ASoC: Add DAPM widget power decision debugfs files

Currently when built with DEBUG DAPM will dump information about
the power state decisions it is taking for each widget to dmesg.
This isn't an ideal way of getting the information - it requires
a kernel build to turn it on and off and for large hub CODECs the
volume of information is so large as to be illegible. When the
output goes to the console it can also cause a noticable impact
on performance simply to print it out.

Improve the situation by adding a dapm directory to our debugfs
tree containing a file per widget with the same information in
it. This still requires a decision to build with debugfs support
but is easier to navigate and much less intrusive.

In addition to the previously displayed information active streams
are also shown in these files.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index e984a17cd65..7ff04ad2a97 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1267,10 +1267,18 @@ static void soc_init_codec_debugfs(struct snd_soc_codec *codec)
         if (!codec->debugfs_pop_time)
                 printk(KERN_WARNING
                        "Failed to create pop time debugfs file\n");
+
+        codec->debugfs_dapm = debugfs_create_dir("dapm", debugfs_root);
+        if (!codec->debugfs_dapm)
+                printk(KERN_WARNING
+                       "Failed to create DAPM debugfs directory\n");
+
+        snd_soc_dapm_debugfs_init(codec);
 }
 
 static void soc_cleanup_codec_debugfs(struct snd_soc_codec *codec)
 {
+        debugfs_remove_recursive(codec->debugfs_dapm);
         debugfs_remove(codec->debugfs_pop_time);
         debugfs_remove(codec->debugfs_reg);
 }