iqs5xx_write_byte
error1 = iqs5xx_write_byte(client, IQS5XX_SYS_CTRL1, state);
error2 = iqs5xx_write_byte(client, IQS5XX_END_COMM, 0);
error = iqs5xx_write_byte(client, IQS5XX_SYS_CTRL0, IQS5XX_ACK_RESET);
error = iqs5xx_write_byte(client, IQS5XX_SYS_CFG0,
error = iqs5xx_write_byte(client, IQS5XX_SYS_CFG1,
error = iqs5xx_write_byte(client, IQS5XX_END_COMM, 0);
error = iqs5xx_write_byte(client, IQS5XX_END_COMM, 0);