android_kernel_xiaomi_sm8350/drivers/video/fb_sys_fops.c
Krzysztof Helt 84902b7af6 fbdev: change asm/uaccess.h to linux/uaccess.h
This patch replaces <asm/uaccess.h> with <linux/uaccess.h> after the
checkpatch.pl hint.  The include of <asm/uaccess.h> is removed if the driver
does not use it.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
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>
2007-10-16 09:43:17 -07:00

105 lines
2.0 KiB
C

/*
* linux/drivers/video/fb_sys_read.c - Generic file operations where
* framebuffer is in system RAM
*
* Copyright (C) 2007 Antonino Daplas <adaplas@pol.net>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*
*/
#include <linux/fb.h>
#include <linux/module.h>
#include <linux/uaccess.h>
ssize_t fb_sys_read(struct fb_info *info, char __user *buf, size_t count,
loff_t *ppos)
{
unsigned long p = *ppos;
void *src;
int err = 0;
unsigned long total_size;
if (info->state != FBINFO_STATE_RUNNING)
return -EPERM;
total_size = info->screen_size;
if (total_size == 0)
total_size = info->fix.smem_len;
if (p >= total_size)
return 0;
if (count >= total_size)
count = total_size;
if (count + p > total_size)
count = total_size - p;
src = (void __force *)(info->screen_base + p);
if (info->fbops->fb_sync)
info->fbops->fb_sync(info);
if (copy_to_user(buf, src, count))
err = -EFAULT;
if (!err)
*ppos += count;
return (err) ? err : count;
}
EXPORT_SYMBOL_GPL(fb_sys_read);
ssize_t fb_sys_write(struct fb_info *info, const char __user *buf,
size_t count, loff_t *ppos)
{
unsigned long p = *ppos;
void *dst;
int err = 0;
unsigned long total_size;
if (info->state != FBINFO_STATE_RUNNING)
return -EPERM;
total_size = info->screen_size;
if (total_size == 0)
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 (info->fbops->fb_sync)
info->fbops->fb_sync(info);
if (copy_from_user(dst, buf, count))
err = -EFAULT;
if (!err)
*ppos += count;
return (err) ? err : count;
}
EXPORT_SYMBOL_GPL(fb_sys_write);
MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
MODULE_DESCRIPTION("Generic file read (fb in system RAM)");
MODULE_LICENSE("GPL");