// SPDX-License-Identifier: GPL-2.0+
//
// rx1950.c - ALSA SoC Audio Layer
//
// Copyright (c) 2010 Vasily Khoruzhick <anarsoul@gmail.com>
//
// Based on smdk2440.c and magician.c
//
// Authors: Graeme Gregory graeme.gregory@wolfsonmicro.com
//          Philipp Zabel <philipp.zabel@gmail.com>
//          Denis Grigoriev <dgreenday@gmail.com>
//          Vasily Khoruzhick <anarsoul@gmail.com>

#include <linux/types.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>

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

#include "regs-iis.h"
#include "s3c24xx-i2s.h"

static int rx1950_uda1380_init(struct snd_soc_pcm_runtime *rtd);
static int rx1950_startup(struct snd_pcm_substream *substream);
static int rx1950_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params);
static int rx1950_spk_power(struct snd_soc_dapm_widget *w,
				struct snd_kcontrol *kcontrol, int event);

static const unsigned int rates[] = {
	16000,
	44100,
	48000,
};

static const struct snd_pcm_hw_constraint_list hw_rates = {
	.count = ARRAY_SIZE(rates),
	.list = rates,
};

static struct snd_soc_jack hp_jack;

static struct snd_soc_jack_pin hp_jack_pins[] = {
	{
		.pin	= "Headphone Jack",
		.mask	= SND_JACK_HEADPHONE,
	},
	{
		.pin	= "Speaker",
		.mask	= SND_JACK_HEADPHONE,
		.invert	= 1,
	},
};

static struct snd_soc_jack_gpio hp_jack_gpios[] = {
	[0] = {
		.name			= "hp-gpio",
		.report			= SND_JACK_HEADPHONE,
		.invert			= 1,
		.debounce_time		= 200,
	},
};

static struct snd_soc_ops rx1950_ops = {
	.startup	= rx1950_startup,
	.hw_params	= rx1950_hw_params,
};

/* s3c24xx digital audio interface glue - connects codec <--> CPU */
SND_SOC_DAILINK_DEFS(uda1380,
	DAILINK_COMP_ARRAY(COMP_CPU("s3c24xx-iis")),
	DAILINK_COMP_ARRAY(COMP_CODEC("uda1380-codec.0-001a",
				      "uda1380-hifi")),
	DAILINK_COMP_ARRAY(COMP_PLATFORM("s3c24xx-iis")));

static struct snd_soc_dai_link rx1950_uda1380_dai[] = {
	{
		.name		= "uda1380",
		.stream_name	= "UDA1380 Duplex",
		.init		= rx1950_uda1380_init,
		.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
				  SND_SOC_DAIFMT_CBS_CFS,
		.ops		= &rx1950_ops,
		SND_SOC_DAILINK_REG(uda1380),
	},
};

/* rx1950 machine dapm widgets */
static const struct snd_soc_dapm_widget uda1380_dapm_widgets[] = {
	SND_SOC_DAPM_HP("Headphone Jack", NULL),
	SND_SOC_DAPM_MIC("Mic Jack", NULL),
	SND_SOC_DAPM_SPK("Speaker", rx1950_spk_power),
};

/* rx1950 machine audio_map */
static const struct snd_soc_dapm_route audio_map[] = {
	/* headphone connected to VOUTLHP, VOUTRHP */
	{"Headphone Jack", NULL, "VOUTLHP"},
	{"Headphone Jack", NULL, "VOUTRHP"},

	/* ext speaker connected to VOUTL, VOUTR  */
	{"Speaker", NULL, "VOUTL"},
	{"Speaker", NULL, "VOUTR"},

	/* mic is connected to VINM */
	{"VINM", NULL, "Mic Jack"},
};

static struct snd_soc_card rx1950_asoc = {
	.name = "rx1950",
	.owner = THIS_MODULE,
	.dai_link = rx1950_uda1380_dai,
	.num_links = ARRAY_SIZE(rx1950_uda1380_dai),

	.dapm_widgets = uda1380_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(uda1380_dapm_widgets),
	.dapm_routes = audio_map,
	.num_dapm_routes = ARRAY_SIZE(audio_map),
};

static int rx1950_startup(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;

	return snd_pcm_hw_constraint_list(runtime, 0,
					SNDRV_PCM_HW_PARAM_RATE,
					&hw_rates);
}

static struct gpio_desc *gpiod_speaker_power;

static int rx1950_spk_power(struct snd_soc_dapm_widget *w,
				struct snd_kcontrol *kcontrol, int event)
{
	if (SND_SOC_DAPM_EVENT_ON(event))
		gpiod_set_value(gpiod_speaker_power, 1);
	else
		gpiod_set_value(gpiod_speaker_power, 0);

	return 0;
}

static int rx1950_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
	int div;
	int ret;
	unsigned int rate = params_rate(params);
	int clk_source, fs_mode;

	switch (rate) {
	case 16000:
	case 48000:
		clk_source = S3C24XX_CLKSRC_PCLK;
		fs_mode = S3C2410_IISMOD_256FS;
		div = s3c24xx_i2s_get_clockrate() / (256 * rate);
		if (s3c24xx_i2s_get_clockrate() % (256 * rate) > (128 * rate))
			div++;
		break;
	case 44100:
	case 88200:
		clk_source = S3C24XX_CLKSRC_MPLL;
		fs_mode = S3C2410_IISMOD_384FS;
		div = 1;
		break;
	default:
		printk(KERN_ERR "%s: rate %d is not supported\n",
			__func__, rate);
		return -EINVAL;
	}

	/* select clock source */
	ret = snd_soc_dai_set_sysclk(cpu_dai, clk_source, rate,
			SND_SOC_CLOCK_OUT);
	if (ret < 0)
		return ret;

	/* set MCLK division for sample rate */
	ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_MCLK,
		fs_mode);
	if (ret < 0)
		return ret;

	/* set BCLK division for sample rate */
	ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_BCLK,
		S3C2410_IISMOD_32FS);
	if (ret < 0)
		return ret;

	/* set prescaler division for sample rate */
	ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER,
		S3C24XX_PRESCALE(div, div));
	if (ret < 0)
		return ret;

	return 0;
}

static int rx1950_uda1380_init(struct snd_soc_pcm_runtime *rtd)
{
	snd_soc_card_jack_new(rtd->card, "Headphone Jack", SND_JACK_HEADPHONE,
		&hp_jack, hp_jack_pins, ARRAY_SIZE(hp_jack_pins));

	snd_soc_jack_add_gpios(&hp_jack, ARRAY_SIZE(hp_jack_gpios),
		hp_jack_gpios);

	return 0;
}

static int rx1950_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;

	/* configure some gpios */
	gpiod_speaker_power = devm_gpiod_get(dev, "speaker-power", GPIOD_OUT_LOW);
	if (IS_ERR(gpiod_speaker_power)) {
		dev_err(dev, "cannot get gpio\n");
		return PTR_ERR(gpiod_speaker_power);
	}

	hp_jack_gpios[0].gpiod_dev = dev;
	rx1950_asoc.dev = dev;

	return devm_snd_soc_register_card(dev, &rx1950_asoc);
}

static struct platform_driver rx1950_audio = {
	.driver = {
		.name = "rx1950-audio",
		.pm = &snd_soc_pm_ops,
	},
	.probe = rx1950_probe,
};

module_platform_driver(rx1950_audio);

/* Module information */
MODULE_AUTHOR("Vasily Khoruzhick");
MODULE_DESCRIPTION("ALSA SoC RX1950");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rx1950-audio");
