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1da177e4 LT |
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/smp_lock.h> | |
18 | #include <linux/delay.h> | |
19 | ||
20 | #include <net/irda/irda.h> | |
21 | #include <net/irda/wrapper.h> | |
22 | #include <net/irda/irda_device.h> | |
23 | ||
24 | #include "sir-dev.h" | |
25 | ||
26 | /***************************************************************************/ | |
27 | ||
28 | void sirdev_enable_rx(struct sir_dev *dev) | |
29 | { | |
30 | if (unlikely(atomic_read(&dev->enable_rx))) | |
31 | return; | |
32 | ||
33 | /* flush rx-buffer - should also help in case of problems with echo cancelation */ | |
34 | dev->rx_buff.data = dev->rx_buff.head; | |
35 | dev->rx_buff.len = 0; | |
36 | dev->rx_buff.in_frame = FALSE; | |
37 | dev->rx_buff.state = OUTSIDE_FRAME; | |
38 | atomic_set(&dev->enable_rx, 1); | |
39 | } | |
40 | ||
41 | static int sirdev_is_receiving(struct sir_dev *dev) | |
42 | { | |
43 | if (!atomic_read(&dev->enable_rx)) | |
44 | return 0; | |
45 | ||
46 | return (dev->rx_buff.state != OUTSIDE_FRAME); | |
47 | } | |
48 | ||
49 | int sirdev_set_dongle(struct sir_dev *dev, IRDA_DONGLE type) | |
50 | { | |
51 | int err; | |
52 | ||
53 | IRDA_DEBUG(3, "%s : requesting dongle %d.\n", __FUNCTION__, type); | |
54 | ||
55 | err = sirdev_schedule_dongle_open(dev, type); | |
56 | if (unlikely(err)) | |
57 | return err; | |
58 | down(&dev->fsm.sem); /* block until config change completed */ | |
59 | err = dev->fsm.result; | |
60 | up(&dev->fsm.sem); | |
61 | return err; | |
62 | } | |
63 | ||
64 | /* used by dongle drivers for dongle programming */ | |
65 | ||
66 | int sirdev_raw_write(struct sir_dev *dev, const char *buf, int len) | |
67 | { | |
68 | unsigned long flags; | |
69 | int ret; | |
70 | ||
71 | if (unlikely(len > dev->tx_buff.truesize)) | |
72 | return -ENOSPC; | |
73 | ||
74 | spin_lock_irqsave(&dev->tx_lock, flags); /* serialize with other tx operations */ | |
75 | while (dev->tx_buff.len > 0) { /* wait until tx idle */ | |
76 | spin_unlock_irqrestore(&dev->tx_lock, flags); | |
77 | msleep(10); | |
78 | spin_lock_irqsave(&dev->tx_lock, flags); | |
79 | } | |
80 | ||
81 | dev->tx_buff.data = dev->tx_buff.head; | |
82 | memcpy(dev->tx_buff.data, buf, len); | |
83 | dev->tx_buff.len = len; | |
84 | ||
85 | ret = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len); | |
86 | if (ret > 0) { | |
87 | IRDA_DEBUG(3, "%s(), raw-tx started\n", __FUNCTION__); | |
88 | ||
89 | dev->tx_buff.data += ret; | |
90 | dev->tx_buff.len -= ret; | |
91 | dev->raw_tx = 1; | |
92 | ret = len; /* all data is going to be sent */ | |
93 | } | |
94 | spin_unlock_irqrestore(&dev->tx_lock, flags); | |
95 | return ret; | |
96 | } | |
97 | ||
98 | /* seems some dongle drivers may need this */ | |
99 | ||
100 | int sirdev_raw_read(struct sir_dev *dev, char *buf, int len) | |
101 | { | |
102 | int count; | |
103 | ||
104 | if (atomic_read(&dev->enable_rx)) | |
105 | return -EIO; /* fail if we expect irda-frames */ | |
106 | ||
107 | count = (len < dev->rx_buff.len) ? len : dev->rx_buff.len; | |
108 | ||
109 | if (count > 0) { | |
110 | memcpy(buf, dev->rx_buff.data, count); | |
111 | dev->rx_buff.data += count; | |
112 | dev->rx_buff.len -= count; | |
113 | } | |
114 | ||
115 | /* remaining stuff gets flushed when re-enabling normal rx */ | |
116 | ||
117 | return count; | |
118 | } | |
119 | ||
120 | int sirdev_set_dtr_rts(struct sir_dev *dev, int dtr, int rts) | |
121 | { | |
122 | int ret = -ENXIO; | |
123 | if (dev->drv->set_dtr_rts != 0) | |
124 | ret = dev->drv->set_dtr_rts(dev, dtr, rts); | |
125 | return ret; | |
126 | } | |
127 | ||
128 | /**********************************************************************/ | |
129 | ||
130 | /* called from client driver - likely with bh-context - to indicate | |
131 | * it made some progress with transmission. Hence we send the next | |
132 | * chunk, if any, or complete the skb otherwise | |
133 | */ | |
134 | ||
135 | void sirdev_write_complete(struct sir_dev *dev) | |
136 | { | |
137 | unsigned long flags; | |
138 | struct sk_buff *skb; | |
139 | int actual = 0; | |
140 | int err; | |
141 | ||
142 | spin_lock_irqsave(&dev->tx_lock, flags); | |
143 | ||
144 | IRDA_DEBUG(3, "%s() - dev->tx_buff.len = %d\n", | |
145 | __FUNCTION__, dev->tx_buff.len); | |
146 | ||
147 | if (likely(dev->tx_buff.len > 0)) { | |
148 | /* Write data left in transmit buffer */ | |
149 | actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len); | |
150 | ||
151 | if (likely(actual>0)) { | |
152 | dev->tx_buff.data += actual; | |
153 | dev->tx_buff.len -= actual; | |
154 | } | |
155 | else if (unlikely(actual<0)) { | |
156 | /* could be dropped later when we have tx_timeout to recover */ | |
157 | IRDA_ERROR("%s: drv->do_write failed (%d)\n", | |
158 | __FUNCTION__, actual); | |
159 | if ((skb=dev->tx_skb) != NULL) { | |
160 | dev->tx_skb = NULL; | |
161 | dev_kfree_skb_any(skb); | |
162 | dev->stats.tx_errors++; | |
163 | dev->stats.tx_dropped++; | |
164 | } | |
165 | dev->tx_buff.len = 0; | |
166 | } | |
167 | if (dev->tx_buff.len > 0) | |
168 | goto done; /* more data to send later */ | |
169 | } | |
170 | ||
171 | if (unlikely(dev->raw_tx != 0)) { | |
172 | /* in raw mode we are just done now after the buffer was sent | |
173 | * completely. Since this was requested by some dongle driver | |
174 | * running under the control of the irda-thread we must take | |
175 | * care here not to re-enable the queue. The queue will be | |
176 | * restarted when the irda-thread has completed the request. | |
177 | */ | |
178 | ||
179 | IRDA_DEBUG(3, "%s(), raw-tx done\n", __FUNCTION__); | |
180 | dev->raw_tx = 0; | |
181 | goto done; /* no post-frame handling in raw mode */ | |
182 | } | |
183 | ||
184 | /* we have finished now sending this skb. | |
185 | * update statistics and free the skb. | |
186 | * finally we check and trigger a pending speed change, if any. | |
187 | * if not we switch to rx mode and wake the queue for further | |
188 | * packets. | |
189 | * note the scheduled speed request blocks until the lower | |
190 | * client driver and the corresponding hardware has really | |
191 | * finished sending all data (xmit fifo drained f.e.) | |
192 | * before the speed change gets finally done and the queue | |
193 | * re-activated. | |
194 | */ | |
195 | ||
196 | IRDA_DEBUG(5, "%s(), finished with frame!\n", __FUNCTION__); | |
197 | ||
198 | if ((skb=dev->tx_skb) != NULL) { | |
199 | dev->tx_skb = NULL; | |
200 | dev->stats.tx_packets++; | |
201 | dev->stats.tx_bytes += skb->len; | |
202 | dev_kfree_skb_any(skb); | |
203 | } | |
204 | ||
205 | if (unlikely(dev->new_speed > 0)) { | |
206 | IRDA_DEBUG(5, "%s(), Changing speed!\n", __FUNCTION__); | |
207 | err = sirdev_schedule_speed(dev, dev->new_speed); | |
208 | if (unlikely(err)) { | |
209 | /* should never happen | |
210 | * forget the speed change and hope the stack recovers | |
211 | */ | |
212 | IRDA_ERROR("%s - schedule speed change failed: %d\n", | |
213 | __FUNCTION__, err); | |
214 | netif_wake_queue(dev->netdev); | |
215 | } | |
216 | /* else: success | |
217 | * speed change in progress now | |
218 | * on completion dev->new_speed gets cleared, | |
219 | * rx-reenabled and the queue restarted | |
220 | */ | |
221 | } | |
222 | else { | |
223 | sirdev_enable_rx(dev); | |
224 | netif_wake_queue(dev->netdev); | |
225 | } | |
226 | ||
227 | done: | |
228 | spin_unlock_irqrestore(&dev->tx_lock, flags); | |
229 | } | |
230 | ||
231 | /* called from client driver - likely with bh-context - to give us | |
232 | * some more received bytes. We put them into the rx-buffer, | |
233 | * normally unwrapping and building LAP-skb's (unless rx disabled) | |
234 | */ | |
235 | ||
236 | int sirdev_receive(struct sir_dev *dev, const unsigned char *cp, size_t count) | |
237 | { | |
238 | if (!dev || !dev->netdev) { | |
239 | IRDA_WARNING("%s(), not ready yet!\n", __FUNCTION__); | |
240 | return -1; | |
241 | } | |
242 | ||
243 | if (!dev->irlap) { | |
244 | IRDA_WARNING("%s - too early: %p / %zd!\n", | |
245 | __FUNCTION__, cp, count); | |
246 | return -1; | |
247 | } | |
248 | ||
249 | if (cp==NULL) { | |
250 | /* error already at lower level receive | |
251 | * just update stats and set media busy | |
252 | */ | |
253 | irda_device_set_media_busy(dev->netdev, TRUE); | |
254 | dev->stats.rx_dropped++; | |
255 | IRDA_DEBUG(0, "%s; rx-drop: %zd\n", __FUNCTION__, count); | |
256 | return 0; | |
257 | } | |
258 | ||
259 | /* Read the characters into the buffer */ | |
260 | if (likely(atomic_read(&dev->enable_rx))) { | |
261 | while (count--) | |
262 | /* Unwrap and destuff one byte */ | |
263 | async_unwrap_char(dev->netdev, &dev->stats, | |
264 | &dev->rx_buff, *cp++); | |
265 | } else { | |
266 | while (count--) { | |
267 | /* rx not enabled: save the raw bytes and never | |
268 | * trigger any netif_rx. The received bytes are flushed | |
269 | * later when we re-enable rx but might be read meanwhile | |
270 | * by the dongle driver. | |
271 | */ | |
272 | dev->rx_buff.data[dev->rx_buff.len++] = *cp++; | |
273 | ||
274 | /* What should we do when the buffer is full? */ | |
275 | if (unlikely(dev->rx_buff.len == dev->rx_buff.truesize)) | |
276 | dev->rx_buff.len = 0; | |
277 | } | |
278 | } | |
279 | ||
280 | return 0; | |
281 | } | |
282 | ||
283 | /**********************************************************************/ | |
284 | ||
285 | /* callbacks from network layer */ | |
286 | ||
287 | static struct net_device_stats *sirdev_get_stats(struct net_device *ndev) | |
288 | { | |
289 | struct sir_dev *dev = ndev->priv; | |
290 | ||
291 | return (dev) ? &dev->stats : NULL; | |
292 | } | |
293 | ||
294 | static int sirdev_hard_xmit(struct sk_buff *skb, struct net_device *ndev) | |
295 | { | |
296 | struct sir_dev *dev = ndev->priv; | |
297 | unsigned long flags; | |
298 | int actual = 0; | |
299 | int err; | |
300 | s32 speed; | |
301 | ||
302 | IRDA_ASSERT(dev != NULL, return 0;); | |
303 | ||
304 | netif_stop_queue(ndev); | |
305 | ||
306 | IRDA_DEBUG(3, "%s(), skb->len = %d\n", __FUNCTION__, skb->len); | |
307 | ||
308 | speed = irda_get_next_speed(skb); | |
309 | if ((speed != dev->speed) && (speed != -1)) { | |
310 | if (!skb->len) { | |
311 | err = sirdev_schedule_speed(dev, speed); | |
312 | if (unlikely(err == -EWOULDBLOCK)) { | |
313 | /* Failed to initiate the speed change, likely the fsm | |
314 | * is still busy (pretty unlikely, but...) | |
315 | * We refuse to accept the skb and return with the queue | |
316 | * stopped so the network layer will retry after the | |
317 | * fsm completes and wakes the queue. | |
318 | */ | |
319 | return 1; | |
320 | } | |
321 | else if (unlikely(err)) { | |
322 | /* other fatal error - forget the speed change and | |
323 | * hope the stack will recover somehow | |
324 | */ | |
325 | netif_start_queue(ndev); | |
326 | } | |
327 | /* else: success | |
328 | * speed change in progress now | |
329 | * on completion the queue gets restarted | |
330 | */ | |
331 | ||
332 | dev_kfree_skb_any(skb); | |
333 | return 0; | |
334 | } else | |
335 | dev->new_speed = speed; | |
336 | } | |
337 | ||
338 | /* Init tx buffer*/ | |
339 | dev->tx_buff.data = dev->tx_buff.head; | |
340 | ||
341 | /* Check problems */ | |
342 | if(spin_is_locked(&dev->tx_lock)) { | |
343 | IRDA_DEBUG(3, "%s(), write not completed\n", __FUNCTION__); | |
344 | } | |
345 | ||
346 | /* serialize with write completion */ | |
347 | spin_lock_irqsave(&dev->tx_lock, flags); | |
348 | ||
349 | /* Copy skb to tx_buff while wrapping, stuffing and making CRC */ | |
350 | dev->tx_buff.len = async_wrap_skb(skb, dev->tx_buff.data, dev->tx_buff.truesize); | |
351 | ||
352 | /* transmission will start now - disable receive. | |
353 | * if we are just in the middle of an incoming frame, | |
354 | * treat it as collision. probably it's a good idea to | |
355 | * reset the rx_buf OUTSIDE_FRAME in this case too? | |
356 | */ | |
357 | atomic_set(&dev->enable_rx, 0); | |
358 | if (unlikely(sirdev_is_receiving(dev))) | |
359 | dev->stats.collisions++; | |
360 | ||
361 | actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len); | |
362 | ||
363 | if (likely(actual > 0)) { | |
364 | dev->tx_skb = skb; | |
365 | ndev->trans_start = jiffies; | |
366 | dev->tx_buff.data += actual; | |
367 | dev->tx_buff.len -= actual; | |
368 | } | |
369 | else if (unlikely(actual < 0)) { | |
370 | /* could be dropped later when we have tx_timeout to recover */ | |
371 | IRDA_ERROR("%s: drv->do_write failed (%d)\n", | |
372 | __FUNCTION__, actual); | |
373 | dev_kfree_skb_any(skb); | |
374 | dev->stats.tx_errors++; | |
375 | dev->stats.tx_dropped++; | |
376 | netif_wake_queue(ndev); | |
377 | } | |
378 | spin_unlock_irqrestore(&dev->tx_lock, flags); | |
379 | ||
380 | return 0; | |
381 | } | |
382 | ||
383 | /* called from network layer with rtnl hold */ | |
384 | ||
385 | static int sirdev_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd) | |
386 | { | |
387 | struct if_irda_req *irq = (struct if_irda_req *) rq; | |
388 | struct sir_dev *dev = ndev->priv; | |
389 | int ret = 0; | |
390 | ||
391 | IRDA_ASSERT(dev != NULL, return -1;); | |
392 | ||
393 | IRDA_DEBUG(3, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, ndev->name, cmd); | |
394 | ||
395 | switch (cmd) { | |
396 | case SIOCSBANDWIDTH: /* Set bandwidth */ | |
397 | if (!capable(CAP_NET_ADMIN)) | |
398 | ret = -EPERM; | |
399 | else | |
400 | ret = sirdev_schedule_speed(dev, irq->ifr_baudrate); | |
401 | /* cannot sleep here for completion | |
402 | * we are called from network layer with rtnl hold | |
403 | */ | |
404 | break; | |
405 | ||
406 | case SIOCSDONGLE: /* Set dongle */ | |
407 | if (!capable(CAP_NET_ADMIN)) | |
408 | ret = -EPERM; | |
409 | else | |
410 | ret = sirdev_schedule_dongle_open(dev, irq->ifr_dongle); | |
411 | /* cannot sleep here for completion | |
412 | * we are called from network layer with rtnl hold | |
413 | */ | |
414 | break; | |
415 | ||
416 | case SIOCSMEDIABUSY: /* Set media busy */ | |
417 | if (!capable(CAP_NET_ADMIN)) | |
418 | ret = -EPERM; | |
419 | else | |
420 | irda_device_set_media_busy(dev->netdev, TRUE); | |
421 | break; | |
422 | ||
423 | case SIOCGRECEIVING: /* Check if we are receiving right now */ | |
424 | irq->ifr_receiving = sirdev_is_receiving(dev); | |
425 | break; | |
426 | ||
427 | case SIOCSDTRRTS: | |
428 | if (!capable(CAP_NET_ADMIN)) | |
429 | ret = -EPERM; | |
430 | else | |
431 | ret = sirdev_schedule_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts); | |
432 | /* cannot sleep here for completion | |
433 | * we are called from network layer with rtnl hold | |
434 | */ | |
435 | break; | |
436 | ||
437 | case SIOCSMODE: | |
438 | #if 0 | |
439 | if (!capable(CAP_NET_ADMIN)) | |
440 | ret = -EPERM; | |
441 | else | |
442 | ret = sirdev_schedule_mode(dev, irq->ifr_mode); | |
443 | /* cannot sleep here for completion | |
444 | * we are called from network layer with rtnl hold | |
445 | */ | |
446 | break; | |
447 | #endif | |
448 | default: | |
449 | ret = -EOPNOTSUPP; | |
450 | } | |
451 | ||
452 | return ret; | |
453 | } | |
454 | ||
455 | /* ----------------------------------------------------------------------------- */ | |
456 | ||
457 | #define SIRBUF_ALLOCSIZE 4269 /* worst case size of a wrapped IrLAP frame */ | |
458 | ||
459 | static int sirdev_alloc_buffers(struct sir_dev *dev) | |
460 | { | |
461 | dev->tx_buff.truesize = SIRBUF_ALLOCSIZE; | |
462 | dev->rx_buff.truesize = IRDA_SKB_MAX_MTU; | |
463 | ||
464 | /* Bootstrap ZeroCopy Rx */ | |
465 | dev->rx_buff.skb = __dev_alloc_skb(dev->rx_buff.truesize, GFP_KERNEL); | |
466 | if (dev->rx_buff.skb == NULL) | |
467 | return -ENOMEM; | |
468 | skb_reserve(dev->rx_buff.skb, 1); | |
469 | dev->rx_buff.head = dev->rx_buff.skb->data; | |
470 | ||
471 | dev->tx_buff.head = kmalloc(dev->tx_buff.truesize, GFP_KERNEL); | |
472 | if (dev->tx_buff.head == NULL) { | |
473 | kfree_skb(dev->rx_buff.skb); | |
474 | dev->rx_buff.skb = NULL; | |
475 | dev->rx_buff.head = NULL; | |
476 | return -ENOMEM; | |
477 | } | |
478 | ||
479 | dev->tx_buff.data = dev->tx_buff.head; | |
480 | dev->rx_buff.data = dev->rx_buff.head; | |
481 | dev->tx_buff.len = 0; | |
482 | dev->rx_buff.len = 0; | |
483 | ||
484 | dev->rx_buff.in_frame = FALSE; | |
485 | dev->rx_buff.state = OUTSIDE_FRAME; | |
486 | return 0; | |
487 | }; | |
488 | ||
489 | static void sirdev_free_buffers(struct sir_dev *dev) | |
490 | { | |
491 | if (dev->rx_buff.skb) | |
492 | kfree_skb(dev->rx_buff.skb); | |
b4558ea9 | 493 | kfree(dev->tx_buff.head); |
1da177e4 LT |
494 | dev->rx_buff.head = dev->tx_buff.head = NULL; |
495 | dev->rx_buff.skb = NULL; | |
496 | } | |
497 | ||
498 | static int sirdev_open(struct net_device *ndev) | |
499 | { | |
500 | struct sir_dev *dev = ndev->priv; | |
501 | const struct sir_driver *drv = dev->drv; | |
502 | ||
503 | if (!drv) | |
504 | return -ENODEV; | |
505 | ||
506 | /* increase the reference count of the driver module before doing serious stuff */ | |
507 | if (!try_module_get(drv->owner)) | |
508 | return -ESTALE; | |
509 | ||
510 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__); | |
511 | ||
512 | if (sirdev_alloc_buffers(dev)) | |
513 | goto errout_dec; | |
514 | ||
515 | if (!dev->drv->start_dev || dev->drv->start_dev(dev)) | |
516 | goto errout_free; | |
517 | ||
518 | sirdev_enable_rx(dev); | |
519 | dev->raw_tx = 0; | |
520 | ||
521 | netif_start_queue(ndev); | |
522 | dev->irlap = irlap_open(ndev, &dev->qos, dev->hwname); | |
523 | if (!dev->irlap) | |
524 | goto errout_stop; | |
525 | ||
526 | netif_wake_queue(ndev); | |
527 | ||
528 | IRDA_DEBUG(2, "%s - done, speed = %d\n", __FUNCTION__, dev->speed); | |
529 | ||
530 | return 0; | |
531 | ||
532 | errout_stop: | |
533 | atomic_set(&dev->enable_rx, 0); | |
534 | if (dev->drv->stop_dev) | |
535 | dev->drv->stop_dev(dev); | |
536 | errout_free: | |
537 | sirdev_free_buffers(dev); | |
538 | errout_dec: | |
539 | module_put(drv->owner); | |
540 | return -EAGAIN; | |
541 | } | |
542 | ||
543 | static int sirdev_close(struct net_device *ndev) | |
544 | { | |
545 | struct sir_dev *dev = ndev->priv; | |
546 | const struct sir_driver *drv; | |
547 | ||
548 | // IRDA_DEBUG(0, "%s\n", __FUNCTION__); | |
549 | ||
550 | netif_stop_queue(ndev); | |
551 | ||
552 | down(&dev->fsm.sem); /* block on pending config completion */ | |
553 | ||
554 | atomic_set(&dev->enable_rx, 0); | |
555 | ||
556 | if (unlikely(!dev->irlap)) | |
557 | goto out; | |
558 | irlap_close(dev->irlap); | |
559 | dev->irlap = NULL; | |
560 | ||
561 | drv = dev->drv; | |
562 | if (unlikely(!drv || !dev->priv)) | |
563 | goto out; | |
564 | ||
565 | if (drv->stop_dev) | |
566 | drv->stop_dev(dev); | |
567 | ||
568 | sirdev_free_buffers(dev); | |
569 | module_put(drv->owner); | |
570 | ||
571 | out: | |
572 | dev->speed = 0; | |
573 | up(&dev->fsm.sem); | |
574 | return 0; | |
575 | } | |
576 | ||
577 | /* ----------------------------------------------------------------------------- */ | |
578 | ||
579 | struct sir_dev * sirdev_get_instance(const struct sir_driver *drv, const char *name) | |
580 | { | |
581 | struct net_device *ndev; | |
582 | struct sir_dev *dev; | |
583 | ||
584 | IRDA_DEBUG(0, "%s - %s\n", __FUNCTION__, name); | |
585 | ||
586 | /* instead of adding tests to protect against drv->do_write==NULL | |
587 | * at several places we refuse to create a sir_dev instance for | |
588 | * drivers which don't implement do_write. | |
589 | */ | |
590 | if (!drv || !drv->do_write) | |
591 | return NULL; | |
592 | ||
593 | /* | |
594 | * Allocate new instance of the device | |
595 | */ | |
596 | ndev = alloc_irdadev(sizeof(*dev)); | |
597 | if (ndev == NULL) { | |
598 | IRDA_ERROR("%s - Can't allocate memory for IrDA control block!\n", __FUNCTION__); | |
599 | goto out; | |
600 | } | |
601 | dev = ndev->priv; | |
602 | ||
603 | irda_init_max_qos_capabilies(&dev->qos); | |
604 | dev->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|IR_115200; | |
605 | dev->qos.min_turn_time.bits = drv->qos_mtt_bits; | |
606 | irda_qos_bits_to_value(&dev->qos); | |
607 | ||
608 | strncpy(dev->hwname, name, sizeof(dev->hwname)-1); | |
609 | ||
610 | atomic_set(&dev->enable_rx, 0); | |
611 | dev->tx_skb = NULL; | |
612 | ||
613 | spin_lock_init(&dev->tx_lock); | |
614 | init_MUTEX(&dev->fsm.sem); | |
615 | ||
616 | INIT_LIST_HEAD(&dev->fsm.rq.lh_request); | |
617 | dev->fsm.rq.pending = 0; | |
618 | init_timer(&dev->fsm.rq.timer); | |
619 | ||
620 | dev->drv = drv; | |
621 | dev->netdev = ndev; | |
622 | ||
623 | SET_MODULE_OWNER(ndev); | |
624 | ||
625 | /* Override the network functions we need to use */ | |
626 | ndev->hard_start_xmit = sirdev_hard_xmit; | |
627 | ndev->open = sirdev_open; | |
628 | ndev->stop = sirdev_close; | |
629 | ndev->get_stats = sirdev_get_stats; | |
630 | ndev->do_ioctl = sirdev_ioctl; | |
631 | ||
632 | if (register_netdev(ndev)) { | |
633 | IRDA_ERROR("%s(), register_netdev() failed!\n", __FUNCTION__); | |
634 | goto out_freenetdev; | |
635 | } | |
636 | ||
637 | return dev; | |
638 | ||
639 | out_freenetdev: | |
640 | free_netdev(ndev); | |
641 | out: | |
642 | return NULL; | |
643 | } | |
644 | ||
645 | int sirdev_put_instance(struct sir_dev *dev) | |
646 | { | |
647 | int err = 0; | |
648 | ||
649 | IRDA_DEBUG(0, "%s\n", __FUNCTION__); | |
650 | ||
651 | atomic_set(&dev->enable_rx, 0); | |
652 | ||
653 | netif_carrier_off(dev->netdev); | |
654 | netif_device_detach(dev->netdev); | |
655 | ||
656 | if (dev->dongle_drv) | |
657 | err = sirdev_schedule_dongle_close(dev); | |
658 | if (err) | |
659 | IRDA_ERROR("%s - error %d\n", __FUNCTION__, err); | |
660 | ||
661 | sirdev_close(dev->netdev); | |
662 | ||
663 | down(&dev->fsm.sem); | |
664 | dev->fsm.state = SIRDEV_STATE_DEAD; /* mark staled */ | |
665 | dev->dongle_drv = NULL; | |
666 | dev->priv = NULL; | |
667 | up(&dev->fsm.sem); | |
668 | ||
669 | /* Remove netdevice */ | |
670 | unregister_netdev(dev->netdev); | |
671 | ||
672 | free_netdev(dev->netdev); | |
673 | ||
674 | return 0; | |
675 | } | |
676 |