Release 4.11 drivers/video/fbdev/core/fb_sys_fops.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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Antonino A. Daplas | 174 | 100.00% | 1 | 100.00% |
| Total | 174 | 100.00% | 1 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Antonino A. Daplas | 195 | 100.00% | 1 | 100.00% |
| Total | 195 | 100.00% | 1 | 100.00% |
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");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Antonino A. Daplas | 403 | 99.75% | 1 | 50.00% |
| Krzysztof Helt | 1 | 0.25% | 1 | 50.00% |
| Total | 404 | 100.00% | 2 | 100.00% |
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