AD7998_CYCLE_TMR_REG
int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,