WifiService(java进程)通过IWifi.hal HIDL接口调用到C++端的Wifi.cpp
WifiStatus Wifi::startInternal() {
if (run_state_ == RunState::STARTED) {
return createWifiStatus(WifiStatusCode::SUCCESS);
} else if (run_state_ == RunState::STOPPING) {
return createWifiStatus(WifiStatusCode::ERROR_NOT_AVAILABLE,
"HAL is stopping");
}
//初始化WifiModeController和LegacyHal
WifiStatus wifi_status = initializeModeControllerAndLegacyHal();
if (wifi_status.code == WifiStatusCode::SUCCESS) {
// Create the chip instance once the HAL is started.
chip_ = new WifiChip(kChipId, legacy_hal_, mode_controller_,
feature_flags_);
run_state_ = RunState::STARTED;
for (const auto& callback : event_cb_handler_.getCallbacks()) {
if (!callback->onStart().isOk()) {
LOG(ERROR) << "Failed to invoke onStart callback";
};
}
LOG(INFO) << "Wifi HAL started";
} else {
for (const auto& callback : event_cb_handler_.getCallbacks()) {
if (!callback->onFailure(wifi_status).isOk()) {
LOG(ERROR) << "Failed to invoke onFailure callback";
}
}
LOG(ERROR) << "Wifi HAL start failed";
}
return wifi_status;
}
WifiStatus Wifi::initializeModeControllerAndLegacyHal() {
if (!mode_controller_->initialize()) {
LOG(ERROR) << "Failed to initialize firmware mode controller";
return createWifiStatus(WifiStatusCode::ERROR_UNKNOWN);
}
legacy_hal::wifi_error legacy_status = legacy_hal_->initialize();
if (legacy_status != legacy_hal::WIFI_SUCCESS) {
LOG(ERROR) << "Failed to initialize legacy HAL: "
<< legacyErrorToString(legacy_status);
return createWifiStatusFromLegacyError(legacy_status);
}
return createWifiStatus(WifiStatusCode::SUCCESS);
}
bool WifiModeController::initialize() {
if (!driver_tool_->LoadDriver()) {
LOG(ERROR) << "Failed to load WiFi driver";
return false;
}
return true;
}
bool DriverTool::LoadDriver() {
return ::wifi_load_driver() == 0;
}
wifi_hal_common.cpp
int wifi_unload_driver() {
if (!is_wifi_driver_loaded()) {//检查driver是否有加载
return 0;
}
usleep(200000); /* allow to finish interface down */
#ifdef WIFI_DRIVER_MODULE_PATH
if (rmmod(DRIVER_MODULE_NAME) == 0) {
int count = 20; /* wait at most 10 seconds for completion */
while (count-- > 0) {
if (!is_wifi_driver_loaded()) break;
usleep(500000);
}
usleep(500000); /* allow card removal */
if (count) {
return 0;
}
return -1;
} else
return -1;
#else
#ifdef WIFI_DRIVER_STATE_CTRL_PARAM
if (is_wifi_driver_loaded()) {
if (wifi_change_driver_state(WIFI_DRIVER_STATE_OFF) < 0) return -1;
}
#endif
property_set(DRIVER_PROP_NAME, "unloaded");
return 0;
#endif
}
int is_wifi_driver_loaded() {
char driver_status[PROPERTY_VALUE_MAX];
#ifdef WIFI_DRIVER_MODULE_PATH
FILE *proc;
char line[sizeof(DRIVER_MODULE_TAG) + 10];
#endif
if (!property_get(DRIVER_PROP_NAME, driver_status, NULL) ||
strcmp(driver_status, "ok") != 0) {
return 0; /* driver not loaded */
}
#ifdef WIFI_DRIVER_MODULE_PATH
/*
* If the property says the driver is loaded, check to
* make sure that the property setting isn't just left
* over from a previous manual shutdown or a runtime
* crash.
*/
if ((proc = fopen(MODULE_FILE, "r")) == NULL) {
PLOG(WARNING) << "Could not open " << MODULE_FILE;
property_set(DRIVER_PROP_NAME, "unloaded");
return 0;
}
while ((fgets(line, sizeof(line), proc)) != NULL) {
if (strncmp(line, DRIVER_MODULE_TAG, strlen(DRIVER_MODULE_TAG)) == 0) {
fclose(proc);
return 1;
}
}
fclose(proc);
property_set(DRIVER_PROP_NAME, "unloaded");
return 0;
#else
return 1;
#endif
}
wifi_error WifiLegacyHal::initialize() {
LOG(DEBUG) << "Initialize legacy HAL";
// TODO: Add back the HAL Tool if we need to. All we need from the HAL tool
// for now is this function call which we can directly call.
if (!initHalFuncTableWithStubs(&global_func_table_)) { //wifi_legacy_hal_stubs.cpp加载函数列表
LOG(ERROR)
<< "Failed to initialize legacy hal function table with stubs";
return WIFI_ERROR_UNKNOWN;
}
wifi_error status = init_wifi_vendor_hal_func_table(&global_func_table_);///hardware/qcom/wlan/qcwcn/wifi_hal/wifi_hal.cpp 中加载函数列表
if (status != WIFI_SUCCESS) {
LOG(ERROR) << "Failed to initialize legacy hal function table";
}
return status;
}