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fbmem: add a default get_fb_unmapped_area function

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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: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1483521177-21794-2-git-send-email-benjamin.gaignard@linaro.org
This commit is contained in:
Benjamin Gaignard 2017-01-04 10:12:55 +01:00 committed by Daniel Vetter
parent e8fa567118
commit 82f42e4cc1
2 changed files with 25 additions and 1 deletions
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8
drivers/video/fbdev/Kconfig
View file

@ -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

18
drivers/video/fbdev/core/fbmem.c
View file

@ -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