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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[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
14#include <linux/module.h>
15#include <linux/kernel.h>
5a0e3ad6 16#include <linux/slab.h>
1da177e4 17#include <linux/init.h>
1da177e4
LT		 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
788252e6
CH		 26
27static struct workqueue_struct *irda_sir_wq;
28
29/* STATE MACHINE */
30
31/* substate handler of the config-fsm to handle the cases where we want
32 * to wait for transmit completion before changing the port configuration
33 */
34
35static int sirdev_tx_complete_fsm(struct sir_dev *dev)
36{
37 struct sir_fsm *fsm = &dev->fsm;
38 unsigned next_state, delay;
39 unsigned bytes_left;
40
41 do {
42 next_state = fsm->substate; /* default: stay in current substate */
43 delay = 0;
44
45 switch(fsm->substate) {
46
47 case SIRDEV_STATE_WAIT_XMIT:
48 if (dev->drv->chars_in_buffer)
49 bytes_left = dev->drv->chars_in_buffer(dev);
50 else
51 bytes_left = 0;
52 if (!bytes_left) {
53 next_state = SIRDEV_STATE_WAIT_UNTIL_SENT;
54 break;
55 }
56
57 if (dev->speed > 115200)
58 delay = (bytes_left*8*10000) / (dev->speed/100);
59 else if (dev->speed > 0)
60 delay = (bytes_left*10*10000) / (dev->speed/100);
61 else
62 delay = 0;
63 /* expected delay (usec) until remaining bytes are sent */
64 if (delay < 100) {
65 udelay(delay);
66 delay = 0;
67 break;
68 }
69 /* sleep some longer delay (msec) */
70 delay = (delay+999) / 1000;
71 break;
72
73 case SIRDEV_STATE_WAIT_UNTIL_SENT:
74 /* block until underlaying hardware buffer are empty */
75 if (dev->drv->wait_until_sent)
76 dev->drv->wait_until_sent(dev);
77 next_state = SIRDEV_STATE_TX_DONE;
78 break;
79
80 case SIRDEV_STATE_TX_DONE:
81 return 0;
82
83 default:
a97a6f10 84 IRDA_ERROR("%s - undefined state\n", __func__);
788252e6
CH		 85 return -EINVAL;
86 }
87 fsm->substate = next_state;
88 } while (delay == 0);
89 return delay;
90}
91
92/*
93 * Function sirdev_config_fsm
94 *
95 * State machine to handle the configuration of the device (and attached dongle, if any).
96 * This handler is scheduled for execution in kIrDAd context, so we can sleep.
97 * however, kIrDAd is shared by all sir_dev devices so we better don't sleep there too
98 * long. Instead, for longer delays we start a timer to reschedule us later.
99 * On entry, fsm->sem is always locked and the netdev xmit queue stopped.
100 * Both must be unlocked/restarted on completion - but only on final exit.
101 */
102
c4028958 103static void sirdev_config_fsm(struct work_struct *work)
788252e6 104{
c4028958 105 struct sir_dev *dev = container_of(work, struct sir_dev, fsm.work.work);
788252e6
CH		 106 struct sir_fsm *fsm = &dev->fsm;
107 int next_state;
108 int ret = -1;
109 unsigned delay;
110
a97a6f10 111 IRDA_DEBUG(2, "%s(), <%ld>\n", __func__, jiffies);
788252e6
CH		 112
113 do {
114 IRDA_DEBUG(3, "%s - state=0x%04x / substate=0x%04x\n",
a97a6f10 115 __func__, fsm->state, fsm->substate);
788252e6
CH		 116
117 next_state = fsm->state;
118 delay = 0;
119
120 switch(fsm->state) {
121
122 case SIRDEV_STATE_DONGLE_OPEN:
123 if (dev->dongle_drv != NULL) {
124 ret = sirdev_put_dongle(dev);
125 if (ret) {
126 fsm->result = -EINVAL;
127 next_state = SIRDEV_STATE_ERROR;
128 break;
129 }
130 }
131
132 /* Initialize dongle */
133 ret = sirdev_get_dongle(dev, fsm->param);
134 if (ret) {
135 fsm->result = ret;
136 next_state = SIRDEV_STATE_ERROR;
137 break;
138 }
139
140 /* Dongles are powered through the modem control lines which
141 * were just set during open. Before resetting, let's wait for
142 * the power to stabilize. This is what some dongle drivers did
143 * in open before, while others didn't - should be safe anyway.
144 */
145
146 delay = 50;
147 fsm->substate = SIRDEV_STATE_DONGLE_RESET;
148 next_state = SIRDEV_STATE_DONGLE_RESET;
149
150 fsm->param = 9600;
151
152 break;
153
154 case SIRDEV_STATE_DONGLE_CLOSE:
155 /* shouldn't we just treat this as success=? */
156 if (dev->dongle_drv == NULL) {
157 fsm->result = -EINVAL;
158 next_state = SIRDEV_STATE_ERROR;
159 break;
160 }
161
162 ret = sirdev_put_dongle(dev);
163 if (ret) {
164 fsm->result = ret;
165 next_state = SIRDEV_STATE_ERROR;
166 break;
167 }
168 next_state = SIRDEV_STATE_DONE;
169 break;
170
171 case SIRDEV_STATE_SET_DTR_RTS:
172 ret = sirdev_set_dtr_rts(dev,
173 (fsm->param&0x02) ? TRUE : FALSE,
174 (fsm->param&0x01) ? TRUE : FALSE);
175 next_state = SIRDEV_STATE_DONE;
176 break;
177
178 case SIRDEV_STATE_SET_SPEED:
179 fsm->substate = SIRDEV_STATE_WAIT_XMIT;
180 next_state = SIRDEV_STATE_DONGLE_CHECK;
181 break;
182
183 case SIRDEV_STATE_DONGLE_CHECK:
184 ret = sirdev_tx_complete_fsm(dev);
185 if (ret < 0) {
186 fsm->result = ret;
187 next_state = SIRDEV_STATE_ERROR;
188 break;
189 }
190 if ((delay=ret) != 0)
191 break;
192
193 if (dev->dongle_drv) {
194 fsm->substate = SIRDEV_STATE_DONGLE_RESET;
195 next_state = SIRDEV_STATE_DONGLE_RESET;
196 }
197 else {
198 dev->speed = fsm->param;
199 next_state = SIRDEV_STATE_PORT_SPEED;
200 }
201 break;
202
203 case SIRDEV_STATE_DONGLE_RESET:
204 if (dev->dongle_drv->reset) {
205 ret = dev->dongle_drv->reset(dev);
206 if (ret < 0) {
207 fsm->result = ret;
208 next_state = SIRDEV_STATE_ERROR;
209 break;
210 }
211 }
212 else
213 ret = 0;
214 if ((delay=ret) == 0) {
215 /* set serial port according to dongle default speed */
216 if (dev->drv->set_speed)
217 dev->drv->set_speed(dev, dev->speed);
218 fsm->substate = SIRDEV_STATE_DONGLE_SPEED;
219 next_state = SIRDEV_STATE_DONGLE_SPEED;
220 }
221 break;
222
223 case SIRDEV_STATE_DONGLE_SPEED:
224 if (dev->dongle_drv->reset) {
225 ret = dev->dongle_drv->set_speed(dev, fsm->param);
226 if (ret < 0) {
227 fsm->result = ret;
228 next_state = SIRDEV_STATE_ERROR;
229 break;
230 }
231 }
232 else
233 ret = 0;
234 if ((delay=ret) == 0)
235 next_state = SIRDEV_STATE_PORT_SPEED;
236 break;
237
238 case SIRDEV_STATE_PORT_SPEED:
239 /* Finally we are ready to change the serial port speed */
240 if (dev->drv->set_speed)
241 dev->drv->set_speed(dev, dev->speed);
242 dev->new_speed = 0;
243 next_state = SIRDEV_STATE_DONE;
244 break;
245
246 case SIRDEV_STATE_DONE:
247 /* Signal network layer so it can send more frames */
248 netif_wake_queue(dev->netdev);
249 next_state = SIRDEV_STATE_COMPLETE;
250 break;
251
252 default:
a97a6f10 253 IRDA_ERROR("%s - undefined state\n", __func__);
788252e6
CH		 254 fsm->result = -EINVAL;
255 /* fall thru */
256
257 case SIRDEV_STATE_ERROR:
a97a6f10 258 IRDA_ERROR("%s - error: %d\n", __func__, fsm->result);
788252e6
CH		 259
260#if 0 /* don't enable this before we have netdev->tx_timeout to recover */
261 netif_stop_queue(dev->netdev);
262#else
263 netif_wake_queue(dev->netdev);
264#endif
265 /* fall thru */
266
267 case SIRDEV_STATE_COMPLETE:
268 /* config change finished, so we are not busy any longer */
269 sirdev_enable_rx(dev);
270 up(&fsm->sem);
271 return;
272 }
273 fsm->state = next_state;
274 } while(!delay);
275
276 queue_delayed_work(irda_sir_wq, &fsm->work, msecs_to_jiffies(delay));
277}
278
279/* schedule some device configuration task for execution by kIrDAd
280 * on behalf of the above state machine.
281 * can be called from process or interrupt/tasklet context.
282 */
283
284int sirdev_schedule_request(struct sir_dev *dev, int initial_state, unsigned param)
285{
286 struct sir_fsm *fsm = &dev->fsm;
287
a97a6f10
HH		 288 IRDA_DEBUG(2, "%s - state=0x%04x / param=%u\n", __func__,
289 initial_state, param);
788252e6
CH		 290
291 if (down_trylock(&fsm->sem)) {
292 if (in_interrupt() || in_atomic() || irqs_disabled()) {
a97a6f10 293 IRDA_DEBUG(1, "%s(), state machine busy!\n", __func__);
788252e6
CH		 294 return -EWOULDBLOCK;
295 } else
296 down(&fsm->sem);
297 }
298
299 if (fsm->state == SIRDEV_STATE_DEAD) {
300 /* race with sirdev_close should never happen */
a97a6f10 301 IRDA_ERROR("%s(), instance staled!\n", __func__);
788252e6
CH		 302 up(&fsm->sem);
303 return -ESTALE; /* or better EPIPE? */
304 }
305
306 netif_stop_queue(dev->netdev);
307 atomic_set(&dev->enable_rx, 0);
308
309 fsm->state = initial_state;
310 fsm->param = param;
311 fsm->result = 0;
312
c4028958
DH		 313 INIT_DELAYED_WORK(&fsm->work, sirdev_config_fsm);
314 queue_delayed_work(irda_sir_wq, &fsm->work, 0);
788252e6
CH		 315 return 0;
316}
317
318
1da177e4
LT		 319/***************************************************************************/
320
321void sirdev_enable_rx(struct sir_dev *dev)
322{
323 if (unlikely(atomic_read(&dev->enable_rx)))
324 return;
325
326 /* flush rx-buffer - should also help in case of problems with echo cancelation */
327 dev->rx_buff.data = dev->rx_buff.head;
328 dev->rx_buff.len = 0;
329 dev->rx_buff.in_frame = FALSE;
330 dev->rx_buff.state = OUTSIDE_FRAME;
331 atomic_set(&dev->enable_rx, 1);
332}
333
334static int sirdev_is_receiving(struct sir_dev *dev)
335{
336 if (!atomic_read(&dev->enable_rx))
337 return 0;
338
339 return (dev->rx_buff.state != OUTSIDE_FRAME);
340}
341
342int sirdev_set_dongle(struct sir_dev *dev, IRDA_DONGLE type)
343{
344 int err;
345
a97a6f10 346 IRDA_DEBUG(3, "%s : requesting dongle %d.\n", __func__, type);
1da177e4
LT		 347
348 err = sirdev_schedule_dongle_open(dev, type);
349 if (unlikely(err))
350 return err;
351 down(&dev->fsm.sem); /* block until config change completed */
352 err = dev->fsm.result;
353 up(&dev->fsm.sem);
354 return err;
355}
214ad784 356EXPORT_SYMBOL(sirdev_set_dongle);
1da177e4
LT		 357
358/* used by dongle drivers for dongle programming */
359
360int sirdev_raw_write(struct sir_dev *dev, const char *buf, int len)
361{
362 unsigned long flags;
363 int ret;
364
365 if (unlikely(len > dev->tx_buff.truesize))
366 return -ENOSPC;
367
368 spin_lock_irqsave(&dev->tx_lock, flags); /* serialize with other tx operations */
369 while (dev->tx_buff.len > 0) { /* wait until tx idle */
370 spin_unlock_irqrestore(&dev->tx_lock, flags);
371 msleep(10);
372 spin_lock_irqsave(&dev->tx_lock, flags);
373 }
374
375 dev->tx_buff.data = dev->tx_buff.head;
376 memcpy(dev->tx_buff.data, buf, len);
377 dev->tx_buff.len = len;
378
379 ret = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
380 if (ret > 0) {
a97a6f10 381 IRDA_DEBUG(3, "%s(), raw-tx started\n", __func__);
1da177e4
LT		 382
383 dev->tx_buff.data += ret;
384 dev->tx_buff.len -= ret;
385 dev->raw_tx = 1;
386 ret = len; /* all data is going to be sent */
387 }
388 spin_unlock_irqrestore(&dev->tx_lock, flags);
389 return ret;
390}
214ad784 391EXPORT_SYMBOL(sirdev_raw_write);
1da177e4
LT		 392
393/* seems some dongle drivers may need this */
394
395int sirdev_raw_read(struct sir_dev *dev, char *buf, int len)
396{
397 int count;
398
399 if (atomic_read(&dev->enable_rx))
400 return -EIO; /* fail if we expect irda-frames */
401
402 count = (len < dev->rx_buff.len) ? len : dev->rx_buff.len;
403
404 if (count > 0) {
405 memcpy(buf, dev->rx_buff.data, count);
406 dev->rx_buff.data += count;
407 dev->rx_buff.len -= count;
408 }
409
410 /* remaining stuff gets flushed when re-enabling normal rx */
411
412 return count;
413}
214ad784 414EXPORT_SYMBOL(sirdev_raw_read);
1da177e4
LT		 415
416int sirdev_set_dtr_rts(struct sir_dev *dev, int dtr, int rts)
417{
418 int ret = -ENXIO;
37e1370b 419 if (dev->drv->set_dtr_rts)
1da177e4
LT		 420 ret = dev->drv->set_dtr_rts(dev, dtr, rts);
421 return ret;
422}
214ad784
AB		 423EXPORT_SYMBOL(sirdev_set_dtr_rts);
424
1da177e4
LT		 425/**********************************************************************/
426
427/* called from client driver - likely with bh-context - to indicate
428 * it made some progress with transmission. Hence we send the next
429 * chunk, if any, or complete the skb otherwise
430 */
431
432void sirdev_write_complete(struct sir_dev *dev)
433{
434 unsigned long flags;
435 struct sk_buff *skb;
436 int actual = 0;
437 int err;
438
439 spin_lock_irqsave(&dev->tx_lock, flags);
440
441 IRDA_DEBUG(3, "%s() - dev->tx_buff.len = %d\n",
a97a6f10 442 __func__, dev->tx_buff.len);
1da177e4
LT		 443
444 if (likely(dev->tx_buff.len > 0)) {
445 /* Write data left in transmit buffer */
446 actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
447
448 if (likely(actual>0)) {
449 dev->tx_buff.data += actual;
450 dev->tx_buff.len -= actual;
451 }
452 else if (unlikely(actual<0)) {
453 /* could be dropped later when we have tx_timeout to recover */
454 IRDA_ERROR("%s: drv->do_write failed (%d)\n",
a97a6f10 455 __func__, actual);
1da177e4
LT		 456 if ((skb=dev->tx_skb) != NULL) {
457 dev->tx_skb = NULL;
458 dev_kfree_skb_any(skb);
af049081
SH		 459 dev->netdev->stats.tx_errors++;
460 dev->netdev->stats.tx_dropped++;
1da177e4
LT		 461 }
462 dev->tx_buff.len = 0;
463 }
464 if (dev->tx_buff.len > 0)
465 goto done; /* more data to send later */
466 }
467
468 if (unlikely(dev->raw_tx != 0)) {
469 /* in raw mode we are just done now after the buffer was sent
470 * completely. Since this was requested by some dongle driver
471 * running under the control of the irda-thread we must take
472 * care here not to re-enable the queue. The queue will be
473 * restarted when the irda-thread has completed the request.
474 */
475
a97a6f10 476 IRDA_DEBUG(3, "%s(), raw-tx done\n", __func__);
1da177e4
LT		 477 dev->raw_tx = 0;
478 goto done; /* no post-frame handling in raw mode */
479 }
480
481 /* we have finished now sending this skb.
482 * update statistics and free the skb.
483 * finally we check and trigger a pending speed change, if any.
484 * if not we switch to rx mode and wake the queue for further
485 * packets.
486 * note the scheduled speed request blocks until the lower
487 * client driver and the corresponding hardware has really
488 * finished sending all data (xmit fifo drained f.e.)
489 * before the speed change gets finally done and the queue
490 * re-activated.
491 */
492
a97a6f10 493 IRDA_DEBUG(5, "%s(), finished with frame!\n", __func__);
1da177e4
LT		 494
495 if ((skb=dev->tx_skb) != NULL) {
496 dev->tx_skb = NULL;
af049081
SH		 497 dev->netdev->stats.tx_packets++;
498 dev->netdev->stats.tx_bytes += skb->len;
1da177e4
LT		 499 dev_kfree_skb_any(skb);
500 }
501
502 if (unlikely(dev->new_speed > 0)) {
a97a6f10 503 IRDA_DEBUG(5, "%s(), Changing speed!\n", __func__);
1da177e4
LT		 504 err = sirdev_schedule_speed(dev, dev->new_speed);
505 if (unlikely(err)) {
506 /* should never happen
507 * forget the speed change and hope the stack recovers
508 */
509 IRDA_ERROR("%s - schedule speed change failed: %d\n",
a97a6f10 510 __func__, err);
1da177e4
LT		 511 netif_wake_queue(dev->netdev);
512 }
513 /* else: success
514 * speed change in progress now
515 * on completion dev->new_speed gets cleared,
516 * rx-reenabled and the queue restarted
517 */
518 }
519 else {
520 sirdev_enable_rx(dev);
521 netif_wake_queue(dev->netdev);
522 }
523
524done:
525 spin_unlock_irqrestore(&dev->tx_lock, flags);
526}
214ad784 527EXPORT_SYMBOL(sirdev_write_complete);
1da177e4
LT		 528
529/* called from client driver - likely with bh-context - to give us
530 * some more received bytes. We put them into the rx-buffer,
531 * normally unwrapping and building LAP-skb's (unless rx disabled)
532 */
533
534int sirdev_receive(struct sir_dev *dev, const unsigned char *cp, size_t count)
535{
536 if (!dev || !dev->netdev) {
a97a6f10 537 IRDA_WARNING("%s(), not ready yet!\n", __func__);
1da177e4
LT		 538 return -1;
539 }
540
541 if (!dev->irlap) {
542 IRDA_WARNING("%s - too early: %p / %zd!\n",
a97a6f10 543 __func__, cp, count);
1da177e4
LT		 544 return -1;
545 }
546
547 if (cp==NULL) {
548 /* error already at lower level receive
549 * just update stats and set media busy
550 */
551 irda_device_set_media_busy(dev->netdev, TRUE);
af049081 552 dev->netdev->stats.rx_dropped++;
a97a6f10 553 IRDA_DEBUG(0, "%s; rx-drop: %zd\n", __func__, count);
1da177e4
LT		 554 return 0;
555 }
556
557 /* Read the characters into the buffer */
558 if (likely(atomic_read(&dev->enable_rx))) {
559 while (count--)
560 /* Unwrap and destuff one byte */
af049081 561 async_unwrap_char(dev->netdev, &dev->netdev->stats,
1da177e4
LT		 562 &dev->rx_buff, *cp++);
563 } else {
564 while (count--) {
565 /* rx not enabled: save the raw bytes and never
566 * trigger any netif_rx. The received bytes are flushed
567 * later when we re-enable rx but might be read meanwhile
568 * by the dongle driver.
569 */
570 dev->rx_buff.data[dev->rx_buff.len++] = *cp++;
571
572 /* What should we do when the buffer is full? */
573 if (unlikely(dev->rx_buff.len == dev->rx_buff.truesize))
574 dev->rx_buff.len = 0;
575 }
576 }
577
578 return 0;
579}
214ad784 580EXPORT_SYMBOL(sirdev_receive);
1da177e4
LT		 581
582/**********************************************************************/
583
584/* callbacks from network layer */
585
6518bbb8
SH		 586static netdev_tx_t sirdev_hard_xmit(struct sk_buff *skb,
587 struct net_device *ndev)
1da177e4 588{
4cf1653a 589 struct sir_dev *dev = netdev_priv(ndev);
1da177e4
LT		 590 unsigned long flags;
591 int actual = 0;
592 int err;
593 s32 speed;
594
ec634fe3 595 IRDA_ASSERT(dev != NULL, return NETDEV_TX_OK;);
1da177e4
LT		 596
597 netif_stop_queue(ndev);
598
a97a6f10 599 IRDA_DEBUG(3, "%s(), skb->len = %d\n", __func__, skb->len);
1da177e4
LT		 600
601 speed = irda_get_next_speed(skb);
602 if ((speed != dev->speed) && (speed != -1)) {
603 if (!skb->len) {
604 err = sirdev_schedule_speed(dev, speed);
605 if (unlikely(err == -EWOULDBLOCK)) {
606 /* Failed to initiate the speed change, likely the fsm
607 * is still busy (pretty unlikely, but...)
608 * We refuse to accept the skb and return with the queue
609 * stopped so the network layer will retry after the
610 * fsm completes and wakes the queue.
611 */
5b548140 612 return NETDEV_TX_BUSY;
1da177e4
LT		 613 }
614 else if (unlikely(err)) {
615 /* other fatal error - forget the speed change and
616 * hope the stack will recover somehow
617 */
618 netif_start_queue(ndev);
619 }
620 /* else: success
621 * speed change in progress now
622 * on completion the queue gets restarted
623 */
624
625 dev_kfree_skb_any(skb);
6ed10654 626 return NETDEV_TX_OK;
1da177e4
LT		 627 } else
628 dev->new_speed = speed;
629 }
630
631 /* Init tx buffer*/
632 dev->tx_buff.data = dev->tx_buff.head;
633
634 /* Check problems */
635 if(spin_is_locked(&dev->tx_lock)) {
a97a6f10 636 IRDA_DEBUG(3, "%s(), write not completed\n", __func__);
1da177e4
LT		 637 }
638
639 /* serialize with write completion */
640 spin_lock_irqsave(&dev->tx_lock, flags);
641
642 /* Copy skb to tx_buff while wrapping, stuffing and making CRC */
643 dev->tx_buff.len = async_wrap_skb(skb, dev->tx_buff.data, dev->tx_buff.truesize);
644
645 /* transmission will start now - disable receive.
646 * if we are just in the middle of an incoming frame,
647 * treat it as collision. probably it's a good idea to
648 * reset the rx_buf OUTSIDE_FRAME in this case too?
649 */
650 atomic_set(&dev->enable_rx, 0);
651 if (unlikely(sirdev_is_receiving(dev)))
af049081 652 dev->netdev->stats.collisions++;
1da177e4
LT		 653
654 actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
655
656 if (likely(actual > 0)) {
657 dev->tx_skb = skb;
658 ndev->trans_start = jiffies;
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);
913 init_MUTEX(&dev->fsm.sem);
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)