blob: 03c15069731f758e3e71312d32bcbef86060c3a8 [file] [log] [blame]
/*
* Copyright 2003 Digi International (www.digi.com)
* Scott H Kilau <Scott_Kilau 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
* NOTE TO LINUX KERNEL HACKERS: DO NOT REFORMAT THIS CODE!
*
* This is shared code between Digi's CVS archive and the
* Linux Kernel sources.
* Changing the source just for reformatting needlessly breaks
* our CVS diff history.
*
* Send any bug fixes/changes to: Eng.Linux at digi dot com.
* Thank you.
*/
/************************************************************************
*
* This file implements the tty driver functionality for the
* Neo and ClassicBoard PCI based product lines.
*
************************************************************************
*
*/
#include <linux/kernel.h>
#include <linux/sched.h> /* For jiffies, task states */
#include <linux/interrupt.h> /* For tasklet and interrupt structs/defines */
#include <linux/module.h>
#include <linux/ctype.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_reg.h>
#include <linux/slab.h>
#include <linux/delay.h> /* For udelay */
#include <linux/uaccess.h> /* For copy_from_user/copy_to_user */
#include <linux/pci.h>
#include "dgnc_driver.h"
#include "dgnc_tty.h"
#include "dgnc_types.h"
#include "dgnc_neo.h"
#include "dgnc_cls.h"
#include "dpacompat.h"
#include "dgnc_sysfs.h"
#include "dgnc_utils.h"
#define init_MUTEX(sem) sema_init(sem, 1)
#define DECLARE_MUTEX(name) \
struct semaphore name = __SEMAPHORE_INITIALIZER(name, 1)
/*
* internal variables
*/
static struct dgnc_board *dgnc_BoardsByMajor[256];
static unsigned char *dgnc_TmpWriteBuf;
static DECLARE_MUTEX(dgnc_TmpWriteSem);
/*
* Default transparent print information.
*/
static struct digi_t dgnc_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 DgncDefaultTermios = {
.c_iflag = (DEFAULT_IFLAGS), /* iflags */
.c_oflag = (DEFAULT_OFLAGS), /* oflags */
.c_cflag = (DEFAULT_CFLAGS), /* cflags */
.c_lflag = (DEFAULT_LFLAGS), /* lflags */
.c_cc = INIT_C_CC,
.c_line = 0,
};
/* Our function prototypes */
static int dgnc_tty_open(struct tty_struct *tty, struct file *file);
static void dgnc_tty_close(struct tty_struct *tty, struct file *file);
static int dgnc_block_til_ready(struct tty_struct *tty, struct file *file, struct channel_t *ch);
static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
static int dgnc_tty_digigeta(struct tty_struct *tty, struct digi_t __user *retinfo);
static int dgnc_tty_digiseta(struct tty_struct *tty, struct digi_t __user *new_info);
static int dgnc_tty_write_room(struct tty_struct *tty);
static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c);
static int dgnc_tty_chars_in_buffer(struct tty_struct *tty);
static void dgnc_tty_start(struct tty_struct *tty);
static void dgnc_tty_stop(struct tty_struct *tty);
static void dgnc_tty_throttle(struct tty_struct *tty);
static void dgnc_tty_unthrottle(struct tty_struct *tty);
static void dgnc_tty_flush_chars(struct tty_struct *tty);
static void dgnc_tty_flush_buffer(struct tty_struct *tty);
static void dgnc_tty_hangup(struct tty_struct *tty);
static int dgnc_set_modem_info(struct tty_struct *tty, unsigned int command, unsigned int __user *value);
static int dgnc_get_modem_info(struct channel_t *ch, unsigned int __user *value);
static int dgnc_tty_tiocmget(struct tty_struct *tty);
static int dgnc_tty_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear);
static int dgnc_tty_send_break(struct tty_struct *tty, int msec);
static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout);
static int dgnc_tty_write(struct tty_struct *tty, const unsigned char *buf, int count);
static void dgnc_tty_set_termios(struct tty_struct *tty, struct ktermios *old_termios);
static void dgnc_tty_send_xchar(struct tty_struct *tty, char ch);
static const struct tty_operations dgnc_tty_ops = {
.open = dgnc_tty_open,
.close = dgnc_tty_close,
.write = dgnc_tty_write,
.write_room = dgnc_tty_write_room,
.flush_buffer = dgnc_tty_flush_buffer,
.chars_in_buffer = dgnc_tty_chars_in_buffer,
.flush_chars = dgnc_tty_flush_chars,
.ioctl = dgnc_tty_ioctl,
.set_termios = dgnc_tty_set_termios,
.stop = dgnc_tty_stop,
.start = dgnc_tty_start,
.throttle = dgnc_tty_throttle,
.unthrottle = dgnc_tty_unthrottle,
.hangup = dgnc_tty_hangup,
.put_char = dgnc_tty_put_char,
.tiocmget = dgnc_tty_tiocmget,
.tiocmset = dgnc_tty_tiocmset,
.break_ctl = dgnc_tty_send_break,
.wait_until_sent = dgnc_tty_wait_until_sent,
.send_xchar = dgnc_tty_send_xchar
};
/************************************************************************
*
* TTY Initialization/Cleanup Functions
*
************************************************************************/
/*
* dgnc_tty_preinit()
*
* Initialize any global tty related data before we download any boards.
*/
int dgnc_tty_preinit(void)
{
/*
* Allocate a buffer for doing the copy from user space to
* kernel space in dgnc_write(). We only use one buffer and
* control access to it with a semaphore. If we are paging, we
* are already in trouble so one buffer won't hurt much anyway.
*
* We are okay to sleep in the malloc, as this routine
* is only called during module load, (not in interrupt context),
* and with no locks held.
*/
dgnc_TmpWriteBuf = kmalloc(WRITEBUFLEN, GFP_KERNEL);
if (!dgnc_TmpWriteBuf)
return -ENOMEM;
return 0;
}
/*
* dgnc_tty_register()
*
* Init the tty subsystem for this board.
*/
int dgnc_tty_register(struct dgnc_board *brd)
{
int rc = 0;
brd->SerialDriver.magic = TTY_DRIVER_MAGIC;
snprintf(brd->SerialName, MAXTTYNAMELEN, "tty_dgnc_%d_", brd->boardnum);
brd->SerialDriver.name = brd->SerialName;
brd->SerialDriver.name_base = 0;
brd->SerialDriver.major = 0;
brd->SerialDriver.minor_start = 0;
brd->SerialDriver.num = brd->maxports;
brd->SerialDriver.type = TTY_DRIVER_TYPE_SERIAL;
brd->SerialDriver.subtype = SERIAL_TYPE_NORMAL;
brd->SerialDriver.init_termios = DgncDefaultTermios;
brd->SerialDriver.driver_name = DRVSTR;
brd->SerialDriver.flags = (TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_HARDWARE_BREAK);
/*
* The kernel wants space to store pointers to
* tty_struct's and termios's.
*/
brd->SerialDriver.ttys = kcalloc(brd->maxports, sizeof(*brd->SerialDriver.ttys), GFP_KERNEL);
if (!brd->SerialDriver.ttys)
return -ENOMEM;
kref_init(&brd->SerialDriver.kref);
brd->SerialDriver.termios = kcalloc(brd->maxports, sizeof(*brd->SerialDriver.termios), GFP_KERNEL);
if (!brd->SerialDriver.termios)
return -ENOMEM;
/*
* Entry points for driver. Called by the kernel from
* tty_io.c and n_tty.c.
*/
tty_set_operations(&brd->SerialDriver, &dgnc_tty_ops);
if (!brd->dgnc_Major_Serial_Registered) {
/* Register tty devices */
rc = tty_register_driver(&brd->SerialDriver);
if (rc < 0) {
APR(("Can't register tty device (%d)\n", rc));
return rc;
}
brd->dgnc_Major_Serial_Registered = TRUE;
}
/*
* If we're doing transparent print, we have to do all of the above
* again, separately so we don't get the LD confused about what major
* we are when we get into the dgnc_tty_open() routine.
*/
brd->PrintDriver.magic = TTY_DRIVER_MAGIC;
snprintf(brd->PrintName, MAXTTYNAMELEN, "pr_dgnc_%d_", brd->boardnum);
brd->PrintDriver.name = brd->PrintName;
brd->PrintDriver.name_base = 0;
brd->PrintDriver.major = brd->SerialDriver.major;
brd->PrintDriver.minor_start = 0x80;
brd->PrintDriver.num = brd->maxports;
brd->PrintDriver.type = TTY_DRIVER_TYPE_SERIAL;
brd->PrintDriver.subtype = SERIAL_TYPE_NORMAL;
brd->PrintDriver.init_termios = DgncDefaultTermios;
brd->PrintDriver.driver_name = DRVSTR;
brd->PrintDriver.flags = (TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_HARDWARE_BREAK);
/*
* The kernel wants space to store pointers to
* tty_struct's and termios's. Must be separated from
* the Serial Driver so we don't get confused
*/
brd->PrintDriver.ttys = kcalloc(brd->maxports, sizeof(*brd->PrintDriver.ttys), GFP_KERNEL);
if (!brd->PrintDriver.ttys)
return -ENOMEM;
kref_init(&brd->PrintDriver.kref);
brd->PrintDriver.termios = kcalloc(brd->maxports, sizeof(*brd->PrintDriver.termios), GFP_KERNEL);
if (!brd->PrintDriver.termios)
return -ENOMEM;
/*
* Entry points for driver. Called by the kernel from
* tty_io.c and n_tty.c.
*/
tty_set_operations(&brd->PrintDriver, &dgnc_tty_ops);
if (!brd->dgnc_Major_TransparentPrint_Registered) {
/* Register Transparent Print devices */
rc = tty_register_driver(&brd->PrintDriver);
if (rc < 0) {
APR(("Can't register Transparent Print device (%d)\n", rc));
return rc;
}
brd->dgnc_Major_TransparentPrint_Registered = TRUE;
}
dgnc_BoardsByMajor[brd->SerialDriver.major] = brd;
brd->dgnc_Serial_Major = brd->SerialDriver.major;
brd->dgnc_TransparentPrint_Major = brd->PrintDriver.major;
return rc;
}
/*
* dgnc_tty_init()
*
* Init the tty subsystem. Called once per board after board has been
* downloaded and init'ed.
*/
int dgnc_tty_init(struct dgnc_board *brd)
{
int i;
void __iomem *vaddr;
struct channel_t *ch;
if (!brd)
return -ENXIO;
/*
* Initialize board structure elements.
*/
vaddr = brd->re_map_membase;
brd->nasync = brd->maxports;
/*
* Allocate channel memory that might not have been allocated
* when the driver was first loaded.
*/
for (i = 0; i < brd->nasync; i++) {
if (!brd->channels[i]) {
/*
* Okay to malloc with GFP_KERNEL, we are not at
* interrupt context, and there are no locks held.
*/
brd->channels[i] = kzalloc(sizeof(*brd->channels[i]), GFP_KERNEL);
}
}
ch = brd->channels[0];
vaddr = brd->re_map_membase;
/* Set up channel variables */
for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) {
if (!brd->channels[i])
continue;
spin_lock_init(&ch->ch_lock);
/* Store all our magic numbers */
ch->magic = DGNC_CHANNEL_MAGIC;
ch->ch_tun.magic = DGNC_UNIT_MAGIC;
ch->ch_tun.un_ch = ch;
ch->ch_tun.un_type = DGNC_SERIAL;
ch->ch_tun.un_dev = i;
ch->ch_pun.magic = DGNC_UNIT_MAGIC;
ch->ch_pun.un_ch = ch;
ch->ch_pun.un_type = DGNC_PRINT;
ch->ch_pun.un_dev = i + 128;
if (brd->bd_uart_offset == 0x200)
ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i);
else
ch->ch_cls_uart = vaddr + (brd->bd_uart_offset * i);
ch->ch_bd = brd;
ch->ch_portnum = i;
ch->ch_digi = dgnc_digi_init;
/* .25 second delay */
ch->ch_close_delay = 250;
init_waitqueue_head(&ch->ch_flags_wait);
init_waitqueue_head(&ch->ch_tun.un_flags_wait);
init_waitqueue_head(&ch->ch_pun.un_flags_wait);
init_waitqueue_head(&ch->ch_sniff_wait);
{
struct device *classp;
classp = tty_register_device(&brd->SerialDriver, i,
&(ch->ch_bd->pdev->dev));
ch->ch_tun.un_sysfs = classp;
dgnc_create_tty_sysfs(&ch->ch_tun, classp);
classp = tty_register_device(&brd->PrintDriver, i,
&(ch->ch_bd->pdev->dev));
ch->ch_pun.un_sysfs = classp;
dgnc_create_tty_sysfs(&ch->ch_pun, classp);
}
}
return 0;
}
/*
* dgnc_tty_post_uninit()
*
* UnInitialize any global tty related data.
*/
void dgnc_tty_post_uninit(void)
{
kfree(dgnc_TmpWriteBuf);
dgnc_TmpWriteBuf = NULL;
}
/*
* dgnc_tty_uninit()
*
* Uninitialize the TTY portion of this driver. Free all memory and
* resources.
*/
void dgnc_tty_uninit(struct dgnc_board *brd)
{
int i = 0;
if (brd->dgnc_Major_Serial_Registered) {
dgnc_BoardsByMajor[brd->SerialDriver.major] = NULL;
brd->dgnc_Serial_Major = 0;
for (i = 0; i < brd->nasync; i++) {
dgnc_remove_tty_sysfs(brd->channels[i]->ch_tun.un_sysfs);
tty_unregister_device(&brd->SerialDriver, i);
}
tty_unregister_driver(&brd->SerialDriver);
brd->dgnc_Major_Serial_Registered = FALSE;
}
if (brd->dgnc_Major_TransparentPrint_Registered) {
dgnc_BoardsByMajor[brd->PrintDriver.major] = NULL;
brd->dgnc_TransparentPrint_Major = 0;
for (i = 0; i < brd->nasync; i++) {
dgnc_remove_tty_sysfs(brd->channels[i]->ch_pun.un_sysfs);
tty_unregister_device(&brd->PrintDriver, i);
}
tty_unregister_driver(&brd->PrintDriver);
brd->dgnc_Major_TransparentPrint_Registered = FALSE;
}
kfree(brd->SerialDriver.ttys);
brd->SerialDriver.ttys = NULL;
kfree(brd->PrintDriver.ttys);
brd->PrintDriver.ttys = NULL;
}
#define TMPBUFLEN (1024)
/*
* dgnc_sniff - Dump data out to the "sniff" buffer if the
* proc sniff file is opened...
*/
void dgnc_sniff_nowait_nolock(struct channel_t *ch, unsigned char *text, unsigned char *buf, int len)
{
struct timeval tv;
int n;
int r;
int nbuf;
int i;
int tmpbuflen;
char *tmpbuf;
char *p;
int too_much_data;
tmpbuf = kzalloc(TMPBUFLEN, GFP_ATOMIC);
if (!tmpbuf)
return;
p = tmpbuf;
/* Leave if sniff not open */
if (!(ch->ch_sniff_flags & SNIFF_OPEN))
goto exit;
do_gettimeofday(&tv);
/* Create our header for data dump */
p += sprintf(p, "<%ld %ld><%s><", tv.tv_sec, tv.tv_usec, text);
tmpbuflen = p - tmpbuf;
do {
too_much_data = 0;
for (i = 0; i < len && tmpbuflen < (TMPBUFLEN - 4); i++) {
p += sprintf(p, "%02x ", *buf);
buf++;
tmpbuflen = p - tmpbuf;
}
if (tmpbuflen < (TMPBUFLEN - 4)) {
if (i > 0)
p += sprintf(p - 1, "%s\n", ">");
else
p += sprintf(p, "%s\n", ">");
} else {
too_much_data = 1;
len -= i;
}
nbuf = strlen(tmpbuf);
p = tmpbuf;
/*
* Loop while data remains.
*/
while (nbuf > 0 && ch->ch_sniff_buf) {
/*
* Determine the amount of available space left in the
* buffer. If there's none, wait until some appears.
*/
n = (ch->ch_sniff_out - ch->ch_sniff_in - 1) & SNIFF_MASK;
/*
* If there is no space left to write to in our sniff buffer,
* we have no choice but to drop the data.
* We *cannot* sleep here waiting for space, because this
* function was probably called by the interrupt/timer routines!
*/
if (n == 0)
goto exit;
/*
* Copy as much data as will fit.
*/
if (n > nbuf)
n = nbuf;
r = SNIFF_MAX - ch->ch_sniff_in;
if (r <= n) {
memcpy(ch->ch_sniff_buf + ch->ch_sniff_in, p, r);
n -= r;
ch->ch_sniff_in = 0;
p += r;
nbuf -= r;
}
memcpy(ch->ch_sniff_buf + ch->ch_sniff_in, p, n);
ch->ch_sniff_in += n;
p += n;
nbuf -= n;
/*
* Wakeup any thread waiting for data
*/
if (ch->ch_sniff_flags & SNIFF_WAIT_DATA) {
ch->ch_sniff_flags &= ~SNIFF_WAIT_DATA;
wake_up_interruptible(&ch->ch_sniff_wait);
}
}
/*
* If the user sent us too much data to push into our tmpbuf,
* we need to keep looping around on all the data.
*/
if (too_much_data) {
p = tmpbuf;
tmpbuflen = 0;
}
} while (too_much_data);
exit:
kfree(tmpbuf);
}
/*=======================================================================
*
* dgnc_wmove - Write data to transmit queue.
*
* ch - Pointer to channel structure.
* buf - Poiter to characters to be moved.
* n - Number of characters to move.
*
*=======================================================================*/
static void dgnc_wmove(struct channel_t *ch, char *buf, uint n)
{
int remain;
uint head;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return;
head = ch->ch_w_head & WQUEUEMASK;
/*
* If the write wraps over the top of the circular buffer,
* move the portion up to the wrap point, and reset the
* pointers to the bottom.
*/
remain = WQUEUESIZE - head;
if (n >= remain) {
n -= remain;
memcpy(ch->ch_wqueue + head, buf, remain);
head = 0;
buf += remain;
}
if (n > 0) {
/*
* Move rest of data.
*/
remain = n;
memcpy(ch->ch_wqueue + head, buf, remain);
head += remain;
}
head &= WQUEUEMASK;
ch->ch_w_head = head;
}
/*=======================================================================
*
* dgnc_input - Process received data.
*
* ch - Pointer to channel structure.
*
*=======================================================================*/
void dgnc_input(struct channel_t *ch)
{
struct dgnc_board *bd;
struct tty_struct *tp;
struct tty_ldisc *ld;
uint rmask;
ushort head;
ushort tail;
int data_len;
unsigned long flags;
int flip_len;
int len = 0;
int n = 0;
int s = 0;
int i = 0;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return;
tp = ch->ch_tun.un_tty;
bd = ch->ch_bd;
if (!bd || bd->magic != DGNC_BOARD_MAGIC)
return;
spin_lock_irqsave(&ch->ch_lock, flags);
/*
* Figure the number of characters in the buffer.
* Exit immediately if none.
*/
rmask = RQUEUEMASK;
head = ch->ch_r_head & rmask;
tail = ch->ch_r_tail & rmask;
data_len = (head - tail) & rmask;
if (data_len == 0) {
spin_unlock_irqrestore(&ch->ch_lock, flags);
return;
}
/*
* If the device is not open, or CREAD is off,
* flush input data and return immediately.
*/
if (!tp || (tp->magic != TTY_MAGIC) || !(ch->ch_tun.un_flags & UN_ISOPEN) ||
!(tp->termios.c_cflag & CREAD) || (ch->ch_tun.un_flags & UN_CLOSING)) {
ch->ch_r_head = tail;
/* Force queue flow control to be released, if needed */
dgnc_check_queue_flow_control(ch);
spin_unlock_irqrestore(&ch->ch_lock, flags);
return;
}
/*
* If we are throttled, simply don't read any data.
*/
if (ch->ch_flags & CH_FORCED_STOPI) {
spin_unlock_irqrestore(&ch->ch_lock, flags);
return;
}
flip_len = TTY_FLIPBUF_SIZE;
/* Chop down the length, if needed */
len = min(data_len, flip_len);
len = min(len, (N_TTY_BUF_SIZE - 1));
ld = tty_ldisc_ref(tp);
#ifdef TTY_DONT_FLIP
/*
* If the DONT_FLIP flag is on, don't flush our buffer, and act
* like the ld doesn't have any space to put the data right now.
*/
if (test_bit(TTY_DONT_FLIP, &tp->flags))
len = 0;
#endif
/*
* If we were unable to get a reference to the ld,
* don't flush our buffer, and act like the ld doesn't
* have any space to put the data right now.
*/
if (!ld) {
len = 0;
} else {
/*
* If ld doesn't have a pointer to a receive_buf function,
* flush the data, then act like the ld doesn't have any
* space to put the data right now.
*/
if (!ld->ops->receive_buf) {
ch->ch_r_head = ch->ch_r_tail;
len = 0;
}
}
if (len <= 0) {
spin_unlock_irqrestore(&ch->ch_lock, flags);
if (ld)
tty_ldisc_deref(ld);
return;
}
/*
* The tty layer in the kernel has changed in 2.6.16+.
*
* The flip buffers in the tty structure are no longer exposed,
* and probably will be going away eventually.
*
* If we are completely raw, we don't need to go through a lot
* of the tty layers that exist.
* In this case, we take the shortest and fastest route we
* can to relay the data to the user.
*
* On the other hand, if we are not raw, we need to go through
* the new 2.6.16+ tty layer, which has its API more well defined.
*/
len = tty_buffer_request_room(tp->port, len);
n = len;
/*
* n now contains the most amount of data we can copy,
* bounded either by how much the Linux tty layer can handle,
* or the amount of data the card actually has pending...
*/
while (n) {
s = ((head >= tail) ? head : RQUEUESIZE) - tail;
s = min(s, n);
if (s <= 0)
break;
/*
* If conditions are such that ld needs to see all
* UART errors, we will have to walk each character
* and error byte and send them to the buffer one at
* a time.
*/
if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) {
for (i = 0; i < s; i++) {
if (*(ch->ch_equeue + tail + i) & UART_LSR_BI)
tty_insert_flip_char(tp->port, *(ch->ch_rqueue + tail + i), TTY_BREAK);
else if (*(ch->ch_equeue + tail + i) & UART_LSR_PE)
tty_insert_flip_char(tp->port, *(ch->ch_rqueue + tail + i), TTY_PARITY);
else if (*(ch->ch_equeue + tail + i) & UART_LSR_FE)
tty_insert_flip_char(tp->port, *(ch->ch_rqueue + tail + i), TTY_FRAME);
else
tty_insert_flip_char(tp->port, *(ch->ch_rqueue + tail + i), TTY_NORMAL);
}
} else {
tty_insert_flip_string(tp->port, ch->ch_rqueue + tail, s);
}
dgnc_sniff_nowait_nolock(ch, "USER READ", ch->ch_rqueue + tail, s);
tail += s;
n -= s;
/* Flip queue if needed */
tail &= rmask;
}
ch->ch_r_tail = tail & rmask;
ch->ch_e_tail = tail & rmask;
dgnc_check_queue_flow_control(ch);
spin_unlock_irqrestore(&ch->ch_lock, flags);
/* Tell the tty layer its okay to "eat" the data now */
tty_flip_buffer_push(tp->port);
if (ld)
tty_ldisc_deref(ld);
}
/************************************************************************
* Determines when CARRIER changes state and takes appropriate
* action.
************************************************************************/
void dgnc_carrier(struct channel_t *ch)
{
struct dgnc_board *bd;
int virt_carrier = 0;
int phys_carrier = 0;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return;
bd = ch->ch_bd;
if (!bd || bd->magic != DGNC_BOARD_MAGIC)
return;
if (ch->ch_mistat & UART_MSR_DCD)
phys_carrier = 1;
if (ch->ch_digi.digi_flags & DIGI_FORCEDCD)
virt_carrier = 1;
if (ch->ch_c_cflag & CLOCAL)
virt_carrier = 1;
/*
* Test for a VIRTUAL carrier transition to HIGH.
*/
if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) {
/*
* When carrier rises, wake any threads waiting
* for carrier in the open routine.
*/
if (waitqueue_active(&(ch->ch_flags_wait)))
wake_up_interruptible(&ch->ch_flags_wait);
}
/*
* Test for a PHYSICAL carrier transition to HIGH.
*/
if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) {
/*
* When carrier rises, wake any threads waiting
* for carrier in the open routine.
*/
if (waitqueue_active(&(ch->ch_flags_wait)))
wake_up_interruptible(&ch->ch_flags_wait);
}
/*
* Test for a PHYSICAL transition to low, so long as we aren't
* currently ignoring physical transitions (which is what "virtual
* carrier" indicates).
*
* The transition of the virtual carrier to low really doesn't
* matter... it really only means "ignore carrier state", not
* "make pretend that carrier is there".
*/
if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) &&
(phys_carrier == 0)) {
/*
* When carrier drops:
*
* Drop carrier on all open units.
*
* Flush queues, waking up any task waiting in the
* line discipline.
*
* Send a hangup to the control terminal.
*
* Enable all select calls.
*/
if (waitqueue_active(&(ch->ch_flags_wait)))
wake_up_interruptible(&ch->ch_flags_wait);
if (ch->ch_tun.un_open_count > 0)
tty_hangup(ch->ch_tun.un_tty);
if (ch->ch_pun.un_open_count > 0)
tty_hangup(ch->ch_pun.un_tty);
}
/*
* Make sure that our cached values reflect the current reality.
*/
if (virt_carrier == 1)
ch->ch_flags |= CH_FCAR;
else
ch->ch_flags &= ~CH_FCAR;
if (phys_carrier == 1)
ch->ch_flags |= CH_CD;
else
ch->ch_flags &= ~CH_CD;
}
/*
* Assign the custom baud rate to the channel structure
*/
static void dgnc_set_custom_speed(struct channel_t *ch, uint newrate)
{
int testdiv;
int testrate_high;
int testrate_low;
int deltahigh;
int deltalow;
if (newrate <= 0) {
ch->ch_custom_speed = 0;
return;
}
/*
* 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 < ((ch->ch_bd->bd_dividend / 0xFFFF) + 1))
newrate = ((ch->ch_bd->bd_dividend / 0xFFFF) + 1);
if (newrate && newrate > ch->ch_bd->bd_dividend)
newrate = ch->ch_bd->bd_dividend;
if (newrate > 0) {
testdiv = ch->ch_bd->bd_dividend / newrate;
/*
* If we try to figure out what rate the board 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 = ch->ch_bd->bd_dividend / testdiv;
testrate_low = ch->ch_bd->bd_dividend / (testdiv + 1);
/*
* If the rate for the requested divisor is correct, just
* use it and be done.
*/
if (testrate_high != newrate) {
/*
* 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;
}
}
ch->ch_custom_speed = newrate;
}
void dgnc_check_queue_flow_control(struct channel_t *ch)
{
int qleft = 0;
/* Store how much space we have left in the queue */
qleft = ch->ch_r_tail - ch->ch_r_head - 1;
if (qleft < 0)
qleft += RQUEUEMASK + 1;
/*
* Check to see if we should enforce flow control on our queue because
* the ld (or user) isn't reading data out of our queue fast enuf.
*
* NOTE: This is done based on what the current flow control of the
* port is set for.
*
* 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt.
* This will cause the UART's FIFO to back up, and force
* the RTS signal to be dropped.
* 2) SWFLOW (IXOFF) - Keep trying to send a stop character to
* the other side, in hopes it will stop sending data to us.
* 3) NONE - Nothing we can do. We will simply drop any extra data
* that gets sent into us when the queue fills up.
*/
if (qleft < 256) {
/* HWFLOW */
if (ch->ch_digi.digi_flags & CTSPACE || ch->ch_c_cflag & CRTSCTS) {
if (!(ch->ch_flags & CH_RECEIVER_OFF)) {
ch->ch_bd->bd_ops->disable_receiver(ch);
ch->ch_flags |= (CH_RECEIVER_OFF);
}
}
/* SWFLOW */
else if (ch->ch_c_iflag & IXOFF) {
if (ch->ch_stops_sent <= MAX_STOPS_SENT) {
ch->ch_bd->bd_ops->send_stop_character(ch);
ch->ch_stops_sent++;
}
}
/* No FLOW */
else {
/* Empty... Can't do anything about the impending overflow... */
}
}
/*
* Check to see if we should unenforce flow control because
* ld (or user) finally read enuf data out of our queue.
*
* NOTE: This is done based on what the current flow control of the
* port is set for.
*
* 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt.
* This will cause the UART's FIFO to raise RTS back up,
* which will allow the other side to start sending data again.
* 2) SWFLOW (IXOFF) - Send a start character to
* the other side, so it will start sending data to us again.
* 3) NONE - Do nothing. Since we didn't do anything to turn off the
* other side, we don't need to do anything now.
*/
if (qleft > (RQUEUESIZE / 2)) {
/* HWFLOW */
if (ch->ch_digi.digi_flags & RTSPACE || ch->ch_c_cflag & CRTSCTS) {
if (ch->ch_flags & CH_RECEIVER_OFF) {
ch->ch_bd->bd_ops->enable_receiver(ch);
ch->ch_flags &= ~(CH_RECEIVER_OFF);
}
}
/* SWFLOW */
else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) {
ch->ch_stops_sent = 0;
ch->ch_bd->bd_ops->send_start_character(ch);
}
/* No FLOW */
else {
/* Nothing needed. */
}
}
}
void dgnc_wakeup_writes(struct channel_t *ch)
{
int qlen = 0;
unsigned long flags;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return;
spin_lock_irqsave(&ch->ch_lock, flags);
/*
* If channel now has space, wake up anyone waiting on the condition.
*/
qlen = ch->ch_w_head - ch->ch_w_tail;
if (qlen < 0)
qlen += WQUEUESIZE;
if (qlen >= (WQUEUESIZE - 256)) {
spin_unlock_irqrestore(&ch->ch_lock, flags);
return;
}
if (ch->ch_tun.un_flags & UN_ISOPEN) {
if ((ch->ch_tun.un_tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
ch->ch_tun.un_tty->ldisc->ops->write_wakeup) {
spin_unlock_irqrestore(&ch->ch_lock, flags);
(ch->ch_tun.un_tty->ldisc->ops->write_wakeup)(ch->ch_tun.un_tty);
spin_lock_irqsave(&ch->ch_lock, flags);
}
wake_up_interruptible(&ch->ch_tun.un_tty->write_wait);
/*
* If unit is set to wait until empty, check to make sure
* the queue AND FIFO are both empty.
*/
if (ch->ch_tun.un_flags & UN_EMPTY) {
if ((qlen == 0) && (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0)) {
ch->ch_tun.un_flags &= ~(UN_EMPTY);
/*
* If RTS Toggle mode is on, whenever
* the queue and UART is empty, keep RTS low.
*/
if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) {
ch->ch_mostat &= ~(UART_MCR_RTS);
ch->ch_bd->bd_ops->assert_modem_signals(ch);
}
/*
* If DTR Toggle mode is on, whenever
* the queue and UART is empty, keep DTR low.
*/
if (ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) {
ch->ch_mostat &= ~(UART_MCR_DTR);
ch->ch_bd->bd_ops->assert_modem_signals(ch);
}
}
}
wake_up_interruptible(&ch->ch_tun.un_flags_wait);
}
if (ch->ch_pun.un_flags & UN_ISOPEN) {
if ((ch->ch_pun.un_tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
ch->ch_pun.un_tty->ldisc->ops->write_wakeup) {
spin_unlock_irqrestore(&ch->ch_lock, flags);
(ch->ch_pun.un_tty->ldisc->ops->write_wakeup)(ch->ch_pun.un_tty);
spin_lock_irqsave(&ch->ch_lock, flags);
}
wake_up_interruptible(&ch->ch_pun.un_tty->write_wait);
/*
* If unit is set to wait until empty, check to make sure
* the queue AND FIFO are both empty.
*/
if (ch->ch_pun.un_flags & UN_EMPTY) {
if ((qlen == 0) && (ch->ch_bd->bd_ops->get_uart_bytes_left(ch) == 0))
ch->ch_pun.un_flags &= ~(UN_EMPTY);
}
wake_up_interruptible(&ch->ch_pun.un_flags_wait);
}
spin_unlock_irqrestore(&ch->ch_lock, flags);
}
/************************************************************************
*
* TTY Entry points and helper functions
*
************************************************************************/
/*
* dgnc_tty_open()
*
*/
static int dgnc_tty_open(struct tty_struct *tty, struct file *file)
{
struct dgnc_board *brd;
struct channel_t *ch;
struct un_t *un;
uint major = 0;
uint minor = 0;
int rc = 0;
unsigned long flags;
rc = 0;
major = MAJOR(tty_devnum(tty));
minor = MINOR(tty_devnum(tty));
if (major > 255)
return -ENXIO;
/* Get board pointer from our array of majors we have allocated */
brd = dgnc_BoardsByMajor[major];
if (!brd)
return -ENXIO;
/*
* If board is not yet up to a state of READY, go to
* sleep waiting for it to happen or they cancel the open.
*/
rc = wait_event_interruptible(brd->state_wait,
(brd->state & BOARD_READY));
if (rc)
return rc;
spin_lock_irqsave(&brd->bd_lock, flags);
/* If opened device is greater than our number of ports, bail. */
if (PORT_NUM(minor) > brd->nasync) {
spin_unlock_irqrestore(&brd->bd_lock, flags);
return -ENXIO;
}
ch = brd->channels[PORT_NUM(minor)];
if (!ch) {
spin_unlock_irqrestore(&brd->bd_lock, flags);
return -ENXIO;
}
/* Drop board lock */
spin_unlock_irqrestore(&brd->bd_lock, flags);
/* Grab channel lock */
spin_lock_irqsave(&ch->ch_lock, flags);
/* Figure out our type */
if (!IS_PRINT(minor)) {
un = &brd->channels[PORT_NUM(minor)]->ch_tun;
un->un_type = DGNC_SERIAL;
} else if (IS_PRINT(minor)) {
un = &brd->channels[PORT_NUM(minor)]->ch_pun;
un->un_type = DGNC_PRINT;
} else {
spin_unlock_irqrestore(&ch->ch_lock, flags);
return -ENXIO;
}
/*
* If the port is still in a previous open, and in a state
* where we simply cannot safely keep going, wait until the
* state clears.
*/
spin_unlock_irqrestore(&ch->ch_lock, flags);
rc = wait_event_interruptible(ch->ch_flags_wait, ((ch->ch_flags & CH_OPENING) == 0));
/* If ret is non-zero, user ctrl-c'ed us */
if (rc)
return -EINTR;
/*
* If either unit is in the middle of the fragile part of close,
* we just cannot touch the channel safely.
* Go to sleep, knowing that when the channel can be
* touched safely, the close routine will signal the
* ch_flags_wait to wake us back up.
*/
rc = wait_event_interruptible(ch->ch_flags_wait,
(((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & UN_CLOSING) == 0));
/* If ret is non-zero, user ctrl-c'ed us */
if (rc)
return -EINTR;
spin_lock_irqsave(&ch->ch_lock, flags);
/* Store our unit into driver_data, so we always have it available. */
tty->driver_data = un;
/*
* Initialize tty's
*/
if (!(un->un_flags & UN_ISOPEN)) {
/* Store important variables. */
un->un_tty = tty;
/* Maybe do something here to the TTY struct as well? */
}
/*
* Allocate channel buffers for read/write/error.
* Set flag, so we don't get trounced on.
*/
ch->ch_flags |= (CH_OPENING);
/* Drop locks, as malloc with GFP_KERNEL can sleep */
spin_unlock_irqrestore(&ch->ch_lock, flags);
if (!ch->ch_rqueue)
ch->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL);
if (!ch->ch_equeue)
ch->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL);
if (!ch->ch_wqueue)
ch->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL);
spin_lock_irqsave(&ch->ch_lock, flags);
ch->ch_flags &= ~(CH_OPENING);
wake_up_interruptible(&ch->ch_flags_wait);
/*
* Initialize if neither terminal or printer is open.
*/
if (!((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & UN_ISOPEN)) {
/*
* Flush input queues.
*/
ch->ch_r_head = 0;
ch->ch_r_tail = 0;
ch->ch_e_head = 0;
ch->ch_e_tail = 0;
ch->ch_w_head = 0;
ch->ch_w_tail = 0;
brd->bd_ops->flush_uart_write(ch);
brd->bd_ops->flush_uart_read(ch);
ch->ch_flags = 0;
ch->ch_cached_lsr = 0;
ch->ch_stop_sending_break = 0;
ch->ch_stops_sent = 0;
ch->ch_c_cflag = tty->termios.c_cflag;
ch->ch_c_iflag = tty->termios.c_iflag;
ch->ch_c_oflag = tty->termios.c_oflag;
ch->ch_c_lflag = tty->termios.c_lflag;
ch->ch_startc = tty->termios.c_cc[VSTART];
ch->ch_stopc = tty->termios.c_cc[VSTOP];
/*
* Bring up RTS and DTR...
* Also handle RTS or DTR toggle if set.
*/
if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE))
ch->ch_mostat |= (UART_MCR_RTS);
if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE))
ch->ch_mostat |= (UART_MCR_DTR);
/* Tell UART to init itself */
brd->bd_ops->uart_init(ch);
}
/*
* Run param in case we changed anything
*/
brd->bd_ops->param(tty);
dgnc_carrier(ch);
/*
* follow protocol for opening port
*/
spin_unlock_irqrestore(&ch->ch_lock, flags);
rc = dgnc_block_til_ready(tty, file, ch);
/* No going back now, increment our unit and channel counters */
spin_lock_irqsave(&ch->ch_lock, flags);
ch->ch_open_count++;
un->un_open_count++;
un->un_flags |= (UN_ISOPEN);
spin_unlock_irqrestore(&ch->ch_lock, flags);
return rc;
}
/*
* dgnc_block_til_ready()
*
* Wait for DCD, if needed.
*/
static int dgnc_block_til_ready(struct tty_struct *tty, struct file *file, struct channel_t *ch)
{
int retval = 0;
struct un_t *un = NULL;
unsigned long flags;
uint old_flags = 0;
int sleep_on_un_flags = 0;
if (!tty || tty->magic != TTY_MAGIC || !file || !ch || ch->magic != DGNC_CHANNEL_MAGIC)
return -ENXIO;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return -ENXIO;
spin_lock_irqsave(&ch->ch_lock, flags);
ch->ch_wopen++;
/* Loop forever */
while (1) {
sleep_on_un_flags = 0;
/*
* If board has failed somehow during our sleep, bail with error.
*/
if (ch->ch_bd->state == BOARD_FAILED) {
retval = -ENXIO;
break;
}
/* If tty was hung up, break out of loop and set error. */
if (tty_hung_up_p(file)) {
retval = -EAGAIN;
break;
}
/*
* If either unit is in the middle of the fragile part of close,
* we just cannot touch the channel safely.
* Go back to sleep, knowing that when the channel can be
* touched safely, the close routine will signal the
* ch_wait_flags to wake us back up.
*/
if (!((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & UN_CLOSING)) {
/*
* Our conditions to leave cleanly and happily:
* 1) NONBLOCKING on the tty is set.
* 2) CLOCAL is set.
* 3) DCD (fake or real) is active.
*/
if (file->f_flags & O_NONBLOCK)
break;
if (tty->flags & (1 << TTY_IO_ERROR)) {
retval = -EIO;
break;
}
if (ch->ch_flags & CH_CD)
break;
if (ch->ch_flags & CH_FCAR)
break;
} else {
sleep_on_un_flags = 1;
}
/*
* If there is a signal pending, the user probably
* interrupted (ctrl-c) us.
* Leave loop with error set.
*/
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
}
/*
* Store the flags before we let go of channel lock
*/
if (sleep_on_un_flags)
old_flags = ch->ch_tun.un_flags | ch->ch_pun.un_flags;
else
old_flags = ch->ch_flags;
/*
* Let go of channel lock before calling schedule.
* Our poller will get any FEP events and wake us up when DCD
* eventually goes active.
*/
spin_unlock_irqrestore(&ch->ch_lock, flags);
/*
* Wait for something in the flags to change from the current value.
*/
if (sleep_on_un_flags)
retval = wait_event_interruptible(un->un_flags_wait,
(old_flags != (ch->ch_tun.un_flags | ch->ch_pun.un_flags)));
else
retval = wait_event_interruptible(ch->ch_flags_wait,
(old_flags != ch->ch_flags));
/*
* We got woken up for some reason.
* Before looping around, grab our channel lock.
*/
spin_lock_irqsave(&ch->ch_lock, flags);
}
ch->ch_wopen--;
spin_unlock_irqrestore(&ch->ch_lock, flags);
if (retval)
return retval;
return 0;
}
/*
* dgnc_tty_hangup()
*
* Hangup the port. Like a close, but don't wait for output to drain.
*/
static void dgnc_tty_hangup(struct tty_struct *tty)
{
struct un_t *un;
if (!tty || tty->magic != TTY_MAGIC)
return;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return;
/* flush the transmit queues */
dgnc_tty_flush_buffer(tty);
}
/*
* dgnc_tty_close()
*
*/
static void dgnc_tty_close(struct tty_struct *tty, struct file *file)
{
struct ktermios *ts;
struct dgnc_board *bd;
struct channel_t *ch;
struct un_t *un;
unsigned long flags;
int rc = 0;
if (!tty || tty->magic != TTY_MAGIC)
return;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return;
bd = ch->ch_bd;
if (!bd || bd->magic != DGNC_BOARD_MAGIC)
return;
ts = &tty->termios;
spin_lock_irqsave(&ch->ch_lock, flags);
/*
* Determine if this is the last close or not - and if we agree about
* which type of close it is with the Line Discipline
*/
if ((tty->count == 1) && (un->un_open_count != 1)) {
/*
* Uh, oh. tty->count is 1, which means that the tty
* structure will be freed. un_open_count should always
* be one in these conditions. If it's greater than
* one, we've got real problems, since it means the
* serial port won't be shutdown.
*/
APR(("tty->count is 1, un open count is %d\n", un->un_open_count));
un->un_open_count = 1;
}
if (un->un_open_count)
un->un_open_count--;
else
APR(("bad serial port open count of %d\n", un->un_open_count));
ch->ch_open_count--;
if (ch->ch_open_count && un->un_open_count) {
spin_unlock_irqrestore(&ch->ch_lock, flags);
return;
}
/* OK, its the last close on the unit */
un->un_flags |= UN_CLOSING;
tty->closing = 1;
/*
* Only officially close channel if count is 0 and
* DIGI_PRINTER bit is not set.
*/
if ((ch->ch_open_count == 0) && !(ch->ch_digi.digi_flags & DIGI_PRINTER)) {
ch->ch_flags &= ~(CH_STOPI | CH_FORCED_STOPI);
/*
* turn off print device when closing print device.
*/
if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) {
dgnc_wmove(ch, ch->ch_digi.digi_offstr,
(int) ch->ch_digi.digi_offlen);
ch->ch_flags &= ~CH_PRON;
}
spin_unlock_irqrestore(&ch->ch_lock, flags);
/* wait for output to drain */
/* This will also return if we take an interrupt */
rc = bd->bd_ops->drain(tty, 0);
dgnc_tty_flush_buffer(tty);
tty_ldisc_flush(tty);
spin_lock_irqsave(&ch->ch_lock, flags);
tty->closing = 0;
/*
* If we have HUPCL set, lower DTR and RTS
*/
if (ch->ch_c_cflag & HUPCL) {
/* Drop RTS/DTR */
ch->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS);
bd->bd_ops->assert_modem_signals(ch);
/*
* Go to sleep to ensure RTS/DTR
* have been dropped for modems to see it.
*/
if (ch->ch_close_delay) {
spin_unlock_irqrestore(&ch->ch_lock,
flags);
dgnc_ms_sleep(ch->ch_close_delay);
spin_lock_irqsave(&ch->ch_lock, flags);
}
}
ch->ch_old_baud = 0;
/* Turn off UART interrupts for this port */
ch->ch_bd->bd_ops->uart_off(ch);
} else {
/*
* turn off print device when closing print device.
*/
if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) {
dgnc_wmove(ch, ch->ch_digi.digi_offstr,
(int) ch->ch_digi.digi_offlen);
ch->ch_flags &= ~CH_PRON;
}
}
un->un_tty = NULL;
un->un_flags &= ~(UN_ISOPEN | UN_CLOSING);
wake_up_interruptible(&ch->ch_flags_wait);
wake_up_interruptible(&un->un_flags_wait);
spin_unlock_irqrestore(&ch->ch_lock, flags);
}
/*
* dgnc_tty_chars_in_buffer()
*
* Return number of characters that have not been transmitted yet.
*
* This routine is used by the line discipline to determine if there
* is data waiting to be transmitted/drained/flushed or not.
*/
static int dgnc_tty_chars_in_buffer(struct tty_struct *tty)
{
struct channel_t *ch = NULL;
struct un_t *un = NULL;
ushort thead;
ushort ttail;
uint tmask;
uint chars = 0;
unsigned long flags;
if (tty == NULL)
return 0;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return 0;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return 0;
spin_lock_irqsave(&ch->ch_lock, flags);
tmask = WQUEUEMASK;
thead = ch->ch_w_head & tmask;
ttail = ch->ch_w_tail & tmask;
spin_unlock_irqrestore(&ch->ch_lock, flags);
if (ttail == thead) {
chars = 0;
} else {
if (thead >= ttail)
chars = thead - ttail;
else
chars = thead - ttail + WQUEUESIZE;
}
return chars;
}
/*
* dgnc_maxcps_room
*
* Reduces bytes_available to the max number of characters
* that can be sent currently given the maxcps value, and
* returns the new bytes_available. This only affects printer
* output.
*/
static int dgnc_maxcps_room(struct tty_struct *tty, int bytes_available)
{
struct channel_t *ch = NULL;
struct un_t *un = NULL;
if (!tty)
return bytes_available;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return bytes_available;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return bytes_available;
/*
* If its not the Transparent print device, return
* the full data amount.
*/
if (un->un_type != DGNC_PRINT)
return bytes_available;
if (ch->ch_digi.digi_maxcps > 0 && ch->ch_digi.digi_bufsize > 0) {
int cps_limit = 0;
unsigned long current_time = jiffies;
unsigned long buffer_time = current_time +
(HZ * ch->ch_digi.digi_bufsize) / ch->ch_digi.digi_maxcps;
if (ch->ch_cpstime < current_time) {
/* buffer is empty */
ch->ch_cpstime = current_time; /* reset ch_cpstime */
cps_limit = ch->ch_digi.digi_bufsize;
} else if (ch->ch_cpstime < buffer_time) {
/* still room in the buffer */
cps_limit = ((buffer_time - ch->ch_cpstime) * ch->ch_digi.digi_maxcps) / HZ;
} else {
/* no room in the buffer */
cps_limit = 0;
}
bytes_available = min(cps_limit, bytes_available);
}
return bytes_available;
}
/*
* dgnc_tty_write_room()
*
* Return space available in Tx buffer
*/
static int dgnc_tty_write_room(struct tty_struct *tty)
{
struct channel_t *ch = NULL;
struct un_t *un = NULL;
ushort head;
ushort tail;
ushort tmask;
int ret = 0;
unsigned long flags;
if (tty == NULL || dgnc_TmpWriteBuf == NULL)
return 0;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return 0;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return 0;
spin_lock_irqsave(&ch->ch_lock, flags);
tmask = WQUEUEMASK;
head = (ch->ch_w_head) & tmask;
tail = (ch->ch_w_tail) & tmask;
ret = tail - head - 1;
if (ret < 0)
ret += WQUEUESIZE;
/* Limit printer to maxcps */
ret = dgnc_maxcps_room(tty, ret);
/*
* If we are printer device, leave space for
* possibly both the on and off strings.
*/
if (un->un_type == DGNC_PRINT) {
if (!(ch->ch_flags & CH_PRON))
ret -= ch->ch_digi.digi_onlen;
ret -= ch->ch_digi.digi_offlen;
} else {
if (ch->ch_flags & CH_PRON)
ret -= ch->ch_digi.digi_offlen;
}
if (ret < 0)
ret = 0;
spin_unlock_irqrestore(&ch->ch_lock, flags);
return ret;
}
/*
* dgnc_tty_put_char()
*
* Put a character into ch->ch_buf
*
* - used by the line discipline for OPOST processing
*/
static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c)
{
/*
* Simply call tty_write.
*/
dgnc_tty_write(tty, &c, 1);
return 1;
}
/*
* dgnc_tty_write()
*
* Take data from the user or kernel and send it out to the FEP.
* In here exists all the Transparent Print magic as well.
*/
static int dgnc_tty_write(struct tty_struct *tty,
const unsigned char *buf, int count)
{
struct channel_t *ch = NULL;
struct un_t *un = NULL;
int bufcount = 0, n = 0;
int orig_count = 0;
unsigned long flags;
ushort head;
ushort tail;
ushort tmask;
uint remain;
int from_user = 0;
if (tty == NULL || dgnc_TmpWriteBuf == NULL)
return 0;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return 0;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return 0;
if (!count)
return 0;
/*
* Store original amount of characters passed in.
* This helps to figure out if we should ask the FEP
* to send us an event when it has more space available.
*/
orig_count = count;
spin_lock_irqsave(&ch->ch_lock, flags);
/* Get our space available for the channel from the board */
tmask = WQUEUEMASK;
head = (ch->ch_w_head) & tmask;
tail = (ch->ch_w_tail) & tmask;
bufcount = tail - head - 1;
if (bufcount < 0)
bufcount += WQUEUESIZE;
/*
* Limit printer output to maxcps overall, with bursts allowed
* up to bufsize characters.
*/
bufcount = dgnc_maxcps_room(tty, bufcount);
/*
* Take minimum of what the user wants to send, and the
* space available in the FEP buffer.
*/
count = min(count, bufcount);
/*
* Bail if no space left.
*/
if (count <= 0) {
spin_unlock_irqrestore(&ch->ch_lock, flags);
return 0;
}
/*
* Output the printer ON string, if we are in terminal mode, but
* need to be in printer mode.
*/
if ((un->un_type == DGNC_PRINT) && !(ch->ch_flags & CH_PRON)) {
dgnc_wmove(ch, ch->ch_digi.digi_onstr,
(int) ch->ch_digi.digi_onlen);
head = (ch->ch_w_head) & tmask;
ch->ch_flags |= CH_PRON;
}
/*
* On the other hand, output the printer OFF string, if we are
* currently in printer mode, but need to output to the terminal.
*/
if ((un->un_type != DGNC_PRINT) && (ch->ch_flags & CH_PRON)) {
dgnc_wmove(ch, ch->ch_digi.digi_offstr,
(int) ch->ch_digi.digi_offlen);
head = (ch->ch_w_head) & tmask;
ch->ch_flags &= ~CH_PRON;
}
/*
* If there is nothing left to copy, or I can't handle any more data, leave.
*/
if (count <= 0) {
spin_unlock_irqrestore(&ch->ch_lock, flags);
return 0;
}
if (from_user) {
count = min(count, WRITEBUFLEN);
spin_unlock_irqrestore(&ch->ch_lock, flags);
/*
* If data is coming from user space, copy it into a temporary
* buffer so we don't get swapped out while doing the copy to
* the board.
*/
/* we're allowed to block if it's from_user */
if (down_interruptible(&dgnc_TmpWriteSem))
return -EINTR;
/*
* copy_from_user() returns the number
* of bytes that could *NOT* be copied.
*/
count -= copy_from_user(dgnc_TmpWriteBuf, (const unsigned char __user *) buf, count);
if (!count) {
up(&dgnc_TmpWriteSem);
return -EFAULT;
}
spin_lock_irqsave(&ch->ch_lock, flags);
buf = dgnc_TmpWriteBuf;
}
n = count;
/*
* If the write wraps over the top of the circular buffer,
* move the portion up to the wrap point, and reset the
* pointers to the bottom.
*/
remain = WQUEUESIZE - head;
if (n >= remain) {
n -= remain;
memcpy(ch->ch_wqueue + head, buf, remain);
dgnc_sniff_nowait_nolock(ch, "USER WRITE", ch->ch_wqueue + head, remain);
head = 0;
buf += remain;
}
if (n > 0) {
/*
* Move rest of data.
*/
remain = n;
memcpy(ch->ch_wqueue + head, buf, remain);
dgnc_sniff_nowait_nolock(ch, "USER WRITE", ch->ch_wqueue + head, remain);
head += remain;
}
if (count) {
head &= tmask;
ch->ch_w_head = head;
}
/* Update printer buffer empty time. */
if ((un->un_type == DGNC_PRINT) && (ch->ch_digi.digi_maxcps > 0)
&& (ch->ch_digi.digi_bufsize > 0)) {
ch->ch_cpstime += (HZ * count) / ch->ch_digi.digi_maxcps;
}
if (from_user) {
spin_unlock_irqrestore(&ch->ch_lock, flags);
up(&dgnc_TmpWriteSem);
} else {
spin_unlock_irqrestore(&ch->ch_lock, flags);
}
if (count) {
/*
* Channel lock is grabbed and then released
* inside this routine.
*/
ch->ch_bd->bd_ops->copy_data_from_queue_to_uart(ch);
}
return count;
}
/*
* Return modem signals to ld.
*/
static int dgnc_tty_tiocmget(struct tty_struct *tty)
{
struct channel_t *ch;
struct un_t *un;
int result = -EIO;
unsigned char mstat = 0;
unsigned long flags;
if (!tty || tty->magic != TTY_MAGIC)
return result;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return result;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return result;
spin_lock_irqsave(&ch->ch_lock, flags);
mstat = (ch->ch_mostat | ch->ch_mistat);
spin_unlock_irqrestore(&ch->ch_lock, flags);
result = 0;
if (mstat & UART_MCR_DTR)
result |= TIOCM_DTR;
if (mstat & UART_MCR_RTS)
result |= TIOCM_RTS;
if (mstat & UART_MSR_CTS)
result |= TIOCM_CTS;
if (mstat & UART_MSR_DSR)
result |= TIOCM_DSR;
if (mstat & UART_MSR_RI)
result |= TIOCM_RI;
if (mstat & UART_MSR_DCD)
result |= TIOCM_CD;
return result;
}
/*
* dgnc_tty_tiocmset()
*
* Set modem signals, called by ld.
*/
static int dgnc_tty_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct dgnc_board *bd;
struct channel_t *ch;
struct un_t *un;
int ret = -EIO;
unsigned long flags;
if (!tty || tty->magic != TTY_MAGIC)
return ret;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return ret;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return ret;
bd = ch->ch_bd;
if (!bd || bd->magic != DGNC_BOARD_MAGIC)
return ret;
spin_lock_irqsave(&ch->ch_lock, flags);
if (set & TIOCM_RTS)
ch->ch_mostat |= UART_MCR_RTS;
if (set & TIOCM_DTR)
ch->ch_mostat |= UART_MCR_DTR;
if (clear & TIOCM_RTS)
ch->ch_mostat &= ~(UART_MCR_RTS);
if (clear & TIOCM_DTR)
ch->ch_mostat &= ~(UART_MCR_DTR);
ch->ch_bd->bd_ops->assert_modem_signals(ch);
spin_unlock_irqrestore(&ch->ch_lock, flags);
return 0;
}
/*
* dgnc_tty_send_break()
*
* Send a Break, called by ld.
*/
static int dgnc_tty_send_break(struct tty_struct *tty, int msec)
{
struct dgnc_board *bd;
struct channel_t *ch;
struct un_t *un;
int ret = -EIO;
unsigned long flags;
if (!tty || tty->magic != TTY_MAGIC)
return ret;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return ret;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return ret;
bd = ch->ch_bd;
if (!bd || bd->magic != DGNC_BOARD_MAGIC)
return ret;
switch (msec) {
case -1:
msec = 0xFFFF;
break;
case 0:
msec = 0;
break;
default:
break;
}
spin_lock_irqsave(&ch->ch_lock, flags);
ch->ch_bd->bd_ops->send_break(ch, msec);
spin_unlock_irqrestore(&ch->ch_lock, flags);
return 0;
}
/*
* dgnc_tty_wait_until_sent()
*
* wait until data has been transmitted, called by ld.
*/
static void dgnc_tty_wait_until_sent(struct tty_struct *tty, int timeout)
{
struct dgnc_board *bd;
struct channel_t *ch;
struct un_t *un;
int rc;
if (!tty || tty->magic != TTY_MAGIC)
return;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return;
bd = ch->ch_bd;
if (!bd || bd->magic != DGNC_BOARD_MAGIC)
return;
rc = bd->bd_ops->drain(tty, 0);
}
/*
* dgnc_send_xchar()
*
* send a high priority character, called by ld.
*/
static void dgnc_tty_send_xchar(struct tty_struct *tty, char c)
{
struct dgnc_board *bd;
struct channel_t *ch;
struct un_t *un;
unsigned long flags;
if (!tty || tty->magic != TTY_MAGIC)
return;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return;
bd = ch->ch_bd;
if (!bd || bd->magic != DGNC_BOARD_MAGIC)
return;
dev_dbg(tty->dev, "dgnc_tty_send_xchar start\n");
spin_lock_irqsave(&ch->ch_lock, flags);
bd->bd_ops->send_immediate_char(ch, c);
spin_unlock_irqrestore(&ch->ch_lock, flags);
dev_dbg(tty->dev, "dgnc_tty_send_xchar finish\n");
}
/*
* Return modem signals to ld.
*/
static inline int dgnc_get_mstat(struct channel_t *ch)
{
unsigned char mstat;
int result = -EIO;
unsigned long flags;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return -ENXIO;
spin_lock_irqsave(&ch->ch_lock, flags);
mstat = (ch->ch_mostat | ch->ch_mistat);
spin_unlock_irqrestore(&ch->ch_lock, flags);
result = 0;
if (mstat & UART_MCR_DTR)
result |= TIOCM_DTR;
if (mstat & UART_MCR_RTS)
result |= TIOCM_RTS;
if (mstat & UART_MSR_CTS)
result |= TIOCM_CTS;
if (mstat & UART_MSR_DSR)
result |= TIOCM_DSR;
if (mstat & UART_MSR_RI)
result |= TIOCM_RI;
if (mstat & UART_MSR_DCD)
result |= TIOCM_CD;
return result;
}
/*
* Return modem signals to ld.
*/
static int dgnc_get_modem_info(struct channel_t *ch, unsigned int __user *value)
{
int result;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return -ENXIO;
result = dgnc_get_mstat(ch);
if (result < 0)
return -ENXIO;
return put_user(result, value);
}
/*
* dgnc_set_modem_info()
*
* Set modem signals, called by ld.
*/
static int dgnc_set_modem_info(struct tty_struct *tty, unsigned int command, unsigned int __user *value)
{
struct dgnc_board *bd;
struct channel_t *ch;
struct un_t *un;
int ret = -ENXIO;
unsigned int arg = 0;
unsigned long flags;
if (!tty || tty->magic != TTY_MAGIC)
return ret;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return ret;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return ret;
bd = ch->ch_bd;
if (!bd || bd->magic != DGNC_BOARD_MAGIC)
return ret;
ret = 0;
ret = get_user(arg, value);
if (ret)
return ret;
switch (command) {
case TIOCMBIS:
if (arg & TIOCM_RTS)
ch->ch_mostat |= UART_MCR_RTS;
if (arg & TIOCM_DTR)
ch->ch_mostat |= UART_MCR_DTR;
break;
case TIOCMBIC:
if (arg & TIOCM_RTS)
ch->ch_mostat &= ~(UART_MCR_RTS);
if (arg & TIOCM_DTR)
ch->ch_mostat &= ~(UART_MCR_DTR);
break;
case TIOCMSET:
if (arg & TIOCM_RTS)
ch->ch_mostat |= UART_MCR_RTS;
else
ch->ch_mostat &= ~(UART_MCR_RTS);
if (arg & TIOCM_DTR)
ch->ch_mostat |= UART_MCR_DTR;
else
ch->ch_mostat &= ~(UART_MCR_DTR);
break;
default:
return -EINVAL;
}
spin_lock_irqsave(&ch->ch_lock, flags);
ch->ch_bd->bd_ops->assert_modem_signals(ch);
spin_unlock_irqrestore(&ch->ch_lock, flags);
return 0;
}
/*
* dgnc_tty_digigeta()
*
* Ioctl to get the information for ditty.
*
*
*
*/
static int dgnc_tty_digigeta(struct tty_struct *tty, struct digi_t __user *retinfo)
{
struct channel_t *ch;
struct un_t *un;
struct digi_t tmp;
unsigned long flags;
if (!retinfo)
return -EFAULT;
if (!tty || tty->magic != TTY_MAGIC)
return -EFAULT;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return -EFAULT;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return -EFAULT;
memset(&tmp, 0, sizeof(tmp));
spin_lock_irqsave(&ch->ch_lock, flags);
memcpy(&tmp, &ch->ch_digi, sizeof(tmp));
spin_unlock_irqrestore(&ch->ch_lock, flags);
if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
return -EFAULT;
return 0;
}
/*
* dgnc_tty_digiseta()
*
* Ioctl to set the information for ditty.
*
*
*
*/
static int dgnc_tty_digiseta(struct tty_struct *tty, struct digi_t __user *new_info)
{
struct dgnc_board *bd;
struct channel_t *ch;
struct un_t *un;
struct digi_t new_digi;
unsigned long flags;
if (!tty || tty->magic != TTY_MAGIC)
return -EFAULT;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return -EFAULT;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return -EFAULT;
bd = ch->ch_bd;
if (!bd || bd->magic != DGNC_BOARD_MAGIC)
return -EFAULT;
if (copy_from_user(&new_digi, new_info, sizeof(new_digi)))
return -EFAULT;
spin_lock_irqsave(&ch->ch_lock, flags);
/*
* Handle transistions to and from RTS Toggle.
*/
if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && (new_digi.digi_flags & DIGI_RTS_TOGGLE))
ch->ch_mostat &= ~(UART_MCR_RTS);
if ((ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) && !(new_digi.digi_flags & DIGI_RTS_TOGGLE))
ch->ch_mostat |= (UART_MCR_RTS);
/*
* Handle transistions to and from DTR Toggle.
*/
if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && (new_digi.digi_flags & DIGI_DTR_TOGGLE))
ch->ch_mostat &= ~(UART_MCR_DTR);
if ((ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) && !(new_digi.digi_flags & DIGI_DTR_TOGGLE))
ch->ch_mostat |= (UART_MCR_DTR);
memcpy(&ch->ch_digi, &new_digi, sizeof(new_digi));
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;
ch->ch_bd->bd_ops->param(tty);
spin_unlock_irqrestore(&ch->ch_lock, flags);
return 0;
}
/*
* dgnc_set_termios()
*/
static void dgnc_tty_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
{
struct dgnc_board *bd;
struct channel_t *ch;
struct un_t *un;
unsigned long flags;
if (!tty || tty->magic != TTY_MAGIC)
return;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return;
bd = ch->ch_bd;
if (!bd || bd->magic != DGNC_BOARD_MAGIC)
return;
spin_lock_irqsave(&ch->ch_lock, flags);
ch->ch_c_cflag = tty->termios.c_cflag;
ch->ch_c_iflag = tty->termios.c_iflag;
ch->ch_c_oflag = tty->termios.c_oflag;
ch->ch_c_lflag = tty->termios.c_lflag;
ch->ch_startc = tty->termios.c_cc[VSTART];
ch->ch_stopc = tty->termios.c_cc[VSTOP];
ch->ch_bd->bd_ops->param(tty);
dgnc_carrier(ch);
spin_unlock_irqrestore(&ch->ch_lock, flags);
}
static void dgnc_tty_throttle(struct tty_struct *tty)
{
struct channel_t *ch;
struct un_t *un;
unsigned long flags;
if (!tty || tty->magic != TTY_MAGIC)
return;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return;
spin_lock_irqsave(&ch->ch_lock, flags);
ch->ch_flags |= (CH_FORCED_STOPI);
spin_unlock_irqrestore(&ch->ch_lock, flags);
}
static void dgnc_tty_unthrottle(struct tty_struct *tty)
{
struct channel_t *ch;
struct un_t *un;
unsigned long flags;
if (!tty || tty->magic != TTY_MAGIC)
return;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return;
spin_lock_irqsave(&ch->ch_lock, flags);
ch->ch_flags &= ~(CH_FORCED_STOPI);
spin_unlock_irqrestore(&ch->ch_lock, flags);
}
static void dgnc_tty_start(struct tty_struct *tty)
{
struct dgnc_board *bd;
struct channel_t *ch;
struct un_t *un;
unsigned long flags;
if (!tty || tty->magic != TTY_MAGIC)
return;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return;
bd = ch->ch_bd;
if (!bd || bd->magic != DGNC_BOARD_MAGIC)
return;
spin_lock_irqsave(&ch->ch_lock, flags);
ch->ch_flags &= ~(CH_FORCED_STOP);
spin_unlock_irqrestore(&ch->ch_lock, flags);
}
static void dgnc_tty_stop(struct tty_struct *tty)
{
struct dgnc_board *bd;
struct channel_t *ch;
struct un_t *un;
unsigned long flags;
if (!tty || tty->magic != TTY_MAGIC)
return;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return;
bd = ch->ch_bd;
if (!bd || bd->magic != DGNC_BOARD_MAGIC)
return;
spin_lock_irqsave(&ch->ch_lock, flags);
ch->ch_flags |= (CH_FORCED_STOP);
spin_unlock_irqrestore(&ch->ch_lock, flags);
}
/*
* dgnc_tty_flush_chars()
*
* Flush the cook buffer
*
* Note to self, and any other poor souls who venture here:
*
* flush in this case DOES NOT mean dispose of the data.
* instead, it means "stop buffering and send it if you
* haven't already." Just guess how I figured that out... SRW 2-Jun-98
*
* It is also always called in interrupt context - JAR 8-Sept-99
*/
static void dgnc_tty_flush_chars(struct tty_struct *tty)
{
struct dgnc_board *bd;
struct channel_t *ch;
struct un_t *un;
unsigned long flags;
if (!tty || tty->magic != TTY_MAGIC)
return;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return;
bd = ch->ch_bd;
if (!bd || bd->magic != DGNC_BOARD_MAGIC)
return;
spin_lock_irqsave(&ch->ch_lock, flags);
/* Do something maybe here */
spin_unlock_irqrestore(&ch->ch_lock, flags);
}
/*
* dgnc_tty_flush_buffer()
*
* Flush Tx buffer (make in == out)
*/
static void dgnc_tty_flush_buffer(struct tty_struct *tty)
{
struct channel_t *ch;
struct un_t *un;
unsigned long flags;
if (!tty || tty->magic != TTY_MAGIC)
return;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return;
spin_lock_irqsave(&ch->ch_lock, flags);
ch->ch_flags &= ~CH_STOP;
/* Flush our write queue */
ch->ch_w_head = ch->ch_w_tail;
/* Flush UARTs transmit FIFO */
ch->ch_bd->bd_ops->flush_uart_write(ch);
if (ch->ch_tun.un_flags & (UN_LOW|UN_EMPTY)) {
ch->ch_tun.un_flags &= ~(UN_LOW|UN_EMPTY);
wake_up_interruptible(&ch->ch_tun.un_flags_wait);
}
if (ch->ch_pun.un_flags & (UN_LOW|UN_EMPTY)) {
ch->ch_pun.un_flags &= ~(UN_LOW|UN_EMPTY);
wake_up_interruptible(&ch->ch_pun.un_flags_wait);
}
spin_unlock_irqrestore(&ch->ch_lock, flags);
}
/*****************************************************************************
*
* The IOCTL function and all of its helpers
*
*****************************************************************************/
/*
* dgnc_tty_ioctl()
*
* The usual assortment of ioctl's
*/
static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
unsigned long arg)
{
struct dgnc_board *bd;
struct channel_t *ch;
struct un_t *un;
int rc;
unsigned long flags;
void __user *uarg = (void __user *) arg;
if (!tty || tty->magic != TTY_MAGIC)
return -ENODEV;
un = tty->driver_data;
if (!un || un->magic != DGNC_UNIT_MAGIC)
return -ENODEV;
ch = un->un_ch;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return -ENODEV;
bd = ch->ch_bd;
if (!bd || bd->magic != DGNC_BOARD_MAGIC)
return -ENODEV;
spin_lock_irqsave(&ch->ch_lock, flags);
if (un->un_open_count <= 0) {
spin_unlock_irqrestore(&ch->ch_lock, flags);
return -EIO;
}
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 so we'll ask for something
* in the middle: 0.375 seconds.
*/
rc = tty_check_change(tty);
spin_unlock_irqrestore(&ch->ch_lock, flags);
if (rc)
return rc;
rc = ch->ch_bd->bd_ops->drain(tty, 0);
if (rc)
return -EINTR;
spin_lock_irqsave(&ch->ch_lock, flags);
if (((cmd == TCSBRK) && (!arg)) || (cmd == TCSBRKP))
ch->ch_bd->bd_ops->send_break(ch, 250);
spin_unlock_irqrestore(&ch->ch_lock, flags);
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);
spin_unlock_irqrestore(&ch->ch_lock, flags);
if (rc)
return rc;
rc = ch->ch_bd->bd_ops->drain(tty, 0);
if (rc)
return -EINTR;
spin_lock_irqsave(&ch->ch_lock, flags);
ch->ch_bd->bd_ops->send_break(ch, 250);
spin_unlock_irqrestore(&ch->ch_lock, flags);
return 0;
case TIOCSBRK:
rc = tty_check_change(tty);
spin_unlock_irqrestore(&ch->ch_lock, flags);
if (rc)
return rc;
rc = ch->ch_bd->bd_ops->drain(tty, 0);
if (rc)
return -EINTR;
spin_lock_irqsave(&ch->ch_lock, flags);
ch->ch_bd->bd_ops->send_break(ch, 250);
spin_unlock_irqrestore(&ch->ch_lock, flags);
return 0;
case TIOCCBRK:
/* Do Nothing */
spin_unlock_irqrestore(&ch->ch_lock, flags);
return 0;
case TIOCGSOFTCAR:
spin_unlock_irqrestore(&ch->ch_lock, flags);
rc = put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long __user *) arg);
return rc;
case TIOCSSOFTCAR:
spin_unlock_irqrestore(&ch->ch_lock, flags);
rc = get_user(arg, (unsigned long __user *) arg);
if (rc)
return rc;
spin_lock_irqsave(&ch->ch_lock, flags