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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*****************************************************************************/
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <linux/module.h>
46#include <linux/types.h>
47#include <linux/net.h>
48#include <linux/in.h>
49#include <linux/if.h>
50#include <linux/slab.h>
51#include <linux/errno.h>
52#include <linux/init.h>
53#include <linux/bitops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55#include <linux/netdevice.h>
56#include <linux/if_arp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070057#include <linux/skbuff.h>
58#include <linux/hdlcdrv.h>
Ralf Baechle8b5b4672007-02-16 11:55:33 +000059#include <linux/random.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070060#include <net/ax25.h>
Ralf Baechlec4bc7ee2005-09-12 14:19:26 -070061#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Linus Torvalds1da177e2005-04-16 15:20:36 -070063#include <linux/crc-ccitt.h>
64
65/* --------------------------------------------------------------------- */
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#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
88static inline void append_crc_ccitt(unsigned char *buffer, int len)
89{
90 unsigned int crc = crc_ccitt(0xffff, buffer, len) ^ 0xffff;
91 *buffer++ = crc;
92 *buffer++ = crc >> 8;
93}
94
95/*---------------------------------------------------------------------------*/
96
97static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
98{
99 return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
100}
101
102/*---------------------------------------------------------------------------*/
103
104#if 0
105static int calc_crc_ccitt(const unsigned char *buf, int cnt)
106{
107 unsigned int crc = 0xffff;
108
109 for (; cnt > 0; cnt--)
110 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff];
111 crc ^= 0xffff;
112 return (crc & 0xffff);
113}
114#endif
115
116/* ---------------------------------------------------------------------- */
117
118#define tenms_to_2flags(s,tenms) ((tenms * s->par.bitrate) / 100 / 16)
119
120/* ---------------------------------------------------------------------- */
121/*
122 * The HDLC routines
123 */
124
125static int hdlc_rx_add_bytes(struct hdlcdrv_state *s, unsigned int bits,
126 int num)
127{
128 int added = 0;
129
130 while (s->hdlcrx.rx_state && num >= 8) {
131 if (s->hdlcrx.len >= sizeof(s->hdlcrx.buffer)) {
132 s->hdlcrx.rx_state = 0;
133 return 0;
134 }
135 *s->hdlcrx.bp++ = bits >> (32-num);
136 s->hdlcrx.len++;
137 num -= 8;
138 added += 8;
139 }
140 return added;
141}
142
143static void hdlc_rx_flag(struct net_device *dev, struct hdlcdrv_state *s)
144{
145 struct sk_buff *skb;
146 int pkt_len;
147 unsigned char *cp;
148
149 if (s->hdlcrx.len < 4)
150 return;
151 if (!check_crc_ccitt(s->hdlcrx.buffer, s->hdlcrx.len))
152 return;
153 pkt_len = s->hdlcrx.len - 2 + 1; /* KISS kludge */
154 if (!(skb = dev_alloc_skb(pkt_len))) {
155 printk("%s: memory squeeze, dropping packet\n", dev->name);
156 s->stats.rx_dropped++;
157 return;
158 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 cp = skb_put(skb, pkt_len);
160 *cp++ = 0; /* KISS kludge */
161 memcpy(cp, s->hdlcrx.buffer, pkt_len - 1);
Arnaldo Carvalho de Melo56cb5152005-04-24 18:53:06 -0700162 skb->protocol = ax25_type_trans(skb, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 netif_rx(skb);
164 dev->last_rx = jiffies;
165 s->stats.rx_packets++;
166}
167
168void 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
224static 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
265void 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 memcpy(s->hdlctx.buffer, skb->data+1, pkt_len);
321 dev_kfree_skb_irq(skb);
322 s->hdlctx.bp = s->hdlctx.buffer;
323 append_crc_ccitt(s->hdlctx.buffer, pkt_len);
324 s->hdlctx.len = pkt_len+2; /* the appended CRC */
325 s->hdlctx.tx_state = 2;
326 s->hdlctx.bitstream = 0;
327 s->stats.tx_packets++;
328 break;
329 case 2:
330 if (!s->hdlctx.len) {
331 s->hdlctx.tx_state = 0;
332 s->hdlctx.numflags = 1;
333 break;
334 }
335 s->hdlctx.len--;
336 s->hdlctx.bitbuf |= *s->hdlctx.bp <<
337 s->hdlctx.numbits;
338 s->hdlctx.bitstream >>= 8;
339 s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16;
340 mask1 = 0x1f000;
341 mask2 = 0x10000;
342 mask3 = 0xffffffff >> (31-s->hdlctx.numbits);
343 s->hdlctx.numbits += 8;
344 for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1,
345 mask3 = (mask3 << 1) | 1) {
346 if ((s->hdlctx.bitstream & mask1) != mask1)
347 continue;
348 s->hdlctx.bitstream &= ~mask2;
349 s->hdlctx.bitbuf =
350 (s->hdlctx.bitbuf & mask3) |
351 ((s->hdlctx.bitbuf &
352 (~mask3)) << 1);
353 s->hdlctx.numbits++;
354 mask3 = (mask3 << 1) | 1;
355 }
356 break;
357 }
358 }
359}
360
361/* ---------------------------------------------------------------------- */
362
363static void start_tx(struct net_device *dev, struct hdlcdrv_state *s)
364{
365 s->hdlctx.tx_state = 0;
366 s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay);
367 s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0;
368 hdlcdrv_transmitter(dev, s);
369 s->hdlctx.ptt = 1;
370 s->ptt_keyed++;
371}
372
373/* ---------------------------------------------------------------------- */
374
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s)
376{
377 if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb)
378 return;
379 if (s->ch_params.fulldup) {
380 start_tx(dev, s);
381 return;
382 }
383 if (s->hdlcrx.dcd) {
384 s->hdlctx.slotcnt = s->ch_params.slottime;
385 return;
386 }
387 if ((--s->hdlctx.slotcnt) > 0)
388 return;
389 s->hdlctx.slotcnt = s->ch_params.slottime;
Ralf Baechle8b5b4672007-02-16 11:55:33 +0000390 if ((random32() % 256) > s->ch_params.ppersist)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 return;
392 start_tx(dev, s);
393}
394
395/* --------------------------------------------------------------------- */
396/*
397 * ===================== network driver interface =========================
398 */
399
400static int hdlcdrv_send_packet(struct sk_buff *skb, struct net_device *dev)
401{
402 struct hdlcdrv_state *sm = netdev_priv(dev);
403
404 if (skb->data[0] != 0) {
405 do_kiss_params(sm, skb->data, skb->len);
406 dev_kfree_skb(skb);
407 return 0;
408 }
409 if (sm->skb)
410 return -1;
411 netif_stop_queue(dev);
412 sm->skb = skb;
413 return 0;
414}
415
416/* --------------------------------------------------------------------- */
417
418static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr)
419{
420 struct sockaddr *sa = (struct sockaddr *)addr;
421
422 /* addr is an AX.25 shifted ASCII mac address */
423 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
424 return 0;
425}
426
427/* --------------------------------------------------------------------- */
428
429static struct net_device_stats *hdlcdrv_get_stats(struct net_device *dev)
430{
431 struct hdlcdrv_state *sm = netdev_priv(dev);
432
433 /*
434 * Get the current statistics. This may be called with the
435 * card open or closed.
436 */
437 return &sm->stats;
438}
439
440/* --------------------------------------------------------------------- */
441/*
442 * Open/initialize the board. This is called (in the current kernel)
443 * sometime after booting when the 'ifconfig' program is run.
444 *
445 * This routine should set everything up anew at each open, even
446 * registers that "should" only need to be set once at boot, so that
447 * there is non-reboot way to recover if something goes wrong.
448 */
449
450static int hdlcdrv_open(struct net_device *dev)
451{
452 struct hdlcdrv_state *s = netdev_priv(dev);
453 int i;
454
455 if (!s->ops || !s->ops->open)
456 return -ENODEV;
457
458 /*
459 * initialise some variables
460 */
461 s->opened = 1;
462 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
463 s->hdlcrx.in_hdlc_rx = 0;
464 s->hdlcrx.rx_state = 0;
465
466 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
467 s->hdlctx.in_hdlc_tx = 0;
468 s->hdlctx.tx_state = 1;
469 s->hdlctx.numflags = 0;
470 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
471 s->hdlctx.ptt = 0;
472 s->hdlctx.slotcnt = s->ch_params.slottime;
473 s->hdlctx.calibrate = 0;
474
475 i = s->ops->open(dev);
476 if (i)
477 return i;
478 netif_start_queue(dev);
479 return 0;
480}
481
482/* --------------------------------------------------------------------- */
483/*
484 * The inverse routine to hdlcdrv_open().
485 */
486
487static int hdlcdrv_close(struct net_device *dev)
488{
489 struct hdlcdrv_state *s = netdev_priv(dev);
490 int i = 0;
491
492 netif_stop_queue(dev);
493
494 if (s->ops && s->ops->close)
495 i = s->ops->close(dev);
496 if (s->skb)
497 dev_kfree_skb(s->skb);
498 s->skb = NULL;
499 s->opened = 0;
500 return i;
501}
502
503/* --------------------------------------------------------------------- */
504
505static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
506{
507 struct hdlcdrv_state *s = netdev_priv(dev);
508 struct hdlcdrv_ioctl bi;
509
510 if (cmd != SIOCDEVPRIVATE) {
511 if (s->ops && s->ops->ioctl)
512 return s->ops->ioctl(dev, ifr, &bi, cmd);
513 return -ENOIOCTLCMD;
514 }
515 if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
516 return -EFAULT;
517
518 switch (bi.cmd) {
519 default:
520 if (s->ops && s->ops->ioctl)
521 return s->ops->ioctl(dev, ifr, &bi, cmd);
522 return -ENOIOCTLCMD;
523
524 case HDLCDRVCTL_GETCHANNELPAR:
525 bi.data.cp.tx_delay = s->ch_params.tx_delay;
526 bi.data.cp.tx_tail = s->ch_params.tx_tail;
527 bi.data.cp.slottime = s->ch_params.slottime;
528 bi.data.cp.ppersist = s->ch_params.ppersist;
529 bi.data.cp.fulldup = s->ch_params.fulldup;
530 break;
531
532 case HDLCDRVCTL_SETCHANNELPAR:
533 if (!capable(CAP_NET_ADMIN))
534 return -EACCES;
535 s->ch_params.tx_delay = bi.data.cp.tx_delay;
536 s->ch_params.tx_tail = bi.data.cp.tx_tail;
537 s->ch_params.slottime = bi.data.cp.slottime;
538 s->ch_params.ppersist = bi.data.cp.ppersist;
539 s->ch_params.fulldup = bi.data.cp.fulldup;
540 s->hdlctx.slotcnt = 1;
541 return 0;
542
543 case HDLCDRVCTL_GETMODEMPAR:
544 bi.data.mp.iobase = dev->base_addr;
545 bi.data.mp.irq = dev->irq;
546 bi.data.mp.dma = dev->dma;
547 bi.data.mp.dma2 = s->ptt_out.dma2;
548 bi.data.mp.seriobase = s->ptt_out.seriobase;
549 bi.data.mp.pariobase = s->ptt_out.pariobase;
550 bi.data.mp.midiiobase = s->ptt_out.midiiobase;
551 break;
552
553 case HDLCDRVCTL_SETMODEMPAR:
554 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
555 return -EACCES;
556 dev->base_addr = bi.data.mp.iobase;
557 dev->irq = bi.data.mp.irq;
558 dev->dma = bi.data.mp.dma;
559 s->ptt_out.dma2 = bi.data.mp.dma2;
560 s->ptt_out.seriobase = bi.data.mp.seriobase;
561 s->ptt_out.pariobase = bi.data.mp.pariobase;
562 s->ptt_out.midiiobase = bi.data.mp.midiiobase;
563 return 0;
564
565 case HDLCDRVCTL_GETSTAT:
566 bi.data.cs.ptt = hdlcdrv_ptt(s);
567 bi.data.cs.dcd = s->hdlcrx.dcd;
568 bi.data.cs.ptt_keyed = s->ptt_keyed;
569 bi.data.cs.tx_packets = s->stats.tx_packets;
570 bi.data.cs.tx_errors = s->stats.tx_errors;
571 bi.data.cs.rx_packets = s->stats.rx_packets;
572 bi.data.cs.rx_errors = s->stats.rx_errors;
573 break;
574
575 case HDLCDRVCTL_OLDGETSTAT:
576 bi.data.ocs.ptt = hdlcdrv_ptt(s);
577 bi.data.ocs.dcd = s->hdlcrx.dcd;
578 bi.data.ocs.ptt_keyed = s->ptt_keyed;
579 break;
580
581 case HDLCDRVCTL_CALIBRATE:
582 if(!capable(CAP_SYS_RAWIO))
583 return -EPERM;
584 s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16;
585 return 0;
586
587 case HDLCDRVCTL_GETSAMPLES:
588#ifndef HDLCDRV_DEBUG
589 return -EPERM;
590#else /* HDLCDRV_DEBUG */
591 if (s->bitbuf_channel.rd == s->bitbuf_channel.wr)
592 return -EAGAIN;
593 bi.data.bits =
594 s->bitbuf_channel.buffer[s->bitbuf_channel.rd];
595 s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) %
596 sizeof(s->bitbuf_channel.buffer);
597 break;
598#endif /* HDLCDRV_DEBUG */
599
600 case HDLCDRVCTL_GETBITS:
601#ifndef HDLCDRV_DEBUG
602 return -EPERM;
603#else /* HDLCDRV_DEBUG */
604 if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr)
605 return -EAGAIN;
606 bi.data.bits =
607 s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd];
608 s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) %
609 sizeof(s->bitbuf_hdlc.buffer);
610 break;
611#endif /* HDLCDRV_DEBUG */
612
613 case HDLCDRVCTL_DRIVERNAME:
614 if (s->ops && s->ops->drvname) {
615 strncpy(bi.data.drivername, s->ops->drvname,
616 sizeof(bi.data.drivername));
617 break;
618 }
619 bi.data.drivername[0] = '\0';
620 break;
621
622 }
623 if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
624 return -EFAULT;
625 return 0;
626
627}
628
629/* --------------------------------------------------------------------- */
630
631/*
632 * Initialize fields in hdlcdrv
633 */
634static void hdlcdrv_setup(struct net_device *dev)
635{
636 static const struct hdlcdrv_channel_params dflt_ch_params = {
637 20, 2, 10, 40, 0
638 };
639 struct hdlcdrv_state *s = netdev_priv(dev);
640
641 /*
642 * initialize the hdlcdrv_state struct
643 */
644 s->ch_params = dflt_ch_params;
645 s->ptt_keyed = 0;
646
647 spin_lock_init(&s->hdlcrx.hbuf.lock);
648 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
649 s->hdlcrx.in_hdlc_rx = 0;
650 s->hdlcrx.rx_state = 0;
651
652 spin_lock_init(&s->hdlctx.hbuf.lock);
653 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
654 s->hdlctx.in_hdlc_tx = 0;
655 s->hdlctx.tx_state = 1;
656 s->hdlctx.numflags = 0;
657 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
658 s->hdlctx.ptt = 0;
659 s->hdlctx.slotcnt = s->ch_params.slottime;
660 s->hdlctx.calibrate = 0;
661
662#ifdef HDLCDRV_DEBUG
663 s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0;
664 s->bitbuf_channel.shreg = 0x80;
665
666 s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0;
667 s->bitbuf_hdlc.shreg = 0x80;
668#endif /* HDLCDRV_DEBUG */
669
670 /*
671 * initialize the device struct
672 */
673 dev->open = hdlcdrv_open;
674 dev->stop = hdlcdrv_close;
675 dev->do_ioctl = hdlcdrv_ioctl;
676 dev->hard_start_xmit = hdlcdrv_send_packet;
677 dev->get_stats = hdlcdrv_get_stats;
678
679 /* Fill in the fields of the device structure */
680
681 s->skb = NULL;
682
Ralf Baechle6f749982005-09-12 14:21:01 -0700683 dev->hard_header = ax25_hard_header;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 dev->rebuild_header = ax25_rebuild_header;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 dev->set_mac_address = hdlcdrv_set_mac_address;
686
687 dev->type = ARPHRD_AX25; /* AF_AX25 device */
688 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
689 dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */
690 dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */
Ralf Baechle15b1c0e2006-12-07 15:47:08 -0800691 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
692 memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 dev->tx_queue_len = 16;
694}
695
696/* --------------------------------------------------------------------- */
697struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops,
698 unsigned int privsize, const char *ifname,
699 unsigned int baseaddr, unsigned int irq,
700 unsigned int dma)
701{
702 struct net_device *dev;
703 struct hdlcdrv_state *s;
704 int err;
705
706 BUG_ON(ops == NULL);
707
708 if (privsize < sizeof(struct hdlcdrv_state))
709 privsize = sizeof(struct hdlcdrv_state);
710
711 dev = alloc_netdev(privsize, ifname, hdlcdrv_setup);
712 if (!dev)
713 return ERR_PTR(-ENOMEM);
714
715 /*
716 * initialize part of the hdlcdrv_state struct
717 */
718 s = netdev_priv(dev);
719 s->magic = HDLCDRV_MAGIC;
720 s->ops = ops;
721 dev->base_addr = baseaddr;
722 dev->irq = irq;
723 dev->dma = dma;
724
725 err = register_netdev(dev);
726 if (err < 0) {
727 printk(KERN_WARNING "hdlcdrv: cannot register net "
728 "device %s\n", dev->name);
729 free_netdev(dev);
730 dev = ERR_PTR(err);
731 }
732 return dev;
733}
734
735/* --------------------------------------------------------------------- */
736
737void hdlcdrv_unregister(struct net_device *dev)
738{
739 struct hdlcdrv_state *s = netdev_priv(dev);
740
741 BUG_ON(s->magic != HDLCDRV_MAGIC);
742
743 if (s->opened && s->ops->close)
744 s->ops->close(dev);
745 unregister_netdev(dev);
746
747 free_netdev(dev);
748}
749
750/* --------------------------------------------------------------------- */
751
752EXPORT_SYMBOL(hdlcdrv_receiver);
753EXPORT_SYMBOL(hdlcdrv_transmitter);
754EXPORT_SYMBOL(hdlcdrv_arbitrate);
755EXPORT_SYMBOL(hdlcdrv_register);
756EXPORT_SYMBOL(hdlcdrv_unregister);
757
758/* --------------------------------------------------------------------- */
759
760static int __init hdlcdrv_init_driver(void)
761{
762 printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n");
763 printk(KERN_INFO "hdlcdrv: version 0.8 compiled " __TIME__ " " __DATE__ "\n");
764 return 0;
765}
766
767/* --------------------------------------------------------------------- */
768
769static void __exit hdlcdrv_cleanup_driver(void)
770{
771 printk(KERN_INFO "hdlcdrv: cleanup\n");
772}
773
774/* --------------------------------------------------------------------- */
775
776MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
777MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder");
778MODULE_LICENSE("GPL");
779module_init(hdlcdrv_init_driver);
780module_exit(hdlcdrv_cleanup_driver);
781
782/* --------------------------------------------------------------------- */