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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simple-mux.c (3446B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (c) 2020 Bootlin SA
      4 * Author: Alexandre Belloni <alexandre.belloni@bootlin.com>
      5 */
      6
      7#include <linux/gpio/consumer.h>
      8#include <linux/module.h>
      9#include <linux/regulator/consumer.h>
     10#include <sound/soc.h>
     11
     12struct simple_mux {
     13	struct gpio_desc *gpiod_mux;
     14	unsigned int mux;
     15};
     16
     17static const char * const simple_mux_texts[] = {
     18	"Input 1", "Input 2"
     19};
     20
     21static SOC_ENUM_SINGLE_EXT_DECL(simple_mux_enum, simple_mux_texts);
     22
     23static int simple_mux_control_get(struct snd_kcontrol *kcontrol,
     24				  struct snd_ctl_elem_value *ucontrol)
     25{
     26	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
     27	struct snd_soc_component *c = snd_soc_dapm_to_component(dapm);
     28	struct simple_mux *priv = snd_soc_component_get_drvdata(c);
     29
     30	ucontrol->value.enumerated.item[0] = priv->mux;
     31
     32	return 0;
     33}
     34
     35static int simple_mux_control_put(struct snd_kcontrol *kcontrol,
     36				  struct snd_ctl_elem_value *ucontrol)
     37{
     38	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kcontrol);
     39	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
     40	struct snd_soc_component *c = snd_soc_dapm_to_component(dapm);
     41	struct simple_mux *priv = snd_soc_component_get_drvdata(c);
     42
     43	if (ucontrol->value.enumerated.item[0] > e->items)
     44		return -EINVAL;
     45
     46	if (priv->mux == ucontrol->value.enumerated.item[0])
     47		return 0;
     48
     49	priv->mux = ucontrol->value.enumerated.item[0];
     50
     51	gpiod_set_value_cansleep(priv->gpiod_mux, priv->mux);
     52
     53	return snd_soc_dapm_mux_update_power(dapm, kcontrol,
     54					     ucontrol->value.enumerated.item[0],
     55					     e, NULL);
     56}
     57
     58static const struct snd_kcontrol_new simple_mux_mux =
     59	SOC_DAPM_ENUM_EXT("Muxer", simple_mux_enum, simple_mux_control_get, simple_mux_control_put);
     60
     61static const struct snd_soc_dapm_widget simple_mux_dapm_widgets[] = {
     62	SND_SOC_DAPM_INPUT("IN1"),
     63	SND_SOC_DAPM_INPUT("IN2"),
     64	SND_SOC_DAPM_MUX("MUX", SND_SOC_NOPM, 0, 0, &simple_mux_mux),
     65	SND_SOC_DAPM_OUTPUT("OUT"),
     66};
     67
     68static const struct snd_soc_dapm_route simple_mux_dapm_routes[] = {
     69	{ "OUT", NULL, "MUX" },
     70	{ "MUX", "Input 1", "IN1" },
     71	{ "MUX", "Input 2", "IN2" },
     72};
     73
     74static const struct snd_soc_component_driver simple_mux_component_driver = {
     75	.dapm_widgets		= simple_mux_dapm_widgets,
     76	.num_dapm_widgets	= ARRAY_SIZE(simple_mux_dapm_widgets),
     77	.dapm_routes		= simple_mux_dapm_routes,
     78	.num_dapm_routes	= ARRAY_SIZE(simple_mux_dapm_routes),
     79};
     80
     81static int simple_mux_probe(struct platform_device *pdev)
     82{
     83	struct device *dev = &pdev->dev;
     84	struct simple_mux *priv;
     85
     86	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
     87	if (!priv)
     88		return -ENOMEM;
     89
     90	dev_set_drvdata(dev, priv);
     91
     92	priv->gpiod_mux = devm_gpiod_get(dev, "mux", GPIOD_OUT_LOW);
     93	if (IS_ERR(priv->gpiod_mux))
     94		return dev_err_probe(dev, PTR_ERR(priv->gpiod_mux),
     95				     "Failed to get 'mux' gpio");
     96
     97	return devm_snd_soc_register_component(dev, &simple_mux_component_driver, NULL, 0);
     98}
     99
    100#ifdef CONFIG_OF
    101static const struct of_device_id simple_mux_ids[] = {
    102	{ .compatible = "simple-audio-mux", },
    103	{ }
    104};
    105MODULE_DEVICE_TABLE(of, simple_mux_ids);
    106#endif
    107
    108static struct platform_driver simple_mux_driver = {
    109	.driver = {
    110		.name = "simple-mux",
    111		.of_match_table = of_match_ptr(simple_mux_ids),
    112	},
    113	.probe = simple_mux_probe,
    114};
    115
    116module_platform_driver(simple_mux_driver);
    117
    118MODULE_DESCRIPTION("ASoC Simple Audio Mux driver");
    119MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");
    120MODULE_LICENSE("GPL");