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507
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1 #ifndef FB_H
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2 #define FB_H
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3
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283
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4 #if defined(__linux__)
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5
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283
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6 #include <unistd.h>
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7 #include <stdio.h>
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8 #include <fcntl.h>
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9 #include <linux/fb.h>
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10 #include <linux/fs.h>
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11 #include <sys/mman.h>
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12 #include <sys/ioctl.h>
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13 #include <stdlib.h>
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14 #include <iostream>
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15 using namespace std;
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16
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17 #define DEVICE_NAME "/dev/fb0"
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18 #define DIV_BYTE 8
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19
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20 /* function prototype */
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21 void send_current_error_msg(const char *ptr);
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22 void send_current_information(const char *ptr);
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23
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507
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24 /*
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25 Don't put real function in a header...
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26 */
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27
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283
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28 int get_fbdev_addr(void)
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29 {
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30 int fd_framebuffer ;
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31 struct fb_var_screeninfo vinfo;
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32 struct fb_fix_screeninfo finfo;
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33 long int screensize ;
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34 //long int location;
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35 char *fbptr ;
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36 char tmp[DIV_BYTE*10];
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37
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38 //int x , y ;
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39 int xres,yres,vbpp,line_len;
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40 //unsigned short tcolor ;
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41
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42 /* 読み書き用にファイルを開く */
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43 fd_framebuffer = open( DEVICE_NAME , O_RDWR);
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44 if ( !fd_framebuffer ) {
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45 send_current_error_msg("Framebuffer device open error !");
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46 exit(1);
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47 }
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48 send_current_information("The framebuffer device was opened !");
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49
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298
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50 /* 固定スクリーン情報取得 */
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51 if ( ioctl( fd_framebuffer , FBIOGET_FSCREENINFO , &finfo ) ) {
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52 send_current_error_msg("Fixed information not gotton !");
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53 exit(2);
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54 }
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55
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298
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56 /* 変動スクリーン情報取得 */
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57 if ( ioctl( fd_framebuffer , FBIOGET_VSCREENINFO , &vinfo ) ) {
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58 send_current_error_msg("Variable information not gotton !");
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59 exit(3);
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60 }
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61 xres = vinfo.xres ;
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62 yres = vinfo.yres ;
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63 vbpp = vinfo.bits_per_pixel ;
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64 line_len = finfo.line_length ;
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65 sprintf( tmp , "%d(pixel)x%d(line), %dbpp(bits per pixel)",xres,yres,vbpp);
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66 send_current_information( tmp );
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67
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298
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68 /* バイト単位でのスクリーンのサイズを計算 */
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69 screensize = xres * yres * vbpp / DIV_BYTE ;
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70
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298
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71 /* デバイスをメモリにマップする */
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72 fbptr = (char *)mmap(0,screensize,PROT_READ | PROT_WRITE,MAP_SHARED,fd_framebuffer,0);
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73 if ( (int)fbptr == -1 ) {
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74 send_current_error_msg("Don't get framebuffer device to memory !");
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75 exit(4);
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76 }
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77 send_current_information("The framebuffer device was mapped !");
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78
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79 printf("fb: 0x%x \n", (unsigned int)fbptr);
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80 return (int)fbptr;
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81 //munmap(fbptr,screensize);
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82 //close(fd_framebuffer);
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83 //return 0;
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84 }
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85
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86 void send_current_error_msg(const char *ptr)
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87 {
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88 fprintf( stderr , "%s\n" , ptr );
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89 }
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90
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91 void send_current_information(const char *ptr)
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92 {
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93 fprintf( stdout , "%s\n" , ptr );
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94 }
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95 #else /* !defined(__linux__) */
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96 int get_fbdev_addr(void) {return 0;}
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97 #endif /* defined(__linux__) */
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98
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99 extern int get_fbdev_addr(void);
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507
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100
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101 #endif
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