sound/soc/codecs/max98357a.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
   3  *
   4  * max98357a.c -- MAX98357A ALSA SoC Codec driver
   5  */
   6
   7 #include <linux/acpi.h>
   8 #include <linux/device.h>
   9 #include <linux/err.h>
  10 #include <linux/gpio.h>
  11 #include <linux/gpio/consumer.h>
  12 #include <linux/kernel.h>
  13 #include <linux/mod_devicetable.h>
  14 #include <linux/module.h>
  15 #include <linux/of.h>
  16 #include <linux/platform_device.h>
  17 #include <sound/pcm.h>
  18 #include <sound/soc.h>
  19 #include <sound/soc-dai.h>
  20 #include <sound/soc-dapm.h>
  21
  22 static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,
  23                 int cmd, struct snd_soc_dai *dai)
  24 {
  25         struct gpio_desc *sdmode = snd_soc_dai_get_drvdata(dai);
  26
  27         if (!sdmode)
  28                 return 0;
  29
  30         switch (cmd) {
  31         case SNDRV_PCM_TRIGGER_START:
  32         case SNDRV_PCM_TRIGGER_RESUME:
  33         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
  34                 gpiod_set_value(sdmode, 1);
  35                 break;
  36         case SNDRV_PCM_TRIGGER_STOP:
  37         case SNDRV_PCM_TRIGGER_SUSPEND:
  38         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
  39                 gpiod_set_value(sdmode, 0);
  40                 break;
  41         }
  42
  43         return 0;
  44 }
  45
  46 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
  47         SND_SOC_DAPM_OUTPUT("Speaker"),
  48 };
  49
  50 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
  51         {"Speaker", NULL, "HiFi Playback"},
  52 };
  53
  54 static int max98357a_component_probe(struct snd_soc_component *component)
  55 {
  56         struct gpio_desc *sdmode;
  57
  58         sdmode = devm_gpiod_get_optional(component->dev, "sdmode", GPIOD_OUT_LOW);
  59         if (IS_ERR(sdmode))
  60                 return PTR_ERR(sdmode);
  61
  62         snd_soc_component_set_drvdata(component, sdmode);
  63
  64         return 0;
  65 }
  66
  67 static const struct snd_soc_component_driver max98357a_component_driver = {
  68         .probe                  = max98357a_component_probe,
  69         .dapm_widgets           = max98357a_dapm_widgets,
  70         .num_dapm_widgets       = ARRAY_SIZE(max98357a_dapm_widgets),
  71         .dapm_routes            = max98357a_dapm_routes,
  72         .num_dapm_routes        = ARRAY_SIZE(max98357a_dapm_routes),
  73         .idle_bias_on           = 1,
  74         .use_pmdown_time        = 1,
  75         .endianness             = 1,
  76         .non_legacy_dai_naming  = 1,
  77 };
  78
  79 static const struct snd_soc_dai_ops max98357a_dai_ops = {
  80         .trigger        = max98357a_daiops_trigger,
  81 };
  82
  83 static struct snd_soc_dai_driver max98357a_dai_driver = {
  84         .name = "HiFi",
  85         .playback = {
  86                 .stream_name    = "HiFi Playback",
  87                 .formats        = SNDRV_PCM_FMTBIT_S16 |
  88                                         SNDRV_PCM_FMTBIT_S24 |
  89                                         SNDRV_PCM_FMTBIT_S32,
  90                 .rates          = SNDRV_PCM_RATE_8000 |
  91                                         SNDRV_PCM_RATE_16000 |
  92                                         SNDRV_PCM_RATE_32000 |
  93                                         SNDRV_PCM_RATE_44100 |
  94                                         SNDRV_PCM_RATE_48000 |
  95                                         SNDRV_PCM_RATE_88200 |
  96                                         SNDRV_PCM_RATE_96000,
  97                 .rate_min       = 8000,
  98                 .rate_max       = 96000,
  99                 .channels_min   = 1,
 100                 .channels_max   = 2,
 101         },
 102         .ops    = &max98357a_dai_ops,
 103 };
 104
 105 static int max98357a_platform_probe(struct platform_device *pdev)
 106 {
 107         return devm_snd_soc_register_component(&pdev->dev,
 108                         &max98357a_component_driver,
 109                         &max98357a_dai_driver, 1);
 110 }
 111
 112 static int max98357a_platform_remove(struct platform_device *pdev)
 113 {
 114         return 0;
 115 }
 116
 117 #ifdef CONFIG_OF
 118 static const struct of_device_id max98357a_device_id[] = {
 119         { .compatible = "maxim,max98357a" },
 120         {}
 121 };
 122 MODULE_DEVICE_TABLE(of, max98357a_device_id);
 123 #endif
 124
 125 #ifdef CONFIG_ACPI
 126 static const struct acpi_device_id max98357a_acpi_match[] = {
 127         { "MX98357A", 0 },
 128         {},
 129 };
 130 MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match);
 131 #endif
 132
 133 static struct platform_driver max98357a_platform_driver = {
 134         .driver = {
 135                 .name = "max98357a",
 136                 .of_match_table = of_match_ptr(max98357a_device_id),
 137                 .acpi_match_table = ACPI_PTR(max98357a_acpi_match),
 138         },
 139         .probe  = max98357a_platform_probe,
 140         .remove = max98357a_platform_remove,
 141 };
 142 module_platform_driver(max98357a_platform_driver);
 143
 144 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
 145 MODULE_LICENSE("GPL v2");