ret;
        unsigned int rate = params_rate(params);

        ret = snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 13000000,
                                     SND_SOC_CLOCK_IN);
        if (ret < 0)
                return ret;

        ret = snd_soc_dai_set_clkdiv(codec_dai, WM8978_OPCLKRATE, rate * 512);
        if (ret < 0)
                return ret;

        codec_freq = rate * 512;
        /*
         * This propagates the parent frequency change to children and
         * recalculates the frequency table
         */
        clk_set_rate(&siumckb_clk, codec_freq);
        dev_dbg(codec_dai->dev, "%s: configure %luHz\n", __func__, codec_freq);

        ret = snd_soc_dai_set_sysclk(snd_soc_rtd_to_cpu(rtd, 0), SIU_CLKB_EXT,
                                     codec_freq / 2, SND_SOC_CLOCK_IN);

        if (!ret)
                use_count++;

        return ret;
}

static int migor_hw_free(struct snd_pcm_substream *substream)
{
        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);

        if (use_count) {
                use_count--;

                if (!use_count)
                        snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 0,
                                               SND_SOC_CLOCK_IN);
        } else {
                dev_dbg(codec_dai->dev, "Unbalanced hw_free!\n");
        }

        return 0;
}

static const struct snd_soc_ops migor_dai_ops = {
        .hw_params = migor_hw_params,
        .hw_free = migor_hw_free,
};

static const struct snd_soc_dapm_widget migor_dapm_widgets[] = {
        SND_SOC_DAPM_HP("Headphone", NULL),
        SND_SOC_DAPM_MIC("Onboard Microphone", NULL),
        SND_SOC_DAPM_MIC("External Microphone", NULL),
};

static const struct snd_soc_dapm_route audio_map[] = {
        /* Headphone output connected to LHP/RHP, enable OUT4 for VMID */
        { "Headphone", NULL,  "OUT4 VMID" },
        { "OUT4 VMID", NULL,  "LHP" },
        { "OUT4 VMID", NULL,  "RHP" },

        /* On-board microphone */
        { "RMICN", NULL, "Mic Bias" },
        { "RMICP", NULL, "Mic Bias" },
        { "Mic Bias", NULL, "Onboard Microphone" },

        /* External microphone */
        { "LMICN", NULL, "Mic Bias" },
        { "LMICP", NULL, "Mic Bias" },
        { "Mic Bias", NULL, "External Microphone" },
};

/* migor digital audio interface glue - connects codec <--> CPU */
SND_SOC_DAILINK_DEFS(wm8978,
        DAILINK_COMP_ARRAY(COMP_CPU("siu-pcm-audio")),
        DAILINK_COMP_ARRAY(COMP_CODEC("wm8978.0-001a", "wm8978-hifi")),
        DAILINK_COMP_ARRAY(COMP_PLATFORM("siu-pcm-audio")));

static struct snd_soc_dai_link migor_dai = {
        .name = "wm8978",
        .stream_name = "WM8978",
        .dai_fmt = SND_SOC_DAIFMT_NB_IF | SND_SOC_DAIFMT_I2S |
                   SND_SOC_DAIFMT_CBC_CFC,
        .ops = &migor_dai_ops,
        SND_SOC_DAILINK_REG(wm8978),
};

/* migor audio machine driver */
static struct snd_soc_card snd_soc_migor = {
        .name = "Migo-R",
        .owner = THIS_MODULE,
        .dai_link = &migor_dai,
        .num_links = 1,

        .dapm_widgets = migor_dapm_widgets,
        .num_dapm_widgets = ARRAY_SIZE(migor_dapm_widgets),
        .dapm_routes = audio_map,
        .num_dapm_routes = ARRAY_SIZE(audio_map),
};

static struct platform_device *migor_snd_device;

static int __init migor_init(void)
{
        int ret;

        ret = clk_register(&siumckb_clk);
        if (ret < 0)
                return ret;

        siumckb_lookup = clkdev_create(&siumckb_clk, "siumckb_clk", NULL);
        if (!siumckb_lookup) {
                ret = -ENOMEM;
                goto eclkdevalloc;
        }

        /* Port number used on this machine: port B */
        migor_snd_device = platform_device_alloc("soc-audio", 1);
        if (!migor_snd_device) {
                ret = -ENOMEM;
                goto epdevalloc;
        }

        platform_set_drvdata(migor_snd_device, &snd_soc_migor);

        ret = platform_device_add(migor_snd_device);
        if (ret)
                goto epdevadd;

        return 0;

epdevadd:
        platform_device_put(migor_snd_device);
epdevalloc:
        clkdev_drop(siumckb_lookup);
eclkdevalloc:
        clk_unregister(&siumckb_clk);
        return ret;
}

static void __exit migor_exit(void)
{
        clkdev_drop(siumckb_lookup);
        clk_unregister(&siumckb_clk);
        platform_device_unregister(migor_snd_device);
}

module_init(migor_init);
module_exit(migor_exit);

MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
MODULE_DESCRIPTION("ALSA SoC Migor");
MODULE_LICENSE("GPL v2");