LXR linux/arch/x86/video/fbdev.c

   1/*
   2 * Copyright (C) 2007 Antonino Daplas <adaplas@gmail.com>
   3 *
   4 * This file is subject to the terms and conditions of the GNU General Public
   5 * License.  See the file COPYING in the main directory of this archive
   6 * for more details.
   7 *
   8 */
   9#include <linux/fb.h>
  10#include <linux/pci.h>
  11#include <linux/module.h>
  12#include <linux/vgaarb.h>
  13
  14int fb_is_primary_device(struct fb_info *info)
  15{
  16        struct device *device = info->device;
  17        struct pci_dev *pci_dev = NULL;
  18        struct pci_dev *default_device = vga_default_device();
  19        struct resource *res = NULL;
  20
  21        if (device)
  22                pci_dev = to_pci_dev(device);
  23
  24        if (!pci_dev)
  25                return 0;
  26
  27        if (default_device) {
  28                if (pci_dev == default_device)
  29                        return 1;
  30                else
  31                        return 0;
  32        }
  33
  34        res = &pci_dev->resource[PCI_ROM_RESOURCE];
  35
  36        if (res && res->flags & IORESOURCE_ROM_SHADOW)
  37                return 1;
  38
  39        return 0;
  40}
  41EXPORT_SYMBOL(fb_is_primary_device);
  42MODULE_LICENSE("GPL");
  43