static unsigned int pca_probe_chip(struct i2c_adapter *adap)
{
struct i2c_algo_pca_data *pca_data = adap->algo_data;
/* The trick here is to check if there is an indirect register
* available. If there is one, we will read the value we first
* wrote on I2C_PCA_IADR. Otherwise, we will read the last value
* we wrote on I2C_PCA_ADR
*/
pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_IADR);
pca_outw(pca_data, I2C_PCA_IND, 0xAA);
pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_ITO);
pca_outw(pca_data, I2C_PCA_IND, 0x00);
pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_IADR);
if (pca_inw(pca_data, I2C_PCA_IND) == 0xAA) {
;
return I2C_PCA_CHIP_9665;
} else {
;
return I2C_PCA_CHIP_9564;
}
}
static void pca_rx_byte(struct i2c_algo_pca_data *adap,
__u8 *b, int ack)
{
*b = pca_inw(adap, I2C_PCA_DAT);
DEB2("=== READ %#04x %s\n", *b, ack ? "ACK" : "NACK");
}
