1// SPDX-License-Identifier: GPL-2.0
  2//
  3// Copyright (c) 2020 BayLibre, SAS.
  4// Author: Jerome Brunet <jbrunet@baylibre.com>
  5
  6#include <linux/module.h>
  7#include <linux/of_platform.h>
  8#include <sound/soc.h>
  9
 10#include "meson-card.h"
 11
 12int meson_card_i2s_set_sysclk(struct snd_pcm_substream *substream,
 13			      struct snd_pcm_hw_params *params,
 14			      unsigned int mclk_fs)
 15{
 16	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 17	struct snd_soc_dai *codec_dai;
 18	unsigned int mclk;
 19	int ret, i;
 20
 21	if (!mclk_fs)
 22		return 0;
 23
 24	mclk = params_rate(params) * mclk_fs;
 25
 26	for_each_rtd_codec_dais(rtd, i, codec_dai) {
 27		ret = snd_soc_dai_set_sysclk(codec_dai, 0, mclk,
 28					     SND_SOC_CLOCK_IN);
 29		if (ret && ret != -ENOTSUPP)
 30			return ret;
 31	}
 32
 33	ret = snd_soc_dai_set_sysclk(asoc_rtd_to_cpu(rtd, 0), 0, mclk,
 34				     SND_SOC_CLOCK_OUT);
 35	if (ret && ret != -ENOTSUPP)
 36		return ret;
 37
 38	return 0;
 39}
 40EXPORT_SYMBOL_GPL(meson_card_i2s_set_sysclk);
 41
 42int meson_card_reallocate_links(struct snd_soc_card *card,
 43				unsigned int num_links)
 44{
 45	struct meson_card *priv = snd_soc_card_get_drvdata(card);
 46	struct snd_soc_dai_link *links;
 47	void **ldata;
 48
 49	links = krealloc(priv->card.dai_link,
 50			 num_links * sizeof(*priv->card.dai_link),
 51			 GFP_KERNEL | __GFP_ZERO);
 52	if (!links)
 53		goto err_links;
 54
 55	ldata = krealloc(priv->link_data,
 56			 num_links * sizeof(*priv->link_data),
 57			 GFP_KERNEL | __GFP_ZERO);
 58	if (!ldata)
 59		goto err_ldata;
 60
 61	priv->card.dai_link = links;
 62	priv->link_data = ldata;
 63	priv->card.num_links = num_links;
 64	return 0;
 65
 66err_ldata:
 67	kfree(links);
 68err_links:
 69	dev_err(priv->card.dev, "failed to allocate links\n");
 70	return -ENOMEM;
 71
 72}
 73EXPORT_SYMBOL_GPL(meson_card_reallocate_links);
 74
 75int meson_card_parse_dai(struct snd_soc_card *card,
 76			 struct device_node *node,
 77			 struct device_node **dai_of_node,
 78			 const char **dai_name)
 79{
 80	struct of_phandle_args args;
 81	int ret;
 82
 83	if (!dai_name || !dai_of_node || !node)
 84		return -EINVAL;
 85
 86	ret = of_parse_phandle_with_args(node, "sound-dai",
 87					 "#sound-dai-cells", 0, &args);
 88	if (ret)
 89		return dev_err_probe(card->dev, ret, "can't parse dai\n");
 90
 91	*dai_of_node = args.np;
 92
 93	return snd_soc_get_dai_name(&args, dai_name);
 94}
 95EXPORT_SYMBOL_GPL(meson_card_parse_dai);
 96
 97static int meson_card_set_link_name(struct snd_soc_card *card,
 98				    struct snd_soc_dai_link *link,
 99				    struct device_node *node,
100				    const char *prefix)
101{
102	char *name = devm_kasprintf(card->dev, GFP_KERNEL, "%s.%s",
103				    prefix, node->full_name);
104	if (!name)
105		return -ENOMEM;
106
107	link->name = name;
108	link->stream_name = name;
109
110	return 0;
111}
112
113unsigned int meson_card_parse_daifmt(struct device_node *node,
114				     struct device_node *cpu_node)
115{
116	struct device_node *bitclkmaster = NULL;
117	struct device_node *framemaster = NULL;
118	unsigned int daifmt;
119
120	daifmt = snd_soc_daifmt_parse_format(node, NULL);
121
122	snd_soc_daifmt_parse_clock_provider_as_phandle(node, NULL, &bitclkmaster, &framemaster);
123
124	/* If no master is provided, default to cpu master */
125	if (!bitclkmaster || bitclkmaster == cpu_node) {
126		daifmt |= (!framemaster || framemaster == cpu_node) ?
127			SND_SOC_DAIFMT_CBS_CFS : SND_SOC_DAIFMT_CBS_CFM;
128	} else {
129		daifmt |= (!framemaster || framemaster == cpu_node) ?
130			SND_SOC_DAIFMT_CBM_CFS : SND_SOC_DAIFMT_CBM_CFM;
131	}
132
133	of_node_put(bitclkmaster);
134	of_node_put(framemaster);
135
136	return daifmt;
137}
138EXPORT_SYMBOL_GPL(meson_card_parse_daifmt);
139
140int meson_card_set_be_link(struct snd_soc_card *card,
141			   struct snd_soc_dai_link *link,
142			   struct device_node *node)
143{
144	struct snd_soc_dai_link_component *codec;
145	struct device_node *np;
146	int ret, num_codecs;
147
148	num_codecs = of_get_child_count(node);
149	if (!num_codecs) {
150		dev_err(card->dev, "be link %s has no codec\n",
151			node->full_name);
152		return -EINVAL;
153	}
154
155	codec = devm_kcalloc(card->dev, num_codecs, sizeof(*codec), GFP_KERNEL);
156	if (!codec)
157		return -ENOMEM;
158
159	link->codecs = codec;
160	link->num_codecs = num_codecs;
161
162	for_each_child_of_node(node, np) {
163		ret = meson_card_parse_dai(card, np, &codec->of_node,
164					   &codec->dai_name);
165		if (ret) {
166			of_node_put(np);
167			return ret;
168		}
169
170		codec++;
171	}
172
173	ret = meson_card_set_link_name(card, link, node, "be");
174	if (ret)
175		dev_err(card->dev, "error setting %pOFn link name\n", np);
176
177	return ret;
178}
179EXPORT_SYMBOL_GPL(meson_card_set_be_link);
180
181int meson_card_set_fe_link(struct snd_soc_card *card,
182			   struct snd_soc_dai_link *link,
183			   struct device_node *node,
184			   bool is_playback)
185{
186	struct snd_soc_dai_link_component *codec;
187
188	codec = devm_kzalloc(card->dev, sizeof(*codec), GFP_KERNEL);
189	if (!codec)
190		return -ENOMEM;
191
192	link->codecs = codec;
193	link->num_codecs = 1;
194
195	link->dynamic = 1;
196	link->dpcm_merged_format = 1;
197	link->dpcm_merged_chan = 1;
198	link->dpcm_merged_rate = 1;
199	link->codecs->dai_name = "snd-soc-dummy-dai";
200	link->codecs->name = "snd-soc-dummy";
201
202	if (is_playback)
203		link->dpcm_playback = 1;
204	else
205		link->dpcm_capture = 1;
206
207	return meson_card_set_link_name(card, link, node, "fe");
208}
209EXPORT_SYMBOL_GPL(meson_card_set_fe_link);
210
211static int meson_card_add_links(struct snd_soc_card *card)
212{
213	struct meson_card *priv = snd_soc_card_get_drvdata(card);
214	struct device_node *node = card->dev->of_node;
215	struct device_node *np;
216	int num, i, ret;
217
218	num = of_get_child_count(node);
219	if (!num) {
220		dev_err(card->dev, "card has no links\n");
221		return -EINVAL;
222	}
223
224	ret = meson_card_reallocate_links(card, num);
225	if (ret)
226		return ret;
227
228	i = 0;
229	for_each_child_of_node(node, np) {
230		ret = priv->match_data->add_link(card, np, &i);
231		if (ret) {
232			of_node_put(np);
233			return ret;
234		}
235
236		i++;
237	}
238
239	return 0;
240}
241
242static int meson_card_parse_of_optional(struct snd_soc_card *card,
243					const char *propname,
244					int (*func)(struct snd_soc_card *c,
245						    const char *p))
246{
247	/* If property is not provided, don't fail ... */
248	if (!of_property_read_bool(card->dev->of_node, propname))
249		return 0;
250
251	/* ... but do fail if it is provided and the parsing fails */
252	return func(card, propname);
253}
254
255static void meson_card_clean_references(struct meson_card *priv)
256{
257	struct snd_soc_card *card = &priv->card;
258	struct snd_soc_dai_link *link;
259	struct snd_soc_dai_link_component *codec;
260	struct snd_soc_aux_dev *aux;
261	int i, j;
262
263	if (card->dai_link) {
264		for_each_card_prelinks(card, i, link) {
265			if (link->cpus)
266				of_node_put(link->cpus->of_node);
267			for_each_link_codecs(link, j, codec)
268				of_node_put(codec->of_node);
269		}
270	}
271
272	if (card->aux_dev) {
273		for_each_card_pre_auxs(card, i, aux)
274			of_node_put(aux->dlc.of_node);
275	}
276
277	kfree(card->dai_link);
278	kfree(priv->link_data);
279}
280
281int meson_card_probe(struct platform_device *pdev)
282{
283	const struct meson_card_match_data *data;
284	struct device *dev = &pdev->dev;
285	struct meson_card *priv;
286	int ret;
287
288	data = of_device_get_match_data(dev);
289	if (!data) {
290		dev_err(dev, "failed to match device\n");
291		return -ENODEV;
292	}
293
294	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
295	if (!priv)
296		return -ENOMEM;
297
298	platform_set_drvdata(pdev, priv);
299	snd_soc_card_set_drvdata(&priv->card, priv);
300
301	priv->card.owner = THIS_MODULE;
302	priv->card.dev = dev;
303	priv->card.driver_name = dev->driver->name;
304	priv->match_data = data;
305
306	ret = snd_soc_of_parse_card_name(&priv->card, "model");
307	if (ret < 0)
308		return ret;
309
310	ret = meson_card_parse_of_optional(&priv->card, "audio-routing",
311					   snd_soc_of_parse_audio_routing);
312	if (ret) {
313		dev_err(dev, "error while parsing routing\n");
314		return ret;
315	}
316
317	ret = meson_card_parse_of_optional(&priv->card, "audio-widgets",
318					   snd_soc_of_parse_audio_simple_widgets);
319	if (ret) {
320		dev_err(dev, "error while parsing widgets\n");
321		return ret;
322	}
323
324	ret = meson_card_add_links(&priv->card);
325	if (ret)
326		goto out_err;
327
328	ret = snd_soc_of_parse_aux_devs(&priv->card, "audio-aux-devs");
329	if (ret)
330		goto out_err;
331
332	ret = devm_snd_soc_register_card(dev, &priv->card);
333	if (ret)
334		goto out_err;
335
336	return 0;
337
338out_err:
339	meson_card_clean_references(priv);
340	return ret;
341}
342EXPORT_SYMBOL_GPL(meson_card_probe);
343
344int meson_card_remove(struct platform_device *pdev)
345{
346	struct meson_card *priv = platform_get_drvdata(pdev);
347
348	meson_card_clean_references(priv);
349
350	return 0;
351}
352EXPORT_SYMBOL_GPL(meson_card_remove);
353
354MODULE_DESCRIPTION("Amlogic Sound Card Utils");
355MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
356MODULE_LICENSE("GPL v2");