Commit | Line | Data |
---|---|---|
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 | ||
a6b7a407 | 14 | #include <linux/hardirq.h> |
1da177e4 LT |
15 | #include <linux/module.h> |
16 | #include <linux/kernel.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
1da177e4 | 18 | #include <linux/init.h> |
1da177e4 LT |
19 | #include <linux/delay.h> |
20 | ||
21 | #include <net/irda/irda.h> | |
22 | #include <net/irda/wrapper.h> | |
23 | #include <net/irda/irda_device.h> | |
24 | ||
25 | #include "sir-dev.h" | |
26 | ||
788252e6 CH |
27 | |
28 | static struct workqueue_struct *irda_sir_wq; | |
29 | ||
30 | /* STATE MACHINE */ | |
31 | ||
32 | /* substate handler of the config-fsm to handle the cases where we want | |
33 | * to wait for transmit completion before changing the port configuration | |
34 | */ | |
35 | ||
36 | static int sirdev_tx_complete_fsm(struct sir_dev *dev) | |
37 | { | |
38 | struct sir_fsm *fsm = &dev->fsm; | |
39 | unsigned next_state, delay; | |
40 | unsigned bytes_left; | |
41 | ||
42 | do { | |
43 | next_state = fsm->substate; /* default: stay in current substate */ | |
44 | delay = 0; | |
45 | ||
46 | switch(fsm->substate) { | |
47 | ||
48 | case SIRDEV_STATE_WAIT_XMIT: | |
49 | if (dev->drv->chars_in_buffer) | |
50 | bytes_left = dev->drv->chars_in_buffer(dev); | |
51 | else | |
52 | bytes_left = 0; | |
53 | if (!bytes_left) { | |
54 | next_state = SIRDEV_STATE_WAIT_UNTIL_SENT; | |
55 | break; | |
56 | } | |
57 | ||
58 | if (dev->speed > 115200) | |
59 | delay = (bytes_left*8*10000) / (dev->speed/100); | |
60 | else if (dev->speed > 0) | |
61 | delay = (bytes_left*10*10000) / (dev->speed/100); | |
62 | else | |
63 | delay = 0; | |
64 | /* expected delay (usec) until remaining bytes are sent */ | |
65 | if (delay < 100) { | |
66 | udelay(delay); | |
67 | delay = 0; | |
68 | break; | |
69 | } | |
70 | /* sleep some longer delay (msec) */ | |
71 | delay = (delay+999) / 1000; | |
72 | break; | |
73 | ||
74 | case SIRDEV_STATE_WAIT_UNTIL_SENT: | |
75 | /* block until underlaying hardware buffer are empty */ | |
76 | if (dev->drv->wait_until_sent) | |
77 | dev->drv->wait_until_sent(dev); | |
78 | next_state = SIRDEV_STATE_TX_DONE; | |
79 | break; | |
80 | ||
81 | case SIRDEV_STATE_TX_DONE: | |
82 | return 0; | |
83 | ||
84 | default: | |
6c91023d | 85 | net_err_ratelimited("%s - undefined state\n", __func__); |
788252e6 CH |
86 | return -EINVAL; |
87 | } | |
88 | fsm->substate = next_state; | |
89 | } while (delay == 0); | |
90 | return delay; | |
91 | } | |
92 | ||
93 | /* | |
94 | * Function sirdev_config_fsm | |
95 | * | |
96 | * State machine to handle the configuration of the device (and attached dongle, if any). | |
97 | * This handler is scheduled for execution in kIrDAd context, so we can sleep. | |
98 | * however, kIrDAd is shared by all sir_dev devices so we better don't sleep there too | |
99 | * long. Instead, for longer delays we start a timer to reschedule us later. | |
100 | * On entry, fsm->sem is always locked and the netdev xmit queue stopped. | |
101 | * Both must be unlocked/restarted on completion - but only on final exit. | |
102 | */ | |
103 | ||
c4028958 | 104 | static void sirdev_config_fsm(struct work_struct *work) |
788252e6 | 105 | { |
c4028958 | 106 | struct sir_dev *dev = container_of(work, struct sir_dev, fsm.work.work); |
788252e6 CH |
107 | struct sir_fsm *fsm = &dev->fsm; |
108 | int next_state; | |
109 | int ret = -1; | |
110 | unsigned delay; | |
111 | ||
955a9d20 | 112 | pr_debug("%s(), <%ld>\n", __func__, jiffies); |
788252e6 CH |
113 | |
114 | do { | |
955a9d20 JP |
115 | pr_debug("%s - state=0x%04x / substate=0x%04x\n", |
116 | __func__, fsm->state, fsm->substate); | |
788252e6 CH |
117 | |
118 | next_state = fsm->state; | |
119 | delay = 0; | |
120 | ||
121 | switch(fsm->state) { | |
122 | ||
123 | case SIRDEV_STATE_DONGLE_OPEN: | |
124 | if (dev->dongle_drv != NULL) { | |
125 | ret = sirdev_put_dongle(dev); | |
126 | if (ret) { | |
127 | fsm->result = -EINVAL; | |
128 | next_state = SIRDEV_STATE_ERROR; | |
129 | break; | |
130 | } | |
131 | } | |
132 | ||
133 | /* Initialize dongle */ | |
134 | ret = sirdev_get_dongle(dev, fsm->param); | |
135 | if (ret) { | |
136 | fsm->result = ret; | |
137 | next_state = SIRDEV_STATE_ERROR; | |
138 | break; | |
139 | } | |
140 | ||
141 | /* Dongles are powered through the modem control lines which | |
142 | * were just set during open. Before resetting, let's wait for | |
143 | * the power to stabilize. This is what some dongle drivers did | |
144 | * in open before, while others didn't - should be safe anyway. | |
145 | */ | |
146 | ||
147 | delay = 50; | |
148 | fsm->substate = SIRDEV_STATE_DONGLE_RESET; | |
149 | next_state = SIRDEV_STATE_DONGLE_RESET; | |
150 | ||
151 | fsm->param = 9600; | |
152 | ||
153 | break; | |
154 | ||
155 | case SIRDEV_STATE_DONGLE_CLOSE: | |
156 | /* shouldn't we just treat this as success=? */ | |
157 | if (dev->dongle_drv == NULL) { | |
158 | fsm->result = -EINVAL; | |
159 | next_state = SIRDEV_STATE_ERROR; | |
160 | break; | |
161 | } | |
162 | ||
163 | ret = sirdev_put_dongle(dev); | |
164 | if (ret) { | |
165 | fsm->result = ret; | |
166 | next_state = SIRDEV_STATE_ERROR; | |
167 | break; | |
168 | } | |
169 | next_state = SIRDEV_STATE_DONE; | |
170 | break; | |
171 | ||
172 | case SIRDEV_STATE_SET_DTR_RTS: | |
173 | ret = sirdev_set_dtr_rts(dev, | |
174 | (fsm->param&0x02) ? TRUE : FALSE, | |
175 | (fsm->param&0x01) ? TRUE : FALSE); | |
176 | next_state = SIRDEV_STATE_DONE; | |
177 | break; | |
178 | ||
179 | case SIRDEV_STATE_SET_SPEED: | |
180 | fsm->substate = SIRDEV_STATE_WAIT_XMIT; | |
181 | next_state = SIRDEV_STATE_DONGLE_CHECK; | |
182 | break; | |
183 | ||
184 | case SIRDEV_STATE_DONGLE_CHECK: | |
185 | ret = sirdev_tx_complete_fsm(dev); | |
186 | if (ret < 0) { | |
187 | fsm->result = ret; | |
188 | next_state = SIRDEV_STATE_ERROR; | |
189 | break; | |
190 | } | |
191 | if ((delay=ret) != 0) | |
192 | break; | |
193 | ||
194 | if (dev->dongle_drv) { | |
195 | fsm->substate = SIRDEV_STATE_DONGLE_RESET; | |
196 | next_state = SIRDEV_STATE_DONGLE_RESET; | |
197 | } | |
198 | else { | |
199 | dev->speed = fsm->param; | |
200 | next_state = SIRDEV_STATE_PORT_SPEED; | |
201 | } | |
202 | break; | |
203 | ||
204 | case SIRDEV_STATE_DONGLE_RESET: | |
205 | if (dev->dongle_drv->reset) { | |
206 | ret = dev->dongle_drv->reset(dev); | |
207 | if (ret < 0) { | |
208 | fsm->result = ret; | |
209 | next_state = SIRDEV_STATE_ERROR; | |
210 | break; | |
211 | } | |
212 | } | |
213 | else | |
214 | ret = 0; | |
215 | if ((delay=ret) == 0) { | |
216 | /* set serial port according to dongle default speed */ | |
217 | if (dev->drv->set_speed) | |
218 | dev->drv->set_speed(dev, dev->speed); | |
219 | fsm->substate = SIRDEV_STATE_DONGLE_SPEED; | |
220 | next_state = SIRDEV_STATE_DONGLE_SPEED; | |
221 | } | |
222 | break; | |
223 | ||
224 | case SIRDEV_STATE_DONGLE_SPEED: | |
2355a62b | 225 | if (dev->dongle_drv->set_speed) { |
788252e6 CH |
226 | ret = dev->dongle_drv->set_speed(dev, fsm->param); |
227 | if (ret < 0) { | |
228 | fsm->result = ret; | |
229 | next_state = SIRDEV_STATE_ERROR; | |
230 | break; | |
231 | } | |
232 | } | |
233 | else | |
234 | ret = 0; | |
235 | if ((delay=ret) == 0) | |
236 | next_state = SIRDEV_STATE_PORT_SPEED; | |
237 | break; | |
238 | ||
239 | case SIRDEV_STATE_PORT_SPEED: | |
240 | /* Finally we are ready to change the serial port speed */ | |
241 | if (dev->drv->set_speed) | |
242 | dev->drv->set_speed(dev, dev->speed); | |
243 | dev->new_speed = 0; | |
244 | next_state = SIRDEV_STATE_DONE; | |
245 | break; | |
246 | ||
247 | case SIRDEV_STATE_DONE: | |
248 | /* Signal network layer so it can send more frames */ | |
249 | netif_wake_queue(dev->netdev); | |
250 | next_state = SIRDEV_STATE_COMPLETE; | |
251 | break; | |
252 | ||
253 | default: | |
6c91023d | 254 | net_err_ratelimited("%s - undefined state\n", __func__); |
788252e6 CH |
255 | fsm->result = -EINVAL; |
256 | /* fall thru */ | |
257 | ||
258 | case SIRDEV_STATE_ERROR: | |
6c91023d JP |
259 | net_err_ratelimited("%s - error: %d\n", |
260 | __func__, fsm->result); | |
788252e6 CH |
261 | |
262 | #if 0 /* don't enable this before we have netdev->tx_timeout to recover */ | |
263 | netif_stop_queue(dev->netdev); | |
264 | #else | |
265 | netif_wake_queue(dev->netdev); | |
266 | #endif | |
267 | /* fall thru */ | |
268 | ||
269 | case SIRDEV_STATE_COMPLETE: | |
270 | /* config change finished, so we are not busy any longer */ | |
271 | sirdev_enable_rx(dev); | |
272 | up(&fsm->sem); | |
273 | return; | |
274 | } | |
275 | fsm->state = next_state; | |
276 | } while(!delay); | |
277 | ||
278 | queue_delayed_work(irda_sir_wq, &fsm->work, msecs_to_jiffies(delay)); | |
279 | } | |
280 | ||
281 | /* schedule some device configuration task for execution by kIrDAd | |
282 | * on behalf of the above state machine. | |
283 | * can be called from process or interrupt/tasklet context. | |
284 | */ | |
285 | ||
286 | int sirdev_schedule_request(struct sir_dev *dev, int initial_state, unsigned param) | |
287 | { | |
288 | struct sir_fsm *fsm = &dev->fsm; | |
289 | ||
955a9d20 JP |
290 | pr_debug("%s - state=0x%04x / param=%u\n", __func__, |
291 | initial_state, param); | |
788252e6 CH |
292 | |
293 | if (down_trylock(&fsm->sem)) { | |
294 | if (in_interrupt() || in_atomic() || irqs_disabled()) { | |
955a9d20 | 295 | pr_debug("%s(), state machine busy!\n", __func__); |
788252e6 CH |
296 | return -EWOULDBLOCK; |
297 | } else | |
298 | down(&fsm->sem); | |
299 | } | |
300 | ||
301 | if (fsm->state == SIRDEV_STATE_DEAD) { | |
302 | /* race with sirdev_close should never happen */ | |
6c91023d | 303 | net_err_ratelimited("%s(), instance staled!\n", __func__); |
788252e6 CH |
304 | up(&fsm->sem); |
305 | return -ESTALE; /* or better EPIPE? */ | |
306 | } | |
307 | ||
308 | netif_stop_queue(dev->netdev); | |
309 | atomic_set(&dev->enable_rx, 0); | |
310 | ||
311 | fsm->state = initial_state; | |
312 | fsm->param = param; | |
313 | fsm->result = 0; | |
314 | ||
c4028958 DH |
315 | INIT_DELAYED_WORK(&fsm->work, sirdev_config_fsm); |
316 | queue_delayed_work(irda_sir_wq, &fsm->work, 0); | |
788252e6 CH |
317 | return 0; |
318 | } | |
319 | ||
320 | ||
1da177e4 LT |
321 | /***************************************************************************/ |
322 | ||
323 | void sirdev_enable_rx(struct sir_dev *dev) | |
324 | { | |
325 | if (unlikely(atomic_read(&dev->enable_rx))) | |
326 | return; | |
327 | ||
328 | /* flush rx-buffer - should also help in case of problems with echo cancelation */ | |
329 | dev->rx_buff.data = dev->rx_buff.head; | |
330 | dev->rx_buff.len = 0; | |
331 | dev->rx_buff.in_frame = FALSE; | |
332 | dev->rx_buff.state = OUTSIDE_FRAME; | |
333 | atomic_set(&dev->enable_rx, 1); | |
334 | } | |
335 | ||
336 | static int sirdev_is_receiving(struct sir_dev *dev) | |
337 | { | |
338 | if (!atomic_read(&dev->enable_rx)) | |
339 | return 0; | |
340 | ||
807540ba | 341 | return dev->rx_buff.state != OUTSIDE_FRAME; |
1da177e4 LT |
342 | } |
343 | ||
344 | int sirdev_set_dongle(struct sir_dev *dev, IRDA_DONGLE type) | |
345 | { | |
346 | int err; | |
347 | ||
955a9d20 | 348 | pr_debug("%s : requesting dongle %d.\n", __func__, type); |
1da177e4 LT |
349 | |
350 | err = sirdev_schedule_dongle_open(dev, type); | |
351 | if (unlikely(err)) | |
352 | return err; | |
353 | down(&dev->fsm.sem); /* block until config change completed */ | |
354 | err = dev->fsm.result; | |
355 | up(&dev->fsm.sem); | |
356 | return err; | |
357 | } | |
214ad784 | 358 | EXPORT_SYMBOL(sirdev_set_dongle); |
1da177e4 LT |
359 | |
360 | /* used by dongle drivers for dongle programming */ | |
361 | ||
362 | int sirdev_raw_write(struct sir_dev *dev, const char *buf, int len) | |
363 | { | |
364 | unsigned long flags; | |
365 | int ret; | |
366 | ||
367 | if (unlikely(len > dev->tx_buff.truesize)) | |
368 | return -ENOSPC; | |
369 | ||
370 | spin_lock_irqsave(&dev->tx_lock, flags); /* serialize with other tx operations */ | |
371 | while (dev->tx_buff.len > 0) { /* wait until tx idle */ | |
372 | spin_unlock_irqrestore(&dev->tx_lock, flags); | |
373 | msleep(10); | |
374 | spin_lock_irqsave(&dev->tx_lock, flags); | |
375 | } | |
376 | ||
377 | dev->tx_buff.data = dev->tx_buff.head; | |
378 | memcpy(dev->tx_buff.data, buf, len); | |
379 | dev->tx_buff.len = len; | |
380 | ||
381 | ret = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len); | |
382 | if (ret > 0) { | |
955a9d20 | 383 | pr_debug("%s(), raw-tx started\n", __func__); |
1da177e4 LT |
384 | |
385 | dev->tx_buff.data += ret; | |
386 | dev->tx_buff.len -= ret; | |
387 | dev->raw_tx = 1; | |
388 | ret = len; /* all data is going to be sent */ | |
389 | } | |
390 | spin_unlock_irqrestore(&dev->tx_lock, flags); | |
391 | return ret; | |
392 | } | |
214ad784 | 393 | EXPORT_SYMBOL(sirdev_raw_write); |
1da177e4 LT |
394 | |
395 | /* seems some dongle drivers may need this */ | |
396 | ||
397 | int sirdev_raw_read(struct sir_dev *dev, char *buf, int len) | |
398 | { | |
399 | int count; | |
400 | ||
401 | if (atomic_read(&dev->enable_rx)) | |
402 | return -EIO; /* fail if we expect irda-frames */ | |
403 | ||
404 | count = (len < dev->rx_buff.len) ? len : dev->rx_buff.len; | |
405 | ||
406 | if (count > 0) { | |
407 | memcpy(buf, dev->rx_buff.data, count); | |
408 | dev->rx_buff.data += count; | |
409 | dev->rx_buff.len -= count; | |
410 | } | |
411 | ||
412 | /* remaining stuff gets flushed when re-enabling normal rx */ | |
413 | ||
414 | return count; | |
415 | } | |
214ad784 | 416 | EXPORT_SYMBOL(sirdev_raw_read); |
1da177e4 LT |
417 | |
418 | int sirdev_set_dtr_rts(struct sir_dev *dev, int dtr, int rts) | |
419 | { | |
420 | int ret = -ENXIO; | |
37e1370b | 421 | if (dev->drv->set_dtr_rts) |
1da177e4 LT |
422 | ret = dev->drv->set_dtr_rts(dev, dtr, rts); |
423 | return ret; | |
424 | } | |
214ad784 AB |
425 | EXPORT_SYMBOL(sirdev_set_dtr_rts); |
426 | ||
1da177e4 LT |
427 | /**********************************************************************/ |
428 | ||
429 | /* called from client driver - likely with bh-context - to indicate | |
430 | * it made some progress with transmission. Hence we send the next | |
431 | * chunk, if any, or complete the skb otherwise | |
432 | */ | |
433 | ||
434 | void sirdev_write_complete(struct sir_dev *dev) | |
435 | { | |
436 | unsigned long flags; | |
437 | struct sk_buff *skb; | |
438 | int actual = 0; | |
439 | int err; | |
440 | ||
441 | spin_lock_irqsave(&dev->tx_lock, flags); | |
442 | ||
955a9d20 JP |
443 | pr_debug("%s() - dev->tx_buff.len = %d\n", |
444 | __func__, dev->tx_buff.len); | |
1da177e4 LT |
445 | |
446 | if (likely(dev->tx_buff.len > 0)) { | |
447 | /* Write data left in transmit buffer */ | |
448 | actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len); | |
449 | ||
450 | if (likely(actual>0)) { | |
451 | dev->tx_buff.data += actual; | |
452 | dev->tx_buff.len -= actual; | |
453 | } | |
454 | else if (unlikely(actual<0)) { | |
455 | /* could be dropped later when we have tx_timeout to recover */ | |
6c91023d JP |
456 | net_err_ratelimited("%s: drv->do_write failed (%d)\n", |
457 | __func__, actual); | |
1da177e4 LT |
458 | if ((skb=dev->tx_skb) != NULL) { |
459 | dev->tx_skb = NULL; | |
460 | dev_kfree_skb_any(skb); | |
af049081 SH |
461 | dev->netdev->stats.tx_errors++; |
462 | dev->netdev->stats.tx_dropped++; | |
1da177e4 LT |
463 | } |
464 | dev->tx_buff.len = 0; | |
465 | } | |
466 | if (dev->tx_buff.len > 0) | |
467 | goto done; /* more data to send later */ | |
468 | } | |
469 | ||
470 | if (unlikely(dev->raw_tx != 0)) { | |
471 | /* in raw mode we are just done now after the buffer was sent | |
472 | * completely. Since this was requested by some dongle driver | |
473 | * running under the control of the irda-thread we must take | |
474 | * care here not to re-enable the queue. The queue will be | |
475 | * restarted when the irda-thread has completed the request. | |
476 | */ | |
477 | ||
955a9d20 | 478 | pr_debug("%s(), raw-tx done\n", __func__); |
1da177e4 LT |
479 | dev->raw_tx = 0; |
480 | goto done; /* no post-frame handling in raw mode */ | |
481 | } | |
482 | ||
483 | /* we have finished now sending this skb. | |
484 | * update statistics and free the skb. | |
485 | * finally we check and trigger a pending speed change, if any. | |
486 | * if not we switch to rx mode and wake the queue for further | |
487 | * packets. | |
488 | * note the scheduled speed request blocks until the lower | |
489 | * client driver and the corresponding hardware has really | |
490 | * finished sending all data (xmit fifo drained f.e.) | |
491 | * before the speed change gets finally done and the queue | |
492 | * re-activated. | |
493 | */ | |
494 | ||
955a9d20 | 495 | pr_debug("%s(), finished with frame!\n", __func__); |
1da177e4 LT |
496 | |
497 | if ((skb=dev->tx_skb) != NULL) { | |
498 | dev->tx_skb = NULL; | |
af049081 SH |
499 | dev->netdev->stats.tx_packets++; |
500 | dev->netdev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
501 | dev_kfree_skb_any(skb); |
502 | } | |
503 | ||
504 | if (unlikely(dev->new_speed > 0)) { | |
955a9d20 | 505 | pr_debug("%s(), Changing speed!\n", __func__); |
1da177e4 LT |
506 | err = sirdev_schedule_speed(dev, dev->new_speed); |
507 | if (unlikely(err)) { | |
508 | /* should never happen | |
509 | * forget the speed change and hope the stack recovers | |
510 | */ | |
6c91023d JP |
511 | net_err_ratelimited("%s - schedule speed change failed: %d\n", |
512 | __func__, err); | |
1da177e4 LT |
513 | netif_wake_queue(dev->netdev); |
514 | } | |
515 | /* else: success | |
516 | * speed change in progress now | |
517 | * on completion dev->new_speed gets cleared, | |
518 | * rx-reenabled and the queue restarted | |
519 | */ | |
520 | } | |
521 | else { | |
522 | sirdev_enable_rx(dev); | |
523 | netif_wake_queue(dev->netdev); | |
524 | } | |
525 | ||
526 | done: | |
527 | spin_unlock_irqrestore(&dev->tx_lock, flags); | |
528 | } | |
214ad784 | 529 | EXPORT_SYMBOL(sirdev_write_complete); |
1da177e4 LT |
530 | |
531 | /* called from client driver - likely with bh-context - to give us | |
532 | * some more received bytes. We put them into the rx-buffer, | |
533 | * normally unwrapping and building LAP-skb's (unless rx disabled) | |
534 | */ | |
535 | ||
536 | int sirdev_receive(struct sir_dev *dev, const unsigned char *cp, size_t count) | |
537 | { | |
538 | if (!dev || !dev->netdev) { | |
6c91023d | 539 | net_warn_ratelimited("%s(), not ready yet!\n", __func__); |
1da177e4 LT |
540 | return -1; |
541 | } | |
542 | ||
543 | if (!dev->irlap) { | |
6c91023d JP |
544 | net_warn_ratelimited("%s - too early: %p / %zd!\n", |
545 | __func__, cp, count); | |
1da177e4 LT |
546 | return -1; |
547 | } | |
548 | ||
549 | if (cp==NULL) { | |
550 | /* error already at lower level receive | |
551 | * just update stats and set media busy | |
552 | */ | |
553 | irda_device_set_media_busy(dev->netdev, TRUE); | |
af049081 | 554 | dev->netdev->stats.rx_dropped++; |
955a9d20 | 555 | pr_debug("%s; rx-drop: %zd\n", __func__, count); |
1da177e4 LT |
556 | return 0; |
557 | } | |
558 | ||
559 | /* Read the characters into the buffer */ | |
560 | if (likely(atomic_read(&dev->enable_rx))) { | |
561 | while (count--) | |
562 | /* Unwrap and destuff one byte */ | |
af049081 | 563 | async_unwrap_char(dev->netdev, &dev->netdev->stats, |
1da177e4 LT |
564 | &dev->rx_buff, *cp++); |
565 | } else { | |
566 | while (count--) { | |
567 | /* rx not enabled: save the raw bytes and never | |
568 | * trigger any netif_rx. The received bytes are flushed | |
569 | * later when we re-enable rx but might be read meanwhile | |
570 | * by the dongle driver. | |
571 | */ | |
572 | dev->rx_buff.data[dev->rx_buff.len++] = *cp++; | |
573 | ||
574 | /* What should we do when the buffer is full? */ | |
575 | if (unlikely(dev->rx_buff.len == dev->rx_buff.truesize)) | |
576 | dev->rx_buff.len = 0; | |
577 | } | |
578 | } | |
579 | ||
580 | return 0; | |
581 | } | |
214ad784 | 582 | EXPORT_SYMBOL(sirdev_receive); |
1da177e4 LT |
583 | |
584 | /**********************************************************************/ | |
585 | ||
586 | /* callbacks from network layer */ | |
587 | ||
6518bbb8 SH |
588 | static netdev_tx_t sirdev_hard_xmit(struct sk_buff *skb, |
589 | struct net_device *ndev) | |
1da177e4 | 590 | { |
4cf1653a | 591 | struct sir_dev *dev = netdev_priv(ndev); |
1da177e4 LT |
592 | unsigned long flags; |
593 | int actual = 0; | |
594 | int err; | |
595 | s32 speed; | |
596 | ||
ec634fe3 | 597 | IRDA_ASSERT(dev != NULL, return NETDEV_TX_OK;); |
1da177e4 LT |
598 | |
599 | netif_stop_queue(ndev); | |
600 | ||
955a9d20 | 601 | pr_debug("%s(), skb->len = %d\n", __func__, skb->len); |
1da177e4 LT |
602 | |
603 | speed = irda_get_next_speed(skb); | |
604 | if ((speed != dev->speed) && (speed != -1)) { | |
605 | if (!skb->len) { | |
606 | err = sirdev_schedule_speed(dev, speed); | |
607 | if (unlikely(err == -EWOULDBLOCK)) { | |
608 | /* Failed to initiate the speed change, likely the fsm | |
609 | * is still busy (pretty unlikely, but...) | |
610 | * We refuse to accept the skb and return with the queue | |
611 | * stopped so the network layer will retry after the | |
612 | * fsm completes and wakes the queue. | |
613 | */ | |
5b548140 | 614 | return NETDEV_TX_BUSY; |
1da177e4 LT |
615 | } |
616 | else if (unlikely(err)) { | |
617 | /* other fatal error - forget the speed change and | |
618 | * hope the stack will recover somehow | |
619 | */ | |
620 | netif_start_queue(ndev); | |
621 | } | |
622 | /* else: success | |
623 | * speed change in progress now | |
624 | * on completion the queue gets restarted | |
625 | */ | |
626 | ||
627 | dev_kfree_skb_any(skb); | |
6ed10654 | 628 | return NETDEV_TX_OK; |
1da177e4 LT |
629 | } else |
630 | dev->new_speed = speed; | |
631 | } | |
632 | ||
633 | /* Init tx buffer*/ | |
634 | dev->tx_buff.data = dev->tx_buff.head; | |
635 | ||
636 | /* Check problems */ | |
637 | if(spin_is_locked(&dev->tx_lock)) { | |
955a9d20 | 638 | pr_debug("%s(), write not completed\n", __func__); |
1da177e4 LT |
639 | } |
640 | ||
641 | /* serialize with write completion */ | |
642 | spin_lock_irqsave(&dev->tx_lock, flags); | |
643 | ||
644 | /* Copy skb to tx_buff while wrapping, stuffing and making CRC */ | |
645 | dev->tx_buff.len = async_wrap_skb(skb, dev->tx_buff.data, dev->tx_buff.truesize); | |
646 | ||
647 | /* transmission will start now - disable receive. | |
648 | * if we are just in the middle of an incoming frame, | |
649 | * treat it as collision. probably it's a good idea to | |
650 | * reset the rx_buf OUTSIDE_FRAME in this case too? | |
651 | */ | |
652 | atomic_set(&dev->enable_rx, 0); | |
653 | if (unlikely(sirdev_is_receiving(dev))) | |
af049081 | 654 | dev->netdev->stats.collisions++; |
1da177e4 LT |
655 | |
656 | actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len); | |
657 | ||
658 | if (likely(actual > 0)) { | |
659 | dev->tx_skb = skb; | |
1da177e4 LT |
660 | dev->tx_buff.data += actual; |
661 | dev->tx_buff.len -= actual; | |
662 | } | |
663 | else if (unlikely(actual < 0)) { | |
664 | /* could be dropped later when we have tx_timeout to recover */ | |
6c91023d JP |
665 | net_err_ratelimited("%s: drv->do_write failed (%d)\n", |
666 | __func__, actual); | |
1da177e4 | 667 | dev_kfree_skb_any(skb); |
af049081 SH |
668 | dev->netdev->stats.tx_errors++; |
669 | dev->netdev->stats.tx_dropped++; | |
1da177e4 LT |
670 | netif_wake_queue(ndev); |
671 | } | |
672 | spin_unlock_irqrestore(&dev->tx_lock, flags); | |
673 | ||
6ed10654 | 674 | return NETDEV_TX_OK; |
1da177e4 LT |
675 | } |
676 | ||
677 | /* called from network layer with rtnl hold */ | |
678 | ||
679 | static int sirdev_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd) | |
680 | { | |
681 | struct if_irda_req *irq = (struct if_irda_req *) rq; | |
4cf1653a | 682 | struct sir_dev *dev = netdev_priv(ndev); |
1da177e4 LT |
683 | int ret = 0; |
684 | ||
685 | IRDA_ASSERT(dev != NULL, return -1;); | |
686 | ||
955a9d20 | 687 | pr_debug("%s(), %s, (cmd=0x%X)\n", __func__, ndev->name, cmd); |
1da177e4 LT |
688 | |
689 | switch (cmd) { | |
690 | case SIOCSBANDWIDTH: /* Set bandwidth */ | |
691 | if (!capable(CAP_NET_ADMIN)) | |
692 | ret = -EPERM; | |
693 | else | |
694 | ret = sirdev_schedule_speed(dev, irq->ifr_baudrate); | |
695 | /* cannot sleep here for completion | |
696 | * we are called from network layer with rtnl hold | |
697 | */ | |
698 | break; | |
699 | ||
700 | case SIOCSDONGLE: /* Set dongle */ | |
701 | if (!capable(CAP_NET_ADMIN)) | |
702 | ret = -EPERM; | |
703 | else | |
704 | ret = sirdev_schedule_dongle_open(dev, irq->ifr_dongle); | |
705 | /* cannot sleep here for completion | |
706 | * we are called from network layer with rtnl hold | |
707 | */ | |
708 | break; | |
709 | ||
710 | case SIOCSMEDIABUSY: /* Set media busy */ | |
711 | if (!capable(CAP_NET_ADMIN)) | |
712 | ret = -EPERM; | |
713 | else | |
714 | irda_device_set_media_busy(dev->netdev, TRUE); | |
715 | break; | |
716 | ||
717 | case SIOCGRECEIVING: /* Check if we are receiving right now */ | |
718 | irq->ifr_receiving = sirdev_is_receiving(dev); | |
719 | break; | |
720 | ||
721 | case SIOCSDTRRTS: | |
722 | if (!capable(CAP_NET_ADMIN)) | |
723 | ret = -EPERM; | |
724 | else | |
725 | ret = sirdev_schedule_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts); | |
726 | /* cannot sleep here for completion | |
727 | * we are called from network layer with rtnl hold | |
728 | */ | |
729 | break; | |
730 | ||
731 | case SIOCSMODE: | |
732 | #if 0 | |
733 | if (!capable(CAP_NET_ADMIN)) | |
734 | ret = -EPERM; | |
735 | else | |
736 | ret = sirdev_schedule_mode(dev, irq->ifr_mode); | |
737 | /* cannot sleep here for completion | |
738 | * we are called from network layer with rtnl hold | |
739 | */ | |
740 | break; | |
741 | #endif | |
742 | default: | |
743 | ret = -EOPNOTSUPP; | |
744 | } | |
745 | ||
746 | return ret; | |
747 | } | |
748 | ||
749 | /* ----------------------------------------------------------------------------- */ | |
750 | ||
751 | #define SIRBUF_ALLOCSIZE 4269 /* worst case size of a wrapped IrLAP frame */ | |
752 | ||
753 | static int sirdev_alloc_buffers(struct sir_dev *dev) | |
754 | { | |
755 | dev->tx_buff.truesize = SIRBUF_ALLOCSIZE; | |
756 | dev->rx_buff.truesize = IRDA_SKB_MAX_MTU; | |
757 | ||
758 | /* Bootstrap ZeroCopy Rx */ | |
e4e90b21 DM |
759 | dev->rx_buff.skb = __netdev_alloc_skb(dev->netdev, dev->rx_buff.truesize, |
760 | GFP_KERNEL); | |
1da177e4 LT |
761 | if (dev->rx_buff.skb == NULL) |
762 | return -ENOMEM; | |
763 | skb_reserve(dev->rx_buff.skb, 1); | |
764 | dev->rx_buff.head = dev->rx_buff.skb->data; | |
765 | ||
766 | dev->tx_buff.head = kmalloc(dev->tx_buff.truesize, GFP_KERNEL); | |
767 | if (dev->tx_buff.head == NULL) { | |
768 | kfree_skb(dev->rx_buff.skb); | |
769 | dev->rx_buff.skb = NULL; | |
770 | dev->rx_buff.head = NULL; | |
771 | return -ENOMEM; | |
772 | } | |
773 | ||
774 | dev->tx_buff.data = dev->tx_buff.head; | |
775 | dev->rx_buff.data = dev->rx_buff.head; | |
776 | dev->tx_buff.len = 0; | |
777 | dev->rx_buff.len = 0; | |
778 | ||
779 | dev->rx_buff.in_frame = FALSE; | |
780 | dev->rx_buff.state = OUTSIDE_FRAME; | |
781 | return 0; | |
782 | }; | |
783 | ||
784 | static void sirdev_free_buffers(struct sir_dev *dev) | |
785 | { | |
875b4829 | 786 | kfree_skb(dev->rx_buff.skb); |
b4558ea9 | 787 | kfree(dev->tx_buff.head); |
1da177e4 LT |
788 | dev->rx_buff.head = dev->tx_buff.head = NULL; |
789 | dev->rx_buff.skb = NULL; | |
790 | } | |
791 | ||
792 | static int sirdev_open(struct net_device *ndev) | |
793 | { | |
4cf1653a | 794 | struct sir_dev *dev = netdev_priv(ndev); |
1da177e4 LT |
795 | const struct sir_driver *drv = dev->drv; |
796 | ||
797 | if (!drv) | |
798 | return -ENODEV; | |
799 | ||
800 | /* increase the reference count of the driver module before doing serious stuff */ | |
801 | if (!try_module_get(drv->owner)) | |
802 | return -ESTALE; | |
803 | ||
1da177e4 LT |
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 | ||
955a9d20 | 820 | pr_debug("%s - done, speed = %d\n", __func__, dev->speed); |
1da177e4 LT |
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 | { | |
4cf1653a | 837 | struct sir_dev *dev = netdev_priv(ndev); |
1da177e4 LT |
838 | const struct sir_driver *drv; |
839 | ||
955a9d20 | 840 | /* pr_debug("%s\n", __func__); */ |
1da177e4 LT |
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 | ||
2b023f46 SH |
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 | }; | |
1da177e4 LT |
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 | ||
955a9d20 | 882 | pr_debug("%s - %s\n", __func__, name); |
1da177e4 LT |
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) { | |
6c91023d JP |
896 | net_err_ratelimited("%s - Can't allocate memory for IrDA control block!\n", |
897 | __func__); | |
1da177e4 LT |
898 | goto out; |
899 | } | |
4cf1653a | 900 | dev = netdev_priv(ndev); |
1da177e4 LT |
901 | |
902 | irda_init_max_qos_capabilies(&dev->qos); | |
903 | dev->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|IR_115200; | |
904 | dev->qos.min_turn_time.bits = drv->qos_mtt_bits; | |
905 | irda_qos_bits_to_value(&dev->qos); | |
906 | ||
907 | strncpy(dev->hwname, name, sizeof(dev->hwname)-1); | |
908 | ||
909 | atomic_set(&dev->enable_rx, 0); | |
910 | dev->tx_skb = NULL; | |
911 | ||
912 | spin_lock_init(&dev->tx_lock); | |
db7f859e | 913 | sema_init(&dev->fsm.sem, 1); |
1da177e4 | 914 | |
1da177e4 LT |
915 | dev->drv = drv; |
916 | dev->netdev = ndev; | |
917 | ||
1da177e4 | 918 | /* Override the network functions we need to use */ |
2b023f46 | 919 | ndev->netdev_ops = &sirdev_ops; |
1da177e4 LT |
920 | |
921 | if (register_netdev(ndev)) { | |
6c91023d JP |
922 | net_err_ratelimited("%s(), register_netdev() failed!\n", |
923 | __func__); | |
1da177e4 LT |
924 | goto out_freenetdev; |
925 | } | |
926 | ||
927 | return dev; | |
928 | ||
929 | out_freenetdev: | |
930 | free_netdev(ndev); | |
931 | out: | |
932 | return NULL; | |
933 | } | |
214ad784 | 934 | EXPORT_SYMBOL(sirdev_get_instance); |
1da177e4 LT |
935 | |
936 | int sirdev_put_instance(struct sir_dev *dev) | |
937 | { | |
938 | int err = 0; | |
939 | ||
955a9d20 | 940 | pr_debug("%s\n", __func__); |
1da177e4 LT |
941 | |
942 | atomic_set(&dev->enable_rx, 0); | |
943 | ||
944 | netif_carrier_off(dev->netdev); | |
945 | netif_device_detach(dev->netdev); | |
946 | ||
947 | if (dev->dongle_drv) | |
948 | err = sirdev_schedule_dongle_close(dev); | |
949 | if (err) | |
6c91023d | 950 | net_err_ratelimited("%s - error %d\n", __func__, err); |
1da177e4 LT |
951 | |
952 | sirdev_close(dev->netdev); | |
953 | ||
954 | down(&dev->fsm.sem); | |
955 | dev->fsm.state = SIRDEV_STATE_DEAD; /* mark staled */ | |
956 | dev->dongle_drv = NULL; | |
957 | dev->priv = NULL; | |
958 | up(&dev->fsm.sem); | |
959 | ||
960 | /* Remove netdevice */ | |
961 | unregister_netdev(dev->netdev); | |
962 | ||
963 | free_netdev(dev->netdev); | |
964 | ||
965 | return 0; | |
966 | } | |
214ad784 | 967 | EXPORT_SYMBOL(sirdev_put_instance); |
1da177e4 | 968 | |
788252e6 CH |
969 | static int __init sir_wq_init(void) |
970 | { | |
971 | irda_sir_wq = create_singlethread_workqueue("irda_sir_wq"); | |
972 | if (!irda_sir_wq) | |
973 | return -ENOMEM; | |
974 | return 0; | |
975 | } | |
976 | ||
977 | static void __exit sir_wq_exit(void) | |
978 | { | |
979 | destroy_workqueue(irda_sir_wq); | |
980 | } | |
981 | ||
982 | module_init(sir_wq_init); | |
983 | module_exit(sir_wq_exit); | |
984 | ||
985 | MODULE_AUTHOR("Martin Diehl <info@mdiehl.de>"); | |
986 | MODULE_DESCRIPTION("IrDA SIR core"); | |
987 | MODULE_LICENSE("GPL"); |