cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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nau8315.c (4267B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2//
      3// nau8315.c  --  NAU8315 ALSA SoC Audio Amplifier Driver
      4//
      5// Copyright 2020 Nuvoton Technology Crop.
      6//
      7// Author: David Lin <ctlin0@nuvoton.com>
      8//
      9// Based on MAX98357A.c
     10
     11#include <linux/acpi.h>
     12#include <linux/device.h>
     13#include <linux/err.h>
     14#include <linux/gpio.h>
     15#include <linux/gpio/consumer.h>
     16#include <linux/kernel.h>
     17#include <linux/module.h>
     18#include <linux/of.h>
     19#include <linux/platform_device.h>
     20#include <sound/pcm.h>
     21#include <sound/soc.h>
     22#include <sound/soc-dai.h>
     23#include <sound/soc-dapm.h>
     24
     25struct nau8315_priv {
     26	struct gpio_desc *enable;
     27	int enpin_switch;
     28};
     29
     30static int nau8315_daiops_trigger(struct snd_pcm_substream *substream,
     31		int cmd, struct snd_soc_dai *dai)
     32{
     33	struct snd_soc_component *component = dai->component;
     34	struct nau8315_priv *nau8315 =
     35		snd_soc_component_get_drvdata(component);
     36
     37	if (!nau8315->enable)
     38		return 0;
     39
     40	switch (cmd) {
     41	case SNDRV_PCM_TRIGGER_START:
     42	case SNDRV_PCM_TRIGGER_RESUME:
     43	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
     44		if (nau8315->enpin_switch) {
     45			gpiod_set_value(nau8315->enable, 1);
     46			dev_dbg(component->dev, "set enable to 1");
     47		}
     48		break;
     49	case SNDRV_PCM_TRIGGER_STOP:
     50	case SNDRV_PCM_TRIGGER_SUSPEND:
     51	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
     52		gpiod_set_value(nau8315->enable, 0);
     53		dev_dbg(component->dev, "set enable to 0");
     54		break;
     55	}
     56
     57	return 0;
     58}
     59
     60static int nau8315_enpin_event(struct snd_soc_dapm_widget *w,
     61		struct snd_kcontrol *kcontrol, int event)
     62{
     63	struct snd_soc_component *component =
     64		snd_soc_dapm_to_component(w->dapm);
     65	struct nau8315_priv *nau8315 =
     66		snd_soc_component_get_drvdata(component);
     67
     68	if (event & SND_SOC_DAPM_PRE_PMU)
     69		nau8315->enpin_switch = 1;
     70	else if (event & SND_SOC_DAPM_POST_PMD)
     71		nau8315->enpin_switch = 0;
     72
     73	return 0;
     74}
     75
     76static const struct snd_soc_dapm_widget nau8315_dapm_widgets[] = {
     77	SND_SOC_DAPM_OUTPUT("Speaker"),
     78	SND_SOC_DAPM_OUT_DRV_E("EN_Pin", SND_SOC_NOPM, 0, 0, NULL, 0,
     79			nau8315_enpin_event,
     80			SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
     81};
     82
     83static const struct snd_soc_dapm_route nau8315_dapm_routes[] = {
     84	{"EN_Pin", NULL, "HiFi Playback"},
     85	{"Speaker", NULL, "EN_Pin"},
     86};
     87
     88static const struct snd_soc_component_driver nau8315_component_driver = {
     89	.dapm_widgets		= nau8315_dapm_widgets,
     90	.num_dapm_widgets	= ARRAY_SIZE(nau8315_dapm_widgets),
     91	.dapm_routes		= nau8315_dapm_routes,
     92	.num_dapm_routes	= ARRAY_SIZE(nau8315_dapm_routes),
     93	.idle_bias_on		= 1,
     94	.use_pmdown_time	= 1,
     95	.endianness		= 1,
     96	.non_legacy_dai_naming	= 1,
     97};
     98
     99static const struct snd_soc_dai_ops nau8315_dai_ops = {
    100	.trigger	= nau8315_daiops_trigger,
    101};
    102
    103#define NAU8315_RATES SNDRV_PCM_RATE_8000_96000
    104#define NAU8315_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE)
    105
    106static struct snd_soc_dai_driver nau8315_dai_driver = {
    107	.name = "nau8315-hifi",
    108	.playback = {
    109		.stream_name	= "HiFi Playback",
    110		.formats	= NAU8315_FORMATS,
    111		.rates		= NAU8315_RATES,
    112		.channels_min	= 1,
    113		.channels_max	= 2,
    114	},
    115	.ops    = &nau8315_dai_ops,
    116};
    117
    118static int nau8315_platform_probe(struct platform_device *pdev)
    119{
    120	struct nau8315_priv *nau8315;
    121
    122	nau8315 = devm_kzalloc(&pdev->dev, sizeof(*nau8315), GFP_KERNEL);
    123	if (!nau8315)
    124		return -ENOMEM;
    125
    126	nau8315->enable = devm_gpiod_get_optional(&pdev->dev,
    127				"enable", GPIOD_OUT_LOW);
    128	if (IS_ERR(nau8315->enable))
    129		return PTR_ERR(nau8315->enable);
    130
    131	dev_set_drvdata(&pdev->dev, nau8315);
    132
    133	return devm_snd_soc_register_component(&pdev->dev,
    134			&nau8315_component_driver,
    135			&nau8315_dai_driver, 1);
    136}
    137
    138#ifdef CONFIG_OF
    139static const struct of_device_id nau8315_device_id[] = {
    140	{ .compatible = "nuvoton,nau8315" },
    141	{}
    142};
    143MODULE_DEVICE_TABLE(of, nau8315_device_id);
    144#endif
    145
    146#ifdef CONFIG_ACPI
    147static const struct acpi_device_id nau8315_acpi_match[] = {
    148	{ "NVTN2010", 0 },
    149	{},
    150};
    151MODULE_DEVICE_TABLE(acpi, nau8315_acpi_match);
    152#endif
    153
    154static struct platform_driver nau8315_platform_driver = {
    155	.driver = {
    156		.name = "nau8315",
    157		.of_match_table = of_match_ptr(nau8315_device_id),
    158		.acpi_match_table = ACPI_PTR(nau8315_acpi_match),
    159	},
    160	.probe	= nau8315_platform_probe,
    161};
    162module_platform_driver(nau8315_platform_driver);
    163
    164MODULE_DESCRIPTION("ASoC NAU8315 Mono Class-D Amplifier Driver");
    165MODULE_AUTHOR("David Lin <ctlin0@nuvoton.com>");
    166MODULE_LICENSE("GPL v2");