sound/soc/codecs/nau8315.c

   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
  25 struct nau8315_priv {
  26         struct gpio_desc *enable;
  27         int enpin_switch;
  28 };
  29
  30 static 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
  60 static 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
  76 static 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
  83 static const struct snd_soc_dapm_route nau8315_dapm_routes[] = {
  84         {"EN_Pin", NULL, "HiFi Playback"},
  85         {"Speaker", NULL, "EN_Pin"},
  86 };
  87
  88 static 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 };
  97
  98 static const struct snd_soc_dai_ops nau8315_dai_ops = {
  99         .trigger        = nau8315_daiops_trigger,
 100 };
 101
 102 #define NAU8315_RATES SNDRV_PCM_RATE_8000_96000
 103 #define NAU8315_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE)
 104
 105 static struct snd_soc_dai_driver nau8315_dai_driver = {
 106         .name = "nau8315-hifi",
 107         .playback = {
 108                 .stream_name    = "HiFi Playback",
 109                 .formats        = NAU8315_FORMATS,
 110                 .rates          = NAU8315_RATES,
 111                 .channels_min   = 1,
 112                 .channels_max   = 2,
 113         },
 114         .ops    = &nau8315_dai_ops,
 115 };
 116
 117 static int nau8315_platform_probe(struct platform_device *pdev)
 118 {
 119         struct nau8315_priv *nau8315;
 120
 121         nau8315 = devm_kzalloc(&pdev->dev, sizeof(*nau8315), GFP_KERNEL);
 122         if (!nau8315)
 123                 return -ENOMEM;
 124
 125         nau8315->enable = devm_gpiod_get_optional(&pdev->dev,
 126                                 "enable", GPIOD_OUT_LOW);
 127         if (IS_ERR(nau8315->enable))
 128                 return PTR_ERR(nau8315->enable);
 129
 130         dev_set_drvdata(&pdev->dev, nau8315);
 131
 132         return devm_snd_soc_register_component(&pdev->dev,
 133                         &nau8315_component_driver,
 134                         &nau8315_dai_driver, 1);
 135 }
 136
 137 #ifdef CONFIG_OF
 138 static const struct of_device_id nau8315_device_id[] = {
 139         { .compatible = "nuvoton,nau8315" },
 140         {}
 141 };
 142 MODULE_DEVICE_TABLE(of, nau8315_device_id);
 143 #endif
 144
 145 #ifdef CONFIG_ACPI
 146 static const struct acpi_device_id nau8315_acpi_match[] = {
 147         { "NVTN2010", 0 },
 148         {},
 149 };
 150 MODULE_DEVICE_TABLE(acpi, nau8315_acpi_match);
 151 #endif
 152
 153 static struct platform_driver nau8315_platform_driver = {
 154         .driver = {
 155                 .name = "nau8315",
 156                 .of_match_table = of_match_ptr(nau8315_device_id),
 157                 .acpi_match_table = ACPI_PTR(nau8315_acpi_match),
 158         },
 159         .probe  = nau8315_platform_probe,
 160 };
 161 module_platform_driver(nau8315_platform_driver);
 162
 163 MODULE_DESCRIPTION("ASoC NAU8315 Mono Class-D Amplifier Driver");
 164 MODULE_AUTHOR("David Lin <ctlin0@nuvoton.com>");
 165 MODULE_LICENSE("GPL v2");