binding: gps: add dop reporting

Add dilution of precision report to JSON output to allow
subscribers to judge if the 3D fix lock is good enough.
If not user should fall back to the geoclue binding support.

Bug-AGL: SPEC-844
Change-Id: If5a520d23c8b455583a022ab07a02dea03185705
Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/binding/afm-gps-binding.c b/binding/afm-gps-binding.c
index e7cbf8f..e00a317 100644
--- a/binding/afm-gps-binding.c
+++ b/binding/afm-gps-binding.c
@@ -36,6 +36,37 @@ static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
 
 #define MSECS_TO_USECS(x) (x * 1000)
 
+// struct dop_t item order
+static const char *dop_names[] = {
+	"xdop",
+	"ydop",
+	"pdop",
+	"hdop",
+	"vdop",
+	"tdop",
+	"gdop",
+	NULL
+};
+
+static json_object *populate_json_dop_data(json_object *jresp, struct dop_t *dop)
+{
+	char **names = (char **) dop_names;
+	double *tmp = (double *) dop;
+	json_object *value = NULL;
+
+	while (*names) {
+		double val = *tmp++;
+
+		if (val != 0) {
+			value = json_object_new_double(val);
+			json_object_object_add(jresp, *names, value);
+		}
+		names++;
+	}
+
+	return jresp;
+}
+
 static json_object *populate_json_data(json_object *jresp)
 {
 	json_object *value = NULL;
@@ -63,6 +94,8 @@ static json_object *populate_json_data(json_object *jresp)
 		json_object_object_add(jresp, "speed", value);
 	}
 
+	jresp = populate_json_dop_data(jresp, &data.dop);
+
 	return jresp;
 }