Release 4.11 drivers/staging/dgnc/dgnc_tty.c
/*
* 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.
*/
/*
* This file implements the tty driver functionality for the
* Neo and ClassicBoard PCI based product lines.
*/
#include <linux/kernel.h>
#include <linux/sched/signal.h> /* For jiffies, task states, etc. */
#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/types.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_neo.h"
#include "dgnc_cls.h"
#include "dgnc_utils.h"
/* Default transparent print information. */
static const 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 default_termios = {
.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 channel_t *ch, 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 void dgnc_set_signal_low(struct channel_t *ch, const unsigned char line);
static void dgnc_wake_up_unit(struct un_t *unit);
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_register()
*
* Init the tty subsystem for this board.
*/
int dgnc_tty_register(struct dgnc_board *brd)
{
int rc;
brd->serial_driver = tty_alloc_driver(brd->maxports,
TTY_DRIVER_REAL_RAW |
TTY_DRIVER_DYNAMIC_DEV |
TTY_DRIVER_HARDWARE_BREAK);
if (IS_ERR(brd->serial_driver))
return PTR_ERR(brd->serial_driver);
snprintf(brd->serial_name, MAXTTYNAMELEN, "tty_dgnc_%d_",
brd->boardnum);
brd->serial_driver->name = brd->serial_name;
brd->serial_driver->name_base = 0;
brd->serial_driver->major = 0;
brd->serial_driver->minor_start = 0;
brd->serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
brd->serial_driver->subtype = SERIAL_TYPE_NORMAL;
brd->serial_driver->init_termios = default_termios;
brd->serial_driver->driver_name = DRVSTR;
/*
* Entry points for driver. Called by the kernel from
* tty_io.c and n_tty.c.
*/
tty_set_operations(brd->serial_driver, &dgnc_tty_ops);
rc = tty_register_driver(brd->serial_driver);
if (rc < 0) {
dev_dbg(&brd->pdev->dev,
"Can't register tty device (%d)\n", rc);
goto free_serial_driver;
}
/*
* 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->print_driver = tty_alloc_driver(brd->maxports,
TTY_DRIVER_REAL_RAW |
TTY_DRIVER_DYNAMIC_DEV |
TTY_DRIVER_HARDWARE_BREAK);
if (IS_ERR(brd->print_driver)) {
rc = PTR_ERR(brd->print_driver);
goto unregister_serial_driver;
}
snprintf(brd->print_name, MAXTTYNAMELEN, "pr_dgnc_%d_", brd->boardnum);
brd->print_driver->name = brd->print_name;
brd->print_driver->name_base = 0;
brd->print_driver->major = brd->serial_driver->major;
brd->print_driver->minor_start = 0x80;
brd->print_driver->type = TTY_DRIVER_TYPE_SERIAL;
brd->print_driver->subtype = SERIAL_TYPE_NORMAL;
brd->print_driver->init_termios = default_termios;
brd->print_driver->driver_name = DRVSTR;
/*
* Entry points for driver. Called by the kernel from
* tty_io.c and n_tty.c.
*/
tty_set_operations(brd->print_driver, &dgnc_tty_ops);
rc = tty_register_driver(brd->print_driver);
if (rc < 0) {
dev_dbg(&brd->pdev->dev,
"Can't register Transparent Print device(%d)\n",
rc);
goto free_print_driver;
}
return 0;
free_print_driver:
put_tty_driver(brd->print_driver);
unregister_serial_driver:
tty_unregister_driver(brd->serial_driver);
free_serial_driver:
put_tty_driver(brd->serial_driver);
return rc;
}
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| Lidza Louina | 223 | 59.15% | 2 | 22.22% |
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| Roberta Dobrescu | 19 | 5.04% | 1 | 11.11% |
| Pankaj Bharadiya | 2 | 0.53% | 1 | 11.11% |
| Masanari Iida | 1 | 0.27% | 1 | 11.11% |
| Total | 377 | 100.00% | 9 | 100.00% |
void dgnc_tty_unregister(struct dgnc_board *brd)
{
tty_unregister_driver(brd->print_driver);
tty_unregister_driver(brd->serial_driver);
put_tty_driver(brd->print_driver);
put_tty_driver(brd->serial_driver);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| DaeSeok Youn | 38 | 100.00% | 1 | 100.00% |
| Total | 38 | 100.00% | 1 | 100.00% |
/*
* 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;
for (i = 0; i < brd->nasync; 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);
if (!brd->channels[i])
goto err_free_channels;
}
ch = brd->channels[0];
vaddr = brd->re_map_membase;
/* Set up channel variables */
for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) {
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);
{
struct device *classp;
classp = tty_register_device(brd->serial_driver, i,
&ch->ch_bd->pdev->dev);
ch->ch_tun.un_sysfs = classp;
classp = tty_register_device(brd->print_driver, i,
&ch->ch_bd->pdev->dev);
ch->ch_pun.un_sysfs = classp;
}
}
return 0;
err_free_channels:
for (i = i - 1; i >= 0; --i) {
kfree(brd->channels[i]);
brd->channels[i] = NULL;
}
return -ENOMEM;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 361 | 85.55% | 6 | 60.00% |
| Giedrius Statkevičius | 56 | 13.27% | 1 | 10.00% |
| Roberta Dobrescu | 2 | 0.47% | 1 | 10.00% |
| DaeSeok Youn | 2 | 0.47% | 1 | 10.00% |
| Walt Feasel | 1 | 0.24% | 1 | 10.00% |
| Total | 422 | 100.00% | 10 | 100.00% |
/*
* dgnc_cleanup_tty()
*
* Uninitialize the TTY portion of this driver. Free all memory and
* resources.
*/
void dgnc_cleanup_tty(struct dgnc_board *brd)
{
int i = 0;
for (i = 0; i < brd->nasync; i++)
tty_unregister_device(brd->serial_driver, i);
tty_unregister_driver(brd->serial_driver);
for (i = 0; i < brd->nasync; i++)
tty_unregister_device(brd->print_driver, i);
tty_unregister_driver(brd->print_driver);
put_tty_driver(brd->serial_driver);
put_tty_driver(brd->print_driver);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 77 | 84.62% | 2 | 33.33% |
| DaeSeok Youn | 9 | 9.89% | 3 | 50.00% |
| Hari Prasath Gujulan Elango | 5 | 5.49% | 1 | 16.67% |
| Total | 91 | 100.00% | 6 | 100.00% |
/*
* dgnc_wmove - Write data to transmit queue.
*
* ch - Pointer to channel structure.
* buf - Pointer 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 123 | 99.19% | 1 | 50.00% |
| Walt Feasel | 1 | 0.81% | 1 | 50.00% |
| Total | 124 | 100.00% | 2 | 100.00% |
/*
* 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 = NULL;
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)
goto exit_unlock;
/*
* 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) ||
!C_CREAD(tp) ||
(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);
goto exit_unlock;
}
/* If we are throttled, simply don't read any data. */
if (ch->ch_flags & CH_FORCED_STOPI)
goto exit_unlock;
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);
/*
* 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)
goto exit_unlock;
/*
* 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) {
unsigned char *ch_pos = ch->ch_equeue + tail;
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++) {
unsigned char ch = *(ch_pos + i);
char flag = TTY_NORMAL;
if (ch & UART_LSR_BI)
flag = TTY_BREAK;
else if (ch & UART_LSR_PE)
flag = TTY_PARITY;
else if (ch & UART_LSR_FE)
flag = TTY_FRAME;
tty_insert_flip_char(tp->port, ch, flag);
}
} else {
tty_insert_flip_string(tp->port, ch_pos, 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);
return;
exit_unlock:
spin_unlock_irqrestore(&ch->ch_lock, flags);
if (ld)
tty_ldisc_deref(ld);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 485 | 86.15% | 6 | 50.00% |
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| Roberta Dobrescu | 9 | 1.60% | 1 | 8.33% |
| Peter Hurley | 3 | 0.53% | 1 | 8.33% |
| Walt Feasel | 1 | 0.18% | 1 | 8.33% |
| Total | 563 | 100.00% | 12 | 100.00% |
/*
* Determines when CARRIER changes state and takes appropriate
* action.
*/
void dgnc_carrier(struct channel_t *ch)
{
int virt_carrier = 0;
int phys_carrier = 0;
if (!ch || ch->magic != DGNC_CHANNEL_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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 278 | 98.93% | 1 | 50.00% |
| Walt Feasel | 3 | 1.07% | 1 | 50.00% |
| Total | 281 | 100.00% | 2 | 100.00% |
/* 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 173 | 93.51% | 2 | 50.00% |
| DaeSeok Youn | 11 | 5.95% | 1 | 25.00% |
| Cristina Moraru | 1 | 0.54% | 1 | 25.00% |
| Total | 185 | 100.00% | 4 | 100.00% |
void dgnc_check_queue_flow_control(struct channel_t *ch)
{
int qleft;
/* 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++;
}
}
}
/*
* 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);
}
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 227 | 98.27% | 1 | 50.00% |
| Chi Pham | 4 | 1.73% | 1 | 50.00% |
| Total | 231 | 100.00% | 2 | 100.00% |
static void dgnc_set_signal_low(struct channel_t *ch, const unsigned char sig)
{
ch->ch_mostat &= ~(sig);
ch->ch_bd->bd_ops->assert_modem_signals(ch);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Fernando Apesteguia | 36 | 100.00% | 1 | 100.00% |
| Total | 36 | 100.00% | 1 | 100.00% |
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) {
tty_wakeup(ch->ch_tun.un_tty);
/*
* 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)
dgnc_set_signal_low(ch, UART_MCR_RTS);
/*
* 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)
dgnc_set_signal_low(ch, UART_MCR_DTR);
}
}
wake_up_interruptible(&ch->ch_tun.un_flags_wait);
}
if (ch->ch_pun.un_flags & UN_ISOPEN) {
tty_wakeup(ch->ch_pun.un_tty);
/*
* 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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 264 | 91.35% | 1 | 16.67% |
| Roberta Dobrescu | 12 | 4.15% | 1 | 16.67% |
| Fernando Apesteguia | 6 | 2.08% | 1 | 16.67% |
| Chi Pham | 4 | 1.38% | 1 | 16.67% |
| Peter Hurley | 2 | 0.69% | 1 | 16.67% |
| Walt Feasel | 1 | 0.35% | 1 | 16.67% |
| Total | 289 | 100.00% | 6 | 100.00% |
static struct dgnc_board *find_board_by_major(unsigned int major)
{
int i;
for (i = 0; i < MAXBOARDS; i++) {
struct dgnc_board *brd = dgnc_board[i];
if (!brd)
return NULL;
if (major == brd->serial_driver->major ||
major == brd->print_driver->major)
return brd;
}
return NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| DaeSeok Youn | 71 | 98.61% | 1 | 50.00% |
| Benoit Hiller | 1 | 1.39% | 1 | 50.00% |
| Total | 72 | 100.00% | 2 | 100.00% |
/* 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 = find_board_by_major(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);
if (!ch->ch_rqueue || !ch->ch_equeue || !ch->ch_wqueue) {
kfree(ch->ch_rqueue);
kfree(ch->ch_equeue);
kfree(ch->ch_wqueue);
return -ENOMEM;
}
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 759 | 87.64% | 4 | 36.36% |
| DaeSeok Youn | 47 | 5.43% | 2 | 18.18% |
| Roberta Dobrescu | 42 | 4.85% | 1 | 9.09% |
| SeungHun Lee | 12 | 1.39% | 2 | 18.18% |
| Walt Feasel | 5 | 0.58% | 1 | 9.09% |
| Dan Carpenter | 1 | 0.12% | 1 | 9.09% |
| Total | 866 | 100.00% | 11 | 100.00% |
/*
* 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 = tty->driver_data;
unsigned long flags;
uint old_flags = 0;
int sleep_on_un_flags = 0;
if (!file)
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_io_error(tty)) {
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);
return retval;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 301 | 92.62% | 2 | 28.57% |
| Roberta Dobrescu | 15 | 4.62% | 1 | 14.29% |
| Peter Hurley | 3 | 0.92% | 1 | 14.29% |
| DaeSeok Youn | 3 | 0.92% | 1 | 14.29% |
| Cristina Moraru | 2 | 0.62% | 1 | 14.29% |
| Walt Feasel | 1 | 0.31% | 1 | 14.29% |
| Total | 325 | 100.00% | 7 | 100.00% |
/*
* 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)
{
if (!tty || tty->magic != TTY_MAGIC)
return;
/* flush the transmit queues */
dgnc_tty_flush_buffer(tty);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 29 | 100.00% | 1 | 100.00% |
| Total | 29 | 100.00% | 1 | 100.00% |
/* dgnc_tty_close() */
static void dgnc_tty_close(struct tty_struct *tty, struct file *file)
{
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);
/*
* 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.
*/
dev_dbg(tty->dev,
"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
dev_dbg(tty->dev,
"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 */
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 485 | 91.51% | 4 | 50.00% |
| Roberta Dobrescu | 36 | 6.79% | 2 | 25.00% |
| DaeSeok Youn | 6 | 1.13% | 1 | 12.50% |
| Walt Feasel | 3 | 0.57% | 1 | 12.50% |
| Total | 530 | 100.00% | 8 | 100.00% |
/*
* 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)
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 160 | 94.12% | 1 | 33.33% |
| Roberta Dobrescu | 9 | 5.29% | 1 | 33.33% |
| Sudip Mukherjee | 1 | 0.59% | 1 | 33.33% |
| Total | 170 | 100.00% | 3 | 100.00% |
/*
* 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 channel_t *ch, int 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 143 | 98.62% | 1 | 50.00% |
| DaeSeok Youn | 2 | 1.38% | 1 | 50.00% |
| Total | 145 | 100.00% | 2 | 100.00% |
/*
* 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)
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 */
if (un->un_type != DGNC_PRINT)
ret = dgnc_maxcps_room(ch, 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 218 | 90.46% | 2 | 33.33% |
| DaeSeok Youn | 9 | 3.73% | 1 | 16.67% |
| Roberta Dobrescu | 9 | 3.73% | 1 | 16.67% |
| Chi Pham | 4 | 1.66% | 1 | 16.67% |
| Sudip Mukherjee | 1 | 0.41% | 1 | 16.67% |
| Total | 241 | 100.00% | 6 | 100.00% |
/*
* 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 28 | 96.55% | 1 | 50.00% |
| Walt Feasel | 1 | 3.45% | 1 | 50.00% |
| Total | 29 | 100.00% | 2 | 100.00% |
/*
* 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;
unsigned long flags;
ushort head;
ushort tail;
ushort tmask;
uint remain;
if (!tty)
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.
*/
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.
*/
if (un->un_type != DGNC_PRINT)
bufcount = dgnc_maxcps_room(ch, 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)
goto exit_retry;
/*
* 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;
}
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);
head = 0;
buf += remain;
}
if (n > 0) {
/* Move rest of data. */
remain = n;
memcpy(ch->ch_wqueue + head, buf, 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;
}
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;
exit_retry:
spin_unlock_irqrestore(&ch->ch_lock, flags);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 465 | 91.54% | 1 | 14.29% |
| Quentin Lambert | 18 | 3.54% | 1 | 14.29% |
| DaeSeok Youn | 9 | 1.77% | 1 | 14.29% |
| Roberta Dobrescu | 9 | 1.77% | 1 | 14.29% |
| Chi Pham | 4 | 0.79% | 1 | 14.29% |
| Walt Feasel | 2 | 0.39% | 1 | 14.29% |
| Sudip Mukherjee | 1 | 0.20% | 1 | 14.29% |
| Total | 508 | 100.00% | 7 | 100.00% |
/* 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 177 | 94.15% | 2 | 50.00% |
| Roberta Dobrescu | 9 | 4.79% | 1 | 25.00% |
| Ebru Akagunduz | 2 | 1.06% | 1 | 25.00% |
| Total | 188 | 100.00% | 4 | 100.00% |
/*
* 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 197 | 95.63% | 3 | 75.00% |
| Roberta Dobrescu | 9 | 4.37% | 1 | 25.00% |
| Total | 206 | 100.00% | 4 | 100.00% |
/*
* 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 165 | 94.83% | 2 | 66.67% |
| Roberta Dobrescu | 9 | 5.17% | 1 | 33.33% |
| Total | 174 | 100.00% | 3 | 100.00% |
/*
* 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;
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;
bd->bd_ops->drain(tty, 0);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 106 | 100.00% | 2 | 100.00% |
| Total | 106 | 100.00% | 2 | 100.00% |
/*
* 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");
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 129 | 87.16% | 2 | 50.00% |
| Roberta Dobrescu | 19 | 12.84% | 2 | 50.00% |
| Total | 148 | 100.00% | 4 | 100.00% |
/* Return modem signals to ld. */
static inline int dgnc_get_mstat(struct channel_t *ch)
{
unsigned char mstat;
int result = 0;
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);
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 123 | 92.48% | 1 | 33.33% |
| Roberta Dobrescu | 9 | 6.77% | 1 | 33.33% |
| DaeSeok Youn | 1 | 0.75% | 1 | 33.33% |
| Total | 133 | 100.00% | 3 | 100.00% |
/* Return modem signals to ld. */
static int dgnc_get_modem_info(struct channel_t *ch,
unsigned int __user *value)
{
return put_user(dgnc_get_mstat(ch), value);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 24 | 85.71% | 1 | 33.33% |
| SeungHun Lee | 2 | 7.14% | 1 | 33.33% |
| DaeSeok Youn | 2 | 7.14% | 1 | 33.33% |
| Total | 28 | 100.00% | 3 | 100.00% |
/*
* dgnc_set_modem_info()
*
* Set modem signals, called by ld.
*/
static int dgnc_set_modem_info(struct channel_t *ch,
unsigned int command,
unsigned int __user *value)
{
int ret = -ENXIO;
unsigned int arg = 0;
unsigned long flags;
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 197 | 94.71% | 1 | 33.33% |
| Roberta Dobrescu | 9 | 4.33% | 1 | 33.33% |
| DaeSeok Youn | 2 | 0.96% | 1 | 33.33% |
| Total | 208 | 100.00% | 3 | 100.00% |
/*
* 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 164 | 94.80% | 1 | 50.00% |
| Roberta Dobrescu | 9 | 5.20% | 1 | 50.00% |
| Total | 173 | 100.00% | 2 | 100.00% |
/*
* 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 transitions 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 transitions 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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 430 | 97.51% | 3 | 60.00% |
| Roberta Dobrescu | 9 | 2.04% | 1 | 20.00% |
| Walt Feasel | 2 | 0.45% | 1 | 20.00% |
| Total | 441 | 100.00% | 5 | 100.00% |
/* 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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 196 | 96.55% | 3 | 75.00% |
| Roberta Dobrescu | 7 | 3.45% | 1 | 25.00% |
| Total | 203 | 100.00% | 4 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 92 | 91.09% | 1 | 50.00% |
| Roberta Dobrescu | 9 | 8.91% | 1 | 50.00% |
| Total | 101 | 100.00% | 2 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 93 | 91.18% | 1 | 50.00% |
| Roberta Dobrescu | 9 | 8.82% | 1 | 50.00% |
| Total | 102 | 100.00% | 2 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 116 | 92.80% | 2 | 66.67% |
| Roberta Dobrescu | 9 | 7.20% | 1 | 33.33% |
| Total | 125 | 100.00% | 3 | 100.00% |
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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 115 | 92.74% | 2 | 66.67% |
| Roberta Dobrescu | 9 | 7.26% | 1 | 33.33% |
| Total | 124 | 100.00% | 3 | 100.00% |
/*
* 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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 108 | 92.31% | 2 | 66.67% |
| Roberta Dobrescu | 9 | 7.69% | 1 | 33.33% |
| Total | 117 | 100.00% | 3 | 100.00% |
/*
* 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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 190 | 95.48% | 1 | 50.00% |
| Roberta Dobrescu | 9 | 4.52% | 1 | 50.00% |
| Total | 199 | 100.00% | 2 | 100.00% |
/*
* dgnc_wake_up_unit()
*
* Wakes up processes waiting in the unit's (teminal/printer) wait queue
*/
static void dgnc_wake_up_unit(struct un_t *unit)
{
unit->un_flags &= ~(UN_LOW | UN_EMPTY);
wake_up_interruptible(&unit->un_flags_wait);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Fernando Apesteguia | 30 | 100.00% | 1 | 100.00% |
| Total | 30 | 100.00% | 1 | 100.00% |
/* 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 board_ops *ch_bd_ops;
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;
ch_bd_ops = bd->bd_ops;
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_bd_ops->drain(tty, 0);
if (rc)
return -EINTR;
spin_lock_irqsave(&ch->ch_lock, flags);
if (((cmd == TCSBRK) && (!arg)) || (cmd == TCSBRKP))
ch_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_bd_ops->drain(tty, 0);
if (rc)
return -EINTR;
spin_lock_irqsave(&ch->ch_lock, flags);
ch_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_bd_ops->drain(tty, 0);
if (rc)
return -EINTR;
spin_lock_irqsave(&ch->ch_lock, flags);
ch_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);
return put_user(C_CLOCAL(tty) ? 1 : 0,
(unsigned long __user *)arg);
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);
tty->termios.c_cflag = ((tty->termios.c_cflag & ~CLOCAL) |
(arg ? CLOCAL : 0));
ch_bd_ops->param(tty);
spin_unlock_irqrestore(&ch->ch_lock, flags);
return 0;
case TIOCMGET:
spin_unlock_irqrestore(&ch->ch_lock, flags);
return dgnc_get_modem_info(ch, uarg);
case TIOCMBIS:
case TIOCMBIC:
case TIOCMSET:
spin_unlock_irqrestore(&ch->ch_lock, flags);
return dgnc_set_modem_info(ch, cmd, uarg);
/* 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) {
spin_unlock_irqrestore(&ch->ch_lock, flags);
return rc;
}
if ((arg == TCIFLUSH) || (arg == TCIOFLUSH)) {
ch->ch_r_head = ch->ch_r_tail;
ch_bd_ops->flush_uart_read(ch);
/* Force queue flow control to be released, if needed */
dgnc_check_queue_flow_control(ch);
}
if ((arg == TCOFLUSH) || (arg == TCIOFLUSH)) {
if (!(un->un_type == DGNC_PRINT)) {
ch->ch_w_head = ch->ch_w_tail;
ch_bd_ops->flush_uart_write(ch);
if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY))
dgnc_wake_up_unit(&ch->ch_tun);
if (ch->ch_pun.un_flags & (UN_LOW | UN_EMPTY))
dgnc_wake_up_unit(&ch->ch_pun);
}
}
/* pretend we didn't recognize this IOCTL */
spin_unlock_irqrestore(&ch->ch_lock, flags);
return -ENOIOCTLCMD;
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.
*/
if (cmd == TCSETSF) {
/* flush rx */
ch->ch_flags &= ~CH_STOP;
ch->ch_r_head = ch->ch_r_tail;
ch_bd_ops->flush_uart_read(ch);
/* Force queue flow control to be released, if needed */
dgnc_check_queue_flow_control(ch);
}
/* now wait for all the output to drain */
spin_unlock_irqrestore(&ch->ch_lock, flags);
rc = ch_bd_ops->drain(tty, 0);
if (rc)
return -EINTR;
/* pretend we didn't recognize this */
return -ENOIOCTLCMD;
case TCSETAW:
spin_unlock_irqrestore(&ch->ch_lock, flags);
rc = ch_bd_ops->drain(tty, 0);
if (rc)
return -EINTR;
/* pretend we didn't recognize this */
return -ENOIOCTLCMD;
case TCXONC:
spin_unlock_irqrestore(&ch->ch_lock, flags);
/* Make the ld do it */
return -ENOIOCTLCMD;
case DIGI_GETA:
/* get information for ditty */
spin_unlock_irqrestore(&ch->ch_lock, flags);
return dgnc_tty_digigeta(tty, uarg);
case DIGI_SETAW:
case DIGI_SETAF:
/* set information for ditty */
if (cmd == (DIGI_SETAW)) {
spin_unlock_irqrestore(&ch->ch_lock, flags);
rc = ch_bd_ops->drain(tty, 0);
if (rc)
return -EINTR;
spin_lock_irqsave(&ch->ch_lock, flags);
} else {
tty_ldisc_flush(tty);
}
/* fall thru */
case DIGI_SETA:
spin_unlock_irqrestore(&ch->ch_lock, flags);
return dgnc_tty_digiseta(tty, uarg);
case DIGI_LOOPBACK:
{
uint loopback = 0;
/*
* Let go of locks when accessing user space,
* could sleep
*/
spin_unlock_irqrestore(&ch->ch_lock, flags);
rc = get_user(loopback, (unsigned int __user *)arg);
if (rc)
return rc;
spin_lock_irqsave(&ch->ch_lock, flags);
/* Enable/disable internal loopback for this port */
if (loopback)
ch->ch_flags |= CH_LOOPBACK;
else
ch->ch_flags &= ~(CH_LOOPBACK);
ch_bd_ops->param(tty);
spin_unlock_irqrestore(&ch->ch_lock, flags);
return 0;
}
case DIGI_GETCUSTOMBAUD:
spin_unlock_irqrestore(&ch->ch_lock, flags);
return put_user(ch->ch_custom_speed,
(unsigned int __user *)arg);
case DIGI_SETCUSTOMBAUD:
{
int new_rate;
/* Let go of locks when accessing user space, could sleep */
spin_unlock_irqrestore(&ch->ch_lock, flags);
rc = get_user(new_rate, (int __user *)arg);
if (rc)
return rc;
spin_lock_irqsave(&ch->ch_lock, flags);
dgnc_set_custom_speed(ch, new_rate);
ch_bd_ops->param(tty);
spin_unlock_irqrestore(&ch->ch_lock, flags);
return 0;
}
/*
* This ioctl allows insertion of a character into the front
* of any pending data to be transmitted.
*
* This ioctl is to satisfy the "Send Character Immediate"
* call that the RealPort protocol spec requires.
*/
case DIGI_REALPORT_SENDIMMEDIATE:
{
unsigned char c;
spin_unlock_irqrestore(&ch->ch_lock, flags);
rc = get_user(c, (unsigned char __user *)arg);
if (rc)
return rc;
spin_lock_irqsave(&ch->ch_lock, flags);
ch_bd_ops->send_immediate_char(ch, c);
spin_unlock_irqrestore(&ch->ch_lock, flags);
return 0;
}
/*
* This ioctl returns all the current counts for the port.
*
* This ioctl is to satisfy the "Line Error Counters"
* call that the RealPort protocol spec requires.
*/
case DIGI_REALPORT_GETCOUNTERS:
{
struct digi_getcounter buf;
buf.norun = ch->ch_err_overrun;
buf.noflow = 0; /* The driver doesn't keep this stat */
buf.nframe = ch->ch_err_frame;
buf.nparity = ch->ch_err_parity;
buf.nbreak = ch->ch_err_break;
buf.rbytes = ch->ch_rxcount;
buf.tbytes = ch->ch_txcount;
spin_unlock_irqrestore(&ch->ch_lock, flags);
if (copy_to_user(uarg, &buf, sizeof(buf)))
return -EFAULT;
return 0;
}
/*
* This ioctl returns all current events.
*
* This ioctl is to satisfy the "Event Reporting"
* call that the RealPort protocol spec requires.
*/
case DIGI_REALPORT_GETEVENTS:
{
unsigned int events = 0;
/* NOTE: MORE EVENTS NEEDS TO BE ADDED HERE */
if (ch->ch_flags & CH_BREAK_SENDING)
events |= EV_TXB;
if ((ch->ch_flags & CH_STOP) ||
(ch->ch_flags & CH_FORCED_STOP))
events |= (EV_OPU | EV_OPS);
if ((ch->ch_flags & CH_STOPI) ||
(ch->ch_flags & CH_FORCED_STOPI))
events |= (EV_IPU | EV_IPS);
spin_unlock_irqrestore(&ch->ch_lock, flags);
return put_user(events, (unsigned int __user *)arg);
}
/*
* This ioctl returns TOUT and TIN counters based
* upon the values passed in by the RealPort Server.
* It also passes back whether the UART Transmitter is
* empty as well.
*/
case DIGI_REALPORT_GETBUFFERS:
{
struct digi_getbuffer buf;
int tdist;
int count;
spin_unlock_irqrestore(&ch->ch_lock, flags);
/* Get data from user first. */
if (copy_from_user(&buf, uarg, sizeof(buf)))
return -EFAULT;
spin_lock_irqsave(&ch->ch_lock, flags);
/* Figure out how much data is in our RX and TX queues. */
buf.rxbuf = (ch->ch_r_head - ch->ch_r_tail) & RQUEUEMASK;
buf.txbuf = (ch->ch_w_head - ch->ch_w_tail) & WQUEUEMASK;
/*
* Is the UART empty?
* Add that value to whats in our TX queue.
*/
count = buf.txbuf + ch_bd_ops->get_uart_bytes_left(ch);
/*
* Figure out how much data the RealPort Server believes should
* be in our TX queue.
*/
tdist = (buf.tx_in - buf.tx_out) & 0xffff;
/*
* If we have more data than the RealPort Server believes we
* should have, reduce our count to its amount.
*
* This count difference CAN happen because the Linux LD can
* insert more characters into our queue for OPOST processing
* that the RealPort Server doesn't know about.
*/
if (buf.txbuf > tdist)
buf.txbuf = tdist;
/* Report whether our queue and UART TX are completely empty. */
if (count)
buf.txdone = 0;
else
buf.txdone = 1;
spin_unlock_irqrestore(&ch->ch_lock, flags);
if (copy_to_user(uarg, &buf, sizeof(buf)))
return -EFAULT;
return 0;
}
default:
spin_unlock_irqrestore(&ch->ch_lock, flags);
return -ENOIOCTLCMD;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 1537 | 89.57% | 6 | 40.00% |
| Roberta Dobrescu | 132 | 7.69% | 1 | 6.67% |
| DaeSeok Youn | 32 | 1.86% | 4 | 26.67% |
| Walt Feasel | 9 | 0.52% | 2 | 13.33% |
| Rehas Sachdeva | 3 | 0.17% | 1 | 6.67% |
| Fernando Apesteguia | 3 | 0.17% | 1 | 6.67% |
| Total | 1716 | 100.00% | 15 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Lidza Louina | 9575 | 89.02% | 12 | 19.67% |
| Roberta Dobrescu | 437 | 4.06% | 3 | 4.92% |
| DaeSeok Youn | 408 | 3.79% | 18 | 29.51% |
| Fernando Apesteguia | 101 | 0.94% | 1 | 1.64% |
| Giedrius Statkevičius | 60 | 0.56% | 3 | 4.92% |
| Quentin Lambert | 54 | 0.50% | 2 | 3.28% |
| Walt Feasel | 54 | 0.50% | 2 | 3.28% |
| Chi Pham | 16 | 0.15% | 1 | 1.64% |
| SeungHun Lee | 14 | 0.13% | 2 | 3.28% |
| Peter Hurley | 8 | 0.07% | 3 | 4.92% |
| Rehas Sachdeva | 5 | 0.05% | 2 | 3.28% |
| Hari Prasath Gujulan Elango | 5 | 0.05% | 1 | 1.64% |
| Sudip Mukherjee | 3 | 0.03% | 1 | 1.64% |
| Cristina Moraru | 3 | 0.03% | 1 | 1.64% |
| Pankaj Bharadiya | 3 | 0.03% | 1 | 1.64% |
| Ebru Akagunduz | 2 | 0.02% | 1 | 1.64% |
| Ingo Molnar | 2 | 0.02% | 1 | 1.64% |
| Masanari Iida | 1 | 0.01% | 1 | 1.64% |
| Elise Lennion | 1 | 0.01% | 1 | 1.64% |
| Kieron Browne | 1 | 0.01% | 1 | 1.64% |
| Benoit Hiller | 1 | 0.01% | 1 | 1.64% |
| Konrad Zapalowicz | 1 | 0.01% | 1 | 1.64% |
| Dan Carpenter | 1 | 0.01% | 1 | 1.64% |
| Total | 10756 | 100.00% | 61 | 100.00% |
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