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0001 // SPDX-License-Identifier: GPL-2.0
0002 //
0003 // ASoC audio graph sound card support
0004 //
0005 // Copyright (C) 2016 Renesas Solutions Corp.
0006 // Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
0007 //
0008 // based on ${LINUX}/sound/soc/generic/simple-card.c
0009 
0010 #include <linux/clk.h>
0011 #include <linux/device.h>
0012 #include <linux/gpio.h>
0013 #include <linux/gpio/consumer.h>
0014 #include <linux/module.h>
0015 #include <linux/of.h>
0016 #include <linux/of_device.h>
0017 #include <linux/of_gpio.h>
0018 #include <linux/of_graph.h>
0019 #include <linux/platform_device.h>
0020 #include <linux/string.h>
0021 #include <sound/graph_card.h>
0022 
0023 #define DPCM_SELECTABLE 1
0024 
0025 static int graph_outdrv_event(struct snd_soc_dapm_widget *w,
0026                   struct snd_kcontrol *kcontrol,
0027                   int event)
0028 {
0029     struct snd_soc_dapm_context *dapm = w->dapm;
0030     struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(dapm->card);
0031 
0032     switch (event) {
0033     case SND_SOC_DAPM_POST_PMU:
0034         gpiod_set_value_cansleep(priv->pa_gpio, 1);
0035         break;
0036     case SND_SOC_DAPM_PRE_PMD:
0037         gpiod_set_value_cansleep(priv->pa_gpio, 0);
0038         break;
0039     default:
0040         return -EINVAL;
0041     }
0042 
0043     return 0;
0044 }
0045 
0046 static const struct snd_soc_dapm_widget graph_dapm_widgets[] = {
0047     SND_SOC_DAPM_OUT_DRV_E("Amplifier", SND_SOC_NOPM,
0048                    0, 0, NULL, 0, graph_outdrv_event,
0049                    SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
0050 };
0051 
0052 static const struct snd_soc_ops graph_ops = {
0053     .startup    = asoc_simple_startup,
0054     .shutdown   = asoc_simple_shutdown,
0055     .hw_params  = asoc_simple_hw_params,
0056 };
0057 
0058 static int graph_get_dai_id(struct device_node *ep)
0059 {
0060     struct device_node *node;
0061     struct device_node *endpoint;
0062     struct of_endpoint info;
0063     int i, id;
0064     const u32 *reg;
0065     int ret;
0066 
0067     /* use driver specified DAI ID if exist */
0068     ret = snd_soc_get_dai_id(ep);
0069     if (ret != -ENOTSUPP)
0070         return ret;
0071 
0072     /* use endpoint/port reg if exist */
0073     ret = of_graph_parse_endpoint(ep, &info);
0074     if (ret == 0) {
0075         /*
0076          * Because it will count port/endpoint if it doesn't have "reg".
0077          * But, we can't judge whether it has "no reg", or "reg = <0>"
0078          * only of_graph_parse_endpoint().
0079          * We need to check "reg" property
0080          */
0081         if (of_get_property(ep,   "reg", NULL))
0082             return info.id;
0083 
0084         node = of_get_parent(ep);
0085         reg = of_get_property(node, "reg", NULL);
0086         of_node_put(node);
0087         if (reg)
0088             return info.port;
0089     }
0090     node = of_graph_get_port_parent(ep);
0091 
0092     /*
0093      * Non HDMI sound case, counting port/endpoint on its DT
0094      * is enough. Let's count it.
0095      */
0096     i = 0;
0097     id = -1;
0098     for_each_endpoint_of_node(node, endpoint) {
0099         if (endpoint == ep)
0100             id = i;
0101         i++;
0102     }
0103 
0104     of_node_put(node);
0105 
0106     if (id < 0)
0107         return -ENODEV;
0108 
0109     return id;
0110 }
0111 
0112 static bool soc_component_is_pcm(struct snd_soc_dai_link_component *dlc)
0113 {
0114     struct snd_soc_dai *dai = snd_soc_find_dai_with_mutex(dlc);
0115 
0116     if (dai && (dai->component->driver->pcm_construct ||
0117             dai->driver->pcm_new))
0118         return true;
0119 
0120     return false;
0121 }
0122 
0123 static int asoc_simple_parse_dai(struct device_node *ep,
0124                  struct snd_soc_dai_link_component *dlc,
0125                  int *is_single_link)
0126 {
0127     struct device_node *node;
0128     struct of_phandle_args args;
0129     int ret;
0130 
0131     if (!ep)
0132         return 0;
0133 
0134     node = of_graph_get_port_parent(ep);
0135 
0136     /* Get dai->name */
0137     args.np     = node;
0138     args.args[0]    = graph_get_dai_id(ep);
0139     args.args_count = (of_graph_get_endpoint_count(node) > 1);
0140 
0141     /*
0142      * FIXME
0143      *
0144      * Here, dlc->dai_name is pointer to CPU/Codec DAI name.
0145      * If user unbinded CPU or Codec driver, but not for Sound Card,
0146      * dlc->dai_name is keeping unbinded CPU or Codec
0147      * driver's pointer.
0148      *
0149      * If user re-bind CPU or Codec driver again, ALSA SoC will try
0150      * to rebind Card via snd_soc_try_rebind_card(), but because of
0151      * above reason, it might can't bind Sound Card.
0152      * Because Sound Card is pointing to released dai_name pointer.
0153      *
0154      * To avoid this rebind Card issue,
0155      * 1) It needs to alloc memory to keep dai_name eventhough
0156      *    CPU or Codec driver was unbinded, or
0157      * 2) user need to rebind Sound Card everytime
0158      *    if he unbinded CPU or Codec.
0159      */
0160     ret = snd_soc_get_dai_name(&args, &dlc->dai_name);
0161     if (ret < 0) {
0162         of_node_put(node);
0163         return ret;
0164     }
0165 
0166     dlc->of_node = node;
0167 
0168     if (is_single_link)
0169         *is_single_link = of_graph_get_endpoint_count(node) == 1;
0170 
0171     return 0;
0172 }
0173 
0174 static void graph_parse_convert(struct device *dev,
0175                 struct device_node *ep,
0176                 struct asoc_simple_data *adata)
0177 {
0178     struct device_node *top = dev->of_node;
0179     struct device_node *port = of_get_parent(ep);
0180     struct device_node *ports = of_get_parent(port);
0181     struct device_node *node = of_graph_get_port_parent(ep);
0182 
0183     asoc_simple_parse_convert(top,   NULL,   adata);
0184     if (of_node_name_eq(ports, "ports"))
0185         asoc_simple_parse_convert(ports, NULL, adata);
0186     asoc_simple_parse_convert(port,  NULL,   adata);
0187     asoc_simple_parse_convert(ep,    NULL,   adata);
0188 
0189     of_node_put(port);
0190     of_node_put(ports);
0191     of_node_put(node);
0192 }
0193 
0194 static void graph_parse_mclk_fs(struct device_node *top,
0195                 struct device_node *ep,
0196                 struct simple_dai_props *props)
0197 {
0198     struct device_node *port    = of_get_parent(ep);
0199     struct device_node *ports   = of_get_parent(port);
0200 
0201     of_property_read_u32(top,   "mclk-fs", &props->mclk_fs);
0202     if (of_node_name_eq(ports, "ports"))
0203         of_property_read_u32(ports, "mclk-fs", &props->mclk_fs);
0204     of_property_read_u32(port,  "mclk-fs", &props->mclk_fs);
0205     of_property_read_u32(ep,    "mclk-fs", &props->mclk_fs);
0206 
0207     of_node_put(port);
0208     of_node_put(ports);
0209 }
0210 
0211 static int graph_parse_node(struct asoc_simple_priv *priv,
0212                 struct device_node *ep,
0213                 struct link_info *li,
0214                 int *cpu)
0215 {
0216     struct device *dev = simple_priv_to_dev(priv);
0217     struct device_node *top = dev->of_node;
0218     struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
0219     struct simple_dai_props *dai_props = simple_priv_to_props(priv, li->link);
0220     struct snd_soc_dai_link_component *dlc;
0221     struct asoc_simple_dai *dai;
0222     int ret;
0223 
0224     if (cpu) {
0225         dlc = asoc_link_to_cpu(dai_link, 0);
0226         dai = simple_props_to_dai_cpu(dai_props, 0);
0227     } else {
0228         dlc = asoc_link_to_codec(dai_link, 0);
0229         dai = simple_props_to_dai_codec(dai_props, 0);
0230     }
0231 
0232     graph_parse_mclk_fs(top, ep, dai_props);
0233 
0234     ret = asoc_simple_parse_dai(ep, dlc, cpu);
0235     if (ret < 0)
0236         return ret;
0237 
0238     ret = asoc_simple_parse_tdm(ep, dai);
0239     if (ret < 0)
0240         return ret;
0241 
0242     ret = asoc_simple_parse_clk(dev, ep, dai, dlc);
0243     if (ret < 0)
0244         return ret;
0245 
0246     return 0;
0247 }
0248 
0249 static int graph_link_init(struct asoc_simple_priv *priv,
0250                struct device_node *cpu_ep,
0251                struct device_node *codec_ep,
0252                struct link_info *li,
0253                char *name)
0254 {
0255     struct device *dev = simple_priv_to_dev(priv);
0256     struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
0257     int ret;
0258 
0259     ret = asoc_simple_parse_daifmt(dev, cpu_ep, codec_ep,
0260                        NULL, &dai_link->dai_fmt);
0261     if (ret < 0)
0262         return ret;
0263 
0264     dai_link->init      = asoc_simple_dai_init;
0265     dai_link->ops       = &graph_ops;
0266     if (priv->ops)
0267         dai_link->ops   = priv->ops;
0268 
0269     return asoc_simple_set_dailink_name(dev, dai_link, name);
0270 }
0271 
0272 static int graph_dai_link_of_dpcm(struct asoc_simple_priv *priv,
0273                   struct device_node *cpu_ep,
0274                   struct device_node *codec_ep,
0275                   struct link_info *li)
0276 {
0277     struct device *dev = simple_priv_to_dev(priv);
0278     struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
0279     struct simple_dai_props *dai_props = simple_priv_to_props(priv, li->link);
0280     struct device_node *top = dev->of_node;
0281     struct device_node *ep = li->cpu ? cpu_ep : codec_ep;
0282     char dai_name[64];
0283     int ret;
0284 
0285     dev_dbg(dev, "link_of DPCM (%pOF)\n", ep);
0286 
0287     if (li->cpu) {
0288         struct snd_soc_card *card = simple_priv_to_card(priv);
0289         struct snd_soc_dai_link_component *cpus = asoc_link_to_cpu(dai_link, 0);
0290         struct snd_soc_dai_link_component *platforms = asoc_link_to_platform(dai_link, 0);
0291         int is_single_links = 0;
0292 
0293         /* Codec is dummy */
0294 
0295         /* FE settings */
0296         dai_link->dynamic       = 1;
0297         dai_link->dpcm_merged_format    = 1;
0298 
0299         ret = graph_parse_node(priv, cpu_ep, li, &is_single_links);
0300         if (ret)
0301             return ret;
0302 
0303         snprintf(dai_name, sizeof(dai_name),
0304              "fe.%pOFP.%s", cpus->of_node, cpus->dai_name);
0305         /*
0306          * In BE<->BE connections it is not required to create
0307          * PCM devices at CPU end of the dai link and thus 'no_pcm'
0308          * flag needs to be set. It is useful when there are many
0309          * BE components and some of these have to be connected to
0310          * form a valid audio path.
0311          *
0312          * For example: FE <-> BE1 <-> BE2 <-> ... <-> BEn where
0313          * there are 'n' BE components in the path.
0314          */
0315         if (card->component_chaining && !soc_component_is_pcm(cpus)) {
0316             dai_link->no_pcm = 1;
0317             dai_link->be_hw_params_fixup = asoc_simple_be_hw_params_fixup;
0318         }
0319 
0320         asoc_simple_canonicalize_cpu(cpus, is_single_links);
0321         asoc_simple_canonicalize_platform(platforms, cpus);
0322     } else {
0323         struct snd_soc_codec_conf *cconf = simple_props_to_codec_conf(dai_props, 0);
0324         struct snd_soc_dai_link_component *codecs = asoc_link_to_codec(dai_link, 0);
0325         struct device_node *port;
0326         struct device_node *ports;
0327 
0328         /* CPU is dummy */
0329 
0330         /* BE settings */
0331         dai_link->no_pcm        = 1;
0332         dai_link->be_hw_params_fixup    = asoc_simple_be_hw_params_fixup;
0333 
0334         ret = graph_parse_node(priv, codec_ep, li, NULL);
0335         if (ret < 0)
0336             return ret;
0337 
0338         snprintf(dai_name, sizeof(dai_name),
0339              "be.%pOFP.%s", codecs->of_node, codecs->dai_name);
0340 
0341         /* check "prefix" from top node */
0342         port = of_get_parent(ep);
0343         ports = of_get_parent(port);
0344         snd_soc_of_parse_node_prefix(top, cconf, codecs->of_node,
0345                           "prefix");
0346         if (of_node_name_eq(ports, "ports"))
0347             snd_soc_of_parse_node_prefix(ports, cconf, codecs->of_node, "prefix");
0348         snd_soc_of_parse_node_prefix(port, cconf, codecs->of_node,
0349                          "prefix");
0350 
0351         of_node_put(ports);
0352         of_node_put(port);
0353     }
0354 
0355     graph_parse_convert(dev, ep, &dai_props->adata);
0356 
0357     snd_soc_dai_link_set_capabilities(dai_link);
0358 
0359     ret = graph_link_init(priv, cpu_ep, codec_ep, li, dai_name);
0360 
0361     li->link++;
0362 
0363     return ret;
0364 }
0365 
0366 static int graph_dai_link_of(struct asoc_simple_priv *priv,
0367                  struct device_node *cpu_ep,
0368                  struct device_node *codec_ep,
0369                  struct link_info *li)
0370 {
0371     struct device *dev = simple_priv_to_dev(priv);
0372     struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
0373     struct snd_soc_dai_link_component *cpus = asoc_link_to_cpu(dai_link, 0);
0374     struct snd_soc_dai_link_component *codecs = asoc_link_to_codec(dai_link, 0);
0375     struct snd_soc_dai_link_component *platforms = asoc_link_to_platform(dai_link, 0);
0376     char dai_name[64];
0377     int ret, is_single_links = 0;
0378 
0379     dev_dbg(dev, "link_of (%pOF)\n", cpu_ep);
0380 
0381     ret = graph_parse_node(priv, cpu_ep, li, &is_single_links);
0382     if (ret < 0)
0383         return ret;
0384 
0385     ret = graph_parse_node(priv, codec_ep, li, NULL);
0386     if (ret < 0)
0387         return ret;
0388 
0389     snprintf(dai_name, sizeof(dai_name),
0390          "%s-%s", cpus->dai_name, codecs->dai_name);
0391 
0392     asoc_simple_canonicalize_cpu(cpus, is_single_links);
0393     asoc_simple_canonicalize_platform(platforms, cpus);
0394 
0395     ret = graph_link_init(priv, cpu_ep, codec_ep, li, dai_name);
0396     if (ret < 0)
0397         return ret;
0398 
0399     li->link++;
0400 
0401     return 0;
0402 }
0403 
0404 static inline bool parse_as_dpcm_link(struct asoc_simple_priv *priv,
0405                       struct device_node *codec_port,
0406                       struct asoc_simple_data *adata)
0407 {
0408     if (priv->force_dpcm)
0409         return true;
0410 
0411     if (!priv->dpcm_selectable)
0412         return false;
0413 
0414     /*
0415      * It is DPCM
0416      * if Codec port has many endpoints,
0417      * or has convert-xxx property
0418      */
0419     if ((of_get_child_count(codec_port) > 1) ||
0420         (adata->convert_rate || adata->convert_channels))
0421         return true;
0422 
0423     return false;
0424 }
0425 
0426 static int __graph_for_each_link(struct asoc_simple_priv *priv,
0427             struct link_info *li,
0428             int (*func_noml)(struct asoc_simple_priv *priv,
0429                      struct device_node *cpu_ep,
0430                      struct device_node *codec_ep,
0431                      struct link_info *li),
0432             int (*func_dpcm)(struct asoc_simple_priv *priv,
0433                      struct device_node *cpu_ep,
0434                      struct device_node *codec_ep,
0435                      struct link_info *li))
0436 {
0437     struct of_phandle_iterator it;
0438     struct device *dev = simple_priv_to_dev(priv);
0439     struct device_node *node = dev->of_node;
0440     struct device_node *cpu_port;
0441     struct device_node *cpu_ep;
0442     struct device_node *codec_ep;
0443     struct device_node *codec_port;
0444     struct device_node *codec_port_old = NULL;
0445     struct asoc_simple_data adata;
0446     int rc, ret = 0;
0447 
0448     /* loop for all listed CPU port */
0449     of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
0450         cpu_port = it.node;
0451         cpu_ep   = NULL;
0452 
0453         /* loop for all CPU endpoint */
0454         while (1) {
0455             cpu_ep = of_get_next_child(cpu_port, cpu_ep);
0456             if (!cpu_ep)
0457                 break;
0458 
0459             /* get codec */
0460             codec_ep = of_graph_get_remote_endpoint(cpu_ep);
0461             codec_port = of_get_parent(codec_ep);
0462 
0463             /* get convert-xxx property */
0464             memset(&adata, 0, sizeof(adata));
0465             graph_parse_convert(dev, codec_ep, &adata);
0466             graph_parse_convert(dev, cpu_ep,   &adata);
0467 
0468             /* check if link requires DPCM parsing */
0469             if (parse_as_dpcm_link(priv, codec_port, &adata)) {
0470                 /*
0471                  * Codec endpoint can be NULL for pluggable audio HW.
0472                  * Platform DT can populate the Codec endpoint depending on the
0473                  * plugged HW.
0474                  */
0475                 /* Do it all CPU endpoint, and 1st Codec endpoint */
0476                 if (li->cpu ||
0477                     ((codec_port_old != codec_port) && codec_ep))
0478                     ret = func_dpcm(priv, cpu_ep, codec_ep, li);
0479             /* else normal sound */
0480             } else {
0481                 if (li->cpu)
0482                     ret = func_noml(priv, cpu_ep, codec_ep, li);
0483             }
0484 
0485             of_node_put(codec_ep);
0486             of_node_put(codec_port);
0487 
0488             if (ret < 0)
0489                 return ret;
0490 
0491             codec_port_old = codec_port;
0492         }
0493     }
0494 
0495     return 0;
0496 }
0497 
0498 static int graph_for_each_link(struct asoc_simple_priv *priv,
0499                    struct link_info *li,
0500                    int (*func_noml)(struct asoc_simple_priv *priv,
0501                         struct device_node *cpu_ep,
0502                         struct device_node *codec_ep,
0503                         struct link_info *li),
0504                    int (*func_dpcm)(struct asoc_simple_priv *priv,
0505                         struct device_node *cpu_ep,
0506                         struct device_node *codec_ep,
0507                         struct link_info *li))
0508 {
0509     int ret;
0510     /*
0511      * Detect all CPU first, and Detect all Codec 2nd.
0512      *
0513      * In Normal sound case, all DAIs are detected
0514      * as "CPU-Codec".
0515      *
0516      * In DPCM sound case,
0517      * all CPUs   are detected as "CPU-dummy", and
0518      * all Codecs are detected as "dummy-Codec".
0519      * To avoid random sub-device numbering,
0520      * detect "dummy-Codec" in last;
0521      */
0522     for (li->cpu = 1; li->cpu >= 0; li->cpu--) {
0523         ret = __graph_for_each_link(priv, li, func_noml, func_dpcm);
0524         if (ret < 0)
0525             break;
0526     }
0527 
0528     return ret;
0529 }
0530 
0531 static int graph_get_dais_count(struct asoc_simple_priv *priv,
0532                 struct link_info *li);
0533 
0534 int audio_graph_parse_of(struct asoc_simple_priv *priv, struct device *dev)
0535 {
0536     struct snd_soc_card *card = simple_priv_to_card(priv);
0537     struct link_info *li;
0538     int ret;
0539 
0540     li = devm_kzalloc(dev, sizeof(*li), GFP_KERNEL);
0541     if (!li)
0542         return -ENOMEM;
0543 
0544     card->owner = THIS_MODULE;
0545     card->dev = dev;
0546 
0547     ret = graph_get_dais_count(priv, li);
0548     if (ret < 0)
0549         return ret;
0550 
0551     if (!li->link)
0552         return -EINVAL;
0553 
0554     ret = asoc_simple_init_priv(priv, li);
0555     if (ret < 0)
0556         return ret;
0557 
0558     priv->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW);
0559     if (IS_ERR(priv->pa_gpio)) {
0560         ret = PTR_ERR(priv->pa_gpio);
0561         dev_err(dev, "failed to get amplifier gpio: %d\n", ret);
0562         return ret;
0563     }
0564 
0565     ret = asoc_simple_parse_widgets(card, NULL);
0566     if (ret < 0)
0567         return ret;
0568 
0569     ret = asoc_simple_parse_routing(card, NULL);
0570     if (ret < 0)
0571         return ret;
0572 
0573     memset(li, 0, sizeof(*li));
0574     ret = graph_for_each_link(priv, li,
0575                   graph_dai_link_of,
0576                   graph_dai_link_of_dpcm);
0577     if (ret < 0)
0578         goto err;
0579 
0580     ret = asoc_simple_parse_card_name(card, NULL);
0581     if (ret < 0)
0582         goto err;
0583 
0584     snd_soc_card_set_drvdata(card, priv);
0585 
0586     asoc_simple_debug_info(priv);
0587 
0588     ret = devm_snd_soc_register_card(dev, card);
0589     if (ret < 0)
0590         goto err;
0591 
0592     devm_kfree(dev, li);
0593     return 0;
0594 
0595 err:
0596     asoc_simple_clean_reference(card);
0597 
0598     return dev_err_probe(dev, ret, "parse error\n");
0599 }
0600 EXPORT_SYMBOL_GPL(audio_graph_parse_of);
0601 
0602 static int graph_count_noml(struct asoc_simple_priv *priv,
0603                 struct device_node *cpu_ep,
0604                 struct device_node *codec_ep,
0605                 struct link_info *li)
0606 {
0607     struct device *dev = simple_priv_to_dev(priv);
0608 
0609     if (li->link >= SNDRV_MAX_LINKS) {
0610         dev_err(dev, "too many links\n");
0611         return -EINVAL;
0612     }
0613 
0614     li->num[li->link].cpus      = 1;
0615     li->num[li->link].codecs    = 1;
0616     li->num[li->link].platforms     = 1;
0617 
0618     li->link += 1; /* 1xCPU-Codec */
0619 
0620     dev_dbg(dev, "Count As Normal\n");
0621 
0622     return 0;
0623 }
0624 
0625 static int graph_count_dpcm(struct asoc_simple_priv *priv,
0626                 struct device_node *cpu_ep,
0627                 struct device_node *codec_ep,
0628                 struct link_info *li)
0629 {
0630     struct device *dev = simple_priv_to_dev(priv);
0631 
0632     if (li->link >= SNDRV_MAX_LINKS) {
0633         dev_err(dev, "too many links\n");
0634         return -EINVAL;
0635     }
0636 
0637     if (li->cpu) {
0638         li->num[li->link].cpus      = 1;
0639         li->num[li->link].platforms     = 1;
0640 
0641         li->link++; /* 1xCPU-dummy */
0642     } else {
0643         li->num[li->link].codecs    = 1;
0644 
0645         li->link++; /* 1xdummy-Codec */
0646     }
0647 
0648     dev_dbg(dev, "Count As DPCM\n");
0649 
0650     return 0;
0651 }
0652 
0653 static int graph_get_dais_count(struct asoc_simple_priv *priv,
0654                 struct link_info *li)
0655 {
0656     /*
0657      * link_num :   number of links.
0658      *      CPU-Codec / CPU-dummy / dummy-Codec
0659      * dais_num :   number of DAIs
0660      * ccnf_num :   number of codec_conf
0661      *      same number for "dummy-Codec"
0662      *
0663      * ex1)
0664      * CPU0 --- Codec0  link : 5
0665      * CPU1 --- Codec1  dais : 7
0666      * CPU2 -/      ccnf : 1
0667      * CPU3 --- Codec2
0668      *
0669      *  => 5 links = 2xCPU-Codec + 2xCPU-dummy + 1xdummy-Codec
0670      *  => 7 DAIs  = 4xCPU + 3xCodec
0671      *  => 1 ccnf  = 1xdummy-Codec
0672      *
0673      * ex2)
0674      * CPU0 --- Codec0  link : 5
0675      * CPU1 --- Codec1  dais : 6
0676      * CPU2 -/      ccnf : 1
0677      * CPU3 -/
0678      *
0679      *  => 5 links = 1xCPU-Codec + 3xCPU-dummy + 1xdummy-Codec
0680      *  => 6 DAIs  = 4xCPU + 2xCodec
0681      *  => 1 ccnf  = 1xdummy-Codec
0682      *
0683      * ex3)
0684      * CPU0 --- Codec0  link : 6
0685      * CPU1 -/      dais : 6
0686      * CPU2 --- Codec1  ccnf : 2
0687      * CPU3 -/
0688      *
0689      *  => 6 links = 0xCPU-Codec + 4xCPU-dummy + 2xdummy-Codec
0690      *  => 6 DAIs  = 4xCPU + 2xCodec
0691      *  => 2 ccnf  = 2xdummy-Codec
0692      *
0693      * ex4)
0694      * CPU0 --- Codec0 (convert-rate)   link : 3
0695      * CPU1 --- Codec1          dais : 4
0696      *                  ccnf : 1
0697      *
0698      *  => 3 links = 1xCPU-Codec + 1xCPU-dummy + 1xdummy-Codec
0699      *  => 4 DAIs  = 2xCPU + 2xCodec
0700      *  => 1 ccnf  = 1xdummy-Codec
0701      */
0702     return graph_for_each_link(priv, li,
0703                    graph_count_noml,
0704                    graph_count_dpcm);
0705 }
0706 
0707 static int graph_probe(struct platform_device *pdev)
0708 {
0709     struct asoc_simple_priv *priv;
0710     struct device *dev = &pdev->dev;
0711     struct snd_soc_card *card;
0712 
0713     /* Allocate the private data and the DAI link array */
0714     priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
0715     if (!priv)
0716         return -ENOMEM;
0717 
0718     card = simple_priv_to_card(priv);
0719     card->dapm_widgets  = graph_dapm_widgets;
0720     card->num_dapm_widgets  = ARRAY_SIZE(graph_dapm_widgets);
0721     card->probe     = asoc_graph_card_probe;
0722 
0723     if (of_device_get_match_data(dev))
0724         priv->dpcm_selectable = 1;
0725 
0726     return audio_graph_parse_of(priv, dev);
0727 }
0728 
0729 static const struct of_device_id graph_of_match[] = {
0730     { .compatible = "audio-graph-card", },
0731     { .compatible = "audio-graph-scu-card",
0732       .data = (void *)DPCM_SELECTABLE },
0733     {},
0734 };
0735 MODULE_DEVICE_TABLE(of, graph_of_match);
0736 
0737 static struct platform_driver graph_card = {
0738     .driver = {
0739         .name = "asoc-audio-graph-card",
0740         .pm = &snd_soc_pm_ops,
0741         .of_match_table = graph_of_match,
0742     },
0743     .probe = graph_probe,
0744     .remove = asoc_simple_remove,
0745 };
0746 module_platform_driver(graph_card);
0747 
0748 MODULE_ALIAS("platform:asoc-audio-graph-card");
0749 MODULE_LICENSE("GPL v2");
0750 MODULE_DESCRIPTION("ASoC Audio Graph Sound Card");
0751 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
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