diff options
Diffstat (limited to 'drivers/video/fbdev/core/fb_io_fops.c')
| -rw-r--r-- | drivers/video/fbdev/core/fb_io_fops.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/video/fbdev/core/fb_io_fops.c b/drivers/video/fbdev/core/fb_io_fops.c index 871b829521af..60805e43914e 100644 --- a/drivers/video/fbdev/core/fb_io_fops.c +++ b/drivers/video/fbdev/core/fb_io_fops.c @@ -132,5 +132,32 @@ ssize_t fb_io_write(struct fb_info *info, const char __user *buf, size_t count, } EXPORT_SYMBOL(fb_io_write); +int fb_io_mmap(struct fb_info *info, struct vm_area_struct *vma) +{ + unsigned long start = info->fix.smem_start; + u32 len = info->fix.smem_len; + unsigned long mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT; + + /* + * This can be either the framebuffer mapping, or if pgoff points + * past it, the mmio mapping. + */ + if (vma->vm_pgoff >= mmio_pgoff) { + if (info->var.accel_flags) + return -EINVAL; + + vma->vm_pgoff -= mmio_pgoff; + start = info->fix.mmio_start; + len = info->fix.mmio_len; + } + + vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); + vma->vm_page_prot = pgprot_framebuffer(vma->vm_page_prot, vma->vm_start, + vma->vm_end, start); + + return vm_iomap_memory(vma, start, len); +} +EXPORT_SYMBOL(fb_io_mmap); + MODULE_DESCRIPTION("Fbdev helpers for framebuffers in I/O memory"); MODULE_LICENSE("GPL"); |