diff options
Diffstat (limited to 'linux/drm_stub.h')
| -rw-r--r-- | linux/drm_stub.h | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/linux/drm_stub.h b/linux/drm_stub.h new file mode 100644 index 00000000..ed37af4d --- /dev/null +++ b/linux/drm_stub.h @@ -0,0 +1,142 @@ +/* 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; +} |