1/*
  2 * Copyright (c) 2017 BayLibre, SAS.
  3 * Author: Jerome Brunet <jbrunet@baylibre.com>
  4 *
  5 * This program is free software; you can redistribute it and/or modify
  6 * it under the terms of version 2 of the GNU General Public License as
  7 * published by the Free Software Foundation.
  8 *
  9 * This program is distributed in the hope that it will be useful, but
 10 * WITHOUT ANY WARRANTY; without even the implied warranty of
 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 12 * General Public License for more details.
 13 *
 14 * You should have received a copy of the GNU General Public License
 15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 16 * The full GNU General Public License is included in this distribution
 17 * in the file called COPYING.
 18 */
 19
 20#include <linux/gpio/consumer.h>
 21#include <linux/module.h>
 22#include <sound/soc.h>
 23
 24#define DRV_NAME "dio2125"
 25
 26struct dio2125 {
 27	struct gpio_desc *gpiod_enable;
 28};
 29
 30static int drv_event(struct snd_soc_dapm_widget *w,
 31		     struct snd_kcontrol *control, int event)
 32{
 33	struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
 34	struct dio2125 *priv = snd_soc_component_get_drvdata(c);
 35	int val;
 36
 37	switch (event) {
 38	case SND_SOC_DAPM_POST_PMU:
 39		val = 1;
 40		break;
 41	case SND_SOC_DAPM_PRE_PMD:
 42		val = 0;
 43		break;
 44	default:
 45		WARN(1, "Unexpected event");
 46		return -EINVAL;
 47	}
 48
 49	gpiod_set_value_cansleep(priv->gpiod_enable, val);
 50
 51	return 0;
 52}
 53
 54static const struct snd_soc_dapm_widget dio2125_dapm_widgets[] = {
 55	SND_SOC_DAPM_INPUT("INL"),
 56	SND_SOC_DAPM_INPUT("INR"),
 57	SND_SOC_DAPM_OUT_DRV_E("DRV", SND_SOC_NOPM, 0, 0, NULL, 0, drv_event,
 58			       (SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD)),
 59	SND_SOC_DAPM_OUTPUT("OUTL"),
 60	SND_SOC_DAPM_OUTPUT("OUTR"),
 61};
 62
 63static const struct snd_soc_dapm_route dio2125_dapm_routes[] = {
 64	{ "DRV", NULL, "INL" },
 65	{ "DRV", NULL, "INR" },
 66	{ "OUTL", NULL, "DRV" },
 67	{ "OUTR", NULL, "DRV" },
 68};
 69
 70static const struct snd_soc_component_driver dio2125_component_driver = {
 71	.dapm_widgets		= dio2125_dapm_widgets,
 72	.num_dapm_widgets	= ARRAY_SIZE(dio2125_dapm_widgets),
 73	.dapm_routes		= dio2125_dapm_routes,
 74	.num_dapm_routes	= ARRAY_SIZE(dio2125_dapm_routes),
 75};
 76
 77static int dio2125_probe(struct platform_device *pdev)
 78{
 79	struct device *dev = &pdev->dev;
 80	struct dio2125 *priv;
 81	int err;
 82
 83	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 84	if (priv == NULL)
 85		return -ENOMEM;
 86	platform_set_drvdata(pdev, priv);
 87
 88	priv->gpiod_enable = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
 89	if (IS_ERR(priv->gpiod_enable)) {
 90		err = PTR_ERR(priv->gpiod_enable);
 91		if (err != -EPROBE_DEFER)
 92			dev_err(dev, "Failed to get 'enable' gpio: %d", err);
 93		return err;
 94	}
 95
 96	return devm_snd_soc_register_component(dev, &dio2125_component_driver,
 97					       NULL, 0);
 98}
 99
100#ifdef CONFIG_OF
101static const struct of_device_id dio2125_ids[] = {
102	{ .compatible = "dioo,dio2125", },
103	{ }
104};
105MODULE_DEVICE_TABLE(of, dio2125_ids);
106#endif
107
108static struct platform_driver dio2125_driver = {
109	.driver = {
110		.name = DRV_NAME,
111		.of_match_table = of_match_ptr(dio2125_ids),
112	},
113	.probe = dio2125_probe,
114};
115
116module_platform_driver(dio2125_driver);
117
118MODULE_DESCRIPTION("ASoC DIO2125 output driver");
119MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
120MODULE_LICENSE("GPL");