- 根目录:
- drivers
- staging
- dgrp
- dgrp_tty.c
/*
*
* Copyright 1999 Digi International (www.digi.com)
* Gene Olson <Gene_Olson at digi dot com>
* James Puzzo <jamesp at digi dot com>
* Jeff Randall
* Scott Kilau <scottk at digi dot com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
*/
/*
*
* Filename:
*
* dgrp_tty.c
*
* Description:
*
* This file implements the tty driver functionality for the
* RealPort driver software.
*
* Author:
*
* James A. Puzzo
* Ann-Marie Westgate
*
*/
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/device.h>
#include <linux/sched.h>
#include <linux/uaccess.h>
#include "dgrp_common.h"
#ifndef _POSIX_VDISABLE
#define _POSIX_VDISABLE ('\0')
#endif
/*
* forward declarations
*/
static void drp_param(struct ch_struct *);
static void dgrp_tty_close(struct tty_struct *, struct file *);
/* ioctl helper functions */
static int set_modem_info(struct ch_struct *, unsigned int, unsigned int *);
static int get_modem_info(struct ch_struct *, unsigned int *);
static void dgrp_set_custom_speed(struct ch_struct *, int);
static int dgrp_tty_digigetedelay(struct tty_struct *, int *);
static int dgrp_tty_digisetedelay(struct tty_struct *, int *);
static int dgrp_send_break(struct ch_struct *, int);
static ushort tty_to_ch_flags(struct tty_struct *, char);
static tcflag_t ch_to_tty_flags(unsigned short, char);
static void dgrp_tty_input_start(struct tty_struct *);
static void dgrp_tty_input_stop(struct tty_struct *);
static void drp_wmove(struct ch_struct *, int, void*, int);
static int dgrp_tty_open(struct tty_struct *, struct file *);
static void dgrp_tty_close(struct tty_struct *, struct file *);
static int dgrp_tty_write(struct tty_struct *, const unsigned char *, int);
static int dgrp_tty_write_room(struct tty_struct *);
static void dgrp_tty_flush_buffer(struct tty_struct *);
static int dgrp_tty_chars_in_buffer(struct tty_struct *);
static int dgrp_tty_ioctl(struct tty_struct *, unsigned int, unsigned long);
static void dgrp_tty_set_termios(struct tty_struct *, struct ktermios *);
static void dgrp_tty_stop(struct tty_struct *);
static void dgrp_tty_start(struct tty_struct *);
static void dgrp_tty_throttle(struct tty_struct *);
static void dgrp_tty_unthrottle(struct tty_struct *);
static void dgrp_tty_hangup(struct tty_struct *);
static int dgrp_tty_put_char(struct tty_struct *, unsigned char);
static int dgrp_tty_tiocmget(struct tty_struct *);
static int dgrp_tty_tiocmset(struct tty_struct *, unsigned int, unsigned int);
static int dgrp_tty_send_break(struct tty_struct *, int);
static void dgrp_tty_send_xchar(struct tty_struct *, char);
/*
* tty defines
*/
#define SERIAL_TYPE_NORMAL 1
#define SERIAL_TYPE_CALLOUT 2
#define SERIAL_TYPE_XPRINT 3
/*
* tty globals/statics
*/
#define PORTSERVER_DIVIDEND 1843200
/*
* Default transparent print information.
*/
static struct digi_struct digi_init = {
.digi_flags = DIGI_COOK, /* Flags */
.digi_maxcps = 100, /* Max CPS */
.digi_maxchar = 50, /* Max chars in print queue */
.digi_bufsize = 100, /* Printer buffer size */
.digi_onlen = 4, /* size of printer on string */
.digi_offlen = 4, /* size of printer off string */
.digi_onstr = "\033[5i", /* ANSI printer on string */
.digi_offstr = "\033[4i", /* ANSI printer off string */
.digi_term = "ansi" /* default terminal type */
};
/*
* Define a local default termios struct. All ports will be created
* with this termios initially.
*
* This defines a raw port at 9600 baud, 8 data bits, no parity,
* 1 stop bit.
*/
static struct ktermios DefaultTermios = {
.c_iflag = (ICRNL | IXON),
.c_oflag = (OPOST | ONLCR),
.c_cflag = (B9600 | CS8 | CREAD | HUPCL | CLOCAL),
.c_lflag = (ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL
| ECHOKE | IEXTEN),
.c_cc = INIT_C_CC,
.c_line = 0,
};
/* Define our tty operations struct */
static const struct tty_operations dgrp_tty_ops = {
.open = dgrp_tty_open,
.close = dgrp_tty_close,
.write = dgrp_tty_write,
.write_room = dgrp_tty_write_room,
.flush_buffer = dgrp_tty_flush_buffer,
.chars_in_buffer = dgrp_tty_chars_in_buffer,
.flush_chars = NULL,
.ioctl = dgrp_tty_ioctl,
.set_termios = dgrp_tty_set_termios,
.stop = dgrp_tty_stop,
.start = dgrp_tty_start,
.throttle = dgrp_tty_throttle,
.unthrottle = dgrp_tty_unthrottle,
.hangup = dgrp_tty_hangup,
.put_char = dgrp_tty_put_char,
.tiocmget = dgrp_tty_tiocmget,
.tiocmset = dgrp_tty_tiocmset,
.break_ctl = dgrp_tty_send_break,
.send_xchar = dgrp_tty_send_xchar
};
static int calc_baud_rate(struct un_struct *un)
{
int i;
int brate;
struct baud_rates {
unsigned int rate;
unsigned int cflag;
};
static struct baud_rates baud_rates[] = {
{ 921600, B921600 },
{ 460800, B460800 },
{ 230400, B230400 },
{ 115200, B115200 },
{ 57600, B57600 },
{ 38400, B38400 },
{ 19200, B19200 },
{ 9600, B9600 },
{ 4800, B4800 },
{ 2400, B2400 },
{ 1200, B1200 },
{ 600, B600 },
{ 300, B300 },
{ 200, B200 },
{ 150, B150 },
{ 134, B134 },
{ 110, B110 },
{ 75, B75 },
{ 50, B50 },
{ 0, B9600 }
};
brate = C_BAUD(un->un_tty);
for (i = 0; baud_rates[i].rate; i++) {
if (baud_rates[i].cflag == brate)
break;
}
return baud_rates[i].rate;
}
static int calc_fastbaud_rate(struct un_struct *un, struct ktermios *uts)
{
int i;
int brate;
ulong bauds[2][16] = {
{ /* fastbaud*/
0, 57600, 76800, 115200,
131657, 153600, 230400, 460800,
921600, 1200, 1800, 2400,
4800, 9600, 19200, 38400 },
{ /* fastbaud & CBAUDEX */
0, 57600, 115200, 230400,
460800, 150, 200, 921600,
600, 1200, 1800, 2400,
4800, 9600, 19200, 38400 }
};
brate = C_BAUD(un->un_tty) & 0xff;
i = (uts->c_cflag & CBAUDEX) ? 1 : 0;
if ((i >= 0) && (i < 2) && (brate >= 0) && (brate < 16))
brate = bauds[i][brate];
else
brate = 0;
return brate;
}
/**
* drp_param() -- send parameter values to be sent to the node
* @ch: channel structure of port to modify
*
* Interprets the tty and modem changes made by an application
* program (by examining the termios structures) and sets up
* parameter values to be sent to the node.
*/
static void drp_param(struct ch_struct *ch)
{
struct nd_struct *nd;
struct un_struct *un;
int brate;
int mflow;
int xflag;
int iflag;
struct ktermios *tts, *pts, *uts;
nd = ch->ch_nd;
/*
* If the terminal device is open, use it to set up all tty
* modes and functions. Otherwise use the printer device.
*/
if (ch->ch_tun.un_open_count) {
un = &ch->ch_tun;
tts = &ch->ch_tun.un_tty->termios;
/*
* If both devices are open, copy critical line
* parameters from the tty device to the printer,
* so that if the tty is closed, the printer will
* continue without disruption.
*/
if (ch->ch_pun.un_open_count) {
pts = &ch->ch_pun.un_tty->termios;
pts->c_cflag ^=
(pts->c_cflag ^ tts->c_cflag) &
(CBAUD | CSIZE | CSTOPB | CREAD | PARENB |
PARODD | HUPCL | CLOCAL);
pts->c_iflag ^=
(pts->c_iflag ^ tts->c_iflag) &
(IGNBRK | BRKINT | IGNPAR | PARMRK | INPCK |
ISTRIP | IXON | IXANY | IXOFF);
pts->c_cc[VSTART] = tts->c_cc[VSTART];
pts->c_cc[VSTOP] = tts->c_cc[VSTOP];
}
} else if (ch->ch_pun.un_open_count == 0) {
pr_warn("%s - ch_pun.un_open_count shouldn't be 0\n",
__func__);
return;
} else {
un = &ch->ch_pun;
}
uts = &un->un_tty->termios;
/*
* Determine if FAST writes can be performed.
*/
if ((ch->ch_digi.digi_flags & DIGI_COOK) != 0 &&
(ch->ch_tun.un_open_count != 0) &&
!((un->un_tty)->ldisc->ops->flags & LDISC_FLAG_DEFINED) &&
!(L_XCASE(un->un_tty))) {
ch->ch_flag |= CH_FAST_WRITE;
} else {
ch->ch_flag &= ~CH_FAST_WRITE;
}
/*
* If FAST writes can be performed, and OPOST is on in the
* terminal device, do OPOST handling in the server.
*/
if ((ch->ch_flag & CH_FAST_WRITE) &&
O_OPOST(un->un_tty) != 0) {
int oflag = tty_to_ch_flags(un->un_tty, 'o');
/* add to ch_ocook any processing flags set in the termio */
ch->ch_ocook |= oflag & (OF_OLCUC |
OF_ONLCR |
OF_OCRNL |
OF_ONLRET |
OF_TABDLY);
/*
* the hpux driver clears any flags set in ch_ocook
* from the termios oflag. It is STILL reported though
* by a TCGETA
*/
oflag = ch_to_tty_flags(ch->ch_ocook, 'o');
uts->c_oflag &= ~oflag;
} else {
/* clear the ch->ch_ocook flag */
int oflag = ch_to_tty_flags(ch->ch_ocook, 'o');
uts->c_oflag |= oflag;
ch->ch_ocook = 0;
}
ch->ch_oflag = ch->ch_ocook;
ch->ch_flag &= ~CH_FAST_READ;
/*
* Generate channel flags
*/
if (C_BAUD(un->un_tty) == B0) {
if (!(ch->ch_flag & CH_BAUD0)) {
/* TODO : the HPUX driver flushes line */
/* TODO : discipline, I assume I don't have to */
ch->ch_tout = ch->ch_tin;
ch->ch_rout = ch->ch_rin;
ch->ch_break_time = 0;
ch->ch_send |= RR_TX_FLUSH | RR_RX_FLUSH;
ch->ch_mout &= ~(DM_DTR | DM_RTS);
ch->ch_flag |= CH_BAUD0;
}
} else if (ch->ch_custom_speed) {
ch->ch_brate = PORTSERVER_DIVIDEND / ch->ch_custom_speed;
if (ch->ch_flag & CH_BAUD0) {
ch->ch_mout |= DM_DTR | DM_RTS;
ch->ch_flag &= ~CH_BAUD0;
}
} else {
/*
* Baud rate mapping.
*
* If FASTBAUD isn't on, we can scan the new baud rate list
* as required.
*
* However, if FASTBAUD is on, we must go to the old
* baud rate mapping that existed many many moons ago,
* for compatibility reasons.
*/
if (!(ch->ch_digi.digi_flags & DIGI_FAST))
brate = calc_baud_rate(un);
else
brate = calc_fastbaud_rate(un, uts);
if (brate == 0)
brate = 9600;
ch->ch_brate = PORTSERVER_DIVIDEND / brate;
if (ch->ch_flag & CH_BAUD0) {
ch->ch_mout |= DM_DTR | DM_RTS;
ch->ch_flag &= ~CH_BAUD0;
}
}
/*
* Generate channel cflags from the termio.
*/
ch->ch_cflag = tty_to_ch_flags(un->un_tty, 'c');
/*
* Generate channel iflags from the termio.
*/
iflag = (int) tty_to_ch_flags(un->un_tty, 'i');
if (START_CHAR(un->un_tty) == _POSIX_VDISABLE ||
STOP_CHAR(un->un_tty) == _POSIX_VDISABLE) {
iflag &= ~(IF_IXON | IF_IXANY | IF_IXOFF);
}
ch->ch_iflag = iflag;
/*
* Generate flow control characters
*/
/*
* From the POSIX.1 spec (7.1.2.6): "If {_POSIX_VDISABLE}
* is defined for the terminal device file, and the value
* of one of the changeable special control characters (see
* 7.1.1.9) is {_POSIX_VDISABLE}, that function shall be
* disabled, that is, no input data shall be recognized as
* the disabled special character."
*
* OK, so we don't ever assign S/DXB XON or XOFF to _POSIX_VDISABLE.
*/
if (uts->c_cc[VSTART] != _POSIX_VDISABLE)
ch->ch_xon = uts->c_cc[VSTART];
if (uts->c_cc[VSTOP] != _POSIX_VDISABLE)
ch->ch_xoff = uts->c_cc[VSTOP];
ch->ch_lnext = (uts->c_cc[VLNEXT] == _POSIX_VDISABLE ? 0 :
uts->c_cc[VLNEXT]);
/*
* Also, if either c_cc[START] or c_cc[STOP] is set to
* _POSIX_VDISABLE, we can't really do software flow
* control--in either direction--so we turn it off as
* far as S/DXB is concerned. In essence, if you disable
* one, you disable the other too.
*/
if ((uts->c_cc[VSTART] == _POSIX_VDISABLE) ||
(uts->c_cc[VSTOP] == _POSIX_VDISABLE))
ch->ch_iflag &= ~(IF_IXOFF | IF_IXON);
/*
* Update xflags.
*/
xflag = 0;
if (ch->ch_digi.digi_flags & DIGI_AIXON)
xflag = XF_XIXON;
if ((ch->ch_xxon == _POSIX_VDISABLE) ||
(ch->ch_xxoff == _POSIX_VDISABLE))
xflag &= ~XF_XIXON;
ch->ch_xflag = xflag;
/*
* Figure effective DCD value.
*/
if (C_CLOCAL(un->un_tty))
ch->ch_flag |= CH_CLOCAL;
else
ch->ch_flag &= ~CH_CLOCAL;
/*
* Check modem signals
*/
dgrp_carrier(ch);
/*
* Get hardware handshake value.
*/
mflow = 0;
if (C_CRTSCTS(un->un_tty))
mflow |= (DM_RTS | DM_CTS);
if (ch->ch_digi.digi_flags & RTSPACE)
mflow |= DM_RTS;
if (ch->ch_digi.digi_flags & DTRPACE)
mflow |= DM_DTR;
if (ch->ch_digi.digi_flags & CTSPACE)
mflow |= DM_CTS;
if (ch->ch_digi.digi_flags & DSRPACE)
mflow |= DM_DSR;
if (ch->ch_digi.digi_flags & DCDPACE)
mflow |= DM_CD;
if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE)
mflow |= DM_RTS_TOGGLE;
ch->ch_mflow = mflow;
/*
* Send the changes to the server.
*/
ch->ch_flag |= CH_PARAM;
(ch->ch_nd)->nd_tx_work = 1;
if (waitqueue_active(&ch->ch_flag_wait))
wake_up_interruptible(&ch->ch_flag_wait);
}
/*
* This function is just used as a callback for timeouts
* waiting on the ch_sleep flag.
*/
static void wake_up_drp_sleep_timer(unsigned long ptr)
{
struct ch_struct *ch = (struct ch_struct *) ptr;
if (ch)
wake_up(&ch->ch_sleep);
}
/*
* Set up our own sleep that can't be cancelled
* until our timeout occurs.
*/
static void drp_my_sleep(struct ch_struct *ch)
{
struct timer_list drp_wakeup_timer;
DECLARE_WAITQUEUE(wait, current);
/*
* First make sure we're ready to receive the wakeup.
*/
add_wait_queue(&ch->ch_sleep, &wait);
current->state = TASK_UNINTERRUPTIBLE;
/*
* Since we are uninterruptible, set a timer to
* unset the uninterruptable state in 1 second.
*/
init_timer(&drp_wakeup_timer);
drp_wakeup_timer.function = wake_up_drp_sleep_timer;
drp_wakeup_timer.data = (unsigned long) ch;
drp_wakeup_timer.expires = jiffies + (1 * HZ);
add_timer(&drp_wakeup_timer);
schedule();
del_timer(&drp_wakeup_timer);
remove_wait_queue(&ch->ch_sleep, &wait);
}
/*
* dgrp_tty_open()
*
* returns:
* -EBUSY - this is a callout device and the normal device is active
* - there is an error in opening the tty
* -ENODEV - the channel does not exist
* -EAGAIN - we are in the middle of hanging up or closing
* - IMMEDIATE_OPEN fails
* -ENXIO or -EAGAIN
* - if the port is outside physical range
* -EINTR - the open is interrupted
*
*/
static int dgrp_tty_open(struct tty_struct *tty, struct file *file)
{
int retval = 0;
struct nd_struct *nd;
struct ch_struct *ch;
struct un_struct *un;
int port;
int delay_error;
int otype;
int unf;
int wait_carrier;
int category;
int counts_were_incremented = 0;
ulong lock_flags;
DECLARE_WAITQUEUE(wait, current);
/*
* Do some initial checks to see if the node and port exist
*/
nd = nd_struct_get(MAJOR(tty_devnum(tty)));
port = PORT_NUM(MINOR(tty_devnum(tty)));
category = OPEN_CATEGORY(MINOR(tty_devnum(tty)));
if (!nd)
return -ENODEV;
if (port >= CHAN_MAX)
return -ENODEV;
/*
* The channel exists.
*/
ch = nd->nd_chan + port;
un = IS_PRINT(MINOR(tty_devnum(tty))) ? &ch->ch_pun : &ch->ch_tun;
un->un_tty = tty;
tty->driver_data = un;
/*
* If we are in the middle of hanging up,
* then return an error
*/
if (tty_hung_up_p(file)) {
retval = ((un->un_flag & UN_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS);
goto done;
}
/*
* If the port is in the middle of closing, then block
* until it is done, then try again.
*/
retval = wait_event_interruptible(un->un_close_wait,
((un->un_flag & UN_CLOSING) == 0));
if (retval)
goto done;
/*
* If the port is in the middle of a reopen after a network disconnect,
* wait until it is done, then try again.
*/
retval = wait_event_interruptible(ch->ch_flag_wait,
((ch->ch_flag & CH_PORT_GONE) == 0));
if (retval)
goto done;
/*
* If this is a callout device, then just make sure the normal
* device isn't being used.
*/
if (tty->driver->subtype == SERIAL_TYPE_CALLOUT) {
if (un->un_flag & UN_NORMAL_ACTIVE) {
retval = -EBUSY;
goto done;
} else {
un->un_flag |= UN_CALLOUT_ACTIVE;
}
}
/*
* Loop waiting until the open can be successfully completed.
*/
spin_lock_irqsave(&nd->nd_lock, lock_flags);
nd->nd_tx_work = 1;
for (;;) {
wait_carrier = 0;
/*
* Determine the open type from the flags provided.
*/
/*
* If the port is not enabled, then exit
*/
if (test_bit(TTY_IO_ERROR, &tty->flags)) {
/* there was an error in opening the tty */
if (un->un_flag & UN_CALLOUT_ACTIVE)
retval = -EBUSY;
else
un->un_flag |= UN_NORMAL_ACTIVE;
goto unlock;
}
if (file->f_flags & O_NONBLOCK) {
/*
* if the O_NONBLOCK is set, errors on read and write
* must return -EAGAIN immediately and NOT sleep
* on the waitqs.
*/
otype = OTYPE_IMMEDIATE;
delay_error = -EAGAIN;
} else if (!OPEN_WAIT_AVAIL(category) ||
(file->f_flags & O_NDELAY) != 0) {
otype = OTYPE_IMMEDIATE;
delay_error = -EBUSY;
} else if (!OPEN_WAIT_CARRIER(category) ||
((ch->ch_digi.digi_flags & DIGI_FORCEDCD) != 0) ||
C_CLOCAL(tty)) {
otype = OTYPE_PERSISTENT;
delay_error = 0;
} else {
otype = OTYPE_INCOMING;
delay_error = 0;
}
/*
* Handle port currently outside physical port range.
*/
if (port >= nd->nd_chan_count) {
if (otype == OTYPE_IMMEDIATE) {
retval = (nd->nd_state == NS_READY) ?
-ENXIO : -EAGAIN;
goto unlock;
}
}
/*
* Handle port not currently open.
*/
else if (ch->ch_open_count == 0) {
/*
* Return an error when an Incoming Open
* response indicates the port is busy.
*/
if (ch->ch_open_error != 0 && otype == ch->ch_otype) {
retval = (ch->ch_open_error <= 2) ?
delay_error : -ENXIO;
goto unlock;
}
/*
* Fail any new Immediate open if we do not have
* a normal connection to the server.
*/
if (nd->nd_state != NS_READY &&
otype == OTYPE_IMMEDIATE) {
retval = -EAGAIN;
goto unlock;
}
/*
* If a Realport open of the correct type has
* succeeded, complete the open.
*/
if (ch->ch_state == CS_READY && ch->ch_otype == otype)
break;
}
/*
* Handle port already open and active as a device
* of same category.
*/
else if ((ch->ch_category == category) ||
IS_PRINT(MINOR(tty_devnum(tty)))) {
/*
* Fail if opening the device now would
* violate exclusive use.
*/
unf = ch->ch_tun.un_flag | ch->ch_pun.un_flag;
if ((file->f_flags & O_EXCL) || (unf & UN_EXCL)) {
retval = -EBUSY;
goto unlock;
}
/*
* If the open device is in the hangup state, all
* system calls fail except close().
*/
/* TODO : check on hangup_p calls */
if (ch->ch_flag & CH_HANGUP) {
retval = -ENXIO;
goto unlock;
}
/*
* If the port is ready, and carrier is ignored
* or present, then complete the open.
*/
if (ch->ch_state == CS_READY &&
(otype != OTYPE_INCOMING ||
ch->ch_flag & CH_VIRT_CD))
break;
wait_carrier = 1;
}
/*
* Handle port active with a different category device.
*/
else {
if (otype == OTYPE_IMMEDIATE) {
retval = delay_error;
goto unlock;
}
}
/*
* Wait until conditions change, then take another
* try at the open.
*/
ch->ch_wait_count[otype]++;
if (wait_carrier)
ch->ch_wait_carrier++;
/*
* Prepare the task to accept the wakeup, then
* release our locks and release control.
*/
add_wait_queue(&ch->ch_flag_wait, &wait);
current->state = TASK_INTERRUPTIBLE;
spin_unlock_irqrestore(&nd->nd_lock, lock_flags);
/*
* Give up control, we'll come back if we're
* interrupted or are woken up.
*/
schedule();
remove_wait_queue(&ch->ch_flag_wait, &wait);
spin_lock_irqsave(&nd->nd_lock, lock_flags);
current->state = TASK_RUNNING;
ch->ch_wait_count[otype]--;
if (wait_carrier)
ch->ch_wait_carrier--;
nd->nd_tx_work = 1;
if (signal_pending(current)) {
retval = -EINTR;
goto unlock;
}
} /* end for(;;) */
/*
* The open has succeeded. No turning back.
*/
counts_were_incremented = 1;
un->un_open_count++;
ch->ch_open_count++;
/*
* Initialize the channel, if it's not already open.
*/
if (ch->ch_open_count == 1) {
ch->ch_flag = 0;
ch->ch_inwait = 0;
ch->ch_category = category;
ch->ch_pscan_state = 0;
/* TODO : find out what PS-1 bug Gene was referring to */
/* TODO : in the following comment. */
ch->ch_send = RR_TX_START | RR_RX_START; /* PS-1 bug */
if (C_CLOCAL(tty) ||
ch->ch_s_mlast & DM_CD ||
ch->ch_digi.digi_flags & DIGI_FORCEDCD)
ch->ch_flag |= CH_VIRT_CD;
else if (OPEN_FORCES_CARRIER(category))
ch->ch_flag |= CH_VIRT_CD;
}
/*
* Initialize the unit, if it is not already open.
*/
if (un->un_open_count == 1) {
/*
* Since all terminal options are always sticky in Linux,
* we don't need the UN_STICKY flag to be handled specially.
*/
/* clears all the digi flags, leaves serial flags */
un->un_flag &= ~UN_DIGI_MASK;
if (file->f_flags & O_EXCL)
un->un_flag |= UN_EXCL;
/* TODO : include "session" and "pgrp" */
/*
* In Linux, all terminal parameters are intended to be sticky.
* as a result, we "remove" the code which once reset the ports
* to sane values.
*/
drp_param(ch);
}
un->un_flag |= UN_INITIALIZED;
retval = 0;
unlock:
spin_unlock_irqrestore(&nd->nd_lock, lock_flags);
done:
/*
* Linux does a close for every open, even failed ones!
*/
if (!counts_were_incremented) {
un->un_open_count++;
ch->ch_open_count++;
}
if (retval)
dev_err(tty->dev, "tty open bad return (%i)\n", retval);
return retval;
}
/*
* dgrp_tty_close() -- close function for tty_operations
*/
static void dgrp_tty_close(struct tty_struct *tty, struct file *file)
{
struct ch_struct *ch;
struct un_struct *un;
struct nd_struct *nd;
int tpos;
int port;
int err = 0;
int s = 0;
ulong waketime;
ulong lock_flags;
int sent_printer_offstr = 0;
port = PORT_NUM(MINOR(tty_devnum(tty)));
un = tty->driver_data;
if (!un)
return;
ch = un->un_ch;
if (!ch)
return;
nd = ch->ch_nd;
if (!nd)
return;
spin_lock_irqsave(&nd->nd_lock, lock_flags);
/* Used to be on channel basis, now we check on a unit basis. */
if (un->un_open_count != 1)
goto unlock;
/*
* OK, its the last close on the unit
*/
un->un_flag |= UN_CLOSING;
/*
* Notify the discipline to only process XON/XOFF characters.
*/
tty->closing = 1;
/*
* Wait for output to drain only if this is
* the last close against the channel
*/
if (ch->ch_open_count == 1) {
/*
* If its the print device, we need to ensure at all costs that
* the offstr will fit. If it won't, flush our tbuf.
*/
if (IS_PRINT(MINOR(tty_devnum(tty))) &&
(((ch->ch_tout - ch->ch_tin - 1) & TBUF_MASK) <
ch->ch_digi.digi_offlen))
ch->ch_tin = ch->ch_tout;
/*
* Turn off the printer. Don't bother checking to see if its
* IS_PRINT... Since this is the last close the flag is going
* to be cleared, so we MUST make sure the offstr gets inserted
* into tbuf.
*/
if ((ch->ch_flag & CH_PRON) != 0) {
drp_wmove(ch, 0, ch->ch_digi.digi_offstr,
ch->ch_digi.digi_offlen);
ch->ch_flag &= ~CH_PRON;
sent_printer_offstr = 1;
}
}
/*
* Wait until either the output queue has drained, or we see
* absolutely no progress for 15 seconds.
*/
tpos = ch->ch_s_tpos;
waketime = jiffies + 15 * HZ;
for (;;) {
/*
* Make sure the port still exists.
*/
if (port >= nd->nd_chan_count) {
err = 1;
break;
}
if (signal_pending(current)) {
err = 1;
break;
}
/*
* If the port is idle (not opened on the server), we have
* no way of draining/flushing/closing the port on that server.
* So break out of loop.
*/
if (ch->ch_state == CS_IDLE)
break;
nd->nd_tx_work = 1;
/*
* Exit if the queues for this unit are empty,
* and either the other unit is still open or all
* data has drained.
*/
if ((un->un_tty)->ops->chars_in_buffer ?
((un->un_tty)->ops->chars_in_buffer)(un->un_tty) == 0 : 1) {
/*
* We don't need to wait for a buffer to drain
* if the other unit is open.
*/
if (ch->ch_open_count != un->un_open_count)
break;
/*
* The wait is complete when all queues are
* drained, and any break in progress is complete.
*/
if (ch->ch_tin == ch->ch_tout &&
ch->ch_s_tin == ch->ch_s_tpos &&
(ch->ch_send & RR_TX_BREAK) == 0) {
break;
}
}
/*
* Flush TX data and exit the wait if NDELAY is set,
* or this is not a DIGI printer, and the close timeout
* expires.
*/
if ((file->f_flags & (O_NDELAY | O_NONBLOCK)) ||
((long)(jiffies - waketime) >= 0 &&
(ch->ch_digi.digi_flags & DIGI_PRINTER) == 0)) {
/*
* If we sent the printer off string, we cannot
* flush our internal buffers, or we might lose
* the offstr.
*/
if (!sent_printer_offstr)
dgrp_tty_flush_buffer(tty);
spin_unlock_irqrestore(&nd->nd_lock, lock_flags);
tty_ldisc_flush(tty);
spin_lock_irqsave(&nd->nd_lock, lock_flags);
break;
}
/*
* Otherwise take a short nap.
*/
ch->ch_flag |= CH_DRAIN;
spin_unlock_irqrestore(&nd->nd_lock, lock_flags);
schedule_timeout_interruptible(1);
s = signal_pending(current);
spin_lock_irqsave(&nd->nd_lock, lock_flags);
if (s) {
/*
* If we had sent the printer off string, we now have
* some problems.
*
* The system won't let us sleep since we got an error
* back from sleep, presumably because the user did
* a ctrl-c...
* But we need to ensure that the offstr gets sent!
* Thus, we have to do something else besides sleeping.
* The plan:
* 1) Make this task uninterruptable.
* 2) Set up a timer to go off in 1 sec.
* 3) Act as tho we just got out of the sleep above.
*
* Thankfully, in the real world, this just
* never happens.
*/
if (sent_printer_offstr) {
spin_unlock_irqrestore(&nd->nd_lock,
lock_flags);
drp_my_sleep(ch);
spin_lock_irqsave(&nd->nd_lock, lock_flags);
} else {
err = 1;
break;
}
}
/*
* Restart the wait if any progress is seen.
*/
if (ch->ch_s_tpos != tpos) {
tpos = ch->ch_s_tpos;
/* TODO: this gives us timeout problems with nist ?? */
waketime = jiffies + 15 * HZ;
}
}
/*
* Close the line discipline
*/
/* this is done in tty_io.c */
/* if ((un->un_tty)->ldisc.close)
* ((un->un_tty)->ldisc.close)(un->un_tty);
*/
/* don't do this here */
/* un->un_flag = 0; */
/*
* Flush the receive buffer on terminal unit close only.
*/
if (!IS_PRINT(MINOR(tty_devnum(tty))))
ch->ch_rout = ch->ch_rin;
/*
* Don't permit the close to happen until we get any pending
* sync request responses.
* There could be other ports depending upon the response as well.
*
* Also, don't permit the close to happen until any parameter
* changes have been sent out from the state machine as well.
* This is required because of a ditty -a race with -HUPCL
* We MUST make sure all channel parameters have been sent to the
* Portserver before sending a close.
*/
if ((err != 1) && (ch->ch_state != CS_IDLE)) {
spin_unlock_irqrestore(&nd->nd_lock, lock_flags);
s = wait_event_interruptible(ch->ch_flag_wait,
((ch->ch_flag & (CH_WAITING_SYNC | CH_PARAM)) == 0));
spin_lock_irqsave(&nd->nd_lock, lock_flags);
}
/*
* Cleanup the channel if last unit open.
*/
if (ch->ch_open_count == 1) {
ch->ch_flag = 0;
ch->ch_category = 0;
ch->ch_send = 0;
ch->ch_expect = 0;
ch->ch_tout = ch->ch_tin;
/* (un->un_tty)->device = 0; */
if (ch->ch_state == CS_READY)
ch->ch_state = CS_SEND_CLOSE;
}
/*
* Send the changes to the server
*/
if (ch->ch_state != CS_IDLE) {
ch->ch_flag |= CH_PARAM;
wake_up_interruptible(&ch->ch_flag_wait);
}
nd->nd_tx_work = 1;
nd->nd_tx_ready = 1;
unlock:
tty->closing = 0;
if (ch->ch_open_count <= 0)
dev_info(tty->dev,
"%s - unexpected value for ch->ch_open_count: %i\n",
__func__, ch->ch_open_count);
else
ch->ch_open_count--;
if (un->un_open_count <= 0)
dev_info(tty->dev,
"%s - unexpected value for un->un_open_count: %i\n",
__func__, un->un_open_count);
else
un->un_open_count--;
un->un_flag &= ~(UN_NORMAL_ACTIVE | UN_CALLOUT_ACTIVE | UN_CLOSING);
if (waitqueue_active(&un->un_close_wait))
wake_up_interruptible(&un->un_close_wait);
spin_unlock_irqrestore(&nd->nd_lock, lock_flags);
return;
}
static void drp_wmove(struct ch_struct *ch, int from_user, void *buf, int count)
{
int n;
int ret = 0;
ch->ch_nd->nd_tx_work = 1;
n = TBUF_MAX - ch->ch_tin;
if (count >= n) {
if (from_user)
ret = copy_from_user(ch->ch_tbuf + ch->ch_tin,
(void __user *) buf, n);
else
memcpy(ch->ch_tbuf + ch->ch_tin, buf, n);
buf = (char *) buf + n;
count -= n;
ch->ch_tin = 0;
}
if (from_user)
ret = copy_from_user(ch->ch_tbuf + ch->ch_tin,
(void __user *) buf, count);
else
memcpy(ch->ch_tbuf + ch->ch_tin, buf, count);
ch->ch_tin += count;
}
static int dgrp_calculate_txprint_bounds(struct ch_struct *ch, int space,
int *un_flag)
{
clock_t tt;
clock_t mt;
unsigned short tmax = 0;
/*
* If the terminal device is busy, reschedule when
* the terminal device becomes idle.
*/
if (ch->ch_tun.un_open_count != 0 &&
ch->ch_tun.un_tty->ops->chars_in_buffer &&
((ch->ch_tun.un_tty->ops->chars_in_buffer)(ch->ch_tun.un_tty) != 0)) {
*un_flag = UN_PWAIT;
return 0;
}
/*
* Assure that whenever there is printer data in the output
* buffer, there always remains enough space after it to
* turn the printer off.
*/
space -= ch->ch_digi.digi_offlen;
if (space <= 0) {
*un_flag = UN_EMPTY;
return 0;
}
/*
* We measure printer CPS speed by incrementing
* ch_cpstime by (HZ / digi_maxcps) for every
* character we output, restricting output so
* that ch_cpstime never exceeds lbolt.
*
* However if output has not been done for some
* time, lbolt will grow to very much larger than
* ch_cpstime, which would allow essentially
* unlimited amounts of output until ch_cpstime
* finally caught up. To avoid this, we adjust
* cps_time when necessary so the difference
* between lbolt and ch_cpstime never results
* in sending more than digi_bufsize characters.
*
* This nicely models a printer with an internal
* buffer of digi_bufsize characters.
*
* Get the time between lbolt and ch->ch_cpstime;
*/
tt = jiffies - ch->ch_cpstime;
/*
* Compute the time required to send digi_bufsize
* characters.
*/
mt = HZ * ch->ch_digi.digi_bufsize / ch->ch_digi.digi_maxcps;
/*
* Compute the number of characters that can be sent
* without violating the time constraint. If the
* direct calculation of this number is bigger than
* digi_bufsize, limit the number to digi_bufsize,
* and adjust cpstime to match.
*/
if ((clock_t)(tt + HZ) > (clock_t)(mt + HZ)) {
tmax = ch->ch_digi.digi_bufsize;
ch->ch_cpstime = jiffies - mt;
} else {
tmax = ch->ch_digi.digi_maxcps * tt / HZ;
}
/*
* If the time constraint now binds, limit the transmit
* count accordingly, and tentatively arrange to be
* rescheduled based on time.
*/
if (tmax < space) {
*un_flag = UN_TIME;
space = tmax;
}
/*
* Compute the total number of characters we can
* output before the total number of characters known
* to be in the output queue exceeds digi_maxchar.
*/
tmax = (ch->ch_digi.digi_maxchar -
((ch->ch_tin - ch->ch_tout) & TBUF_MASK) -
((ch->ch_s_tin - ch->ch_s_tpos) & 0xffff));
/*
* If the digi_maxchar constraint now holds, limit
* the transmit count accordingly, and arrange to
* be rescheduled when the queue becomes empty.
*/
if (space > tmax) {
*un_flag = UN_EMPTY;
space = tmax;
}
if (space <= 0)
*un_flag |= UN_EMPTY;
return space;
}
static int dgrp_tty_write(struct tty_struct *tty,
const unsigned char *buf,
int count)
{
struct nd_struct *nd;
struct un_struct *un;
struct ch_struct *ch;
int space;
int n;
int t;
int sendcount;
int un_flag;
ulong lock_flags;
if (tty == NULL)
return 0;
un = tty->driver_data;
if (!un)
return 0;
ch = un->un_ch;
if (!ch)
return 0;
nd = ch->ch_nd;
if (!nd)
return 0;
/*
* Ignore the request if the channel is not ready.
*/
if (ch->ch_state != CS_READY)
return 0;
spin_lock_irqsave(&dgrp_poll_data.poll_lock, lock_flags);
/*
* Ignore the request if output is blocked.
*/
if ((un->un_flag & (UN_EMPTY | UN_LOW | UN_TIME | UN_PWAIT)) != 0) {
count = 0;
goto out;
}
/*
* Also ignore the request if DPA has this port open,
* and is flow controlled on reading more data.
*/
if (nd->nd_dpa_debug && nd->nd_dpa_flag & DPA_WAIT_SPACE &&
nd->nd_dpa_port == MINOR(tty_devnum(ch->ch_tun.un_tty))) {
count = 0;
goto out;
}
/*
* Limit amount we will write to the amount of space
* available in the channel buffer.
*/
sendcount = 0;
space = (ch->ch_tout - ch->ch_tin - 1) & TBUF_MASK;
/*
* Handle the printer device.
*/
un_flag = UN_LOW;
if (IS_PRINT(MINOR(tty_devnum(tty)))) {
clock_t tt;
clock_t mt;
unsigned short tmax = 0;
/*
* If the terminal device is busy, reschedule when
* the terminal device becomes idle.
*/
if (ch->ch_tun.un_open_count != 0 &&
((ch->ch_tun.un_tty->ops->chars_in_buffer)(ch->ch_tun.un_tty) != 0)) {
un->un_flag |= UN_PWAIT;
count = 0;
goto out;
}
/*
* Assure that whenever there is printer data in the output
* buffer, there always remains enough space after it to
* turn the printer off.
*/
space -= ch->ch_digi.digi_offlen;
/*
* Output the printer on string.
*/
if ((ch->ch_flag & CH_PRON) == 0) {
space -= ch->ch_digi.digi_onlen;
if (space < 0) {
un->un_flag |= UN_EMPTY;
(ch->ch_nd)->nd_tx_work = 1;
count = 0;
goto out;
}
drp_wmove(ch, 0, ch->ch_digi.digi_onstr,
ch->ch_digi.digi_onlen);
ch->ch_flag |= CH_PRON;
}
/*
* We measure printer CPS speed by incrementing
* ch_cpstime by (HZ / digi_maxcps) for every
* character we output, restricting output so
* that ch_cpstime never exceeds lbolt.
*
* However if output has not been done for some
* time, lbolt will grow to very much larger than
* ch_cpstime, which would allow essentially
* unlimited amounts of output until ch_cpstime
* finally caught up. To avoid this, we adjust
* cps_time when necessary so the difference
* between lbolt and ch_cpstime never results
* in sending more than digi_bufsize characters.
*
* This nicely models a printer with an internal
* buffer of digi_bufsize characters.
*
* Get the time between lbolt and ch->ch_cpstime;
*/
tt = jiffies - ch->ch_cpstime;
/*
* Compute the time required to send digi_bufsize
* characters.
*/
mt = HZ * ch->ch_digi.digi_bufsize / ch->ch_digi.digi_maxcps;
/*
* Compute the number of characters that can be sent
* without violating the time constraint. If the
* direct calculation of this number is bigger than
* digi_bufsize, limit the number to digi_bufsize,
* and adjust cpstime to match.
*/
if ((clock_t)(tt + HZ) > (clock_t)(mt + HZ)) {
tmax = ch->ch_digi.digi_bufsize;
ch->ch_cpstime = jiffies - mt;
} else {
tmax = ch->ch_digi.digi_maxcps * tt / HZ;
}
/*
* If the time constraint now binds, limit the transmit
* count accordingly, and tentatively arrange to be
* rescheduled based on time.
*/
if (tmax < space) {
space = tmax;
un_flag = UN_TIME;
}
/*
* Compute the total number of characters we can
* output before the total number of characters known
* to be in the output queue exceeds digi_maxchar.
*/
tmax = (ch->ch_digi.digi_maxchar -
((ch->ch_tin - ch->ch_tout) & TBUF_MASK) -
((ch->ch_s_tin - ch->ch_s_tpos) & 0xffff));
/*
* If the digi_maxchar constraint now holds, limit
* the transmit count accordingly, and arrange to
* be rescheduled when the queue becomes empty.
*/
if (space > tmax) {
space = tmax;
un_flag = UN_EMPTY;
}
}
/*
* Handle the terminal device.
*/
else {
/*
* If the printer device is on, turn it off.
*/
if ((ch->ch_flag & CH_PRON) != 0) {
space -= ch->ch_digi.digi_offlen;
drp_wmove(ch, 0, ch->ch_digi.digi_offstr,
ch->ch_digi.digi_offlen);
ch->ch_flag &= ~CH_PRON;
}
}
/*
* If space is 0 and its because the ch->tbuf
* is full, then Linux will handle a callback when queue
* space becomes available.
* tty_write returns count = 0
*/
if (space <= 0) {
/* the linux tty_io.c handles this if we return 0 */
/* if (fp->flags & O_NONBLOCK) return -EAGAIN; */
un->un_flag |= UN_EMPTY;
(ch->ch_nd)->nd_tx_work = 1;
count = 0;
goto out;
}
count = min(count, space);
if (count > 0) {
un->un_tbusy++;
/*
* Copy the buffer contents to the ch_tbuf
* being careful to wrap around the circular queue
*/
t = TBUF_MAX - ch->ch_tin;
n = count;
if (n >= t) {
memcpy(ch->ch_tbuf + ch->ch_tin, buf, t);
if (nd->nd_dpa_debug && nd->nd_dpa_port == PORT_NUM(MINOR(tty_devnum(un->un_tty))))
dgrp_dpa_data(nd, 0, (char *) buf, t);
buf += t;
n -= t;
ch->ch_tin = 0;
sendcount += n;
}
memcpy(ch->ch_tbuf + ch->ch_tin, buf, n);
if (nd->nd_dpa_debug && nd->nd_dpa_port == PORT_NUM(MINOR(tty_devnum(un->un_tty))))
dgrp_dpa_data(nd, 0, (char *) buf, n);
buf += n;
ch->ch_tin += n;
sendcount += n;
un->un_tbusy--;
(ch->ch_nd)->nd_tx_work = 1;
if (ch->ch_edelay != DGRP_RTIME) {
(ch->ch_nd)->nd_tx_ready = 1;
wake_up_interruptible(&nd->nd_tx_waitq);
}
}
ch->ch_txcount += count;
if (IS_PRINT(MINOR(tty_devnum(tty)))) {
/*
* Adjust ch_cpstime to account
* for the characters just output.
*/
if (sendcount > 0) {
int cc = HZ * sendcount + ch->ch_cpsrem;
ch->ch_cpstime += cc / ch->ch_digi.digi_maxcps;
ch->ch_cpsrem = cc % ch->ch_digi.digi_maxcps;
}
/*
* If we are now waiting on time, schedule ourself
* back when we'll be able to send a block of
* digi_maxchar characters.
*/
if ((un_flag & UN_TIME) != 0) {
ch->ch_waketime = (ch->ch_cpstime +
(ch->ch_digi.digi_maxchar * HZ /
ch->ch_digi.digi_maxcps));
}
}
/*
* If the printer unit is waiting for completion
* of terminal output, get him going again.
*/
if ((ch->ch_pun.un_flag & UN_PWAIT) != 0)
(ch->ch_nd)->nd_tx_work = 1;
out:
spin_unlock_irqrestore(&dgrp_poll_data.poll_lock, lock_flags);
return count;
}
/*
* Put a character into ch->ch_buf
*
* - used by the line discipline for OPOST processing
*/
static int dgrp_tty_put_char(struct tty_struct *tty, unsigned char new_char)
{
struct un_struct *un;
struct ch_struct *ch;
ulong lock_flags;
int space;
int retval = 0;
if (tty == NULL)
return 0;
un = tty->driver_data;
if (!un)
return 0;
ch = un->un_ch;
if (!ch)
return 0;
if (ch->ch_state != CS_READY)
return 0;
spin_lock_irqsave(&dgrp_poll_data.poll_lock, lock_flags);
/*
* If space is 0 and its because the ch->tbuf
* Warn and dump the character, there isn't anything else
* we can do about it. David_Fries@digi.com
*/
space = (ch->ch_tout - ch->ch_tin - 1) & TBUF_MASK;
un->un_tbusy++;
/*
* Output the printer on string if device is TXPrint.
*/
if (IS_PRINT(MINOR(tty_devnum(tty))) && (ch->ch_flag & CH_PRON) == 0) {
if (space < ch->ch_digi.digi_onlen) {
un->un_tbusy--;
goto out;
}
space -= ch->ch_digi.digi_onlen;
drp_wmove(ch, 0, ch->ch_digi.digi_onstr,
ch->ch_digi.digi_onlen);
ch->ch_flag |= CH_PRON;
}
/*
* Output the printer off string if device is NOT TXPrint.
*/
if (!IS_PRINT(MINOR(tty_devnum(tty))) &&
((ch->ch_flag & CH_PRON) != 0)) {
if (space < ch->ch_digi.digi_offlen) {
un->un_tbusy--;
goto out;
}
space -= ch->ch_digi.digi_offlen;
drp_wmove(ch, 0, ch->ch_digi.digi_offstr,
ch->ch_digi.digi_offlen);
ch->ch_flag &= ~CH_PRON;
}
if (!space) {
un->un_tbusy--;
goto out;
}
/*
* Copy the character to the ch_tbuf being
* careful to wrap around the circular queue
*/
ch->ch_tbuf[ch->ch_tin] = new_char;
ch->ch_tin = (1 + ch->ch_tin) & TBUF_MASK;
if (IS_PRINT(MINOR(tty_devnum(tty)))) {
/*
* Adjust ch_cpstime to account
* for the character just output.
*/
int cc = HZ + ch->ch_cpsrem;
ch->ch_cpstime += cc / ch->ch_digi.digi_maxcps;
ch->ch_cpsrem = cc % ch->ch_digi.digi_maxcps;
/*
* If we are now waiting on time, schedule ourself
* back when we'll be able to send a block of
* digi_maxchar characters.
*/
ch->ch_waketime = (ch->ch_cpstime +
(ch->ch_digi.digi_maxchar * HZ /
ch->ch_digi.digi_maxcps));
}
un->un_tbusy--;
(ch->ch_nd)->nd_tx_work = 1;
retval = 1;
out:
spin_unlock_irqrestore(&dgrp_poll_data.poll_lock, lock_flags);
return retval;
}
/*
* Flush TX buffer (make in == out)
*
* check tty_ioctl.c -- this is called after TCOFLUSH
*/
static void dgrp_tty_flush_buffer(struct tty_struct *tty)
{
struct un_struct *un;
struct ch_struct *ch;
if (!tty)
return;
un = tty->driver_data;
if (!un)
return;
ch = un->un_ch;
if (!ch)
return;
ch->ch_tout = ch->ch_tin;
/* do NOT do this here! */
/* ch->ch_s_tpos = ch->ch_s_tin = 0; */
/* send the flush output command now */
ch->ch_send |= RR_TX_FLUSH;
(ch->ch_nd)->nd_tx_ready = 1;
(ch->ch_nd)->nd_tx_work = 1;
wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq);
if (waitqueue_active(&tty->write_wait))
wake_up_interruptible(&tty->write_wait);
tty_wakeup(tty);
}
/*
* Return space available in Tx buffer
* count = ( ch->ch_tout - ch->ch_tin ) mod (TBUF_MAX - 1)
*/
static int dgrp_tty_write_room(struct tty_struct *tty)
{
struct un_struct *un;
struct ch_struct *ch;
int count;
if (!tty)
return 0;
un = tty->driver_data;
if (!un)
return 0;
ch = un->un_ch;
if (!ch)
return 0;
count = (ch->ch_tout - ch->ch_tin - 1) & TBUF_MASK;
/* We *MUST* check this, and return 0 if the Printer Unit cannot
* take any more data within its time constraints... If we don't
* return 0 and the printer has hit it time constraint, the ld will
* call us back doing a put_char, which cannot be rejected!!!
*/
if (IS_PRINT(MINOR(tty_devnum(tty)))) {
int un_flag = 0;
count = dgrp_calculate_txprint_bounds(ch, count, &un_flag);
if (count <= 0)
count = 0;
ch->ch_pun.un_flag |= un_flag;
(ch->ch_nd)->nd_tx_work = 1;
}
return count;
}
/*
* Return number of characters that have not been transmitted yet.
* chars_in_buffer = ( ch->ch_tin - ch->ch_tout ) mod (TBUF_MAX - 1)
* + ( ch->ch_s_tin - ch->ch_s_tout ) mod (0xffff)
* = number of characters "in transit"
*
* Remember that sequence number math is always with a sixteen bit
* mask, not the TBUF_MASK.
*/
static int dgrp_tty_chars_in_buffer(struct tty_struct *tty)
{
struct un_struct *un;
struct ch_struct *ch;
int count;
int count1;
if (!tty)
return 0;
un = tty->driver_data;
if (!un)
return 0;
ch = un->un_ch;
if (!ch)
return 0;
count1 = count = (ch->ch_tin - ch->ch_tout) & TBUF_MASK;
count += (ch->ch_s_tin - ch->ch_s_tpos) & 0xffff;
/* one for tbuf, one for the PS */
/*
* If we are busy transmitting add 1
*/
count += un->un_tbusy;
return count;
}
/*****************************************************************************
*
* Helper applications for dgrp_tty_ioctl()
*
*****************************************************************************
*/
/**
* ch_to_tty_flags() -- convert channel flags to termio flags
* @ch_flag: Digi channel flags
* @flagtype: type of ch_flag (iflag, oflag or cflag)
*
* take the channel flags of the specified type and return the
* corresponding termio flag
*/
static tcflag_t ch_to_tty_flags(ushort ch_flag, char flagtype)
{
tcflag_t retval = 0;
switch (flagtype) {
case 'i':
retval = ((ch_flag & IF_IGNBRK) ? IGNBRK : 0)
| ((ch_flag & IF_BRKINT) ? BRKINT : 0)
| ((ch_flag & IF_IGNPAR) ? IGNPAR : 0)
| ((ch_flag & IF_PARMRK) ? PARMRK : 0)
| ((ch_flag & IF_INPCK) ? INPCK : 0)
| ((ch_flag & IF_ISTRIP) ? ISTRIP : 0)
| ((ch_flag & IF_IXON) ? IXON : 0)
| ((ch_flag & IF_IXANY) ? IXANY : 0)
| ((ch_flag & IF_IXOFF) ? IXOFF : 0);
break;
case 'o':
retval = ((ch_flag & OF_OLCUC) ? OLCUC : 0)
| ((ch_flag & OF_ONLCR) ? ONLCR : 0)
| ((ch_flag & OF_OCRNL) ? OCRNL : 0)
| ((ch_flag & OF_ONOCR) ? ONOCR : 0)
| ((ch_flag & OF_ONLRET) ? ONLRET : 0)
/* | ((ch_flag & OF_OTAB3) ? OFILL : 0) */
| ((ch_flag & OF_TABDLY) ? TABDLY : 0);
break;
case 'c':
retval = ((ch_flag & CF_CSTOPB) ? CSTOPB : 0)
| ((ch_flag & CF_CREAD) ? CREAD : 0)
| ((ch_flag & CF_PARENB) ? PARENB : 0)
| ((ch_flag & CF_PARODD) ? PARODD : 0)
| ((ch_flag & CF_HUPCL) ? HUPCL : 0);
switch (ch_flag & CF_CSIZE) {
case CF_CS5:
retval |= CS5;
break;
case CF_CS6:
retval |= CS6;
break;
case CF_CS7:
retval |= CS7;
break;
case CF_CS8:
retval |= CS8;
break;
default:
retval |= CS8;
break;
}
break;
case 'x':
break;
case 'l':
break;
default:
return 0;
}
return retval;
}
/**
* tty_to_ch_flags() -- convert termio flags to digi channel flags
* @tty: pointer to a TTY structure holding flag to be converted
* @flagtype: identifies which flag (iflags, oflags, or cflags) should
* be converted
*
* take the termio flag of the specified type and return the
* corresponding Digi version of the flags
*/
static ushort tty_to_ch_flags(struct tty_struct *tty, char flagtype)
{
ushort retval = 0;
tcflag_t tflag = 0;
switch (flagtype) {
case 'i':
tflag = tty->termios.c_iflag;
retval = (I_IGNBRK(tty) ? IF_IGNBRK : 0)
| (I_BRKINT(tty) ? IF_BRKINT : 0)
| (I_IGNPAR(tty) ? IF_IGNPAR : 0)
| (I_PARMRK(tty) ? IF_PARMRK : 0)
| (I_INPCK(tty) ? IF_INPCK : 0)
| (I_ISTRIP(tty) ? IF_ISTRIP : 0)
| (I_IXON(tty) ? IF_IXON : 0)
| (I_IXANY(tty) ? IF_IXANY : 0)
| (I_IXOFF(tty) ? IF_IXOFF : 0);
break;
case 'o':
tflag = tty->termios.c_oflag;
/*
* If OPOST is set, then do the post processing in the
* firmware by setting all the processing flags on.
* If ~OPOST, then make sure we are not doing any
* output processing!!
*/
if (!O_OPOST(tty))
retval = 0;
else
retval = (O_OLCUC(tty) ? OF_OLCUC : 0)
| (O_ONLCR(tty) ? OF_ONLCR : 0)
| (O_OCRNL(tty) ? OF_OCRNL : 0)
| (O_ONOCR(tty) ? OF_ONOCR : 0)
| (O_ONLRET(tty) ? OF_ONLRET : 0)
/* | (O_OFILL(tty) ? OF_TAB3 : 0) */
| (O_TABDLY(tty) ? OF_TABDLY : 0);
break;
case 'c':
tflag = tty->termios.c_cflag;
retval = (C_CSTOPB(tty) ? CF_CSTOPB : 0)
| (C_CREAD(tty) ? CF_CREAD : 0)
| (C_PARENB(tty) ? CF_PARENB : 0)
| (C_PARODD(tty) ? CF_PARODD : 0)
| (C_HUPCL(tty) ? CF_HUPCL : 0);
switch (C_CSIZE(tty)) {
case CS8:
retval |= CF_CS8;
break;
case CS7:
retval |= CF_CS7;
break;
case CS6:
retval |= CF_CS6;
break;
case CS5:
retval |= CF_CS5;
break;
default:
retval |= CF_CS8;
break;
}
break;
case 'x':
break;
case 'l':
break;
default:
return 0;
}
return retval;
}
static int dgrp_tty_send_break(struct tty_struct *tty, int msec)
{
struct un_struct *un;
struct ch_struct *ch;
int ret = -EIO;
if (!tty)
return ret;
un = tty->driver_data;
if (!un)
return ret;
ch = un->un_ch;
if (!ch)
return ret;
dgrp_send_break(ch, msec);
return 0;
}
/*
* This routine sends a break character out the serial port.
*
* duration is in 1/1000's of a second
*/
static int dgrp_send_break(struct ch_struct *ch, int msec)
{
ulong x;
wait_event_interruptible(ch->ch_flag_wait,
((ch->ch_flag & CH_TX_BREAK) == 0));
ch->ch_break_time += max(msec, 250);
ch->ch_send |= RR_TX_BREAK;
ch->ch_flag |= CH_TX_BREAK;
(ch->ch_nd)->nd_tx_work = 1;
x = (msec * HZ) / 1000;
wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq);
return 0;
}
/*
* Return modem signals to ld.
*/
static int dgrp_tty_tiocmget(struct tty_struct *tty)
{
unsigned int mlast;
struct un_struct *un = tty->driver_data;
struct ch_struct *ch;
if (!un)
return -ENODEV;
ch = un->un_ch;
if (!ch)
return -ENODEV;
mlast = ((ch->ch_s_mlast & ~(DM_RTS | DM_DTR)) |
(ch->ch_mout & (DM_RTS | DM_DTR)));
/* defined in /usr/include/asm/termios.h */
mlast = ((mlast & DM_RTS) ? TIOCM_RTS : 0)
| ((mlast & DM_DTR) ? TIOCM_DTR : 0)
| ((mlast & DM_CD) ? TIOCM_CAR : 0)
| ((mlast & DM_RI) ? TIOCM_RNG : 0)
| ((mlast & DM_DSR) ? TIOCM_DSR : 0)
| ((mlast & DM_CTS) ? TIOCM_CTS : 0);
return mlast;
}
/*
* Set modem lines
*/
static int dgrp_tty_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
ulong lock_flags;
struct un_struct *un = tty->driver_data;
struct ch_struct *ch;
if (!un)
return -ENODEV;
ch = un->un_ch;
if (!ch)
return -ENODEV;
if (set & TIOCM_RTS)
ch->ch_mout |= DM_RTS;
if (set & TIOCM_DTR)
ch->ch_mout |= DM_DTR;
if (clear & TIOCM_RTS)
ch->ch_mout &= ~(DM_RTS);
if (clear & TIOCM_DTR)
ch->ch_mout &= ~(DM_DTR);
spin_lock_irqsave(&(ch->ch_nd)->nd_lock, lock_flags);
ch->ch_flag |= CH_PARAM;
(ch->ch_nd)->nd_tx_work = 1;
wake_up_interruptible(&ch->ch_flag_wait);
spin_unlock_irqrestore(&(ch->ch_nd)->nd_lock, lock_flags);
return 0;
}
/*
* Get current modem status
*/
static int get_modem_info(struct ch_struct *ch, unsigned int *value)
{
unsigned int mlast;
mlast = ((ch->ch_s_mlast & ~(DM_RTS | DM_DTR)) |
(ch->ch_mout & (DM_RTS | DM_DTR)));
/* defined in /usr/include/asm/termios.h */
mlast = ((mlast & DM_RTS) ? TIOCM_RTS : 0)
| ((mlast & DM_DTR) ? TIOCM_DTR : 0)
| ((mlast & DM_CD) ? TIOCM_CAR : 0)
| ((mlast & DM_RI) ? TIOCM_RNG : 0)
| ((mlast & DM_DSR) ? TIOCM_DSR : 0)
| ((mlast & DM_CTS) ? TIOCM_CTS : 0);
return put_user(mlast, (unsigned int __user *) value);
}
/*
* Set modem lines
*/
static int set_modem_info(struct ch_struct *ch, unsigned int command,
unsigned int *value)
{
int error;
unsigned int arg;
int mval = 0;
ulong lock_flags;
error = access_ok(VERIFY_READ, (void __user *) value, sizeof(int));
if (error == 0)
return -EFAULT;
if (get_user(arg, (unsigned int __user *) value))
return -EFAULT;
mval |= ((arg & TIOCM_RTS) ? DM_RTS : 0)
| ((arg & TIOCM_DTR) ? DM_DTR : 0);
switch (command) {
case TIOCMBIS: /* set flags */
ch->ch_mout |= mval;
break;
case TIOCMBIC: /* clear flags */
ch->ch_mout &= ~mval;
break;
case TIOCMSET:
ch->ch_mout = mval;
break;
default:
return -EINVAL;
}
spin_lock_irqsave(&(ch->ch_nd)->nd_lock, lock_flags);
ch->ch_flag |= CH_PARAM;
(ch->ch_nd)->nd_tx_work = 1;
wake_up_interruptible(&ch->ch_flag_wait);
spin_unlock_irqrestore(&(ch->ch_nd)->nd_lock, lock_flags);
return 0;
}
/*
* Assign the custom baud rate to the channel structure
*/
static void dgrp_set_custom_speed(struct ch_struct *ch, int newrate)
{
int testdiv;
int testrate_high;
int testrate_low;
int deltahigh, deltalow;
if (newrate < 0)
newrate = 0;
/*
* Since the divisor is stored in a 16-bit integer, we make sure
* we don't allow any rates smaller than a 16-bit integer would allow.
* And of course, rates above the dividend won't fly.
*/
if (newrate && newrate < ((PORTSERVER_DIVIDEND / 0xFFFF) + 1))
newrate = ((PORTSERVER_DIVIDEND / 0xFFFF) + 1);
if (newrate && newrate > PORTSERVER_DIVIDEND)
newrate = PORTSERVER_DIVIDEND;
while (newrate > 0) {
testdiv = PORTSERVER_DIVIDEND / newrate;
/*
* If we try to figure out what rate the PortServer would use
* with the test divisor, it will be either equal or higher
* than the requested baud rate. If we then determine the
* rate with a divisor one higher, we will get the next lower
* supported rate below the requested.
*/
testrate_high = PORTSERVER_DIVIDEND / testdiv;
testrate_low = PORTSERVER_DIVIDEND / (testdiv + 1);
/*
* If the rate for the requested divisor is correct, just
* use it and be done.
*/
if (testrate_high == newrate)
break;
/*
* Otherwise, pick the rate that is closer (i.e. whichever rate
* has a smaller delta).
*/
deltahigh = testrate_high - newrate;
deltalow = newrate - testrate_low;
if (deltahigh < deltalow)
newrate = testrate_high;
else
newrate = testrate_low;
break;
}
ch->ch_custom_speed = newrate;
drp_param(ch);
return;
}
/*
# dgrp_tty_digiseta()
*
* Ioctl to set the information from ditty.
*
* NOTE: DIGI_IXON, DSRPACE, DCDPACE, and DTRPACE are unsupported. JAR 990922
*/
static int dgrp_tty_digiseta(struct tty_struct *tty,
struct digi_struct *new_info)
{
struct un_struct *un = tty->driver_data;
struct ch_struct *ch;
if (!un)
return -ENODEV;
ch = un->un_ch;
if (!ch)
return -ENODEV;
if (copy_from_user(&ch->ch_digi, (void __user *) new_info,
sizeof(struct digi_struct)))
return -EFAULT;
if ((ch->ch_digi.digi_flags & RTSPACE) ||
(ch->ch_digi.digi_flags & CTSPACE))
tty->termios.c_cflag |= CRTSCTS;
else
tty->termios.c_cflag &= ~CRTSCTS;
if (ch->ch_digi.digi_maxcps < 1)
ch->ch_digi.digi_maxcps = 1;
if (ch->ch_digi.digi_maxcps > 10000)
ch->ch_digi.digi_maxcps = 10000;
if (ch->ch_digi.digi_bufsize < 10)
ch->ch_digi.digi_bufsize = 10;
if (ch->ch_digi.digi_maxchar < 1)
ch->ch_digi.digi_maxchar = 1;
if (ch->ch_digi.digi_maxchar > ch->ch_digi.digi_bufsize)
ch->ch_digi.digi_maxchar = ch->ch_digi.digi_bufsize;
if (ch->ch_digi.digi_onlen > DIGI_PLEN)
ch->ch_digi.digi_onlen = DIGI_PLEN;
if (ch->ch_digi.digi_offlen > DIGI_PLEN)
ch->ch_digi.digi_offlen = DIGI_PLEN;
/* make the changes now */
drp_param(ch);
return 0;
}
/*
* dgrp_tty_digigetedelay()
*
* Ioctl to get the current edelay setting.
*
*
*
*/
static int dgrp_tty_digigetedelay(struct tty_struct *tty, int *retinfo)
{
struct un_struct *un;
struct ch_struct *ch;
int tmp;
if (!retinfo)
return -EFAULT;
if (!tty || tty->magic != TTY_MAGIC)
return -EFAULT;
un = tty->driver_data;
if (!un)
return -ENODEV;
ch = un->un_ch;
if (!ch)
return -ENODEV;
tmp = ch->ch_edelay;
if (copy_to_user((void __user *) retinfo, &tmp, sizeof(*retinfo)))
return -EFAULT;
return 0;
}
/*
* dgrp_tty_digisetedelay()
*
* Ioctl to set the EDELAY setting
*
*/
static int dgrp_tty_digisetedelay(struct tty_struct *tty, int *new_info)
{
struct un_struct *un;
struct ch_struct *ch;
int new_digi;
if (!tty || tty->magic != TTY_MAGIC)
return -EFAULT;
un = tty->driver_data;
if (!un)
return -ENODEV;
ch = un->un_ch;
if (!ch)
return -ENODEV;
if (copy_from_user(&new_digi, (void __user *)new_info, sizeof(int)))
return -EFAULT;
ch->ch_edelay = new_digi;
/* make the changes now */
drp_param(ch);
return 0;
}
/*
* The usual assortment of ioctl's
*
* note: use tty_check_change to make sure that we are not
* changing the state of a terminal when we are not a process
* in the forground. See tty_io.c
* rc = tty_check_change(tty);
* if (rc) return rc;
*/
static int dgrp_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
unsigned long arg)
{
struct un_struct *un;
struct ch_struct *ch;
int rc;
struct digiflow_struct dflow;
if (!tty)
return -ENODEV;
un = tty->driver_data;
if (!un)
return -ENODEV;
ch = un->un_ch;
if (!ch)
return -ENODEV;
switch (cmd) {
/*
* Here are all the standard ioctl's that we MUST implement
*/
case TCSBRK:
/*
* TCSBRK is SVID version: non-zero arg --> no break
* this behaviour is exploited by tcdrain().
*
* According to POSIX.1 spec (7.2.2.1.2) breaks should be
* between 0.25 and 0.5 seconds
*/
rc = tty_check_change(tty);
if (rc)
return rc;
tty_wait_until_sent(tty, 0);
if (!arg)
rc = dgrp_send_break(ch, 250); /* 1/4 second */
if (dgrp_tty_chars_in_buffer(tty) != 0)
return -EINTR;
return 0;
case TCSBRKP:
/* support for POSIX tcsendbreak()
*
* According to POSIX.1 spec (7.2.2.1.2) breaks should be
* between 0.25 and 0.5 seconds so we'll ask for something
* in the middle: 0.375 seconds.
*/
rc = tty_check_change(tty);
if (rc)
return rc;
tty_wait_until_sent(tty, 0);
rc = dgrp_send_break(ch, arg ? arg*250 : 250);
if (dgrp_tty_chars_in_buffer(tty) != 0)
return -EINTR;
return 0;
case TIOCSBRK:
rc = tty_check_change(tty);
if (rc)
return rc;
tty_wait_until_sent(tty, 0);
/*
* RealPort doesn't support turning on a break unconditionally.
* The RealPort device will stop sending a break automatically
* after the specified time value that we send in.
*/
rc = dgrp_send_break(ch, 250); /* 1/4 second */
if (dgrp_tty_chars_in_buffer(tty) != 0)
return -EINTR;
return 0;
case TIOCCBRK:
/*
* RealPort doesn't support turning off a break unconditionally.
* The RealPort device will stop sending a break automatically
* after the specified time value that was sent when turning on
* the break.
*/
return 0;
case TIOCMGET:
rc = access_ok(VERIFY_WRITE, (void __user *) arg,
sizeof(unsigned int));
if (rc == 0)
return -EFAULT;
return get_modem_info(ch, (unsigned int *) arg);
case TIOCMBIS:
case TIOCMBIC:
case TIOCMSET:
return set_modem_info(ch, cmd, (unsigned int *) arg);
/*
* Here are any additional ioctl's that we want to implement
*/
case TCFLSH:
/*
* The linux tty driver doesn't have a flush
* input routine for the driver, assuming all backed
* up data is in the line disc. buffers. However,
* we all know that's not the case. Here, we
* act on the ioctl, but then lie and say we didn't
* so the line discipline will process the flush
* also.
*/
rc = tty_check_change(tty);
if (rc)
return rc;
switch (arg) {
case TCIFLUSH:
case TCIOFLUSH:
/* only flush input if this is the only open unit */
if (!IS_PRINT(MINOR(tty_devnum(tty)))) {
ch->ch_rout = ch->ch_rin;
ch->ch_send |= RR_RX_FLUSH;
(ch->ch_nd)->nd_tx_work = 1;
(ch->ch_nd)->nd_tx_ready = 1;
wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq);
}
if (arg == TCIFLUSH)
break;
case TCOFLUSH: /* flush output, or the receive buffer */
/*
* This is handled in the tty_ioctl.c code
* calling tty_flush_buffer
*/
break;
default:
/* POSIX.1 says return EINVAL if we got a bad arg */
return -EINVAL;
}
/* pretend we didn't recognize this IOCTL */
return -ENOIOCTLCMD;
#ifdef TIOCGETP
case TIOCGETP:
#endif
/*****************************************
Linux HPUX Function
TCSETA TCSETA - set the termios
TCSETAF TCSETAF - wait for drain first, then set termios
TCSETAW TCSETAW - wait for drain, flush the input queue, then set termios
- looking at the tty_ioctl code, these command all call our
tty_set_termios at the driver's end, when a TCSETA* is sent,
it is expecting the tty to have a termio structure,
NOT a termios structure. These two structures differ in size
and the tty_ioctl code does a conversion before processing them both.
- we should treat the TCSETAW TCSETAF ioctls the same, and let
the tty_ioctl code do the conversion stuff.
TCSETS
TCSETSF (none)
TCSETSW
- the associated tty structure has a termios structure.
*****************************************/
case TCGETS:
case TCGETA:
return -ENOIOCTLCMD;
case TCSETAW:
case TCSETAF:
case TCSETSF:
case TCSETSW:
/*
* The linux tty driver doesn't have a flush
* input routine for the driver, assuming all backed
* up data is in the line disc. buffers. However,
* we all know that's not the case. Here, we
* act on the ioctl, but then lie and say we didn't
* so the line discipline will process the flush
* also.
*/
/*
* Also, now that we have TXPrint, we have to check
* if this is the TXPrint device and the terminal
* device is open. If so, do NOT run check_change,
* as the terminal device is ALWAYS the parent.
*/
if (!IS_PRINT(MINOR(tty_devnum(tty))) ||
!ch->ch_tun.un_open_count) {
rc = tty_check_change(tty);
if (rc)
return rc;
}
/* wait for all the characters in tbuf to drain */
tty_wait_until_sent(tty, 0);
if ((cmd == TCSETSF) || (cmd == TCSETAF)) {
/* flush the contents of the rbuf queue */
/* TODO: check if this is print device? */
ch->ch_send |= RR_RX_FLUSH;
(ch->ch_nd)->nd_tx_ready = 1;
(ch->ch_nd)->nd_tx_work = 1;
wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq);
/* do we need to do this? just to be safe! */
ch->ch_rout = ch->ch_rin;
}
/* pretend we didn't recognize this */
return -ENOIOCTLCMD;
case TCXONC:
/*
* The Linux Line Discipline (LD) would do this for us if we
* let it, but we have the special firmware options to do this
* the "right way" regardless of hardware or software flow
* control so we'll do it outselves instead of letting the LD
* do it.
*/
rc = tty_check_change(tty);
if (rc)
return rc;
switch (arg) {
case TCOON:
dgrp_tty_start(tty);
return 0;
case TCOOFF:
dgrp_tty_stop(tty);
return 0;
case TCION:
dgrp_tty_input_start(tty);
return 0;
case TCIOFF:
dgrp_tty_input_stop(tty);
return 0;
default:
return -EINVAL;
}
case DIGI_GETA:
/* get information for ditty */
if (copy_to_user((struct digi_struct __user *) arg,
&ch->ch_digi, sizeof(struct digi_struct)))
return -EFAULT;
break;
case DIGI_SETAW:
case DIGI_SETAF:
/* wait for all the characters in tbuf to drain */
tty_wait_until_sent(tty, 0);
if (cmd == DIGI_SETAF) {
/* flush the contents of the rbuf queue */
/* send down a packet with RR_RX_FLUSH set */
ch->ch_send |= RR_RX_FLUSH;
(ch->ch_nd)->nd_tx_ready = 1;
(ch->ch_nd)->nd_tx_work = 1;
wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq);
/* do we need to do this? just to be safe! */
ch->ch_rout = ch->ch_rin;
}
/* pretend we didn't recognize this */
case DIGI_SETA:
return dgrp_tty_digiseta(tty, (struct digi_struct *) arg);
case DIGI_SEDELAY:
return dgrp_tty_digisetedelay(tty, (int *) arg);
case DIGI_GEDELAY:
return dgrp_tty_digigetedelay(tty, (int *) arg);
case DIGI_GETFLOW:
case DIGI_GETAFLOW:
if (cmd == (DIGI_GETFLOW)) {
dflow.startc = tty->termios.c_cc[VSTART];
dflow.stopc = tty->termios.c_cc[VSTOP];
} else {
dflow.startc = ch->ch_xxon;
dflow.stopc = ch->ch_xxoff;
}
if (copy_to_user((char __user *)arg, &dflow, sizeof(dflow)))
return -EFAULT;
break;
case DIGI_SETFLOW:
case DIGI_SETAFLOW:
if (copy_from_user(&dflow, (char __user *)arg, sizeof(dflow)))
return -EFAULT;
if (cmd == (DIGI_SETFLOW)) {
tty->termios.c_cc[VSTART] = dflow.startc;
tty->termios.c_cc[VSTOP] = dflow.stopc;
} else {
ch->ch_xxon = dflow.startc;
ch->ch_xxoff = dflow.stopc;
}
break;
case DIGI_GETCUSTOMBAUD:
if (put_user(ch->ch_custom_speed, (unsigned int __user *) arg))
return -EFAULT;
break;
case DIGI_SETCUSTOMBAUD:
{
int new_rate;
if (get_user(new_rate, (unsigned int __user *) arg))
return -EFAULT;
dgrp_set_custom_speed(ch, new_rate);
break;
}
default:
return -ENOIOCTLCMD;
}
return 0;
}
/*
* This routine allows the tty driver to be notified when
* the device's termios setting have changed. Note that we
* should be prepared to accept the case where old == NULL
* and try to do something rational.
*
* So we need to make sure that our copies of ch_oflag,
* ch_clag, and ch_iflag reflect the tty->termios flags.
*/
static void dgrp_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
{
struct ktermios *ts;
struct ch_struct *ch;
struct un_struct *un;
/* seems silly, but we have to check all these! */
if (!tty)
return;
un = tty->driver_data;
if (!un)
return;
ts = &tty->termios;
ch = un->un_ch;
if (!ch)
return;
drp_param(ch);
/* the CLOCAL flag has just been set */
if (!(old->c_cflag & CLOCAL) && C_CLOCAL(tty))
wake_up_interruptible(&un->un_open_wait);
}
/*
* Throttle receiving data. We just set a bit and stop reading
* data out of the channel buffer. It will back up and the
* FEP will do whatever is necessary to stop the far end.
*/
static void dgrp_tty_throttle(struct tty_struct *tty)
{
struct ch_struct *ch;
if (!tty)
return;
ch = ((struct un_struct *) tty->driver_data)->un_ch;
if (!ch)
return;
ch->ch_flag |= CH_RXSTOP;
}
static void dgrp_tty_unthrottle(struct tty_struct *tty)
{
struct ch_struct *ch;
if (!tty)
return;
ch = ((struct un_struct *) tty->driver_data)->un_ch;
if (!ch)
return;
ch->ch_flag &= ~CH_RXSTOP;
}
/*
* Stop the transmitter
*/
static void dgrp_tty_stop(struct tty_struct *tty)
{
struct ch_struct *ch;
if (!tty)
return;
ch = ((struct un_struct *) tty->driver_data)->un_ch;
if (!ch)
return;
ch->ch_send |= RR_TX_STOP;
ch->ch_send &= ~RR_TX_START;
/* make the change NOW! */
(ch->ch_nd)->nd_tx_ready = 1;
if (waitqueue_active(&(ch->ch_nd)->nd_tx_waitq))
wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq);
}
/*
* Start the transmitter
*/
static void dgrp_tty_start(struct tty_struct *tty)
{
struct ch_struct *ch;
if (!tty)
return;
ch = ((struct un_struct *) tty->driver_data)->un_ch;
if (!ch)
return;
/* TODO: don't do anything if the transmitter is not stopped */
ch->ch_send |= RR_TX_START;
ch->ch_send &= ~RR_TX_STOP;
/* make the change NOW! */
(ch->ch_nd)->nd_tx_ready = 1;
(ch->ch_nd)->nd_tx_work = 1;
if (waitqueue_active(&(ch->ch_nd)->nd_tx_waitq))
wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq);
}
/*
* Stop the receiver
*/
static void dgrp_tty_input_stop(struct tty_struct *tty)
{
struct ch_struct *ch;
if (!tty)
return;
ch = ((struct un_struct *) tty->driver_data)->un_ch;
if (!ch)
return;
ch->ch_send |= RR_RX_STOP;
ch->ch_send &= ~RR_RX_START;
(ch->ch_nd)->nd_tx_ready = 1;
if (waitqueue_active(&(ch->ch_nd)->nd_tx_waitq))
wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq);
}
static void dgrp_tty_send_xchar(struct tty_struct *tty, char c)
{
struct un_struct *un;
struct ch_struct *ch;
if (!tty)
return;
un = tty->driver_data;
if (!un)
return;
ch = un->un_ch;
if (!ch)
return;
if (c == STOP_CHAR(tty))
ch->ch_send |= RR_RX_STOP;
else if (c == START_CHAR(tty))
ch->ch_send |= RR_RX_START;
ch->ch_nd->nd_tx_ready = 1;
ch->ch_nd->nd_tx_work = 1;
return;
}
static void dgrp_tty_input_start(struct tty_struct *tty)
{
struct ch_struct *ch;
if (!tty)
return;
ch = ((struct un_struct *) tty->driver_data)->un_ch;
if (!ch)
return;
ch->ch_send |= RR_RX_START;
ch->ch_send &= ~RR_RX_STOP;
(ch->ch_nd)->nd_tx_ready = 1;
(ch->ch_nd)->nd_tx_work = 1;
if (waitqueue_active(&(ch->ch_nd)->nd_tx_waitq))
wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq);
}
/*
* Hangup the port. Like a close, but don't wait for output
* to drain.
*
* How do we close all the channels that are open?
*/
static void dgrp_tty_hangup(struct tty_struct *tty)
{
struct ch_struct *ch;
struct nd_struct *nd;
struct un_struct *un;
if (!tty)
return;
un = tty->driver_data;
if (!un)
return;
ch = un->un_ch;
if (!ch)
return;
nd = ch->ch_nd;
if (C_HUPCL(tty)) {
/* LOWER DTR */
ch->ch_mout &= ~DM_DTR;
/* Don't do this here */
/* ch->ch_flag |= CH_HANGUP; */
ch->ch_nd->nd_tx_ready = 1;
ch->ch_nd->nd_tx_work = 1;
if (waitqueue_active(&ch->ch_flag_wait))
wake_up_interruptible(&ch->ch_flag_wait);
}
}
/************************************************************************/
/* */
/* TTY Initialization/Cleanup Functions */
/* */
/************************************************************************/
/*
* Uninitialize the TTY portion of the supplied node. Free all
* memory and resources associated with this node. Do it in reverse
* allocation order: this might possibly result in less fragmentation
* of memory, though I don't know this for sure.
*/
void
dgrp_tty_uninit(struct nd_struct *nd)
{
unsigned int i;
char id[3];
ID_TO_CHAR(nd->nd_ID, id);
if (nd->nd_ttdriver_flags & SERIAL_TTDRV_REG) {
tty_unregister_driver(nd->nd_serial_ttdriver);
kfree(nd->nd_serial_ttdriver->ttys);
nd->nd_serial_ttdriver->ttys = NULL;
put_tty_driver(nd->nd_serial_ttdriver);
nd->nd_ttdriver_flags &= ~SERIAL_TTDRV_REG;
}
if (nd->nd_ttdriver_flags & CALLOUT_TTDRV_REG) {
tty_unregister_driver(nd->nd_callout_ttdriver);
kfree(nd->nd_callout_ttdriver->ttys);
nd->nd_callout_ttdriver->ttys = NULL;
put_tty_driver(nd->nd_callout_ttdriver);
nd->nd_ttdriver_flags &= ~CALLOUT_TTDRV_REG;
}
if (nd->nd_ttdriver_flags & XPRINT_TTDRV_REG) {
tty_unregister_driver(nd->nd_xprint_ttdriver);
kfree(nd->nd_xprint_ttdriver->ttys);
nd->nd_xprint_ttdriver->ttys = NULL;
put_tty_driver(nd->nd_xprint_ttdriver);
nd->nd_ttdriver_flags &= ~XPRINT_TTDRV_REG;
}
for (i = 0; i < CHAN_MAX; i++)
tty_port_destroy(&nd->nd_chan[i].port);
}
/*
* Initialize the TTY portion of the supplied node.
*/
int
dgrp_tty_init(struct nd_struct *nd)
{
char id[3];
int rc;
int i;
ID_TO_CHAR(nd->nd_ID, id);
/*
* Initialize the TTDRIVER structures.
*/
nd->nd_serial_ttdriver = alloc_tty_driver(CHAN_MAX);
if (!nd->nd_serial_ttdriver)
return -ENOMEM;
sprintf(nd->nd_serial_name, "tty_dgrp_%s_", id);
nd->nd_serial_ttdriver->owner = THIS_MODULE;
nd->nd_serial_ttdriver->name = nd->nd_serial_name;
nd->nd_serial_ttdriver->name_base = 0;
nd->nd_serial_ttdriver->major = 0;
nd->nd_serial_ttdriver->minor_start = 0;
nd->nd_serial_ttdriver->type = TTY_DRIVER_TYPE_SERIAL;
nd->nd_serial_ttdriver->subtype = SERIAL_TYPE_NORMAL;
nd->nd_serial_ttdriver->init_termios = DefaultTermios;
nd->nd_serial_ttdriver->driver_name = "dgrp";
nd->nd_serial_ttdriver->flags = (TTY_DRIVER_REAL_RAW |
TTY_DRIVER_DYNAMIC_DEV |
TTY_DRIVER_HARDWARE_BREAK);
/* The kernel wants space to store pointers to tty_structs. */
nd->nd_serial_ttdriver->ttys =
kzalloc(CHAN_MAX * sizeof(struct tty_struct *), GFP_KERNEL);
if (!nd->nd_serial_ttdriver->ttys)
return -ENOMEM;
tty_set_operations(nd->nd_serial_ttdriver, &dgrp_tty_ops);
if (!(nd->nd_ttdriver_flags & SERIAL_TTDRV_REG)) {
/*
* Register tty devices
*/
rc = tty_register_driver(nd->nd_serial_ttdriver);
if (rc < 0) {
/*
* If errno is EBUSY, this means there are no more
* slots available to have us auto-majored.
* (Which is currently supported up to 256)
*
* We can still request majors above 256,
* we just have to do it manually.
*/
if (rc == -EBUSY) {
int i;
int max_majors = 1U << (32 - MINORBITS);
for (i = 256; i < max_majors; i++) {
nd->nd_serial_ttdriver->major = i;
rc = tty_register_driver(nd->nd_serial_ttdriver);
if (rc >= 0)
break;
}
/* Really fail now, since we ran out
* of majors to try. */
if (i == max_majors)
return rc;
} else {
return rc;
}
}
nd->nd_ttdriver_flags |= SERIAL_TTDRV_REG;
}
nd->nd_callout_ttdriver = alloc_tty_driver(CHAN_MAX);
if (!nd->nd_callout_ttdriver)
return -ENOMEM;
sprintf(nd->nd_callout_name, "cu_dgrp_%s_", id);
nd->nd_callout_ttdriver->owner = THIS_MODULE;
nd->nd_callout_ttdriver->name = nd->nd_callout_name;
nd->nd_callout_ttdriver->name_base = 0;
nd->nd_callout_ttdriver->major = nd->nd_serial_ttdriver->major;
nd->nd_callout_ttdriver->minor_start = 0x40;
nd->nd_callout_ttdriver->type = TTY_DRIVER_TYPE_SERIAL;
nd->nd_callout_ttdriver->subtype = SERIAL_TYPE_CALLOUT;
nd->nd_callout_ttdriver->init_termios = DefaultTermios;
nd->nd_callout_ttdriver->driver_name = "dgrp";
nd->nd_callout_ttdriver->flags = (TTY_DRIVER_REAL_RAW |
TTY_DRIVER_DYNAMIC_DEV |
TTY_DRIVER_HARDWARE_BREAK);
/* The kernel wants space to store pointers to tty_structs. */
nd->nd_callout_ttdriver->ttys =
kzalloc(CHAN_MAX * sizeof(struct tty_struct *), GFP_KERNEL);
if (!nd->nd_callout_ttdriver->ttys)
return -ENOMEM;
tty_set_operations(nd->nd_callout_ttdriver, &dgrp_tty_ops);
if (dgrp_register_cudevices) {
if (!(nd->nd_ttdriver_flags & CALLOUT_TTDRV_REG)) {
/*
* Register cu devices
*/
rc = tty_register_driver(nd->nd_callout_ttdriver);
if (rc < 0)
return rc;
nd->nd_ttdriver_flags |= CALLOUT_TTDRV_REG;
}
}
nd->nd_xprint_ttdriver = alloc_tty_driver(CHAN_MAX);
if (!nd->nd_xprint_ttdriver)
return -ENOMEM;
sprintf(nd->nd_xprint_name, "pr_dgrp_%s_", id);
nd->nd_xprint_ttdriver->owner = THIS_MODULE;
nd->nd_xprint_ttdriver->name = nd->nd_xprint_name;
nd->nd_xprint_ttdriver->name_base = 0;
nd->nd_xprint_ttdriver->major = nd->nd_serial_ttdriver->major;
nd->nd_xprint_ttdriver->minor_start = 0x80;
nd->nd_xprint_ttdriver->type = TTY_DRIVER_TYPE_SERIAL;
nd->nd_xprint_ttdriver->subtype = SERIAL_TYPE_XPRINT;
nd->nd_xprint_ttdriver->init_termios = DefaultTermios;
nd->nd_xprint_ttdriver->driver_name = "dgrp";
nd->nd_xprint_ttdriver->flags = (TTY_DRIVER_REAL_RAW |
TTY_DRIVER_DYNAMIC_DEV |
TTY_DRIVER_HARDWARE_BREAK);
/* The kernel wants space to store pointers to tty_structs. */
nd->nd_xprint_ttdriver->ttys =
kzalloc(CHAN_MAX * sizeof(struct tty_struct *), GFP_KERNEL);
if (!nd->nd_xprint_ttdriver->ttys)
return -ENOMEM;
tty_set_operations(nd->nd_xprint_ttdriver, &dgrp_tty_ops);
if (dgrp_register_prdevices) {
if (!(nd->nd_ttdriver_flags & XPRINT_TTDRV_REG)) {
/*
* Register transparent print devices
*/
rc = tty_register_driver(nd->nd_xprint_ttdriver);
if (rc < 0)
return rc;
nd->nd_ttdriver_flags |= XPRINT_TTDRV_REG;
}
}
for (i = 0; i < CHAN_MAX; i++) {
struct ch_struct *ch = nd->nd_chan + i;
ch->ch_nd = nd;
ch->ch_digi = digi_init;
ch->ch_edelay = 100;
ch->ch_custom_speed = 0;
ch->ch_portnum = i;
ch->ch_tun.un_ch = ch;
ch->ch_pun.un_ch = ch;
ch->ch_tun.un_type = SERIAL_TYPE_NORMAL;
ch->ch_pun.un_type = SERIAL_TYPE_XPRINT;
init_waitqueue_head(&(ch->ch_flag_wait));
init_waitqueue_head(&(ch->ch_sleep));
init_waitqueue_head(&(ch->ch_tun.un_open_wait));
init_waitqueue_head(&(ch->ch_tun.un_close_wait));
init_waitqueue_head(&(ch->ch_pun.un_open_wait));
init_waitqueue_head(&(ch->ch_pun.un_close_wait));
tty_port_init(&ch->port);
}
return 0;
}