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246 lines
8.3 KiB
246 lines
8.3 KiB
/*
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* Copyright 2020 HIMSA II K/S - www.himsa.com.
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* Represented by EHIMA - www.ehima.com
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <map>
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#include <vector>
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#include "bta_gatt_api.h"
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#include "bta_gatt_queue.h"
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#include "devices.h"
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#include "gatt_api.h"
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#include "stack/btm/btm_sec.h"
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using namespace bluetooth::vc::internal;
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void VolumeControlDevice::Disconnect(tGATT_IF gatt_if) {
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LOG(INFO) << __func__ << ": " << this->ToString();
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if (IsConnected()) {
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if (volume_state_handle != 0)
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BTA_GATTC_DeregisterForNotifications(gatt_if, address,
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volume_state_handle);
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if (volume_flags_handle != 0)
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BTA_GATTC_DeregisterForNotifications(gatt_if, address,
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volume_flags_handle);
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BtaGattQueue::Clean(connection_id);
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BTA_GATTC_Close(connection_id);
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connection_id = GATT_INVALID_CONN_ID;
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} else {
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BTA_GATTC_CancelOpen(gatt_if, address, false);
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}
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device_ready = false;
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handles_pending.clear();
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}
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/*
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* Find the handle for the client characteristics configuration of a given
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* characteristics
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*/
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uint16_t VolumeControlDevice::find_ccc_handle(uint16_t chrc_handle) {
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const gatt::Characteristic* p_char =
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BTA_GATTC_GetCharacteristic(connection_id, chrc_handle);
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if (!p_char) {
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LOG(WARNING) << __func__ << ": no such handle=" << loghex(chrc_handle);
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return 0;
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}
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for (const gatt::Descriptor& desc : p_char->descriptors) {
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if (desc.uuid == Uuid::From16Bit(GATT_UUID_CHAR_CLIENT_CONFIG))
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return desc.handle;
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}
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return 0;
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}
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bool VolumeControlDevice::set_volume_control_service_handles(
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const gatt::Service& service) {
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uint16_t state_handle = 0, state_ccc_handle = 0, control_point_handle = 0,
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flags_handle = 0, flags_ccc_handle = 0;
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for (const gatt::Characteristic& chrc : service.characteristics) {
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if (chrc.uuid == kVolumeControlStateUuid) {
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state_handle = chrc.value_handle;
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state_ccc_handle = find_ccc_handle(chrc.value_handle);
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} else if (chrc.uuid == kVolumeControlPointUuid) {
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control_point_handle = chrc.value_handle;
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} else if (chrc.uuid == kVolumeFlagsUuid) {
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flags_handle = chrc.value_handle;
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flags_ccc_handle = find_ccc_handle(chrc.value_handle);
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} else {
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LOG(WARNING) << __func__ << ": unknown characteristic=" << chrc.uuid;
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}
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}
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// Validate service handles
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if (GATT_HANDLE_IS_VALID(state_handle) &&
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GATT_HANDLE_IS_VALID(state_ccc_handle) &&
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GATT_HANDLE_IS_VALID(control_point_handle) &&
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GATT_HANDLE_IS_VALID(flags_handle)
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/* volume_flags_ccc_handle is optional */) {
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volume_state_handle = state_handle;
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volume_state_ccc_handle = state_ccc_handle;
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volume_control_point_handle = control_point_handle;
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volume_flags_handle = flags_handle;
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volume_flags_ccc_handle = flags_ccc_handle;
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return true;
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}
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return false;
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}
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bool VolumeControlDevice::UpdateHandles(void) {
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ResetHandles();
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bool vcs_found = false;
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const std::list<gatt::Service>* services =
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BTA_GATTC_GetServices(connection_id);
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if (services == nullptr) {
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LOG(ERROR) << "No services found";
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return false;
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}
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for (auto const& service : *services) {
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if (service.uuid == kVolumeControlUuid) {
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LOG(INFO) << "Found VCS, handle=" << loghex(service.handle);
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vcs_found = set_volume_control_service_handles(service);
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if (!vcs_found) break;
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}
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}
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return vcs_found;
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}
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void VolumeControlDevice::ResetHandles(void) {
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device_ready = false;
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// the handles are not valid, so discard pending GATT operations
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BtaGattQueue::Clean(connection_id);
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volume_state_handle = 0;
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volume_state_ccc_handle = 0;
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volume_control_point_handle = 0;
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volume_flags_handle = 0;
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volume_flags_ccc_handle = 0;
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}
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void VolumeControlDevice::ControlPointOperation(uint8_t opcode,
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const std::vector<uint8_t>* arg,
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GATT_WRITE_OP_CB cb,
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void* cb_data) {
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std::vector<uint8_t> set_value({opcode, change_counter});
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if (arg != nullptr)
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set_value.insert(set_value.end(), (*arg).begin(), (*arg).end());
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BtaGattQueue::WriteCharacteristic(connection_id, volume_control_point_handle,
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set_value, GATT_WRITE, cb, cb_data);
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}
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bool VolumeControlDevice::subscribe_for_notifications(tGATT_IF gatt_if,
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uint16_t handle,
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uint16_t ccc_handle,
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GATT_WRITE_OP_CB cb) {
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tGATT_STATUS status =
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BTA_GATTC_RegisterForNotifications(gatt_if, address, handle);
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if (status != GATT_SUCCESS) {
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LOG(ERROR) << __func__ << ": failed, status=" << loghex(+status);
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return false;
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}
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std::vector<uint8_t> value(2);
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uint8_t* ptr = value.data();
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UINT16_TO_STREAM(ptr, GATT_CHAR_CLIENT_CONFIG_NOTIFICATION);
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BtaGattQueue::WriteDescriptor(connection_id, ccc_handle, std::move(value),
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GATT_WRITE, cb, nullptr);
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return true;
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}
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/**
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* Enqueue GATT requests that are required by the Volume Control to be
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* functional. This includes State characteristics read and subscription.
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* Those characteristics contain the change counter needed to send any request
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* via Control Point. Once completed successfully, the device can be stored
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* and reported as connected. In each case we subscribe first to be sure we do
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* not miss any value change.
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*/
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bool VolumeControlDevice::EnqueueInitialRequests(
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tGATT_IF gatt_if, GATT_READ_OP_CB chrc_read_cb,
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GATT_WRITE_OP_CB cccd_write_cb) {
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handles_pending.clear();
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handles_pending.insert(volume_state_handle);
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handles_pending.insert(volume_state_ccc_handle);
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if (!subscribe_for_notifications(gatt_if, volume_state_handle,
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volume_state_ccc_handle, cccd_write_cb)) {
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return false;
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}
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BtaGattQueue::ReadCharacteristic(connection_id, volume_state_handle,
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chrc_read_cb, nullptr);
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return true;
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}
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/**
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* Enqueue the remaining requests. Those are not so crucial and can be done
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* once Volume Control instance indicates it's readiness to profile.
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* This includes characteristics read and subscription.
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* In each case we subscribe first to be sure we do not miss any value change.
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*/
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void VolumeControlDevice::EnqueueRemainingRequests(
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tGATT_IF gatt_if, GATT_READ_OP_CB chrc_read_cb,
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GATT_WRITE_OP_CB cccd_write_cb) {
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std::map<uint16_t, uint16_t> handle_pairs{
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{volume_flags_handle, volume_flags_ccc_handle},
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};
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for (auto const& handles : handle_pairs) {
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if (GATT_HANDLE_IS_VALID(handles.second)) {
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subscribe_for_notifications(gatt_if, handles.first, handles.second,
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cccd_write_cb);
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}
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BtaGattQueue::ReadCharacteristic(connection_id, handles.first, chrc_read_cb,
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nullptr);
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}
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}
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bool VolumeControlDevice::VerifyReady(uint16_t handle) {
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handles_pending.erase(handle);
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device_ready = handles_pending.size() == 0;
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return device_ready;
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}
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bool VolumeControlDevice::IsEncryptionEnabled() {
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uint8_t sec_flag = 0;
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bool device_found =
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BTM_GetSecurityFlagsByTransport(address, &sec_flag, BT_TRANSPORT_LE);
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LOG(INFO) << __func__ << ": found=" << static_cast<int>(device_found)
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<< " sec_flag=" << loghex(sec_flag);
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return device_found && (sec_flag & BTM_SEC_FLAG_ENCRYPTED);
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}
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bool VolumeControlDevice::EnableEncryption(tBTM_SEC_CALLBACK* callback) {
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int result = BTM_SetEncryption(address, BT_TRANSPORT_LE, callback, nullptr,
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BTM_BLE_SEC_ENCRYPT);
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LOG(INFO) << __func__ << ": result=" << +result;
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// TODO: should we care about the result??
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return true;
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}
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