[PATCH 08/16] ASoC: pcm1773-codec: write a driver for the PCM1773 chip from TI

[H. Nikolaus Schaller]

From: Grond <grond66@xxxxxxxxxx>

This chip is used in the OpenPandora.

Signed-off-by: Grond <grond66@xxxxxxxxxx>
Signed-off-by: H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>
---
 sound/soc/codecs/Kconfig   |   5 ++
 sound/soc/codecs/pcm1773.c | 149 +++++++++++++++++++++++++++++++++++++
 2 files changed, 154 insertions(+)
 create mode 100644 sound/soc/codecs/pcm1773.c

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 252f683be3c18..3e186652fa06d 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -182,6 +182,7 @@ config SND_SOC_ALL_CODECS
 	imply SND_SOC_HDMI_CODEC
 	imply SND_SOC_PCM1681
 	imply SND_SOC_PCM1754
+	imply SND_SOC_PCM1773
 	imply SND_SOC_PCM1789_I2C
 	imply SND_SOC_PCM179X_I2C
 	imply SND_SOC_PCM179X_SPI
@@ -1541,6 +1542,10 @@ config SND_SOC_PCM1754
 	tristate "Texas Instruments PCM1754 CODEC"
 	depends on GPIOLIB
 
+config SND_SOC_PCM1773
+	tristate "Texas Instruments PCM1773 CODEC"
+	select GPIOLIB
+
 config SND_SOC_PCM1789
 	tristate
 
diff --git a/sound/soc/codecs/pcm1773.c b/sound/soc/codecs/pcm1773.c
new file mode 100644
index 0000000000000..75f9fe40a89d5
--- /dev/null
+++ b/sound/soc/codecs/pcm1773.c
@@ -0,0 +1,149 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * pcm1773.c -- codec for the simple PCM1773 output codec from TI
+ *
+ * Shamelessly cobbled together from sound/soc/ti/omap3pandora.c and a few
+ * other codec drivers in sound/soc/codecs/
+ *
+ * Author: Grond <grond66@xxxxxxxxxx>
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <sound/soc.h>
+
+struct pcm1773 {
+	struct regulator *regulator;
+	struct gpio_desc *enable_gpio;
+};
+
+static int pcm1773_dac_event(struct snd_soc_dapm_widget *w,
+			     struct snd_kcontrol *k, int event)
+{
+	struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
+	struct pcm1773 *ctx = snd_soc_component_get_drvdata(component);
+	struct device *dev = component->dev;
+	int ret;
+
+	/*
+	 * The PCM1773 DAC datasheet requires 1ms delay between switching
+	 * VCC power on/off and /PD pin high/low
+	 */
+	if (SND_SOC_DAPM_EVENT_ON(event)) {
+		if (ctx->regulator) {
+			ret = regulator_enable(ctx->regulator);
+			if (ret) {
+				dev_err(dev, "Failed to power DAC: %d\n", ret);
+				return ret;
+			}
+			mdelay(1);
+		}
+
+		if (ctx->enable_gpio)
+			gpiod_set_value_cansleep(ctx->enable_gpio, 1);
+	} else {
+		if (ctx->enable_gpio)
+			gpiod_set_value_cansleep(ctx->enable_gpio, 0);
+
+		if (ctx->regulator) {
+			mdelay(1);
+			regulator_disable(ctx->regulator);
+		}
+	}
+
+	return 0;
+}
+
+static const struct snd_soc_dapm_widget pcm1773_dapm_widgets[] = {
+	SND_SOC_DAPM_DAC_E("PCM1773 DAC", "HiFi Playback", SND_SOC_NOPM,
+			   0, 0, pcm1773_dac_event,
+			   SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
+};
+
+static const struct snd_soc_dapm_route pcm1773_dapm_routes[] = {
+	/* tell DAPM that the main stream flows to the PCM1773 */
+	{"PCM1773 DAC", NULL, "PCM1773 IN"},
+};
+
+static struct snd_soc_dai_driver pcm1773_dai = {
+	.name = "pcm1773-hifi",
+	.playback = {
+		.stream_name = "PCM1773 IN",
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = SNDRV_PCM_RATE_8000_48000,
+		// [TODO] these really should be BE, per the data sheet but for
+		// some reason the omap-mcbsp driver claims only to support LE.
+		// investigate
+		.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
+	},
+};
+
+static int pcm1773_probe(struct snd_soc_component *component)
+{
+	struct pcm1773 *ctx = NULL;
+	struct device *dev = component->dev;
+	int ret;
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+	snd_soc_component_set_drvdata(component, ctx);
+
+	ctx->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
+	if (IS_ERR(ctx->enable_gpio)) {
+		return dev_err_probe(dev, PTR_ERR(ctx->enable_gpio),
+				     "invalid GPIO specification for enable");
+	}
+	if (ctx->enable_gpio)
+		dev_dbg(dev, "got enable-gpio\n");
+	else
+		dev_warn(dev, "enable-gpio not specified\n");
+
+	ctx->regulator = devm_regulator_get(dev, "vcc");
+	if (IS_ERR(ctx->regulator)) {
+		dev_warn(dev, "cannot get regulator 'vcc'");
+		ctx->regulator = NULL;
+	}
+
+	return 0;
+}
+
+static const struct snd_soc_component_driver soc_component_dev_pcm1773 = {
+	.probe = pcm1773_probe,
+	.dapm_widgets = pcm1773_dapm_widgets,
+	.num_dapm_widgets = ARRAY_SIZE(pcm1773_dapm_widgets),
+	.dapm_routes = pcm1773_dapm_routes,
+	.num_dapm_routes = ARRAY_SIZE(pcm1773_dapm_routes),
+};
+
+static int pcm1773_codec_probe(struct platform_device *pdev)
+{
+	return devm_snd_soc_register_component(&pdev->dev,
+		&soc_component_dev_pcm1773,
+		&pcm1773_dai, 1);
+}
+
+static const struct of_device_id pcm1773_of_match[] = {
+	{
+		.compatible = "ti,pcm1773",
+	},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, pcm1773_of_match);
+
+static struct platform_driver pcm1773_codec_driver = {
+	.probe = pcm1773_codec_probe,
+	.driver = {
+		.name = "pcm1773-codec",
+		.of_match_table = pcm1773_of_match,
+	},
+};
+
+module_platform_driver(pcm1773_codec_driver);
+
+MODULE_DESCRIPTION("ASoC codec driver PCM1773");
+MODULE_AUTHOR("Grond");
+MODULE_LICENSE("GPL");
-- 
2.50.1 (Apple Git-155)