MAX1619_REG_CONVRATE
ret = regmap_read(regmap, MAX1619_REG_CONVRATE, ®val);
return regmap_write(regmap, MAX1619_REG_CONVRATE, val);
regval = i2c_smbus_read_byte_data(client, MAX1619_REG_CONVRATE);
ret = regmap_write(regmap, MAX1619_REG_CONVRATE, 5); /* 2 Hz */