ASoC: add snd_soc_get_dai_id() function

ALSA SoC needs to know connected DAI ID for detecting.
It is not a big problem if device/driver was only for sound,
but getting DAI ID will be difficult if device includes both
Video/Sound, like HDMI.
To solve this issue, this patch adds new snd_soc_get_dai_id() and
its related .of_xlate_dai_id callback on component driver.
In below case, we can handle Sound port (= port@2) as ID = 0
if .of_xlate_dai_id has its support.

	hdmi {
		port@0 { /* VIDEO */ };
		port@1 { /* VIDEO */ };
		port@2 { /* SOUND */ };
	};

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 5170fd81e1fd0886c465225b72748c44792240d5..9c94b97c17f8ebc830f9ccac9e00c9a0b0e1d463 100644 (file)
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -803,6 +803,8 @@ struct snd_soc_component_driver {
        int (*of_xlate_dai_name)(struct snd_soc_component *component,
                                 struct of_phandle_args *args,
                                 const char **dai_name);
+       int (*of_xlate_dai_id)(struct snd_soc_component *comment,
+                              struct device_node *endpoint);
        void (*seq_notifier)(struct snd_soc_component *, enum snd_soc_dapm_type,
                int subseq);
        int (*stream_event)(struct snd_soc_component *, int event);
@@ -1676,6 +1678,7 @@ unsigned int snd_soc_of_parse_daifmt(struct device_node *np,
                                     const char *prefix,
                                     struct device_node **bitclkmaster,
                                     struct device_node **framemaster);
+int snd_soc_get_dai_id(struct device_node *ep);
 int snd_soc_get_dai_name(struct of_phandle_args *args,
                         const char **dai_name);
 int snd_soc_of_get_dai_name(struct device_node *of_node,

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index aae099c0e50280d67f153d6769ac4237d531e169..b0fb17082691def49a57f10631b4fb17a51e9d33 100644 (file)
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -34,6 +34,7 @@
 #include <linux/ctype.h>
 #include <linux/slab.h>
 #include <linux/of.h>
+#include <linux/of_graph.h>
 #include <linux/dmi.h>
 #include <sound/core.h>
 #include <sound/jack.h>
@@ -4044,6 +4045,42 @@ unsigned int snd_soc_of_parse_daifmt(struct device_node *np,
 }
 EXPORT_SYMBOL_GPL(snd_soc_of_parse_daifmt);
 
+int snd_soc_get_dai_id(struct device_node *ep)
+{
+       struct snd_soc_component *pos;
+       struct device_node *node;
+       int ret;
+
+       node = of_graph_get_port_parent(ep);
+
+       /*
+        * For example HDMI case, HDMI has video/sound port,
+        * but ALSA SoC needs sound port number only.
+        * Thus counting HDMI DT port/endpoint doesn't work.
+        * Then, it should have .of_xlate_dai_id
+        */
+       ret = -ENOTSUPP;
+       mutex_lock(&client_mutex);
+       list_for_each_entry(pos, &component_list, list) {
+               struct device_node *component_of_node = pos->dev->of_node;
+
+               if (!component_of_node && pos->dev->parent)
+                       component_of_node = pos->dev->parent->of_node;
+
+               if (component_of_node != node)
+                       continue;
+
+               if (pos->driver->of_xlate_dai_id)
+                       ret = pos->driver->of_xlate_dai_id(pos, ep);
+
+               break;
+       }
+       mutex_unlock(&client_mutex);
+
+       return ret;
+}
+EXPORT_SYMBOL_GPL(snd_soc_get_dai_id);
+
 int snd_soc_get_dai_name(struct of_phandle_args *args,
                                const char **dai_name)
 {