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
  14 int fb_is_primary_device(struct fb_info *info)
  15 {
  16         struct device *device = info->device;
  17         struct pci_dev *default_device = vga_default_device();
  18         struct pci_dev *pci_dev;
  19         struct resource *res;
  20
  21         if (!device || !dev_is_pci(device))
  22                 return 0;
  23
  24         pci_dev = to_pci_dev(device);
  25
  26         if (default_device) {
  27                 if (pci_dev == default_device)
  28                         return 1;
  29                 return 0;
  30         }
  31
  32         res = pci_dev->resource + PCI_ROM_RESOURCE;
  33
  34         if (res->flags & IORESOURCE_ROM_SHADOW)
  35                 return 1;
  36
  37         return 0;
  38 }
  39 EXPORT_SYMBOL(fb_is_primary_device);
  40 MODULE_LICENSE("GPL");