From: Jonathan Albrieux <jonathan.albrieux@xxxxxxxxx>
The Awinic AW8738 is a simple audio amplifier using a single GPIO.
The main difference to simple-amplifier is that there is a "one-wire
pulse control" that allows configuring the amplifier to one of a few
pre-defined modes. This can be used to configure the speaker-guard
function (primarily the power limit for the amplifier).
Add a simple driver that allows setting it up in the device tree
with a specified mode number.
Signed-off-by: Jonathan Albrieux <jonathan.albrieux@xxxxxxxxx>
Co-developed-by: Stephan Gerhold <stephan@xxxxxxxxxxx>
Signed-off-by: Stephan Gerhold <stephan@xxxxxxxxxxx>
---
Changes in v2:
- Clarify purpose of operation modes in commit message.
- Rename "enable" GPIO -> "mode" GPIO to better reflect its true
purpose.
---
sound/soc/codecs/Kconfig | 10 ++++
sound/soc/codecs/Makefile | 2 +
sound/soc/codecs/aw8738.c | 104 ++++++++++++++++++++++++++++++++++++++
3 files changed, 116 insertions(+)
create mode 100644 sound/soc/codecs/aw8738.c
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 4de029ae377c..f46a22660103 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -53,6 +53,7 @@ config SND_SOC_ALL_CODECS
imply SND_SOC_AK5558
imply SND_SOC_ALC5623
imply SND_SOC_ALC5632
+ imply SND_SOC_AW8738
imply SND_SOC_BT_SCO
imply SND_SOC_BD28623
imply SND_SOC_CQ0093VC
@@ -579,6 +580,15 @@ config SND_SOC_ALC5632
tristate
depends on I2C
+config SND_SOC_AW8738
+ tristate "Awinic AW8738 Audio Amplifier"
+ select GPIOLIB
+ help
+ Enable support for the Awinic AW8738 audio amplifier (or similar).
+ The driver supports simple audio amplifiers similar to
+ SND_SOC_SIMPLE_AMPLIFIER, but additionally allows setting the
+ operation mode using the Awinic-specific one-wire pulse control.
+
config SND_SOC_BD28623
tristate "ROHM BD28623 CODEC"
help
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index c3c6059a5f8a..8637e9e869e3 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -45,6 +45,7 @@ snd-soc-ak4671-objs := ak4671.o
snd-soc-ak5386-objs := ak5386.o
snd-soc-ak5558-objs := ak5558.o
snd-soc-arizona-objs := arizona.o arizona-jack.o
+snd-soc-aw8738-objs := aw8738.o
snd-soc-bd28623-objs := bd28623.o
snd-soc-bt-sco-objs := bt-sco.o
snd-soc-cpcap-objs := cpcap.o
@@ -388,6 +389,7 @@ obj-$(CONFIG_SND_SOC_AK5558) += snd-soc-ak5558.o
obj-$(CONFIG_SND_SOC_ALC5623) += snd-soc-alc5623.o
obj-$(CONFIG_SND_SOC_ALC5632) += snd-soc-alc5632.o
obj-$(CONFIG_SND_SOC_ARIZONA) += snd-soc-arizona.o
+obj-$(CONFIG_SND_SOC_AW8738) += snd-soc-aw8738.o
obj-$(CONFIG_SND_SOC_BD28623) += snd-soc-bd28623.o
obj-$(CONFIG_SND_SOC_BT_SCO) += snd-soc-bt-sco.o
obj-$(CONFIG_SND_SOC_CQ0093VC) += snd-soc-cq93vc.o
diff --git a/sound/soc/codecs/aw8738.c b/sound/soc/codecs/aw8738.c
new file mode 100644
index 000000000000..0fe8af160319
--- /dev/null
+++ b/sound/soc/codecs/aw8738.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+#include <sound/soc.h>
+
+struct aw8738_priv {
+ struct gpio_desc *gpiod_mode;
+ unsigned int mode;
+};
+
+static int aw8738_drv_event(struct snd_soc_dapm_widget *w,
+ struct snd_kcontrol *kcontrol, int event)
+{
+ struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
+ struct aw8738_priv *aw = snd_soc_component_get_drvdata(c);
+ int i;
+
+ switch (event) {
+ case SND_SOC_DAPM_POST_PMU:
+ for (i = 0; i < aw->mode; i++) {
+ gpiod_set_value_cansleep(aw->gpiod_mode, 0);
+ udelay(2);
+ gpiod_set_value_cansleep(aw->gpiod_mode, 1);
+ udelay(2);
+ }
+ msleep(40);
+ break;
+ case SND_SOC_DAPM_PRE_PMD:
+ gpiod_set_value_cansleep(aw->gpiod_mode, 0);
+ usleep_range(1000, 2000);
+ break;
+ default:
+ WARN(1, "Unexpected event");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct snd_soc_dapm_widget aw8738_dapm_widgets[] = {
+ SND_SOC_DAPM_INPUT("IN"),
+ SND_SOC_DAPM_OUT_DRV_E("DRV", SND_SOC_NOPM, 0, 0, NULL, 0, aw8738_drv_event,
+ SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
+ SND_SOC_DAPM_OUTPUT("OUT"),
+};
+
+static const struct snd_soc_dapm_route aw8738_dapm_routes[] = {
+ { "DRV", NULL, "IN" },
+ { "OUT", NULL, "DRV" },
+};
+
+static const struct snd_soc_component_driver aw8738_component_driver = {
+ .dapm_widgets = aw8738_dapm_widgets,
+ .num_dapm_widgets = ARRAY_SIZE(aw8738_dapm_widgets),
+ .dapm_routes = aw8738_dapm_routes,
+ .num_dapm_routes = ARRAY_SIZE(aw8738_dapm_routes),
+};
+
+static int aw8738_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct aw8738_priv *aw;
+ int ret;
+
+ aw = devm_kzalloc(dev, sizeof(*aw), GFP_KERNEL);
+ if (!aw)
+ return -ENOMEM;
+ platform_set_drvdata(pdev, aw);
+
+ aw->gpiod_mode = devm_gpiod_get(dev, "mode", GPIOD_OUT_LOW);
+ if (IS_ERR(aw->gpiod_mode))
+ return dev_err_probe(dev, PTR_ERR(aw->gpiod_mode),
+ "Failed to get 'mode' gpio");
+
+ ret = device_property_read_u32(dev, "awinic,mode", &aw->mode);
+ if (ret)
+ return -EINVAL;
+
+ return devm_snd_soc_register_component(&pdev->dev,
+ &aw8738_component_driver,
+ NULL, 0);
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id aw8738_of_match[] = {
+ { .compatible = "awinic,aw8738" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, aw8738_of_match);
+#endif
+
+static struct platform_driver aw8738_driver = {
+ .probe = aw8738_probe,
+ .driver = {
+ .name = "aw8738",
+ .of_match_table = of_match_ptr(aw8738_of_match),
+ },
+};
+module_platform_driver(aw8738_driver);
+
+MODULE_DESCRIPTION("Awinic AW8738 Amplifier Driver");
+MODULE_LICENSE("GPL v2");
--
2.35.1
