fbutil.c

   1 /*
   2  * fbutil.c -- get/set framebuffer values
   3  *
   4  * hackbard@hackdaworld.dyndns.org
   5  *
   6  */
   7
   8 #include <stdio.h>
   9 #include <sys/types.h>
  10 #include <sys/stat.h>
  11 #include <sys/ioctl.h>
  12 #include <fcntl.h>
  13 #include <unistd.h>
  14 #include <string.h>
  15
  16 #include <linux/fb.h>
  17
  18 #define MAXDEV 32
  19 #define DEVICE "/dev/fb/0"
  20
  21 #define FIXED_INFO (1<<0)
  22 #define VAR_INFO (1<<1)
  23
  24 int usage() {
  25         printf("usage:\n");
  26         printf("-d \t specify device (default %s)\n",DEVICE);
  27         printf("-f \t print out fixed framebuffer info\n");
  28         printf("-v \t print out variable framebuffer info\n");
  29         printf("\n");
  30         return 1;
  31 }
  32
  33 int main(int argc,char **argv) {
  34
  35         int i;
  36         int fd;
  37         char device[MAXDEV];
  38         unsigned char getmodes;
  39         unsigned char setmodes;
  40
  41         /* fb variables */
  42         struct fb_fix_screeninfo fixed_info;
  43         struct fb_var_screeninfo var_info;
  44
  45         strcpy(device,DEVICE);
  46         getmodes=0;
  47         setmodes=0;
  48
  49         for(i=1;i<argc;i++) {
  50                 if(argv[i][0]=='-') {
  51                         switch(argv[i][1]) {
  52                                 case 'd':
  53                                         strncpy(device,argv[++i],MAXDEV-1);
  54                                         break;
  55                                 case 'f':
  56                                         getmodes|=FIXED_INFO;
  57                                         break;
  58                                 case 'v':
  59                                         getmodes|=VAR_INFO;
  60                                         break;
  61                                 default:
  62                                         usage();
  63                                         return -1;
  64                         }
  65                 }
  66                 else {
  67                         usage();
  68                         return -1;
  69                 }
  70         }
  71
  72         if((fd=open(device,O_RDWR))<0) {
  73                 printf("unable to open %s\n",device);
  74                 return -1;
  75         }
  76
  77         if(getmodes&FIXED_INFO) {
  78                 if(ioctl(fd,FBIOGET_FSCREENINFO,&fixed_info)<0) {
  79                         printf("cannot get fixed screen info\n");
  80                         return -1;
  81                 }
  82                 printf("fixed screen info:\n");
  83                 printf("id: %s\n",fixed_info.id);
  84                 printf("framebuffer memory: start=0x%x length=%u\n",
  85                         fixed_info.smem_start,fixed_info.smem_len);
  86                 printf("type: ");
  87                 if(fixed_info.type==FB_TYPE_PACKED_PIXELS)
  88                         printf("packed pixels\n");
  89                 if(fixed_info.type==FB_TYPE_PLANES)
  90                         printf("non interleaved planes\n");
  91                 if(fixed_info.type==FB_TYPE_INTERLEAVED_PLANES)
  92                         printf("interleaved planes\n");
  93                 if(fixed_info.type==FB_TYPE_TEXT)
  94                         printf("text attributes\n");
  95                 if(fixed_info.type==FB_TYPE_VGA_PLANES)
  96                         printf("ega/vga planes\n");
  97                 printf("visual: ");
  98                 if(fixed_info.visual==FB_VISUAL_MONO01)
  99                         printf("monochrome 1=black, 0=white\n");
 100                 if(fixed_info.visual==FB_VISUAL_MONO10)
 101                         printf("monochrome 1=white, 0=black\n");
 102                 if(fixed_info.visual==FB_VISUAL_TRUECOLOR)
 103                         printf("true color\n");
 104                 if(fixed_info.visual==FB_VISUAL_PSEUDOCOLOR)
 105                         printf("pseudo color\n");
 106                 if(fixed_info.visual==FB_VISUAL_DIRECTCOLOR)
 107                         printf("direct color\n");
 108                 if(fixed_info.visual==FB_VISUAL_STATIC_PSEUDOCOLOR)
 109                         printf("direct pseudo color\n");
 110                 printf("hardware panning x/y: %c/%c\n",
 111                         fixed_info.xpanstep?'y':'n',
 112                         fixed_info.ypanstep?'y':'n');
 113                 printf("hardware y wrap: %c\n",fixed_info.ywrapstep?'y':'n');
 114                 printf("line length: %u bytes\n",fixed_info.line_length);
 115                 printf("mapped memory: start=0x%0x length=%u\n",
 116                         fixed_info.mmio_start,fixed_info.mmio_len);
 117                 printf("accel: %u (0 = no accel, > 0 see <linux/fb.h>)\n",
 118                         fixed_info.accel);
 119
 120         }
 121
 122         if(getmodes&VAR_INFO) {
 123                 if(ioctl(fd,FBIOGET_VSCREENINFO,&var_info)<0) {
 124                         printf("cannot get variable screen info\n");
 125                         return -1;
 126                 }
 127                 printf("variable screen info:\n");
 128                 printf("resolution: %ux%u, virtual %ux%u\n",
 129                         var_info.xres,var_info.yres,
 130                         var_info.xres_virtual,var_info.yres_virtual);
 131                 printf("bits per pixel: %u\n",var_info.bits_per_pixel);
 132                 printf("offsets: x=%u y=%u\n",
 133                         var_info.xoffset,var_info.yoffset);
 134                 printf("gray scale: %c\n",var_info.grayscale?'y':'n');
 135                 printf("rgb:\n");
 136                 printf("red: offset=%u length=%u msb=%c\n",
 137                         var_info.red.offset,var_info.red.length,
 138                         var_info.red.msb_right?'r':'l');
 139                 printf("green: offset=%u length=%u msb=%c\n",
 140                         var_info.green.offset,var_info.green.length,
 141                         var_info.green.msb_right?'r':'l');
 142                 printf("blue: offset=%u length=%u msb=%c\n",
 143                         var_info.blue.offset,var_info.blue.length,
 144                         var_info.blue.msb_right?'r':'l');
 145                 printf("transparency: offset=%u length=%u msb=%c\n",
 146                         var_info.transp.offset,var_info.transp.length,
 147                         var_info.transp.msb_right?'r':'l');
 148                 printf("non standard pixel format: %c\n",
 149                         var_info.nonstd?'y':'n');
 150                 // printf("activate:
 151         }
 152
 153         close(fd);
 154
 155         return 1;
 156 }
 157