PCA963X_MODE2
mode2 = i2c_smbus_read_byte_data(client, PCA963X_MODE2);
i2c_smbus_write_byte_data(client, PCA963X_MODE2,
mode2 = i2c_smbus_read_byte_data(client, PCA963X_MODE2);
ret = i2c_smbus_write_byte_data(client, PCA963X_MODE2, mode2);