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 || !card->name) {
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 	if (of_property_read_bool(node, "system-clock-direction-out"))
200 		simple_dai->clk_direction = SND_SOC_CLOCK_OUT;
201 
202 	dev_dbg(dev, "%s : sysclk = %d, direction %d\n", name,
203 		simple_dai->sysclk, simple_dai->clk_direction);
204 
205 	return 0;
206 }
207 EXPORT_SYMBOL_GPL(asoc_simple_card_parse_clk);
208 
209 int asoc_simple_card_parse_dai(struct device_node *node,
210 				    struct device_node **dai_of_node,
211 				    const char **dai_name,
212 				    const char *list_name,
213 				    const char *cells_name,
214 				    int *is_single_link)
215 {
216 	struct of_phandle_args args;
217 	int ret;
218 
219 	if (!node)
220 		return 0;
221 
222 	/*
223 	 * Get node via "sound-dai = <&phandle port>"
224 	 * it will be used as xxx_of_node on soc_bind_dai_link()
225 	 */
226 	ret = of_parse_phandle_with_args(node, list_name, cells_name, 0, &args);
227 	if (ret)
228 		return ret;
229 
230 	/* Get dai->name */
231 	if (dai_name) {
232 		ret = snd_soc_of_get_dai_name(node, dai_name);
233 		if (ret < 0)
234 			return ret;
235 	}
236 
237 	*dai_of_node = args.np;
238 
239 	if (is_single_link)
240 		*is_single_link = !args.args_count;
241 
242 	return 0;
243 }
244 EXPORT_SYMBOL_GPL(asoc_simple_card_parse_dai);
245 
246 static int asoc_simple_card_get_dai_id(struct device_node *ep)
247 {
248 	struct device_node *node;
249 	struct device_node *endpoint;
250 	int i, id;
251 	int ret;
252 
253 	ret = snd_soc_get_dai_id(ep);
254 	if (ret != -ENOTSUPP)
255 		return ret;
256 
257 	node = of_graph_get_port_parent(ep);
258 
259 	/*
260 	 * Non HDMI sound case, counting port/endpoint on its DT
261 	 * is enough. Let's count it.
262 	 */
263 	i = 0;
264 	id = -1;
265 	for_each_endpoint_of_node(node, endpoint) {
266 		if (endpoint == ep)
267 			id = i;
268 		i++;
269 	}
270 
271 	of_node_put(node);
272 
273 	if (id < 0)
274 		return -ENODEV;
275 
276 	return id;
277 }
278 
279 int asoc_simple_card_parse_graph_dai(struct device_node *ep,
280 				     struct device_node **dai_of_node,
281 				     const char **dai_name)
282 {
283 	struct device_node *node;
284 	struct of_phandle_args args;
285 	int ret;
286 
287 	if (!ep)
288 		return 0;
289 	if (!dai_name)
290 		return 0;
291 
292 	node = of_graph_get_port_parent(ep);
293 
294 	/* Get dai->name */
295 	args.np		= node;
296 	args.args[0]	= asoc_simple_card_get_dai_id(ep);
297 	args.args_count	= (of_graph_get_endpoint_count(node) > 1);
298 
299 	ret = snd_soc_get_dai_name(&args, dai_name);
300 	if (ret < 0)
301 		return ret;
302 
303 	*dai_of_node = node;
304 
305 	return 0;
306 }
307 EXPORT_SYMBOL_GPL(asoc_simple_card_parse_graph_dai);
308 
309 int asoc_simple_card_init_dai(struct snd_soc_dai *dai,
310 			      struct asoc_simple_dai *simple_dai)
311 {
312 	int ret;
313 
314 	if (simple_dai->sysclk) {
315 		ret = snd_soc_dai_set_sysclk(dai, 0, simple_dai->sysclk,
316 					     simple_dai->clk_direction);
317 		if (ret && ret != -ENOTSUPP) {
318 			dev_err(dai->dev, "simple-card: set_sysclk error\n");
319 			return ret;
320 		}
321 	}
322 
323 	if (simple_dai->slots) {
324 		ret = snd_soc_dai_set_tdm_slot(dai,
325 					       simple_dai->tx_slot_mask,
326 					       simple_dai->rx_slot_mask,
327 					       simple_dai->slots,
328 					       simple_dai->slot_width);
329 		if (ret && ret != -ENOTSUPP) {
330 			dev_err(dai->dev, "simple-card: set_tdm_slot error\n");
331 			return ret;
332 		}
333 	}
334 
335 	return 0;
336 }
337 EXPORT_SYMBOL_GPL(asoc_simple_card_init_dai);
338 
339 int asoc_simple_card_canonicalize_dailink(struct snd_soc_dai_link *dai_link)
340 {
341 	/* Assumes platform == cpu */
342 	if (!dai_link->platform_of_node)
343 		dai_link->platform_of_node = dai_link->cpu_of_node;
344 
345 	return 0;
346 }
347 EXPORT_SYMBOL_GPL(asoc_simple_card_canonicalize_dailink);
348 
349 void asoc_simple_card_canonicalize_cpu(struct snd_soc_dai_link *dai_link,
350 				       int is_single_links)
351 {
352 	/*
353 	 * In soc_bind_dai_link() will check cpu name after
354 	 * of_node matching if dai_link has cpu_dai_name.
355 	 * but, it will never match if name was created by
356 	 * fmt_single_name() remove cpu_dai_name if cpu_args
357 	 * was 0. See:
358 	 *	fmt_single_name()
359 	 *	fmt_multiple_name()
360 	 */
361 	if (is_single_links)
362 		dai_link->cpu_dai_name = NULL;
363 }
364 EXPORT_SYMBOL_GPL(asoc_simple_card_canonicalize_cpu);
365 
366 int asoc_simple_card_clean_reference(struct snd_soc_card *card)
367 {
368 	struct snd_soc_dai_link *dai_link;
369 	int num_links;
370 
371 	for (num_links = 0, dai_link = card->dai_link;
372 	     num_links < card->num_links;
373 	     num_links++, dai_link++) {
374 		of_node_put(dai_link->cpu_of_node);
375 		of_node_put(dai_link->codec_of_node);
376 	}
377 	return 0;
378 }
379 EXPORT_SYMBOL_GPL(asoc_simple_card_clean_reference);
380 
381 int asoc_simple_card_of_parse_routing(struct snd_soc_card *card,
382 				      char *prefix,
383 				      int optional)
384 {
385 	struct device_node *node = card->dev->of_node;
386 	char prop[128];
387 
388 	if (!prefix)
389 		prefix = "";
390 
391 	snprintf(prop, sizeof(prop), "%s%s", prefix, "routing");
392 
393 	if (!of_property_read_bool(node, prop)) {
394 		if (optional)
395 			return 0;
396 		return -EINVAL;
397 	}
398 
399 	return snd_soc_of_parse_audio_routing(card, prop);
400 }
401 EXPORT_SYMBOL_GPL(asoc_simple_card_of_parse_routing);
402 
403 int asoc_simple_card_of_parse_widgets(struct snd_soc_card *card,
404 				      char *prefix)
405 {
406 	struct device_node *node = card->dev->of_node;
407 	char prop[128];
408 
409 	if (!prefix)
410 		prefix = "";
411 
412 	snprintf(prop, sizeof(prop), "%s%s", prefix, "widgets");
413 
414 	if (of_property_read_bool(node, prop))
415 		return snd_soc_of_parse_audio_simple_widgets(card, prop);
416 
417 	/* no widgets is not error */
418 	return 0;
419 }
420 EXPORT_SYMBOL_GPL(asoc_simple_card_of_parse_widgets);
421 
422 /* Module information */
423 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
424 MODULE_DESCRIPTION("ALSA SoC Simple Card Utils");
425 MODULE_LICENSE("GPL v2");
426