LXR linux/sound/soc/codecs/simple-amplifier.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (c) 2017 BayLibre, SAS.
   4 * Author: Jerome Brunet <jbrunet@baylibre.com>
   5 */
   6
   7#include <linux/gpio/consumer.h>
   8#include <linux/module.h>
   9#include <linux/regulator/consumer.h>
  10#include <sound/soc.h>
  11
  12#define DRV_NAME "simple-amplifier"
  13
  14struct simple_amp {
  15        struct gpio_desc *gpiod_enable;
  16};
  17
  18static int drv_event(struct snd_soc_dapm_widget *w,
  19                     struct snd_kcontrol *control, int event)
  20{
  21        struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
  22        struct simple_amp *priv = snd_soc_component_get_drvdata(c);
  23        int val;
  24
  25        switch (event) {
  26        case SND_SOC_DAPM_POST_PMU:
  27                val = 1;
  28                break;
  29        case SND_SOC_DAPM_PRE_PMD:
  30                val = 0;
  31                break;
  32        default:
  33                WARN(1, "Unexpected event");
  34                return -EINVAL;
  35        }
  36
  37        gpiod_set_value_cansleep(priv->gpiod_enable, val);
  38
  39        return 0;
  40}
  41
  42static const struct snd_soc_dapm_widget simple_amp_dapm_widgets[] = {
  43        SND_SOC_DAPM_INPUT("INL"),
  44        SND_SOC_DAPM_INPUT("INR"),
  45        SND_SOC_DAPM_OUT_DRV_E("DRV", SND_SOC_NOPM, 0, 0, NULL, 0, drv_event,
  46                               (SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD)),
  47        SND_SOC_DAPM_OUTPUT("OUTL"),
  48        SND_SOC_DAPM_OUTPUT("OUTR"),
  49        SND_SOC_DAPM_REGULATOR_SUPPLY("VCC", 20, 0),
  50};
  51
  52static const struct snd_soc_dapm_route simple_amp_dapm_routes[] = {
  53        { "DRV", NULL, "INL" },
  54        { "DRV", NULL, "INR" },
  55        { "OUTL", NULL, "VCC" },
  56        { "OUTR", NULL, "VCC" },
  57        { "OUTL", NULL, "DRV" },
  58        { "OUTR", NULL, "DRV" },
  59};
  60
  61static const struct snd_soc_component_driver simple_amp_component_driver = {
  62        .dapm_widgets           = simple_amp_dapm_widgets,
  63        .num_dapm_widgets       = ARRAY_SIZE(simple_amp_dapm_widgets),
  64        .dapm_routes            = simple_amp_dapm_routes,
  65        .num_dapm_routes        = ARRAY_SIZE(simple_amp_dapm_routes),
  66};
  67
  68static int simple_amp_probe(struct platform_device *pdev)
  69{
  70        struct device *dev = &pdev->dev;
  71        struct simple_amp *priv;
  72        int err;
  73
  74        priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  75        if (priv == NULL)
  76                return -ENOMEM;
  77        platform_set_drvdata(pdev, priv);
  78
  79        priv->gpiod_enable = devm_gpiod_get_optional(dev, "enable",
  80                                                     GPIOD_OUT_LOW);
  81        if (IS_ERR(priv->gpiod_enable)) {
  82                err = PTR_ERR(priv->gpiod_enable);
  83                if (err != -EPROBE_DEFER)
  84                        dev_err(dev, "Failed to get 'enable' gpio: %d", err);
  85                return err;
  86        }
  87
  88        return devm_snd_soc_register_component(dev,
  89                                               &simple_amp_component_driver,
  90                                               NULL, 0);
  91}
  92
  93#ifdef CONFIG_OF
  94static const struct of_device_id simple_amp_ids[] = {
  95        { .compatible = "dioo,dio2125", },
  96        { .compatible = "simple-audio-amplifier", },
  97        { }
  98};
  99MODULE_DEVICE_TABLE(of, simple_amp_ids);
 100#endif
 101
 102static struct platform_driver simple_amp_driver = {
 103        .driver = {
 104                .name = DRV_NAME,
 105                .of_match_table = of_match_ptr(simple_amp_ids),
 106        },
 107        .probe = simple_amp_probe,
 108};
 109
 110module_platform_driver(simple_amp_driver);
 111
 112MODULE_DESCRIPTION("ASoC Simple Audio Amplifier driver");
 113MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
 114MODULE_LICENSE("GPL");
 115