1 files changed, 114 insertions, 0 deletions
diff --git a/sound/soc/codecs/simple-amplifier.c b/sound/soc/codecs/simple-amplifier.c
new file mode 100644
index 000000000..b30fc1f89
--- /dev/null
+++ b/sound/soc/codecs/simple-amplifier.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2017 BayLibre, SAS.
+ * Author: Jerome Brunet <jbrunet@baylibre.com>
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+#include <sound/soc.h>
+
+#define DRV_NAME "simple-amplifier"
+
+struct simple_amp {
+	struct gpio_desc *gpiod_enable;
+};
+
+static int drv_event(struct snd_soc_dapm_widget *w,
+		     struct snd_kcontrol *control, int event)
+{
+	struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
+	struct simple_amp *priv = snd_soc_component_get_drvdata(c);
+	int val;
+
+	switch (event) {
+	case SND_SOC_DAPM_POST_PMU:
+		val = 1;
+		break;
+	case SND_SOC_DAPM_PRE_PMD:
+		val = 0;
+		break;
+	default:
+		WARN(1, "Unexpected event");
+		return -EINVAL;
+	}
+
+	gpiod_set_value_cansleep(priv->gpiod_enable, val);
+
+	return 0;
+}
+
+static const struct snd_soc_dapm_widget simple_amp_dapm_widgets[] = {
+	SND_SOC_DAPM_INPUT("INL"),
+	SND_SOC_DAPM_INPUT("INR"),
+	SND_SOC_DAPM_OUT_DRV_E("DRV", SND_SOC_NOPM, 0, 0, NULL, 0, drv_event,
+			       (SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD)),
+	SND_SOC_DAPM_OUTPUT("OUTL"),
+	SND_SOC_DAPM_OUTPUT("OUTR"),
+	SND_SOC_DAPM_REGULATOR_SUPPLY("VCC", 20, 0),
+};
+
+static const struct snd_soc_dapm_route simple_amp_dapm_routes[] = {
+	{ "DRV", NULL, "INL" },
+	{ "DRV", NULL, "INR" },
+	{ "OUTL", NULL, "VCC" },
+	{ "OUTR", NULL, "VCC" },
+	{ "OUTL", NULL, "DRV" },
+	{ "OUTR", NULL, "DRV" },
+};
+
+static const struct snd_soc_component_driver simple_amp_component_driver = {
+	.dapm_widgets		= simple_amp_dapm_widgets,
+	.num_dapm_widgets	= ARRAY_SIZE(simple_amp_dapm_widgets),
+	.dapm_routes		= simple_amp_dapm_routes,
+	.num_dapm_routes	= ARRAY_SIZE(simple_amp_dapm_routes),
+};
+
+static int simple_amp_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct simple_amp *priv;
+	int err;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (priv == NULL)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, priv);
+
+	priv->gpiod_enable = devm_gpiod_get_optional(dev, "enable",
+						     GPIOD_OUT_LOW);
+	if (IS_ERR(priv->gpiod_enable)) {
+		err = PTR_ERR(priv->gpiod_enable);
+		if (err != -EPROBE_DEFER)
+			dev_err(dev, "Failed to get 'enable' gpio: %d", err);
+		return err;
+	}
+
+	return devm_snd_soc_register_component(dev,
+					       &simple_amp_component_driver,
+					       NULL, 0);
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id simple_amp_ids[] = {
+	{ .compatible = "dioo,dio2125", },
+	{ .compatible = "simple-audio-amplifier", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, simple_amp_ids);
+#endif
+
+static struct platform_driver simple_amp_driver = {
+	.driver = {
+		.name = DRV_NAME,
+		.of_match_table = of_match_ptr(simple_amp_ids),
+	},
+	.probe = simple_amp_probe,
+};
+
+module_platform_driver(simple_amp_driver);
+
+MODULE_DESCRIPTION("ASoC Simple Audio Amplifier driver");
+MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
+MODULE_LICENSE("GPL");