ASoC: Add bias level data to DAPM context debugfs

This is also in the old sysfs diagnostics but it's nice to have everything
in one place.

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

1 files changed, 48 insertions, 0 deletions

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 81c4052c127c..05da8a8f0aef 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -1304,6 +1304,47 @@ static const struct file_operations dapm_widget_power_fops = {
         .llseek = default_llseek,
 };
 
+static int dapm_bias_open_file(struct inode *inode, struct file *file)
+{
+        file->private_data = inode->i_private;
+        return 0;
+}
+
+static ssize_t dapm_bias_read_file(struct file *file, char __user *user_buf,
+                                   size_t count, loff_t *ppos)
+{
+        struct snd_soc_dapm_context *dapm = file->private_data;
+        char *level;
+
+        switch (dapm->bias_level) {
+        case SND_SOC_BIAS_ON:
+                level = "On\n";
+                break;
+        case SND_SOC_BIAS_PREPARE:
+                level = "Prepare\n";
+                break;
+        case SND_SOC_BIAS_STANDBY:
+                level = "Standby\n";
+                break;
+        case SND_SOC_BIAS_OFF:
+                level = "Off\n";
+                break;
+        default:
+                BUG();
+                level = "Unknown\n";
+                break;
+        }
+
+        return simple_read_from_buffer(user_buf, count, ppos, level,
+                                       strlen(level));
+}
+
+static const struct file_operations dapm_bias_fops = {
+        .open = dapm_bias_open_file,
+        .read = dapm_bias_read_file,
+        .llseek = default_llseek,
+};
+
 void snd_soc_dapm_debugfs_init(struct snd_soc_dapm_context *dapm)
 {
         struct snd_soc_dapm_widget *w;
@@ -1312,6 +1353,13 @@ void snd_soc_dapm_debugfs_init(struct snd_soc_dapm_context *dapm)
         if (!dapm->debugfs_dapm)
                 return;
 
+        d = debugfs_create_file("bias_level", 0444,
+                                dapm->debugfs_dapm, dapm,
+                                &dapm_bias_fops);
+        if (!d)
+                dev_warn(dapm->dev,
+                         "ASoC: Failed to create bias level debugfs file\n");
+
         list_for_each_entry(w, &dapm->card->widgets, list) {
                 if (!w->name || w->dapm != dapm)
                         continue;