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    Subject[PROBLEM] ircomm ioctls
    Hi,

    since upgrading to the 2.6.1 (from 2.4.22)

    I am gettig this error (while connecting to my mobile phone):
    ------
    # gsmctl -d /dev/ircomm0 ALL
    gsmctl[ERROR]: clearing DTR failed (errno: 22/Invalid argument)
    ------

    the code in: gsmlib-1.10/gsmlib/gsm_unix_serial.cc
    ------
    // toggle DTR to reset modem
    int mctl = TIOCM_DTR;
    if (ioctl(_fd, TIOCMBIC, &mctl) < 0)
    throwModemException(_("clearing DTR failed"));
    // the waiting time for DTR toggling is increased with each loop
    usleep(holdoff[initTries]);
    if (ioctl(_fd, TIOCMBIS, &mctl) < 0)
    throwModemException(_("setting DTR failed"));
    ------

    pointed me to tke kernel:
    the ioctls TIOCMBIC, TIOCMBIS, TIOCMSET and TIOCMGET are handled both in

    net/irda/ircomm/ircomm_tty_ioctl.c function ircomm_tty_ioctl()
    -----
    switch (cmd) {
    case TIOCMGET:
    ret = ircomm_tty_get_modem_info(self, (unsigned int *) arg);
    break;
    case TIOCMBIS:
    case TIOCMBIC:
    case TIOCMSET:
    ret = ircomm_tty_set_modem_info(self, cmd, (unsigned int *) arg);
    break;
    -----

    and in
    drivers/char/tty_io.c function tty_ioctl()
    -----
    switch (cmd) {
    ...
    case TIOCMGET:
    return tty_tiocmget(tty, file, arg);

    case TIOCMSET:
    case TIOCMBIC:
    case TIOCMBIS:
    return tty_tiocmset(tty, file, cmd, arg);
    }
    if (tty->driver->ioctl) {
    int retval = (tty->driver->ioctl)(tty, file, cmd, arg);
    if (retval != -ENOIOCTLCMD)
    return retval;
    }
    -----

    The tty_tiocmset() checks for driver->tiocmset and calls it. In case
    of ircomm driver->tiocmset is not set since those ioctls are meant
    to be handled by driver->ioctl, however tty_tiocmset returns with -EINVAL
    and driver->ioctl never gets called.

    I am beginner in the kernel programing, and therefore I would rather let more
    experienced to create the patch (I don't want to mess up something).

    I hope this descrition would be helpful, and somebody fixes the problem.

    Thank you in advance

    Jozef Vesely
    vesely@gjh.sk



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