renesas/drm.git - libdrm, cloned from git://anongit.freedesktop.org/mesa/drm

Age	Commit message (Expand)	Author
2006-12-01	Track linux-core symlinks in git.	Michel Dänzer

/** * \file drm_stub.h * Stub support * * \author Rickard E. (Rik) Faith <faith@valinux.com> */ /* * 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. */ #define __NO_VERSION__ #include "drmP.h" #define DRM_STUB_MAXCARDS 16 /* Enough for one machine */ static struct class_simple *drm_class; /** Stub list. One for each minor. */ static struct drm_stub_list { const char *name; struct file_operations *fops; /**< file operations */ struct proc_dir_entry *dev_root; /**< proc directory entry */ } *DRM(stub_list); static struct proc_dir_entry *DRM(stub_root); /** Stub information */ 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); /** * File \c open operation. * * \param inode device inode. * \param filp file pointer. * * Puts the drm_stub_list::fops corresponding to the device minor number into * \p filp, call the \c open method, and restore the file operations. */ static int DRM(stub_open)(struct inode *inode, struct file *filp) { int minor = iminor(inode); 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; } /** File operations structure */ static struct file_operations DRM(stub_fops) = { .owner = THIS_MODULE, .open = DRM(stub_open) }; /** * Get a device minor number. * * \param name driver name. * \param fops file operations. * \param dev DRM device. * \return minor number on success, or a negative number on failure. * * Allocate and initialize ::stub_list if one doesn't exist already. Search an * empty entry and initialize it to the given parameters, and create the proc * init entry via proc_init(). */ 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); class_simple_device_add(drm_class, MKDEV(DRM_MAJOR, i), NULL, name); return i; } } return -1; } /** * Put a device minor number. * * \param minor minor number. * \return always zero. * * Cleans up the proc resources. If a minor is zero then release the foreign * "drm" data, otherwise unregisters the "drm" data, frees the stub list and * unregisters the character device. */ 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) { class_simple_device_remove(MKDEV(DRM_MAJOR, 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"); class_simple_device_remove(MKDEV(DRM_MAJOR, minor)); class_simple_destroy(drm_class); } return 0; } /** * Register. * * \param name driver name. * \param fops file operations * \param dev DRM device. * \return zero on success or a negative number on failure. * * Attempt to register the char device and get the foreign "drm" data. If * successful then another module already registered so gets the stub info, * otherwise use this module stub info and make it available for other modules. * * Finally calls stub_info::info_register. */ int DRM(stub_register)(const char *name, struct file_operations *fops, drm_device_t *dev) { struct drm_stub_info *i = NULL; int ret1; int ret2; DRM_DEBUG("\n"); ret1 = register_chrdev(DRM_MAJOR, "drm", &DRM(stub_fops)); if (!ret1) { drm_class = class_simple_create(THIS_MODULE, "drm"); if (IS_ERR(drm_class)) { printk (KERN_ERR "Error creating drm class.\n"); unregister_chrdev(DRM_MAJOR, "drm"); return PTR_ERR(drm_class); } } else if (ret1 == -EBUSY) i = (struct drm_stub_info *)inter_module_get("drm"); else return -1; 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) { ret2 = DRM(stub_info).info_register(name, fops, dev); if (ret2) { if (!ret1) { unregister_chrdev(DRM_MAJOR, "drm"); class_simple_destroy(drm_class); } if (!i) inter_module_unregister("drm"); } return ret2; } return -1; } /** * Unregister. * * \param minor * * Calls drm_stub_info::unregister. */ 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; }