LXR linux/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
  14struct ssm2305 {
  15        /* shutdown gpio  */
  16        struct gpio_desc *gpiod_shutdown;
  17};
  18
  19static 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
  31static 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
  42static 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
  49static 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
  56static 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
  85static const struct of_device_id ssm2305_of_match[] = {
  86        { .compatible = "adi,ssm2305", },
  87        { }
  88};
  89MODULE_DEVICE_TABLE(of, ssm2305_of_match);
  90#endif
  91
  92static 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
 100module_platform_driver(ssm2305_driver);
 101
 102MODULE_DESCRIPTION("ASoC SSM2305 amplifier driver");
 103MODULE_AUTHOR("Marco Felsch <m.felsch@pengutronix.de>");
 104MODULE_LICENSE("GPL v2");
 105