sound/soc/codecs/aw8738.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include <linux/gpio/consumer.h>
   4 #include <linux/module.h>
   5 #include <linux/regulator/consumer.h>
   6 #include <sound/soc.h>
   7
   8 struct aw8738_priv {
   9         struct gpio_desc *gpiod_mode;
  10         unsigned int mode;
  11 };
  12
  13 static int aw8738_drv_event(struct snd_soc_dapm_widget *w,
  14                             struct snd_kcontrol *kcontrol, int event)
  15 {
  16         struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
  17         struct aw8738_priv *aw = snd_soc_component_get_drvdata(c);
  18         int i;
  19
  20         switch (event) {
  21         case SND_SOC_DAPM_POST_PMU:
  22                 for (i = 0; i < aw->mode; i++) {
  23                         gpiod_set_value_cansleep(aw->gpiod_mode, 0);
  24                         udelay(2);
  25                         gpiod_set_value_cansleep(aw->gpiod_mode, 1);
  26                         udelay(2);
  27                 }
  28                 msleep(40);
  29                 break;
  30         case SND_SOC_DAPM_PRE_PMD:
  31                 gpiod_set_value_cansleep(aw->gpiod_mode, 0);
  32                 usleep_range(1000, 2000);
  33                 break;
  34         default:
  35                 WARN(1, "Unexpected event");
  36                 return -EINVAL;
  37         }
  38
  39         return 0;
  40 }
  41
  42 static const struct snd_soc_dapm_widget aw8738_dapm_widgets[] = {
  43         SND_SOC_DAPM_INPUT("IN"),
  44         SND_SOC_DAPM_OUT_DRV_E("DRV", SND_SOC_NOPM, 0, 0, NULL, 0, aw8738_drv_event,
  45                                SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
  46         SND_SOC_DAPM_OUTPUT("OUT"),
  47 };
  48
  49 static const struct snd_soc_dapm_route aw8738_dapm_routes[] = {
  50         { "DRV", NULL, "IN" },
  51         { "OUT", NULL, "DRV" },
  52 };
  53
  54 static const struct snd_soc_component_driver aw8738_component_driver = {
  55         .dapm_widgets = aw8738_dapm_widgets,
  56         .num_dapm_widgets = ARRAY_SIZE(aw8738_dapm_widgets),
  57         .dapm_routes = aw8738_dapm_routes,
  58         .num_dapm_routes = ARRAY_SIZE(aw8738_dapm_routes),
  59 };
  60
  61 static int aw8738_probe(struct platform_device *pdev)
  62 {
  63         struct device *dev = &pdev->dev;
  64         struct aw8738_priv *aw;
  65         int ret;
  66
  67         aw = devm_kzalloc(dev, sizeof(*aw), GFP_KERNEL);
  68         if (!aw)
  69                 return -ENOMEM;
  70         platform_set_drvdata(pdev, aw);
  71
  72         aw->gpiod_mode = devm_gpiod_get(dev, "mode", GPIOD_OUT_LOW);
  73         if (IS_ERR(aw->gpiod_mode))
  74                 return dev_err_probe(dev, PTR_ERR(aw->gpiod_mode),
  75                                      "Failed to get 'mode' gpio");
  76
  77         ret = device_property_read_u32(dev, "awinic,mode", &aw->mode);
  78         if (ret)
  79                 return -EINVAL;
  80
  81         return devm_snd_soc_register_component(&pdev->dev,
  82                                                &aw8738_component_driver,
  83                                                NULL, 0);
  84 }
  85
  86 #ifdef CONFIG_OF
  87 static const struct of_device_id aw8738_of_match[] = {
  88         { .compatible = "awinic,aw8738" },
  89         { }
  90 };
  91 MODULE_DEVICE_TABLE(of, aw8738_of_match);
  92 #endif
  93
  94 static struct platform_driver aw8738_driver = {
  95         .probe  = aw8738_probe,
  96         .driver = {
  97                 .name = "aw8738",
  98                 .of_match_table = of_match_ptr(aw8738_of_match),
  99         },
 100 };
 101 module_platform_driver(aw8738_driver);
 102
 103 MODULE_DESCRIPTION("Awinic AW8738 Amplifier Driver");
 104 MODULE_LICENSE("GPL v2");