net/irda/ircomm/ircomm_tty_ioctl.c

   1 /*********************************************************************
   2  *
   3  * Filename:      ircomm_tty_ioctl.c
   4  * Version:
   5  * Description:
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Thu Jun 10 14:39:09 1999
   9  * Modified at:   Wed Jan  5 14:45:43 2000
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  *
  12  *     Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
  13  *
  14  *     This program is free software; you can redistribute it and/or
  15  *     modify it under the terms of the GNU General Public License as
  16  *     published by the Free Software Foundation; either version 2 of
  17  *     the License, or (at your option) any later version.
  18  *
  19  *     This program is distributed in the hope that it will be useful,
  20  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  22  *     GNU General Public License for more details.
  23  *
  24  *     You should have received a copy of the GNU General Public License
  25  *     along with this program; if not, write to the Free Software
  26  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  27  *     MA 02111-1307 USA
  28  *
  29  ********************************************************************/
  30
  31 #include <linux/init.h>
  32 #include <linux/fs.h>
  33 #include <linux/sched.h>
  34 #include <linux/termios.h>
  35 #include <linux/tty.h>
  36 #include <linux/serial.h>
  37
  38 #include <asm/segment.h>
  39 #include <asm/uaccess.h>
  40
  41 #include <net/irda/irda.h>
  42 #include <net/irda/irmod.h>
  43
  44 #include <net/irda/ircomm_core.h>
  45 #include <net/irda/ircomm_param.h>
  46 #include <net/irda/ircomm_tty_attach.h>
  47 #include <net/irda/ircomm_tty.h>
  48
  49 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
  50
  51 /*
  52  * Function ircomm_tty_change_speed (driver)
  53  *
  54  *    Change speed of the driver. If the remote device is a DCE, then this
  55  *    should make it change the speed of its serial port
  56  */
  57 void ircomm_tty_change_speed(struct ircomm_tty_cb *self)
  58 {
  59         unsigned cflag, cval;
  60         int baud;
  61
  62         IRDA_DEBUG(2, __FUNCTION__ "()\n");
  63
  64         if (!self->tty || !self->tty->termios || !self->ircomm)
  65                 return;
  66
  67         cflag = self->tty->termios->c_cflag;
  68
  69         /*  byte size and parity */
  70         switch (cflag & CSIZE) {
  71         case CS5: cval = IRCOMM_WSIZE_5; break;
  72         case CS6: cval = IRCOMM_WSIZE_6; break;
  73         case CS7: cval = IRCOMM_WSIZE_7; break;
  74         case CS8: cval = IRCOMM_WSIZE_8; break;
  75         default:  cval = IRCOMM_WSIZE_5; break;
  76         }
  77         if (cflag & CSTOPB)
  78                 cval |= IRCOMM_2_STOP_BIT;
  79
  80         if (cflag & PARENB)
  81                 cval |= IRCOMM_PARITY_ENABLE;
  82         if (!(cflag & PARODD))
  83                 cval |= IRCOMM_PARITY_EVEN;
  84
  85         /* Determine divisor based on baud rate */
  86         baud = tty_get_baud_rate(self->tty);
  87         if (!baud)
  88                 baud = 9600;    /* B0 transition handled in rs_set_termios */
  89
  90         self->settings.data_rate = baud;
  91         ircomm_param_request(self, IRCOMM_DATA_RATE, FALSE);
  92
  93         /* CTS flow control flag and modem status interrupts */
  94         if (cflag & CRTSCTS) {
  95                 self->flags |= ASYNC_CTS_FLOW;
  96                 self->settings.flow_control |= IRCOMM_RTS_CTS_IN;
  97         } else {
  98                 self->flags &= ~ASYNC_CTS_FLOW;
  99                 self->settings.flow_control &= ~IRCOMM_RTS_CTS_IN;
 100         }
 101         if (cflag & CLOCAL)
 102                 self->flags &= ~ASYNC_CHECK_CD;
 103         else
 104                 self->flags |= ASYNC_CHECK_CD;
 105 #if 0
 106         /*
 107          * Set up parity check flag
 108          */
 109
 110         if (I_INPCK(self->tty))
 111                 driver->read_status_mask |= LSR_FE | LSR_PE;
 112         if (I_BRKINT(driver->tty) || I_PARMRK(driver->tty))
 113                 driver->read_status_mask |= LSR_BI;
 114
 115         /*
 116          * Characters to ignore
 117          */
 118         driver->ignore_status_mask = 0;
 119         if (I_IGNPAR(driver->tty))
 120                 driver->ignore_status_mask |= LSR_PE | LSR_FE;
 121
 122         if (I_IGNBRK(self->tty)) {
 123                 self->ignore_status_mask |= LSR_BI;
 124                 /*
 125                  * If we're ignore parity and break indicators, ignore
 126                  * overruns too. (For real raw support).
 127                  */
 128                 if (I_IGNPAR(self->tty))
 129                         self->ignore_status_mask |= LSR_OE;
 130         }
 131 #endif
 132         self->settings.data_format = cval;
 133
 134         ircomm_param_request(self, IRCOMM_DATA_FORMAT, FALSE);
 135         ircomm_param_request(self, IRCOMM_FLOW_CONTROL, TRUE);
 136 }
 137
 138 /*
 139  * Function ircomm_tty_set_termios (tty, old_termios)
 140  *
 141  *    This routine allows the tty driver to be notified when device's
 142  *    termios settings have changed.  Note that a well-designed tty driver
 143  *    should be prepared to accept the case where old == NULL, and try to
 144  *    do something rational.
 145  */
 146 void ircomm_tty_set_termios(struct tty_struct *tty,
 147                             struct termios *old_termios)
 148 {
 149         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 150         unsigned int cflag = tty->termios->c_cflag;
 151
 152         IRDA_DEBUG(2, __FUNCTION__ "()\n");
 153
 154         if ((cflag == old_termios->c_cflag) &&
 155             (RELEVANT_IFLAG(tty->termios->c_iflag) ==
 156              RELEVANT_IFLAG(old_termios->c_iflag)))
 157         {
 158                 return;
 159         }
 160
 161         ircomm_tty_change_speed(self);
 162
 163         /* Handle transition to B0 status */
 164         if ((old_termios->c_cflag & CBAUD) &&
 165             !(cflag & CBAUD)) {
 166                 self->settings.dte &= ~(IRCOMM_DTR|IRCOMM_RTS);
 167                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 168         }
 169
 170         /* Handle transition away from B0 status */
 171         if (!(old_termios->c_cflag & CBAUD) &&
 172             (cflag & CBAUD)) {
 173                 self->settings.dte |= IRCOMM_DTR;
 174                 if (!(tty->termios->c_cflag & CRTSCTS) ||
 175                     !test_bit(TTY_THROTTLED, &tty->flags)) {
 176                         self->settings.dte |= IRCOMM_RTS;
 177                 }
 178                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 179         }
 180
 181         /* Handle turning off CRTSCTS */
 182         if ((old_termios->c_cflag & CRTSCTS) &&
 183             !(tty->termios->c_cflag & CRTSCTS))
 184         {
 185                 tty->hw_stopped = 0;
 186                 ircomm_tty_start(tty);
 187         }
 188 }
 189
 190 /*
 191  * Function ircomm_tty_get_modem_info (self, value)
 192  *
 193  *
 194  *
 195  */
 196 static int ircomm_tty_get_modem_info(struct ircomm_tty_cb *self,
 197                                      unsigned int *value)
 198 {
 199         unsigned int result;
 200
 201         IRDA_DEBUG(2, __FUNCTION__ "()\n");
 202
 203         result =  ((self->settings.dte & IRCOMM_RTS) ? TIOCM_RTS : 0)
 204                 | ((self->settings.dte & IRCOMM_DTR) ? TIOCM_DTR : 0)
 205                 | ((self->settings.dce & IRCOMM_CD)  ? TIOCM_CAR : 0)
 206                 | ((self->settings.dce & IRCOMM_RI)  ? TIOCM_RNG : 0)
 207                 | ((self->settings.dce & IRCOMM_DSR) ? TIOCM_DSR : 0)
 208                 | ((self->settings.dce & IRCOMM_CTS) ? TIOCM_CTS : 0);
 209
 210         return put_user(result, value);
 211 }
 212
 213 /*
 214  * Function set_modem_info (driver, cmd, value)
 215  *
 216  *
 217  *
 218  */
 219 static int ircomm_tty_set_modem_info(struct ircomm_tty_cb *self,
 220                                      unsigned int cmd, unsigned int *value)
 221 {
 222         unsigned int arg;
 223         __u8 old_rts, old_dtr;
 224         int error;
 225
 226         IRDA_DEBUG(2, __FUNCTION__ "()\n");
 227
 228         ASSERT(self != NULL, return -1;);
 229         ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 230
 231         error = get_user(arg, value);
 232         if (error)
 233                 return error;
 234
 235         old_rts = self->settings.dte & IRCOMM_RTS;
 236         old_dtr = self->settings.dte & IRCOMM_DTR;
 237
 238         switch (cmd) {
 239         case TIOCMBIS:
 240                 if (arg & TIOCM_RTS)
 241                         self->settings.dte |= IRCOMM_RTS;
 242                 if (arg & TIOCM_DTR)
 243                         self->settings.dte |= IRCOMM_DTR;
 244                 break;
 245
 246         case TIOCMBIC:
 247                 if (arg & TIOCM_RTS)
 248                         self->settings.dte &= ~IRCOMM_RTS;
 249                 if (arg & TIOCM_DTR)
 250                         self->settings.dte &= ~IRCOMM_DTR;
 251                 break;
 252
 253         case TIOCMSET:
 254                 self->settings.dte =
 255                         ((self->settings.dte & ~(IRCOMM_RTS | IRCOMM_DTR))
 256                          | ((arg & TIOCM_RTS) ? IRCOMM_RTS : 0)
 257                          | ((arg & TIOCM_DTR) ? IRCOMM_DTR : 0));
 258                 break;
 259
 260         default:
 261                 return -EINVAL;
 262         }
 263
 264         if ((self->settings.dte & IRCOMM_RTS) != old_rts)
 265                 self->settings.dte |= IRCOMM_DELTA_RTS;
 266
 267         if ((self->settings.dte & IRCOMM_DTR) != old_dtr)
 268                 self->settings.dte |= IRCOMM_DELTA_DTR;
 269
 270         ircomm_param_request(self, IRCOMM_DTE, TRUE);
 271
 272         return 0;
 273 }
 274
 275 /*
 276  * Function get_serial_info (driver, retinfo)
 277  *
 278  *
 279  *
 280  */
 281 static int ircomm_tty_get_serial_info(struct ircomm_tty_cb *self,
 282                                       struct serial_struct *retinfo)
 283 {
 284         struct serial_struct info;
 285
 286         if (!retinfo)
 287                 return -EFAULT;
 288
 289         IRDA_DEBUG(2, __FUNCTION__ "()\n");
 290
 291         memset(&info, 0, sizeof(info));
 292         info.line = self->line;
 293         info.flags = self->flags;
 294         info.baud_base = self->settings.data_rate;
 295         info.close_delay = self->close_delay;
 296         info.closing_wait = self->closing_wait;
 297
 298         /* For compatibility  */
 299         info.type = PORT_16550A;
 300         info.port = 0;
 301         info.irq = 0;
 302         info.xmit_fifo_size = 0;
 303         info.hub6 = 0;
 304         info.custom_divisor = 0;
 305
 306         if (copy_to_user(retinfo, &info, sizeof(*retinfo)))
 307                 return -EFAULT;
 308
 309         return 0;
 310 }
 311
 312 /*
 313  * Function set_serial_info (driver, new_info)
 314  *
 315  *
 316  *
 317  */
 318 static int ircomm_tty_set_serial_info(struct ircomm_tty_cb *self,
 319                                       struct serial_struct *new_info)
 320 {
 321 #if 0
 322         struct serial_struct new_serial;
 323         struct ircomm_tty_cb old_state, *state;
 324
 325         IRDA_DEBUG(0, __FUNCTION__ "()\n");
 326
 327         if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
 328                 return -EFAULT;
 329
 330
 331         state = self
 332         old_state = *self;
 333
 334         if (!capable(CAP_SYS_ADMIN)) {
 335                 if ((new_serial.baud_base != state->settings.data_rate) ||
 336                     (new_serial.close_delay != state->close_delay) ||
 337                     ((new_serial.flags & ~ASYNC_USR_MASK) !=
 338                      (self->flags & ~ASYNC_USR_MASK)))
 339                         return -EPERM;
 340                 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
 341                                  (new_serial.flags & ASYNC_USR_MASK));
 342                 self->flags = ((self->flags & ~ASYNC_USR_MASK) |
 343                                (new_serial.flags & ASYNC_USR_MASK));
 344                 /* self->custom_divisor = new_serial.custom_divisor; */
 345                 goto check_and_exit;
 346         }
 347
 348         /*
 349          * OK, past this point, all the error checking has been done.
 350          * At this point, we start making changes.....
 351          */
 352
 353         if (self->settings.data_rate != new_serial.baud_base) {
 354                 self->settings.data_rate = new_serial.baud_base;
 355                 ircomm_param_request(self, IRCOMM_DATA_RATE, TRUE);
 356         }
 357
 358         self->close_delay = new_serial.close_delay * HZ/100;
 359         self->closing_wait = new_serial.closing_wait * HZ/100;
 360         /* self->custom_divisor = new_serial.custom_divisor; */
 361
 362         self->flags = ((self->flags & ~ASYNC_FLAGS) |
 363                        (new_serial.flags & ASYNC_FLAGS));
 364         self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 365
 366  check_and_exit:
 367
 368         if (self->flags & ASYNC_INITIALIZED) {
 369                 if (((old_state.flags & ASYNC_SPD_MASK) !=
 370                      (self->flags & ASYNC_SPD_MASK)) ||
 371                     (old_driver.custom_divisor != driver->custom_divisor)) {
 372                         if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
 373                                 driver->tty->alt_speed = 57600;
 374                         if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
 375                                 driver->tty->alt_speed = 115200;
 376                         if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
 377                                 driver->tty->alt_speed = 230400;
 378                         if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
 379                                 driver->tty->alt_speed = 460800;
 380                         ircomm_tty_change_speed(driver);
 381                 }
 382         }
 383 #endif
 384         return 0;
 385 }
 386
 387 /*
 388  * Function ircomm_tty_ioctl (tty, file, cmd, arg)
 389  *
 390  *
 391  *
 392  */
 393 int ircomm_tty_ioctl(struct tty_struct *tty, struct file *file,
 394                      unsigned int cmd, unsigned long arg)
 395 {
 396         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 397         int ret = 0;
 398
 399         IRDA_DEBUG(2, __FUNCTION__ "()\n");
 400
 401         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
 402             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
 403             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
 404                 if (tty->flags & (1 << TTY_IO_ERROR))
 405                     return -EIO;
 406         }
 407
 408         switch (cmd) {
 409         case TIOCMGET:
 410                 ret = ircomm_tty_get_modem_info(self, (unsigned int *) arg);
 411                 break;
 412         case TIOCMBIS:
 413         case TIOCMBIC:
 414         case TIOCMSET:
 415                 ret = ircomm_tty_set_modem_info(self, cmd, (unsigned int *) arg);
 416                 break;
 417         case TIOCGSERIAL:
 418                 ret = ircomm_tty_get_serial_info(self, (struct serial_struct *) arg);
 419                 break;
 420         case TIOCSSERIAL:
 421                 ret = ircomm_tty_set_serial_info(self, (struct serial_struct *) arg);
 422                 break;
 423         case TIOCMIWAIT:
 424                 IRDA_DEBUG(0, "(), TIOCMIWAIT, not impl!\n");
 425                 break;
 426
 427         case TIOCGICOUNT:
 428                 IRDA_DEBUG(0, __FUNCTION__ "(), TIOCGICOUNT not impl!\n");
 429 #if 0
 430                 save_flags(flags); cli();
 431                 cnow = driver->icount;
 432                 restore_flags(flags);
 433                 p_cuser = (struct serial_icounter_struct *) arg;
 434                 error = put_user(cnow.cts, &p_cuser->cts);
 435                 if (error) return error;
 436                 error = put_user(cnow.dsr, &p_cuser->dsr);
 437                 if (error) return error;
 438                 error = put_user(cnow.rng, &p_cuser->rng);
 439                 if (error) return error;
 440                 error = put_user(cnow.dcd, &p_cuser->dcd);
 441                 if (error) return error;
 442                 error = put_user(cnow.rx, &p_cuser->rx);
 443                 if (error) return error;
 444                 error = put_user(cnow.tx, &p_cuser->tx);
 445                 if (error) return error;
 446                 error = put_user(cnow.frame, &p_cuser->frame);
 447                 if (error) return error;
 448                 error = put_user(cnow.overrun, &p_cuser->overrun);
 449                 if (error) return error;
 450                 error = put_user(cnow.parity, &p_cuser->parity);
 451                 if (error) return error;
 452                 error = put_user(cnow.brk, &p_cuser->brk);
 453                 if (error) return error;
 454                 error = put_user(cnow.buf_overrun, &p_cuser->buf_overrun);
 455                 if (error) return error;
 456 #endif
 457                 return 0;
 458         default:
 459                 ret = -ENOIOCTLCMD;  /* ioctls which we must ignore */
 460         }
 461         return ret;
 462 }
 463
 464
 465