irda: convert to netdev_tx_t
[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/init.h>
17 #include <linux/delay.h>
18
19 #include <net/irda/irda.h>
20 #include <net/irda/wrapper.h>
21 #include <net/irda/irda_device.h>
22
23 #include "sir-dev.h"
24
25
26 static struct workqueue_struct *irda_sir_wq;
27
28 /* STATE MACHINE */
29
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
32  */
33
34 static int sirdev_tx_complete_fsm(struct sir_dev *dev)
35 {
36         struct sir_fsm *fsm = &dev->fsm;
37         unsigned next_state, delay;
38         unsigned bytes_left;
39
40         do {
41                 next_state = fsm->substate;     /* default: stay in current substate */
42                 delay = 0;
43
44                 switch(fsm->substate) {
45
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;
54                         }
55
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;
67                         }
68                         /* sleep some longer delay (msec) */
69                         delay = (delay+999) / 1000;
70                         break;
71
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;
78
79                 case SIRDEV_STATE_TX_DONE:
80                         return 0;
81
82                 default:
83                         IRDA_ERROR("%s - undefined state\n", __func__);
84                         return -EINVAL;
85                 }
86                 fsm->substate = next_state;
87         } while (delay == 0);
88         return delay;
89 }
90
91 /*
92  * Function sirdev_config_fsm
93  *
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.
100  */
101
102 static void sirdev_config_fsm(struct work_struct *work)
103 {
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;
109
110         IRDA_DEBUG(2, "%s(), <%ld>\n", __func__, jiffies);
111
112         do {
113                 IRDA_DEBUG(3, "%s - state=0x%04x / substate=0x%04x\n",
114                         __func__, fsm->state, fsm->substate);
115
116                 next_state = fsm->state;
117                 delay = 0;
118
119                 switch(fsm->state) {
120
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;
128                                 }
129                         }
130
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;
137                         }
138
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.
143                          */
144
145                         delay = 50;
146                         fsm->substate = SIRDEV_STATE_DONGLE_RESET;
147                         next_state = SIRDEV_STATE_DONGLE_RESET;
148
149                         fsm->param = 9600;
150
151                         break;
152
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;
159                         }
160
161                         ret = sirdev_put_dongle(dev);
162                         if (ret) {
163                                 fsm->result = ret;
164                                 next_state = SIRDEV_STATE_ERROR;
165                                 break;
166                         }
167                         next_state = SIRDEV_STATE_DONE;
168                         break;
169
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;
176
177                 case SIRDEV_STATE_SET_SPEED:
178                         fsm->substate = SIRDEV_STATE_WAIT_XMIT;
179                         next_state = SIRDEV_STATE_DONGLE_CHECK;
180                         break;
181
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;
188                         }
189                         if ((delay=ret) != 0)
190                                 break;
191
192                         if (dev->dongle_drv) {
193                                 fsm->substate = SIRDEV_STATE_DONGLE_RESET;
194                                 next_state = SIRDEV_STATE_DONGLE_RESET;
195                         }
196                         else {
197                                 dev->speed = fsm->param;
198                                 next_state = SIRDEV_STATE_PORT_SPEED;
199                         }
200                         break;
201
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;
209                                 }
210                         }
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;
219                         }
220                         break;
221
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;
229                                 }
230                         }
231                         else
232                                 ret = 0;
233                         if ((delay=ret) == 0)
234                                 next_state = SIRDEV_STATE_PORT_SPEED;
235                         break;
236
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;
244
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;
250
251                 default:
252                         IRDA_ERROR("%s - undefined state\n", __func__);
253                         fsm->result = -EINVAL;
254                         /* fall thru */
255
256                 case SIRDEV_STATE_ERROR:
257                         IRDA_ERROR("%s - error: %d\n", __func__, fsm->result);
258
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 */
265
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;
271                 }
272                 fsm->state = next_state;
273         } while(!delay);
274
275         queue_delayed_work(irda_sir_wq, &fsm->work, msecs_to_jiffies(delay));
276 }
277
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.
281  */
282
283 int sirdev_schedule_request(struct sir_dev *dev, int initial_state, unsigned param)
284 {
285         struct sir_fsm *fsm = &dev->fsm;
286
287         IRDA_DEBUG(2, "%s - state=0x%04x / param=%u\n", __func__,
288                         initial_state, param);
289
290         if (down_trylock(&fsm->sem)) {
291                 if (in_interrupt()  ||  in_atomic()  ||  irqs_disabled()) {
292                         IRDA_DEBUG(1, "%s(), state machine busy!\n", __func__);
293                         return -EWOULDBLOCK;
294                 } else
295                         down(&fsm->sem);
296         }
297
298         if (fsm->state == SIRDEV_STATE_DEAD) {
299                 /* race with sirdev_close should never happen */
300                 IRDA_ERROR("%s(), instance staled!\n", __func__);
301                 up(&fsm->sem);
302                 return -ESTALE;         /* or better EPIPE? */
303         }
304
305         netif_stop_queue(dev->netdev);
306         atomic_set(&dev->enable_rx, 0);
307
308         fsm->state = initial_state;
309         fsm->param = param;
310         fsm->result = 0;
311
312         INIT_DELAYED_WORK(&fsm->work, sirdev_config_fsm);
313         queue_delayed_work(irda_sir_wq, &fsm->work, 0);
314         return 0;
315 }
316
317
318 /***************************************************************************/
319
320 void sirdev_enable_rx(struct sir_dev *dev)
321 {
322         if (unlikely(atomic_read(&dev->enable_rx)))
323                 return;
324
325         /* flush rx-buffer - should also help in case of problems with echo cancelation */
326         dev->rx_buff.data = dev->rx_buff.head;
327         dev->rx_buff.len = 0;
328         dev->rx_buff.in_frame = FALSE;
329         dev->rx_buff.state = OUTSIDE_FRAME;
330         atomic_set(&dev->enable_rx, 1);
331 }
332
333 static int sirdev_is_receiving(struct sir_dev *dev)
334 {
335         if (!atomic_read(&dev->enable_rx))
336                 return 0;
337
338         return (dev->rx_buff.state != OUTSIDE_FRAME);
339 }
340
341 int sirdev_set_dongle(struct sir_dev *dev, IRDA_DONGLE type)
342 {
343         int err;
344
345         IRDA_DEBUG(3, "%s : requesting dongle %d.\n", __func__, type);
346
347         err = sirdev_schedule_dongle_open(dev, type);
348         if (unlikely(err))
349                 return err;
350         down(&dev->fsm.sem);            /* block until config change completed */
351         err = dev->fsm.result;
352         up(&dev->fsm.sem);
353         return err;
354 }
355 EXPORT_SYMBOL(sirdev_set_dongle);
356
357 /* used by dongle drivers for dongle programming */
358
359 int sirdev_raw_write(struct sir_dev *dev, const char *buf, int len)
360 {
361         unsigned long flags;
362         int ret;
363
364         if (unlikely(len > dev->tx_buff.truesize))
365                 return -ENOSPC;
366
367         spin_lock_irqsave(&dev->tx_lock, flags);        /* serialize with other tx operations */
368         while (dev->tx_buff.len > 0) {                  /* wait until tx idle */
369                 spin_unlock_irqrestore(&dev->tx_lock, flags);
370                 msleep(10);
371                 spin_lock_irqsave(&dev->tx_lock, flags);
372         }
373
374         dev->tx_buff.data = dev->tx_buff.head;
375         memcpy(dev->tx_buff.data, buf, len);    
376         dev->tx_buff.len = len;
377
378         ret = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
379         if (ret > 0) {
380                 IRDA_DEBUG(3, "%s(), raw-tx started\n", __func__);
381
382                 dev->tx_buff.data += ret;
383                 dev->tx_buff.len -= ret;
384                 dev->raw_tx = 1;
385                 ret = len;              /* all data is going to be sent */
386         }
387         spin_unlock_irqrestore(&dev->tx_lock, flags);
388         return ret;
389 }
390 EXPORT_SYMBOL(sirdev_raw_write);
391
392 /* seems some dongle drivers may need this */
393
394 int sirdev_raw_read(struct sir_dev *dev, char *buf, int len)
395 {
396         int count;
397
398         if (atomic_read(&dev->enable_rx))
399                 return -EIO;            /* fail if we expect irda-frames */
400
401         count = (len < dev->rx_buff.len) ? len : dev->rx_buff.len;
402
403         if (count > 0) {
404                 memcpy(buf, dev->rx_buff.data, count);
405                 dev->rx_buff.data += count;
406                 dev->rx_buff.len -= count;
407         }
408
409         /* remaining stuff gets flushed when re-enabling normal rx */
410
411         return count;
412 }
413 EXPORT_SYMBOL(sirdev_raw_read);
414
415 int sirdev_set_dtr_rts(struct sir_dev *dev, int dtr, int rts)
416 {
417         int ret = -ENXIO;
418         if (dev->drv->set_dtr_rts)
419                 ret =  dev->drv->set_dtr_rts(dev, dtr, rts);
420         return ret;
421 }
422 EXPORT_SYMBOL(sirdev_set_dtr_rts);
423
424 /**********************************************************************/
425
426 /* called from client driver - likely with bh-context - to indicate
427  * it made some progress with transmission. Hence we send the next
428  * chunk, if any, or complete the skb otherwise
429  */
430
431 void sirdev_write_complete(struct sir_dev *dev)
432 {
433         unsigned long flags;
434         struct sk_buff *skb;
435         int actual = 0;
436         int err;
437         
438         spin_lock_irqsave(&dev->tx_lock, flags);
439
440         IRDA_DEBUG(3, "%s() - dev->tx_buff.len = %d\n",
441                    __func__, dev->tx_buff.len);
442
443         if (likely(dev->tx_buff.len > 0))  {
444                 /* Write data left in transmit buffer */
445                 actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
446
447                 if (likely(actual>0)) {
448                         dev->tx_buff.data += actual;
449                         dev->tx_buff.len  -= actual;
450                 }
451                 else if (unlikely(actual<0)) {
452                         /* could be dropped later when we have tx_timeout to recover */
453                         IRDA_ERROR("%s: drv->do_write failed (%d)\n",
454                                    __func__, actual);
455                         if ((skb=dev->tx_skb) != NULL) {
456                                 dev->tx_skb = NULL;
457                                 dev_kfree_skb_any(skb);
458                                 dev->netdev->stats.tx_errors++;
459                                 dev->netdev->stats.tx_dropped++;
460                         }
461                         dev->tx_buff.len = 0;
462                 }
463                 if (dev->tx_buff.len > 0)
464                         goto done;      /* more data to send later */
465         }
466
467         if (unlikely(dev->raw_tx != 0)) {
468                 /* in raw mode we are just done now after the buffer was sent
469                  * completely. Since this was requested by some dongle driver
470                  * running under the control of the irda-thread we must take
471                  * care here not to re-enable the queue. The queue will be
472                  * restarted when the irda-thread has completed the request.
473                  */
474
475                 IRDA_DEBUG(3, "%s(), raw-tx done\n", __func__);
476                 dev->raw_tx = 0;
477                 goto done;      /* no post-frame handling in raw mode */
478         }
479
480         /* we have finished now sending this skb.
481          * update statistics and free the skb.
482          * finally we check and trigger a pending speed change, if any.
483          * if not we switch to rx mode and wake the queue for further
484          * packets.
485          * note the scheduled speed request blocks until the lower
486          * client driver and the corresponding hardware has really
487          * finished sending all data (xmit fifo drained f.e.)
488          * before the speed change gets finally done and the queue
489          * re-activated.
490          */
491
492         IRDA_DEBUG(5, "%s(), finished with frame!\n", __func__);
493                 
494         if ((skb=dev->tx_skb) != NULL) {
495                 dev->tx_skb = NULL;
496                 dev->netdev->stats.tx_packets++;
497                 dev->netdev->stats.tx_bytes += skb->len;
498                 dev_kfree_skb_any(skb);
499         }
500
501         if (unlikely(dev->new_speed > 0)) {
502                 IRDA_DEBUG(5, "%s(), Changing speed!\n", __func__);
503                 err = sirdev_schedule_speed(dev, dev->new_speed);
504                 if (unlikely(err)) {
505                         /* should never happen
506                          * forget the speed change and hope the stack recovers
507                          */
508                         IRDA_ERROR("%s - schedule speed change failed: %d\n",
509                                    __func__, err);
510                         netif_wake_queue(dev->netdev);
511                 }
512                 /* else: success
513                  *      speed change in progress now
514                  *      on completion dev->new_speed gets cleared,
515                  *      rx-reenabled and the queue restarted
516                  */
517         }
518         else {
519                 sirdev_enable_rx(dev);
520                 netif_wake_queue(dev->netdev);
521         }
522
523 done:
524         spin_unlock_irqrestore(&dev->tx_lock, flags);
525 }
526 EXPORT_SYMBOL(sirdev_write_complete);
527
528 /* called from client driver - likely with bh-context - to give us
529  * some more received bytes. We put them into the rx-buffer,
530  * normally unwrapping and building LAP-skb's (unless rx disabled)
531  */
532
533 int sirdev_receive(struct sir_dev *dev, const unsigned char *cp, size_t count) 
534 {
535         if (!dev || !dev->netdev) {
536                 IRDA_WARNING("%s(), not ready yet!\n", __func__);
537                 return -1;
538         }
539
540         if (!dev->irlap) {
541                 IRDA_WARNING("%s - too early: %p / %zd!\n",
542                              __func__, cp, count);
543                 return -1;
544         }
545
546         if (cp==NULL) {
547                 /* error already at lower level receive
548                  * just update stats and set media busy
549                  */
550                 irda_device_set_media_busy(dev->netdev, TRUE);
551                 dev->netdev->stats.rx_dropped++;
552                 IRDA_DEBUG(0, "%s; rx-drop: %zd\n", __func__, count);
553                 return 0;
554         }
555
556         /* Read the characters into the buffer */
557         if (likely(atomic_read(&dev->enable_rx))) {
558                 while (count--)
559                         /* Unwrap and destuff one byte */
560                         async_unwrap_char(dev->netdev, &dev->netdev->stats,
561                                           &dev->rx_buff, *cp++);
562         } else {
563                 while (count--) {
564                         /* rx not enabled: save the raw bytes and never
565                          * trigger any netif_rx. The received bytes are flushed
566                          * later when we re-enable rx but might be read meanwhile
567                          * by the dongle driver.
568                          */
569                         dev->rx_buff.data[dev->rx_buff.len++] = *cp++;
570
571                         /* What should we do when the buffer is full? */
572                         if (unlikely(dev->rx_buff.len == dev->rx_buff.truesize))
573                                 dev->rx_buff.len = 0;
574                 }
575         }
576
577         return 0;
578 }
579 EXPORT_SYMBOL(sirdev_receive);
580
581 /**********************************************************************/
582
583 /* callbacks from network layer */
584
585 static netdev_tx_t sirdev_hard_xmit(struct sk_buff *skb,
586                                           struct net_device *ndev)
587 {
588         struct sir_dev *dev = netdev_priv(ndev);
589         unsigned long flags;
590         int actual = 0;
591         int err;
592         s32 speed;
593
594         IRDA_ASSERT(dev != NULL, return NETDEV_TX_OK;);
595
596         netif_stop_queue(ndev);
597
598         IRDA_DEBUG(3, "%s(), skb->len = %d\n", __func__, skb->len);
599
600         speed = irda_get_next_speed(skb);
601         if ((speed != dev->speed) && (speed != -1)) {
602                 if (!skb->len) {
603                         err = sirdev_schedule_speed(dev, speed);
604                         if (unlikely(err == -EWOULDBLOCK)) {
605                                 /* Failed to initiate the speed change, likely the fsm
606                                  * is still busy (pretty unlikely, but...)
607                                  * We refuse to accept the skb and return with the queue
608                                  * stopped so the network layer will retry after the
609                                  * fsm completes and wakes the queue.
610                                  */
611                                  return NETDEV_TX_BUSY;
612                         }
613                         else if (unlikely(err)) {
614                                 /* other fatal error - forget the speed change and
615                                  * hope the stack will recover somehow
616                                  */
617                                  netif_start_queue(ndev);
618                         }
619                         /* else: success
620                          *      speed change in progress now
621                          *      on completion the queue gets restarted
622                          */
623
624                         dev_kfree_skb_any(skb);
625                         return NETDEV_TX_OK;
626                 } else
627                         dev->new_speed = speed;
628         }
629
630         /* Init tx buffer*/
631         dev->tx_buff.data = dev->tx_buff.head;
632
633         /* Check problems */
634         if(spin_is_locked(&dev->tx_lock)) {
635                 IRDA_DEBUG(3, "%s(), write not completed\n", __func__);
636         }
637
638         /* serialize with write completion */
639         spin_lock_irqsave(&dev->tx_lock, flags);
640
641         /* Copy skb to tx_buff while wrapping, stuffing and making CRC */
642         dev->tx_buff.len = async_wrap_skb(skb, dev->tx_buff.data, dev->tx_buff.truesize); 
643
644         /* transmission will start now - disable receive.
645          * if we are just in the middle of an incoming frame,
646          * treat it as collision. probably it's a good idea to
647          * reset the rx_buf OUTSIDE_FRAME in this case too?
648          */
649         atomic_set(&dev->enable_rx, 0);
650         if (unlikely(sirdev_is_receiving(dev)))
651                 dev->netdev->stats.collisions++;
652
653         actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
654
655         if (likely(actual > 0)) {
656                 dev->tx_skb = skb;
657                 ndev->trans_start = jiffies;
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         init_MUTEX(&dev->fsm.sem);
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");