The profile is implemented in txpower.[ch]. A GATT service is registered
with a read callback on the Tx power level attribute.
The Tx power of each LE device is requested from the controller on
connection. Upon receipt, it is cached in a connected_device structure.
When a remote device asks for its Tx power level, the cached value is
returned. The cache is deleted on disconnection.
---
Makefile.am | 3 +-
proximity/reporter.c | 48 +--------
proximity/txpower.c | 292 ++++++++++++++++++++++++++++++++++++++++++++++++++
proximity/txpower.h | 24 ++++
4 files changed, 321 insertions(+), 46 deletions(-)
create mode 100644 proximity/txpower.c
create mode 100644 proximity/txpower.h
diff --git a/Makefile.am b/Makefile.am
index 0295ce2..d6e1b87 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -206,7 +206,8 @@ builtin_sources += proximity/main.c \
proximity/monitor.h proximity/monitor.c \
proximity/reporter.h proximity/reporter.c \
proximity/linkloss.h proximity/linkloss.c \
- proximity/immalert.h proximity/immalert.c
+ proximity/immalert.h proximity/immalert.c \
+ proximity/txpower.h proximity/txpower.c
endif
if SERVICEPLUGIN
diff --git a/proximity/reporter.c b/proximity/reporter.c
index d540233..0da08cc 100644
--- a/proximity/reporter.c
+++ b/proximity/reporter.c
@@ -46,6 +46,7 @@
#include "reporter.h"
#include "linkloss.h"
#include "immalert.h"
+#include "txpower.h"
#define BLUEZ_SERVICE "org.bluez"
@@ -74,50 +75,6 @@ const char *get_alert_level_string(uint8_t level)
return "unknown";
}
-static void register_tx_power(struct btd_adapter *adapter)
-{
- uint16_t start_handle, h;
- const int svc_size = 4;
- uint8_t atval[256];
- bt_uuid_t uuid;
-
- bt_uuid16_create(&uuid, TX_POWER_SVC_UUID);
- start_handle = attrib_db_find_avail(adapter, &uuid, svc_size);
- if (start_handle == 0) {
- error("Not enough free handles to register service");
- return;
- }
-
- DBG("start_handle=0x%04x", start_handle);
-
- h = start_handle;
-
- /* Primary service definition */
- bt_uuid16_create(&uuid, GATT_PRIM_SVC_UUID);
- att_put_u16(TX_POWER_SVC_UUID, &atval[0]);
- attrib_db_add(adapter, h++, &uuid, ATT_NONE, ATT_NOT_PERMITTED, atval, 2);
-
- /* Power level characteristic */
- bt_uuid16_create(&uuid, GATT_CHARAC_UUID);
- atval[0] = ATT_CHAR_PROPER_READ | ATT_CHAR_PROPER_NOTIFY;
- att_put_u16(h + 1, &atval[1]);
- att_put_u16(POWER_LEVEL_CHR_UUID, &atval[3]);
- attrib_db_add(adapter, h++, &uuid, ATT_NONE, ATT_NOT_PERMITTED, atval, 5);
-
- /* Power level value */
- bt_uuid16_create(&uuid, POWER_LEVEL_CHR_UUID);
- att_put_u8(0x00, &atval[0]);
- attrib_db_add(adapter, h++, &uuid, ATT_NONE, ATT_NOT_PERMITTED, atval, 1);
-
- /* Client characteristic configuration */
- bt_uuid16_create(&uuid, GATT_CLIENT_CHARAC_CFG_UUID);
- atval[0] = 0x00;
- atval[1] = 0x00;
- attrib_db_add(adapter, h++, &uuid, ATT_NONE, ATT_NONE, atval, 2);
-
- g_assert(h - start_handle == svc_size);
-}
-
static DBusMessage *get_properties(DBusConnection *conn,
DBusMessage *msg, void *data)
{
@@ -251,7 +208,7 @@ int reporter_init(struct btd_adapter *adapter)
radapter->conn = conn;
register_link_loss(adapter, radapter->conn);
- register_tx_power(adapter);
+ register_tx_power(adapter, radapter->conn);
register_imm_alert(adapter, radapter->conn);
/*
@@ -309,6 +266,7 @@ void reporter_exit(struct btd_adapter *adapter)
unregister_link_loss(adapter);
unregister_imm_alert(adapter);
+ unregister_tx_power(adapter);
dbus_connection_unref(radapter->conn);
reporter_adapters = g_slist_remove(reporter_adapters, radapter);
diff --git a/proximity/txpower.c b/proximity/txpower.c
new file mode 100644
index 0000000..4b2e65d
--- /dev/null
+++ b/proximity/txpower.c
@@ -0,0 +1,292 @@
+/*
+ *
+ * BlueZ - Bluetooth protocol stack for Linux
+ *
+ * Copyright (C) 2012 Texas Instruments Corporation
+ *
+ * This program 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.
+ *
+ * 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 <glib.h>
+#include <bluetooth/uuid.h>
+#include <adapter.h>
+
+#include <dbus/dbus.h>
+#include <gdbus.h>
+
+#include "log.h"
+#include "att.h"
+#include "gattrib.h"
+#include "gatt-service.h"
+#include "attrib-server.h"
+#include "device.h"
+#include "reporter.h"
+#include "txpower.h"
+
+#define MIN_TX_POWER_LEVEL (-100)
+
+#define BLUEZ_SERVICE "org.bluez"
+
+struct tx_power_adapter {
+ struct btd_adapter *adapter;
+ DBusConnection *conn;
+ GSList *connected_devices;
+ guint watch;
+};
+
+struct connected_device {
+ struct btd_device *device;
+ struct tx_power_adapter *adapter;
+ int8_t tx_power_level;
+};
+
+static GSList *tx_power_adapters;
+
+static int tpdevice_cmp(gconstpointer a, gconstpointer b)
+{
+ const struct connected_device *condev = a;
+ const struct btd_device *device = b;
+
+ if (condev->device == device)
+ return 0;
+
+ return -1;
+}
+
+static struct connected_device *
+find_connected_device(struct tx_power_adapter *ta, struct btd_device *device)
+{
+ GSList *l = g_slist_find_custom(ta->connected_devices, device,
+ tpdevice_cmp);
+ if (!l)
+ return NULL;
+
+ return l->data;
+}
+
+static int tpadapter_cmp(gconstpointer a, gconstpointer b)
+{
+ const struct tx_power_adapter *ta = a;
+ const struct btd_adapter *adapter = b;
+
+ if (ta->adapter == adapter)
+ return 0;
+
+ return -1;
+}
+
+static struct tx_power_adapter *
+find_tx_power_adapter(struct btd_adapter *adapter)
+{
+ GSList *l = g_slist_find_custom(tx_power_adapters, adapter,
+ tpadapter_cmp);
+ if (!l)
+ return NULL;
+
+ return l->data;
+}
+
+/* condev can be NULL */
+static void tx_power_remove_condev(struct connected_device *condev)
+{
+ struct tx_power_adapter *ta;
+
+ if (!condev)
+ return;
+
+ ta = condev->adapter;
+
+ if (condev->device)
+ btd_device_unref(condev->device);
+
+ ta->connected_devices = g_slist_remove(ta->connected_devices, condev);
+ g_free(condev);
+}
+
+static uint8_t tx_power_attrib_read(struct attribute *a, gpointer user_data,
+ struct btd_device *device)
+{
+ struct tx_power_adapter *ta = user_data;
+ struct connected_device *condev;
+ int8_t value = MIN_TX_POWER_LEVEL;
+
+ if (!device)
+ goto out;
+
+ condev = find_connected_device(ta, device);
+ if (!condev)
+ goto out;
+
+ value = condev->tx_power_level;
+
+out:
+ attrib_db_update(ta->adapter, a->handle, NULL, (uint8_t *)&value,
+ sizeof(value), NULL);
+ DBG("Tx power level: %d", value);
+ return 0;
+}
+
+static void tx_power_read_cb(struct btd_adapter *adapter,
+ struct btd_device *dev, int8_t level,
+ gpointer user_data)
+{
+ struct tx_power_adapter *ta = user_data;
+ struct connected_device *condev;
+
+ ta = find_tx_power_adapter(adapter);
+ if (!ta)
+ return;
+
+ condev = find_connected_device(ta, dev);
+ if (!condev)
+ return;
+
+ condev->tx_power_level = level;
+ DBG("updated tx power level of %p to %d", dev, level);
+}
+
+static gboolean handle_property_change(DBusConnection *conn, DBusMessage *msg,
+ void *data)
+{
+ struct tx_power_adapter *ta = data;
+ DBusMessageIter iter, sub;
+ const char *property;
+ dbus_bool_t conn_state;
+ struct btd_device *device;
+ struct connected_device *condev;
+ const char *obj_path = dbus_message_get_path(msg);
+
+ DBG("path %s", obj_path);
+
+ dbus_message_iter_init(msg, &iter);
+
+ if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING) {
+ error("Unexpected signature in device PropertyChanged signal");
+ return TRUE;
+ }
+
+ dbus_message_iter_get_basic(&iter, &property);
+ DBG("property %s", property);
+
+ dbus_message_iter_next(&iter);
+ dbus_message_iter_recurse(&iter, &sub);
+ if (!g_str_equal(property, "Connected"))
+ return TRUE;
+
+ device = adapter_get_device_by_path(ta->adapter, obj_path);
+ if (!device)
+ return TRUE;
+
+ dbus_message_iter_get_basic(&sub, &conn_state);
+ DBG("Connected %d", conn_state);
+ if (conn_state) {
+ /* we only care about LE devices */
+ if (device_is_bredr(device))
+ return TRUE;
+
+ condev = g_new0(struct connected_device, 1);
+ condev->device = btd_device_ref(device);
+ condev->adapter = ta;
+ condev->tx_power_level = MIN_TX_POWER_LEVEL;
+ ta->connected_devices = g_slist_append(ta->connected_devices,
+ condev);
+
+ /*
+ * Get the Tx power to this device. It cannot change during
+ * an LE connection.
+ */
+ adapter_read_tx_power(ta->adapter, device,
+ TX_POWER_CURRENT_POWER,
+ tx_power_read_cb, ta);
+
+ DBG("added connecting device %p", device);
+ } else {
+ condev = find_connected_device(ta, device);
+ if (condev) {
+ tx_power_remove_condev(condev);
+ DBG("removed disconnecting device %p", device);
+ }
+ }
+
+ return TRUE;
+}
+
+void register_tx_power(struct btd_adapter *adapter, DBusConnection *conn)
+{
+ gboolean svc_added;
+ bt_uuid_t uuid;
+ struct tx_power_adapter *ta;
+
+ bt_uuid16_create(&uuid, TX_POWER_SVC_UUID);
+
+ ta = g_new0(struct tx_power_adapter, 1);
+ ta->adapter = adapter;
+ ta->conn = conn;
+
+ tx_power_adapters = g_slist_append(tx_power_adapters, ta);
+
+ /* Tx Power Service */
+ svc_added = gatt_service_add(adapter,
+ GATT_PRIM_SVC_UUID, &uuid,
+ /* Power level characteristic */
+ GATT_OPT_CHR_UUID, POWER_LEVEL_CHR_UUID,
+ GATT_OPT_CHR_PROPS, ATT_CHAR_PROPER_READ,
+ GATT_OPT_CHR_VALUE_CB, ATTRIB_READ,
+ tx_power_attrib_read, ta,
+ GATT_OPT_INVALID);
+
+ if (!svc_added)
+ goto err;
+
+ /* watch for connecting/disconnecting devices */
+ ta->watch = g_dbus_add_signal_watch(ta->conn,
+ BLUEZ_SERVICE, NULL, DEVICE_INTERFACE,
+ "PropertyChanged", handle_property_change,
+ ta, NULL);
+
+ DBG("Tx Power service added");
+ return;
+
+err:
+ error("Error adding Tx Power service");
+ unregister_tx_power(adapter);
+}
+
+static void remove_condev_list_item(gpointer data, gpointer user_data)
+{
+ struct connected_device *condev = data;
+
+ tx_power_remove_condev(condev);
+}
+
+void unregister_tx_power(struct btd_adapter *adapter)
+{
+ struct tx_power_adapter *ta = find_tx_power_adapter(adapter);
+ if (!ta)
+ return;
+
+ g_dbus_remove_watch(ta->conn, ta->watch);
+
+ g_slist_foreach(ta->connected_devices, remove_condev_list_item, NULL);
+ dbus_connection_unref(ta->conn);
+
+ tx_power_adapters = g_slist_remove(tx_power_adapters, ta);
+ g_free(ta);
+}
diff --git a/proximity/txpower.h b/proximity/txpower.h
new file mode 100644
index 0000000..91c9dcc
--- /dev/null
+++ b/proximity/txpower.h
@@ -0,0 +1,24 @@
+/*
+ *
+ * BlueZ - Bluetooth protocol stack for Linux
+ *
+ * Copyright (C) 2012 Texas Instruments Corporation
+ *
+ * This program 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.
+ *
+ * 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
+ *
+ */
+
+void register_tx_power(struct btd_adapter *adapter, DBusConnection *conn);
+void unregister_tx_power(struct btd_adapter *adapter);
--
1.7.5.4
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