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 ---

Notes (changelog): v2: - fix copyright information - rename shutdown gpio and add some more documentation - mark shutdown gpio as required - rm registration information

v3: - fix error handling

v4: - fix license header

.../devicetree/bindings/sound/adi,ssm2305.txt | 14 +++ sound/soc/codecs/Kconfig | 7 ++ sound/soc/codecs/Makefile | 2 + sound/soc/codecs/ssm2305.c | 104 ++++++++++++++++++ 4 files changed, 127 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/adi,ssm2305.txt create mode 100644 sound/soc/codecs/ssm2305.c

diff --git a/Documentation/devicetree/bindings/sound/adi,ssm2305.txt b/Documentation/devicetree/bindings/sound/adi,ssm2305.txt new file mode 100644 index 000000000000..a9c9d83c8a30 --- /dev/null +++ b/Documentation/devicetree/bindings/sound/adi,ssm2305.txt @@ -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>; +}; diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig index 9548f63ca531..d81b0cb291a3 100644 --- a/sound/soc/codecs/Kconfig +++ b/sound/soc/codecs/Kconfig @@ -142,6 +142,7 @@ 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 @@ -883,6 +884,12 @@ 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

diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile index e849d1495308..7d75ac8f6716 100644 --- a/sound/soc/codecs/Makefile +++ b/sound/soc/codecs/Makefile @@ -153,6 +153,7 @@ 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 @@ -404,6 +405,7 @@ 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 diff --git a/sound/soc/codecs/ssm2305.c b/sound/soc/codecs/ssm2305.c new file mode 100644 index 000000000000..d17864c3e2a9 --- /dev/null +++ b/sound/soc/codecs/ssm2305.c @@ -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");