123 lines
3.3 KiB
C
123 lines
3.3 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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* The full GNU General Public License is included in this distribution
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* in the file called COPYING.
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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 <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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};
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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, "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(dev, "enable", 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");
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