summaryrefslogtreecommitdiffstats
path: root/sound/soc/generic/audio-graph-card.c
blob: 488c52f9405fcd2fb7ec909d7fdda4bbf8b36e81 (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
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
/*
 * ASoC audio graph sound card support
 *
 * Copyright (C) 2016 Renesas Solutions Corp.
 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 *
 * based on ${LINUX}/sound/soc/generic/simple-card.c
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <sound/jack.h>
#include <sound/simple_card_utils.h>

struct graph_card_data {
	struct snd_soc_card snd_card;
	struct graph_dai_props {
		struct asoc_simple_dai cpu_dai;
		struct asoc_simple_dai codec_dai;
	} *dai_props;
	struct snd_soc_dai_link *dai_link;
	struct gpio_desc *pa_gpio;
};

static int asoc_graph_card_outdrv_event(struct snd_soc_dapm_widget *w,
					struct snd_kcontrol *kcontrol,
					int event)
{
	struct snd_soc_dapm_context *dapm = w->dapm;
	struct graph_card_data *priv = snd_soc_card_get_drvdata(dapm->card);

	switch (event) {
	case SND_SOC_DAPM_POST_PMU:
		gpiod_set_value_cansleep(priv->pa_gpio, 1);
		break;
	case SND_SOC_DAPM_PRE_PMD:
		gpiod_set_value_cansleep(priv->pa_gpio, 0);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static const struct snd_soc_dapm_widget asoc_graph_card_dapm_widgets[] = {
	SND_SOC_DAPM_OUT_DRV_E("Amplifier", SND_SOC_NOPM,
			       0, 0, NULL, 0, asoc_graph_card_outdrv_event,
			       SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
};

#define graph_priv_to_card(priv) (&(priv)->snd_card)
#define graph_priv_to_props(priv, i) ((priv)->dai_props + (i))
#define graph_priv_to_dev(priv) (graph_priv_to_card(priv)->dev)
#define graph_priv_to_link(priv, i) (graph_priv_to_card(priv)->dai_link + (i))

static int asoc_graph_card_startup(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
	struct graph_dai_props *dai_props = graph_priv_to_props(priv, rtd->num);
	int ret;

	ret = asoc_simple_card_clk_enable(&dai_props->cpu_dai);
	if (ret)
		return ret;

	ret = asoc_simple_card_clk_enable(&dai_props->codec_dai);
	if (ret)
		asoc_simple_card_clk_disable(&dai_props->cpu_dai);

	return ret;
}

static void asoc_graph_card_shutdown(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
	struct graph_dai_props *dai_props = graph_priv_to_props(priv, rtd->num);

	asoc_simple_card_clk_disable(&dai_props->cpu_dai);

	asoc_simple_card_clk_disable(&dai_props->codec_dai);
}

static const struct snd_soc_ops asoc_graph_card_ops = {
	.startup = asoc_graph_card_startup,
	.shutdown = asoc_graph_card_shutdown,
};

static int asoc_graph_card_dai_init(struct snd_soc_pcm_runtime *rtd)
{
	struct graph_card_data *priv =	snd_soc_card_get_drvdata(rtd->card);
	struct snd_soc_dai *codec = rtd->codec_dai;
	struct snd_soc_dai *cpu = rtd->cpu_dai;
	struct graph_dai_props *dai_props =
		graph_priv_to_props(priv, rtd->num);
	int ret;

	ret = asoc_simple_card_init_dai(codec, &dai_props->codec_dai);
	if (ret < 0)
		return ret;

	ret = asoc_simple_card_init_dai(cpu, &dai_props->cpu_dai);
	if (ret < 0)
		return ret;

	return 0;
}

static int asoc_graph_card_dai_link_of(struct device_node *cpu_port,
					struct graph_card_data *priv,
					int idx)
{
	struct device *dev = graph_priv_to_dev(priv);
	struct snd_soc_dai_link *dai_link = graph_priv_to_link(priv, idx);
	struct graph_dai_props *dai_props = graph_priv_to_props(priv, idx);
	struct asoc_simple_dai *cpu_dai = &dai_props->cpu_dai;
	struct asoc_simple_dai *codec_dai = &dai_props->codec_dai;
	struct device_node *cpu_ep    = of_get_next_child(cpu_port, NULL);
	struct device_node *codec_ep = of_graph_get_remote_endpoint(cpu_ep);
	struct device_node *rcpu_ep = of_graph_get_remote_endpoint(codec_ep);
	int ret;

	if (rcpu_ep != cpu_ep) {
		dev_err(dev, "remote-endpoint mismatch (%s/%s/%s)\n",
			cpu_ep->name, codec_ep->name, rcpu_ep->name);
		ret = -EINVAL;
		goto dai_link_of_err;
	}

	ret = asoc_simple_card_parse_daifmt(dev, cpu_ep, codec_ep,
					    NULL, &dai_link->dai_fmt);
	if (ret < 0)
		goto dai_link_of_err;

	/*
	 * we need to consider "mclk-fs" around here
	 * see simple-card
	 */

	ret = asoc_simple_card_parse_graph_cpu(cpu_ep, dai_link);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_parse_graph_codec(codec_ep, dai_link);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_of_parse_tdm(cpu_ep, cpu_dai);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_of_parse_tdm(codec_ep, codec_dai);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_parse_clk_cpu(dev, cpu_ep, dai_link, cpu_dai);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_parse_clk_codec(dev, codec_ep, dai_link, codec_dai);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_canonicalize_dailink(dai_link);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_set_dailink_name(dev, dai_link,
						"%s-%s",
						dai_link->cpu_dai_name,
						dai_link->codec_dai_name);
	if (ret < 0)
		goto dai_link_of_err;

	dai_link->ops = &asoc_graph_card_ops;
	dai_link->init = asoc_graph_card_dai_init;

	asoc_simple_card_canonicalize_cpu(dai_link,
		of_graph_get_endpoint_count(dai_link->cpu_of_node) == 1);

dai_link_of_err:
	of_node_put(cpu_ep);
	of_node_put(rcpu_ep);
	of_node_put(codec_ep);

	return ret;
}

static int asoc_graph_card_parse_of(struct graph_card_data *priv)
{
	struct of_phandle_iterator it;
	struct device *dev = graph_priv_to_dev(priv);
	struct snd_soc_card *card = graph_priv_to_card(priv);
	struct device_node *node = dev->of_node;
	int rc, idx = 0;
	int ret;

	ret = asoc_simple_card_of_parse_widgets(card, NULL);
	if (ret < 0)
		return ret;

	ret = asoc_simple_card_of_parse_routing(card, NULL, 1);
	if (ret < 0)
		return ret;

	/*
	 * we need to consider "mclk-fs" around here
	 * see simple-card
	 */

	of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
		ret = asoc_graph_card_dai_link_of(it.node, priv, idx++);
		if (ret < 0) {
			of_node_put(it.node);

			return ret;
		}
	}

	return asoc_simple_card_parse_card_name(card, NULL);
}

static int asoc_graph_get_dais_count(struct device *dev)
{
	struct of_phandle_iterator it;
	struct device_node *node = dev->of_node;
	int count = 0;
	int rc;

	of_for_each_phandle(&it, rc, node, "dais", NULL, 0)
		count++;

	return count;
}

static int asoc_graph_card_probe(struct platform_device *pdev)
{
	struct graph_card_data *priv;
	struct snd_soc_dai_link *dai_link;
	struct graph_dai_props *dai_props;
	struct device *dev = &pdev->dev;
	struct snd_soc_card *card;
	int num, ret;

	/* Allocate the private data and the DAI link array */
	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	num = asoc_graph_get_dais_count(dev);
	if (num == 0)
		return -EINVAL;

	dai_props = devm_kzalloc(dev, sizeof(*dai_props) * num, GFP_KERNEL);
	dai_link  = devm_kzalloc(dev, sizeof(*dai_link)  * num, GFP_KERNEL);
	if (!dai_props || !dai_link)
		return -ENOMEM;

	priv->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW);
	if (IS_ERR(priv->pa_gpio)) {
		ret = PTR_ERR(priv->pa_gpio);
		dev_err(dev, "failed to get amplifier gpio: %d\n", ret);
		return ret;
	}

	priv->dai_props			= dai_props;
	priv->dai_link			= dai_link;

	/* Init snd_soc_card */
	card = graph_priv_to_card(priv);
	card->owner	= THIS_MODULE;
	card->dev	= dev;
	card->dai_link	= dai_link;
	card->num_links	= num;
	card->dapm_widgets = asoc_graph_card_dapm_widgets;
	card->num_dapm_widgets = ARRAY_SIZE(asoc_graph_card_dapm_widgets);

	ret = asoc_graph_card_parse_of(priv);
	if (ret < 0) {
		if (ret != -EPROBE_DEFER)
			dev_err(dev, "parse error %d\n", ret);
		goto err;
	}

	snd_soc_card_set_drvdata(card, priv);

	ret = devm_snd_soc_register_card(dev, card);
	if (ret < 0)
		goto err;

	return 0;
err:
	asoc_simple_card_clean_reference(card);

	return ret;
}

static int asoc_graph_card_remove(struct platform_device *pdev)
{
	struct snd_soc_card *card = platform_get_drvdata(pdev);

	return asoc_simple_card_clean_reference(card);
}

static const struct of_device_id asoc_graph_of_match[] = {
	{ .compatible = "audio-graph-card", },
	{},
};
MODULE_DEVICE_TABLE(of, asoc_graph_of_match);

static struct platform_driver asoc_graph_card = {
	.driver = {
		.name = "asoc-audio-graph-card",
		.pm = &snd_soc_pm_ops,
		.of_match_table = asoc_graph_of_match,
	},
	.probe = asoc_graph_card_probe,
	.remove = asoc_graph_card_remove,
};
module_platform_driver(asoc_graph_card);

MODULE_ALIAS("platform:asoc-audio-graph-card");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ASoC Audio Graph Sound Card");
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");