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Linux/sound/soc/generic/simple-card.c

  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/gpio.h>
 14 #include <linux/module.h>
 15 #include <linux/of.h>
 16 #include <linux/of_gpio.h>
 17 #include <linux/platform_device.h>
 18 #include <linux/string.h>
 19 #include <sound/jack.h>
 20 #include <sound/simple_card.h>
 21 #include <sound/soc-dai.h>
 22 #include <sound/soc.h>
 23 
 24 struct asoc_simple_jack {
 25         struct snd_soc_jack jack;
 26         struct snd_soc_jack_pin pin;
 27         struct snd_soc_jack_gpio gpio;
 28 };
 29 
 30 struct simple_card_data {
 31         struct snd_soc_card snd_card;
 32         struct simple_dai_props {
 33                 struct asoc_simple_dai cpu_dai;
 34                 struct asoc_simple_dai codec_dai;
 35                 unsigned int mclk_fs;
 36         } *dai_props;
 37         unsigned int mclk_fs;
 38         struct asoc_simple_jack hp_jack;
 39         struct asoc_simple_jack mic_jack;
 40         struct snd_soc_dai_link *dai_link;
 41 };
 42 
 43 #define simple_priv_to_dev(priv) ((priv)->snd_card.dev)
 44 #define simple_priv_to_link(priv, i) ((priv)->snd_card.dai_link + (i))
 45 #define simple_priv_to_props(priv, i) ((priv)->dai_props + (i))
 46 
 47 #define DAI     "sound-dai"
 48 #define CELL    "#sound-dai-cells"
 49 #define PREFIX  "simple-audio-card,"
 50 
 51 #define asoc_simple_card_init_hp(card, sjack, prefix)\
 52         asoc_simple_card_init_jack(card, sjack, 1, prefix)
 53 #define asoc_simple_card_init_mic(card, sjack, prefix)\
 54         asoc_simple_card_init_jack(card, sjack, 0, prefix)
 55 static int asoc_simple_card_init_jack(struct snd_soc_card *card,
 56                                       struct asoc_simple_jack *sjack,
 57                                       int is_hp, char *prefix)
 58 {
 59         struct device *dev = card->dev;
 60         enum of_gpio_flags flags;
 61         char prop[128];
 62         char *pin_name;
 63         char *gpio_name;
 64         int mask;
 65         int det;
 66 
 67         sjack->gpio.gpio = -ENOENT;
 68 
 69         if (is_hp) {
 70                 snprintf(prop, sizeof(prop), "%shp-det-gpio", prefix);
 71                 pin_name        = "Headphones";
 72                 gpio_name       = "Headphone detection";
 73                 mask            = SND_JACK_HEADPHONE;
 74         } else {
 75                 snprintf(prop, sizeof(prop), "%smic-det-gpio", prefix);
 76                 pin_name        = "Mic Jack";
 77                 gpio_name       = "Mic detection";
 78                 mask            = SND_JACK_MICROPHONE;
 79         }
 80 
 81         det = of_get_named_gpio_flags(dev->of_node, prop, 0, &flags);
 82         if (det == -EPROBE_DEFER)
 83                 return -EPROBE_DEFER;
 84 
 85         if (gpio_is_valid(det)) {
 86                 sjack->pin.pin          = pin_name;
 87                 sjack->pin.mask         = mask;
 88 
 89                 sjack->gpio.name        = gpio_name;
 90                 sjack->gpio.report      = mask;
 91                 sjack->gpio.gpio        = det;
 92                 sjack->gpio.invert      = !!(flags & OF_GPIO_ACTIVE_LOW);
 93                 sjack->gpio.debounce_time = 150;
 94 
 95                 snd_soc_card_jack_new(card, pin_name, mask,
 96                                       &sjack->jack,
 97                                       &sjack->pin, 1);
 98 
 99                 snd_soc_jack_add_gpios(&sjack->jack, 1,
100                                        &sjack->gpio);
101         }
102 
103         return 0;
104 }
105 
106 static void asoc_simple_card_remove_jack(struct asoc_simple_jack *sjack)
107 {
108         if (gpio_is_valid(sjack->gpio.gpio))
109                 snd_soc_jack_free_gpios(&sjack->jack, 1, &sjack->gpio);
110 }
111 
112 static int asoc_simple_card_startup(struct snd_pcm_substream *substream)
113 {
114         struct snd_soc_pcm_runtime *rtd = substream->private_data;
115         struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
116         struct simple_dai_props *dai_props =
117                 simple_priv_to_props(priv, rtd->num);
118         int ret;
119 
120         ret = clk_prepare_enable(dai_props->cpu_dai.clk);
121         if (ret)
122                 return ret;
123 
124         ret = clk_prepare_enable(dai_props->codec_dai.clk);
125         if (ret)
126                 clk_disable_unprepare(dai_props->cpu_dai.clk);
127 
128         return ret;
129 }
130 
131 static void asoc_simple_card_shutdown(struct snd_pcm_substream *substream)
132 {
133         struct snd_soc_pcm_runtime *rtd = substream->private_data;
134         struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
135         struct simple_dai_props *dai_props =
136                 simple_priv_to_props(priv, rtd->num);
137 
138         clk_disable_unprepare(dai_props->cpu_dai.clk);
139 
140         clk_disable_unprepare(dai_props->codec_dai.clk);
141 }
142 
143 static int asoc_simple_card_hw_params(struct snd_pcm_substream *substream,
144                                       struct snd_pcm_hw_params *params)
145 {
146         struct snd_soc_pcm_runtime *rtd = substream->private_data;
147         struct snd_soc_dai *codec_dai = rtd->codec_dai;
148         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
149         struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
150         struct simple_dai_props *dai_props =
151                 simple_priv_to_props(priv, rtd->num);
152         unsigned int mclk, mclk_fs = 0;
153         int ret = 0;
154 
155         if (priv->mclk_fs)
156                 mclk_fs = priv->mclk_fs;
157         else if (dai_props->mclk_fs)
158                 mclk_fs = dai_props->mclk_fs;
159 
160         if (mclk_fs) {
161                 mclk = params_rate(params) * mclk_fs;
162                 ret = snd_soc_dai_set_sysclk(codec_dai, 0, mclk,
163                                              SND_SOC_CLOCK_IN);
164                 if (ret && ret != -ENOTSUPP)
165                         goto err;
166 
167                 ret = snd_soc_dai_set_sysclk(cpu_dai, 0, mclk,
168                                              SND_SOC_CLOCK_OUT);
169                 if (ret && ret != -ENOTSUPP)
170                         goto err;
171         }
172         return 0;
173 err:
174         return ret;
175 }
176 
177 static const struct snd_soc_ops asoc_simple_card_ops = {
178         .startup = asoc_simple_card_startup,
179         .shutdown = asoc_simple_card_shutdown,
180         .hw_params = asoc_simple_card_hw_params,
181 };
182 
183 static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
184 {
185         struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
186         struct snd_soc_dai *codec = rtd->codec_dai;
187         struct snd_soc_dai *cpu = rtd->cpu_dai;
188         struct simple_dai_props *dai_props =
189                 simple_priv_to_props(priv, rtd->num);
190         int ret;
191 
192         ret = asoc_simple_card_init_dai(codec, &dai_props->codec_dai);
193         if (ret < 0)
194                 return ret;
195 
196         ret = asoc_simple_card_init_dai(cpu, &dai_props->cpu_dai);
197         if (ret < 0)
198                 return ret;
199 
200         ret = asoc_simple_card_init_hp(rtd->card, &priv->hp_jack, PREFIX);
201         if (ret < 0)
202                 return ret;
203 
204         ret = asoc_simple_card_init_mic(rtd->card, &priv->hp_jack, PREFIX);
205         if (ret < 0)
206                 return ret;
207 
208         return 0;
209 }
210 
211 static int asoc_simple_card_dai_link_of(struct device_node *node,
212                                         struct simple_card_data *priv,
213                                         int idx,
214                                         bool is_top_level_node)
215 {
216         struct device *dev = simple_priv_to_dev(priv);
217         struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, idx);
218         struct simple_dai_props *dai_props = simple_priv_to_props(priv, idx);
219         struct asoc_simple_dai *cpu_dai = &dai_props->cpu_dai;
220         struct asoc_simple_dai *codec_dai = &dai_props->codec_dai;
221         struct device_node *cpu = NULL;
222         struct device_node *plat = NULL;
223         struct device_node *codec = NULL;
224         char prop[128];
225         char *prefix = "";
226         int ret, single_cpu;
227 
228         /* For single DAI link & old style of DT node */
229         if (is_top_level_node)
230                 prefix = PREFIX;
231 
232         snprintf(prop, sizeof(prop), "%scpu", prefix);
233         cpu = of_get_child_by_name(node, prop);
234 
235         snprintf(prop, sizeof(prop), "%splat", prefix);
236         plat = of_get_child_by_name(node, prop);
237 
238         snprintf(prop, sizeof(prop), "%scodec", prefix);
239         codec = of_get_child_by_name(node, prop);
240 
241         if (!cpu || !codec) {
242                 ret = -EINVAL;
243                 dev_err(dev, "%s: Can't find %s DT node\n", __func__, prop);
244                 goto dai_link_of_err;
245         }
246 
247         ret = asoc_simple_card_parse_daifmt(dev, node, codec,
248                                             prefix, &dai_link->dai_fmt);
249         if (ret < 0)
250                 goto dai_link_of_err;
251 
252         of_property_read_u32(node, "mclk-fs", &dai_props->mclk_fs);
253 
254         ret = asoc_simple_card_parse_cpu(cpu, dai_link,
255                                          DAI, CELL, &single_cpu);
256         if (ret < 0)
257                 goto dai_link_of_err;
258 
259         ret = asoc_simple_card_parse_codec(codec, dai_link, DAI, CELL);
260         if (ret < 0)
261                 goto dai_link_of_err;
262 
263         ret = asoc_simple_card_parse_platform(plat, dai_link, DAI, CELL);
264         if (ret < 0)
265                 goto dai_link_of_err;
266 
267         ret = snd_soc_of_parse_tdm_slot(cpu,    &cpu_dai->tx_slot_mask,
268                                                 &cpu_dai->rx_slot_mask,
269                                                 &cpu_dai->slots,
270                                                 &cpu_dai->slot_width);
271         if (ret < 0)
272                 goto dai_link_of_err;
273 
274         ret = snd_soc_of_parse_tdm_slot(codec,  &codec_dai->tx_slot_mask,
275                                                 &codec_dai->rx_slot_mask,
276                                                 &codec_dai->slots,
277                                                 &codec_dai->slot_width);
278         if (ret < 0)
279                 goto dai_link_of_err;
280 
281         ret = asoc_simple_card_parse_clk_cpu(cpu, dai_link, cpu_dai);
282         if (ret < 0)
283                 goto dai_link_of_err;
284 
285         ret = asoc_simple_card_parse_clk_codec(codec, dai_link, codec_dai);
286         if (ret < 0)
287                 goto dai_link_of_err;
288 
289         ret = asoc_simple_card_canonicalize_dailink(dai_link);
290         if (ret < 0)
291                 goto dai_link_of_err;
292 
293         ret = asoc_simple_card_set_dailink_name(dev, dai_link,
294                                                 "%s-%s",
295                                                 dai_link->cpu_dai_name,
296                                                 dai_link->codec_dai_name);
297         if (ret < 0)
298                 goto dai_link_of_err;
299 
300         dai_link->ops = &asoc_simple_card_ops;
301         dai_link->init = asoc_simple_card_dai_init;
302 
303         dev_dbg(dev, "\tname : %s\n", dai_link->stream_name);
304         dev_dbg(dev, "\tformat : %04x\n", dai_link->dai_fmt);
305         dev_dbg(dev, "\tcpu : %s / %d\n",
306                 dai_link->cpu_dai_name,
307                 dai_props->cpu_dai.sysclk);
308         dev_dbg(dev, "\tcodec : %s / %d\n",
309                 dai_link->codec_dai_name,
310                 dai_props->codec_dai.sysclk);
311 
312         asoc_simple_card_canonicalize_cpu(dai_link, single_cpu);
313 
314 dai_link_of_err:
315         of_node_put(cpu);
316         of_node_put(codec);
317 
318         return ret;
319 }
320 
321 static int asoc_simple_card_parse_aux_devs(struct device_node *node,
322                                            struct simple_card_data *priv)
323 {
324         struct device *dev = simple_priv_to_dev(priv);
325         struct device_node *aux_node;
326         int i, n, len;
327 
328         if (!of_find_property(node, PREFIX "aux-devs", &len))
329                 return 0;               /* Ok to have no aux-devs */
330 
331         n = len / sizeof(__be32);
332         if (n <= 0)
333                 return -EINVAL;
334 
335         priv->snd_card.aux_dev = devm_kzalloc(dev,
336                         n * sizeof(*priv->snd_card.aux_dev), GFP_KERNEL);
337         if (!priv->snd_card.aux_dev)
338                 return -ENOMEM;
339 
340         for (i = 0; i < n; i++) {
341                 aux_node = of_parse_phandle(node, PREFIX "aux-devs", i);
342                 if (!aux_node)
343                         return -EINVAL;
344                 priv->snd_card.aux_dev[i].codec_of_node = aux_node;
345         }
346 
347         priv->snd_card.num_aux_devs = n;
348         return 0;
349 }
350 
351 static int asoc_simple_card_parse_of(struct device_node *node,
352                                      struct simple_card_data *priv)
353 {
354         struct device *dev = simple_priv_to_dev(priv);
355         struct device_node *dai_link;
356         int ret;
357 
358         if (!node)
359                 return -EINVAL;
360 
361         dai_link = of_get_child_by_name(node, PREFIX "dai-link");
362 
363         /* The off-codec widgets */
364         if (of_property_read_bool(node, PREFIX "widgets")) {
365                 ret = snd_soc_of_parse_audio_simple_widgets(&priv->snd_card,
366                                         PREFIX "widgets");
367                 if (ret)
368                         goto card_parse_end;
369         }
370 
371         /* DAPM routes */
372         if (of_property_read_bool(node, PREFIX "routing")) {
373                 ret = snd_soc_of_parse_audio_routing(&priv->snd_card,
374                                         PREFIX "routing");
375                 if (ret)
376                         goto card_parse_end;
377         }
378 
379         /* Factor to mclk, used in hw_params() */
380         of_property_read_u32(node, PREFIX "mclk-fs", &priv->mclk_fs);
381 
382         /* Single/Muti DAI link(s) & New style of DT node */
383         if (dai_link) {
384                 struct device_node *np = NULL;
385                 int i = 0;
386 
387                 for_each_child_of_node(node, np) {
388                         dev_dbg(dev, "\tlink %d:\n", i);
389                         ret = asoc_simple_card_dai_link_of(np, priv,
390                                                            i, false);
391                         if (ret < 0) {
392                                 of_node_put(np);
393                                 goto card_parse_end;
394                         }
395                         i++;
396                 }
397         } else {
398                 /* For single DAI link & old style of DT node */
399                 ret = asoc_simple_card_dai_link_of(node, priv, 0, true);
400                 if (ret < 0)
401                         goto card_parse_end;
402         }
403 
404         ret = asoc_simple_card_parse_card_name(&priv->snd_card, PREFIX);
405         if (ret < 0)
406                 goto card_parse_end;
407 
408         ret = asoc_simple_card_parse_aux_devs(node, priv);
409 
410 card_parse_end:
411         of_node_put(dai_link);
412 
413         return ret;
414 }
415 
416 static int asoc_simple_card_probe(struct platform_device *pdev)
417 {
418         struct simple_card_data *priv;
419         struct snd_soc_dai_link *dai_link;
420         struct simple_dai_props *dai_props;
421         struct device_node *np = pdev->dev.of_node;
422         struct device *dev = &pdev->dev;
423         int num, ret;
424 
425         /* Get the number of DAI links */
426         if (np && of_get_child_by_name(np, PREFIX "dai-link"))
427                 num = of_get_child_count(np);
428         else
429                 num = 1;
430 
431         /* Allocate the private data and the DAI link array */
432         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
433         if (!priv)
434                 return -ENOMEM;
435 
436         dai_props = devm_kzalloc(dev, sizeof(*dai_props) * num, GFP_KERNEL);
437         dai_link  = devm_kzalloc(dev, sizeof(*dai_link)  * num, GFP_KERNEL);
438         if (!dai_props || !dai_link)
439                 return -ENOMEM;
440 
441         priv->dai_props                 = dai_props;
442         priv->dai_link                  = dai_link;
443 
444         /* Init snd_soc_card */
445         priv->snd_card.owner            = THIS_MODULE;
446         priv->snd_card.dev              = dev;
447         priv->snd_card.dai_link         = priv->dai_link;
448         priv->snd_card.num_links        = num;
449 
450         if (np && of_device_is_available(np)) {
451 
452                 ret = asoc_simple_card_parse_of(np, priv);
453                 if (ret < 0) {
454                         if (ret != -EPROBE_DEFER)
455                                 dev_err(dev, "parse error %d\n", ret);
456                         goto err;
457                 }
458 
459         } else {
460                 struct asoc_simple_card_info *cinfo;
461 
462                 cinfo = dev->platform_data;
463                 if (!cinfo) {
464                         dev_err(dev, "no info for asoc-simple-card\n");
465                         return -EINVAL;
466                 }
467 
468                 if (!cinfo->name ||
469                     !cinfo->codec_dai.name ||
470                     !cinfo->codec ||
471                     !cinfo->platform ||
472                     !cinfo->cpu_dai.name) {
473                         dev_err(dev, "insufficient asoc_simple_card_info settings\n");
474                         return -EINVAL;
475                 }
476 
477                 priv->snd_card.name     = (cinfo->card) ? cinfo->card : cinfo->name;
478                 dai_link->name          = cinfo->name;
479                 dai_link->stream_name   = cinfo->name;
480                 dai_link->platform_name = cinfo->platform;
481                 dai_link->codec_name    = cinfo->codec;
482                 dai_link->cpu_dai_name  = cinfo->cpu_dai.name;
483                 dai_link->codec_dai_name = cinfo->codec_dai.name;
484                 dai_link->dai_fmt       = cinfo->daifmt;
485                 dai_link->init          = asoc_simple_card_dai_init;
486                 memcpy(&priv->dai_props->cpu_dai, &cinfo->cpu_dai,
487                                         sizeof(priv->dai_props->cpu_dai));
488                 memcpy(&priv->dai_props->codec_dai, &cinfo->codec_dai,
489                                         sizeof(priv->dai_props->codec_dai));
490         }
491 
492         snd_soc_card_set_drvdata(&priv->snd_card, priv);
493 
494         ret = devm_snd_soc_register_card(&pdev->dev, &priv->snd_card);
495         if (ret >= 0)
496                 return ret;
497 err:
498         asoc_simple_card_clean_reference(&priv->snd_card);
499 
500         return ret;
501 }
502 
503 static int asoc_simple_card_remove(struct platform_device *pdev)
504 {
505         struct snd_soc_card *card = platform_get_drvdata(pdev);
506         struct simple_card_data *priv = snd_soc_card_get_drvdata(card);
507 
508         asoc_simple_card_remove_jack(&priv->hp_jack);
509         asoc_simple_card_remove_jack(&priv->mic_jack);
510 
511         return asoc_simple_card_clean_reference(card);
512 }
513 
514 static const struct of_device_id asoc_simple_of_match[] = {
515         { .compatible = "simple-audio-card", },
516         {},
517 };
518 MODULE_DEVICE_TABLE(of, asoc_simple_of_match);
519 
520 static struct platform_driver asoc_simple_card = {
521         .driver = {
522                 .name = "asoc-simple-card",
523                 .pm = &snd_soc_pm_ops,
524                 .of_match_table = asoc_simple_of_match,
525         },
526         .probe = asoc_simple_card_probe,
527         .remove = asoc_simple_card_remove,
528 };
529 
530 module_platform_driver(asoc_simple_card);
531 
532 MODULE_ALIAS("platform:asoc-simple-card");
533 MODULE_LICENSE("GPL v2");
534 MODULE_DESCRIPTION("ASoC Simple Sound Card");
535 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
536 

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