diff options
| author | Benjamin Gaignard <benjamin.gaignard@linaro.org> | 2017-01-04 12:12:55 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2017-01-06 13:00:09 +0300 |
| commit | 82f42e4cc164ed486c9e2b1b74e65b176830d947 (patch) | |
| tree | 9f1c537b1eb4e8288704c31e90d2f121e267abe8 /drivers/video/fbdev/core | |
| parent | e8fa5671183c80342d520ad81d14fa79a9d4a680 (diff) | |
| download | linux-82f42e4cc164ed486c9e2b1b74e65b176830d947.tar.xz | |
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: 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
Diffstat (limited to 'drivers/video/fbdev/core')
| -rw-r--r-- | drivers/video/fbdev/core/fbmem.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c index 76c1ad96fb37..069fe7960df1 100644 --- a/drivers/video/fbdev/core/fbmem.c +++ b/drivers/video/fbdev/core/fbmem.c @@ -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 |