audio-graph-scu-card.c 9.8 KB
Newer Older
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
/*
 * ASoC audio graph SCU sound card support
 *
 * Copyright (C) 2017 Renesas Solutions Corp.
 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 *
 * based on
 *	${LINUX}/sound/soc/generic/simple-scu-card.c
 *	${LINUX}/sound/soc/generic/audio-graph-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/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 snd_soc_codec_conf codec_conf;
	struct asoc_simple_dai *dai_props;
	struct snd_soc_dai_link *dai_link;
33
	struct asoc_simple_card_data adata;
34 35 36 37 38 39 40 41 42 43 44 45 46
};

#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 asoc_simple_dai *dai_props = graph_priv_to_props(priv, rtd->num);

47
	return asoc_simple_card_clk_enable(dai_props);
48 49 50 51 52 53 54 55
}

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 asoc_simple_dai *dai_props = graph_priv_to_props(priv, rtd->num);

56
	asoc_simple_card_clk_disable(dai_props);
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
}

static 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 *dai;
	struct snd_soc_dai_link *dai_link;
	struct asoc_simple_dai *dai_props;
	int num = rtd->num;

	dai_link	= graph_priv_to_link(priv, num);
	dai_props	= graph_priv_to_props(priv, num);
	dai		= dai_link->dynamic ?
				rtd->cpu_dai :
				rtd->codec_dai;

	return asoc_simple_card_init_dai(dai, dai_props);
}

static int asoc_graph_card_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
					       struct snd_pcm_hw_params *params)
{
	struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card);

86
	asoc_simple_card_convert_fixup(&priv->adata, params);
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

	return 0;
}

static int asoc_graph_card_dai_link_of(struct device_node *ep,
				       struct graph_card_data *priv,
				       unsigned int daifmt,
				       int idx, int is_fe)
{
	struct device *dev = graph_priv_to_dev(priv);
	struct snd_soc_dai_link *dai_link = graph_priv_to_link(priv, idx);
	struct asoc_simple_dai *dai_props = graph_priv_to_props(priv, idx);
	struct snd_soc_card *card = graph_priv_to_card(priv);
	int ret;

	if (is_fe) {
		/* BE is dummy */
		dai_link->codec_of_node		= NULL;
		dai_link->codec_dai_name	= "snd-soc-dummy-dai";
		dai_link->codec_name		= "snd-soc-dummy";

		/* FE settings */
		dai_link->dynamic		= 1;
		dai_link->dpcm_merged_format	= 1;

		ret = asoc_simple_card_parse_graph_cpu(ep, dai_link);
		if (ret)
			return ret;

		ret = asoc_simple_card_parse_clk_cpu(dev, ep, dai_link, dai_props);
		if (ret < 0)
			return ret;

		ret = asoc_simple_card_set_dailink_name(dev, dai_link,
							"fe.%s",
							dai_link->cpu_dai_name);
		if (ret < 0)
			return ret;

		/* card->num_links includes Codec */
		asoc_simple_card_canonicalize_cpu(dai_link,
					(card->num_links - 1) == 1);
	} else {
		/* FE is dummy */
		dai_link->cpu_of_node		= NULL;
		dai_link->cpu_dai_name		= "snd-soc-dummy-dai";
		dai_link->cpu_name		= "snd-soc-dummy";

		/* BE settings */
		dai_link->no_pcm		= 1;
		dai_link->be_hw_params_fixup	= asoc_graph_card_be_hw_params_fixup;

		ret = asoc_simple_card_parse_graph_codec(ep, dai_link);
		if (ret < 0)
			return ret;

		ret = asoc_simple_card_parse_clk_codec(dev, ep, dai_link, dai_props);
		if (ret < 0)
			return ret;

		ret = asoc_simple_card_set_dailink_name(dev, dai_link,
							"be.%s",
							dai_link->codec_dai_name);
		if (ret < 0)
			return ret;

		snd_soc_of_parse_audio_prefix(card,
					      &priv->codec_conf,
					      dai_link->codec_of_node,
					      "prefix");
	}

159
	ret = asoc_simple_card_of_parse_tdm(ep, dai_props);
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
	if (ret)
		return ret;

	ret = asoc_simple_card_canonicalize_dailink(dai_link);
	if (ret < 0)
		return ret;

	dai_link->dai_fmt		= daifmt;
	dai_link->dpcm_playback		= 1;
	dai_link->dpcm_capture		= 1;
	dai_link->ops			= &asoc_graph_card_ops;
	dai_link->init			= asoc_graph_card_dai_init;

	return 0;
}

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;
	struct device_node *cpu_port;
	struct device_node *cpu_ep;
	struct device_node *codec_ep;
	struct device_node *rcpu_ep;
	unsigned int daifmt = 0;
	int dai_idx, ret;
	int rc, codec;

	if (!node)
		return -EINVAL;

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

	ret = snd_soc_of_parse_audio_routing(card, "routing");
	if (ret)
		return ret;

202
	asoc_simple_card_parse_convert(dev, NULL, &priv->adata);
203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352

	/*
	 * it supports multi CPU, single CODEC only here
	 * see asoc_graph_get_dais_count
	 */

	/* find 1st codec */
	of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
		cpu_port = it.node;
		cpu_ep   = of_get_next_child(cpu_port, NULL);
		codec_ep = of_graph_get_remote_endpoint(cpu_ep);
		rcpu_ep  = of_graph_get_remote_endpoint(codec_ep);

		of_node_put(cpu_port);
		of_node_put(cpu_ep);
		of_node_put(codec_ep);
		of_node_put(rcpu_ep);

		if (!codec_ep)
			continue;

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

		ret = asoc_simple_card_parse_daifmt(dev, cpu_ep, codec_ep,
							    NULL, &daifmt);
		if (ret < 0)
			goto parse_of_err;
	}

	dai_idx = 0;
	for (codec = 0; codec < 2; codec++) {
		/*
		 * To listup valid sounds continuously,
		 * detect all CPU-dummy first, and
		 * detect all dummy-Codec second
		 */
		of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
			cpu_port = it.node;
			cpu_ep   = of_get_next_child(cpu_port, NULL);
			codec_ep = of_graph_get_remote_endpoint(cpu_ep);

			of_node_put(cpu_port);
			of_node_put(cpu_ep);
			of_node_put(codec_ep);

			if (codec) {
				if (!codec_ep)
					continue;

				/* Back-End (= Codec) */
				ret = asoc_graph_card_dai_link_of(codec_ep, priv, daifmt, dai_idx++, 0);
				if (ret < 0)
					goto parse_of_err;
			} else {
				/* Front-End (= CPU) */
				ret = asoc_graph_card_dai_link_of(cpu_ep, priv, daifmt, dai_idx++, 1);
				if (ret < 0)
					goto parse_of_err;
			}
		}
	}

	ret = asoc_simple_card_parse_card_name(card, NULL);
	if (ret)
		goto parse_of_err;

	ret = 0;

parse_of_err:
	return ret;
}

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

	of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
		cpu_port = it.node;
		cpu_ep   = of_get_next_child(cpu_port, NULL);
		codec_ep = of_graph_get_remote_endpoint(cpu_ep);

		of_node_put(cpu_port);
		of_node_put(cpu_ep);
		of_node_put(codec_ep);

		if (cpu_ep)
			count++;
		if (codec_ep)
			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 asoc_simple_dai *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->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		= priv->dai_link;
	card->num_links		= num;
	card->codec_conf	= &priv->codec_conf;
	card->num_configs	= 1;

	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);
353 354 355 356
	if (ret < 0)
		goto err;

	return 0;
357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389
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-scu-card", },
	{},
};
MODULE_DEVICE_TABLE(of, asoc_graph_of_match);

static struct platform_driver asoc_graph_card = {
	.driver = {
		.name = "asoc-audio-graph-scu-card",
		.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-scu-card");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ASoC Audio Graph SCU Sound Card");
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");