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Linux-2.6.12-rc2
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / hamradio / hdlcdrv.c
blobb89959a596d7f615e2db9f4b23a27980e11c551f
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 skb->dev = dev;
178 cp = skb_put(skb, pkt_len);
179 *cp++ = 0; /* KISS kludge */
180 memcpy(cp, s->hdlcrx.buffer, pkt_len - 1);
181 skb->protocol = htons(ETH_P_AX25);
182 skb->mac.raw = skb->data;
183 netif_rx(skb);
184 dev->last_rx = jiffies;
185 s->stats.rx_packets++;
186 }
187
188 void hdlcdrv_receiver(struct net_device *dev, struct hdlcdrv_state *s)
189 {
190 int i;
191 unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word;
192
193 if (!s || s->magic != HDLCDRV_MAGIC)
194 return;
195 if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx))
196 return;
197
198 while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) {
199 word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf);
200
201 #ifdef HDLCDRV_DEBUG
202 hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word);
203 #endif /* HDLCDRV_DEBUG */
204 s->hdlcrx.bitstream >>= 16;
205 s->hdlcrx.bitstream |= word << 16;
206 s->hdlcrx.bitbuf >>= 16;
207 s->hdlcrx.bitbuf |= word << 16;
208 s->hdlcrx.numbits += 16;
209 for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00,
210 mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff;
211 i >= 0;
212 i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1,
213 mask5 <<= 1, mask6 = (mask6 << 1) | 1) {
214 if ((s->hdlcrx.bitstream & mask1) == mask1)
215 s->hdlcrx.rx_state = 0; /* abort received */
216 else if ((s->hdlcrx.bitstream & mask2) == mask3) {
217 /* flag received */
218 if (s->hdlcrx.rx_state) {
219 hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf
220 << (8+i),
221 s->hdlcrx.numbits
222 -8-i);
223 hdlc_rx_flag(dev, s);
224 }
225 s->hdlcrx.len = 0;
226 s->hdlcrx.bp = s->hdlcrx.buffer;
227 s->hdlcrx.rx_state = 1;
228 s->hdlcrx.numbits = i;
229 } else if ((s->hdlcrx.bitstream & mask4) == mask5) {
230 /* stuffed bit */
231 s->hdlcrx.numbits--;
232 s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) |
233 ((s->hdlcrx.bitbuf & mask6) << 1);
234 }
235 }
236 s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf,
237 s->hdlcrx.numbits);
238 }
239 clear_bit(0, &s->hdlcrx.in_hdlc_rx);
240 }
241
242 /* ---------------------------------------------------------------------- */
243
244 static inline void do_kiss_params(struct hdlcdrv_state *s,
245 unsigned char *data, unsigned long len)
246 {
247
248 #ifdef KISS_VERBOSE
249 #define PKP(a,b) printk(KERN_INFO "hdlcdrv.c: channel params: " a "\n", b)
250 #else /* KISS_VERBOSE */
251 #define PKP(a,b)
252 #endif /* KISS_VERBOSE */
253
254 if (len < 2)
255 return;
256 switch(data[0]) {
257 case PARAM_TXDELAY:
258 s->ch_params.tx_delay = data[1];
259 PKP("TX delay = %ums", 10 * s->ch_params.tx_delay);
260 break;
261 case PARAM_PERSIST:
262 s->ch_params.ppersist = data[1];
263 PKP("p persistence = %u", s->ch_params.ppersist);
264 break;
265 case PARAM_SLOTTIME:
266 s->ch_params.slottime = data[1];
267 PKP("slot time = %ums", s->ch_params.slottime);
268 break;
269 case PARAM_TXTAIL:
270 s->ch_params.tx_tail = data[1];
271 PKP("TX tail = %ums", s->ch_params.tx_tail);
272 break;
273 case PARAM_FULLDUP:
274 s->ch_params.fulldup = !!data[1];
275 PKP("%s duplex", s->ch_params.fulldup ? "full" : "half");
276 break;
277 default:
278 break;
279 }
280 #undef PKP
281 }
282
283 /* ---------------------------------------------------------------------- */
284
285 void hdlcdrv_transmitter(struct net_device *dev, struct hdlcdrv_state *s)
286 {
287 unsigned int mask1, mask2, mask3;
288 int i;
289 struct sk_buff *skb;
290 int pkt_len;
291
292 if (!s || s->magic != HDLCDRV_MAGIC)
293 return;
294 if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx))
295 return;
296 for (;;) {
297 if (s->hdlctx.numbits >= 16) {
298 if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) {
299 clear_bit(0, &s->hdlctx.in_hdlc_tx);
300 return;
301 }
302 hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf);
303 s->hdlctx.bitbuf >>= 16;
304 s->hdlctx.numbits -= 16;
305 }
306 switch (s->hdlctx.tx_state) {
307 default:
308 clear_bit(0, &s->hdlctx.in_hdlc_tx);
309 return;
310 case 0:
311 case 1:
312 if (s->hdlctx.numflags) {
313 s->hdlctx.numflags--;
314 s->hdlctx.bitbuf |=
315 0x7e7e << s->hdlctx.numbits;
316 s->hdlctx.numbits += 16;
317 break;
318 }
319 if (s->hdlctx.tx_state == 1) {
320 clear_bit(0, &s->hdlctx.in_hdlc_tx);
321 return;
322 }
323 if (!(skb = s->skb)) {
324 int flgs = tenms_to_2flags(s, s->ch_params.tx_tail);
325 if (flgs < 2)
326 flgs = 2;
327 s->hdlctx.tx_state = 1;
328 s->hdlctx.numflags = flgs;
329 break;
330 }
331 s->skb = NULL;
332 netif_wake_queue(dev);
333 pkt_len = skb->len-1; /* strip KISS byte */
334 if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) {
335 s->hdlctx.tx_state = 0;
336 s->hdlctx.numflags = 1;
337 dev_kfree_skb_irq(skb);
338 break;
339 }
340 memcpy(s->hdlctx.buffer, skb->data+1, pkt_len);
341 dev_kfree_skb_irq(skb);
342 s->hdlctx.bp = s->hdlctx.buffer;
343 append_crc_ccitt(s->hdlctx.buffer, pkt_len);
344 s->hdlctx.len = pkt_len+2; /* the appended CRC */
345 s->hdlctx.tx_state = 2;
346 s->hdlctx.bitstream = 0;
347 s->stats.tx_packets++;
348 break;
349 case 2:
350 if (!s->hdlctx.len) {
351 s->hdlctx.tx_state = 0;
352 s->hdlctx.numflags = 1;
353 break;
354 }
355 s->hdlctx.len--;
356 s->hdlctx.bitbuf |= *s->hdlctx.bp <<
357 s->hdlctx.numbits;
358 s->hdlctx.bitstream >>= 8;
359 s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16;
360 mask1 = 0x1f000;
361 mask2 = 0x10000;
362 mask3 = 0xffffffff >> (31-s->hdlctx.numbits);
363 s->hdlctx.numbits += 8;
364 for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1,
365 mask3 = (mask3 << 1) | 1) {
366 if ((s->hdlctx.bitstream & mask1) != mask1)
367 continue;
368 s->hdlctx.bitstream &= ~mask2;
369 s->hdlctx.bitbuf =
370 (s->hdlctx.bitbuf & mask3) |
371 ((s->hdlctx.bitbuf &
372 (~mask3)) << 1);
373 s->hdlctx.numbits++;
374 mask3 = (mask3 << 1) | 1;
375 }
376 break;
377 }
378 }
379 }
380
381 /* ---------------------------------------------------------------------- */
382
383 static void start_tx(struct net_device *dev, struct hdlcdrv_state *s)
384 {
385 s->hdlctx.tx_state = 0;
386 s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay);
387 s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0;
388 hdlcdrv_transmitter(dev, s);
389 s->hdlctx.ptt = 1;
390 s->ptt_keyed++;
391 }
392
393 /* ---------------------------------------------------------------------- */
394
395 static unsigned short random_seed;
396
397 static inline unsigned short random_num(void)
398 {
399 random_seed = 28629 * random_seed + 157;
400 return random_seed;
401 }
402
403 /* ---------------------------------------------------------------------- */
404
405 void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s)
406 {
407 if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb)
408 return;
409 if (s->ch_params.fulldup) {
410 start_tx(dev, s);
411 return;
412 }
413 if (s->hdlcrx.dcd) {
414 s->hdlctx.slotcnt = s->ch_params.slottime;
415 return;
416 }
417 if ((--s->hdlctx.slotcnt) > 0)
418 return;
419 s->hdlctx.slotcnt = s->ch_params.slottime;
420 if ((random_num() % 256) > s->ch_params.ppersist)
421 return;
422 start_tx(dev, s);
423 }
424
425 /* --------------------------------------------------------------------- */
426 /*
427 * ===================== network driver interface =========================
428 */
429
430 static int hdlcdrv_send_packet(struct sk_buff *skb, struct net_device *dev)
431 {
432 struct hdlcdrv_state *sm = netdev_priv(dev);
433
434 if (skb->data[0] != 0) {
435 do_kiss_params(sm, skb->data, skb->len);
436 dev_kfree_skb(skb);
437 return 0;
438 }
439 if (sm->skb)
440 return -1;
441 netif_stop_queue(dev);
442 sm->skb = skb;
443 return 0;
444 }
445
446 /* --------------------------------------------------------------------- */
447
448 static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr)
449 {
450 struct sockaddr *sa = (struct sockaddr *)addr;
451
452 /* addr is an AX.25 shifted ASCII mac address */
453 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
454 return 0;
455 }
456
457 /* --------------------------------------------------------------------- */
458
459 static struct net_device_stats *hdlcdrv_get_stats(struct net_device *dev)
460 {
461 struct hdlcdrv_state *sm = netdev_priv(dev);
462
463 /*
464 * Get the current statistics. This may be called with the
465 * card open or closed.
466 */
467 return &sm->stats;
468 }
469
470 /* --------------------------------------------------------------------- */
471 /*
472 * Open/initialize the board. This is called (in the current kernel)
473 * sometime after booting when the 'ifconfig' program is run.
474 *
475 * This routine should set everything up anew at each open, even
476 * registers that "should" only need to be set once at boot, so that
477 * there is non-reboot way to recover if something goes wrong.
478 */
479
480 static int hdlcdrv_open(struct net_device *dev)
481 {
482 struct hdlcdrv_state *s = netdev_priv(dev);
483 int i;
484
485 if (!s->ops || !s->ops->open)
486 return -ENODEV;
487
488 /*
489 * initialise some variables
490 */
491 s->opened = 1;
492 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
493 s->hdlcrx.in_hdlc_rx = 0;
494 s->hdlcrx.rx_state = 0;
495
496 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
497 s->hdlctx.in_hdlc_tx = 0;
498 s->hdlctx.tx_state = 1;
499 s->hdlctx.numflags = 0;
500 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
501 s->hdlctx.ptt = 0;
502 s->hdlctx.slotcnt = s->ch_params.slottime;
503 s->hdlctx.calibrate = 0;
504
505 i = s->ops->open(dev);
506 if (i)
507 return i;
508 netif_start_queue(dev);
509 return 0;
510 }
511
512 /* --------------------------------------------------------------------- */
513 /*
514 * The inverse routine to hdlcdrv_open().
515 */
516
517 static int hdlcdrv_close(struct net_device *dev)
518 {
519 struct hdlcdrv_state *s = netdev_priv(dev);
520 int i = 0;
521
522 netif_stop_queue(dev);
523
524 if (s->ops && s->ops->close)
525 i = s->ops->close(dev);
526 if (s->skb)
527 dev_kfree_skb(s->skb);
528 s->skb = NULL;
529 s->opened = 0;
530 return i;
531 }
532
533 /* --------------------------------------------------------------------- */
534
535 static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
536 {
537 struct hdlcdrv_state *s = netdev_priv(dev);
538 struct hdlcdrv_ioctl bi;
539
540 if (cmd != SIOCDEVPRIVATE) {
541 if (s->ops && s->ops->ioctl)
542 return s->ops->ioctl(dev, ifr, &bi, cmd);
543 return -ENOIOCTLCMD;
544 }
545 if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
546 return -EFAULT;
547
548 switch (bi.cmd) {
549 default:
550 if (s->ops && s->ops->ioctl)
551 return s->ops->ioctl(dev, ifr, &bi, cmd);
552 return -ENOIOCTLCMD;
553
554 case HDLCDRVCTL_GETCHANNELPAR:
555 bi.data.cp.tx_delay = s->ch_params.tx_delay;
556 bi.data.cp.tx_tail = s->ch_params.tx_tail;
557 bi.data.cp.slottime = s->ch_params.slottime;
558 bi.data.cp.ppersist = s->ch_params.ppersist;
559 bi.data.cp.fulldup = s->ch_params.fulldup;
560 break;
561
562 case HDLCDRVCTL_SETCHANNELPAR:
563 if (!capable(CAP_NET_ADMIN))
564 return -EACCES;
565 s->ch_params.tx_delay = bi.data.cp.tx_delay;
566 s->ch_params.tx_tail = bi.data.cp.tx_tail;
567 s->ch_params.slottime = bi.data.cp.slottime;
568 s->ch_params.ppersist = bi.data.cp.ppersist;
569 s->ch_params.fulldup = bi.data.cp.fulldup;
570 s->hdlctx.slotcnt = 1;
571 return 0;
572
573 case HDLCDRVCTL_GETMODEMPAR:
574 bi.data.mp.iobase = dev->base_addr;
575 bi.data.mp.irq = dev->irq;
576 bi.data.mp.dma = dev->dma;
577 bi.data.mp.dma2 = s->ptt_out.dma2;
578 bi.data.mp.seriobase = s->ptt_out.seriobase;
579 bi.data.mp.pariobase = s->ptt_out.pariobase;
580 bi.data.mp.midiiobase = s->ptt_out.midiiobase;
581 break;
582
583 case HDLCDRVCTL_SETMODEMPAR:
584 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
585 return -EACCES;
586 dev->base_addr = bi.data.mp.iobase;
587 dev->irq = bi.data.mp.irq;
588 dev->dma = bi.data.mp.dma;
589 s->ptt_out.dma2 = bi.data.mp.dma2;
590 s->ptt_out.seriobase = bi.data.mp.seriobase;
591 s->ptt_out.pariobase = bi.data.mp.pariobase;
592 s->ptt_out.midiiobase = bi.data.mp.midiiobase;
593 return 0;
594
595 case HDLCDRVCTL_GETSTAT:
596 bi.data.cs.ptt = hdlcdrv_ptt(s);
597 bi.data.cs.dcd = s->hdlcrx.dcd;
598 bi.data.cs.ptt_keyed = s->ptt_keyed;
599 bi.data.cs.tx_packets = s->stats.tx_packets;
600 bi.data.cs.tx_errors = s->stats.tx_errors;
601 bi.data.cs.rx_packets = s->stats.rx_packets;
602 bi.data.cs.rx_errors = s->stats.rx_errors;
603 break;
604
605 case HDLCDRVCTL_OLDGETSTAT:
606 bi.data.ocs.ptt = hdlcdrv_ptt(s);
607 bi.data.ocs.dcd = s->hdlcrx.dcd;
608 bi.data.ocs.ptt_keyed = s->ptt_keyed;
609 break;
610
611 case HDLCDRVCTL_CALIBRATE:
612 if(!capable(CAP_SYS_RAWIO))
613 return -EPERM;
614 s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16;
615 return 0;
616
617 case HDLCDRVCTL_GETSAMPLES:
618 #ifndef HDLCDRV_DEBUG
619 return -EPERM;
620 #else /* HDLCDRV_DEBUG */
621 if (s->bitbuf_channel.rd == s->bitbuf_channel.wr)
622 return -EAGAIN;
623 bi.data.bits =
624 s->bitbuf_channel.buffer[s->bitbuf_channel.rd];
625 s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) %
626 sizeof(s->bitbuf_channel.buffer);
627 break;
628 #endif /* HDLCDRV_DEBUG */
629
630 case HDLCDRVCTL_GETBITS:
631 #ifndef HDLCDRV_DEBUG
632 return -EPERM;
633 #else /* HDLCDRV_DEBUG */
634 if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr)
635 return -EAGAIN;
636 bi.data.bits =
637 s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd];
638 s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) %
639 sizeof(s->bitbuf_hdlc.buffer);
640 break;
641 #endif /* HDLCDRV_DEBUG */
642
643 case HDLCDRVCTL_DRIVERNAME:
644 if (s->ops && s->ops->drvname) {
645 strncpy(bi.data.drivername, s->ops->drvname,
646 sizeof(bi.data.drivername));
647 break;
648 }
649 bi.data.drivername[0] = '\0';
650 break;
651
652 }
653 if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
654 return -EFAULT;
655 return 0;
656
657 }
658
659 /* --------------------------------------------------------------------- */
660
661 /*
662 * Initialize fields in hdlcdrv
663 */
664 static void hdlcdrv_setup(struct net_device *dev)
665 {
666 static const struct hdlcdrv_channel_params dflt_ch_params = {
667 20, 2, 10, 40, 0
668 };
669 struct hdlcdrv_state *s = netdev_priv(dev);
670
671 /*
672 * initialize the hdlcdrv_state struct
673 */
674 s->ch_params = dflt_ch_params;
675 s->ptt_keyed = 0;
676
677 spin_lock_init(&s->hdlcrx.hbuf.lock);
678 s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0;
679 s->hdlcrx.in_hdlc_rx = 0;
680 s->hdlcrx.rx_state = 0;
681
682 spin_lock_init(&s->hdlctx.hbuf.lock);
683 s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0;
684 s->hdlctx.in_hdlc_tx = 0;
685 s->hdlctx.tx_state = 1;
686 s->hdlctx.numflags = 0;
687 s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0;
688 s->hdlctx.ptt = 0;
689 s->hdlctx.slotcnt = s->ch_params.slottime;
690 s->hdlctx.calibrate = 0;
691
692 #ifdef HDLCDRV_DEBUG
693 s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0;
694 s->bitbuf_channel.shreg = 0x80;
695
696 s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0;
697 s->bitbuf_hdlc.shreg = 0x80;
698 #endif /* HDLCDRV_DEBUG */
699
700 /*
701 * initialize the device struct
702 */
703 dev->open = hdlcdrv_open;
704 dev->stop = hdlcdrv_close;
705 dev->do_ioctl = hdlcdrv_ioctl;
706 dev->hard_start_xmit = hdlcdrv_send_packet;
707 dev->get_stats = hdlcdrv_get_stats;
708
709 /* Fill in the fields of the device structure */
710
711 s->skb = NULL;
712
713 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
714 dev->hard_header = ax25_encapsulate;
715 dev->rebuild_header = ax25_rebuild_header;
716 #else /* CONFIG_AX25 || CONFIG_AX25_MODULE */
717 dev->hard_header = NULL;
718 dev->rebuild_header = NULL;
719 #endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
720 dev->set_mac_address = hdlcdrv_set_mac_address;
721
722 dev->type = ARPHRD_AX25; /* AF_AX25 device */
723 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
724 dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */
725 dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */
726 memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
727 memcpy(dev->dev_addr, ax25_nocall, AX25_ADDR_LEN);
728 dev->tx_queue_len = 16;
729 }
730
731 /* --------------------------------------------------------------------- */
732 struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops,
733 unsigned int privsize, const char *ifname,
734 unsigned int baseaddr, unsigned int irq,
735 unsigned int dma)
736 {
737 struct net_device *dev;
738 struct hdlcdrv_state *s;
739 int err;
740
741 BUG_ON(ops == NULL);
742
743 if (privsize < sizeof(struct hdlcdrv_state))
744 privsize = sizeof(struct hdlcdrv_state);
745
746 dev = alloc_netdev(privsize, ifname, hdlcdrv_setup);
747 if (!dev)
748 return ERR_PTR(-ENOMEM);
749
750 /*
751 * initialize part of the hdlcdrv_state struct
752 */
753 s = netdev_priv(dev);
754 s->magic = HDLCDRV_MAGIC;
755 s->ops = ops;
756 dev->base_addr = baseaddr;
757 dev->irq = irq;
758 dev->dma = dma;
759
760 err = register_netdev(dev);
761 if (err < 0) {
762 printk(KERN_WARNING "hdlcdrv: cannot register net "
763 "device %s\n", dev->name);
764 free_netdev(dev);
765 dev = ERR_PTR(err);
766 }
767 return dev;
768 }
769
770 /* --------------------------------------------------------------------- */
771
772 void hdlcdrv_unregister(struct net_device *dev)
773 {
774 struct hdlcdrv_state *s = netdev_priv(dev);
775
776 BUG_ON(s->magic != HDLCDRV_MAGIC);
777
778 if (s->opened && s->ops->close)
779 s->ops->close(dev);
780 unregister_netdev(dev);
781
782 free_netdev(dev);
783 }
784
785 /* --------------------------------------------------------------------- */
786
787 EXPORT_SYMBOL(hdlcdrv_receiver);
788 EXPORT_SYMBOL(hdlcdrv_transmitter);
789 EXPORT_SYMBOL(hdlcdrv_arbitrate);
790 EXPORT_SYMBOL(hdlcdrv_register);
791 EXPORT_SYMBOL(hdlcdrv_unregister);
792
793 /* --------------------------------------------------------------------- */
794
795 static int __init hdlcdrv_init_driver(void)
796 {
797 printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n");
798 printk(KERN_INFO "hdlcdrv: version 0.8 compiled " __TIME__ " " __DATE__ "\n");
799 return 0;
800 }
801
802 /* --------------------------------------------------------------------- */
803
804 static void __exit hdlcdrv_cleanup_driver(void)
805 {
806 printk(KERN_INFO "hdlcdrv: cleanup\n");
807 }
808
809 /* --------------------------------------------------------------------- */
810
811 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
812 MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder");
813 MODULE_LICENSE("GPL");
814 module_init(hdlcdrv_init_driver);
815 module_exit(hdlcdrv_cleanup_driver);
816
817 /* --------------------------------------------------------------------- */
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree