// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
 *
 * storm.c -- ALSA SoC machine driver for QTi ipq806x-based Storm board
 */

#include <linux/device.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#define STORM_SYSCLK_MULT                       4

static int storm_ops_hw_params(struct snd_pcm_substream *substream,
                struct snd_pcm_hw_params *params)
{
        struct snd_soc_pcm_runtime *soc_runtime = snd_soc_substream_to_rtd(substream);
        struct snd_soc_card *card = soc_runtime->card;
        snd_pcm_format_t format = params_format(params);
        unsigned int rate = params_rate(params);
        unsigned int sysclk_freq;
        int bitwidth, ret;

        bitwidth = snd_pcm_format_width(format);
        if (bitwidth < 0) {
                dev_err(card->dev, "invalid bit width given: %d\n", bitwidth);
                return bitwidth;
        }

        /*
         * as the CPU DAI is the I2S bus master and no system clock is needed by
         * the MAX98357a DAC, simply set the system clock to be a constant
         * multiple of the bit clock for the clock divider
         */
        sysclk_freq = rate * bitwidth * 2 * STORM_SYSCLK_MULT;

        ret = snd_soc_dai_set_sysclk(snd_soc_rtd_to_cpu(soc_runtime, 0), 0, sysclk_freq, 0);
        if (ret) {
                dev_err(card->dev, "error setting sysclk to %u: %d\n",
                        sysclk_freq, ret);
                return ret;
        }

        return 0;
}

static const struct snd_soc_ops storm_soc_ops = {
        .hw_params      = storm_ops_hw_params,
};

SND_SOC_DAILINK_DEFS(hifi,
        DAILINK_COMP_ARRAY(COMP_EMPTY()),
        DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "HiFi")),
        DAILINK_COMP_ARRAY(COMP_EMPTY()));

static struct snd_soc_dai_link storm_dai_link = {
        .name           = "Primary",
        .stream_name    = "Primary",
        .ops            = &storm_soc_ops,
        SND_SOC_DAILINK_REG(hifi),
};

static int storm_parse_of(struct snd_soc_card *card)
{
        struct snd_soc_dai_link *dai_link = card->dai_link;
        struct device_node *np = card->dev->of_node;

        dai_link->cpus->of_node = of_parse_phandle(np, "cpu", 0);
        if (!dai_link->cpus->of_node) {
                dev_err(card->dev, "error getting cpu phandle\n");
                return -EINVAL;
        }
        dai_link->platforms->of_node = dai_link->cpus->of_node;

        dai_link->codecs->of_node = of_parse_phandle(np, "codec", 0);
        if (!dai_link->codecs->of_node) {
                dev_err(card->dev, "error getting codec phandle\n");
                return -EINVAL;
        }

        return 0;
}

static int storm_platform_probe(struct platform_device *pdev)
{
        struct snd_soc_card *card;
        int ret;

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

        card->dev = &pdev->dev;
        card->owner = THIS_MODULE;

        ret = snd_soc_of_parse_card_name(card, "qcom,model");
        if (ret) {
                dev_err(&pdev->dev, "error parsing card name: %d\n", ret);
                return ret;
        }

        card->dai_link  = &storm_dai_link;
        card->num_links = 1;

        ret = storm_parse_of(card);
        if (ret) {
                dev_err(&pdev->dev, "error resolving dai links: %d\n", ret);
                return ret;
        }

        ret = devm_snd_soc_register_card(&pdev->dev, card);
        if (ret)
                dev_err(&pdev->dev, "error registering soundcard: %d\n", ret);

        return ret;

}

#ifdef CONFIG_OF
static const struct of_device_id storm_device_id[]  = {
        { .compatible = "google,storm-audio" },
        {},
};
MODULE_DEVICE_TABLE(of, storm_device_id);
#endif

static struct platform_driver storm_platform_driver = {
        .driver = {
                .name = "storm-audio",
                .of_match_table =
                        of_match_ptr(storm_device_id),
        },
        .probe = storm_platform_probe,
};
module_platform_driver(storm_platform_driver);

MODULE_DESCRIPTION("QTi IPQ806x-based Storm Machine Driver");
MODULE_LICENSE("GPL");