se401_get_feature
se401_get_feature(gspca_dev, HV7131_REG_HIREFNOH);
se401_get_feature(gspca_dev, HV7131_REG_HIREFNOL);
se401_get_feature(gspca_dev, HV7131_REG_LOREFNOH);
se401_get_feature(gspca_dev, HV7131_REG_LOREFNOL);
ahrc = 256*se401_get_feature(gspca_dev, HV7131_REG_HIREFNOH) +
se401_get_feature(gspca_dev, HV7131_REG_HIREFNOL);
alrc = 256*se401_get_feature(gspca_dev, HV7131_REG_LOREFNOH) +
se401_get_feature(gspca_dev, HV7131_REG_LOREFNOL);