LXR linux/net/irda/ircomm/ircomm_tty

   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 */
  55static void ircomm_tty_change_speed(struct ircomm_tty_cb *self,
  56                struct tty_struct *tty)
  57{
  58        unsigned int cflag, cval;
  59        int baud;
  60
  61        IRDA_DEBUG(2, "%s()\n", __func__ );
  62
  63        if (!self->ircomm)
  64                return;
  65
  66        cflag = tty->termios.c_cflag;
  67
  68        /*  byte size and parity */
  69        switch (cflag & CSIZE) {
  70        case CS5: cval = IRCOMM_WSIZE_5; break;
  71        case CS6: cval = IRCOMM_WSIZE_6; break;
  72        case CS7: cval = IRCOMM_WSIZE_7; break;
  73        case CS8: cval = IRCOMM_WSIZE_8; break;
  74        default:  cval = IRCOMM_WSIZE_5; break;
  75        }
  76        if (cflag & CSTOPB)
  77                cval |= IRCOMM_2_STOP_BIT;
  78
  79        if (cflag & PARENB)
  80                cval |= IRCOMM_PARITY_ENABLE;
  81        if (!(cflag & PARODD))
  82                cval |= IRCOMM_PARITY_EVEN;
  83
  84        /* Determine divisor based on baud rate */
  85        baud = tty_get_baud_rate(tty);
  86        if (!baud)
  87                baud = 9600;    /* B0 transition handled in rs_set_termios */
  88
  89        self->settings.data_rate = baud;
  90        ircomm_param_request(self, IRCOMM_DATA_RATE, FALSE);
  91
  92        /* CTS flow control flag and modem status interrupts */
  93        if (cflag & CRTSCTS) {
  94                self->port.flags |= ASYNC_CTS_FLOW;
  95                self->settings.flow_control |= IRCOMM_RTS_CTS_IN;
  96                /* This got me. Bummer. Jean II */
  97                if (self->service_type == IRCOMM_3_WIRE_RAW)
  98                        IRDA_WARNING("%s(), enabling RTS/CTS on link that doesn't support it (3-wire-raw)\n", __func__);
  99        } else {
 100                self->port.flags &= ~ASYNC_CTS_FLOW;
 101                self->settings.flow_control &= ~IRCOMM_RTS_CTS_IN;
 102        }
 103        if (cflag & CLOCAL)
 104                self->port.flags &= ~ASYNC_CHECK_CD;
 105        else
 106                self->port.flags |= ASYNC_CHECK_CD;
 107#if 0
 108        /*
 109         * Set up parity check flag
 110         */
 111
 112        if (I_INPCK(self->tty))
 113                driver->read_status_mask |= LSR_FE | LSR_PE;
 114        if (I_BRKINT(driver->tty) || I_PARMRK(driver->tty))
 115                driver->read_status_mask |= LSR_BI;
 116
 117        /*
 118         * Characters to ignore
 119         */
 120        driver->ignore_status_mask = 0;
 121        if (I_IGNPAR(driver->tty))
 122                driver->ignore_status_mask |= LSR_PE | LSR_FE;
 123
 124        if (I_IGNBRK(self->tty)) {
 125                self->ignore_status_mask |= LSR_BI;
 126                /*
 127                 * If we're ignore parity and break indicators, ignore
 128                 * overruns too. (For real raw support).
 129                 */
 130                if (I_IGNPAR(self->tty))
 131                        self->ignore_status_mask |= LSR_OE;
 132        }
 133#endif
 134        self->settings.data_format = cval;
 135
 136        ircomm_param_request(self, IRCOMM_DATA_FORMAT, FALSE);
 137        ircomm_param_request(self, IRCOMM_FLOW_CONTROL, TRUE);
 138}
 139
 140/*
 141 * Function ircomm_tty_set_termios (tty, old_termios)
 142 *
 143 *    This routine allows the tty driver to be notified when device's
 144 *    termios settings have changed.  Note that a well-designed tty driver
 145 *    should be prepared to accept the case where old == NULL, and try to
 146 *    do something rational.
 147 */
 148void ircomm_tty_set_termios(struct tty_struct *tty,
 149                            struct ktermios *old_termios)
 150{
 151        struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 152        unsigned int cflag = tty->termios.c_cflag;
 153
 154        IRDA_DEBUG(2, "%s()\n", __func__ );
 155
 156        if ((cflag == old_termios->c_cflag) &&
 157            (RELEVANT_IFLAG(tty->termios.c_iflag) ==
 158             RELEVANT_IFLAG(old_termios->c_iflag)))
 159        {
 160                return;
 161        }
 162
 163        ircomm_tty_change_speed(self, tty);
 164
 165        /* Handle transition to B0 status */
 166        if ((old_termios->c_cflag & CBAUD) &&
 167            !(cflag & CBAUD)) {
 168                self->settings.dte &= ~(IRCOMM_DTR|IRCOMM_RTS);
 169                ircomm_param_request(self, IRCOMM_DTE, TRUE);
 170        }
 171
 172        /* Handle transition away from B0 status */
 173        if (!(old_termios->c_cflag & CBAUD) &&
 174            (cflag & CBAUD)) {
 175                self->settings.dte |= IRCOMM_DTR;
 176                if (!(tty->termios.c_cflag & CRTSCTS) ||
 177                    !test_bit(TTY_THROTTLED, &tty->flags)) {
 178                        self->settings.dte |= IRCOMM_RTS;
 179                }
 180                ircomm_param_request(self, IRCOMM_DTE, TRUE);
 181        }
 182
 183        /* Handle turning off CRTSCTS */
 184        if ((old_termios->c_cflag & CRTSCTS) &&
 185            !(tty->termios.c_cflag & CRTSCTS))
 186        {
 187                tty->hw_stopped = 0;
 188                ircomm_tty_start(tty);
 189        }
 190}
 191
 192/*
 193 * Function ircomm_tty_tiocmget (tty)
 194 *
 195 *
 196 *
 197 */
 198int ircomm_tty_tiocmget(struct tty_struct *tty)
 199{
 200        struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 201        unsigned int result;
 202
 203        IRDA_DEBUG(2, "%s()\n", __func__ );
 204
 205        if (tty->flags & (1 << TTY_IO_ERROR))
 206                return -EIO;
 207
 208        result =  ((self->settings.dte & IRCOMM_RTS) ? TIOCM_RTS : 0)
 209                | ((self->settings.dte & IRCOMM_DTR) ? TIOCM_DTR : 0)
 210                | ((self->settings.dce & IRCOMM_CD)  ? TIOCM_CAR : 0)
 211                | ((self->settings.dce & IRCOMM_RI)  ? TIOCM_RNG : 0)
 212                | ((self->settings.dce & IRCOMM_DSR) ? TIOCM_DSR : 0)
 213                | ((self->settings.dce & IRCOMM_CTS) ? TIOCM_CTS : 0);
 214        return result;
 215}
 216
 217/*
 218 * Function ircomm_tty_tiocmset (tty, set, clear)
 219 *
 220 *
 221 *
 222 */
 223int ircomm_tty_tiocmset(struct tty_struct *tty,
 224                        unsigned int set, unsigned int clear)
 225{
 226        struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 227
 228        IRDA_DEBUG(2, "%s()\n", __func__ );
 229
 230        if (tty->flags & (1 << TTY_IO_ERROR))
 231                return -EIO;
 232
 233        IRDA_ASSERT(self != NULL, return -1;);
 234        IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 235
 236        if (set & TIOCM_RTS)
 237                self->settings.dte |= IRCOMM_RTS;
 238        if (set & TIOCM_DTR)
 239                self->settings.dte |= IRCOMM_DTR;
 240
 241        if (clear & TIOCM_RTS)
 242                self->settings.dte &= ~IRCOMM_RTS;
 243        if (clear & TIOCM_DTR)
 244                self->settings.dte &= ~IRCOMM_DTR;
 245
 246        if ((set|clear) & TIOCM_RTS)
 247                self->settings.dte |= IRCOMM_DELTA_RTS;
 248        if ((set|clear) & TIOCM_DTR)
 249                self->settings.dte |= IRCOMM_DELTA_DTR;
 250
 251        ircomm_param_request(self, IRCOMM_DTE, TRUE);
 252
 253        return 0;
 254}
 255
 256/*
 257 * Function get_serial_info (driver, retinfo)
 258 *
 259 *
 260 *
 261 */
 262static int ircomm_tty_get_serial_info(struct ircomm_tty_cb *self,
 263                                      struct serial_struct __user *retinfo)
 264{
 265        struct serial_struct info;
 266
 267        if (!retinfo)
 268                return -EFAULT;
 269
 270        IRDA_DEBUG(2, "%s()\n", __func__ );
 271
 272        memset(&info, 0, sizeof(info));
 273        info.line = self->line;
 274        info.flags = self->port.flags;
 275        info.baud_base = self->settings.data_rate;
 276        info.close_delay = self->port.close_delay;
 277        info.closing_wait = self->port.closing_wait;
 278
 279        /* For compatibility  */
 280        info.type = PORT_16550A;
 281        info.port = 0;
 282        info.irq = 0;
 283        info.xmit_fifo_size = 0;
 284        info.hub6 = 0;
 285        info.custom_divisor = 0;
 286
 287        if (copy_to_user(retinfo, &info, sizeof(*retinfo)))
 288                return -EFAULT;
 289
 290        return 0;
 291}
 292
 293/*
 294 * Function set_serial_info (driver, new_info)
 295 *
 296 *
 297 *
 298 */
 299static int ircomm_tty_set_serial_info(struct ircomm_tty_cb *self,
 300                                      struct serial_struct __user *new_info)
 301{
 302#if 0
 303        struct serial_struct new_serial;
 304        struct ircomm_tty_cb old_state, *state;
 305
 306        IRDA_DEBUG(0, "%s()\n", __func__ );
 307
 308        if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
 309                return -EFAULT;
 310
 311
 312        state = self
 313        old_state = *self;
 314
 315        if (!capable(CAP_SYS_ADMIN)) {
 316                if ((new_serial.baud_base != state->settings.data_rate) ||
 317                    (new_serial.close_delay != state->close_delay) ||
 318                    ((new_serial.flags & ~ASYNC_USR_MASK) !=
 319                     (self->flags & ~ASYNC_USR_MASK)))
 320                        return -EPERM;
 321                state->flags = ((state->flags & ~ASYNC_USR_MASK) |
 322                                 (new_serial.flags & ASYNC_USR_MASK));
 323                self->flags = ((self->flags & ~ASYNC_USR_MASK) |
 324                               (new_serial.flags & ASYNC_USR_MASK));
 325                /* self->custom_divisor = new_serial.custom_divisor; */
 326                goto check_and_exit;
 327        }
 328
 329        /*
 330         * OK, past this point, all the error checking has been done.
 331         * At this point, we start making changes.....
 332         */
 333
 334        if (self->settings.data_rate != new_serial.baud_base) {
 335                self->settings.data_rate = new_serial.baud_base;
 336                ircomm_param_request(self, IRCOMM_DATA_RATE, TRUE);
 337        }
 338
 339        self->close_delay = new_serial.close_delay * HZ/100;
 340        self->closing_wait = new_serial.closing_wait * HZ/100;
 341        /* self->custom_divisor = new_serial.custom_divisor; */
 342
 343        self->flags = ((self->flags & ~ASYNC_FLAGS) |
 344                       (new_serial.flags & ASYNC_FLAGS));
 345        self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 346
 347 check_and_exit:
 348
 349        if (self->flags & ASYNC_INITIALIZED) {
 350                if (((old_state.flags & ASYNC_SPD_MASK) !=
 351                     (self->flags & ASYNC_SPD_MASK)) ||
 352                    (old_driver.custom_divisor != driver->custom_divisor)) {
 353                        if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
 354                                driver->tty->alt_speed = 57600;
 355                        if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
 356                                driver->tty->alt_speed = 115200;
 357                        if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
 358                                driver->tty->alt_speed = 230400;
 359                        if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
 360                                driver->tty->alt_speed = 460800;
 361                        ircomm_tty_change_speed(driver);
 362                }
 363        }
 364#endif
 365        return 0;
 366}
 367
 368/*
 369 * Function ircomm_tty_ioctl (tty, cmd, arg)
 370 *
 371 *
 372 *
 373 */
 374int ircomm_tty_ioctl(struct tty_struct *tty,
 375                     unsigned int cmd, unsigned long arg)
 376{
 377        struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
 378        int ret = 0;
 379
 380        IRDA_DEBUG(2, "%s()\n", __func__ );
 381
 382        if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
 383            (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
 384            (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
 385                if (tty->flags & (1 << TTY_IO_ERROR))
 386                    return -EIO;
 387        }
 388
 389        switch (cmd) {
 390        case TIOCGSERIAL:
 391                ret = ircomm_tty_get_serial_info(self, (struct serial_struct __user *) arg);
 392                break;
 393        case TIOCSSERIAL:
 394                ret = ircomm_tty_set_serial_info(self, (struct serial_struct __user *) arg);
 395                break;
 396        case TIOCMIWAIT:
 397                IRDA_DEBUG(0, "(), TIOCMIWAIT, not impl!\n");
 398                break;
 399
 400        case TIOCGICOUNT:
 401                IRDA_DEBUG(0, "%s(), TIOCGICOUNT not impl!\n", __func__ );
 402#if 0
 403                save_flags(flags); cli();
 404                cnow = driver->icount;
 405                restore_flags(flags);
 406                p_cuser = (struct serial_icounter_struct __user *) arg;
 407                if (put_user(cnow.cts, &p_cuser->cts) ||
 408                    put_user(cnow.dsr, &p_cuser->dsr) ||
 409                    put_user(cnow.rng, &p_cuser->rng) ||
 410                    put_user(cnow.dcd, &p_cuser->dcd) ||
 411                    put_user(cnow.rx, &p_cuser->rx) ||
 412                    put_user(cnow.tx, &p_cuser->tx) ||
 413                    put_user(cnow.frame, &p_cuser->frame) ||
 414                    put_user(cnow.overrun, &p_cuser->overrun) ||
 415                    put_user(cnow.parity, &p_cuser->parity) ||
 416                    put_user(cnow.brk, &p_cuser->brk) ||
 417                    put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
 418                        return -EFAULT;
 419#endif
 420                return 0;
 421        default:
 422                ret = -ENOIOCTLCMD;  /* ioctls which we must ignore */
 423        }
 424        return ret;
 425}
 426
 427
 428
 429