net: remove interrupt.h inclusion from netdevice.h
[linux-3.10.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/hardirq.h>
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/init.h>
19 #include <linux/delay.h>
20
21 #include <net/irda/irda.h>
22 #include <net/irda/wrapper.h>
23 #include <net/irda/irda_device.h>
24
25 #include "sir-dev.h"
26
27
28 static struct workqueue_struct *irda_sir_wq;
29
30 /* STATE MACHINE */
31
32 /* substate handler of the config-fsm to handle the cases where we want
33  * to wait for transmit completion before changing the port configuration
34  */
35
36 static int sirdev_tx_complete_fsm(struct sir_dev *dev)
37 {
38         struct sir_fsm *fsm = &dev->fsm;
39         unsigned next_state, delay;
40         unsigned bytes_left;
41
42         do {
43                 next_state = fsm->substate;     /* default: stay in current substate */
44                 delay = 0;
45
46                 switch(fsm->substate) {
47
48                 case SIRDEV_STATE_WAIT_XMIT:
49                         if (dev->drv->chars_in_buffer)
50                                 bytes_left = dev->drv->chars_in_buffer(dev);
51                         else
52                                 bytes_left = 0;
53                         if (!bytes_left) {
54                                 next_state = SIRDEV_STATE_WAIT_UNTIL_SENT;
55                                 break;
56                         }
57
58                         if (dev->speed > 115200)
59                                 delay = (bytes_left*8*10000) / (dev->speed/100);
60                         else if (dev->speed > 0)
61                                 delay = (bytes_left*10*10000) / (dev->speed/100);
62                         else
63                                 delay = 0;
64                         /* expected delay (usec) until remaining bytes are sent */
65                         if (delay < 100) {
66                                 udelay(delay);
67                                 delay = 0;
68                                 break;
69                         }
70                         /* sleep some longer delay (msec) */
71                         delay = (delay+999) / 1000;
72                         break;
73
74                 case SIRDEV_STATE_WAIT_UNTIL_SENT:
75                         /* block until underlaying hardware buffer are empty */
76                         if (dev->drv->wait_until_sent)
77                                 dev->drv->wait_until_sent(dev);
78                         next_state = SIRDEV_STATE_TX_DONE;
79                         break;
80
81                 case SIRDEV_STATE_TX_DONE:
82                         return 0;
83
84                 default:
85                         IRDA_ERROR("%s - undefined state\n", __func__);
86                         return -EINVAL;
87                 }
88                 fsm->substate = next_state;
89         } while (delay == 0);
90         return delay;
91 }
92
93 /*
94  * Function sirdev_config_fsm
95  *
96  * State machine to handle the configuration of the device (and attached dongle, if any).
97  * This handler is scheduled for execution in kIrDAd context, so we can sleep.
98  * however, kIrDAd is shared by all sir_dev devices so we better don't sleep there too
99  * long. Instead, for longer delays we start a timer to reschedule us later.
100  * On entry, fsm->sem is always locked and the netdev xmit queue stopped.
101  * Both must be unlocked/restarted on completion - but only on final exit.
102  */
103
104 static void sirdev_config_fsm(struct work_struct *work)
105 {
106         struct sir_dev *dev = container_of(work, struct sir_dev, fsm.work.work);
107         struct sir_fsm *fsm = &dev->fsm;
108         int next_state;
109         int ret = -1;
110         unsigned delay;
111
112         IRDA_DEBUG(2, "%s(), <%ld>\n", __func__, jiffies);
113
114         do {
115                 IRDA_DEBUG(3, "%s - state=0x%04x / substate=0x%04x\n",
116                         __func__, fsm->state, fsm->substate);
117
118                 next_state = fsm->state;
119                 delay = 0;
120
121                 switch(fsm->state) {
122
123                 case SIRDEV_STATE_DONGLE_OPEN:
124                         if (dev->dongle_drv != NULL) {
125                                 ret = sirdev_put_dongle(dev);
126                                 if (ret) {
127                                         fsm->result = -EINVAL;
128                                         next_state = SIRDEV_STATE_ERROR;
129                                         break;
130                                 }
131                         }
132
133                         /* Initialize dongle */
134                         ret = sirdev_get_dongle(dev, fsm->param);
135                         if (ret) {
136                                 fsm->result = ret;
137                                 next_state = SIRDEV_STATE_ERROR;
138                                 break;
139                         }
140
141                         /* Dongles are powered through the modem control lines which
142                          * were just set during open. Before resetting, let's wait for
143                          * the power to stabilize. This is what some dongle drivers did
144                          * in open before, while others didn't - should be safe anyway.
145                          */
146
147                         delay = 50;
148                         fsm->substate = SIRDEV_STATE_DONGLE_RESET;
149                         next_state = SIRDEV_STATE_DONGLE_RESET;
150
151                         fsm->param = 9600;
152
153                         break;
154
155                 case SIRDEV_STATE_DONGLE_CLOSE:
156                         /* shouldn't we just treat this as success=? */
157                         if (dev->dongle_drv == NULL) {
158                                 fsm->result = -EINVAL;
159                                 next_state = SIRDEV_STATE_ERROR;
160                                 break;
161                         }
162
163                         ret = sirdev_put_dongle(dev);
164                         if (ret) {
165                                 fsm->result = ret;
166                                 next_state = SIRDEV_STATE_ERROR;
167                                 break;
168                         }
169                         next_state = SIRDEV_STATE_DONE;
170                         break;
171
172                 case SIRDEV_STATE_SET_DTR_RTS:
173                         ret = sirdev_set_dtr_rts(dev,
174                                 (fsm->param&0x02) ? TRUE : FALSE,
175                                 (fsm->param&0x01) ? TRUE : FALSE);
176                         next_state = SIRDEV_STATE_DONE;
177                         break;
178
179                 case SIRDEV_STATE_SET_SPEED:
180                         fsm->substate = SIRDEV_STATE_WAIT_XMIT;
181                         next_state = SIRDEV_STATE_DONGLE_CHECK;
182                         break;
183
184                 case SIRDEV_STATE_DONGLE_CHECK:
185                         ret = sirdev_tx_complete_fsm(dev);
186                         if (ret < 0) {
187                                 fsm->result = ret;
188                                 next_state = SIRDEV_STATE_ERROR;
189                                 break;
190                         }
191                         if ((delay=ret) != 0)
192                                 break;
193
194                         if (dev->dongle_drv) {
195                                 fsm->substate = SIRDEV_STATE_DONGLE_RESET;
196                                 next_state = SIRDEV_STATE_DONGLE_RESET;
197                         }
198                         else {
199                                 dev->speed = fsm->param;
200                                 next_state = SIRDEV_STATE_PORT_SPEED;
201                         }
202                         break;
203
204                 case SIRDEV_STATE_DONGLE_RESET:
205                         if (dev->dongle_drv->reset) {
206                                 ret = dev->dongle_drv->reset(dev);
207                                 if (ret < 0) {
208                                         fsm->result = ret;
209                                         next_state = SIRDEV_STATE_ERROR;
210                                         break;
211                                 }
212                         }
213                         else
214                                 ret = 0;
215                         if ((delay=ret) == 0) {
216                                 /* set serial port according to dongle default speed */
217                                 if (dev->drv->set_speed)
218                                         dev->drv->set_speed(dev, dev->speed);
219                                 fsm->substate = SIRDEV_STATE_DONGLE_SPEED;
220                                 next_state = SIRDEV_STATE_DONGLE_SPEED;
221                         }
222                         break;
223
224                 case SIRDEV_STATE_DONGLE_SPEED:
225                         if (dev->dongle_drv->reset) {
226                                 ret = dev->dongle_drv->set_speed(dev, fsm->param);
227                                 if (ret < 0) {
228                                         fsm->result = ret;
229                                         next_state = SIRDEV_STATE_ERROR;
230                                         break;
231                                 }
232                         }
233                         else
234                                 ret = 0;
235                         if ((delay=ret) == 0)
236                                 next_state = SIRDEV_STATE_PORT_SPEED;
237                         break;
238
239                 case SIRDEV_STATE_PORT_SPEED:
240                         /* Finally we are ready to change the serial port speed */
241                         if (dev->drv->set_speed)
242                                 dev->drv->set_speed(dev, dev->speed);
243                         dev->new_speed = 0;
244                         next_state = SIRDEV_STATE_DONE;
245                         break;
246
247                 case SIRDEV_STATE_DONE:
248                         /* Signal network layer so it can send more frames */
249                         netif_wake_queue(dev->netdev);
250                         next_state = SIRDEV_STATE_COMPLETE;
251                         break;
252
253                 default:
254                         IRDA_ERROR("%s - undefined state\n", __func__);
255                         fsm->result = -EINVAL;
256                         /* fall thru */
257
258                 case SIRDEV_STATE_ERROR:
259                         IRDA_ERROR("%s - error: %d\n", __func__, fsm->result);
260
261 #if 0   /* don't enable this before we have netdev->tx_timeout to recover */
262                         netif_stop_queue(dev->netdev);
263 #else
264                         netif_wake_queue(dev->netdev);
265 #endif
266                         /* fall thru */
267
268                 case SIRDEV_STATE_COMPLETE:
269                         /* config change finished, so we are not busy any longer */
270                         sirdev_enable_rx(dev);
271                         up(&fsm->sem);
272                         return;
273                 }
274                 fsm->state = next_state;
275         } while(!delay);
276
277         queue_delayed_work(irda_sir_wq, &fsm->work, msecs_to_jiffies(delay));
278 }
279
280 /* schedule some device configuration task for execution by kIrDAd
281  * on behalf of the above state machine.
282  * can be called from process or interrupt/tasklet context.
283  */
284
285 int sirdev_schedule_request(struct sir_dev *dev, int initial_state, unsigned param)
286 {
287         struct sir_fsm *fsm = &dev->fsm;
288
289         IRDA_DEBUG(2, "%s - state=0x%04x / param=%u\n", __func__,
290                         initial_state, param);
291
292         if (down_trylock(&fsm->sem)) {
293                 if (in_interrupt()  ||  in_atomic()  ||  irqs_disabled()) {
294                         IRDA_DEBUG(1, "%s(), state machine busy!\n", __func__);
295                         return -EWOULDBLOCK;
296                 } else
297                         down(&fsm->sem);
298         }
299
300         if (fsm->state == SIRDEV_STATE_DEAD) {
301                 /* race with sirdev_close should never happen */
302                 IRDA_ERROR("%s(), instance staled!\n", __func__);
303                 up(&fsm->sem);
304                 return -ESTALE;         /* or better EPIPE? */
305         }
306
307         netif_stop_queue(dev->netdev);
308         atomic_set(&dev->enable_rx, 0);
309
310         fsm->state = initial_state;
311         fsm->param = param;
312         fsm->result = 0;
313
314         INIT_DELAYED_WORK(&fsm->work, sirdev_config_fsm);
315         queue_delayed_work(irda_sir_wq, &fsm->work, 0);
316         return 0;
317 }
318
319
320 /***************************************************************************/
321
322 void sirdev_enable_rx(struct sir_dev *dev)
323 {
324         if (unlikely(atomic_read(&dev->enable_rx)))
325                 return;
326
327         /* flush rx-buffer - should also help in case of problems with echo cancelation */
328         dev->rx_buff.data = dev->rx_buff.head;
329         dev->rx_buff.len = 0;
330         dev->rx_buff.in_frame = FALSE;
331         dev->rx_buff.state = OUTSIDE_FRAME;
332         atomic_set(&dev->enable_rx, 1);
333 }
334
335 static int sirdev_is_receiving(struct sir_dev *dev)
336 {
337         if (!atomic_read(&dev->enable_rx))
338                 return 0;
339
340         return dev->rx_buff.state != OUTSIDE_FRAME;
341 }
342
343 int sirdev_set_dongle(struct sir_dev *dev, IRDA_DONGLE type)
344 {
345         int err;
346
347         IRDA_DEBUG(3, "%s : requesting dongle %d.\n", __func__, type);
348
349         err = sirdev_schedule_dongle_open(dev, type);
350         if (unlikely(err))
351                 return err;
352         down(&dev->fsm.sem);            /* block until config change completed */
353         err = dev->fsm.result;
354         up(&dev->fsm.sem);
355         return err;
356 }
357 EXPORT_SYMBOL(sirdev_set_dongle);
358
359 /* used by dongle drivers for dongle programming */
360
361 int sirdev_raw_write(struct sir_dev *dev, const char *buf, int len)
362 {
363         unsigned long flags;
364         int ret;
365
366         if (unlikely(len > dev->tx_buff.truesize))
367                 return -ENOSPC;
368
369         spin_lock_irqsave(&dev->tx_lock, flags);        /* serialize with other tx operations */
370         while (dev->tx_buff.len > 0) {                  /* wait until tx idle */
371                 spin_unlock_irqrestore(&dev->tx_lock, flags);
372                 msleep(10);
373                 spin_lock_irqsave(&dev->tx_lock, flags);
374         }
375
376         dev->tx_buff.data = dev->tx_buff.head;
377         memcpy(dev->tx_buff.data, buf, len);    
378         dev->tx_buff.len = len;
379
380         ret = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
381         if (ret > 0) {
382                 IRDA_DEBUG(3, "%s(), raw-tx started\n", __func__);
383
384                 dev->tx_buff.data += ret;
385                 dev->tx_buff.len -= ret;
386                 dev->raw_tx = 1;
387                 ret = len;              /* all data is going to be sent */
388         }
389         spin_unlock_irqrestore(&dev->tx_lock, flags);
390         return ret;
391 }
392 EXPORT_SYMBOL(sirdev_raw_write);
393
394 /* seems some dongle drivers may need this */
395
396 int sirdev_raw_read(struct sir_dev *dev, char *buf, int len)
397 {
398         int count;
399
400         if (atomic_read(&dev->enable_rx))
401                 return -EIO;            /* fail if we expect irda-frames */
402
403         count = (len < dev->rx_buff.len) ? len : dev->rx_buff.len;
404
405         if (count > 0) {
406                 memcpy(buf, dev->rx_buff.data, count);
407                 dev->rx_buff.data += count;
408                 dev->rx_buff.len -= count;
409         }
410
411         /* remaining stuff gets flushed when re-enabling normal rx */
412
413         return count;
414 }
415 EXPORT_SYMBOL(sirdev_raw_read);
416
417 int sirdev_set_dtr_rts(struct sir_dev *dev, int dtr, int rts)
418 {
419         int ret = -ENXIO;
420         if (dev->drv->set_dtr_rts)
421                 ret =  dev->drv->set_dtr_rts(dev, dtr, rts);
422         return ret;
423 }
424 EXPORT_SYMBOL(sirdev_set_dtr_rts);
425
426 /**********************************************************************/
427
428 /* called from client driver - likely with bh-context - to indicate
429  * it made some progress with transmission. Hence we send the next
430  * chunk, if any, or complete the skb otherwise
431  */
432
433 void sirdev_write_complete(struct sir_dev *dev)
434 {
435         unsigned long flags;
436         struct sk_buff *skb;
437         int actual = 0;
438         int err;
439         
440         spin_lock_irqsave(&dev->tx_lock, flags);
441
442         IRDA_DEBUG(3, "%s() - dev->tx_buff.len = %d\n",
443                    __func__, dev->tx_buff.len);
444
445         if (likely(dev->tx_buff.len > 0))  {
446                 /* Write data left in transmit buffer */
447                 actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
448
449                 if (likely(actual>0)) {
450                         dev->tx_buff.data += actual;
451                         dev->tx_buff.len  -= actual;
452                 }
453                 else if (unlikely(actual<0)) {
454                         /* could be dropped later when we have tx_timeout to recover */
455                         IRDA_ERROR("%s: drv->do_write failed (%d)\n",
456                                    __func__, actual);
457                         if ((skb=dev->tx_skb) != NULL) {
458                                 dev->tx_skb = NULL;
459                                 dev_kfree_skb_any(skb);
460                                 dev->netdev->stats.tx_errors++;
461                                 dev->netdev->stats.tx_dropped++;
462                         }
463                         dev->tx_buff.len = 0;
464                 }
465                 if (dev->tx_buff.len > 0)
466                         goto done;      /* more data to send later */
467         }
468
469         if (unlikely(dev->raw_tx != 0)) {
470                 /* in raw mode we are just done now after the buffer was sent
471                  * completely. Since this was requested by some dongle driver
472                  * running under the control of the irda-thread we must take
473                  * care here not to re-enable the queue. The queue will be
474                  * restarted when the irda-thread has completed the request.
475                  */
476
477                 IRDA_DEBUG(3, "%s(), raw-tx done\n", __func__);
478                 dev->raw_tx = 0;
479                 goto done;      /* no post-frame handling in raw mode */
480         }
481
482         /* we have finished now sending this skb.
483          * update statistics and free the skb.
484          * finally we check and trigger a pending speed change, if any.
485          * if not we switch to rx mode and wake the queue for further
486          * packets.
487          * note the scheduled speed request blocks until the lower
488          * client driver and the corresponding hardware has really
489          * finished sending all data (xmit fifo drained f.e.)
490          * before the speed change gets finally done and the queue
491          * re-activated.
492          */
493
494         IRDA_DEBUG(5, "%s(), finished with frame!\n", __func__);
495                 
496         if ((skb=dev->tx_skb) != NULL) {
497                 dev->tx_skb = NULL;
498                 dev->netdev->stats.tx_packets++;
499                 dev->netdev->stats.tx_bytes += skb->len;
500                 dev_kfree_skb_any(skb);
501         }
502
503         if (unlikely(dev->new_speed > 0)) {
504                 IRDA_DEBUG(5, "%s(), Changing speed!\n", __func__);
505                 err = sirdev_schedule_speed(dev, dev->new_speed);
506                 if (unlikely(err)) {
507                         /* should never happen
508                          * forget the speed change and hope the stack recovers
509                          */
510                         IRDA_ERROR("%s - schedule speed change failed: %d\n",
511                                    __func__, err);
512                         netif_wake_queue(dev->netdev);
513                 }
514                 /* else: success
515                  *      speed change in progress now
516                  *      on completion dev->new_speed gets cleared,
517                  *      rx-reenabled and the queue restarted
518                  */
519         }
520         else {
521                 sirdev_enable_rx(dev);
522                 netif_wake_queue(dev->netdev);
523         }
524
525 done:
526         spin_unlock_irqrestore(&dev->tx_lock, flags);
527 }
528 EXPORT_SYMBOL(sirdev_write_complete);
529
530 /* called from client driver - likely with bh-context - to give us
531  * some more received bytes. We put them into the rx-buffer,
532  * normally unwrapping and building LAP-skb's (unless rx disabled)
533  */
534
535 int sirdev_receive(struct sir_dev *dev, const unsigned char *cp, size_t count) 
536 {
537         if (!dev || !dev->netdev) {
538                 IRDA_WARNING("%s(), not ready yet!\n", __func__);
539                 return -1;
540         }
541
542         if (!dev->irlap) {
543                 IRDA_WARNING("%s - too early: %p / %zd!\n",
544                              __func__, cp, count);
545                 return -1;
546         }
547
548         if (cp==NULL) {
549                 /* error already at lower level receive
550                  * just update stats and set media busy
551                  */
552                 irda_device_set_media_busy(dev->netdev, TRUE);
553                 dev->netdev->stats.rx_dropped++;
554                 IRDA_DEBUG(0, "%s; rx-drop: %zd\n", __func__, count);
555                 return 0;
556         }
557
558         /* Read the characters into the buffer */
559         if (likely(atomic_read(&dev->enable_rx))) {
560                 while (count--)
561                         /* Unwrap and destuff one byte */
562                         async_unwrap_char(dev->netdev, &dev->netdev->stats,
563                                           &dev->rx_buff, *cp++);
564         } else {
565                 while (count--) {
566                         /* rx not enabled: save the raw bytes and never
567                          * trigger any netif_rx. The received bytes are flushed
568                          * later when we re-enable rx but might be read meanwhile
569                          * by the dongle driver.
570                          */
571                         dev->rx_buff.data[dev->rx_buff.len++] = *cp++;
572
573                         /* What should we do when the buffer is full? */
574                         if (unlikely(dev->rx_buff.len == dev->rx_buff.truesize))
575                                 dev->rx_buff.len = 0;
576                 }
577         }
578
579         return 0;
580 }
581 EXPORT_SYMBOL(sirdev_receive);
582
583 /**********************************************************************/
584
585 /* callbacks from network layer */
586
587 static netdev_tx_t sirdev_hard_xmit(struct sk_buff *skb,
588                                           struct net_device *ndev)
589 {
590         struct sir_dev *dev = netdev_priv(ndev);
591         unsigned long flags;
592         int actual = 0;
593         int err;
594         s32 speed;
595
596         IRDA_ASSERT(dev != NULL, return NETDEV_TX_OK;);
597
598         netif_stop_queue(ndev);
599
600         IRDA_DEBUG(3, "%s(), skb->len = %d\n", __func__, skb->len);
601
602         speed = irda_get_next_speed(skb);
603         if ((speed != dev->speed) && (speed != -1)) {
604                 if (!skb->len) {
605                         err = sirdev_schedule_speed(dev, speed);
606                         if (unlikely(err == -EWOULDBLOCK)) {
607                                 /* Failed to initiate the speed change, likely the fsm
608                                  * is still busy (pretty unlikely, but...)
609                                  * We refuse to accept the skb and return with the queue
610                                  * stopped so the network layer will retry after the
611                                  * fsm completes and wakes the queue.
612                                  */
613                                  return NETDEV_TX_BUSY;
614                         }
615                         else if (unlikely(err)) {
616                                 /* other fatal error - forget the speed change and
617                                  * hope the stack will recover somehow
618                                  */
619                                  netif_start_queue(ndev);
620                         }
621                         /* else: success
622                          *      speed change in progress now
623                          *      on completion the queue gets restarted
624                          */
625
626                         dev_kfree_skb_any(skb);
627                         return NETDEV_TX_OK;
628                 } else
629                         dev->new_speed = speed;
630         }
631
632         /* Init tx buffer*/
633         dev->tx_buff.data = dev->tx_buff.head;
634
635         /* Check problems */
636         if(spin_is_locked(&dev->tx_lock)) {
637                 IRDA_DEBUG(3, "%s(), write not completed\n", __func__);
638         }
639
640         /* serialize with write completion */
641         spin_lock_irqsave(&dev->tx_lock, flags);
642
643         /* Copy skb to tx_buff while wrapping, stuffing and making CRC */
644         dev->tx_buff.len = async_wrap_skb(skb, dev->tx_buff.data, dev->tx_buff.truesize); 
645
646         /* transmission will start now - disable receive.
647          * if we are just in the middle of an incoming frame,
648          * treat it as collision. probably it's a good idea to
649          * reset the rx_buf OUTSIDE_FRAME in this case too?
650          */
651         atomic_set(&dev->enable_rx, 0);
652         if (unlikely(sirdev_is_receiving(dev)))
653                 dev->netdev->stats.collisions++;
654
655         actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
656
657         if (likely(actual > 0)) {
658                 dev->tx_skb = skb;
659                 dev->tx_buff.data += actual;
660                 dev->tx_buff.len -= actual;
661         }
662         else if (unlikely(actual < 0)) {
663                 /* could be dropped later when we have tx_timeout to recover */
664                 IRDA_ERROR("%s: drv->do_write failed (%d)\n",
665                            __func__, actual);
666                 dev_kfree_skb_any(skb);
667                 dev->netdev->stats.tx_errors++;
668                 dev->netdev->stats.tx_dropped++;
669                 netif_wake_queue(ndev);
670         }
671         spin_unlock_irqrestore(&dev->tx_lock, flags);
672
673         return NETDEV_TX_OK;
674 }
675
676 /* called from network layer with rtnl hold */
677
678 static int sirdev_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
679 {
680         struct if_irda_req *irq = (struct if_irda_req *) rq;
681         struct sir_dev *dev = netdev_priv(ndev);
682         int ret = 0;
683
684         IRDA_ASSERT(dev != NULL, return -1;);
685
686         IRDA_DEBUG(3, "%s(), %s, (cmd=0x%X)\n", __func__, ndev->name, cmd);
687         
688         switch (cmd) {
689         case SIOCSBANDWIDTH: /* Set bandwidth */
690                 if (!capable(CAP_NET_ADMIN))
691                         ret = -EPERM;
692                 else
693                         ret = sirdev_schedule_speed(dev, irq->ifr_baudrate);
694                 /* cannot sleep here for completion
695                  * we are called from network layer with rtnl hold
696                  */
697                 break;
698
699         case SIOCSDONGLE: /* Set dongle */
700                 if (!capable(CAP_NET_ADMIN))
701                         ret = -EPERM;
702                 else
703                         ret = sirdev_schedule_dongle_open(dev, irq->ifr_dongle);
704                 /* cannot sleep here for completion
705                  * we are called from network layer with rtnl hold
706                  */
707                 break;
708
709         case SIOCSMEDIABUSY: /* Set media busy */
710                 if (!capable(CAP_NET_ADMIN))
711                         ret = -EPERM;
712                 else
713                         irda_device_set_media_busy(dev->netdev, TRUE);
714                 break;
715
716         case SIOCGRECEIVING: /* Check if we are receiving right now */
717                 irq->ifr_receiving = sirdev_is_receiving(dev);
718                 break;
719
720         case SIOCSDTRRTS:
721                 if (!capable(CAP_NET_ADMIN))
722                         ret = -EPERM;
723                 else
724                         ret = sirdev_schedule_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts);
725                 /* cannot sleep here for completion
726                  * we are called from network layer with rtnl hold
727                  */
728                 break;
729
730         case SIOCSMODE:
731 #if 0
732                 if (!capable(CAP_NET_ADMIN))
733                         ret = -EPERM;
734                 else
735                         ret = sirdev_schedule_mode(dev, irq->ifr_mode);
736                 /* cannot sleep here for completion
737                  * we are called from network layer with rtnl hold
738                  */
739                 break;
740 #endif
741         default:
742                 ret = -EOPNOTSUPP;
743         }
744         
745         return ret;
746 }
747
748 /* ----------------------------------------------------------------------------- */
749
750 #define SIRBUF_ALLOCSIZE 4269   /* worst case size of a wrapped IrLAP frame */
751
752 static int sirdev_alloc_buffers(struct sir_dev *dev)
753 {
754         dev->tx_buff.truesize = SIRBUF_ALLOCSIZE;
755         dev->rx_buff.truesize = IRDA_SKB_MAX_MTU; 
756
757         /* Bootstrap ZeroCopy Rx */
758         dev->rx_buff.skb = __netdev_alloc_skb(dev->netdev, dev->rx_buff.truesize,
759                                               GFP_KERNEL);
760         if (dev->rx_buff.skb == NULL)
761                 return -ENOMEM;
762         skb_reserve(dev->rx_buff.skb, 1);
763         dev->rx_buff.head = dev->rx_buff.skb->data;
764
765         dev->tx_buff.head = kmalloc(dev->tx_buff.truesize, GFP_KERNEL);
766         if (dev->tx_buff.head == NULL) {
767                 kfree_skb(dev->rx_buff.skb);
768                 dev->rx_buff.skb = NULL;
769                 dev->rx_buff.head = NULL;
770                 return -ENOMEM;
771         }
772
773         dev->tx_buff.data = dev->tx_buff.head;
774         dev->rx_buff.data = dev->rx_buff.head;
775         dev->tx_buff.len = 0;
776         dev->rx_buff.len = 0;
777
778         dev->rx_buff.in_frame = FALSE;
779         dev->rx_buff.state = OUTSIDE_FRAME;
780         return 0;
781 };
782
783 static void sirdev_free_buffers(struct sir_dev *dev)
784 {
785         kfree_skb(dev->rx_buff.skb);
786         kfree(dev->tx_buff.head);
787         dev->rx_buff.head = dev->tx_buff.head = NULL;
788         dev->rx_buff.skb = NULL;
789 }
790
791 static int sirdev_open(struct net_device *ndev)
792 {
793         struct sir_dev *dev = netdev_priv(ndev);
794         const struct sir_driver *drv = dev->drv;
795
796         if (!drv)
797                 return -ENODEV;
798
799         /* increase the reference count of the driver module before doing serious stuff */
800         if (!try_module_get(drv->owner))
801                 return -ESTALE;
802
803         IRDA_DEBUG(2, "%s()\n", __func__);
804
805         if (sirdev_alloc_buffers(dev))
806                 goto errout_dec;
807
808         if (!dev->drv->start_dev  ||  dev->drv->start_dev(dev))
809                 goto errout_free;
810
811         sirdev_enable_rx(dev);
812         dev->raw_tx = 0;
813
814         netif_start_queue(ndev);
815         dev->irlap = irlap_open(ndev, &dev->qos, dev->hwname);
816         if (!dev->irlap)
817                 goto errout_stop;
818
819         netif_wake_queue(ndev);
820
821         IRDA_DEBUG(2, "%s - done, speed = %d\n", __func__, dev->speed);
822
823         return 0;
824
825 errout_stop:
826         atomic_set(&dev->enable_rx, 0);
827         if (dev->drv->stop_dev)
828                 dev->drv->stop_dev(dev);
829 errout_free:
830         sirdev_free_buffers(dev);
831 errout_dec:
832         module_put(drv->owner);
833         return -EAGAIN;
834 }
835
836 static int sirdev_close(struct net_device *ndev)
837 {
838         struct sir_dev *dev = netdev_priv(ndev);
839         const struct sir_driver *drv;
840
841 //      IRDA_DEBUG(0, "%s\n", __func__);
842
843         netif_stop_queue(ndev);
844
845         down(&dev->fsm.sem);            /* block on pending config completion */
846
847         atomic_set(&dev->enable_rx, 0);
848
849         if (unlikely(!dev->irlap))
850                 goto out;
851         irlap_close(dev->irlap);
852         dev->irlap = NULL;
853
854         drv = dev->drv;
855         if (unlikely(!drv  ||  !dev->priv))
856                 goto out;
857
858         if (drv->stop_dev)
859                 drv->stop_dev(dev);
860
861         sirdev_free_buffers(dev);
862         module_put(drv->owner);
863
864 out:
865         dev->speed = 0;
866         up(&dev->fsm.sem);
867         return 0;
868 }
869
870 static const struct net_device_ops sirdev_ops = {
871         .ndo_start_xmit = sirdev_hard_xmit,
872         .ndo_open       = sirdev_open,
873         .ndo_stop       = sirdev_close,
874         .ndo_do_ioctl   = sirdev_ioctl,
875 };
876 /* ----------------------------------------------------------------------------- */
877
878 struct sir_dev * sirdev_get_instance(const struct sir_driver *drv, const char *name)
879 {
880         struct net_device *ndev;
881         struct sir_dev *dev;
882
883         IRDA_DEBUG(0, "%s - %s\n", __func__, name);
884
885         /* instead of adding tests to protect against drv->do_write==NULL
886          * at several places we refuse to create a sir_dev instance for
887          * drivers which don't implement do_write.
888          */
889         if (!drv ||  !drv->do_write)
890                 return NULL;
891
892         /*
893          *  Allocate new instance of the device
894          */
895         ndev = alloc_irdadev(sizeof(*dev));
896         if (ndev == NULL) {
897                 IRDA_ERROR("%s - Can't allocate memory for IrDA control block!\n", __func__);
898                 goto out;
899         }
900         dev = netdev_priv(ndev);
901
902         irda_init_max_qos_capabilies(&dev->qos);
903         dev->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
904         dev->qos.min_turn_time.bits = drv->qos_mtt_bits;
905         irda_qos_bits_to_value(&dev->qos);
906
907         strncpy(dev->hwname, name, sizeof(dev->hwname)-1);
908
909         atomic_set(&dev->enable_rx, 0);
910         dev->tx_skb = NULL;
911
912         spin_lock_init(&dev->tx_lock);
913         sema_init(&dev->fsm.sem, 1);
914
915         dev->drv = drv;
916         dev->netdev = ndev;
917
918         /* Override the network functions we need to use */
919         ndev->netdev_ops = &sirdev_ops;
920
921         if (register_netdev(ndev)) {
922                 IRDA_ERROR("%s(), register_netdev() failed!\n", __func__);
923                 goto out_freenetdev;
924         }
925
926         return dev;
927
928 out_freenetdev:
929         free_netdev(ndev);
930 out:
931         return NULL;
932 }
933 EXPORT_SYMBOL(sirdev_get_instance);
934
935 int sirdev_put_instance(struct sir_dev *dev)
936 {
937         int err = 0;
938
939         IRDA_DEBUG(0, "%s\n", __func__);
940
941         atomic_set(&dev->enable_rx, 0);
942
943         netif_carrier_off(dev->netdev);
944         netif_device_detach(dev->netdev);
945
946         if (dev->dongle_drv)
947                 err = sirdev_schedule_dongle_close(dev);
948         if (err)
949                 IRDA_ERROR("%s - error %d\n", __func__, err);
950
951         sirdev_close(dev->netdev);
952
953         down(&dev->fsm.sem);
954         dev->fsm.state = SIRDEV_STATE_DEAD;     /* mark staled */
955         dev->dongle_drv = NULL;
956         dev->priv = NULL;
957         up(&dev->fsm.sem);
958
959         /* Remove netdevice */
960         unregister_netdev(dev->netdev);
961
962         free_netdev(dev->netdev);
963
964         return 0;
965 }
966 EXPORT_SYMBOL(sirdev_put_instance);
967
968 static int __init sir_wq_init(void)
969 {
970         irda_sir_wq = create_singlethread_workqueue("irda_sir_wq");
971         if (!irda_sir_wq)
972                 return -ENOMEM;
973         return 0;
974 }
975
976 static void __exit sir_wq_exit(void)
977 {
978         destroy_workqueue(irda_sir_wq);
979 }
980
981 module_init(sir_wq_init);
982 module_exit(sir_wq_exit);
983
984 MODULE_AUTHOR("Martin Diehl <info@mdiehl.de>");
985 MODULE_DESCRIPTION("IrDA SIR core");
986 MODULE_LICENSE("GPL");