[linux-2.6-block.git] / sound / soc / codecs / simple-amplifier.c

/*
 * Copyright (c) 2017 BayLibre, SAS.
 * Author: Jerome Brunet <jbrunet@baylibre.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 * The full GNU General Public License is included in this distribution
 * in the file called COPYING.
 */

#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <sound/soc.h>

#define DRV_NAME "simple-amplifier"

struct simple_amp {
	struct gpio_desc *gpiod_enable;
};

static int drv_event(struct snd_soc_dapm_widget *w,
		     struct snd_kcontrol *control, int event)
{
	struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
	struct simple_amp *priv = snd_soc_component_get_drvdata(c);
	int val;

	switch (event) {
	case SND_SOC_DAPM_POST_PMU:
		val = 1;
		break;
	case SND_SOC_DAPM_PRE_PMD:
		val = 0;
		break;
	default:
		WARN(1, "Unexpected event");
		return -EINVAL;
	}

	gpiod_set_value_cansleep(priv->gpiod_enable, val);

	return 0;
}

static const struct snd_soc_dapm_widget simple_amp_dapm_widgets[] = {
	SND_SOC_DAPM_INPUT("INL"),
	SND_SOC_DAPM_INPUT("INR"),
	SND_SOC_DAPM_OUT_DRV_E("DRV", SND_SOC_NOPM, 0, 0, NULL, 0, drv_event,
			       (SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD)),
	SND_SOC_DAPM_OUTPUT("OUTL"),
	SND_SOC_DAPM_OUTPUT("OUTR"),
};

static const struct snd_soc_dapm_route simple_amp_dapm_routes[] = {
	{ "DRV", NULL, "INL" },
	{ "DRV", NULL, "INR" },
	{ "OUTL", NULL, "DRV" },
	{ "OUTR", NULL, "DRV" },
};

static const struct snd_soc_component_driver simple_amp_component_driver = {
	.dapm_widgets		= simple_amp_dapm_widgets,
	.num_dapm_widgets	= ARRAY_SIZE(simple_amp_dapm_widgets),
	.dapm_routes		= simple_amp_dapm_routes,
	.num_dapm_routes	= ARRAY_SIZE(simple_amp_dapm_routes),
};

static int simple_amp_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct simple_amp *priv;
	int err;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (priv == NULL)
		return -ENOMEM;
	platform_set_drvdata(pdev, priv);

	priv->gpiod_enable = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
	if (IS_ERR(priv->gpiod_enable)) {
		err = PTR_ERR(priv->gpiod_enable);
		if (err != -EPROBE_DEFER)
			dev_err(dev, "Failed to get 'enable' gpio: %d", err);
		return err;
	}

	return devm_snd_soc_register_component(dev,
					       &simple_amp_component_driver,
					       NULL, 0);
}

#ifdef CONFIG_OF
static const struct of_device_id simple_amp_ids[] = {
	{ .compatible = "dioo,dio2125", },
	{ .compatible = "simple-audio-amplifier", },
	{ }
};
MODULE_DEVICE_TABLE(of, simple_amp_ids);
#endif

static struct platform_driver simple_amp_driver = {
	.driver = {
		.name = DRV_NAME,
		.of_match_table = of_match_ptr(simple_amp_ids),
	},
	.probe = simple_amp_probe,
};

module_platform_driver(simple_amp_driver);

MODULE_DESCRIPTION("ASoC Simple Audio Amplifier driver");
MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
85825d5e JB	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
8d881bb6	24	#define DRV_NAME "simple-amplifier"
85825d5e	25
8d881bb6	26	struct simple_amp {
85825d5e JB	27	struct gpio_desc *gpiod_enable;
	28	};
	29
	30	static 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);
8d881bb6	34	struct simple_amp *priv = snd_soc_component_get_drvdata(c);
85825d5e JB	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
ea2a2ad1	49	gpiod_set_value_cansleep(priv->gpiod_enable, val);
85825d5e JB	50
	51	return 0;
	52	}
	53
8d881bb6	54	static const struct snd_soc_dapm_widget simple_amp_dapm_widgets[] = {
85825d5e JB	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
8d881bb6	63	static const struct snd_soc_dapm_route simple_amp_dapm_routes[] = {
85825d5e JB	64	{ "DRV", NULL, "INL" },
	65	{ "DRV", NULL, "INR" },
	66	{ "OUTL", NULL, "DRV" },
	67	{ "OUTR", NULL, "DRV" },
	68	};
	69
8d881bb6 JB	70	static const struct snd_soc_component_driver simple_amp_component_driver = {
	71	.dapm_widgets = simple_amp_dapm_widgets,
	72	.num_dapm_widgets = ARRAY_SIZE(simple_amp_dapm_widgets),
	73	.dapm_routes = simple_amp_dapm_routes,
	74	.num_dapm_routes = ARRAY_SIZE(simple_amp_dapm_routes),
85825d5e JB	75	};
85825d5e JB	76
8d881bb6	77	static int simple_amp_probe(struct platform_device *pdev)
85825d5e JB	78	{
85825d5e JB	79	struct device *dev = &pdev->dev;
8d881bb6	80	struct simple_amp *priv;
85825d5e JB	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
8d881bb6 JB	96	return devm_snd_soc_register_component(dev,
8d881bb6 JB	97	&simple_amp_component_driver,
85825d5e JB	98	NULL, 0);
	99	}
	100
	101	#ifdef CONFIG_OF
8d881bb6	102	static const struct of_device_id simple_amp_ids[] = {
85825d5e	103	{ .compatible = "dioo,dio2125", },
8ed237e8	104	{ .compatible = "simple-audio-amplifier", },
85825d5e JB	105	{ }
85825d5e JB	106	};
8d881bb6	107	MODULE_DEVICE_TABLE(of, simple_amp_ids);
85825d5e JB	108	#endif
85825d5e JB	109
8d881bb6	110	static struct platform_driver simple_amp_driver = {
85825d5e JB	111	.driver = {
85825d5e JB	112	.name = DRV_NAME,
8d881bb6	113	.of_match_table = of_match_ptr(simple_amp_ids),
85825d5e	114	},
8d881bb6	115	.probe = simple_amp_probe,
85825d5e JB	116	};
85825d5e JB	117
8d881bb6	118	module_platform_driver(simple_amp_driver);
85825d5e	119
8d881bb6	120	MODULE_DESCRIPTION("ASoC Simple Audio Amplifier driver");
85825d5e JB	121	MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
85825d5e JB	122	MODULE_LICENSE("GPL");