support/serial.c

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
   2
   3 /* serial port functions
   4  *
   5  * Author: Chris Toshok <toshok@ximian.com>
   6  */
   7
   8 #include <termios.h>
   9 #include <unistd.h>
  10 #include <fcntl.h>
  11 #include <string.h>
  12 #include <sys/poll.h>
  13 #include <sys/ioctl.h>
  14
  15 #include <glib.h>
  16
  17 /* This is for FIONREAD on solaris */
  18 #if defined(sun)
  19 #include <sys/filio.h>
  20 #endif
  21
  22 /* This is a copy of System.IO.Ports.Handshake */
  23 typedef enum {
  24         NoneHandshake = 0,
  25         XOnXOff = 1,
  26         RequestToSend = 2,
  27         RequestToSendXOnXOff = 3
  28 } MonoHandshake;
  29
  30 /* This is a copy of System.IO.Ports.Parity */
  31 typedef enum {
  32         NoneParity = 0,
  33         Odd = 1,
  34         Even = 2,
  35         Mark = 3,
  36         Space = 4
  37 } MonoParity;
  38
  39 /* This is a copy of System.IO.Ports.StopBits */
  40 typedef enum {
  41         NoneStopBits = 0,
  42         One = 1,
  43         Two = 2,
  44         OnePointFive = 3
  45 } MonoStopBits;
  46
  47 /* This is a copy of System.IO.Ports.SerialSignal */
  48 typedef enum {
  49         NoneSignal,
  50         Cd = 1, /* Carrier detect */
  51         Cts = 2, /* Clear to send */
  52         Dsr = 4, /* Data set ready */
  53         Dtr = 8, /* Data terminal ready */
  54         Rts = 16  /* Request to send */
  55 } MonoSerialSignal;
  56
  57 int
  58 open_serial (char* devfile)
  59 {
  60         int fd;
  61         struct termios newtio;
  62
  63         fd = open (devfile, O_RDWR);
  64
  65         if (fd == -1)
  66                 return -1;
  67
  68         newtio.c_cflag = CLOCAL | CREAD;
  69         newtio.c_iflag = 0;
  70         newtio.c_oflag = 0;
  71         newtio.c_lflag = 0;
  72
  73         tcflush(fd, TCIOFLUSH);
  74         tcsetattr(fd,TCSANOW,&newtio);
  75
  76         return fd;
  77 }
  78
  79 void
  80 close_serial (int unix_fd)
  81 {
  82         close (unix_fd);
  83 }
  84
  85 guint32
  86 read_serial (int fd, guchar *buffer, int offset, int count)
  87 {
  88         guint32 n;
  89
  90         n = read (fd, buffer + offset, count);
  91
  92         return (guint32) n;
  93 }
  94
  95 void
  96 write_serial (int fd, guchar *buffer, int offset, int count, int timeout)
  97 {
  98         guint32 n;
  99
 100         struct pollfd ufd;
 101
 102         ufd.fd = fd;
 103         ufd.events = POLLHUP | POLLOUT | POLLERR;
 104
 105         poll (&ufd, 1, timeout);
 106
 107         if ((ufd.revents & POLLOUT) != POLLOUT) {
 108                 return;
 109         }
 110
 111         n = write (fd, buffer + offset, count);
 112 }
 113
 114 void
 115 discard_buffer (int fd, gboolean input)
 116 {
 117         tcflush(fd, input ? TCIFLUSH : TCOFLUSH);
 118 }
 119
 120 gint32
 121 get_bytes_in_buffer (int fd, gboolean input)
 122 {
 123         gint32 retval;
 124
 125         if (ioctl (fd, input ? FIONREAD : TIOCOUTQ, &retval) == -1) {
 126                 return -1;
 127         }
 128
 129         return retval;
 130 }
 131
 132 gboolean
 133 set_attributes (int fd, int baud_rate, MonoParity parity, int dataBits, MonoStopBits stopBits, MonoHandshake handshake)
 134 {
 135         struct termios newtio;
 136
 137         tcgetattr (fd, &newtio);
 138
 139         switch (baud_rate) {
 140         case 230400: baud_rate = B230400; break;
 141         case 115200: baud_rate = B115200; break;
 142         case 57600: baud_rate = B57600; break;
 143         case 38400: baud_rate = B38400; break;
 144         case 19200: baud_rate = B19200; break;
 145         case 9600: baud_rate = B9600; break;
 146         case 4800: baud_rate = B4800; break;
 147         case 2400: baud_rate = B2400; break;
 148         case 1800: baud_rate = B1800; break;
 149         case 1200: baud_rate = B1200; break;
 150         case 600: baud_rate = B600; break;
 151         case 300: baud_rate = B300; break;
 152         case 200: baud_rate = B200; break;
 153         case 150: baud_rate = B150; break;
 154         case 134: baud_rate = B134; break;
 155         case 110: baud_rate = B110; break;
 156         case 75: baud_rate = B75; break;
 157         case 50:
 158         case 0:
 159         default:
 160                 baud_rate = B9600;
 161                 break;
 162         }
 163
 164         switch (parity) {
 165         case NoneParity: /* None */
 166                 newtio.c_iflag |= IGNPAR;
 167                 newtio.c_cflag &= ~(PARENB | PARODD);
 168                 break;
 169         case Odd: /* Odd */
 170                 newtio.c_iflag &= ~IGNPAR;
 171                 newtio.c_cflag |= PARENB | PARODD;
 172                 break;
 173         case Even: /* Even */
 174                 newtio.c_iflag &= ~(IGNPAR | PARODD);
 175                 newtio.c_cflag |= PARENB;
 176                 break;
 177         case Mark: /* Mark */
 178                 /* XXX unhandled */
 179                 break;
 180         case Space: /* Space */
 181                 /* XXX unhandled */
 182                 break;
 183         }
 184
 185         newtio.c_cflag &= ~CSIZE;
 186         switch (dataBits) {
 187         case 5: newtio.c_cflag |= CS5; break;
 188         case 6: newtio.c_cflag |= CS6; break;
 189         case 7: newtio.c_cflag |= CS7; break;
 190         case 8:
 191         default:
 192                 newtio.c_cflag |= CS8;
 193                 break;
 194         }
 195
 196         newtio.c_cflag &= ~CSTOPB;
 197         switch (stopBits) {
 198         case NoneStopBits:
 199                 /* Unhandled */
 200                 break;
 201         case One: /* One */
 202                 /* do nothing, the default is one stop bit */
 203                 break;
 204         case Two: /* Two */
 205                 newtio.c_cflag |= CSTOPB;
 206                 break;
 207         case OnePointFive: /* OnePointFive */
 208                 /* XXX unhandled */
 209                 break;
 210         }
 211
 212         newtio.c_iflag &= ~IXOFF;
 213         newtio.c_oflag &= ~IXON;
 214 #ifdef CRTSCTS
 215         newtio.c_cflag &= ~CRTSCTS;
 216 #endif /* def CRTSCTS */
 217         switch (handshake) {
 218         case NoneHandshake: /* None */
 219                 /* do nothing */
 220                 break;
 221         case RequestToSend: /* RequestToSend (RTS) */
 222 #ifdef CRTSCTS
 223                 newtio.c_cflag |= CRTSCTS;
 224 #endif /* def CRTSCTS */
 225                 break;
 226         case RequestToSendXOnXOff: /* RequestToSendXOnXOff (RTS + XON/XOFF) */
 227 #ifdef CRTSCTS
 228                 newtio.c_cflag |= CRTSCTS;
 229 #endif /* def CRTSCTS */
 230                 /* fall through */
 231         case XOnXOff: /* XOnXOff */
 232                 newtio.c_iflag |= IXOFF;
 233                 //              newtio.c_oflag |= IXON;
 234                 break;
 235         }
 236
 237         if (cfsetospeed (&newtio, baud_rate) < 0 || cfsetispeed (&newtio, baud_rate) < 0 ||
 238                         tcsetattr (fd, TCSADRAIN, &newtio) < 0)
 239                 return FALSE;
 240
 241         return TRUE;
 242 }
 243
 244 static gint32
 245 get_signal_code (MonoSerialSignal signal)
 246 {
 247         switch (signal) {
 248                 case Cd:
 249                         return TIOCM_CAR;
 250                 case Cts:
 251                         return TIOCM_CTS;
 252                 case Dsr:
 253                         return TIOCM_DSR;
 254                 case Dtr:
 255                         return TIOCM_DTR;
 256                 case Rts:
 257                         return TIOCM_RTS;
 258                 default:
 259                         return 0;
 260         }
 261
 262         /* Not reached */
 263         return 0;
 264 }
 265
 266 static MonoSerialSignal
 267 get_mono_signal_codes (int signals)
 268 {
 269         MonoSerialSignal retval = NoneSignal;
 270
 271         if ((signals & TIOCM_CAR) != 0)
 272                 retval |= Cd;
 273         if ((signals & TIOCM_CTS) != 0)
 274                 retval |= Cts;
 275         if ((signals & TIOCM_DSR) != 0)
 276                 retval |= Dsr;
 277         if ((signals & TIOCM_DTR) != 0)
 278                 retval |= Dtr;
 279         if ((signals & TIOCM_RTS) != 0)
 280                 retval |= Rts;
 281
 282         return retval;
 283 }
 284
 285 MonoSerialSignal
 286 get_signals (int fd, gint32 *error)
 287 {
 288         int signals;
 289
 290         *error = 0;
 291
 292         if (ioctl (fd, TIOCMGET, &signals) == -1) {
 293                 *error = -1;
 294                 return NoneSignal;
 295         }
 296
 297         return get_mono_signal_codes (signals);
 298 }
 299
 300 gint32
 301 set_signal (int fd, MonoSerialSignal signal, gboolean value)
 302 {
 303         int signals, expected, activated;
 304
 305         expected = get_signal_code (signal);
 306         if (ioctl (fd, TIOCMGET, &signals) == -1)
 307                 return -1;
 308
 309         activated = (signals & expected) != 0;
 310         if (activated == value) /* Already set */
 311                 return 1;
 312
 313         if (value)
 314                 signals |= expected;
 315         else
 316                 signals &= ~expected;
 317
 318         if (ioctl (fd, TIOCMSET, &signals) == -1)
 319                 return -1;
 320
 321         return 1;
 322 }
 323
 324 gboolean
 325 poll_serial (int fd, gint32 *error)
 326 {
 327         struct pollfd pinfo;
 328
 329         *error = 0;
 330
 331         pinfo.fd = fd;
 332         pinfo.events = POLLIN;
 333         pinfo.revents = 0;
 334
 335         if (poll (&pinfo, 1, 0) == -1) {
 336                 *error = -1;
 337                 return FALSE;
 338         }
 339
 340         return (pinfo.revents & POLLIN) != 0 ? 1 : 0;
 341 }
 342
 343 /*
 344  * mono internals should not be used here.
 345  * this serial stuff needs to be implemented with icalls.
 346  * make this at least compile until the code is moved elsewhere
 347  * defined(linux) is wrong, too
 348  */
 349 void*
 350 list_serial_devices (void)
 351 {
 352         return NULL;
 353 }
 354
 355 #if 0
 356 MonoArray *
 357 list_serial_devices (void)
 358 {
 359         MonoArray *array;
 360 #if defined(linux)
 361         /* Linux serial files are of the form ttyS[0-9]+ */
 362         GSList *l, *list = NULL;
 363         GDir* dir = g_dir_open ("/dev", 0, NULL);
 364         const char *filename;
 365         int i = 0;
 366
 367         while ((filename = g_dir_read_name (dir))) {
 368                 if (filename) {
 369                         if (!strncmp (filename, "ttyS", 4))
 370                                 list = g_slist_append (list, g_strconcat ("/dev/", filename, NULL));
 371                 }
 372         }
 373
 374         g_dir_close (dir);
 375
 376         array = mono_array_new (mono_domain_get (), mono_get_string_class (), g_slist_length (list));
 377         for (l = list; l; l = l->next) {
 378                 mono_array_set (array, gpointer, i++, mono_string_new (mono_domain_get (), (char*)l->data));
 379                 g_free (l->data);
 380         }
 381
 382         g_slist_free (list);
 383
 384 #else
 385 #warning "list_serial_devices isn't ported to this OS"
 386 #endif
 387
 388         return array;
 389 }
 390 #endif
 391