Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 987 insertions, 0 deletions

diff --git a/kernel/drivers/net/irda/sir_dev.c b/kernel/drivers/net/irda/sir_dev.c
new file mode 100644
index 000000000..6af26a7d7
--- /dev/null
+++ b/kernel/drivers/net/irda/sir_dev.c
@@ -0,0 +1,987 @@
+/*********************************************************************
+ *
+ *	sir_dev.c:	irda sir network device
+ * 
+ *	Copyright (c) 2002 Martin Diehl
+ * 
+ *	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.
+ *
+ ********************************************************************/    
+
+#include <linux/hardirq.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+
+#include <net/irda/irda.h>
+#include <net/irda/wrapper.h>
+#include <net/irda/irda_device.h>
+
+#include "sir-dev.h"
+
+
+static struct workqueue_struct *irda_sir_wq;
+
+/* STATE MACHINE */
+
+/* substate handler of the config-fsm to handle the cases where we want
+ * to wait for transmit completion before changing the port configuration
+ */
+
+static int sirdev_tx_complete_fsm(struct sir_dev *dev)
+{
+	struct sir_fsm *fsm = &dev->fsm;
+	unsigned next_state, delay;
+	unsigned bytes_left;
+
+	do {
+		next_state = fsm->substate;	/* default: stay in current substate */
+		delay = 0;
+
+		switch(fsm->substate) {
+
+		case SIRDEV_STATE_WAIT_XMIT:
+			if (dev->drv->chars_in_buffer)
+				bytes_left = dev->drv->chars_in_buffer(dev);
+			else
+				bytes_left = 0;
+			if (!bytes_left) {
+				next_state = SIRDEV_STATE_WAIT_UNTIL_SENT;
+				break;
+			}
+
+			if (dev->speed > 115200)
+				delay = (bytes_left*8*10000) / (dev->speed/100);
+			else if (dev->speed > 0)
+				delay = (bytes_left*10*10000) / (dev->speed/100);
+			else
+				delay = 0;
+			/* expected delay (usec) until remaining bytes are sent */
+			if (delay < 100) {
+				udelay(delay);
+				delay = 0;
+				break;
+			}
+			/* sleep some longer delay (msec) */
+			delay = (delay+999) / 1000;
+			break;
+
+		case SIRDEV_STATE_WAIT_UNTIL_SENT:
+			/* block until underlaying hardware buffer are empty */
+			if (dev->drv->wait_until_sent)
+				dev->drv->wait_until_sent(dev);
+			next_state = SIRDEV_STATE_TX_DONE;
+			break;
+
+		case SIRDEV_STATE_TX_DONE:
+			return 0;
+
+		default:
+			net_err_ratelimited("%s - undefined state\n", __func__);
+			return -EINVAL;
+		}
+		fsm->substate = next_state;
+	} while (delay == 0);
+	return delay;
+}
+
+/*
+ * Function sirdev_config_fsm
+ *
+ * State machine to handle the configuration of the device (and attached dongle, if any).
+ * This handler is scheduled for execution in kIrDAd context, so we can sleep.
+ * however, kIrDAd is shared by all sir_dev devices so we better don't sleep there too
+ * long. Instead, for longer delays we start a timer to reschedule us later.
+ * On entry, fsm->sem is always locked and the netdev xmit queue stopped.
+ * Both must be unlocked/restarted on completion - but only on final exit.
+ */
+
+static void sirdev_config_fsm(struct work_struct *work)
+{
+	struct sir_dev *dev = container_of(work, struct sir_dev, fsm.work.work);
+	struct sir_fsm *fsm = &dev->fsm;
+	int next_state;
+	int ret = -1;
+	unsigned delay;
+
+	pr_debug("%s(), <%ld>\n", __func__, jiffies);
+
+	do {
+		pr_debug("%s - state=0x%04x / substate=0x%04x\n",
+			 __func__, fsm->state, fsm->substate);
+
+		next_state = fsm->state;
+		delay = 0;
+
+		switch(fsm->state) {
+
+		case SIRDEV_STATE_DONGLE_OPEN:
+			if (dev->dongle_drv != NULL) {
+				ret = sirdev_put_dongle(dev);
+				if (ret) {
+					fsm->result = -EINVAL;
+					next_state = SIRDEV_STATE_ERROR;
+					break;
+				}
+			}
+
+			/* Initialize dongle */
+			ret = sirdev_get_dongle(dev, fsm->param);
+			if (ret) {
+				fsm->result = ret;
+				next_state = SIRDEV_STATE_ERROR;
+				break;
+			}
+
+			/* Dongles are powered through the modem control lines which
+			 * were just set during open. Before resetting, let's wait for
+			 * the power to stabilize. This is what some dongle drivers did
+			 * in open before, while others didn't - should be safe anyway.
+			 */
+
+			delay = 50;
+			fsm->substate = SIRDEV_STATE_DONGLE_RESET;
+			next_state = SIRDEV_STATE_DONGLE_RESET;
+
+			fsm->param = 9600;
+
+			break;
+
+		case SIRDEV_STATE_DONGLE_CLOSE:
+			/* shouldn't we just treat this as success=? */
+			if (dev->dongle_drv == NULL) {
+				fsm->result = -EINVAL;
+				next_state = SIRDEV_STATE_ERROR;
+				break;
+			}
+
+			ret = sirdev_put_dongle(dev);
+			if (ret) {
+				fsm->result = ret;
+				next_state = SIRDEV_STATE_ERROR;
+				break;
+			}
+			next_state = SIRDEV_STATE_DONE;
+			break;
+
+		case SIRDEV_STATE_SET_DTR_RTS:
+			ret = sirdev_set_dtr_rts(dev,
+				(fsm->param&0x02) ? TRUE : FALSE,
+				(fsm->param&0x01) ? TRUE : FALSE);
+			next_state = SIRDEV_STATE_DONE;
+			break;
+
+		case SIRDEV_STATE_SET_SPEED:
+			fsm->substate = SIRDEV_STATE_WAIT_XMIT;
+			next_state = SIRDEV_STATE_DONGLE_CHECK;
+			break;
+
+		case SIRDEV_STATE_DONGLE_CHECK:
+			ret = sirdev_tx_complete_fsm(dev);
+			if (ret < 0) {
+				fsm->result = ret;
+				next_state = SIRDEV_STATE_ERROR;
+				break;
+			}
+			if ((delay=ret) != 0)
+				break;
+
+			if (dev->dongle_drv) {
+				fsm->substate = SIRDEV_STATE_DONGLE_RESET;
+				next_state = SIRDEV_STATE_DONGLE_RESET;
+			}
+			else {
+				dev->speed = fsm->param;
+				next_state = SIRDEV_STATE_PORT_SPEED;
+			}
+			break;
+
+		case SIRDEV_STATE_DONGLE_RESET:
+			if (dev->dongle_drv->reset) {
+				ret = dev->dongle_drv->reset(dev);
+				if (ret < 0) {
+					fsm->result = ret;
+					next_state = SIRDEV_STATE_ERROR;
+					break;
+				}
+			}
+			else
+				ret = 0;
+			if ((delay=ret) == 0) {
+				/* set serial port according to dongle default speed */
+				if (dev->drv->set_speed)
+					dev->drv->set_speed(dev, dev->speed);
+				fsm->substate = SIRDEV_STATE_DONGLE_SPEED;
+				next_state = SIRDEV_STATE_DONGLE_SPEED;
+			}
+			break;
+
+		case SIRDEV_STATE_DONGLE_SPEED:
+			if (dev->dongle_drv->set_speed) {
+				ret = dev->dongle_drv->set_speed(dev, fsm->param);
+				if (ret < 0) {
+					fsm->result = ret;
+					next_state = SIRDEV_STATE_ERROR;
+					break;
+				}
+			}
+			else
+				ret = 0;
+			if ((delay=ret) == 0)
+				next_state = SIRDEV_STATE_PORT_SPEED;
+			break;
+
+		case SIRDEV_STATE_PORT_SPEED:
+			/* Finally we are ready to change the serial port speed */
+			if (dev->drv->set_speed)
+				dev->drv->set_speed(dev, dev->speed);
+			dev->new_speed = 0;
+			next_state = SIRDEV_STATE_DONE;
+			break;
+
+		case SIRDEV_STATE_DONE:
+			/* Signal network layer so it can send more frames */
+			netif_wake_queue(dev->netdev);
+			next_state = SIRDEV_STATE_COMPLETE;
+			break;
+
+		default:
+			net_err_ratelimited("%s - undefined state\n", __func__);
+			fsm->result = -EINVAL;
+			/* fall thru */
+
+		case SIRDEV_STATE_ERROR:
+			net_err_ratelimited("%s - error: %d\n",
+					    __func__, fsm->result);
+
+#if 0	/* don't enable this before we have netdev->tx_timeout to recover */
+			netif_stop_queue(dev->netdev);
+#else
+			netif_wake_queue(dev->netdev);
+#endif
+			/* fall thru */
+
+		case SIRDEV_STATE_COMPLETE:
+			/* config change finished, so we are not busy any longer */
+			sirdev_enable_rx(dev);
+			up(&fsm->sem);
+			return;
+		}
+		fsm->state = next_state;
+	} while(!delay);
+
+	queue_delayed_work(irda_sir_wq, &fsm->work, msecs_to_jiffies(delay));
+}
+
+/* schedule some device configuration task for execution by kIrDAd
+ * on behalf of the above state machine.
+ * can be called from process or interrupt/tasklet context.
+ */
+
+int sirdev_schedule_request(struct sir_dev *dev, int initial_state, unsigned param)
+{
+	struct sir_fsm *fsm = &dev->fsm;
+
+	pr_debug("%s - state=0x%04x / param=%u\n", __func__,
+		 initial_state, param);
+
+	if (down_trylock(&fsm->sem)) {
+		if (in_interrupt()  ||  in_atomic()  ||  irqs_disabled()) {
+			pr_debug("%s(), state machine busy!\n", __func__);
+			return -EWOULDBLOCK;
+		} else
+			down(&fsm->sem);
+	}
+
+	if (fsm->state == SIRDEV_STATE_DEAD) {
+		/* race with sirdev_close should never happen */
+		net_err_ratelimited("%s(), instance staled!\n", __func__);
+		up(&fsm->sem);
+		return -ESTALE;		/* or better EPIPE? */
+	}
+
+	netif_stop_queue(dev->netdev);
+	atomic_set(&dev->enable_rx, 0);
+
+	fsm->state = initial_state;
+	fsm->param = param;
+	fsm->result = 0;
+
+	INIT_DELAYED_WORK(&fsm->work, sirdev_config_fsm);
+	queue_delayed_work(irda_sir_wq, &fsm->work, 0);
+	return 0;
+}
+
+
+/***************************************************************************/
+
+void sirdev_enable_rx(struct sir_dev *dev)
+{
+	if (unlikely(atomic_read(&dev->enable_rx)))
+		return;
+
+	/* flush rx-buffer - should also help in case of problems with echo cancelation */
+	dev->rx_buff.data = dev->rx_buff.head;
+	dev->rx_buff.len = 0;
+	dev->rx_buff.in_frame = FALSE;
+	dev->rx_buff.state = OUTSIDE_FRAME;
+	atomic_set(&dev->enable_rx, 1);
+}
+
+static int sirdev_is_receiving(struct sir_dev *dev)
+{
+	if (!atomic_read(&dev->enable_rx))
+		return 0;
+
+	return dev->rx_buff.state != OUTSIDE_FRAME;
+}
+
+int sirdev_set_dongle(struct sir_dev *dev, IRDA_DONGLE type)
+{
+	int err;
+
+	pr_debug("%s : requesting dongle %d.\n", __func__, type);
+
+	err = sirdev_schedule_dongle_open(dev, type);
+	if (unlikely(err))
+		return err;
+	down(&dev->fsm.sem);		/* block until config change completed */
+	err = dev->fsm.result;
+	up(&dev->fsm.sem);
+	return err;
+}
+EXPORT_SYMBOL(sirdev_set_dongle);
+
+/* used by dongle drivers for dongle programming */
+
+int sirdev_raw_write(struct sir_dev *dev, const char *buf, int len)
+{
+	unsigned long flags;
+	int ret;
+
+	if (unlikely(len > dev->tx_buff.truesize))
+		return -ENOSPC;
+
+	spin_lock_irqsave(&dev->tx_lock, flags);	/* serialize with other tx operations */
+	while (dev->tx_buff.len > 0) {			/* wait until tx idle */
+		spin_unlock_irqrestore(&dev->tx_lock, flags);
+		msleep(10);
+		spin_lock_irqsave(&dev->tx_lock, flags);
+	}
+
+	dev->tx_buff.data = dev->tx_buff.head;
+	memcpy(dev->tx_buff.data, buf, len);	
+	dev->tx_buff.len = len;
+
+	ret = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
+	if (ret > 0) {
+		pr_debug("%s(), raw-tx started\n", __func__);
+
+		dev->tx_buff.data += ret;
+		dev->tx_buff.len -= ret;
+		dev->raw_tx = 1;
+		ret = len;		/* all data is going to be sent */
+	}
+	spin_unlock_irqrestore(&dev->tx_lock, flags);
+	return ret;
+}
+EXPORT_SYMBOL(sirdev_raw_write);
+
+/* seems some dongle drivers may need this */
+
+int sirdev_raw_read(struct sir_dev *dev, char *buf, int len)
+{
+	int count;
+
+	if (atomic_read(&dev->enable_rx))
+		return -EIO;		/* fail if we expect irda-frames */
+
+	count = (len < dev->rx_buff.len) ? len : dev->rx_buff.len;
+
+	if (count > 0) {
+		memcpy(buf, dev->rx_buff.data, count);
+		dev->rx_buff.data += count;
+		dev->rx_buff.len -= count;
+	}
+
+	/* remaining stuff gets flushed when re-enabling normal rx */
+
+	return count;
+}
+EXPORT_SYMBOL(sirdev_raw_read);
+
+int sirdev_set_dtr_rts(struct sir_dev *dev, int dtr, int rts)
+{
+	int ret = -ENXIO;
+	if (dev->drv->set_dtr_rts)
+		ret =  dev->drv->set_dtr_rts(dev, dtr, rts);
+	return ret;
+}
+EXPORT_SYMBOL(sirdev_set_dtr_rts);
+
+/**********************************************************************/
+
+/* called from client driver - likely with bh-context - to indicate
+ * it made some progress with transmission. Hence we send the next
+ * chunk, if any, or complete the skb otherwise
+ */
+
+void sirdev_write_complete(struct sir_dev *dev)
+{
+	unsigned long flags;
+	struct sk_buff *skb;
+	int actual = 0;
+	int err;
+	
+	spin_lock_irqsave(&dev->tx_lock, flags);
+
+	pr_debug("%s() - dev->tx_buff.len = %d\n",
+		 __func__, dev->tx_buff.len);
+
+	if (likely(dev->tx_buff.len > 0))  {
+		/* Write data left in transmit buffer */
+		actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
+
+		if (likely(actual>0)) {
+			dev->tx_buff.data += actual;
+			dev->tx_buff.len  -= actual;
+		}
+		else if (unlikely(actual<0)) {
+			/* could be dropped later when we have tx_timeout to recover */
+			net_err_ratelimited("%s: drv->do_write failed (%d)\n",
+					    __func__, actual);
+			if ((skb=dev->tx_skb) != NULL) {
+				dev->tx_skb = NULL;
+				dev_kfree_skb_any(skb);
+				dev->netdev->stats.tx_errors++;
+				dev->netdev->stats.tx_dropped++;
+			}
+			dev->tx_buff.len = 0;
+		}
+		if (dev->tx_buff.len > 0)
+			goto done;	/* more data to send later */
+	}
+
+	if (unlikely(dev->raw_tx != 0)) {
+		/* in raw mode we are just done now after the buffer was sent
+		 * completely. Since this was requested by some dongle driver
+		 * running under the control of the irda-thread we must take
+		 * care here not to re-enable the queue. The queue will be
+		 * restarted when the irda-thread has completed the request.
+		 */
+
+		pr_debug("%s(), raw-tx done\n", __func__);
+		dev->raw_tx = 0;
+		goto done;	/* no post-frame handling in raw mode */
+	}
+
+	/* we have finished now sending this skb.
+	 * update statistics and free the skb.
+	 * finally we check and trigger a pending speed change, if any.
+	 * if not we switch to rx mode and wake the queue for further
+	 * packets.
+	 * note the scheduled speed request blocks until the lower
+	 * client driver and the corresponding hardware has really
+	 * finished sending all data (xmit fifo drained f.e.)
+	 * before the speed change gets finally done and the queue
+	 * re-activated.
+	 */
+
+	pr_debug("%s(), finished with frame!\n", __func__);
+		
+	if ((skb=dev->tx_skb) != NULL) {
+		dev->tx_skb = NULL;
+		dev->netdev->stats.tx_packets++;
+		dev->netdev->stats.tx_bytes += skb->len;
+		dev_kfree_skb_any(skb);
+	}
+
+	if (unlikely(dev->new_speed > 0)) {
+		pr_debug("%s(), Changing speed!\n", __func__);
+		err = sirdev_schedule_speed(dev, dev->new_speed);
+		if (unlikely(err)) {
+			/* should never happen
+			 * forget the speed change and hope the stack recovers
+			 */
+			net_err_ratelimited("%s - schedule speed change failed: %d\n",
+					    __func__, err);
+			netif_wake_queue(dev->netdev);
+		}
+		/* else: success
+		 *	speed change in progress now
+		 *	on completion dev->new_speed gets cleared,
+		 *	rx-reenabled and the queue restarted
+		 */
+	}
+	else {
+		sirdev_enable_rx(dev);
+		netif_wake_queue(dev->netdev);
+	}
+
+done:
+	spin_unlock_irqrestore(&dev->tx_lock, flags);
+}
+EXPORT_SYMBOL(sirdev_write_complete);
+
+/* called from client driver - likely with bh-context - to give us
+ * some more received bytes. We put them into the rx-buffer,
+ * normally unwrapping and building LAP-skb's (unless rx disabled)
+ */
+
+int sirdev_receive(struct sir_dev *dev, const unsigned char *cp, size_t count) 
+{
+	if (!dev || !dev->netdev) {
+		net_warn_ratelimited("%s(), not ready yet!\n", __func__);
+		return -1;
+	}
+
+	if (!dev->irlap) {
+		net_warn_ratelimited("%s - too early: %p / %zd!\n",
+				     __func__, 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->netdev->stats.rx_dropped++;
+		pr_debug("%s; rx-drop: %zd\n", __func__, 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->netdev->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;
+}
+EXPORT_SYMBOL(sirdev_receive);
+
+/**********************************************************************/
+
+/* callbacks from network layer */
+
+static netdev_tx_t sirdev_hard_xmit(struct sk_buff *skb,
+					  struct net_device *ndev)
+{
+	struct sir_dev *dev = netdev_priv(ndev);
+	unsigned long flags;
+	int actual = 0;
+	int err;
+	s32 speed;
+
+	IRDA_ASSERT(dev != NULL, return NETDEV_TX_OK;);
+
+	netif_stop_queue(ndev);
+
+	pr_debug("%s(), skb->len = %d\n", __func__, skb->len);
+
+	speed = irda_get_next_speed(skb);
+	if ((speed != dev->speed) && (speed != -1)) {
+		if (!skb->len) {
+			err = sirdev_schedule_speed(dev, speed);
+			if (unlikely(err == -EWOULDBLOCK)) {
+				/* Failed to initiate the speed change, likely the fsm
+				 * is still busy (pretty unlikely, but...)
+				 * We refuse to accept the skb and return with the queue
+				 * stopped so the network layer will retry after the
+				 * fsm completes and wakes the queue.
+				 */
+				 return NETDEV_TX_BUSY;
+			}
+			else if (unlikely(err)) {
+				/* other fatal error - forget the speed change and
+				 * hope the stack will recover somehow
+				 */
+				 netif_start_queue(ndev);
+			}
+			/* else: success
+			 *	speed change in progress now
+			 *	on completion the queue gets restarted
+			 */
+
+			dev_kfree_skb_any(skb);
+			return NETDEV_TX_OK;
+		} else
+			dev->new_speed = speed;
+	}
+
+	/* Init tx buffer*/
+	dev->tx_buff.data = dev->tx_buff.head;
+
+	/* Check problems */
+	if(spin_is_locked(&dev->tx_lock)) {
+		pr_debug("%s(), write not completed\n", __func__);
+	}
+
+	/* serialize with write completion */
+	spin_lock_irqsave(&dev->tx_lock, flags);
+
+        /* Copy skb to tx_buff while wrapping, stuffing and making CRC */
+	dev->tx_buff.len = async_wrap_skb(skb, dev->tx_buff.data, dev->tx_buff.truesize); 
+
+	/* transmission will start now - disable receive.
+	 * if we are just in the middle of an incoming frame,
+	 * treat it as collision. probably it's a good idea to
+	 * reset the rx_buf OUTSIDE_FRAME in this case too?
+	 */
+	atomic_set(&dev->enable_rx, 0);
+	if (unlikely(sirdev_is_receiving(dev)))
+		dev->netdev->stats.collisions++;
+
+	actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
+
+	if (likely(actual > 0)) {
+		dev->tx_skb = skb;
+		dev->tx_buff.data += actual;
+		dev->tx_buff.len -= actual;
+	}
+	else if (unlikely(actual < 0)) {
+		/* could be dropped later when we have tx_timeout to recover */
+		net_err_ratelimited("%s: drv->do_write failed (%d)\n",
+				    __func__, actual);
+		dev_kfree_skb_any(skb);
+		dev->netdev->stats.tx_errors++;
+		dev->netdev->stats.tx_dropped++;
+		netif_wake_queue(ndev);
+	}
+	spin_unlock_irqrestore(&dev->tx_lock, flags);
+
+	return NETDEV_TX_OK;
+}
+
+/* called from network layer with rtnl hold */
+
+static int sirdev_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
+{
+	struct if_irda_req *irq = (struct if_irda_req *) rq;
+	struct sir_dev *dev = netdev_priv(ndev);
+	int ret = 0;
+
+	IRDA_ASSERT(dev != NULL, return -1;);
+
+	pr_debug("%s(), %s, (cmd=0x%X)\n", __func__, ndev->name, cmd);
+	
+	switch (cmd) {
+	case SIOCSBANDWIDTH: /* Set bandwidth */
+		if (!capable(CAP_NET_ADMIN))
+			ret = -EPERM;
+		else
+			ret = sirdev_schedule_speed(dev, irq->ifr_baudrate);
+		/* cannot sleep here for completion
+		 * we are called from network layer with rtnl hold
+		 */
+		break;
+
+	case SIOCSDONGLE: /* Set dongle */
+		if (!capable(CAP_NET_ADMIN))
+			ret = -EPERM;
+		else
+			ret = sirdev_schedule_dongle_open(dev, irq->ifr_dongle);
+		/* cannot sleep here for completion
+		 * we are called from network layer with rtnl hold
+		 */
+		break;
+
+	case SIOCSMEDIABUSY: /* Set media busy */
+		if (!capable(CAP_NET_ADMIN))
+			ret = -EPERM;
+		else
+			irda_device_set_media_busy(dev->netdev, TRUE);
+		break;
+
+	case SIOCGRECEIVING: /* Check if we are receiving right now */
+		irq->ifr_receiving = sirdev_is_receiving(dev);
+		break;
+
+	case SIOCSDTRRTS:
+		if (!capable(CAP_NET_ADMIN))
+			ret = -EPERM;
+		else
+			ret = sirdev_schedule_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts);
+		/* cannot sleep here for completion
+		 * we are called from network layer with rtnl hold
+		 */
+		break;
+
+	case SIOCSMODE:
+#if 0
+		if (!capable(CAP_NET_ADMIN))
+			ret = -EPERM;
+		else
+			ret = sirdev_schedule_mode(dev, irq->ifr_mode);
+		/* cannot sleep here for completion
+		 * we are called from network layer with rtnl hold
+		 */
+		break;
+#endif
+	default:
+		ret = -EOPNOTSUPP;
+	}
+	
+	return ret;
+}
+
+/* ----------------------------------------------------------------------------- */
+
+#define SIRBUF_ALLOCSIZE 4269	/* worst case size of a wrapped IrLAP frame */
+
+static int sirdev_alloc_buffers(struct sir_dev *dev)
+{
+	dev->tx_buff.truesize = SIRBUF_ALLOCSIZE;
+	dev->rx_buff.truesize = IRDA_SKB_MAX_MTU; 
+
+	/* Bootstrap ZeroCopy Rx */
+	dev->rx_buff.skb = __netdev_alloc_skb(dev->netdev, dev->rx_buff.truesize,
+					      GFP_KERNEL);
+	if (dev->rx_buff.skb == NULL)
+		return -ENOMEM;
+	skb_reserve(dev->rx_buff.skb, 1);
+	dev->rx_buff.head = dev->rx_buff.skb->data;
+
+	dev->tx_buff.head = kmalloc(dev->tx_buff.truesize, GFP_KERNEL);
+	if (dev->tx_buff.head == NULL) {
+		kfree_skb(dev->rx_buff.skb);
+		dev->rx_buff.skb = NULL;
+		dev->rx_buff.head = NULL;
+		return -ENOMEM;
+	}
+
+	dev->tx_buff.data = dev->tx_buff.head;
+	dev->rx_buff.data = dev->rx_buff.head;
+	dev->tx_buff.len = 0;
+	dev->rx_buff.len = 0;
+
+	dev->rx_buff.in_frame = FALSE;
+	dev->rx_buff.state = OUTSIDE_FRAME;
+	return 0;
+};
+
+static void sirdev_free_buffers(struct sir_dev *dev)
+{
+	kfree_skb(dev->rx_buff.skb);
+	kfree(dev->tx_buff.head);
+	dev->rx_buff.head = dev->tx_buff.head = NULL;
+	dev->rx_buff.skb = NULL;
+}
+
+static int sirdev_open(struct net_device *ndev)
+{
+	struct sir_dev *dev = netdev_priv(ndev);
+	const struct sir_driver *drv = dev->drv;
+
+	if (!drv)
+		return -ENODEV;
+
+	/* increase the reference count of the driver module before doing serious stuff */
+	if (!try_module_get(drv->owner))
+		return -ESTALE;
+
+	if (sirdev_alloc_buffers(dev))
+		goto errout_dec;
+
+	if (!dev->drv->start_dev  ||  dev->drv->start_dev(dev))
+		goto errout_free;
+
+	sirdev_enable_rx(dev);
+	dev->raw_tx = 0;
+
+	netif_start_queue(ndev);
+	dev->irlap = irlap_open(ndev, &dev->qos, dev->hwname);
+	if (!dev->irlap)
+		goto errout_stop;
+
+	netif_wake_queue(ndev);
+
+	pr_debug("%s - done, speed = %d\n", __func__, dev->speed);
+
+	return 0;
+
+errout_stop:
+	atomic_set(&dev->enable_rx, 0);
+	if (dev->drv->stop_dev)
+		dev->drv->stop_dev(dev);
+errout_free:
+	sirdev_free_buffers(dev);
+errout_dec:
+	module_put(drv->owner);
+	return -EAGAIN;
+}
+
+static int sirdev_close(struct net_device *ndev)
+{
+	struct sir_dev *dev = netdev_priv(ndev);
+	const struct sir_driver *drv;
+
+/* pr_debug("%s\n", __func__); */
+
+	netif_stop_queue(ndev);
+
+	down(&dev->fsm.sem);		/* block on pending config completion */
+
+	atomic_set(&dev->enable_rx, 0);
+
+	if (unlikely(!dev->irlap))
+		goto out;
+	irlap_close(dev->irlap);
+	dev->irlap = NULL;
+
+	drv = dev->drv;
+	if (unlikely(!drv  ||  !dev->priv))
+		goto out;
+
+	if (drv->stop_dev)
+		drv->stop_dev(dev);
+
+	sirdev_free_buffers(dev);
+	module_put(drv->owner);
+
+out:
+	dev->speed = 0;
+	up(&dev->fsm.sem);
+	return 0;
+}
+
+static const struct net_device_ops sirdev_ops = {
+	.ndo_start_xmit	= sirdev_hard_xmit,
+	.ndo_open	= sirdev_open,
+	.ndo_stop	= sirdev_close,
+	.ndo_do_ioctl	= sirdev_ioctl,
+};
+/* ----------------------------------------------------------------------------- */
+
+struct sir_dev * sirdev_get_instance(const struct sir_driver *drv, const char *name)
+{
+	struct net_device *ndev;
+	struct sir_dev *dev;
+
+	pr_debug("%s - %s\n", __func__, name);
+
+	/* instead of adding tests to protect against drv->do_write==NULL
+	 * at several places we refuse to create a sir_dev instance for
+	 * drivers which don't implement do_write.
+	 */
+	if (!drv ||  !drv->do_write)
+		return NULL;
+
+	/*
+	 *  Allocate new instance of the device
+	 */
+	ndev = alloc_irdadev(sizeof(*dev));
+	if (ndev == NULL) {
+		net_err_ratelimited("%s - Can't allocate memory for IrDA control block!\n",
+				    __func__);
+		goto out;
+	}
+	dev = netdev_priv(ndev);
+
+	irda_init_max_qos_capabilies(&dev->qos);
+	dev->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
+	dev->qos.min_turn_time.bits = drv->qos_mtt_bits;
+	irda_qos_bits_to_value(&dev->qos);
+
+	strncpy(dev->hwname, name, sizeof(dev->hwname)-1);
+
+	atomic_set(&dev->enable_rx, 0);
+	dev->tx_skb = NULL;
+
+	spin_lock_init(&dev->tx_lock);
+	sema_init(&dev->fsm.sem, 1);
+
+	dev->drv = drv;
+	dev->netdev = ndev;
+
+	/* Override the network functions we need to use */
+	ndev->netdev_ops = &sirdev_ops;
+
+	if (register_netdev(ndev)) {
+		net_err_ratelimited("%s(), register_netdev() failed!\n",
+				    __func__);
+		goto out_freenetdev;
+	}
+
+	return dev;
+
+out_freenetdev:
+	free_netdev(ndev);
+out:
+	return NULL;
+}
+EXPORT_SYMBOL(sirdev_get_instance);
+
+int sirdev_put_instance(struct sir_dev *dev)
+{
+	int err = 0;
+
+	pr_debug("%s\n", __func__);
+
+	atomic_set(&dev->enable_rx, 0);
+
+	netif_carrier_off(dev->netdev);
+	netif_device_detach(dev->netdev);
+
+	if (dev->dongle_drv)
+		err = sirdev_schedule_dongle_close(dev);
+	if (err)
+		net_err_ratelimited("%s - error %d\n", __func__, err);
+
+	sirdev_close(dev->netdev);
+
+	down(&dev->fsm.sem);
+	dev->fsm.state = SIRDEV_STATE_DEAD;	/* mark staled */
+	dev->dongle_drv = NULL;
+	dev->priv = NULL;
+	up(&dev->fsm.sem);
+
+	/* Remove netdevice */
+	unregister_netdev(dev->netdev);
+
+	free_netdev(dev->netdev);
+
+	return 0;
+}
+EXPORT_SYMBOL(sirdev_put_instance);
+
+static int __init sir_wq_init(void)
+{
+	irda_sir_wq = create_singlethread_workqueue("irda_sir_wq");
+	if (!irda_sir_wq)
+		return -ENOMEM;
+	return 0;
+}
+
+static void __exit sir_wq_exit(void)
+{
+	destroy_workqueue(irda_sir_wq);
+}
+
+module_init(sir_wq_init);
+module_exit(sir_wq_exit);
+
+MODULE_AUTHOR("Martin Diehl <info@mdiehl.de>");
+MODULE_DESCRIPTION("IrDA SIR core");
+MODULE_LICENSE("GPL");