camera_module_t *rawModule;
/*** NOTE THIS ***/
int err = hw_get_module(CAMERA_HARDWARE_MODULE_ID, (const hw_module_t **)&rawModule);
First rawModule Is a pointer , that &rawModule Is the address of the pointer , I.e. secondary pointer
(const hw_module_t **)&rawModule Express camera_module_t Properties in a class hw_module_t common;