由于现在正在进行framebuffer的一个项目开发，所以需要学习framebuffer的内核代码，今天现在这里上传我的相关注释，后面再将我的学习内容和相关framebuffer的操作提交上来．
位置：源代码根目录/include/linux/fb.h
#ifndef _LINUX_FB_H
#define _LINUX_FB_H
#include <linux/types.h>
#include <linux/i2c.h>
struct dentry;
/* Definitions of frame buffers frame buffer的定义 */
#define FB_MAX 32 /* sufficient for now 对于现在来说足够了 */
/* ioctls
0x46 is 'F' */
#define FBIOGET_VSCREENINFO 0x4600
#define FBIOPUT_VSCREENINFO 0x4601
#define FBIOGET_FSCREENINFO 0x4602
#define FBIOGETCMAP 0x4604
#define FBIOPUTCMAP 0x4605
#define FBIOPAN_DISPLAY 0x4606
#ifdef __KERNEL__
#define FBIO_CURSOR _IOWR('F', 0x08, struct fb_cursor_user)
#else
#define FBIO_CURSOR _IOWR('F', 0x08, struct fb_cursor)
#endif
/* 0x4607-0x460B are defined below */
/* #define FBIOGET_MONITORSPEC 0x460C */
/* #define FBIOPUT_MONITORSPEC 0x460D */
/* #define FBIOSWITCH_MONIBIT 0x460E */
#define FBIOGET_CON2FBMAP 0x460F
#define FBIOPUT_CON2FBMAP 0x4610
#define FBIOBLANK 0x4611 /* arg: 0 or vesa level + 1 */
#define FBIOGET_VBLANK _IOR('F', 0x12, struct fb_vblank)
#define FBIO_ALLOC 0x4613
#define FBIO_FREE 0x4614
#define FBIOGET_GLYPH 0x4615
#define FBIOGET_HWCINFO 0x4616
#define FBIOPUT_MODEINFO 0x4617
#define FBIOGET_DISPINFO 0x4618
#define FB_TYPE_PACKED_PIXELS 0 /* Packed Pixels 填充的像素 */
#define FB_TYPE_PLANES 1 /* Non interleaved planes 非交错平面 */
#define FB_TYPE_INTERLEAVED_PLANES 2 /* Interleaved planes 交错的平面 */
#define FB_TYPE_TEXT 3 /* Text/attributes 文本/属性 */
#define FB_TYPE_VGA_PLANES 4 /* EGA/VGA planes EGA/VGA 平面 */
#define FB_AUX_TEXT_MDA 0 /* Monochrome text 单色文本 */
#define FB_AUX_TEXT_CGA 1 /* CGA/EGA/VGA Color text CGA/EGA/VGA色彩文本 */
#define FB_AUX_TEXT_S3_MMIO 2 /* S3 MMIO fasttext */
#define FB_AUX_TEXT_MGA_STEP16 3 /* MGA Millenium I: text, attr, 14 reserved bytes */
#define FB_AUX_TEXT_MGA_STEP8 4 /* other MGAs: text, attr, 6 reserved bytes */
#define FB_AUX_TEXT_SVGA_GROUP 8 /* 8-15: SVGA tileblit compatible modes */
#define FB_AUX_TEXT_SVGA_MASK 7 /* lower three bits says step */
#define FB_AUX_TEXT_SVGA_STEP2 8 /* SVGA text mode: text, attr */
#define FB_AUX_TEXT_SVGA_STEP4 9 /* SVGA text mode: text, attr, 2 reserved bytes */
#define FB_AUX_TEXT_SVGA_STEP8 10 /* SVGA text mode: text, attr, 6 reserved bytes */
#define FB_AUX_TEXT_SVGA_STEP16 11 /* SVGA text mode: text, attr, 14 reserved bytes */
#define FB_AUX_TEXT_SVGA_LAST 15 /* reserved up to 15 */
#define FB_AUX_VGA_PLANES_VGA4 0 /* 16 color planes (EGA/VGA) */
#define FB_AUX_VGA_PLANES_CFB4 1 /* CFB4 in planes (VGA) */
#define FB_AUX_VGA_PLANES_CFB8 2 /* CFB8 in planes (VGA) */
#define FB_VISUAL_MONO01 0 /* Monochr. 1=Black 0=White 1=黑色，２＝白色*/
#define FB_VISUAL_MONO10 1 /* Monochr. 1=White 0=Black 1=白色，２＝黑色*/
#define FB_VISUAL_TRUECOLOR 2 /* True color 真实的颜色 */
#define FB_VISUAL_PSEUDOCOLOR 3 /* Pseudo color (like atari) 伪颜色*/
#define FB_VISUAL_DIRECTCOLOR 4 /* Direct color 直接颜色 */
#define FB_VISUAL_STATIC_PSEUDOCOLOR 5 /* Pseudo color readonly 只读伪颜色*/
#define FB_ACCEL_NONE 0 /* no hardware accelerator 没有硬件加速 */
#define FB_ACCEL_ATARIBLITT 1 /* Atari Blitter */
#define FB_ACCEL_AMIGABLITT 2 /* Amiga Blitter */
#define FB_ACCEL_S3_TRIO64 3 /* Cybervision64 (S3 Trio64) */
#define FB_ACCEL_NCR_77C32BLT 4 /* RetinaZ3 (NCR 77C32BLT) */
#define FB_ACCEL_S3_VIRGE 5 /* Cybervision64/3D (S3 ViRGE) */
#define FB_ACCEL_ATI_MACH64GX 6 /* ATI Mach 64GX family */
#define FB_ACCEL_DEC_TGA 7 /* DEC 21030 TGA */
#define FB_ACCEL_ATI_MACH64CT 8 /* ATI Mach 64CT family */
#define FB_ACCEL_ATI_MACH64VT 9 /* ATI Mach 64CT family VT class */
#define FB_ACCEL_ATI_MACH64GT 10 /* ATI Mach 64CT family GT class */
#define FB_ACCEL_SUN_CREATOR 11 /* Sun Creator/Creator3D */
#define FB_ACCEL_SUN_CGSIX 12 /* Sun cg6 */
#define FB_ACCEL_SUN_LEO 13 /* Sun leo/zx */
#define FB_ACCEL_IMS_TWINTURBO 14 /* IMS Twin Turbo */
#define FB_ACCEL_3DLABS_PERMEDIA2 15 /* 3Dlabs Permedia 2 */
#define FB_ACCEL_MATROX_MGA2064W 16 /* Matrox MGA2064W (Millenium) */
#define FB_ACCEL_MATROX_MGA1064SG 17 /* Matrox MGA1064SG (Mystique) */
#define FB_ACCEL_MATROX_MGA2164W 18 /* Matrox MGA2164W (Millenium II) */
#define FB_ACCEL_MATROX_MGA2164W_AGP 19 /* Matrox MGA2164W (Millenium II) */
#define FB_ACCEL_MATROX_MGAG100 20 /* Matrox G100 (Productiva G100) */
#define FB_ACCEL_MATROX_MGAG200 21 /* Matrox G200 (Myst, Mill, ...) */
#define FB_ACCEL_SUN_CG14 22 /* Sun cgfourteen */
#define FB_ACCEL_SUN_BWTWO 23 /* Sun bwtwo */
#define FB_ACCEL_SUN_CGTHREE 24 /* Sun cgthree */
#define FB_ACCEL_SUN_TCX 25 /* Sun tcx */
#define FB_ACCEL_MATROX_MGAG400 26 /* Matrox G400 */
#define FB_ACCEL_NV3 27 /* nVidia RIVA 128 */
#define FB_ACCEL_NV4 28 /* nVidia RIVA TNT */
#define FB_ACCEL_NV5 29 /* nVidia RIVA TNT2 */
#define FB_ACCEL_CT_6555x 30 /* C&T 6555x */
#define FB_ACCEL_3DFX_BANSHEE 31 /* 3Dfx Banshee */
#define FB_ACCEL_ATI_RAGE128 32 /* ATI Rage128 family */
#define FB_ACCEL_IGS_CYBER2000 33 /* CyberPro 2000 */
#define FB_ACCEL_IGS_CYBER2010 34 /* CyberPro 2010 */
#define FB_ACCEL_IGS_CYBER5000 35 /* CyberPro 5000 */
#define FB_ACCEL_SIS_GLAMOUR 36 /* SiS 300/630/540 */
#define FB_ACCEL_3DLABS_PERMEDIA3 37 /* 3Dlabs Permedia 3 */
#define FB_ACCEL_ATI_RADEON 38 /* ATI Radeon family */
#define FB_ACCEL_I810 39 /* Intel 810/815 */
#define FB_ACCEL_SIS_GLAMOUR_2 40 /* SiS 315, 650, 740 */
#define FB_ACCEL_SIS_XABRE 41 /* SiS 330 ("Xabre") */
#define FB_ACCEL_I830 42 /* Intel 830M/845G/85x/865G */
#define FB_ACCEL_NV_10 43 /* nVidia Arch 10 */
#define FB_ACCEL_NV_20 44 /* nVidia Arch 20 */
#define FB_ACCEL_NV_30 45 /* nVidia Arch 30 */
#define FB_ACCEL_NV_40 46 /* nVidia Arch 40 */
#define FB_ACCEL_XGI_VOLARI_V 47 /* XGI Volari V3XT, V5, V8 */
#define FB_ACCEL_XGI_VOLARI_Z 48 /* XGI Volari Z7 */
#define FB_ACCEL_OMAP1610 49 /* TI OMAP16xx */
#define FB_ACCEL_TRIDENT_TGUI 50 /* Trident TGUI */
#define FB_ACCEL_TRIDENT_3DIMAGE 51 /* Trident 3DImage */
#define FB_ACCEL_TRIDENT_BLADE3D 52 /* Trident Blade3D */
#define FB_ACCEL_TRIDENT_BLADEXP 53 /* Trident BladeXP */
#define FB_ACCEL_CIRRUS_ALPINE 53 /* Cirrus Logic 543x/544x/5480 */
#define FB_ACCEL_NEOMAGIC_NM2070 90 /* NeoMagic NM2070 */
#define FB_ACCEL_NEOMAGIC_NM2090 91 /* NeoMagic NM2090 */
#define FB_ACCEL_NEOMAGIC_NM2093 92 /* NeoMagic NM2093 */
#define FB_ACCEL_NEOMAGIC_NM2097 93 /* NeoMagic NM2097 */
#define FB_ACCEL_NEOMAGIC_NM2160 94 /* NeoMagic NM2160 */
#define FB_ACCEL_NEOMAGIC_NM2200 95 /* NeoMagic NM2200 */
#define FB_ACCEL_NEOMAGIC_NM2230 96 /* NeoMagic NM2230 */
#define FB_ACCEL_NEOMAGIC_NM2360 97 /* NeoMagic NM2360 */
#define FB_ACCEL_NEOMAGIC_NM2380 98 /* NeoMagic NM2380 */
#define FB_ACCEL_PXA3XX 99 /* PXA3xx */
#define FB_ACCEL_SAVAGE4 0x80 /* S3 Savage4 */
#define FB_ACCEL_SAVAGE3D 0x81 /* S3 Savage3D */
#define FB_ACCEL_SAVAGE3D_MV 0x82 /* S3 Savage3D-MV */
#define FB_ACCEL_SAVAGE2000 0x83 /* S3 Savage2000 */
#define FB_ACCEL_SAVAGE_MX_MV 0x84 /* S3 Savage/MX-MV */
#define FB_ACCEL_SAVAGE_MX 0x85 /* S3 Savage/MX */
#define FB_ACCEL_SAVAGE_IX_MV 0x86 /* S3 Savage/IX-MV */
#define FB_ACCEL_SAVAGE_IX 0x87 /* S3 Savage/IX */
#define FB_ACCEL_PROSAVAGE_PM 0x88 /* S3 ProSavage PM133 */
#define FB_ACCEL_PROSAVAGE_KM 0x89 /* S3 ProSavage KM133 */
#define FB_ACCEL_S3TWISTER_P 0x8a /* S3 Twister */
#define FB_ACCEL_S3TWISTER_K 0x8b /* S3 TwisterK */
#define FB_ACCEL_SUPERSAVAGE 0x8c /* S3 Supersavage */
#define FB_ACCEL_PROSAVAGE_DDR 0x8d /* S3 ProSavage DDR */
#define FB_ACCEL_PROSAVAGE_DDRK 0x8e /* S3 ProSavage DDR-K */
/**
* 该结构体用于描述显卡自身的属性
* 包括识别符，缓存地址，显卡类型等
*
*/
struct fb_fix_screeninfo {
char id[16]; /* identification string eg "TT Builtin" 标识符字符串*/
unsigned long smem_start; /* Start of frame buffer mem frame buffer所占内存的开始地址 */
/* (physical address) 这里说的是物理地址 */
__u32 smem_len; /* Length of frame buffer mem frame buffer所占内存的长度 */
__u32 type; /* see FB_TYPE_* 查看FB_BYTE_* */
__u32 type_aux; /* Interleave for interleaved Planes 交织交错的平面 */
__u32 visual; /* see FB_VISUAL_* 查看FB_VISUAL_* */
__u16 xpanstep; /* zero if no hardware panning 如何没有硬件支持的话为0 */
__u16 ypanstep; /* zero if no hardware panning 如果没有硬件支持的话为０*/
__u16 ywrapstep; /* zero if no hardware ywrap 如果没有硬件ywrap的话为０ */
__u32 line_length; /* length of a line in bytes 一行的长度，以byte为单位 */
unsigned long mmio_start; /* Start of Memory Mapped I/O 映射到I/O的内存的开始地址 */
/* (physical address) 物理地址*/
__u32 mmio_len; /* Length of Memory Mapped I/O 映射到I/O的内存长度*/
__u32 accel; /* Indicate to driver which 指示到驱动程序 */
/* specific chip/card we have 特别是我们拥有的芯片/卡*/
__u16 reserved[3]; /* Reserved for future compatibility 为后来的兼容性保留*/
};
/* Interpretation of offset for color fields: All offsets are from the right,
* inside a "pixel" value, which is exactly 'bits_per_pixel' wide (means: you
* can use the offset as right argument to <<). A pixel afterwards is a bit
* stream and is written to video memory as that unmodified.
*
* 色域偏移的解释：所有的偏移量都来自于右边，在一个＂像素＂值里面，实际上是'bits_per_pixel'
* 的宽度（也就是说：你可以使用该偏移量作为 << 的右参数）．一个像素之后是一个位流，并且
* 作为未被修改而被写到视频内存中．
*
* For pseudocolor: offset and length should be the same for all color
* components. Offset specifies the position of the least significant bit
* of the pallette index in a pixel value. Length indicates the number
* of available palette entries (i.e. # of entries = 1 << length).
*
* 对于伪色彩来说：对于所有的颜色部分，偏移量和长度应该是相同的．偏移量指定了
* 在一个像素值里的调色板索引的最低有效位的位置．长度指明了可用的调色板入口的
* 数量．
*/
struct fb_bitfield {
__u32 offset; /* 位域的开始 */
__u32 length; /* length of bitfield 位域的长度 */
__u32 msb_right; /* != 0 : Most significant bit is 不等于０，大多数重要的位是右边的 */
/* right */
};
#define FB_NONSTD_HAM 1 /* Hold-And-Modify (HAM) 保持和修改 */
#define FB_NONSTD_REV_PIX_IN_B 2 /* order of pixels in each byte is reversed 在每一个字节中的像素的顺序被保留下来 */
#define FB_ACTIVATE_NOW 0 /* set values immediately (or vbl) 立即设定颜色 */
#define FB_ACTIVATE_NXTOPEN 1 /* activate on next open 在下一个打开的时候激活 */
#define FB_ACTIVATE_TEST 2 /* don't set, round up impossible 不设置 */
#define FB_ACTIVATE_MASK 15
/* values */
#define FB_ACTIVATE_VBL 16 /* activate values on next vbl 在下一个vbl的时候激活值 */
#define FB_CHANGE_CMAP_VBL 32 /* change colormap on vbl 在vbl的时候改变色彩映射 */
#define FB_ACTIVATE_ALL 64 /* change all VCs on this fb 在这个fb中改变所有的VC */
#define FB_ACTIVATE_FORCE 128 /* force apply even when no change */
#define FB_ACTIVATE_INV_MODE 256 /* invalidate videomode 即使在没有改变无效视频模式的时候强制应用 */
#define FB_ACCELF_TEXT 1 /* (OBSOLETE) see fb_info.flags and vc_mode 已过时 */
#define FB_SYNC_HOR_HIGH_ACT 1 /* horizontal sync high active 高活性水平同步 */
#define FB_SYNC_VERT_HIGH_ACT 2 /* vertical sync high active 高活性垂直同步 */
#define FB_SYNC_EXT 4 /* external sync 外部同步 */
#define FB_SYNC_COMP_HIGH_ACT 8 /* composite sync high active 高活性复合同步 */
#define FB_SYNC_BROADCAST 16 /* broadcast video timings 广播视频时序 */
/* vtotal = 144d/288n/576i => PAL */
/* vtotal = 121d/242n/484i => NTSC */
#define FB_SYNC_ON_GREEN 32 /* sync on green 在绿色下同步 */
#define FB_VMODE_NONINTERLACED 0 /* non interlaced 非交错模式 */
#define FB_VMODE_INTERLACED 1 /* interlaced 交错模式 */
#define FB_VMODE_DOUBLE 2 /* double scan 双扫描模式 */
#define FB_VMODE_ODD_FLD_FIRST 4 /* interlaced: top line first 交错的：顶行优先 */
#define FB_VMODE_MASK 255
#define FB_VMODE_YWRAP 256 /* ywrap instead of panning ywrap而不是panning */
#define FB_VMODE_SMOOTH_XPAN 512 /* smooth xpan possible (internally used) 平滑的xpan(内部使用) */
#define FB_VMODE_CONUPDATE 512 /* don't update x/yoffset 不要更新 x/yoffset*/
/*
* Display rotation support
*
* 旋转支持显示
*/
#define FB_ROTATE_UR 0
#define FB_ROTATE_CW 1
#define FB_ROTATE_UD 2
#define FB_ROTATE_CCW 3
#define PICOS2KHZ(a) (1000000000UL/(a))
#define KHZ2PICOS(a) (1000000000UL/(a))
/**
* 用于描述显卡的一般特性，比如实际分辨率，虚拟分辨率，实际分辨率和虚拟
* 分辨率之间的位移等
*/
struct fb_var_screeninfo {
__u32 xres; /* visible resolution 可见解析度 */
__u32 yres;
__u32 xres_virtual; /* virtual resolution 虚拟解析度 */
__u32 yres_virtual;
__u32 xoffset; /* offset from virtual to visible 虚拟到可见的偏移量 */
__u32 yoffset; /* resolution */
__u32 bits_per_pixel; <span class="hljs-comment">/* guess what BPP : 每个像素的位数 */</span>
__u32 grayscale; <span class="hljs-comment">/* != 0 Graylevels instead of colors !=０指灰度而不是颜色 */</span>
<span class="hljs-comment">//如果是真实的颜色的话表示在fb内存中的位域，如果不是颜色的话，仅仅就是长度</span>
<span class="hljs-comment">//在这里保存的是fb缓存的R/G/B位域</span>
<span class="hljs-keyword">struct</span> fb_bitfield red; <span class="hljs-comment">/* bitfield in fb mem if true color, */</span>
<span class="hljs-keyword">struct</span> fb_bitfield green; <span class="hljs-comment">/* else only length is significant */</span>
<span class="hljs-keyword">struct</span> fb_bitfield blue;
<span class="hljs-keyword">struct</span> fb_bitfield transp; <span class="hljs-comment">/* transparency 透明度 */</span>
__u32 nonstd; <span class="hljs-comment">/* != 0 Non standard pixel format !=0 非标准像素格式 */</span>
__u32 activate; <span class="hljs-comment">/* see FB_ACTIVATE_* 查看FB_ACTIVATE_* */</span>
__u32 height; <span class="hljs-comment">/* height of picture in mm 在内存中图片的高度 */</span>
__u32 width; <span class="hljs-comment">/* width of picture in mm 在内存中图片的宽度 */</span>
__u32 accel_flags; <span class="hljs-comment">/* (OBSOLETE) see fb_info.flags 已过时*/</span>
<span class="hljs-comment">/* Timing: All values in pixclocks, except pixclock (of course) */</span>
<span class="hljs-comment">/* 除了pixclock本身外，其他的都已pixclock为单位*/</span>
__u32 pixclock; <span class="hljs-comment">/* pixel clock in ps (pico seconds) 像素时钟（皮秒）*/</span>
__u32 left_margin; <span class="hljs-comment">/* time from sync to picture 行切换：从绘图到同步之间的延迟 */</span>
__u32 right_margin; <span class="hljs-comment">/* time from picture to sync 行切换：从绘图到同步之间的延迟 */</span>
__u32 upper_margin; <span class="hljs-comment">/* time from sync to picture 帧切换：从同步到绘图之间的延迟 */</span>
__u32 lower_margin; <span class="hljs-comment">// 帧切换，从绘图到同步之间的延迟 </span>
__u32 hsync_len; <span class="hljs-comment">/* length of horizontal sync 水平同步的长度 */</span>
__u32 vsync_len; <span class="hljs-comment">/* length of vertical sync 垂直同步的长度 */</span>
__u32 sync; <span class="hljs-comment">/* see FB_SYNC_* 查看FB_SYNC_* */</span>
__u32 vmode; <span class="hljs-comment">/* see FB_VMODE_* 查看 FB_VMODE_* */</span>
__u32 rotate; <span class="hljs-comment">/* angle we rotate counter clockwise 顺时针旋转的角度 */</span>
__u32 reserved[<span class="hljs-number">5</span>]; <span class="hljs-comment">/* Reserved for future compatibility 保留 */</span>
};
/**
* 用于描述设备无关的颜色映射信息
*/
struct fb_cmap {
__u32 start; /* First entry 第一个元素入口 */
__u32 len; /* Number of entries 元素的数量*/
//R,G,B,透明度
__u16 red; / Red values */
__u16 *green;
__u16 *blue;
__u16 transp; / transparency, can be NULL 透明度，可以为空 */
};
struct fb_con2fbmap {
__u32 console;
__u32 framebuffer;
};
/* VESA Blanking Levels */
#define VESA_NO_BLANKING 0
#define VESA_VSYNC_SUSPEND 1
#define VESA_HSYNC_SUSPEND 2
#define VESA_POWERDOWN 3
enum {
/* screen: unblanked, hsync: on, vsync: on */
FB_BLANK_UNBLANK = VESA_NO_BLANKING,
<span class="hljs-comment">/* screen: blanked, hsync: on, vsync: on */</span>
FB_BLANK_NORMAL = VESA_NO_BLANKING + <span class="hljs-number">1</span>,
<span class="hljs-comment">/* screen: blanked, hsync: on, vsync: off */</span>
FB_BLANK_VSYNC_SUSPEND = VESA_VSYNC_SUSPEND + <span class="hljs-number">1</span>,
<span class="hljs-comment">/* screen: blanked, hsync: off, vsync: on */</span>
FB_BLANK_HSYNC_SUSPEND = VESA_HSYNC_SUSPEND + <span class="hljs-number">1</span>,
<span class="hljs-comment">/* screen: blanked, hsync: off, vsync: off */</span>
FB_BLANK_POWERDOWN = VESA_POWERDOWN + <span class="hljs-number">1</span>
};
#define FB_VBLANK_VBLANKING 0x001 /* currently in a vertical blank */
#define FB_VBLANK_HBLANKING 0x002 /* currently in a horizontal blank */
#define FB_VBLANK_HAVE_VBLANK 0x004 /* vertical blanks can be detected */
#define FB_VBLANK_HAVE_HBLANK 0x008 /* horizontal blanks can be detected */
#define FB_VBLANK_HAVE_COUNT 0x010 /* global retrace counter is available */
#define FB_VBLANK_HAVE_VCOUNT 0x020 /* the vcount field is valid */
#define FB_VBLANK_HAVE_HCOUNT 0x040 /* the hcount field is valid */
#define FB_VBLANK_VSYNCING 0x080 /* currently in a vsync */
#define FB_VBLANK_HAVE_VSYNC 0x100 /* verical syncs can be detected */
struct fb_vblank {
__u32 flags; /* FB_VBLANK flags FB_VBLANK标志 */
__u32 count; /* counter of retraces since boot 启动之后追溯的次数 */
__u32 vcount; /* current scanline position 当前扫描行位置 */
__u32 hcount; /* current scandot position 当前扫描点位置 */
__u32 reserved[4]; /* reserved for future compatibility 保留 */
};
/* Internal HW accel 内部硬件加速 */
#define ROP_COPY 0
#define ROP_XOR 1
//复制区域
struct fb_copyarea {
__u32 dx;
__u32 dy;
__u32 width;
__u32 height;
__u32 sx;
__u32 sy;
};
//回执矩形
struct fb_fillrect {
__u32 dx; /* screen-relative 屏幕相关 */
__u32 dy;
__u32 width;
__u32 height;
__u32 color;
__u32 rop;
};
struct fb_image {
__u32 dx; /* Where to place image 图像放在哪里 */
__u32 dy;
__u32 width; /* Size of image 图像的宽度和高度 */
__u32 height;
__u32 fg_color; /* Only used when a mono bitmap 仅仅是单色图像的时候使用 */
__u32 bg_color;
__u8 depth; /* Depth of the image 图像的深度 */
const char data; / Pointer to image data 指向图像数据的指针 */
struct fb_cmap cmap; /* color map info 颜色映射信息 */
};
/*
* hardware cursor control
* 硬件光标控制
*/
#define FB_CUR_SETIMAGE 0x01
#define FB_CUR_SETPOS 0x02
#define FB_CUR_SETHOT 0x04
#define FB_CUR_SETCMAP 0x08
#define FB_CUR_SETSHAPE 0x10
#define FB_CUR_SETSIZE 0x20
#define FB_CUR_SETALL 0xFF
// 光标位置
struct fbcurpos {
__u16 x, y;
};
struct fb_cursor {
__u16 set; /* what to set 设置成什么 */
__u16 enable; /* cursor on/off 光标打开/关闭 */
__u16 rop; /* bitop operation 位操作 */
const char mask; / cursor mask bits 光标掩码位 */
struct fbcurpos hot; /* cursor hot spot 光标热点 */
struct fb_image image; /* Cursor image 光标图像 */
};
#ifdef CONFIG_FB_BACKLIGHT
/* Settings for the generic backlight code */
#define FB_BACKLIGHT_LEVELS 128
#define FB_BACKLIGHT_MAX 0xFF
#endif
#ifdef KERNEL
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/workqueue.h>
#include <linux/notifier.h>
#include <linux/list.h>
#include <linux/backlight.h>
#include <asm/io.h>
struct vm_area_struct;
struct fb_info;
struct device;
struct file;
/* Definitions below are used in the parsed monitor specs */
#define FB_DPMS_ACTIVE_OFF 1
#define FB_DPMS_SUSPEND 2
#define FB_DPMS_STANDBY 4
#define FB_DISP_DDI 1
#define FB_DISP_ANA_700_300 2
#define FB_DISP_ANA_714_286 4
#define FB_DISP_ANA_1000_400 8
#define FB_DISP_ANA_700_000 16
#define FB_DISP_MONO 32
#define FB_DISP_RGB 64
#define FB_DISP_MULTI 128
#define FB_DISP_UNKNOWN 256
#define FB_SIGNAL_NONE 0
#define FB_SIGNAL_BLANK_BLANK 1
#define FB_SIGNAL_SEPARATE 2
#define FB_SIGNAL_COMPOSITE 4
#define FB_SIGNAL_SYNC_ON_GREEN 8
#define FB_SIGNAL_SERRATION_ON 16
#define FB_MISC_PRIM_COLOR 1
#define FB_MISC_1ST_DETAIL 2 /* First Detailed Timing is preferred 第一次详细的时间是首选 */
struct fb_chroma {
__u32 redx; /* in fraction of 1024 1024的一小部分 */
__u32 greenx;
__u32 bluex;
__u32 whitex;
__u32 redy;
__u32 greeny;
__u32 bluey;
__u32 whitey;
};
struct fb_monspecs {
struct fb_chroma chroma;
struct fb_videomode modedb; / mode database 模式数据库 */
__u8 manufacturer[4]; /* Manufacturer 制造商 */
__u8 monitor[14]; /* Monitor String 监视字符串 */
__u8 serial_no[14]; /* Serial Number 序列号 */
__u8 ascii[14]; /* ? */
__u32 modedb_len; /* mode database length 模式数据库长度 */
__u32 model; /* Monitor Model 监视模型 */
__u32 serial; /* Serial Number - Integer 序列号－整数 */
__u32 year; /* Year manufactured 制造年*/
__u32 week; /* Week Manufactured 制造周 */
__u32 hfmin; /* hfreq lower limit (Hz) hfreq最低限制*/
__u32 hfmax; /* hfreq upper limit (Hz) hfreq最高限制*/
__u32 dclkmin; /* pixelclock lower limit (Hz) pixelclock最低限制*/
__u32 dclkmax; /* pixelclock upper limit (Hz) pixelclock最高限制*/
__u16 input; /* display type - see FB_DISP_* 显示类型 - 查看FB_DISP_* */
_u16 dpms; /* DPMS support - see FB_DPMS DPMS支持－查看FB_DPMS_ */
__u16 signal; /* Signal Type - see FB_SIGNAL_* 信号类型 － 查看FB_SIGNAL_* */
__u16 vfmin; /* vfreq lower limit (Hz) vfreq最低限制 */
__u16 vfmax; /* vfreq upper limit (Hz) vfreq最高限制 */
__u16 gamma; /* Gamma - in fractions of 100 100的分数 */
__u16 gtf : 1; /* supports GTF 支持 GTF */
__u16 misc; /* Misc flags - see FB_MISC_* Misc标识 － 查看FB_MISC_* */
__u8 version; /* EDID version… EDID版本 */
__u8 revision; /* …and revision 修订版本 */
__u8 max_x; /* Maximum horizontal size (cm) 最大水平大小 */
__u8 max_y; /* Maximum vertical size (cm) 最大垂直大小 */
};
struct fb_cmap_user {
__u32 start; /* First entry 第一元素入口 */
__u32 len; /* Number of entries 元素的数量 */
//R,G,B和透明度
__u16 __user red; / Red values */
__u16 __user *green;
__u16 __user *blue;
__u16 __user transp; / transparency, can be NULL */
};
struct fb_image_user {
__u32 dx; /* Where to place image */
__u32 dy;
__u32 width; /* Size of image */
__u32 height;
__u32 fg_color; /* Only used when a mono bitmap */
__u32 bg_color;
__u8 depth; /* Depth of the image */
const char __user data; / Pointer to image data */
struct fb_cmap_user cmap; /* color map info */
};
struct fb_cursor_user {
__u16 set; /* what to set */
__u16 enable; /* cursor on/off */
__u16 rop; /* bitop operation */
const char __user mask; / cursor mask bits */
struct fbcurpos hot; /* cursor hot spot */
struct fb_image_user image; /* Cursor image */
};
/*
* Register/unregister for framebuffer events
* framebuffer事件的注册/注销
*/
/* The resolution of the passed in fb_info about to change */
// 在fb_info中通过的分辨率将要改变
#define FB_EVENT_MODE_CHANGE 0x01
/* The display on this fb_info is beeing suspended, no access to the
* framebuffer is allowed any more after that call returns
* 在这个fb_info的显示是被悬挂着的，在那个调用返回之后的对framebuffer
* 的访问是不被允许的．
*/
#define FB_EVENT_SUSPEND 0x02
/* The display on this fb_info was resumed, you can restore the display
* if you own it
* 在这个fb_info中的显示恢复了，如果你拥有他，你可以恢复显示
*
*/
#define FB_EVENT_RESUME 0x03
/* An entry from the modelist was removed */
// 模式列表中的一个元素被移走了
#define FB_EVENT_MODE_DELETE 0x04
/* A driver registered itself */
// 一个驱动注册了他自己
#define FB_EVENT_FB_REGISTERED 0x05
/* A driver unregistered itself */
// 一个驱动注销了他自己
#define FB_EVENT_FB_UNREGISTERED 0x06
/* CONSOLE-SPECIFIC: get console to framebuffer mapping */
// 获取framebuffer映射的控制台
#define FB_EVENT_GET_CONSOLE_MAP 0x07
/* CONSOLE-SPECIFIC: set console to framebuffer mapping */
// 设置framebuffer映射的控制台
#define FB_EVENT_SET_CONSOLE_MAP 0x08
/* A hardware display blank change occured */
// 一个硬件显示空改变发生了
#define FB_EVENT_BLANK 0x09
/* Private modelist is to be replaced */
// 内部的模式列表将被替换
#define FB_EVENT_NEW_MODELIST 0x0A
/* The resolution of the passed in fb_info about to change and
all vc’s should be changed */
// 在fb_info中通过的分辨率将要改变，并且所有的vc应该被改变
#define FB_EVENT_MODE_CHANGE_ALL 0x0B
/* A software display blank change occured */
// 一个软件显示空改变发生了
#define FB_EVENT_CONBLANK 0x0C
/* Get drawing requirements */
// 获取画图需求
#define FB_EVENT_GET_REQ 0x0D
/* Unbind from the console if possible */
// 如果可能的话从控制台中接触绑定
#define FB_EVENT_FB_UNBIND 0x0E
/* CONSOLE-SPECIFIC: remap all consoles to new fb - for vga switcheroo */
// 重新将所有的控制台映射到新的fb – 对于vga switcheroo来说的
#define FB_EVENT_REMAP_ALL_CONSOLE 0x0F
struct fb_event {
struct fb_info *info;
void *data;
};
struct fb_blit_caps {
u32 x;
u32 y;
u32 len;
u32 flags;
};
extern int fb_register_client(struct notifier_block *nb);
extern int fb_unregister_client(struct notifier_block *nb);
extern int fb_notifier_call_chain(unsigned long val, void *v);
/*
* Pixmap structure definition
* Pixmap 结构体定义
* The purpose of this structure is to translate data
* from the hardware independent format of fbdev to what
* format the hardware needs.
* 该结构体的目的就是将数据从fbdev的硬件独立的格式转换成
* 硬件需要的格式
*
*/
#define FB_PIXMAP_DEFAULT 1 /* used internally by fbcon 被fvbcon内部使用*/
#define FB_PIXMAP_SYSTEM 2 /* memory is in system RAM 内存在系统RAM中*/
#define FB_PIXMAP_IO 4 /* memory is iomapped 内存被io映射了*/
#define FB_PIXMAP_SYNC 256 /* set if GPU can DMA 如果GPU能够使用DMA的话设置*/
struct fb_pixmap {
u8 addr; / pointer to memory 指向内存的指针 */
u32 size; /* size of buffer in bytes 缓冲的字节数大小 */
u32 offset; /* current offset to buffer 当前到buffer的偏移量 */
u32 buf_align; /* byte alignment of each bitmap 每一个位图的字节对齐 */
u32 scan_align; /* alignment per scanline 每一个扫描行的对齐 */
u32 access_align; /* alignment per read/write (bits) 每一个读写位的对齐 */
u32 flags; /* see FB_PIXMAP_* 查看FB_PIXMAP_* */
u32 blit_x; /* supported bit block dimensions (1-32) 支持位块尺寸(1-32) */
u32 blit_y; /* Format: blit_x = 1 << (width - 1) */
/* blit_y = 1 << (height - 1) */
/* if 0, will be set to 0xffffffff (all) 如果是０，则被设置为0xffffffff */
/* access methods 访问方法 */
void (*writeio)(struct fb_info *info, void __iomem *dst, void *src, unsigned int size);
void (*readio) (struct fb_info *info, void *dst, void __iomem *src, unsigned int size);
};
#ifdef CONFIG_FB_DEFERRED_IO
struct fb_deferred_io {
/* delay between mkwrite and deferred handler 在mkwrite和延期的处理程序的时间 */
unsigned long delay;
struct mutex lock; /* mutex that protects the page list 保护页列表的互斥锁 */
struct list_head pagelist; /* list of touched pages 被创建的页的列表*/
/* callback 回调函数*/
void (*deferred_io)(struct fb_info *info, struct list_head *pagelist);
};
#endif
/*
* Frame buffer operations
* Frame buffer 的操作
* LOCKING NOTE: those functions must ALL be called with the console
* semaphore held, this is the only suitable locking mechanism we have
* in 2.6. Some may be called at interrupt time at this point though.
* 这些函数必须要使用semaphore锁．
*/
struct fb_ops {
/* open/release and usage marking */
// 打开/释放和使用标记
struct module *owner;
int (*fb_open)(struct fb_info *info, int user);
int (*fb_release)(struct fb_info *info, int user);
<span class="hljs-comment">/* For framebuffers with strange non linear layouts or that do not
* work with normal memory mapped access
* 对于拥有陌生的非线性布局的framebuffer来说，不能使用普通的内存
* 映射访问来工作
*/</span>
ssize_t (*fb_read)(<span class="hljs-keyword">struct</span> fb_info *info, <span class="hljs-keyword">char</span> __user *buf,
size_t count, loff_t *ppos);
ssize_t (*fb_write)(<span class="hljs-keyword">struct</span> fb_info *info, <span class="hljs-keyword">const</span> <span class="hljs-keyword">char</span> __user *buf,
size_t count, loff_t *ppos);
<span class="hljs-comment">/* checks var and eventually tweaks it to something supported,
* DO NOT MODIFY PAR */</span>
<span class="hljs-comment">// 检查var并且事件性的调整到可支持状态．不要修改PAR</span>
<span class="hljs-keyword">int</span> (*fb_check_var)(<span class="hljs-keyword">struct</span> fb_var_screeninfo *<span class="hljs-keyword">var</span>, <span class="hljs-keyword">struct</span> fb_info *info);
<span class="hljs-comment">/* set the video mode according to info->var */</span>
<span class="hljs-comment">// 通过info->var设置视频模式</span>
<span class="hljs-keyword">int</span> (*fb_set_par)(<span class="hljs-keyword">struct</span> fb_info *info);
<span class="hljs-comment">/* set color register */</span>
<span class="hljs-comment">// 设置颜色寄存器</span>
<span class="hljs-keyword">int</span> (*fb_setcolreg)(unsigned regno, unsigned red, unsigned green,
unsigned blue, unsigned transp, <span class="hljs-keyword">struct</span> fb_info *info);
<span class="hljs-comment">/* set color registers in batch */</span>
<span class="hljs-comment">// 批处理设置颜色寄存器</span>
<span class="hljs-keyword">int</span> (*fb_setcmap)(<span class="hljs-keyword">struct</span> fb_cmap *cmap, <span class="hljs-keyword">struct</span> fb_info *info);
<span class="hljs-comment">/* blank display */</span>
<span class="hljs-comment">// 空显示</span>
<span class="hljs-keyword">int</span> (*fb_blank)(<span class="hljs-keyword">int</span> blank, <span class="hljs-keyword">struct</span> fb_info *info);
<span class="hljs-comment">/* pan display */</span>
<span class="hljs-comment">// pan 显示</span>
<span class="hljs-keyword">int</span> (*fb_pan_display)(<span class="hljs-keyword">struct</span> fb_var_screeninfo *<span class="hljs-keyword">var</span>, <span class="hljs-keyword">struct</span> fb_info *info);
<span class="hljs-comment">/* Draws a rectangle */</span>
<span class="hljs-comment">// 绘制一个矩形</span>
<span class="hljs-keyword">void</span> (*fb_fillrect) (<span class="hljs-keyword">struct</span> fb_info *info, <span class="hljs-keyword">const</span> <span class="hljs-keyword">struct</span> fb_fillrect *rect);
<span class="hljs-comment">/* Copy data from area to another */</span>
<span class="hljs-comment">// 从一个区域复制数据到另外一个区域</span>
<span class="hljs-keyword">void</span> (*fb_copyarea) (<span class="hljs-keyword">struct</span> fb_info *info, <span class="hljs-keyword">const</span> <span class="hljs-keyword">struct</span> fb_copyarea *region);
<span class="hljs-comment">/* Draws a image to the display */</span>
<span class="hljs-comment">// 在显示器上绘制一个图像</span>
<span class="hljs-keyword">void</span> (*fb_imageblit) (<span class="hljs-keyword">struct</span> fb_info *info, <span class="hljs-keyword">const</span> <span class="hljs-keyword">struct</span> fb_image *image);
<span class="hljs-comment">/* Draws cursor */</span>
<span class="hljs-comment">// 绘制光标</span>
<span class="hljs-keyword">int</span> (*fb_cursor) (<span class="hljs-keyword">struct</span> fb_info *info, <span class="hljs-keyword">struct</span> fb_cursor *cursor);
<span class="hljs-comment">/* Rotates the display */</span>
<span class="hljs-comment">// 旋转显示</span>
<span class="hljs-keyword">void</span> (*fb_rotate)(<span class="hljs-keyword">struct</span> fb_info *info, <span class="hljs-keyword">int</span> angle);
<span class="hljs-comment">/* wait for blit idle, optional */</span>
<span class="hljs-comment">// 等待blit空闲，可选</span>
<span class="hljs-keyword">int</span> (*fb_sync)(<span class="hljs-keyword">struct</span> fb_info *info);
<span class="hljs-comment">/* perform fb specific ioctl (optional) */</span>
<span class="hljs-comment">// 运行fb指定的ioctl(可选)</span>
<span class="hljs-keyword">int</span> (*fb_ioctl)(<span class="hljs-keyword">struct</span> fb_info *info, unsigned <span class="hljs-keyword">int</span> cmd,
unsigned <span class="hljs-keyword">long</span> arg);
<span class="hljs-comment">/* Handle 32bit compat ioctl (optional) */</span>
<span class="hljs-comment">// 处理３２位兼容的ioctl</span>
<span class="hljs-keyword">int</span> (*fb_compat_ioctl)(<span class="hljs-keyword">struct</span> fb_info *info, unsigned cmd,
unsigned <span class="hljs-keyword">long</span> arg);
<span class="hljs-comment">/* perform fb specific mmap */</span>
<span class="hljs-comment">// 运行fb指定的mmap</span>
<span class="hljs-keyword">int</span> (*fb_mmap)(<span class="hljs-keyword">struct</span> fb_info *info, <span class="hljs-keyword">struct</span> vm_area_struct *vma);
<span class="hljs-comment">/* get capability given var */</span>
<span class="hljs-comment">// 获取给定的var的能力</span>
<span class="hljs-keyword">void</span> (*fb_get_caps)(<span class="hljs-keyword">struct</span> fb_info *info, <span class="hljs-keyword">struct</span> fb_blit_caps *caps,
<span class="hljs-keyword">struct</span> fb_var_screeninfo *<span class="hljs-keyword">var</span>);
<span class="hljs-comment">/* teardown any resources to do with this framebuffer */</span>
<span class="hljs-comment">// 卸载与该framebuffer相关的任何资源</span>
<span class="hljs-keyword">void</span> (*fb_destroy)(<span class="hljs-keyword">struct</span> fb_info *info);
};
#ifdef CONFIG_FB_TILEBLITTING
#define FB_TILE_CURSOR_NONE 0
#define FB_TILE_CURSOR_UNDERLINE 1
#define FB_TILE_CURSOR_LOWER_THIRD 2
#define FB_TILE_CURSOR_LOWER_HALF 3
#define FB_TILE_CURSOR_TWO_THIRDS 4
#define FB_TILE_CURSOR_BLOCK 5
struct fb_tilemap {
__u32 width; /* width of each tile in pixels 像素的宽度 */
__u32 height; /* height of each tile in scanlines 扫描行的高度 */
__u32 depth; /* color depth of each tile 颜色深度 */
__u32 length; /* number of tiles in the map 在映射中的数量 */
const __u8 data; / actual tile map: a bitmap array, packed
to the nearest byte 实际映射：一个位图数组，被打包到最近的位 */
};
struct fb_tilerect {
__u32 sx; /* origin in the x-axis 在x轴中原点*/
__u32 sy; /* origin in the y-axis 在y轴中的原点*/
__u32 width; /* number of tiles in the x-axis 在x-axis 中的数量 */
__u32 height; /* number of tiles in the y-axis 在y-axis中的数量 */
__u32 index; /* what tile to use: index to tile map 使用哪一个tile:到tile映射的索引 */
__u32 fg; /* foreground color 前景色 */
__u32 bg; /* background color 后景色 */
__u32 rop; /* raster operation 光栅操作 */
};
struct fb_tilearea {
__u32 sx; /* source origin in the x-axis 在X轴的源原点 */
__u32 sy; /* source origin in the y-axis 在y轴的源原点 */
__u32 dx; /* destination origin in the x-axis 在x轴的目的原点 */
__u32 dy; /* destination origin in the y-axis 在y轴的目的原点 */
__u32 width; /* number of tiles in the x-axis 在x轴中的tiles的数量 */
__u32 height; /* number of tiles in the y-axis 在y轴中的tiles的数量 */
};
struct fb_tileblit {
__u32 sx; /* origin in the x-axis 在x轴的原点 */
__u32 sy; /* origin in the y-axis 在y轴的原点*/
__u32 width; /* number of tiles in the x-axis 在x轴上的tiles的数量 */
__u32 height; /* number of tiles in the y-axis 在y轴上的tiles的数量 */
__u32 fg; /* foreground color 前景色*/
__u32 bg; /* background color 后景色*/
__u32 length; /* number of tiles to draw 要绘制的tiles的数量 */
__u32 indices; / array of indices to tile map 到tile映射的指数数组 */
};
struct fb_tilecursor {
__u32 sx; /* cursor position in the x-axis 在x轴的光标位置*/
__u32 sy; /* cursor position in the y-axis 在y轴的光标位置 */
__u32 mode; /* 0 = erase, 1 = draw 0 = 擦除，１＝绘制*/
__u32 shape; /* see FB_TILE_CURSOR_* 查看FB_TILE_CURSOR_* */
__u32 fg; /* foreground color 前景色*/
__u32 bg; /* background color 后景色*/
};
struct fb_tile_ops {
/* set tile characteristics 设置tile的特征*/
void (*fb_settile)(struct fb_info *info, struct fb_tilemap *map);
<span class="hljs-comment">/* all dimensions from hereon are in terms of tiles */</span>
<span class="hljs-comment">// 从现在起，所有尺寸都在tiles方面</span>
<span class="hljs-comment">/* move a rectangular region of tiles from one area to another*/</span>
<span class="hljs-comment">// 移动一个矩形区域从一个地方到另外一个地方</span>
<span class="hljs-keyword">void</span> (*fb_tilecopy)(<span class="hljs-keyword">struct</span> fb_info *info, <span class="hljs-keyword">struct</span> fb_tilearea *area);
<span class="hljs-comment">/* fill a rectangular region with a tile */</span>
<span class="hljs-comment">// 使用一个tile填充一个矩形区域</span>
<span class="hljs-keyword">void</span> (*fb_tilefill)(<span class="hljs-keyword">struct</span> fb_info *info, <span class="hljs-keyword">struct</span> fb_tilerect *rect);
<span class="hljs-comment">/* copy an array of tiles */</span>
<span class="hljs-comment">// 复制一个tile数组</span>
<span class="hljs-keyword">void</span> (*fb_tileblit)(<span class="hljs-keyword">struct</span> fb_info *info, <span class="hljs-keyword">struct</span> fb_tileblit *blit);
<span class="hljs-comment">/* cursor */</span>
<span class="hljs-comment">// 光标</span>
<span class="hljs-keyword">void</span> (*fb_tilecursor)(<span class="hljs-keyword">struct</span> fb_info *info,
<span class="hljs-keyword">struct</span> fb_tilecursor *cursor);
<span class="hljs-comment">/* get maximum length of the tile map */</span>
<span class="hljs-comment">// 获取tile映射的最大长度</span>
<span class="hljs-keyword">int</span> (*fb_get_tilemax)(<span class="hljs-keyword">struct</span> fb_info *info);
};
#endif /* CONFIG_FB_TILEBLITTING */
/* FBINFO_* = fb_info.flags bit flags FBINFO_* ＝ fb_info.flags 位标识 */
#define FBINFO_MODULE 0x0001 /* Low-level driver is a module 底层驱动是一个模块 */
#define FBINFO_HWACCEL_DISABLED 0x0002
/* When FBINFO_HWACCEL_DISABLED is set:
* Hardware acceleration is turned off. Software implementations
* of required functions (copyarea(), fillrect(), and imageblit())
* takes over; acceleration engine should be in a quiescent state */
/* 当FBINFO_HWACCEL_DISABLED被设置的时候：
* 硬件加速被关掉．所需功能的软件实现(copyarea(),fillrect()和imageblit())
* 接管．加速引擎应该位域静态状态
*
/* hints 提示*/
#define FBINFO_VIRTFB 0x0004 /* FB is System RAM, not device. FB是系统RAM，不是设备*/
#define FBINFO_PARTIAL_PAN_OK 0x0040 /* otw use pan only for double-buffering otw使用pan仅仅用于双缓冲 */
#define FBINFO_READS_FAST 0x0080 /* soft-copy faster than rendering 软拷贝快于渲染 */
/* hardware supported ops */
/* semantics: when a bit is set, it indicates that the operation is
* accelerated by hardware.
* 支持的硬件操作
* 语义：当一个位被设置，意味着操作被硬件加速了
*
* required functions will still work even if the bit is not set.
* 即使位没有被设置，所需的功能依旧工作．
* optional functions may not even exist if the flag bit is not set.
* 如果标识位没有被设置，可选的功能可能甚至不存在
*/
#define FBINFO_HWACCEL_NONE 0x0000
#define FBINFO_HWACCEL_COPYAREA 0x0100 /* required 需要*/
#define FBINFO_HWACCEL_FILLRECT 0x0200 /* required 需要*/
#define FBINFO_HWACCEL_IMAGEBLIT 0x0400 /* required 需要*/
#define FBINFO_HWACCEL_ROTATE 0x0800 /* optional 可选*/
#define FBINFO_HWACCEL_XPAN 0x1000 /* optional 可选*/
#define FBINFO_HWACCEL_YPAN 0x2000 /* optional */
#define FBINFO_HWACCEL_YWRAP 0x4000 /* optional */
#define FBINFO_MISC_USEREVENT 0x10000 /* event request
from userspace 从用户空间时间需要*/
#define FBINFO_MISC_TILEBLITTING 0x20000 /* use tile blitting 使用tile blitting*/
#define FBINFO_MISC_FIRMWARE 0x40000 /* a replaceable firmware
inited framebuffer 一个可替换的固件初始化的framebuffer*/
/* A driver may set this flag to indicate that it does want a set_par to be
* called every time when fbcon_switch is executed. The advantage is that with
* this flag set you can really be sure that set_par is always called before
* any of the functions dependant on the correct hardware state or altering
* that state, even if you are using some broken X releases. The disadvantage
* is that it introduces unwanted delays to every console switch if set_par
* is slow. It is a good idea to try this flag in the drivers initialization
* code whenever there is a bug report related to switching between X and the
* framebuffer console.
* 一个驱动可能会设置这个标识来表明每次当fbcon_switch被执行的时候，他不想调用set_par()．
* 他的优点就是伴随着这个标识的设置，你可以确定set_par在任何依赖于正确的硬件状态
* 或者是改变那个状态之前被一直调用，即使你整在使用一些x发行版．他的缺点就是如果
* set_par太慢的话，在显示在每一个控制台的时候，会导致不希望的延迟．
*
*
*/
#define FBINFO_MISC_ALWAYS_SETPAR 0x40000
/*
* Host and GPU endianness differ.
* 主机和GPU端不同
*/
#define FBINFO_FOREIGN_ENDIAN 0x100000
/*
* Big endian math. This is the same flags as above, but with different
* meaning, it is set by the fb subsystem depending FOREIGN_ENDIAN flag
* and host endianness. Drivers should not use this flag.
* 大端数学．这个是和上面一样的标识，但是意义却是不一样的，他是被依赖于FOREIGN_ENDIAN端
* 和主机端的fb子系统所设置的．驱动不应该使用这个标识
*
*/
#define FBINFO_BE_MATH 0x100000
struct fb_info {
int node;
int flags;
struct mutex lock; /* Lock for open/release/ioctl funcs 用于open/release/ioctl函数的锁 */
struct mutex mm_lock; /* Lock for fb_mmap and smem_* fields 用于fb_mmap和smem_* 域的锁 */
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 显示器标准 */
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 目前的颜色表 */
struct list_head modelist; /* mode list 模式列表 */
struct fb_videomode mode; / current mode 当前的video模式 */
#ifdef CONFIG_FB_BACKLIGHT
/* assigned backlight device 对应的背光设备*/
/* set before framebuffer registration,
remove after unregister 在framebuffer注册之前被设置，在注销之后移走 */
struct backlight_device *bl_dev;
<span class="hljs-comment">/* Backlight level curve 背光调整 */</span>
<span class="hljs-keyword">struct</span> mutex bl_curve_mutex;
u8 bl_curve[FB_BACKLIGHT_LEVELS];
#endif
#ifdef CONFIG_FB_DEFERRED_IO
struct delayed_work deferred_work;
struct fb_deferred_io *fbdefio;
#endif
<span class="hljs-keyword">struct</span> fb_ops *fbops; <span class="hljs-comment">// 帧缓冲操作</span>
<span class="hljs-keyword">struct</span> device *device; <span class="hljs-comment">/* This is the parent 辐射被*/</span>
<span class="hljs-keyword">struct</span> device *dev; <span class="hljs-comment">/* This is this fb device fb设备 */</span>
<span class="hljs-keyword">int</span> class_flag; <span class="hljs-comment">/* private sysfs flags 私有sysfs标识 */</span>
#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 ioremapped的虚拟内存大小 或者是 ０*/
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 硬件状态，如挂起 */
void fbcon_par; / fbcon use-only private area fbcon仅仅用于私有区域*/
/* From here on everything is device dependent 从这里开始所有的事物都是设备依赖的 */
void *par;
/* we need the PCI or similiar aperture base/size not
smem_start/size as smem_start may just be an object
allocated inside the aperture so may not actually overlap */
resource_size_t aperture_base;
resource_size_t aperture_size;
};
#ifdef MODULE
#define FBINFO_DEFAULT FBINFO_MODULE
#else
#define FBINFO_DEFAULT 0
#endif
// This will go away 这将会走开
#define FBINFO_FLAG_MODULE FBINFO_MODULE
#define FBINFO_FLAG_DEFAULT FBINFO_DEFAULT
/* This will go away
* fbset currently hacks in FB_ACCELF_TEXT into var.accel_flags
* when it wants to turn the acceleration engine on. This is
* really a separate operation, and should be modified via sysfs.
* But for now, we leave it broken with the following define
* 这将会走开．当他想要打开加速引擎的时候，fbset会到var.accel_falgs.
* 这个事实上是一个分离的操作，并且应该有sysfs修改．但是，对于现在来说，
* 我们把他打破与下面的定义．
*/
#define STUPID_ACCELF_TEXT_SHIT
// This will go away
// 这个将走开
#if defined(sparc)
/* We map all of our framebuffers such that big-endian accesses
* are what we want, so the following is sufficient.
*
* 我们映射所有的framebuffers，例如大端访问是我们需要的，所以下面的就足够了
*/
// This will go away
#define fb_readb sbus_readb
#define fb_readw sbus_readw
#define fb_readl sbus_readl
#define fb_readq sbus_readq
#define fb_writeb sbus_writeb
#define fb_writew sbus_writew
#define fb_writel sbus_writel
#define fb_writeq sbus_writeq
#define fb_memset sbus_memset_io
#elif defined(i386) || defined(alpha) || defined(x86_64) || defined(hppa) || defined(sh) || defined(powerpc) || defined(avr32) || defined(bfin)
#define fb_readb __raw_readb
#define fb_readw __raw_readw
#define fb_readl __raw_readl
#define fb_readq __raw_readq
#define fb_writeb __raw_writeb
#define fb_writew __raw_writew
#define fb_writel __raw_writel
#define fb_writeq __raw_writeq
#define fb_memset memset_io
#else
#define fb_readb(addr) ((volatile u8 ) (addr))
#define fb_readw(addr) ((volatile u16 ) (addr))
#define fb_readl(addr) ((volatile u32 ) (addr))
#define fb_readq(addr) ((volatile u64 ) (addr))
#define fb_writeb(b,addr) ((volatile u8 ) (addr) = (b))
#define fb_writew(b,addr) ((volatile u16 ) (addr) = (b))
#define fb_writel(b,addr) ((volatile u32 ) (addr) = (b))
#define fb_writeq(b,addr) ((volatile u64 ) (addr) = (b))
#define fb_memset memset
#endif
#define FB_LEFT_POS(p, bpp) (fb_be_math(p) ? (32 - (bpp)) : 0)
#define FB_SHIFT_HIGH(p, val, bits) (fb_be_math(p) ? (val) >> (bits) : \
(val) << (bits))
#define FB_SHIFT_LOW(p, val, bits) (fb_be_math(p) ? (val) << (bits) : \
(val) >> (bits))
<span class="hljs-comment">/*
* `Generic' versions of the frame buffer device operations
* framebuffer的'Generis'版本的设备操作
*
*/</span>
extern int fb_set_var(struct fb_info info, struct fb_var_screeninfo var);
extern int fb_pan_display(struct fb_info info, struct fb_var_screeninfo var);
extern int fb_blank(struct fb_info *info, int blank);
extern void cfb_fillrect(struct fb_info *info, const struct fb_fillrect *rect);
extern void cfb_copyarea(struct fb_info *info, const struct fb_copyarea *area);
extern void cfb_imageblit(struct fb_info *info, const struct fb_image *image);
/*
* Drawing operations where framebuffer is in system RAM
* 在framebuffer所在的系统RAM绘制操作
*
*/
extern void sys_fillrect(struct fb_info *info, const struct fb_fillrect *rect);
extern void sys_copyarea(struct fb_info *info, const struct fb_copyarea *area);
extern void sys_imageblit(struct fb_info *info, const struct fb_image *image);
extern ssize_t fb_sys_read(struct fb_info *info, char __user *buf,
size_t count, loff_t *ppos);
extern ssize_t fb_sys_write(struct fb_info *info, const char __user *buf,
size_t count, loff_t *ppos);
/* drivers/video/fbmem.c */
extern int register_framebuffer(struct fb_info *fb_info);
extern int unregister_framebuffer(struct fb_info *fb_info);
extern int fb_prepare_logo(struct fb_info *fb_info, int rotate);
extern int fb_show_logo(struct fb_info *fb_info, int rotate);
extern char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size);
extern void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx,
u32 height, u32 shift_high, u32 shift_low, u32 mod);
extern void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height);
extern void fb_set_suspend(struct fb_info *info, int state);
extern int fb_get_color_depth(struct fb_var_screeninfo *var,
struct fb_fix_screeninfo *fix);
extern int fb_get_options(char *name, char **option);
extern int fb_new_modelist(struct fb_info *info);
extern struct fb_info *registered_fb[FB_MAX];
extern int num_registered_fb;
extern struct class *fb_class;
extern int lock_fb_info(struct fb_info *info);
static inline void unlock_fb_info(struct fb_info *info)
{
mutex_unlock(&info->lock);
}
static inline void __fb_pad_aligned_buffer(u8 *dst, u32 d_pitch,
u8 *src, u32 s_pitch, u32 height)
{
int i, j;
d_pitch -= s_pitch;
<span class="hljs-keyword">for</span> (i = height; i--; ) {
<span class="hljs-comment">/* s_pitch is a few bytes at the most, memcpy is suboptimal */</span>
<span class="hljs-keyword">for</span> (j = <span class="hljs-number">0</span>; j < s_pitch; j++)
*dst++ = *src++;
dst += d_pitch;
}
}
/* drivers/video/fb_defio.c */
extern void fb_deferred_io_init(struct fb_info *info);
extern void fb_deferred_io_open(struct fb_info *info,
struct inode *inode,
struct file *file);
extern void fb_deferred_io_cleanup(struct fb_info *info);
extern int fb_deferred_io_fsync(struct file *file, struct dentry *dentry,
int datasync);
static inline bool fb_be_math(struct fb_info *info)
{
#ifdef CONFIG_FB_FOREIGN_ENDIAN
#if defined(CONFIG_FB_BOTH_ENDIAN)
return info->flags & FBINFO_BE_MATH;
#elif defined(CONFIG_FB_BIG_ENDIAN)
return true;
#elif defined(CONFIG_FB_LITTLE_ENDIAN)
return false;
#endif /* CONFIG_FB_BOTH_ENDIAN */
#else
#ifdef __BIG_ENDIAN
return true;
#else
return false;
#endif /* __BIG_ENDIAN */
#endif /* CONFIG_FB_FOREIGN_ENDIAN */
}
/* drivers/video/fbsysfs.c */
extern struct fb_info *framebuffer_alloc(size_t size, struct device *dev);
extern void framebuffer_release(struct fb_info *info);
extern int fb_init_device(struct fb_info *fb_info);
extern void fb_cleanup_device(struct fb_info *head);
extern void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max);
/* drivers/video/fbmon.c */
#define FB_MAXTIMINGS 0
#define FB_VSYNCTIMINGS 1
#define FB_HSYNCTIMINGS 2
#define FB_DCLKTIMINGS 3
#define FB_IGNOREMON 0x100
#define FB_MODE_IS_UNKNOWN 0
#define FB_MODE_IS_DETAILED 1
#define FB_MODE_IS_STANDARD 2
#define FB_MODE_IS_VESA 4
#define FB_MODE_IS_CALCULATED 8
#define FB_MODE_IS_FIRST 16
#define FB_MODE_IS_FROM_VAR 32
extern int fbmon_dpms(const struct fb_info *fb_info);
extern int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
struct fb_info *info);
extern int fb_validate_mode(const struct fb_var_screeninfo *var,
struct fb_info *info);
extern int fb_parse_edid(unsigned char edid, struct fb_var_screeninfo var);
extern const unsigned char *fb_firmware_edid(struct device *device);
extern void fb_edid_to_monspecs(unsigned char *edid,
struct fb_monspecs *specs);
extern void fb_destroy_modedb(struct fb_videomode *modedb);
extern int fb_find_mode_cvt(struct fb_videomode *mode, int margins, int rb);
extern unsigned char *fb_ddc_read(struct i2c_adapter *adapter);
/* drivers/video/modedb.c */
#define VESA_MODEDB_SIZE 34
extern void fb_var_to_videomode(struct fb_videomode *mode,
const struct fb_var_screeninfo *var);
extern void fb_videomode_to_var(struct fb_var_screeninfo *var,
const struct fb_videomode *mode);
extern int fb_mode_is_equal(const struct fb_videomode *mode1,
const struct fb_videomode *mode2);
extern int fb_add_videomode(const struct fb_videomode *mode,
struct list_head *head);
extern void fb_delete_videomode(const struct fb_videomode *mode,
struct list_head *head);
extern const struct fb_videomode fb_match_mode(const struct fb_var_screeninfo var,
struct list_head *head);
extern const struct fb_videomode fb_find_best_mode(const struct fb_var_screeninfo var,
struct list_head *head);
extern const struct fb_videomode *fb_find_nearest_mode(const struct fb_videomode *mode,
struct list_head *head);
extern void fb_destroy_modelist(struct list_head *head);
extern void fb_videomode_to_modelist(const struct fb_videomode *modedb, int num,
struct list_head *head);
extern const struct fb_videomode *fb_find_best_display(const struct fb_monspecs *specs,
struct list_head *head);
/* drivers/video/fbcmap.c */
extern int fb_alloc_cmap(struct fb_cmap *cmap, int len, int transp);
extern void fb_dealloc_cmap(struct fb_cmap *cmap);
extern int fb_copy_cmap(const struct fb_cmap *from, struct fb_cmap *to);
extern int fb_cmap_to_user(const struct fb_cmap *from, struct fb_cmap_user *to);
extern int fb_set_cmap(struct fb_cmap *cmap, struct fb_info *fb_info);
extern int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *fb_info);
extern const struct fb_cmap *fb_default_cmap(int len);
extern void fb_invert_cmaps(void);
struct fb_videomode {
const char name; / optional */
u32 refresh; /* optional */
u32 xres;
u32 yres;
u32 pixclock;
u32 left_margin;
u32 right_margin;
u32 upper_margin;
u32 lower_margin;
u32 hsync_len;
u32 vsync_len;
u32 sync;
u32 vmode;
u32 flag;
};
extern const char *fb_mode_option;
extern const struct fb_videomode vesa_modes[];
struct fb_modelist {
struct list_head list;
struct fb_videomode mode;
};
extern int fb_find_mode(struct fb_var_screeninfo *var,
struct fb_info *info, const char *mode_option,
const struct fb_videomode *db,
unsigned int dbsize,
const struct fb_videomode *default_mode,
unsigned int default_bpp);
#endif /* KERNEL */
#endif /* _LINUX_FB_H */