N329 framebuffer 分析

下图Framebuffer在Linux系统中的结构图:
1. static const struct file_operations
ioctl/mmap/write/read

2. Struct fb_info
3. Static Struct fb_ops
Fb_open/fb_write/fb_release/fb_ioctl/fb_set_par/fb_check_var/fb_setcolreg

4. Int register_framebuffer(struct fb_info *fb_info);
Int unregister_framebuffer(struct fb_info *fb_info);

framebuffer是个字符设备,主设备号为29,对应于/dev/fb%d 设备文件