git.zerfleddert.de Git - usb-driver/blob - parport.c

   1 #include <stdio.h>
   2 #include <fcntl.h>
   3 #include <errno.h>
   4 #include <string.h>
   5 #include <unistd.h>
   6 #include <inttypes.h>
   7 #include <sys/types.h>
   8 #include <sys/ioctl.h>
   9 #include <linux/parport.h>
  10 #include <linux/ppdev.h>
  11 #include "usb-driver.h"
  12 #include "parport.h"
  13
  14 static int parportfd = -1;
  15
  16 int parport_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase, int ecpbase, int num) {
  17         int ret = 0;
  18         int i;
  19         unsigned long port;
  20         unsigned char val;
  21         static unsigned char last_pp_write = 0;
  22
  23         for (i = 0; i < num; i++) {
  24                 DPRINTF("dwPort: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
  25                                 (unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
  26                                 tr[i].fAutoinc, tr[i].dwOptions);
  27
  28                 port = (unsigned long)tr[i].dwPort;
  29                 val = tr[i].Data.Byte;
  30
  31 #ifdef DEBUG
  32                 if (tr[i].cmdTrans == 13)
  33                         DPRINTF("write byte: %d\n", val);
  34 #endif
  35
  36                 if (parportfd < 0)
  37                         return ret;
  38
  39                 if (port == ppbase + PP_DATA) {
  40                         DPRINTF("data port\n");
  41                         switch(tr[i].cmdTrans) {
  42                                 case PP_READ:
  43                                         ret = 0; /* We don't support reading of the data port */
  44                                         break;
  45
  46                                 case PP_WRITE:
  47                                         ret = ioctl(parportfd, PPWDATA, &val);
  48                                         last_pp_write = val;
  49                                         break;
  50
  51                                 default:
  52                                         fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
  53                                         ret = -1;
  54                                         break;
  55                         }
  56                 } else if (port == ppbase + PP_STATUS) {
  57                         DPRINTF("status port (last write: %d)\n", last_pp_write);
  58                         switch(tr[i].cmdTrans) {
  59                                 case PP_READ:
  60                                         ret = ioctl(parportfd, PPRSTATUS, &val);
  61 #ifdef FORCE_PC3_IDENT
  62                                         val &= 0x5f;
  63                                         if (last_pp_write & 0x40)
  64                                                 val |= 0x20;
  65                                         else
  66                                                 val |= 0x80;
  67 #endif
  68                                         break;
  69
  70                                 case PP_WRITE:
  71                                         ret = 0; /* Status Port is readonly */
  72                                         break;
  73
  74                                 default:
  75                                         fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
  76                                         ret = -1;
  77                                         break;
  78                         }
  79                 } else if (port == ppbase + PP_CONTROL) {
  80                         DPRINTF("control port\n");
  81                         switch(tr[i].cmdTrans) {
  82                                 case PP_READ:
  83                                         ret = ioctl(parportfd, PPRCONTROL, &val);
  84                                         break;
  85
  86                                 case PP_WRITE:
  87                                         ret = ioctl(parportfd, PPWCONTROL, &val);
  88                                         break;
  89
  90                                 default:
  91                                         fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
  92                                         ret = -1;
  93                                         break;
  94                         }
  95                 } else if ((port == ecpbase + PP_ECP_CFGA) && ecpbase) {
  96                         DPRINTF("ECP_CFGA port\n");
  97                 } else if ((port == ecpbase + PP_ECP_CFGB) && ecpbase) {
  98                         DPRINTF("ECP_CFGB port\n");
  99                 } else if ((port == ecpbase + PP_ECP_ECR) && ecpbase) {
 100                         DPRINTF("ECP_ECR port\n");
 101                 } else {
 102                         DPRINTF("access to unsupported address range!\n");
 103                         ret = 0;
 104                 }
 105
 106                 tr[i].Data.Byte = val;
 107
 108                 DPRINTF("dwPortReturn: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
 109                                 (unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
 110                                 tr[i].fAutoinc, tr[i].dwOptions);
 111 #ifdef DEBUG
 112                 if (tr[i].cmdTrans == 10)
 113                         DPRINTF("read byte: %d\n", tr[i].Data.Byte);
 114 #endif
 115         }
 116
 117         return ret;
 118 }
 119
 120 int parport_open(int num) {
 121         char ppdev[32];
 122
 123         if (parportfd < 0) {
 124                 snprintf(ppdev, sizeof(ppdev), "/dev/parport%u", num);
 125                 DPRINTF("opening %s\n", ppdev);
 126                 parportfd = open(ppdev, O_RDWR|O_EXCL);
 127
 128                 if (parportfd < 0)
 129                         fprintf(stderr,"Can't open %s: %s\n", ppdev, strerror(errno));
 130         }
 131
 132         if (parportfd >= 0) {
 133                 int pmode;
 134
 135                 if (ioctl(parportfd, PPCLAIM) == -1)
 136                         return -1;
 137
 138                 pmode = IEEE1284_MODE_COMPAT;
 139                 if (ioctl(parportfd, PPNEGOT, &pmode) == -1)
 140                         return -1;
 141
 142 #if 0
 143                 if (cr->Card.dwItems > 1 && cr->Card.Item[1].I.IO.dwAddr) {
 144                         DPRINTF("ECP mode requested\n");
 145                         ecpbase = (unsigned long)cr->Card.Item[1].I.IO.dwAddr;
 146                         /* TODO: Implement ECP mode */
 147                         pmode = IEEE1284_MODE_ECP;
 148
 149                         if (ioctl(parportfd, PPNEGOT, &pmode) == -1) {
 150                                 ecpbase = 0;
 151                                 pmode = IEEE1284_MODE_COMPAT;
 152                                 if (ioctl(parportfd, PPNEGOT, &pmode) == -1)
 153                                         return ret;
 154                         }
 155                 }
 156 #endif
 157         }
 158
 159         return parportfd;
 160 }
 161
 162 void parport_close(int handle) {
 163         if (parportfd == handle && parportfd >= 0) {
 164                 ioctl(parportfd, PPRELEASE);
 165                 close(parportfd);
 166                 parportfd = -1;
 167         }
 168 }