ASoC: SOF: sof-client-probes: Add module parameter to enable probes support

Keep the probes support disabled by default and require module parameter to
enable it explicitly as the probes usage is meant for developers only.

This will avoid confusing users with the existence of a probes card with
a compressed capture.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>

Author: ujfalusi

sound/soc/sof/sof-client-probes.c

@@ -23,6 +23,10 @@
 
 #define SOF_PROBES_INVALID_NODE_ID UINT_MAX
 
+static bool __read_mostly sof_probes_enabled;
+module_param_named(enable, sof_probes_enabled, bool, 0444);
+MODULE_PARM_DESC(enable, "Enable SOF probes support");
+
 struct sof_probes_priv {
 	struct dentry *dfs_points;
 	struct dentry *dfs_points_remove;
@@ -674,6 +678,10 @@ static int sof_probes_client_probe(struct auxiliary_device *auxdev,
 	struct snd_soc_dai_link *links;
 	int ret;
 
+	/* do not set up the probes support if it is not enabled */
+	if (!sof_probes_enabled)
+		return -ENXIO;
+
 	if (!dev->platform_data) {
 		dev_err(dev, "error: missing platform data\n");
 		return -ENODEV;
@@ -771,6 +779,9 @@ static void sof_probes_client_remove(struct auxiliary_device *auxdev)
 	struct sof_client_dev *cdev = auxiliary_dev_to_sof_client_dev(auxdev);
 	struct sof_probes_priv *priv = cdev->data;
 
+	if (!sof_probes_enabled)
+		return;
+
 	pm_runtime_disable(&auxdev->dev);
 	debugfs_remove(priv->dfs_points);
 	debugfs_remove(priv->dfs_points_remove);