media/ivtvfb: Initialize fb_ops to fbdev I/O-memory helpers

Initialize the instance of struct fb_ops with fbdev initializer
macros for framebuffers in I/O address space. This explictily sets
the read/write, draw and mmap callbacks to the correct default
implementation.

Fbdev drivers sometimes rely on the callbacks being NULL for a
default implementation to be invoked; hence requireing 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.

Set the callbacks via macros. No functional changes.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Andy Walls <awalls@md.metrocast.net>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: linux-media@vger.kernel.org
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Link: https://patchwork.freedesktop.org/patch/msgid/20231127131655.4020-21-tzimmermann@suse.de

drivers/media/pci/ivtv/Kconfig

@@ -48,9 +48,7 @@ config VIDEO_IVTV_ALSA
 config VIDEO_FB_IVTV
 	tristate "Conexant cx23415 framebuffer support"
 	depends on VIDEO_IVTV && FB
-	select FB_CFB_FILLRECT
-	select FB_CFB_COPYAREA
-	select FB_CFB_IMAGEBLIT
+	select FB_IOMEM_HELPERS
 	help
 	  This is a framebuffer driver for the Conexant cx23415 MPEG
 	  encoder/decoder.

drivers/media/pci/ivtv/ivtvfb.c

@@ -927,17 +927,17 @@ static int ivtvfb_blank(int blank_mode, struct fb_info *info)
 
 static const struct fb_ops ivtvfb_ops = {
 	.owner = THIS_MODULE,
+	.fb_read        = fb_io_read,
 	.fb_write       = ivtvfb_write,
 	.fb_check_var   = ivtvfb_check_var,
 	.fb_set_par     = ivtvfb_set_par,
 	.fb_setcolreg   = ivtvfb_setcolreg,
-	.fb_fillrect    = cfb_fillrect,
-	.fb_copyarea    = cfb_copyarea,
-	.fb_imageblit   = cfb_imageblit,
+	__FB_DEFAULT_IOMEM_OPS_DRAW,
 	.fb_cursor      = NULL,
 	.fb_ioctl       = ivtvfb_ioctl,
 	.fb_pan_display = ivtvfb_pan_display,
 	.fb_blank       = ivtvfb_blank,
+	__FB_DEFAULT_IOMEM_OPS_MMAP,
 };
 
 /* Restore hardware after firmware restart */