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         switch (cmd) {
  35         case SNDRV_PCM_TRIGGER_START:
  36         case SNDRV_PCM_TRIGGER_RESUME:
  37         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
  38                 gpiod_set_value(sdmode, 1);
  39                 break;
  40         case SNDRV_PCM_TRIGGER_STOP:
  41         case SNDRV_PCM_TRIGGER_SUSPEND:
  42         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
  43                 gpiod_set_value(sdmode, 0);
  44                 break;
  45         }
  46
  47         return 0;
  48 }
  49
  50 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
  51         SND_SOC_DAPM_DAC("SDMode", NULL, SND_SOC_NOPM, 0, 0),
  52         SND_SOC_DAPM_OUTPUT("Speaker"),
  53 };
  54
  55 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
  56         {"Speaker", NULL, "SDMode"},
  57 };
  58
  59 static int max98357a_codec_probe(struct snd_soc_codec *codec)
  60 {
  61         struct gpio_desc *sdmode;
  62
  63         sdmode = devm_gpiod_get(codec->dev, "sdmode");
  64         if (IS_ERR(sdmode)) {
  65                 dev_err(codec->dev, "%s() unable to get sdmode GPIO: %ld\n",
  66                                 __func__, PTR_ERR(sdmode));
  67                 return PTR_ERR(sdmode);
  68         }
  69         gpiod_direction_output(sdmode, 0);
  70         snd_soc_codec_set_drvdata(codec, sdmode);
  71
  72         return 0;
  73 }
  74
  75 static struct snd_soc_codec_driver max98357a_codec_driver = {
  76         .probe                  = max98357a_codec_probe,
  77         .dapm_widgets           = max98357a_dapm_widgets,
  78         .num_dapm_widgets       = ARRAY_SIZE(max98357a_dapm_widgets),
  79         .dapm_routes            = max98357a_dapm_routes,
  80         .num_dapm_routes        = ARRAY_SIZE(max98357a_dapm_routes),
  81 };
  82
  83 static struct snd_soc_dai_ops max98357a_dai_ops = {
  84         .trigger        = max98357a_daiops_trigger,
  85 };
  86
  87 static struct snd_soc_dai_driver max98357a_dai_driver = {
  88         .name = "HiFi",
  89         .playback = {
  90                 .stream_name    = "HiFi Playback",
  91                 .formats        = SNDRV_PCM_FMTBIT_S16 |
  92                                         SNDRV_PCM_FMTBIT_S24 |
  93                                         SNDRV_PCM_FMTBIT_S32,
  94                 .rates          = SNDRV_PCM_RATE_8000 |
  95                                         SNDRV_PCM_RATE_16000 |
  96                                         SNDRV_PCM_RATE_48000 |
  97                                         SNDRV_PCM_RATE_96000,
  98                 .rate_min       = 8000,
  99                 .rate_max       = 96000,
 100                 .channels_min   = 1,
 101                 .channels_max   = 2,
 102         },
 103         .ops    = &max98357a_dai_ops,
 104 };
 105
 106 static int max98357a_platform_probe(struct platform_device *pdev)
 107 {
 108         int ret;
 109
 110         ret = snd_soc_register_codec(&pdev->dev, &max98357a_codec_driver,
 111                         &max98357a_dai_driver, 1);
 112         if (ret)
 113                 dev_err(&pdev->dev, "%s() error registering codec driver: %d\n",
 114                                 __func__, ret);
 115
 116         return ret;
 117 }
 118
 119 static int max98357a_platform_remove(struct platform_device *pdev)
 120 {
 121         snd_soc_unregister_codec(&pdev->dev);
 122
 123         return 0;
 124 }
 125
 126 #ifdef CONFIG_OF
 127 static const struct of_device_id max98357a_device_id[] = {
 128         { .compatible = "maxim,max98357a" },
 129         {}
 130 };
 131 MODULE_DEVICE_TABLE(of, max98357a_device_id);
 132 #endif
 133
 134 static struct platform_driver max98357a_platform_driver = {
 135         .driver = {
 136                 .name = "max98357a",
 137                 .of_match_table = of_match_ptr(max98357a_device_id),
 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");