[PATCH i-g-t v2 22/39] lib/chamelium/v3: Implement Chamelium configuration parsing

[Louis Chauvet]

The mapping between DRM connectors and Chamelium ports can differ among
setups. To avoid using a time-consuming algorithm for auto-detecting the
configuration, this commit introduces parsing of the port mapping from a
configuration file. The format used is the same as in Chamelium v2.

Signed-off-by: Louis Chauvet <louis.chauvet at bootlin.com>
---
 lib/chamelium/v3/igt_chamelium.c | 72 ++++++++++++++++++++++++++++++++++++++++
 lib/chamelium/v3/igt_chamelium.h |  2 ++
 2 files changed, 74 insertions(+)

diff --git a/lib/chamelium/v3/igt_chamelium.c b/lib/chamelium/v3/igt_chamelium.c
index 767dfcfcb182..e5a6a438924d 100644
--- a/lib/chamelium/v3/igt_chamelium.c
+++ b/lib/chamelium/v3/igt_chamelium.c
@@ -10,6 +10,9 @@
 #define CHAMELIUM_CONFIG_SECTION "Chameliumv3"
 #define CHAMELIUM_CONFIG_URL "URL"
 
+#define CHAMELIUM_V2_CONFIG_PREFIX "Chamelium"
+#define CHAMELIUM_V2_CONFIG_PORT_ID "ChameliumPortID"
+
 struct igt_chamelium_v3 {
 	xmlrpc_env env;
 	xmlrpc_client *client;
@@ -126,6 +129,75 @@ struct igt_chamelium_v3 *chamelium_v3_init_from_config(void)
 	return chamelium;
 }
 
+/**
+ * chamelium_v3_fill_port_mapping_from_config_v2() - Read the configuration file using the chamelium
+ *	v2 format
+ *
+ * @chamelium: chamelium to store the port mapping into
+ *
+ * Read the configuration file to search a chamelium configuration, using the Cv2 format. It will
+ * ignore any malformed entry.
+ */
+static void chamelium_v3_fill_port_mapping_from_config_v2(struct igt_chamelium_v3 *chamelium)
+{
+	char **group_list;
+
+	igt_assert(igt_key_file);
+
+	group_list = g_key_file_get_groups(igt_key_file, NULL);
+	for (int group_idx = 0; group_list[group_idx]; group_idx++) {
+		if (strstr(group_list[group_idx], CHAMELIUM_V2_CONFIG_PREFIX ":")) {
+			struct chamelium_v3_port_mapping *port_mapping = NULL;
+			GError *error = NULL;
+			char *port_name_str =
+			    group_list[group_idx] + (sizeof(CHAMELIUM_V2_CONFIG_PREFIX ":") - 1);
+
+			errno = 0;
+
+			port_mapping = chamelium_v3_port_mapping_alloc();
+			port_mapping->connector_name = strdup(port_name_str);
+
+			if (g_key_file_has_key(igt_key_file, group_list[group_idx],
+					       CHAMELIUM_V2_CONFIG_PORT_ID, NULL)) {
+				port_mapping->port_id = g_key_file_get_integer(igt_key_file,
+									       group_list[group_idx],
+									       CHAMELIUM_V2_CONFIG_PORT_ID,
+									       &error);
+				if (error) {
+					igt_info("Skipping malformed entry %s: %s\n",
+						 group_list[group_idx], error->message);
+					chamelium_v3_port_mapping_free(port_mapping);
+				} else {
+					igt_list_add(&port_mapping->link, &chamelium->port_mapping);
+				}
+			} else {
+				igt_warn("Skipping malformed entry %s: Missing "
+					 CHAMELIUM_V2_CONFIG_PORT_ID "\n",
+					 group_list[group_idx]);
+				chamelium_v3_port_mapping_free(port_mapping);
+			}
+
+			if (error)
+				free(error);
+		}
+
+		free(group_list[group_idx]);
+	}
+	free(group_list);
+}
+
+/**
+ * chamelium_v3_fill_port_mapping() - Read the configuration file and fill the port_mapping
+ *	structure.
+ *
+ * @chamelium: chamelium to store the port mapping into
+ */
+void chamelium_v3_fill_port_mapping(struct igt_chamelium_v3 *chamelium)
+{
+	if (igt_key_file)
+		chamelium_v3_fill_port_mapping_from_config_v2(chamelium);
+}
+
 /**
  * chamelium_v3_uninit() - Free the resources used by a chamelium
  *
diff --git a/lib/chamelium/v3/igt_chamelium.h b/lib/chamelium/v3/igt_chamelium.h
index cab33e43aadd..3aaf51dd38db 100644
--- a/lib/chamelium/v3/igt_chamelium.h
+++ b/lib/chamelium/v3/igt_chamelium.h
@@ -44,6 +44,8 @@ struct chamelium_v3_port_mapping {
 struct igt_chamelium_v3 *chamelium_v3_init(char *url);
 struct igt_chamelium_v3 *chamelium_v3_init_from_config(void);
 
+void chamelium_v3_fill_port_mapping(struct igt_chamelium_v3 *chamelium);
+
 void chamelium_v3_uninit(struct igt_chamelium_v3 *chamelium);
 
 void chamelium_v3_reset(struct igt_chamelium_v3 *chamelium);

-- 
2.44.2