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[deliverable/linux.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->stats.tx_errors++;
459 dev->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->stats.tx_packets++;
497 dev->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->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->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 struct net_device_stats *sirdev_get_stats(struct net_device *ndev)
586 {
587 struct sir_dev *dev = netdev_priv(ndev);
588
589 return (dev) ? &dev->stats : NULL;
590 }
591
592 static int sirdev_hard_xmit(struct sk_buff *skb, struct net_device *ndev)
593 {
594 struct sir_dev *dev = netdev_priv(ndev);
595 unsigned long flags;
596 int actual = 0;
597 int err;
598 s32 speed;
599
600 IRDA_ASSERT(dev != NULL, return 0;);
601
602 netif_stop_queue(ndev);
603
604 IRDA_DEBUG(3, "%s(), skb->len = %d\n", __func__, skb->len);
605
606 speed = irda_get_next_speed(skb);
607 if ((speed != dev->speed) && (speed != -1)) {
608 if (!skb->len) {
609 err = sirdev_schedule_speed(dev, speed);
610 if (unlikely(err == -EWOULDBLOCK)) {
611 /* Failed to initiate the speed change, likely the fsm
612 * is still busy (pretty unlikely, but...)
613 * We refuse to accept the skb and return with the queue
614 * stopped so the network layer will retry after the
615 * fsm completes and wakes the queue.
616 */
617 return 1;
618 }
619 else if (unlikely(err)) {
620 /* other fatal error - forget the speed change and
621 * hope the stack will recover somehow
622 */
623 netif_start_queue(ndev);
624 }
625 /* else: success
626 * speed change in progress now
627 * on completion the queue gets restarted
628 */
629
630 dev_kfree_skb_any(skb);
631 return 0;
632 } else
633 dev->new_speed = speed;
634 }
635
636 /* Init tx buffer*/
637 dev->tx_buff.data = dev->tx_buff.head;
638
639 /* Check problems */
640 if(spin_is_locked(&dev->tx_lock)) {
641 IRDA_DEBUG(3, "%s(), write not completed\n", __func__);
642 }
643
644 /* serialize with write completion */
645 spin_lock_irqsave(&dev->tx_lock, flags);
646
647 /* Copy skb to tx_buff while wrapping, stuffing and making CRC */
648 dev->tx_buff.len = async_wrap_skb(skb, dev->tx_buff.data, dev->tx_buff.truesize);
649
650 /* transmission will start now - disable receive.
651 * if we are just in the middle of an incoming frame,
652 * treat it as collision. probably it's a good idea to
653 * reset the rx_buf OUTSIDE_FRAME in this case too?
654 */
655 atomic_set(&dev->enable_rx, 0);
656 if (unlikely(sirdev_is_receiving(dev)))
657 dev->stats.collisions++;
658
659 actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
660
661 if (likely(actual > 0)) {
662 dev->tx_skb = skb;
663 ndev->trans_start = jiffies;
664 dev->tx_buff.data += actual;
665 dev->tx_buff.len -= actual;
666 }
667 else if (unlikely(actual < 0)) {
668 /* could be dropped later when we have tx_timeout to recover */
669 IRDA_ERROR("%s: drv->do_write failed (%d)\n",
670 __func__, actual);
671 dev_kfree_skb_any(skb);
672 dev->stats.tx_errors++;
673 dev->stats.tx_dropped++;
674 netif_wake_queue(ndev);
675 }
676 spin_unlock_irqrestore(&dev->tx_lock, flags);
677
678 return 0;
679 }
680
681 /* called from network layer with rtnl hold */
682
683 static int sirdev_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
684 {
685 struct if_irda_req *irq = (struct if_irda_req *) rq;
686 struct sir_dev *dev = netdev_priv(ndev);
687 int ret = 0;
688
689 IRDA_ASSERT(dev != NULL, return -1;);
690
691 IRDA_DEBUG(3, "%s(), %s, (cmd=0x%X)\n", __func__, ndev->name, cmd);
692
693 switch (cmd) {
694 case SIOCSBANDWIDTH: /* Set bandwidth */
695 if (!capable(CAP_NET_ADMIN))
696 ret = -EPERM;
697 else
698 ret = sirdev_schedule_speed(dev, irq->ifr_baudrate);
699 /* cannot sleep here for completion
700 * we are called from network layer with rtnl hold
701 */
702 break;
703
704 case SIOCSDONGLE: /* Set dongle */
705 if (!capable(CAP_NET_ADMIN))
706 ret = -EPERM;
707 else
708 ret = sirdev_schedule_dongle_open(dev, irq->ifr_dongle);
709 /* cannot sleep here for completion
710 * we are called from network layer with rtnl hold
711 */
712 break;
713
714 case SIOCSMEDIABUSY: /* Set media busy */
715 if (!capable(CAP_NET_ADMIN))
716 ret = -EPERM;
717 else
718 irda_device_set_media_busy(dev->netdev, TRUE);
719 break;
720
721 case SIOCGRECEIVING: /* Check if we are receiving right now */
722 irq->ifr_receiving = sirdev_is_receiving(dev);
723 break;
724
725 case SIOCSDTRRTS:
726 if (!capable(CAP_NET_ADMIN))
727 ret = -EPERM;
728 else
729 ret = sirdev_schedule_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts);
730 /* cannot sleep here for completion
731 * we are called from network layer with rtnl hold
732 */
733 break;
734
735 case SIOCSMODE:
736 #if 0
737 if (!capable(CAP_NET_ADMIN))
738 ret = -EPERM;
739 else
740 ret = sirdev_schedule_mode(dev, irq->ifr_mode);
741 /* cannot sleep here for completion
742 * we are called from network layer with rtnl hold
743 */
744 break;
745 #endif
746 default:
747 ret = -EOPNOTSUPP;
748 }
749
750 return ret;
751 }
752
753 /* ----------------------------------------------------------------------------- */
754
755 #define SIRBUF_ALLOCSIZE 4269 /* worst case size of a wrapped IrLAP frame */
756
757 static int sirdev_alloc_buffers(struct sir_dev *dev)
758 {
759 dev->tx_buff.truesize = SIRBUF_ALLOCSIZE;
760 dev->rx_buff.truesize = IRDA_SKB_MAX_MTU;
761
762 /* Bootstrap ZeroCopy Rx */
763 dev->rx_buff.skb = __dev_alloc_skb(dev->rx_buff.truesize, GFP_KERNEL);
764 if (dev->rx_buff.skb == NULL)
765 return -ENOMEM;
766 skb_reserve(dev->rx_buff.skb, 1);
767 dev->rx_buff.head = dev->rx_buff.skb->data;
768
769 dev->tx_buff.head = kmalloc(dev->tx_buff.truesize, GFP_KERNEL);
770 if (dev->tx_buff.head == NULL) {
771 kfree_skb(dev->rx_buff.skb);
772 dev->rx_buff.skb = NULL;
773 dev->rx_buff.head = NULL;
774 return -ENOMEM;
775 }
776
777 dev->tx_buff.data = dev->tx_buff.head;
778 dev->rx_buff.data = dev->rx_buff.head;
779 dev->tx_buff.len = 0;
780 dev->rx_buff.len = 0;
781
782 dev->rx_buff.in_frame = FALSE;
783 dev->rx_buff.state = OUTSIDE_FRAME;
784 return 0;
785 };
786
787 static void sirdev_free_buffers(struct sir_dev *dev)
788 {
789 if (dev->rx_buff.skb)
790 kfree_skb(dev->rx_buff.skb);
791 kfree(dev->tx_buff.head);
792 dev->rx_buff.head = dev->tx_buff.head = NULL;
793 dev->rx_buff.skb = NULL;
794 }
795
796 static int sirdev_open(struct net_device *ndev)
797 {
798 struct sir_dev *dev = netdev_priv(ndev);
799 const struct sir_driver *drv = dev->drv;
800
801 if (!drv)
802 return -ENODEV;
803
804 /* increase the reference count of the driver module before doing serious stuff */
805 if (!try_module_get(drv->owner))
806 return -ESTALE;
807
808 IRDA_DEBUG(2, "%s()\n", __func__);
809
810 if (sirdev_alloc_buffers(dev))
811 goto errout_dec;
812
813 if (!dev->drv->start_dev || dev->drv->start_dev(dev))
814 goto errout_free;
815
816 sirdev_enable_rx(dev);
817 dev->raw_tx = 0;
818
819 netif_start_queue(ndev);
820 dev->irlap = irlap_open(ndev, &dev->qos, dev->hwname);
821 if (!dev->irlap)
822 goto errout_stop;
823
824 netif_wake_queue(ndev);
825
826 IRDA_DEBUG(2, "%s - done, speed = %d\n", __func__, dev->speed);
827
828 return 0;
829
830 errout_stop:
831 atomic_set(&dev->enable_rx, 0);
832 if (dev->drv->stop_dev)
833 dev->drv->stop_dev(dev);
834 errout_free:
835 sirdev_free_buffers(dev);
836 errout_dec:
837 module_put(drv->owner);
838 return -EAGAIN;
839 }
840
841 static int sirdev_close(struct net_device *ndev)
842 {
843 struct sir_dev *dev = netdev_priv(ndev);
844 const struct sir_driver *drv;
845
846 // IRDA_DEBUG(0, "%s\n", __func__);
847
848 netif_stop_queue(ndev);
849
850 down(&dev->fsm.sem); /* block on pending config completion */
851
852 atomic_set(&dev->enable_rx, 0);
853
854 if (unlikely(!dev->irlap))
855 goto out;
856 irlap_close(dev->irlap);
857 dev->irlap = NULL;
858
859 drv = dev->drv;
860 if (unlikely(!drv || !dev->priv))
861 goto out;
862
863 if (drv->stop_dev)
864 drv->stop_dev(dev);
865
866 sirdev_free_buffers(dev);
867 module_put(drv->owner);
868
869 out:
870 dev->speed = 0;
871 up(&dev->fsm.sem);
872 return 0;
873 }
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->hard_start_xmit = sirdev_hard_xmit;
919 ndev->open = sirdev_open;
920 ndev->stop = sirdev_close;
921 ndev->get_stats = sirdev_get_stats;
922 ndev->do_ioctl = sirdev_ioctl;
923
924 if (register_netdev(ndev)) {
925 IRDA_ERROR("%s(), register_netdev() failed!\n", __func__);
926 goto out_freenetdev;
927 }
928
929 return dev;
930
931 out_freenetdev:
932 free_netdev(ndev);
933 out:
934 return NULL;
935 }
936 EXPORT_SYMBOL(sirdev_get_instance);
937
938 int sirdev_put_instance(struct sir_dev *dev)
939 {
940 int err = 0;
941
942 IRDA_DEBUG(0, "%s\n", __func__);
943
944 atomic_set(&dev->enable_rx, 0);
945
946 netif_carrier_off(dev->netdev);
947 netif_device_detach(dev->netdev);
948
949 if (dev->dongle_drv)
950 err = sirdev_schedule_dongle_close(dev);
951 if (err)
952 IRDA_ERROR("%s - error %d\n", __func__, err);
953
954 sirdev_close(dev->netdev);
955
956 down(&dev->fsm.sem);
957 dev->fsm.state = SIRDEV_STATE_DEAD; /* mark staled */
958 dev->dongle_drv = NULL;
959 dev->priv = NULL;
960 up(&dev->fsm.sem);
961
962 /* Remove netdevice */
963 unregister_netdev(dev->netdev);
964
965 free_netdev(dev->netdev);
966
967 return 0;
968 }
969 EXPORT_SYMBOL(sirdev_put_instance);
970
971 static int __init sir_wq_init(void)
972 {
973 irda_sir_wq = create_singlethread_workqueue("irda_sir_wq");
974 if (!irda_sir_wq)
975 return -ENOMEM;
976 return 0;
977 }
978
979 static void __exit sir_wq_exit(void)
980 {
981 destroy_workqueue(irda_sir_wq);
982 }
983
984 module_init(sir_wq_init);
985 module_exit(sir_wq_exit);
986
987 MODULE_AUTHOR("Martin Diehl <info@mdiehl.de>");
988 MODULE_DESCRIPTION("IrDA SIR core");
989 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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