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>

arch/i386/Makefile

@@ -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

@@ -0,0 +1 @@
+obj-$(CONFIG_FB)               += fbdev.o

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);

include/asm-alpha/fb.h

@@ -1,7 +1,13 @@
 #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

@@ -1,6 +1,7 @@
 #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_ */

include/asm-arm26/fb.h

@@ -1,6 +1,12 @@
 #ifndef _ASM_FB_H_
 #define _ASM_FB_H_
+#include <linux/fb.h>
 
 #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-avr32/fb.h

@@ -1,6 +1,7 @@
 #ifndef _ASM_FB_H_
 #define _ASM_FB_H_
 
+#include <linux/fb.h>
 #include <linux/fs.h>
 #include <asm/page.h>
 
@@ -12,4 +13,9 @@ static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
 				     | (_PAGE_BUFFER | _PAGE_DIRTY));
 }
 
+static inline int fb_is_primary_device(struct fb_info *info)
+{
+	return 0;
+}
+
 #endif /* _ASM_FB_H_ */

include/asm-blackfin/fb.h

@@ -1,6 +1,12 @@
 #ifndef _ASM_FB_H_
 #define _ASM_FB_H_
+#include <linux/fb.h>
 
 #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-cris/fb.h

@@ -1,6 +1,12 @@
 #ifndef _ASM_FB_H_
 #define _ASM_FB_H_
+#include <linux/fb.h>
 
 #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-frv/fb.h

@@ -1,6 +1,12 @@
 #ifndef _ASM_FB_H_
 #define _ASM_FB_H_
+#include <linux/fb.h>
 
 #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-h8300/fb.h

@@ -1,6 +1,12 @@
 #ifndef _ASM_FB_H_
 #define _ASM_FB_H_
+#include <linux/fb.h>
 
 #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-i386/fb.h

@@ -1,9 +1,12 @@
 #ifndef _ASM_FB_H_
 #define _ASM_FB_H_
 
+#include <linux/fb.h>
 #include <linux/fs.h>
 #include <asm/page.h>
 
+extern int fb_is_primary_device(struct fb_info *info);
+
 static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
 				unsigned long off)
 {

include/asm-ia64/fb.h

@@ -1,6 +1,7 @@
 #ifndef _ASM_FB_H_
 #define _ASM_FB_H_
 
+#include <linux/fb.h>
 #include <linux/fs.h>
 #include <linux/efi.h>
 #include <asm/page.h>
@@ -14,4 +15,9 @@ static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
 		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 }
 
+static inline int fb_is_primary_device(struct fb_info *info)
+{
+	return 0;
+}
+
 #endif /* _ASM_FB_H_ */

include/asm-m32r/fb.h

@@ -1,6 +1,7 @@
 #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_ */

include/asm-m68k/fb.h

@@ -1,6 +1,7 @@
 #ifndef _ASM_FB_H_
 #define _ASM_FB_H_
 
+#include <linux/fb.h>
 #include <linux/fs.h>
 #include <asm/page.h>
 #include <asm/setup.h>
@@ -25,4 +26,9 @@ static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
 }
 #endif /* CONFIG_SUN3 */
 
+static inline int fb_is_primary_device(struct fb_info *info)
+{
+	return 0;
+}
+
 #endif /* _ASM_FB_H_ */

include/asm-m68knommu/fb.h

@@ -1,6 +1,12 @@
 #ifndef _ASM_FB_H_
 #define _ASM_FB_H_
+#include <linux/fb.h>
 
 #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-mips/fb.h

@@ -1,6 +1,7 @@
 #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_noncached(vma->vm_page_prot);
 }
 
+static inline int fb_is_primary_device(struct fb_info *info)
+{
+	return 0;
+}
+
 #endif /* _ASM_FB_H_ */

include/asm-parisc/fb.h

@@ -1,6 +1,7 @@
 #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,
 	pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
 }
 
+static inline int fb_is_primary_device(struct fb_info *info)
+{
+	return 0;
+}
+
 #endif /* _ASM_FB_H_ */

include/asm-powerpc/fb.h

@@ -1,6 +1,7 @@
 #ifndef _ASM_FB_H_
 #define _ASM_FB_H_
 
+#include <linux/fb.h>
 #include <linux/fs.h>
 #include <asm/page.h>
 
@@ -12,4 +13,9 @@ static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
 						 vma->vm_page_prot);
 }
 
+static inline int fb_is_primary_device(struct fb_info *info)
+{
+	return 0;
+}
+
 #endif /* _ASM_FB_H_ */

include/asm-s390/fb.h

@@ -1,6 +1,12 @@
 #ifndef _ASM_FB_H_
 #define _ASM_FB_H_
+#include <linux/fb.h>
 
 #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-sh/fb.h

@@ -1,6 +1,7 @@
 #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_ */

include/asm-sh64/fb.h

@@ -1,6 +1,7 @@
 #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_ */

include/asm-sparc/fb.h

@@ -1,6 +1,12 @@
 #ifndef _ASM_FB_H_
 #define _ASM_FB_H_
+#include <linux/fb.h>
 
 #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-sparc64/fb.h

@@ -1,5 +1,6 @@
 #ifndef _ASM_FB_H_
 #define _ASM_FB_H_
+#include <linux/fb.h>
 #include <linux/fs.h>
 #include <asm/page.h>
 
@@ -9,4 +10,9 @@ static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
 	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 }
 
+static inline int fb_is_primary_device(struct fb_info *info)
+{
+	return 0;
+}
+
 #endif /* _ASM_FB_H_ */

include/asm-v850/fb.h

@@ -1,6 +1,12 @@
 #ifndef _ASM_FB_H_
 #define _ASM_FB_H_
+#include <linux/fb.h>
 
 #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-x86_64/fb.h

@@ -1,6 +1,6 @@
 #ifndef _ASM_FB_H_
 #define _ASM_FB_H_
-
+#include <linux/fb.h>
 #include <linux/fs.h>
 #include <asm/page.h>
 
@@ -11,4 +11,9 @@ static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma,
 		pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
 }
 
+static inline int fb_is_primary_device(struct fb_info *info)
+{
+	return 0;
+}
+
 #endif /* _ASM_FB_H_ */

include/asm-xtensa/fb.h

@@ -1,6 +1,12 @@
 #ifndef _ASM_FB_H_
 #define _ASM_FB_H_
+#include <linux/fb.h>
 
 #define fb_pgprotect(...) do {} while (0)
 
+static inline int fb_is_primary_device(struct fb_info *info)
+{
+	return 0;
+}
+
 #endif /* _ASM_FB_H_ */