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1da177e4 LT |
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 | ||
1da177e4 LT |
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> | |
1da177e4 LT |
54 | |
55 | #include <linux/netdevice.h> | |
56 | #include <linux/if_arp.h> | |
1da177e4 LT |
57 | #include <linux/skbuff.h> |
58 | #include <linux/hdlcdrv.h> | |
1da177e4 | 59 | #include <net/ax25.h> |
c4bc7ee2 | 60 | #include <asm/uaccess.h> |
1da177e4 | 61 | |
1da177e4 LT |
62 | #include <linux/crc-ccitt.h> |
63 | ||
64 | /* --------------------------------------------------------------------- */ | |
65 | ||
1da177e4 LT |
66 | #define KISS_VERBOSE |
67 | ||
68 | /* --------------------------------------------------------------------- */ | |
69 | ||
70 | #define PARAM_TXDELAY 1 | |
71 | #define PARAM_PERSIST 2 | |
72 | #define PARAM_SLOTTIME 3 | |
73 | #define PARAM_TXTAIL 4 | |
74 | #define PARAM_FULLDUP 5 | |
75 | #define PARAM_HARDWARE 6 | |
76 | #define PARAM_RETURN 255 | |
77 | ||
78 | /* --------------------------------------------------------------------- */ | |
79 | /* | |
80 | * the CRC routines are stolen from WAMPES | |
81 | * by Dieter Deyke | |
82 | */ | |
83 | ||
84 | ||
85 | /*---------------------------------------------------------------------------*/ | |
86 | ||
87 | static inline void append_crc_ccitt(unsigned char *buffer, int len) | |
88 | { | |
89 | unsigned int crc = crc_ccitt(0xffff, buffer, len) ^ 0xffff; | |
90 | *buffer++ = crc; | |
91 | *buffer++ = crc >> 8; | |
92 | } | |
93 | ||
94 | /*---------------------------------------------------------------------------*/ | |
95 | ||
96 | static inline int check_crc_ccitt(const unsigned char *buf, int cnt) | |
97 | { | |
98 | return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8; | |
99 | } | |
100 | ||
101 | /*---------------------------------------------------------------------------*/ | |
102 | ||
103 | #if 0 | |
104 | static int calc_crc_ccitt(const unsigned char *buf, int cnt) | |
105 | { | |
106 | unsigned int crc = 0xffff; | |
107 | ||
108 | for (; cnt > 0; cnt--) | |
109 | crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff]; | |
110 | crc ^= 0xffff; | |
111 | return (crc & 0xffff); | |
112 | } | |
113 | #endif | |
114 | ||
115 | /* ---------------------------------------------------------------------- */ | |
116 | ||
117 | #define tenms_to_2flags(s,tenms) ((tenms * s->par.bitrate) / 100 / 16) | |
118 | ||
119 | /* ---------------------------------------------------------------------- */ | |
120 | /* | |
121 | * The HDLC routines | |
122 | */ | |
123 | ||
124 | static int hdlc_rx_add_bytes(struct hdlcdrv_state *s, unsigned int bits, | |
125 | int num) | |
126 | { | |
127 | int added = 0; | |
128 | ||
129 | while (s->hdlcrx.rx_state && num >= 8) { | |
130 | if (s->hdlcrx.len >= sizeof(s->hdlcrx.buffer)) { | |
131 | s->hdlcrx.rx_state = 0; | |
132 | return 0; | |
133 | } | |
134 | *s->hdlcrx.bp++ = bits >> (32-num); | |
135 | s->hdlcrx.len++; | |
136 | num -= 8; | |
137 | added += 8; | |
138 | } | |
139 | return added; | |
140 | } | |
141 | ||
142 | static void hdlc_rx_flag(struct net_device *dev, struct hdlcdrv_state *s) | |
143 | { | |
144 | struct sk_buff *skb; | |
145 | int pkt_len; | |
146 | unsigned char *cp; | |
147 | ||
148 | if (s->hdlcrx.len < 4) | |
149 | return; | |
150 | if (!check_crc_ccitt(s->hdlcrx.buffer, s->hdlcrx.len)) | |
151 | return; | |
152 | pkt_len = s->hdlcrx.len - 2 + 1; /* KISS kludge */ | |
153 | if (!(skb = dev_alloc_skb(pkt_len))) { | |
154 | printk("%s: memory squeeze, dropping packet\n", dev->name); | |
155 | s->stats.rx_dropped++; | |
156 | return; | |
157 | } | |
1da177e4 LT |
158 | cp = skb_put(skb, pkt_len); |
159 | *cp++ = 0; /* KISS kludge */ | |
160 | memcpy(cp, s->hdlcrx.buffer, pkt_len - 1); | |
56cb5156 | 161 | skb->protocol = ax25_type_trans(skb, dev); |
1da177e4 LT |
162 | netif_rx(skb); |
163 | dev->last_rx = jiffies; | |
164 | s->stats.rx_packets++; | |
165 | } | |
166 | ||
167 | void hdlcdrv_receiver(struct net_device *dev, struct hdlcdrv_state *s) | |
168 | { | |
169 | int i; | |
170 | unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word; | |
171 | ||
172 | if (!s || s->magic != HDLCDRV_MAGIC) | |
173 | return; | |
174 | if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx)) | |
175 | return; | |
176 | ||
177 | while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) { | |
178 | word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf); | |
179 | ||
180 | #ifdef HDLCDRV_DEBUG | |
181 | hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word); | |
182 | #endif /* HDLCDRV_DEBUG */ | |
183 | s->hdlcrx.bitstream >>= 16; | |
184 | s->hdlcrx.bitstream |= word << 16; | |
185 | s->hdlcrx.bitbuf >>= 16; | |
186 | s->hdlcrx.bitbuf |= word << 16; | |
187 | s->hdlcrx.numbits += 16; | |
188 | for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00, | |
189 | mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff; | |
190 | i >= 0; | |
191 | i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1, | |
192 | mask5 <<= 1, mask6 = (mask6 << 1) | 1) { | |
193 | if ((s->hdlcrx.bitstream & mask1) == mask1) | |
194 | s->hdlcrx.rx_state = 0; /* abort received */ | |
195 | else if ((s->hdlcrx.bitstream & mask2) == mask3) { | |
196 | /* flag received */ | |
197 | if (s->hdlcrx.rx_state) { | |
198 | hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf | |
199 | << (8+i), | |
200 | s->hdlcrx.numbits | |
201 | -8-i); | |
202 | hdlc_rx_flag(dev, s); | |
203 | } | |
204 | s->hdlcrx.len = 0; | |
205 | s->hdlcrx.bp = s->hdlcrx.buffer; | |
206 | s->hdlcrx.rx_state = 1; | |
207 | s->hdlcrx.numbits = i; | |
208 | } else if ((s->hdlcrx.bitstream & mask4) == mask5) { | |
209 | /* stuffed bit */ | |
210 | s->hdlcrx.numbits--; | |
211 | s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) | | |
212 | ((s->hdlcrx.bitbuf & mask6) << 1); | |
213 | } | |
214 | } | |
215 | s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf, | |
216 | s->hdlcrx.numbits); | |
217 | } | |
218 | clear_bit(0, &s->hdlcrx.in_hdlc_rx); | |
219 | } | |
220 | ||
221 | /* ---------------------------------------------------------------------- */ | |
222 | ||
223 | static inline void do_kiss_params(struct hdlcdrv_state *s, | |
224 | unsigned char *data, unsigned long len) | |
225 | { | |
226 | ||
227 | #ifdef KISS_VERBOSE | |
228 | #define PKP(a,b) printk(KERN_INFO "hdlcdrv.c: channel params: " a "\n", b) | |
229 | #else /* KISS_VERBOSE */ | |
230 | #define PKP(a,b) | |
231 | #endif /* KISS_VERBOSE */ | |
232 | ||
233 | if (len < 2) | |
234 | return; | |
235 | switch(data[0]) { | |
236 | case PARAM_TXDELAY: | |
237 | s->ch_params.tx_delay = data[1]; | |
238 | PKP("TX delay = %ums", 10 * s->ch_params.tx_delay); | |
239 | break; | |
240 | case PARAM_PERSIST: | |
241 | s->ch_params.ppersist = data[1]; | |
242 | PKP("p persistence = %u", s->ch_params.ppersist); | |
243 | break; | |
244 | case PARAM_SLOTTIME: | |
245 | s->ch_params.slottime = data[1]; | |
246 | PKP("slot time = %ums", s->ch_params.slottime); | |
247 | break; | |
248 | case PARAM_TXTAIL: | |
249 | s->ch_params.tx_tail = data[1]; | |
250 | PKP("TX tail = %ums", s->ch_params.tx_tail); | |
251 | break; | |
252 | case PARAM_FULLDUP: | |
253 | s->ch_params.fulldup = !!data[1]; | |
254 | PKP("%s duplex", s->ch_params.fulldup ? "full" : "half"); | |
255 | break; | |
256 | default: | |
257 | break; | |
258 | } | |
259 | #undef PKP | |
260 | } | |
261 | ||
262 | /* ---------------------------------------------------------------------- */ | |
263 | ||
264 | void hdlcdrv_transmitter(struct net_device *dev, struct hdlcdrv_state *s) | |
265 | { | |
266 | unsigned int mask1, mask2, mask3; | |
267 | int i; | |
268 | struct sk_buff *skb; | |
269 | int pkt_len; | |
270 | ||
271 | if (!s || s->magic != HDLCDRV_MAGIC) | |
272 | return; | |
273 | if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx)) | |
274 | return; | |
275 | for (;;) { | |
276 | if (s->hdlctx.numbits >= 16) { | |
277 | if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) { | |
278 | clear_bit(0, &s->hdlctx.in_hdlc_tx); | |
279 | return; | |
280 | } | |
281 | hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf); | |
282 | s->hdlctx.bitbuf >>= 16; | |
283 | s->hdlctx.numbits -= 16; | |
284 | } | |
285 | switch (s->hdlctx.tx_state) { | |
286 | default: | |
287 | clear_bit(0, &s->hdlctx.in_hdlc_tx); | |
288 | return; | |
289 | case 0: | |
290 | case 1: | |
291 | if (s->hdlctx.numflags) { | |
292 | s->hdlctx.numflags--; | |
293 | s->hdlctx.bitbuf |= | |
294 | 0x7e7e << s->hdlctx.numbits; | |
295 | s->hdlctx.numbits += 16; | |
296 | break; | |
297 | } | |
298 | if (s->hdlctx.tx_state == 1) { | |
299 | clear_bit(0, &s->hdlctx.in_hdlc_tx); | |
300 | return; | |
301 | } | |
302 | if (!(skb = s->skb)) { | |
303 | int flgs = tenms_to_2flags(s, s->ch_params.tx_tail); | |
304 | if (flgs < 2) | |
305 | flgs = 2; | |
306 | s->hdlctx.tx_state = 1; | |
307 | s->hdlctx.numflags = flgs; | |
308 | break; | |
309 | } | |
310 | s->skb = NULL; | |
311 | netif_wake_queue(dev); | |
312 | pkt_len = skb->len-1; /* strip KISS byte */ | |
313 | if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) { | |
314 | s->hdlctx.tx_state = 0; | |
315 | s->hdlctx.numflags = 1; | |
316 | dev_kfree_skb_irq(skb); | |
317 | break; | |
318 | } | |
319 | memcpy(s->hdlctx.buffer, skb->data+1, pkt_len); | |
320 | dev_kfree_skb_irq(skb); | |
321 | s->hdlctx.bp = s->hdlctx.buffer; | |
322 | append_crc_ccitt(s->hdlctx.buffer, pkt_len); | |
323 | s->hdlctx.len = pkt_len+2; /* the appended CRC */ | |
324 | s->hdlctx.tx_state = 2; | |
325 | s->hdlctx.bitstream = 0; | |
326 | s->stats.tx_packets++; | |
327 | break; | |
328 | case 2: | |
329 | if (!s->hdlctx.len) { | |
330 | s->hdlctx.tx_state = 0; | |
331 | s->hdlctx.numflags = 1; | |
332 | break; | |
333 | } | |
334 | s->hdlctx.len--; | |
335 | s->hdlctx.bitbuf |= *s->hdlctx.bp << | |
336 | s->hdlctx.numbits; | |
337 | s->hdlctx.bitstream >>= 8; | |
338 | s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16; | |
339 | mask1 = 0x1f000; | |
340 | mask2 = 0x10000; | |
341 | mask3 = 0xffffffff >> (31-s->hdlctx.numbits); | |
342 | s->hdlctx.numbits += 8; | |
343 | for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1, | |
344 | mask3 = (mask3 << 1) | 1) { | |
345 | if ((s->hdlctx.bitstream & mask1) != mask1) | |
346 | continue; | |
347 | s->hdlctx.bitstream &= ~mask2; | |
348 | s->hdlctx.bitbuf = | |
349 | (s->hdlctx.bitbuf & mask3) | | |
350 | ((s->hdlctx.bitbuf & | |
351 | (~mask3)) << 1); | |
352 | s->hdlctx.numbits++; | |
353 | mask3 = (mask3 << 1) | 1; | |
354 | } | |
355 | break; | |
356 | } | |
357 | } | |
358 | } | |
359 | ||
360 | /* ---------------------------------------------------------------------- */ | |
361 | ||
362 | static void start_tx(struct net_device *dev, struct hdlcdrv_state *s) | |
363 | { | |
364 | s->hdlctx.tx_state = 0; | |
365 | s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay); | |
366 | s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0; | |
367 | hdlcdrv_transmitter(dev, s); | |
368 | s->hdlctx.ptt = 1; | |
369 | s->ptt_keyed++; | |
370 | } | |
371 | ||
372 | /* ---------------------------------------------------------------------- */ | |
373 | ||
374 | static unsigned short random_seed; | |
375 | ||
376 | static inline unsigned short random_num(void) | |
377 | { | |
378 | random_seed = 28629 * random_seed + 157; | |
379 | return random_seed; | |
380 | } | |
381 | ||
382 | /* ---------------------------------------------------------------------- */ | |
383 | ||
384 | void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s) | |
385 | { | |
386 | if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb) | |
387 | return; | |
388 | if (s->ch_params.fulldup) { | |
389 | start_tx(dev, s); | |
390 | return; | |
391 | } | |
392 | if (s->hdlcrx.dcd) { | |
393 | s->hdlctx.slotcnt = s->ch_params.slottime; | |
394 | return; | |
395 | } | |
396 | if ((--s->hdlctx.slotcnt) > 0) | |
397 | return; | |
398 | s->hdlctx.slotcnt = s->ch_params.slottime; | |
399 | if ((random_num() % 256) > s->ch_params.ppersist) | |
400 | return; | |
401 | start_tx(dev, s); | |
402 | } | |
403 | ||
404 | /* --------------------------------------------------------------------- */ | |
405 | /* | |
406 | * ===================== network driver interface ========================= | |
407 | */ | |
408 | ||
409 | static int hdlcdrv_send_packet(struct sk_buff *skb, struct net_device *dev) | |
410 | { | |
411 | struct hdlcdrv_state *sm = netdev_priv(dev); | |
412 | ||
413 | if (skb->data[0] != 0) { | |
414 | do_kiss_params(sm, skb->data, skb->len); | |
415 | dev_kfree_skb(skb); | |
416 | return 0; | |
417 | } | |
418 | if (sm->skb) | |
419 | return -1; | |
420 | netif_stop_queue(dev); | |
421 | sm->skb = skb; | |
422 | return 0; | |
423 | } | |
424 | ||
425 | /* --------------------------------------------------------------------- */ | |
426 | ||
427 | static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr) | |
428 | { | |
429 | struct sockaddr *sa = (struct sockaddr *)addr; | |
430 | ||
431 | /* addr is an AX.25 shifted ASCII mac address */ | |
432 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
433 | return 0; | |
434 | } | |
435 | ||
436 | /* --------------------------------------------------------------------- */ | |
437 | ||
438 | static struct net_device_stats *hdlcdrv_get_stats(struct net_device *dev) | |
439 | { | |
440 | struct hdlcdrv_state *sm = netdev_priv(dev); | |
441 | ||
442 | /* | |
443 | * Get the current statistics. This may be called with the | |
444 | * card open or closed. | |
445 | */ | |
446 | return &sm->stats; | |
447 | } | |
448 | ||
449 | /* --------------------------------------------------------------------- */ | |
450 | /* | |
451 | * Open/initialize the board. This is called (in the current kernel) | |
452 | * sometime after booting when the 'ifconfig' program is run. | |
453 | * | |
454 | * This routine should set everything up anew at each open, even | |
455 | * registers that "should" only need to be set once at boot, so that | |
456 | * there is non-reboot way to recover if something goes wrong. | |
457 | */ | |
458 | ||
459 | static int hdlcdrv_open(struct net_device *dev) | |
460 | { | |
461 | struct hdlcdrv_state *s = netdev_priv(dev); | |
462 | int i; | |
463 | ||
464 | if (!s->ops || !s->ops->open) | |
465 | return -ENODEV; | |
466 | ||
467 | /* | |
468 | * initialise some variables | |
469 | */ | |
470 | s->opened = 1; | |
471 | s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0; | |
472 | s->hdlcrx.in_hdlc_rx = 0; | |
473 | s->hdlcrx.rx_state = 0; | |
474 | ||
475 | s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0; | |
476 | s->hdlctx.in_hdlc_tx = 0; | |
477 | s->hdlctx.tx_state = 1; | |
478 | s->hdlctx.numflags = 0; | |
479 | s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0; | |
480 | s->hdlctx.ptt = 0; | |
481 | s->hdlctx.slotcnt = s->ch_params.slottime; | |
482 | s->hdlctx.calibrate = 0; | |
483 | ||
484 | i = s->ops->open(dev); | |
485 | if (i) | |
486 | return i; | |
487 | netif_start_queue(dev); | |
488 | return 0; | |
489 | } | |
490 | ||
491 | /* --------------------------------------------------------------------- */ | |
492 | /* | |
493 | * The inverse routine to hdlcdrv_open(). | |
494 | */ | |
495 | ||
496 | static int hdlcdrv_close(struct net_device *dev) | |
497 | { | |
498 | struct hdlcdrv_state *s = netdev_priv(dev); | |
499 | int i = 0; | |
500 | ||
501 | netif_stop_queue(dev); | |
502 | ||
503 | if (s->ops && s->ops->close) | |
504 | i = s->ops->close(dev); | |
505 | if (s->skb) | |
506 | dev_kfree_skb(s->skb); | |
507 | s->skb = NULL; | |
508 | s->opened = 0; | |
509 | return i; | |
510 | } | |
511 | ||
512 | /* --------------------------------------------------------------------- */ | |
513 | ||
514 | static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
515 | { | |
516 | struct hdlcdrv_state *s = netdev_priv(dev); | |
517 | struct hdlcdrv_ioctl bi; | |
518 | ||
519 | if (cmd != SIOCDEVPRIVATE) { | |
520 | if (s->ops && s->ops->ioctl) | |
521 | return s->ops->ioctl(dev, ifr, &bi, cmd); | |
522 | return -ENOIOCTLCMD; | |
523 | } | |
524 | if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi))) | |
525 | return -EFAULT; | |
526 | ||
527 | switch (bi.cmd) { | |
528 | default: | |
529 | if (s->ops && s->ops->ioctl) | |
530 | return s->ops->ioctl(dev, ifr, &bi, cmd); | |
531 | return -ENOIOCTLCMD; | |
532 | ||
533 | case HDLCDRVCTL_GETCHANNELPAR: | |
534 | bi.data.cp.tx_delay = s->ch_params.tx_delay; | |
535 | bi.data.cp.tx_tail = s->ch_params.tx_tail; | |
536 | bi.data.cp.slottime = s->ch_params.slottime; | |
537 | bi.data.cp.ppersist = s->ch_params.ppersist; | |
538 | bi.data.cp.fulldup = s->ch_params.fulldup; | |
539 | break; | |
540 | ||
541 | case HDLCDRVCTL_SETCHANNELPAR: | |
542 | if (!capable(CAP_NET_ADMIN)) | |
543 | return -EACCES; | |
544 | s->ch_params.tx_delay = bi.data.cp.tx_delay; | |
545 | s->ch_params.tx_tail = bi.data.cp.tx_tail; | |
546 | s->ch_params.slottime = bi.data.cp.slottime; | |
547 | s->ch_params.ppersist = bi.data.cp.ppersist; | |
548 | s->ch_params.fulldup = bi.data.cp.fulldup; | |
549 | s->hdlctx.slotcnt = 1; | |
550 | return 0; | |
551 | ||
552 | case HDLCDRVCTL_GETMODEMPAR: | |
553 | bi.data.mp.iobase = dev->base_addr; | |
554 | bi.data.mp.irq = dev->irq; | |
555 | bi.data.mp.dma = dev->dma; | |
556 | bi.data.mp.dma2 = s->ptt_out.dma2; | |
557 | bi.data.mp.seriobase = s->ptt_out.seriobase; | |
558 | bi.data.mp.pariobase = s->ptt_out.pariobase; | |
559 | bi.data.mp.midiiobase = s->ptt_out.midiiobase; | |
560 | break; | |
561 | ||
562 | case HDLCDRVCTL_SETMODEMPAR: | |
563 | if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev)) | |
564 | return -EACCES; | |
565 | dev->base_addr = bi.data.mp.iobase; | |
566 | dev->irq = bi.data.mp.irq; | |
567 | dev->dma = bi.data.mp.dma; | |
568 | s->ptt_out.dma2 = bi.data.mp.dma2; | |
569 | s->ptt_out.seriobase = bi.data.mp.seriobase; | |
570 | s->ptt_out.pariobase = bi.data.mp.pariobase; | |
571 | s->ptt_out.midiiobase = bi.data.mp.midiiobase; | |
572 | return 0; | |
573 | ||
574 | case HDLCDRVCTL_GETSTAT: | |
575 | bi.data.cs.ptt = hdlcdrv_ptt(s); | |
576 | bi.data.cs.dcd = s->hdlcrx.dcd; | |
577 | bi.data.cs.ptt_keyed = s->ptt_keyed; | |
578 | bi.data.cs.tx_packets = s->stats.tx_packets; | |
579 | bi.data.cs.tx_errors = s->stats.tx_errors; | |
580 | bi.data.cs.rx_packets = s->stats.rx_packets; | |
581 | bi.data.cs.rx_errors = s->stats.rx_errors; | |
582 | break; | |
583 | ||
584 | case HDLCDRVCTL_OLDGETSTAT: | |
585 | bi.data.ocs.ptt = hdlcdrv_ptt(s); | |
586 | bi.data.ocs.dcd = s->hdlcrx.dcd; | |
587 | bi.data.ocs.ptt_keyed = s->ptt_keyed; | |
588 | break; | |
589 | ||
590 | case HDLCDRVCTL_CALIBRATE: | |
591 | if(!capable(CAP_SYS_RAWIO)) | |
592 | return -EPERM; | |
593 | s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16; | |
594 | return 0; | |
595 | ||
596 | case HDLCDRVCTL_GETSAMPLES: | |
597 | #ifndef HDLCDRV_DEBUG | |
598 | return -EPERM; | |
599 | #else /* HDLCDRV_DEBUG */ | |
600 | if (s->bitbuf_channel.rd == s->bitbuf_channel.wr) | |
601 | return -EAGAIN; | |
602 | bi.data.bits = | |
603 | s->bitbuf_channel.buffer[s->bitbuf_channel.rd]; | |
604 | s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) % | |
605 | sizeof(s->bitbuf_channel.buffer); | |
606 | break; | |
607 | #endif /* HDLCDRV_DEBUG */ | |
608 | ||
609 | case HDLCDRVCTL_GETBITS: | |
610 | #ifndef HDLCDRV_DEBUG | |
611 | return -EPERM; | |
612 | #else /* HDLCDRV_DEBUG */ | |
613 | if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr) | |
614 | return -EAGAIN; | |
615 | bi.data.bits = | |
616 | s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd]; | |
617 | s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) % | |
618 | sizeof(s->bitbuf_hdlc.buffer); | |
619 | break; | |
620 | #endif /* HDLCDRV_DEBUG */ | |
621 | ||
622 | case HDLCDRVCTL_DRIVERNAME: | |
623 | if (s->ops && s->ops->drvname) { | |
624 | strncpy(bi.data.drivername, s->ops->drvname, | |
625 | sizeof(bi.data.drivername)); | |
626 | break; | |
627 | } | |
628 | bi.data.drivername[0] = '\0'; | |
629 | break; | |
630 | ||
631 | } | |
632 | if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi))) | |
633 | return -EFAULT; | |
634 | return 0; | |
635 | ||
636 | } | |
637 | ||
638 | /* --------------------------------------------------------------------- */ | |
639 | ||
640 | /* | |
641 | * Initialize fields in hdlcdrv | |
642 | */ | |
643 | static void hdlcdrv_setup(struct net_device *dev) | |
644 | { | |
645 | static const struct hdlcdrv_channel_params dflt_ch_params = { | |
646 | 20, 2, 10, 40, 0 | |
647 | }; | |
648 | struct hdlcdrv_state *s = netdev_priv(dev); | |
649 | ||
650 | /* | |
651 | * initialize the hdlcdrv_state struct | |
652 | */ | |
653 | s->ch_params = dflt_ch_params; | |
654 | s->ptt_keyed = 0; | |
655 | ||
656 | spin_lock_init(&s->hdlcrx.hbuf.lock); | |
657 | s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0; | |
658 | s->hdlcrx.in_hdlc_rx = 0; | |
659 | s->hdlcrx.rx_state = 0; | |
660 | ||
661 | spin_lock_init(&s->hdlctx.hbuf.lock); | |
662 | s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0; | |
663 | s->hdlctx.in_hdlc_tx = 0; | |
664 | s->hdlctx.tx_state = 1; | |
665 | s->hdlctx.numflags = 0; | |
666 | s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0; | |
667 | s->hdlctx.ptt = 0; | |
668 | s->hdlctx.slotcnt = s->ch_params.slottime; | |
669 | s->hdlctx.calibrate = 0; | |
670 | ||
671 | #ifdef HDLCDRV_DEBUG | |
672 | s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0; | |
673 | s->bitbuf_channel.shreg = 0x80; | |
674 | ||
675 | s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0; | |
676 | s->bitbuf_hdlc.shreg = 0x80; | |
677 | #endif /* HDLCDRV_DEBUG */ | |
678 | ||
679 | /* | |
680 | * initialize the device struct | |
681 | */ | |
682 | dev->open = hdlcdrv_open; | |
683 | dev->stop = hdlcdrv_close; | |
684 | dev->do_ioctl = hdlcdrv_ioctl; | |
685 | dev->hard_start_xmit = hdlcdrv_send_packet; | |
686 | dev->get_stats = hdlcdrv_get_stats; | |
687 | ||
688 | /* Fill in the fields of the device structure */ | |
689 | ||
690 | s->skb = NULL; | |
691 | ||
6f74998e | 692 | dev->hard_header = ax25_hard_header; |
1da177e4 | 693 | dev->rebuild_header = ax25_rebuild_header; |
1da177e4 LT |
694 | dev->set_mac_address = hdlcdrv_set_mac_address; |
695 | ||
696 | dev->type = ARPHRD_AX25; /* AF_AX25 device */ | |
697 | dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN; | |
698 | dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */ | |
699 | dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */ | |
15b1c0e8 RB |
700 | memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN); |
701 | memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN); | |
1da177e4 LT |
702 | dev->tx_queue_len = 16; |
703 | } | |
704 | ||
705 | /* --------------------------------------------------------------------- */ | |
706 | struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops, | |
707 | unsigned int privsize, const char *ifname, | |
708 | unsigned int baseaddr, unsigned int irq, | |
709 | unsigned int dma) | |
710 | { | |
711 | struct net_device *dev; | |
712 | struct hdlcdrv_state *s; | |
713 | int err; | |
714 | ||
715 | BUG_ON(ops == NULL); | |
716 | ||
717 | if (privsize < sizeof(struct hdlcdrv_state)) | |
718 | privsize = sizeof(struct hdlcdrv_state); | |
719 | ||
720 | dev = alloc_netdev(privsize, ifname, hdlcdrv_setup); | |
721 | if (!dev) | |
722 | return ERR_PTR(-ENOMEM); | |
723 | ||
724 | /* | |
725 | * initialize part of the hdlcdrv_state struct | |
726 | */ | |
727 | s = netdev_priv(dev); | |
728 | s->magic = HDLCDRV_MAGIC; | |
729 | s->ops = ops; | |
730 | dev->base_addr = baseaddr; | |
731 | dev->irq = irq; | |
732 | dev->dma = dma; | |
733 | ||
734 | err = register_netdev(dev); | |
735 | if (err < 0) { | |
736 | printk(KERN_WARNING "hdlcdrv: cannot register net " | |
737 | "device %s\n", dev->name); | |
738 | free_netdev(dev); | |
739 | dev = ERR_PTR(err); | |
740 | } | |
741 | return dev; | |
742 | } | |
743 | ||
744 | /* --------------------------------------------------------------------- */ | |
745 | ||
746 | void hdlcdrv_unregister(struct net_device *dev) | |
747 | { | |
748 | struct hdlcdrv_state *s = netdev_priv(dev); | |
749 | ||
750 | BUG_ON(s->magic != HDLCDRV_MAGIC); | |
751 | ||
752 | if (s->opened && s->ops->close) | |
753 | s->ops->close(dev); | |
754 | unregister_netdev(dev); | |
755 | ||
756 | free_netdev(dev); | |
757 | } | |
758 | ||
759 | /* --------------------------------------------------------------------- */ | |
760 | ||
761 | EXPORT_SYMBOL(hdlcdrv_receiver); | |
762 | EXPORT_SYMBOL(hdlcdrv_transmitter); | |
763 | EXPORT_SYMBOL(hdlcdrv_arbitrate); | |
764 | EXPORT_SYMBOL(hdlcdrv_register); | |
765 | EXPORT_SYMBOL(hdlcdrv_unregister); | |
766 | ||
767 | /* --------------------------------------------------------------------- */ | |
768 | ||
769 | static int __init hdlcdrv_init_driver(void) | |
770 | { | |
771 | printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n"); | |
772 | printk(KERN_INFO "hdlcdrv: version 0.8 compiled " __TIME__ " " __DATE__ "\n"); | |
773 | return 0; | |
774 | } | |
775 | ||
776 | /* --------------------------------------------------------------------- */ | |
777 | ||
778 | static void __exit hdlcdrv_cleanup_driver(void) | |
779 | { | |
780 | printk(KERN_INFO "hdlcdrv: cleanup\n"); | |
781 | } | |
782 | ||
783 | /* --------------------------------------------------------------------- */ | |
784 | ||
785 | MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu"); | |
786 | MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder"); | |
787 | MODULE_LICENSE("GPL"); | |
788 | module_init(hdlcdrv_init_driver); | |
789 | module_exit(hdlcdrv_cleanup_driver); | |
790 | ||
791 | /* --------------------------------------------------------------------- */ |