ASoC: Add PCM1792A spi mode codec support

Add PCM1792A spi mode codec support. This version implements only
a subset of functionalities. Tested connect to a pandaboard ES
device and based on recently pcm1681 codec.

Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 245 insertions, 0 deletions

diff --git a/sound/soc/codecs/pcm1792a.c b/sound/soc/codecs/pcm1792a.c
new file mode 100644
index 000000000000..3f83bf9895d4
--- /dev/null
+++ b/sound/soc/codecs/pcm1792a.c
@@ -0,0 +1,245 @@
+/*
+ * PCM1792A ASoC codec driver
+ *
+ * Copyright (c) Amarula Solutions B.V. 2013
+ *
+ *     Michael Trimarchi <michael@amarulasolutions.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/spi/spi.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+#include <sound/tlv.h>
+#include <linux/of_device.h>
+
+#include "pcm1792a.h"
+
+#define PCM1792A_DAC_VOL_LEFT	0x10
+#define PCM1792A_DAC_VOL_RIGHT	0x11
+#define PCM1792A_FMT_CONTROL	0x12
+#define PCM1792A_SOFT_MUTE	PCM1792A_FMT_CONTROL
+
+#define PCM1792A_FMT_MASK	0x70
+#define PCM1792A_FMT_SHIFT	4
+#define PCM1792A_MUTE_MASK	0x01
+#define PCM1792A_MUTE_SHIFT	0
+#define PCM1792A_ATLD_ENABLE	(1 << 7)
+
+static const struct reg_default pcm1792a_reg_defaults[] = {
+	{ 0x10, 0xff },
+	{ 0x11, 0xff },
+	{ 0x12, 0x50 },
+	{ 0x13, 0x00 },
+	{ 0x14, 0x00 },
+	{ 0x15, 0x01 },
+	{ 0x16, 0x00 },
+	{ 0x17, 0x00 },
+};
+
+static bool pcm1792a_accessible_reg(struct device *dev, unsigned int reg)
+{
+	return reg >= 0x10 && reg <= 0x17;
+}
+
+static bool pcm1792a_writeable_reg(struct device *dev, unsigned register reg)
+{
+	bool accessible;
+
+	accessible = pcm1792a_accessible_reg(dev, reg);
+
+	return accessible && reg != 0x16 && reg != 0x17;
+}
+
+struct pcm1792a_private {
+	struct regmap *regmap;
+	unsigned int format;
+	unsigned int rate;
+};
+
+static int pcm1792a_set_dai_fmt(struct snd_soc_dai *codec_dai,
+                             unsigned int format)
+{
+	struct snd_soc_codec *codec = codec_dai->codec;
+	struct pcm1792a_private *priv = snd_soc_codec_get_drvdata(codec);
+
+	priv->format = format;
+
+	return 0;
+}
+
+static int pcm1792a_digital_mute(struct snd_soc_dai *dai, int mute)
+{
+	struct snd_soc_codec *codec = dai->codec;
+	struct pcm1792a_private *priv = snd_soc_codec_get_drvdata(codec);
+	int ret;
+
+	ret = regmap_update_bits(priv->regmap, PCM1792A_SOFT_MUTE,
+				 PCM1792A_MUTE_MASK, !!mute);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int pcm1792a_hw_params(struct snd_pcm_substream *substream,
+			     struct snd_pcm_hw_params *params,
+			     struct snd_soc_dai *dai)
+{
+	struct snd_soc_codec *codec = dai->codec;
+	struct pcm1792a_private *priv = snd_soc_codec_get_drvdata(codec);
+	int val = 0, ret;
+	int pcm_format = params_format(params);
+
+	priv->rate = params_rate(params);
+
+	switch (priv->format & SND_SOC_DAIFMT_FORMAT_MASK) {
+	case SND_SOC_DAIFMT_RIGHT_J:
+		if (pcm_format == SNDRV_PCM_FORMAT_S24_LE ||
+		    pcm_format == SNDRV_PCM_FORMAT_S32_LE)
+			val = 0x02;
+		else if (pcm_format == SNDRV_PCM_FORMAT_S16_LE)
+			val = 0x00;
+		break;
+	case SND_SOC_DAIFMT_I2S:
+		if (pcm_format == SNDRV_PCM_FORMAT_S24_LE ||
+		    pcm_format == SNDRV_PCM_FORMAT_S32_LE)
+			val = 0x05;
+		else if (pcm_format == SNDRV_PCM_FORMAT_S16_LE)
+			val = 0x04;
+		break;
+	default:
+		dev_err(codec->dev, "Invalid DAI format\n");
+		return -EINVAL;
+	}
+
+	val = val << PCM1792A_FMT_SHIFT | PCM1792A_ATLD_ENABLE;
+
+	ret = regmap_update_bits(priv->regmap, PCM1792A_FMT_CONTROL,
+				 PCM1792A_FMT_MASK | PCM1792A_ATLD_ENABLE, val);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static const struct snd_soc_dai_ops pcm1792a_dai_ops = {
+	.set_fmt	= pcm1792a_set_dai_fmt,
+	.hw_params	= pcm1792a_hw_params,
+	.digital_mute	= pcm1792a_digital_mute,
+};
+
+static const DECLARE_TLV_DB_SCALE(pcm1792a_dac_tlv, -12000, 50, 1);
+
+static const struct snd_kcontrol_new pcm1792a_controls[] = {
+	SOC_DOUBLE_R_RANGE_TLV("DAC Playback Volume", PCM1792A_DAC_VOL_LEFT,
+			 PCM1792A_DAC_VOL_RIGHT, 0, 0xf, 0xff, 0,
+			 pcm1792a_dac_tlv),
+};
+
+static struct snd_soc_dai_driver pcm1792a_dai = {
+	.name = "pcm1792a-hifi",
+	.playback = {
+		.stream_name = "Playback",
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = PCM1792A_RATES,
+		.formats = PCM1792A_FORMATS, },
+	.capture = {
+		.channels_min = 0,
+		.channels_max = 0,
+	},
+	.ops = &pcm1792a_dai_ops,
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id pcm1792a_of_match[] = {
+	{ .compatible = "ti,pcm1792a", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, pcm1792a_of_match);
+#endif
+
+static const struct regmap_config pcm1792a_regmap = {
+	.reg_bits		= 8,
+	.val_bits		= 8,
+	.max_register		= 24,
+	.reg_defaults		= pcm1792a_reg_defaults,
+	.num_reg_defaults	= ARRAY_SIZE(pcm1792a_reg_defaults),
+	.writeable_reg		= pcm1792a_writeable_reg,
+	.readable_reg		= pcm1792a_accessible_reg,
+};
+
+static struct snd_soc_codec_driver soc_codec_dev_pcm1792a = {
+	.controls		= pcm1792a_controls,
+	.num_controls		= ARRAY_SIZE(pcm1792a_controls),
+};
+
+static int pcm1792a_spi_probe(struct spi_device *spi)
+{
+	struct pcm1792a_private *pcm1792a;
+	int ret;
+
+	pcm1792a = devm_kzalloc(&spi->dev, sizeof(struct pcm1792a_private),
+				GFP_KERNEL);
+	if (!pcm1792a)
+		return -ENOMEM;
+
+	spi_set_drvdata(spi, pcm1792a);
+
+	pcm1792a->regmap = devm_regmap_init_spi(spi, &pcm1792a_regmap);
+	if (IS_ERR(pcm1792a->regmap)) {
+		ret = PTR_ERR(pcm1792a->regmap);
+		dev_err(&spi->dev, "Failed to register regmap: %d\n", ret);
+		return ret;
+	}
+
+	return snd_soc_register_codec(&spi->dev,
+			&soc_codec_dev_pcm1792a, &pcm1792a_dai, 1);
+}
+
+static int pcm1792a_spi_remove(struct spi_device *spi)
+{
+	snd_soc_unregister_codec(&spi->dev);
+	return 0;
+}
+
+static const struct spi_device_id pcm1792a_spi_ids[] = {
+	{ "pcm1792a", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(spi, pcm1792a_spi_ids);
+
+static struct spi_driver pcm1792a_codec_driver = {
+	.driver = {
+		.name = "pcm1792a",
+		.owner = THIS_MODULE,
+		.of_match_table = pcm1792a_of_match,
+	},
+	.id_table = pcm1792a_spi_ids,
+	.probe = pcm1792a_spi_probe,
+	.remove = pcm1792a_spi_remove,
+};
+
+module_spi_driver(pcm1792a_codec_driver);
+
+MODULE_DESCRIPTION("ASoC PCM1792A driver");
+MODULE_AUTHOR("Michael Trimarchi <michael@amarulasolutions.com>");
+MODULE_LICENSE("GPL");