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/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         int sdmode_switch;
  26 };
  27
  28 static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,
  29                 int cmd, struct snd_soc_dai *dai)
  30 {
  31         struct snd_soc_component *component = dai->component;
  32         struct max98357a_priv *max98357a =
  33                 snd_soc_component_get_drvdata(component);
  34
  35         if (!max98357a->sdmode)
  36                 return 0;
  37
  38         switch (cmd) {
  39         case SNDRV_PCM_TRIGGER_START:
  40         case SNDRV_PCM_TRIGGER_RESUME:
  41         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
  42                 mdelay(max98357a->sdmode_delay);
  43                 if (max98357a->sdmode_switch) {
  44                         gpiod_set_value(max98357a->sdmode, 1);
  45                         dev_dbg(component->dev, "set sdmode to 1");
  46                 }
  47                 break;
  48         case SNDRV_PCM_TRIGGER_STOP:
  49         case SNDRV_PCM_TRIGGER_SUSPEND:
  50         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
  51                 gpiod_set_value(max98357a->sdmode, 0);
  52                 dev_dbg(component->dev, "set sdmode to 0");
  53                 break;
  54         }
  55
  56         return 0;
  57 }
  58
  59 static int max98357a_sdmode_event(struct snd_soc_dapm_widget *w,
  60                 struct snd_kcontrol *kcontrol, int event)
  61 {
  62         struct snd_soc_component *component =
  63                 snd_soc_dapm_to_component(w->dapm);
  64         struct max98357a_priv *max98357a =
  65                 snd_soc_component_get_drvdata(component);
  66
  67         if (event & SND_SOC_DAPM_POST_PMU)
  68                 max98357a->sdmode_switch = 1;
  69         else if (event & SND_SOC_DAPM_POST_PMD)
  70                 max98357a->sdmode_switch = 0;
  71
  72         return 0;
  73 }
  74
  75 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
  76         SND_SOC_DAPM_OUTPUT("Speaker"),
  77         SND_SOC_DAPM_OUT_DRV_E("SD_MODE", SND_SOC_NOPM, 0, 0, NULL, 0,
  78                         max98357a_sdmode_event,
  79                         SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
  80 };
  81
  82 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
  83         {"SD_MODE", NULL, "HiFi Playback"},
  84         {"Speaker", NULL, "SD_MODE"},
  85 };
  86
  87 static const struct snd_soc_component_driver max98357a_component_driver = {
  88         .dapm_widgets           = max98357a_dapm_widgets,
  89         .num_dapm_widgets       = ARRAY_SIZE(max98357a_dapm_widgets),
  90         .dapm_routes            = max98357a_dapm_routes,
  91         .num_dapm_routes        = ARRAY_SIZE(max98357a_dapm_routes),
  92         .idle_bias_on           = 1,
  93         .use_pmdown_time        = 1,
  94         .endianness             = 1,
  95 };
  96
  97 static const struct snd_soc_dai_ops max98357a_dai_ops = {
  98         .trigger        = max98357a_daiops_trigger,
  99 };
 100
 101 static struct snd_soc_dai_driver max98357a_dai_driver = {
 102         .name = "HiFi",
 103         .playback = {
 104                 .stream_name    = "HiFi Playback",
 105                 .formats        = SNDRV_PCM_FMTBIT_S16 |
 106                                         SNDRV_PCM_FMTBIT_S24 |
 107                                         SNDRV_PCM_FMTBIT_S32,
 108                 .rates          = SNDRV_PCM_RATE_8000 |
 109                                         SNDRV_PCM_RATE_16000 |
 110                                         SNDRV_PCM_RATE_32000 |
 111                                         SNDRV_PCM_RATE_44100 |
 112                                         SNDRV_PCM_RATE_48000 |
 113                                         SNDRV_PCM_RATE_88200 |
 114                                         SNDRV_PCM_RATE_96000,
 115                 .rate_min       = 8000,
 116                 .rate_max       = 96000,
 117                 .channels_min   = 1,
 118                 .channels_max   = 2,
 119         },
 120         .ops    = &max98357a_dai_ops,
 121 };
 122
 123 static int max98357a_platform_probe(struct platform_device *pdev)
 124 {
 125         struct max98357a_priv *max98357a;
 126         int ret;
 127
 128         max98357a = devm_kzalloc(&pdev->dev, sizeof(*max98357a), GFP_KERNEL);
 129         if (!max98357a)
 130                 return -ENOMEM;
 131
 132         max98357a->sdmode = devm_gpiod_get_optional(&pdev->dev,
 133                                 "sdmode", GPIOD_OUT_LOW);
 134         if (IS_ERR(max98357a->sdmode))
 135                 return PTR_ERR(max98357a->sdmode);
 136
 137         ret = device_property_read_u32(&pdev->dev, "sdmode-delay",
 138                                         &max98357a->sdmode_delay);
 139         if (ret) {
 140                 max98357a->sdmode_delay = 0;
 141                 dev_dbg(&pdev->dev,
 142                         "no optional property 'sdmode-delay' found, "
 143                         "default: no delay\n");
 144         }
 145
 146         dev_set_drvdata(&pdev->dev, max98357a);
 147
 148         return devm_snd_soc_register_component(&pdev->dev,
 149                         &max98357a_component_driver,
 150                         &max98357a_dai_driver, 1);
 151 }
 152
 153 #ifdef CONFIG_OF
 154 static const struct of_device_id max98357a_device_id[] = {
 155         { .compatible = "maxim,max98357a" },
 156         { .compatible = "maxim,max98360a" },
 157         {}
 158 };
 159 MODULE_DEVICE_TABLE(of, max98357a_device_id);
 160 #endif
 161
 162 #ifdef CONFIG_ACPI
 163 static const struct acpi_device_id max98357a_acpi_match[] = {
 164         { "MX98357A", 0 },
 165         { "MX98360A", 0 },
 166         {},
 167 };
 168 MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match);
 169 #endif
 170
 171 static struct platform_driver max98357a_platform_driver = {
 172         .driver = {
 173                 .name = "max98357a",
 174                 .of_match_table = of_match_ptr(max98357a_device_id),
 175                 .acpi_match_table = ACPI_PTR(max98357a_acpi_match),
 176         },
 177         .probe  = max98357a_platform_probe,
 178 };
 179 module_platform_driver(max98357a_platform_driver);
 180
 181 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
 182 MODULE_LICENSE("GPL v2");