kernel/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/device.h>
  16 #include <linux/err.h>
  17 #include <linux/gpio.h>
  18 #include <linux/gpio/consumer.h>
  19 #include <linux/kernel.h>
  20 #include <linux/mod_devicetable.h>
  21 #include <linux/module.h>
  22 #include <linux/of.h>
  23 #include <linux/platform_device.h>
  24 #include <sound/pcm.h>
  25 #include <sound/soc.h>
  26 #include <sound/soc-dai.h>
  27 #include <sound/soc-dapm.h>
  28
  29 static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,
  30                 int cmd, struct snd_soc_dai *dai)
  31 {
  32         struct gpio_desc *sdmode = snd_soc_dai_get_drvdata(dai);
  33
  34         if (!sdmode)
  35                 return 0;
  36
  37         switch (cmd) {
  38         case SNDRV_PCM_TRIGGER_START:
  39         case SNDRV_PCM_TRIGGER_RESUME:
  40         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
  41                 gpiod_set_value(sdmode, 1);
  42                 break;
  43         case SNDRV_PCM_TRIGGER_STOP:
  44         case SNDRV_PCM_TRIGGER_SUSPEND:
  45         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
  46                 gpiod_set_value(sdmode, 0);
  47                 break;
  48         }
  49
  50         return 0;
  51 }
  52
  53 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
  54         SND_SOC_DAPM_OUTPUT("Speaker"),
  55 };
  56
  57 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
  58         {"Speaker", NULL, "HiFi Playback"},
  59 };
  60
  61 static int max98357a_codec_probe(struct snd_soc_codec *codec)
  62 {
  63         struct gpio_desc *sdmode;
  64
  65         sdmode = devm_gpiod_get_optional(codec->dev, "sdmode", GPIOD_OUT_LOW);
  66         if (IS_ERR(sdmode))
  67                 return PTR_ERR(sdmode);
  68
  69         snd_soc_codec_set_drvdata(codec, sdmode);
  70
  71         return 0;
  72 }
  73
  74 static struct snd_soc_codec_driver max98357a_codec_driver = {
  75         .probe                  = max98357a_codec_probe,
  76         .dapm_widgets           = max98357a_dapm_widgets,
  77         .num_dapm_widgets       = ARRAY_SIZE(max98357a_dapm_widgets),
  78         .dapm_routes            = max98357a_dapm_routes,
  79         .num_dapm_routes        = ARRAY_SIZE(max98357a_dapm_routes),
  80 };
  81
  82 static const struct snd_soc_dai_ops max98357a_dai_ops = {
  83         .trigger        = max98357a_daiops_trigger,
  84 };
  85
  86 static struct snd_soc_dai_driver max98357a_dai_driver = {
  87         .name = "HiFi",
  88         .playback = {
  89                 .stream_name    = "HiFi Playback",
  90                 .formats        = SNDRV_PCM_FMTBIT_S16 |
  91                                         SNDRV_PCM_FMTBIT_S24 |
  92                                         SNDRV_PCM_FMTBIT_S32,
  93                 .rates          = SNDRV_PCM_RATE_8000 |
  94                                         SNDRV_PCM_RATE_16000 |
  95                                         SNDRV_PCM_RATE_48000 |
  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 snd_soc_register_codec(&pdev->dev, &max98357a_codec_driver,
 108                         &max98357a_dai_driver, 1);
 109 }
 110
 111 static int max98357a_platform_remove(struct platform_device *pdev)
 112 {
 113         snd_soc_unregister_codec(&pdev->dev);
 114
 115         return 0;
 116 }
 117
 118 #ifdef CONFIG_OF
 119 static const struct of_device_id max98357a_device_id[] = {
 120         { .compatible = "maxim,max98357a" },
 121         {}
 122 };
 123 MODULE_DEVICE_TABLE(of, max98357a_device_id);
 124 #endif
 125
 126 static struct platform_driver max98357a_platform_driver = {
 127         .driver = {
 128                 .name = "max98357a",
 129                 .of_match_table = of_match_ptr(max98357a_device_id),
 130         },
 131         .probe  = max98357a_platform_probe,
 132         .remove = max98357a_platform_remove,
 133 };
 134 module_platform_driver(max98357a_platform_driver);
 135
 136 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
 137 MODULE_LICENSE("GPL v2");