ucm: add ValueDefaults section to the master file

- the get_value() function is recoded (tries to find the value in
  parent's list)

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

src/ucm/main.c

@@ -445,6 +445,7 @@ int snd_use_case_mgr_open(snd_use_case_mgr_t **mgr,
 		return -ENOMEM;
 	INIT_LIST_HEAD(&uc_mgr->verb_list);
 	INIT_LIST_HEAD(&uc_mgr->default_list);
+	INIT_LIST_HEAD(&uc_mgr->value_list);
 	pthread_mutex_init(&uc_mgr->mutex, NULL);
 
 	uc_mgr->card_name = strdup(card_name);
@@ -688,6 +689,9 @@ static int get_value_list(snd_use_case_mgr_t *uc_mgr,
         if (verb == NULL)
                 return -ENOENT;
         INIT_LIST_HEAD(&mylist);
+	err = add_values(&mylist, identifier, &uc_mgr->value_list);
+	if (err < 0)
+		goto __fail;
         err = add_values(&mylist, identifier, &verb->value_list);
         if (err < 0)
                 goto __fail;
@@ -821,14 +825,16 @@ static int get_value1(const char **value, struct list_head *value_list,
                       return 0;
               }
         }
-        return 0;
+        return -ENOENT;
 }
 
 /**
  * \brief Get value
- * \param list Returned list
- * \param verbname For verb (NULL = current)
- * \return Number of list entries if success, otherwise a negative error code
+ * \param uc_mgr Use case manager
+ * \param identifier Value identifier (string)
+ * \param value Returned value string
+ * \param modifier modifier name (string)
+ * \return Zero on success (value is filled), otherwise a negative error code
  */
 static int get_value(snd_use_case_mgr_t *uc_mgr,
                      const char *identifier,
@@ -836,16 +842,23 @@ static int get_value(snd_use_case_mgr_t *uc_mgr,
                      const char *modifier)
 {
         struct use_case_modifier *mod;
+	int err;
 
-        if (uc_mgr->active_verb == NULL)
-                return -ENOENT;
-        if (modifier == NULL)
-                return get_value1(value, &uc_mgr->active_verb->value_list,
-                                  identifier);
+	if (modifier != NULL) {
 	        mod = find_modifier(uc_mgr->active_verb, modifier);
-        if (mod == NULL)
-                return -EINVAL;
-        return get_value1(value, &mod->value_list, identifier);
+		if (mod != NULL) {
+			err = get_value1(value, &mod->value_list, identifier);
+			if (err >= 0 || err != -ENOENT)
+				return err;
+		}
+	}
+	err = get_value1(value, &uc_mgr->active_verb->value_list, identifier);
+	if (err >= 0 || err != -ENOENT)
+		return err;
+	err = get_value1(value, &uc_mgr->value_list, identifier);
+	if (err >= 0 || err != -ENOENT)
+		return err;
+	return -ENOENT;
 }
 
 /**

src/ucm/parser.c

@@ -939,6 +939,13 @@ static int parse_controls(snd_use_case_mgr_t *uc_mgr, snd_config_t *cfg)
  *	Comment "Play and record HiFi quality Music."
  * }
  *
+ * # Define Value defaults
+ *
+ * ValueDefaults {
+ *	PlaybackCTL "hw:CARD=0,DEV=0"
+ *	CaptureCTL "hw:CARD=0,DEV=0"
+ * }
+ *
  * # This file also stores the default sound card state.
  *
  * SectionDefaults [
@@ -999,6 +1006,17 @@ static int parse_master_file(snd_use_case_mgr_t *uc_mgr, snd_config_t *cfg)
 				return err;
 			continue;
 		}
+
+		/* get the default values */
+		if (strcmp(id, "ValueDefaults") == 0) {
+			err = parse_value(uc_mgr, &uc_mgr->value_list, n);
+			if (err < 0) {
+				uc_error("error: failed to parse ValueDefaults");
+				return err;
+			}
+			continue;
+		}
+
 		uc_error("uknown master file field %s", id);
 	}
 	return 0;

src/ucm/ucm_local.h

@@ -173,6 +173,9 @@ struct snd_use_case_mgr {
 	/* default settings - sequence */
 	struct list_head default_list;
 
+	/* default settings - value list */
+	struct list_head value_list;
+
 	/* current status */
 	struct use_case_verb *active_verb;
 	struct list_head active_devices;

src/ucm/utils.c

@@ -214,6 +214,7 @@ void uc_mgr_free_verb(snd_use_case_mgr_t *uc_mgr)
 		free(verb);
 	}
 	uc_mgr_free_sequence(&uc_mgr->default_list);
+	uc_mgr_free_value(&uc_mgr->value_list);
 	free(uc_mgr->comment);
 	uc_mgr->comment = NULL;
 	uc_mgr->active_verb = NULL;