分类： 嵌入式
2013-03-19 14:54:08
struct fb_info {
int node;
int flags;
struct fb_var_screeninfo var; /* Current var *//*可变参数*/
struct fb_fix_screeninfo fix; /* Current fix *//*固定参数*/
struct fb_monspecs monspecs; /* Current Monitor specs *//*显示器特有的固定信息*/
struct work_struct queue; /* Framebuffer event queue *//*帧缓冲事件队列*/
struct fb_pixmap pixmap; /* Image hardware mapper *//*图像硬件mapper*/
struct fb_pixmap sprite; /* Cursor hardware mapper *//*光标硬件mapper*/
struct fb_cmap cmap; /* Current cmap *//*当前的颜色表*/
struct list_head modelist; /* mode list *//
struct fb_videomode *mode; /* current mode */ /*当前的显示模式*/
#ifdef CONFIG_FB_BACKLIGHT
/* assigned backlight device *//*对应的背光设备*/
/* set before framebuffer registration,
remove after unregister */
struct backlight_device *bl_dev;
/* Backlight level curve */
struct mutex bl_curve_mutex;
u8 bl_curve[FB_BACKLIGHT_LEVELS];/*背光调整*/
#endif
#ifdef CONFIG_FB_DEFERRED_IO
struct delayed_work deferred_work;
struct fb_deferred_io *fbdefio;
#endif
struct fb_ops *fbops;/*对底层硬件操作的函数指针*/
struct device *device; /* This is the parent */
struct device *dev; /* This is this fb device */ /*fb设备*/
int class_flag; /* private sysfs flags */
#ifdef CONFIG_FB_TILEBLITTING
struct fb_tile_ops *tileops; /* Tile Blitting *//*图块Blitting*/
#endif
char __iomem *screen_base; /* Virtual address *//*虚拟基地址*/
unsigned long screen_size; /* Amount of ioremapped VRAM or 0 */ /*LCD IO映射的虚拟内存大小*/
void *pseudo_palette; /* Fake palette of 16 colors */ /*伪16色颜色表*/
#define FBINFO_STATE_RUNNING 0
#define FBINFO_STATE_SUSPENDED 1
u32 state; /* Hardware state i.e suspend *//*LCD的挂起或恢复状态*/
void *fbcon_par; /* fbcon use-only private area */
/* From here on everything is device dependent */
void *par;
};
struct fb_var_screeninfo {
__u32 xres; /*可见屏幕一行有多少个像素点*/
__u32 yres; /*可见屏幕一列有多少个像素点*/
__u32 xres_virtual; /*虚拟屏幕一行有多少个像素点*/
__u32 yres_virtual; /*虚拟屏幕一列有多少个像素点*/
__u32 xoffset; /*虚拟到可见屏幕之间的行偏移*/
__u32 yoffset; /*虚拟到可见屏幕之间的列偏移*/
__u32 bits_per_pixel; /*每个像素的位数即BPP*/
__u32 grayscale; /*非0时，指的是灰度*/
struct fb_bitfield red; /*fb缓存的R位域*/
struct fb_bitfield green; /*fb缓存的G位域*/
struct fb_bitfield blue; /*fb缓存的B位域*/
struct fb_bitfield transp; /*透明度*/
__u32 nonstd; /* != 0 非标准像素格式*/
__u32 activate;
__u32 height; /*高度*/
__u32 width; /*宽度*/
__u32 accel_flags;
/*定时：除了pixclock本身外，其他的都以像素时钟为单位*/
__u32 pixclock; /*像素时钟(皮秒)*/
__u32 left_margin; /*行切换，从同步到绘图之间的延迟*/
__u32 right_margin; /*行切换，从绘图到同步之间的延迟*/
__u32 upper_margin; /*帧切换，从同步到绘图之间的延迟*/
__u32 lower_margin; /*帧切换，从绘图到同步之间的延迟*/
__u32 hsync_len; /*水平同步的长度*/
__u32 vsync_len; /*垂直同步的长度*/
__u32 sync;
__u32 vmode;
__u32 rotate;
__u32 reserved[5]; /*保留*/
};
struct fb_fix_screeninfo {
char id[16]; /*字符串形式的标示符 */
unsigned long smem_start; /*fb缓存的开始位置 */
__u32 smem_len; /*fb缓存的长度 */
__u32 type; /*看FB_TYPE_* */
__u32 type_aux; /*分界*/
__u32 visual; /*看FB_VISUAL_* */
__u16 xpanstep; /*如果没有硬件panning就赋值为0 */
__u16 ypanstep; /*如果没有硬件panning就赋值为0 */
__u16 ywrapstep; /*如果没有硬件ywrap就赋值为0 */
__u32 line_length; /*一行的字节数 */
unsigned long mmio_start; /*内存映射IO的开始位置*/
__u32 mmio_len; /*内存映射IO的长度*/
__u32 accel;
__u16 reserved[3]; /*保留*/
};
struct fb_ops {
struct module *owner;
//检查可变参数并进行设置
int (*fb_check_var)(struct fb_var_screeninfo *var, struct fb_info *info);
//根据设置的值进行更新，使之有效
int (*fb_set_par)(struct fb_info *info);
//设置颜色寄存器
int (*fb_setcolreg)(unsigned regno, unsigned red, unsigned green,
unsigned blue, unsigned transp, struct fb_info *info);
//显示空白
int (*fb_blank)(int blank, struct fb_info *info);
//矩形填充
void (*fb_fillrect) (struct fb_info *info, const struct fb_fillrect *rect);
//复制数据
void (*fb_copyarea) (struct fb_info *info, const struct fb_copyarea *region);
//图形填充
void (*fb_imageblit) (struct fb_info *info, const struct fb_image *image);
};
