staging/sm750fb: Initialize fb_ops with fbdev macros

Initialize all instances of struct fb_ops with fbdev initializer
macros for framebuffers in I/O 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: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc: Teddy Wang <teddy.wang@siliconmotion.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-staging@lists.linux.dev
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231127131655.4020-27-tzimmermann@suse.de

drivers/staging/sm750fb/sm750.c

@@ -665,31 +665,28 @@ static int sm750fb_set_drv(struct lynxfb_par *par)
 
 static const struct fb_ops lynxfb_ops = {
 	.owner = THIS_MODULE,
+	FB_DEFAULT_IOMEM_OPS,
 	.fb_check_var =  lynxfb_ops_check_var,
 	.fb_set_par = lynxfb_ops_set_par,
 	.fb_setcolreg = lynxfb_ops_setcolreg,
 	.fb_blank = lynxfb_ops_blank,
 	.fb_pan_display = lynxfb_ops_pan_display,
-	.fb_fillrect = cfb_fillrect,
-	.fb_imageblit = cfb_imageblit,
-	.fb_copyarea = cfb_copyarea,
 };
 
 static const struct fb_ops lynxfb_ops_with_cursor = {
 	.owner = THIS_MODULE,
+	FB_DEFAULT_IOMEM_OPS,
 	.fb_check_var =  lynxfb_ops_check_var,
 	.fb_set_par = lynxfb_ops_set_par,
 	.fb_setcolreg = lynxfb_ops_setcolreg,
 	.fb_blank = lynxfb_ops_blank,
 	.fb_pan_display = lynxfb_ops_pan_display,
-	.fb_fillrect = cfb_fillrect,
-	.fb_copyarea = cfb_copyarea,
-	.fb_imageblit = cfb_imageblit,
 	.fb_cursor = lynxfb_ops_cursor,
 };
 
 static const struct fb_ops lynxfb_ops_accel = {
 	.owner = THIS_MODULE,
+	__FB_DEFAULT_IOMEM_OPS_RDWR,
 	.fb_check_var =  lynxfb_ops_check_var,
 	.fb_set_par = lynxfb_ops_set_par,
 	.fb_setcolreg = lynxfb_ops_setcolreg,
@@ -698,10 +695,12 @@ static const struct fb_ops lynxfb_ops_accel = {
 	.fb_fillrect = lynxfb_ops_fillrect,
 	.fb_copyarea = lynxfb_ops_copyarea,
 	.fb_imageblit = lynxfb_ops_imageblit,
+	__FB_DEFAULT_IOMEM_OPS_MMAP,
 };
 
 static const struct fb_ops lynxfb_ops_accel_with_cursor = {
 	.owner = THIS_MODULE,
+	__FB_DEFAULT_IOMEM_OPS_RDWR,
 	.fb_check_var =  lynxfb_ops_check_var,
 	.fb_set_par = lynxfb_ops_set_par,
 	.fb_setcolreg = lynxfb_ops_setcolreg,
@@ -711,6 +710,7 @@ static const struct fb_ops lynxfb_ops_accel_with_cursor = {
 	.fb_copyarea = lynxfb_ops_copyarea,
 	.fb_imageblit = lynxfb_ops_imageblit,
 	.fb_cursor = lynxfb_ops_cursor,
+	__FB_DEFAULT_IOMEM_OPS_MMAP,
 };
 
 static int lynxfb_set_fbinfo(struct fb_info *info, int index)