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Subject[RFC PATCH] video: Use fb_sys_write rather than open-coding in drivers
Several video drivers open code the fb_write write function with code
which is very similar to fb_sys_write. Replace the open code versions
with calls to fb_sys_write. An fb_sync callback is added to each of
the drivers.

Signed-off-by: Ryan Mallon <rmallon@gmail.com>
---

diff --git a/drivers/video/auo_k190x.c b/drivers/video/auo_k190x.c
index 8d2499d..0eeeb26 100644
--- a/drivers/video/auo_k190x.c
+++ b/drivers/video/auo_k190x.c
@@ -362,50 +362,12 @@ out:
* framebuffer operations
*/

-/*
- * this is the slow path from userspace. they can seek and write to
- * the fb. it's inefficient to do anything less than a full screen draw
- */
-static ssize_t auok190xfb_write(struct fb_info *info, const char __user *buf,
- size_t count, loff_t *ppos)
+static int auok190xfb_sync(struct fb_info *info)
{
struct auok190xfb_par *par = info->par;
- unsigned long p = *ppos;
- void *dst;
- int err = 0;
- unsigned long total_size;
-
- if (info->state != FBINFO_STATE_RUNNING)
- return -EPERM;
-
- total_size = info->fix.smem_len;
-
- if (p > total_size)
- return -EFBIG;
-
- if (count > total_size) {
- err = -EFBIG;
- count = total_size;
- }
-
- if (count + p > total_size) {
- if (!err)
- err = -ENOSPC;
-
- count = total_size - p;
- }
-
- dst = (void *)(info->screen_base + p);
-
- if (copy_from_user(dst, buf, count))
- err = -EFAULT;
-
- if (!err)
- *ppos += count;

par->update_all(par);
-
- return (err) ? err : count;
+ return 0;
}

static void auok190xfb_fillrect(struct fb_info *info,
@@ -565,7 +527,8 @@ static int auok190xfb_set_par(struct fb_info *info)
static struct fb_ops auok190xfb_ops = {
.owner = THIS_MODULE,
.fb_read = fb_sys_read,
- .fb_write = auok190xfb_write,
+ .fb_write = fb_sys_write,
+ .fb_sync = auok190xfb_sync,
.fb_fillrect = auok190xfb_fillrect,
.fb_copyarea = auok190xfb_copyarea,
.fb_imageblit = auok190xfb_imageblit,
@@ -1066,6 +1029,7 @@ int auok190x_common_probe(struct platform_device *pdev,

memset(videomemory, 0, videomemorysize);
info->screen_base = (char *)videomemory;
+ info->screen_size = videomemorysize;
info->fix.smem_len = videomemorysize;

info->flags = FBINFO_FLAG_DEFAULT | FBINFO_VIRTFB;
diff --git a/drivers/video/broadsheetfb.c b/drivers/video/broadsheetfb.c
index b09701c..4d6231a 100644
--- a/drivers/video/broadsheetfb.c
+++ b/drivers/video/broadsheetfb.c
@@ -924,6 +924,14 @@ static void broadsheetfb_dpy_update(struct broadsheetfb_par *par)
mutex_unlock(&(par->io_lock));
}

+static int broadsheetfb_sync(struct fb_info *info)
+{
+ struct broadsheetfb_par *par = info->par;
+
+ broadsheetfb_dpy_update(par);
+ return 0;
+}
+
/* this is called back from the deferred io workqueue */
static void broadsheetfb_dpy_deferred_io(struct fb_info *info,
struct list_head *pagelist)
@@ -998,56 +1006,11 @@ static void broadsheetfb_imageblit(struct fb_info *info,
broadsheetfb_dpy_update(par);
}

-/*
- * this is the slow path from userspace. they can seek and write to
- * the fb. it's inefficient to do anything less than a full screen draw
- */
-static ssize_t broadsheetfb_write(struct fb_info *info, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct broadsheetfb_par *par = info->par;
- unsigned long p = *ppos;
- void *dst;
- int err = 0;
- unsigned long total_size;
-
- if (info->state != FBINFO_STATE_RUNNING)
- return -EPERM;
-
- total_size = info->fix.smem_len;
-
- if (p > total_size)
- return -EFBIG;
-
- if (count > total_size) {
- err = -EFBIG;
- count = total_size;
- }
-
- if (count + p > total_size) {
- if (!err)
- err = -ENOSPC;
-
- count = total_size - p;
- }
-
- dst = (void *)(info->screen_base + p);
-
- if (copy_from_user(dst, buf, count))
- err = -EFAULT;
-
- if (!err)
- *ppos += count;
-
- broadsheetfb_dpy_update(par);
-
- return (err) ? err : count;
-}
-
static struct fb_ops broadsheetfb_ops = {
.owner = THIS_MODULE,
.fb_read = fb_sys_read,
- .fb_write = broadsheetfb_write,
+ .fb_write = fb_sys_write,
+ .fb_sync = broadsheetfb_sync,
.fb_fillrect = broadsheetfb_fillrect,
.fb_copyarea = broadsheetfb_copyarea,
.fb_imageblit = broadsheetfb_imageblit,
@@ -1106,6 +1069,7 @@ static int broadsheetfb_probe(struct platform_device *dev)
goto err_fb_rel;

info->screen_base = (char *)videomemory;
+ info->screen_size = videomemorysize;
info->fbops = &broadsheetfb_ops;

broadsheetfb_var.xres = dpyw;
diff --git a/drivers/video/hecubafb.c b/drivers/video/hecubafb.c
index 59d2318..e8361e1 100644
--- a/drivers/video/hecubafb.c
+++ b/drivers/video/hecubafb.c
@@ -114,6 +114,14 @@ static void hecubafb_dpy_update(struct hecubafb_par *par)
apollo_send_command(par, APOLLO_DISPLAY_IMG);
}

+static int hecubafb_sync(struct fb_info *info)
+{
+ struct hecubafb_par *par = info->par;
+
+ hecubafb_dpy_update(par);
+ return 0;
+}
+
/* this is called back from the deferred io workqueue */
static void hecubafb_dpy_deferred_io(struct fb_info *info,
struct list_head *pagelist)
@@ -151,56 +159,11 @@ static void hecubafb_imageblit(struct fb_info *info,
hecubafb_dpy_update(par);
}

-/*
- * this is the slow path from userspace. they can seek and write to
- * the fb. it's inefficient to do anything less than a full screen draw
- */
-static ssize_t hecubafb_write(struct fb_info *info, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct hecubafb_par *par = info->par;
- unsigned long p = *ppos;
- void *dst;
- int err = 0;
- unsigned long total_size;
-
- if (info->state != FBINFO_STATE_RUNNING)
- return -EPERM;
-
- total_size = info->fix.smem_len;
-
- if (p > total_size)
- return -EFBIG;
-
- if (count > total_size) {
- err = -EFBIG;
- count = total_size;
- }
-
- if (count + p > total_size) {
- if (!err)
- err = -ENOSPC;
-
- count = total_size - p;
- }
-
- dst = (void __force *) (info->screen_base + p);
-
- if (copy_from_user(dst, buf, count))
- err = -EFAULT;
-
- if (!err)
- *ppos += count;
-
- hecubafb_dpy_update(par);
-
- return (err) ? err : count;
-}
-
static struct fb_ops hecubafb_ops = {
.owner = THIS_MODULE,
.fb_read = fb_sys_read,
- .fb_write = hecubafb_write,
+ .fb_write = fb_sys_write,
+ .fb_sync = hecubafb_sync,
.fb_fillrect = hecubafb_fillrect,
.fb_copyarea = hecubafb_copyarea,
.fb_imageblit = hecubafb_imageblit,
@@ -240,6 +203,7 @@ static int hecubafb_probe(struct platform_device *dev)
goto err_fballoc;

info->screen_base = (char __force __iomem *)videomemory;
+ info->screen_size = videomemorysize;
info->fbops = &hecubafb_ops;

info->var = hecubafb_var;
diff --git a/drivers/video/metronomefb.c b/drivers/video/metronomefb.c
index f30150d..7f79916 100644
--- a/drivers/video/metronomefb.c
+++ b/drivers/video/metronomefb.c
@@ -447,6 +447,14 @@ static void metronomefb_dpy_update(struct metronomefb_par *par)
metronome_display_cmd(par);
}

+static int metronomefb_sync(struct fb_info *info)
+{
+ struct metronomefb_par *par = info->par;
+
+ metronomefb_dpy_udpate(par);
+ return 0;
+}
+
static u16 metronomefb_dpy_update_page(struct metronomefb_par *par, int index)
{
int i;
@@ -510,55 +518,10 @@ static void metronomefb_imageblit(struct fb_info *info,
metronomefb_dpy_update(par);
}

-/*
- * this is the slow path from userspace. they can seek and write to
- * the fb. it is based on fb_sys_write
- */
-static ssize_t metronomefb_write(struct fb_info *info, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct metronomefb_par *par = info->par;
- unsigned long p = *ppos;
- void *dst;
- int err = 0;
- unsigned long total_size;
-
- if (info->state != FBINFO_STATE_RUNNING)
- return -EPERM;
-
- total_size = info->fix.smem_len;
-
- if (p > total_size)
- return -EFBIG;
-
- if (count > total_size) {
- err = -EFBIG;
- count = total_size;
- }
-
- if (count + p > total_size) {
- if (!err)
- err = -ENOSPC;
-
- count = total_size - p;
- }
-
- dst = (void __force *)(info->screen_base + p);
-
- if (copy_from_user(dst, buf, count))
- err = -EFAULT;
-
- if (!err)
- *ppos += count;
-
- metronomefb_dpy_update(par);
-
- return (err) ? err : count;
-}
-
static struct fb_ops metronomefb_ops = {
.owner = THIS_MODULE,
- .fb_write = metronomefb_write,
+ .fb_write = fb_sys_write,
+ .fb_sync = metronomefb_sync,
.fb_fillrect = metronomefb_fillrect,
.fb_copyarea = metronomefb_copyarea,
.fb_imageblit = metronomefb_imageblit,
@@ -633,6 +596,7 @@ static int metronomefb_probe(struct platform_device *dev)
goto err_fb_rel;

info->screen_base = (char __force __iomem *)videomemory;
+ info->screen_size = videomemorysize;
info->fbops = &metronomefb_ops;

metronomefb_fix.line_length = fw;
diff --git a/drivers/video/ssd1307fb.c b/drivers/video/ssd1307fb.c
index 44967c8..2b46790 100644
--- a/drivers/video/ssd1307fb.c
+++ b/drivers/video/ssd1307fb.c
@@ -198,36 +198,12 @@ static void ssd1307fb_update_display(struct ssd1307fb_par *par)
kfree(array);
}

-
-static ssize_t ssd1307fb_write(struct fb_info *info, const char __user *buf,
- size_t count, loff_t *ppos)
+static int ssd1307fb_sync(struct fb_info *info)
{
struct ssd1307fb_par *par = info->par;
- unsigned long total_size;
- unsigned long p = *ppos;
- u8 __iomem *dst;
-
- total_size = info->fix.smem_len;
-
- if (p > total_size)
- return -EINVAL;
-
- if (count + p > total_size)
- count = total_size - p;
-
- if (!count)
- return -EINVAL;
-
- dst = (void __force *) (info->screen_base + p);
-
- if (copy_from_user(dst, buf, count))
- return -EFAULT;

ssd1307fb_update_display(par);
-
- *ppos += count;
-
- return count;
+ return 0;
}

static void ssd1307fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
@@ -254,7 +230,8 @@ static void ssd1307fb_imageblit(struct fb_info *info, const struct fb_image *ima
static struct fb_ops ssd1307fb_ops = {
.owner = THIS_MODULE,
.fb_read = fb_sys_read,
- .fb_write = ssd1307fb_write,
+ .fb_write = fb_sys_write,
+ .fb_sync = ssd1307fb_sync,
.fb_fillrect = ssd1307fb_fillrect,
.fb_copyarea = ssd1307fb_copyarea,
.fb_imageblit = ssd1307fb_imageblit,
@@ -493,6 +470,7 @@ static int ssd1307fb_probe(struct i2c_client *client,
info->var.blue.offset = 0;

info->screen_base = (u8 __force __iomem *)vmem;
+ info->screen_size = vmem_size;
info->fix.smem_start = (unsigned long)vmem;
info->fix.smem_len = vmem_size;



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