sound/soc/codecs/ssm2305.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Analog Devices SSM2305 Amplifier Driver
   4 //
   5 // Copyright (C) 2018 Pengutronix, Marco Felsch <kernel@pengutronix.de>
   6 //
   7
   8 #include <linux/gpio/consumer.h>
   9 #include <linux/module.h>
  10 #include <sound/soc.h>
  11
  12 #define DRV_NAME "ssm2305"
  13
  14 struct ssm2305 {
  15         /* shutdown gpio  */
  16         struct gpio_desc *gpiod_shutdown;
  17 };
  18
  19 static int ssm2305_power_event(struct snd_soc_dapm_widget *w,
  20                                struct snd_kcontrol *kctrl, int event)
  21 {
  22         struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
  23         struct ssm2305 *data = snd_soc_component_get_drvdata(c);
  24
  25         gpiod_set_value_cansleep(data->gpiod_shutdown,
  26                                  SND_SOC_DAPM_EVENT_ON(event));
  27
  28         return 0;
  29 }
  30
  31 static const struct snd_soc_dapm_widget ssm2305_dapm_widgets[] = {
  32         /* Stereo input/output */
  33         SND_SOC_DAPM_INPUT("L_IN"),
  34         SND_SOC_DAPM_INPUT("R_IN"),
  35         SND_SOC_DAPM_OUTPUT("L_OUT"),
  36         SND_SOC_DAPM_OUTPUT("R_OUT"),
  37
  38         SND_SOC_DAPM_SUPPLY("Power", SND_SOC_NOPM, 0, 0, ssm2305_power_event,
  39                             SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
  40 };
  41
  42 static const struct snd_soc_dapm_route ssm2305_dapm_routes[] = {
  43         { "L_OUT", NULL, "L_IN" },
  44         { "R_OUT", NULL, "R_IN" },
  45         { "L_IN", NULL, "Power" },
  46         { "R_IN", NULL, "Power" },
  47 };
  48
  49 static const struct snd_soc_component_driver ssm2305_component_driver = {
  50         .dapm_widgets           = ssm2305_dapm_widgets,
  51         .num_dapm_widgets       = ARRAY_SIZE(ssm2305_dapm_widgets),
  52         .dapm_routes            = ssm2305_dapm_routes,
  53         .num_dapm_routes        = ARRAY_SIZE(ssm2305_dapm_routes),
  54 };
  55
  56 static int ssm2305_probe(struct platform_device *pdev)
  57 {
  58         struct device *dev = &pdev->dev;
  59         struct ssm2305 *priv;
  60         int err;
  61
  62         /* Allocate the private data */
  63         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  64         if (!priv)
  65                 return -ENOMEM;
  66
  67         platform_set_drvdata(pdev, priv);
  68
  69         /* Get shutdown gpio */
  70         priv->gpiod_shutdown = devm_gpiod_get(dev, "shutdown",
  71                                               GPIOD_OUT_LOW);
  72         if (IS_ERR(priv->gpiod_shutdown)) {
  73                 err = PTR_ERR(priv->gpiod_shutdown);
  74                 if (err != -EPROBE_DEFER)
  75                         dev_err(dev, "Failed to get 'shutdown' gpio: %d\n",
  76                                 err);
  77                 return err;
  78         }
  79
  80         return devm_snd_soc_register_component(dev, &ssm2305_component_driver,
  81                                                NULL, 0);
  82 }
  83
  84 #ifdef CONFIG_OF
  85 static const struct of_device_id ssm2305_of_match[] = {
  86         { .compatible = "adi,ssm2305", },
  87         { }
  88 };
  89 MODULE_DEVICE_TABLE(of, ssm2305_of_match);
  90 #endif
  91
  92 static struct platform_driver ssm2305_driver = {
  93         .driver = {
  94                 .name = DRV_NAME,
  95                 .of_match_table = of_match_ptr(ssm2305_of_match),
  96         },
  97         .probe = ssm2305_probe,
  98 };
  99
 100 module_platform_driver(ssm2305_driver);
 101
 102 MODULE_DESCRIPTION("ASoC SSM2305 amplifier driver");
 103 MODULE_AUTHOR("Marco Felsch <m.felsch@pengutronix.de>");
 104 MODULE_LICENSE("GPL v2");