ar9170: 40mhz fixes
[linux-2.6] / 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 int sirdev_hard_xmit(struct sk_buff *skb, struct net_device *ndev)
586 {
587         struct sir_dev *dev = netdev_priv(ndev);
588         unsigned long flags;
589         int actual = 0;
590         int err;
591         s32 speed;
592
593         IRDA_ASSERT(dev != NULL, return 0;);
594
595         netif_stop_queue(ndev);
596
597         IRDA_DEBUG(3, "%s(), skb->len = %d\n", __func__, skb->len);
598
599         speed = irda_get_next_speed(skb);
600         if ((speed != dev->speed) && (speed != -1)) {
601                 if (!skb->len) {
602                         err = sirdev_schedule_speed(dev, speed);
603                         if (unlikely(err == -EWOULDBLOCK)) {
604                                 /* Failed to initiate the speed change, likely the fsm
605                                  * is still busy (pretty unlikely, but...)
606                                  * We refuse to accept the skb and return with the queue
607                                  * stopped so the network layer will retry after the
608                                  * fsm completes and wakes the queue.
609                                  */
610                                  return 1;
611                         }
612                         else if (unlikely(err)) {
613                                 /* other fatal error - forget the speed change and
614                                  * hope the stack will recover somehow
615                                  */
616                                  netif_start_queue(ndev);
617                         }
618                         /* else: success
619                          *      speed change in progress now
620                          *      on completion the queue gets restarted
621                          */
622
623                         dev_kfree_skb_any(skb);
624                         return 0;
625                 } else
626                         dev->new_speed = speed;
627         }
628
629         /* Init tx buffer*/
630         dev->tx_buff.data = dev->tx_buff.head;
631
632         /* Check problems */
633         if(spin_is_locked(&dev->tx_lock)) {
634                 IRDA_DEBUG(3, "%s(), write not completed\n", __func__);
635         }
636
637         /* serialize with write completion */
638         spin_lock_irqsave(&dev->tx_lock, flags);
639
640         /* Copy skb to tx_buff while wrapping, stuffing and making CRC */
641         dev->tx_buff.len = async_wrap_skb(skb, dev->tx_buff.data, dev->tx_buff.truesize); 
642
643         /* transmission will start now - disable receive.
644          * if we are just in the middle of an incoming frame,
645          * treat it as collision. probably it's a good idea to
646          * reset the rx_buf OUTSIDE_FRAME in this case too?
647          */
648         atomic_set(&dev->enable_rx, 0);
649         if (unlikely(sirdev_is_receiving(dev)))
650                 dev->netdev->stats.collisions++;
651
652         actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
653
654         if (likely(actual > 0)) {
655                 dev->tx_skb = skb;
656                 ndev->trans_start = jiffies;
657                 dev->tx_buff.data += actual;
658                 dev->tx_buff.len -= actual;
659         }
660         else if (unlikely(actual < 0)) {
661                 /* could be dropped later when we have tx_timeout to recover */
662                 IRDA_ERROR("%s: drv->do_write failed (%d)\n",
663                            __func__, actual);
664                 dev_kfree_skb_any(skb);
665                 dev->netdev->stats.tx_errors++;
666                 dev->netdev->stats.tx_dropped++;
667                 netif_wake_queue(ndev);
668         }
669         spin_unlock_irqrestore(&dev->tx_lock, flags);
670
671         return 0;
672 }
673
674 /* called from network layer with rtnl hold */
675
676 static int sirdev_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
677 {
678         struct if_irda_req *irq = (struct if_irda_req *) rq;
679         struct sir_dev *dev = netdev_priv(ndev);
680         int ret = 0;
681
682         IRDA_ASSERT(dev != NULL, return -1;);
683
684         IRDA_DEBUG(3, "%s(), %s, (cmd=0x%X)\n", __func__, ndev->name, cmd);
685         
686         switch (cmd) {
687         case SIOCSBANDWIDTH: /* Set bandwidth */
688                 if (!capable(CAP_NET_ADMIN))
689                         ret = -EPERM;
690                 else
691                         ret = sirdev_schedule_speed(dev, irq->ifr_baudrate);
692                 /* cannot sleep here for completion
693                  * we are called from network layer with rtnl hold
694                  */
695                 break;
696
697         case SIOCSDONGLE: /* Set dongle */
698                 if (!capable(CAP_NET_ADMIN))
699                         ret = -EPERM;
700                 else
701                         ret = sirdev_schedule_dongle_open(dev, irq->ifr_dongle);
702                 /* cannot sleep here for completion
703                  * we are called from network layer with rtnl hold
704                  */
705                 break;
706
707         case SIOCSMEDIABUSY: /* Set media busy */
708                 if (!capable(CAP_NET_ADMIN))
709                         ret = -EPERM;
710                 else
711                         irda_device_set_media_busy(dev->netdev, TRUE);
712                 break;
713
714         case SIOCGRECEIVING: /* Check if we are receiving right now */
715                 irq->ifr_receiving = sirdev_is_receiving(dev);
716                 break;
717
718         case SIOCSDTRRTS:
719                 if (!capable(CAP_NET_ADMIN))
720                         ret = -EPERM;
721                 else
722                         ret = sirdev_schedule_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts);
723                 /* cannot sleep here for completion
724                  * we are called from network layer with rtnl hold
725                  */
726                 break;
727
728         case SIOCSMODE:
729 #if 0
730                 if (!capable(CAP_NET_ADMIN))
731                         ret = -EPERM;
732                 else
733                         ret = sirdev_schedule_mode(dev, irq->ifr_mode);
734                 /* cannot sleep here for completion
735                  * we are called from network layer with rtnl hold
736                  */
737                 break;
738 #endif
739         default:
740                 ret = -EOPNOTSUPP;
741         }
742         
743         return ret;
744 }
745
746 /* ----------------------------------------------------------------------------- */
747
748 #define SIRBUF_ALLOCSIZE 4269   /* worst case size of a wrapped IrLAP frame */
749
750 static int sirdev_alloc_buffers(struct sir_dev *dev)
751 {
752         dev->tx_buff.truesize = SIRBUF_ALLOCSIZE;
753         dev->rx_buff.truesize = IRDA_SKB_MAX_MTU; 
754
755         /* Bootstrap ZeroCopy Rx */
756         dev->rx_buff.skb = __netdev_alloc_skb(dev->netdev, dev->rx_buff.truesize,
757                                               GFP_KERNEL);
758         if (dev->rx_buff.skb == NULL)
759                 return -ENOMEM;
760         skb_reserve(dev->rx_buff.skb, 1);
761         dev->rx_buff.head = dev->rx_buff.skb->data;
762
763         dev->tx_buff.head = kmalloc(dev->tx_buff.truesize, GFP_KERNEL);
764         if (dev->tx_buff.head == NULL) {
765                 kfree_skb(dev->rx_buff.skb);
766                 dev->rx_buff.skb = NULL;
767                 dev->rx_buff.head = NULL;
768                 return -ENOMEM;
769         }
770
771         dev->tx_buff.data = dev->tx_buff.head;
772         dev->rx_buff.data = dev->rx_buff.head;
773         dev->tx_buff.len = 0;
774         dev->rx_buff.len = 0;
775
776         dev->rx_buff.in_frame = FALSE;
777         dev->rx_buff.state = OUTSIDE_FRAME;
778         return 0;
779 };
780
781 static void sirdev_free_buffers(struct sir_dev *dev)
782 {
783         kfree_skb(dev->rx_buff.skb);
784         kfree(dev->tx_buff.head);
785         dev->rx_buff.head = dev->tx_buff.head = NULL;
786         dev->rx_buff.skb = NULL;
787 }
788
789 static int sirdev_open(struct net_device *ndev)
790 {
791         struct sir_dev *dev = netdev_priv(ndev);
792         const struct sir_driver *drv = dev->drv;
793
794         if (!drv)
795                 return -ENODEV;
796
797         /* increase the reference count of the driver module before doing serious stuff */
798         if (!try_module_get(drv->owner))
799                 return -ESTALE;
800
801         IRDA_DEBUG(2, "%s()\n", __func__);
802
803         if (sirdev_alloc_buffers(dev))
804                 goto errout_dec;
805
806         if (!dev->drv->start_dev  ||  dev->drv->start_dev(dev))
807                 goto errout_free;
808
809         sirdev_enable_rx(dev);
810         dev->raw_tx = 0;
811
812         netif_start_queue(ndev);
813         dev->irlap = irlap_open(ndev, &dev->qos, dev->hwname);
814         if (!dev->irlap)
815                 goto errout_stop;
816
817         netif_wake_queue(ndev);
818
819         IRDA_DEBUG(2, "%s - done, speed = %d\n", __func__, dev->speed);
820
821         return 0;
822
823 errout_stop:
824         atomic_set(&dev->enable_rx, 0);
825         if (dev->drv->stop_dev)
826                 dev->drv->stop_dev(dev);
827 errout_free:
828         sirdev_free_buffers(dev);
829 errout_dec:
830         module_put(drv->owner);
831         return -EAGAIN;
832 }
833
834 static int sirdev_close(struct net_device *ndev)
835 {
836         struct sir_dev *dev = netdev_priv(ndev);
837         const struct sir_driver *drv;
838
839 //      IRDA_DEBUG(0, "%s\n", __func__);
840
841         netif_stop_queue(ndev);
842
843         down(&dev->fsm.sem);            /* block on pending config completion */
844
845         atomic_set(&dev->enable_rx, 0);
846
847         if (unlikely(!dev->irlap))
848                 goto out;
849         irlap_close(dev->irlap);
850         dev->irlap = NULL;
851
852         drv = dev->drv;
853         if (unlikely(!drv  ||  !dev->priv))
854                 goto out;
855
856         if (drv->stop_dev)
857                 drv->stop_dev(dev);
858
859         sirdev_free_buffers(dev);
860         module_put(drv->owner);
861
862 out:
863         dev->speed = 0;
864         up(&dev->fsm.sem);
865         return 0;
866 }
867
868 static const struct net_device_ops sirdev_ops = {
869         .ndo_start_xmit = sirdev_hard_xmit,
870         .ndo_open       = sirdev_open,
871         .ndo_stop       = sirdev_close,
872         .ndo_do_ioctl   = sirdev_ioctl,
873 };
874 /* ----------------------------------------------------------------------------- */
875
876 struct sir_dev * sirdev_get_instance(const struct sir_driver *drv, const char *name)
877 {
878         struct net_device *ndev;
879         struct sir_dev *dev;
880
881         IRDA_DEBUG(0, "%s - %s\n", __func__, name);
882
883         /* instead of adding tests to protect against drv->do_write==NULL
884          * at several places we refuse to create a sir_dev instance for
885          * drivers which don't implement do_write.
886          */
887         if (!drv ||  !drv->do_write)
888                 return NULL;
889
890         /*
891          *  Allocate new instance of the device
892          */
893         ndev = alloc_irdadev(sizeof(*dev));
894         if (ndev == NULL) {
895                 IRDA_ERROR("%s - Can't allocate memory for IrDA control block!\n", __func__);
896                 goto out;
897         }
898         dev = netdev_priv(ndev);
899
900         irda_init_max_qos_capabilies(&dev->qos);
901         dev->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
902         dev->qos.min_turn_time.bits = drv->qos_mtt_bits;
903         irda_qos_bits_to_value(&dev->qos);
904
905         strncpy(dev->hwname, name, sizeof(dev->hwname)-1);
906
907         atomic_set(&dev->enable_rx, 0);
908         dev->tx_skb = NULL;
909
910         spin_lock_init(&dev->tx_lock);
911         init_MUTEX(&dev->fsm.sem);
912
913         dev->drv = drv;
914         dev->netdev = ndev;
915
916         /* Override the network functions we need to use */
917         ndev->netdev_ops = &sirdev_ops;
918
919         if (register_netdev(ndev)) {
920                 IRDA_ERROR("%s(), register_netdev() failed!\n", __func__);
921                 goto out_freenetdev;
922         }
923
924         return dev;
925
926 out_freenetdev:
927         free_netdev(ndev);
928 out:
929         return NULL;
930 }
931 EXPORT_SYMBOL(sirdev_get_instance);
932
933 int sirdev_put_instance(struct sir_dev *dev)
934 {
935         int err = 0;
936
937         IRDA_DEBUG(0, "%s\n", __func__);
938
939         atomic_set(&dev->enable_rx, 0);
940
941         netif_carrier_off(dev->netdev);
942         netif_device_detach(dev->netdev);
943
944         if (dev->dongle_drv)
945                 err = sirdev_schedule_dongle_close(dev);
946         if (err)
947                 IRDA_ERROR("%s - error %d\n", __func__, err);
948
949         sirdev_close(dev->netdev);
950
951         down(&dev->fsm.sem);
952         dev->fsm.state = SIRDEV_STATE_DEAD;     /* mark staled */
953         dev->dongle_drv = NULL;
954         dev->priv = NULL;
955         up(&dev->fsm.sem);
956
957         /* Remove netdevice */
958         unregister_netdev(dev->netdev);
959
960         free_netdev(dev->netdev);
961
962         return 0;
963 }
964 EXPORT_SYMBOL(sirdev_put_instance);
965
966 static int __init sir_wq_init(void)
967 {
968         irda_sir_wq = create_singlethread_workqueue("irda_sir_wq");
969         if (!irda_sir_wq)
970                 return -ENOMEM;
971         return 0;
972 }
973
974 static void __exit sir_wq_exit(void)
975 {
976         destroy_workqueue(irda_sir_wq);
977 }
978
979 module_init(sir_wq_init);
980 module_exit(sir_wq_exit);
981
982 MODULE_AUTHOR("Martin Diehl <info@mdiehl.de>");
983 MODULE_DESCRIPTION("IrDA SIR core");
984 MODULE_LICENSE("GPL");