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 
12 int 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 }
40 EXPORT_SYMBOL_GPL(meson_card_i2s_set_sysclk);
41 
42 int 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 
66 err_ldata:
67 	kfree(links);
68 err_links:
69 	dev_err(priv->card.dev, "failed to allocate links\n");
70 	return -ENOMEM;
71 
72 }
73 EXPORT_SYMBOL_GPL(meson_card_reallocate_links);
74 
75 int 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 }
95 EXPORT_SYMBOL_GPL(meson_card_parse_dai);
96 
97 static 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 
113 unsigned 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 }
138 EXPORT_SYMBOL_GPL(meson_card_parse_daifmt);
139 
140 int 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 }
179 EXPORT_SYMBOL_GPL(meson_card_set_be_link);
180 
181 int 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 }
209 EXPORT_SYMBOL_GPL(meson_card_set_fe_link);
210 
211 static 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 
242 static 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 
255 static 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 
281 int 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 
338 out_err:
339 	meson_card_clean_references(priv);
340 	return ret;
341 }
342 EXPORT_SYMBOL_GPL(meson_card_probe);
343 
344 int 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 }
352 EXPORT_SYMBOL_GPL(meson_card_remove);
353 
354 MODULE_DESCRIPTION("Amlogic Sound Card Utils");
355 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
356 MODULE_LICENSE("GPL v2");
357