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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / net / hamradio / hdlcdrv.c
blob97e3bc60c3e7d111184f4c60ce4afe50757d1398
1 /*****************************************************************************/
2
3 /*
4 * hdlcdrv.c -- HDLC packet radio network driver.
5 *
6 * Copyright (C) 1996-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * Please note that the GPL allows you to use the driver, NOT the radio.
23 * In order to use the radio, you need a license from the communications
24 * authority of your country.
25 *
26 * The driver was derived from Donald Beckers skeleton.c
27 * Written 1993-94 by Donald Becker.
28 *
29 * History:
30 * 0.1 21.09.1996 Started
31 * 18.10.1996 Changed to new user space access routines
32 * (copy_{to,from}_user)
33 * 0.2 21.11.1996 various small changes
34 * 0.3 03.03.1997 fixed (hopefully) IP not working with ax.25 as a module
35 * 0.4 16.04.1997 init code/data tagged
36 * 0.5 30.07.1997 made HDLC buffers bigger (solves a problem with the
37 * soundmodem driver)
38 * 0.6 05.04.1998 add spinlocks
39 * 0.7 03.08.1999 removed some old compatibility cruft
40 * 0.8 12.02.2000 adapted to softnet driver interface
41 */
42
43 /*****************************************************************************/
44
45 #include <linux/capability.h>
46 #include <linux/module.h>
47 #include <linux/types.h>
48 #include <linux/net.h>
49 #include <linux/in.h>
50 #include <linux/if.h>
51 #include <linux/errno.h>
52 #include <linux/init.h>
53 #include <linux/bitops.h>
54
55 #include <linux/netdevice.h>
56 #include <linux/if_arp.h>
57 #include <linux/skbuff.h>
58 #include <linux/hdlcdrv.h>
59 #include <linux/random.h>
60 #include <net/ax25.h>
61 #include <linux/uaccess.h>
62
63 #include <linux/crc-ccitt.h>
64
65 /* --------------------------------------------------------------------- */
66
67 #define KISS_VERBOSE
68
69 /* --------------------------------------------------------------------- */
70
71 #define PARAM_TXDELAY 1
72 #define PARAM_PERSIST 2
73 #define PARAM_SLOTTIME 3
74 #define PARAM_TXTAIL 4
75 #define PARAM_FULLDUP 5
76 #define PARAM_HARDWARE 6
77 #define PARAM_RETURN 255
78
79 /* --------------------------------------------------------------------- */
80 /*
81 * the CRC routines are stolen from WAMPES
82 * by Dieter Deyke
83 */
84
85
86 /*---------------------------------------------------------------------------*/
87
88 static inline void append_crc_ccitt(unsigned char *buffer, int len)
89 {
90 unsigned int crc = crc_ccitt(0xffff, buffer, len) ^ 0xffff;
91 buffer += len;
92 *buffer++ = crc;
93 *buffer++ = crc >> 8;
94 }
95
96 /*---------------------------------------------------------------------------*/
97
98 static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
99 {
100 return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
101 }
102
103 /*---------------------------------------------------------------------------*/
104
105 #if 0
106 static int calc_crc_ccitt(const unsigned char *buf, int cnt)
107 {
108 unsigned int crc = 0xffff;
109
110 for (; cnt > 0; cnt--)
111 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff];
112 crc ^= 0xffff;
113 return crc & 0xffff;
114 }
115 #endif
116
117 /* ---------------------------------------------------------------------- */
118
119 #define tenms_to_2flags(s,tenms) ((tenms * s->par.bitrate) / 100 / 16)
120
121 /* ---------------------------------------------------------------------- */
122 /*
123 * The HDLC routines
124 */
125
126 static int hdlc_rx_add_bytes(struct hdlcdrv_state *s, unsigned int bits,
127 int num)
128 {
129 int added = 0;
130
131 while (s->hdlcrx.rx_state && num >= 8) {
132 if (s->hdlcrx.len >= sizeof(s->hdlcrx.buffer)) {
133 s->hdlcrx.rx_state = 0;
134 return 0;
135 }
136 *s->hdlcrx.bp++ = bits >> (32-num);
137 s->hdlcrx.len++;
138 num -= 8;
139 added += 8;
140 }
141 return added;
142 }
143
144 static void hdlc_rx_flag(struct net_device *dev, struct hdlcdrv_state *s)
145 {
146 struct sk_buff *skb;
147 int pkt_len;
148 unsigned char *cp;
149
150 if (s->hdlcrx.len < 4)
151 return;
152 if (!check_crc_ccitt(s->hdlcrx.buffer, s->hdlcrx.len))
153 return;
154 pkt_len = s->hdlcrx.len - 2 + 1; /* KISS kludge */
155 if (!(skb = dev_alloc_skb(pkt_len))) {
156 printk("%s: memory squeeze, dropping packet\n", dev->name);
157 dev->stats.rx_dropped++;
158 return;
159 }
160 cp = skb_put(skb, pkt_len);
161 *cp++ = 0; /* KISS kludge */
162 memcpy(cp, s->hdlcrx.buffer, pkt_len - 1);
163 skb->protocol = ax25_type_trans(skb, dev);
164 netif_rx(skb);
165 dev->stats.rx_packets++;
166 }
167
168 void hdlcdrv_receiver(struct net_device *dev, struct hdlcdrv_state *s)
169 {
170 int i;
171 unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word;
172
173 if (!s || s->magic != HDLCDRV_MAGIC)
174 return;
175 if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx))
176 return;
177
178 while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) {
179 word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf);
180
181 #ifdef HDLCDRV_DEBUG
182 hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word);
183 #endif /* HDLCDRV_DEBUG */
184 s->hdlcrx.bitstream >>= 16;
185 s->hdlcrx.bitstream |= word << 16;
186 s->hdlcrx.bitbuf >>= 16;
187 s->hdlcrx.bitbuf |= word << 16;
188 s->hdlcrx.numbits += 16;
189 for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00,
190 mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff;
191 i >= 0;
192 i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1,
193 mask5 <<= 1, mask6 = (mask6 << 1) | 1) {
194 if ((s->hdlcrx.bitstream & mask1) == mask1)
195 s->hdlcrx.rx_state = 0; /* abort received */
196 else if ((s->hdlcrx.bitstream & mask2) == mask3) {
197 /* flag received */
198 if (s->hdlcrx.rx_state) {
199 hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf
200 << (8+i),
201 s->hdlcrx.numbits
202 -8-i);
203 hdlc_rx_flag(dev, s);
204 }
205 s->hdlcrx.len = 0;
206 s->hdlcrx.bp = s->hdlcrx.buffer;
207 s->hdlcrx.rx_state = 1;
208 s->hdlcrx.numbits = i;
209 } else if ((s->hdlcrx.bitstream & mask4) == mask5) {
210 /* stuffed bit */
211 s->hdlcrx.numbits--;
212 s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) |
213 ((s->hdlcrx.bitbuf & mask6) << 1);
214 }
215 }
216 s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf,
217 s->hdlcrx.numbits);
218 }
219 clear_bit(0, &s->hdlcrx.in_hdlc_rx);
220 }
221
222 /* ---------------------------------------------------------------------- */
223
224 static inline void do_kiss_params(struct hdlcdrv_state *s,
225 unsigned char *data, unsigned long len)
226 {
227
228 #ifdef KISS_VERBOSE
229 #define PKP(a,b) printk(KERN_INFO "hdlcdrv.c: channel params: " a "\n", b)
230 #else /* KISS_VERBOSE */
231 #define PKP(a,b)
232 #endif /* KISS_VERBOSE */
233
234 if (len < 2)
235 return;
236 switch(data[0]) {
237 case PARAM_TXDELAY:
238 s->ch_params.tx_delay = data[1];
239 PKP("TX delay = %ums", 10 * s->ch_params.tx_delay);
240 break;
241 case PARAM_PERSIST:
242 s->ch_params.ppersist = data[1];
243 PKP("p persistence = %u", s->ch_params.ppersist);
244 break;
245 case PARAM_SLOTTIME:
246 s->ch_params.slottime = data[1];
247 PKP("slot time = %ums", s->ch_params.slottime);
248 break;
249 case PARAM_TXTAIL:
250 s->ch_params.tx_tail = data[1];
251 PKP("TX tail = %ums", s->ch_params.tx_tail);
252 break;
253 case PARAM_FULLDUP:
254 s->ch_params.fulldup = !!data[1];
255 PKP("%s duplex", s->ch_params.fulldup ? "full" : "half");
256 break;
257 default:
258 break;
259 }
260 #undef PKP
261 }
262
263 /* ---------------------------------------------------------------------- */
264
265 void hdlcdrv_transmitter(struct net_device *dev, struct hdlcdrv_state *s)
266 {
267 unsigned int mask1, mask2, mask3;
268 int i;
269 struct sk_buff *skb;
270 int pkt_len;
271
272 if (!s || s->magic != HDLCDRV_MAGIC)
273 return;
274 if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx))
275 return;
276 for (;;) {
277 if (s->hdlctx.numbits >= 16) {
278 if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) {
279 clear_bit(0, &s->hdlctx.in_hdlc_tx);
280 return;
281 }
282 hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf);
283 s->hdlctx.bitbuf >>= 16;
284 s->hdlctx.numbits -= 16;
285 }
286 switch (s->hdlctx.tx_state) {
287 default:
288 clear_bit(0, &s->hdlctx.in_hdlc_tx);
289 return;
290 case 0:
291 case 1:
292 if (s->hdlctx.numflags) {
293 s->hdlctx.numflags--;
294 s->hdlctx.bitbuf |=
295 0x7e7e << s->hdlctx.numbits;
296 s->hdlctx.numbits += 16;
297 break;
298 }
299 if (s->hdlctx.tx_state == 1) {
300 clear_bit(0, &s->hdlctx.in_hdlc_tx);
301 return;
302 }
303 if (!(skb = s->skb)) {
304 int flgs = tenms_to_2flags(s, s->ch_params.tx_tail);
305 if (flgs < 2)
306 flgs = 2;
307 s->hdlctx.tx_state = 1;
308 s->hdlctx.numflags = flgs;
309 break;
310 }
311 s->skb = NULL;
312 netif_wake_queue(dev);
313 pkt_len = skb->len-1; /* strip KISS byte */
314 if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) {
315 s->hdlctx.tx_state = 0;
316 s->hdlctx.numflags = 1;
317 dev_kfree_skb_irq(skb);
318 break;
319 }
320 skb_copy_from_linear_data_offset(skb, 1,
321 s->hdlctx.buffer,
322 pkt_len);
323 dev_kfree_skb_irq(skb);
324 s->hdlctx.bp = s->hdlctx.buffer;
325 append_crc_ccitt(s->hdlctx.buffer, pkt_len);
326 s->hdlctx.len = pkt_len+2; /* the appended CRC */
327 s->hdlctx.tx_state = 2;
328 s->hdlctx.bitstream = 0;
329 dev->stats.tx_packets++;
330 break;
331 case 2:
332 if (!s->hdlctx.len) {
333 s->hdlctx.tx_state = 0;
334 s->hdlctx.numflags = 1;
335 break;
336 }
337 s->hdlctx.len--;
338 s->hdlctx.bitbuf |= *s->hdlctx.bp <<
339 s->hdlctx.numbits;
340 s->hdlctx.bitstream >>= 8;
341 s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16;
342 mask1 = 0x1f000;
343 mask2 = 0x10000;
344 mask3 = 0xffffffff >> (31-s->hdlctx.numbits);
345 s->hdlctx.numbits += 8;
346 for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1,
347 mask3 = (mask3 << 1) | 1) {
348 if ((s->hdlctx.bitstream & mask1) != mask1)
349 continue;
350 s->hdlctx.bitstream &= ~mask2;
351 s->hdlctx.bitbuf =
352 (s->hdlctx.bitbuf & mask3) |
353 ((s->hdlctx.bitbuf &
354 (~mask3)) << 1);
355 s->hdlctx.numbits++;
356 mask3 = (mask3 << 1) | 1;
357 }
358 break;
359 }
360 }
361 }
362
363 /* ---------------------------------------------------------------------- */
364
365 static void start_tx(struct net_device *dev, struct hdlcdrv_state *s)
366 {
367 s->hdlctx.tx_state = 0;
368 s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay);
369 s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0;
370 hdlcdrv_transmitter(dev, s);
371 s->hdlctx.ptt = 1;
372 s->ptt_keyed++;
373 }
374
375 /* ---------------------------------------------------------------------- */
376
377 void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s)
378 {
379 if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb)
380 return;
381 if (s->ch_params.fulldup) {
382 start_tx(dev, s);
383 return;
384 }
385 if (s->hdlcrx.dcd) {
386 s->hdlctx.slotcnt = s->ch_params.slottime;
387 return;
388 }
389 if ((--s->hdlctx.slotcnt) > 0)
390 return;
391 s->hdlctx.slotcnt = s->ch_params.slottime;
392 if ((prandom_u32() % 256) > s->ch_params.ppersist)
393 return;
394 start_tx(dev, s);
395 }
396
397 /* --------------------------------------------------------------------- */
398 /*
399 * ===================== network driver interface =========================
400 */
401
402 static netdev_tx_t hdlcdrv_send_packet(struct sk_buff *skb,
403 struct net_device *dev)
404 {
405 struct hdlcdrv_state *sm = netdev_priv(dev);
406
407 if (skb->protocol == htons(ETH_P_IP))
408 return ax25_ip_xmit(skb);
409
410 if (skb->data[0] != 0) {
411 do_kiss_params(sm, skb->data, skb->len);
412 dev_kfree_skb(skb);
413 return NETDEV_TX_OK;
414 }
415 if (sm->skb) {
416 dev_kfree_skb(skb);
417 return NETDEV_TX_OK;
418 }
419 netif_stop_queue(dev);
420 sm->skb = skb;
421 return NETDEV_TX_OK;
422 }
423
424 /* --------------------------------------------------------------------- */
425
426 static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr)
427 {
428 struct sockaddr *sa = (struct sockaddr *)addr;
429
430 /* addr is an AX.25 shifted ASCII mac address */
431 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
432 return 0;
433 }
434
435 /* --------------------------------------------------------------------- */
436 /*
437 * Open/initialize the board. This is called (in the current kernel)
438 * sometime after booting when the 'ifconfig' program is run.
439 *
440 * This routine should set everything up anew at each open, even
441 * registers that "should" only need to be set once at boot, so that
442 * there is non-reboot way to recover if something goes wrong.
443 */
444
445 static int hdlcdrv_open(struct net_device *dev)
446 {
447 struct hdlcdrv_state *s = netdev_priv(dev);
448 int i;
449
450 if (!s->ops || !s->ops->open)
451 return -ENODEV;
452
453 /*
454 * initialise some variables
455 */
456 s->opened = 1;
457 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
458 s->hdlcrx.in_hdlc_rx = 0;
459 s->hdlcrx.rx_state = 0;
460
461 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
462 s->hdlctx.in_hdlc_tx = 0;
463 s->hdlctx.tx_state = 1;
464 s->hdlctx.numflags = 0;
465 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
466 s->hdlctx.ptt = 0;
467 s->hdlctx.slotcnt = s->ch_params.slottime;
468 s->hdlctx.calibrate = 0;
469
470 i = s->ops->open(dev);
471 if (i)
472 return i;
473 netif_start_queue(dev);
474 return 0;
475 }
476
477 /* --------------------------------------------------------------------- */
478 /*
479 * The inverse routine to hdlcdrv_open().
480 */
481
482 static int hdlcdrv_close(struct net_device *dev)
483 {
484 struct hdlcdrv_state *s = netdev_priv(dev);
485 int i = 0;
486
487 netif_stop_queue(dev);
488
489 if (s->ops && s->ops->close)
490 i = s->ops->close(dev);
491 if (s->skb)
492 dev_kfree_skb(s->skb);
493 s->skb = NULL;
494 s->opened = 0;
495 return i;
496 }
497
498 /* --------------------------------------------------------------------- */
499
500 static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
501 {
502 struct hdlcdrv_state *s = netdev_priv(dev);
503 struct hdlcdrv_ioctl bi;
504
505 if (cmd != SIOCDEVPRIVATE) {
506 if (s->ops && s->ops->ioctl)
507 return s->ops->ioctl(dev, ifr, &bi, cmd);
508 return -ENOIOCTLCMD;
509 }
510 if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
511 return -EFAULT;
512
513 switch (bi.cmd) {
514 default:
515 if (s->ops && s->ops->ioctl)
516 return s->ops->ioctl(dev, ifr, &bi, cmd);
517 return -ENOIOCTLCMD;
518
519 case HDLCDRVCTL_GETCHANNELPAR:
520 bi.data.cp.tx_delay = s->ch_params.tx_delay;
521 bi.data.cp.tx_tail = s->ch_params.tx_tail;
522 bi.data.cp.slottime = s->ch_params.slottime;
523 bi.data.cp.ppersist = s->ch_params.ppersist;
524 bi.data.cp.fulldup = s->ch_params.fulldup;
525 break;
526
527 case HDLCDRVCTL_SETCHANNELPAR:
528 if (!capable(CAP_NET_ADMIN))
529 return -EACCES;
530 s->ch_params.tx_delay = bi.data.cp.tx_delay;
531 s->ch_params.tx_tail = bi.data.cp.tx_tail;
532 s->ch_params.slottime = bi.data.cp.slottime;
533 s->ch_params.ppersist = bi.data.cp.ppersist;
534 s->ch_params.fulldup = bi.data.cp.fulldup;
535 s->hdlctx.slotcnt = 1;
536 return 0;
537
538 case HDLCDRVCTL_GETMODEMPAR:
539 bi.data.mp.iobase = dev->base_addr;
540 bi.data.mp.irq = dev->irq;
541 bi.data.mp.dma = dev->dma;
542 bi.data.mp.dma2 = s->ptt_out.dma2;
543 bi.data.mp.seriobase = s->ptt_out.seriobase;
544 bi.data.mp.pariobase = s->ptt_out.pariobase;
545 bi.data.mp.midiiobase = s->ptt_out.midiiobase;
546 break;
547
548 case HDLCDRVCTL_SETMODEMPAR:
549 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
550 return -EACCES;
551 dev->base_addr = bi.data.mp.iobase;
552 dev->irq = bi.data.mp.irq;
553 dev->dma = bi.data.mp.dma;
554 s->ptt_out.dma2 = bi.data.mp.dma2;
555 s->ptt_out.seriobase = bi.data.mp.seriobase;
556 s->ptt_out.pariobase = bi.data.mp.pariobase;
557 s->ptt_out.midiiobase = bi.data.mp.midiiobase;
558 return 0;
559
560 case HDLCDRVCTL_GETSTAT:
561 bi.data.cs.ptt = hdlcdrv_ptt(s);
562 bi.data.cs.dcd = s->hdlcrx.dcd;
563 bi.data.cs.ptt_keyed = s->ptt_keyed;
564 bi.data.cs.tx_packets = dev->stats.tx_packets;
565 bi.data.cs.tx_errors = dev->stats.tx_errors;
566 bi.data.cs.rx_packets = dev->stats.rx_packets;
567 bi.data.cs.rx_errors = dev->stats.rx_errors;
568 break;
569
570 case HDLCDRVCTL_OLDGETSTAT:
571 bi.data.ocs.ptt = hdlcdrv_ptt(s);
572 bi.data.ocs.dcd = s->hdlcrx.dcd;
573 bi.data.ocs.ptt_keyed = s->ptt_keyed;
574 break;
575
576 case HDLCDRVCTL_CALIBRATE:
577 if(!capable(CAP_SYS_RAWIO))
578 return -EPERM;
579 if (s->par.bitrate <= 0)
580 return -EINVAL;
581 if (bi.data.calibrate > INT_MAX / s->par.bitrate)
582 return -EINVAL;
583 s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16;
584 return 0;
585
586 case HDLCDRVCTL_GETSAMPLES:
587 #ifndef HDLCDRV_DEBUG
588 return -EPERM;
589 #else /* HDLCDRV_DEBUG */
590 if (s->bitbuf_channel.rd == s->bitbuf_channel.wr)
591 return -EAGAIN;
592 bi.data.bits =
593 s->bitbuf_channel.buffer[s->bitbuf_channel.rd];
594 s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) %
595 sizeof(s->bitbuf_channel.buffer);
596 break;
597 #endif /* HDLCDRV_DEBUG */
598
599 case HDLCDRVCTL_GETBITS:
600 #ifndef HDLCDRV_DEBUG
601 return -EPERM;
602 #else /* HDLCDRV_DEBUG */
603 if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr)
604 return -EAGAIN;
605 bi.data.bits =
606 s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd];
607 s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) %
608 sizeof(s->bitbuf_hdlc.buffer);
609 break;
610 #endif /* HDLCDRV_DEBUG */
611
612 case HDLCDRVCTL_DRIVERNAME:
613 if (s->ops && s->ops->drvname) {
614 strncpy(bi.data.drivername, s->ops->drvname,
615 sizeof(bi.data.drivername));
616 break;
617 }
618 bi.data.drivername[0] = '\0';
619 break;
620
621 }
622 if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
623 return -EFAULT;
624 return 0;
625
626 }
627
628 /* --------------------------------------------------------------------- */
629
630 static const struct net_device_ops hdlcdrv_netdev = {
631 .ndo_open = hdlcdrv_open,
632 .ndo_stop = hdlcdrv_close,
633 .ndo_start_xmit = hdlcdrv_send_packet,
634 .ndo_do_ioctl = hdlcdrv_ioctl,
635 .ndo_set_mac_address = hdlcdrv_set_mac_address,
636 };
637
638 /*
639 * Initialize fields in hdlcdrv
640 */
641 static void hdlcdrv_setup(struct net_device *dev)
642 {
643 static const struct hdlcdrv_channel_params dflt_ch_params = {
644 20, 2, 10, 40, 0
645 };
646 struct hdlcdrv_state *s = netdev_priv(dev);
647
648 /*
649 * initialize the hdlcdrv_state struct
650 */
651 s->ch_params = dflt_ch_params;
652 s->ptt_keyed = 0;
653
654 spin_lock_init(&s->hdlcrx.hbuf.lock);
655 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
656 s->hdlcrx.in_hdlc_rx = 0;
657 s->hdlcrx.rx_state = 0;
658
659 spin_lock_init(&s->hdlctx.hbuf.lock);
660 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
661 s->hdlctx.in_hdlc_tx = 0;
662 s->hdlctx.tx_state = 1;
663 s->hdlctx.numflags = 0;
664 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
665 s->hdlctx.ptt = 0;
666 s->hdlctx.slotcnt = s->ch_params.slottime;
667 s->hdlctx.calibrate = 0;
668
669 #ifdef HDLCDRV_DEBUG
670 s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0;
671 s->bitbuf_channel.shreg = 0x80;
672
673 s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0;
674 s->bitbuf_hdlc.shreg = 0x80;
675 #endif /* HDLCDRV_DEBUG */
676
677
678 /* Fill in the fields of the device structure */
679
680 s->skb = NULL;
681
682 dev->netdev_ops = &hdlcdrv_netdev;
683 dev->header_ops = &ax25_header_ops;
684
685 dev->type = ARPHRD_AX25; /* AF_AX25 device */
686 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
687 dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */
688 dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */
689 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
690 memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN);
691 dev->tx_queue_len = 16;
692 }
693
694 /* --------------------------------------------------------------------- */
695 struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops,
696 unsigned int privsize, const char *ifname,
697 unsigned int baseaddr, unsigned int irq,
698 unsigned int dma)
699 {
700 struct net_device *dev;
701 struct hdlcdrv_state *s;
702 int err;
703
704 BUG_ON(ops == NULL);
705
706 if (privsize < sizeof(struct hdlcdrv_state))
707 privsize = sizeof(struct hdlcdrv_state);
708
709 dev = alloc_netdev(privsize, ifname, NET_NAME_UNKNOWN, hdlcdrv_setup);
710 if (!dev)
711 return ERR_PTR(-ENOMEM);
712
713 /*
714 * initialize part of the hdlcdrv_state struct
715 */
716 s = netdev_priv(dev);
717 s->magic = HDLCDRV_MAGIC;
718 s->ops = ops;
719 dev->base_addr = baseaddr;
720 dev->irq = irq;
721 dev->dma = dma;
722
723 err = register_netdev(dev);
724 if (err < 0) {
725 printk(KERN_WARNING "hdlcdrv: cannot register net "
726 "device %s\n", dev->name);
727 free_netdev(dev);
728 dev = ERR_PTR(err);
729 }
730 return dev;
731 }
732
733 /* --------------------------------------------------------------------- */
734
735 void hdlcdrv_unregister(struct net_device *dev)
736 {
737 struct hdlcdrv_state *s = netdev_priv(dev);
738
739 BUG_ON(s->magic != HDLCDRV_MAGIC);
740
741 if (s->opened && s->ops->close)
742 s->ops->close(dev);
743 unregister_netdev(dev);
744
745 free_netdev(dev);
746 }
747
748 /* --------------------------------------------------------------------- */
749
750 EXPORT_SYMBOL(hdlcdrv_receiver);
751 EXPORT_SYMBOL(hdlcdrv_transmitter);
752 EXPORT_SYMBOL(hdlcdrv_arbitrate);
753 EXPORT_SYMBOL(hdlcdrv_register);
754 EXPORT_SYMBOL(hdlcdrv_unregister);
755
756 /* --------------------------------------------------------------------- */
757
758 static int __init hdlcdrv_init_driver(void)
759 {
760 printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n");
761 printk(KERN_INFO "hdlcdrv: version 0.8\n");
762 return 0;
763 }
764
765 /* --------------------------------------------------------------------- */
766
767 static void __exit hdlcdrv_cleanup_driver(void)
768 {
769 printk(KERN_INFO "hdlcdrv: cleanup\n");
770 }
771
772 /* --------------------------------------------------------------------- */
773
774 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
775 MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder");
776 MODULE_LICENSE("GPL");
777 module_init(hdlcdrv_init_driver);
778 module_exit(hdlcdrv_cleanup_driver);
779
780 /* --------------------------------------------------------------------- */
CRIS linux kernel tree