Read and write operations on the fbdev framebuffer can now be called by
in-kernel users. This is required by DRM's fbdev helpers.
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
drivers/video/fbdev/core/fbmem.c | 53 ++++++++++++++++++++++++--------
include/linux/fb.h | 5 +++
2 files changed, 46 insertions(+), 12 deletions(-)
diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 95c32952fa8a..e49cf2988001 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -754,11 +754,10 @@ static struct fb_info *file_fb_info(struct file *file)
return info;
}
-static ssize_t
-fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
+ssize_t
+fb_cfb_read(struct fb_info *info, char __user *buf, size_t count, loff_t *ppos)
{
unsigned long p = *ppos;
- struct fb_info *info = file_fb_info(file);
u8 *buffer, *dst;
u8 __iomem *src;
int c, cnt = 0, err = 0;
@@ -770,9 +769,6 @@ fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
if (info->state != FBINFO_STATE_RUNNING)
return -EPERM;
- if (info->fbops->fb_read)
- return info->fbops->fb_read(info, buf, count, ppos);
-
total_size = info->screen_size;
if (total_size == 0)
@@ -818,12 +814,13 @@ fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
return (err) ? err : cnt;
}
+EXPORT_SYMBOL(fb_cfb_read);
-static ssize_t
-fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+ssize_t
+fb_cfb_write(struct fb_info *info, const char __user *buf, size_t count,
+ loff_t *ppos)
{
unsigned long p = *ppos;
- struct fb_info *info = file_fb_info(file);
u8 *buffer, *src;
u8 __iomem *dst;
int c, cnt = 0, err = 0;
@@ -835,9 +832,6 @@ fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
if (info->state != FBINFO_STATE_RUNNING)
return -EPERM;
- if (info->fbops->fb_write)
- return info->fbops->fb_write(info, buf, count, ppos);
-
total_size = info->screen_size;
if (total_size == 0)
@@ -890,6 +884,41 @@ fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
return (cnt) ? cnt : err;
}
+EXPORT_SYMBOL(fb_cfb_write);
+
+static ssize_t
+fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
+{
+ struct fb_info *info = file_fb_info(file);
+
+ if (!info || !info->screen_base)
+ return -ENODEV;
+
+ if (info->state != FBINFO_STATE_RUNNING)
+ return -EPERM;
+
+ if (info->fbops->fb_read)
+ return info->fbops->fb_read(info, buf, count, ppos);
+
+ return fb_cfb_read(info, buf, count, ppos);
+}
+
+static ssize_t
+fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+{
+ struct fb_info *info = file_fb_info(file);
+
+ if (!info || !info->screen_base)
+ return -ENODEV;
+
+ if (info->state != FBINFO_STATE_RUNNING)
+ return -EPERM;
+
+ if (info->fbops->fb_write)
+ return info->fbops->fb_write(info, buf, count, ppos);
+
+ return fb_cfb_write(info, buf, count, ppos);
+}
int
fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var)
diff --git a/include/linux/fb.h b/include/linux/fb.h
index 41e0069eca0a..c69e098e6dc5 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -592,6 +592,11 @@ extern int fb_blank(struct fb_info *info, int blank);
extern void cfb_fillrect(struct fb_info *info, const struct fb_fillrect *rect);
extern void cfb_copyarea(struct fb_info *info, const struct fb_copyarea *area);
extern void cfb_imageblit(struct fb_info *info, const struct fb_image *image);
+extern ssize_t fb_cfb_read(struct fb_info *info, char __user *buf,
+ size_t count, loff_t *ppos);
+extern ssize_t fb_cfb_write(struct fb_info *info, const char __user *buf,
+ size_t count, loff_t *ppos);
+
/*
* Drawing operations where framebuffer is in system RAM
*/
--
2.23.0
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