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Linux/sound/soc/generic/audio-graph-card.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 //
  3 // ASoC audio graph sound card support
  4 //
  5 // Copyright (C) 2016 Renesas Solutions Corp.
  6 // Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
  7 //
  8 // based on ${LINUX}/sound/soc/generic/simple-card.c
  9 
 10 #include <linux/clk.h>
 11 #include <linux/device.h>
 12 #include <linux/gpio.h>
 13 #include <linux/gpio/consumer.h>
 14 #include <linux/module.h>
 15 #include <linux/of.h>
 16 #include <linux/of_device.h>
 17 #include <linux/of_gpio.h>
 18 #include <linux/of_graph.h>
 19 #include <linux/platform_device.h>
 20 #include <linux/string.h>
 21 #include <sound/simple_card_utils.h>
 22 
 23 #define DPCM_SELECTABLE 1
 24 
 25 #define PREFIX  "audio-graph-card,"
 26 
 27 static int graph_outdrv_event(struct snd_soc_dapm_widget *w,
 28                               struct snd_kcontrol *kcontrol,
 29                               int event)
 30 {
 31         struct snd_soc_dapm_context *dapm = w->dapm;
 32         struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(dapm->card);
 33 
 34         switch (event) {
 35         case SND_SOC_DAPM_POST_PMU:
 36                 gpiod_set_value_cansleep(priv->pa_gpio, 1);
 37                 break;
 38         case SND_SOC_DAPM_PRE_PMD:
 39                 gpiod_set_value_cansleep(priv->pa_gpio, 0);
 40                 break;
 41         default:
 42                 return -EINVAL;
 43         }
 44 
 45         return 0;
 46 }
 47 
 48 static const struct snd_soc_dapm_widget graph_dapm_widgets[] = {
 49         SND_SOC_DAPM_OUT_DRV_E("Amplifier", SND_SOC_NOPM,
 50                                0, 0, NULL, 0, graph_outdrv_event,
 51                                SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
 52 };
 53 
 54 static const struct snd_soc_ops graph_ops = {
 55         .startup        = asoc_simple_startup,
 56         .shutdown       = asoc_simple_shutdown,
 57         .hw_params      = asoc_simple_hw_params,
 58 };
 59 
 60 static int graph_get_dai_id(struct device_node *ep)
 61 {
 62         struct device_node *node;
 63         struct device_node *endpoint;
 64         struct of_endpoint info;
 65         int i, id;
 66         const u32 *reg;
 67         int ret;
 68 
 69         /* use driver specified DAI ID if exist */
 70         ret = snd_soc_get_dai_id(ep);
 71         if (ret != -ENOTSUPP)
 72                 return ret;
 73 
 74         /* use endpoint/port reg if exist */
 75         ret = of_graph_parse_endpoint(ep, &info);
 76         if (ret == 0) {
 77                 /*
 78                  * Because it will count port/endpoint if it doesn't have "reg".
 79                  * But, we can't judge whether it has "no reg", or "reg = <0>"
 80                  * only of_graph_parse_endpoint().
 81                  * We need to check "reg" property
 82                  */
 83                 if (of_get_property(ep,   "reg", NULL))
 84                         return info.id;
 85 
 86                 node = of_get_parent(ep);
 87                 reg = of_get_property(node, "reg", NULL);
 88                 of_node_put(node);
 89                 if (reg)
 90                         return info.port;
 91         }
 92         node = of_graph_get_port_parent(ep);
 93 
 94         /*
 95          * Non HDMI sound case, counting port/endpoint on its DT
 96          * is enough. Let's count it.
 97          */
 98         i = 0;
 99         id = -1;
100         for_each_endpoint_of_node(node, endpoint) {
101                 if (endpoint == ep)
102                         id = i;
103                 i++;
104         }
105 
106         of_node_put(node);
107 
108         if (id < 0)
109                 return -ENODEV;
110 
111         return id;
112 }
113 
114 static int asoc_simple_parse_dai(struct device_node *ep,
115                                  struct snd_soc_dai_link_component *dlc,
116                                  int *is_single_link)
117 {
118         struct device_node *node;
119         struct of_phandle_args args;
120         int ret;
121 
122         if (!ep)
123                 return 0;
124 
125         node = of_graph_get_port_parent(ep);
126 
127         /* Get dai->name */
128         args.np         = node;
129         args.args[0]    = graph_get_dai_id(ep);
130         args.args_count = (of_graph_get_endpoint_count(node) > 1);
131 
132         ret = snd_soc_get_dai_name(&args, &dlc->dai_name);
133         if (ret < 0)
134                 return ret;
135 
136         dlc->of_node = node;
137 
138         if (is_single_link)
139                 *is_single_link = of_graph_get_endpoint_count(node) == 1;
140 
141         return 0;
142 }
143 
144 static void graph_parse_convert(struct device *dev,
145                                 struct device_node *ep,
146                                 struct asoc_simple_data *adata)
147 {
148         struct device_node *top = dev->of_node;
149         struct device_node *port = of_get_parent(ep);
150         struct device_node *ports = of_get_parent(port);
151         struct device_node *node = of_graph_get_port_parent(ep);
152 
153         asoc_simple_parse_convert(dev, top,   NULL,   adata);
154         asoc_simple_parse_convert(dev, node,  PREFIX, adata);
155         asoc_simple_parse_convert(dev, ports, NULL,   adata);
156         asoc_simple_parse_convert(dev, port,  NULL,   adata);
157         asoc_simple_parse_convert(dev, ep,    NULL,   adata);
158 
159         of_node_put(port);
160         of_node_put(ports);
161         of_node_put(node);
162 }
163 
164 static void graph_parse_mclk_fs(struct device_node *top,
165                                 struct device_node *ep,
166                                 struct simple_dai_props *props)
167 {
168         struct device_node *port        = of_get_parent(ep);
169         struct device_node *ports       = of_get_parent(port);
170         struct device_node *node        = of_graph_get_port_parent(ep);
171 
172         of_property_read_u32(top,       "mclk-fs", &props->mclk_fs);
173         of_property_read_u32(ports,     "mclk-fs", &props->mclk_fs);
174         of_property_read_u32(port,      "mclk-fs", &props->mclk_fs);
175         of_property_read_u32(ep,        "mclk-fs", &props->mclk_fs);
176 
177         of_node_put(port);
178         of_node_put(ports);
179         of_node_put(node);
180 }
181 
182 static int graph_dai_link_of_dpcm(struct asoc_simple_priv *priv,
183                                   struct device_node *cpu_ep,
184                                   struct device_node *codec_ep,
185                                   struct link_info *li,
186                                   int dup_codec)
187 {
188         struct device *dev = simple_priv_to_dev(priv);
189         struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
190         struct simple_dai_props *dai_props = simple_priv_to_props(priv, li->link);
191         struct device_node *top = dev->of_node;
192         struct device_node *ep = li->cpu ? cpu_ep : codec_ep;
193         struct device_node *port;
194         struct device_node *ports;
195         struct device_node *node;
196         struct asoc_simple_dai *dai;
197         struct snd_soc_dai_link_component *cpus = dai_link->cpus;
198         struct snd_soc_dai_link_component *codecs = dai_link->codecs;
199         int ret;
200 
201         /* Do it all CPU endpoint, and 1st Codec endpoint */
202         if (!li->cpu && dup_codec)
203                 return 0;
204 
205         port    = of_get_parent(ep);
206         ports   = of_get_parent(port);
207         node    = of_graph_get_port_parent(ep);
208 
209         li->link++;
210 
211         dev_dbg(dev, "link_of DPCM (%pOF)\n", ep);
212 
213         if (li->cpu) {
214                 int is_single_links = 0;
215 
216                 /* BE is dummy */
217                 codecs->of_node         = NULL;
218                 codecs->dai_name        = "snd-soc-dummy-dai";
219                 codecs->name            = "snd-soc-dummy";
220 
221                 /* FE settings */
222                 dai_link->dynamic               = 1;
223                 dai_link->dpcm_merged_format    = 1;
224 
225                 dai =
226                 dai_props->cpu_dai      = &priv->dais[li->dais++];
227 
228                 ret = asoc_simple_parse_cpu(ep, dai_link, &is_single_links);
229                 if (ret)
230                         goto out_put_node;
231 
232                 ret = asoc_simple_parse_clk_cpu(dev, ep, dai_link, dai);
233                 if (ret < 0)
234                         goto out_put_node;
235 
236                 ret = asoc_simple_set_dailink_name(dev, dai_link,
237                                                    "fe.%s",
238                                                    cpus->dai_name);
239                 if (ret < 0)
240                         goto out_put_node;
241 
242                 /* card->num_links includes Codec */
243                 asoc_simple_canonicalize_cpu(dai_link, is_single_links);
244         } else {
245                 struct snd_soc_codec_conf *cconf;
246 
247                 /* FE is dummy */
248                 cpus->of_node           = NULL;
249                 cpus->dai_name          = "snd-soc-dummy-dai";
250                 cpus->name              = "snd-soc-dummy";
251 
252                 /* BE settings */
253                 dai_link->no_pcm                = 1;
254                 dai_link->be_hw_params_fixup    = asoc_simple_be_hw_params_fixup;
255 
256                 dai =
257                 dai_props->codec_dai    = &priv->dais[li->dais++];
258 
259                 cconf =
260                 dai_props->codec_conf   = &priv->codec_conf[li->conf++];
261 
262                 ret = asoc_simple_parse_codec(ep, dai_link);
263                 if (ret < 0)
264                         goto out_put_node;
265 
266                 ret = asoc_simple_parse_clk_codec(dev, ep, dai_link, dai);
267                 if (ret < 0)
268                         goto out_put_node;
269 
270                 ret = asoc_simple_set_dailink_name(dev, dai_link,
271                                                    "be.%s",
272                                                    codecs->dai_name);
273                 if (ret < 0)
274                         goto out_put_node;
275 
276                 /* check "prefix" from top node */
277                 snd_soc_of_parse_node_prefix(top, cconf, codecs->of_node,
278                                               "prefix");
279                 snd_soc_of_parse_node_prefix(node, cconf, codecs->of_node,
280                                              PREFIX "prefix");
281                 snd_soc_of_parse_node_prefix(ports, cconf, codecs->of_node,
282                                              "prefix");
283                 snd_soc_of_parse_node_prefix(port, cconf, codecs->of_node,
284                                              "prefix");
285         }
286 
287         graph_parse_convert(dev, ep, &dai_props->adata);
288         graph_parse_mclk_fs(top, ep, dai_props);
289 
290         asoc_simple_canonicalize_platform(dai_link);
291 
292         ret = asoc_simple_parse_tdm(ep, dai);
293         if (ret)
294                 goto out_put_node;
295 
296         ret = asoc_simple_parse_daifmt(dev, cpu_ep, codec_ep,
297                                        NULL, &dai_link->dai_fmt);
298         if (ret < 0)
299                 goto out_put_node;
300 
301         dai_link->dpcm_playback         = 1;
302         dai_link->dpcm_capture          = 1;
303         dai_link->ops                   = &graph_ops;
304         dai_link->init                  = asoc_simple_dai_init;
305 
306 out_put_node:
307         of_node_put(ports);
308         of_node_put(port);
309         of_node_put(node);
310         return ret;
311 }
312 
313 static int graph_dai_link_of(struct asoc_simple_priv *priv,
314                              struct device_node *cpu_ep,
315                              struct device_node *codec_ep,
316                              struct link_info *li)
317 {
318         struct device *dev = simple_priv_to_dev(priv);
319         struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
320         struct simple_dai_props *dai_props = simple_priv_to_props(priv, li->link);
321         struct device_node *top = dev->of_node;
322         struct asoc_simple_dai *cpu_dai;
323         struct asoc_simple_dai *codec_dai;
324         int ret, single_cpu;
325 
326         /* Do it only CPU turn */
327         if (!li->cpu)
328                 return 0;
329 
330         dev_dbg(dev, "link_of (%pOF)\n", cpu_ep);
331 
332         li->link++;
333 
334         cpu_dai                 =
335         dai_props->cpu_dai      = &priv->dais[li->dais++];
336         codec_dai               =
337         dai_props->codec_dai    = &priv->dais[li->dais++];
338 
339         /* Factor to mclk, used in hw_params() */
340         graph_parse_mclk_fs(top, cpu_ep,   dai_props);
341         graph_parse_mclk_fs(top, codec_ep, dai_props);
342 
343         ret = asoc_simple_parse_daifmt(dev, cpu_ep, codec_ep,
344                                        NULL, &dai_link->dai_fmt);
345         if (ret < 0)
346                 return ret;
347 
348         ret = asoc_simple_parse_cpu(cpu_ep, dai_link, &single_cpu);
349         if (ret < 0)
350                 return ret;
351 
352         ret = asoc_simple_parse_codec(codec_ep, dai_link);
353         if (ret < 0)
354                 return ret;
355 
356         ret = asoc_simple_parse_tdm(cpu_ep, cpu_dai);
357         if (ret < 0)
358                 return ret;
359 
360         ret = asoc_simple_parse_tdm(codec_ep, codec_dai);
361         if (ret < 0)
362                 return ret;
363 
364         ret = asoc_simple_parse_clk_cpu(dev, cpu_ep, dai_link, cpu_dai);
365         if (ret < 0)
366                 return ret;
367 
368         ret = asoc_simple_parse_clk_codec(dev, codec_ep, dai_link, codec_dai);
369         if (ret < 0)
370                 return ret;
371 
372         ret = asoc_simple_set_dailink_name(dev, dai_link,
373                                            "%s-%s",
374                                            dai_link->cpus->dai_name,
375                                            dai_link->codecs->dai_name);
376         if (ret < 0)
377                 return ret;
378 
379         dai_link->ops = &graph_ops;
380         dai_link->init = asoc_simple_dai_init;
381 
382         asoc_simple_canonicalize_cpu(dai_link, single_cpu);
383         asoc_simple_canonicalize_platform(dai_link);
384 
385         return 0;
386 }
387 
388 static int graph_for_each_link(struct asoc_simple_priv *priv,
389                         struct link_info *li,
390                         int (*func_noml)(struct asoc_simple_priv *priv,
391                                          struct device_node *cpu_ep,
392                                          struct device_node *codec_ep,
393                                          struct link_info *li),
394                         int (*func_dpcm)(struct asoc_simple_priv *priv,
395                                          struct device_node *cpu_ep,
396                                          struct device_node *codec_ep,
397                                          struct link_info *li, int dup_codec))
398 {
399         struct of_phandle_iterator it;
400         struct device *dev = simple_priv_to_dev(priv);
401         struct device_node *node = dev->of_node;
402         struct device_node *cpu_port;
403         struct device_node *cpu_ep;
404         struct device_node *codec_ep;
405         struct device_node *codec_port;
406         struct device_node *codec_port_old = NULL;
407         struct asoc_simple_data adata;
408         uintptr_t dpcm_selectable = (uintptr_t)of_device_get_match_data(dev);
409         int rc, ret;
410 
411         /* loop for all listed CPU port */
412         of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
413                 cpu_port = it.node;
414                 cpu_ep   = NULL;
415 
416                 /* loop for all CPU endpoint */
417                 while (1) {
418                         cpu_ep = of_get_next_child(cpu_port, cpu_ep);
419                         if (!cpu_ep)
420                                 break;
421 
422                         /* get codec */
423                         codec_ep = of_graph_get_remote_endpoint(cpu_ep);
424                         codec_port = of_get_parent(codec_ep);
425 
426                         /* get convert-xxx property */
427                         memset(&adata, 0, sizeof(adata));
428                         graph_parse_convert(dev, codec_ep, &adata);
429                         graph_parse_convert(dev, cpu_ep,   &adata);
430 
431                         /*
432                          * It is DPCM
433                          * if Codec port has many endpoints,
434                          * or has convert-xxx property
435                          */
436                         if (dpcm_selectable &&
437                             ((of_get_child_count(codec_port) > 1) ||
438                              adata.convert_rate || adata.convert_channels))
439                                 ret = func_dpcm(priv, cpu_ep, codec_ep, li,
440                                                 (codec_port_old == codec_port));
441                         /* else normal sound */
442                         else
443                                 ret = func_noml(priv, cpu_ep, codec_ep, li);
444 
445                         of_node_put(codec_ep);
446                         of_node_put(codec_port);
447 
448                         if (ret < 0)
449                                 return ret;
450 
451                         codec_port_old = codec_port;
452                 }
453         }
454 
455         return 0;
456 }
457 
458 static int graph_parse_of(struct asoc_simple_priv *priv)
459 {
460         struct snd_soc_card *card = simple_priv_to_card(priv);
461         struct link_info li;
462         int ret;
463 
464         ret = asoc_simple_parse_widgets(card, NULL);
465         if (ret < 0)
466                 return ret;
467 
468         ret = asoc_simple_parse_routing(card, NULL);
469         if (ret < 0)
470                 return ret;
471 
472         memset(&li, 0, sizeof(li));
473         for (li.cpu = 1; li.cpu >= 0; li.cpu--) {
474                 /*
475                  * Detect all CPU first, and Detect all Codec 2nd.
476                  *
477                  * In Normal sound case, all DAIs are detected
478                  * as "CPU-Codec".
479                  *
480                  * In DPCM sound case,
481                  * all CPUs   are detected as "CPU-dummy", and
482                  * all Codecs are detected as "dummy-Codec".
483                  * To avoid random sub-device numbering,
484                  * detect "dummy-Codec" in last;
485                  */
486                 ret = graph_for_each_link(priv, &li,
487                                           graph_dai_link_of,
488                                           graph_dai_link_of_dpcm);
489                 if (ret < 0)
490                         return ret;
491         }
492 
493         return asoc_simple_parse_card_name(card, NULL);
494 }
495 
496 static int graph_count_noml(struct asoc_simple_priv *priv,
497                             struct device_node *cpu_ep,
498                             struct device_node *codec_ep,
499                             struct link_info *li)
500 {
501         struct device *dev = simple_priv_to_dev(priv);
502 
503         li->link += 1; /* 1xCPU-Codec */
504         li->dais += 2; /* 1xCPU + 1xCodec */
505 
506         dev_dbg(dev, "Count As Normal\n");
507 
508         return 0;
509 }
510 
511 static int graph_count_dpcm(struct asoc_simple_priv *priv,
512                             struct device_node *cpu_ep,
513                             struct device_node *codec_ep,
514                             struct link_info *li,
515                             int dup_codec)
516 {
517         struct device *dev = simple_priv_to_dev(priv);
518 
519         li->link++; /* 1xCPU-dummy */
520         li->dais++; /* 1xCPU */
521 
522         if (!dup_codec) {
523                 li->link++; /* 1xdummy-Codec */
524                 li->conf++; /* 1xdummy-Codec */
525                 li->dais++; /* 1xCodec */
526         }
527 
528         dev_dbg(dev, "Count As DPCM\n");
529 
530         return 0;
531 }
532 
533 static void graph_get_dais_count(struct asoc_simple_priv *priv,
534                                  struct link_info *li)
535 {
536         struct device *dev = simple_priv_to_dev(priv);
537 
538         /*
539          * link_num :   number of links.
540          *              CPU-Codec / CPU-dummy / dummy-Codec
541          * dais_num :   number of DAIs
542          * ccnf_num :   number of codec_conf
543          *              same number for "dummy-Codec"
544          *
545          * ex1)
546          * CPU0 --- Codec0      link : 5
547          * CPU1 --- Codec1      dais : 7
548          * CPU2 -/              ccnf : 1
549          * CPU3 --- Codec2
550          *
551          *      => 5 links = 2xCPU-Codec + 2xCPU-dummy + 1xdummy-Codec
552          *      => 7 DAIs  = 4xCPU + 3xCodec
553          *      => 1 ccnf  = 1xdummy-Codec
554          *
555          * ex2)
556          * CPU0 --- Codec0      link : 5
557          * CPU1 --- Codec1      dais : 6
558          * CPU2 -/              ccnf : 1
559          * CPU3 -/
560          *
561          *      => 5 links = 1xCPU-Codec + 3xCPU-dummy + 1xdummy-Codec
562          *      => 6 DAIs  = 4xCPU + 2xCodec
563          *      => 1 ccnf  = 1xdummy-Codec
564          *
565          * ex3)
566          * CPU0 --- Codec0      link : 6
567          * CPU1 -/              dais : 6
568          * CPU2 --- Codec1      ccnf : 2
569          * CPU3 -/
570          *
571          *      => 6 links = 0xCPU-Codec + 4xCPU-dummy + 2xdummy-Codec
572          *      => 6 DAIs  = 4xCPU + 2xCodec
573          *      => 2 ccnf  = 2xdummy-Codec
574          *
575          * ex4)
576          * CPU0 --- Codec0 (convert-rate)       link : 3
577          * CPU1 --- Codec1                      dais : 4
578          *                                      ccnf : 1
579          *
580          *      => 3 links = 1xCPU-Codec + 1xCPU-dummy + 1xdummy-Codec
581          *      => 4 DAIs  = 2xCPU + 2xCodec
582          *      => 1 ccnf  = 1xdummy-Codec
583          */
584         graph_for_each_link(priv, li,
585                             graph_count_noml,
586                             graph_count_dpcm);
587         dev_dbg(dev, "link %d, dais %d, ccnf %d\n",
588                 li->link, li->dais, li->conf);
589 }
590 
591 static int graph_card_probe(struct snd_soc_card *card)
592 {
593         struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(card);
594         int ret;
595 
596         ret = asoc_simple_init_hp(card, &priv->hp_jack, NULL);
597         if (ret < 0)
598                 return ret;
599 
600         ret = asoc_simple_init_mic(card, &priv->mic_jack, NULL);
601         if (ret < 0)
602                 return ret;
603 
604         return 0;
605 }
606 
607 static int graph_probe(struct platform_device *pdev)
608 {
609         struct asoc_simple_priv *priv;
610         struct device *dev = &pdev->dev;
611         struct snd_soc_card *card;
612         struct link_info li;
613         int ret;
614 
615         /* Allocate the private data and the DAI link array */
616         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
617         if (!priv)
618                 return -ENOMEM;
619 
620         card = simple_priv_to_card(priv);
621         card->owner             = THIS_MODULE;
622         card->dev               = dev;
623         card->dapm_widgets      = graph_dapm_widgets;
624         card->num_dapm_widgets  = ARRAY_SIZE(graph_dapm_widgets);
625         card->probe             = graph_card_probe;
626 
627         memset(&li, 0, sizeof(li));
628         graph_get_dais_count(priv, &li);
629         if (!li.link || !li.dais)
630                 return -EINVAL;
631 
632         ret = asoc_simple_init_priv(priv, &li);
633         if (ret < 0)
634                 return ret;
635 
636         priv->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW);
637         if (IS_ERR(priv->pa_gpio)) {
638                 ret = PTR_ERR(priv->pa_gpio);
639                 dev_err(dev, "failed to get amplifier gpio: %d\n", ret);
640                 return ret;
641         }
642 
643         ret = graph_parse_of(priv);
644         if (ret < 0) {
645                 if (ret != -EPROBE_DEFER)
646                         dev_err(dev, "parse error %d\n", ret);
647                 goto err;
648         }
649 
650         snd_soc_card_set_drvdata(card, priv);
651 
652         asoc_simple_debug_info(priv);
653 
654         ret = devm_snd_soc_register_card(dev, card);
655         if (ret < 0)
656                 goto err;
657 
658         return 0;
659 err:
660         asoc_simple_clean_reference(card);
661 
662         return ret;
663 }
664 
665 static int graph_remove(struct platform_device *pdev)
666 {
667         struct snd_soc_card *card = platform_get_drvdata(pdev);
668 
669         return asoc_simple_clean_reference(card);
670 }
671 
672 static const struct of_device_id graph_of_match[] = {
673         { .compatible = "audio-graph-card", },
674         { .compatible = "audio-graph-scu-card",
675           .data = (void *)DPCM_SELECTABLE },
676         {},
677 };
678 MODULE_DEVICE_TABLE(of, graph_of_match);
679 
680 static struct platform_driver graph_card = {
681         .driver = {
682                 .name = "asoc-audio-graph-card",
683                 .pm = &snd_soc_pm_ops,
684                 .of_match_table = graph_of_match,
685         },
686         .probe = graph_probe,
687         .remove = graph_remove,
688 };
689 module_platform_driver(graph_card);
690 
691 MODULE_ALIAS("platform:asoc-audio-graph-card");
692 MODULE_LICENSE("GPL v2");
693 MODULE_DESCRIPTION("ASoC Audio Graph Sound Card");
694 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
695 

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