fsg_from_func
struct fsg_dev *fsg = fsg_from_func(f);
struct fsg_dev *fsg = fsg_from_func(f);
struct fsg_dev *fsg = fsg_from_func(f);
struct fsg_dev *fsg = fsg_from_func(f);
struct fsg_dev *fsg = fsg_from_func(f);