[PATCH] serio_for_each_port() -- for serio hijacking

[Zinx Verituse <zinx@epicsol.org>]

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Well, this is the best method I could think of for rescanning
the serio devices.  I don't know if the overhead for function
calls is acceptable, or even if this functionality is desired.

Anyway, this is for questions and comments.

WARNING: Untested code, but I'm resonably sure it works ;)

-- 
Zinx Verituse

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diff -ru linux-2.6.0-test9.orig/drivers/input/serio/serio.c linux-2.6.0-test9/drivers/input/serio/serio.c
--- linux-2.6.0-test9.orig/drivers/input/serio/serio.c	2003-10-25 13:42:48.000000000 -0500
+++ linux-2.6.0-test9/drivers/input/serio/serio.c	2003-11-18 12:23:46.000000000 -0600
@@ -28,6 +28,9 @@
  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  *
  * Changes:
+ * 18 Nov. 2003    Zinx Verituse <zinx@epicsol.org>
+ *                 serio_for_each_port()
+ *
  * 20 Jul. 2003    Daniele Bellucci <bellucda@tiscali.it>
  *                 Minor cleanups.
  */
@@ -57,6 +60,7 @@
 EXPORT_SYMBOL(serio_open);
 EXPORT_SYMBOL(serio_close);
 EXPORT_SYMBOL(serio_rescan);
+EXPORT_SYMBOL(serio_for_each_port);
 
 struct serio_event {
 	int type;
@@ -244,6 +248,27 @@
 	serio->dev = NULL;
 }
 
+/*
+ * called without serio_sem locked
+ * func() should return non-zero to exit the for_each
+ * the last return value of func() is returned by serio_for_each_func
+ */
+int serio_for_each_port(int (*func)(struct serio*))
+{
+	struct serio *serio;
+	int retval;
+
+	down(&serio_sem);
+	list_for_each_entry(serio, &serio_list, node) {
+		retval = func(serio);
+		if (retval)
+			break;
+	}
+	up(&serio_sem);
+	
+	return retval;
+}
+
 static int __init serio_init(void)
 {
 	int pid;
diff -ru linux-2.6.0-test9.orig/include/linux/serio.h linux-2.6.0-test9/include/linux/serio.h
--- linux-2.6.0-test9.orig/include/linux/serio.h	2003-10-25 13:43:52.000000000 -0500
+++ linux-2.6.0-test9/include/linux/serio.h	2003-11-18 12:15:04.000000000 -0600
@@ -67,6 +67,8 @@
 void serio_register_device(struct serio_dev *dev);
 void serio_unregister_device(struct serio_dev *dev);
 
+int serio_for_each_port(int (*func)(struct serio *));
+
 static __inline__ int serio_write(struct serio *serio, unsigned char data)
 {
 	if (serio->write)