148 lines
4.0 KiB
C
148 lines
4.0 KiB
C
/**
|
|
* \file drm_fops.h
|
|
* File operations for DRM
|
|
*
|
|
* \author Rickard E. (Rik) Faith <faith@valinux.com>
|
|
* \author Daryll Strauss <daryll@valinux.com>
|
|
* \author Gareth Hughes <gareth@valinux.com>
|
|
*/
|
|
|
|
/*
|
|
* Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
|
|
*
|
|
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
|
|
* Copyright 2000 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
|
|
* VA LINUX SYSTEMS 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"
|
|
#include <linux/poll.h>
|
|
|
|
|
|
/**
|
|
* Called whenever a process opens /dev/drm.
|
|
*
|
|
* \param inode device inode.
|
|
* \param filp file pointer.
|
|
* \param dev device.
|
|
* \return zero on success or a negative number on failure.
|
|
*
|
|
* Creates and initializes a drm_file structure for the file private data in \p
|
|
* filp and add it into the double linked list in \p dev.
|
|
*/
|
|
int DRM(open_helper)(struct inode *inode, struct file *filp, drm_device_t *dev)
|
|
{
|
|
int minor = minor(inode->i_rdev);
|
|
drm_file_t *priv;
|
|
|
|
if (filp->f_flags & O_EXCL) return -EBUSY; /* No exclusive opens */
|
|
if (!DRM(cpu_valid)()) return -EINVAL;
|
|
|
|
DRM_DEBUG("pid = %d, minor = %d\n", current->pid, minor);
|
|
|
|
priv = DRM(alloc)(sizeof(*priv), DRM_MEM_FILES);
|
|
if(!priv) return -ENOMEM;
|
|
|
|
memset(priv, 0, sizeof(*priv));
|
|
filp->private_data = priv;
|
|
priv->uid = current->euid;
|
|
priv->pid = current->pid;
|
|
priv->minor = minor;
|
|
priv->dev = dev;
|
|
priv->ioctl_count = 0;
|
|
priv->authenticated = capable(CAP_SYS_ADMIN);
|
|
priv->lock_count = 0;
|
|
|
|
down(&dev->struct_sem);
|
|
if (!dev->file_last) {
|
|
priv->next = NULL;
|
|
priv->prev = NULL;
|
|
dev->file_first = priv;
|
|
dev->file_last = priv;
|
|
} else {
|
|
priv->next = NULL;
|
|
priv->prev = dev->file_last;
|
|
dev->file_last->next = priv;
|
|
dev->file_last = priv;
|
|
}
|
|
up(&dev->struct_sem);
|
|
|
|
#ifdef __alpha__
|
|
/*
|
|
* Default the hose
|
|
*/
|
|
if (!dev->hose) {
|
|
struct pci_dev *pci_dev;
|
|
pci_dev = pci_find_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
|
|
if (pci_dev) dev->hose = pci_dev->sysdata;
|
|
if (!dev->hose) {
|
|
struct pci_bus *b = pci_bus_b(pci_root_buses.next);
|
|
if (b) dev->hose = b->sysdata;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** No-op. */
|
|
int DRM(flush)(struct file *filp)
|
|
{
|
|
drm_file_t *priv = filp->private_data;
|
|
drm_device_t *dev = priv->dev;
|
|
|
|
DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
|
|
current->pid, (long)dev->device, dev->open_count);
|
|
return 0;
|
|
}
|
|
|
|
/** No-op. */
|
|
int DRM(fasync)(int fd, struct file *filp, int on)
|
|
{
|
|
drm_file_t *priv = filp->private_data;
|
|
drm_device_t *dev = priv->dev;
|
|
int retcode;
|
|
|
|
DRM_DEBUG("fd = %d, device = 0x%lx\n", fd, (long)dev->device);
|
|
retcode = fasync_helper(fd, filp, on, &dev->buf_async);
|
|
if (retcode < 0) return retcode;
|
|
return 0;
|
|
}
|
|
|
|
#if !__HAVE_DRIVER_FOPS_POLL
|
|
/** No-op. */
|
|
unsigned int DRM(poll)(struct file *filp, struct poll_table_struct *wait)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
|
|
#if !__HAVE_DRIVER_FOPS_READ
|
|
/** No-op. */
|
|
ssize_t DRM(read)(struct file *filp, char *buf, size_t count, loff_t *off)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|