ov534_reg_read
data = ov534_reg_read(gspca_dev, 0x21);
data = ov534_reg_read(gspca_dev, 0x23);
data = ov534_reg_read(gspca_dev, 0x21);
data = ov534_reg_read(gspca_dev, OV534_REG_STATUS);
return ov534_reg_read(gspca_dev, OV534_REG_READ);