---
 Makefile.am                |    5 +-
 doc/text-telephony-api.txt |   38 +++++
 include/dbus.h             |    1 +
 include/text-telephony.h   |   71 ++++++++++
 src/modem.c                |    1 +
 src/ofono.h                |    2 +
 src/text-telephony.c       |  333 ++++++++++++++++++++++++++++++++++++++++++++
 7 files changed, 449 insertions(+), 2 deletions(-)
 create mode 100644 doc/text-telephony-api.txt
 create mode 100644 include/text-telephony.h
 create mode 100644 src/text-telephony.c

diff --git a/Makefile.am b/Makefile.am
index f841b4c..ee1313d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -13,7 +13,8 @@ include_HEADERS = include/log.h include/plugin.h 
include/history.h \
                        include/cbs.h include/call-volume.h \
                        include/gprs.h include/gprs-context.h \
                        include/radio-settings.h include/stk.h \
-                       include/audio-settings.h include/nettime.h
+                       include/audio-settings.h include/nettime.h \
+                       include/text-telephony.h
 
 nodist_include_HEADERS = include/version.h
 
@@ -318,7 +319,7 @@ src_ofonod_SOURCES = $(gdbus_sources) $(builtin_sources) 
src/ofono.ver \
                        src/radio-settings.c src/stkutil.h src/stkutil.c \
                        src/nettime.c src/stkagent.c src/stkagent.h \
                        src/simfs.c src/simfs.h src/audio-settings.c \
-                       src/smsagent.c src/smsagent.h
+                       src/smsagent.c src/smsagent.h src/text-telephony.c
 
 src_ofonod_LDADD = $(builtin_libadd) @GLIB_LIBS@ @DBUS_LIBS@ @CAPNG_LIBS@ -ldl
 
diff --git a/doc/text-telephony-api.txt b/doc/text-telephony-api.txt
new file mode 100644
index 0000000..8623d5f
--- /dev/null
+++ b/doc/text-telephony-api.txt
@@ -0,0 +1,38 @@
+Text Telephony hierarchy
+========================
+
+Service                org.ofono
+Interface      org.ofono.TextTelephony
+Object path    [variable prefix]/{modem0,modem1,...}
+
+Methods                dict GetProperties()
+
+                       Returns all Text Telephony properties. See the
+                       properties section for available properties.
+
+                       Possible Errors: [service].Error.InvalidArguments
+
+               void SetProperty(string name, variant value)
+
+                       Changes the value of the specified property. Only
+                       properties that are listed as read-write are
+                       changeable. On success a PropertyChanged signal
+                       will be emitted.
+
+                       Possible Errors: [service].Error.InvalidArguments
+                                        [service].Error.DoesNotExist
+                                        [service].Error.InProgress
+
+Signals                PropertyChanged(string property, variant value)
+
+                       This signal indicates a changed value of the given
+                       property.
+
+Properties     boolean Powered [readwrite]
+
+                       This property will enable or disable the text
+                       telephony feature in the modem.
+
+                       Text telephony (TTY), also known as TDD, is a feature
+                       present in some modems that allow them to be used by
+                       hearing impaired people.
diff --git a/include/dbus.h b/include/dbus.h
index 59b2aae..9e29afb 100644
--- a/include/dbus.h
+++ b/include/dbus.h
@@ -48,6 +48,7 @@ extern "C" {
 #define OFONO_PHONEBOOK_INTERFACE "org.ofono.Phonebook"
 #define OFONO_RADIO_SETTINGS_INTERFACE "org.ofono.RadioSettings"
 #define OFONO_AUDIO_SETTINGS_INTERFACE "org.ofono.AudioSettings"
+#define OFONO_TEXT_TELEPHONY_INTERFACE "org.ofono.TextTelephony"
 #define OFONO_SIM_MANAGER_INTERFACE "org.ofono.SimManager"
 #define OFONO_VOICECALL_INTERFACE "org.ofono.VoiceCall"
 #define OFONO_VOICECALL_MANAGER_INTERFACE "org.ofono.VoiceCallManager"
diff --git a/include/text-telephony.h b/include/text-telephony.h
new file mode 100644
index 0000000..fafa7dd
--- /dev/null
+++ b/include/text-telephony.h
@@ -0,0 +1,71 @@
+/*
+ *
+ *  oFono - Open Source Telephony
+ *
+ *  Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+ *  Copyright (C) 2010  Intel Corporation. All rights reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  This program 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 this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifndef __OFONO_TEXT_TELEPHONY_H
+#define __OFONO_TEXT_TELEPHONY_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <ofono/types.h>
+
+struct ofono_text_telephony;
+
+typedef void (*ofono_text_telephony_set_cb_t)(const struct ofono_error *error,
+                                               void *data);
+typedef void (*ofono_text_telephony_query_cb_t)(const struct ofono_error 
*error,
+                                               ofono_bool_t enable, void 
*data);
+
+struct ofono_text_telephony_driver {
+       const char *name;
+       int (*probe)(struct ofono_text_telephony *tt, unsigned int vendor,
+                       void *data);
+       void (*remove)(struct ofono_text_telephony *tt);
+       void (*query_tty)(struct ofono_text_telephony *tt,
+                               ofono_text_telephony_query_cb_t cb,
+                               void *data);
+       void (*set_tty)(struct ofono_text_telephony *tt,
+                               int enable,
+                               ofono_text_telephony_set_cb_t cb,
+                               void *data);
+};
+
+int ofono_text_telephony_driver_register(const struct 
ofono_text_telephony_driver *d);
+void ofono_text_telephony_driver_unregister(const struct 
ofono_text_telephony_driver *d);
+
+struct ofono_text_telephony *ofono_text_telephony_create(struct ofono_modem 
*modem,
+                                                               unsigned int 
vendor,
+                                                               const char 
*driver,
+                                                               void *data);
+
+void ofono_text_telephony_register(struct ofono_text_telephony *tt);
+void ofono_text_telephony_remove(struct ofono_text_telephony *tt);
+
+void ofono_text_telephony_set_data(struct ofono_text_telephony *tt, void 
*data);
+void *ofono_text_telephony_get_data(struct ofono_text_telephony *tt);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __OFONO_TEXT_TELEPHONY_H */
diff --git a/src/modem.c b/src/modem.c
index 3776461..6f1db7c 100644
--- a/src/modem.c
+++ b/src/modem.c
@@ -857,6 +857,7 @@ static const struct {
        { OFONO_SIM_MANAGER_INTERFACE,                  "sim"   },
        { OFONO_STK_INTERFACE,                          "stk"   },
        { OFONO_CONNECTION_MANAGER_INTERFACE,           "gprs"  },
+       { OFONO_TEXT_TELEPHONY_INTERFACE,               "tty"   },
        { },
 };
 
diff --git a/src/ofono.h b/src/ofono.h
index 4d76d20..5218f42 100644
--- a/src/ofono.h
+++ b/src/ofono.h
@@ -124,6 +124,7 @@ enum ofono_atom_type {
        OFONO_ATOM_TYPE_AUDIO_SETTINGS = 19,
        OFONO_ATOM_TYPE_STK = 20,
        OFONO_ATOM_TYPE_NETTIME = 21,
+       OFONO_ATOM_TYPE_TEXT_TELEPHONY = 22
 };
 
 enum ofono_atom_watch_condition {
@@ -197,6 +198,7 @@ gboolean __ofono_call_settings_is_busy(struct 
ofono_call_settings *cs);
 #include <ofono/gprs-context.h>
 #include <ofono/radio-settings.h>
 #include <ofono/audio-settings.h>
+#include <ofono/text-telephony.h>
 
 #include <ofono/voicecall.h>
 
diff --git a/src/text-telephony.c b/src/text-telephony.c
new file mode 100644
index 0000000..4640bd8
--- /dev/null
+++ b/src/text-telephony.c
@@ -0,0 +1,333 @@
+/*
+ *
+ *  oFono - Open Source Telephony
+ *
+ *  Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+ *  Copyright (C) 2010  Intel Corporation. All rights reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  This program 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 this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+
+#include <glib.h>
+#include <gdbus.h>
+
+#include "ofono.h"
+#include "common.h"
+
+static GSList *g_drivers = NULL;
+
+struct ofono_text_telephony {
+       DBusMessage *pending;
+       ofono_bool_t powered;
+       ofono_bool_t powered_pending;
+       const struct ofono_text_telephony_driver *driver;
+       void *driver_data;
+       struct ofono_atom *atom;
+};
+
+static DBusMessage *tt_get_properties_reply(DBusMessage *msg,
+                                               struct ofono_text_telephony *tt)
+{
+       DBusMessage *reply;
+       DBusMessageIter iter;
+       DBusMessageIter dict;
+       dbus_bool_t value;
+
+       reply = dbus_message_new_method_return(msg);
+       if (!reply)
+               return NULL;
+
+       dbus_message_iter_init_append(reply, &iter);
+       dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY,
+                                       OFONO_PROPERTIES_ARRAY_SIGNATURE,
+                                       &dict);
+
+       value = tt->powered;
+       ofono_dbus_dict_append(&dict, "Powered", DBUS_TYPE_BOOLEAN, &value);
+       dbus_message_iter_close_container(&iter, &dict);
+
+       return reply;
+}
+
+static void tt_set_powered(struct ofono_text_telephony *tt,
+                                       ofono_bool_t enable)
+{
+       DBusConnection *conn = ofono_dbus_get_connection();
+       const char *path = __ofono_atom_get_path(tt->atom);
+       dbus_bool_t value = enable;
+
+       if (tt->powered == enable)
+               return;
+
+       ofono_dbus_signal_property_changed(conn, path,
+                                               OFONO_TEXT_TELEPHONY_INTERFACE,
+                                               "Powered",
+                                               DBUS_TYPE_BOOLEAN, &value);
+       tt->powered = enable;
+}
+
+static void tt_set_powered_callback(const struct ofono_error *error,
+                                               void *data)
+{
+       struct ofono_text_telephony *tt = data;
+       DBusMessage *reply;
+
+       if (error->type != OFONO_ERROR_TYPE_NO_ERROR) {
+               DBG("Error setting powered property");
+
+               tt->powered_pending = tt->powered;
+
+               reply = __ofono_error_failed(tt->pending);
+               __ofono_dbus_pending_reply(&tt->pending, reply);
+
+               return;
+       }
+
+       reply = dbus_message_new_method_return(tt->pending);
+       __ofono_dbus_pending_reply(&tt->pending, reply);
+
+       tt_set_powered(tt, tt->powered_pending);
+}
+
+static void tt_send_properties_reply(struct ofono_text_telephony *tt)
+{
+       DBusMessage *reply;
+
+       reply = tt_get_properties_reply(tt->pending, tt);
+       __ofono_dbus_pending_reply(&tt->pending, reply);
+}
+
+static void tt_query_powered_callback(const struct ofono_error *error,
+                                               ofono_bool_t enable, void *data)
+{
+       struct ofono_text_telephony *tt = data;
+
+       if (error->type != OFONO_ERROR_TYPE_NO_ERROR) {
+               DBusMessage *reply;
+
+               ofono_debug("Error during powered query");
+
+               reply = __ofono_error_failed(tt->pending);
+               __ofono_dbus_pending_reply(&tt->pending, reply);
+
+               return;
+       }
+
+       tt_set_powered(tt, enable);
+       tt_send_properties_reply(tt);
+}
+
+static DBusMessage *tt_get_properties(DBusConnection *conn,
+                                               DBusMessage *msg, void *data)
+{
+       struct ofono_text_telephony *tt = data;
+
+       if (tt->pending)
+               return __ofono_error_busy(msg);
+
+       tt->pending = dbus_message_ref(msg);
+       tt->driver->query_tty(tt, tt_query_powered_callback, tt);
+
+       return NULL;
+}
+
+static DBusMessage *tt_set_property(DBusConnection *conn, DBusMessage *msg,
+                                       void *data)
+{
+       struct ofono_text_telephony *tt = data;
+       DBusMessageIter iter;
+       DBusMessageIter var;
+       const char *property;
+
+       if (tt->pending)
+               return __ofono_error_busy(msg);
+
+       if (!dbus_message_iter_init(msg, &iter))
+               return __ofono_error_invalid_args(msg);
+
+       if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
+               return __ofono_error_invalid_args(msg);
+
+       dbus_message_iter_get_basic(&iter, &property);
+       dbus_message_iter_next(&iter);
+
+       if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT)
+               return __ofono_error_invalid_args(msg);
+
+       dbus_message_iter_recurse(&iter, &var);
+
+       if (g_strcmp0(property, "Powered") == 0) {
+               dbus_bool_t value;
+               int target;
+
+               if (dbus_message_iter_get_arg_type(&var) != DBUS_TYPE_BOOLEAN)
+                       return __ofono_error_invalid_args(msg);
+
+               dbus_message_iter_get_basic(&var, &value);
+               target = value;
+
+               if (tt->powered == target)
+                       return dbus_message_new_method_return(msg);
+
+               tt->pending = dbus_message_ref(msg);
+               tt->powered_pending = target;
+
+               tt->driver->set_tty(tt, target,
+                                       tt_set_powered_callback, tt);
+               return NULL;
+       }
+
+       return __ofono_error_invalid_args(msg);
+}
+
+static GDBusMethodTable tt_methods[] = {
+       { "GetProperties",  "",    "a{sv}",  tt_get_properties,
+                                               G_DBUS_METHOD_FLAG_ASYNC },
+       { "SetProperty",    "sv",  "",       tt_set_property,
+                                               G_DBUS_METHOD_FLAG_ASYNC },
+       { }
+};
+
+static GDBusSignalTable tt_signals[] = {
+       { "PropertyChanged",    "sv" },
+       { }
+};
+
+int ofono_text_telephony_driver_register(const struct 
ofono_text_telephony_driver *d)
+{
+       DBG("driver: %p, name: %s", d, d->name);
+
+       if (!d || !d->probe)
+               return -EINVAL;
+
+       g_drivers = g_slist_prepend(g_drivers, (void *)d);
+
+       return 0;
+}
+
+void ofono_text_telephony_driver_unregister(const struct 
ofono_text_telephony_driver *d)
+{
+       DBG("driver: %p, name: %s", d, d->name);
+
+       if (!d)
+               return;
+
+       g_drivers = g_slist_remove(g_drivers, (void *)d);
+}
+
+static void text_telephony_unregister(struct ofono_atom *atom)
+{
+       struct ofono_text_telephony *tt = __ofono_atom_get_data(atom);
+       const char *path = __ofono_atom_get_path(tt->atom);
+       DBusConnection *conn = ofono_dbus_get_connection();
+       struct ofono_modem *modem = __ofono_atom_get_modem(tt->atom);
+
+       ofono_modem_remove_interface(modem, OFONO_TEXT_TELEPHONY_INTERFACE);
+       g_dbus_unregister_interface(conn, path, OFONO_TEXT_TELEPHONY_INTERFACE);
+}
+
+static void text_telephony_remove(struct ofono_atom *atom)
+{
+       struct ofono_text_telephony *tt = __ofono_atom_get_data(atom);
+
+       DBG("atom: %p", atom);
+
+       if (!tt)
+               return;
+
+       if (tt->driver && tt->driver->remove)
+               tt->driver->remove(tt);
+
+       g_free(tt);
+}
+
+struct ofono_text_telephony *ofono_text_telephony_create(struct ofono_modem 
*modem,
+                                                       unsigned int vendor,
+                                                       const char *driver,
+                                                       void *data)
+{
+       struct ofono_text_telephony *tt;
+       GSList *l;
+       if (!driver)
+               return NULL;
+
+       tt = g_try_new0(struct ofono_text_telephony, 1);
+       if (!tt)
+               return NULL;
+
+       tt->atom = __ofono_modem_add_atom(modem, OFONO_ATOM_TYPE_TEXT_TELEPHONY,
+                                               text_telephony_remove, tt);
+
+       tt->powered = -1;
+
+       for (l = g_drivers; l; l = l->next) {
+               const struct ofono_text_telephony_driver *drv = l->data;
+
+               if (g_strcmp0(drv->name, driver) != 0)
+                       continue;
+
+               if (drv->probe(tt, vendor, data) < 0)
+                       continue;
+
+               tt->driver = drv;
+               break;
+       }
+
+       return tt;
+}
+
+void ofono_text_telephony_register(struct ofono_text_telephony *tt)
+{
+       DBusConnection *conn = ofono_dbus_get_connection();
+       struct ofono_modem *modem = __ofono_atom_get_modem(tt->atom);
+       const char *path = __ofono_atom_get_path(tt->atom);
+
+       if (!g_dbus_register_interface(conn, path,
+                                       OFONO_TEXT_TELEPHONY_INTERFACE,
+                                               tt_methods, tt_signals,
+                                       NULL, tt, NULL)) {
+               ofono_error("Could not create %s interface",
+                               OFONO_TEXT_TELEPHONY_INTERFACE);
+
+               return;
+       }
+
+       ofono_modem_add_interface(modem, OFONO_TEXT_TELEPHONY_INTERFACE);
+       __ofono_atom_register(tt->atom, text_telephony_unregister);
+}
+
+void ofono_text_telephony_remove(struct ofono_text_telephony *tt)
+{
+       __ofono_atom_free(tt->atom);
+}
+
+void ofono_text_telephony_set_data(struct ofono_text_telephony *tt,
+                                       void *data)
+{
+       tt->driver_data = data;
+}
+
+void *ofono_text_telephony_get_data(struct ofono_text_telephony *tt)
+{
+       return tt->driver_data;
+}
-- 
1.7.3.2

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