sound/soc/codecs/max98357a.c

   1 /* Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 and
   5  * only version 2 as published by the Free Software Foundation.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * max98357a.c -- MAX98357A ALSA SoC Codec driver
  13  */
  14
  15 #include <linux/acpi.h>
  16 #include <linux/device.h>
  17 #include <linux/err.h>
  18 #include <linux/gpio.h>
  19 #include <linux/gpio/consumer.h>
  20 #include <linux/kernel.h>
  21 #include <linux/mod_devicetable.h>
  22 #include <linux/module.h>
  23 #include <linux/of.h>
  24 #include <linux/platform_device.h>
  25 #include <sound/pcm.h>
  26 #include <sound/soc.h>
  27 #include <sound/soc-dai.h>
  28 #include <sound/soc-dapm.h>
  29
  30 static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,
  31                 int cmd, struct snd_soc_dai *dai)
  32 {
  33         struct gpio_desc *sdmode = snd_soc_dai_get_drvdata(dai);
  34
  35         if (!sdmode)
  36                 return 0;
  37
  38         switch (cmd) {
  39         case SNDRV_PCM_TRIGGER_START:
  40         case SNDRV_PCM_TRIGGER_RESUME:
  41         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
  42                 gpiod_set_value(sdmode, 1);
  43                 break;
  44         case SNDRV_PCM_TRIGGER_STOP:
  45         case SNDRV_PCM_TRIGGER_SUSPEND:
  46         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
  47                 gpiod_set_value(sdmode, 0);
  48                 break;
  49         }
  50
  51         return 0;
  52 }
  53
  54 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
  55         SND_SOC_DAPM_OUTPUT("Speaker"),
  56 };
  57
  58 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
  59         {"Speaker", NULL, "HiFi Playback"},
  60 };
  61
  62 static int max98357a_codec_probe(struct snd_soc_codec *codec)
  63 {
  64         struct gpio_desc *sdmode;
  65
  66         sdmode = devm_gpiod_get_optional(codec->dev, "sdmode", GPIOD_OUT_LOW);
  67         if (IS_ERR(sdmode))
  68                 return PTR_ERR(sdmode);
  69
  70         snd_soc_codec_set_drvdata(codec, sdmode);
  71
  72         return 0;
  73 }
  74
  75 static const struct snd_soc_codec_driver max98357a_codec_driver = {
  76         .probe                  = max98357a_codec_probe,
  77         .component_driver = {
  78                 .dapm_widgets           = max98357a_dapm_widgets,
  79                 .num_dapm_widgets       = ARRAY_SIZE(max98357a_dapm_widgets),
  80                 .dapm_routes            = max98357a_dapm_routes,
  81                 .num_dapm_routes        = ARRAY_SIZE(max98357a_dapm_routes),
  82         },
  83 };
  84
  85 static const struct snd_soc_dai_ops max98357a_dai_ops = {
  86         .trigger        = max98357a_daiops_trigger,
  87 };
  88
  89 static struct snd_soc_dai_driver max98357a_dai_driver = {
  90         .name = "HiFi",
  91         .playback = {
  92                 .stream_name    = "HiFi Playback",
  93                 .formats        = SNDRV_PCM_FMTBIT_S16 |
  94                                         SNDRV_PCM_FMTBIT_S24 |
  95                                         SNDRV_PCM_FMTBIT_S32,
  96                 .rates          = SNDRV_PCM_RATE_8000 |
  97                                         SNDRV_PCM_RATE_16000 |
  98                                         SNDRV_PCM_RATE_48000 |
  99                                         SNDRV_PCM_RATE_96000,
 100                 .rate_min       = 8000,
 101                 .rate_max       = 96000,
 102                 .channels_min   = 1,
 103                 .channels_max   = 2,
 104         },
 105         .ops    = &max98357a_dai_ops,
 106 };
 107
 108 static int max98357a_platform_probe(struct platform_device *pdev)
 109 {
 110         return snd_soc_register_codec(&pdev->dev, &max98357a_codec_driver,
 111                         &max98357a_dai_driver, 1);
 112 }
 113
 114 static int max98357a_platform_remove(struct platform_device *pdev)
 115 {
 116         snd_soc_unregister_codec(&pdev->dev);
 117
 118         return 0;
 119 }
 120
 121 #ifdef CONFIG_OF
 122 static const struct of_device_id max98357a_device_id[] = {
 123         { .compatible = "maxim,max98357a" },
 124         {}
 125 };
 126 MODULE_DEVICE_TABLE(of, max98357a_device_id);
 127 #endif
 128
 129 #ifdef CONFIG_ACPI
 130 static const struct acpi_device_id max98357a_acpi_match[] = {
 131         { "MX98357A", 0 },
 132         {},
 133 };
 134 MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match);
 135 #endif
 136
 137 static struct platform_driver max98357a_platform_driver = {
 138         .driver = {
 139                 .name = "max98357a",
 140                 .of_match_table = of_match_ptr(max98357a_device_id),
 141                 .acpi_match_table = ACPI_PTR(max98357a_acpi_match),
 142         },
 143         .probe  = max98357a_platform_probe,
 144         .remove = max98357a_platform_remove,
 145 };
 146 module_platform_driver(max98357a_platform_driver);
 147
 148 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
 149 MODULE_LICENSE("GPL v2");