i2c: Add IDs to adapters

IDs have been defined but not used by most of the I2C adapters.
By having a unique ID, clients can check for correct connection
during probe.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/i2c/busses/i2c-piix4.c

@@ -384,6 +384,7 @@ static const struct i2c_algorithm smbus_algorithm = {
 
 static struct i2c_adapter piix4_adapter = {
 	.owner		= THIS_MODULE,
+	.id		= I2C_HW_SMBUS_PIIX4,
 	.class		= I2C_CLASS_HWMON,
 	.algo		= &smbus_algorithm,
 };