ASoC: es7134: add es7134 DAC driver

The es7134 is 24bit, 192Khz i2s DA converter for PCM audio.
Datasheet is available here : http://www.everest-semi.com/pdf/ES7134LV%20DS.pdf

This driver is also compatible with the es7144, which is the same as the
es7134, with 2 additional pins for filtering capacitors.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 116 insertions, 0 deletions

diff --git a/sound/soc/codecs/es7134.c b/sound/soc/codecs/es7134.c
new file mode 100644
index 000000000000..25ede825d349
--- /dev/null
+++ b/sound/soc/codecs/es7134.c
@@ -0,0 +1,116 @@
+/*
+ * 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/module.h>
+#include <sound/soc.h>
+
+/*
+ * The everest 7134 is a very simple DA converter with no register
+ */
+
+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,
+};
+
+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_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 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 struct snd_soc_codec_driver es7134_codec_driver = {
+	.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),
+	},
+};
+
+static int es7134_probe(struct platform_device *pdev)
+{
+	return snd_soc_register_codec(&pdev->dev,
+				      &es7134_codec_driver,
+				      &es7134_dai, 1);
+}
+
+static int es7134_remove(struct platform_device *pdev)
+{
+	snd_soc_unregister_codec(&pdev->dev);
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id es7134_ids[] = {
+	{ .compatible = "everest,es7134", },
+	{ .compatible = "everest,es7144", },
+	{ }
+};
+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,
+	.remove = es7134_remove,
+};
+
+module_platform_driver(es7134_driver);
+
+MODULE_DESCRIPTION("ASoC ES7134 audio codec driver");
+MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
+MODULE_LICENSE("GPL");