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 		if (ret != -EPROBE_DEFER)
90 			dev_err(card->dev, "can't parse dai %d\n", ret);
91 		return ret;
92 	}
93 	*dai_of_node = args.np;
94 
95 	return snd_soc_get_dai_name(&args, dai_name);
96 }
97 EXPORT_SYMBOL_GPL(meson_card_parse_dai);
98 
99 static int meson_card_set_link_name(struct snd_soc_card *card,
100 				    struct snd_soc_dai_link *link,
101 				    struct device_node *node,
102 				    const char *prefix)
103 {
104 	char *name = devm_kasprintf(card->dev, GFP_KERNEL, "%s.%s",
105 				    prefix, node->full_name);
106 	if (!name)
107 		return -ENOMEM;
108 
109 	link->name = name;
110 	link->stream_name = name;
111 
112 	return 0;
113 }
114 
115 unsigned int meson_card_parse_daifmt(struct device_node *node,
116 				     struct device_node *cpu_node)
117 {
118 	struct device_node *bitclkmaster = NULL;
119 	struct device_node *framemaster = NULL;
120 	unsigned int daifmt;
121 
122 	daifmt = snd_soc_daifmt_parse_format(node, NULL);
123 
124 	snd_soc_daifmt_parse_clock_provider_as_phandle(node, NULL, &bitclkmaster, &framemaster);
125 
126 	/* If no master is provided, default to cpu master */
127 	if (!bitclkmaster || bitclkmaster == cpu_node) {
128 		daifmt |= (!framemaster || framemaster == cpu_node) ?
129 			SND_SOC_DAIFMT_CBS_CFS : SND_SOC_DAIFMT_CBS_CFM;
130 	} else {
131 		daifmt |= (!framemaster || framemaster == cpu_node) ?
132 			SND_SOC_DAIFMT_CBM_CFS : SND_SOC_DAIFMT_CBM_CFM;
133 	}
134 
135 	of_node_put(bitclkmaster);
136 	of_node_put(framemaster);
137 
138 	return daifmt;
139 }
140 EXPORT_SYMBOL_GPL(meson_card_parse_daifmt);
141 
142 int meson_card_set_be_link(struct snd_soc_card *card,
143 			   struct snd_soc_dai_link *link,
144 			   struct device_node *node)
145 {
146 	struct snd_soc_dai_link_component *codec;
147 	struct device_node *np;
148 	int ret, num_codecs;
149 
150 	num_codecs = of_get_child_count(node);
151 	if (!num_codecs) {
152 		dev_err(card->dev, "be link %s has no codec\n",
153 			node->full_name);
154 		return -EINVAL;
155 	}
156 
157 	codec = devm_kcalloc(card->dev, num_codecs, sizeof(*codec), GFP_KERNEL);
158 	if (!codec)
159 		return -ENOMEM;
160 
161 	link->codecs = codec;
162 	link->num_codecs = num_codecs;
163 
164 	for_each_child_of_node(node, np) {
165 		ret = meson_card_parse_dai(card, np, &codec->of_node,
166 					   &codec->dai_name);
167 		if (ret) {
168 			of_node_put(np);
169 			return ret;
170 		}
171 
172 		codec++;
173 	}
174 
175 	ret = meson_card_set_link_name(card, link, node, "be");
176 	if (ret)
177 		dev_err(card->dev, "error setting %pOFn link name\n", np);
178 
179 	return ret;
180 }
181 EXPORT_SYMBOL_GPL(meson_card_set_be_link);
182 
183 int meson_card_set_fe_link(struct snd_soc_card *card,
184 			   struct snd_soc_dai_link *link,
185 			   struct device_node *node,
186 			   bool is_playback)
187 {
188 	struct snd_soc_dai_link_component *codec;
189 
190 	codec = devm_kzalloc(card->dev, sizeof(*codec), GFP_KERNEL);
191 	if (!codec)
192 		return -ENOMEM;
193 
194 	link->codecs = codec;
195 	link->num_codecs = 1;
196 
197 	link->dynamic = 1;
198 	link->dpcm_merged_format = 1;
199 	link->dpcm_merged_chan = 1;
200 	link->dpcm_merged_rate = 1;
201 	link->codecs->dai_name = "snd-soc-dummy-dai";
202 	link->codecs->name = "snd-soc-dummy";
203 
204 	if (is_playback)
205 		link->dpcm_playback = 1;
206 	else
207 		link->dpcm_capture = 1;
208 
209 	return meson_card_set_link_name(card, link, node, "fe");
210 }
211 EXPORT_SYMBOL_GPL(meson_card_set_fe_link);
212 
213 static int meson_card_add_links(struct snd_soc_card *card)
214 {
215 	struct meson_card *priv = snd_soc_card_get_drvdata(card);
216 	struct device_node *node = card->dev->of_node;
217 	struct device_node *np;
218 	int num, i, ret;
219 
220 	num = of_get_child_count(node);
221 	if (!num) {
222 		dev_err(card->dev, "card has no links\n");
223 		return -EINVAL;
224 	}
225 
226 	ret = meson_card_reallocate_links(card, num);
227 	if (ret)
228 		return ret;
229 
230 	i = 0;
231 	for_each_child_of_node(node, np) {
232 		ret = priv->match_data->add_link(card, np, &i);
233 		if (ret) {
234 			of_node_put(np);
235 			return ret;
236 		}
237 
238 		i++;
239 	}
240 
241 	return 0;
242 }
243 
244 static int meson_card_parse_of_optional(struct snd_soc_card *card,
245 					const char *propname,
246 					int (*func)(struct snd_soc_card *c,
247 						    const char *p))
248 {
249 	/* If property is not provided, don't fail ... */
250 	if (!of_property_read_bool(card->dev->of_node, propname))
251 		return 0;
252 
253 	/* ... but do fail if it is provided and the parsing fails */
254 	return func(card, propname);
255 }
256 
257 static void meson_card_clean_references(struct meson_card *priv)
258 {
259 	struct snd_soc_card *card = &priv->card;
260 	struct snd_soc_dai_link *link;
261 	struct snd_soc_dai_link_component *codec;
262 	struct snd_soc_aux_dev *aux;
263 	int i, j;
264 
265 	if (card->dai_link) {
266 		for_each_card_prelinks(card, i, link) {
267 			if (link->cpus)
268 				of_node_put(link->cpus->of_node);
269 			for_each_link_codecs(link, j, codec)
270 				of_node_put(codec->of_node);
271 		}
272 	}
273 
274 	if (card->aux_dev) {
275 		for_each_card_pre_auxs(card, i, aux)
276 			of_node_put(aux->dlc.of_node);
277 	}
278 
279 	kfree(card->dai_link);
280 	kfree(priv->link_data);
281 }
282 
283 int meson_card_probe(struct platform_device *pdev)
284 {
285 	const struct meson_card_match_data *data;
286 	struct device *dev = &pdev->dev;
287 	struct meson_card *priv;
288 	int ret;
289 
290 	data = of_device_get_match_data(dev);
291 	if (!data) {
292 		dev_err(dev, "failed to match device\n");
293 		return -ENODEV;
294 	}
295 
296 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
297 	if (!priv)
298 		return -ENOMEM;
299 
300 	platform_set_drvdata(pdev, priv);
301 	snd_soc_card_set_drvdata(&priv->card, priv);
302 
303 	priv->card.owner = THIS_MODULE;
304 	priv->card.dev = dev;
305 	priv->card.driver_name = dev->driver->name;
306 	priv->match_data = data;
307 
308 	ret = snd_soc_of_parse_card_name(&priv->card, "model");
309 	if (ret < 0)
310 		return ret;
311 
312 	ret = meson_card_parse_of_optional(&priv->card, "audio-routing",
313 					   snd_soc_of_parse_audio_routing);
314 	if (ret) {
315 		dev_err(dev, "error while parsing routing\n");
316 		return ret;
317 	}
318 
319 	ret = meson_card_parse_of_optional(&priv->card, "audio-widgets",
320 					   snd_soc_of_parse_audio_simple_widgets);
321 	if (ret) {
322 		dev_err(dev, "error while parsing widgets\n");
323 		return ret;
324 	}
325 
326 	ret = meson_card_add_links(&priv->card);
327 	if (ret)
328 		goto out_err;
329 
330 	ret = snd_soc_of_parse_aux_devs(&priv->card, "audio-aux-devs");
331 	if (ret)
332 		goto out_err;
333 
334 	ret = devm_snd_soc_register_card(dev, &priv->card);
335 	if (ret)
336 		goto out_err;
337 
338 	return 0;
339 
340 out_err:
341 	meson_card_clean_references(priv);
342 	return ret;
343 }
344 EXPORT_SYMBOL_GPL(meson_card_probe);
345 
346 int meson_card_remove(struct platform_device *pdev)
347 {
348 	struct meson_card *priv = platform_get_drvdata(pdev);
349 
350 	meson_card_clean_references(priv);
351 
352 	return 0;
353 }
354 EXPORT_SYMBOL_GPL(meson_card_remove);
355 
356 MODULE_DESCRIPTION("Amlogic Sound Card Utils");
357 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
358 MODULE_LICENSE("GPL v2");
359