[PATCH BlueZ v4 3/7] battery: Add Source property to Battery API

[Sonny Sasaka <sonnysasaka@xxxxxxxxxxxx>]

As Battery API will be generalized for other battery reporting
protocols, the Source property is useful for diagnostics purposes.

Reviewed-by: Miao-chen Chou <mcchou@xxxxxxxxxxxx>

---
 profiles/battery/battery.c |  3 ++-
 src/battery.c              | 35 +++++++++++++++++++++++++++++++----
 src/battery.h              |  2 +-
 3 files changed, 34 insertions(+), 6 deletions(-)

diff --git a/profiles/battery/battery.c b/profiles/battery/battery.c
index e1a61dd0b..2478816a4 100644
--- a/profiles/battery/battery.c
+++ b/profiles/battery/battery.c
@@ -126,7 +126,8 @@ static void batt_io_ccc_written_cb(uint16_t att_ecode, void *user_data)
 		return;
 	}
 
-	batt->battery = btd_battery_register(device_get_path(batt->device));
+	batt->battery = btd_battery_register(device_get_path(batt->device),
+					     "GATT Battery Service");
 
 	if (!batt->battery) {
 		batt_reset(batt);
diff --git a/src/battery.c b/src/battery.c
index 87a6b91fb..8613d6e23 100644
--- a/src/battery.c
+++ b/src/battery.c
@@ -31,8 +31,9 @@
 #define BATTERY_MAX_PERCENTAGE 100
 
 struct btd_battery {
-	char *path; /* D-Bus object path, owns pointer */
+	char *path; /* D-Bus object path */
 	uint8_t percentage; /* valid between 0 to 100 inclusively */
+	char *source; /* Descriptive source of the battery info */
 };
 
 static struct queue *batteries = NULL;
@@ -62,13 +63,15 @@ static bool match_path(const void *data, const void *user_data)
 	return g_strcmp0(battery->path, path) == 0;
 }
 
-static struct btd_battery *battery_new(const char *path)
+static struct btd_battery *battery_new(const char *path, const char *source)
 {
 	struct btd_battery *battery;
 
 	battery = new0(struct btd_battery, 1);
 	battery->path = g_strdup(path);
 	battery->percentage = UINT8_MAX;
+	if (source)
+		battery->source = g_strdup(source);
 
 	return battery;
 }
@@ -78,6 +81,9 @@ static void battery_free(struct btd_battery *battery)
 	if (battery->path)
 		g_free(battery->path);
 
+	if (battery->source)
+		g_free(battery->source);
+
 	free(battery);
 }
 
@@ -100,13 +106,34 @@ static gboolean property_percentage_exists(const GDBusPropertyTable *property,
 	return battery->percentage <= BATTERY_MAX_PERCENTAGE;
 }
 
+static gboolean property_source_get(const GDBusPropertyTable *property,
+				    DBusMessageIter *iter, void *data)
+{
+	struct btd_battery *battery = data;
+
+	dbus_message_iter_append_basic(iter, DBUS_TYPE_STRING,
+				       &battery->source);
+
+	return TRUE;
+}
+
+static gboolean property_source_exists(const GDBusPropertyTable *property,
+				       void *data)
+{
+	struct btd_battery *battery = data;
+
+	return battery->source != NULL;
+}
+
 static const GDBusPropertyTable battery_properties[] = {
 	{ "Percentage", "y", property_percentage_get, NULL,
 	  property_percentage_exists },
+	{ "Source", "s", property_source_get, NULL, property_source_exists,
+	  G_DBUS_PROPERTY_FLAG_EXPERIMENTAL },
 	{}
 };
 
-struct btd_battery *btd_battery_register(const char *path)
+struct btd_battery *btd_battery_register(const char *path, const char *source)
 {
 	struct btd_battery *battery;
 
@@ -122,7 +149,7 @@ struct btd_battery *btd_battery_register(const char *path)
 		return NULL;
 	}
 
-	battery = battery_new(path);
+	battery = battery_new(path, source);
 	battery_add(battery);
 
 	if (!g_dbus_register_interface(btd_get_dbus_connection(), battery->path,
diff --git a/src/battery.h b/src/battery.h
index 9c69b7afa..ff63454cd 100644
--- a/src/battery.h
+++ b/src/battery.h
@@ -10,6 +10,6 @@
 
 struct btd_battery;
 
-struct btd_battery *btd_battery_register(const char *path);
+struct btd_battery *btd_battery_register(const char *path, const char *source);
 bool btd_battery_unregister(struct btd_battery *battery);
 bool btd_battery_update(struct btd_battery *battery, uint8_t percentage);
-- 
2.26.2