ASoC: ssm2305: Add amplifier driver

The ssm2305 is a simple Class-D audio amplifier. A application can
turn on/off the device by a gpio. It's also possible to hardwire the
shutdown pin.

Tested on a i.MX6 based custom board.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Marco Felsch 2018-05-17 15:55:18 +02:00 committed by Mark Brown
parent b73e93e183
commit 74f24d8728
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
4 changed files with 127 additions and 0 deletions

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@ -0,0 +1,14 @@
Analog Devices SSM2305 Speaker Amplifier
========================================
Required properties:
- compatible : "adi,ssm2305"
- shutdown-gpios : The gpio connected to the shutdown pin.
The gpio signal is ACTIVE_LOW.
Example:
ssm2305: analog-amplifier {
compatible = "adi,ssm2305";
shutdown-gpios = <&gpio3 20 GPIO_ACTIVE_LOW>;
};

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@ -145,6 +145,7 @@ config SND_SOC_ALL_CODECS
select SND_SOC_SI476X if MFD_SI476X_CORE
select SND_SOC_SIRF_AUDIO_CODEC
select SND_SOC_SPDIF
select SND_SOC_SSM2305
select SND_SOC_SSM2518 if I2C
select SND_SOC_SSM2602_SPI if SPI_MASTER
select SND_SOC_SSM2602_I2C if I2C
@ -896,6 +897,12 @@ config SND_SOC_SIRF_AUDIO_CODEC
config SND_SOC_SPDIF
tristate "S/PDIF CODEC"
config SND_SOC_SSM2305
tristate "Analog Devices SSM2305 Class-D Amplifier"
help
Enable support for Analog Devices SSM2305 filterless
high-efficiency mono Class-D audio power amplifiers.
config SND_SOC_SSM2518
tristate

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@ -156,6 +156,7 @@ snd-soc-si476x-objs := si476x.o
snd-soc-sirf-audio-codec-objs := sirf-audio-codec.o
snd-soc-spdif-tx-objs := spdif_transmitter.o
snd-soc-spdif-rx-objs := spdif_receiver.o
snd-soc-ssm2305-objs := ssm2305.o
snd-soc-ssm2518-objs := ssm2518.o
snd-soc-ssm2602-objs := ssm2602.o
snd-soc-ssm2602-spi-objs := ssm2602-spi.o
@ -410,6 +411,7 @@ obj-$(CONFIG_SND_SOC_SIGMADSP_REGMAP) += snd-soc-sigmadsp-regmap.o
obj-$(CONFIG_SND_SOC_SI476X) += snd-soc-si476x.o
obj-$(CONFIG_SND_SOC_SPDIF) += snd-soc-spdif-rx.o snd-soc-spdif-tx.o
obj-$(CONFIG_SND_SOC_SIRF_AUDIO_CODEC) += sirf-audio-codec.o
obj-$(CONFIG_SND_SOC_SSM2305) += snd-soc-ssm2305.o
obj-$(CONFIG_SND_SOC_SSM2518) += snd-soc-ssm2518.o
obj-$(CONFIG_SND_SOC_SSM2602) += snd-soc-ssm2602.o
obj-$(CONFIG_SND_SOC_SSM2602_SPI) += snd-soc-ssm2602-spi.o

104
sound/soc/codecs/ssm2305.c Normal file
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@ -0,0 +1,104 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Analog Devices SSM2305 Amplifier Driver
*
* Copyright (C) 2018 Pengutronix, Marco Felsch <kernel@pengutronix.de>
*/
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <sound/soc.h>
#define DRV_NAME "ssm2305"
struct ssm2305 {
/* shutdown gpio */
struct gpio_desc *gpiod_shutdown;
};
static int ssm2305_power_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kctrl, int event)
{
struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
struct ssm2305 *data = snd_soc_component_get_drvdata(c);
gpiod_set_value_cansleep(data->gpiod_shutdown,
SND_SOC_DAPM_EVENT_ON(event));
return 0;
}
static const struct snd_soc_dapm_widget ssm2305_dapm_widgets[] = {
/* Stereo input/output */
SND_SOC_DAPM_INPUT("L_IN"),
SND_SOC_DAPM_INPUT("R_IN"),
SND_SOC_DAPM_OUTPUT("L_OUT"),
SND_SOC_DAPM_OUTPUT("R_OUT"),
SND_SOC_DAPM_SUPPLY("Power", SND_SOC_NOPM, 0, 0, ssm2305_power_event,
SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
};
static const struct snd_soc_dapm_route ssm2305_dapm_routes[] = {
{ "L_OUT", NULL, "L_IN" },
{ "R_OUT", NULL, "R_IN" },
{ "L_IN", NULL, "Power" },
{ "R_IN", NULL, "Power" },
};
static const struct snd_soc_component_driver ssm2305_component_driver = {
.dapm_widgets = ssm2305_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(ssm2305_dapm_widgets),
.dapm_routes = ssm2305_dapm_routes,
.num_dapm_routes = ARRAY_SIZE(ssm2305_dapm_routes),
};
static int ssm2305_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ssm2305 *priv;
int err;
/* Allocate the private data */
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
/* Get shutdown gpio */
priv->gpiod_shutdown = devm_gpiod_get(dev, "shutdown",
GPIOD_OUT_LOW);
if (IS_ERR(priv->gpiod_shutdown)) {
err = PTR_ERR(priv->gpiod_shutdown);
if (err != -EPROBE_DEFER)
dev_err(dev, "Failed to get 'shutdown' gpio: %d\n",
err);
return err;
}
return devm_snd_soc_register_component(dev, &ssm2305_component_driver,
NULL, 0);
}
#ifdef CONFIG_OF
static const struct of_device_id ssm2305_of_match[] = {
{ .compatible = "adi,ssm2305", },
{ }
};
MODULE_DEVICE_TABLE(of, ssm2305_of_match);
#endif
static struct platform_driver ssm2305_driver = {
.driver = {
.name = DRV_NAME,
.of_match_table = of_match_ptr(ssm2305_of_match),
},
.probe = ssm2305_probe,
};
module_platform_driver(ssm2305_driver);
MODULE_DESCRIPTION("ASoC SSM2305 amplifier driver");
MODULE_AUTHOR("Marco Felsch <m.felsch@pengutronix.de>");
MODULE_LICENSE("GPL v2");