pcm1754.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * PCM1754 DAC ASoC codec driver
  4 *
  5 * Copyright (c) 2022 Alvin Šipraga <alsi@bang-olufsen.dk>
  6 * Copyright (c) 2025 Stefan Kerkmann <s.kerkmann@pengutronix.de>
  7 */
  8
  9#include <linux/gpio/consumer.h>
 10#include <linux/module.h>
 11#include <linux/regulator/consumer.h>
 12
 13#include <sound/pcm_params.h>
 14#include <sound/soc.h>
 15
 16struct pcm1754_priv {
 17	unsigned int format;
 18	struct gpio_desc *gpiod_mute;
 19	struct gpio_desc *gpiod_format;
 20};
 21
 22static int pcm1754_set_dai_fmt(struct snd_soc_dai *codec_dai,
 23				   unsigned int format)
 24{
 25	struct snd_soc_component *component = codec_dai->component;
 26	struct pcm1754_priv *priv = snd_soc_component_get_drvdata(component);
 27
 28	priv->format = format;
 29
 30	return 0;
 31}
 32
 33static int pcm1754_hw_params(struct snd_pcm_substream *substream,
 34				 struct snd_pcm_hw_params *params,
 35				 struct snd_soc_dai *codec_dai)
 36{
 37	struct snd_soc_component *component = codec_dai->component;
 38	struct pcm1754_priv *priv = snd_soc_component_get_drvdata(component);
 39	int format;
 40
 41	switch (priv->format & SND_SOC_DAIFMT_FORMAT_MASK) {
 42	case SND_SOC_DAIFMT_RIGHT_J:
 43		switch (params_width(params)) {
 44		case 16:
 45			format = 1;
 46			break;
 47		default:
 48			return -EINVAL;
 49		}
 50		break;
 51	case SND_SOC_DAIFMT_I2S:
 52		switch (params_width(params)) {
 53		case 16:
 54			fallthrough;
 55		case 24:
 56			format = 0;
 57			break;
 58		default:
 59			return -EINVAL;
 60		}
 61		break;
 62	default:
 63		dev_err(component->dev, "Invalid DAI format\n");
 64		return -EINVAL;
 65	}
 66
 67	gpiod_set_value_cansleep(priv->gpiod_format, format);
 68
 69	return 0;
 70}
 71
 72static int pcm1754_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
 73{
 74	struct pcm1754_priv *priv = snd_soc_component_get_drvdata(dai->component);
 75
 76	gpiod_set_value_cansleep(priv->gpiod_mute, mute);
 77
 78	return 0;
 79}
 80
 81static const struct snd_soc_dai_ops pcm1754_dai_ops = {
 82	.set_fmt = pcm1754_set_dai_fmt,
 83	.hw_params = pcm1754_hw_params,
 84	.mute_stream = pcm1754_mute_stream,
 85};
 86
 87static const struct snd_soc_dai_driver pcm1754_dai = {
 88	.name = "pcm1754",
 89	.playback = {
 90		.stream_name	= "Playback",
 91		.channels_min	= 2,
 92		.channels_max	= 2,
 93		.rates		= SNDRV_PCM_RATE_CONTINUOUS,
 94		.rate_min	= 5000,
 95		.rate_max	= 200000,
 96		.formats	= SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE
 97	},
 98	.ops = &pcm1754_dai_ops,
 99};
100
101static const struct snd_soc_dapm_widget pcm1754_dapm_widgets[] = {
102	SND_SOC_DAPM_REGULATOR_SUPPLY("VCC", 0, 0),
103
104	SND_SOC_DAPM_DAC("DAC1", "Channel 1 Playback", SND_SOC_NOPM, 0, 0),
105	SND_SOC_DAPM_DAC("DAC2", "Channel 2 Playback", SND_SOC_NOPM, 0, 0),
106
107	SND_SOC_DAPM_OUTPUT("VOUTL"),
108	SND_SOC_DAPM_OUTPUT("VOUTR"),
109};
110
111static const struct snd_soc_dapm_route pcm1754_dapm_routes[] = {
112	{ "DAC1", NULL, "Playback" },
113	{ "DAC2", NULL, "Playback" },
114
115	{ "DAC1", NULL, "VCC" },
116	{ "DAC2", NULL, "VCC" },
117
118	{ "VOUTL", NULL, "DAC1" },
119	{ "VOUTR", NULL, "DAC2" },
120};
121
122static const struct snd_soc_component_driver soc_component_dev_pcm1754 = {
123	.dapm_widgets = pcm1754_dapm_widgets,
124	.num_dapm_widgets = ARRAY_SIZE(pcm1754_dapm_widgets),
125	.dapm_routes = pcm1754_dapm_routes,
126	.num_dapm_routes = ARRAY_SIZE(pcm1754_dapm_routes),
127};
128
129static int pcm1754_probe(struct platform_device *pdev)
130{
131	struct pcm1754_priv *priv;
132	struct device *dev = &pdev->dev;
133	struct snd_soc_dai_driver *dai_drv;
134	int ret;
135
136	dai_drv = devm_kmemdup(dev, &pcm1754_dai, sizeof(*dai_drv), GFP_KERNEL);
137	if (!dai_drv)
138		return -ENOMEM;
139
140	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
141	if (!priv)
142		return -ENOMEM;
143
144	priv->gpiod_mute = devm_gpiod_get_optional(dev, "mute", GPIOD_OUT_HIGH);
145	if (IS_ERR(priv->gpiod_mute))
146		return dev_err_probe(dev, PTR_ERR(priv->gpiod_mute),
147					 "failed to get mute gpio");
148
149	priv->gpiod_format = devm_gpiod_get_optional(dev, "format", GPIOD_OUT_LOW);
150	if (IS_ERR(priv->gpiod_format))
151		return dev_err_probe(dev, PTR_ERR(priv->gpiod_format),
152					 "failed to get format gpio");
153
154	dev_set_drvdata(dev, priv);
155
156	ret = devm_snd_soc_register_component(
157		&pdev->dev, &soc_component_dev_pcm1754, dai_drv, 1);
158	if (ret)
159		return dev_err_probe(dev, ret, "failed to register");
160
161	return 0;
162}
163
164#ifdef CONFIG_OF
165static const struct of_device_id pcm1754_of_match[] = {
166	{ .compatible = "ti,pcm1754" },
167	{ }
168};
169MODULE_DEVICE_TABLE(of, pcm1754_of_match);
170#endif
171
172static struct platform_driver pcm1754_codec_driver = {
173	.driver = {
174		.name = "pcm1754-codec",
175		.of_match_table = of_match_ptr(pcm1754_of_match),
176	},
177	.probe = pcm1754_probe,
178};
179
180module_platform_driver(pcm1754_codec_driver);
181
182MODULE_DESCRIPTION("ASoC PCM1754 driver");
183MODULE_AUTHOR("Alvin Šipraga <alsi@bang-olufsen.dk>");
184MODULE_AUTHOR("Stefan Kerkmann <s.kerkmann@pengutronix.de>");
185MODULE_LICENSE("GPL");