[PATCH] Make sure therm_adt746x only handles known hardware

This patch limits therm_adt746x to currently existing fan controllers in
Apple laptops.  It may avoid problems with future hardware.
Signed-off-by: NColin Leroy <colin@colino.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

drivers/macintosh/therm_adt746x.c

@@ -545,6 +545,12 @@ thermostat_init(void)
 	else
 		return -ENODEV;
 
+	prop = (u32 *)get_property(np, "hwsensor-params-version", NULL);
+	printk(KERN_INFO "adt746x: version %d (%ssupported)\n", *prop,
+			 (*prop == 1)?"":"un");
+	if (*prop != 1)
+		return -ENODEV;
+
 	prop = (u32 *)get_property(np, "reg", NULL);
 	if (!prop)
 		return -ENODEV;