Implement the driver's fops with the generator macros for deferred
I/O. Only requires per-driver code for the on-scren scanout buffer.
The generated helpers implement reading, writing and drawing on top
of that. Also update the selected Kconfig tokens accordingly.
Actual support for deferred I/O is missing from the driver. So
writing to memory-mapped pages does not automatically update the
scanout buffer.
Signed-off-by: Thomas Zimmermann <tzimmerm...@suse.de>
Cc: Jaya Kumar <jay...@intworks.biz>
---
drivers/video/fbdev/Kconfig | 5 +-
drivers/video/fbdev/arcfb.c | 113 +++++++++---------------------------
2 files changed, 27 insertions(+), 91 deletions(-)
diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
index e897bf3976bc2..e789e5c1973cb 100644
--- a/drivers/video/fbdev/Kconfig
+++ b/drivers/video/fbdev/Kconfig
@@ -272,10 +272,7 @@ config FB_FM2
config FB_ARC
tristate "Arc Monochrome LCD board support"
depends on FB && (X86 || COMPILE_TEST)
- select FB_SYS_FILLRECT
- select FB_SYS_COPYAREA
- select FB_SYS_IMAGEBLIT
- select FB_SYS_FOPS
+ select FB_SYSMEM_HELPERS_DEFERRED
help
This enables support for the Arc Monochrome LCD board. The board
is based on the KS-108 lcd controller and is typically a matrix
diff --git a/drivers/video/fbdev/arcfb.c b/drivers/video/fbdev/arcfb.c
index 7344e825543af..b2408543277ce 100644
--- a/drivers/video/fbdev/arcfb.c
+++ b/drivers/video/fbdev/arcfb.c
@@ -363,39 +363,6 @@ static void arcfb_lcd_update(struct arcfb_par *par,
unsigned int dx,
}
}
-static void arcfb_fillrect(struct fb_info *info,
- const struct fb_fillrect *rect)
-{
- struct arcfb_par *par = info->par;
-
- sys_fillrect(info, rect);
-
- /* update the physical lcd */
- arcfb_lcd_update(par, rect->dx, rect->dy, rect->width, rect->height);
-}
-
-static void arcfb_copyarea(struct fb_info *info,
- const struct fb_copyarea *area)
-{
- struct arcfb_par *par = info->par;
-
- sys_copyarea(info, area);
-
- /* update the physical lcd */
- arcfb_lcd_update(par, area->dx, area->dy, area->width, area->height);
-}
-
-static void arcfb_imageblit(struct fb_info *info, const struct fb_image *image)
-{
- struct arcfb_par *par = info->par;
-
- sys_imageblit(info, image);
-
- /* update the physical lcd */
- arcfb_lcd_update(par, image->dx, image->dy, image->width,
- image->height);
-}
-
static int arcfb_ioctl(struct fb_info *info,
unsigned int cmd, unsigned long arg)
{
@@ -436,76 +403,48 @@ static int arcfb_ioctl(struct fb_info *info,
}
}
-/*
- * this is the access path from userspace. they can seek and write to
- * the fb. it's inefficient for them to do anything less than 64*8
- * writes since we update the lcd in each write() anyway.
- */
-static ssize_t arcfb_write(struct fb_info *info, const char __user *buf,
- size_t count, loff_t *ppos)
+static void arcfb_damage_range(struct fb_info *info, off_t off, size_t len)
{
- /* modded from epson 1355 */
-
- unsigned long p;
- int err;
- unsigned int fbmemlength,x,y,w,h, bitppos, startpos, endpos, bitcount;
- struct arcfb_par *par;
- unsigned int xres;
-
- if (!info->screen_buffer)
- return -ENODEV;
-
- p = *ppos;
- par = info->par;
- xres = info->var.xres;
- fbmemlength = (xres * info->var.yres)/8;
-
- if (p > fbmemlength)
- return -ENOSPC;
-
- err = 0;
- if ((count + p) > fbmemlength) {
- count = fbmemlength - p;
- err = -ENOSPC;
- }
-
- if (count) {
- char *base_addr;
-
- base_addr = info->screen_buffer;
- count -= copy_from_user(base_addr + p, buf, count);
- *ppos += count;
- err = -EFAULT;
- }
-
+ struct arcfb_par *par = info->par;
+ unsigned int xres = info->var.xres;
+ unsigned int bitppos, startpos, endpos, bitcount;
+ unsigned int x, y, width, height;
- bitppos = p*8;
+ bitppos = off * 8;
startpos = floorXres(bitppos, xres);
- endpos = ceilXres((bitppos + (count*8)), xres);
+ endpos = ceilXres((bitppos + (len * 8)), xres);
bitcount = endpos - startpos;
x = startpos % xres;
y = startpos / xres;
- w = xres;
- h = bitcount / xres;
- arcfb_lcd_update(par, x, y, w, h);
+ width = xres;
+ height = bitcount / xres;
+
+ arcfb_lcd_update(par, x, y, width, height);
+}
- if (count)
- return count;
- return err;
+static void arcfb_damage_area(struct fb_info *info, u32 x, u32 y,
+ u32 width, u32 height)
+{
+ struct arcfb_par *par = info->par;
+
+ /* update the physical lcd */
+ arcfb_lcd_update(par, x, y, width, height);
}
+FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(arcfb,
+ arcfb_damage_range,
+ arcfb_damage_area)
+
static const struct fb_ops arcfb_ops = {
.owner = THIS_MODULE,
.fb_open = arcfb_open,
- .fb_read = fb_sys_read,
- .fb_write = arcfb_write,
+ __FB_DEFAULT_DEFERRED_OPS_RDWR(arcfb),
.fb_release = arcfb_release,
.fb_pan_display = arcfb_pan_display,
- .fb_fillrect = arcfb_fillrect,
- .fb_copyarea = arcfb_copyarea,
- .fb_imageblit = arcfb_imageblit,
+ __FB_DEFAULT_DEFERRED_OPS_DRAW(arcfb),
.fb_ioctl = arcfb_ioctl,
+ // .fb_mmap reqires deferred I/O
};
static int arcfb_probe(struct platform_device *dev)
--
2.42.0
