From: Jonathan Albrieux jonathan.albrieux@gmail.com

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@gmail.com Co-developed-by: Stephan Gerhold stephan@gerhold.net Signed-off-by: Stephan Gerhold stephan@gerhold.net --- 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");