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auxdisplay/cfag12864bfb: Initialize fb_ops with fbdev macros

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Initialize the instance of struct fb_ops with fbdev initializer
macros for framebuffers in virtual address space. Set the read/write,
draw and mmap callbacks to the correct implementation and avoid
implicit defaults. Also select the necessary helpers in Kconfig.

Fbdev drivers sometimes rely on the callbacks being NULL for a
default I/O-memory-based implementation to be invoked; hence
requiring the I/O helpers to be built in any case. Setting all
callbacks in all drivers explicitly will allow to make the I/O
helpers optional. This benefits systems that do not use these
functions.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Miguel Ojeda <ojeda@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231127131655.4020-9-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2023-11-27 14:15:37 +01:00
parent eba1418968
commit 36e6cacdb0
2 changed files with 3 additions and 9 deletions
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5
drivers/auxdisplay/Kconfig
View File

@ -112,10 +112,7 @@ config CFAG12864B
depends on X86
depends on FB
depends on KS0108
select FB_SYS_FILLRECT
select FB_SYS_COPYAREA
select FB_SYS_IMAGEBLIT
select FB_SYS_FOPS
select FB_SYSMEM_HELPERS
default n
help
If you have a Crystalfontz 128x64 2-color LCD, cfag12864b Series,

7
drivers/auxdisplay/cfag12864bfb.c
View File

@ -56,11 +56,8 @@ static int cfag12864bfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
static const struct fb_ops cfag12864bfb_ops = {
.owner = THIS_MODULE,
.fb_read = fb_sys_read,
.fb_write = fb_sys_write,
.fb_fillrect = sys_fillrect,
.fb_copyarea = sys_copyarea,
.fb_imageblit = sys_imageblit,
__FB_DEFAULT_SYSMEM_OPS_RDWR,
__FB_DEFAULT_SYSMEM_OPS_DRAW,
.fb_mmap = cfag12864bfb_mmap,
};