21行目の
    if ((ret = ftdi_usb_open(&ftdic, 0x0403, 0x6001)) < 0)
を
    if ((ret = ftdi_usb_open(&ftdic, 0x0403, 0x6010)) < 0)

28行目の
    if (ftdic.type == TYPE_R)
を
    if (ftdic.type == TYPE_2232C)

$ gcc ./simple2232d.c -lftdi -o ./simple2232d -O2

$ ./simple2232d
ftdi_read_chipid: 0
FTDI chipid: 5A0F082E

22行目の
    f = ftdi_usb_open(≈ftdic, 0x0403, 0x6001);
を
    f = ftdi_usb_open(&ftdic, 0x0403, 0x6010);

$ gcc ./bitbang2232d.c -lftdi -o ./bitbang2232d -O2

[hoge]$ ./bitbang2232d 
ftdi open succeeded: 0
enabling bitbang mode
turning everything on
turning everything off
fe fd fb f7 ef df bf 7f 
fe fd fb f7 ef df bf 7f 
fe fd fb f7 ef df bf 7f 
fe fd fb f7 ef df bf 7f 
disabling bitbang mode
[hoge]$ 

    int f, i, len;

    int pid = 0x6010;

        if ( f > 0 ){
          fprintf(stdout, "\n");
          break;
        }

    // Write data
    fprintf(stdout, "Please input string and return\n");
    scanf("%s",buf);
    len = strlen(buf);
    fprintf(stdout,"input str length=%d\n",len);
    if ((f = ftdi_write_data(&ftdic, buf, len+1)) < 0) {
        fprintf(stderr, "Error write. return val=[%d]\n", f);
        fflush(stderr);
        fflush(stdout);
    }
    else {
        fprintf(stdout, "write. return val=[%d]\n", f);
    }

$ gcc ./serial_lb2232d.c -lftdi -o ./serial_lb2232d -O2

[hogeuser]$ ./serial_lb2232d
Please input string and return
abc
input str length=3
write. return val=[4]    <-プログラム上'\0'分を追加してwriteしている
read 0 bytes
read 0 bytes
read 4 bytes
abc