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Diffstat (limited to 'sound/soc/codecs/nau8315.c')
| -rw-r--r-- | sound/soc/codecs/nau8315.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/sound/soc/codecs/nau8315.c b/sound/soc/codecs/nau8315.c new file mode 100644 index 000000000..ad4dce9e5 --- /dev/null +++ b/sound/soc/codecs/nau8315.c @@ -0,0 +1,165 @@ +// SPDX-License-Identifier: GPL-2.0-only +// +// nau8315.c -- NAU8315 ALSA SoC Audio Amplifier Driver +// +// Copyright 2020 Nuvoton Technology Crop. +// +// Author: David Lin <ctlin0@nuvoton.com> +// +// Based on MAX98357A.c + +#include <linux/acpi.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/gpio.h> +#include <linux/gpio/consumer.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <sound/pcm.h> +#include <sound/soc.h> +#include <sound/soc-dai.h> +#include <sound/soc-dapm.h> + +struct nau8315_priv { + struct gpio_desc *enable; + int enpin_switch; +}; + +static int nau8315_daiops_trigger(struct snd_pcm_substream *substream, + int cmd, struct snd_soc_dai *dai) +{ + struct snd_soc_component *component = dai->component; + struct nau8315_priv *nau8315 = + snd_soc_component_get_drvdata(component); + + if (!nau8315->enable) + return 0; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + if (nau8315->enpin_switch) { + gpiod_set_value(nau8315->enable, 1); + dev_dbg(component->dev, "set enable to 1"); + } + break; + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + gpiod_set_value(nau8315->enable, 0); + dev_dbg(component->dev, "set enable to 0"); + break; + } + + return 0; +} + +static int nau8315_enpin_event(struct snd_soc_dapm_widget *w, + struct snd_kcontrol *kcontrol, int event) +{ + struct snd_soc_component *component = + snd_soc_dapm_to_component(w->dapm); + struct nau8315_priv *nau8315 = + snd_soc_component_get_drvdata(component); + + if (event & SND_SOC_DAPM_PRE_PMU) + nau8315->enpin_switch = 1; + else if (event & SND_SOC_DAPM_POST_PMD) + nau8315->enpin_switch = 0; + + return 0; +} + +static const struct snd_soc_dapm_widget nau8315_dapm_widgets[] = { + SND_SOC_DAPM_OUTPUT("Speaker"), + SND_SOC_DAPM_OUT_DRV_E("EN_Pin", SND_SOC_NOPM, 0, 0, NULL, 0, + nau8315_enpin_event, + SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD), +}; + +static const struct snd_soc_dapm_route nau8315_dapm_routes[] = { + {"EN_Pin", NULL, "HiFi Playback"}, + {"Speaker", NULL, "EN_Pin"}, +}; + +static const struct snd_soc_component_driver nau8315_component_driver = { + .dapm_widgets = nau8315_dapm_widgets, + .num_dapm_widgets = ARRAY_SIZE(nau8315_dapm_widgets), + .dapm_routes = nau8315_dapm_routes, + .num_dapm_routes = ARRAY_SIZE(nau8315_dapm_routes), + .idle_bias_on = 1, + .use_pmdown_time = 1, + .endianness = 1, +}; + +static const struct snd_soc_dai_ops nau8315_dai_ops = { + .trigger = nau8315_daiops_trigger, +}; + +#define NAU8315_RATES SNDRV_PCM_RATE_8000_96000 +#define NAU8315_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE) + +static struct snd_soc_dai_driver nau8315_dai_driver = { + .name = "nau8315-hifi", + .playback = { + .stream_name = "HiFi Playback", + .formats = NAU8315_FORMATS, + .rates = NAU8315_RATES, + .channels_min = 1, + .channels_max = 2, + }, + .ops = &nau8315_dai_ops, +}; + +static int nau8315_platform_probe(struct platform_device *pdev) +{ + struct nau8315_priv *nau8315; + + nau8315 = devm_kzalloc(&pdev->dev, sizeof(*nau8315), GFP_KERNEL); + if (!nau8315) + return -ENOMEM; + + nau8315->enable = devm_gpiod_get_optional(&pdev->dev, + "enable", GPIOD_OUT_LOW); + if (IS_ERR(nau8315->enable)) + return PTR_ERR(nau8315->enable); + + dev_set_drvdata(&pdev->dev, nau8315); + + return devm_snd_soc_register_component(&pdev->dev, + &nau8315_component_driver, + &nau8315_dai_driver, 1); +} + +#ifdef CONFIG_OF +static const struct of_device_id nau8315_device_id[] = { + { .compatible = "nuvoton,nau8315" }, + {} +}; +MODULE_DEVICE_TABLE(of, nau8315_device_id); +#endif + +#ifdef CONFIG_ACPI +static const struct acpi_device_id nau8315_acpi_match[] = { + { "NVTN2010", 0 }, + {}, +}; +MODULE_DEVICE_TABLE(acpi, nau8315_acpi_match); +#endif + +static struct platform_driver nau8315_platform_driver = { + .driver = { + .name = "nau8315", + .of_match_table = of_match_ptr(nau8315_device_id), + .acpi_match_table = ACPI_PTR(nau8315_acpi_match), + }, + .probe = nau8315_platform_probe, +}; +module_platform_driver(nau8315_platform_driver); + +MODULE_DESCRIPTION("ASoC NAU8315 Mono Class-D Amplifier Driver"); +MODULE_AUTHOR("David Lin <ctlin0@nuvoton.com>"); +MODULE_LICENSE("GPL v2"); |