LCD驱动 15-1

app:  read()    

--------------------------------------------------------------------------------------------

kernel:

  fb_read

    int fbidx = iminor(inode);

    struct fb_info *info = registered_fb[fbidx];

    if (info->fbops->fb_read)         return info->fbops->fb_read(info, buf, count, ppos);

    src = (u32 __iomem *) (info->screen_base + p);      dst = buffer;

    *dst++ = fb_readl(src++);

    copy_to_user(buf, buffer, c)

 

问:registered_fb【】在谁来设置

答:register_framebuffer

 

怎么写LCD驱动程序呢?

1.分配一个fb_info结构体: framebuffer_alloc

2.设置

3.注册

4.硬件相关操

posted @ 2016-01-28 20:09  CAM&  阅读(153)  评论(0编辑  收藏  举报