I2C_PCA_CON
#define pca_set_con(adap, val) pca_outw(adap, I2C_PCA_CON, val)
#define pca_get_con(adap) pca_inw(adap, I2C_PCA_CON)
pca_isa_readbyte(pd, I2C_PCA_CON)
if (pca_isa_readbyte(pd, I2C_PCA_CON)
if ((i2c->algo_data.read_byte(i2c, I2C_PCA_CON) & I2C_PCA_CON_SI) == 0)
i2c->algo_data.read_byte(i2c, I2C_PCA_CON)
if (i2c->algo_data.read_byte(i2c, I2C_PCA_CON)