diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/video/Kconfig | 5 | ||||
| -rw-r--r-- | drivers/video/Makefile | 1 | ||||
| -rw-r--r-- | drivers/video/fb_sys_fops.c | 104 |
3 files changed, 110 insertions, 0 deletions
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index 6d32726e875..85d0e8707ee 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -122,6 +122,11 @@ config FB_SYS_IMAGEBLIT blitting. This is used by drivers that don't provide their own (accelerated) version and the framebuffer is in system RAM. +config FB_SYS_FOPS + tristate + depends on FB + default n + config FB_DEFERRED_IO bool depends on FB diff --git a/drivers/video/Makefile b/drivers/video/Makefile index fa025e78684..6c7b26e81fc 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -21,6 +21,7 @@ obj-$(CONFIG_FB_CFB_IMAGEBLIT) += cfbimgblt.o obj-$(CONFIG_FB_SYS_FILLRECT) += sysfillrect.o obj-$(CONFIG_FB_SYS_COPYAREA) += syscopyarea.o obj-$(CONFIG_FB_SYS_IMAGEBLIT) += sysimgblt.o +obj-$(CONFIG_FB_SYS_FOPS) += fb_sys_fops.o obj-$(CONFIG_FB_SVGALIB) += svgalib.o obj-$(CONFIG_FB_MACMODES) += macmodes.o obj-$(CONFIG_FB_DDC) += fb_ddc.o diff --git a/drivers/video/fb_sys_fops.c b/drivers/video/fb_sys_fops.c new file mode 100644 index 00000000000..cf2538d669c --- /dev/null +++ b/drivers/video/fb_sys_fops.c @@ -0,0 +1,104 @@ +/* + * 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 <asm/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"); |