ASoC: core: add platform DAPM debugfs support

Allow platform widgets to be visible in debugfs like codec widgets.
Signed-off-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

include/sound/soc.h

@@ -706,6 +706,11 @@ struct snd_soc_platform {
 	struct list_head card_list;
 
 	struct snd_soc_dapm_context dapm;
+
+#ifdef CONFIG_DEBUG_FS
+	struct dentry *debugfs_platform_root;
+	struct dentry *debugfs_dapm;
+#endif
 };
 
 struct snd_soc_dai_link {

sound/soc/soc-core.c

@@ -300,6 +300,27 @@ 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->card->debugfs_card_root;
+
+	platform->debugfs_platform_root = debugfs_create_dir(platform->name,
+						       debugfs_card_root);
+	if (!platform->debugfs_platform_root) {
+		dev_warn(platform->dev,
+			"Failed to create platform debugfs directory\n");
+		return;
+	}
+
+	snd_soc_dapm_debugfs_init(&platform->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,
 				    size_t count, loff_t *ppos)
 {
@@ -433,6 +454,14 @@ static inline void soc_cleanup_codec_debugfs(struct snd_soc_codec *codec)
 {
 }
 
+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_init_card_debugfs(struct snd_soc_card *card)
 {
 }
@@ -920,6 +949,7 @@ static void soc_remove_dai_link(struct snd_soc_card *card, int num, int order)
 		/* Make sure all DAPM widgets are freed */
 		snd_soc_dapm_free(&platform->dapm);
 
+		soc_cleanup_platform_debugfs(platform);
 		platform->probed = 0;
 		list_del(&platform->card_list);
 		module_put(platform->dev->driver->owner);
@@ -1037,6 +1067,8 @@ 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);
+
 	if (driver->dapm_widgets)
 		snd_soc_dapm_new_controls(&platform->dapm,
 			driver->dapm_widgets, driver->num_dapm_widgets);