[PATCH] adb: create class devices for each handler

[Aristeu Sergio Rozanski Filho]

This patch creates a class device for each registered ADB handler
(currently only adbhid) such as /sys/classes/adb/keyboard0/,
/sys/classes/adb/mouse0/. This is needed for the next patch, to create
a sysfs entry to make SYSRQ key configurable on ADB based machines.

Signed-off-by: Aristeu S. Rozanski F. <aris at cathedrallabs.org>
Acked-by: Michael Hanselmann <linux-kernel at hansmi.ch>

Index: ppc-2.6/drivers/macintosh/adb.c
===================================================================
--- ppc-2.6.orig/drivers/macintosh/adb.c	2006-08-03 23:51:35.000000000 -0300
+++ ppc-2.6/drivers/macintosh/adb.c	2006-08-03 23:56:00.000000000 -0300
@@ -102,11 +102,22 @@
 static void adbdev_init(void);
 static int try_handler_change(int, int);
 
+static char *adb_device_id_string[] = {
+	[ADB_DONGLE] = "dongle",
+	[ADB_KEYBOARD] = "keyboard",
+	[ADB_MOUSE] = "mouse",
+	[ADB_TABLET] = "tablet",
+	[ADB_MODEM] = "modem",
+	[ADB_MISC] = "misc",
+};
+
 static struct adb_handler {
 	void (*handler)(unsigned char *, int, struct pt_regs *, int);
 	int original_address;
 	int handler_id;
 	int busy;
+	char name[16];
+	struct class_device *device;
 } adb_handler[16];
 
 /*
@@ -541,6 +552,15 @@
 			write_lock_irq(&adb_handler_lock);
 			adb_handler[i].handler = handler;
 			write_unlock_irq(&adb_handler_lock);
+
+			snprintf(adb_handler[i].name,
+				sizeof(adb_handler[i].name), "%s%i",
+				adb_device_id_string[default_id], ids->nids);
+			adb_handler[i].device = class_device_create(
+							adb_dev_class, NULL,
+							MKDEV(0, 0), NULL,
+							adb_handler[i].name);
+			ids->device[ids->nids] = adb_handler[i].device;
 			ids->id[ids->nids++] = i;
 		}
 	}
@@ -563,6 +583,7 @@
 		}
 		ret = 0;
 		adb_handler[index].handler = NULL;
+		class_device_del(adb_handler[index].device);
 	}
 	write_unlock_irq(&adb_handler_lock);
 	up(&adb_handler_sem);
Index: ppc-2.6/include/linux/adb.h
===================================================================
--- ppc-2.6.orig/include/linux/adb.h	2006-08-03 23:51:35.000000000 -0300
+++ ppc-2.6/include/linux/adb.h	2006-08-03 23:57:56.000000000 -0300
@@ -3,6 +3,7 @@
  */
 #ifndef __ADB_H
 #define __ADB_H
+#include <linux/device.h>
 
 /* ADB commands */
 #define ADB_BUSRESET		0
@@ -58,6 +59,7 @@
 struct adb_ids {
 	int nids;
 	unsigned char id[16];
+	struct class_device *device[16];
 };
 
 /* Structure which encapsulates a low-level ADB driver */