1 /*
2  * simple-card-utils.c
3  *
4  * Copyright (c) 2016 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10 #include <linux/clk.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/of_graph.h>
14 #include <sound/simple_card_utils.h>
15 
16 void asoc_simple_card_convert_fixup(struct asoc_simple_card_data *data,
17 				    struct snd_pcm_hw_params *params)
18 {
19 	struct snd_interval *rate = hw_param_interval(params,
20 						SNDRV_PCM_HW_PARAM_RATE);
21 	struct snd_interval *channels = hw_param_interval(params,
22 						SNDRV_PCM_HW_PARAM_CHANNELS);
23 
24 	if (data->convert_rate)
25 		rate->min =
26 		rate->max = data->convert_rate;
27 
28 	if (data->convert_channels)
29 		channels->min =
30 		channels->max = data->convert_channels;
31 }
32 EXPORT_SYMBOL_GPL(asoc_simple_card_convert_fixup);
33 
34 void asoc_simple_card_parse_convert(struct device *dev, char *prefix,
35 				    struct asoc_simple_card_data *data)
36 {
37 	struct device_node *np = dev->of_node;
38 	char prop[128];
39 
40 	if (!prefix)
41 		prefix = "";
42 
43 	/* sampling rate convert */
44 	snprintf(prop, sizeof(prop), "%s%s", prefix, "convert-rate");
45 	of_property_read_u32(np, prop, &data->convert_rate);
46 
47 	/* channels transfer */
48 	snprintf(prop, sizeof(prop), "%s%s", prefix, "convert-channels");
49 	of_property_read_u32(np, prop, &data->convert_channels);
50 
51 	dev_dbg(dev, "convert_rate     %d\n", data->convert_rate);
52 	dev_dbg(dev, "convert_channels %d\n", data->convert_channels);
53 }
54 EXPORT_SYMBOL_GPL(asoc_simple_card_parse_convert);
55 
56 int asoc_simple_card_parse_daifmt(struct device *dev,
57 				  struct device_node *node,
58 				  struct device_node *codec,
59 				  char *prefix,
60 				  unsigned int *retfmt)
61 {
62 	struct device_node *bitclkmaster = NULL;
63 	struct device_node *framemaster = NULL;
64 	unsigned int daifmt;
65 
66 	daifmt = snd_soc_of_parse_daifmt(node, prefix,
67 					 &bitclkmaster, &framemaster);
68 	daifmt &= ~SND_SOC_DAIFMT_MASTER_MASK;
69 
70 	if (!bitclkmaster && !framemaster) {
71 		/*
72 		 * No dai-link level and master setting was not found from
73 		 * sound node level, revert back to legacy DT parsing and
74 		 * take the settings from codec node.
75 		 */
76 		dev_dbg(dev, "Revert to legacy daifmt parsing\n");
77 
78 		daifmt = snd_soc_of_parse_daifmt(codec, NULL, NULL, NULL) |
79 			(daifmt & ~SND_SOC_DAIFMT_CLOCK_MASK);
80 	} else {
81 		if (codec == bitclkmaster)
82 			daifmt |= (codec == framemaster) ?
83 				SND_SOC_DAIFMT_CBM_CFM : SND_SOC_DAIFMT_CBM_CFS;
84 		else
85 			daifmt |= (codec == framemaster) ?
86 				SND_SOC_DAIFMT_CBS_CFM : SND_SOC_DAIFMT_CBS_CFS;
87 	}
88 
89 	of_node_put(bitclkmaster);
90 	of_node_put(framemaster);
91 
92 	*retfmt = daifmt;
93 
94 	dev_dbg(dev, "format : %04x\n", daifmt);
95 
96 	return 0;
97 }
98 EXPORT_SYMBOL_GPL(asoc_simple_card_parse_daifmt);
99 
100 int asoc_simple_card_set_dailink_name(struct device *dev,
101 				      struct snd_soc_dai_link *dai_link,
102 				      const char *fmt, ...)
103 {
104 	va_list ap;
105 	char *name = NULL;
106 	int ret = -ENOMEM;
107 
108 	va_start(ap, fmt);
109 	name = devm_kvasprintf(dev, GFP_KERNEL, fmt, ap);
110 	va_end(ap);
111 
112 	if (name) {
113 		ret = 0;
114 
115 		dai_link->name		= name;
116 		dai_link->stream_name	= name;
117 
118 		dev_dbg(dev, "name : %s\n", name);
119 	}
120 
121 	return ret;
122 }
123 EXPORT_SYMBOL_GPL(asoc_simple_card_set_dailink_name);
124 
125 int asoc_simple_card_parse_card_name(struct snd_soc_card *card,
126 				     char *prefix)
127 {
128 	int ret;
129 
130 	if (!prefix)
131 		prefix = "";
132 
133 	/* Parse the card name from DT */
134 	ret = snd_soc_of_parse_card_name(card, "label");
135 	if (ret < 0) {
136 		char prop[128];
137 
138 		snprintf(prop, sizeof(prop), "%sname", prefix);
139 		ret = snd_soc_of_parse_card_name(card, prop);
140 		if (ret < 0)
141 			return ret;
142 	}
143 
144 	if (!card->name && card->dai_link)
145 		card->name = card->dai_link->name;
146 
147 	dev_dbg(card->dev, "Card Name: %s\n", card->name ? card->name : "");
148 
149 	return 0;
150 }
151 EXPORT_SYMBOL_GPL(asoc_simple_card_parse_card_name);
152 
153 static void asoc_simple_card_clk_register(struct asoc_simple_dai *dai,
154 					  struct clk *clk)
155 {
156 	dai->clk = clk;
157 }
158 
159 int asoc_simple_card_clk_enable(struct asoc_simple_dai *dai)
160 {
161 	return clk_prepare_enable(dai->clk);
162 }
163 EXPORT_SYMBOL_GPL(asoc_simple_card_clk_enable);
164 
165 void asoc_simple_card_clk_disable(struct asoc_simple_dai *dai)
166 {
167 	clk_disable_unprepare(dai->clk);
168 }
169 EXPORT_SYMBOL_GPL(asoc_simple_card_clk_disable);
170 
171 int asoc_simple_card_parse_clk(struct device *dev,
172 			       struct device_node *node,
173 			       struct device_node *dai_of_node,
174 			       struct asoc_simple_dai *simple_dai,
175 			       const char *name)
176 {
177 	struct clk *clk;
178 	u32 val;
179 
180 	/*
181 	 * Parse dai->sysclk come from "clocks = <&xxx>"
182 	 * (if system has common clock)
183 	 *  or "system-clock-frequency = <xxx>"
184 	 *  or device's module clock.
185 	 */
186 	clk = devm_get_clk_from_child(dev, node, NULL);
187 	if (!IS_ERR(clk)) {
188 		simple_dai->sysclk = clk_get_rate(clk);
189 
190 		asoc_simple_card_clk_register(simple_dai, clk);
191 	} else if (!of_property_read_u32(node, "system-clock-frequency", &val)) {
192 		simple_dai->sysclk = val;
193 	} else {
194 		clk = devm_get_clk_from_child(dev, dai_of_node, NULL);
195 		if (!IS_ERR(clk))
196 			simple_dai->sysclk = clk_get_rate(clk);
197 	}
198 
199 	dev_dbg(dev, "%s : sysclk = %d\n", name, simple_dai->sysclk);
200 
201 	return 0;
202 }
203 EXPORT_SYMBOL_GPL(asoc_simple_card_parse_clk);
204 
205 int asoc_simple_card_parse_dai(struct device_node *node,
206 				    struct device_node **dai_of_node,
207 				    const char **dai_name,
208 				    const char *list_name,
209 				    const char *cells_name,
210 				    int *is_single_link)
211 {
212 	struct of_phandle_args args;
213 	int ret;
214 
215 	if (!node)
216 		return 0;
217 
218 	/*
219 	 * Get node via "sound-dai = <&phandle port>"
220 	 * it will be used as xxx_of_node on soc_bind_dai_link()
221 	 */
222 	ret = of_parse_phandle_with_args(node, list_name, cells_name, 0, &args);
223 	if (ret)
224 		return ret;
225 
226 	/* Get dai->name */
227 	if (dai_name) {
228 		ret = snd_soc_of_get_dai_name(node, dai_name);
229 		if (ret < 0)
230 			return ret;
231 	}
232 
233 	*dai_of_node = args.np;
234 
235 	if (is_single_link)
236 		*is_single_link = !args.args_count;
237 
238 	return 0;
239 }
240 EXPORT_SYMBOL_GPL(asoc_simple_card_parse_dai);
241 
242 static int asoc_simple_card_get_dai_id(struct device_node *ep)
243 {
244 	struct device_node *node;
245 	struct device_node *endpoint;
246 	int i, id;
247 	int ret;
248 
249 	ret = snd_soc_get_dai_id(ep);
250 	if (ret != -ENOTSUPP)
251 		return ret;
252 
253 	node = of_graph_get_port_parent(ep);
254 
255 	/*
256 	 * Non HDMI sound case, counting port/endpoint on its DT
257 	 * is enough. Let's count it.
258 	 */
259 	i = 0;
260 	id = -1;
261 	for_each_endpoint_of_node(node, endpoint) {
262 		if (endpoint == ep)
263 			id = i;
264 		i++;
265 	}
266 	if (id < 0)
267 		return -ENODEV;
268 
269 	return id;
270 }
271 
272 int asoc_simple_card_parse_graph_dai(struct device_node *ep,
273 				     struct device_node **dai_of_node,
274 				     const char **dai_name)
275 {
276 	struct device_node *node;
277 	struct of_phandle_args args;
278 	int ret;
279 
280 	if (!ep)
281 		return 0;
282 	if (!dai_name)
283 		return 0;
284 
285 	/*
286 	 * of_graph_get_port_parent() will call
287 	 * of_node_put(). So, call of_node_get() here
288 	 */
289 	of_node_get(ep);
290 	node = of_graph_get_port_parent(ep);
291 
292 	/* Get dai->name */
293 	args.np		= node;
294 	args.args[0]	= asoc_simple_card_get_dai_id(ep);
295 	args.args_count	= (of_graph_get_endpoint_count(node) > 1);
296 
297 	ret = snd_soc_get_dai_name(&args, dai_name);
298 	if (ret < 0)
299 		return ret;
300 
301 	*dai_of_node = node;
302 
303 	return 0;
304 }
305 EXPORT_SYMBOL_GPL(asoc_simple_card_parse_graph_dai);
306 
307 int asoc_simple_card_init_dai(struct snd_soc_dai *dai,
308 			      struct asoc_simple_dai *simple_dai)
309 {
310 	int ret;
311 
312 	if (simple_dai->sysclk) {
313 		ret = snd_soc_dai_set_sysclk(dai, 0, simple_dai->sysclk, 0);
314 		if (ret && ret != -ENOTSUPP) {
315 			dev_err(dai->dev, "simple-card: set_sysclk error\n");
316 			return ret;
317 		}
318 	}
319 
320 	if (simple_dai->slots) {
321 		ret = snd_soc_dai_set_tdm_slot(dai,
322 					       simple_dai->tx_slot_mask,
323 					       simple_dai->rx_slot_mask,
324 					       simple_dai->slots,
325 					       simple_dai->slot_width);
326 		if (ret && ret != -ENOTSUPP) {
327 			dev_err(dai->dev, "simple-card: set_tdm_slot error\n");
328 			return ret;
329 		}
330 	}
331 
332 	return 0;
333 }
334 EXPORT_SYMBOL_GPL(asoc_simple_card_init_dai);
335 
336 int asoc_simple_card_canonicalize_dailink(struct snd_soc_dai_link *dai_link)
337 {
338 	/* Assumes platform == cpu */
339 	if (!dai_link->platform_of_node)
340 		dai_link->platform_of_node = dai_link->cpu_of_node;
341 
342 	return 0;
343 }
344 EXPORT_SYMBOL_GPL(asoc_simple_card_canonicalize_dailink);
345 
346 void asoc_simple_card_canonicalize_cpu(struct snd_soc_dai_link *dai_link,
347 				       int is_single_links)
348 {
349 	/*
350 	 * In soc_bind_dai_link() will check cpu name after
351 	 * of_node matching if dai_link has cpu_dai_name.
352 	 * but, it will never match if name was created by
353 	 * fmt_single_name() remove cpu_dai_name if cpu_args
354 	 * was 0. See:
355 	 *	fmt_single_name()
356 	 *	fmt_multiple_name()
357 	 */
358 	if (is_single_links)
359 		dai_link->cpu_dai_name = NULL;
360 }
361 EXPORT_SYMBOL_GPL(asoc_simple_card_canonicalize_cpu);
362 
363 int asoc_simple_card_clean_reference(struct snd_soc_card *card)
364 {
365 	struct snd_soc_dai_link *dai_link;
366 	int num_links;
367 
368 	for (num_links = 0, dai_link = card->dai_link;
369 	     num_links < card->num_links;
370 	     num_links++, dai_link++) {
371 		of_node_put(dai_link->cpu_of_node);
372 		of_node_put(dai_link->codec_of_node);
373 	}
374 	return 0;
375 }
376 EXPORT_SYMBOL_GPL(asoc_simple_card_clean_reference);
377 
378 int asoc_simple_card_of_parse_routing(struct snd_soc_card *card,
379 				      char *prefix,
380 				      int optional)
381 {
382 	struct device_node *node = card->dev->of_node;
383 	char prop[128];
384 
385 	if (!prefix)
386 		prefix = "";
387 
388 	snprintf(prop, sizeof(prop), "%s%s", prefix, "routing");
389 
390 	if (!of_property_read_bool(node, prop)) {
391 		if (optional)
392 			return 0;
393 		return -EINVAL;
394 	}
395 
396 	return snd_soc_of_parse_audio_routing(card, prop);
397 }
398 EXPORT_SYMBOL_GPL(asoc_simple_card_of_parse_routing);
399 
400 int asoc_simple_card_of_parse_widgets(struct snd_soc_card *card,
401 				      char *prefix)
402 {
403 	struct device_node *node = card->dev->of_node;
404 	char prop[128];
405 
406 	if (!prefix)
407 		prefix = "";
408 
409 	snprintf(prop, sizeof(prop), "%s%s", prefix, "widgets");
410 
411 	if (of_property_read_bool(node, prop))
412 		return snd_soc_of_parse_audio_simple_widgets(card, prop);
413 
414 	/* no widgets is not error */
415 	return 0;
416 }
417 EXPORT_SYMBOL_GPL(asoc_simple_card_of_parse_widgets);
418 
419 /* Module information */
420 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
421 MODULE_DESCRIPTION("ALSA SoC Simple Card Utils");
422 MODULE_LICENSE("GPL v2");
423