+ return ret;
+}
+
+/**
+ * List all possible values for a configuration key.
+ *
+ * @param driver The sr_dev_driver struct to query.
+ * @param key The configuration key (SR_CONF_*).
+ * @param data A pointer to a GVariant where the list will be stored. The
+ * caller is given ownership of the GVariant and must thus
+ * unref the GVariant after use. However if this function
+ * returns an error code, the field should be considered
+ * unused, and should not be unreferenced.
+ * @param sdi (optional) If the key is specific to a device, this must
+ * contain a pointer to the struct sr_dev_inst to be checked.
+ *
+ * @return SR_OK upon success or SR_ERR in case of error. Note SR_ERR_ARG
+ * may be returned by the driver indicating it doesn't know that key,
+ * but this is not to be flagged as an error by the caller; merely
+ * as an indication that it's not applicable.
+ */
+SR_API int sr_config_list(const struct sr_dev_driver *driver, int key,
+ GVariant **data, const struct sr_dev_inst *sdi)
+{
+ int ret;
+
+ if (!driver || !data)
+ ret = SR_ERR;
+ else if (!driver->config_list)
+ ret = SR_ERR_ARG;
+ else if ((ret = driver->config_list(key, data, sdi)) == SR_OK)
+ g_variant_ref_sink(*data);
+
+ return ret;