677 lines
17 KiB
C
677 lines
17 KiB
C
/*********************************************************************
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*
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* sir_dev.c: irda sir network device
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*
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* Copyright (c) 2002 Martin Diehl
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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********************************************************************/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/smp_lock.h>
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#include <linux/delay.h>
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#include <net/irda/irda.h>
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#include <net/irda/wrapper.h>
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#include <net/irda/irda_device.h>
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#include "sir-dev.h"
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/***************************************************************************/
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void sirdev_enable_rx(struct sir_dev *dev)
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{
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if (unlikely(atomic_read(&dev->enable_rx)))
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return;
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/* flush rx-buffer - should also help in case of problems with echo cancelation */
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dev->rx_buff.data = dev->rx_buff.head;
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dev->rx_buff.len = 0;
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dev->rx_buff.in_frame = FALSE;
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dev->rx_buff.state = OUTSIDE_FRAME;
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atomic_set(&dev->enable_rx, 1);
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}
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static int sirdev_is_receiving(struct sir_dev *dev)
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{
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if (!atomic_read(&dev->enable_rx))
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return 0;
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return (dev->rx_buff.state != OUTSIDE_FRAME);
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}
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int sirdev_set_dongle(struct sir_dev *dev, IRDA_DONGLE type)
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{
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int err;
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IRDA_DEBUG(3, "%s : requesting dongle %d.\n", __FUNCTION__, type);
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err = sirdev_schedule_dongle_open(dev, type);
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if (unlikely(err))
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return err;
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down(&dev->fsm.sem); /* block until config change completed */
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err = dev->fsm.result;
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up(&dev->fsm.sem);
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return err;
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}
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/* used by dongle drivers for dongle programming */
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int sirdev_raw_write(struct sir_dev *dev, const char *buf, int len)
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{
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unsigned long flags;
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int ret;
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if (unlikely(len > dev->tx_buff.truesize))
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return -ENOSPC;
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spin_lock_irqsave(&dev->tx_lock, flags); /* serialize with other tx operations */
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while (dev->tx_buff.len > 0) { /* wait until tx idle */
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spin_unlock_irqrestore(&dev->tx_lock, flags);
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msleep(10);
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spin_lock_irqsave(&dev->tx_lock, flags);
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}
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dev->tx_buff.data = dev->tx_buff.head;
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memcpy(dev->tx_buff.data, buf, len);
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dev->tx_buff.len = len;
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ret = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
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if (ret > 0) {
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IRDA_DEBUG(3, "%s(), raw-tx started\n", __FUNCTION__);
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dev->tx_buff.data += ret;
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dev->tx_buff.len -= ret;
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dev->raw_tx = 1;
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ret = len; /* all data is going to be sent */
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}
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spin_unlock_irqrestore(&dev->tx_lock, flags);
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return ret;
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}
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/* seems some dongle drivers may need this */
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int sirdev_raw_read(struct sir_dev *dev, char *buf, int len)
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{
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int count;
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if (atomic_read(&dev->enable_rx))
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return -EIO; /* fail if we expect irda-frames */
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count = (len < dev->rx_buff.len) ? len : dev->rx_buff.len;
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if (count > 0) {
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memcpy(buf, dev->rx_buff.data, count);
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dev->rx_buff.data += count;
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dev->rx_buff.len -= count;
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}
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/* remaining stuff gets flushed when re-enabling normal rx */
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return count;
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}
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int sirdev_set_dtr_rts(struct sir_dev *dev, int dtr, int rts)
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{
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int ret = -ENXIO;
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if (dev->drv->set_dtr_rts != 0)
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ret = dev->drv->set_dtr_rts(dev, dtr, rts);
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return ret;
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}
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/**********************************************************************/
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/* called from client driver - likely with bh-context - to indicate
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* it made some progress with transmission. Hence we send the next
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* chunk, if any, or complete the skb otherwise
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*/
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void sirdev_write_complete(struct sir_dev *dev)
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{
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unsigned long flags;
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struct sk_buff *skb;
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int actual = 0;
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int err;
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spin_lock_irqsave(&dev->tx_lock, flags);
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IRDA_DEBUG(3, "%s() - dev->tx_buff.len = %d\n",
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__FUNCTION__, dev->tx_buff.len);
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if (likely(dev->tx_buff.len > 0)) {
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/* Write data left in transmit buffer */
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actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
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if (likely(actual>0)) {
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dev->tx_buff.data += actual;
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dev->tx_buff.len -= actual;
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}
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else if (unlikely(actual<0)) {
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/* could be dropped later when we have tx_timeout to recover */
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IRDA_ERROR("%s: drv->do_write failed (%d)\n",
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__FUNCTION__, actual);
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if ((skb=dev->tx_skb) != NULL) {
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dev->tx_skb = NULL;
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dev_kfree_skb_any(skb);
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dev->stats.tx_errors++;
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dev->stats.tx_dropped++;
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}
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dev->tx_buff.len = 0;
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}
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if (dev->tx_buff.len > 0)
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goto done; /* more data to send later */
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}
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if (unlikely(dev->raw_tx != 0)) {
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/* in raw mode we are just done now after the buffer was sent
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* completely. Since this was requested by some dongle driver
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* running under the control of the irda-thread we must take
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* care here not to re-enable the queue. The queue will be
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* restarted when the irda-thread has completed the request.
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*/
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IRDA_DEBUG(3, "%s(), raw-tx done\n", __FUNCTION__);
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dev->raw_tx = 0;
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goto done; /* no post-frame handling in raw mode */
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}
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/* we have finished now sending this skb.
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* update statistics and free the skb.
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* finally we check and trigger a pending speed change, if any.
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* if not we switch to rx mode and wake the queue for further
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* packets.
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* note the scheduled speed request blocks until the lower
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* client driver and the corresponding hardware has really
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* finished sending all data (xmit fifo drained f.e.)
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* before the speed change gets finally done and the queue
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* re-activated.
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*/
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IRDA_DEBUG(5, "%s(), finished with frame!\n", __FUNCTION__);
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if ((skb=dev->tx_skb) != NULL) {
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dev->tx_skb = NULL;
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += skb->len;
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dev_kfree_skb_any(skb);
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}
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if (unlikely(dev->new_speed > 0)) {
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IRDA_DEBUG(5, "%s(), Changing speed!\n", __FUNCTION__);
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err = sirdev_schedule_speed(dev, dev->new_speed);
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if (unlikely(err)) {
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/* should never happen
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* forget the speed change and hope the stack recovers
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*/
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IRDA_ERROR("%s - schedule speed change failed: %d\n",
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__FUNCTION__, err);
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netif_wake_queue(dev->netdev);
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}
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/* else: success
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* speed change in progress now
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* on completion dev->new_speed gets cleared,
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* rx-reenabled and the queue restarted
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*/
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}
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else {
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sirdev_enable_rx(dev);
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netif_wake_queue(dev->netdev);
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}
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done:
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spin_unlock_irqrestore(&dev->tx_lock, flags);
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}
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/* called from client driver - likely with bh-context - to give us
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* some more received bytes. We put them into the rx-buffer,
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* normally unwrapping and building LAP-skb's (unless rx disabled)
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*/
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int sirdev_receive(struct sir_dev *dev, const unsigned char *cp, size_t count)
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{
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if (!dev || !dev->netdev) {
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IRDA_WARNING("%s(), not ready yet!\n", __FUNCTION__);
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return -1;
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}
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if (!dev->irlap) {
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IRDA_WARNING("%s - too early: %p / %zd!\n",
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__FUNCTION__, cp, count);
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return -1;
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}
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if (cp==NULL) {
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/* error already at lower level receive
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* just update stats and set media busy
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*/
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irda_device_set_media_busy(dev->netdev, TRUE);
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dev->stats.rx_dropped++;
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IRDA_DEBUG(0, "%s; rx-drop: %zd\n", __FUNCTION__, count);
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return 0;
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}
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/* Read the characters into the buffer */
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if (likely(atomic_read(&dev->enable_rx))) {
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while (count--)
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/* Unwrap and destuff one byte */
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async_unwrap_char(dev->netdev, &dev->stats,
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&dev->rx_buff, *cp++);
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} else {
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while (count--) {
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/* rx not enabled: save the raw bytes and never
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* trigger any netif_rx. The received bytes are flushed
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* later when we re-enable rx but might be read meanwhile
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* by the dongle driver.
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*/
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dev->rx_buff.data[dev->rx_buff.len++] = *cp++;
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/* What should we do when the buffer is full? */
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if (unlikely(dev->rx_buff.len == dev->rx_buff.truesize))
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dev->rx_buff.len = 0;
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}
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}
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return 0;
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}
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/**********************************************************************/
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/* callbacks from network layer */
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static struct net_device_stats *sirdev_get_stats(struct net_device *ndev)
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{
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struct sir_dev *dev = ndev->priv;
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return (dev) ? &dev->stats : NULL;
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}
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static int sirdev_hard_xmit(struct sk_buff *skb, struct net_device *ndev)
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{
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struct sir_dev *dev = ndev->priv;
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unsigned long flags;
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int actual = 0;
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int err;
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s32 speed;
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IRDA_ASSERT(dev != NULL, return 0;);
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netif_stop_queue(ndev);
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IRDA_DEBUG(3, "%s(), skb->len = %d\n", __FUNCTION__, skb->len);
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speed = irda_get_next_speed(skb);
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if ((speed != dev->speed) && (speed != -1)) {
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if (!skb->len) {
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err = sirdev_schedule_speed(dev, speed);
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if (unlikely(err == -EWOULDBLOCK)) {
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/* Failed to initiate the speed change, likely the fsm
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* is still busy (pretty unlikely, but...)
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* We refuse to accept the skb and return with the queue
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* stopped so the network layer will retry after the
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* fsm completes and wakes the queue.
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*/
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return 1;
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}
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else if (unlikely(err)) {
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/* other fatal error - forget the speed change and
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* hope the stack will recover somehow
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*/
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netif_start_queue(ndev);
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}
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/* else: success
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* speed change in progress now
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* on completion the queue gets restarted
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*/
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dev_kfree_skb_any(skb);
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return 0;
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} else
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dev->new_speed = speed;
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}
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/* Init tx buffer*/
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dev->tx_buff.data = dev->tx_buff.head;
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/* Check problems */
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if(spin_is_locked(&dev->tx_lock)) {
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IRDA_DEBUG(3, "%s(), write not completed\n", __FUNCTION__);
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}
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/* serialize with write completion */
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spin_lock_irqsave(&dev->tx_lock, flags);
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/* Copy skb to tx_buff while wrapping, stuffing and making CRC */
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dev->tx_buff.len = async_wrap_skb(skb, dev->tx_buff.data, dev->tx_buff.truesize);
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/* transmission will start now - disable receive.
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* if we are just in the middle of an incoming frame,
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* treat it as collision. probably it's a good idea to
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* reset the rx_buf OUTSIDE_FRAME in this case too?
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*/
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atomic_set(&dev->enable_rx, 0);
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if (unlikely(sirdev_is_receiving(dev)))
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dev->stats.collisions++;
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actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
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if (likely(actual > 0)) {
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dev->tx_skb = skb;
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ndev->trans_start = jiffies;
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dev->tx_buff.data += actual;
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dev->tx_buff.len -= actual;
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}
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else if (unlikely(actual < 0)) {
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/* could be dropped later when we have tx_timeout to recover */
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IRDA_ERROR("%s: drv->do_write failed (%d)\n",
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__FUNCTION__, actual);
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dev_kfree_skb_any(skb);
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dev->stats.tx_errors++;
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dev->stats.tx_dropped++;
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netif_wake_queue(ndev);
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}
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spin_unlock_irqrestore(&dev->tx_lock, flags);
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return 0;
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}
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/* called from network layer with rtnl hold */
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static int sirdev_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
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{
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struct if_irda_req *irq = (struct if_irda_req *) rq;
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struct sir_dev *dev = ndev->priv;
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int ret = 0;
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IRDA_ASSERT(dev != NULL, return -1;);
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IRDA_DEBUG(3, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, ndev->name, cmd);
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switch (cmd) {
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case SIOCSBANDWIDTH: /* Set bandwidth */
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if (!capable(CAP_NET_ADMIN))
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ret = -EPERM;
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else
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ret = sirdev_schedule_speed(dev, irq->ifr_baudrate);
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/* cannot sleep here for completion
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* we are called from network layer with rtnl hold
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*/
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break;
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case SIOCSDONGLE: /* Set dongle */
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if (!capable(CAP_NET_ADMIN))
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ret = -EPERM;
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else
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ret = sirdev_schedule_dongle_open(dev, irq->ifr_dongle);
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/* cannot sleep here for completion
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* we are called from network layer with rtnl hold
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*/
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break;
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case SIOCSMEDIABUSY: /* Set media busy */
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if (!capable(CAP_NET_ADMIN))
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ret = -EPERM;
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else
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irda_device_set_media_busy(dev->netdev, TRUE);
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break;
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case SIOCGRECEIVING: /* Check if we are receiving right now */
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irq->ifr_receiving = sirdev_is_receiving(dev);
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break;
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case SIOCSDTRRTS:
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if (!capable(CAP_NET_ADMIN))
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ret = -EPERM;
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else
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ret = sirdev_schedule_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts);
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/* cannot sleep here for completion
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* we are called from network layer with rtnl hold
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*/
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break;
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case SIOCSMODE:
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#if 0
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if (!capable(CAP_NET_ADMIN))
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ret = -EPERM;
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else
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ret = sirdev_schedule_mode(dev, irq->ifr_mode);
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/* cannot sleep here for completion
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* we are called from network layer with rtnl hold
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*/
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break;
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#endif
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default:
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ret = -EOPNOTSUPP;
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}
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return ret;
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}
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/* ----------------------------------------------------------------------------- */
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#define SIRBUF_ALLOCSIZE 4269 /* worst case size of a wrapped IrLAP frame */
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static int sirdev_alloc_buffers(struct sir_dev *dev)
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{
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dev->tx_buff.truesize = SIRBUF_ALLOCSIZE;
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dev->rx_buff.truesize = IRDA_SKB_MAX_MTU;
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/* Bootstrap ZeroCopy Rx */
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dev->rx_buff.skb = __dev_alloc_skb(dev->rx_buff.truesize, GFP_KERNEL);
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if (dev->rx_buff.skb == NULL)
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return -ENOMEM;
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skb_reserve(dev->rx_buff.skb, 1);
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dev->rx_buff.head = dev->rx_buff.skb->data;
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dev->tx_buff.head = kmalloc(dev->tx_buff.truesize, GFP_KERNEL);
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if (dev->tx_buff.head == NULL) {
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kfree_skb(dev->rx_buff.skb);
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dev->rx_buff.skb = NULL;
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dev->rx_buff.head = NULL;
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return -ENOMEM;
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}
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dev->tx_buff.data = dev->tx_buff.head;
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dev->rx_buff.data = dev->rx_buff.head;
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dev->tx_buff.len = 0;
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dev->rx_buff.len = 0;
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dev->rx_buff.in_frame = FALSE;
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dev->rx_buff.state = OUTSIDE_FRAME;
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return 0;
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};
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static void sirdev_free_buffers(struct sir_dev *dev)
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{
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if (dev->rx_buff.skb)
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kfree_skb(dev->rx_buff.skb);
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kfree(dev->tx_buff.head);
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dev->rx_buff.head = dev->tx_buff.head = NULL;
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dev->rx_buff.skb = NULL;
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}
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static int sirdev_open(struct net_device *ndev)
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{
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struct sir_dev *dev = ndev->priv;
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const struct sir_driver *drv = dev->drv;
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if (!drv)
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return -ENODEV;
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/* increase the reference count of the driver module before doing serious stuff */
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if (!try_module_get(drv->owner))
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return -ESTALE;
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IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
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if (sirdev_alloc_buffers(dev))
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goto errout_dec;
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if (!dev->drv->start_dev || dev->drv->start_dev(dev))
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goto errout_free;
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sirdev_enable_rx(dev);
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dev->raw_tx = 0;
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netif_start_queue(ndev);
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dev->irlap = irlap_open(ndev, &dev->qos, dev->hwname);
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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;
|
|
}
|
|
|