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, see <http://www.gnu.org/licenses/>.
  26  *
  27  ********************************************************************/
  28
  29 #include <linux/init.h>
  30 #include <linux/fs.h>
  31 #include <linux/termios.h>
  32 #include <linux/tty.h>
  33 #include <linux/serial.h>
  34
  35 #include <asm/uaccess.h>
  36
  37 #include <net/irda/irda.h>
  38 #include <net/irda/irmod.h>
  39
  40 #include <net/irda/ircomm_core.h>
  41 #include <net/irda/ircomm_param.h>
  42 #include <net/irda/ircomm_tty_attach.h>
  43 #include <net/irda/ircomm_tty.h>
  44
  45 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
  46
  47 /*
  48  * Function ircomm_tty_change_speed (driver)
  49  *
  50  *    Change speed of the driver. If the remote device is a DCE, then this
  51  *    should make it change the speed of its serial port
  52  */
  53 static void ircomm_tty_change_speed(struct ircomm_tty_cb *self,
  54                 struct tty_struct *tty)
  55 {
  56         unsigned int cflag, cval;
  57         int baud;
  58
  59         IRDA_DEBUG(2, "%s()\n", __func__ );
  60
  61         if (!self->ircomm)
  62                 return;
  63
  64         cflag = tty->termios.c_cflag;
  65
  66         /*  byte size and parity */
  67         switch (cflag & CSIZE) {
  68         case CS5: cval = IRCOMM_WSIZE_5; break;
  69         case CS6: cval = IRCOMM_WSIZE_6; break;
  70         case CS7: cval = IRCOMM_WSIZE_7; break;
  71         case CS8: cval = IRCOMM_WSIZE_8; break;
  72         default:  cval = IRCOMM_WSIZE_5; break;
  73         }
  74         if (cflag & CSTOPB)
  75                 cval |= IRCOMM_2_STOP_BIT;
  76
  77         if (cflag & PARENB)
  78                 cval |= IRCOMM_PARITY_ENABLE;
  79         if (!(cflag & PARODD))
  80                 cval |= IRCOMM_PARITY_EVEN;
  81
  82         /* Determine divisor based on baud rate */
  83         baud = tty_get_baud_rate(tty);
  84         if (!baud)
  85                 baud = 9600;    /* B0 transition handled in rs_set_termios */
  86
  87         self->settings.data_rate = baud;
  88         ircomm_param_request(self, IRCOMM_DATA_RATE, FALSE);
  89
  90         /* CTS flow control flag and modem status interrupts */
  91         if (cflag & CRTSCTS) {
  92                 self->port.flags |= ASYNC_CTS_FLOW;
  93                 self->settings.flow_control |= IRCOMM_RTS_CTS_IN;
  94                 /* This got me. Bummer. Jean II */
  95                 if (self->service_type == IRCOMM_3_WIRE_RAW)
  96                         IRDA_WARNING("%s(), enabling RTS/CTS on link that doesn't support it (3-wire-raw)\n", __func__);
  97         } else {
  98                 self->port.flags &= ~ASYNC_CTS_FLOW;
  99                 self->settings.flow_control &= ~IRCOMM_RTS_CTS_IN;
 100         }
 101         if (cflag & CLOCAL)
 102                 self->port.flags &= ~ASYNC_CHECK_CD;
 103         else
 104                 self->port.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 ktermios *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, "%s()\n", __func__ );
 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, tty);
 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_tiocmget (tty)
 192  *
 193  *
 194  *
 195  */
 196 int ircomm_tty_tiocmget(struct tty_struct *tty)
 197 {
 198         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 199         unsigned int result;
 200
 201         IRDA_DEBUG(2, "%s()\n", __func__ );
 202
 203         if (tty->flags & (1 << TTY_IO_ERROR))
 204                 return -EIO;
 205
 206         result =  ((self->settings.dte & IRCOMM_RTS) ? TIOCM_RTS : 0)
 207                 | ((self->settings.dte & IRCOMM_DTR) ? TIOCM_DTR : 0)
 208                 | ((self->settings.dce & IRCOMM_CD)  ? TIOCM_CAR : 0)
 209                 | ((self->settings.dce & IRCOMM_RI)  ? TIOCM_RNG : 0)
 210                 | ((self->settings.dce & IRCOMM_DSR) ? TIOCM_DSR : 0)
 211                 | ((self->settings.dce & IRCOMM_CTS) ? TIOCM_CTS : 0);
 212         return result;
 213 }
 214
 215 /*
 216  * Function ircomm_tty_tiocmset (tty, set, clear)
 217  *
 218  *
 219  *
 220  */
 221 int ircomm_tty_tiocmset(struct tty_struct *tty,
 222                         unsigned int set, unsigned int clear)
 223 {
 224         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 225
 226         IRDA_DEBUG(2, "%s()\n", __func__ );
 227
 228         if (tty->flags & (1 << TTY_IO_ERROR))
 229                 return -EIO;
 230
 231         IRDA_ASSERT(self != NULL, return -1;);
 232         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 233
 234         if (set & TIOCM_RTS)
 235                 self->settings.dte |= IRCOMM_RTS;
 236         if (set & TIOCM_DTR)
 237                 self->settings.dte |= IRCOMM_DTR;
 238
 239         if (clear & TIOCM_RTS)
 240                 self->settings.dte &= ~IRCOMM_RTS;
 241         if (clear & TIOCM_DTR)
 242                 self->settings.dte &= ~IRCOMM_DTR;
 243
 244         if ((set|clear) & TIOCM_RTS)
 245                 self->settings.dte |= IRCOMM_DELTA_RTS;
 246         if ((set|clear) & TIOCM_DTR)
 247                 self->settings.dte |= IRCOMM_DELTA_DTR;
 248
 249         ircomm_param_request(self, IRCOMM_DTE, TRUE);
 250
 251         return 0;
 252 }
 253
 254 /*
 255  * Function get_serial_info (driver, retinfo)
 256  *
 257  *
 258  *
 259  */
 260 static int ircomm_tty_get_serial_info(struct ircomm_tty_cb *self,
 261                                       struct serial_struct __user *retinfo)
 262 {
 263         struct serial_struct info;
 264
 265         if (!retinfo)
 266                 return -EFAULT;
 267
 268         IRDA_DEBUG(2, "%s()\n", __func__ );
 269
 270         memset(&info, 0, sizeof(info));
 271         info.line = self->line;
 272         info.flags = self->port.flags;
 273         info.baud_base = self->settings.data_rate;
 274         info.close_delay = self->port.close_delay;
 275         info.closing_wait = self->port.closing_wait;
 276
 277         /* For compatibility  */
 278         info.type = PORT_16550A;
 279         info.port = 0;
 280         info.irq = 0;
 281         info.xmit_fifo_size = 0;
 282         info.hub6 = 0;
 283         info.custom_divisor = 0;
 284
 285         if (copy_to_user(retinfo, &info, sizeof(*retinfo)))
 286                 return -EFAULT;
 287
 288         return 0;
 289 }
 290
 291 /*
 292  * Function set_serial_info (driver, new_info)
 293  *
 294  *
 295  *
 296  */
 297 static int ircomm_tty_set_serial_info(struct ircomm_tty_cb *self,
 298                                       struct serial_struct __user *new_info)
 299 {
 300 #if 0
 301         struct serial_struct new_serial;
 302         struct ircomm_tty_cb old_state, *state;
 303
 304         IRDA_DEBUG(0, "%s()\n", __func__ );
 305
 306         if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
 307                 return -EFAULT;
 308
 309
 310         state = self
 311         old_state = *self;
 312
 313         if (!capable(CAP_SYS_ADMIN)) {
 314                 if ((new_serial.baud_base != state->settings.data_rate) ||
 315                     (new_serial.close_delay != state->close_delay) ||
 316                     ((new_serial.flags & ~ASYNC_USR_MASK) !=
 317                      (self->flags & ~ASYNC_USR_MASK)))
 318                         return -EPERM;
 319                 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
 320                                  (new_serial.flags & ASYNC_USR_MASK));
 321                 self->flags = ((self->flags & ~ASYNC_USR_MASK) |
 322                                (new_serial.flags & ASYNC_USR_MASK));
 323                 /* self->custom_divisor = new_serial.custom_divisor; */
 324                 goto check_and_exit;
 325         }
 326
 327         /*
 328          * OK, past this point, all the error checking has been done.
 329          * At this point, we start making changes.....
 330          */
 331
 332         if (self->settings.data_rate != new_serial.baud_base) {
 333                 self->settings.data_rate = new_serial.baud_base;
 334                 ircomm_param_request(self, IRCOMM_DATA_RATE, TRUE);
 335         }
 336
 337         self->close_delay = new_serial.close_delay * HZ/100;
 338         self->closing_wait = new_serial.closing_wait * HZ/100;
 339         /* self->custom_divisor = new_serial.custom_divisor; */
 340
 341         self->flags = ((self->flags & ~ASYNC_FLAGS) |
 342                        (new_serial.flags & ASYNC_FLAGS));
 343         self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 344
 345  check_and_exit:
 346
 347         if (self->flags & ASYNC_INITIALIZED) {
 348                 if (((old_state.flags & ASYNC_SPD_MASK) !=
 349                      (self->flags & ASYNC_SPD_MASK)) ||
 350                     (old_driver.custom_divisor != driver->custom_divisor)) {
 351                         if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
 352                                 driver->tty->alt_speed = 57600;
 353                         if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
 354                                 driver->tty->alt_speed = 115200;
 355                         if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
 356                                 driver->tty->alt_speed = 230400;
 357                         if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
 358                                 driver->tty->alt_speed = 460800;
 359                         ircomm_tty_change_speed(driver);
 360                 }
 361         }
 362 #endif
 363         return 0;
 364 }
 365
 366 /*
 367  * Function ircomm_tty_ioctl (tty, cmd, arg)
 368  *
 369  *
 370  *
 371  */
 372 int ircomm_tty_ioctl(struct tty_struct *tty,
 373                      unsigned int cmd, unsigned long arg)
 374 {
 375         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 376         int ret = 0;
 377
 378         IRDA_DEBUG(2, "%s()\n", __func__ );
 379
 380         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
 381             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
 382             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
 383                 if (tty->flags & (1 << TTY_IO_ERROR))
 384                     return -EIO;
 385         }
 386
 387         switch (cmd) {
 388         case TIOCGSERIAL:
 389                 ret = ircomm_tty_get_serial_info(self, (struct serial_struct __user *) arg);
 390                 break;
 391         case TIOCSSERIAL:
 392                 ret = ircomm_tty_set_serial_info(self, (struct serial_struct __user *) arg);
 393                 break;
 394         case TIOCMIWAIT:
 395                 IRDA_DEBUG(0, "(), TIOCMIWAIT, not impl!\n");
 396                 break;
 397
 398         case TIOCGICOUNT:
 399                 IRDA_DEBUG(0, "%s(), TIOCGICOUNT not impl!\n", __func__ );
 400 #if 0
 401                 save_flags(flags); cli();
 402                 cnow = driver->icount;
 403                 restore_flags(flags);
 404                 p_cuser = (struct serial_icounter_struct __user *) arg;
 405                 if (put_user(cnow.cts, &p_cuser->cts) ||
 406                     put_user(cnow.dsr, &p_cuser->dsr) ||
 407                     put_user(cnow.rng, &p_cuser->rng) ||
 408                     put_user(cnow.dcd, &p_cuser->dcd) ||
 409                     put_user(cnow.rx, &p_cuser->rx) ||
 410                     put_user(cnow.tx, &p_cuser->tx) ||
 411                     put_user(cnow.frame, &p_cuser->frame) ||
 412                     put_user(cnow.overrun, &p_cuser->overrun) ||
 413                     put_user(cnow.parity, &p_cuser->parity) ||
 414                     put_user(cnow.brk, &p_cuser->brk) ||
 415                     put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
 416                         return -EFAULT;
 417 #endif
 418                 return 0;
 419         default:
 420                 ret = -ENOIOCTLCMD;  /* ioctls which we must ignore */
 421         }
 422         return ret;
 423 }
 424
 425
 426