remove unused TIF_NOTIFY_RESUME flag
[pv_ops_mirror.git] / drivers / net / irda / sir_dev.c
blob9d6c8f391b2d594338bf457f3119363160d7cf07
1 /*********************************************************************
3 * sir_dev.c: irda sir network device
4 *
5 * Copyright (c) 2002 Martin Diehl
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
12 ********************************************************************/
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/delay.h>
19 #include <net/irda/irda.h>
20 #include <net/irda/wrapper.h>
21 #include <net/irda/irda_device.h>
23 #include "sir-dev.h"
26 static struct workqueue_struct *irda_sir_wq;
28 /* STATE MACHINE */
30 /* substate handler of the config-fsm to handle the cases where we want
31 * to wait for transmit completion before changing the port configuration
34 static int sirdev_tx_complete_fsm(struct sir_dev *dev)
36 struct sir_fsm *fsm = &dev->fsm;
37 unsigned next_state, delay;
38 unsigned bytes_left;
40 do {
41 next_state = fsm->substate; /* default: stay in current substate */
42 delay = 0;
44 switch(fsm->substate) {
46 case SIRDEV_STATE_WAIT_XMIT:
47 if (dev->drv->chars_in_buffer)
48 bytes_left = dev->drv->chars_in_buffer(dev);
49 else
50 bytes_left = 0;
51 if (!bytes_left) {
52 next_state = SIRDEV_STATE_WAIT_UNTIL_SENT;
53 break;
56 if (dev->speed > 115200)
57 delay = (bytes_left*8*10000) / (dev->speed/100);
58 else if (dev->speed > 0)
59 delay = (bytes_left*10*10000) / (dev->speed/100);
60 else
61 delay = 0;
62 /* expected delay (usec) until remaining bytes are sent */
63 if (delay < 100) {
64 udelay(delay);
65 delay = 0;
66 break;
68 /* sleep some longer delay (msec) */
69 delay = (delay+999) / 1000;
70 break;
72 case SIRDEV_STATE_WAIT_UNTIL_SENT:
73 /* block until underlaying hardware buffer are empty */
74 if (dev->drv->wait_until_sent)
75 dev->drv->wait_until_sent(dev);
76 next_state = SIRDEV_STATE_TX_DONE;
77 break;
79 case SIRDEV_STATE_TX_DONE:
80 return 0;
82 default:
83 IRDA_ERROR("%s - undefined state\n", __FUNCTION__);
84 return -EINVAL;
86 fsm->substate = next_state;
87 } while (delay == 0);
88 return delay;
92 * Function sirdev_config_fsm
94 * State machine to handle the configuration of the device (and attached dongle, if any).
95 * This handler is scheduled for execution in kIrDAd context, so we can sleep.
96 * however, kIrDAd is shared by all sir_dev devices so we better don't sleep there too
97 * long. Instead, for longer delays we start a timer to reschedule us later.
98 * On entry, fsm->sem is always locked and the netdev xmit queue stopped.
99 * Both must be unlocked/restarted on completion - but only on final exit.
102 static void sirdev_config_fsm(struct work_struct *work)
104 struct sir_dev *dev = container_of(work, struct sir_dev, fsm.work.work);
105 struct sir_fsm *fsm = &dev->fsm;
106 int next_state;
107 int ret = -1;
108 unsigned delay;
110 IRDA_DEBUG(2, "%s(), <%ld>\n", __FUNCTION__, jiffies);
112 do {
113 IRDA_DEBUG(3, "%s - state=0x%04x / substate=0x%04x\n",
114 __FUNCTION__, fsm->state, fsm->substate);
116 next_state = fsm->state;
117 delay = 0;
119 switch(fsm->state) {
121 case SIRDEV_STATE_DONGLE_OPEN:
122 if (dev->dongle_drv != NULL) {
123 ret = sirdev_put_dongle(dev);
124 if (ret) {
125 fsm->result = -EINVAL;
126 next_state = SIRDEV_STATE_ERROR;
127 break;
131 /* Initialize dongle */
132 ret = sirdev_get_dongle(dev, fsm->param);
133 if (ret) {
134 fsm->result = ret;
135 next_state = SIRDEV_STATE_ERROR;
136 break;
139 /* Dongles are powered through the modem control lines which
140 * were just set during open. Before resetting, let's wait for
141 * the power to stabilize. This is what some dongle drivers did
142 * in open before, while others didn't - should be safe anyway.
145 delay = 50;
146 fsm->substate = SIRDEV_STATE_DONGLE_RESET;
147 next_state = SIRDEV_STATE_DONGLE_RESET;
149 fsm->param = 9600;
151 break;
153 case SIRDEV_STATE_DONGLE_CLOSE:
154 /* shouldn't we just treat this as success=? */
155 if (dev->dongle_drv == NULL) {
156 fsm->result = -EINVAL;
157 next_state = SIRDEV_STATE_ERROR;
158 break;
161 ret = sirdev_put_dongle(dev);
162 if (ret) {
163 fsm->result = ret;
164 next_state = SIRDEV_STATE_ERROR;
165 break;
167 next_state = SIRDEV_STATE_DONE;
168 break;
170 case SIRDEV_STATE_SET_DTR_RTS:
171 ret = sirdev_set_dtr_rts(dev,
172 (fsm->param&0x02) ? TRUE : FALSE,
173 (fsm->param&0x01) ? TRUE : FALSE);
174 next_state = SIRDEV_STATE_DONE;
175 break;
177 case SIRDEV_STATE_SET_SPEED:
178 fsm->substate = SIRDEV_STATE_WAIT_XMIT;
179 next_state = SIRDEV_STATE_DONGLE_CHECK;
180 break;
182 case SIRDEV_STATE_DONGLE_CHECK:
183 ret = sirdev_tx_complete_fsm(dev);
184 if (ret < 0) {
185 fsm->result = ret;
186 next_state = SIRDEV_STATE_ERROR;
187 break;
189 if ((delay=ret) != 0)
190 break;
192 if (dev->dongle_drv) {
193 fsm->substate = SIRDEV_STATE_DONGLE_RESET;
194 next_state = SIRDEV_STATE_DONGLE_RESET;
196 else {
197 dev->speed = fsm->param;
198 next_state = SIRDEV_STATE_PORT_SPEED;
200 break;
202 case SIRDEV_STATE_DONGLE_RESET:
203 if (dev->dongle_drv->reset) {
204 ret = dev->dongle_drv->reset(dev);
205 if (ret < 0) {
206 fsm->result = ret;
207 next_state = SIRDEV_STATE_ERROR;
208 break;
211 else
212 ret = 0;
213 if ((delay=ret) == 0) {
214 /* set serial port according to dongle default speed */
215 if (dev->drv->set_speed)
216 dev->drv->set_speed(dev, dev->speed);
217 fsm->substate = SIRDEV_STATE_DONGLE_SPEED;
218 next_state = SIRDEV_STATE_DONGLE_SPEED;
220 break;
222 case SIRDEV_STATE_DONGLE_SPEED:
223 if (dev->dongle_drv->reset) {
224 ret = dev->dongle_drv->set_speed(dev, fsm->param);
225 if (ret < 0) {
226 fsm->result = ret;
227 next_state = SIRDEV_STATE_ERROR;
228 break;
231 else
232 ret = 0;
233 if ((delay=ret) == 0)
234 next_state = SIRDEV_STATE_PORT_SPEED;
235 break;
237 case SIRDEV_STATE_PORT_SPEED:
238 /* Finally we are ready to change the serial port speed */
239 if (dev->drv->set_speed)
240 dev->drv->set_speed(dev, dev->speed);
241 dev->new_speed = 0;
242 next_state = SIRDEV_STATE_DONE;
243 break;
245 case SIRDEV_STATE_DONE:
246 /* Signal network layer so it can send more frames */
247 netif_wake_queue(dev->netdev);
248 next_state = SIRDEV_STATE_COMPLETE;
249 break;
251 default:
252 IRDA_ERROR("%s - undefined state\n", __FUNCTION__);
253 fsm->result = -EINVAL;
254 /* fall thru */
256 case SIRDEV_STATE_ERROR:
257 IRDA_ERROR("%s - error: %d\n", __FUNCTION__, fsm->result);
259 #if 0 /* don't enable this before we have netdev->tx_timeout to recover */
260 netif_stop_queue(dev->netdev);
261 #else
262 netif_wake_queue(dev->netdev);
263 #endif
264 /* fall thru */
266 case SIRDEV_STATE_COMPLETE:
267 /* config change finished, so we are not busy any longer */
268 sirdev_enable_rx(dev);
269 up(&fsm->sem);
270 return;
272 fsm->state = next_state;
273 } while(!delay);
275 queue_delayed_work(irda_sir_wq, &fsm->work, msecs_to_jiffies(delay));
278 /* schedule some device configuration task for execution by kIrDAd
279 * on behalf of the above state machine.
280 * can be called from process or interrupt/tasklet context.
283 int sirdev_schedule_request(struct sir_dev *dev, int initial_state, unsigned param)
285 struct sir_fsm *fsm = &dev->fsm;
287 IRDA_DEBUG(2, "%s - state=0x%04x / param=%u\n", __FUNCTION__, initial_state, param);
289 if (down_trylock(&fsm->sem)) {
290 if (in_interrupt() || in_atomic() || irqs_disabled()) {
291 IRDA_DEBUG(1, "%s(), state machine busy!\n", __FUNCTION__);
292 return -EWOULDBLOCK;
293 } else
294 down(&fsm->sem);
297 if (fsm->state == SIRDEV_STATE_DEAD) {
298 /* race with sirdev_close should never happen */
299 IRDA_ERROR("%s(), instance staled!\n", __FUNCTION__);
300 up(&fsm->sem);
301 return -ESTALE; /* or better EPIPE? */
304 netif_stop_queue(dev->netdev);
305 atomic_set(&dev->enable_rx, 0);
307 fsm->state = initial_state;
308 fsm->param = param;
309 fsm->result = 0;
311 INIT_DELAYED_WORK(&fsm->work, sirdev_config_fsm);
312 queue_delayed_work(irda_sir_wq, &fsm->work, 0);
313 return 0;
317 /***************************************************************************/
319 void sirdev_enable_rx(struct sir_dev *dev)
321 if (unlikely(atomic_read(&dev->enable_rx)))
322 return;
324 /* flush rx-buffer - should also help in case of problems with echo cancelation */
325 dev->rx_buff.data = dev->rx_buff.head;
326 dev->rx_buff.len = 0;
327 dev->rx_buff.in_frame = FALSE;
328 dev->rx_buff.state = OUTSIDE_FRAME;
329 atomic_set(&dev->enable_rx, 1);
332 static int sirdev_is_receiving(struct sir_dev *dev)
334 if (!atomic_read(&dev->enable_rx))
335 return 0;
337 return (dev->rx_buff.state != OUTSIDE_FRAME);
340 int sirdev_set_dongle(struct sir_dev *dev, IRDA_DONGLE type)
342 int err;
344 IRDA_DEBUG(3, "%s : requesting dongle %d.\n", __FUNCTION__, type);
346 err = sirdev_schedule_dongle_open(dev, type);
347 if (unlikely(err))
348 return err;
349 down(&dev->fsm.sem); /* block until config change completed */
350 err = dev->fsm.result;
351 up(&dev->fsm.sem);
352 return err;
354 EXPORT_SYMBOL(sirdev_set_dongle);
356 /* used by dongle drivers for dongle programming */
358 int sirdev_raw_write(struct sir_dev *dev, const char *buf, int len)
360 unsigned long flags;
361 int ret;
363 if (unlikely(len > dev->tx_buff.truesize))
364 return -ENOSPC;
366 spin_lock_irqsave(&dev->tx_lock, flags); /* serialize with other tx operations */
367 while (dev->tx_buff.len > 0) { /* wait until tx idle */
368 spin_unlock_irqrestore(&dev->tx_lock, flags);
369 msleep(10);
370 spin_lock_irqsave(&dev->tx_lock, flags);
373 dev->tx_buff.data = dev->tx_buff.head;
374 memcpy(dev->tx_buff.data, buf, len);
375 dev->tx_buff.len = len;
377 ret = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
378 if (ret > 0) {
379 IRDA_DEBUG(3, "%s(), raw-tx started\n", __FUNCTION__);
381 dev->tx_buff.data += ret;
382 dev->tx_buff.len -= ret;
383 dev->raw_tx = 1;
384 ret = len; /* all data is going to be sent */
386 spin_unlock_irqrestore(&dev->tx_lock, flags);
387 return ret;
389 EXPORT_SYMBOL(sirdev_raw_write);
391 /* seems some dongle drivers may need this */
393 int sirdev_raw_read(struct sir_dev *dev, char *buf, int len)
395 int count;
397 if (atomic_read(&dev->enable_rx))
398 return -EIO; /* fail if we expect irda-frames */
400 count = (len < dev->rx_buff.len) ? len : dev->rx_buff.len;
402 if (count > 0) {
403 memcpy(buf, dev->rx_buff.data, count);
404 dev->rx_buff.data += count;
405 dev->rx_buff.len -= count;
408 /* remaining stuff gets flushed when re-enabling normal rx */
410 return count;
412 EXPORT_SYMBOL(sirdev_raw_read);
414 int sirdev_set_dtr_rts(struct sir_dev *dev, int dtr, int rts)
416 int ret = -ENXIO;
417 if (dev->drv->set_dtr_rts != 0)
418 ret = dev->drv->set_dtr_rts(dev, dtr, rts);
419 return ret;
421 EXPORT_SYMBOL(sirdev_set_dtr_rts);
423 /**********************************************************************/
425 /* called from client driver - likely with bh-context - to indicate
426 * it made some progress with transmission. Hence we send the next
427 * chunk, if any, or complete the skb otherwise
430 void sirdev_write_complete(struct sir_dev *dev)
432 unsigned long flags;
433 struct sk_buff *skb;
434 int actual = 0;
435 int err;
437 spin_lock_irqsave(&dev->tx_lock, flags);
439 IRDA_DEBUG(3, "%s() - dev->tx_buff.len = %d\n",
440 __FUNCTION__, dev->tx_buff.len);
442 if (likely(dev->tx_buff.len > 0)) {
443 /* Write data left in transmit buffer */
444 actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
446 if (likely(actual>0)) {
447 dev->tx_buff.data += actual;
448 dev->tx_buff.len -= actual;
450 else if (unlikely(actual<0)) {
451 /* could be dropped later when we have tx_timeout to recover */
452 IRDA_ERROR("%s: drv->do_write failed (%d)\n",
453 __FUNCTION__, actual);
454 if ((skb=dev->tx_skb) != NULL) {
455 dev->tx_skb = NULL;
456 dev_kfree_skb_any(skb);
457 dev->stats.tx_errors++;
458 dev->stats.tx_dropped++;
460 dev->tx_buff.len = 0;
462 if (dev->tx_buff.len > 0)
463 goto done; /* more data to send later */
466 if (unlikely(dev->raw_tx != 0)) {
467 /* in raw mode we are just done now after the buffer was sent
468 * completely. Since this was requested by some dongle driver
469 * running under the control of the irda-thread we must take
470 * care here not to re-enable the queue. The queue will be
471 * restarted when the irda-thread has completed the request.
474 IRDA_DEBUG(3, "%s(), raw-tx done\n", __FUNCTION__);
475 dev->raw_tx = 0;
476 goto done; /* no post-frame handling in raw mode */
479 /* we have finished now sending this skb.
480 * update statistics and free the skb.
481 * finally we check and trigger a pending speed change, if any.
482 * if not we switch to rx mode and wake the queue for further
483 * packets.
484 * note the scheduled speed request blocks until the lower
485 * client driver and the corresponding hardware has really
486 * finished sending all data (xmit fifo drained f.e.)
487 * before the speed change gets finally done and the queue
488 * re-activated.
491 IRDA_DEBUG(5, "%s(), finished with frame!\n", __FUNCTION__);
493 if ((skb=dev->tx_skb) != NULL) {
494 dev->tx_skb = NULL;
495 dev->stats.tx_packets++;
496 dev->stats.tx_bytes += skb->len;
497 dev_kfree_skb_any(skb);
500 if (unlikely(dev->new_speed > 0)) {
501 IRDA_DEBUG(5, "%s(), Changing speed!\n", __FUNCTION__);
502 err = sirdev_schedule_speed(dev, dev->new_speed);
503 if (unlikely(err)) {
504 /* should never happen
505 * forget the speed change and hope the stack recovers
507 IRDA_ERROR("%s - schedule speed change failed: %d\n",
508 __FUNCTION__, err);
509 netif_wake_queue(dev->netdev);
511 /* else: success
512 * speed change in progress now
513 * on completion dev->new_speed gets cleared,
514 * rx-reenabled and the queue restarted
517 else {
518 sirdev_enable_rx(dev);
519 netif_wake_queue(dev->netdev);
522 done:
523 spin_unlock_irqrestore(&dev->tx_lock, flags);
525 EXPORT_SYMBOL(sirdev_write_complete);
527 /* called from client driver - likely with bh-context - to give us
528 * some more received bytes. We put them into the rx-buffer,
529 * normally unwrapping and building LAP-skb's (unless rx disabled)
532 int sirdev_receive(struct sir_dev *dev, const unsigned char *cp, size_t count)
534 if (!dev || !dev->netdev) {
535 IRDA_WARNING("%s(), not ready yet!\n", __FUNCTION__);
536 return -1;
539 if (!dev->irlap) {
540 IRDA_WARNING("%s - too early: %p / %zd!\n",
541 __FUNCTION__, cp, count);
542 return -1;
545 if (cp==NULL) {
546 /* error already at lower level receive
547 * just update stats and set media busy
549 irda_device_set_media_busy(dev->netdev, TRUE);
550 dev->stats.rx_dropped++;
551 IRDA_DEBUG(0, "%s; rx-drop: %zd\n", __FUNCTION__, count);
552 return 0;
555 /* Read the characters into the buffer */
556 if (likely(atomic_read(&dev->enable_rx))) {
557 while (count--)
558 /* Unwrap and destuff one byte */
559 async_unwrap_char(dev->netdev, &dev->stats,
560 &dev->rx_buff, *cp++);
561 } else {
562 while (count--) {
563 /* rx not enabled: save the raw bytes and never
564 * trigger any netif_rx. The received bytes are flushed
565 * later when we re-enable rx but might be read meanwhile
566 * by the dongle driver.
568 dev->rx_buff.data[dev->rx_buff.len++] = *cp++;
570 /* What should we do when the buffer is full? */
571 if (unlikely(dev->rx_buff.len == dev->rx_buff.truesize))
572 dev->rx_buff.len = 0;
576 return 0;
578 EXPORT_SYMBOL(sirdev_receive);
580 /**********************************************************************/
582 /* callbacks from network layer */
584 static struct net_device_stats *sirdev_get_stats(struct net_device *ndev)
586 struct sir_dev *dev = ndev->priv;
588 return (dev) ? &dev->stats : NULL;
591 static int sirdev_hard_xmit(struct sk_buff *skb, struct net_device *ndev)
593 struct sir_dev *dev = ndev->priv;
594 unsigned long flags;
595 int actual = 0;
596 int err;
597 s32 speed;
599 IRDA_ASSERT(dev != NULL, return 0;);
601 netif_stop_queue(ndev);
603 IRDA_DEBUG(3, "%s(), skb->len = %d\n", __FUNCTION__, skb->len);
605 speed = irda_get_next_speed(skb);
606 if ((speed != dev->speed) && (speed != -1)) {
607 if (!skb->len) {
608 err = sirdev_schedule_speed(dev, speed);
609 if (unlikely(err == -EWOULDBLOCK)) {
610 /* Failed to initiate the speed change, likely the fsm
611 * is still busy (pretty unlikely, but...)
612 * We refuse to accept the skb and return with the queue
613 * stopped so the network layer will retry after the
614 * fsm completes and wakes the queue.
616 return 1;
618 else if (unlikely(err)) {
619 /* other fatal error - forget the speed change and
620 * hope the stack will recover somehow
622 netif_start_queue(ndev);
624 /* else: success
625 * speed change in progress now
626 * on completion the queue gets restarted
629 dev_kfree_skb_any(skb);
630 return 0;
631 } else
632 dev->new_speed = speed;
635 /* Init tx buffer*/
636 dev->tx_buff.data = dev->tx_buff.head;
638 /* Check problems */
639 if(spin_is_locked(&dev->tx_lock)) {
640 IRDA_DEBUG(3, "%s(), write not completed\n", __FUNCTION__);
643 /* serialize with write completion */
644 spin_lock_irqsave(&dev->tx_lock, flags);
646 /* Copy skb to tx_buff while wrapping, stuffing and making CRC */
647 dev->tx_buff.len = async_wrap_skb(skb, dev->tx_buff.data, dev->tx_buff.truesize);
649 /* transmission will start now - disable receive.
650 * if we are just in the middle of an incoming frame,
651 * treat it as collision. probably it's a good idea to
652 * reset the rx_buf OUTSIDE_FRAME in this case too?
654 atomic_set(&dev->enable_rx, 0);
655 if (unlikely(sirdev_is_receiving(dev)))
656 dev->stats.collisions++;
658 actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
660 if (likely(actual > 0)) {
661 dev->tx_skb = skb;
662 ndev->trans_start = jiffies;
663 dev->tx_buff.data += actual;
664 dev->tx_buff.len -= actual;
666 else if (unlikely(actual < 0)) {
667 /* could be dropped later when we have tx_timeout to recover */
668 IRDA_ERROR("%s: drv->do_write failed (%d)\n",
669 __FUNCTION__, actual);
670 dev_kfree_skb_any(skb);
671 dev->stats.tx_errors++;
672 dev->stats.tx_dropped++;
673 netif_wake_queue(ndev);
675 spin_unlock_irqrestore(&dev->tx_lock, flags);
677 return 0;
680 /* called from network layer with rtnl hold */
682 static int sirdev_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
684 struct if_irda_req *irq = (struct if_irda_req *) rq;
685 struct sir_dev *dev = ndev->priv;
686 int ret = 0;
688 IRDA_ASSERT(dev != NULL, return -1;);
690 IRDA_DEBUG(3, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, ndev->name, cmd);
692 switch (cmd) {
693 case SIOCSBANDWIDTH: /* Set bandwidth */
694 if (!capable(CAP_NET_ADMIN))
695 ret = -EPERM;
696 else
697 ret = sirdev_schedule_speed(dev, irq->ifr_baudrate);
698 /* cannot sleep here for completion
699 * we are called from network layer with rtnl hold
701 break;
703 case SIOCSDONGLE: /* Set dongle */
704 if (!capable(CAP_NET_ADMIN))
705 ret = -EPERM;
706 else
707 ret = sirdev_schedule_dongle_open(dev, irq->ifr_dongle);
708 /* cannot sleep here for completion
709 * we are called from network layer with rtnl hold
711 break;
713 case SIOCSMEDIABUSY: /* Set media busy */
714 if (!capable(CAP_NET_ADMIN))
715 ret = -EPERM;
716 else
717 irda_device_set_media_busy(dev->netdev, TRUE);
718 break;
720 case SIOCGRECEIVING: /* Check if we are receiving right now */
721 irq->ifr_receiving = sirdev_is_receiving(dev);
722 break;
724 case SIOCSDTRRTS:
725 if (!capable(CAP_NET_ADMIN))
726 ret = -EPERM;
727 else
728 ret = sirdev_schedule_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts);
729 /* cannot sleep here for completion
730 * we are called from network layer with rtnl hold
732 break;
734 case SIOCSMODE:
735 #if 0
736 if (!capable(CAP_NET_ADMIN))
737 ret = -EPERM;
738 else
739 ret = sirdev_schedule_mode(dev, irq->ifr_mode);
740 /* cannot sleep here for completion
741 * we are called from network layer with rtnl hold
743 break;
744 #endif
745 default:
746 ret = -EOPNOTSUPP;
749 return ret;
752 /* ----------------------------------------------------------------------------- */
754 #define SIRBUF_ALLOCSIZE 4269 /* worst case size of a wrapped IrLAP frame */
756 static int sirdev_alloc_buffers(struct sir_dev *dev)
758 dev->tx_buff.truesize = SIRBUF_ALLOCSIZE;
759 dev->rx_buff.truesize = IRDA_SKB_MAX_MTU;
761 /* Bootstrap ZeroCopy Rx */
762 dev->rx_buff.skb = __dev_alloc_skb(dev->rx_buff.truesize, GFP_KERNEL);
763 if (dev->rx_buff.skb == NULL)
764 return -ENOMEM;
765 skb_reserve(dev->rx_buff.skb, 1);
766 dev->rx_buff.head = dev->rx_buff.skb->data;
768 dev->tx_buff.head = kmalloc(dev->tx_buff.truesize, GFP_KERNEL);
769 if (dev->tx_buff.head == NULL) {
770 kfree_skb(dev->rx_buff.skb);
771 dev->rx_buff.skb = NULL;
772 dev->rx_buff.head = NULL;
773 return -ENOMEM;
776 dev->tx_buff.data = dev->tx_buff.head;
777 dev->rx_buff.data = dev->rx_buff.head;
778 dev->tx_buff.len = 0;
779 dev->rx_buff.len = 0;
781 dev->rx_buff.in_frame = FALSE;
782 dev->rx_buff.state = OUTSIDE_FRAME;
783 return 0;
786 static void sirdev_free_buffers(struct sir_dev *dev)
788 if (dev->rx_buff.skb)
789 kfree_skb(dev->rx_buff.skb);
790 kfree(dev->tx_buff.head);
791 dev->rx_buff.head = dev->tx_buff.head = NULL;
792 dev->rx_buff.skb = NULL;
795 static int sirdev_open(struct net_device *ndev)
797 struct sir_dev *dev = ndev->priv;
798 const struct sir_driver *drv = dev->drv;
800 if (!drv)
801 return -ENODEV;
803 /* increase the reference count of the driver module before doing serious stuff */
804 if (!try_module_get(drv->owner))
805 return -ESTALE;
807 IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
809 if (sirdev_alloc_buffers(dev))
810 goto errout_dec;
812 if (!dev->drv->start_dev || dev->drv->start_dev(dev))
813 goto errout_free;
815 sirdev_enable_rx(dev);
816 dev->raw_tx = 0;
818 netif_start_queue(ndev);
819 dev->irlap = irlap_open(ndev, &dev->qos, dev->hwname);
820 if (!dev->irlap)
821 goto errout_stop;
823 netif_wake_queue(ndev);
825 IRDA_DEBUG(2, "%s - done, speed = %d\n", __FUNCTION__, dev->speed);
827 return 0;
829 errout_stop:
830 atomic_set(&dev->enable_rx, 0);
831 if (dev->drv->stop_dev)
832 dev->drv->stop_dev(dev);
833 errout_free:
834 sirdev_free_buffers(dev);
835 errout_dec:
836 module_put(drv->owner);
837 return -EAGAIN;
840 static int sirdev_close(struct net_device *ndev)
842 struct sir_dev *dev = ndev->priv;
843 const struct sir_driver *drv;
845 // IRDA_DEBUG(0, "%s\n", __FUNCTION__);
847 netif_stop_queue(ndev);
849 down(&dev->fsm.sem); /* block on pending config completion */
851 atomic_set(&dev->enable_rx, 0);
853 if (unlikely(!dev->irlap))
854 goto out;
855 irlap_close(dev->irlap);
856 dev->irlap = NULL;
858 drv = dev->drv;
859 if (unlikely(!drv || !dev->priv))
860 goto out;
862 if (drv->stop_dev)
863 drv->stop_dev(dev);
865 sirdev_free_buffers(dev);
866 module_put(drv->owner);
868 out:
869 dev->speed = 0;
870 up(&dev->fsm.sem);
871 return 0;
874 /* ----------------------------------------------------------------------------- */
876 struct sir_dev * sirdev_get_instance(const struct sir_driver *drv, const char *name)
878 struct net_device *ndev;
879 struct sir_dev *dev;
881 IRDA_DEBUG(0, "%s - %s\n", __FUNCTION__, name);
883 /* instead of adding tests to protect against drv->do_write==NULL
884 * at several places we refuse to create a sir_dev instance for
885 * drivers which don't implement do_write.
887 if (!drv || !drv->do_write)
888 return NULL;
891 * Allocate new instance of the device
893 ndev = alloc_irdadev(sizeof(*dev));
894 if (ndev == NULL) {
895 IRDA_ERROR("%s - Can't allocate memory for IrDA control block!\n", __FUNCTION__);
896 goto out;
898 dev = ndev->priv;
900 irda_init_max_qos_capabilies(&dev->qos);
901 dev->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
902 dev->qos.min_turn_time.bits = drv->qos_mtt_bits;
903 irda_qos_bits_to_value(&dev->qos);
905 strncpy(dev->hwname, name, sizeof(dev->hwname)-1);
907 atomic_set(&dev->enable_rx, 0);
908 dev->tx_skb = NULL;
910 spin_lock_init(&dev->tx_lock);
911 init_MUTEX(&dev->fsm.sem);
913 dev->drv = drv;
914 dev->netdev = ndev;
916 SET_MODULE_OWNER(ndev);
918 /* Override the network functions we need to use */
919 ndev->hard_start_xmit = sirdev_hard_xmit;
920 ndev->open = sirdev_open;
921 ndev->stop = sirdev_close;
922 ndev->get_stats = sirdev_get_stats;
923 ndev->do_ioctl = sirdev_ioctl;
925 if (register_netdev(ndev)) {
926 IRDA_ERROR("%s(), register_netdev() failed!\n", __FUNCTION__);
927 goto out_freenetdev;
930 return dev;
932 out_freenetdev:
933 free_netdev(ndev);
934 out:
935 return NULL;
937 EXPORT_SYMBOL(sirdev_get_instance);
939 int sirdev_put_instance(struct sir_dev *dev)
941 int err = 0;
943 IRDA_DEBUG(0, "%s\n", __FUNCTION__);
945 atomic_set(&dev->enable_rx, 0);
947 netif_carrier_off(dev->netdev);
948 netif_device_detach(dev->netdev);
950 if (dev->dongle_drv)
951 err = sirdev_schedule_dongle_close(dev);
952 if (err)
953 IRDA_ERROR("%s - error %d\n", __FUNCTION__, err);
955 sirdev_close(dev->netdev);
957 down(&dev->fsm.sem);
958 dev->fsm.state = SIRDEV_STATE_DEAD; /* mark staled */
959 dev->dongle_drv = NULL;
960 dev->priv = NULL;
961 up(&dev->fsm.sem);
963 /* Remove netdevice */
964 unregister_netdev(dev->netdev);
966 free_netdev(dev->netdev);
968 return 0;
970 EXPORT_SYMBOL(sirdev_put_instance);
972 static int __init sir_wq_init(void)
974 irda_sir_wq = create_singlethread_workqueue("irda_sir_wq");
975 if (!irda_sir_wq)
976 return -ENOMEM;
977 return 0;
980 static void __exit sir_wq_exit(void)
982 destroy_workqueue(irda_sir_wq);
985 module_init(sir_wq_init);
986 module_exit(sir_wq_exit);
988 MODULE_AUTHOR("Martin Diehl <info@mdiehl.de>");
989 MODULE_DESCRIPTION("IrDA SIR core");
990 MODULE_LICENSE("GPL");