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To: Greg KH <greg@kroah.com>
CC: Andi Kleen <ak@muc.de>, <linux-kernel@vger.kernel.org>
Subject: [PATCH] Add sysfs support for the i8259 PIC on x86_64
From: ebiederm@xmission.com (Eric W. Biederman)
Date: 20 Aug 2004 02:40:49 -0600
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I got to looking at x86_64 and while it occasionally uses the i8259 legacy
pic it is not put in sysfs.

Here is the appropriate code ported code from i386.

diff -uNr linux-2.6.8.1-i8259-shutdown.i386/arch/x86_64/kernel/i8259.c linux-2.6.8.1-i8259-sysfs.x86_64/arch/x86_64/kernel/i8259.c
--- linux-2.6.8.1-i8259-shutdown.i386/arch/x86_64/kernel/i8259.c	Wed Aug 18 14:54:30 2004
+++ linux-2.6.8.1-i8259-sysfs.x86_64/arch/x86_64/kernel/i8259.c	Wed Aug 18 14:59:00 2004
@@ -342,6 +342,44 @@
 	}
 }
 
+static int i8259A_resume(struct sys_device *dev)
+{
+	init_8259A(0);
+	return 0;
+}
+
+static int i8259A_shutdown(struct sys_device *dev)
+{
+	/* Put the i8259A into a quiescent state that
+	 * the kernel initialization code can get it
+	 * out of.
+	 */
+	outb(0xff, 0x21);	/* mask all of 8259A-1 */
+	outb(0xff, 0xA1);	/* mask all of 8259A-1 */
+	return 0;
+}
+
+static struct sysdev_class i8259_sysdev_class = {
+	set_kset_name("i8259"),
+	.resume = i8259A_resume,
+	.shutdown = i8259A_shutdown,
+};
+
+static struct sys_device device_i8259A = {
+	.id	= 0,
+	.cls	= &i8259_sysdev_class,
+};
+
+static int __init i8259A_init_sysfs(void)
+{
+	int error = sysdev_class_register(&i8259_sysdev_class);
+	if (!error)
+		error = sysdev_register(&device_i8259A);
+	return error;
+}
+
+device_initcall(i8259A_init_sysfs);
+
 void __init init_8259A(int auto_eoi)
 {
 	unsigned long flags;