154 lines
4.2 KiB
C
154 lines
4.2 KiB
C
/**
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* \file drm_fops.h
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* File operations for DRM
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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* \author Daryll Strauss <daryll@valinux.com>
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* \author Gareth Hughes <gareth@valinux.com>
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*/
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/*
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* Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "drmP.h"
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#include <linux/poll.h>
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/**
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* Called whenever a process opens /dev/drm.
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*
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* \param inode device inode.
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* \param filp file pointer.
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* \param dev device.
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* \return zero on success or a negative number on failure.
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*
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* Creates and initializes a drm_file structure for the file private data in \p
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* filp and add it into the double linked list in \p dev.
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*/
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int DRM(open_helper)(struct inode *inode, struct file *filp, drm_device_t *dev)
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{
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int minor = iminor(inode);
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drm_file_t *priv;
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int ret;
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if (filp->f_flags & O_EXCL) return -EBUSY; /* No exclusive opens */
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if (!DRM(cpu_valid)()) return -EINVAL;
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DRM_DEBUG("pid = %d, minor = %d\n", current->pid, minor);
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priv = DRM(alloc)(sizeof(*priv), DRM_MEM_FILES);
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if(!priv) return -ENOMEM;
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memset(priv, 0, sizeof(*priv));
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filp->private_data = priv;
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priv->uid = current->euid;
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priv->pid = current->pid;
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priv->minor = minor;
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priv->dev = dev;
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priv->ioctl_count = 0;
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priv->authenticated = capable(CAP_SYS_ADMIN);
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priv->lock_count = 0;
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if (dev->fn_tbl.open_helper) {
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ret=dev->fn_tbl.open_helper(dev, priv);
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if (ret < 0)
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goto out_free;
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}
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down(&dev->struct_sem);
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if (!dev->file_last) {
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priv->next = NULL;
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priv->prev = NULL;
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dev->file_first = priv;
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dev->file_last = priv;
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} else {
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priv->next = NULL;
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priv->prev = dev->file_last;
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dev->file_last->next = priv;
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dev->file_last = priv;
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}
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up(&dev->struct_sem);
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#ifdef __alpha__
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/*
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* Default the hose
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*/
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if (!dev->hose) {
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struct pci_dev *pci_dev;
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pci_dev = pci_find_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
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if (pci_dev) dev->hose = pci_dev->sysdata;
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if (!dev->hose) {
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struct pci_bus *b = pci_bus_b(pci_root_buses.next);
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if (b) dev->hose = b->sysdata;
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}
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}
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#endif
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return 0;
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out_free:
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DRM(free)(priv, sizeof(*priv), DRM_MEM_FILES);
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filp->private_data=NULL;
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return ret;
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}
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/** No-op. */
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int DRM(flush)(struct file *filp)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->dev;
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DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
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current->pid, (long)old_encode_dev(dev->device), dev->open_count);
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return 0;
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}
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/** No-op. */
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int DRM(fasync)(int fd, struct file *filp, int on)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->dev;
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int retcode;
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DRM_DEBUG("fd = %d, device = 0x%lx\n", fd, (long)old_encode_dev(dev->device));
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retcode = fasync_helper(fd, filp, on, &dev->buf_async);
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if (retcode < 0) return retcode;
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return 0;
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}
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/** No-op. */
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unsigned int DRM(poll)(struct file *filp, struct poll_table_struct *wait)
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{
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return 0;
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}
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/** No-op. */
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ssize_t DRM(read)(struct file *filp, char __user *buf, size_t count, loff_t *off)
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{
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return 0;
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}
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