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>

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 81c4052c127ccc150a63ca50780ddcc9357f25f7..05da8a8f0aef8f7bc66f77a57e74d5931764adf5 100644 (file)
--- 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;