ASoC: Move debugfs registration to the component level

The debugfs registration is mostly identical between platforms and CODECs. This
patches consolidates the two implementations at the component level.

Unfortunately there are still a couple of CODEC specific debugfs files that are
related to legacy ASoC IO that need to be registered. For this a new callback is
added to the component struct that will be initialized when a CODEC is
registered and will be used to register the CODEC specific files. Once there are
no drivers left using legacy IO this can be removed again.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

2 files changed, 67 insertions, 75 deletions

diff --git a/include/sound/soc.h b/include/sound/soc.h
index be6ecae247b0..0ab8b1e4a5d2 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -728,9 +728,24 @@ struct snd_soc_component {
 
         struct mutex io_mutex;
 
+#ifdef CONFIG_DEBUG_FS
+        struct dentry *debugfs_root;
+#endif
+
+        /*
+        * DO NOT use any of the fields below in drivers, they are temporary and
+        * are going to be removed again soon. If you use them in driver code the
+        * driver will be marked as BROKEN when these fields are removed.
+        */
+
         /* Don't use these, use snd_soc_component_get_dapm() */
         struct snd_soc_dapm_context dapm;
         struct snd_soc_dapm_context *dapm_ptr;
+
+#ifdef CONFIG_DEBUG_FS
+        void (*init_debugfs)(struct snd_soc_component *component);
+        const char *debugfs_prefix;
+#endif
 };
 
 /* SoC Audio Codec device */
@@ -766,7 +781,6 @@ struct snd_soc_codec {
         struct snd_soc_dapm_context dapm;
 
 #ifdef CONFIG_DEBUG_FS
-        struct dentry *debugfs_codec_root;
         struct dentry *debugfs_reg;
 #endif
 };
@@ -879,10 +893,6 @@ struct snd_soc_platform {
         struct list_head list;
 
         struct snd_soc_component component;
-
-#ifdef CONFIG_DEBUG_FS
-        struct dentry *debugfs_platform_root;
-#endif
 };
 
 struct snd_soc_dai_link {
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index d4bfd4a9076f..79371a77f324 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -270,79 +270,56 @@ static const struct file_operations codec_reg_fops = {
         .llseek = default_llseek,
 };
 
-static struct dentry *soc_debugfs_create_dir(struct dentry *parent,
-        const char *fmt, ...)
+static void soc_init_component_debugfs(struct snd_soc_component *component)
 {
-        struct dentry *de;
-        va_list ap;
-        char *s;
+        if (component->debugfs_prefix) {
+                char *name;
 
-        va_start(ap, fmt);
-        s = kvasprintf(GFP_KERNEL, fmt, ap);
-        va_end(ap);
+                name = kasprintf(GFP_KERNEL, "%s:%s",
+                        component->debugfs_prefix, component->name);
+                if (name) {
+                        component->debugfs_root = debugfs_create_dir(name,
+                                component->card->debugfs_card_root);
+                        kfree(name);
+                }
+        } else {
+                component->debugfs_root = debugfs_create_dir(component->name,
+                                component->card->debugfs_card_root);
+        }
 
-        if (!s)
-                return NULL;
+        if (!component->debugfs_root) {
+                dev_warn(component->dev,
+                        "ASoC: Failed to create component debugfs directory\n");
+                return;
+        }
 
-        de = debugfs_create_dir(s, parent);
-        kfree(s);
+        snd_soc_dapm_debugfs_init(snd_soc_component_get_dapm(component),
+                component->debugfs_root);
 
-        return de;
+        if (component->init_debugfs)
+                component->init_debugfs(component);
 }
 
-static void soc_init_codec_debugfs(struct snd_soc_codec *codec)
+static void soc_cleanup_component_debugfs(struct snd_soc_component *component)
 {
-        struct dentry *debugfs_card_root = codec->component.card->debugfs_card_root;
+        debugfs_remove_recursive(component->debugfs_root);
+}
 
-        codec->debugfs_codec_root = soc_debugfs_create_dir(debugfs_card_root,
-                                                "codec:%s",
-                                                codec->component.name);
-        if (!codec->debugfs_codec_root) {
-                dev_warn(codec->dev,
-                        "ASoC: Failed to create codec debugfs directory\n");
-                return;
-        }
+static void soc_init_codec_debugfs(struct snd_soc_component *component)
+{
+        struct snd_soc_codec *codec = snd_soc_component_to_codec(component);
 
-        debugfs_create_bool("cache_sync", 0444, codec->debugfs_codec_root,
+        debugfs_create_bool("cache_sync", 0444, codec->component.debugfs_root,
                             &codec->cache_sync);
-        debugfs_create_bool("cache_only", 0444, codec->debugfs_codec_root,
+        debugfs_create_bool("cache_only", 0444, codec->component.debugfs_root,
                             &codec->cache_only);
 
         codec->debugfs_reg = debugfs_create_file("codec_reg", 0644,
-                                                 codec->debugfs_codec_root,
+                                                 codec->component.debugfs_root,
                                                  codec, &codec_reg_fops);
         if (!codec->debugfs_reg)
                 dev_warn(codec->dev,
                         "ASoC: Failed to create codec register debugfs file\n");
-
-        snd_soc_dapm_debugfs_init(&codec->dapm, codec->debugfs_codec_root);
-}
-
-static void soc_cleanup_codec_debugfs(struct snd_soc_codec *codec)
-{
-        debugfs_remove_recursive(codec->debugfs_codec_root);
-}
-
-static void soc_init_platform_debugfs(struct snd_soc_platform *platform)
-{
-        struct dentry *debugfs_card_root = platform->component.card->debugfs_card_root;
-
-        platform->debugfs_platform_root = soc_debugfs_create_dir(debugfs_card_root,
-                                                "platform:%s",
-                                                platform->component.name);
-        if (!platform->debugfs_platform_root) {
-                dev_warn(platform->dev,
-                        "ASoC: Failed to create platform debugfs directory\n");
-                return;
-        }
-
-        snd_soc_dapm_debugfs_init(&platform->component.dapm,
-                platform->debugfs_platform_root);
-}
-
-static void soc_cleanup_platform_debugfs(struct snd_soc_platform *platform)
-{
-        debugfs_remove_recursive(platform->debugfs_platform_root);
 }
 
 static ssize_t codec_list_read_file(struct file *file, char __user *user_buf,
@@ -474,19 +451,15 @@ static void soc_cleanup_card_debugfs(struct snd_soc_card *card)
 
 #else
 
-static inline void soc_init_codec_debugfs(struct snd_soc_codec *codec)
-{
-}
+#define soc_init_codec_debugfs NULL
 
-static inline void soc_cleanup_codec_debugfs(struct snd_soc_codec *codec)
+static inline void soc_init_component_debugfs(
+        struct snd_soc_component *component)
 {
 }
 
-static inline void soc_init_platform_debugfs(struct snd_soc_platform *platform)
-{
-}
-
-static inline void soc_cleanup_platform_debugfs(struct snd_soc_platform *platform)
+static inline void soc_cleanup_component_debugfs(
+        struct snd_soc_component *component)
 {
 }
 
@@ -1026,7 +999,7 @@ static int soc_remove_platform(struct snd_soc_platform *platform)
         /* Make sure all DAPM widgets are freed */
         snd_soc_dapm_free(&platform->component.dapm);
 
-        soc_cleanup_platform_debugfs(platform);
+        soc_cleanup_component_debugfs(&platform->component);
         platform->probed = 0;
         module_put(platform->dev->driver->owner);
 
@@ -1046,7 +1019,7 @@ static void soc_remove_codec(struct snd_soc_codec *codec)
         /* Make sure all DAPM widgets are freed */
         snd_soc_dapm_free(&codec->dapm);
 
-        soc_cleanup_codec_debugfs(codec);
+        soc_cleanup_component_debugfs(&codec->component);
         codec->probed = 0;
         list_del(&codec->card_list);
         module_put(codec->dev->driver->owner);
@@ -1187,7 +1160,7 @@ static int soc_probe_codec(struct snd_soc_card *card,
         if (!try_module_get(codec->dev->driver->owner))
                 return -ENODEV;
 
-        soc_init_codec_debugfs(codec);
+        soc_init_component_debugfs(&codec->component);
 
         if (driver->dapm_widgets) {
                 ret = snd_soc_dapm_new_controls(&codec->dapm,
@@ -1242,7 +1215,7 @@ static int soc_probe_codec(struct snd_soc_card *card,
         return 0;
 
 err_probe:
-        soc_cleanup_codec_debugfs(codec);
+        soc_cleanup_component_debugfs(&codec->component);
         module_put(codec->dev->driver->owner);
 
         return ret;
@@ -1262,7 +1235,7 @@ static int soc_probe_platform(struct snd_soc_card *card,
         if (!try_module_get(platform->dev->driver->owner))
                 return -ENODEV;
 
-        soc_init_platform_debugfs(platform);
+        soc_init_component_debugfs(&platform->component);
 
         if (driver->dapm_widgets)
                 snd_soc_dapm_new_controls(&platform->component.dapm,
@@ -1302,7 +1275,7 @@ static int soc_probe_platform(struct snd_soc_card *card,
         return 0;
 
 err_probe:
-        soc_cleanup_platform_debugfs(platform);
+        soc_cleanup_component_debugfs(&platform->component);
         module_put(platform->dev->driver->owner);
 
         return ret;
@@ -4266,6 +4239,10 @@ int snd_soc_add_platform(struct device *dev, struct snd_soc_platform *platform,
         if (platform_drv->read)
                 platform->component.read = snd_soc_platform_drv_read;
 
+#ifdef CONFIG_DEBUG_FS
+        platform->component.debugfs_prefix = "platform";
+#endif
+
         mutex_lock(&client_mutex);
         snd_soc_component_add_unlocked(&platform->component);
         list_add(&platform->list, &platform_list);
@@ -4455,6 +4432,11 @@ int snd_soc_register_codec(struct device *dev,
         codec->component.val_bytes = codec_drv->reg_word_size;
         mutex_init(&codec->mutex);
 
+#ifdef CONFIG_DEBUG_FS
+        codec->component.init_debugfs = soc_init_codec_debugfs;
+        codec->component.debugfs_prefix = "codec";
+#endif
+
         if (!codec->component.write) {
                 if (codec_drv->get_regmap)
                         regmap = codec_drv->get_regmap(dev);