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net: remove interrupt.h inclusion from netdevice.h
[linux-2.6-block.git] / drivers / net / irda / sir_dev.c
CommitLineData
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
28static 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
36static 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:
a97a6f10 85 IRDA_ERROR("%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 104static 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
a97a6f10 112 IRDA_DEBUG(2, "%s(), <%ld>\n", __func__, jiffies);
788252e6
CH		 113
114 do {
115 IRDA_DEBUG(3, "%s - state=0x%04x / substate=0x%04x\n",
a97a6f10 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:
225 if (dev->dongle_drv->reset) {
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:
a97a6f10 254 IRDA_ERROR("%s - undefined state\n", __func__);
788252e6
CH		 255 fsm->result = -EINVAL;
256 /* fall thru */
257
258 case SIRDEV_STATE_ERROR:
a97a6f10 259 IRDA_ERROR("%s - error: %d\n", __func__, fsm->result);
788252e6
CH		 260
261#if 0 /* don't enable this before we have netdev->tx_timeout to recover */
262 netif_stop_queue(dev->netdev);
263#else
264 netif_wake_queue(dev->netdev);
265#endif
266 /* fall thru */
267
268 case SIRDEV_STATE_COMPLETE:
269 /* config change finished, so we are not busy any longer */
270 sirdev_enable_rx(dev);
271 up(&fsm->sem);
272 return;
273 }
274 fsm->state = next_state;
275 } while(!delay);
276
277 queue_delayed_work(irda_sir_wq, &fsm->work, msecs_to_jiffies(delay));
278}
279
280/* schedule some device configuration task for execution by kIrDAd
281 * on behalf of the above state machine.
282 * can be called from process or interrupt/tasklet context.
283 */
284
285int sirdev_schedule_request(struct sir_dev *dev, int initial_state, unsigned param)
286{
287 struct sir_fsm *fsm = &dev->fsm;
288
a97a6f10
HH		 289 IRDA_DEBUG(2, "%s - state=0x%04x / param=%u\n", __func__,
290 initial_state, param);
788252e6
CH		 291
292 if (down_trylock(&fsm->sem)) {
293 if (in_interrupt() || in_atomic() || irqs_disabled()) {
a97a6f10 294 IRDA_DEBUG(1, "%s(), state machine busy!\n", __func__);
788252e6
CH		 295 return -EWOULDBLOCK;
296 } else
297 down(&fsm->sem);
298 }
299
300 if (fsm->state == SIRDEV_STATE_DEAD) {
301 /* race with sirdev_close should never happen */
a97a6f10 302 IRDA_ERROR("%s(), instance staled!\n", __func__);
788252e6
CH		 303 up(&fsm->sem);
304 return -ESTALE; /* or better EPIPE? */
305 }
306
307 netif_stop_queue(dev->netdev);
308 atomic_set(&dev->enable_rx, 0);
309
310 fsm->state = initial_state;
311 fsm->param = param;
312 fsm->result = 0;
313
c4028958
DH		 314 INIT_DELAYED_WORK(&fsm->work, sirdev_config_fsm);
315 queue_delayed_work(irda_sir_wq, &fsm->work, 0);
788252e6
CH		 316 return 0;
317}
318
319
1da177e4
LT		 320/***************************************************************************/
321
322void sirdev_enable_rx(struct sir_dev *dev)
323{
324 if (unlikely(atomic_read(&dev->enable_rx)))
325 return;
326
327 /* flush rx-buffer - should also help in case of problems with echo cancelation */
328 dev->rx_buff.data = dev->rx_buff.head;
329 dev->rx_buff.len = 0;
330 dev->rx_buff.in_frame = FALSE;
331 dev->rx_buff.state = OUTSIDE_FRAME;
332 atomic_set(&dev->enable_rx, 1);
333}
334
335static int sirdev_is_receiving(struct sir_dev *dev)
336{
337 if (!atomic_read(&dev->enable_rx))
338 return 0;
339
807540ba 340 return dev->rx_buff.state != OUTSIDE_FRAME;
1da177e4
LT		 341}
342
343int sirdev_set_dongle(struct sir_dev *dev, IRDA_DONGLE type)
344{
345 int err;
346
a97a6f10 347 IRDA_DEBUG(3, "%s : requesting dongle %d.\n", __func__, type);
1da177e4
LT		 348
349 err = sirdev_schedule_dongle_open(dev, type);
350 if (unlikely(err))
351 return err;
352 down(&dev->fsm.sem); /* block until config change completed */
353 err = dev->fsm.result;
354 up(&dev->fsm.sem);
355 return err;
356}
214ad784 357EXPORT_SYMBOL(sirdev_set_dongle);
1da177e4
LT		 358
359/* used by dongle drivers for dongle programming */
360
361int sirdev_raw_write(struct sir_dev *dev, const char *buf, int len)
362{
363 unsigned long flags;
364 int ret;
365
366 if (unlikely(len > dev->tx_buff.truesize))
367 return -ENOSPC;
368
369 spin_lock_irqsave(&dev->tx_lock, flags); /* serialize with other tx operations */
370 while (dev->tx_buff.len > 0) { /* wait until tx idle */
371 spin_unlock_irqrestore(&dev->tx_lock, flags);
372 msleep(10);
373 spin_lock_irqsave(&dev->tx_lock, flags);
374 }
375
376 dev->tx_buff.data = dev->tx_buff.head;
377 memcpy(dev->tx_buff.data, buf, len);
378 dev->tx_buff.len = len;
379
380 ret = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
381 if (ret > 0) {
a97a6f10 382 IRDA_DEBUG(3, "%s(), raw-tx started\n", __func__);
1da177e4
LT		 383
384 dev->tx_buff.data += ret;
385 dev->tx_buff.len -= ret;
386 dev->raw_tx = 1;
387 ret = len; /* all data is going to be sent */
388 }
389 spin_unlock_irqrestore(&dev->tx_lock, flags);
390 return ret;
391}
214ad784 392EXPORT_SYMBOL(sirdev_raw_write);
1da177e4
LT		 393
394/* seems some dongle drivers may need this */
395
396int sirdev_raw_read(struct sir_dev *dev, char *buf, int len)
397{
398 int count;
399
400 if (atomic_read(&dev->enable_rx))
401 return -EIO; /* fail if we expect irda-frames */
402
403 count = (len < dev->rx_buff.len) ? len : dev->rx_buff.len;
404
405 if (count > 0) {
406 memcpy(buf, dev->rx_buff.data, count);
407 dev->rx_buff.data += count;
408 dev->rx_buff.len -= count;
409 }
410
411 /* remaining stuff gets flushed when re-enabling normal rx */
412
413 return count;
414}
214ad784 415EXPORT_SYMBOL(sirdev_raw_read);
1da177e4
LT		 416
417int sirdev_set_dtr_rts(struct sir_dev *dev, int dtr, int rts)
418{
419 int ret = -ENXIO;
37e1370b 420 if (dev->drv->set_dtr_rts)
1da177e4
LT		 421 ret = dev->drv->set_dtr_rts(dev, dtr, rts);
422 return ret;
423}
214ad784
AB		 424EXPORT_SYMBOL(sirdev_set_dtr_rts);
425
1da177e4
LT		 426/**********************************************************************/
427
428/* called from client driver - likely with bh-context - to indicate
429 * it made some progress with transmission. Hence we send the next
430 * chunk, if any, or complete the skb otherwise
431 */
432
433void sirdev_write_complete(struct sir_dev *dev)
434{
435 unsigned long flags;
436 struct sk_buff *skb;
437 int actual = 0;
438 int err;
439
440 spin_lock_irqsave(&dev->tx_lock, flags);
441
442 IRDA_DEBUG(3, "%s() - dev->tx_buff.len = %d\n",
a97a6f10 443 __func__, dev->tx_buff.len);
1da177e4
LT		 444
445 if (likely(dev->tx_buff.len > 0)) {
446 /* Write data left in transmit buffer */
447 actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
448
449 if (likely(actual>0)) {
450 dev->tx_buff.data += actual;
451 dev->tx_buff.len -= actual;
452 }
453 else if (unlikely(actual<0)) {
454 /* could be dropped later when we have tx_timeout to recover */
455 IRDA_ERROR("%s: drv->do_write failed (%d)\n",
a97a6f10 456 __func__, actual);
1da177e4
LT		 457 if ((skb=dev->tx_skb) != NULL) {
458 dev->tx_skb = NULL;
459 dev_kfree_skb_any(skb);
af049081
SH		 460 dev->netdev->stats.tx_errors++;
461 dev->netdev->stats.tx_dropped++;
1da177e4
LT		 462 }
463 dev->tx_buff.len = 0;
464 }
465 if (dev->tx_buff.len > 0)
466 goto done; /* more data to send later */
467 }
468
469 if (unlikely(dev->raw_tx != 0)) {
470 /* in raw mode we are just done now after the buffer was sent
471 * completely. Since this was requested by some dongle driver
472 * running under the control of the irda-thread we must take
473 * care here not to re-enable the queue. The queue will be
474 * restarted when the irda-thread has completed the request.
475 */
476
a97a6f10 477 IRDA_DEBUG(3, "%s(), raw-tx done\n", __func__);
1da177e4
LT		 478 dev->raw_tx = 0;
479 goto done; /* no post-frame handling in raw mode */
480 }
481
482 /* we have finished now sending this skb.
483 * update statistics and free the skb.
484 * finally we check and trigger a pending speed change, if any.
485 * if not we switch to rx mode and wake the queue for further
486 * packets.
487 * note the scheduled speed request blocks until the lower
488 * client driver and the corresponding hardware has really
489 * finished sending all data (xmit fifo drained f.e.)
490 * before the speed change gets finally done and the queue
491 * re-activated.
492 */
493
a97a6f10 494 IRDA_DEBUG(5, "%s(), finished with frame!\n", __func__);
1da177e4
LT		 495
496 if ((skb=dev->tx_skb) != NULL) {
497 dev->tx_skb = NULL;
af049081
SH		 498 dev->netdev->stats.tx_packets++;
499 dev->netdev->stats.tx_bytes += skb->len;
1da177e4
LT		 500 dev_kfree_skb_any(skb);
501 }
502
503 if (unlikely(dev->new_speed > 0)) {
a97a6f10 504 IRDA_DEBUG(5, "%s(), Changing speed!\n", __func__);
1da177e4
LT		 505 err = sirdev_schedule_speed(dev, dev->new_speed);
506 if (unlikely(err)) {
507 /* should never happen
508 * forget the speed change and hope the stack recovers
509 */
510 IRDA_ERROR("%s - schedule speed change failed: %d\n",
a97a6f10 511 __func__, err);
1da177e4
LT		 512 netif_wake_queue(dev->netdev);
513 }
514 /* else: success
515 * speed change in progress now
516 * on completion dev->new_speed gets cleared,
517 * rx-reenabled and the queue restarted
518 */
519 }
520 else {
521 sirdev_enable_rx(dev);
522 netif_wake_queue(dev->netdev);
523 }
524
525done:
526 spin_unlock_irqrestore(&dev->tx_lock, flags);
527}
214ad784 528EXPORT_SYMBOL(sirdev_write_complete);
1da177e4
LT		 529
530/* called from client driver - likely with bh-context - to give us
531 * some more received bytes. We put them into the rx-buffer,
532 * normally unwrapping and building LAP-skb's (unless rx disabled)
533 */
534
535int sirdev_receive(struct sir_dev *dev, const unsigned char *cp, size_t count)
536{
537 if (!dev || !dev->netdev) {
a97a6f10 538 IRDA_WARNING("%s(), not ready yet!\n", __func__);
1da177e4
LT		 539 return -1;
540 }
541
542 if (!dev->irlap) {
543 IRDA_WARNING("%s - too early: %p / %zd!\n",
a97a6f10 544 __func__, cp, count);
1da177e4
LT		 545 return -1;
546 }
547
548 if (cp==NULL) {
549 /* error already at lower level receive
550 * just update stats and set media busy
551 */
552 irda_device_set_media_busy(dev->netdev, TRUE);
af049081 553 dev->netdev->stats.rx_dropped++;
a97a6f10 554 IRDA_DEBUG(0, "%s; rx-drop: %zd\n", __func__, count);
1da177e4
LT		 555 return 0;
556 }
557
558 /* Read the characters into the buffer */
559 if (likely(atomic_read(&dev->enable_rx))) {
560 while (count--)
561 /* Unwrap and destuff one byte */
af049081 562 async_unwrap_char(dev->netdev, &dev->netdev->stats,
1da177e4
LT		 563 &dev->rx_buff, *cp++);
564 } else {
565 while (count--) {
566 /* rx not enabled: save the raw bytes and never
567 * trigger any netif_rx. The received bytes are flushed
568 * later when we re-enable rx but might be read meanwhile
569 * by the dongle driver.
570 */
571 dev->rx_buff.data[dev->rx_buff.len++] = *cp++;
572
573 /* What should we do when the buffer is full? */
574 if (unlikely(dev->rx_buff.len == dev->rx_buff.truesize))
575 dev->rx_buff.len = 0;
576 }
577 }
578
579 return 0;
580}
214ad784 581EXPORT_SYMBOL(sirdev_receive);
1da177e4
LT		 582
583/**********************************************************************/
584
585/* callbacks from network layer */
586
6518bbb8
SH		 587static netdev_tx_t sirdev_hard_xmit(struct sk_buff *skb,
588 struct net_device *ndev)
1da177e4 589{
4cf1653a 590 struct sir_dev *dev = netdev_priv(ndev);
1da177e4
LT		 591 unsigned long flags;
592 int actual = 0;
593 int err;
594 s32 speed;
595
ec634fe3 596 IRDA_ASSERT(dev != NULL, return NETDEV_TX_OK;);
1da177e4
LT		 597
598 netif_stop_queue(ndev);
599
a97a6f10 600 IRDA_DEBUG(3, "%s(), skb->len = %d\n", __func__, skb->len);
1da177e4
LT		 601
602 speed = irda_get_next_speed(skb);
603 if ((speed != dev->speed) && (speed != -1)) {
604 if (!skb->len) {
605 err = sirdev_schedule_speed(dev, speed);
606 if (unlikely(err == -EWOULDBLOCK)) {
607 /* Failed to initiate the speed change, likely the fsm
608 * is still busy (pretty unlikely, but...)
609 * We refuse to accept the skb and return with the queue
610 * stopped so the network layer will retry after the
611 * fsm completes and wakes the queue.
612 */
5b548140 613 return NETDEV_TX_BUSY;
1da177e4
LT		 614 }
615 else if (unlikely(err)) {
616 /* other fatal error - forget the speed change and
617 * hope the stack will recover somehow
618 */
619 netif_start_queue(ndev);
620 }
621 /* else: success
622 * speed change in progress now
623 * on completion the queue gets restarted
624 */
625
626 dev_kfree_skb_any(skb);
6ed10654 627 return NETDEV_TX_OK;
1da177e4
LT		 628 } else
629 dev->new_speed = speed;
630 }
631
632 /* Init tx buffer*/
633 dev->tx_buff.data = dev->tx_buff.head;
634
635 /* Check problems */
636 if(spin_is_locked(&dev->tx_lock)) {
a97a6f10 637 IRDA_DEBUG(3, "%s(), write not completed\n", __func__);
1da177e4
LT		 638 }
639
640 /* serialize with write completion */
641 spin_lock_irqsave(&dev->tx_lock, flags);
642
643 /* Copy skb to tx_buff while wrapping, stuffing and making CRC */
644 dev->tx_buff.len = async_wrap_skb(skb, dev->tx_buff.data, dev->tx_buff.truesize);
645
646 /* transmission will start now - disable receive.
647 * if we are just in the middle of an incoming frame,
648 * treat it as collision. probably it's a good idea to
649 * reset the rx_buf OUTSIDE_FRAME in this case too?
650 */
651 atomic_set(&dev->enable_rx, 0);
652 if (unlikely(sirdev_is_receiving(dev)))
af049081 653 dev->netdev->stats.collisions++;
1da177e4
LT		 654
655 actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
656
657 if (likely(actual > 0)) {
658 dev->tx_skb = skb;
1da177e4
LT		 659 dev->tx_buff.data += actual;
660 dev->tx_buff.len -= actual;
661 }
662 else if (unlikely(actual < 0)) {
663 /* could be dropped later when we have tx_timeout to recover */
664 IRDA_ERROR("%s: drv->do_write failed (%d)\n",
a97a6f10 665 __func__, actual);
1da177e4 666 dev_kfree_skb_any(skb);
af049081
SH		 667 dev->netdev->stats.tx_errors++;
668 dev->netdev->stats.tx_dropped++;
1da177e4
LT		 669 netif_wake_queue(ndev);
670 }
671 spin_unlock_irqrestore(&dev->tx_lock, flags);
672
6ed10654 673 return NETDEV_TX_OK;
1da177e4
LT		 674}
675
676/* called from network layer with rtnl hold */
677
678static int sirdev_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
679{
680 struct if_irda_req *irq = (struct if_irda_req *) rq;
4cf1653a 681 struct sir_dev *dev = netdev_priv(ndev);
1da177e4
LT		 682 int ret = 0;
683
684 IRDA_ASSERT(dev != NULL, return -1;);
685
a97a6f10 686 IRDA_DEBUG(3, "%s(), %s, (cmd=0x%X)\n", __func__, ndev->name, cmd);
1da177e4
LT		 687
688 switch (cmd) {
689 case SIOCSBANDWIDTH: /* Set bandwidth */
690 if (!capable(CAP_NET_ADMIN))
691 ret = -EPERM;
692 else
693 ret = sirdev_schedule_speed(dev, irq->ifr_baudrate);
694 /* cannot sleep here for completion
695 * we are called from network layer with rtnl hold
696 */
697 break;
698
699 case SIOCSDONGLE: /* Set dongle */
700 if (!capable(CAP_NET_ADMIN))
701 ret = -EPERM;
702 else
703 ret = sirdev_schedule_dongle_open(dev, irq->ifr_dongle);
704 /* cannot sleep here for completion
705 * we are called from network layer with rtnl hold
706 */
707 break;
708
709 case SIOCSMEDIABUSY: /* Set media busy */
710 if (!capable(CAP_NET_ADMIN))
711 ret = -EPERM;
712 else
713 irda_device_set_media_busy(dev->netdev, TRUE);
714 break;
715
716 case SIOCGRECEIVING: /* Check if we are receiving right now */
717 irq->ifr_receiving = sirdev_is_receiving(dev);
718 break;
719
720 case SIOCSDTRRTS:
721 if (!capable(CAP_NET_ADMIN))
722 ret = -EPERM;
723 else
724 ret = sirdev_schedule_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts);
725 /* cannot sleep here for completion
726 * we are called from network layer with rtnl hold
727 */
728 break;
729
730 case SIOCSMODE:
731#if 0
732 if (!capable(CAP_NET_ADMIN))
733 ret = -EPERM;
734 else
735 ret = sirdev_schedule_mode(dev, irq->ifr_mode);
736 /* cannot sleep here for completion
737 * we are called from network layer with rtnl hold
738 */
739 break;
740#endif
741 default:
742 ret = -EOPNOTSUPP;
743 }
744
745 return ret;
746}
747
748/* ----------------------------------------------------------------------------- */
749
750#define SIRBUF_ALLOCSIZE 4269 /* worst case size of a wrapped IrLAP frame */
751
752static int sirdev_alloc_buffers(struct sir_dev *dev)
753{
754 dev->tx_buff.truesize = SIRBUF_ALLOCSIZE;
755 dev->rx_buff.truesize = IRDA_SKB_MAX_MTU;
756
757 /* Bootstrap ZeroCopy Rx */
e4e90b21
DM		 758 dev->rx_buff.skb = __netdev_alloc_skb(dev->netdev, dev->rx_buff.truesize,
759 GFP_KERNEL);
1da177e4
LT		 760 if (dev->rx_buff.skb == NULL)
761 return -ENOMEM;
762 skb_reserve(dev->rx_buff.skb, 1);
763 dev->rx_buff.head = dev->rx_buff.skb->data;
764
765 dev->tx_buff.head = kmalloc(dev->tx_buff.truesize, GFP_KERNEL);
766 if (dev->tx_buff.head == NULL) {
767 kfree_skb(dev->rx_buff.skb);
768 dev->rx_buff.skb = NULL;
769 dev->rx_buff.head = NULL;
770 return -ENOMEM;
771 }
772
773 dev->tx_buff.data = dev->tx_buff.head;
774 dev->rx_buff.data = dev->rx_buff.head;
775 dev->tx_buff.len = 0;
776 dev->rx_buff.len = 0;
777
778 dev->rx_buff.in_frame = FALSE;
779 dev->rx_buff.state = OUTSIDE_FRAME;
780 return 0;
781};
782
783static void sirdev_free_buffers(struct sir_dev *dev)
784{
875b4829 785 kfree_skb(dev->rx_buff.skb);
b4558ea9 786 kfree(dev->tx_buff.head);
1da177e4
LT		 787 dev->rx_buff.head = dev->tx_buff.head = NULL;
788 dev->rx_buff.skb = NULL;
789}
790
791static int sirdev_open(struct net_device *ndev)
792{
4cf1653a 793 struct sir_dev *dev = netdev_priv(ndev);
1da177e4
LT		 794 const struct sir_driver *drv = dev->drv;
795
796 if (!drv)
797 return -ENODEV;
798
799 /* increase the reference count of the driver module before doing serious stuff */
800 if (!try_module_get(drv->owner))
801 return -ESTALE;
802
a97a6f10 803 IRDA_DEBUG(2, "%s()\n", __func__);
1da177e4
LT		 804
805 if (sirdev_alloc_buffers(dev))
806 goto errout_dec;
807
808 if (!dev->drv->start_dev || dev->drv->start_dev(dev))
809 goto errout_free;
810
811 sirdev_enable_rx(dev);
812 dev->raw_tx = 0;
813
814 netif_start_queue(ndev);
815 dev->irlap = irlap_open(ndev, &dev->qos, dev->hwname);
816 if (!dev->irlap)
817 goto errout_stop;
818
819 netif_wake_queue(ndev);
820
a97a6f10 821 IRDA_DEBUG(2, "%s - done, speed = %d\n", __func__, dev->speed);
1da177e4
LT		 822
823 return 0;
824
825errout_stop:
826 atomic_set(&dev->enable_rx, 0);
827 if (dev->drv->stop_dev)
828 dev->drv->stop_dev(dev);
829errout_free:
830 sirdev_free_buffers(dev);
831errout_dec:
832 module_put(drv->owner);
833 return -EAGAIN;
834}
835
836static int sirdev_close(struct net_device *ndev)
837{
4cf1653a 838 struct sir_dev *dev = netdev_priv(ndev);
1da177e4
LT		 839 const struct sir_driver *drv;
840
a97a6f10 841// IRDA_DEBUG(0, "%s\n", __func__);
1da177e4
LT		 842
843 netif_stop_queue(ndev);
844
845 down(&dev->fsm.sem); /* block on pending config completion */
846
847 atomic_set(&dev->enable_rx, 0);
848
849 if (unlikely(!dev->irlap))
850 goto out;
851 irlap_close(dev->irlap);
852 dev->irlap = NULL;
853
854 drv = dev->drv;
855 if (unlikely(!drv || !dev->priv))
856 goto out;
857
858 if (drv->stop_dev)
859 drv->stop_dev(dev);
860
861 sirdev_free_buffers(dev);
862 module_put(drv->owner);
863
864out:
865 dev->speed = 0;
866 up(&dev->fsm.sem);
867 return 0;
868}
869
2b023f46
SH		 870static const struct net_device_ops sirdev_ops = {
871 .ndo_start_xmit = sirdev_hard_xmit,
872 .ndo_open = sirdev_open,
873 .ndo_stop = sirdev_close,
874 .ndo_do_ioctl = sirdev_ioctl,
875};
1da177e4
LT		 876/* ----------------------------------------------------------------------------- */
877
878struct sir_dev * sirdev_get_instance(const struct sir_driver *drv, const char *name)
879{
880 struct net_device *ndev;
881 struct sir_dev *dev;
882
a97a6f10 883 IRDA_DEBUG(0, "%s - %s\n", __func__, name);
1da177e4
LT		 884
885 /* instead of adding tests to protect against drv->do_write==NULL
886 * at several places we refuse to create a sir_dev instance for
887 * drivers which don't implement do_write.
888 */
889 if (!drv || !drv->do_write)
890 return NULL;
891
892 /*
893 * Allocate new instance of the device
894 */
895 ndev = alloc_irdadev(sizeof(*dev));
896 if (ndev == NULL) {
a97a6f10 897 IRDA_ERROR("%s - Can't allocate memory for IrDA control block!\n", __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)) {
a97a6f10 922 IRDA_ERROR("%s(), register_netdev() failed!\n", __func__);
1da177e4
LT		 923 goto out_freenetdev;
924 }
925
926 return dev;
927
928out_freenetdev:
929 free_netdev(ndev);
930out:
931 return NULL;
932}
214ad784 933EXPORT_SYMBOL(sirdev_get_instance);
1da177e4
LT		 934
935int sirdev_put_instance(struct sir_dev *dev)
936{
937 int err = 0;
938
a97a6f10 939 IRDA_DEBUG(0, "%s\n", __func__);
1da177e4
LT		 940
941 atomic_set(&dev->enable_rx, 0);
942
943 netif_carrier_off(dev->netdev);
944 netif_device_detach(dev->netdev);
945
946 if (dev->dongle_drv)
947 err = sirdev_schedule_dongle_close(dev);
948 if (err)
a97a6f10 949 IRDA_ERROR("%s - error %d\n", __func__, err);
1da177e4
LT		 950
951 sirdev_close(dev->netdev);
952
953 down(&dev->fsm.sem);
954 dev->fsm.state = SIRDEV_STATE_DEAD; /* mark staled */
955 dev->dongle_drv = NULL;
956 dev->priv = NULL;
957 up(&dev->fsm.sem);
958
959 /* Remove netdevice */
960 unregister_netdev(dev->netdev);
961
962 free_netdev(dev->netdev);
963
964 return 0;
965}
214ad784 966EXPORT_SYMBOL(sirdev_put_instance);
1da177e4 967
788252e6
CH		 968static int __init sir_wq_init(void)
969{
970 irda_sir_wq = create_singlethread_workqueue("irda_sir_wq");
971 if (!irda_sir_wq)
972 return -ENOMEM;
973 return 0;
974}
975
976static void __exit sir_wq_exit(void)
977{
978 destroy_workqueue(irda_sir_wq);
979}
980
981module_init(sir_wq_init);
982module_exit(sir_wq_exit);
983
984MODULE_AUTHOR("Martin Diehl <info@mdiehl.de>");
985MODULE_DESCRIPTION("IrDA SIR core");
986MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)