loongson_card.c

  1// SPDX-License-Identifier: GPL-2.0
  2//
  3// Loongson ASoC Audio Machine driver
  4//
  5// Copyright (C) 2023 Loongson Technology Corporation Limited
  6// Author: Yingkun Meng <mengyingkun@loongson.cn>
  7//
  8
  9#include <linux/module.h>
 10#include <sound/soc.h>
 11#include <sound/soc-acpi.h>
 12#include <linux/acpi.h>
 13#include <linux/pci.h>
 14#include <sound/pcm_params.h>
 15
 16static char codec_name[SND_ACPI_I2C_ID_LEN];
 17
 18struct loongson_card_data {
 19	struct snd_soc_card snd_card;
 20	unsigned int mclk_fs;
 21};
 22
 23static int loongson_card_hw_params(struct snd_pcm_substream *substream,
 24				   struct snd_pcm_hw_params *params)
 25{
 26	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
 27	struct loongson_card_data *ls_card = snd_soc_card_get_drvdata(rtd->card);
 28	struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
 29	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
 30	int ret, mclk;
 31
 32	if (!ls_card->mclk_fs)
 33		return 0;
 34
 35	mclk = ls_card->mclk_fs * params_rate(params);
 36	ret = snd_soc_dai_set_sysclk(cpu_dai, 0, mclk, SND_SOC_CLOCK_OUT);
 37	if (ret < 0) {
 38		dev_err(codec_dai->dev, "cpu_dai clock not set\n");
 39		return ret;
 40	}
 41
 42	ret = snd_soc_dai_set_sysclk(codec_dai, 0, mclk, SND_SOC_CLOCK_IN);
 43	if (ret < 0) {
 44		dev_err(codec_dai->dev, "codec_dai clock not set\n");
 45		return ret;
 46	}
 47
 48	return 0;
 49}
 50
 51static const struct snd_soc_ops loongson_ops = {
 52	.hw_params = loongson_card_hw_params,
 53};
 54
 55SND_SOC_DAILINK_DEFS(analog,
 56	DAILINK_COMP_ARRAY(COMP_CPU("loongson-i2s")),
 57	DAILINK_COMP_ARRAY(COMP_EMPTY()),
 58	DAILINK_COMP_ARRAY(COMP_EMPTY()));
 59
 60static struct snd_soc_dai_link loongson_dai_links[] = {
 61	{
 62		.name = "Loongson Audio Port",
 63		.stream_name = "Loongson Audio",
 64		.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_IB_NF
 65			| SND_SOC_DAIFMT_CBC_CFC,
 66		SND_SOC_DAILINK_REG(analog),
 67		.ops = &loongson_ops,
 68	},
 69};
 70
 71static struct acpi_device *loongson_card_acpi_find_device(struct snd_soc_card *card,
 72							  const char *name)
 73{
 74	struct fwnode_handle *fwnode = card->dev->fwnode;
 75	struct fwnode_reference_args args;
 76	int status;
 77
 78	memset(&args, 0, sizeof(args));
 79	status = acpi_node_get_property_reference(fwnode, name, 0, &args);
 80	if (status || !is_acpi_device_node(args.fwnode)) {
 81		dev_err(card->dev, "No matching phy in ACPI table\n");
 82		return NULL;
 83	}
 84
 85	return to_acpi_device_node(args.fwnode);
 86}
 87
 88static int loongson_card_parse_acpi(struct loongson_card_data *data)
 89{
 90	struct snd_soc_card *card = &data->snd_card;
 91	const char *codec_dai_name;
 92	struct acpi_device *adev;
 93	struct device *phy_dev;
 94	int i;
 95
 96	/* fixup platform name based on reference node */
 97	adev = loongson_card_acpi_find_device(card, "cpu");
 98	if (!adev)
 99		return -ENOENT;
100
101	phy_dev = acpi_get_first_physical_node(adev);
102	if (!phy_dev)
103		return -EPROBE_DEFER;
104
105	/* fixup codec name based on reference node */
106	adev = loongson_card_acpi_find_device(card, "codec");
107	if (!adev)
108		return -ENOENT;
109	snprintf(codec_name, sizeof(codec_name), "i2c-%s", acpi_dev_name(adev));
110
111	device_property_read_string(card->dev, "codec-dai-name", &codec_dai_name);
112
113	for (i = 0; i < card->num_links; i++) {
114		loongson_dai_links[i].platforms->name = dev_name(phy_dev);
115		loongson_dai_links[i].codecs->name = codec_name;
116		loongson_dai_links[i].codecs->dai_name = codec_dai_name;
117	}
118
119	return 0;
120}
121
122static int loongson_card_parse_of(struct loongson_card_data *data)
123{
124	struct device_node *cpu, *codec;
125	struct snd_soc_card *card = &data->snd_card;
126	struct device *dev = card->dev;
127	int ret, i;
128
129	cpu = of_get_child_by_name(dev->of_node, "cpu");
130	if (!cpu) {
131		dev_err(dev, "platform property missing or invalid\n");
132		return -EINVAL;
133	}
134	codec = of_get_child_by_name(dev->of_node, "codec");
135	if (!codec) {
136		dev_err(dev, "audio-codec property missing or invalid\n");
137		of_node_put(cpu);
138		return -EINVAL;
139	}
140
141	for (i = 0; i < card->num_links; i++) {
142		ret = snd_soc_of_get_dlc(cpu, NULL, loongson_dai_links[i].cpus, 0);
143		if (ret < 0) {
144			dev_err(dev, "getting cpu dlc error (%d)\n", ret);
145			goto err;
146		}
147		loongson_dai_links[i].platforms->of_node = loongson_dai_links[i].cpus->of_node;
148
149		ret = snd_soc_of_get_dlc(codec, NULL, loongson_dai_links[i].codecs, 0);
150		if (ret < 0) {
151			dev_err(dev, "getting codec dlc error (%d)\n", ret);
152			goto err;
153		}
154	}
155
156	of_node_put(cpu);
157	of_node_put(codec);
158
159	return 0;
160
161err:
162	of_node_put(cpu);
163	of_node_put(codec);
164	return ret;
165}
166
167static int loongson_asoc_card_probe(struct platform_device *pdev)
168{
169	struct loongson_card_data *ls_priv;
170	struct device *dev = &pdev->dev;
171	struct snd_soc_card *card;
172	int ret;
173
174	ls_priv = devm_kzalloc(dev, sizeof(*ls_priv), GFP_KERNEL);
175	if (!ls_priv)
176		return -ENOMEM;
177
178	card = &ls_priv->snd_card;
179
180	card->dev = dev;
181	card->owner = THIS_MODULE;
182	card->dai_link = loongson_dai_links;
183	card->num_links = ARRAY_SIZE(loongson_dai_links);
184	snd_soc_card_set_drvdata(card, ls_priv);
185
186	ret = device_property_read_string(dev, "model", &card->name);
187	if (ret)
188		return dev_err_probe(dev, ret, "Error parsing card name\n");
189
190	ret = device_property_read_u32(dev, "mclk-fs", &ls_priv->mclk_fs);
191	if (ret)
192		return dev_err_probe(dev, ret, "Error parsing mclk-fs\n");
193
194	ret = has_acpi_companion(dev) ? loongson_card_parse_acpi(ls_priv)
195				      : loongson_card_parse_of(ls_priv);
196	if (ret)
197		return dev_err_probe(dev, ret, "Error parsing acpi/of properties\n");
198
199	return devm_snd_soc_register_card(dev, card);
200}
201
202static const struct of_device_id loongson_asoc_dt_ids[] = {
203	{ .compatible = "loongson,ls-audio-card" },
204	{ /* sentinel */ },
205};
206MODULE_DEVICE_TABLE(of, loongson_asoc_dt_ids);
207
208static struct platform_driver loongson_audio_driver = {
209	.probe = loongson_asoc_card_probe,
210	.driver = {
211		.name = "loongson-asoc-card",
212		.pm = &snd_soc_pm_ops,
213		.of_match_table = loongson_asoc_dt_ids,
214	},
215};
216module_platform_driver(loongson_audio_driver);
217
218MODULE_DESCRIPTION("Loongson ASoc Sound Card driver");
219MODULE_AUTHOR("Loongson Technology Corporation Limited");
220MODULE_LICENSE("GPL");