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authorAntonino A. Daplas <adaplas@gmail.com>2007-07-17 04:05:28 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-17 10:23:11 -0700
commit317b3c2167f5326a7de30a1abe50c9897da7a0e3 (patch)
treee0a8481121bb54bc2e714ea3b6c89b67a881a278 /arch/i386/video
parent10eb2659cc6059d0c4de2e2c66d1534091519f56 (diff)
fbdev: detect primary display device
Add function helper, fb_is_primary_device(). Given struct fb_info, it will return a nonzero value if the device is the primary display. Currently, only the i386 is supported where the function checks for the IORESOURCE_ROM_SHADOW flag. Signed-off-by: Antonino Daplas <adaplas@gmail.com> Cc: David Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/i386/video')
-rw-r--r--arch/i386/video/Makefile1
-rw-r--r--arch/i386/video/fbdev.c34
2 files changed, 35 insertions, 0 deletions
diff --git a/arch/i386/video/Makefile b/arch/i386/video/Makefile
new file mode 100644
index 00000000000..2c447c94adc
--- /dev/null
+++ b/arch/i386/video/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_FB) += fbdev.o
diff --git a/arch/i386/video/fbdev.c b/arch/i386/video/fbdev.c
new file mode 100644
index 00000000000..7fc712c46a6
--- /dev/null
+++ b/arch/i386/video/fbdev.c
@@ -0,0 +1,34 @@
+/*
+ * arch/i386/video/fbdev.c - i386 Framebuffer
+ *
+ * Copyright (C) 2007 Antonino Daplas <adaplas@gmail.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive
+ * for more details.
+ *
+ */
+#include <linux/fb.h>
+#include <linux/pci.h>
+
+int fb_is_primary_device(struct fb_info *info)
+{
+ struct device *device;
+ struct pci_dev *pci_dev = NULL;
+ struct resource *res = NULL;
+ int retval = 0;
+
+ device = info->device;
+
+ if (device)
+ pci_dev = to_pci_dev(device);
+
+ if (pci_dev)
+ res = &pci_dev->resource[PCI_ROM_RESOURCE];
+
+ if (res && res->flags & IORESOURCE_ROM_SHADOW)
+ retval = 1;
+
+ return retval;
+}
+EXPORT_SYMBOL(fb_is_primary_device);