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