Return-Path: From: armansito@chromium.org To: linux-bluetooth@vger.kernel.org Cc: Arman Uguray Subject: [RFC BlueZ 2/2] gatt-dbus: Add remote GATT characteristic objects. Date: Tue, 11 Mar 2014 21:04:00 -0700 Message-Id: <1394597040-4483-3-git-send-email-armansito@chromium.org> In-Reply-To: <1394597040-4483-1-git-send-email-armansito@chromium.org> References: <1394597040-4483-1-git-send-email-armansito@chromium.org> Sender: linux-bluetooth-owner@vger.kernel.org List-ID: From: Arman Uguray This CL adds remote GATT characteristic objects to the D-Bus API. The API only exposes the UUID; the characteristic value and permissions have not yet been implemented. --- src/gatt-dbus.c | 165 +++++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 164 insertions(+), 1 deletion(-) diff --git a/src/gatt-dbus.c b/src/gatt-dbus.c index 60b87fa..db98137 100644 --- a/src/gatt-dbus.c +++ b/src/gatt-dbus.c @@ -52,8 +52,24 @@ struct btd_gatt_dbus_service { bt_uuid_t uuid; + struct att_range range; + GAttrib *attrib; + guint attioid; + guint request; + struct btd_device *device; char *path; + GSList *characteristics; +}; + +struct gatt_dbus_characteristic { + bt_uuid_t uuid; + uint8_t handle; + uint8_t value_handle; + uint8_t properties; + + struct btd_gatt_dbus_service *service; + char *path; }; struct external_app { @@ -491,19 +507,156 @@ static gboolean service_property_get_uuid(const GDBusPropertyTable *property, return TRUE; } +static gboolean characteristic_property_get_uuid( + const GDBusPropertyTable *table, + DBusMessageIter *iter, void *data) +{ + char uuid[MAX_LEN_UUID_STR + 1]; + const char *ptr = uuid; + struct gatt_dbus_characteristic *chr = data; + + bt_uuid_to_string(&chr->uuid, uuid, sizeof(uuid)); + dbus_message_iter_append_basic(iter, DBUS_TYPE_STRING, &ptr); + + return TRUE; +} + static const GDBusPropertyTable service_properties[] = { { "UUID", "s", service_property_get_uuid }, {} }; +static const GDBusPropertyTable characteristic_properties[] = { + { "UUID", "s", characteristic_property_get_uuid }, + {} +}; + +static void unregister_characteristic(gpointer user_data) +{ + struct gatt_dbus_characteristic *chr = user_data; + g_dbus_unregister_interface(btd_get_dbus_connection(), + chr->path, GATT_CHR_IFACE); +} + +static void attio_cleanup(struct btd_gatt_dbus_service *service) +{ + if (!service->attrib) + return; + GAttrib *attrib = service->attrib; + service->attrib = NULL; + if (service->request) { + g_attrib_cancel(attrib, service->request); + service->request = 0; + } + g_attrib_unref(attrib); +} + static void service_free(gpointer user_data) { struct btd_gatt_dbus_service *service = user_data; + g_slist_free_full(service->characteristics, unregister_characteristic); + + if (service->attioid) { + btd_device_remove_attio_callback(service->device, + service->attioid); + } + attio_cleanup(service); g_free(service->path); g_free(service); } +static void characteristic_free(gpointer user_data) +{ + struct gatt_dbus_characteristic *characteristic = user_data; + + g_free(characteristic->path); + g_free(characteristic); +} + +static struct gatt_dbus_characteristic *characteristic_create( + struct btd_gatt_dbus_service *service, + struct gatt_char *chr) +{ + struct gatt_dbus_characteristic *characteristic; + bt_uuid_t uuid; + + DBG("GATT characteristic UUID: %s", chr->uuid); + + characteristic = g_try_malloc0(sizeof(struct gatt_dbus_characteristic)); + if (characteristic == NULL) + return NULL; + + characteristic->path = g_strdup_printf("%s/char%04X", service->path, + chr->handle); + characteristic->service = service; + characteristic->handle = chr->handle; + characteristic->value_handle = chr->value_handle; + characteristic->properties = chr->properties; + + if (bt_string_to_uuid(&uuid, chr->uuid)) { + error("Characteristic has invalid UUID: %s", chr->uuid); + goto fail; + } + + bt_uuid_to_uuid128(&uuid, &characteristic->uuid); + + DBG("Creating GATT characteristic %s", characteristic->path); + + if (g_dbus_register_interface(btd_get_dbus_connection(), + characteristic->path, + GATT_CHR_IFACE, NULL, NULL, + characteristic_properties, + characteristic, + characteristic_free) == FALSE) { + error("Unable to register GATT characteristic: %s", chr->uuid); + goto fail; + } + + return characteristic; + +fail: + characteristic_free(characteristic); + return NULL; +} + +static void discover_char_cb(uint8_t status, GSList *chars, void *user_data) +{ + struct btd_gatt_dbus_service *service = user_data; + service->request = 0; + if (status) { + error("Characteristic discovery failed."); + return; + } + for (; chars; chars = chars->next) { + struct gatt_char *chr = chars->data; + struct gatt_dbus_characteristic *dbus_chr = + characteristic_create(service, chr); + if (dbus_chr == NULL) + continue; + service->characteristics = g_slist_append( + service->characteristics, dbus_chr); + } + attio_cleanup(service); +} + +static void attio_connected_cb(GAttrib *attrib, gpointer user_data) +{ + struct btd_gatt_dbus_service *service = user_data; + service->attrib = g_attrib_ref(attrib); + service->request = gatt_discover_char(service->attrib, + service->range.start, + service->range.end, + NULL, discover_char_cb, + service); +} + +static void attio_disconnected_cb(gpointer user_data) +{ + struct btd_gatt_dbus_service *service = user_data; + attio_cleanup(service); +} + struct btd_gatt_dbus_service *btd_gatt_dbus_service_create( struct btd_device *device, struct gatt_primary *primary) { @@ -520,6 +673,12 @@ struct btd_gatt_dbus_service *btd_gatt_dbus_service_create( service->path = g_strdup_printf("%s/service%04X", device_path, primary->range.start); + service->device = device; + service->range = primary->range; + service->characteristics = NULL; + service->attrib = NULL; + service->request = 0; + if (bt_string_to_uuid(&uuid, primary->uuid)) { error("Primary has invalid UUID: %s", primary->uuid); goto fail; @@ -541,7 +700,11 @@ struct btd_gatt_dbus_service *btd_gatt_dbus_service_create( goto fail; } - service->device = device; + service->attioid = service->attioid = btd_device_add_attio_callback( + service->device, + attio_connected_cb, + attio_disconnected_cb, service); + return service; fail: -- 1.8.3.2