sound/soc/codecs/es7134.c

/*
 * Copyright (c) 2017 BayLibre, SAS.
 * Author: Jerome Brunet <jbrunet@baylibre.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 * The full GNU General Public License is included in this distribution
 * in the file called COPYING.
 */

#include <linux/of_platform.h>
#include <linux/module.h>
#include <sound/soc.h>

/*
 * The everest 7134 is a very simple DA converter with no register
 */

struct es7134_clock_mode {
	unsigned int rate_min;
	unsigned int rate_max;
	unsigned int *mclk_fs;
	unsigned int mclk_fs_num;
};

struct es7134_chip {
	const struct es7134_clock_mode *modes;
	unsigned int mode_num;
};

struct es7134_data {
	unsigned int mclk;
	const struct es7134_chip *chip;
};

static int es7134_check_mclk(struct snd_soc_dai *dai,
			     struct es7134_data *priv,
			     unsigned int rate)
{
	unsigned int mfs = priv->mclk / rate;
	int i, j;

	for (i = 0; i < priv->chip->mode_num; i++) {
		const struct es7134_clock_mode *mode = &priv->chip->modes[i];

		if (rate < mode->rate_min || rate > mode->rate_max)
			continue;

		for (j = 0; j < mode->mclk_fs_num; j++) {
			if (mode->mclk_fs[j] == mfs)
				return 0;
		}

		dev_err(dai->dev, "unsupported mclk_fs %u for rate %u\n",
			mfs, rate);
		return -EINVAL;
	}

	/* should not happen */
	dev_err(dai->dev, "unsupported rate: %u\n", rate);
	return -EINVAL;
}

static int es7134_hw_params(struct snd_pcm_substream *substream,
			    struct snd_pcm_hw_params *params,
			    struct snd_soc_dai *dai)
{
	struct es7134_data *priv = snd_soc_dai_get_drvdata(dai);

	/* mclk has not been provided, assume it is OK */
	if (!priv->mclk)
		return 0;

	return es7134_check_mclk(dai, priv, params_rate(params));
}

static int es7134_set_sysclk(struct snd_soc_dai *dai, int clk_id,
			     unsigned int freq, int dir)
{
	struct es7134_data *priv = snd_soc_dai_get_drvdata(dai);

	if (dir == SND_SOC_CLOCK_IN && clk_id == 0) {
		priv->mclk = freq;
		return 0;
	}

	return -ENOTSUPP;
}

static int es7134_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
{
	fmt &= (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK |
		SND_SOC_DAIFMT_MASTER_MASK);

	if (fmt != (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
		    SND_SOC_DAIFMT_CBS_CFS)) {
		dev_err(codec_dai->dev, "Invalid DAI format\n");
		return -EINVAL;
	}

	return 0;
}

static const struct snd_soc_dai_ops es7134_dai_ops = {
	.set_fmt	= es7134_set_fmt,
	.hw_params	= es7134_hw_params,
	.set_sysclk	= es7134_set_sysclk,
};

static struct snd_soc_dai_driver es7134_dai = {
	.name = "es7134-hifi",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 2,
		.channels_max = 2,
		.rates = (SNDRV_PCM_RATE_8000_48000 |
			  SNDRV_PCM_RATE_88200      |
			  SNDRV_PCM_RATE_96000      |
			  SNDRV_PCM_RATE_176400     |
			  SNDRV_PCM_RATE_192000),
		.formats = (SNDRV_PCM_FMTBIT_S16_LE  |
			    SNDRV_PCM_FMTBIT_S18_3LE |
			    SNDRV_PCM_FMTBIT_S20_3LE |
			    SNDRV_PCM_FMTBIT_S24_3LE |
			    SNDRV_PCM_FMTBIT_S24_LE),
	},
	.ops = &es7134_dai_ops,
};

static const struct es7134_clock_mode es7134_modes[] = {
	{
		/* Single speed mode */
		.rate_min = 8000,
		.rate_max = 50000,
		.mclk_fs = (unsigned int[]) { 256, 384, 512, 768, 1024 },
		.mclk_fs_num = 5,
	}, {
		/* Double speed mode */
		.rate_min = 84000,
		.rate_max = 100000,
		.mclk_fs = (unsigned int[]) { 128, 192, 256, 384, 512 },
		.mclk_fs_num = 5,
	}, {
		/* Quad speed mode */
		.rate_min = 167000,
		.rate_max = 192000,
		.mclk_fs = (unsigned int[]) { 128, 192, 256 },
		.mclk_fs_num = 3,
	},
};

static const struct es7134_chip es7134_chip = {
	.modes = es7134_modes,
	.mode_num = ARRAY_SIZE(es7134_modes),
};

static const struct snd_soc_dapm_widget es7134_dapm_widgets[] = {
	SND_SOC_DAPM_OUTPUT("AOUTL"),
	SND_SOC_DAPM_OUTPUT("AOUTR"),
	SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
};

static const struct snd_soc_dapm_route es7134_dapm_routes[] = {
	{ "AOUTL", NULL, "DAC" },
	{ "AOUTR", NULL, "DAC" },
};

static const struct snd_soc_component_driver es7134_component_driver = {
	.dapm_widgets		= es7134_dapm_widgets,
	.num_dapm_widgets	= ARRAY_SIZE(es7134_dapm_widgets),
	.dapm_routes		= es7134_dapm_routes,
	.num_dapm_routes	= ARRAY_SIZE(es7134_dapm_routes),
	.idle_bias_on		= 1,
	.use_pmdown_time	= 1,
	.endianness		= 1,
	.non_legacy_dai_naming	= 1,
};

static int es7134_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct es7134_data *priv;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;
	platform_set_drvdata(pdev, priv);

	priv->chip = of_device_get_match_data(dev);
	if (!priv->chip) {
		dev_err(dev, "failed to match device\n");
		return -ENODEV;
	}

	return devm_snd_soc_register_component(&pdev->dev,
				      &es7134_component_driver,
				      &es7134_dai, 1);
}

#ifdef CONFIG_OF
static const struct of_device_id es7134_ids[] = {
	{ .compatible = "everest,es7134", .data = &es7134_chip },
	{ .compatible = "everest,es7144", .data = &es7134_chip },
	{ }
};
MODULE_DEVICE_TABLE(of, es7134_ids);
#endif

static struct platform_driver es7134_driver = {
	.driver = {
		.name = "es7134",
		.of_match_table = of_match_ptr(es7134_ids),
	},
	.probe = es7134_probe,
};

module_platform_driver(es7134_driver);

MODULE_DESCRIPTION("ASoC ES7134 audio codec driver");
MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
MODULE_LICENSE("GPL");