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Viewing changes to buildroot/src/oem-audiosdw-lp1836324-0.6ubuntu1.2/soc/codecs/simple-amplifier.c

  • Committer: Hui Wang
  • Date: 2019-12-13 02:41:40 UTC
  • Revision ID: hui.wang@canonical.com-20191213024140-1cprdcbl3122fn85
insert pc-oem-dkms

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buildroot/src/oem-audiosdw-lp1836324-0.6ubuntu1.2/soc/codecs/simple-amplifier.c
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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 * Copyright (c) 2017 BayLibre, SAS.
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 * Author: Jerome Brunet <jbrunet@baylibre.com>
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 */
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#include <linux/gpio/consumer.h>
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#include <linux/module.h>
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#include <linux/regulator/consumer.h>
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#include <sound/soc.h>
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#define DRV_NAME "simple-amplifier"
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struct simple_amp {
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        struct gpio_desc *gpiod_enable;
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};
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static int drv_event(struct snd_soc_dapm_widget *w,
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                     struct snd_kcontrol *control, int event)
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{
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        struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
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        struct simple_amp *priv = snd_soc_component_get_drvdata(c);
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        int val;
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        switch (event) {
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        case SND_SOC_DAPM_POST_PMU:
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                val = 1;
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                break;
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        case SND_SOC_DAPM_PRE_PMD:
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                val = 0;
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                break;
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        default:
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                WARN(1, "Unexpected event");
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                return -EINVAL;
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        }
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        gpiod_set_value_cansleep(priv->gpiod_enable, val);
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        return 0;
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}
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static const struct snd_soc_dapm_widget simple_amp_dapm_widgets[] = {
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        SND_SOC_DAPM_INPUT("INL"),
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        SND_SOC_DAPM_INPUT("INR"),
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        SND_SOC_DAPM_OUT_DRV_E("DRV", SND_SOC_NOPM, 0, 0, NULL, 0, drv_event,
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                               (SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD)),
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        SND_SOC_DAPM_OUTPUT("OUTL"),
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        SND_SOC_DAPM_OUTPUT("OUTR"),
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        SND_SOC_DAPM_REGULATOR_SUPPLY("VCC", 20, 0),
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};
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static const struct snd_soc_dapm_route simple_amp_dapm_routes[] = {
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        { "DRV", NULL, "INL" },
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        { "DRV", NULL, "INR" },
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        { "OUTL", NULL, "VCC" },
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        { "OUTR", NULL, "VCC" },
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        { "OUTL", NULL, "DRV" },
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        { "OUTR", NULL, "DRV" },
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};
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static const struct snd_soc_component_driver simple_amp_component_driver = {
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        .dapm_widgets           = simple_amp_dapm_widgets,
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        .num_dapm_widgets       = ARRAY_SIZE(simple_amp_dapm_widgets),
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        .dapm_routes            = simple_amp_dapm_routes,
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        .num_dapm_routes        = ARRAY_SIZE(simple_amp_dapm_routes),
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};
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static int simple_amp_probe(struct platform_device *pdev)
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{
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        struct device *dev = &pdev->dev;
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        struct simple_amp *priv;
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        int err;
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        priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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        if (priv == NULL)
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                return -ENOMEM;
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        platform_set_drvdata(pdev, priv);
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        priv->gpiod_enable = devm_gpiod_get_optional(dev, "enable",
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                                                     GPIOD_OUT_LOW);
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        if (IS_ERR(priv->gpiod_enable)) {
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                err = PTR_ERR(priv->gpiod_enable);
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                if (err != -EPROBE_DEFER)
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                        dev_err(dev, "Failed to get 'enable' gpio: %d", err);
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                return err;
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        }
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        return devm_snd_soc_register_component(dev,
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                                               &simple_amp_component_driver,
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                                               NULL, 0);
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}
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#ifdef CONFIG_OF
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static const struct of_device_id simple_amp_ids[] = {
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        { .compatible = "dioo,dio2125", },
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        { .compatible = "simple-audio-amplifier", },
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        { }
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};
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MODULE_DEVICE_TABLE(of, simple_amp_ids);
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#endif
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static struct platform_driver simple_amp_driver = {
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        .driver = {
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                .name = DRV_NAME,
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                .of_match_table = of_match_ptr(simple_amp_ids),
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        },
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        .probe = simple_amp_probe,
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};
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module_platform_driver(simple_amp_driver);
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MODULE_DESCRIPTION("ASoC Simple Audio Amplifier driver");
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MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
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MODULE_LICENSE("GPL");