aboutsummaryrefslogtreecommitdiff
path: root/src/z_lp.c
blob: 71421c06a032d94f3c8e8db83f842bf996b47140 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
 /* 
   (c) 2005:forum::für::umläute:2000

   write to the parallel port
   extended to write to any port (if we do have permissions)

*/
#ifndef MACOSX

#define BASE0  0x3bc
#define BASE1  0x378
#define BASE2  0x278

#define MODE_IOPERM 1
#define MODE_IOPL   0

#include "zexy.h"

#include <sys/io.h>
#include <stdlib.h>

/* ----------------------- lp --------------------- */

static int count_iopl = 0;

static t_class *lp_class;

typedef struct _lp
{
  t_object x_obj;

  unsigned long port;

  int mode; // MODE_IOPERM, MODE_IOPL
} t_lp;

static void lp_float(t_lp *x, t_floatarg f)
{
  if (x->port) {
    unsigned char b = f;
    outb(b, x->port);
  }
}

static void *lp_new(t_symbol *s, int argc, t_atom *argv)
{
  t_lp *x = (t_lp *)pd_new(lp_class);

  x->port = 0;
 
  if ((argc==0)||(argv->a_type==A_FLOAT)) {
    /* FLOAT specifies a parallel port */
    switch ((int)((argc)?atom_getfloat(argv):0)) {
    case 0:
      x->port = BASE0;
      break;
    case 1:
      x->port = BASE1;
      break;  
    case 2:
      x->port = BASE2;
      break;
    default:
      error("lp : only lp0, lp1 and lp2 are accessible");
      x->port = 0;
      return (x);
    }
  } else { 
    /* SYMBOL might be a file or a hex port-number;
       we ignore the file (device) case by now;
       LATER think about this
    */
    x->port=strtol(atom_getsymbol(argv)->s_name, 0, 16);
  }

  if (!x->port || x->port>65535){
    post("lp : bad port %x", x->port);
    x->port = 0;
    return (x);
  }

  if (x->port && x->port < 0x400){
    if (ioperm(x->port, 8, 1)) {
      error("lp : couldn't get write permissions");
      x->port = 0;
      return (x);
    }
    x->mode = MODE_IOPERM;
  } else {
    if (iopl(3)){
	error("lp : couldn't get write permissions");
	x->port = 0;
	return (x);
    }
    x->mode=MODE_IOPL;
    count_iopl++;
    post("iopl.............................%d", count_iopl);
  }
  
  post("connected to port %x in mode '%s'", x->port, (x->mode==MODE_IOPL)?"iopl":"ioperm");
  if (x->mode==MODE_IOPL)post("warning: this might seriously damage your pc...");
  
  return (x);
}

static void lp_free(t_lp *x)
{
  if (x->port) {
    if (x->mode==MODE_IOPERM && ioperm(x->port, 8, 0)) error("lp: couldn't clean up device");
    else if (x->mode==MODE_IOPL && (!--count_iopl) && iopl(0))
      error("lp: couldn't clean up device");
  }
}


static void helper(t_lp *x)
{
  post("\n%c lp :: direct access to the parallel port", HEARTSYMBOL);
  post("<byte>\t: write byte to the parallel-port");
  post("\ncreation:\t\"lp [<port>]\": connect to parallel port <port> (0..2)");
  post("\t\t\"lp <portaddr>\": connect to port @ <portaddr> (hex)");
}

void z_lp_setup(void)
{
  lp_class = class_new(gensym("lp"),
			  (t_newmethod)lp_new, (t_method)lp_free,
			  sizeof(t_lp), 0, A_GIMME, 0);

  class_addfloat(lp_class, (t_method)lp_float);

  class_addmethod(lp_class, (t_method)helper, gensym("help"), 0);
  class_sethelpsymbol(lp_class, gensym("zexy/lp"));
}

#endif /* MACOSX */