Input: factor out and export input_device_id matching code

Factor out and export input_match_device_id() so that modules may use it.
It will be needed by joydev to blacklist accelerometers in composite
devices.
Tested-by: Roderick Colenbrander <roderick.colenbrander@sony.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/input.c

@@ -933,59 +933,52 @@ int input_set_keycode(struct input_dev *dev,
 }
 EXPORT_SYMBOL(input_set_keycode);
 
-static const struct input_device_id *input_match_device(struct input_handler *handler,
-							struct input_dev *dev)
+bool input_match_device_id(const struct input_dev *dev,
+			   const struct input_device_id *id)
 {
-	const struct input_device_id *id;
-
-	for (id = handler->id_table; id->flags || id->driver_info; id++) {
-
 	if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
 		if (id->bustype != dev->id.bustype)
-				continue;
+			return false;
 
 	if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
 		if (id->vendor != dev->id.vendor)
-				continue;
+			return false;
 
 	if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
 		if (id->product != dev->id.product)
-				continue;
+			return false;
 
 	if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
 		if (id->version != dev->id.version)
-				continue;
-
-		if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX))
-			continue;
-
-		if (!bitmap_subset(id->keybit, dev->keybit, KEY_MAX))
-			continue;
-
-		if (!bitmap_subset(id->relbit, dev->relbit, REL_MAX))
-			continue;
+			return false;
 
-		if (!bitmap_subset(id->absbit, dev->absbit, ABS_MAX))
-			continue;
-
-		if (!bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX))
-			continue;
-
-		if (!bitmap_subset(id->ledbit, dev->ledbit, LED_MAX))
-			continue;
-
-		if (!bitmap_subset(id->sndbit, dev->sndbit, SND_MAX))
-			continue;
+	if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX) ||
+	    !bitmap_subset(id->keybit, dev->keybit, KEY_MAX) ||
+	    !bitmap_subset(id->relbit, dev->relbit, REL_MAX) ||
+	    !bitmap_subset(id->absbit, dev->absbit, ABS_MAX) ||
+	    !bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX) ||
+	    !bitmap_subset(id->ledbit, dev->ledbit, LED_MAX) ||
+	    !bitmap_subset(id->sndbit, dev->sndbit, SND_MAX) ||
+	    !bitmap_subset(id->ffbit, dev->ffbit, FF_MAX) ||
+	    !bitmap_subset(id->swbit, dev->swbit, SW_MAX)) {
+		return false;
+	}
 
-		if (!bitmap_subset(id->ffbit, dev->ffbit, FF_MAX))
-			continue;
+	return true;
+}
+EXPORT_SYMBOL(input_match_device_id);
 
-		if (!bitmap_subset(id->swbit, dev->swbit, SW_MAX))
-			continue;
+static const struct input_device_id *input_match_device(struct input_handler *handler,
+							struct input_dev *dev)
+{
+	const struct input_device_id *id;
 
-		if (!handler->match || handler->match(handler, dev))
+	for (id = handler->id_table; id->flags || id->driver_info; id++) {
+		if (input_match_device_id(dev, id) &&
+		    (!handler->match || handler->match(handler, dev))) {
 			return id;
 		}
+	}
 
 	return NULL;
 }

include/linux/input.h

@@ -469,6 +469,9 @@ int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke);
 int input_set_keycode(struct input_dev *dev,
 		      const struct input_keymap_entry *ke);
 
+bool input_match_device_id(const struct input_dev *dev,
+			   const struct input_device_id *id);
+
 void input_enable_softrepeat(struct input_dev *dev, int delay, int period);
 
 extern struct class input_class;