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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;
}
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