sensor_write_reg
rc = sensor_write_reg(gspca_dev, data[i].reg, data[i].flags,
rc = sensor_write_reg(gspca_dev, reg, 0x01, &buf, 1);
rc = sensor_write_reg(gspca_dev, reg, 0x00, &buf, 1);
rc = sensor_write_reg(gspca_dev, confirm_reg, 0x00, &buf, 1);
sensor_write_reg(gspca_dev, 0x0e, 0, buf, 2);