Update code to use misc_register()/misc_deregister()

When the SPL was originally written it was designed to use the
device_create() and device_destroy() functions.  Unfortunately,
these functions changed considerably over the years making them
difficult to rely on.

As it turns out a better choice would have been to use the
misc_register()/misc_deregister() functions.  This interface
for registering character devices has remained stable, is simple,
and provides everything we need.

Therefore the code has been reworked to use this interface.  The
higher level ZFS code has always depended on these same interfaces
so this is also as a step towards minimizing our kernel dependencies.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>

include/Makefile.am

@@ -6,7 +6,6 @@ KERNEL_H = \
 	$(top_srcdir)/include/splat-ctl.h \
 	$(top_srcdir)/include/spl-ctl.h \
 	$(top_srcdir)/include/spl-debug.h \
-	$(top_srcdir)/include/spl-device.h \
 	$(top_srcdir)/include/spl-trace.h \
 	$(top_srcdir)/include/strings.h \
 	$(top_srcdir)/include/unistd.h

include/spl-device.h

@@ -1,90 +0,0 @@
-/*****************************************************************************\
- *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
- *  Copyright (C) 2007 The Regents of the University of California.
- *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
- *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
- *  UCRL-CODE-235197
- *
- *  This file is part of the SPL, Solaris Porting Layer.
- *  For details, see <http://zfsonlinux.org/>.
- *
- *  The SPL is free software; you can redistribute it and/or modify it
- *  under the terms of the GNU General Public License as published by the
- *  Free Software Foundation; either version 2 of the License, or (at your
- *  option) any later version.
- *
- *  The SPL is distributed in the hope that it will be useful, but WITHOUT
- *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- *  for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
-\*****************************************************************************/
-
-#ifndef _SPL_DEVICE_H
-#define _SPL_DEVICE_H
-
-#include <linux/device.h>
-
-/*
- * Preferred API from 2.6.18 to 2.6.26+
- */
-#ifdef HAVE_DEVICE_CREATE
-
-typedef struct class			spl_class;
-typedef struct device			spl_device;
-
-#define spl_class_create(mod, name)	class_create(mod, name)
-#define spl_class_destroy(cls)		class_destroy(cls)
-
-# ifdef HAVE_5ARGS_DEVICE_CREATE
-# define spl_device_create(cls, parent, devt, drvdata, fmt, args...)          \
-	device_create(cls, parent, devt, drvdata, fmt, ## args)
-# else
-# define spl_device_create(cls, parent, devt, drvdata, fmt, args...)          \
-	device_create(cls, parent, devt, fmt, ## args)
-# endif
-
-#define spl_device_destroy(cls, cls_dev, devt)                                \
-	device_destroy(cls, devt)
-
-/*
- * Preferred API from 2.6.13 to 2.6.17
- * Depricated in 2.6.18
- * Removed in 2.6.26
- */
-#else
-#ifdef HAVE_CLASS_DEVICE_CREATE
-
-typedef struct class			spl_class;
-typedef struct class_device		spl_device;
-
-#define spl_class_create(mod, name)	class_create(mod, name)
-#define spl_class_destroy(cls)		class_destroy(cls)
-#define spl_device_create(cls, parent, devt, device, fmt, args...)            \
-	class_device_create(cls, parent, devt, device, fmt, ## args)
-#define spl_device_destroy(cls, cls_dev, devt)                                \
-	class_device_unregister(cls_dev)
-
-/*
- * Prefered API from 2.6.0 to 2.6.12
- * Depricated in 2.6.13
- * Removed in 2.6.13
- */
-#else /* Legacy API */
-
-typedef struct class_simple		spl_class;
-typedef struct class_device		spl_class_device;
-
-#define spl_class_create(mod, name)	class_simple_create(mod, name)
-#define spl_class_destroy(cls)		class_simple_destroy(cls)
-#define spl_device_create(cls, parent, devt, device, fmt, args...)            \
-	class_simple_device_add(cls, devt, device, fmt, ## args)
-#define spl_device_destroy(cls, cls_dev, devt)                                \
-	class_simple_device_remove(devt)
-
-#endif /* HAVE_CLASS_DEVICE_CREATE */
-#endif /* HAVE_DEVICE_CREATE */
-
-#endif /* _SPL_DEVICE_H */

include/splat-ctl.h

@@ -32,8 +32,6 @@
  * ensure 32-bit/64-bit interoperability over ioctl()'s only types with
  * fixed sizes can be used.
  */
-#define SPLAT_MAJOR			225 /* XXX - Arbitrary */
-#define SPLAT_MINORS                    1
 #define SPLAT_NAME			"splatctl"
 #define SPLAT_DEV			"/dev/splatctl"
 

include/sys/sunddi.h

@@ -31,7 +31,6 @@
 #include <sys/mutex.h>
 #include <sys/u8_textprep.h>
 #include <sys/vnode.h>
-#include <spl-device.h>
 
 typedef int ddi_devid_t;