ifb: add performance flags
[linux-2.6.git] / drivers / net / irda / sir_dev.c
1 /*********************************************************************
2  *
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.
11  *
12  ********************************************************************/    
13
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/init.h>
18 #include <linux/delay.h>
19
20 #include <net/irda/irda.h>
21 #include <net/irda/wrapper.h>
22 #include <net/irda/irda_device.h>
23
24 #include "sir-dev.h"
25
26
27 static struct workqueue_struct *irda_sir_wq;
28
29 /* STATE MACHINE */
30
31 /* substate handler of the config-fsm to handle the cases where we want
32  * to wait for transmit completion before changing the port configuration
33  */
34
35 static int sirdev_tx_complete_fsm(struct sir_dev *dev)
36 {
37         struct sir_fsm *fsm = &dev->fsm;
38         unsigned next_state, delay;
39         unsigned bytes_left;
40
41         do {
42                 next_state = fsm->substate;     /* default: stay in current substate */
43                 delay = 0;
44
45                 switch(fsm->substate) {
46
47                 case SIRDEV_STATE_WAIT_XMIT:
48                         if (dev->drv->chars_in_buffer)
49                                 bytes_left = dev->drv->chars_in_buffer(dev);
50                         else
51                                 bytes_left = 0;
52                         if (!bytes_left) {
53                                 next_state = SIRDEV_STATE_WAIT_UNTIL_SENT;
54                                 break;
55                         }
56
57                         if (dev->speed > 115200)
58                                 delay = (bytes_left*8*10000) / (dev->speed/100);
59                         else if (dev->speed > 0)
60                                 delay = (bytes_left*10*10000) / (dev->speed/100);
61                         else
62                                 delay = 0;
63                         /* expected delay (usec) until remaining bytes are sent */
64                         if (delay < 100) {
65                                 udelay(delay);
66                                 delay = 0;
67                                 break;
68                         }
69                         /* sleep some longer delay (msec) */
70                         delay = (delay+999) / 1000;
71                         break;
72
73                 case SIRDEV_STATE_WAIT_UNTIL_SENT:
74                         /* block until underlaying hardware buffer are empty */
75                         if (dev->drv->wait_until_sent)
76                                 dev->drv->wait_until_sent(dev);
77                         next_state = SIRDEV_STATE_TX_DONE;
78                         break;
79
80                 case SIRDEV_STATE_TX_DONE:
81                         return 0;
82
83                 default:
84                         IRDA_ERROR("%s - undefined state\n", __func__);
85                         return -EINVAL;
86                 }
87                 fsm->substate = next_state;
88         } while (delay == 0);
89         return delay;
90 }
91
92 /*
93  * Function sirdev_config_fsm
94  *
95  * State machine to handle the configuration of the device (and attached dongle, if any).
96  * This handler is scheduled for execution in kIrDAd context, so we can sleep.
97  * however, kIrDAd is shared by all sir_dev devices so we better don't sleep there too
98  * long. Instead, for longer delays we start a timer to reschedule us later.
99  * On entry, fsm->sem is always locked and the netdev xmit queue stopped.
100  * Both must be unlocked/restarted on completion - but only on final exit.
101  */
102
103 static void sirdev_config_fsm(struct work_struct *work)
104 {
105         struct sir_dev *dev = container_of(work, struct sir_dev, fsm.work.work);
106         struct sir_fsm *fsm = &dev->fsm;
107         int next_state;
108         int ret = -1;
109         unsigned delay;
110
111         IRDA_DEBUG(2, "%s(), <%ld>\n", __func__, jiffies);
112
113         do {
114                 IRDA_DEBUG(3, "%s - state=0x%04x / substate=0x%04x\n",
115                         __func__, fsm->state, fsm->substate);
116
117                 next_state = fsm->state;
118                 delay = 0;
119
120                 switch(fsm->state) {
121
122                 case SIRDEV_STATE_DONGLE_OPEN:
123                         if (dev->dongle_drv != NULL) {
124                                 ret = sirdev_put_dongle(dev);
125                                 if (ret) {
126                                         fsm->result = -EINVAL;
127                                         next_state = SIRDEV_STATE_ERROR;
128                                         break;
129                                 }
130                         }
131
132                         /* Initialize dongle */
133                         ret = sirdev_get_dongle(dev, fsm->param);
134                         if (ret) {
135                                 fsm->result = ret;
136                                 next_state = SIRDEV_STATE_ERROR;
137                                 break;
138                         }
139
140                         /* Dongles are powered through the modem control lines which
141                          * were just set during open. Before resetting, let's wait for
142                          * the power to stabilize. This is what some dongle drivers did
143                          * in open before, while others didn't - should be safe anyway.
144                          */
145
146                         delay = 50;
147                         fsm->substate = SIRDEV_STATE_DONGLE_RESET;
148                         next_state = SIRDEV_STATE_DONGLE_RESET;
149
150                         fsm->param = 9600;
151
152                         break;
153
154                 case SIRDEV_STATE_DONGLE_CLOSE:
155                         /* shouldn't we just treat this as success=? */
156                         if (dev->dongle_drv == NULL) {
157                                 fsm->result = -EINVAL;
158                                 next_state = SIRDEV_STATE_ERROR;
159                                 break;
160                         }
161
162                         ret = sirdev_put_dongle(dev);
163                         if (ret) {
164                                 fsm->result = ret;
165                                 next_state = SIRDEV_STATE_ERROR;
166                                 break;
167                         }
168                         next_state = SIRDEV_STATE_DONE;
169                         break;
170
171                 case SIRDEV_STATE_SET_DTR_RTS:
172                         ret = sirdev_set_dtr_rts(dev,
173                                 (fsm->param&0x02) ? TRUE : FALSE,
174                                 (fsm->param&0x01) ? TRUE : FALSE);
175                         next_state = SIRDEV_STATE_DONE;
176                         break;
177
178                 case SIRDEV_STATE_SET_SPEED:
179                         fsm->substate = SIRDEV_STATE_WAIT_XMIT;
180                         next_state = SIRDEV_STATE_DONGLE_CHECK;
181                         break;
182
183                 case SIRDEV_STATE_DONGLE_CHECK:
184                         ret = sirdev_tx_complete_fsm(dev);
185                         if (ret < 0) {
186                                 fsm->result = ret;
187                                 next_state = SIRDEV_STATE_ERROR;
188                                 break;
189                         }
190                         if ((delay=ret) != 0)
191                                 break;
192
193                         if (dev->dongle_drv) {
194                                 fsm->substate = SIRDEV_STATE_DONGLE_RESET;
195                                 next_state = SIRDEV_STATE_DONGLE_RESET;
196                         }
197                         else {
198                                 dev->speed = fsm->param;
199                                 next_state = SIRDEV_STATE_PORT_SPEED;
200                         }
201                         break;
202
203                 case SIRDEV_STATE_DONGLE_RESET:
204                         if (dev->dongle_drv->reset) {
205                                 ret = dev->dongle_drv->reset(dev);
206                                 if (ret < 0) {
207                                         fsm->result = ret;
208                                         next_state = SIRDEV_STATE_ERROR;
209                                         break;
210                                 }
211                         }
212                         else
213                                 ret = 0;
214                         if ((delay=ret) == 0) {
215                                 /* set serial port according to dongle default speed */
216                                 if (dev->drv->set_speed)
217                                         dev->drv->set_speed(dev, dev->speed);
218                                 fsm->substate = SIRDEV_STATE_DONGLE_SPEED;
219                                 next_state = SIRDEV_STATE_DONGLE_SPEED;
220                         }
221                         break;
222
223                 case SIRDEV_STATE_DONGLE_SPEED:
224                         if (dev->dongle_drv->reset) {
225                                 ret = dev->dongle_drv->set_speed(dev, fsm->param);
226                                 if (ret < 0) {
227                                         fsm->result = ret;
228                                         next_state = SIRDEV_STATE_ERROR;
229                                         break;
230                                 }
231                         }
232                         else
233                                 ret = 0;
234                         if ((delay=ret) == 0)
235                                 next_state = SIRDEV_STATE_PORT_SPEED;
236                         break;
237
238                 case SIRDEV_STATE_PORT_SPEED:
239                         /* Finally we are ready to change the serial port speed */
240                         if (dev->drv->set_speed)
241                                 dev->drv->set_speed(dev, dev->speed);
242                         dev->new_speed = 0;
243                         next_state = SIRDEV_STATE_DONE;
244                         break;
245
246                 case SIRDEV_STATE_DONE:
247                         /* Signal network layer so it can send more frames */
248                         netif_wake_queue(dev->netdev);
249                         next_state = SIRDEV_STATE_COMPLETE;
250                         break;
251
252                 default:
253                         IRDA_ERROR("%s - undefined state\n", __func__);
254                         fsm->result = -EINVAL;
255                         /* fall thru */
256
257                 case SIRDEV_STATE_ERROR:
258                         IRDA_ERROR("%s - error: %d\n", __func__, fsm->result);
259
260 #if 0   /* don't enable this before we have netdev->tx_timeout to recover */
261                         netif_stop_queue(dev->netdev);
262 #else
263                         netif_wake_queue(dev->netdev);
264 #endif
265                         /* fall thru */
266
267                 case SIRDEV_STATE_COMPLETE:
268                         /* config change finished, so we are not busy any longer */
269                         sirdev_enable_rx(dev);
270                         up(&fsm->sem);
271                         return;
272                 }
273                 fsm->state = next_state;
274         } while(!delay);
275
276         queue_delayed_work(irda_sir_wq, &fsm->work, msecs_to_jiffies(delay));
277 }
278
279 /* schedule some device configuration task for execution by kIrDAd
280  * on behalf of the above state machine.
281  * can be called from process or interrupt/tasklet context.
282  */
283
284 int sirdev_schedule_request(struct sir_dev *dev, int initial_state, unsigned param)
285 {
286         struct sir_fsm *fsm = &dev->fsm;
287
288         IRDA_DEBUG(2, "%s - state=0x%04x / param=%u\n", __func__,
289                         initial_state, param);
290
291         if (down_trylock(&fsm->sem)) {
292                 if (in_interrupt()  ||  in_atomic()  ||  irqs_disabled()) {
293                         IRDA_DEBUG(1, "%s(), state machine busy!\n", __func__);
294                         return -EWOULDBLOCK;
295                 } else
296                         down(&fsm->sem);
297         }
298
299         if (fsm->state == SIRDEV_STATE_DEAD) {
300                 /* race with sirdev_close should never happen */
301                 IRDA_ERROR("%s(), instance staled!\n", __func__);
302                 up(&fsm->sem);
303                 return -ESTALE;         /* or better EPIPE? */
304         }
305
306         netif_stop_queue(dev->netdev);
307         atomic_set(&dev->enable_rx, 0);
308
309         fsm->state = initial_state;
310         fsm->param = param;
311         fsm->result = 0;
312
313         INIT_DELAYED_WORK(&fsm->work, sirdev_config_fsm);
314         queue_delayed_work(irda_sir_wq, &fsm->work, 0);
315         return 0;
316 }
317
318
319 /***************************************************************************/
320
321 void sirdev_enable_rx(struct sir_dev *dev)
322 {
323         if (unlikely(atomic_read(&dev->enable_rx)))
324                 return;
325
326         /* flush rx-buffer - should also help in case of problems with echo cancelation */
327         dev->rx_buff.data = dev->rx_buff.head;
328         dev->rx_buff.len = 0;
329         dev->rx_buff.in_frame = FALSE;
330         dev->rx_buff.state = OUTSIDE_FRAME;
331         atomic_set(&dev->enable_rx, 1);
332 }
333
334 static int sirdev_is_receiving(struct sir_dev *dev)
335 {
336         if (!atomic_read(&dev->enable_rx))
337                 return 0;
338
339         return dev->rx_buff.state != OUTSIDE_FRAME;
340 }
341
342 int sirdev_set_dongle(struct sir_dev *dev, IRDA_DONGLE type)
343 {
344         int err;
345
346         IRDA_DEBUG(3, "%s : requesting dongle %d.\n", __func__, type);
347
348         err = sirdev_schedule_dongle_open(dev, type);
349         if (unlikely(err))
350                 return err;
351         down(&dev->fsm.sem);            /* block until config change completed */
352         err = dev->fsm.result;
353         up(&dev->fsm.sem);
354         return err;
355 }
356 EXPORT_SYMBOL(sirdev_set_dongle);
357
358 /* used by dongle drivers for dongle programming */
359
360 int sirdev_raw_write(struct sir_dev *dev, const char *buf, int len)
361 {
362         unsigned long flags;
363         int ret;
364
365         if (unlikely(len > dev->tx_buff.truesize))
366                 return -ENOSPC;
367
368         spin_lock_irqsave(&dev->tx_lock, flags);        /* serialize with other tx operations */
369         while (dev->tx_buff.len > 0) {                  /* wait until tx idle */
370                 spin_unlock_irqrestore(&dev->tx_lock, flags);
371                 msleep(10);
372                 spin_lock_irqsave(&dev->tx_lock, flags);
373         }
374
375         dev->tx_buff.data = dev->tx_buff.head;
376         memcpy(dev->tx_buff.data, buf, len);    
377         dev->tx_buff.len = len;
378
379         ret = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
380         if (ret > 0) {
381                 IRDA_DEBUG(3, "%s(), raw-tx started\n", __func__);
382
383                 dev->tx_buff.data += ret;
384                 dev->tx_buff.len -= ret;
385                 dev->raw_tx = 1;
386                 ret = len;              /* all data is going to be sent */
387         }
388         spin_unlock_irqrestore(&dev->tx_lock, flags);
389         return ret;
390 }
391 EXPORT_SYMBOL(sirdev_raw_write);
392
393 /* seems some dongle drivers may need this */
394
395 int sirdev_raw_read(struct sir_dev *dev, char *buf, int len)
396 {
397         int count;
398
399         if (atomic_read(&dev->enable_rx))
400                 return -EIO;            /* fail if we expect irda-frames */
401
402         count = (len < dev->rx_buff.len) ? len : dev->rx_buff.len;
403
404         if (count > 0) {
405                 memcpy(buf, dev->rx_buff.data, count);
406                 dev->rx_buff.data += count;
407                 dev->rx_buff.len -= count;
408         }
409
410         /* remaining stuff gets flushed when re-enabling normal rx */
411
412         return count;
413 }
414 EXPORT_SYMBOL(sirdev_raw_read);
415
416 int sirdev_set_dtr_rts(struct sir_dev *dev, int dtr, int rts)
417 {
418         int ret = -ENXIO;
419         if (dev->drv->set_dtr_rts)
420                 ret =  dev->drv->set_dtr_rts(dev, dtr, rts);
421         return ret;
422 }
423 EXPORT_SYMBOL(sirdev_set_dtr_rts);
424
425 /**********************************************************************/
426
427 /* called from client driver - likely with bh-context - to indicate
428  * it made some progress with transmission. Hence we send the next
429  * chunk, if any, or complete the skb otherwise
430  */
431
432 void sirdev_write_complete(struct sir_dev *dev)
433 {
434         unsigned long flags;
435         struct sk_buff *skb;
436         int actual = 0;
437         int err;
438         
439         spin_lock_irqsave(&dev->tx_lock, flags);
440
441         IRDA_DEBUG(3, "%s() - dev->tx_buff.len = %d\n",
442                    __func__, dev->tx_buff.len);
443
444         if (likely(dev->tx_buff.len > 0))  {
445                 /* Write data left in transmit buffer */
446                 actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
447
448                 if (likely(actual>0)) {
449                         dev->tx_buff.data += actual;
450                         dev->tx_buff.len  -= actual;
451                 }
452                 else if (unlikely(actual<0)) {
453                         /* could be dropped later when we have tx_timeout to recover */
454                         IRDA_ERROR("%s: drv->do_write failed (%d)\n",
455                                    __func__, actual);
456                         if ((skb=dev->tx_skb) != NULL) {
457                                 dev->tx_skb = NULL;
458                                 dev_kfree_skb_any(skb);
459                                 dev->netdev->stats.tx_errors++;
460                                 dev->netdev->stats.tx_dropped++;
461                         }
462                         dev->tx_buff.len = 0;
463                 }
464                 if (dev->tx_buff.len > 0)
465                         goto done;      /* more data to send later */
466         }
467
468         if (unlikely(dev->raw_tx != 0)) {
469                 /* in raw mode we are just done now after the buffer was sent
470                  * completely. Since this was requested by some dongle driver
471                  * running under the control of the irda-thread we must take
472                  * care here not to re-enable the queue. The queue will be
473                  * restarted when the irda-thread has completed the request.
474                  */
475
476                 IRDA_DEBUG(3, "%s(), raw-tx done\n", __func__);
477                 dev->raw_tx = 0;
478                 goto done;      /* no post-frame handling in raw mode */
479         }
480
481         /* we have finished now sending this skb.
482          * update statistics and free the skb.
483          * finally we check and trigger a pending speed change, if any.
484          * if not we switch to rx mode and wake the queue for further
485          * packets.
486          * note the scheduled speed request blocks until the lower
487          * client driver and the corresponding hardware has really
488          * finished sending all data (xmit fifo drained f.e.)
489          * before the speed change gets finally done and the queue
490          * re-activated.
491          */
492
493         IRDA_DEBUG(5, "%s(), finished with frame!\n", __func__);
494                 
495         if ((skb=dev->tx_skb) != NULL) {
496                 dev->tx_skb = NULL;
497                 dev->netdev->stats.tx_packets++;
498                 dev->netdev->stats.tx_bytes += skb->len;
499                 dev_kfree_skb_any(skb);
500         }
501
502         if (unlikely(dev->new_speed > 0)) {
503                 IRDA_DEBUG(5, "%s(), Changing speed!\n", __func__);
504                 err = sirdev_schedule_speed(dev, dev->new_speed);
505                 if (unlikely(err)) {
506                         /* should never happen
507                          * forget the speed change and hope the stack recovers
508                          */
509                         IRDA_ERROR("%s - schedule speed change failed: %d\n",
510                                    __func__, err);
511                         netif_wake_queue(dev->netdev);
512                 }
513                 /* else: success
514                  *      speed change in progress now
515                  *      on completion dev->new_speed gets cleared,
516                  *      rx-reenabled and the queue restarted
517                  */
518         }
519         else {
520                 sirdev_enable_rx(dev);
521                 netif_wake_queue(dev->netdev);
522         }
523
524 done:
525         spin_unlock_irqrestore(&dev->tx_lock, flags);
526 }
527 EXPORT_SYMBOL(sirdev_write_complete);
528
529 /* called from client driver - likely with bh-context - to give us
530  * some more received bytes. We put them into the rx-buffer,
531  * normally unwrapping and building LAP-skb's (unless rx disabled)
532  */
533
534 int sirdev_receive(struct sir_dev *dev, const unsigned char *cp, size_t count) 
535 {
536         if (!dev || !dev->netdev) {
537                 IRDA_WARNING("%s(), not ready yet!\n", __func__);
538                 return -1;
539         }
540
541         if (!dev->irlap) {
542                 IRDA_WARNING("%s - too early: %p / %zd!\n",
543                              __func__, cp, count);
544                 return -1;
545         }
546
547         if (cp==NULL) {
548                 /* error already at lower level receive
549                  * just update stats and set media busy
550                  */
551                 irda_device_set_media_busy(dev->netdev, TRUE);
552                 dev->netdev->stats.rx_dropped++;
553                 IRDA_DEBUG(0, "%s; rx-drop: %zd\n", __func__, count);
554                 return 0;
555         }
556
557         /* Read the characters into the buffer */
558         if (likely(atomic_read(&dev->enable_rx))) {
559                 while (count--)
560                         /* Unwrap and destuff one byte */
561                         async_unwrap_char(dev->netdev, &dev->netdev->stats,
562                                           &dev->rx_buff, *cp++);
563         } else {
564                 while (count--) {
565                         /* rx not enabled: save the raw bytes and never
566                          * trigger any netif_rx. The received bytes are flushed
567                          * later when we re-enable rx but might be read meanwhile
568                          * by the dongle driver.
569                          */
570                         dev->rx_buff.data[dev->rx_buff.len++] = *cp++;
571
572                         /* What should we do when the buffer is full? */
573                         if (unlikely(dev->rx_buff.len == dev->rx_buff.truesize))
574                                 dev->rx_buff.len = 0;
575                 }
576         }
577
578         return 0;
579 }
580 EXPORT_SYMBOL(sirdev_receive);
581
582 /**********************************************************************/
583
584 /* callbacks from network layer */
585
586 static netdev_tx_t sirdev_hard_xmit(struct sk_buff *skb,
587                                           struct net_device *ndev)
588 {
589         struct sir_dev *dev = netdev_priv(ndev);
590         unsigned long flags;
591         int actual = 0;
592         int err;
593         s32 speed;
594
595         IRDA_ASSERT(dev != NULL, return NETDEV_TX_OK;);
596
597         netif_stop_queue(ndev);
598
599         IRDA_DEBUG(3, "%s(), skb->len = %d\n", __func__, skb->len);
600
601         speed = irda_get_next_speed(skb);
602         if ((speed != dev->speed) && (speed != -1)) {
603                 if (!skb->len) {
604                         err = sirdev_schedule_speed(dev, speed);
605                         if (unlikely(err == -EWOULDBLOCK)) {
606                                 /* Failed to initiate the speed change, likely the fsm
607                                  * is still busy (pretty unlikely, but...)
608                                  * We refuse to accept the skb and return with the queue
609                                  * stopped so the network layer will retry after the
610                                  * fsm completes and wakes the queue.
611                                  */
612                                  return NETDEV_TX_BUSY;
613                         }
614                         else if (unlikely(err)) {
615                                 /* other fatal error - forget the speed change and
616                                  * hope the stack will recover somehow
617                                  */
618                                  netif_start_queue(ndev);
619                         }
620                         /* else: success
621                          *      speed change in progress now
622                          *      on completion the queue gets restarted
623                          */
624
625                         dev_kfree_skb_any(skb);
626                         return NETDEV_TX_OK;
627                 } else
628                         dev->new_speed = speed;
629         }
630
631         /* Init tx buffer*/
632         dev->tx_buff.data = dev->tx_buff.head;
633
634         /* Check problems */
635         if(spin_is_locked(&dev->tx_lock)) {
636                 IRDA_DEBUG(3, "%s(), write not completed\n", __func__);
637         }
638
639         /* serialize with write completion */
640         spin_lock_irqsave(&dev->tx_lock, flags);
641
642         /* Copy skb to tx_buff while wrapping, stuffing and making CRC */
643         dev->tx_buff.len = async_wrap_skb(skb, dev->tx_buff.data, dev->tx_buff.truesize); 
644
645         /* transmission will start now - disable receive.
646          * if we are just in the middle of an incoming frame,
647          * treat it as collision. probably it's a good idea to
648          * reset the rx_buf OUTSIDE_FRAME in this case too?
649          */
650         atomic_set(&dev->enable_rx, 0);
651         if (unlikely(sirdev_is_receiving(dev)))
652                 dev->netdev->stats.collisions++;
653
654         actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
655
656         if (likely(actual > 0)) {
657                 dev->tx_skb = skb;
658                 dev->tx_buff.data += actual;
659                 dev->tx_buff.len -= actual;
660         }
661         else if (unlikely(actual < 0)) {
662                 /* could be dropped later when we have tx_timeout to recover */
663                 IRDA_ERROR("%s: drv->do_write failed (%d)\n",
664                            __func__, actual);
665                 dev_kfree_skb_any(skb);
666                 dev->netdev->stats.tx_errors++;
667                 dev->netdev->stats.tx_dropped++;
668                 netif_wake_queue(ndev);
669         }
670         spin_unlock_irqrestore(&dev->tx_lock, flags);
671
672         return NETDEV_TX_OK;
673 }
674
675 /* called from network layer with rtnl hold */
676
677 static int sirdev_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
678 {
679         struct if_irda_req *irq = (struct if_irda_req *) rq;
680         struct sir_dev *dev = netdev_priv(ndev);
681         int ret = 0;
682
683         IRDA_ASSERT(dev != NULL, return -1;);
684
685         IRDA_DEBUG(3, "%s(), %s, (cmd=0x%X)\n", __func__, ndev->name, cmd);
686         
687         switch (cmd) {
688         case SIOCSBANDWIDTH: /* Set bandwidth */
689                 if (!capable(CAP_NET_ADMIN))
690                         ret = -EPERM;
691                 else
692                         ret = sirdev_schedule_speed(dev, irq->ifr_baudrate);
693                 /* cannot sleep here for completion
694                  * we are called from network layer with rtnl hold
695                  */
696                 break;
697
698         case SIOCSDONGLE: /* Set dongle */
699                 if (!capable(CAP_NET_ADMIN))
700                         ret = -EPERM;
701                 else
702                         ret = sirdev_schedule_dongle_open(dev, irq->ifr_dongle);
703                 /* cannot sleep here for completion
704                  * we are called from network layer with rtnl hold
705                  */
706                 break;
707
708         case SIOCSMEDIABUSY: /* Set media busy */
709                 if (!capable(CAP_NET_ADMIN))
710                         ret = -EPERM;
711                 else
712                         irda_device_set_media_busy(dev->netdev, TRUE);
713                 break;
714
715         case SIOCGRECEIVING: /* Check if we are receiving right now */
716                 irq->ifr_receiving = sirdev_is_receiving(dev);
717                 break;
718
719         case SIOCSDTRRTS:
720                 if (!capable(CAP_NET_ADMIN))
721                         ret = -EPERM;
722                 else
723                         ret = sirdev_schedule_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts);
724                 /* cannot sleep here for completion
725                  * we are called from network layer with rtnl hold
726                  */
727                 break;
728
729         case SIOCSMODE:
730 #if 0
731                 if (!capable(CAP_NET_ADMIN))
732                         ret = -EPERM;
733                 else
734                         ret = sirdev_schedule_mode(dev, irq->ifr_mode);
735                 /* cannot sleep here for completion
736                  * we are called from network layer with rtnl hold
737                  */
738                 break;
739 #endif
740         default:
741                 ret = -EOPNOTSUPP;
742         }
743         
744         return ret;
745 }
746
747 /* ----------------------------------------------------------------------------- */
748
749 #define SIRBUF_ALLOCSIZE 4269   /* worst case size of a wrapped IrLAP frame */
750
751 static int sirdev_alloc_buffers(struct sir_dev *dev)
752 {
753         dev->tx_buff.truesize = SIRBUF_ALLOCSIZE;
754         dev->rx_buff.truesize = IRDA_SKB_MAX_MTU; 
755
756         /* Bootstrap ZeroCopy Rx */
757         dev->rx_buff.skb = __netdev_alloc_skb(dev->netdev, dev->rx_buff.truesize,
758                                               GFP_KERNEL);
759         if (dev->rx_buff.skb == NULL)
760                 return -ENOMEM;
761         skb_reserve(dev->rx_buff.skb, 1);
762         dev->rx_buff.head = dev->rx_buff.skb->data;
763
764         dev->tx_buff.head = kmalloc(dev->tx_buff.truesize, GFP_KERNEL);
765         if (dev->tx_buff.head == NULL) {
766                 kfree_skb(dev->rx_buff.skb);
767                 dev->rx_buff.skb = NULL;
768                 dev->rx_buff.head = NULL;
769                 return -ENOMEM;
770         }
771
772         dev->tx_buff.data = dev->tx_buff.head;
773         dev->rx_buff.data = dev->rx_buff.head;
774         dev->tx_buff.len = 0;
775         dev->rx_buff.len = 0;
776
777         dev->rx_buff.in_frame = FALSE;
778         dev->rx_buff.state = OUTSIDE_FRAME;
779         return 0;
780 };
781
782 static void sirdev_free_buffers(struct sir_dev *dev)
783 {
784         kfree_skb(dev->rx_buff.skb);
785         kfree(dev->tx_buff.head);
786         dev->rx_buff.head = dev->tx_buff.head = NULL;
787         dev->rx_buff.skb = NULL;
788 }
789
790 static int sirdev_open(struct net_device *ndev)
791 {
792         struct sir_dev *dev = netdev_priv(ndev);
793         const struct sir_driver *drv = dev->drv;
794
795         if (!drv)
796                 return -ENODEV;
797
798         /* increase the reference count of the driver module before doing serious stuff */
799         if (!try_module_get(drv->owner))
800                 return -ESTALE;
801
802         IRDA_DEBUG(2, "%s()\n", __func__);
803
804         if (sirdev_alloc_buffers(dev))
805                 goto errout_dec;
806
807         if (!dev->drv->start_dev  ||  dev->drv->start_dev(dev))
808                 goto errout_free;
809
810         sirdev_enable_rx(dev);
811         dev->raw_tx = 0;
812
813         netif_start_queue(ndev);
814         dev->irlap = irlap_open(ndev, &dev->qos, dev->hwname);
815         if (!dev->irlap)
816                 goto errout_stop;
817
818         netif_wake_queue(ndev);
819
820         IRDA_DEBUG(2, "%s - done, speed = %d\n", __func__, dev->speed);
821
822         return 0;
823
824 errout_stop:
825         atomic_set(&dev->enable_rx, 0);
826         if (dev->drv->stop_dev)
827                 dev->drv->stop_dev(dev);
828 errout_free:
829         sirdev_free_buffers(dev);
830 errout_dec:
831         module_put(drv->owner);
832         return -EAGAIN;
833 }
834
835 static int sirdev_close(struct net_device *ndev)
836 {
837         struct sir_dev *dev = netdev_priv(ndev);
838         const struct sir_driver *drv;
839
840 //      IRDA_DEBUG(0, "%s\n", __func__);
841
842         netif_stop_queue(ndev);
843
844         down(&dev->fsm.sem);            /* block on pending config completion */
845
846         atomic_set(&dev->enable_rx, 0);
847
848         if (unlikely(!dev->irlap))
849                 goto out;
850         irlap_close(dev->irlap);
851         dev->irlap = NULL;
852
853         drv = dev->drv;
854         if (unlikely(!drv  ||  !dev->priv))
855                 goto out;
856
857         if (drv->stop_dev)
858                 drv->stop_dev(dev);
859
860         sirdev_free_buffers(dev);
861         module_put(drv->owner);
862
863 out:
864         dev->speed = 0;
865         up(&dev->fsm.sem);
866         return 0;
867 }
868
869 static const struct net_device_ops sirdev_ops = {
870         .ndo_start_xmit = sirdev_hard_xmit,
871         .ndo_open       = sirdev_open,
872         .ndo_stop       = sirdev_close,
873         .ndo_do_ioctl   = sirdev_ioctl,
874 };
875 /* ----------------------------------------------------------------------------- */
876
877 struct sir_dev * sirdev_get_instance(const struct sir_driver *drv, const char *name)
878 {
879         struct net_device *ndev;
880         struct sir_dev *dev;
881
882         IRDA_DEBUG(0, "%s - %s\n", __func__, name);
883
884         /* instead of adding tests to protect against drv->do_write==NULL
885          * at several places we refuse to create a sir_dev instance for
886          * drivers which don't implement do_write.
887          */
888         if (!drv ||  !drv->do_write)
889                 return NULL;
890
891         /*
892          *  Allocate new instance of the device
893          */
894         ndev = alloc_irdadev(sizeof(*dev));
895         if (ndev == NULL) {
896                 IRDA_ERROR("%s - Can't allocate memory for IrDA control block!\n", __func__);
897                 goto out;
898         }
899         dev = netdev_priv(ndev);
900
901         irda_init_max_qos_capabilies(&dev->qos);
902         dev->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
903         dev->qos.min_turn_time.bits = drv->qos_mtt_bits;
904         irda_qos_bits_to_value(&dev->qos);
905
906         strncpy(dev->hwname, name, sizeof(dev->hwname)-1);
907
908         atomic_set(&dev->enable_rx, 0);
909         dev->tx_skb = NULL;
910
911         spin_lock_init(&dev->tx_lock);
912         sema_init(&dev->fsm.sem, 1);
913
914         dev->drv = drv;
915         dev->netdev = ndev;
916
917         /* Override the network functions we need to use */
918         ndev->netdev_ops = &sirdev_ops;
919
920         if (register_netdev(ndev)) {
921                 IRDA_ERROR("%s(), register_netdev() failed!\n", __func__);
922                 goto out_freenetdev;
923         }
924
925         return dev;
926
927 out_freenetdev:
928         free_netdev(ndev);
929 out:
930         return NULL;
931 }
932 EXPORT_SYMBOL(sirdev_get_instance);
933
934 int sirdev_put_instance(struct sir_dev *dev)
935 {
936         int err = 0;
937
938         IRDA_DEBUG(0, "%s\n", __func__);
939
940         atomic_set(&dev->enable_rx, 0);
941
942         netif_carrier_off(dev->netdev);
943         netif_device_detach(dev->netdev);
944
945         if (dev->dongle_drv)
946                 err = sirdev_schedule_dongle_close(dev);
947         if (err)
948                 IRDA_ERROR("%s - error %d\n", __func__, err);
949
950         sirdev_close(dev->netdev);
951
952         down(&dev->fsm.sem);
953         dev->fsm.state = SIRDEV_STATE_DEAD;     /* mark staled */
954         dev->dongle_drv = NULL;
955         dev->priv = NULL;
956         up(&dev->fsm.sem);
957
958         /* Remove netdevice */
959         unregister_netdev(dev->netdev);
960
961         free_netdev(dev->netdev);
962
963         return 0;
964 }
965 EXPORT_SYMBOL(sirdev_put_instance);
966
967 static int __init sir_wq_init(void)
968 {
969         irda_sir_wq = create_singlethread_workqueue("irda_sir_wq");
970         if (!irda_sir_wq)
971                 return -ENOMEM;
972         return 0;
973 }
974
975 static void __exit sir_wq_exit(void)
976 {
977         destroy_workqueue(irda_sir_wq);
978 }
979
980 module_init(sir_wq_init);
981 module_exit(sir_wq_exit);
982
983 MODULE_AUTHOR("Martin Diehl <info@mdiehl.de>");
984 MODULE_DESCRIPTION("IrDA SIR core");
985 MODULE_LICENSE("GPL");