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