lp3971_i2c_read
lp3971_i2c_read(lp3971->i2c, reg, 1, &val);
ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);