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283
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1 #if defined(__linux__)
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2 #include <unistd.h>
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3 #include <stdio.h>
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4 #include <fcntl.h>
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5 #include <linux/fb.h>
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6 #include <linux/fs.h>
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7 #include <sys/mman.h>
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8 #include <sys/ioctl.h>
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9 #include <stdlib.h>
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10 #include <iostream>
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11 using namespace std;
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12
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13 #define DEVICE_NAME "/dev/fb0"
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14 #define DIV_BYTE 8
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15
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16 /* function prototype */
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17 void send_current_error_msg(const char *ptr);
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18 void send_current_information(const char *ptr);
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19
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20 int get_fbdev_addr(void)
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21 {
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22 int fd_framebuffer ;
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23 struct fb_var_screeninfo vinfo;
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24 struct fb_fix_screeninfo finfo;
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25 long int screensize ;
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26 //long int location;
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27 char *fbptr ;
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28 char tmp[DIV_BYTE*10];
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29
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30 //int x , y ;
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31 int xres,yres,vbpp,line_len;
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32 //unsigned short tcolor ;
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33
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298
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34 /* 読み書き用にファイルを開く */
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283
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35 fd_framebuffer = open( DEVICE_NAME , O_RDWR);
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36 if ( !fd_framebuffer ) {
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37 send_current_error_msg("Framebuffer device open error !");
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38 exit(1);
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39 }
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40 send_current_information("The framebuffer device was opened !");
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41
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298
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42 /* 固定スクリーン情報取得 */
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283
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43 if ( ioctl( fd_framebuffer , FBIOGET_FSCREENINFO , &finfo ) ) {
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44 send_current_error_msg("Fixed information not gotton !");
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45 exit(2);
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46 }
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47
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298
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48 /* 変動スクリーン情報取得 */
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283
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49 if ( ioctl( fd_framebuffer , FBIOGET_VSCREENINFO , &vinfo ) ) {
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50 send_current_error_msg("Variable information not gotton !");
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51 exit(3);
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52 }
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53 xres = vinfo.xres ;
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54 yres = vinfo.yres ;
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55 vbpp = vinfo.bits_per_pixel ;
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56 line_len = finfo.line_length ;
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57 sprintf( tmp , "%d(pixel)x%d(line), %dbpp(bits per pixel)",xres,yres,vbpp);
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58 send_current_information( tmp );
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59
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298
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60 /* バイト単位でのスクリーンのサイズを計算 */
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283
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61 screensize = xres * yres * vbpp / DIV_BYTE ;
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62
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298
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63 /* デバイスをメモリにマップする */
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283
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64 fbptr = (char *)mmap(0,screensize,PROT_READ | PROT_WRITE,MAP_SHARED,fd_framebuffer,0);
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65 if ( (int)fbptr == -1 ) {
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66 send_current_error_msg("Don't get framebuffer device to memory !");
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67 exit(4);
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68 }
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69 send_current_information("The framebuffer device was mapped !");
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70
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71 printf("fb: 0x%x \n", (unsigned int)fbptr);
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72 return (int)fbptr;
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73 //munmap(fbptr,screensize);
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74 //close(fd_framebuffer);
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75 //return 0;
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76 }
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77
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78 void send_current_error_msg(const char *ptr)
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79 {
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80 fprintf( stderr , "%s\n" , ptr );
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81 }
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82
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83 void send_current_information(const char *ptr)
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84 {
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85 fprintf( stdout , "%s\n" , ptr );
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86 }
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87 #else /* !defined(__linux__) */
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88 int get_fbdev_addr(void) {return 0;}
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89 #endif /* defined(__linux__) */
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90
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91 extern int get_fbdev_addr(void);
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