Add a driver for simple mux driven by gpios. It currently only supports one
gpio, muxing one of two inputs to a single output.
Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
---
sound/soc/codecs/Kconfig | 5 ++
sound/soc/codecs/Makefile | 4 ++
sound/soc/codecs/simple-mux.c | 124 ++++++++++++++++++++++++++++++++++
3 files changed, 133 insertions(+)
create mode 100644 sound/soc/codecs/simple-mux.c
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 34c6dd04b85a..3847e490f795 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -181,6 +181,7 @@ config SND_SOC_ALL_CODECS
imply SND_SOC_SGTL5000
imply SND_SOC_SI476X
imply SND_SOC_SIMPLE_AMPLIFIER
+ imply SND_SOC_SIMPLE_MUX
imply SND_SOC_SIRF_AUDIO_CODEC
imply SND_SOC_SPDIF
imply SND_SOC_SSM2305
@@ -1240,6 +1241,10 @@ config SND_SOC_SIMPLE_AMPLIFIER
tristate "Simple Audio Amplifier"
select GPIOLIB
+config SND_SOC_SIMPLE_MUX
+ tristate "Simple Audio Mux"
+ select GPIOLIB
+
config SND_SOC_SIRF_AUDIO_CODEC
tristate "SiRF SoC internal audio codec"
select REGMAP_MMIO
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 11ce98c25d6c..90f1a2b7ade0 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -305,6 +305,8 @@ snd-soc-tpa6130a2-objs := tpa6130a2.o
snd-soc-tas2552-objs := tas2552.o
snd-soc-tas2562-objs := tas2562.o
snd-soc-tas2764-objs := tas2764.o
+# Mux
+snd-soc-simple-mux-objs := simple-mux.o
obj-$(CONFIG_SND_SOC_88PM860X) += snd-soc-88pm860x.o
obj-$(CONFIG_SND_SOC_AB8500_CODEC) += snd-soc-ab8500-codec.o
@@ -613,3 +615,5 @@ obj-$(CONFIG_SND_SOC_MAX9877) += snd-soc-max9877.o
obj-$(CONFIG_SND_SOC_MAX98504) += snd-soc-max98504.o
obj-$(CONFIG_SND_SOC_SIMPLE_AMPLIFIER) += snd-soc-simple-amplifier.o
obj-$(CONFIG_SND_SOC_TPA6130A2) += snd-soc-tpa6130a2.o
+# Mux
+obj-$(CONFIG_SND_SOC_SIMPLE_MUX) += snd-soc-simple-mux.o
diff --git a/sound/soc/codecs/simple-mux.c b/sound/soc/codecs/simple-mux.c
new file mode 100644
index 000000000000..e0a09dadfa7c
--- /dev/null
+++ b/sound/soc/codecs/simple-mux.c
@@ -0,0 +1,124 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2020 Bootlin SA
+ * Author: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+#include <sound/soc.h>
+
+struct simple_mux {
+ struct gpio_desc *gpiod_mux;
+ unsigned int mux;
+};
+
+static const char * const simple_mux_texts[] = {
+ "Input 1", "Input 2"
+};
+
+static SOC_ENUM_SINGLE_EXT_DECL(simple_mux_enum, simple_mux_texts);
+
+static int simple_mux_control_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
+ struct snd_soc_component *c = snd_soc_dapm_to_component(dapm);
+ struct simple_mux *priv = snd_soc_component_get_drvdata(c);
+
+ ucontrol->value.enumerated.item[0] = priv->mux;
+
+ return 0;
+}
+
+static int simple_mux_control_put(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
+ struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
+ struct snd_soc_component *c = snd_soc_dapm_to_component(dapm);
+ struct simple_mux *priv = snd_soc_component_get_drvdata(c);
+
+ if (ucontrol->value.enumerated.item[0] > e->items)
+ return -EINVAL;
+
+ if (priv->mux == ucontrol->value.enumerated.item[0])
+ return 0;
+
+ priv->mux = ucontrol->value.enumerated.item[0];
+
+ gpiod_set_value_cansleep(priv->gpiod_mux, priv->mux);
+
+ return snd_soc_dapm_mux_update_power(dapm, kcontrol,
+ ucontrol->value.enumerated.item[0],
+ e, NULL);
+}
+
+static const struct snd_kcontrol_new simple_mux_mux =
+ SOC_DAPM_ENUM_EXT("Muxer", simple_mux_enum, simple_mux_control_get, simple_mux_control_put);
+
+static const struct snd_soc_dapm_widget simple_mux_dapm_widgets[] = {
+ SND_SOC_DAPM_INPUT("IN1"),
+ SND_SOC_DAPM_INPUT("IN2"),
+ SND_SOC_DAPM_MUX("MUX", SND_SOC_NOPM, 0, 0, &simple_mux_mux),
+ SND_SOC_DAPM_OUTPUT("OUT"),
+};
+
+static const struct snd_soc_dapm_route simple_mux_dapm_routes[] = {
+ { "OUT", NULL, "MUX" },
+ { "MUX", "Input 1", "IN1" },
+ { "MUX", "Input 2", "IN2" },
+};
+
+static const struct snd_soc_component_driver simple_mux_component_driver = {
+ .dapm_widgets = simple_mux_dapm_widgets,
+ .num_dapm_widgets = ARRAY_SIZE(simple_mux_dapm_widgets),
+ .dapm_routes = simple_mux_dapm_routes,
+ .num_dapm_routes = ARRAY_SIZE(simple_mux_dapm_routes),
+};
+
+static int simple_mux_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct simple_mux *priv;
+ int err;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, priv);
+
+ priv->gpiod_mux = devm_gpiod_get(dev, "mux", GPIOD_OUT_LOW);
+ if (IS_ERR(priv->gpiod_mux)) {
+ err = PTR_ERR(priv->gpiod_mux);
+ if (err != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get 'mux' gpio: %d", err);
+ return err;
+ }
+
+ return devm_snd_soc_register_component(dev, &simple_mux_component_driver, NULL, 0);
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id simple_mux_ids[] = {
+ { .compatible = "simple-audio-mux", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, simple_mux_ids);
+#endif
+
+static struct platform_driver simple_mux_driver = {
+ .driver = {
+ .name = "simple-mux",
+ .of_match_table = of_match_ptr(simple_mux_ids),
+ },
+ .probe = simple_mux_probe,
+};
+
+module_platform_driver(simple_mux_driver);
+
+MODULE_DESCRIPTION("ASoC Simple Audio Mux driver");
+MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
--
2.28.0
