Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 | /* 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"
#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) = {
.owner = THIS_MODULE,
.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;
}
|