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 delayed_work enable_sdmode_work;
  24         struct gpio_desc *sdmode;
  25         unsigned int sdmode_delay;
  26 };
  27
  28 static void max98357a_enable_sdmode_work(struct work_struct *work)
  29 {
  30         struct max98357a_priv *max98357a =
  31         container_of(work, struct max98357a_priv,
  32                         enable_sdmode_work.work);
  33
  34         gpiod_set_value(max98357a->sdmode, 1);
  35 }
  36
  37 static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,
  38                 int cmd, struct snd_soc_dai *dai)
  39 {
  40         struct max98357a_priv *max98357a = snd_soc_dai_get_drvdata(dai);
  41
  42         if (!max98357a->sdmode)
  43                 return 0;
  44
  45         switch (cmd) {
  46         case SNDRV_PCM_TRIGGER_START:
  47         case SNDRV_PCM_TRIGGER_RESUME:
  48         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
  49                 queue_delayed_work(system_power_efficient_wq,
  50                                 &max98357a->enable_sdmode_work,
  51                                 msecs_to_jiffies(max98357a->sdmode_delay));
  52                 break;
  53         case SNDRV_PCM_TRIGGER_STOP:
  54         case SNDRV_PCM_TRIGGER_SUSPEND:
  55         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
  56                 cancel_delayed_work_sync(&max98357a->enable_sdmode_work);
  57                 gpiod_set_value(max98357a->sdmode, 0);
  58                 break;
  59         }
  60
  61         return 0;
  62 }
  63
  64 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
  65         SND_SOC_DAPM_OUTPUT("Speaker"),
  66 };
  67
  68 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
  69         {"Speaker", NULL, "HiFi Playback"},
  70 };
  71
  72 static const struct snd_soc_component_driver max98357a_component_driver = {
  73         .dapm_widgets           = max98357a_dapm_widgets,
  74         .num_dapm_widgets       = ARRAY_SIZE(max98357a_dapm_widgets),
  75         .dapm_routes            = max98357a_dapm_routes,
  76         .num_dapm_routes        = ARRAY_SIZE(max98357a_dapm_routes),
  77         .idle_bias_on           = 1,
  78         .use_pmdown_time        = 1,
  79         .endianness             = 1,
  80         .non_legacy_dai_naming  = 1,
  81 };
  82
  83 static const 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_32000 |
  97                                         SNDRV_PCM_RATE_44100 |
  98                                         SNDRV_PCM_RATE_48000 |
  99                                         SNDRV_PCM_RATE_88200 |
 100                                         SNDRV_PCM_RATE_96000,
 101                 .rate_min       = 8000,
 102                 .rate_max       = 96000,
 103                 .channels_min   = 1,
 104                 .channels_max   = 2,
 105         },
 106         .ops    = &max98357a_dai_ops,
 107 };
 108
 109 static int max98357a_platform_probe(struct platform_device *pdev)
 110 {
 111         struct max98357a_priv *max98357a;
 112         int ret;
 113
 114         max98357a = devm_kzalloc(&pdev->dev, sizeof(*max98357a), GFP_KERNEL);
 115
 116         if (!max98357a)
 117                 return -ENOMEM;
 118
 119         max98357a->sdmode = devm_gpiod_get_optional(&pdev->dev,
 120                                 "sdmode", GPIOD_OUT_LOW);
 121
 122         if (IS_ERR(max98357a->sdmode))
 123                 return PTR_ERR(max98357a->sdmode);
 124
 125         ret = device_property_read_u32(&pdev->dev, "sdmode-delay",
 126                                         &max98357a->sdmode_delay);
 127
 128         if (ret) {
 129                 max98357a->sdmode_delay = 0;
 130                 dev_dbg(&pdev->dev,
 131                         "no optional property 'sdmode-delay' found, default: no delay\n");
 132         }
 133
 134         dev_set_drvdata(&pdev->dev, max98357a);
 135
 136         INIT_DELAYED_WORK(&max98357a->enable_sdmode_work,
 137                                 max98357a_enable_sdmode_work);
 138
 139         return devm_snd_soc_register_component(&pdev->dev,
 140                         &max98357a_component_driver,
 141                         &max98357a_dai_driver, 1);
 142 }
 143
 144 #ifdef CONFIG_OF
 145 static const struct of_device_id max98357a_device_id[] = {
 146         { .compatible = "maxim,max98357a" },
 147         {}
 148 };
 149 MODULE_DEVICE_TABLE(of, max98357a_device_id);
 150 #endif
 151
 152 #ifdef CONFIG_ACPI
 153 static const struct acpi_device_id max98357a_acpi_match[] = {
 154         { "MX98357A", 0 },
 155         {},
 156 };
 157 MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match);
 158 #endif
 159
 160 static struct platform_driver max98357a_platform_driver = {
 161         .driver = {
 162                 .name = "max98357a",
 163                 .of_match_table = of_match_ptr(max98357a_device_id),
 164                 .acpi_match_table = ACPI_PTR(max98357a_acpi_match),
 165         },
 166         .probe  = max98357a_platform_probe,
 167 };
 168 module_platform_driver(max98357a_platform_driver);
 169
 170 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
 171 MODULE_LICENSE("GPL v2");