include/linux/fb.h中的一些重要的数据结构
struct fb_fix_screeninfo {
char id[16]; /* identification string eg "TT Builtin" */
unsigned long smem_start; /* Start of frame buffer mem */
/* (physical address) */
__u32 smem_len; /* Length of frame buffer mem */
__u32 type; /* see FB_TYPE_* */
__u32 type_aux; /* Interleave for interleaved Planes */
__u32 visual; /* see FB_VISUAL_* */
__u16 xpanstep; /* zero if no hardware panning */
__u16 ypanstep; /* zero if no hardware panning */
__u16 ywrapstep; /* zero if no hardware ywrap */
__u32 line_length; /* length of a line in bytes */
unsigned long mmio_start; /* Start of Memory Mapped I/O */
/* (physical address) */
__u32 mmio_len; /* Length of Memory Mapped I/O */
__u32 accel; /* Type of acceleration available */
__u16 reserved[3]; /* Reserved for future compatibility */
};
struct fb_bitfield {
__u32 offset; /* beginning of bitfield */
__u32 length; /* length of bitfield */
__u32 msb_right; /* != 0 : Most significant bit is */
/* right */
};
struct fb_info {
char modename[40]; /* default video mode */
kdev_t node;
int flags;
int open; /* Has this been open already ? */
#define FBINFO_FLAG_MODULE 1 /* Low-level driver is a module */
struct fb_var_screeninfo var; /* Current var */
struct fb_fix_screeninfo fix; /* Current fix */
struct fb_monspecs monspecs; /* Current Monitor specs */
struct fb_cmap cmap; /* Current cmap */
struct fb_ops *fbops;
char *screen_base; /* Virtual address */
struct display *disp; /* initial display variable */
struct vc_data *display_fg; /* Console visible on this display */
char fontname[40]; /* default font name */
devfs_handle_t devfs_handle; /* Devfs handle for new name */
devfs_handle_t devfs_lhandle; /* Devfs handle for compat. symlink */
int (*changevar)(int); /* tell console var has changed */
int (*switch_con)(int, struct fb_info*);
/* tell fb to switch consoles */
int (*updatevar)(int, struct fb_info*);
/* tell fb to update the vars */
void (*blank)(int, struct fb_info*); /* tell fb to (un)blank the screen */
/* arg = 0: unblank */
/* arg > 0: VESA level (arg-1) */
void *pseudo_palette; /* Fake palette of 16 colors and
the cursor's color for non
palette mode */
/* From here on everything is device dependent */
void *par;
};
struct fbgen_hwswitch {
void (*detect)(void);
int (*encode_fix)(struct fb_fix_screeninfo *fix, const void *par,
struct fb_info_gen *info);
int (*decode_var)(const struct fb_var_screeninfo *var, void *par,
struct fb_info_gen *info);
int (*encode_var)(struct fb_var_screeninfo *var, const void *par,
struct fb_info_gen *info);
void (*get_par)(void *par, struct fb_info_gen *info);
void (*set_par)(const void *par, struct fb_info_gen *info);
int (*getcolreg)(unsigned regno, unsigned *red, unsigned *green,
unsigned *blue, unsigned *transp, struct fb_info *info);
int (*setcolreg)(unsigned regno, unsigned red, unsigned green,
unsigned blue, unsigned transp, struct fb_info *info);
int (*pan_display)(const struct fb_var_screeninfo *var,
struct fb_info_gen *info);
int (*blank)(int blank_mode, struct fb_info_gen *info);
void (*set_disp)(const void *par, struct display *disp,
struct fb_info_gen *info);
};
struct fb_info_gen {
struct fb_info info;
/* Entries for a generic frame buffer device */
/* Yes, this starts looking like C++ */
u_int parsize;
struct fbgen_hwswitch *fbhw;
/* From here on everything is device dependent */
};