patch-2.4.8 linux/drivers/char/drm/drm_stub.h

• Lines: 158
• Date: Fri Aug 10 18:14:41 2001
• Orig file: v2.4.7/linux/drivers/char/drm/drm_stub.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.7/linux/drivers/char/drm/drm_stub.h linux/drivers/char/drm/drm_stub.h
@@ -0,0 +1,157 @@
+/* drm_stub.h -- -*- linux-c -*-
+ * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
+ *
+ * Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Rickard E. (Rik) Faith <faith@valinux.com>
+ *
+ */
+
+#define __NO_VERSION__
+#include "drmP.h"
+
+#if LINUX_VERSION_CODE < 0x020400
+#include "stubsupport-pre24.h"
+#endif
+
+#define DRM_STUB_MAXCARDS 16	/* Enough for one machine */
+
+static struct drm_stub_list {
+	const char             *name;
+	struct file_operations *fops;
+	struct proc_dir_entry  *dev_root;
+} *DRM(stub_list);
+
+static struct proc_dir_entry *DRM(stub_root);
+
+static struct drm_stub_info {
+	int (*info_register)(const char *name, struct file_operations *fops,
+			     drm_device_t *dev);
+	int (*info_unregister)(int minor);
+} DRM(stub_info);
+
+static int DRM(stub_open)(struct inode *inode, struct file *filp)
+{
+	int                    minor = MINOR(inode->i_rdev);
+	int                    err   = -ENODEV;
+	struct file_operations *old_fops;
+
+	if (!DRM(stub_list) || !DRM(stub_list)[minor].fops) return -ENODEV;
+	old_fops   = filp->f_op;
+	filp->f_op = fops_get(DRM(stub_list)[minor].fops);
+	if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
+		fops_put(filp->f_op);
+		filp->f_op = fops_get(old_fops);
+	}
+	fops_put(old_fops);
+
+	return err;
+}
+
+static struct file_operations DRM(stub_fops) = {
+#if LINUX_VERSION_CODE >= 0x020400
+	owner:   THIS_MODULE,
+#endif
+	open:	 DRM(stub_open)
+};
+
+static int DRM(stub_getminor)(const char *name, struct file_operations *fops,
+			      drm_device_t *dev)
+{
+	int i;
+
+	if (!DRM(stub_list)) {
+		DRM(stub_list) = DRM(alloc)(sizeof(*DRM(stub_list))
+					    * DRM_STUB_MAXCARDS, DRM_MEM_STUB);
+		if(!DRM(stub_list)) return -1;
+		for (i = 0; i < DRM_STUB_MAXCARDS; i++) {
+			DRM(stub_list)[i].name = NULL;
+			DRM(stub_list)[i].fops = NULL;
+		}
+	}
+	for (i = 0; i < DRM_STUB_MAXCARDS; i++) {
+		if (!DRM(stub_list)[i].fops) {
+			DRM(stub_list)[i].name = name;
+			DRM(stub_list)[i].fops = fops;
+			DRM(stub_root) = DRM(proc_init)(dev, i, DRM(stub_root),
+							&DRM(stub_list)[i]
+							.dev_root);
+			return i;
+		}
+	}
+	return -1;
+}
+
+static int DRM(stub_putminor)(int minor)
+{
+	if (minor < 0 || minor >= DRM_STUB_MAXCARDS) return -1;
+	DRM(stub_list)[minor].name = NULL;
+	DRM(stub_list)[minor].fops = NULL;
+	DRM(proc_cleanup)(minor, DRM(stub_root),
+			  DRM(stub_list)[minor].dev_root);
+	if (minor) {
+		inter_module_put("drm");
+	} else {
+		inter_module_unregister("drm");
+		DRM(free)(DRM(stub_list),
+			  sizeof(*DRM(stub_list)) * DRM_STUB_MAXCARDS,
+			  DRM_MEM_STUB);
+		unregister_chrdev(DRM_MAJOR, "drm");
+	}
+	return 0;
+}
+
+
+int DRM(stub_register)(const char *name, struct file_operations *fops,
+		       drm_device_t *dev)
+{
+	struct drm_stub_info *i = NULL;
+
+	DRM_DEBUG("\n");
+	if (register_chrdev(DRM_MAJOR, "drm", &DRM(stub_fops)))
+		i = (struct drm_stub_info *)inter_module_get("drm");
+
+	if (i) {
+				/* Already registered */
+		DRM(stub_info).info_register   = i->info_register;
+		DRM(stub_info).info_unregister = i->info_unregister;
+		DRM_DEBUG("already registered\n");
+	} else if (DRM(stub_info).info_register != DRM(stub_getminor)) {
+		DRM(stub_info).info_register   = DRM(stub_getminor);
+		DRM(stub_info).info_unregister = DRM(stub_putminor);
+		DRM_DEBUG("calling inter_module_register\n");
+		inter_module_register("drm", THIS_MODULE, &DRM(stub_info));
+	}
+	if (DRM(stub_info).info_register)
+		return DRM(stub_info).info_register(name, fops, dev);
+	return -1;
+}
+
+int DRM(stub_unregister)(int minor)
+{
+	DRM_DEBUG("%d\n", minor);
+	if (DRM(stub_info).info_unregister)
+		return DRM(stub_info).info_unregister(minor);
+	return -1;
+}