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The Awinic AW8738 is a simple audio amplifier using a single GPIO. The main difference to simple-amplifier is that there is a "one-wire pulse control" that allows configuring the amplifier to one of a few pre-defined modes. This can be used to configure the speaker-guard function (primarily the power limit for the amplifier). Add a simple driver that allows setting it up in the device tree with a specified mode number. Signed-off-by: Jonathan Albrieux <jonathan.albrieux@gmail.com> Co-developed-by: Stephan Gerhold <stephan@gerhold.net> Signed-off-by: Stephan Gerhold <stephan@gerhold.net> Link: https://lore.kernel.org/r/20220304102452.26856-3-stephan@gerhold.net Signed-off-by: Mark Brown <broonie@kernel.org>
105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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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struct aw8738_priv {
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struct gpio_desc *gpiod_mode;
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unsigned int mode;
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};
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static int aw8738_drv_event(struct snd_soc_dapm_widget *w,
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struct snd_kcontrol *kcontrol, 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 aw8738_priv *aw = snd_soc_component_get_drvdata(c);
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int i;
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switch (event) {
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case SND_SOC_DAPM_POST_PMU:
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for (i = 0; i < aw->mode; i++) {
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gpiod_set_value_cansleep(aw->gpiod_mode, 0);
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udelay(2);
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gpiod_set_value_cansleep(aw->gpiod_mode, 1);
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udelay(2);
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}
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msleep(40);
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break;
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case SND_SOC_DAPM_PRE_PMD:
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gpiod_set_value_cansleep(aw->gpiod_mode, 0);
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usleep_range(1000, 2000);
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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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return 0;
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}
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static const struct snd_soc_dapm_widget aw8738_dapm_widgets[] = {
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SND_SOC_DAPM_INPUT("IN"),
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SND_SOC_DAPM_OUT_DRV_E("DRV", SND_SOC_NOPM, 0, 0, NULL, 0, aw8738_drv_event,
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SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
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SND_SOC_DAPM_OUTPUT("OUT"),
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};
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static const struct snd_soc_dapm_route aw8738_dapm_routes[] = {
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{ "DRV", NULL, "IN" },
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{ "OUT", NULL, "DRV" },
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};
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static const struct snd_soc_component_driver aw8738_component_driver = {
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.dapm_widgets = aw8738_dapm_widgets,
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.num_dapm_widgets = ARRAY_SIZE(aw8738_dapm_widgets),
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.dapm_routes = aw8738_dapm_routes,
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.num_dapm_routes = ARRAY_SIZE(aw8738_dapm_routes),
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};
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static int aw8738_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct aw8738_priv *aw;
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int ret;
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aw = devm_kzalloc(dev, sizeof(*aw), GFP_KERNEL);
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if (!aw)
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return -ENOMEM;
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platform_set_drvdata(pdev, aw);
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aw->gpiod_mode = devm_gpiod_get(dev, "mode", GPIOD_OUT_LOW);
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if (IS_ERR(aw->gpiod_mode))
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return dev_err_probe(dev, PTR_ERR(aw->gpiod_mode),
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"Failed to get 'mode' gpio");
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ret = device_property_read_u32(dev, "awinic,mode", &aw->mode);
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if (ret)
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return -EINVAL;
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return devm_snd_soc_register_component(&pdev->dev,
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&aw8738_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 aw8738_of_match[] = {
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{ .compatible = "awinic,aw8738" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, aw8738_of_match);
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#endif
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static struct platform_driver aw8738_driver = {
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.probe = aw8738_probe,
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.driver = {
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.name = "aw8738",
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.of_match_table = of_match_ptr(aw8738_of_match),
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},
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};
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module_platform_driver(aw8738_driver);
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MODULE_DESCRIPTION("Awinic AW8738 Amplifier Driver");
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MODULE_LICENSE("GPL v2");
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