int sirdev_receive(struct sir_dev *dev, const unsigned char *cp, size_t count) 
{
	if (!dev || !dev->netdev) {
		IRDA_WARNING("%s(), not ready yet!\n", __FUNCTION__);
		return -1;
	}

	if (!dev->irlap) {
		IRDA_WARNING("%s - too early: %p / %zd!\n",
			     __FUNCTION__, cp, count);
		return -1;
	}

	if (cp==NULL) {
		/* error already at lower level receive
		 * just update stats and set media busy
		 */
		irda_device_set_media_busy(dev->netdev, TRUE);
		dev->stats.rx_dropped++;
		IRDA_DEBUG(0, "%s; rx-drop: %zd\n", __FUNCTION__, count);
		return 0;
	}

	/* Read the characters into the buffer */
	if (likely(atomic_read(&dev->enable_rx))) {
		while (count--)
			/* Unwrap and destuff one byte */
			async_unwrap_char(dev->netdev, &dev->stats, 
					  &dev->rx_buff, *cp++);
	} else {
		while (count--) {
			/* rx not enabled: save the raw bytes and never
			 * trigger any netif_rx. The received bytes are flushed
			 * later when we re-enable rx but might be read meanwhile
			 * by the dongle driver.
			 */
			dev->rx_buff.data[dev->rx_buff.len++] = *cp++;

			/* What should we do when the buffer is full? */
			if (unlikely(dev->rx_buff.len == dev->rx_buff.truesize))
				dev->rx_buff.len = 0;
		}
	}

	return 0;
}

static int girbil_reset(struct sir_dev *dev)
{
	unsigned state = dev->fsm.substate;
	unsigned delay = 0;
	u8 control = GIRBIL_TXEN | GIRBIL_RXEN;
	int ret = 0;

	IRDA_DEBUG(2, "%s()\n", __func__);

	switch (state) {
	case SIRDEV_STATE_DONGLE_RESET:
		/* Reset dongle */
		sirdev_set_dtr_rts(dev, TRUE, FALSE);
		/* Sleep at least 5 ms */
		delay = 20;
		state = GIRBIL_STATE_WAIT1_RESET;
		break;

	case GIRBIL_STATE_WAIT1_RESET:
		/* Set DTR and clear RTS to enter command mode */
		sirdev_set_dtr_rts(dev, FALSE, TRUE);
		delay = 20;
		state = GIRBIL_STATE_WAIT2_RESET;
		break;

	case GIRBIL_STATE_WAIT2_RESET:
		/* Write control byte */
		sirdev_raw_write(dev, &control, 1);
		delay = 20;
		state = GIRBIL_STATE_WAIT3_RESET;
		break;

	case GIRBIL_STATE_WAIT3_RESET:
		/* Go back to normal mode */
		sirdev_set_dtr_rts(dev, TRUE, TRUE);
		dev->speed = 9600;
		break;

	default:
		IRDA_ERROR("%s(), undefined state %d\n", __func__, state);
		ret = -1;
		break;
	}
	dev->fsm.substate = state;
	return (delay > 0) ? delay : ret;
}

static int girbil_open(struct sir_dev *dev)
{
	struct qos_info *qos = &dev->qos;

	IRDA_DEBUG(2, "%s()\n", __func__);

	/* Power on dongle */
	sirdev_set_dtr_rts(dev, TRUE, TRUE);

	qos->baud_rate.bits &= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
	qos->min_turn_time.bits = 0x03;
	irda_qos_bits_to_value(qos);

	/* irda thread waits 50 msec for power settling */

	return 0;
}

/*
	Power on:
		(0) Clear RTS and DTR for 1 second
		(1) Set RTS and DTR for 1 second
		(2) 9600 bps now
	Note: assume RTS, DTR are clear before
*/
static void ma600_open(dongle_t *self, struct qos_info *qos)
{
	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);

	qos->baud_rate.bits &= IR_2400|IR_9600|IR_19200|IR_38400
				|IR_57600|IR_115200;
	qos->min_turn_time.bits = 0x01;		/* Needs at least 1 ms */	
	irda_qos_bits_to_value(qos);

	//self->set_dtr_rts(self->dev, FALSE, FALSE);
	// should wait 1 second

	self->set_dtr_rts(self->dev, TRUE, TRUE);
	// should wait 1 second

	MOD_INC_USE_COUNT;
}

/*
 * Function iriap_open (void)
 *
 *    Opens an instance of the IrIAP layer, and registers with IrLMP
 */
struct iriap_cb *iriap_open(__u8 slsap_sel, int mode, void *priv,
			    CONFIRM_CALLBACK callback)
{
	struct iriap_cb *self;

	IRDA_DEBUG(2, "%s()\n", __func__);

	self = kzalloc(sizeof(*self), GFP_ATOMIC);
	if (!self) {
		IRDA_WARNING("%s: Unable to kmalloc!\n", __func__);
		return NULL;
	}

	/*
	 *  Initialize instance
	 */

	self->magic = IAS_MAGIC;
	self->mode = mode;
	if (mode == IAS_CLIENT) {
		if (iriap_register_lsap(self, slsap_sel, mode)) {
			kfree(self);
			return NULL;
		}
	}

	self->confirm = callback;
	self->priv = priv;

	/* iriap_getvaluebyclass_request() will construct packets before
	 * we connect, so this must have a sane value... Jean II */
	self->max_header_size = LMP_MAX_HEADER;

	init_timer(&self->watchdog_timer);

	hashbin_insert(iriap, (irda_queue_t *) self, (long) self, NULL);

	/* Initialize state machines */
	iriap_next_client_state(self, S_DISCONNECT);
	iriap_next_call_state(self, S_MAKE_CALL);
	iriap_next_server_state(self, R_DISCONNECT);
	iriap_next_r_connect_state(self, R_WAITING);

	return self;
}

/*
 * Function ircomm_ttp_connect_request (self, userdata)
 *
 *    
 *
 */
int ircomm_ttp_connect_request(struct ircomm_cb *self, 
			       struct sk_buff *userdata, 
			       struct ircomm_info *info)
{
	int ret = 0;

	IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );

	/* Don't forget to refcount it - should be NULL anyway */
	if(userdata)
		skb_get(userdata);

	ret = irttp_connect_request(self->tsap, info->dlsap_sel,
				    info->saddr, info->daddr, NULL, 
				    TTP_SAR_DISABLE, userdata); 

	return ret;
}	

/*
 * Function irlan_eth_open (dev)
 *
 *    Network device has been opened by user
 *
 */
static int irlan_eth_open(struct net_device *dev)
{
	struct irlan_cb *self = netdev_priv(dev);

	IRDA_DEBUG(2, "%s()\n", __func__ );

	/* Ready to play! */
	netif_stop_queue(dev); /* Wait until data link is ready */

	/* We are now open, so time to do some work */
	self->disconnect_reason = 0;
	irlan_client_wakeup(self, self->saddr, self->daddr);

	/* Make sure we have a hardware address before we return,
	   so DHCP clients gets happy */
	return wait_event_interruptible(self->open_wait,
					!self->tsap_data->connected);
}

/*
 * Function ircomm_tty_tiocmget (tty)
 *
 *
 *
 */
int ircomm_tty_tiocmget(struct tty_struct *tty)
{
	struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
	unsigned int result;

	IRDA_DEBUG(2, "%s()\n", __func__ );

	if (tty->flags & (1 << TTY_IO_ERROR))
		return -EIO;

	result =  ((self->settings.dte & IRCOMM_RTS) ? TIOCM_RTS : 0)
		| ((self->settings.dte & IRCOMM_DTR) ? TIOCM_DTR : 0)
		| ((self->settings.dce & IRCOMM_CD)  ? TIOCM_CAR : 0)
		| ((self->settings.dce & IRCOMM_RI)  ? TIOCM_RNG : 0)
		| ((self->settings.dce & IRCOMM_DSR) ? TIOCM_DSR : 0)
		| ((self->settings.dce & IRCOMM_CTS) ? TIOCM_CTS : 0);
	return result;
}

int ma600_reset(struct sir_dev *dev)
{
	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);

	/* Reset the dongle : set DTR low for 10 ms */
	sirdev_set_dtr_rts(dev, FALSE, TRUE);
	set_current_state(TASK_UNINTERRUPTIBLE);
	schedule_timeout(msecs_to_jiffies(10));

	/* Go back to normal mode */
	sirdev_set_dtr_rts(dev, TRUE, TRUE);
	set_current_state(TASK_UNINTERRUPTIBLE);
	schedule_timeout(msecs_to_jiffies(10));

	dev->speed = 9600;      /* That's the dongle-default */

	return 0;
}

static int litelink_open(struct sir_dev *dev)
{
	struct qos_info *qos = &dev->qos;

	IRDA_DEBUG(2, "%s()\n", __func__);

	/* Power up dongle */
	sirdev_set_dtr_rts(dev, TRUE, TRUE);

	/* Set the speeds we can accept */
	qos->baud_rate.bits &= IR_115200|IR_57600|IR_38400|IR_19200|IR_9600;
	qos->min_turn_time.bits = 0x7f; /* Needs 0.01 ms */
	irda_qos_bits_to_value(qos);

	/* irda thread waits 50 msec for power settling */

	return 0;
}

/*
 * Function ircomm_tty_set_termios (tty, old_termios)
 *
 *    This routine allows the tty driver to be notified when device's
 *    termios settings have changed.  Note that a well-designed tty driver
 *    should be prepared to accept the case where old == NULL, and try to
 *    do something rational.
 */
void ircomm_tty_set_termios(struct tty_struct *tty,
			    struct ktermios *old_termios)
{
	struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
	unsigned int cflag = tty->termios->c_cflag;

	IRDA_DEBUG(2, "%s()\n", __func__ );

	if ((cflag == old_termios->c_cflag) &&
	    (RELEVANT_IFLAG(tty->termios->c_iflag) ==
	     RELEVANT_IFLAG(old_termios->c_iflag)))
	{
		return;
	}

	ircomm_tty_change_speed(self);

	/* Handle transition to B0 status */
	if ((old_termios->c_cflag & CBAUD) &&
	    !(cflag & CBAUD)) {
		self->settings.dte &= ~(IRCOMM_DTR|IRCOMM_RTS);
		ircomm_param_request(self, IRCOMM_DTE, TRUE);
	}

	/* Handle transition away from B0 status */
	if (!(old_termios->c_cflag & CBAUD) &&
	    (cflag & CBAUD)) {
		self->settings.dte |= IRCOMM_DTR;
		if (!(tty->termios->c_cflag & CRTSCTS) ||
		    !test_bit(TTY_THROTTLED, &tty->flags)) {
			self->settings.dte |= IRCOMM_RTS;
		}
		ircomm_param_request(self, IRCOMM_DTE, TRUE);
	}

	/* Handle turning off CRTSCTS */
	if ((old_termios->c_cflag & CRTSCTS) &&
	    !(tty->termios->c_cflag & CRTSCTS))
	{
		tty->hw_stopped = 0;
		ircomm_tty_start(tty);
	}
}

static int old_belkin_open(struct sir_dev *dev)
{
	struct qos_info *qos = &dev->qos;

	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);

	/* Power on dongle */
	sirdev_set_dtr_rts(dev, TRUE, TRUE);

	/* Not too fast, please... */
	qos->baud_rate.bits &= IR_9600;
	/* Needs at least 10 ms (totally wild guess, can do probably better) */
	qos->min_turn_time.bits = 0x01;
	irda_qos_bits_to_value(qos);

	/* irda thread waits 50 msec for power settling */

	return 0;
}

/*
	Power on:
		(0) Clear RTS and DTR for 1 second
		(1) Set RTS and DTR for 1 second
		(2) 9600 bps now
	Note: assume RTS, DTR are clear before
*/
static int ma600_open(struct sir_dev *dev)
{
	struct qos_info *qos = &dev->qos;

	IRDA_DEBUG(2, "%s()\n", __func__);

	sirdev_set_dtr_rts(dev, TRUE, TRUE);

	/* Explicitly set the speeds we can accept */
	qos->baud_rate.bits &= IR_2400|IR_9600|IR_19200|IR_38400
				|IR_57600|IR_115200;
	/* Hm, 0x01 means 10ms - for >= 1ms we would need 0x07 */
	qos->min_turn_time.bits = 0x01;		/* Needs at least 1 ms */	
	irda_qos_bits_to_value(qos);

	/* irda thread waits 50 msec for power settling */

	return 0;
}

/*
 * Function irda_device_is_receiving (dev)
 *
 *    Check if the device driver is currently receiving data
 *
 */
int irda_device_is_receiving(struct net_device *dev)
{
	struct if_irda_req req;
	int ret;

	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);

	if (!dev->do_ioctl) {
		IRDA_ERROR("%s: do_ioctl not impl. by device driver\n",
			   __FUNCTION__);
		return -1;
	}

	ret = dev->do_ioctl(dev, (struct ifreq *) &req, SIOCGRECEIVING);
	if (ret < 0)
		return ret;

	return req.ifr_receiving;
}

static irda_queue_t *dequeue_first(irda_queue_t **queue)
{
	irda_queue_t *ret;

	IRDA_DEBUG( 4, "dequeue_first()\n");

	ret =  *queue;

	if ( *queue == NULL ) {
	} else if ( (*queue)->q_next == *queue ) {
		*queue = NULL;
	} else {
		(*queue)->q_prev->q_next = (*queue)->q_next;
		(*queue)->q_next->q_prev = (*queue)->q_prev;
		*queue = (*queue)->q_next;
	}

	return ret;
}

static int tekram_reset(struct sir_dev *dev)
{
	IRDA_DEBUG(2, "%s()\n", __func__);

	
	sirdev_set_dtr_rts(dev, FALSE, TRUE); 

	
	msleep(1);

	
	sirdev_set_dtr_rts(dev, TRUE, TRUE);
	
	
	udelay(75);

	dev->speed = 9600;

	return 0;
}

static int tekram_reset(struct sir_dev *dev)
{
	IRDA_DEBUG(2, "%s()\n", __func__);

	/* Clear DTR, Set RTS */
	sirdev_set_dtr_rts(dev, FALSE, TRUE);

	/* Should sleep 1 ms */
	msleep(1);

	/* Set DTR, Set RTS */
	sirdev_set_dtr_rts(dev, TRUE, TRUE);

	/* Wait at least 50 us */
	udelay(75);

	dev->speed = 9600;

	return 0;
}

/*
 * Function irlap_queue_xmit (self, skb)
 *
 *    A little wrapper for dev_queue_xmit, so we can insert some common
 *    code into it.
 */
void irlap_queue_xmit(struct irlap_cb *self, struct sk_buff *skb)
{
	/* Some common init stuff */
	skb->dev = self->netdev;
	skb_reset_mac_header(skb);
	skb_reset_network_header(skb);
	skb_reset_transport_header(skb);
	skb->protocol = htons(ETH_P_IRDA);
	skb->priority = TC_PRIO_BESTEFFORT;

	irlap_insert_info(self, skb);

	if (unlikely(self->mode & IRDA_MODE_MONITOR)) {
		IRDA_DEBUG(3, "%s(): %s is in monitor mode\n", __func__,
			   self->netdev->name);
		dev_kfree_skb(skb);
		return;
	}

	dev_queue_xmit(skb);
}

static int tekram_reset(struct sir_dev *dev)
{
	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);

	/* Clear DTR, Set RTS */
	sirdev_set_dtr_rts(dev, FALSE, TRUE); 

	/* Should sleep 1 ms */
	set_current_state(TASK_UNINTERRUPTIBLE);
	schedule_timeout(MSECS_TO_JIFFIES(1));

	/* Set DTR, Set RTS */
	sirdev_set_dtr_rts(dev, TRUE, TRUE);
	
	/* Wait at least 50 us */
	udelay(75);

	dev->speed = 9600;

	return 0;
}

static int mcp2120_reset(struct sir_dev *dev)
{
	unsigned state = dev->fsm.substate;
	unsigned delay = 0;
	int ret = 0;

	IRDA_DEBUG(2, "%s()\n", __func__);

	switch (state) {
	case SIRDEV_STATE_DONGLE_RESET:
;
		/* Reset dongle by setting RTS*/
		sirdev_set_dtr_rts(dev, TRUE, TRUE);
		state = MCP2120_STATE_WAIT1_RESET;
		delay = 50;
		break;

	case MCP2120_STATE_WAIT1_RESET:
;
                /* clear RTS and wait for at least 30 ms. */
		sirdev_set_dtr_rts(dev, FALSE, FALSE);
		state = MCP2120_STATE_WAIT2_RESET;
		delay = 50;
		break;

	case MCP2120_STATE_WAIT2_RESET:
;
		/* Go back to normal mode */
		sirdev_set_dtr_rts(dev, FALSE, FALSE);
		break;

	default:
		IRDA_ERROR("%s(), undefined state %d\n", __func__, state);
		ret = -EINVAL;
		break;
	}
	dev->fsm.substate = state;
	return (delay > 0) ? delay : ret;
}