adau7002.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * ADAU7002 Stereo PDM-to-I2S/TDM converter driver
  4 *
  5 * Copyright 2014-2016 Analog Devices
  6 *  Author: Lars-Peter Clausen <lars@metafoo.de>
  7 */
  8
  9#include <linux/acpi.h>
 10#include <linux/delay.h>
 11#include <linux/init.h>
 12#include <linux/module.h>
 13#include <linux/of.h>
 14#include <linux/platform_device.h>
 15
 16#include <sound/soc.h>
 17
 18struct adau7002_priv {
 19	int wakeup_delay;
 20};
 21
 22static int adau7002_aif_event(struct snd_soc_dapm_widget *w,
 23			      struct snd_kcontrol *kcontrol, int event)
 24{
 25	struct snd_soc_component *component =
 26			snd_soc_dapm_to_component(w->dapm);
 27	struct adau7002_priv *adau7002 =
 28			snd_soc_component_get_drvdata(component);
 29
 30	switch (event) {
 31	case SND_SOC_DAPM_POST_PMU:
 32		if (adau7002->wakeup_delay)
 33			msleep(adau7002->wakeup_delay);
 34		break;
 35	}
 36
 37	return 0;
 38}
 39
 40static int adau7002_component_probe(struct snd_soc_component *component)
 41{
 42	struct adau7002_priv *adau7002;
 43
 44	adau7002 = devm_kzalloc(component->dev, sizeof(*adau7002),
 45				GFP_KERNEL);
 46	if (!adau7002)
 47		return -ENOMEM;
 48
 49	device_property_read_u32(component->dev, "wakeup-delay-ms",
 50				 &adau7002->wakeup_delay);
 51
 52	snd_soc_component_set_drvdata(component, adau7002);
 53
 54	return 0;
 55}
 56
 57static const struct snd_soc_dapm_widget adau7002_widgets[] = {
 58	SND_SOC_DAPM_AIF_OUT_E("ADAU AIF", "Capture", 0,
 59			       SND_SOC_NOPM, 0, 0, adau7002_aif_event,
 60			       SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
 61	SND_SOC_DAPM_INPUT("PDM_DAT"),
 62	SND_SOC_DAPM_REGULATOR_SUPPLY("IOVDD", 0, 0),
 63};
 64
 65static const struct snd_soc_dapm_route adau7002_routes[] = {
 66	{ "ADAU AIF", NULL, "PDM_DAT"},
 67	{ "Capture", NULL, "PDM_DAT" },
 68	{ "Capture", NULL, "IOVDD" },
 69};
 70
 71static struct snd_soc_dai_driver adau7002_dai = {
 72	.name = "adau7002-hifi",
 73	.capture = {
 74		.stream_name = "Capture",
 75		.channels_min = 2,
 76		.channels_max = 2,
 77		.rates = SNDRV_PCM_RATE_8000_96000,
 78		.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S18_3LE |
 79			SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE |
 80			SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S32_LE,
 81		.sig_bits = 20,
 82	},
 83};
 84
 85static const struct snd_soc_component_driver adau7002_component_driver = {
 86	.probe			= adau7002_component_probe,
 87	.dapm_widgets		= adau7002_widgets,
 88	.num_dapm_widgets	= ARRAY_SIZE(adau7002_widgets),
 89	.dapm_routes		= adau7002_routes,
 90	.num_dapm_routes	= ARRAY_SIZE(adau7002_routes),
 91	.idle_bias_on		= 1,
 92	.use_pmdown_time	= 1,
 93	.endianness		= 1,
 94};
 95
 96static int adau7002_probe(struct platform_device *pdev)
 97{
 98	return devm_snd_soc_register_component(&pdev->dev,
 99			&adau7002_component_driver,
100			&adau7002_dai, 1);
101}
102
103#ifdef CONFIG_OF
104static const struct of_device_id adau7002_dt_ids[] = {
105	{ .compatible = "adi,adau7002", },
106	{ }
107};
108MODULE_DEVICE_TABLE(of, adau7002_dt_ids);
109#endif
110
111#ifdef CONFIG_ACPI
112static const struct acpi_device_id adau7002_acpi_match[] = {
113	{ "ADAU7002", 0 },
114	{},
115};
116MODULE_DEVICE_TABLE(acpi, adau7002_acpi_match);
117#endif
118
119static struct platform_driver adau7002_driver = {
120	.driver = {
121		.name = "adau7002",
122		.of_match_table	= of_match_ptr(adau7002_dt_ids),
123		.acpi_match_table = ACPI_PTR(adau7002_acpi_match),
124	},
125	.probe = adau7002_probe,
126};
127module_platform_driver(adau7002_driver);
128
129MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
130MODULE_DESCRIPTION("ADAU7002 Stereo PDM-to-I2S/TDM Converter driver");
131MODULE_LICENSE("GPL v2");