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/termios.h>
  34 #include <linux/tty.h>
  35 #include <linux/serial.h>
  36
  37 #include <asm/uaccess.h>
  38
  39 #include <net/irda/irda.h>
  40 #include <net/irda/irmod.h>
  41
  42 #include <net/irda/ircomm_core.h>
  43 #include <net/irda/ircomm_param.h>
  44 #include <net/irda/ircomm_tty_attach.h>
  45 #include <net/irda/ircomm_tty.h>
  46
  47 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
  48
  49 /*
  50  * Function ircomm_tty_change_speed (driver)
  51  *
  52  *    Change speed of the driver. If the remote device is a DCE, then this
  53  *    should make it change the speed of its serial port
  54  */
  55 static void ircomm_tty_change_speed(struct ircomm_tty_cb *self)
  56 {
  57         unsigned cflag, cval;
  58         int baud;
  59
  60         IRDA_DEBUG(2, "%s()\n", __func__ );
  61
  62         if (!self->tty || !self->tty->termios || !self->ircomm)
  63                 return;
  64
  65         cflag = self->tty->termios->c_cflag;
  66
  67         /*  byte size and parity */
  68         switch (cflag & CSIZE) {
  69         case CS5: cval = IRCOMM_WSIZE_5; break;
  70         case CS6: cval = IRCOMM_WSIZE_6; break;
  71         case CS7: cval = IRCOMM_WSIZE_7; break;
  72         case CS8: cval = IRCOMM_WSIZE_8; break;
  73         default:  cval = IRCOMM_WSIZE_5; break;
  74         }
  75         if (cflag & CSTOPB)
  76                 cval |= IRCOMM_2_STOP_BIT;
  77
  78         if (cflag & PARENB)
  79                 cval |= IRCOMM_PARITY_ENABLE;
  80         if (!(cflag & PARODD))
  81                 cval |= IRCOMM_PARITY_EVEN;
  82
  83         /* Determine divisor based on baud rate */
  84         baud = tty_get_baud_rate(self->tty);
  85         if (!baud)
  86                 baud = 9600;    /* B0 transition handled in rs_set_termios */
  87
  88         self->settings.data_rate = baud;
  89         ircomm_param_request(self, IRCOMM_DATA_RATE, FALSE);
  90
  91         /* CTS flow control flag and modem status interrupts */
  92         if (cflag & CRTSCTS) {
  93                 self->flags |= ASYNC_CTS_FLOW;
  94                 self->settings.flow_control |= IRCOMM_RTS_CTS_IN;
  95                 /* This got me. Bummer. Jean II */
  96                 if (self->service_type == IRCOMM_3_WIRE_RAW)
  97                         IRDA_WARNING("%s(), enabling RTS/CTS on link that doesn't support it (3-wire-raw)\n", __func__);
  98         } else {
  99                 self->flags &= ~ASYNC_CTS_FLOW;
 100                 self->settings.flow_control &= ~IRCOMM_RTS_CTS_IN;
 101         }
 102         if (cflag & CLOCAL)
 103                 self->flags &= ~ASYNC_CHECK_CD;
 104         else
 105                 self->flags |= ASYNC_CHECK_CD;
 106 #if 0
 107         /*
 108          * Set up parity check flag
 109          */
 110
 111         if (I_INPCK(self->tty))
 112                 driver->read_status_mask |= LSR_FE | LSR_PE;
 113         if (I_BRKINT(driver->tty) || I_PARMRK(driver->tty))
 114                 driver->read_status_mask |= LSR_BI;
 115
 116         /*
 117          * Characters to ignore
 118          */
 119         driver->ignore_status_mask = 0;
 120         if (I_IGNPAR(driver->tty))
 121                 driver->ignore_status_mask |= LSR_PE | LSR_FE;
 122
 123         if (I_IGNBRK(self->tty)) {
 124                 self->ignore_status_mask |= LSR_BI;
 125                 /*
 126                  * If we're ignore parity and break indicators, ignore
 127                  * overruns too. (For real raw support).
 128                  */
 129                 if (I_IGNPAR(self->tty))
 130                         self->ignore_status_mask |= LSR_OE;
 131         }
 132 #endif
 133         self->settings.data_format = cval;
 134
 135         ircomm_param_request(self, IRCOMM_DATA_FORMAT, FALSE);
 136         ircomm_param_request(self, IRCOMM_FLOW_CONTROL, TRUE);
 137 }
 138
 139 /*
 140  * Function ircomm_tty_set_termios (tty, old_termios)
 141  *
 142  *    This routine allows the tty driver to be notified when device's
 143  *    termios settings have changed.  Note that a well-designed tty driver
 144  *    should be prepared to accept the case where old == NULL, and try to
 145  *    do something rational.
 146  */
 147 void ircomm_tty_set_termios(struct tty_struct *tty,
 148                             struct ktermios *old_termios)
 149 {
 150         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 151         unsigned int cflag = tty->termios->c_cflag;
 152
 153         IRDA_DEBUG(2, "%s()\n", __func__ );
 154
 155         if ((cflag == old_termios->c_cflag) &&
 156             (RELEVANT_IFLAG(tty->termios->c_iflag) ==
 157              RELEVANT_IFLAG(old_termios->c_iflag)))
 158         {
 159                 return;
 160         }
 161
 162         ircomm_tty_change_speed(self);
 163
 164         /* Handle transition to B0 status */
 165         if ((old_termios->c_cflag & CBAUD) &&
 166             !(cflag & CBAUD)) {
 167                 self->settings.dte &= ~(IRCOMM_DTR|IRCOMM_RTS);
 168                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 169         }
 170
 171         /* Handle transition away from B0 status */
 172         if (!(old_termios->c_cflag & CBAUD) &&
 173             (cflag & CBAUD)) {
 174                 self->settings.dte |= IRCOMM_DTR;
 175                 if (!(tty->termios->c_cflag & CRTSCTS) ||
 176                     !test_bit(TTY_THROTTLED, &tty->flags)) {
 177                         self->settings.dte |= IRCOMM_RTS;
 178                 }
 179                 ircomm_param_request(self, IRCOMM_DTE, TRUE);
 180         }
 181
 182         /* Handle turning off CRTSCTS */
 183         if ((old_termios->c_cflag & CRTSCTS) &&
 184             !(tty->termios->c_cflag & CRTSCTS))
 185         {
 186                 tty->hw_stopped = 0;
 187                 ircomm_tty_start(tty);
 188         }
 189 }
 190
 191 /*
 192  * Function ircomm_tty_tiocmget (tty)
 193  *
 194  *
 195  *
 196  */
 197 int ircomm_tty_tiocmget(struct tty_struct *tty)
 198 {
 199         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 200         unsigned int result;
 201
 202         IRDA_DEBUG(2, "%s()\n", __func__ );
 203
 204         if (tty->flags & (1 << TTY_IO_ERROR))
 205                 return -EIO;
 206
 207         result =  ((self->settings.dte & IRCOMM_RTS) ? TIOCM_RTS : 0)
 208                 | ((self->settings.dte & IRCOMM_DTR) ? TIOCM_DTR : 0)
 209                 | ((self->settings.dce & IRCOMM_CD)  ? TIOCM_CAR : 0)
 210                 | ((self->settings.dce & IRCOMM_RI)  ? TIOCM_RNG : 0)
 211                 | ((self->settings.dce & IRCOMM_DSR) ? TIOCM_DSR : 0)
 212                 | ((self->settings.dce & IRCOMM_CTS) ? TIOCM_CTS : 0);
 213         return result;
 214 }
 215
 216 /*
 217  * Function ircomm_tty_tiocmset (tty, set, clear)
 218  *
 219  *
 220  *
 221  */
 222 int ircomm_tty_tiocmset(struct tty_struct *tty,
 223                         unsigned int set, unsigned int clear)
 224 {
 225         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 226
 227         IRDA_DEBUG(2, "%s()\n", __func__ );
 228
 229         if (tty->flags & (1 << TTY_IO_ERROR))
 230                 return -EIO;
 231
 232         IRDA_ASSERT(self != NULL, return -1;);
 233         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 234
 235         if (set & TIOCM_RTS)
 236                 self->settings.dte |= IRCOMM_RTS;
 237         if (set & TIOCM_DTR)
 238                 self->settings.dte |= IRCOMM_DTR;
 239
 240         if (clear & TIOCM_RTS)
 241                 self->settings.dte &= ~IRCOMM_RTS;
 242         if (clear & TIOCM_DTR)
 243                 self->settings.dte &= ~IRCOMM_DTR;
 244
 245         if ((set|clear) & TIOCM_RTS)
 246                 self->settings.dte |= IRCOMM_DELTA_RTS;
 247         if ((set|clear) & TIOCM_DTR)
 248                 self->settings.dte |= IRCOMM_DELTA_DTR;
 249
 250         ircomm_param_request(self, IRCOMM_DTE, TRUE);
 251
 252         return 0;
 253 }
 254
 255 /*
 256  * Function get_serial_info (driver, retinfo)
 257  *
 258  *
 259  *
 260  */
 261 static int ircomm_tty_get_serial_info(struct ircomm_tty_cb *self,
 262                                       struct serial_struct __user *retinfo)
 263 {
 264         struct serial_struct info;
 265
 266         if (!retinfo)
 267                 return -EFAULT;
 268
 269         IRDA_DEBUG(2, "%s()\n", __func__ );
 270
 271         memset(&info, 0, sizeof(info));
 272         info.line = self->line;
 273         info.flags = self->flags;
 274         info.baud_base = self->settings.data_rate;
 275         info.close_delay = self->close_delay;
 276         info.closing_wait = self->closing_wait;
 277
 278         /* For compatibility  */
 279         info.type = PORT_16550A;
 280         info.port = 0;
 281         info.irq = 0;
 282         info.xmit_fifo_size = 0;
 283         info.hub6 = 0;
 284         info.custom_divisor = 0;
 285
 286         if (copy_to_user(retinfo, &info, sizeof(*retinfo)))
 287                 return -EFAULT;
 288
 289         return 0;
 290 }
 291
 292 /*
 293  * Function set_serial_info (driver, new_info)
 294  *
 295  *
 296  *
 297  */
 298 static int ircomm_tty_set_serial_info(struct ircomm_tty_cb *self,
 299                                       struct serial_struct __user *new_info)
 300 {
 301 #if 0
 302         struct serial_struct new_serial;
 303         struct ircomm_tty_cb old_state, *state;
 304
 305         IRDA_DEBUG(0, "%s()\n", __func__ );
 306
 307         if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
 308                 return -EFAULT;
 309
 310
 311         state = self
 312         old_state = *self;
 313
 314         if (!capable(CAP_SYS_ADMIN)) {
 315                 if ((new_serial.baud_base != state->settings.data_rate) ||
 316                     (new_serial.close_delay != state->close_delay) ||
 317                     ((new_serial.flags & ~ASYNC_USR_MASK) !=
 318                      (self->flags & ~ASYNC_USR_MASK)))
 319                         return -EPERM;
 320                 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
 321                                  (new_serial.flags & ASYNC_USR_MASK));
 322                 self->flags = ((self->flags & ~ASYNC_USR_MASK) |
 323                                (new_serial.flags & ASYNC_USR_MASK));
 324                 /* self->custom_divisor = new_serial.custom_divisor; */
 325                 goto check_and_exit;
 326         }
 327
 328         /*
 329          * OK, past this point, all the error checking has been done.
 330          * At this point, we start making changes.....
 331          */
 332
 333         if (self->settings.data_rate != new_serial.baud_base) {
 334                 self->settings.data_rate = new_serial.baud_base;
 335                 ircomm_param_request(self, IRCOMM_DATA_RATE, TRUE);
 336         }
 337
 338         self->close_delay = new_serial.close_delay * HZ/100;
 339         self->closing_wait = new_serial.closing_wait * HZ/100;
 340         /* self->custom_divisor = new_serial.custom_divisor; */
 341
 342         self->flags = ((self->flags & ~ASYNC_FLAGS) |
 343                        (new_serial.flags & ASYNC_FLAGS));
 344         self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 345
 346  check_and_exit:
 347
 348         if (self->flags & ASYNC_INITIALIZED) {
 349                 if (((old_state.flags & ASYNC_SPD_MASK) !=
 350                      (self->flags & ASYNC_SPD_MASK)) ||
 351                     (old_driver.custom_divisor != driver->custom_divisor)) {
 352                         if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
 353                                 driver->tty->alt_speed = 57600;
 354                         if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
 355                                 driver->tty->alt_speed = 115200;
 356                         if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
 357                                 driver->tty->alt_speed = 230400;
 358                         if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
 359                                 driver->tty->alt_speed = 460800;
 360                         ircomm_tty_change_speed(driver);
 361                 }
 362         }
 363 #endif
 364         return 0;
 365 }
 366
 367 /*
 368  * Function ircomm_tty_ioctl (tty, cmd, arg)
 369  *
 370  *
 371  *
 372  */
 373 int ircomm_tty_ioctl(struct tty_struct *tty,
 374                      unsigned int cmd, unsigned long arg)
 375 {
 376         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 377         int ret = 0;
 378
 379         IRDA_DEBUG(2, "%s()\n", __func__ );
 380
 381         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
 382             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
 383             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
 384                 if (tty->flags & (1 << TTY_IO_ERROR))
 385                     return -EIO;
 386         }
 387
 388         switch (cmd) {
 389         case TIOCGSERIAL:
 390                 ret = ircomm_tty_get_serial_info(self, (struct serial_struct __user *) arg);
 391                 break;
 392         case TIOCSSERIAL:
 393                 ret = ircomm_tty_set_serial_info(self, (struct serial_struct __user *) arg);
 394                 break;
 395         case TIOCMIWAIT:
 396                 IRDA_DEBUG(0, "(), TIOCMIWAIT, not impl!\n");
 397                 break;
 398
 399         case TIOCGICOUNT:
 400                 IRDA_DEBUG(0, "%s(), TIOCGICOUNT not impl!\n", __func__ );
 401 #if 0
 402                 save_flags(flags); cli();
 403                 cnow = driver->icount;
 404                 restore_flags(flags);
 405                 p_cuser = (struct serial_icounter_struct __user *) arg;
 406                 if (put_user(cnow.cts, &p_cuser->cts) ||
 407                     put_user(cnow.dsr, &p_cuser->dsr) ||
 408                     put_user(cnow.rng, &p_cuser->rng) ||
 409                     put_user(cnow.dcd, &p_cuser->dcd) ||
 410                     put_user(cnow.rx, &p_cuser->rx) ||
 411                     put_user(cnow.tx, &p_cuser->tx) ||
 412                     put_user(cnow.frame, &p_cuser->frame) ||
 413                     put_user(cnow.overrun, &p_cuser->overrun) ||
 414                     put_user(cnow.parity, &p_cuser->parity) ||
 415                     put_user(cnow.brk, &p_cuser->brk) ||
 416                     put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
 417                         return -EFAULT;
 418 #endif
 419                 return 0;
 420         default:
 421                 ret = -ENOIOCTLCMD;  /* ioctls which we must ignore */
 422         }
 423         return ret;
 424 }
 425
 426
 427