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 
16 static char codec_name[SND_ACPI_I2C_ID_LEN];
17 
18 struct loongson_card_data {
19 	struct snd_soc_card snd_card;
20 	unsigned int mclk_fs;
21 };
22 
23 static 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 = substream->private_data;
27 	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
28 	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
29 	struct loongson_card_data *ls_card = snd_soc_card_get_drvdata(rtd->card);
30 	int ret, mclk;
31 
32 	if (ls_card->mclk_fs) {
33 		mclk = ls_card->mclk_fs * params_rate(params);
34 		ret = snd_soc_dai_set_sysclk(cpu_dai, 0, mclk,
35 					     SND_SOC_CLOCK_OUT);
36 		if (ret < 0) {
37 			dev_err(codec_dai->dev, "cpu_dai clock not set\n");
38 			return ret;
39 		}
40 
41 		ret = snd_soc_dai_set_sysclk(codec_dai, 0, mclk,
42 					     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 
51 static const struct snd_soc_ops loongson_ops = {
52 	.hw_params = loongson_card_hw_params,
53 };
54 
55 SND_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 
60 static 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 
71 static int loongson_card_parse_acpi(struct loongson_card_data *data)
72 {
73 	struct snd_soc_card *card = &data->snd_card;
74 	struct fwnode_handle *fwnode = card->dev->fwnode;
75 	struct fwnode_reference_args args;
76 	const char *codec_dai_name;
77 	struct acpi_device *adev;
78 	struct device *phy_dev;
79 	int ret, i;
80 
81 	/* fixup platform name based on reference node */
82 	memset(&args, 0, sizeof(args));
83 	ret = acpi_node_get_property_reference(fwnode, "cpu", 0, &args);
84 	if (ret || !is_acpi_device_node(args.fwnode)) {
85 		dev_err(card->dev, "No matching phy in ACPI table\n");
86 		return ret ?: -ENOENT;
87 	}
88 	adev = to_acpi_device_node(args.fwnode);
89 	phy_dev = acpi_get_first_physical_node(adev);
90 	if (!phy_dev)
91 		return -EPROBE_DEFER;
92 	for (i = 0; i < card->num_links; i++)
93 		loongson_dai_links[i].platforms->name = dev_name(phy_dev);
94 
95 	/* fixup codec name based on reference node */
96 	memset(&args, 0, sizeof(args));
97 	ret = acpi_node_get_property_reference(fwnode, "codec", 0, &args);
98 	if (ret || !is_acpi_device_node(args.fwnode)) {
99 		dev_err(card->dev, "No matching phy in ACPI table\n");
100 		return ret ?: -ENOENT;
101 	}
102 	adev = to_acpi_device_node(args.fwnode);
103 	snprintf(codec_name, sizeof(codec_name), "i2c-%s", acpi_dev_name(adev));
104 	for (i = 0; i < card->num_links; i++)
105 		loongson_dai_links[i].codecs->name = codec_name;
106 
107 	device_property_read_string(card->dev, "codec-dai-name",
108 				    &codec_dai_name);
109 	for (i = 0; i < card->num_links; i++)
110 		loongson_dai_links[i].codecs->dai_name = codec_dai_name;
111 
112 	return 0;
113 }
114 
115 static int loongson_card_parse_of(struct loongson_card_data *data)
116 {
117 	struct device_node *cpu, *codec;
118 	struct snd_soc_card *card = &data->snd_card;
119 	struct device *dev = card->dev;
120 	int ret, i;
121 
122 	cpu = of_get_child_by_name(dev->of_node, "cpu");
123 	if (!cpu) {
124 		dev_err(dev, "platform property missing or invalid\n");
125 		return -EINVAL;
126 	}
127 	codec = of_get_child_by_name(dev->of_node, "codec");
128 	if (!codec) {
129 		dev_err(dev, "audio-codec property missing or invalid\n");
130 		ret = -EINVAL;
131 		goto err;
132 	}
133 
134 	for (i = 0; i < card->num_links; i++) {
135 		ret = snd_soc_of_get_dlc(cpu, NULL, loongson_dai_links[i].cpus, 0);
136 		if (ret < 0) {
137 			dev_err(dev, "getting cpu dlc error (%d)\n", ret);
138 			goto err;
139 		}
140 
141 		ret = snd_soc_of_get_dlc(codec, NULL, loongson_dai_links[i].codecs, 0);
142 		if (ret < 0) {
143 			dev_err(dev, "getting codec dlc error (%d)\n", ret);
144 			goto err;
145 		}
146 	}
147 
148 	of_node_put(cpu);
149 	of_node_put(codec);
150 
151 	return 0;
152 
153 err:
154 	of_node_put(cpu);
155 	of_node_put(codec);
156 	return ret;
157 }
158 
159 static int loongson_asoc_card_probe(struct platform_device *pdev)
160 {
161 	struct loongson_card_data *ls_priv;
162 	struct snd_soc_card *card;
163 	int ret;
164 
165 	ls_priv = devm_kzalloc(&pdev->dev, sizeof(*ls_priv), GFP_KERNEL);
166 	if (!ls_priv)
167 		return -ENOMEM;
168 
169 	card = &ls_priv->snd_card;
170 
171 	card->dev = &pdev->dev;
172 	card->owner = THIS_MODULE;
173 	card->dai_link = loongson_dai_links;
174 	card->num_links = ARRAY_SIZE(loongson_dai_links);
175 	snd_soc_card_set_drvdata(card, ls_priv);
176 
177 	ret = device_property_read_string(&pdev->dev, "model", &card->name);
178 	if (ret) {
179 		dev_err(&pdev->dev, "Error parsing card name: %d\n", ret);
180 		return ret;
181 	}
182 	ret = device_property_read_u32(&pdev->dev, "mclk-fs", &ls_priv->mclk_fs);
183 	if (ret) {
184 		dev_err(&pdev->dev, "Error parsing mclk-fs: %d\n", ret);
185 		return ret;
186 	}
187 
188 	if (has_acpi_companion(&pdev->dev))
189 		ret = loongson_card_parse_acpi(ls_priv);
190 	else
191 		ret = loongson_card_parse_of(ls_priv);
192 	if (ret < 0)
193 		return ret;
194 
195 	ret = devm_snd_soc_register_card(&pdev->dev, card);
196 
197 	return ret;
198 }
199 
200 static const struct of_device_id loongson_asoc_dt_ids[] = {
201 	{ .compatible = "loongson,ls-audio-card" },
202 	{ /* sentinel */ },
203 };
204 MODULE_DEVICE_TABLE(of, loongson_asoc_dt_ids);
205 
206 static struct platform_driver loongson_audio_driver = {
207 	.probe = loongson_asoc_card_probe,
208 	.driver = {
209 		.name = "loongson-asoc-card",
210 		.pm = &snd_soc_pm_ops,
211 		.of_match_table = loongson_asoc_dt_ids,
212 	},
213 };
214 module_platform_driver(loongson_audio_driver);
215 
216 MODULE_DESCRIPTION("Loongson ASoc Sound Card driver");
217 MODULE_AUTHOR("Loongson Technology Corporation Limited");
218 MODULE_LICENSE("GPL");
219