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(card: 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(p: params);
36 ret = snd_soc_dai_set_sysclk(dai: cpu_dai, clk_id: 0, freq: 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(dai: codec_dai, clk_id: 0, freq: 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, index: 0, args: &args);
80 if (status || !is_acpi_device_node(fwnode: 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, name: "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, name: "codec");
107 if (!adev)
108 return -ENOENT;
109 snprintf(buf: codec_name, size: sizeof(codec_name), fmt: "i2c-%s", acpi_dev_name(adev));
110
111 device_property_read_string(dev: card->dev, propname: "codec-dai-name", val: &codec_dai_name);
112
113 for (i = 0; i < card->num_links; i++) {
114 loongson_dai_links[i].platforms->name = dev_name(dev: 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(node: dev->of_node, name: "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(node: dev->of_node, name: "codec");
135 if (!codec) {
136 dev_err(dev, "audio-codec property missing or invalid\n");
137 of_node_put(node: cpu);
138 return -EINVAL;
139 }
140
141 for (i = 0; i < card->num_links; i++) {
142 ret = snd_soc_of_get_dlc(of_node: cpu, NULL, dlc: loongson_dai_links[i].cpus, index: 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(of_node: codec, NULL, dlc: loongson_dai_links[i].codecs, index: 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(node: cpu);
157 of_node_put(node: codec);
158
159 return 0;
160
161err:
162 of_node_put(node: cpu);
163 of_node_put(node: 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, size: 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, data: ls_priv);
185
186 ret = device_property_read_string(dev, propname: "model", val: &card->name);
187 if (ret)
188 return dev_err_probe(dev, err: ret, fmt: "Error parsing card name\n");
189
190 ret = device_property_read_u32(dev, propname: "mclk-fs", val: &ls_priv->mclk_fs);
191 if (ret)
192 return dev_err_probe(dev, err: ret, fmt: "Error parsing mclk-fs\n");
193
194 ret = has_acpi_companion(dev) ? loongson_card_parse_acpi(data: ls_priv)
195 : loongson_card_parse_of(data: ls_priv);
196 if (ret)
197 return dev_err_probe(dev, err: ret, fmt: "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");
221

source code of linux/sound/soc/loongson/loongson_card.c