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1// SPDX-License-Identifier: GPL-2.0-only2 3#include <linux/gpio/consumer.h>4#include <linux/module.h>5#include <linux/regulator/consumer.h>6#include <sound/soc.h>7 8struct aw8738_priv {9 struct gpio_desc *gpiod_mode;10 unsigned int mode;11};12 13static int aw8738_drv_event(struct snd_soc_dapm_widget *w,14 struct snd_kcontrol *kcontrol, int event)15{16 struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);17 struct aw8738_priv *aw = snd_soc_component_get_drvdata(c);18 int i;19 20 switch (event) {21 case SND_SOC_DAPM_POST_PMU:22 for (i = 0; i < aw->mode; i++) {23 gpiod_set_value_cansleep(aw->gpiod_mode, 0);24 udelay(2);25 gpiod_set_value_cansleep(aw->gpiod_mode, 1);26 udelay(2);27 }28 msleep(40);29 break;30 case SND_SOC_DAPM_PRE_PMD:31 gpiod_set_value_cansleep(aw->gpiod_mode, 0);32 usleep_range(1000, 2000);33 break;34 default:35 WARN(1, "Unexpected event");36 return -EINVAL;37 }38 39 return 0;40}41 42static const struct snd_soc_dapm_widget aw8738_dapm_widgets[] = {43 SND_SOC_DAPM_INPUT("IN"),44 SND_SOC_DAPM_OUT_DRV_E("DRV", SND_SOC_NOPM, 0, 0, NULL, 0, aw8738_drv_event,45 SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),46 SND_SOC_DAPM_OUTPUT("OUT"),47};48 49static const struct snd_soc_dapm_route aw8738_dapm_routes[] = {50 { "DRV", NULL, "IN" },51 { "OUT", NULL, "DRV" },52};53 54static const struct snd_soc_component_driver aw8738_component_driver = {55 .dapm_widgets = aw8738_dapm_widgets,56 .num_dapm_widgets = ARRAY_SIZE(aw8738_dapm_widgets),57 .dapm_routes = aw8738_dapm_routes,58 .num_dapm_routes = ARRAY_SIZE(aw8738_dapm_routes),59};60 61static int aw8738_probe(struct platform_device *pdev)62{63 struct device *dev = &pdev->dev;64 struct aw8738_priv *aw;65 int ret;66 67 aw = devm_kzalloc(dev, sizeof(*aw), GFP_KERNEL);68 if (!aw)69 return -ENOMEM;70 platform_set_drvdata(pdev, aw);71 72 aw->gpiod_mode = devm_gpiod_get(dev, "mode", GPIOD_OUT_LOW);73 if (IS_ERR(aw->gpiod_mode))74 return dev_err_probe(dev, PTR_ERR(aw->gpiod_mode),75 "Failed to get 'mode' gpio");76 77 ret = device_property_read_u32(dev, "awinic,mode", &aw->mode);78 if (ret)79 return -EINVAL;80 81 return devm_snd_soc_register_component(&pdev->dev,82 &aw8738_component_driver,83 NULL, 0);84}85 86#ifdef CONFIG_OF87static const struct of_device_id aw8738_of_match[] = {88 { .compatible = "awinic,aw8738" },89 { }90};91MODULE_DEVICE_TABLE(of, aw8738_of_match);92#endif93 94static struct platform_driver aw8738_driver = {95 .probe = aw8738_probe,96 .driver = {97 .name = "aw8738",98 .of_match_table = of_match_ptr(aw8738_of_match),99 },100};101module_platform_driver(aw8738_driver);102 103MODULE_DESCRIPTION("Awinic AW8738 Amplifier Driver");104MODULE_LICENSE("GPL v2");105