nau8825.c

// SPDX-License-Identifier: GPL-2.0-only
//
// Copyright(c) 2021-2022 Intel Corporation
//
// Authors: Cezary Rojewski <[email protected]>
//          Amadeusz Slawinski <[email protected]>
//

#include <linux/input.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <sound/core.h>
#include <sound/jack.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-acpi.h>
#include "../../../codecs/nau8825.h"
#include "../utils.h"

#define SKL_NUVOTON_CODEC_DAI	"nau8825-hifi"

static int
avs_nau8825_clock_control(struct snd_soc_dapm_widget *w, struct snd_kcontrol *control, int event)
{
	struct snd_soc_card *card = snd_soc_dapm_to_card(w->dapm);
	struct snd_soc_dai *codec_dai;
	int ret;

	codec_dai = snd_soc_card_get_codec_dai(card, SKL_NUVOTON_CODEC_DAI);
	if (!codec_dai) {
		dev_err(card->dev, "Codec dai not found\n");
		return -EINVAL;
	}

	if (SND_SOC_DAPM_EVENT_ON(event))
		ret = snd_soc_dai_set_sysclk(codec_dai, NAU8825_CLK_MCLK, 24000000,
					     SND_SOC_CLOCK_IN);
	else
		ret = snd_soc_dai_set_sysclk(codec_dai, NAU8825_CLK_INTERNAL, 0, SND_SOC_CLOCK_IN);
	if (ret < 0)
		dev_err(card->dev, "Set sysclk failed: %d\n", ret);

	return ret;
}

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

static const struct snd_soc_dapm_widget card_widgets[] = {
	SND_SOC_DAPM_HP("Headphone Jack", NULL),
	SND_SOC_DAPM_MIC("Headset Mic", NULL),
	SND_SOC_DAPM_SUPPLY("Platform Clock", SND_SOC_NOPM, 0, 0, avs_nau8825_clock_control,
			    SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
};

static const struct snd_soc_dapm_route card_base_routes[] = {
	{ "Headphone Jack", NULL, "HPOL" },
	{ "Headphone Jack", NULL, "HPOR" },

	{ "MIC", NULL, "Headset Mic" },

	{ "Headphone Jack", NULL, "Platform Clock" },
	{ "Headset Mic", NULL, "Platform Clock" },
};

static const struct snd_soc_jack_pin card_headset_pins[] = {
	{
		.pin = "Headphone Jack",
		.mask = SND_JACK_HEADPHONE,
	},
	{
		.pin = "Headset Mic",
		.mask = SND_JACK_MICROPHONE,
	},
};

static int avs_nau8825_codec_init(struct snd_soc_pcm_runtime *runtime)
{
	struct snd_soc_card *card = runtime->card;
	struct snd_soc_jack_pin *pins;
	struct snd_soc_jack *jack;
	int num_pins, ret;

	jack = snd_soc_card_get_drvdata(card);
	num_pins = ARRAY_SIZE(card_headset_pins);

	pins = devm_kmemdup_array(card->dev, card_headset_pins, num_pins,
				  sizeof(card_headset_pins[0]), GFP_KERNEL);
	if (!pins)
		return -ENOMEM;

	/*
	 * 4 buttons here map to the google Reference headset.
	 * The use of these buttons can be decided by the user space.
	 */
	ret = snd_soc_card_jack_new_pins(card, "Headset Jack", SND_JACK_HEADSET | SND_JACK_BTN_0 |
					 SND_JACK_BTN_1 | SND_JACK_BTN_2 | SND_JACK_BTN_3,
					 jack, pins, num_pins);
	if (ret)
		return ret;

	snd_jack_set_key(jack->jack, SND_JACK_BTN_0, KEY_PLAYPAUSE);
	snd_jack_set_key(jack->jack, SND_JACK_BTN_1, KEY_VOICECOMMAND);
	snd_jack_set_key(jack->jack, SND_JACK_BTN_2, KEY_VOLUMEUP);
	snd_jack_set_key(jack->jack, SND_JACK_BTN_3, KEY_VOLUMEDOWN);

	return snd_soc_component_set_jack(snd_soc_rtd_to_codec(runtime, 0)->component, jack, NULL);
}

static void avs_nau8825_codec_exit(struct snd_soc_pcm_runtime *rtd)
{
	snd_soc_component_set_jack(snd_soc_rtd_to_codec(rtd, 0)->component, NULL, NULL);
}

static int
avs_nau8825_be_fixup(struct snd_soc_pcm_runtime *runtime, struct snd_pcm_hw_params *params)
{
	struct snd_interval *rate, *channels;
	struct snd_mask *fmt;

	rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);

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

	/* set SSP to 24 bit */
	snd_mask_none(fmt);
	snd_mask_set_format(fmt, SNDRV_PCM_FORMAT_S24_LE);

	return 0;
}

static int avs_nau8825_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *rtm = snd_soc_substream_to_rtd(substream);
	struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtm, 0);
	int ret = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		ret = snd_soc_dai_set_sysclk(codec_dai, NAU8825_CLK_FLL_FS, 0, SND_SOC_CLOCK_IN);
		if (ret < 0) {
			dev_err(codec_dai->dev, "can't set FS clock %d\n", ret);
			break;
		}

		ret = snd_soc_dai_set_pll(codec_dai, 0, 0, runtime->rate, runtime->rate * 256);
		if (ret < 0)
			dev_err(codec_dai->dev, "can't set FLL: %d\n", ret);
		break;

	case SNDRV_PCM_TRIGGER_RESUME:
		ret = snd_soc_dai_set_pll(codec_dai, 0, 0, runtime->rate, runtime->rate * 256);
		if (ret < 0)
			dev_err(codec_dai->dev, "can't set FLL: %d\n", ret);
		break;
	}

	return ret;
}


static const struct snd_soc_ops avs_nau8825_ops = {
	.trigger = avs_nau8825_trigger,
};

static int avs_create_dai_link(struct device *dev, int ssp_port, int tdm_slot,
			       struct snd_soc_dai_link **dai_link)
{
	struct snd_soc_dai_link_component *platform;
	struct snd_soc_dai_link *dl;

	dl = devm_kzalloc(dev, sizeof(*dl), GFP_KERNEL);
	platform = devm_kzalloc(dev, sizeof(*platform), GFP_KERNEL);
	if (!dl || !platform)
		return -ENOMEM;

	dl->name = devm_kasprintf(dev, GFP_KERNEL,
				  AVS_STRING_FMT("SSP", "-Codec", ssp_port, tdm_slot));
	dl->cpus = devm_kzalloc(dev, sizeof(*dl->cpus), GFP_KERNEL);
	dl->codecs = devm_kzalloc(dev, sizeof(*dl->codecs), GFP_KERNEL);
	if (!dl->name || !dl->cpus || !dl->codecs)
		return -ENOMEM;

	dl->cpus->dai_name = devm_kasprintf(dev, GFP_KERNEL,
					    AVS_STRING_FMT("SSP", " Pin", ssp_port, tdm_slot));
	dl->codecs->name = devm_kasprintf(dev, GFP_KERNEL, "i2c-10508825:00");
	dl->codecs->dai_name = devm_kasprintf(dev, GFP_KERNEL, SKL_NUVOTON_CODEC_DAI);
	if (!dl->cpus->dai_name || !dl->codecs->name || !dl->codecs->dai_name)
		return -ENOMEM;

	platform->name = dev_name(dev);
	dl->num_cpus = 1;
	dl->num_codecs = 1;
	dl->platforms = platform;
	dl->num_platforms = 1;
	dl->id = 0;
	dl->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBC_CFC;
	dl->init = avs_nau8825_codec_init;
	dl->exit = avs_nau8825_codec_exit;
	dl->be_hw_params_fixup = avs_nau8825_be_fixup;
	dl->ops = &avs_nau8825_ops;
	dl->nonatomic = 1;
	dl->no_pcm = 1;

	*dai_link = dl;

	return 0;
}

static int avs_card_suspend_pre(struct snd_soc_card *card)
{
	struct snd_soc_dai *codec_dai = snd_soc_card_get_codec_dai(card, SKL_NUVOTON_CODEC_DAI);

	return snd_soc_component_set_jack(codec_dai->component, NULL, NULL);
}

static int avs_card_resume_post(struct snd_soc_card *card)
{
	struct snd_soc_dai *codec_dai = snd_soc_card_get_codec_dai(card, SKL_NUVOTON_CODEC_DAI);
	struct snd_soc_jack *jack = snd_soc_card_get_drvdata(card);
	int stream = SNDRV_PCM_STREAM_PLAYBACK;

	if (!codec_dai) {
		dev_err(card->dev, "Codec dai not found\n");
		return -EINVAL;
	}

	if (snd_soc_dai_stream_active(codec_dai, stream) &&
	    snd_soc_dai_get_widget(codec_dai, stream)->active)
		snd_soc_dai_set_sysclk(codec_dai, NAU8825_CLK_FLL_FS, 0, SND_SOC_CLOCK_IN);

	return snd_soc_component_set_jack(codec_dai->component, jack, NULL);
}

static int avs_nau8825_probe(struct platform_device *pdev)
{
	struct snd_soc_dai_link *dai_link;
	struct snd_soc_acpi_mach *mach;
	struct avs_mach_pdata *pdata;
	struct snd_soc_card *card;
	struct snd_soc_jack *jack;
	struct device *dev = &pdev->dev;
	int ssp_port, tdm_slot, ret;

	mach = dev_get_platdata(dev);
	pdata = mach->pdata;

	ret = avs_mach_get_ssp_tdm(dev, mach, &ssp_port, &tdm_slot);
	if (ret)
		return ret;

	ret = avs_create_dai_link(dev, ssp_port, tdm_slot, &dai_link);
	if (ret) {
		dev_err(dev, "Failed to create dai link: %d", ret);
		return ret;
	}

	jack = devm_kzalloc(dev, sizeof(*jack), GFP_KERNEL);
	card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
	if (!jack || !card)
		return -ENOMEM;

	if (pdata->obsolete_card_names) {
		card->name = "avs_nau8825";
	} else {
		card->driver_name = "avs_nau8825";
		card->long_name = card->name = "AVS I2S NAU8825";
	}
	card->dev = dev;
	card->owner = THIS_MODULE;
	card->suspend_pre = avs_card_suspend_pre;
	card->resume_post = avs_card_resume_post;
	card->dai_link = dai_link;
	card->num_links = 1;
	card->controls = card_controls;
	card->num_controls = ARRAY_SIZE(card_controls);
	card->dapm_widgets = card_widgets;
	card->num_dapm_widgets = ARRAY_SIZE(card_widgets);
	card->dapm_routes = card_base_routes;
	card->num_dapm_routes = ARRAY_SIZE(card_base_routes);
	card->fully_routed = true;
	snd_soc_card_set_drvdata(card, jack);

	return devm_snd_soc_register_deferrable_card(dev, card);
}

static const struct platform_device_id avs_nau8825_driver_ids[] = {
	{
		.name = "avs_nau8825",
	},
	{},
};
MODULE_DEVICE_TABLE(platform, avs_nau8825_driver_ids);

static struct platform_driver avs_nau8825_driver = {
	.probe = avs_nau8825_probe,
	.driver = {
		.name = "avs_nau8825",
		.pm = &snd_soc_pm_ops,
	},
	.id_table = avs_nau8825_driver_ids,
};

module_platform_driver(avs_nau8825_driver)

MODULE_DESCRIPTION("Intel nau8825 machine driver");
MODULE_LICENSE("GPL");