REG_PAGE_SWITCH
ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);
ret = i2c_smbus_write_byte_data(client, REG_PAGE_SWITCH, REG_ENABLE);