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 snd_soc_dai_link_component *dlc)
78 {
79 	int ret;
80 
81 	if (!dlc || !node)
82 		return -EINVAL;
83 
84 	ret = snd_soc_of_get_dlc(node, NULL, dlc, 0);
85 	if (ret)
86 		return dev_err_probe(card->dev, ret, "can't parse dai\n");
87 
88 	return ret;
89 }
90 EXPORT_SYMBOL_GPL(meson_card_parse_dai);
91 
92 static int meson_card_set_link_name(struct snd_soc_card *card,
93 				    struct snd_soc_dai_link *link,
94 				    struct device_node *node,
95 				    const char *prefix)
96 {
97 	char *name = devm_kasprintf(card->dev, GFP_KERNEL, "%s.%s",
98 				    prefix, node->full_name);
99 	if (!name)
100 		return -ENOMEM;
101 
102 	link->name = name;
103 	link->stream_name = name;
104 
105 	return 0;
106 }
107 
108 unsigned int meson_card_parse_daifmt(struct device_node *node,
109 				     struct device_node *cpu_node)
110 {
111 	struct device_node *bitclkmaster = NULL;
112 	struct device_node *framemaster = NULL;
113 	unsigned int daifmt;
114 
115 	daifmt = snd_soc_daifmt_parse_format(node, NULL);
116 
117 	snd_soc_daifmt_parse_clock_provider_as_phandle(node, NULL, &bitclkmaster, &framemaster);
118 
119 	/* If no master is provided, default to cpu master */
120 	if (!bitclkmaster || bitclkmaster == cpu_node) {
121 		daifmt |= (!framemaster || framemaster == cpu_node) ?
122 			SND_SOC_DAIFMT_CBS_CFS : SND_SOC_DAIFMT_CBS_CFM;
123 	} else {
124 		daifmt |= (!framemaster || framemaster == cpu_node) ?
125 			SND_SOC_DAIFMT_CBM_CFS : SND_SOC_DAIFMT_CBM_CFM;
126 	}
127 
128 	of_node_put(bitclkmaster);
129 	of_node_put(framemaster);
130 
131 	return daifmt;
132 }
133 EXPORT_SYMBOL_GPL(meson_card_parse_daifmt);
134 
135 int meson_card_set_be_link(struct snd_soc_card *card,
136 			   struct snd_soc_dai_link *link,
137 			   struct device_node *node)
138 {
139 	struct snd_soc_dai_link_component *codec;
140 	struct device_node *np;
141 	int ret, num_codecs;
142 
143 	num_codecs = of_get_child_count(node);
144 	if (!num_codecs) {
145 		dev_err(card->dev, "be link %s has no codec\n",
146 			node->full_name);
147 		return -EINVAL;
148 	}
149 
150 	codec = devm_kcalloc(card->dev, num_codecs, sizeof(*codec), GFP_KERNEL);
151 	if (!codec)
152 		return -ENOMEM;
153 
154 	link->codecs = codec;
155 	link->num_codecs = num_codecs;
156 
157 	for_each_child_of_node(node, np) {
158 		ret = meson_card_parse_dai(card, np, codec);
159 		if (ret) {
160 			of_node_put(np);
161 			return ret;
162 		}
163 
164 		codec++;
165 	}
166 
167 	ret = meson_card_set_link_name(card, link, node, "be");
168 	if (ret)
169 		dev_err(card->dev, "error setting %pOFn link name\n", np);
170 
171 	return ret;
172 }
173 EXPORT_SYMBOL_GPL(meson_card_set_be_link);
174 
175 int meson_card_set_fe_link(struct snd_soc_card *card,
176 			   struct snd_soc_dai_link *link,
177 			   struct device_node *node,
178 			   bool is_playback)
179 {
180 	link->codecs = &asoc_dummy_dlc;
181 	link->num_codecs = 1;
182 
183 	link->dynamic = 1;
184 	link->dpcm_merged_format = 1;
185 	link->dpcm_merged_chan = 1;
186 	link->dpcm_merged_rate = 1;
187 
188 	if (is_playback)
189 		link->dpcm_playback = 1;
190 	else
191 		link->dpcm_capture = 1;
192 
193 	return meson_card_set_link_name(card, link, node, "fe");
194 }
195 EXPORT_SYMBOL_GPL(meson_card_set_fe_link);
196 
197 static int meson_card_add_links(struct snd_soc_card *card)
198 {
199 	struct meson_card *priv = snd_soc_card_get_drvdata(card);
200 	struct device_node *node = card->dev->of_node;
201 	struct device_node *np;
202 	int num, i, ret;
203 
204 	num = of_get_child_count(node);
205 	if (!num) {
206 		dev_err(card->dev, "card has no links\n");
207 		return -EINVAL;
208 	}
209 
210 	ret = meson_card_reallocate_links(card, num);
211 	if (ret)
212 		return ret;
213 
214 	i = 0;
215 	for_each_child_of_node(node, np) {
216 		ret = priv->match_data->add_link(card, np, &i);
217 		if (ret) {
218 			of_node_put(np);
219 			return ret;
220 		}
221 
222 		i++;
223 	}
224 
225 	return 0;
226 }
227 
228 static int meson_card_parse_of_optional(struct snd_soc_card *card,
229 					const char *propname,
230 					int (*func)(struct snd_soc_card *c,
231 						    const char *p))
232 {
233 	/* If property is not provided, don't fail ... */
234 	if (!of_property_read_bool(card->dev->of_node, propname))
235 		return 0;
236 
237 	/* ... but do fail if it is provided and the parsing fails */
238 	return func(card, propname);
239 }
240 
241 static void meson_card_clean_references(struct meson_card *priv)
242 {
243 	struct snd_soc_card *card = &priv->card;
244 	struct snd_soc_dai_link *link;
245 	struct snd_soc_dai_link_component *codec;
246 	struct snd_soc_aux_dev *aux;
247 	int i, j;
248 
249 	if (card->dai_link) {
250 		for_each_card_prelinks(card, i, link) {
251 			if (link->cpus)
252 				of_node_put(link->cpus->of_node);
253 			for_each_link_codecs(link, j, codec)
254 				of_node_put(codec->of_node);
255 		}
256 	}
257 
258 	if (card->aux_dev) {
259 		for_each_card_pre_auxs(card, i, aux)
260 			of_node_put(aux->dlc.of_node);
261 	}
262 
263 	kfree(card->dai_link);
264 	kfree(priv->link_data);
265 }
266 
267 int meson_card_probe(struct platform_device *pdev)
268 {
269 	const struct meson_card_match_data *data;
270 	struct device *dev = &pdev->dev;
271 	struct meson_card *priv;
272 	int ret;
273 
274 	data = of_device_get_match_data(dev);
275 	if (!data) {
276 		dev_err(dev, "failed to match device\n");
277 		return -ENODEV;
278 	}
279 
280 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
281 	if (!priv)
282 		return -ENOMEM;
283 
284 	platform_set_drvdata(pdev, priv);
285 	snd_soc_card_set_drvdata(&priv->card, priv);
286 
287 	priv->card.owner = THIS_MODULE;
288 	priv->card.dev = dev;
289 	priv->card.driver_name = dev->driver->name;
290 	priv->match_data = data;
291 
292 	ret = snd_soc_of_parse_card_name(&priv->card, "model");
293 	if (ret < 0)
294 		return ret;
295 
296 	ret = meson_card_parse_of_optional(&priv->card, "audio-routing",
297 					   snd_soc_of_parse_audio_routing);
298 	if (ret) {
299 		dev_err(dev, "error while parsing routing\n");
300 		return ret;
301 	}
302 
303 	ret = meson_card_parse_of_optional(&priv->card, "audio-widgets",
304 					   snd_soc_of_parse_audio_simple_widgets);
305 	if (ret) {
306 		dev_err(dev, "error while parsing widgets\n");
307 		return ret;
308 	}
309 
310 	ret = meson_card_add_links(&priv->card);
311 	if (ret)
312 		goto out_err;
313 
314 	ret = snd_soc_of_parse_aux_devs(&priv->card, "audio-aux-devs");
315 	if (ret)
316 		goto out_err;
317 
318 	ret = devm_snd_soc_register_card(dev, &priv->card);
319 	if (ret)
320 		goto out_err;
321 
322 	return 0;
323 
324 out_err:
325 	meson_card_clean_references(priv);
326 	return ret;
327 }
328 EXPORT_SYMBOL_GPL(meson_card_probe);
329 
330 int meson_card_remove(struct platform_device *pdev)
331 {
332 	struct meson_card *priv = platform_get_drvdata(pdev);
333 
334 	meson_card_clean_references(priv);
335 
336 	return 0;
337 }
338 EXPORT_SYMBOL_GPL(meson_card_remove);
339 
340 MODULE_DESCRIPTION("Amlogic Sound Card Utils");
341 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
342 MODULE_LICENSE("GPL v2");
343