[PATCH] I2C: i2c-isa functionality

The "functionality" return was incorrectly removed for i2c-isa.c when porting to 2.5.
A driver that does nothing must return a 0 or else i2c-core assumes
0xffffffff (all functionality).

drivers/i2c/busses/i2c-isa.c

@@ -30,10 +30,13 @@
 #include <linux/errno.h>
 #include <linux/i2c.h>
 
+static u32 isa_func(struct i2c_adapter *adapter);
+
 /* This is the actual algorithm we define */
 static struct i2c_algorithm isa_algorithm = {
 	.name		= "ISA bus algorithm",
 	.id		= I2C_ALGO_ISA,
+	.functionality	= isa_func,
 };
 
 /* There can only be one... */
@@ -45,6 +48,12 @@ static struct i2c_adapter isa_adapter = {
 	.name		= "ISA main adapter",
 };
 
+/* We can't do a thing... */
+static u32 isa_func(struct i2c_adapter *adapter)
+{
+	return 0;
+}
+
 static int __init i2c_isa_init(void)
 {
 	return i2c_add_adapter(&isa_adapter);