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/* vim: set et ts=8 sw=8: */
/*
* Copyright 2014 Red Hat, Inc.
*
* Geoclue is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* Geoclue is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along
* with Geoclue; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Zeeshan Ali (Khattak) <zeeshanak@gnome.org>
*/
#include <glib.h>
#include "gclue-compass.h"
#include "gclue-location.h"
#include "compass-interface.h"
/**
* SECTION:gclue-compass
* @short_description: IIO compass support
* @include: gclue-glib/gclue-compass.h
**/
struct _GClueCompassPrivate
{
Compass *proxy;
GCancellable *cancellable;
};
G_DEFINE_TYPE_WITH_CODE (GClueCompass,
gclue_compass,
G_TYPE_OBJECT,
G_ADD_PRIVATE (GClueCompass))
enum
{
PROP_0,
PROP_HEADING,
LAST_PROP
};
static GParamSpec *gParamSpecs[LAST_PROP];
static void
gclue_compass_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GClueCompass *compass = GCLUE_COMPASS (object);
switch (prop_id) {
case PROP_HEADING:
g_value_set_double (value,
gclue_compass_get_heading (compass));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
gclue_compass_finalize (GObject *object)
{
GClueCompassPrivate *priv = GCLUE_COMPASS (object)->priv;
g_cancellable_cancel (priv->cancellable);
g_clear_object (&priv->cancellable);
if (priv->proxy != NULL) {
GError *error = NULL;
if (!compass_call_release_compass_sync (priv->proxy,
NULL,
&error)) {
g_warning ("Failed to release compass: %s",
error->message);
g_error_free (error);
}
g_debug ("IIO compass released");
g_object_unref (priv->proxy);
}
G_OBJECT_CLASS (gclue_compass_parent_class)->finalize (object);
}
static void
gclue_compass_class_init (GClueCompassClass *klass)
{
GObjectClass *object_class;
object_class = G_OBJECT_CLASS (klass);
object_class->get_property = gclue_compass_get_property;
object_class->finalize = gclue_compass_finalize;
/**
* GClueCompass:heading
*
* The positive angle between the direction of movement and the North
* direction, in clockwise direction. The angle is measured in degrees.
*/
gParamSpecs[PROP_HEADING] =
g_param_spec_double ("heading",
"Heading",
"The positive angle between the direction"
" of movement and the North direction, in"
" clockwise direction. The angle is "
"measured in degrees.",
GCLUE_LOCATION_HEADING_UNKNOWN,
G_MAXDOUBLE,
GCLUE_LOCATION_HEADING_UNKNOWN,
G_PARAM_READABLE |
G_PARAM_STATIC_STRINGS);
g_object_class_install_property (object_class, PROP_HEADING, gParamSpecs[PROP_HEADING]);
}
static void
on_compass_heading_changed (GObject *gobject,
GParamSpec *pspec,
gpointer user_data)
{
g_object_notify_by_pspec (G_OBJECT (user_data),
gParamSpecs[PROP_HEADING]);
}
static void
on_compass_claimed (GObject *source_object,
GAsyncResult *res,
gpointer user_data)
{
GClueCompass *compass;
Compass *proxy = COMPASS (source_object);
g_autoptr(GError) error = NULL;
if (!compass_call_claim_compass_finish (proxy, res, &error)) {
if (error && !g_error_matches (error, G_IO_ERROR,
G_IO_ERROR_CANCELLED)) {
g_debug ("Failed to claim IIO proxy compass: %s",
error->message);
}
g_object_unref (proxy);
return;
}
g_debug ("IIO compass claimed");
compass = GCLUE_COMPASS (user_data);
compass->priv->proxy = proxy;
g_object_notify_by_pspec (G_OBJECT (compass),
gParamSpecs[PROP_HEADING]);
g_signal_connect_object (G_OBJECT (proxy),
"notify::compass-heading",
G_CALLBACK (on_compass_heading_changed),
compass,
G_CONNECT_AFTER);
}
static void
on_compass_proxy_ready (GObject *source_object,
GAsyncResult *res,
gpointer user_data)
{
GClueCompass *compass;
Compass *proxy;
g_autoptr(GError) error = NULL;
proxy = compass_proxy_new_for_bus_finish (res, &error);
if (proxy == NULL) {
if (error && !g_error_matches (error, G_IO_ERROR,
G_IO_ERROR_CANCELLED)) {
g_debug ("Failed to connect to IIO compass proxy: %s",
error->message);
}
return;
}
compass = GCLUE_COMPASS (user_data);
compass_call_claim_compass (proxy,
compass->priv->cancellable,
on_compass_claimed,
compass);
}
static void
gclue_compass_init (GClueCompass *compass)
{
compass->priv = gclue_compass_get_instance_private(compass);
compass->priv->cancellable = g_cancellable_new ();
compass_proxy_new_for_bus (G_BUS_TYPE_SYSTEM,
G_DBUS_PROXY_FLAGS_NONE,
"net.hadess.SensorProxy",
"/net/hadess/SensorProxy/Compass",
compass->priv->cancellable,
on_compass_proxy_ready,
compass);
}
static void
on_compass_destroyed (gpointer data,
GObject *where_the_object_was)
{
GClueCompass **compass = (GClueCompass **) data;
*compass = NULL;
}
/**
* gclue_compass_get_singleton:
*
* Get the #GClueCompass singleton.
*
* Returns: (transfer full): a new ref to #GClueCompass. Use g_object_unref()
* when done.
**/
GClueCompass *
gclue_compass_get_singleton (void)
{
static GClueCompass *compass = NULL;
if (compass == NULL) {
compass = g_object_new (GCLUE_TYPE_COMPASS, NULL);
g_object_weak_ref (G_OBJECT (compass),
on_compass_destroyed,
&compass);
} else
g_object_ref (compass);
return compass;
}
/**
* gclue_compass_get_heading:
* @compass: a #GClueCompass
*
* Gets the positive angle between direction of movement and North direction.
* The angle is measured in degrees.
*
* Returns: The heading, or %GCLUE_LOCATION_HEADING_UNKNOWN if heading is
* unknown.
**/
gdouble
gclue_compass_get_heading (GClueCompass *compass)
{
gdouble ret = GCLUE_LOCATION_HEADING_UNKNOWN;
g_return_val_if_fail (GCLUE_IS_COMPASS (compass), ret);
if (compass->priv->proxy == NULL)
return GCLUE_LOCATION_HEADING_UNKNOWN;
/* FIXME:
*
* IIO compass gives us raw magnetic heading so we need to translate it
* to true heading here. Some pointers on that from elad:
*
* A Python implementation:
* https://github.com/cmweiss/geomag/blob/master/geomag/geomag/geomag.py
*
* It seems to use the magnetic model from NOAA:
* http://www.ngdc.noaa.gov/geomag/WMM/
*
* C implementation: http://www.ngdc.noaa.gov/geomag/WMM/soft.shtml
*/
ret = compass_get_compass_heading (compass->priv->proxy);
if (ret >= 0)
return ret;
else
return GCLUE_LOCATION_HEADING_UNKNOWN;
}
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