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-rw-r--r--linux/drm_stub.h142
1 files changed, 142 insertions, 0 deletions
diff --git a/linux/drm_stub.h b/linux/drm_stub.h
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+++ b/linux/drm_stub.h
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+/* drm_stub.c -- -*- 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 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);
+ 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)
+{
+ if (register_chrdev(DRM_MAJOR, "drm", &DRM(stub_fops))) {
+ /* Already registered */
+ struct drm_stub_info *i;
+ i = (struct drm_stub_info *)inter_module_get("drm");
+ DRM(stub_info).info_register = i->info_register;
+ DRM(stub_info).info_unregister = i->info_unregister;
+ } else {
+ DRM(stub_info).info_register = DRM(stub_getminor);
+ DRM(stub_info).info_unregister = DRM(stub_putminor);
+ 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;
+}