1 files changed, 273 insertions, 0 deletions
diff --git a/sound/soc/codecs/pcm1789.c b/sound/soc/codecs/pcm1789.c
new file mode 100644
index 000000000..8df6447c7
--- /dev/null
+++ b/sound/soc/codecs/pcm1789.c
@@ -0,0 +1,273 @@
+// SPDX-License-Identifier: GPL-2.0
+// Audio driver for PCM1789
+// Copyright (C) 2018 Bootlin
+// Mylène Josserand <mylene.josserand@bootlin.com>
+
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/workqueue.h>
+
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/tlv.h>
+
+#include "pcm1789.h"
+
+#define PCM1789_MUTE_CONTROL	0x10
+#define PCM1789_FMT_CONTROL	0x11
+#define PCM1789_SOFT_MUTE	0x14
+#define PCM1789_DAC_VOL_LEFT	0x18
+#define PCM1789_DAC_VOL_RIGHT	0x19
+
+#define PCM1789_FMT_MASK	0x07
+#define PCM1789_MUTE_MASK	0x03
+#define PCM1789_MUTE_SRET	0x06
+
+struct pcm1789_private {
+	struct regmap *regmap;
+	unsigned int format;
+	unsigned int rate;
+	struct gpio_desc *reset;
+	struct work_struct work;
+	struct device *dev;
+};
+
+static const struct reg_default pcm1789_reg_defaults[] = {
+	{ PCM1789_FMT_CONTROL, 0x00 },
+	{ PCM1789_SOFT_MUTE, 0x00 },
+	{ PCM1789_DAC_VOL_LEFT, 0xff },
+	{ PCM1789_DAC_VOL_RIGHT, 0xff },
+};
+
+static bool pcm1789_accessible_reg(struct device *dev, unsigned int reg)
+{
+	return reg >= PCM1789_MUTE_CONTROL && reg <= PCM1789_DAC_VOL_RIGHT;
+}
+
+static bool pcm1789_writeable_reg(struct device *dev, unsigned int reg)
+{
+	return pcm1789_accessible_reg(dev, reg);
+}
+
+static int pcm1789_set_dai_fmt(struct snd_soc_dai *codec_dai,
+			       unsigned int format)
+{
+	struct snd_soc_component *component = codec_dai->component;
+	struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
+
+	priv->format = format;
+
+	return 0;
+}
+
+static int pcm1789_digital_mute(struct snd_soc_dai *codec_dai, int mute)
+{
+	struct snd_soc_component *component = codec_dai->component;
+	struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
+
+	return regmap_update_bits(priv->regmap, PCM1789_SOFT_MUTE,
+				  PCM1789_MUTE_MASK,
+				  mute ? 0 : PCM1789_MUTE_MASK);
+}
+
+static int pcm1789_hw_params(struct snd_pcm_substream *substream,
+			     struct snd_pcm_hw_params *params,
+			     struct snd_soc_dai *codec_dai)
+{
+	struct snd_soc_component *component = codec_dai->component;
+	struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
+	int val = 0, ret;
+
+	priv->rate = params_rate(params);
+
+	switch (priv->format & SND_SOC_DAIFMT_FORMAT_MASK) {
+	case SND_SOC_DAIFMT_RIGHT_J:
+		switch (params_width(params)) {
+		case 24:
+			val = 2;
+			break;
+		case 16:
+			val = 3;
+			break;
+		default:
+			return -EINVAL;
+		}
+		break;
+	case SND_SOC_DAIFMT_I2S:
+		switch (params_width(params)) {
+		case 16:
+		case 24:
+		case 32:
+			val = 0;
+			break;
+		default:
+			return -EINVAL;
+		}
+		break;
+	case SND_SOC_DAIFMT_LEFT_J:
+		switch (params_width(params)) {
+		case 16:
+		case 24:
+		case 32:
+			val = 1;
+			break;
+		default:
+			return -EINVAL;
+		}
+		break;
+	default:
+		dev_err(component->dev, "Invalid DAI format\n");
+		return -EINVAL;
+	}
+
+	ret = regmap_update_bits(priv->regmap, PCM1789_FMT_CONTROL,
+				 PCM1789_FMT_MASK, val);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static void pcm1789_work_queue(struct work_struct *work)
+{
+	struct pcm1789_private *priv = container_of(work,
+						    struct pcm1789_private,
+						    work);
+
+	/* Perform a software reset to remove codec from desynchronized state */
+	if (regmap_update_bits(priv->regmap, PCM1789_MUTE_CONTROL,
+			       0x3 << PCM1789_MUTE_SRET, 0) < 0)
+		dev_err(priv->dev, "Error while setting SRET");
+}
+
+static int pcm1789_trigger(struct snd_pcm_substream *substream, int cmd,
+			   struct snd_soc_dai *dai)
+{
+	struct snd_soc_component *component = dai->component;
+	struct pcm1789_private *priv = snd_soc_component_get_drvdata(component);
+	int ret = 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		schedule_work(&priv->work);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static const struct snd_soc_dai_ops pcm1789_dai_ops = {
+	.set_fmt	= pcm1789_set_dai_fmt,
+	.hw_params	= pcm1789_hw_params,
+	.digital_mute	= pcm1789_digital_mute,
+	.trigger	= pcm1789_trigger,
+};
+
+static const DECLARE_TLV_DB_SCALE(pcm1789_dac_tlv, -12000, 50, 1);
+
+static const struct snd_kcontrol_new pcm1789_controls[] = {
+	SOC_DOUBLE_R_RANGE_TLV("DAC Playback Volume", PCM1789_DAC_VOL_LEFT,
+			       PCM1789_DAC_VOL_RIGHT, 0, 0xf, 0xff, 0,
+			       pcm1789_dac_tlv),
+};
+
+static const struct snd_soc_dapm_widget pcm1789_dapm_widgets[] = {
+	SND_SOC_DAPM_OUTPUT("IOUTL+"),
+	SND_SOC_DAPM_OUTPUT("IOUTL-"),
+	SND_SOC_DAPM_OUTPUT("IOUTR+"),
+	SND_SOC_DAPM_OUTPUT("IOUTR-"),
+};
+
+static const struct snd_soc_dapm_route pcm1789_dapm_routes[] = {
+	{ "IOUTL+", NULL, "Playback" },
+	{ "IOUTL-", NULL, "Playback" },
+	{ "IOUTR+", NULL, "Playback" },
+	{ "IOUTR-", NULL, "Playback" },
+};
+
+static struct snd_soc_dai_driver pcm1789_dai = {
+	.name = "pcm1789-hifi",
+	.playback = {
+		.stream_name = "Playback",
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = SNDRV_PCM_RATE_CONTINUOUS,
+		.rate_min = 10000,
+		.rate_max = 200000,
+		.formats = PCM1789_FORMATS,
+	},
+	.ops = &pcm1789_dai_ops,
+};
+
+const struct regmap_config pcm1789_regmap_config = {
+	.reg_bits		= 8,
+	.val_bits		= 8,
+	.max_register		= PCM1789_DAC_VOL_RIGHT,
+	.reg_defaults		= pcm1789_reg_defaults,
+	.num_reg_defaults	= ARRAY_SIZE(pcm1789_reg_defaults),
+	.writeable_reg		= pcm1789_writeable_reg,
+	.readable_reg		= pcm1789_accessible_reg,
+};
+EXPORT_SYMBOL_GPL(pcm1789_regmap_config);
+
+static const struct snd_soc_component_driver soc_component_dev_pcm1789 = {
+	.controls		= pcm1789_controls,
+	.num_controls		= ARRAY_SIZE(pcm1789_controls),
+	.dapm_widgets		= pcm1789_dapm_widgets,
+	.num_dapm_widgets	= ARRAY_SIZE(pcm1789_dapm_widgets),
+	.dapm_routes		= pcm1789_dapm_routes,
+	.num_dapm_routes	= ARRAY_SIZE(pcm1789_dapm_routes),
+	.idle_bias_on		= 1,
+	.use_pmdown_time	= 1,
+	.endianness		= 1,
+	.non_legacy_dai_naming	= 1,
+};
+
+int pcm1789_common_init(struct device *dev, struct regmap *regmap)
+{
+	struct pcm1789_private *pcm1789;
+
+	pcm1789 = devm_kzalloc(dev, sizeof(struct pcm1789_private),
+			       GFP_KERNEL);
+	if (!pcm1789)
+		return -ENOMEM;
+
+	pcm1789->regmap = regmap;
+	pcm1789->dev = dev;
+	dev_set_drvdata(dev, pcm1789);
+
+	pcm1789->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(pcm1789->reset))
+		return PTR_ERR(pcm1789->reset);
+
+	gpiod_set_value_cansleep(pcm1789->reset, 0);
+	msleep(300);
+
+	INIT_WORK(&pcm1789->work, pcm1789_work_queue);
+
+	return devm_snd_soc_register_component(dev, &soc_component_dev_pcm1789,
+					       &pcm1789_dai, 1);
+}
+EXPORT_SYMBOL_GPL(pcm1789_common_init);
+
+int pcm1789_common_exit(struct device *dev)
+{
+	struct pcm1789_private *priv = dev_get_drvdata(dev);
+
+	flush_work(&priv->work);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pcm1789_common_exit);
+
+MODULE_DESCRIPTION("ASoC PCM1789 driver");
+MODULE_AUTHOR("Mylène Josserand <mylene.josserand@free-electrons.com>");
+MODULE_LICENSE("GPL");