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ircomm_tty.c
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/*********************************************************************
*
* Filename: ircomm_tty.c
* Version: 1.0
* Description: IrCOMM serial TTY driver
* Status: Experimental.
* Author: Dag Brattli <dagb@cs.uit.no>
* Created at: Sun Jun 6 21:00:56 1999
* Modified at: Wed Feb 23 00:09:02 2000
* Modified by: Dag Brattli <dagb@cs.uit.no>
* Sources: serial.c and previous IrCOMM work by Takahide Higuchi
*
* Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
* Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.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 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; 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., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
********************************************************************/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/termios.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/interrupt.h>
#include <linux/device.h> /* for MODULE_ALIAS_CHARDEV_MAJOR */
#include <asm/uaccess.h>
#include <net/irda/irda.h>
#include <net/irda/irmod.h>
#include <net/irda/ircomm_core.h>
#include <net/irda/ircomm_param.h>
#include <net/irda/ircomm_tty_attach.h>
#include <net/irda/ircomm_tty.h>
static int ircomm_tty_open(struct tty_struct *tty, struct file *filp);
static void ircomm_tty_close(struct tty_struct * tty, struct file *filp);
static int ircomm_tty_write(struct tty_struct * tty,
const unsigned char *buf, int count);
static int ircomm_tty_write_room(struct tty_struct *tty);
static void ircomm_tty_throttle(struct tty_struct *tty);
static void ircomm_tty_unthrottle(struct tty_struct *tty);
static int ircomm_tty_chars_in_buffer(struct tty_struct *tty);
static void ircomm_tty_flush_buffer(struct tty_struct *tty);
static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch);
static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout);
static void ircomm_tty_hangup(struct tty_struct *tty);
static void ircomm_tty_do_softint(struct work_struct *work);
static void ircomm_tty_shutdown(struct ircomm_tty_cb *self);
static void ircomm_tty_stop(struct tty_struct *tty);
static int ircomm_tty_data_indication(void *instance, void *sap,
struct sk_buff *skb);
static int ircomm_tty_control_indication(void *instance, void *sap,
struct sk_buff *skb);
static void ircomm_tty_flow_indication(void *instance, void *sap,
LOCAL_FLOW cmd);
#ifdef CONFIG_PROC_FS
static const struct file_operations ircomm_tty_proc_fops;
#endif /* CONFIG_PROC_FS */
static struct tty_driver *driver;
static hashbin_t *ircomm_tty = NULL;
static const struct tty_operations ops = {
.open = ircomm_tty_open,
.close = ircomm_tty_close,
.write = ircomm_tty_write,
.write_room = ircomm_tty_write_room,
.chars_in_buffer = ircomm_tty_chars_in_buffer,
.flush_buffer = ircomm_tty_flush_buffer,
.ioctl = ircomm_tty_ioctl, /* ircomm_tty_ioctl.c */
.tiocmget = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */
.tiocmset = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */
.throttle = ircomm_tty_throttle,
.unthrottle = ircomm_tty_unthrottle,
.send_xchar = ircomm_tty_send_xchar,
.set_termios = ircomm_tty_set_termios,
.stop = ircomm_tty_stop,
.start = ircomm_tty_start,
.hangup = ircomm_tty_hangup,
.wait_until_sent = ircomm_tty_wait_until_sent,
#ifdef CONFIG_PROC_FS
.proc_fops = &ircomm_tty_proc_fops,
#endif /* CONFIG_PROC_FS */
};
/*
* Function ircomm_tty_init()
*
* Init IrCOMM TTY layer/driver
*
*/
static int __init ircomm_tty_init(void)
{
driver = alloc_tty_driver(IRCOMM_TTY_PORTS);
if (!driver)
return -ENOMEM;
ircomm_tty = hashbin_new(HB_LOCK);
if (ircomm_tty == NULL) {
IRDA_ERROR("%s(), can't allocate hashbin!\n", __func__);
put_tty_driver(driver);
return -ENOMEM;
}
driver->driver_name = "ircomm";
driver->name = "ircomm";
driver->major = IRCOMM_TTY_MAJOR;
driver->minor_start = IRCOMM_TTY_MINOR;
driver->type = TTY_DRIVER_TYPE_SERIAL;
driver->subtype = SERIAL_TYPE_NORMAL;
driver->init_termios = tty_std_termios;
driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
driver->flags = TTY_DRIVER_REAL_RAW;
tty_set_operations(driver, &ops);
if (tty_register_driver(driver)) {
IRDA_ERROR("%s(): Couldn't register serial driver\n",
__func__);
put_tty_driver(driver);
return -1;
}
return 0;
}
static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self)
{
IRDA_DEBUG(0, "%s()\n", __func__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
ircomm_tty_shutdown(self);
self->magic = 0;
kfree(self);
}
/*
* Function ircomm_tty_cleanup ()
*
* Remove IrCOMM TTY layer/driver
*
*/
static void __exit ircomm_tty_cleanup(void)
{
int ret;
IRDA_DEBUG(4, "%s()\n", __func__ );
ret = tty_unregister_driver(driver);
if (ret) {
IRDA_ERROR("%s(), failed to unregister driver\n",
__func__);
return;
}
hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup);
put_tty_driver(driver);
}
/*
* Function ircomm_startup (self)
*
*
*
*/
static int ircomm_tty_startup(struct ircomm_tty_cb *self)
{
notify_t notify;
int ret = -ENODEV;
IRDA_DEBUG(2, "%s()\n", __func__ );
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
/* Check if already open */
if (test_and_set_bit(ASYNC_B_INITIALIZED, &self->flags)) {
IRDA_DEBUG(2, "%s(), already open so break out!\n", __func__ );
return 0;
}
/* Register with IrCOMM */
irda_notify_init(¬ify);
/* These callbacks we must handle ourselves */
notify.data_indication = ircomm_tty_data_indication;
notify.udata_indication = ircomm_tty_control_indication;
notify.flow_indication = ircomm_tty_flow_indication;
/* Use the ircomm_tty interface for these ones */
notify.disconnect_indication = ircomm_tty_disconnect_indication;
notify.connect_confirm = ircomm_tty_connect_confirm;
notify.connect_indication = ircomm_tty_connect_indication;
strlcpy(notify.name, "ircomm_tty", sizeof(notify.name));
notify.instance = self;
if (!self->ircomm) {
self->ircomm = ircomm_open(¬ify, self->service_type,
self->line);
}
if (!self->ircomm)
goto err;
self->slsap_sel = self->ircomm->slsap_sel;
/* Connect IrCOMM link with remote device */
ret = ircomm_tty_attach_cable(self);
if (ret < 0) {
IRDA_ERROR("%s(), error attaching cable!\n", __func__);
goto err;
}
return 0;
err:
clear_bit(ASYNC_B_INITIALIZED, &self->flags);
return ret;
}
/*
* Function ircomm_block_til_ready (self, filp)
*
*
*
*/
static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
struct file *filp)
{
DECLARE_WAITQUEUE(wait, current);
int retval;
int do_clocal = 0, extra_count = 0;
unsigned long flags;
struct tty_struct *tty;
IRDA_DEBUG(2, "%s()\n", __func__ );
tty = self->tty;
/*
* If non-blocking mode is set, or the port is not enabled,
* then make the check up front and then exit.
*/
if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
/* nonblock mode is set or port is not enabled */
self->flags |= ASYNC_NORMAL_ACTIVE;
IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __func__ );
return 0;
}
if (tty->termios->c_cflag & CLOCAL) {
IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __func__ );
do_clocal = 1;
}
/* Wait for carrier detect and the line to become
* free (i.e., not in use by the callout). While we are in
* this loop, self->open_count is dropped by one, so that
* mgsl_close() knows when to free things. We restore it upon
* exit, either normal or abnormal.
*/
retval = 0;
add_wait_queue(&self->open_wait, &wait);
IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n",
__FILE__,__LINE__, tty->driver->name, self->open_count );
/* As far as I can see, we protect open_count - Jean II */
spin_lock_irqsave(&self->spinlock, flags);
if (!tty_hung_up_p(filp)) {
extra_count = 1;
self->open_count--;
}
spin_unlock_irqrestore(&self->spinlock, flags);
self->blocked_open++;
while (1) {
if (tty->termios->c_cflag & CBAUD) {
/* Here, we use to lock those two guys, but
* as ircomm_param_request() does it itself,
* I don't see the point (and I see the deadlock).
* Jean II */
self->settings.dte |= IRCOMM_RTS + IRCOMM_DTR;
ircomm_param_request(self, IRCOMM_DTE, TRUE);
}
current->state = TASK_INTERRUPTIBLE;
if (tty_hung_up_p(filp) ||
!test_bit(ASYNC_B_INITIALIZED, &self->flags)) {
retval = (self->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS;
break;
}
/*
* Check if link is ready now. Even if CLOCAL is
* specified, we cannot return before the IrCOMM link is
* ready
*/
if (!test_bit(ASYNC_B_CLOSING, &self->flags) &&
(do_clocal || (self->settings.dce & IRCOMM_CD)) &&
self->state == IRCOMM_TTY_READY)
{
break;
}
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
}
IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n",
__FILE__,__LINE__, tty->driver->name, self->open_count );
schedule();
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(&self->open_wait, &wait);
if (extra_count) {
/* ++ is not atomic, so this should be protected - Jean II */
spin_lock_irqsave(&self->spinlock, flags);
self->open_count++;
spin_unlock_irqrestore(&self->spinlock, flags);
}
self->blocked_open--;
IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n",
__FILE__,__LINE__, tty->driver->name, self->open_count);
if (!retval)
self->flags |= ASYNC_NORMAL_ACTIVE;
return retval;
}
/*
* Function ircomm_tty_open (tty, filp)
*
* This routine is called when a particular tty device is opened. This
* routine is mandatory; if this routine is not filled in, the attempted
* open will fail with ENODEV.
*/
static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
{
struct ircomm_tty_cb *self;
unsigned int line = tty->index;
unsigned long flags;
int ret;
IRDA_DEBUG(2, "%s()\n", __func__ );
/* Check if instance already exists */
self = hashbin_lock_find(ircomm_tty, line, NULL);
if (!self) {
/* No, so make new instance */
self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
if (self == NULL) {
IRDA_ERROR("%s(), kmalloc failed!\n", __func__);
return -ENOMEM;
}
self->magic = IRCOMM_TTY_MAGIC;
self->flow = FLOW_STOP;
self->line = line;
INIT_WORK(&self->tqueue, ircomm_tty_do_softint);
self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
self->close_delay = 5*HZ/10;
self->closing_wait = 30*HZ;
/* Init some important stuff */
init_timer(&self->watchdog_timer);
init_waitqueue_head(&self->open_wait);
init_waitqueue_head(&self->close_wait);
spin_lock_init(&self->spinlock);
/*
* Force TTY into raw mode by default which is usually what
* we want for IrCOMM and IrLPT. This way applications will
* not have to twiddle with printcap etc.
*
* Note this is completely usafe and doesn't work properly
*/
tty->termios->c_iflag = 0;
tty->termios->c_oflag = 0;
/* Insert into hash */
hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
}
/* ++ is not atomic, so this should be protected - Jean II */
spin_lock_irqsave(&self->spinlock, flags);
self->open_count++;
tty->driver_data = self;
self->tty = tty;
spin_unlock_irqrestore(&self->spinlock, flags);
IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __func__ , tty->driver->name,
self->line, self->open_count);
/* Not really used by us, but lets do it anyway */
self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
/*
* If the port is the middle of closing, bail out now
*/
if (tty_hung_up_p(filp) ||
test_bit(ASYNC_B_CLOSING, &self->flags)) {
/* Hm, why are we blocking on ASYNC_CLOSING if we
* do return -EAGAIN/-ERESTARTSYS below anyway?
* IMHO it's either not needed in the first place
* or for some reason we need to make sure the async
* closing has been finished - if so, wouldn't we
* probably better sleep uninterruptible?
*/
if (wait_event_interruptible(self->close_wait, !test_bit(ASYNC_B_CLOSING, &self->flags))) {
IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n",
__func__);
return -ERESTARTSYS;
}
#ifdef SERIAL_DO_RESTART
return (self->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS;
#else
return -EAGAIN;
#endif
}
/* Check if this is a "normal" ircomm device, or an irlpt device */
if (line < 0x10) {
self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
/* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
IRDA_DEBUG(2, "%s(), IrCOMM device\n", __func__ );
} else {
IRDA_DEBUG(2, "%s(), IrLPT device\n", __func__ );
self->service_type = IRCOMM_3_WIRE_RAW;
self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
}
ret = ircomm_tty_startup(self);
if (ret)
return ret;
ret = ircomm_tty_block_til_ready(self, filp);
if (ret) {
IRDA_DEBUG(2,
"%s(), returning after block_til_ready with %d\n", __func__ ,
ret);
return ret;
}
return 0;
}
/*
* Function ircomm_tty_close (tty, filp)
*
* This routine is called when a particular tty device is closed.
*
*/
static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
unsigned long flags;
IRDA_DEBUG(0, "%s()\n", __func__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
spin_lock_irqsave(&self->spinlock, flags);
if (tty_hung_up_p(filp)) {
spin_unlock_irqrestore(&self->spinlock, flags);
IRDA_DEBUG(0, "%s(), returning 1\n", __func__ );
return;
}
if ((tty->count == 1) && (self->open_count != 1)) {
/*
* Uh, oh. tty->count is 1, which means that the tty
* structure will be freed. state->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.
*/
IRDA_DEBUG(0, "%s(), bad serial port count; "
"tty->count is 1, state->count is %d\n", __func__ ,
self->open_count);
self->open_count = 1;
}
if (--self->open_count < 0) {
IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n",
__func__, self->line, self->open_count);
self->open_count = 0;
}
if (self->open_count) {
spin_unlock_irqrestore(&self->spinlock, flags);
IRDA_DEBUG(0, "%s(), open count > 0\n", __func__ );
return;
}
/* Hum... Should be test_and_set_bit ??? - Jean II */
set_bit(ASYNC_B_CLOSING, &self->flags);
/* We need to unlock here (we were unlocking at the end of this
* function), because tty_wait_until_sent() may schedule.
* I don't know if the rest should be protected somehow,
* so someone should check. - Jean II */
spin_unlock_irqrestore(&self->spinlock, flags);
/*
* Now we wait for the transmit buffer to clear; and we notify
* the line discipline to only process XON/XOFF characters.
*/
tty->closing = 1;
if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE)
tty_wait_until_sent_from_close(tty, self->closing_wait);
ircomm_tty_shutdown(self);
tty_driver_flush_buffer(tty);
tty_ldisc_flush(tty);
tty->closing = 0;
self->tty = NULL;
if (self->blocked_open) {
if (self->close_delay)
schedule_timeout_interruptible(self->close_delay);
wake_up_interruptible(&self->open_wait);
}
self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
wake_up_interruptible(&self->close_wait);
}
/*
* Function ircomm_tty_flush_buffer (tty)
*
*
*
*/
static void ircomm_tty_flush_buffer(struct tty_struct *tty)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
/*
* Let do_softint() do this to avoid race condition with
* do_softint() ;-)
*/
schedule_work(&self->tqueue);
}
/*
* Function ircomm_tty_do_softint (work)
*
* We use this routine to give the write wakeup to the user at at a
* safe time (as fast as possible after write have completed). This
* can be compared to the Tx interrupt.
*/
static void ircomm_tty_do_softint(struct work_struct *work)
{
struct ircomm_tty_cb *self =
container_of(work, struct ircomm_tty_cb, tqueue);
struct tty_struct *tty;
unsigned long flags;
struct sk_buff *skb, *ctrl_skb;
IRDA_DEBUG(2, "%s()\n", __func__ );
if (!self || self->magic != IRCOMM_TTY_MAGIC)
return;
tty = self->tty;
if (!tty)
return;
/* Unlink control buffer */
spin_lock_irqsave(&self->spinlock, flags);
ctrl_skb = self->ctrl_skb;
self->ctrl_skb = NULL;
spin_unlock_irqrestore(&self->spinlock, flags);
/* Flush control buffer if any */
if(ctrl_skb) {
if(self->flow == FLOW_START)
ircomm_control_request(self->ircomm, ctrl_skb);
/* Drop reference count - see ircomm_ttp_data_request(). */
dev_kfree_skb(ctrl_skb);
}
if (tty->hw_stopped)
return;
/* Unlink transmit buffer */
spin_lock_irqsave(&self->spinlock, flags);
skb = self->tx_skb;
self->tx_skb = NULL;
spin_unlock_irqrestore(&self->spinlock, flags);
/* Flush transmit buffer if any */
if (skb) {
ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
/* Drop reference count - see ircomm_ttp_data_request(). */
dev_kfree_skb(skb);
}
/* Check if user (still) wants to be waken up */
tty_wakeup(tty);
}
/*
* Function ircomm_tty_write (tty, buf, count)
*
* This routine is called by the kernel to write a series of characters
* to the tty device. The characters may come from user space or kernel
* space. This routine will return the number of characters actually
* accepted for writing. This routine is mandatory.
*/
static int ircomm_tty_write(struct tty_struct *tty,
const unsigned char *buf, int count)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
unsigned long flags;
struct sk_buff *skb;
int tailroom = 0;
int len = 0;
int size;
IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __func__ , count,
tty->hw_stopped);
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
/* We may receive packets from the TTY even before we have finished
* our setup. Not cool.
* The problem is that we don't know the final header and data size
* to create the proper skb, so any skb we would create would have
* bogus header and data size, so need care.
* We use a bogus header size to safely detect this condition.
* Another problem is that hw_stopped was set to 0 way before it
* should be, so we would drop this skb. It should now be fixed.
* One option is to not accept data until we are properly setup.
* But, I suspect that when it happens, the ppp line discipline
* just "drops" the data, which might screw up connect scripts.
* The second option is to create a "safe skb", with large header
* and small size (see ircomm_tty_open() for values).
* We just need to make sure that when the real values get filled,
* we don't mess up the original "safe skb" (see tx_data_size).
* Jean II */
if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
IRDA_DEBUG(1, "%s() : not initialised\n", __func__);
#ifdef IRCOMM_NO_TX_BEFORE_INIT
/* We didn't consume anything, TTY will retry */
return 0;
#endif
}
if (count < 1)
return 0;
/* Protect our manipulation of self->tx_skb and related */
spin_lock_irqsave(&self->spinlock, flags);
/* Fetch current transmit buffer */
skb = self->tx_skb;
/*
* Send out all the data we get, possibly as multiple fragmented
* frames, but this will only happen if the data is larger than the
* max data size. The normal case however is just the opposite, and
* this function may be called multiple times, and will then actually
* defragment the data and send it out as one packet as soon as
* possible, but at a safer point in time
*/
while (count) {
size = count;
/* Adjust data size to the max data size */
if (size > self->max_data_size)
size = self->max_data_size;
/*
* Do we already have a buffer ready for transmit, or do
* we need to allocate a new frame
*/
if (skb) {
/*
* Any room for more data at the end of the current
* transmit buffer? Cannot use skb_tailroom, since
* dev_alloc_skb gives us a larger skb than we
* requested
* Note : use tx_data_size, because max_data_size
* may have changed and we don't want to overwrite
* the skb. - Jean II
*/
if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
/* Adjust data to tailroom */
if (size > tailroom)
size = tailroom;
} else {
/*
* Current transmit frame is full, so break
* out, so we can send it as soon as possible
*/
break;
}
} else {
/* Prepare a full sized frame */
skb = alloc_skb(self->max_data_size+
self->max_header_size,
GFP_ATOMIC);
if (!skb) {
spin_unlock_irqrestore(&self->spinlock, flags);
return -ENOBUFS;
}
skb_reserve(skb, self->max_header_size);
self->tx_skb = skb;
/* Remember skb size because max_data_size may
* change later on - Jean II */
self->tx_data_size = self->max_data_size;
}
/* Copy data */
memcpy(skb_put(skb,size), buf + len, size);
count -= size;
len += size;
}
spin_unlock_irqrestore(&self->spinlock, flags);
/*
* Schedule a new thread which will transmit the frame as soon
* as possible, but at a safe point in time. We do this so the
* "user" can give us data multiple times, as PPP does (because of
* its 256 byte tx buffer). We will then defragment and send out
* all this data as one single packet.
*/
schedule_work(&self->tqueue);
return len;
}
/*
* Function ircomm_tty_write_room (tty)
*
* This routine returns the numbers of characters the tty driver will
* accept for queuing to be written. This number is subject to change as
* output buffers get emptied, or if the output flow control is acted.
*/
static int ircomm_tty_write_room(struct tty_struct *tty)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
unsigned long flags;
int ret;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
#ifdef IRCOMM_NO_TX_BEFORE_INIT
/* max_header_size tells us if the channel is initialised or not. */
if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
/* Don't bother us yet */
return 0;
#endif
/* Check if we are allowed to transmit any data.
* hw_stopped is the regular flow control.
* Jean II */
if (tty->hw_stopped)
ret = 0;
else {
spin_lock_irqsave(&self->spinlock, flags);
if (self->tx_skb)
ret = self->tx_data_size - self->tx_skb->len;
else
ret = self->max_data_size;
spin_unlock_irqrestore(&self->spinlock, flags);
}
IRDA_DEBUG(2, "%s(), ret=%d\n", __func__ , ret);
return ret;
}
/*
* Function ircomm_tty_wait_until_sent (tty, timeout)
*
* This routine waits until the device has written out all of the
* characters in its transmitter FIFO.
*/
static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
unsigned long orig_jiffies, poll_time;
unsigned long flags;
IRDA_DEBUG(2, "%s()\n", __func__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
orig_jiffies = jiffies;
/* Set poll time to 200 ms */
poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200));
spin_lock_irqsave(&self->spinlock, flags);
while (self->tx_skb && self->tx_skb->len) {
spin_unlock_irqrestore(&self->spinlock, flags);
schedule_timeout_interruptible(poll_time);
spin_lock_irqsave(&self->spinlock, flags);
if (signal_pending(current))
break;
if (timeout && time_after(jiffies, orig_jiffies + timeout))
break;
}
spin_unlock_irqrestore(&self->spinlock, flags);
current->state = TASK_RUNNING;
}
/*
* Function ircomm_tty_throttle (tty)
*
* This routine notifies the tty driver that input buffers for the line
* discipline are close to full, and it should somehow signal that no
* more characters should be sent to the tty.
*/
static void ircomm_tty_throttle(struct tty_struct *tty)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
IRDA_DEBUG(2, "%s()\n", __func__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
/* Software flow control? */
if (I_IXOFF(tty))
ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
/* Hardware flow control? */
if (tty->termios->c_cflag & CRTSCTS) {
self->settings.dte &= ~IRCOMM_RTS;
self->settings.dte |= IRCOMM_DELTA_RTS;
ircomm_param_request(self, IRCOMM_DTE, TRUE);
}
ircomm_flow_request(self->ircomm, FLOW_STOP);
}
/*
* Function ircomm_tty_unthrottle (tty)
*
* This routine notifies the tty drivers that it should signals that
* characters can now be sent to the tty without fear of overrunning the
* input buffers of the line disciplines.
*/
static void ircomm_tty_unthrottle(struct tty_struct *tty)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
IRDA_DEBUG(2, "%s()\n", __func__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
/* Using software flow control? */
if (I_IXOFF(tty)) {
ircomm_tty_send_xchar(tty, START_CHAR(tty));
}
/* Using hardware flow control? */
if (tty->termios->c_cflag & CRTSCTS) {
self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
ircomm_param_request(self, IRCOMM_DTE, TRUE);
IRDA_DEBUG(1, "%s(), FLOW_START\n", __func__ );
}
ircomm_flow_request(self->ircomm, FLOW_START);
}
/*
* Function ircomm_tty_chars_in_buffer (tty)
*
* Indicates if there are any data in the buffer
*
*/
static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
unsigned long flags;
int len = 0;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
spin_lock_irqsave(&self->spinlock, flags);
if (self->tx_skb)
len = self->tx_skb->len;
spin_unlock_irqrestore(&self->spinlock, flags);
return len;
}
static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
{
unsigned long flags;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
IRDA_DEBUG(0, "%s()\n", __func__ );
if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags))
return;
ircomm_tty_detach_cable(self);
spin_lock_irqsave(&self->spinlock, flags);
del_timer(&self->watchdog_timer);
/* Free parameter buffer */
if (self->ctrl_skb) {
dev_kfree_skb(self->ctrl_skb);
self->ctrl_skb = NULL;
}
/* Free transmit buffer */
if (self->tx_skb) {
dev_kfree_skb(self->tx_skb);
self->tx_skb = NULL;
}
if (self->ircomm) {
ircomm_close(self->ircomm);
self->ircomm = NULL;
}
spin_unlock_irqrestore(&self->spinlock, flags);
}
/*
* Function ircomm_tty_hangup (tty)
*
* This routine notifies the tty driver that it should hangup the tty
* device.
*
*/
static void ircomm_tty_hangup(struct tty_struct *tty)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
unsigned long flags;
IRDA_DEBUG(0, "%s()\n", __func__ );