cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ssm2305.c (2602B)

      1// SPDX-License-Identifier: GPL-2.0
      2//
      3// Analog Devices SSM2305 Amplifier Driver
      4//
      5// Copyright (C) 2018 Pengutronix, Marco Felsch <kernel@pengutronix.de>
      6//
      7
      8#include <linux/gpio/consumer.h>
      9#include <linux/module.h>
     10#include <sound/soc.h>
     11
     12#define DRV_NAME "ssm2305"
     13
     14struct ssm2305 {
     15	/* shutdown gpio  */
     16	struct gpio_desc *gpiod_shutdown;
     17};
     18
     19static int ssm2305_power_event(struct snd_soc_dapm_widget *w,
     20			       struct snd_kcontrol *kctrl, int event)
     21{
     22	struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
     23	struct ssm2305 *data = snd_soc_component_get_drvdata(c);
     24
     25	gpiod_set_value_cansleep(data->gpiod_shutdown,
     26				 SND_SOC_DAPM_EVENT_ON(event));
     27
     28	return 0;
     29}
     30
     31static const struct snd_soc_dapm_widget ssm2305_dapm_widgets[] = {
     32	/* Stereo input/output */
     33	SND_SOC_DAPM_INPUT("L_IN"),
     34	SND_SOC_DAPM_INPUT("R_IN"),
     35	SND_SOC_DAPM_OUTPUT("L_OUT"),
     36	SND_SOC_DAPM_OUTPUT("R_OUT"),
     37
     38	SND_SOC_DAPM_SUPPLY("Power", SND_SOC_NOPM, 0, 0, ssm2305_power_event,
     39			    SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
     40};
     41
     42static const struct snd_soc_dapm_route ssm2305_dapm_routes[] = {
     43	{ "L_OUT", NULL, "L_IN" },
     44	{ "R_OUT", NULL, "R_IN" },
     45	{ "L_IN", NULL, "Power" },
     46	{ "R_IN", NULL, "Power" },
     47};
     48
     49static const struct snd_soc_component_driver ssm2305_component_driver = {
     50	.dapm_widgets		= ssm2305_dapm_widgets,
     51	.num_dapm_widgets	= ARRAY_SIZE(ssm2305_dapm_widgets),
     52	.dapm_routes		= ssm2305_dapm_routes,
     53	.num_dapm_routes	= ARRAY_SIZE(ssm2305_dapm_routes),
     54};
     55
     56static int ssm2305_probe(struct platform_device *pdev)
     57{
     58	struct device *dev = &pdev->dev;
     59	struct ssm2305 *priv;
     60
     61	/* Allocate the private data */
     62	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
     63	if (!priv)
     64		return -ENOMEM;
     65
     66	platform_set_drvdata(pdev, priv);
     67
     68	/* Get shutdown gpio */
     69	priv->gpiod_shutdown = devm_gpiod_get(dev, "shutdown",
     70					      GPIOD_OUT_LOW);
     71	if (IS_ERR(priv->gpiod_shutdown))
     72		return dev_err_probe(dev, PTR_ERR(priv->gpiod_shutdown),
     73				     "Failed to get 'shutdown' gpio\n");
     74
     75	return devm_snd_soc_register_component(dev, &ssm2305_component_driver,
     76					       NULL, 0);
     77}
     78
     79#ifdef CONFIG_OF
     80static const struct of_device_id ssm2305_of_match[] = {
     81	{ .compatible = "adi,ssm2305", },
     82	{ }
     83};
     84MODULE_DEVICE_TABLE(of, ssm2305_of_match);
     85#endif
     86
     87static struct platform_driver ssm2305_driver = {
     88	.driver = {
     89		.name = DRV_NAME,
     90		.of_match_table = of_match_ptr(ssm2305_of_match),
     91	},
     92	.probe = ssm2305_probe,
     93};
     94
     95module_platform_driver(ssm2305_driver);
     96
     97MODULE_DESCRIPTION("ASoC SSM2305 amplifier driver");
     98MODULE_AUTHOR("Marco Felsch <m.felsch@pengutronix.de>");
     99MODULE_LICENSE("GPL v2");