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 struct max98357a_priv {
  23         struct gpio_desc *sdmode;
  24         unsigned int sdmode_delay;
  25 };
  26
  27 static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,
  28                 int cmd, struct snd_soc_dai *dai)
  29 {
  30         struct max98357a_priv *max98357a = snd_soc_dai_get_drvdata(dai);
  31
  32         if (!max98357a->sdmode)
  33                 return 0;
  34
  35         switch (cmd) {
  36         case SNDRV_PCM_TRIGGER_START:
  37         case SNDRV_PCM_TRIGGER_RESUME:
  38         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
  39                 mdelay(max98357a->sdmode_delay);
  40                 gpiod_set_value(max98357a->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(max98357a->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_OUTPUT("Speaker"),
  54 };
  55
  56 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
  57         {"Speaker", NULL, "HiFi Playback"},
  58 };
  59
  60 static const struct snd_soc_component_driver max98357a_component_driver = {
  61         .dapm_widgets           = max98357a_dapm_widgets,
  62         .num_dapm_widgets       = ARRAY_SIZE(max98357a_dapm_widgets),
  63         .dapm_routes            = max98357a_dapm_routes,
  64         .num_dapm_routes        = ARRAY_SIZE(max98357a_dapm_routes),
  65         .idle_bias_on           = 1,
  66         .use_pmdown_time        = 1,
  67         .endianness             = 1,
  68         .non_legacy_dai_naming  = 1,
  69 };
  70
  71 static const struct snd_soc_dai_ops max98357a_dai_ops = {
  72         .trigger        = max98357a_daiops_trigger,
  73 };
  74
  75 static struct snd_soc_dai_driver max98357a_dai_driver = {
  76         .name = "HiFi",
  77         .playback = {
  78                 .stream_name    = "HiFi Playback",
  79                 .formats        = SNDRV_PCM_FMTBIT_S16 |
  80                                         SNDRV_PCM_FMTBIT_S24 |
  81                                         SNDRV_PCM_FMTBIT_S32,
  82                 .rates          = SNDRV_PCM_RATE_8000 |
  83                                         SNDRV_PCM_RATE_16000 |
  84                                         SNDRV_PCM_RATE_32000 |
  85                                         SNDRV_PCM_RATE_44100 |
  86                                         SNDRV_PCM_RATE_48000 |
  87                                         SNDRV_PCM_RATE_88200 |
  88                                         SNDRV_PCM_RATE_96000,
  89                 .rate_min       = 8000,
  90                 .rate_max       = 96000,
  91                 .channels_min   = 1,
  92                 .channels_max   = 2,
  93         },
  94         .ops    = &max98357a_dai_ops,
  95 };
  96
  97 static int max98357a_platform_probe(struct platform_device *pdev)
  98 {
  99         struct max98357a_priv *max98357a;
 100         int ret;
 101
 102         max98357a = devm_kzalloc(&pdev->dev, sizeof(*max98357a), GFP_KERNEL);
 103         if (!max98357a)
 104                 return -ENOMEM;
 105
 106         max98357a->sdmode = devm_gpiod_get_optional(&pdev->dev,
 107                                 "sdmode", GPIOD_OUT_LOW);
 108         if (IS_ERR(max98357a->sdmode))
 109                 return PTR_ERR(max98357a->sdmode);
 110
 111         ret = device_property_read_u32(&pdev->dev, "sdmode-delay",
 112                                         &max98357a->sdmode_delay);
 113         if (ret) {
 114                 max98357a->sdmode_delay = 0;
 115                 dev_dbg(&pdev->dev,
 116                         "no optional property 'sdmode-delay' found, "
 117                         "default: no delay\n");
 118         }
 119
 120         dev_set_drvdata(&pdev->dev, max98357a);
 121
 122         return devm_snd_soc_register_component(&pdev->dev,
 123                         &max98357a_component_driver,
 124                         &max98357a_dai_driver, 1);
 125 }
 126
 127 #ifdef CONFIG_OF
 128 static const struct of_device_id max98357a_device_id[] = {
 129         { .compatible = "maxim,max98357a" },
 130         {}
 131 };
 132 MODULE_DEVICE_TABLE(of, max98357a_device_id);
 133 #endif
 134
 135 #ifdef CONFIG_ACPI
 136 static const struct acpi_device_id max98357a_acpi_match[] = {
 137         { "MX98357A", 0 },
 138         {},
 139 };
 140 MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match);
 141 #endif
 142
 143 static struct platform_driver max98357a_platform_driver = {
 144         .driver = {
 145                 .name = "max98357a",
 146                 .of_match_table = of_match_ptr(max98357a_device_id),
 147                 .acpi_match_table = ACPI_PTR(max98357a_acpi_match),
 148         },
 149         .probe  = max98357a_platform_probe,
 150 };
 151 module_platform_driver(max98357a_platform_driver);
 152
 153 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
 154 MODULE_LICENSE("GPL v2");