ucm: Handle 'Error' keyword in the master file

With the conditional blocks, it may be useful to terminate
the hardware detection from the configuration. Introduce
'Error' keyword for the master UCM configuration file.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>

diff --git a/src/ucm/parser.c b/src/ucm/parser.c
index d034b8598a8513ab5918c66db5cf317091170273..e57e208a838609177785c1f70a52641fc8a836e4 100644 (file)
--- a/src/ucm/parser.c
+++ b/src/ucm/parser.c
@@ -244,6 +244,24 @@ int parse_get_safe_name(snd_use_case_mgr_t *uc_mgr, snd_config_t *n,
        return 0;
 }
 
+/*
+ * Handle 'Error' configuration node.
+ */
+static int error_node(snd_use_case_mgr_t *uc_mgr, snd_config_t *cfg)
+{
+       int err;
+       char *s;
+
+       err = parse_string_substitute3(uc_mgr, cfg, &s);
+       if (err < 0) {
+               uc_error("error: failed to get Error string");
+               return err;
+       }
+       uc_error("%s", s);
+       free(s);
+       return -ENXIO;
+}
+
 /*
  * Evaluate variable regex definitions (in-place delete)
  */
@@ -1899,6 +1917,10 @@ static int parse_master_file(snd_use_case_mgr_t *uc_mgr, snd_config_t *cfg)
                        continue;
                }
 
+               /* error */
+               if (strcmp(id, "Error") == 0)
+                       return error_node(uc_mgr, n);
+
                uc_error("uknown master file field %s", id);
        }
        return 0;