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1 | /* | |
2 | * ASoC simple sound card support | |
3 | * | |
4 | * Copyright (C) 2012 Renesas Solutions Corp. | |
5 | * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/clk.h> | |
12 | #include <linux/device.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/of.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/string.h> | |
17 | #include <sound/simple_card.h> | |
18 | #include <sound/soc-dai.h> | |
19 | #include <sound/soc.h> | |
20 | ||
21 | struct simple_card_data { | |
22 | struct snd_soc_card snd_card; | |
23 | struct simple_dai_props { | |
24 | struct asoc_simple_dai cpu_dai; | |
25 | struct asoc_simple_dai codec_dai; | |
26 | } *dai_props; | |
27 | struct snd_soc_dai_link dai_link[]; /* dynamically allocated */ | |
28 | }; | |
29 | ||
30 | static int __asoc_simple_card_dai_init(struct snd_soc_dai *dai, | |
31 | struct asoc_simple_dai *set) | |
32 | { | |
33 | int ret; | |
34 | ||
35 | if (set->fmt) { | |
36 | ret = snd_soc_dai_set_fmt(dai, set->fmt); | |
37 | if (ret && ret != -ENOTSUPP) { | |
38 | dev_err(dai->dev, "simple-card: set_fmt error\n"); | |
39 | goto err; | |
40 | } | |
41 | } | |
42 | ||
43 | if (set->sysclk) { | |
44 | ret = snd_soc_dai_set_sysclk(dai, 0, set->sysclk, 0); | |
45 | if (ret && ret != -ENOTSUPP) { | |
46 | dev_err(dai->dev, "simple-card: set_sysclk error\n"); | |
47 | goto err; | |
48 | } | |
49 | } | |
50 | ||
51 | if (set->slots) { | |
52 | ret = snd_soc_dai_set_tdm_slot(dai, 0, 0, | |
53 | set->slots, | |
54 | set->slot_width); | |
55 | if (ret && ret != -ENOTSUPP) { | |
56 | dev_err(dai->dev, "simple-card: set_tdm_slot error\n"); | |
57 | goto err; | |
58 | } | |
59 | } | |
60 | ||
61 | ret = 0; | |
62 | ||
63 | err: | |
64 | return ret; | |
65 | } | |
66 | ||
67 | static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd) | |
68 | { | |
69 | struct simple_card_data *priv = | |
70 | snd_soc_card_get_drvdata(rtd->card); | |
71 | struct snd_soc_dai *codec = rtd->codec_dai; | |
72 | struct snd_soc_dai *cpu = rtd->cpu_dai; | |
73 | struct simple_dai_props *dai_props; | |
74 | int num, ret; | |
75 | ||
76 | num = rtd - rtd->card->rtd; | |
77 | dai_props = &priv->dai_props[num]; | |
78 | ret = __asoc_simple_card_dai_init(codec, &dai_props->codec_dai); | |
79 | if (ret < 0) | |
80 | return ret; | |
81 | ||
82 | ret = __asoc_simple_card_dai_init(cpu, &dai_props->cpu_dai); | |
83 | if (ret < 0) | |
84 | return ret; | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
89 | static int | |
90 | asoc_simple_card_sub_parse_of(struct device_node *np, | |
91 | unsigned int daifmt, | |
92 | struct asoc_simple_dai *dai, | |
93 | const struct device_node **p_node, | |
94 | const char **name) | |
95 | { | |
96 | struct device_node *node; | |
97 | struct clk *clk; | |
98 | int ret; | |
99 | ||
100 | /* | |
101 | * get node via "sound-dai = <&phandle port>" | |
102 | * it will be used as xxx_of_node on soc_bind_dai_link() | |
103 | */ | |
104 | node = of_parse_phandle(np, "sound-dai", 0); | |
105 | if (!node) | |
106 | return -ENODEV; | |
107 | *p_node = node; | |
108 | ||
109 | /* get dai->name */ | |
110 | ret = snd_soc_of_get_dai_name(np, name); | |
111 | if (ret < 0) | |
112 | return ret; | |
113 | ||
114 | /* parse TDM slot */ | |
115 | ret = snd_soc_of_parse_tdm_slot(np, &dai->slots, &dai->slot_width); | |
116 | if (ret) | |
117 | return ret; | |
118 | ||
119 | /* | |
120 | * bitclock-inversion, frame-inversion | |
121 | * bitclock-master, frame-master | |
122 | * and specific "format" if it has | |
123 | */ | |
124 | dai->fmt = snd_soc_of_parse_daifmt(np, NULL, NULL, NULL); | |
125 | dai->fmt |= daifmt; | |
126 | ||
127 | /* | |
128 | * dai->sysclk come from | |
129 | * "clocks = <&xxx>" (if system has common clock) | |
130 | * or "system-clock-frequency = <xxx>" | |
131 | * or device's module clock. | |
132 | */ | |
133 | if (of_property_read_bool(np, "clocks")) { | |
134 | clk = of_clk_get(np, 0); | |
135 | if (IS_ERR(clk)) { | |
136 | ret = PTR_ERR(clk); | |
137 | return ret; | |
138 | } | |
139 | ||
140 | dai->sysclk = clk_get_rate(clk); | |
141 | } else if (of_property_read_bool(np, "system-clock-frequency")) { | |
142 | of_property_read_u32(np, | |
143 | "system-clock-frequency", | |
144 | &dai->sysclk); | |
145 | } else { | |
146 | clk = of_clk_get(node, 0); | |
147 | if (!IS_ERR(clk)) | |
148 | dai->sysclk = clk_get_rate(clk); | |
149 | } | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | static int simple_card_cpu_codec_of(struct device_node *node, | |
155 | int daifmt, | |
156 | struct snd_soc_dai_link *dai_link, | |
157 | struct simple_dai_props *dai_props) | |
158 | { | |
159 | struct device_node *np; | |
160 | int ret; | |
161 | ||
162 | /* CPU sub-node */ | |
163 | ret = -EINVAL; | |
164 | np = of_get_child_by_name(node, "simple-audio-card,cpu"); | |
165 | if (np) { | |
166 | ret = asoc_simple_card_sub_parse_of(np, daifmt, | |
167 | &dai_props->cpu_dai, | |
168 | &dai_link->cpu_of_node, | |
169 | &dai_link->cpu_dai_name); | |
170 | of_node_put(np); | |
171 | } | |
172 | if (ret < 0) | |
173 | return ret; | |
174 | ||
175 | /* CODEC sub-node */ | |
176 | ret = -EINVAL; | |
177 | np = of_get_child_by_name(node, "simple-audio-card,codec"); | |
178 | if (np) { | |
179 | ret = asoc_simple_card_sub_parse_of(np, daifmt, | |
180 | &dai_props->codec_dai, | |
181 | &dai_link->codec_of_node, | |
182 | &dai_link->codec_dai_name); | |
183 | of_node_put(np); | |
184 | } | |
185 | return ret; | |
186 | } | |
187 | ||
188 | static int asoc_simple_card_parse_of(struct device_node *node, | |
189 | struct simple_card_data *priv, | |
190 | struct device *dev, | |
191 | int multi) | |
192 | { | |
193 | struct snd_soc_dai_link *dai_link = priv->snd_card.dai_link; | |
194 | struct simple_dai_props *dai_props = priv->dai_props; | |
195 | struct device_node *np; | |
196 | char *name; | |
197 | unsigned int daifmt; | |
198 | int ret; | |
199 | ||
200 | /* parsing the card name from DT */ | |
201 | snd_soc_of_parse_card_name(&priv->snd_card, "simple-audio-card,name"); | |
202 | ||
203 | /* get CPU/CODEC common format via simple-audio-card,format */ | |
204 | daifmt = snd_soc_of_parse_daifmt(node, "simple-audio-card,", NULL, | |
205 | NULL) & | |
206 | (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK); | |
207 | ||
208 | /* off-codec widgets */ | |
209 | if (of_property_read_bool(node, "simple-audio-card,widgets")) { | |
210 | ret = snd_soc_of_parse_audio_simple_widgets(&priv->snd_card, | |
211 | "simple-audio-card,widgets"); | |
212 | if (ret) | |
213 | return ret; | |
214 | } | |
215 | ||
216 | /* DAPM routes */ | |
217 | if (of_property_read_bool(node, "simple-audio-card,routing")) { | |
218 | ret = snd_soc_of_parse_audio_routing(&priv->snd_card, | |
219 | "simple-audio-card,routing"); | |
220 | if (ret) | |
221 | return ret; | |
222 | } | |
223 | ||
224 | /* loop on the DAI links */ | |
225 | np = NULL; | |
226 | for (;;) { | |
227 | if (multi) { | |
228 | np = of_get_next_child(node, np); | |
229 | if (!np) | |
230 | break; | |
231 | } | |
232 | ||
233 | ret = simple_card_cpu_codec_of(multi ? np : node, | |
234 | daifmt, dai_link, dai_props); | |
235 | if (ret < 0) | |
236 | goto err; | |
237 | ||
238 | /* | |
239 | * overwrite cpu_dai->fmt as its DAIFMT_MASTER bit is based on CODEC | |
240 | * while the other bits should be identical unless buggy SW/HW design. | |
241 | */ | |
242 | dai_props->cpu_dai.fmt = dai_props->codec_dai.fmt; | |
243 | ||
244 | if (!dai_link->cpu_dai_name || !dai_link->codec_dai_name) { | |
245 | ret = -EINVAL; | |
246 | goto err; | |
247 | } | |
248 | ||
249 | /* simple-card assumes platform == cpu */ | |
250 | dai_link->platform_of_node = dai_link->cpu_of_node; | |
251 | ||
252 | name = devm_kzalloc(dev, | |
253 | strlen(dai_link->cpu_dai_name) + | |
254 | strlen(dai_link->codec_dai_name) + 2, | |
255 | GFP_KERNEL); | |
256 | sprintf(name, "%s-%s", dai_link->cpu_dai_name, | |
257 | dai_link->codec_dai_name); | |
258 | dai_link->name = dai_link->stream_name = name; | |
259 | ||
260 | if (!multi) | |
261 | break; | |
262 | ||
263 | dai_link++; | |
264 | dai_props++; | |
265 | } | |
266 | ||
267 | /* card name is created from CPU/CODEC dai name */ | |
268 | dai_link = priv->snd_card.dai_link; | |
269 | if (!priv->snd_card.name) | |
270 | priv->snd_card.name = dai_link->name; | |
271 | ||
272 | dev_dbg(dev, "card-name : %s\n", priv->snd_card.name); | |
273 | dev_dbg(dev, "platform : %04x\n", daifmt); | |
274 | dai_props = priv->dai_props; | |
275 | dev_dbg(dev, "cpu : %s / %04x / %d\n", | |
276 | dai_link->cpu_dai_name, | |
277 | dai_props->cpu_dai.fmt, | |
278 | dai_props->cpu_dai.sysclk); | |
279 | dev_dbg(dev, "codec : %s / %04x / %d\n", | |
280 | dai_link->codec_dai_name, | |
281 | dai_props->codec_dai.fmt, | |
282 | dai_props->codec_dai.sysclk); | |
283 | ||
284 | return 0; | |
285 | ||
286 | err: | |
287 | of_node_put(np); | |
288 | return ret; | |
289 | } | |
290 | ||
291 | /* update the reference count of the devices nodes at end of probe */ | |
292 | static int asoc_simple_card_unref(struct platform_device *pdev) | |
293 | { | |
294 | struct snd_soc_card *card = platform_get_drvdata(pdev); | |
295 | struct snd_soc_dai_link *dai_link; | |
296 | struct device_node *np; | |
297 | int num_links; | |
298 | ||
299 | for (num_links = 0, dai_link = card->dai_link; | |
300 | num_links < card->num_links; | |
301 | num_links++, dai_link++) { | |
302 | np = (struct device_node *) dai_link->cpu_of_node; | |
303 | if (np) | |
304 | of_node_put(np); | |
305 | np = (struct device_node *) dai_link->codec_of_node; | |
306 | if (np) | |
307 | of_node_put(np); | |
308 | } | |
309 | return 0; | |
310 | } | |
311 | ||
312 | static int asoc_simple_card_probe(struct platform_device *pdev) | |
313 | { | |
314 | struct simple_card_data *priv; | |
315 | struct snd_soc_dai_link *dai_link; | |
316 | struct device_node *np = pdev->dev.of_node; | |
317 | struct device *dev = &pdev->dev; | |
318 | int num_links, multi, ret; | |
319 | ||
320 | /* get the number of DAI links */ | |
321 | if (np && of_get_child_by_name(np, "simple-audio-card,dai-link")) { | |
322 | num_links = of_get_child_count(np); | |
323 | multi = 1; | |
324 | } else { | |
325 | num_links = 1; | |
326 | multi = 0; | |
327 | } | |
328 | ||
329 | /* allocate the private data and the DAI link array */ | |
330 | priv = devm_kzalloc(dev, | |
331 | sizeof(*priv) + sizeof(*dai_link) * num_links, | |
332 | GFP_KERNEL); | |
333 | if (!priv) | |
334 | return -ENOMEM; | |
335 | ||
336 | /* | |
337 | * init snd_soc_card | |
338 | */ | |
339 | priv->snd_card.owner = THIS_MODULE; | |
340 | priv->snd_card.dev = dev; | |
341 | dai_link = priv->dai_link; | |
342 | priv->snd_card.dai_link = dai_link; | |
343 | priv->snd_card.num_links = num_links; | |
344 | ||
345 | /* get room for the other properties */ | |
346 | priv->dai_props = devm_kzalloc(dev, | |
347 | sizeof(*priv->dai_props) * num_links, | |
348 | GFP_KERNEL); | |
349 | if (!priv->dai_props) | |
350 | return -ENOMEM; | |
351 | ||
352 | if (np && of_device_is_available(np)) { | |
353 | ||
354 | ret = asoc_simple_card_parse_of(np, priv, dev, multi); | |
355 | if (ret < 0) { | |
356 | if (ret != -EPROBE_DEFER) | |
357 | dev_err(dev, "parse error %d\n", ret); | |
358 | goto err; | |
359 | } | |
360 | ||
361 | /* | |
362 | * soc_bind_dai_link() will check cpu name | |
363 | * after of_node matching if dai_link has cpu_dai_name. | |
364 | * but, it will never match if name was created by fmt_single_name() | |
365 | * remove cpu_dai_name to escape name matching. | |
366 | * see | |
367 | * fmt_single_name() | |
368 | * fmt_multiple_name() | |
369 | */ | |
370 | if (num_links == 1) | |
371 | dai_link->cpu_dai_name = NULL; | |
372 | ||
373 | } else { | |
374 | struct asoc_simple_card_info *cinfo; | |
375 | ||
376 | cinfo = dev->platform_data; | |
377 | if (!cinfo) { | |
378 | dev_err(dev, "no info for asoc-simple-card\n"); | |
379 | return -EINVAL; | |
380 | } | |
381 | ||
382 | if (!cinfo->name || | |
383 | !cinfo->codec_dai.name || | |
384 | !cinfo->codec || | |
385 | !cinfo->platform || | |
386 | !cinfo->cpu_dai.name) { | |
387 | dev_err(dev, "insufficient asoc_simple_card_info settings\n"); | |
388 | return -EINVAL; | |
389 | } | |
390 | ||
391 | priv->snd_card.name = (cinfo->card) ? cinfo->card : cinfo->name; | |
392 | dai_link->name = cinfo->name; | |
393 | dai_link->stream_name = cinfo->name; | |
394 | dai_link->platform_name = cinfo->platform; | |
395 | dai_link->codec_name = cinfo->codec; | |
396 | dai_link->cpu_dai_name = cinfo->cpu_dai.name; | |
397 | dai_link->codec_dai_name = cinfo->codec_dai.name; | |
398 | memcpy(&priv->dai_props->cpu_dai, &cinfo->cpu_dai, | |
399 | sizeof(priv->dai_props->cpu_dai)); | |
400 | memcpy(&priv->dai_props->codec_dai, &cinfo->codec_dai, | |
401 | sizeof(priv->dai_props->codec_dai)); | |
402 | ||
403 | priv->dai_props->cpu_dai.fmt |= cinfo->daifmt; | |
404 | priv->dai_props->codec_dai.fmt |= cinfo->daifmt; | |
405 | } | |
406 | ||
407 | /* | |
408 | * init snd_soc_dai_link | |
409 | */ | |
410 | dai_link->init = asoc_simple_card_dai_init; | |
411 | ||
412 | snd_soc_card_set_drvdata(&priv->snd_card, priv); | |
413 | ||
414 | ret = devm_snd_soc_register_card(&pdev->dev, &priv->snd_card); | |
415 | ||
416 | err: | |
417 | asoc_simple_card_unref(pdev); | |
418 | return ret; | |
419 | } | |
420 | ||
421 | static const struct of_device_id asoc_simple_of_match[] = { | |
422 | { .compatible = "simple-audio-card", }, | |
423 | {}, | |
424 | }; | |
425 | MODULE_DEVICE_TABLE(of, asoc_simple_of_match); | |
426 | ||
427 | static struct platform_driver asoc_simple_card = { | |
428 | .driver = { | |
429 | .name = "asoc-simple-card", | |
430 | .owner = THIS_MODULE, | |
431 | .of_match_table = asoc_simple_of_match, | |
432 | }, | |
433 | .probe = asoc_simple_card_probe, | |
434 | }; | |
435 | ||
436 | module_platform_driver(asoc_simple_card); | |
437 | ||
438 | MODULE_ALIAS("platform:asoc-simple-card"); | |
439 | MODULE_LICENSE("GPL"); | |
440 | MODULE_DESCRIPTION("ASoC Simple Sound Card"); | |
441 | MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); |