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