[PATCH v3 7/9] Battery: Read Battery level characteristic

[<chen.ganir@xxxxxx>]

From: Chen Ganir <chen.ganir@xxxxxx>

Add support for reading the battery level characteristic on
connection establishment.
---
 profiles/battery/battery.c |   45 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/profiles/battery/battery.c b/profiles/battery/battery.c
index 2f616e0..467922b 100644
--- a/profiles/battery/battery.c
+++ b/profiles/battery/battery.c
@@ -62,6 +62,7 @@ struct characteristic {
 	GSList				*desc;	/* Descriptors */
 	uint8_t			ns;		/* Battery Namespace */
 	uint16_t		description;	/* Battery description */
+	uint8_t        level;
 };
 
 struct descriptor {
@@ -123,6 +124,40 @@ static void battery_free(gpointer user_data)
 	g_free(batt);
 }
 
+static void read_batterylevel_cb(guint8 status, const guint8 *pdu, guint16 len,
+							gpointer user_data)
+{
+	struct characteristic *ch = user_data;
+	uint8_t value[ATT_MAX_MTU];
+	int vlen;
+
+	if (status != 0) {
+		error("Failed to read Battery Level:%s", att_ecode2str(status));
+		return;
+	}
+
+	vlen = dec_read_resp(pdu, len, value, sizeof(value));
+	if (!vlen) {
+		error("Failed to read Battery Level: Protocol error\n");
+		return;
+	}
+
+	if (vlen < 1) {
+		error("Failed to read Battery Level: Wrong pdu len");
+		return;
+	}
+
+	ch->level = value[0];
+}
+
+static void process_batteryservice_char(struct characteristic *ch)
+{
+	if (g_strcmp0(ch->attr.uuid, BATTERY_LEVEL_UUID) == 0) {
+		gatt_read_char(ch->batt->attrib, ch->attr.value_handle, 0,
+						read_batterylevel_cb, ch);
+	}
+}
+
 static void batterylevel_presentation_format_desc_cb(guint8 status,
 						const guint8 *pdu, guint16 len,
 						gpointer user_data)
@@ -195,6 +230,8 @@ static DBusMessage *get_properties(DBusConnection *conn, DBusMessage *msg,
 	dict_append_entry(&dict, "Description", DBUS_TYPE_UINT16,
 							&c->description);
 
+	dict_append_entry(&dict, "Level", DBUS_TYPE_BYTE, &c->level);
+
 	dbus_message_iter_close_container(&iter, &dict);
 
 	return reply;
@@ -260,6 +297,8 @@ update_char:
 	} else {
 		device_add_battery(ch->batt->dev, ch->path);
 	}
+
+	process_batteryservice_char(ch);
 }
 
 static void configure_battery_cb(GSList *characteristics, guint8 status,
@@ -319,6 +358,12 @@ static void attio_connected_cb(GAttrib *attrib, gpointer user_data)
 		gatt_discover_char(batt->attrib, batt->svc_range->start,
 					batt->svc_range->end, NULL,
 					configure_battery_cb, batt);
+	} else {
+		GSList *l;
+		for (l = batt->chars; l; l = l->next) {
+			struct characteristic *c = l->data;
+			process_batteryservice_char(c);
+		}
 	}
 }
 
-- 
1.7.9.5

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