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 #define DRV_NAME "max98357a"
  30
  31 static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,
  32                 int cmd, struct snd_soc_dai *dai)
  33 {
  34         struct gpio_desc *sdmode = snd_soc_dai_get_drvdata(dai);
  35
  36         switch (cmd) {
  37         case SNDRV_PCM_TRIGGER_START:
  38         case SNDRV_PCM_TRIGGER_RESUME:
  39         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
  40                 gpiod_set_value(sdmode, 1);
  41                 break;
  42         case SNDRV_PCM_TRIGGER_STOP:
  43         case SNDRV_PCM_TRIGGER_SUSPEND:
  44         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
  45                 gpiod_set_value(sdmode, 0);
  46                 break;
  47         }
  48
  49         return 0;
  50 }
  51
  52 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
  53         SND_SOC_DAPM_DAC("SDMode", NULL, SND_SOC_NOPM, 0, 0),
  54         SND_SOC_DAPM_OUTPUT("Speaker"),
  55 };
  56
  57 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
  58         {"Speaker", NULL, "SDMode"},
  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(codec->dev, "sdmode");
  66         if (IS_ERR(sdmode)) {
  67                 dev_err(codec->dev, "%s() unable to get sdmode GPIO: %ld\n",
  68                                 __func__, PTR_ERR(sdmode));
  69                 return PTR_ERR(sdmode);
  70         }
  71         gpiod_direction_output(sdmode, 0);
  72         snd_soc_codec_set_drvdata(codec, sdmode);
  73
  74         return 0;
  75 }
  76
  77 static struct snd_soc_codec_driver max98357a_codec_driver = {
  78         .probe                  = max98357a_codec_probe,
  79         .dapm_widgets           = max98357a_dapm_widgets,
  80         .num_dapm_widgets       = ARRAY_SIZE(max98357a_dapm_widgets),
  81         .dapm_routes            = max98357a_dapm_routes,
  82         .num_dapm_routes        = ARRAY_SIZE(max98357a_dapm_routes),
  83 };
  84
  85 static 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 = DRV_NAME,
  91         .playback = {
  92                 .stream_name    = DRV_NAME "-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         int ret;
 111
 112         ret = snd_soc_register_codec(&pdev->dev, &max98357a_codec_driver,
 113                         &max98357a_dai_driver, 1);
 114         if (ret)
 115                 dev_err(&pdev->dev, "%s() error registering codec driver: %d\n",
 116                                 __func__, ret);
 117
 118         return ret;
 119 }
 120
 121 static int max98357a_platform_remove(struct platform_device *pdev)
 122 {
 123         snd_soc_unregister_codec(&pdev->dev);
 124
 125         return 0;
 126 }
 127
 128 #ifdef CONFIG_OF
 129 static const struct of_device_id max98357a_device_id[] = {
 130         { .compatible = "maxim," DRV_NAME, },
 131         {}
 132 };
 133 MODULE_DEVICE_TABLE(of, max98357a_device_id);
 134 #endif
 135
 136 static struct platform_driver max98357a_platform_driver = {
 137         .driver = {
 138                 .name = DRV_NAME,
 139                 .of_match_table = of_match_ptr(max98357a_device_id),
 140         },
 141         .probe  = max98357a_platform_probe,
 142         .remove = max98357a_platform_remove,
 143 };
 144 module_platform_driver(max98357a_platform_driver);
 145
 146 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
 147 MODULE_LICENSE("GPL v2");
 148 MODULE_ALIAS("platform:" DRV_NAME);