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