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Commit 317b3c21 authored by Antonino A. Daplas's avatar Antonino A. Daplas Committed by Linus Torvalds
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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: default avatarAntonino Daplas <adaplas@gmail.com>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 10eb2659

arch/i386/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -108,6 +108,7 @@ drivers-$(CONFIG_PCI) += arch/i386/pci/ 
# must be linked after kernel/

drivers-$(CONFIG_OPROFILE)		+= arch/i386/oprofile/

drivers-$(CONFIG_PM)			+= arch/i386/power/

drivers-$(CONFIG_FB)                    += arch/i386/video/



CFLAGS += $(mflags-y)

AFLAGS += $(mflags-y)

arch/i386/video/Makefile

0 → 100644
+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_FB)               += fbdev.o

arch/i386/video/fbdev.c

0 → 100644
+34 −0
Original line number Diff line number Diff line 
/*

 * 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);

include/asm-alpha/fb.h

+6 −0
Original line number Diff line number Diff line 
#ifndef _ASM_FB_H_

#define _ASM_FB_H_

#include <linux/device.h>



/* Caching is off in the I/O space quadrant by design.  */

#define fb_pgprotect(...) do {} while (0)



static inline int fb_is_primary_device(struct fb_info *info)

{

	return 0;

}



#endif /* _ASM_FB_H_ */

include/asm-arm/fb.h

+6 −0
Original line number Diff line number Diff line 
#ifndef _ASM_FB_H_

#define _ASM_FB_H_



#include <linux/fb.h>

#include <linux/fs.h>

#include <asm/page.h>
@@ -10,4 +11,9 @@ static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma, 
	vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);

}



static inline int fb_is_primary_device(struct fb_info *info)

{

	return 0;

}



#endif /* _ASM_FB_H_ */