Cerium: fb.h Source File

00001 #if defined(__linux__)
00002 #include <unistd.h>
00003 #include <stdio.h>
00004 #include <fcntl.h>
00005 #include <linux/fb.h>
00006 #include <linux/fs.h>
00007 #include <sys/mman.h>
00008 #include <sys/ioctl.h>
00009 #include <stdlib.h>
00010 #include <iostream>
00011 using namespace std;
00012 
00013 #define DEVICE_NAME "/dev/fb0"
00014 #define DIV_BYTE 8
00015 
00016 /* function prototype */
00017 void send_current_error_msg(const char *ptr);
00018 void send_current_information(const char *ptr);
00019 
00020 int get_fbdev_addr(void)
00021 {
00022         int fd_framebuffer ;
00023         struct fb_var_screeninfo vinfo;
00024         struct fb_fix_screeninfo finfo;
00025         long int screensize ;
00026         //long int location;
00027         char *fbptr ;
00028         char tmp[DIV_BYTE*10];
00029 
00030         //int x , y ;
00031         int xres,yres,vbpp,line_len;
00032         //unsigned short tcolor ;
00033 
00034         /* 読み書き用にファイルを開く */
00035         fd_framebuffer = open( DEVICE_NAME , O_RDWR);
00036         if ( !fd_framebuffer ) {
00037             send_current_error_msg("Framebuffer device open error !");
00038             exit(1);
00039         }
00040         send_current_information("The framebuffer device was opened !");
00041         
00042         /* 固定スクリーン情報取得 */
00043         if ( ioctl( fd_framebuffer , FBIOGET_FSCREENINFO , &finfo ) ) {
00044             send_current_error_msg("Fixed information not gotton !");
00045             exit(2);
00046         }
00047 
00048         /* 変動スクリーン情報取得 */
00049         if ( ioctl( fd_framebuffer , FBIOGET_VSCREENINFO , &vinfo ) ) {
00050                 send_current_error_msg("Variable information not gotton !");
00051                 exit(3);
00052         }
00053         xres = vinfo.xres ;
00054         yres = vinfo.yres ;
00055         vbpp = vinfo.bits_per_pixel ;
00056         line_len = finfo.line_length ;
00057         sprintf( tmp , "%d(pixel)x%d(line), %dbpp(bits per pixel)",xres,yres,vbpp);
00058         send_current_information( tmp );
00059 
00060         /* バイト単位でのスクリーンのサイズを計算 */
00061         screensize = xres * yres * vbpp / DIV_BYTE ;
00062 
00063         /* デバイスをメモリにマップする */
00064         fbptr = (char *)mmap(0,screensize,PROT_READ | PROT_WRITE,MAP_SHARED,fd_framebuffer,0);
00065         if ( (int)fbptr == -1 ) {
00066                 send_current_error_msg("Don't get framebuffer device to memory !");
00067                 exit(4);
00068         }
00069         send_current_information("The framebuffer device was mapped !");
00070 
00071         printf("fb: 0x%x \n", (unsigned int)fbptr);
00072         return (int)fbptr;
00073         //munmap(fbptr,screensize);
00074         //close(fd_framebuffer);
00075         //return 0;
00076 }
00077 
00078 void send_current_error_msg(const char *ptr)
00079 {
00080     fprintf( stderr , "%s\n" , ptr );
00081 }
00082 
00083 void send_current_information(const char *ptr)
00084 {
00085     fprintf( stdout , "%s\n" , ptr );
00086 }
00087 #else /* !defined(__linux__) */
00088 int get_fbdev_addr(void) {return 0;}
00089 #endif /* defined(__linux__) */
00090 
00091 extern int get_fbdev_addr(void);