| /* |
| * |
| * 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 <stdbool.h> |
| |
| #include <glib.h> |
| #include <adapter.h> |
| |
| #include <dbus/dbus.h> |
| #include <gdbus/gdbus.h> |
| |
| #include "lib/uuid.h" |
| #include "log.h" |
| #include "attrib/att-database.h" |
| #include "attrib/gattrib.h" |
| #include "attrib/att.h" |
| #include "attrib/gatt.h" |
| #include "attrib/gatt-service.h" |
| #include "attrib-server.h" |
| #include "device.h" |
| #include "profile.h" |
| #include "attio.h" |
| #include "dbus-common.h" |
| #include "reporter.h" |
| #include "linkloss.h" |
| |
| struct link_loss_adapter { |
| struct btd_adapter *adapter; |
| uint16_t alert_lvl_value_handle; |
| GSList *connected_devices; |
| }; |
| |
| struct connected_device { |
| struct btd_device *device; |
| struct link_loss_adapter *adapter; |
| uint8_t alert_level; |
| guint callback_id; |
| guint local_disc_id; |
| }; |
| |
| static GSList *link_loss_adapters; |
| |
| static int lldevice_cmp(gconstpointer a, gconstpointer b) |
| { |
| const struct connected_device *llcondev = a; |
| const struct btd_device *device = b; |
| |
| if (llcondev->device == device) |
| return 0; |
| |
| return -1; |
| } |
| |
| static struct connected_device * |
| find_connected_device(struct link_loss_adapter *la, struct btd_device *device) |
| { |
| GSList *l = g_slist_find_custom(la->connected_devices, device, |
| lldevice_cmp); |
| if (!l) |
| return NULL; |
| |
| return l->data; |
| } |
| |
| static int lladapter_cmp(gconstpointer a, gconstpointer b) |
| { |
| const struct link_loss_adapter *lladapter = a; |
| const struct btd_adapter *adapter = b; |
| |
| if (lladapter->adapter == adapter) |
| return 0; |
| |
| return -1; |
| } |
| |
| static struct link_loss_adapter * |
| find_link_loss_adapter(struct btd_adapter *adapter) |
| { |
| GSList *l = g_slist_find_custom(link_loss_adapters, adapter, |
| lladapter_cmp); |
| if (!l) |
| return NULL; |
| |
| return l->data; |
| } |
| |
| const char *link_loss_get_alert_level(struct btd_device *device) |
| { |
| struct link_loss_adapter *lladapter; |
| struct connected_device *condev; |
| |
| if (!device) |
| return get_alert_level_string(NO_ALERT); |
| |
| lladapter = find_link_loss_adapter(device_get_adapter(device)); |
| if (!lladapter) |
| return get_alert_level_string(NO_ALERT); |
| |
| condev = find_connected_device(lladapter, device); |
| if (!condev) |
| return get_alert_level_string(NO_ALERT); |
| |
| return get_alert_level_string(condev->alert_level); |
| } |
| |
| static void link_loss_emit_alert_signal(struct connected_device *condev) |
| { |
| const char *alert_level_str, *path; |
| |
| if (!condev->device) |
| return; |
| |
| path = device_get_path(condev->device); |
| alert_level_str = get_alert_level_string(condev->alert_level); |
| |
| DBG("alert %s remote %s", alert_level_str, path); |
| |
| g_dbus_emit_property_changed(btd_get_dbus_connection(), path, |
| PROXIMITY_REPORTER_INTERFACE, "LinkLossAlertLevel"); |
| } |
| |
| static uint8_t link_loss_alert_lvl_read(struct attribute *a, |
| struct btd_device *device, gpointer user_data) |
| { |
| struct link_loss_adapter *la = user_data; |
| struct connected_device *condev; |
| uint8_t alert_level = NO_ALERT; |
| |
| if (!device) |
| goto out; |
| |
| condev = find_connected_device(la, device); |
| if (!condev) |
| goto out; |
| |
| alert_level = condev->alert_level; |
| |
| out: |
| DBG("return alert level %d for dev %p", alert_level, device); |
| |
| /* update the alert level according to the requesting device */ |
| attrib_db_update(la->adapter, a->handle, NULL, &alert_level, |
| sizeof(alert_level), NULL); |
| |
| return 0; |
| } |
| |
| /* condev can be NULL */ |
| static void link_loss_remove_condev(struct connected_device *condev) |
| { |
| struct link_loss_adapter *la; |
| |
| if (!condev) |
| return; |
| |
| la = condev->adapter; |
| |
| if (condev->callback_id && condev->device) |
| btd_device_remove_attio_callback(condev->device, |
| condev->callback_id); |
| |
| if (condev->local_disc_id && condev->device) |
| device_remove_disconnect_watch(condev->device, |
| condev->local_disc_id); |
| |
| if (condev->device) |
| btd_device_unref(condev->device); |
| |
| la->connected_devices = g_slist_remove(la->connected_devices, condev); |
| g_free(condev); |
| } |
| |
| static void link_loss_disc_cb(gpointer user_data) |
| { |
| struct connected_device *condev = user_data; |
| |
| DBG("alert loss disconnect device %p", condev->device); |
| |
| /* if an alert-level is set, emit a signal */ |
| if (condev->alert_level != NO_ALERT) |
| link_loss_emit_alert_signal(condev); |
| |
| /* we are open for more changes now */ |
| link_loss_remove_condev(condev); |
| } |
| |
| static void link_loss_local_disc(struct btd_device *device, |
| gboolean removal, void *user_data) |
| { |
| struct connected_device *condev = user_data; |
| |
| /* no need to alert on this device - we requested disconnection */ |
| link_loss_remove_condev(condev); |
| |
| DBG("alert level zeroed for locally disconnecting dev %p", device); |
| } |
| |
| static uint8_t link_loss_alert_lvl_write(struct attribute *a, |
| struct btd_device *device, gpointer user_data) |
| { |
| uint8_t value; |
| struct link_loss_adapter *la = user_data; |
| struct connected_device *condev = NULL; |
| |
| if (!device) |
| goto set_error; |
| |
| /* condev might remain NULL here if nothing is found */ |
| condev = find_connected_device(la, device); |
| |
| if (a->len == 0) { |
| DBG("Illegal alert level length"); |
| goto set_error; |
| } |
| |
| value = a->data[0]; |
| if (value != NO_ALERT && value != MILD_ALERT && value != HIGH_ALERT) { |
| DBG("Illegal alert value"); |
| goto set_error; |
| } |
| |
| /* Register a disconnect cb if the alert level is non-zero */ |
| if (value != NO_ALERT && !condev) { |
| condev = g_new0(struct connected_device, 1); |
| condev->device = btd_device_ref(device); |
| condev->adapter = la; |
| condev->callback_id = btd_device_add_attio_callback(device, |
| NULL, link_loss_disc_cb, condev); |
| condev->local_disc_id = device_add_disconnect_watch(device, |
| link_loss_local_disc, condev, NULL); |
| |
| la->connected_devices = g_slist_append(la->connected_devices, |
| condev); |
| } else if (value == NO_ALERT && condev) { |
| link_loss_remove_condev(condev); |
| condev = NULL; |
| } |
| |
| DBG("alert level set to %d by device %p", value, device); |
| |
| if (condev) |
| condev->alert_level = value; |
| |
| return 0; |
| |
| set_error: |
| error("Set link loss alert level for dev %p", device); |
| /* reset alert level on erroneous devices */ |
| link_loss_remove_condev(condev); |
| return ATT_ECODE_IO; |
| } |
| |
| void link_loss_register(struct btd_adapter *adapter) |
| { |
| gboolean svc_added; |
| bt_uuid_t uuid; |
| struct link_loss_adapter *lladapter; |
| |
| bt_uuid16_create(&uuid, LINK_LOSS_SVC_UUID); |
| |
| lladapter = g_new0(struct link_loss_adapter, 1); |
| lladapter->adapter = adapter; |
| |
| link_loss_adapters = g_slist_append(link_loss_adapters, lladapter); |
| |
| /* Link Loss Service */ |
| svc_added = gatt_service_add(adapter, |
| GATT_PRIM_SVC_UUID, &uuid, |
| /* Alert level characteristic */ |
| GATT_OPT_CHR_UUID, ALERT_LEVEL_CHR_UUID, |
| GATT_OPT_CHR_PROPS, |
| ATT_CHAR_PROPER_READ | ATT_CHAR_PROPER_WRITE, |
| GATT_OPT_CHR_VALUE_CB, ATTRIB_READ, |
| link_loss_alert_lvl_read, lladapter, |
| GATT_OPT_CHR_VALUE_CB, ATTRIB_WRITE, |
| link_loss_alert_lvl_write, lladapter, |
| GATT_OPT_CHR_VALUE_GET_HANDLE, |
| &lladapter->alert_lvl_value_handle, |
| GATT_OPT_INVALID); |
| |
| if (!svc_added) |
| goto err; |
| |
| DBG("Link Loss service added"); |
| return; |
| |
| err: |
| error("Error adding Link Loss service"); |
| link_loss_unregister(adapter); |
| } |
| |
| static void remove_condev_list_item(gpointer data, gpointer user_data) |
| { |
| struct connected_device *condev = data; |
| |
| link_loss_remove_condev(condev); |
| } |
| |
| void link_loss_unregister(struct btd_adapter *adapter) |
| { |
| struct link_loss_adapter *lladapter; |
| lladapter = find_link_loss_adapter(adapter); |
| if (!lladapter) |
| return; |
| |
| g_slist_foreach(lladapter->connected_devices, remove_condev_list_item, |
| NULL); |
| |
| link_loss_adapters = g_slist_remove(link_loss_adapters, lladapter); |
| g_free(lladapter); |
| } |