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uwb: fix oops when terminating an already terminated reservation
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / hamradio / hdlcdrv.c
blobc258a0586e611d641c134f53114c76df0025ec66
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/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>
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 <asm/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 s->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->last_rx = jiffies;
166 s->stats.rx_packets++;
167 }
168
169 void hdlcdrv_receiver(struct net_device *dev, struct hdlcdrv_state *s)
170 {
171 int i;
172 unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word;
173
174 if (!s || s->magic != HDLCDRV_MAGIC)
175 return;
176 if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx))
177 return;
178
179 while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) {
180 word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf);
181
182 #ifdef HDLCDRV_DEBUG
183 hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word);
184 #endif /* HDLCDRV_DEBUG */
185 s->hdlcrx.bitstream >>= 16;
186 s->hdlcrx.bitstream |= word << 16;
187 s->hdlcrx.bitbuf >>= 16;
188 s->hdlcrx.bitbuf |= word << 16;
189 s->hdlcrx.numbits += 16;
190 for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00,
191 mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff;
192 i >= 0;
193 i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1,
194 mask5 <<= 1, mask6 = (mask6 << 1) | 1) {
195 if ((s->hdlcrx.bitstream & mask1) == mask1)
196 s->hdlcrx.rx_state = 0; /* abort received */
197 else if ((s->hdlcrx.bitstream & mask2) == mask3) {
198 /* flag received */
199 if (s->hdlcrx.rx_state) {
200 hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf
201 << (8+i),
202 s->hdlcrx.numbits
203 -8-i);
204 hdlc_rx_flag(dev, s);
205 }
206 s->hdlcrx.len = 0;
207 s->hdlcrx.bp = s->hdlcrx.buffer;
208 s->hdlcrx.rx_state = 1;
209 s->hdlcrx.numbits = i;
210 } else if ((s->hdlcrx.bitstream & mask4) == mask5) {
211 /* stuffed bit */
212 s->hdlcrx.numbits--;
213 s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) |
214 ((s->hdlcrx.bitbuf & mask6) << 1);
215 }
216 }
217 s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf,
218 s->hdlcrx.numbits);
219 }
220 clear_bit(0, &s->hdlcrx.in_hdlc_rx);
221 }
222
223 /* ---------------------------------------------------------------------- */
224
225 static inline void do_kiss_params(struct hdlcdrv_state *s,
226 unsigned char *data, unsigned long len)
227 {
228
229 #ifdef KISS_VERBOSE
230 #define PKP(a,b) printk(KERN_INFO "hdlcdrv.c: channel params: " a "\n", b)
231 #else /* KISS_VERBOSE */
232 #define PKP(a,b)
233 #endif /* KISS_VERBOSE */
234
235 if (len < 2)
236 return;
237 switch(data[0]) {
238 case PARAM_TXDELAY:
239 s->ch_params.tx_delay = data[1];
240 PKP("TX delay = %ums", 10 * s->ch_params.tx_delay);
241 break;
242 case PARAM_PERSIST:
243 s->ch_params.ppersist = data[1];
244 PKP("p persistence = %u", s->ch_params.ppersist);
245 break;
246 case PARAM_SLOTTIME:
247 s->ch_params.slottime = data[1];
248 PKP("slot time = %ums", s->ch_params.slottime);
249 break;
250 case PARAM_TXTAIL:
251 s->ch_params.tx_tail = data[1];
252 PKP("TX tail = %ums", s->ch_params.tx_tail);
253 break;
254 case PARAM_FULLDUP:
255 s->ch_params.fulldup = !!data[1];
256 PKP("%s duplex", s->ch_params.fulldup ? "full" : "half");
257 break;
258 default:
259 break;
260 }
261 #undef PKP
262 }
263
264 /* ---------------------------------------------------------------------- */
265
266 void hdlcdrv_transmitter(struct net_device *dev, struct hdlcdrv_state *s)
267 {
268 unsigned int mask1, mask2, mask3;
269 int i;
270 struct sk_buff *skb;
271 int pkt_len;
272
273 if (!s || s->magic != HDLCDRV_MAGIC)
274 return;
275 if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx))
276 return;
277 for (;;) {
278 if (s->hdlctx.numbits >= 16) {
279 if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) {
280 clear_bit(0, &s->hdlctx.in_hdlc_tx);
281 return;
282 }
283 hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf);
284 s->hdlctx.bitbuf >>= 16;
285 s->hdlctx.numbits -= 16;
286 }
287 switch (s->hdlctx.tx_state) {
288 default:
289 clear_bit(0, &s->hdlctx.in_hdlc_tx);
290 return;
291 case 0:
292 case 1:
293 if (s->hdlctx.numflags) {
294 s->hdlctx.numflags--;
295 s->hdlctx.bitbuf |=
296 0x7e7e << s->hdlctx.numbits;
297 s->hdlctx.numbits += 16;
298 break;
299 }
300 if (s->hdlctx.tx_state == 1) {
301 clear_bit(0, &s->hdlctx.in_hdlc_tx);
302 return;
303 }
304 if (!(skb = s->skb)) {
305 int flgs = tenms_to_2flags(s, s->ch_params.tx_tail);
306 if (flgs < 2)
307 flgs = 2;
308 s->hdlctx.tx_state = 1;
309 s->hdlctx.numflags = flgs;
310 break;
311 }
312 s->skb = NULL;
313 netif_wake_queue(dev);
314 pkt_len = skb->len-1; /* strip KISS byte */
315 if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) {
316 s->hdlctx.tx_state = 0;
317 s->hdlctx.numflags = 1;
318 dev_kfree_skb_irq(skb);
319 break;
320 }
321 skb_copy_from_linear_data_offset(skb, 1,
322 s->hdlctx.buffer,
323 pkt_len);
324 dev_kfree_skb_irq(skb);
325 s->hdlctx.bp = s->hdlctx.buffer;
326 append_crc_ccitt(s->hdlctx.buffer, pkt_len);
327 s->hdlctx.len = pkt_len+2; /* the appended CRC */
328 s->hdlctx.tx_state = 2;
329 s->hdlctx.bitstream = 0;
330 s->stats.tx_packets++;
331 break;
332 case 2:
333 if (!s->hdlctx.len) {
334 s->hdlctx.tx_state = 0;
335 s->hdlctx.numflags = 1;
336 break;
337 }
338 s->hdlctx.len--;
339 s->hdlctx.bitbuf |= *s->hdlctx.bp <<
340 s->hdlctx.numbits;
341 s->hdlctx.bitstream >>= 8;
342 s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16;
343 mask1 = 0x1f000;
344 mask2 = 0x10000;
345 mask3 = 0xffffffff >> (31-s->hdlctx.numbits);
346 s->hdlctx.numbits += 8;
347 for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1,
348 mask3 = (mask3 << 1) | 1) {
349 if ((s->hdlctx.bitstream & mask1) != mask1)
350 continue;
351 s->hdlctx.bitstream &= ~mask2;
352 s->hdlctx.bitbuf =
353 (s->hdlctx.bitbuf & mask3) |
354 ((s->hdlctx.bitbuf &
355 (~mask3)) << 1);
356 s->hdlctx.numbits++;
357 mask3 = (mask3 << 1) | 1;
358 }
359 break;
360 }
361 }
362 }
363
364 /* ---------------------------------------------------------------------- */
365
366 static void start_tx(struct net_device *dev, struct hdlcdrv_state *s)
367 {
368 s->hdlctx.tx_state = 0;
369 s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay);
370 s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0;
371 hdlcdrv_transmitter(dev, s);
372 s->hdlctx.ptt = 1;
373 s->ptt_keyed++;
374 }
375
376 /* ---------------------------------------------------------------------- */
377
378 void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s)
379 {
380 if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb)
381 return;
382 if (s->ch_params.fulldup) {
383 start_tx(dev, s);
384 return;
385 }
386 if (s->hdlcrx.dcd) {
387 s->hdlctx.slotcnt = s->ch_params.slottime;
388 return;
389 }
390 if ((--s->hdlctx.slotcnt) > 0)
391 return;
392 s->hdlctx.slotcnt = s->ch_params.slottime;
393 if ((random32() % 256) > s->ch_params.ppersist)
394 return;
395 start_tx(dev, s);
396 }
397
398 /* --------------------------------------------------------------------- */
399 /*
400 * ===================== network driver interface =========================
401 */
402
403 static int hdlcdrv_send_packet(struct sk_buff *skb, struct net_device *dev)
404 {
405 struct hdlcdrv_state *sm = netdev_priv(dev);
406
407 if (skb->data[0] != 0) {
408 do_kiss_params(sm, skb->data, skb->len);
409 dev_kfree_skb(skb);
410 return 0;
411 }
412 if (sm->skb)
413 return -1;
414 netif_stop_queue(dev);
415 sm->skb = skb;
416 return 0;
417 }
418
419 /* --------------------------------------------------------------------- */
420
421 static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr)
422 {
423 struct sockaddr *sa = (struct sockaddr *)addr;
424
425 /* addr is an AX.25 shifted ASCII mac address */
426 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
427 return 0;
428 }
429
430 /* --------------------------------------------------------------------- */
431
432 static struct net_device_stats *hdlcdrv_get_stats(struct net_device *dev)
433 {
434 struct hdlcdrv_state *sm = netdev_priv(dev);
435
436 /*
437 * Get the current statistics. This may be called with the
438 * card open or closed.
439 */
440 return &sm->stats;
441 }
442
443 /* --------------------------------------------------------------------- */
444 /*
445 * Open/initialize the board. This is called (in the current kernel)
446 * sometime after booting when the 'ifconfig' program is run.
447 *
448 * This routine should set everything up anew at each open, even
449 * registers that "should" only need to be set once at boot, so that
450 * there is non-reboot way to recover if something goes wrong.
451 */
452
453 static int hdlcdrv_open(struct net_device *dev)
454 {
455 struct hdlcdrv_state *s = netdev_priv(dev);
456 int i;
457
458 if (!s->ops || !s->ops->open)
459 return -ENODEV;
460
461 /*
462 * initialise some variables
463 */
464 s->opened = 1;
465 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
466 s->hdlcrx.in_hdlc_rx = 0;
467 s->hdlcrx.rx_state = 0;
468
469 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
470 s->hdlctx.in_hdlc_tx = 0;
471 s->hdlctx.tx_state = 1;
472 s->hdlctx.numflags = 0;
473 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
474 s->hdlctx.ptt = 0;
475 s->hdlctx.slotcnt = s->ch_params.slottime;
476 s->hdlctx.calibrate = 0;
477
478 i = s->ops->open(dev);
479 if (i)
480 return i;
481 netif_start_queue(dev);
482 return 0;
483 }
484
485 /* --------------------------------------------------------------------- */
486 /*
487 * The inverse routine to hdlcdrv_open().
488 */
489
490 static int hdlcdrv_close(struct net_device *dev)
491 {
492 struct hdlcdrv_state *s = netdev_priv(dev);
493 int i = 0;
494
495 netif_stop_queue(dev);
496
497 if (s->ops && s->ops->close)
498 i = s->ops->close(dev);
499 if (s->skb)
500 dev_kfree_skb(s->skb);
501 s->skb = NULL;
502 s->opened = 0;
503 return i;
504 }
505
506 /* --------------------------------------------------------------------- */
507
508 static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
509 {
510 struct hdlcdrv_state *s = netdev_priv(dev);
511 struct hdlcdrv_ioctl bi;
512
513 if (cmd != SIOCDEVPRIVATE) {
514 if (s->ops && s->ops->ioctl)
515 return s->ops->ioctl(dev, ifr, &bi, cmd);
516 return -ENOIOCTLCMD;
517 }
518 if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
519 return -EFAULT;
520
521 switch (bi.cmd) {
522 default:
523 if (s->ops && s->ops->ioctl)
524 return s->ops->ioctl(dev, ifr, &bi, cmd);
525 return -ENOIOCTLCMD;
526
527 case HDLCDRVCTL_GETCHANNELPAR:
528 bi.data.cp.tx_delay = s->ch_params.tx_delay;
529 bi.data.cp.tx_tail = s->ch_params.tx_tail;
530 bi.data.cp.slottime = s->ch_params.slottime;
531 bi.data.cp.ppersist = s->ch_params.ppersist;
532 bi.data.cp.fulldup = s->ch_params.fulldup;
533 break;
534
535 case HDLCDRVCTL_SETCHANNELPAR:
536 if (!capable(CAP_NET_ADMIN))
537 return -EACCES;
538 s->ch_params.tx_delay = bi.data.cp.tx_delay;
539 s->ch_params.tx_tail = bi.data.cp.tx_tail;
540 s->ch_params.slottime = bi.data.cp.slottime;
541 s->ch_params.ppersist = bi.data.cp.ppersist;
542 s->ch_params.fulldup = bi.data.cp.fulldup;
543 s->hdlctx.slotcnt = 1;
544 return 0;
545
546 case HDLCDRVCTL_GETMODEMPAR:
547 bi.data.mp.iobase = dev->base_addr;
548 bi.data.mp.irq = dev->irq;
549 bi.data.mp.dma = dev->dma;
550 bi.data.mp.dma2 = s->ptt_out.dma2;
551 bi.data.mp.seriobase = s->ptt_out.seriobase;
552 bi.data.mp.pariobase = s->ptt_out.pariobase;
553 bi.data.mp.midiiobase = s->ptt_out.midiiobase;
554 break;
555
556 case HDLCDRVCTL_SETMODEMPAR:
557 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
558 return -EACCES;
559 dev->base_addr = bi.data.mp.iobase;
560 dev->irq = bi.data.mp.irq;
561 dev->dma = bi.data.mp.dma;
562 s->ptt_out.dma2 = bi.data.mp.dma2;
563 s->ptt_out.seriobase = bi.data.mp.seriobase;
564 s->ptt_out.pariobase = bi.data.mp.pariobase;
565 s->ptt_out.midiiobase = bi.data.mp.midiiobase;
566 return 0;
567
568 case HDLCDRVCTL_GETSTAT:
569 bi.data.cs.ptt = hdlcdrv_ptt(s);
570 bi.data.cs.dcd = s->hdlcrx.dcd;
571 bi.data.cs.ptt_keyed = s->ptt_keyed;
572 bi.data.cs.tx_packets = s->stats.tx_packets;
573 bi.data.cs.tx_errors = s->stats.tx_errors;
574 bi.data.cs.rx_packets = s->stats.rx_packets;
575 bi.data.cs.rx_errors = s->stats.rx_errors;
576 break;
577
578 case HDLCDRVCTL_OLDGETSTAT:
579 bi.data.ocs.ptt = hdlcdrv_ptt(s);
580 bi.data.ocs.dcd = s->hdlcrx.dcd;
581 bi.data.ocs.ptt_keyed = s->ptt_keyed;
582 break;
583
584 case HDLCDRVCTL_CALIBRATE:
585 if(!capable(CAP_SYS_RAWIO))
586 return -EPERM;
587 s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16;
588 return 0;
589
590 case HDLCDRVCTL_GETSAMPLES:
591 #ifndef HDLCDRV_DEBUG
592 return -EPERM;
593 #else /* HDLCDRV_DEBUG */
594 if (s->bitbuf_channel.rd == s->bitbuf_channel.wr)
595 return -EAGAIN;
596 bi.data.bits =
597 s->bitbuf_channel.buffer[s->bitbuf_channel.rd];
598 s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) %
599 sizeof(s->bitbuf_channel.buffer);
600 break;
601 #endif /* HDLCDRV_DEBUG */
602
603 case HDLCDRVCTL_GETBITS:
604 #ifndef HDLCDRV_DEBUG
605 return -EPERM;
606 #else /* HDLCDRV_DEBUG */
607 if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr)
608 return -EAGAIN;
609 bi.data.bits =
610 s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd];
611 s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) %
612 sizeof(s->bitbuf_hdlc.buffer);
613 break;
614 #endif /* HDLCDRV_DEBUG */
615
616 case HDLCDRVCTL_DRIVERNAME:
617 if (s->ops && s->ops->drvname) {
618 strncpy(bi.data.drivername, s->ops->drvname,
619 sizeof(bi.data.drivername));
620 break;
621 }
622 bi.data.drivername[0] = '\0';
623 break;
624
625 }
626 if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
627 return -EFAULT;
628 return 0;
629
630 }
631
632 /* --------------------------------------------------------------------- */
633
634 /*
635 * Initialize fields in hdlcdrv
636 */
637 static void hdlcdrv_setup(struct net_device *dev)
638 {
639 static const struct hdlcdrv_channel_params dflt_ch_params = {
640 20, 2, 10, 40, 0
641 };
642 struct hdlcdrv_state *s = netdev_priv(dev);
643
644 /*
645 * initialize the hdlcdrv_state struct
646 */
647 s->ch_params = dflt_ch_params;
648 s->ptt_keyed = 0;
649
650 spin_lock_init(&s->hdlcrx.hbuf.lock);
651 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
652 s->hdlcrx.in_hdlc_rx = 0;
653 s->hdlcrx.rx_state = 0;
654
655 spin_lock_init(&s->hdlctx.hbuf.lock);
656 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
657 s->hdlctx.in_hdlc_tx = 0;
658 s->hdlctx.tx_state = 1;
659 s->hdlctx.numflags = 0;
660 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
661 s->hdlctx.ptt = 0;
662 s->hdlctx.slotcnt = s->ch_params.slottime;
663 s->hdlctx.calibrate = 0;
664
665 #ifdef HDLCDRV_DEBUG
666 s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0;
667 s->bitbuf_channel.shreg = 0x80;
668
669 s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0;
670 s->bitbuf_hdlc.shreg = 0x80;
671 #endif /* HDLCDRV_DEBUG */
672
673 /*
674 * initialize the device struct
675 */
676 dev->open = hdlcdrv_open;
677 dev->stop = hdlcdrv_close;
678 dev->do_ioctl = hdlcdrv_ioctl;
679 dev->hard_start_xmit = hdlcdrv_send_packet;
680 dev->get_stats = hdlcdrv_get_stats;
681
682 /* Fill in the fields of the device structure */
683
684 s->skb = NULL;
685
686 dev->header_ops = &ax25_header_ops;
687 dev->set_mac_address = hdlcdrv_set_mac_address;
688
689 dev->type = ARPHRD_AX25; /* AF_AX25 device */
690 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
691 dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */
692 dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */
693 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
694 memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN);
695 dev->tx_queue_len = 16;
696 }
697
698 /* --------------------------------------------------------------------- */
699 struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops,
700 unsigned int privsize, const char *ifname,
701 unsigned int baseaddr, unsigned int irq,
702 unsigned int dma)
703 {
704 struct net_device *dev;
705 struct hdlcdrv_state *s;
706 int err;
707
708 BUG_ON(ops == NULL);
709
710 if (privsize < sizeof(struct hdlcdrv_state))
711 privsize = sizeof(struct hdlcdrv_state);
712
713 dev = alloc_netdev(privsize, ifname, hdlcdrv_setup);
714 if (!dev)
715 return ERR_PTR(-ENOMEM);
716
717 /*
718 * initialize part of the hdlcdrv_state struct
719 */
720 s = netdev_priv(dev);
721 s->magic = HDLCDRV_MAGIC;
722 s->ops = ops;
723 dev->base_addr = baseaddr;
724 dev->irq = irq;
725 dev->dma = dma;
726
727 err = register_netdev(dev);
728 if (err < 0) {
729 printk(KERN_WARNING "hdlcdrv: cannot register net "
730 "device %s\n", dev->name);
731 free_netdev(dev);
732 dev = ERR_PTR(err);
733 }
734 return dev;
735 }
736
737 /* --------------------------------------------------------------------- */
738
739 void hdlcdrv_unregister(struct net_device *dev)
740 {
741 struct hdlcdrv_state *s = netdev_priv(dev);
742
743 BUG_ON(s->magic != HDLCDRV_MAGIC);
744
745 if (s->opened && s->ops->close)
746 s->ops->close(dev);
747 unregister_netdev(dev);
748
749 free_netdev(dev);
750 }
751
752 /* --------------------------------------------------------------------- */
753
754 EXPORT_SYMBOL(hdlcdrv_receiver);
755 EXPORT_SYMBOL(hdlcdrv_transmitter);
756 EXPORT_SYMBOL(hdlcdrv_arbitrate);
757 EXPORT_SYMBOL(hdlcdrv_register);
758 EXPORT_SYMBOL(hdlcdrv_unregister);
759
760 /* --------------------------------------------------------------------- */
761
762 static int __init hdlcdrv_init_driver(void)
763 {
764 printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n");
765 printk(KERN_INFO "hdlcdrv: version 0.8 compiled " __TIME__ " " __DATE__ "\n");
766 return 0;
767 }
768
769 /* --------------------------------------------------------------------- */
770
771 static void __exit hdlcdrv_cleanup_driver(void)
772 {
773 printk(KERN_INFO "hdlcdrv: cleanup\n");
774 }
775
776 /* --------------------------------------------------------------------- */
777
778 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
779 MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder");
780 MODULE_LICENSE("GPL");
781 module_init(hdlcdrv_init_driver);
782 module_exit(hdlcdrv_cleanup_driver);
783
784 /* --------------------------------------------------------------------- */
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree