status_t CameraFlashlight::setTorchMode(const String8& cameraId, bool enabled) {
if (!mFlashlightMapInitialized) {
ALOGE("%s: findFlashUnits() must be called before this method.",
__FUNCTION__);
return NO_INIT;
}
ALOGV("%s: set torch mode of camera %s to %d", __FUNCTION__,
cameraId.string(), enabled);
status_t res = OK;
Mutex::Autolock l(mLock);
if (mOpenedCameraIds.indexOf(cameraId) != NAME_NOT_FOUND) {
// This case is needed to avoid state corruption during the following call sequence:
// CameraService::setTorchMode for camera ID 0 begins, does torch status checks
// CameraService::connect for camera ID 0 begins, calls prepareDeviceOpen, ends
// CameraService::setTorchMode for camera ID 0 continues, calls
// CameraFlashlight::setTorchMode
// TODO: Move torch status checks and state updates behind this CameraFlashlight lock
// to avoid other similar race conditions.
ALOGE("%s: Camera device %s is in use, cannot set torch mode.",
__FUNCTION__, cameraId.string());
return -EBUSY;
}
if (mFlashControl == NULL) {
if (enabled == false) {
return OK;
}
res = createFlashlightControl(cameraId);
if (res) {
return res;
}
res = mFlashControl->setTorchMode(cameraId, enabled);
return res;
}
// if flash control already exists, turning on torch mode may fail if it's
// tied to another camera device for module v2.3 and below.
res = mFlashControl->setTorchMode(cameraId, enabled);
if (res == BAD_INDEX) {
// flash control is tied to another camera device, need to close it and
// try again.
mFlashControl.clear();
res = createFlashlightControl(cameraId);
if (res) {
return res;
}
res = mFlashControl->setTorchMode(cameraId, enabled);
}
return res;
}
status_t CameraFlashlight::findFlashUnits() {
Mutex::Autolock l(mLock);
status_t res;
int32_t numCameras = mCameraModule->getNumberOfCameras();
mHasFlashlightMap.clear();
mFlashlightMapInitialized = false;
for (int32_t i = 0; i < numCameras; i++) {
bool hasFlash = false;
String8 id = String8::format("%d", i);
res = createFlashlightControl(id);
if (res) {
ALOGE("%s: failed to create flash control for %s", __FUNCTION__,
id.string());
} else {
res = mFlashControl->hasFlashUnit(id, &hasFlash);
if (res == -EUSERS || res == -EBUSY) {
ALOGE("%s: failed to check if camera %s has a flash unit. Some "
"camera devices may be opened", __FUNCTION__,
id.string());
return res;
} else if (res) {
ALOGE("%s: failed to check if camera %s has a flash unit. %s"
" (%d)", __FUNCTION__, id.string(), strerror(-res),
res);
}
mFlashControl.clear();
}
mHasFlashlightMap.add(id, hasFlash);
}
mFlashlightMapInitialized = true;
return OK;
}
