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/delay.h>
   9 #include <linux/device.h>
  10 #include <linux/err.h>
  11 #include <linux/gpio.h>
  12 #include <linux/gpio/consumer.h>
  13 #include <linux/kernel.h>
  14 #include <linux/mod_devicetable.h>
  15 #include <linux/module.h>
  16 #include <linux/of.h>
  17 #include <linux/platform_device.h>
  18 #include <sound/pcm.h>
  19 #include <sound/soc.h>
  20 #include <sound/soc-dai.h>
  21 #include <sound/soc-dapm.h>
  22
  23 struct max98357a_priv {
  24         struct gpio_desc *sdmode;
  25         unsigned int sdmode_delay;
  26 };
  27
  28 static int max98357a_sdmode_event(struct snd_soc_dapm_widget *w,
  29                 struct snd_kcontrol *kcontrol, int event)
  30 {
  31         struct snd_soc_component *component =
  32                 snd_soc_dapm_to_component(w->dapm);
  33         struct max98357a_priv *max98357a =
  34                 snd_soc_component_get_drvdata(component);
  35
  36         if (!max98357a->sdmode)
  37                 return 0;
  38
  39         if (event & SND_SOC_DAPM_POST_PMU) {
  40                 msleep(max98357a->sdmode_delay);
  41                 gpiod_set_value(max98357a->sdmode, 1);
  42                 dev_dbg(component->dev, "set sdmode to 1");
  43         } else if (event & SND_SOC_DAPM_PRE_PMD) {
  44                 gpiod_set_value(max98357a->sdmode, 0);
  45                 dev_dbg(component->dev, "set sdmode to 0");
  46         }
  47
  48         return 0;
  49 }
  50
  51 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
  52         SND_SOC_DAPM_OUTPUT("Speaker"),
  53         SND_SOC_DAPM_OUT_DRV_E("SD_MODE", SND_SOC_NOPM, 0, 0, NULL, 0,
  54                         max98357a_sdmode_event,
  55                         SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
  56 };
  57
  58 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
  59         {"SD_MODE", NULL, "HiFi Playback"},
  60         {"Speaker", NULL, "SD_MODE"},
  61 };
  62
  63 static const struct snd_soc_component_driver max98357a_component_driver = {
  64         .dapm_widgets           = max98357a_dapm_widgets,
  65         .num_dapm_widgets       = ARRAY_SIZE(max98357a_dapm_widgets),
  66         .dapm_routes            = max98357a_dapm_routes,
  67         .num_dapm_routes        = ARRAY_SIZE(max98357a_dapm_routes),
  68         .idle_bias_on           = 1,
  69         .use_pmdown_time        = 1,
  70         .endianness             = 1,
  71         .non_legacy_dai_naming  = 1,
  72 };
  73
  74 static struct snd_soc_dai_driver max98357a_dai_driver = {
  75         .name = "HiFi",
  76         .playback = {
  77                 .stream_name    = "HiFi Playback",
  78                 .formats        = SNDRV_PCM_FMTBIT_S16 |
  79                                         SNDRV_PCM_FMTBIT_S24 |
  80                                         SNDRV_PCM_FMTBIT_S32,
  81                 .rates          = SNDRV_PCM_RATE_8000 |
  82                                         SNDRV_PCM_RATE_16000 |
  83                                         SNDRV_PCM_RATE_32000 |
  84                                         SNDRV_PCM_RATE_44100 |
  85                                         SNDRV_PCM_RATE_48000 |
  86                                         SNDRV_PCM_RATE_88200 |
  87                                         SNDRV_PCM_RATE_96000,
  88                 .rate_min       = 8000,
  89                 .rate_max       = 96000,
  90                 .channels_min   = 1,
  91                 .channels_max   = 2,
  92         },
  93 };
  94
  95 static int max98357a_platform_probe(struct platform_device *pdev)
  96 {
  97         struct max98357a_priv *max98357a;
  98         int ret;
  99
 100         max98357a = devm_kzalloc(&pdev->dev, sizeof(*max98357a), GFP_KERNEL);
 101         if (!max98357a)
 102                 return -ENOMEM;
 103
 104         max98357a->sdmode = devm_gpiod_get_optional(&pdev->dev,
 105                                 "sdmode", GPIOD_OUT_LOW);
 106         if (IS_ERR(max98357a->sdmode))
 107                 return PTR_ERR(max98357a->sdmode);
 108
 109         ret = device_property_read_u32(&pdev->dev, "sdmode-delay",
 110                                         &max98357a->sdmode_delay);
 111         if (ret) {
 112                 max98357a->sdmode_delay = 0;
 113                 dev_dbg(&pdev->dev,
 114                         "no optional property 'sdmode-delay' found, "
 115                         "default: no delay\n");
 116         }
 117
 118         dev_set_drvdata(&pdev->dev, max98357a);
 119
 120         return devm_snd_soc_register_component(&pdev->dev,
 121                         &max98357a_component_driver,
 122                         &max98357a_dai_driver, 1);
 123 }
 124
 125 #ifdef CONFIG_OF
 126 static const struct of_device_id max98357a_device_id[] = {
 127         { .compatible = "maxim,max98357a" },
 128         {}
 129 };
 130 MODULE_DEVICE_TABLE(of, max98357a_device_id);
 131 #endif
 132
 133 #ifdef CONFIG_ACPI
 134 static const struct acpi_device_id max98357a_acpi_match[] = {
 135         { "MX98357A", 0 },
 136         { "MX98360A", 0 },
 137         {},
 138 };
 139 MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match);
 140 #endif
 141
 142 static struct platform_driver max98357a_platform_driver = {
 143         .driver = {
 144                 .name = "max98357a",
 145                 .of_match_table = of_match_ptr(max98357a_device_id),
 146                 .acpi_match_table = ACPI_PTR(max98357a_acpi_match),
 147         },
 148         .probe  = max98357a_platform_probe,
 149 };
 150 module_platform_driver(max98357a_platform_driver);
 151
 152 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
 153 MODULE_LICENSE("GPL v2");