x86/video/fbdev.c

0001 /*
0002  * Copyright (C) 2007 Antonino Daplas <adaplas@gmail.com>
0003  *
0004  * This file is subject to the terms and conditions of the GNU General Public
0005  * License.  See the file COPYING in the main directory of this archive
0006  * for more details.
0007  *
0008  */
0009 #include <linux/fb.h>
0010 #include <linux/pci.h>
0011 #include <linux/module.h>
0012 #include <linux/vgaarb.h>
0013
0014 int fb_is_primary_device(struct fb_info *info)
0015 {
0016     struct device *device = info->device;
0017     struct pci_dev *default_device = vga_default_device();
0018     struct pci_dev *pci_dev;
0019     struct resource *res;
0020
0021     if (!device || !dev_is_pci(device))
0022         return 0;
0023
0024     pci_dev = to_pci_dev(device);
0025
0026     if (default_device) {
0027         if (pci_dev == default_device)
0028             return 1;
0029         return 0;
0030     }
0031
0032     res = pci_dev->resource + PCI_ROM_RESOURCE;
0033
0034     if (res->flags & IORESOURCE_ROM_SHADOW)
0035         return 1;
0036
0037     return 0;
0038 }
0039 EXPORT_SYMBOL(fb_is_primary_device);
0040 MODULE_LICENSE("GPL");