cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

aw8738.c (2621B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2
      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_OF
     87static const struct of_device_id aw8738_of_match[] = {
     88	{ .compatible = "awinic,aw8738" },
     89	{ }
     90};
     91MODULE_DEVICE_TABLE(of, aw8738_of_match);
     92#endif
     93
     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");