PAGE_SEL_REG
error = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8);
error = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8);
error = i2c_smbus_write_byte_data(client, PAGE_SEL_REG, reg >> 8);