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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / drivers / net / hamradio / hdlcdrv.c
blobb4c836e4fe860d4a4e7fe0d82a52736dd7432f2c
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/config.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/slab.h>
52 #include <linux/errno.h>
53 #include <linux/init.h>
54 #include <linux/bitops.h>
55 #include <asm/uaccess.h>
56
57 #include <linux/netdevice.h>
58 #include <linux/if_arp.h>
59 #include <linux/etherdevice.h>
60 #include <linux/skbuff.h>
61 #include <linux/hdlcdrv.h>
62 /* prototypes for ax25_encapsulate and ax25_rebuild_header */
63 #include <net/ax25.h>
64
65 /* make genksyms happy */
66 #include <linux/ip.h>
67 #include <linux/udp.h>
68 #include <linux/tcp.h>
69 #include <linux/crc-ccitt.h>
70
71 /* --------------------------------------------------------------------- */
72
73 /*
74 * The name of the card. Is used for messages and in the requests for
75 * io regions, irqs and dma channels
76 */
77
78 static char ax25_bcast[AX25_ADDR_LEN] =
79 {'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1};
80 static char ax25_nocall[AX25_ADDR_LEN] =
81 {'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1};
82
83 /* --------------------------------------------------------------------- */
84
85 #define KISS_VERBOSE
86
87 /* --------------------------------------------------------------------- */
88
89 #define PARAM_TXDELAY 1
90 #define PARAM_PERSIST 2
91 #define PARAM_SLOTTIME 3
92 #define PARAM_TXTAIL 4
93 #define PARAM_FULLDUP 5
94 #define PARAM_HARDWARE 6
95 #define PARAM_RETURN 255
96
97 /* --------------------------------------------------------------------- */
98 /*
99 * the CRC routines are stolen from WAMPES
100 * by Dieter Deyke
101 */
102
103
104 /*---------------------------------------------------------------------------*/
105
106 static inline void append_crc_ccitt(unsigned char *buffer, int len)
107 {
108 unsigned int crc = crc_ccitt(0xffff, buffer, len) ^ 0xffff;
109 *buffer++ = crc;
110 *buffer++ = crc >> 8;
111 }
112
113 /*---------------------------------------------------------------------------*/
114
115 static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
116 {
117 return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
118 }
119
120 /*---------------------------------------------------------------------------*/
121
122 #if 0
123 static int calc_crc_ccitt(const unsigned char *buf, int cnt)
124 {
125 unsigned int crc = 0xffff;
126
127 for (; cnt > 0; cnt--)
128 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff];
129 crc ^= 0xffff;
130 return (crc & 0xffff);
131 }
132 #endif
133
134 /* ---------------------------------------------------------------------- */
135
136 #define tenms_to_2flags(s,tenms) ((tenms * s->par.bitrate) / 100 / 16)
137
138 /* ---------------------------------------------------------------------- */
139 /*
140 * The HDLC routines
141 */
142
143 static int hdlc_rx_add_bytes(struct hdlcdrv_state *s, unsigned int bits,
144 int num)
145 {
146 int added = 0;
147
148 while (s->hdlcrx.rx_state && num >= 8) {
149 if (s->hdlcrx.len >= sizeof(s->hdlcrx.buffer)) {
150 s->hdlcrx.rx_state = 0;
151 return 0;
152 }
153 *s->hdlcrx.bp++ = bits >> (32-num);
154 s->hdlcrx.len++;
155 num -= 8;
156 added += 8;
157 }
158 return added;
159 }
160
161 static void hdlc_rx_flag(struct net_device *dev, struct hdlcdrv_state *s)
162 {
163 struct sk_buff *skb;
164 int pkt_len;
165 unsigned char *cp;
166
167 if (s->hdlcrx.len < 4)
168 return;
169 if (!check_crc_ccitt(s->hdlcrx.buffer, s->hdlcrx.len))
170 return;
171 pkt_len = s->hdlcrx.len - 2 + 1; /* KISS kludge */
172 if (!(skb = dev_alloc_skb(pkt_len))) {
173 printk("%s: memory squeeze, dropping packet\n", dev->name);
174 s->stats.rx_dropped++;
175 return;
176 }
177 cp = skb_put(skb, pkt_len);
178 *cp++ = 0; /* KISS kludge */
179 memcpy(cp, s->hdlcrx.buffer, pkt_len - 1);
180 skb->protocol = ax25_type_trans(skb, dev);
181 netif_rx(skb);
182 dev->last_rx = jiffies;
183 s->stats.rx_packets++;
184 }
185
186 void hdlcdrv_receiver(struct net_device *dev, struct hdlcdrv_state *s)
187 {
188 int i;
189 unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word;
190
191 if (!s || s->magic != HDLCDRV_MAGIC)
192 return;
193 if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx))
194 return;
195
196 while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) {
197 word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf);
198
199 #ifdef HDLCDRV_DEBUG
200 hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word);
201 #endif /* HDLCDRV_DEBUG */
202 s->hdlcrx.bitstream >>= 16;
203 s->hdlcrx.bitstream |= word << 16;
204 s->hdlcrx.bitbuf >>= 16;
205 s->hdlcrx.bitbuf |= word << 16;
206 s->hdlcrx.numbits += 16;
207 for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00,
208 mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff;
209 i >= 0;
210 i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1,
211 mask5 <<= 1, mask6 = (mask6 << 1) | 1) {
212 if ((s->hdlcrx.bitstream & mask1) == mask1)
213 s->hdlcrx.rx_state = 0; /* abort received */
214 else if ((s->hdlcrx.bitstream & mask2) == mask3) {
215 /* flag received */
216 if (s->hdlcrx.rx_state) {
217 hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf
218 << (8+i),
219 s->hdlcrx.numbits
220 -8-i);
221 hdlc_rx_flag(dev, s);
222 }
223 s->hdlcrx.len = 0;
224 s->hdlcrx.bp = s->hdlcrx.buffer;
225 s->hdlcrx.rx_state = 1;
226 s->hdlcrx.numbits = i;
227 } else if ((s->hdlcrx.bitstream & mask4) == mask5) {
228 /* stuffed bit */
229 s->hdlcrx.numbits--;
230 s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) |
231 ((s->hdlcrx.bitbuf & mask6) << 1);
232 }
233 }
234 s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf,
235 s->hdlcrx.numbits);
236 }
237 clear_bit(0, &s->hdlcrx.in_hdlc_rx);
238 }
239
240 /* ---------------------------------------------------------------------- */
241
242 static inline void do_kiss_params(struct hdlcdrv_state *s,
243 unsigned char *data, unsigned long len)
244 {
245
246 #ifdef KISS_VERBOSE
247 #define PKP(a,b) printk(KERN_INFO "hdlcdrv.c: channel params: " a "\n", b)
248 #else /* KISS_VERBOSE */
249 #define PKP(a,b)
250 #endif /* KISS_VERBOSE */
251
252 if (len < 2)
253 return;
254 switch(data[0]) {
255 case PARAM_TXDELAY:
256 s->ch_params.tx_delay = data[1];
257 PKP("TX delay = %ums", 10 * s->ch_params.tx_delay);
258 break;
259 case PARAM_PERSIST:
260 s->ch_params.ppersist = data[1];
261 PKP("p persistence = %u", s->ch_params.ppersist);
262 break;
263 case PARAM_SLOTTIME:
264 s->ch_params.slottime = data[1];
265 PKP("slot time = %ums", s->ch_params.slottime);
266 break;
267 case PARAM_TXTAIL:
268 s->ch_params.tx_tail = data[1];
269 PKP("TX tail = %ums", s->ch_params.tx_tail);
270 break;
271 case PARAM_FULLDUP:
272 s->ch_params.fulldup = !!data[1];
273 PKP("%s duplex", s->ch_params.fulldup ? "full" : "half");
274 break;
275 default:
276 break;
277 }
278 #undef PKP
279 }
280
281 /* ---------------------------------------------------------------------- */
282
283 void hdlcdrv_transmitter(struct net_device *dev, struct hdlcdrv_state *s)
284 {
285 unsigned int mask1, mask2, mask3;
286 int i;
287 struct sk_buff *skb;
288 int pkt_len;
289
290 if (!s || s->magic != HDLCDRV_MAGIC)
291 return;
292 if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx))
293 return;
294 for (;;) {
295 if (s->hdlctx.numbits >= 16) {
296 if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) {
297 clear_bit(0, &s->hdlctx.in_hdlc_tx);
298 return;
299 }
300 hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf);
301 s->hdlctx.bitbuf >>= 16;
302 s->hdlctx.numbits -= 16;
303 }
304 switch (s->hdlctx.tx_state) {
305 default:
306 clear_bit(0, &s->hdlctx.in_hdlc_tx);
307 return;
308 case 0:
309 case 1:
310 if (s->hdlctx.numflags) {
311 s->hdlctx.numflags--;
312 s->hdlctx.bitbuf |=
313 0x7e7e << s->hdlctx.numbits;
314 s->hdlctx.numbits += 16;
315 break;
316 }
317 if (s->hdlctx.tx_state == 1) {
318 clear_bit(0, &s->hdlctx.in_hdlc_tx);
319 return;
320 }
321 if (!(skb = s->skb)) {
322 int flgs = tenms_to_2flags(s, s->ch_params.tx_tail);
323 if (flgs < 2)
324 flgs = 2;
325 s->hdlctx.tx_state = 1;
326 s->hdlctx.numflags = flgs;
327 break;
328 }
329 s->skb = NULL;
330 netif_wake_queue(dev);
331 pkt_len = skb->len-1; /* strip KISS byte */
332 if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) {
333 s->hdlctx.tx_state = 0;
334 s->hdlctx.numflags = 1;
335 dev_kfree_skb_irq(skb);
336 break;
337 }
338 memcpy(s->hdlctx.buffer, skb->data+1, pkt_len);
339 dev_kfree_skb_irq(skb);
340 s->hdlctx.bp = s->hdlctx.buffer;
341 append_crc_ccitt(s->hdlctx.buffer, pkt_len);
342 s->hdlctx.len = pkt_len+2; /* the appended CRC */
343 s->hdlctx.tx_state = 2;
344 s->hdlctx.bitstream = 0;
345 s->stats.tx_packets++;
346 break;
347 case 2:
348 if (!s->hdlctx.len) {
349 s->hdlctx.tx_state = 0;
350 s->hdlctx.numflags = 1;
351 break;
352 }
353 s->hdlctx.len--;
354 s->hdlctx.bitbuf |= *s->hdlctx.bp <<
355 s->hdlctx.numbits;
356 s->hdlctx.bitstream >>= 8;
357 s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16;
358 mask1 = 0x1f000;
359 mask2 = 0x10000;
360 mask3 = 0xffffffff >> (31-s->hdlctx.numbits);
361 s->hdlctx.numbits += 8;
362 for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1,
363 mask3 = (mask3 << 1) | 1) {
364 if ((s->hdlctx.bitstream & mask1) != mask1)
365 continue;
366 s->hdlctx.bitstream &= ~mask2;
367 s->hdlctx.bitbuf =
368 (s->hdlctx.bitbuf & mask3) |
369 ((s->hdlctx.bitbuf &
370 (~mask3)) << 1);
371 s->hdlctx.numbits++;
372 mask3 = (mask3 << 1) | 1;
373 }
374 break;
375 }
376 }
377 }
378
379 /* ---------------------------------------------------------------------- */
380
381 static void start_tx(struct net_device *dev, struct hdlcdrv_state *s)
382 {
383 s->hdlctx.tx_state = 0;
384 s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay);
385 s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0;
386 hdlcdrv_transmitter(dev, s);
387 s->hdlctx.ptt = 1;
388 s->ptt_keyed++;
389 }
390
391 /* ---------------------------------------------------------------------- */
392
393 static unsigned short random_seed;
394
395 static inline unsigned short random_num(void)
396 {
397 random_seed = 28629 * random_seed + 157;
398 return random_seed;
399 }
400
401 /* ---------------------------------------------------------------------- */
402
403 void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s)
404 {
405 if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb)
406 return;
407 if (s->ch_params.fulldup) {
408 start_tx(dev, s);
409 return;
410 }
411 if (s->hdlcrx.dcd) {
412 s->hdlctx.slotcnt = s->ch_params.slottime;
413 return;
414 }
415 if ((--s->hdlctx.slotcnt) > 0)
416 return;
417 s->hdlctx.slotcnt = s->ch_params.slottime;
418 if ((random_num() % 256) > s->ch_params.ppersist)
419 return;
420 start_tx(dev, s);
421 }
422
423 /* --------------------------------------------------------------------- */
424 /*
425 * ===================== network driver interface =========================
426 */
427
428 static int hdlcdrv_send_packet(struct sk_buff *skb, struct net_device *dev)
429 {
430 struct hdlcdrv_state *sm = netdev_priv(dev);
431
432 if (skb->data[0] != 0) {
433 do_kiss_params(sm, skb->data, skb->len);
434 dev_kfree_skb(skb);
435 return 0;
436 }
437 if (sm->skb)
438 return -1;
439 netif_stop_queue(dev);
440 sm->skb = skb;
441 return 0;
442 }
443
444 /* --------------------------------------------------------------------- */
445
446 static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr)
447 {
448 struct sockaddr *sa = (struct sockaddr *)addr;
449
450 /* addr is an AX.25 shifted ASCII mac address */
451 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
452 return 0;
453 }
454
455 /* --------------------------------------------------------------------- */
456
457 static struct net_device_stats *hdlcdrv_get_stats(struct net_device *dev)
458 {
459 struct hdlcdrv_state *sm = netdev_priv(dev);
460
461 /*
462 * Get the current statistics. This may be called with the
463 * card open or closed.
464 */
465 return &sm->stats;
466 }
467
468 /* --------------------------------------------------------------------- */
469 /*
470 * Open/initialize the board. This is called (in the current kernel)
471 * sometime after booting when the 'ifconfig' program is run.
472 *
473 * This routine should set everything up anew at each open, even
474 * registers that "should" only need to be set once at boot, so that
475 * there is non-reboot way to recover if something goes wrong.
476 */
477
478 static int hdlcdrv_open(struct net_device *dev)
479 {
480 struct hdlcdrv_state *s = netdev_priv(dev);
481 int i;
482
483 if (!s->ops || !s->ops->open)
484 return -ENODEV;
485
486 /*
487 * initialise some variables
488 */
489 s->opened = 1;
490 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
491 s->hdlcrx.in_hdlc_rx = 0;
492 s->hdlcrx.rx_state = 0;
493
494 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
495 s->hdlctx.in_hdlc_tx = 0;
496 s->hdlctx.tx_state = 1;
497 s->hdlctx.numflags = 0;
498 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
499 s->hdlctx.ptt = 0;
500 s->hdlctx.slotcnt = s->ch_params.slottime;
501 s->hdlctx.calibrate = 0;
502
503 i = s->ops->open(dev);
504 if (i)
505 return i;
506 netif_start_queue(dev);
507 return 0;
508 }
509
510 /* --------------------------------------------------------------------- */
511 /*
512 * The inverse routine to hdlcdrv_open().
513 */
514
515 static int hdlcdrv_close(struct net_device *dev)
516 {
517 struct hdlcdrv_state *s = netdev_priv(dev);
518 int i = 0;
519
520 netif_stop_queue(dev);
521
522 if (s->ops && s->ops->close)
523 i = s->ops->close(dev);
524 if (s->skb)
525 dev_kfree_skb(s->skb);
526 s->skb = NULL;
527 s->opened = 0;
528 return i;
529 }
530
531 /* --------------------------------------------------------------------- */
532
533 static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
534 {
535 struct hdlcdrv_state *s = netdev_priv(dev);
536 struct hdlcdrv_ioctl bi;
537
538 if (cmd != SIOCDEVPRIVATE) {
539 if (s->ops && s->ops->ioctl)
540 return s->ops->ioctl(dev, ifr, &bi, cmd);
541 return -ENOIOCTLCMD;
542 }
543 if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
544 return -EFAULT;
545
546 switch (bi.cmd) {
547 default:
548 if (s->ops && s->ops->ioctl)
549 return s->ops->ioctl(dev, ifr, &bi, cmd);
550 return -ENOIOCTLCMD;
551
552 case HDLCDRVCTL_GETCHANNELPAR:
553 bi.data.cp.tx_delay = s->ch_params.tx_delay;
554 bi.data.cp.tx_tail = s->ch_params.tx_tail;
555 bi.data.cp.slottime = s->ch_params.slottime;
556 bi.data.cp.ppersist = s->ch_params.ppersist;
557 bi.data.cp.fulldup = s->ch_params.fulldup;
558 break;
559
560 case HDLCDRVCTL_SETCHANNELPAR:
561 if (!capable(CAP_NET_ADMIN))
562 return -EACCES;
563 s->ch_params.tx_delay = bi.data.cp.tx_delay;
564 s->ch_params.tx_tail = bi.data.cp.tx_tail;
565 s->ch_params.slottime = bi.data.cp.slottime;
566 s->ch_params.ppersist = bi.data.cp.ppersist;
567 s->ch_params.fulldup = bi.data.cp.fulldup;
568 s->hdlctx.slotcnt = 1;
569 return 0;
570
571 case HDLCDRVCTL_GETMODEMPAR:
572 bi.data.mp.iobase = dev->base_addr;
573 bi.data.mp.irq = dev->irq;
574 bi.data.mp.dma = dev->dma;
575 bi.data.mp.dma2 = s->ptt_out.dma2;
576 bi.data.mp.seriobase = s->ptt_out.seriobase;
577 bi.data.mp.pariobase = s->ptt_out.pariobase;
578 bi.data.mp.midiiobase = s->ptt_out.midiiobase;
579 break;
580
581 case HDLCDRVCTL_SETMODEMPAR:
582 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
583 return -EACCES;
584 dev->base_addr = bi.data.mp.iobase;
585 dev->irq = bi.data.mp.irq;
586 dev->dma = bi.data.mp.dma;
587 s->ptt_out.dma2 = bi.data.mp.dma2;
588 s->ptt_out.seriobase = bi.data.mp.seriobase;
589 s->ptt_out.pariobase = bi.data.mp.pariobase;
590 s->ptt_out.midiiobase = bi.data.mp.midiiobase;
591 return 0;
592
593 case HDLCDRVCTL_GETSTAT:
594 bi.data.cs.ptt = hdlcdrv_ptt(s);
595 bi.data.cs.dcd = s->hdlcrx.dcd;
596 bi.data.cs.ptt_keyed = s->ptt_keyed;
597 bi.data.cs.tx_packets = s->stats.tx_packets;
598 bi.data.cs.tx_errors = s->stats.tx_errors;
599 bi.data.cs.rx_packets = s->stats.rx_packets;
600 bi.data.cs.rx_errors = s->stats.rx_errors;
601 break;
602
603 case HDLCDRVCTL_OLDGETSTAT:
604 bi.data.ocs.ptt = hdlcdrv_ptt(s);
605 bi.data.ocs.dcd = s->hdlcrx.dcd;
606 bi.data.ocs.ptt_keyed = s->ptt_keyed;
607 break;
608
609 case HDLCDRVCTL_CALIBRATE:
610 if(!capable(CAP_SYS_RAWIO))
611 return -EPERM;
612 s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16;
613 return 0;
614
615 case HDLCDRVCTL_GETSAMPLES:
616 #ifndef HDLCDRV_DEBUG
617 return -EPERM;
618 #else /* HDLCDRV_DEBUG */
619 if (s->bitbuf_channel.rd == s->bitbuf_channel.wr)
620 return -EAGAIN;
621 bi.data.bits =
622 s->bitbuf_channel.buffer[s->bitbuf_channel.rd];
623 s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) %
624 sizeof(s->bitbuf_channel.buffer);
625 break;
626 #endif /* HDLCDRV_DEBUG */
627
628 case HDLCDRVCTL_GETBITS:
629 #ifndef HDLCDRV_DEBUG
630 return -EPERM;
631 #else /* HDLCDRV_DEBUG */
632 if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr)
633 return -EAGAIN;
634 bi.data.bits =
635 s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd];
636 s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) %
637 sizeof(s->bitbuf_hdlc.buffer);
638 break;
639 #endif /* HDLCDRV_DEBUG */
640
641 case HDLCDRVCTL_DRIVERNAME:
642 if (s->ops && s->ops->drvname) {
643 strncpy(bi.data.drivername, s->ops->drvname,
644 sizeof(bi.data.drivername));
645 break;
646 }
647 bi.data.drivername[0] = '\0';
648 break;
649
650 }
651 if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
652 return -EFAULT;
653 return 0;
654
655 }
656
657 /* --------------------------------------------------------------------- */
658
659 /*
660 * Initialize fields in hdlcdrv
661 */
662 static void hdlcdrv_setup(struct net_device *dev)
663 {
664 static const struct hdlcdrv_channel_params dflt_ch_params = {
665 20, 2, 10, 40, 0
666 };
667 struct hdlcdrv_state *s = netdev_priv(dev);
668
669 /*
670 * initialize the hdlcdrv_state struct
671 */
672 s->ch_params = dflt_ch_params;
673 s->ptt_keyed = 0;
674
675 spin_lock_init(&s->hdlcrx.hbuf.lock);
676 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
677 s->hdlcrx.in_hdlc_rx = 0;
678 s->hdlcrx.rx_state = 0;
679
680 spin_lock_init(&s->hdlctx.hbuf.lock);
681 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
682 s->hdlctx.in_hdlc_tx = 0;
683 s->hdlctx.tx_state = 1;
684 s->hdlctx.numflags = 0;
685 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
686 s->hdlctx.ptt = 0;
687 s->hdlctx.slotcnt = s->ch_params.slottime;
688 s->hdlctx.calibrate = 0;
689
690 #ifdef HDLCDRV_DEBUG
691 s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0;
692 s->bitbuf_channel.shreg = 0x80;
693
694 s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0;
695 s->bitbuf_hdlc.shreg = 0x80;
696 #endif /* HDLCDRV_DEBUG */
697
698 /*
699 * initialize the device struct
700 */
701 dev->open = hdlcdrv_open;
702 dev->stop = hdlcdrv_close;
703 dev->do_ioctl = hdlcdrv_ioctl;
704 dev->hard_start_xmit = hdlcdrv_send_packet;
705 dev->get_stats = hdlcdrv_get_stats;
706
707 /* Fill in the fields of the device structure */
708
709 s->skb = NULL;
710
711 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
712 dev->hard_header = ax25_encapsulate;
713 dev->rebuild_header = ax25_rebuild_header;
714 #else /* CONFIG_AX25 || CONFIG_AX25_MODULE */
715 dev->hard_header = NULL;
716 dev->rebuild_header = NULL;
717 #endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
718 dev->set_mac_address = hdlcdrv_set_mac_address;
719
720 dev->type = ARPHRD_AX25; /* AF_AX25 device */
721 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
722 dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */
723 dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */
724 memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
725 memcpy(dev->dev_addr, ax25_nocall, AX25_ADDR_LEN);
726 dev->tx_queue_len = 16;
727 }
728
729 /* --------------------------------------------------------------------- */
730 struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops,
731 unsigned int privsize, const char *ifname,
732 unsigned int baseaddr, unsigned int irq,
733 unsigned int dma)
734 {
735 struct net_device *dev;
736 struct hdlcdrv_state *s;
737 int err;
738
739 BUG_ON(ops == NULL);
740
741 if (privsize < sizeof(struct hdlcdrv_state))
742 privsize = sizeof(struct hdlcdrv_state);
743
744 dev = alloc_netdev(privsize, ifname, hdlcdrv_setup);
745 if (!dev)
746 return ERR_PTR(-ENOMEM);
747
748 /*
749 * initialize part of the hdlcdrv_state struct
750 */
751 s = netdev_priv(dev);
752 s->magic = HDLCDRV_MAGIC;
753 s->ops = ops;
754 dev->base_addr = baseaddr;
755 dev->irq = irq;
756 dev->dma = dma;
757
758 err = register_netdev(dev);
759 if (err < 0) {
760 printk(KERN_WARNING "hdlcdrv: cannot register net "
761 "device %s\n", dev->name);
762 free_netdev(dev);
763 dev = ERR_PTR(err);
764 }
765 return dev;
766 }
767
768 /* --------------------------------------------------------------------- */
769
770 void hdlcdrv_unregister(struct net_device *dev)
771 {
772 struct hdlcdrv_state *s = netdev_priv(dev);
773
774 BUG_ON(s->magic != HDLCDRV_MAGIC);
775
776 if (s->opened && s->ops->close)
777 s->ops->close(dev);
778 unregister_netdev(dev);
779
780 free_netdev(dev);
781 }
782
783 /* --------------------------------------------------------------------- */
784
785 EXPORT_SYMBOL(hdlcdrv_receiver);
786 EXPORT_SYMBOL(hdlcdrv_transmitter);
787 EXPORT_SYMBOL(hdlcdrv_arbitrate);
788 EXPORT_SYMBOL(hdlcdrv_register);
789 EXPORT_SYMBOL(hdlcdrv_unregister);
790
791 /* --------------------------------------------------------------------- */
792
793 static int __init hdlcdrv_init_driver(void)
794 {
795 printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n");
796 printk(KERN_INFO "hdlcdrv: version 0.8 compiled " __TIME__ " " __DATE__ "\n");
797 return 0;
798 }
799
800 /* --------------------------------------------------------------------- */
801
802 static void __exit hdlcdrv_cleanup_driver(void)
803 {
804 printk(KERN_INFO "hdlcdrv: cleanup\n");
805 }
806
807 /* --------------------------------------------------------------------- */
808
809 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
810 MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder");
811 MODULE_LICENSE("GPL");
812 module_init(hdlcdrv_init_driver);
813 module_exit(hdlcdrv_cleanup_driver);
814
815 /* --------------------------------------------------------------------- */
Verdex Pro support