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 = snd_soc_substream_to_rtd(substream);
27 struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
28 struct snd_soc_dai *codec_dai = snd_soc_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 of_node_put(cpu);
131 return -EINVAL;
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
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