summaryrefslogtreecommitdiff
path: root/sound/soc/samsung/snow.c
blob: 334080e631af06ffeca78d1e26f0bb23e051e41a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
// SPDX-License-Identifier: GPL-2.0
//
// ASoC machine driver for Snow boards

#include <linux/clk.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include "i2s.h"

#define FIN_PLL_RATE		24000000

SND_SOC_DAILINK_DEFS(links,
	DAILINK_COMP_ARRAY(COMP_EMPTY()),
	DAILINK_COMP_ARRAY(COMP_EMPTY()),
	DAILINK_COMP_ARRAY(COMP_EMPTY()));

struct snow_priv {
	struct snd_soc_dai_link dai_link;
	struct clk *clk_i2s_bus;
};

static int snow_card_hw_params(struct snd_pcm_substream *substream,
				      struct snd_pcm_hw_params *params)
{
	static const unsigned int pll_rate[] = {
		73728000U, 67737602U, 49152000U, 45158401U, 32768001U
	};
	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
	struct snow_priv *priv = snd_soc_card_get_drvdata(rtd->card);
	int bfs, psr, rfs, bitwidth;
	unsigned long int rclk;
	long int freq = -EINVAL;
	int ret, i;

	bitwidth = snd_pcm_format_width(params_format(params));
	if (bitwidth < 0) {
		dev_err(rtd->card->dev, "Invalid bit-width: %d\n", bitwidth);
		return bitwidth;
	}

	if (bitwidth != 16 && bitwidth != 24) {
		dev_err(rtd->card->dev, "Unsupported bit-width: %d\n", bitwidth);
		return -EINVAL;
	}

	bfs = 2 * bitwidth;

	switch (params_rate(params)) {
	case 16000:
	case 22050:
	case 24000:
	case 32000:
	case 44100:
	case 48000:
	case 88200:
	case 96000:
		rfs = 8 * bfs;
		break;
	case 64000:
		rfs = 384;
		break;
	case 8000:
	case 11025:
	case 12000:
		rfs = 16 * bfs;
		break;
	default:
		return -EINVAL;
	}

	rclk = params_rate(params) * rfs;

	for (psr = 8; psr > 0; psr /= 2) {
		for (i = 0; i < ARRAY_SIZE(pll_rate); i++) {
			if ((pll_rate[i] - rclk * psr) <= 2) {
				freq = pll_rate[i];
				break;
			}
		}
	}
	if (freq < 0) {
		dev_err(rtd->card->dev, "Unsupported RCLK rate: %lu\n", rclk);
		return -EINVAL;
	}

	ret = clk_set_rate(priv->clk_i2s_bus, freq);
	if (ret < 0) {
		dev_err(rtd->card->dev, "I2S bus clock rate set failed\n");
		return ret;
	}

	return 0;
}

static const struct snd_soc_ops snow_card_ops = {
	.hw_params = snow_card_hw_params,
};

static int snow_late_probe(struct snd_soc_card *card)
{
	struct snd_soc_pcm_runtime *rtd;
	struct snd_soc_dai *codec_dai;

	rtd = snd_soc_get_pcm_runtime(card, &card->dai_link[0]);

	/* In the multi-codec case codec_dais 0 is MAX98095 and 1 is HDMI. */
	codec_dai = asoc_rtd_to_codec(rtd, 0);

	/* Set the MCLK rate for the codec */
	return snd_soc_dai_set_sysclk(codec_dai, 0,
				FIN_PLL_RATE, SND_SOC_CLOCK_IN);
}

static struct snd_soc_card snow_snd = {
	.name = "Snow-I2S",
	.owner = THIS_MODULE,
	.late_probe = snow_late_probe,
};

static int snow_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct snd_soc_card *card = &snow_snd;
	struct device_node *cpu, *codec;
	struct snd_soc_dai_link *link;
	struct snow_priv *priv;
	int ret;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	link = &priv->dai_link;

	link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
			SND_SOC_DAIFMT_CBS_CFS;

	link->name = "Primary";
	link->stream_name = link->name;

	link->cpus = links_cpus;
	link->num_cpus = ARRAY_SIZE(links_cpus);
	link->codecs = links_codecs;
	link->num_codecs = ARRAY_SIZE(links_codecs);
	link->platforms = links_platforms;
	link->num_platforms = ARRAY_SIZE(links_platforms);

	card->dai_link = link;
	card->num_links = 1;
	card->dev = dev;

	/* Try new DT bindings with HDMI support first. */
	cpu = of_get_child_by_name(dev->of_node, "cpu");

	if (cpu) {
		link->ops = &snow_card_ops;

		link->cpus->of_node = of_parse_phandle(cpu, "sound-dai", 0);
		of_node_put(cpu);

		if (!link->cpus->of_node) {
			dev_err(dev, "Failed parsing cpu/sound-dai property\n");
			return -EINVAL;
		}

		codec = of_get_child_by_name(dev->of_node, "codec");
		ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);
		of_node_put(codec);

		if (ret < 0) {
			of_node_put(link->cpus->of_node);
			dev_err(dev, "Failed parsing codec node\n");
			return ret;
		}

		priv->clk_i2s_bus = of_clk_get_by_name(link->cpus->of_node,
						       "i2s_opclk0");
		if (IS_ERR(priv->clk_i2s_bus)) {
			snd_soc_of_put_dai_link_codecs(link);
			of_node_put(link->cpus->of_node);
			return PTR_ERR(priv->clk_i2s_bus);
		}
	} else {
		link->codecs->dai_name = "HiFi";

		link->cpus->of_node = of_parse_phandle(dev->of_node,
						"samsung,i2s-controller", 0);
		if (!link->cpus->of_node) {
			dev_err(dev, "i2s-controller property parse error\n");
			return -EINVAL;
		}

		link->codecs->of_node = of_parse_phandle(dev->of_node,
						"samsung,audio-codec", 0);
		if (!link->codecs->of_node) {
			of_node_put(link->cpus->of_node);
			dev_err(dev, "audio-codec property parse error\n");
			return -EINVAL;
		}
	}

	link->platforms->of_node = link->cpus->of_node;

	/* Update card-name if provided through DT, else use default name */
	snd_soc_of_parse_card_name(card, "samsung,model");

	snd_soc_card_set_drvdata(card, priv);

	ret = devm_snd_soc_register_card(dev, card);
	if (ret)
		return dev_err_probe(&pdev->dev, ret,
				     "snd_soc_register_card failed\n");

	return 0;
}

static void snow_remove(struct platform_device *pdev)
{
	struct snow_priv *priv = platform_get_drvdata(pdev);
	struct snd_soc_dai_link *link = &priv->dai_link;

	of_node_put(link->cpus->of_node);
	of_node_put(link->codecs->of_node);
	snd_soc_of_put_dai_link_codecs(link);

	clk_put(priv->clk_i2s_bus);
}

static const struct of_device_id snow_of_match[] = {
	{ .compatible = "google,snow-audio-max98090", },
	{ .compatible = "google,snow-audio-max98091", },
	{ .compatible = "google,snow-audio-max98095", },
	{},
};
MODULE_DEVICE_TABLE(of, snow_of_match);

static struct platform_driver snow_driver = {
	.driver = {
		.name = "snow-audio",
		.pm = &snd_soc_pm_ops,
		.of_match_table = snow_of_match,
	},
	.probe = snow_probe,
	.remove_new = snow_remove,
};

module_platform_driver(snow_driver);

MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow");
MODULE_LICENSE("GPL");