/*
 *  bytcht-da7213.c - ASoc Machine driver for Intel Baytrail and
 *             Cherrytrail-based platforms, with Dialog DA7213 codec
 *
 *  Copyright (C) 2017 Intel Corporation
 *  Author: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
 *
 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; version 2 of the License.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <asm/platform_sst_audio.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include "../../codecs/da7213.h"
#include "../atom/sst-atom-controls.h"
#include "../common/sst-acpi.h"

static const struct snd_kcontrol_new controls[] = {
        SOC_DAPM_PIN_SWITCH("Headphone Jack"),
        SOC_DAPM_PIN_SWITCH("Headset Mic"),
        SOC_DAPM_PIN_SWITCH("Mic"),
        SOC_DAPM_PIN_SWITCH("Aux In"),
};

static const struct snd_soc_dapm_widget dapm_widgets[] = {
        SND_SOC_DAPM_HP("Headphone Jack", NULL),
        SND_SOC_DAPM_MIC("Headset Mic", NULL),
        SND_SOC_DAPM_MIC("Mic", NULL),
        SND_SOC_DAPM_LINE("Aux In", NULL),
};

static const struct snd_soc_dapm_route audio_map[] = {
        {"Headphone Jack", NULL, "HPL"},
        {"Headphone Jack", NULL, "HPR"},

        {"AUXL", NULL, "Aux In"},
        {"AUXR", NULL, "Aux In"},

        /* Assume Mic1 is linked to Headset and Mic2 to on-board mic */
        {"MIC1", NULL, "Headset Mic"},
        {"MIC2", NULL, "Mic"},

        /* SOC-codec link */
        {"ssp2 Tx", NULL, "codec_out0"},
        {"ssp2 Tx", NULL, "codec_out1"},
        {"codec_in0", NULL, "ssp2 Rx"},
        {"codec_in1", NULL, "ssp2 Rx"},

        {"Playback", NULL, "ssp2 Tx"},
        {"ssp2 Rx", NULL, "Capture"},
};

static int codec_fixup(struct snd_soc_pcm_runtime *rtd,
                       struct snd_pcm_hw_params *params)
{
        int ret;
        struct snd_interval *rate = hw_param_interval(params,
                        SNDRV_PCM_HW_PARAM_RATE);
        struct snd_interval *channels = hw_param_interval(params,
                                                SNDRV_PCM_HW_PARAM_CHANNELS);

        /* The DSP will convert the FE rate to 48k, stereo, 24bits */
        rate->min = rate->max = 48000;
        channels->min = channels->max = 2;

        /* set SSP2 to 24-bit */
        params_set_format(params, SNDRV_PCM_FORMAT_S24_LE);

        /*
         * Default mode for SSP configuration is TDM 4 slot, override config
         * with explicit setting to I2S 2ch 24-bit. The word length is set with
         * dai_set_tdm_slot() since there is no other API exposed
         */
        ret = snd_soc_dai_set_fmt(rtd->cpu_dai,
                                  SND_SOC_DAIFMT_I2S     |
                                  SND_SOC_DAIFMT_NB_NF   |
                                  SND_SOC_DAIFMT_CBS_CFS);
        if (ret < 0) {
                dev_err(rtd->dev, "can't set format to I2S, err %d\n", ret);
                return ret;
        }

        ret = snd_soc_dai_set_tdm_slot(rtd->cpu_dai, 0x3, 0x3, 2, 24);
        if (ret < 0) {
                dev_err(rtd->dev, "can't set I2S config, err %d\n", ret);
                return ret;
        }

        return 0;
}

static int aif1_startup(struct snd_pcm_substream *substream)
{
        return snd_pcm_hw_constraint_single(substream->runtime,
                        SNDRV_PCM_HW_PARAM_RATE, 48000);
}

static int aif1_hw_params(struct snd_pcm_substream *substream,
                          struct snd_pcm_hw_params *params)
{
        struct snd_soc_pcm_runtime *rtd = substream->private_data;
        struct snd_soc_dai *codec_dai = rtd->codec_dai;
        int ret;

        ret = snd_soc_dai_set_sysclk(codec_dai, DA7213_CLKSRC_MCLK,
                                     19200000, SND_SOC_CLOCK_IN);
        if (ret < 0)
                dev_err(codec_dai->dev, "can't set codec sysclk configuration\n");

        ret = snd_soc_dai_set_pll(codec_dai, 0,
                        DA7213_SYSCLK_PLL_SRM, 0, DA7213_PLL_FREQ_OUT_98304000);
        if (ret < 0) {
                dev_err(codec_dai->dev, "failed to start PLL: %d\n", ret);
                return -EIO;
        }

        return ret;
}

static int aif1_hw_free(struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = substream->private_data;
        struct snd_soc_dai *codec_dai = rtd->codec_dai;
        int ret;

        ret = snd_soc_dai_set_pll(codec_dai, 0,
                                  DA7213_SYSCLK_MCLK, 0, 0);
        if (ret < 0) {
                dev_err(codec_dai->dev, "failed to stop PLL: %d\n", ret);
                return -EIO;
        }

        return ret;
}

static const struct snd_soc_ops aif1_ops = {
        .startup = aif1_startup,
};

static const struct snd_soc_ops ssp2_ops = {
        .hw_params = aif1_hw_params,
        .hw_free = aif1_hw_free,

};

static struct snd_soc_dai_link dailink[] = {
        [MERR_DPCM_AUDIO] = {
                .name = "Audio Port",
                .stream_name = "Audio",
                .cpu_dai_name = "media-cpu-dai",
                .codec_dai_name = "snd-soc-dummy-dai",
                .codec_name = "snd-soc-dummy",
                .platform_name = "sst-mfld-platform",
                .nonatomic = true,
                .dynamic = 1,
                .dpcm_playback = 1,
                .dpcm_capture = 1,
                .ops = &aif1_ops,
        },
        [MERR_DPCM_DEEP_BUFFER] = {
                .name = "Deep-Buffer Audio Port",
                .stream_name = "Deep-Buffer Audio",
                .cpu_dai_name = "deepbuffer-cpu-dai",
                .codec_dai_name = "snd-soc-dummy-dai",
                .codec_name = "snd-soc-dummy",
                .platform_name = "sst-mfld-platform",
                .nonatomic = true,
                .dynamic = 1,
                .dpcm_playback = 1,
                .ops = &aif1_ops,
        },
        [MERR_DPCM_COMPR] = {
                .name = "Compressed Port",
                .stream_name = "Compress",
                .cpu_dai_name = "compress-cpu-dai",
                .codec_dai_name = "snd-soc-dummy-dai",
                .codec_name = "snd-soc-dummy",
                .platform_name = "sst-mfld-platform",
        },
        /* CODEC<->CODEC link */
        /* back ends */
        {
                .name = "SSP2-Codec",
                .id = 1,
                .cpu_dai_name = "ssp2-port",
                .platform_name = "sst-mfld-platform",
                .no_pcm = 1,
                .codec_dai_name = "da7213-hifi",
                .codec_name = "i2c-DLGS7213:00",
                .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
                                                | SND_SOC_DAIFMT_CBS_CFS,
                .be_hw_params_fixup = codec_fixup,
                .nonatomic = true,
                .dpcm_playback = 1,
                .dpcm_capture = 1,
                .ops = &ssp2_ops,
        },
};

/* SoC card */
static struct snd_soc_card bytcht_da7213_card = {
        .name = "bytcht-da7213",
        .owner = THIS_MODULE,
        .dai_link = dailink,
        .num_links = ARRAY_SIZE(dailink),
        .controls = controls,
        .num_controls = ARRAY_SIZE(controls),
        .dapm_widgets = dapm_widgets,
        .num_dapm_widgets = ARRAY_SIZE(dapm_widgets),
        .dapm_routes = audio_map,
        .num_dapm_routes = ARRAY_SIZE(audio_map),
};

static char codec_name[16]; /* i2c-<HID>:00 with HID being 8 chars */

static int bytcht_da7213_probe(struct platform_device *pdev)
{
        int ret_val = 0;
        int i;
        struct snd_soc_card *card;
        struct sst_acpi_mach *mach;
        const char *i2c_name = NULL;
        int dai_index = 0;

        mach = (&pdev->dev)->platform_data;
        card = &bytcht_da7213_card;
        card->dev = &pdev->dev;

        /* fix index of codec dai */
        dai_index = MERR_DPCM_COMPR + 1;
        for (i = 0; i < ARRAY_SIZE(dailink); i++) {
                if (!strcmp(dailink[i].codec_name, "i2c-DLGS7213:00")) {
                        dai_index = i;
                        break;
                }
        }

        /* fixup codec name based on HID */
        i2c_name = sst_acpi_find_name_from_hid(mach->id);
        if (i2c_name != NULL) {
                snprintf(codec_name, sizeof(codec_name),
                        "%s%s", "i2c-", i2c_name);
                dailink[dai_index].codec_name = codec_name;
        }

        ret_val = devm_snd_soc_register_card(&pdev->dev, card);
        if (ret_val) {
                dev_err(&pdev->dev,
                        "snd_soc_register_card failed %d\n", ret_val);
                return ret_val;
        }
        platform_set_drvdata(pdev, card);
        return ret_val;
}

static struct platform_driver bytcht_da7213_driver = {
        .driver = {
                .name = "bytcht_da7213",
        },
        .probe = bytcht_da7213_probe,
};
module_platform_driver(bytcht_da7213_driver);

MODULE_DESCRIPTION("ASoC Intel(R) Baytrail/Cherrytrail+DA7213 Machine driver");
MODULE_AUTHOR("Pierre-Louis Bossart");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:bytcht_da7213");