Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 677 insertions, 0 deletions

diff --git a/drivers/net/irda/sir_dev.c b/drivers/net/irda/sir_dev.c
new file mode 100644
index 0000000..efc5a88
--- /dev/null
+++ b/drivers/net/irda/sir_dev.c
@@ -0,0 +1,677 @@
+/*********************************************************************
+ *
+ *	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/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/smp_lock.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"
+
+/***************************************************************************/
+
+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;
+
+	IRDA_DEBUG(3, "%s : requesting dongle %d.\n", __FUNCTION__, 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;
+}
+
+/* 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) {
+		IRDA_DEBUG(3, "%s(), raw-tx started\n", __FUNCTION__);
+
+		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;
+}
+
+/* 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;
+}
+
+int sirdev_set_dtr_rts(struct sir_dev *dev, int dtr, int rts)
+{
+	int ret = -ENXIO;
+	if (dev->drv->set_dtr_rts != 0)
+		ret =  dev->drv->set_dtr_rts(dev, dtr, rts);
+	return ret;
+}
+	
+/**********************************************************************/
+
+/* 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);
+
+	IRDA_DEBUG(3, "%s() - dev->tx_buff.len = %d\n",
+		   __FUNCTION__, 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 */
+			IRDA_ERROR("%s: drv->do_write failed (%d)\n",
+				   __FUNCTION__, actual);
+			if ((skb=dev->tx_skb) != NULL) {
+				dev->tx_skb = NULL;
+				dev_kfree_skb_any(skb);
+				dev->stats.tx_errors++;		      
+				dev->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.
+		 */
+
+		IRDA_DEBUG(3, "%s(), raw-tx done\n", __FUNCTION__);
+		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.
+	 */
+
+	IRDA_DEBUG(5, "%s(), finished with frame!\n", __FUNCTION__);
+		
+	if ((skb=dev->tx_skb) != NULL) {
+		dev->tx_skb = NULL;
+		dev->stats.tx_packets++;		      
+		dev->stats.tx_bytes += skb->len;
+		dev_kfree_skb_any(skb);
+	}
+
+	if (unlikely(dev->new_speed > 0)) {
+		IRDA_DEBUG(5, "%s(), Changing speed!\n", __FUNCTION__);
+		err = sirdev_schedule_speed(dev, dev->new_speed);
+		if (unlikely(err)) {
+			/* should never happen
+			 * forget the speed change and hope the stack recovers
+			 */
+			IRDA_ERROR("%s - schedule speed change failed: %d\n",
+				   __FUNCTION__, 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);
+}
+
+/* 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) {
+		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;
+}
+
+/**********************************************************************/
+
+/* callbacks from network layer */
+
+static struct net_device_stats *sirdev_get_stats(struct net_device *ndev)
+{
+	struct sir_dev *dev = ndev->priv;
+
+	return (dev) ? &dev->stats : NULL;
+}
+
+static int sirdev_hard_xmit(struct sk_buff *skb, struct net_device *ndev)
+{
+	struct sir_dev *dev = ndev->priv;
+	unsigned long flags;
+	int actual = 0;
+	int err;
+	s32 speed;
+
+	IRDA_ASSERT(dev != NULL, return 0;);
+
+	netif_stop_queue(ndev);
+
+	IRDA_DEBUG(3, "%s(), skb->len = %d\n", __FUNCTION__, 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 1;
+			}
+			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 0;
+		} 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)) {
+		IRDA_DEBUG(3, "%s(), write not completed\n", __FUNCTION__);
+	}
+
+	/* 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->stats.collisions++;
+
+	actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
+
+	if (likely(actual > 0)) {
+		dev->tx_skb = skb;
+		ndev->trans_start = jiffies;
+		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 */
+		IRDA_ERROR("%s: drv->do_write failed (%d)\n",
+			   __FUNCTION__, actual);
+		dev_kfree_skb_any(skb);
+		dev->stats.tx_errors++;		      
+		dev->stats.tx_dropped++;		      
+		netif_wake_queue(ndev);
+	}
+	spin_unlock_irqrestore(&dev->tx_lock, flags);
+
+	return 0;
+}
+
+/* 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 = ndev->priv;
+	int ret = 0;
+
+	IRDA_ASSERT(dev != NULL, return -1;);
+
+	IRDA_DEBUG(3, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, 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 = __dev_alloc_skb(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)
+{
+	if (dev->rx_buff.skb)
+		kfree_skb(dev->rx_buff.skb);
+	if (dev->tx_buff.head)
+		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 = ndev->priv;
+	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;
+
+	IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+
+	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);
+
+	IRDA_DEBUG(2, "%s - done, speed = %d\n", __FUNCTION__, 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 = ndev->priv;
+	const struct sir_driver *drv;
+
+//	IRDA_DEBUG(0, "%s\n", __FUNCTION__);
+
+	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;
+}
+
+/* ----------------------------------------------------------------------------- */
+
+struct sir_dev * sirdev_get_instance(const struct sir_driver *drv, const char *name)
+{
+	struct net_device *ndev;
+	struct sir_dev *dev;
+
+	IRDA_DEBUG(0, "%s - %s\n", __FUNCTION__, 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) {
+		IRDA_ERROR("%s - Can't allocate memory for IrDA control block!\n", __FUNCTION__);
+		goto out;
+	}
+	dev = ndev->priv;
+
+	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);
+	init_MUTEX(&dev->fsm.sem);
+
+	INIT_LIST_HEAD(&dev->fsm.rq.lh_request);
+	dev->fsm.rq.pending = 0;
+	init_timer(&dev->fsm.rq.timer);
+
+	dev->drv = drv;
+	dev->netdev = ndev;
+
+	SET_MODULE_OWNER(ndev);
+
+	/* Override the network functions we need to use */
+	ndev->hard_start_xmit = sirdev_hard_xmit;
+	ndev->open = sirdev_open;
+	ndev->stop = sirdev_close;
+	ndev->get_stats = sirdev_get_stats;
+	ndev->do_ioctl = sirdev_ioctl;
+
+	if (register_netdev(ndev)) {
+		IRDA_ERROR("%s(), register_netdev() failed!\n", __FUNCTION__);
+		goto out_freenetdev;
+	}
+
+	return dev;
+
+out_freenetdev:
+	free_netdev(ndev);
+out:
+	return NULL;
+}
+
+int sirdev_put_instance(struct sir_dev *dev)
+{
+	int err = 0;
+
+	IRDA_DEBUG(0, "%s\n", __FUNCTION__);
+
+	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)
+		IRDA_ERROR("%s - error %d\n", __FUNCTION__, 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;
+}
+