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/*
* Android BLE Library -- Provides utility functions to control BLE features
*
* Copyright (C) 2013 João Paulo Rechi Vita
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of the
* the Free Software Foundation; either version 2 of the License, or
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <hardware/bluetooth.h>
#include <hardware/bt_gatt.h>
#include <hardware/bt_gatt_client.h>
#include <hardware/hardware.h>
#include "ble.h"
/* Data that have to be acessable by the callbacks */
static struct libdata {
ble_cbs_t cbs;
uint8_t btiface_initialized;
const bt_interface_t *btiface;
const btgatt_interface_t *gattiface;
int client;
uint8_t adapter_state;
} data;
/* Called when the client registration is finished */
static void register_client_cb(int status, int client_if, bt_uuid_t *app_uuid) {
if (status == BT_STATUS_SUCCESS) {
data.client = client_if;
if (data.cbs.enable_cb)
data.cbs.enable_cb();
} else
data.client = 0;
}
/* GATT client interface callbacks */
static const btgatt_client_callbacks_t gattccbs = {
register_client_cb,
NULL, /* scan_result_cb */
NULL, /* connect_cb */
NULL, /* disconnect_cb */
NULL, /* search_complete_cb */
NULL, /* search_result_cb */
NULL, /* get_characteristic_cb */
NULL, /* get_descriptor_cb */
NULL, /* get_included_service_cb */
NULL, /* register_for_notification_cb */
NULL, /* notify_cb */
NULL, /* read_characteristic_cb */
NULL, /* write_characteristic_cb */
NULL, /* read_descriptor_cb */
NULL, /* write_descriptor_cb */
NULL, /* execute_write_cb */
NULL, /* read_remote_rssi_cb */
};
/* GATT interface callbacks */
static const btgatt_callbacks_t gattcbs = {
sizeof(btgatt_callbacks_t),
&gattccbs,
NULL /* btgatt_server_callbacks_t */
};
/* Called every time the adapter state changes */
static void adapter_state_changed_cb(bt_state_t state) {
/* Arbitrary UUID used to identify this application with the GATT profile */
bt_uuid_t app_uuid = { .uu = { 0x1b, 0x1c, 0xb9, 0x2e, 0x0d, 0x2e, 0x4c,
0x45, 0xbb, 0xb8, 0xf4, 0x1b, 0x46, 0x39,
0x23, 0x36 } };
data.adapter_state = state == BT_STATE_ON ? 1 : 0;
if (data.cbs.adapter_state_cb)
data.cbs.adapter_state_cb(data.adapter_state);
if (data.adapter_state) {
bt_status_t s = data.gattiface->client->register_client(&app_uuid);
if (s != BT_STATUS_SUCCESS)
data.btiface->disable();
} else
/* Cleanup the Bluetooth interface */
data.btiface->cleanup();
}
/* This callback is called when the stack finishes initialization / shutdown */
static void thread_event_cb(bt_cb_thread_evt event) {
bt_status_t s;
if (event == DISASSOCIATE_JVM) {
data.btiface_initialized = 0;
return;
}
data.btiface_initialized = 1;
data.gattiface = data.btiface->get_profile_interface(BT_PROFILE_GATT_ID);
if (data.gattiface != NULL) {
s = data.gattiface->init(&gattcbs);
if (s != BT_STATUS_SUCCESS)
data.gattiface = NULL;
}
/* Enable the adapter */
s = data.btiface->enable();
if (s != BT_STATUS_SUCCESS)
data.btiface->cleanup();
}
/* Bluetooth interface callbacks */
static bt_callbacks_t btcbs = {
sizeof(bt_callbacks_t),
adapter_state_changed_cb,
NULL, /* adapter_properties_cb */
NULL, /* remote_device_properties_callback */
NULL, /* device_found_cb */
NULL, /* discovery_state_changed_cb */
NULL, /* pin_request_cb */
NULL, /* ssp_request_cb */
NULL, /* bond_state_changed_cb */
NULL, /* acl_state_changed_callback */
thread_event_cb,
NULL, /* dut_mode_recv_callback */
NULL, /* le_test_mode_callback */
};
int ble_enable(ble_cbs_t cbs) {
int status;
bt_status_t s;
hw_module_t *module;
hw_device_t *hwdev;
bluetooth_device_t *btdev;
memset(&data, 0, sizeof(data));
/* Get the Bluetooth module from libhardware */
status = hw_get_module(BT_STACK_MODULE_ID, (hw_module_t const**) &module);
if (status < 0)
return status;
/* Get the Bluetooth hardware device */
status = module->methods->open(module, BT_STACK_MODULE_ID, &hwdev);
if (status < 0)
return status;
/* Get the Bluetooth interface */
btdev = (bluetooth_device_t *) hwdev;
data.btiface = btdev->get_bluetooth_interface();
if (data.btiface == NULL)
return -1;
/* Init the Bluetooth interface, setting a callback for each operation */
s = data.btiface->init(&btcbs);
if (s != BT_STATUS_SUCCESS && s != BT_STATUS_DONE)
return -s;
/* Store the user callbacks */
data.cbs = cbs;
return 0;
}
int ble_disable() {
bt_status_t s;
if (!data.adapter_state)
return -1;
if (!data.btiface)
return -1;
if (!data.client)
return -1;
s = data.gattiface->client->unregister_client(data.client);
if (s != BT_STATUS_SUCCESS)
return -s;
s = data.btiface->disable();
if (s != BT_STATUS_SUCCESS)
return -s;
return 0;
}
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