1
2
3
4
5#include <linux/clk.h>
6#include <linux/module.h>
7#include <linux/platform_device.h>
8#include <linux/of.h>
9#include <linux/of_device.h>
10#include <sound/pcm_params.h>
11#include <sound/soc.h>
12
13#include "i2s.h"
14
15#define FIN_PLL_RATE 24000000
16
17SND_SOC_DAILINK_DEFS(links,
18 DAILINK_COMP_ARRAY(COMP_EMPTY()),
19 DAILINK_COMP_ARRAY(COMP_EMPTY()),
20 DAILINK_COMP_ARRAY(COMP_EMPTY()));
21
22struct snow_priv {
23 struct snd_soc_dai_link dai_link;
24 struct clk *clk_i2s_bus;
25};
26
27static int snow_card_hw_params(struct snd_pcm_substream *substream,
28 struct snd_pcm_hw_params *params)
29{
30 static const unsigned int pll_rate[] = {
31 73728000U, 67737602U, 49152000U, 45158401U, 32768001U
32 };
33 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
34 struct snow_priv *priv = snd_soc_card_get_drvdata(rtd->card);
35 int bfs, psr, rfs, bitwidth;
36 unsigned long int rclk;
37 long int freq = -EINVAL;
38 int ret, i;
39
40 bitwidth = snd_pcm_format_width(params_format(params));
41 if (bitwidth < 0) {
42 dev_err(rtd->card->dev, "Invalid bit-width: %d\n", bitwidth);
43 return bitwidth;
44 }
45
46 if (bitwidth != 16 && bitwidth != 24) {
47 dev_err(rtd->card->dev, "Unsupported bit-width: %d\n", bitwidth);
48 return -EINVAL;
49 }
50
51 bfs = 2 * bitwidth;
52
53 switch (params_rate(params)) {
54 case 16000:
55 case 22050:
56 case 24000:
57 case 32000:
58 case 44100:
59 case 48000:
60 case 88200:
61 case 96000:
62 rfs = 8 * bfs;
63 break;
64 case 64000:
65 rfs = 384;
66 break;
67 case 8000:
68 case 11025:
69 case 12000:
70 rfs = 16 * bfs;
71 break;
72 default:
73 return -EINVAL;
74 }
75
76 rclk = params_rate(params) * rfs;
77
78 for (psr = 8; psr > 0; psr /= 2) {
79 for (i = 0; i < ARRAY_SIZE(pll_rate); i++) {
80 if ((pll_rate[i] - rclk * psr) <= 2) {
81 freq = pll_rate[i];
82 break;
83 }
84 }
85 }
86 if (freq < 0) {
87 dev_err(rtd->card->dev, "Unsupported RCLK rate: %lu\n", rclk);
88 return -EINVAL;
89 }
90
91 ret = clk_set_rate(priv->clk_i2s_bus, freq);
92 if (ret < 0) {
93 dev_err(rtd->card->dev, "I2S bus clock rate set failed\n");
94 return ret;
95 }
96
97 return 0;
98}
99
100static const struct snd_soc_ops snow_card_ops = {
101 .hw_params = snow_card_hw_params,
102};
103
104static int snow_late_probe(struct snd_soc_card *card)
105{
106 struct snd_soc_pcm_runtime *rtd;
107 struct snd_soc_dai *codec_dai;
108
109 rtd = snd_soc_get_pcm_runtime(card, &card->dai_link[0]);
110
111
112 codec_dai = asoc_rtd_to_codec(rtd, 0);
113
114
115 return snd_soc_dai_set_sysclk(codec_dai, 0,
116 FIN_PLL_RATE, SND_SOC_CLOCK_IN);
117}
118
119static struct snd_soc_card snow_snd = {
120 .name = "Snow-I2S",
121 .owner = THIS_MODULE,
122 .late_probe = snow_late_probe,
123};
124
125static int snow_probe(struct platform_device *pdev)
126{
127 struct device *dev = &pdev->dev;
128 struct snd_soc_card *card = &snow_snd;
129 struct device_node *cpu, *codec;
130 struct snd_soc_dai_link *link;
131 struct snow_priv *priv;
132 int ret;
133
134 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
135 if (!priv)
136 return -ENOMEM;
137
138 link = &priv->dai_link;
139
140 link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
141 SND_SOC_DAIFMT_CBS_CFS;
142
143 link->name = "Primary";
144 link->stream_name = link->name;
145
146 link->cpus = links_cpus;
147 link->num_cpus = ARRAY_SIZE(links_cpus);
148 link->codecs = links_codecs;
149 link->num_codecs = ARRAY_SIZE(links_codecs);
150 link->platforms = links_platforms;
151 link->num_platforms = ARRAY_SIZE(links_platforms);
152
153 card->dai_link = link;
154 card->num_links = 1;
155 card->dev = dev;
156
157
158 cpu = of_get_child_by_name(dev->of_node, "cpu");
159
160 if (cpu) {
161 link->ops = &snow_card_ops;
162
163 link->cpus->of_node = of_parse_phandle(cpu, "sound-dai", 0);
164 of_node_put(cpu);
165
166 if (!link->cpus->of_node) {
167 dev_err(dev, "Failed parsing cpu/sound-dai property\n");
168 return -EINVAL;
169 }
170
171 codec = of_get_child_by_name(dev->of_node, "codec");
172 ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);
173 of_node_put(codec);
174
175 if (ret < 0) {
176 of_node_put(link->cpus->of_node);
177 dev_err(dev, "Failed parsing codec node\n");
178 return ret;
179 }
180
181 priv->clk_i2s_bus = of_clk_get_by_name(link->cpus->of_node,
182 "i2s_opclk0");
183 if (IS_ERR(priv->clk_i2s_bus)) {
184 snd_soc_of_put_dai_link_codecs(link);
185 of_node_put(link->cpus->of_node);
186 return PTR_ERR(priv->clk_i2s_bus);
187 }
188 } else {
189 link->codecs->dai_name = "HiFi";
190
191 link->cpus->of_node = of_parse_phandle(dev->of_node,
192 "samsung,i2s-controller", 0);
193 if (!link->cpus->of_node) {
194 dev_err(dev, "i2s-controller property parse error\n");
195 return -EINVAL;
196 }
197
198 link->codecs->of_node = of_parse_phandle(dev->of_node,
199 "samsung,audio-codec", 0);
200 if (!link->codecs->of_node) {
201 of_node_put(link->cpus->of_node);
202 dev_err(dev, "audio-codec property parse error\n");
203 return -EINVAL;
204 }
205 }
206
207 link->platforms->of_node = link->cpus->of_node;
208
209
210 snd_soc_of_parse_card_name(card, "samsung,model");
211
212 snd_soc_card_set_drvdata(card, priv);
213
214 ret = devm_snd_soc_register_card(dev, card);
215 if (ret) {
216 if (ret != -EPROBE_DEFER)
217 dev_err(&pdev->dev,
218 "snd_soc_register_card failed (%d)\n", ret);
219 return ret;
220 }
221
222 return ret;
223}
224
225static int snow_remove(struct platform_device *pdev)
226{
227 struct snow_priv *priv = platform_get_drvdata(pdev);
228 struct snd_soc_dai_link *link = &priv->dai_link;
229
230 of_node_put(link->cpus->of_node);
231 of_node_put(link->codecs->of_node);
232 snd_soc_of_put_dai_link_codecs(link);
233
234 clk_put(priv->clk_i2s_bus);
235
236 return 0;
237}
238
239static const struct of_device_id snow_of_match[] = {
240 { .compatible = "google,snow-audio-max98090", },
241 { .compatible = "google,snow-audio-max98091", },
242 { .compatible = "google,snow-audio-max98095", },
243 {},
244};
245MODULE_DEVICE_TABLE(of, snow_of_match);
246
247static struct platform_driver snow_driver = {
248 .driver = {
249 .name = "snow-audio",
250 .pm = &snd_soc_pm_ops,
251 .of_match_table = snow_of_match,
252 },
253 .probe = snow_probe,
254 .remove = snow_remove,
255};
256
257module_platform_driver(snow_driver);
258
259MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow");
260MODULE_LICENSE("GPL");
261
