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fbdev: add fb_read/fb_write functions for framebuffers in system RAM

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The functions fb_read() and fb_write in fbmem.c assume that the framebuffer
is in IO memory.  However, we have 3 drivers (hecubafb, arcfb, and vfb)
where the framebuffer is allocated from system RAM (via vmalloc). Using
__raw_read/__raw_write (fb_readl/fb_writel) for these drivers is
illegal, especially in other platforms.

Create file read and write methods for these types of drivers.  These are
named fb_sys_read() and fb_sys_write().

Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Antonino A. Daplas
2007-05-08 00:39:03 -07:00
committed by Linus Torvalds
parent 3f9b0880e4
commit 09aaf268eb
4 changed files with 114 additions and 0 deletions
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4
include/linux/fb.h
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@@ -903,6 +903,10 @@ extern void cfb_imageblit(struct fb_info *info, const struct fb_image *image);
extern void sys_fillrect(struct fb_info *info, const struct fb_fillrect *rect);
extern void sys_copyarea(struct fb_info *info, const struct fb_copyarea *area);
extern void sys_imageblit(struct fb_info *info, const struct fb_image *image);
extern ssize_t fb_sys_read(struct fb_info *info, char __user *buf,
size_t count, loff_t *ppos);
extern ssize_t fb_sys_write(struct fb_info *info, const char __user *buf,
size_t count, loff_t *ppos);
/* drivers/video/fbmem.c */
extern int register_framebuffer(struct fb_info *fb_info);