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Commit 82f42e4c authored by Benjamin Gaignard's avatar Benjamin Gaignard Committed by Daniel Vetter
Browse files

fbmem: add a default get_fb_unmapped_area function 



Allow generic frame-buffer to provide a default
get_fb_unmapped_area function if specific devices need it.

Usually this function is defined in architecture directories but
define it here may limit code duplication especially for all ARM
platforms without MMU.

version 5:
- set get_unmapped_area field if FB_PROVIDE_GET_FB_UNMAPPED_AREA is
  defined

version 4:
- introdude a configuration flag to be independent of architecture

Signed-off-by: default avatarBenjamin Gaignard <benjamin.gaignard@linaro.org>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1483521177-21794-2-git-send-email-benjamin.gaignard@linaro.org
parent e8fa5671

drivers/video/fbdev/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -138,6 +138,14 @@ config FB_SYS_IMAGEBLIT 
	  blitting. This is used by drivers that don't provide their own

	  (accelerated) version and the framebuffer is in system RAM.



config FB_PROVIDE_GET_FB_UNMAPPED_AREA

	bool

	depends on FB

	default n

	---help---

	  Allow generic frame-buffer to provide get_fb_unmapped_area

	  function.



menuconfig FB_FOREIGN_ENDIAN

	bool "Framebuffer foreign endianness support"

	depends on FB

drivers/video/fbdev/core/fbmem.c

+17 −1
Original line number Diff line number Diff line
@@ -1492,6 +1492,21 @@ __releases(&info->lock) 
	return 0;

}



#ifdef CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA

unsigned long get_fb_unmapped_area(struct file *filp,

				   unsigned long addr, unsigned long len,

				   unsigned long pgoff, unsigned long flags)

{

	struct fb_info * const info = filp->private_data;

	unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len);



	if (pgoff > fb_size || len > fb_size - pgoff)

		return -EINVAL;



	return (unsigned long)info->screen_base + pgoff;

}

#endif



static const struct file_operations fb_fops = {

	.owner =	THIS_MODULE,

	.read =		fb_read,
@@ -1503,7 +1518,8 @@ static const struct file_operations fb_fops = { 
	.mmap =		fb_mmap,

	.open =		fb_open,

	.release =	fb_release,

#ifdef HAVE_ARCH_FB_UNMAPPED_AREA

#if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \

    defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA)

	.get_unmapped_area = get_fb_unmapped_area,

#endif

#ifdef CONFIG_FB_DEFERRED_IO