#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 "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:
+ IRDA_ERROR("%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;
+
+ IRDA_DEBUG(2, "%s(), <%ld>\n", __func__, jiffies);
+
+ do {
+ IRDA_DEBUG(3, "%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->reset) {
+ 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:
+ IRDA_ERROR("%s - undefined state\n", __func__);
+ fsm->result = -EINVAL;
+ /* fall thru */
+
+ case SIRDEV_STATE_ERROR:
+ IRDA_ERROR("%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;
+
+ IRDA_DEBUG(2, "%s - state=0x%04x / param=%u\n", __func__,
+ initial_state, param);
+
+ if (down_trylock(&fsm->sem)) {
+ if (in_interrupt() || in_atomic() || irqs_disabled()) {
+ IRDA_DEBUG(1, "%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 */
+ IRDA_ERROR("%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)
{
int err;
- IRDA_DEBUG(3, "%s : requesting dongle %d.\n", __FUNCTION__, type);
+ IRDA_DEBUG(3, "%s : requesting dongle %d.\n", __func__, type);
err = sirdev_schedule_dongle_open(dev, type);
if (unlikely(err))
up(&dev->fsm.sem);
return err;
}
+EXPORT_SYMBOL(sirdev_set_dongle);
/* used by dongle drivers for dongle programming */
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__);
+ IRDA_DEBUG(3, "%s(), raw-tx started\n", __func__);
dev->tx_buff.data += ret;
dev->tx_buff.len -= ret;
spin_unlock_irqrestore(&dev->tx_lock, flags);
return ret;
}
+EXPORT_SYMBOL(sirdev_raw_write);
/* seems some dongle drivers may need this */
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 != 0)
+ 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
spin_lock_irqsave(&dev->tx_lock, flags);
IRDA_DEBUG(3, "%s() - dev->tx_buff.len = %d\n",
- __FUNCTION__, dev->tx_buff.len);
+ __func__, dev->tx_buff.len);
if (likely(dev->tx_buff.len > 0)) {
/* Write data left in transmit buffer */
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);
+ __func__, 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->netdev->stats.tx_errors++;
+ dev->netdev->stats.tx_dropped++;
}
dev->tx_buff.len = 0;
}
* restarted when the irda-thread has completed the request.
*/
- IRDA_DEBUG(3, "%s(), raw-tx done\n", __FUNCTION__);
+ IRDA_DEBUG(3, "%s(), raw-tx done\n", __func__);
dev->raw_tx = 0;
goto done; /* no post-frame handling in raw mode */
}
* re-activated.
*/
- IRDA_DEBUG(5, "%s(), finished with frame!\n", __FUNCTION__);
+ IRDA_DEBUG(5, "%s(), finished with frame!\n", __func__);
if ((skb=dev->tx_skb) != NULL) {
dev->tx_skb = NULL;
- dev->stats.tx_packets++;
- dev->stats.tx_bytes += skb->len;
+ dev->netdev->stats.tx_packets++;
+ dev->netdev->stats.tx_bytes += skb->len;
dev_kfree_skb_any(skb);
}
if (unlikely(dev->new_speed > 0)) {
- IRDA_DEBUG(5, "%s(), Changing speed!\n", __FUNCTION__);
+ IRDA_DEBUG(5, "%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
*/
IRDA_ERROR("%s - schedule speed change failed: %d\n",
- __FUNCTION__, err);
+ __func__, err);
netif_wake_queue(dev->netdev);
}
/* else: success
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,
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__);
+ IRDA_WARNING("%s(), not ready yet!\n", __func__);
return -1;
}
if (!dev->irlap) {
IRDA_WARNING("%s - too early: %p / %zd!\n",
- __FUNCTION__, cp, count);
+ __func__, cp, count);
return -1;
}
* 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);
+ dev->netdev->stats.rx_dropped++;
+ IRDA_DEBUG(0, "%s; rx-drop: %zd\n", __func__, count);
return 0;
}
if (likely(atomic_read(&dev->enable_rx))) {
while (count--)
/* Unwrap and destuff one byte */
- async_unwrap_char(dev->netdev, &dev->stats,
+ async_unwrap_char(dev->netdev, &dev->netdev->stats,
&dev->rx_buff, *cp++);
} else {
while (count--) {
return 0;
}
+EXPORT_SYMBOL(sirdev_receive);
/**********************************************************************/
/* 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)
+static netdev_tx_t sirdev_hard_xmit(struct sk_buff *skb,
+ struct net_device *ndev)
{
- struct sir_dev *dev = ndev->priv;
+ struct sir_dev *dev = netdev_priv(ndev);
unsigned long flags;
int actual = 0;
int err;
s32 speed;
- IRDA_ASSERT(dev != NULL, return 0;);
+ IRDA_ASSERT(dev != NULL, return NETDEV_TX_OK;);
netif_stop_queue(ndev);
- IRDA_DEBUG(3, "%s(), skb->len = %d\n", __FUNCTION__, skb->len);
+ IRDA_DEBUG(3, "%s(), skb->len = %d\n", __func__, skb->len);
speed = irda_get_next_speed(skb);
if ((speed != dev->speed) && (speed != -1)) {
* stopped so the network layer will retry after the
* fsm completes and wakes the queue.
*/
- return 1;
+ return NETDEV_TX_BUSY;
}
else if (unlikely(err)) {
/* other fatal error - forget the speed change and
*/
dev_kfree_skb_any(skb);
- return 0;
+ return NETDEV_TX_OK;
} else
dev->new_speed = speed;
}
/* Check problems */
if(spin_is_locked(&dev->tx_lock)) {
- IRDA_DEBUG(3, "%s(), write not completed\n", __FUNCTION__);
+ IRDA_DEBUG(3, "%s(), write not completed\n", __func__);
}
/* serialize with write completion */
*/
atomic_set(&dev->enable_rx, 0);
if (unlikely(sirdev_is_receiving(dev)))
- dev->stats.collisions++;
+ dev->netdev->stats.collisions++;
actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
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);
+ __func__, actual);
dev_kfree_skb_any(skb);
- dev->stats.tx_errors++;
- dev->stats.tx_dropped++;
+ dev->netdev->stats.tx_errors++;
+ dev->netdev->stats.tx_dropped++;
netif_wake_queue(ndev);
}
spin_unlock_irqrestore(&dev->tx_lock, flags);
- return 0;
+ 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 = ndev->priv;
+ struct sir_dev *dev = netdev_priv(ndev);
int ret = 0;
IRDA_ASSERT(dev != NULL, return -1;);
- IRDA_DEBUG(3, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, ndev->name, cmd);
+ IRDA_DEBUG(3, "%s(), %s, (cmd=0x%X)\n", __func__, ndev->name, cmd);
switch (cmd) {
case SIOCSBANDWIDTH: /* Set bandwidth */
dev->rx_buff.truesize = IRDA_SKB_MAX_MTU;
/* Bootstrap ZeroCopy Rx */
- dev->rx_buff.skb = __dev_alloc_skb(dev->rx_buff.truesize, GFP_KERNEL);
+ 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);
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);
+ 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 = ndev->priv;
+ struct sir_dev *dev = netdev_priv(ndev);
const struct sir_driver *drv = dev->drv;
if (!drv)
if (!try_module_get(drv->owner))
return -ESTALE;
- IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+ IRDA_DEBUG(2, "%s()\n", __func__);
if (sirdev_alloc_buffers(dev))
goto errout_dec;
netif_wake_queue(ndev);
- IRDA_DEBUG(2, "%s - done, speed = %d\n", __FUNCTION__, dev->speed);
+ IRDA_DEBUG(2, "%s - done, speed = %d\n", __func__, dev->speed);
return 0;
static int sirdev_close(struct net_device *ndev)
{
- struct sir_dev *dev = ndev->priv;
+ struct sir_dev *dev = netdev_priv(ndev);
const struct sir_driver *drv;
-// IRDA_DEBUG(0, "%s\n", __FUNCTION__);
+// IRDA_DEBUG(0, "%s\n", __func__);
netif_stop_queue(ndev);
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;
- IRDA_DEBUG(0, "%s - %s\n", __FUNCTION__, name);
+ IRDA_DEBUG(0, "%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
*/
ndev = alloc_irdadev(sizeof(*dev));
if (ndev == NULL) {
- IRDA_ERROR("%s - Can't allocate memory for IrDA control block!\n", __FUNCTION__);
+ IRDA_ERROR("%s - Can't allocate memory for IrDA control block!\n", __func__);
goto out;
}
- dev = ndev->priv;
+ 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;
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;
+ ndev->netdev_ops = &sirdev_ops;
if (register_netdev(ndev)) {
- IRDA_ERROR("%s(), register_netdev() failed!\n", __FUNCTION__);
+ IRDA_ERROR("%s(), register_netdev() failed!\n", __func__);
goto out_freenetdev;
}
out:
return NULL;
}
+EXPORT_SYMBOL(sirdev_get_instance);
int sirdev_put_instance(struct sir_dev *dev)
{
int err = 0;
- IRDA_DEBUG(0, "%s\n", __FUNCTION__);
+ IRDA_DEBUG(0, "%s\n", __func__);
atomic_set(&dev->enable_rx, 0);
if (dev->dongle_drv)
err = sirdev_schedule_dongle_close(dev);
if (err)
- IRDA_ERROR("%s - error %d\n", __FUNCTION__, err);
+ IRDA_ERROR("%s - error %d\n", __func__, err);
sirdev_close(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");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff