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3f5296f0 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /*****************************************************************************/ |
3 | ||
4 | /* | |
5 | * hdlcdrv.c -- HDLC packet radio network driver. | |
6 | * | |
7 | * Copyright (C) 1996-2000 Thomas Sailer (sailer@ife.ee.ethz.ch) | |
8 | * | |
1da177e4 LT |
9 | * Please note that the GPL allows you to use the driver, NOT the radio. |
10 | * In order to use the radio, you need a license from the communications | |
11 | * authority of your country. | |
12 | * | |
13 | * The driver was derived from Donald Beckers skeleton.c | |
14 | * Written 1993-94 by Donald Becker. | |
15 | * | |
16 | * History: | |
17 | * 0.1 21.09.1996 Started | |
18 | * 18.10.1996 Changed to new user space access routines | |
19 | * (copy_{to,from}_user) | |
20 | * 0.2 21.11.1996 various small changes | |
21 | * 0.3 03.03.1997 fixed (hopefully) IP not working with ax.25 as a module | |
22 | * 0.4 16.04.1997 init code/data tagged | |
23 | * 0.5 30.07.1997 made HDLC buffers bigger (solves a problem with the | |
24 | * soundmodem driver) | |
25 | * 0.6 05.04.1998 add spinlocks | |
26 | * 0.7 03.08.1999 removed some old compatibility cruft | |
27 | * 0.8 12.02.2000 adapted to softnet driver interface | |
28 | */ | |
29 | ||
30 | /*****************************************************************************/ | |
31 | ||
d43c36dc | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/module.h> |
34 | #include <linux/types.h> | |
35 | #include <linux/net.h> | |
36 | #include <linux/in.h> | |
37 | #include <linux/if.h> | |
1da177e4 LT |
38 | #include <linux/errno.h> |
39 | #include <linux/init.h> | |
40 | #include <linux/bitops.h> | |
1da177e4 LT |
41 | |
42 | #include <linux/netdevice.h> | |
43 | #include <linux/if_arp.h> | |
1da177e4 LT |
44 | #include <linux/skbuff.h> |
45 | #include <linux/hdlcdrv.h> | |
8b5b4671 | 46 | #include <linux/random.h> |
1da177e4 | 47 | #include <net/ax25.h> |
7c0f6ba6 | 48 | #include <linux/uaccess.h> |
1da177e4 | 49 | |
1da177e4 LT |
50 | #include <linux/crc-ccitt.h> |
51 | ||
52 | /* --------------------------------------------------------------------- */ | |
53 | ||
1da177e4 LT |
54 | #define KISS_VERBOSE |
55 | ||
56 | /* --------------------------------------------------------------------- */ | |
57 | ||
58 | #define PARAM_TXDELAY 1 | |
59 | #define PARAM_PERSIST 2 | |
60 | #define PARAM_SLOTTIME 3 | |
61 | #define PARAM_TXTAIL 4 | |
62 | #define PARAM_FULLDUP 5 | |
63 | #define PARAM_HARDWARE 6 | |
64 | #define PARAM_RETURN 255 | |
65 | ||
66 | /* --------------------------------------------------------------------- */ | |
67 | /* | |
68 | * the CRC routines are stolen from WAMPES | |
69 | * by Dieter Deyke | |
70 | */ | |
71 | ||
72 | ||
73 | /*---------------------------------------------------------------------------*/ | |
74 | ||
75 | static inline void append_crc_ccitt(unsigned char *buffer, int len) | |
76 | { | |
d1542f85 | 77 | unsigned int crc = crc_ccitt(0xffff, buffer, len) ^ 0xffff; |
ae6134bd | 78 | buffer += len; |
1da177e4 LT |
79 | *buffer++ = crc; |
80 | *buffer++ = crc >> 8; | |
81 | } | |
82 | ||
83 | /*---------------------------------------------------------------------------*/ | |
84 | ||
85 | static inline int check_crc_ccitt(const unsigned char *buf, int cnt) | |
86 | { | |
87 | return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8; | |
88 | } | |
89 | ||
90 | /*---------------------------------------------------------------------------*/ | |
91 | ||
92 | #if 0 | |
93 | static int calc_crc_ccitt(const unsigned char *buf, int cnt) | |
94 | { | |
95 | unsigned int crc = 0xffff; | |
96 | ||
97 | for (; cnt > 0; cnt--) | |
98 | crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buf++) & 0xff]; | |
99 | crc ^= 0xffff; | |
807540ba | 100 | return crc & 0xffff; |
1da177e4 LT |
101 | } |
102 | #endif | |
103 | ||
104 | /* ---------------------------------------------------------------------- */ | |
105 | ||
106 | #define tenms_to_2flags(s,tenms) ((tenms * s->par.bitrate) / 100 / 16) | |
107 | ||
108 | /* ---------------------------------------------------------------------- */ | |
109 | /* | |
110 | * The HDLC routines | |
111 | */ | |
112 | ||
113 | static int hdlc_rx_add_bytes(struct hdlcdrv_state *s, unsigned int bits, | |
114 | int num) | |
115 | { | |
116 | int added = 0; | |
117 | ||
118 | while (s->hdlcrx.rx_state && num >= 8) { | |
119 | if (s->hdlcrx.len >= sizeof(s->hdlcrx.buffer)) { | |
120 | s->hdlcrx.rx_state = 0; | |
121 | return 0; | |
122 | } | |
123 | *s->hdlcrx.bp++ = bits >> (32-num); | |
124 | s->hdlcrx.len++; | |
125 | num -= 8; | |
126 | added += 8; | |
127 | } | |
128 | return added; | |
129 | } | |
130 | ||
131 | static void hdlc_rx_flag(struct net_device *dev, struct hdlcdrv_state *s) | |
132 | { | |
133 | struct sk_buff *skb; | |
134 | int pkt_len; | |
135 | unsigned char *cp; | |
136 | ||
137 | if (s->hdlcrx.len < 4) | |
138 | return; | |
139 | if (!check_crc_ccitt(s->hdlcrx.buffer, s->hdlcrx.len)) | |
140 | return; | |
141 | pkt_len = s->hdlcrx.len - 2 + 1; /* KISS kludge */ | |
142 | if (!(skb = dev_alloc_skb(pkt_len))) { | |
143 | printk("%s: memory squeeze, dropping packet\n", dev->name); | |
5a7616af | 144 | dev->stats.rx_dropped++; |
1da177e4 LT |
145 | return; |
146 | } | |
1da177e4 LT |
147 | cp = skb_put(skb, pkt_len); |
148 | *cp++ = 0; /* KISS kludge */ | |
149 | memcpy(cp, s->hdlcrx.buffer, pkt_len - 1); | |
56cb5156 | 150 | skb->protocol = ax25_type_trans(skb, dev); |
1da177e4 | 151 | netif_rx(skb); |
5a7616af | 152 | dev->stats.rx_packets++; |
1da177e4 LT |
153 | } |
154 | ||
155 | void hdlcdrv_receiver(struct net_device *dev, struct hdlcdrv_state *s) | |
156 | { | |
157 | int i; | |
158 | unsigned int mask1, mask2, mask3, mask4, mask5, mask6, word; | |
159 | ||
160 | if (!s || s->magic != HDLCDRV_MAGIC) | |
161 | return; | |
162 | if (test_and_set_bit(0, &s->hdlcrx.in_hdlc_rx)) | |
163 | return; | |
164 | ||
165 | while (!hdlcdrv_hbuf_empty(&s->hdlcrx.hbuf)) { | |
166 | word = hdlcdrv_hbuf_get(&s->hdlcrx.hbuf); | |
167 | ||
168 | #ifdef HDLCDRV_DEBUG | |
169 | hdlcdrv_add_bitbuffer_word(&s->bitbuf_hdlc, word); | |
170 | #endif /* HDLCDRV_DEBUG */ | |
171 | s->hdlcrx.bitstream >>= 16; | |
172 | s->hdlcrx.bitstream |= word << 16; | |
173 | s->hdlcrx.bitbuf >>= 16; | |
174 | s->hdlcrx.bitbuf |= word << 16; | |
175 | s->hdlcrx.numbits += 16; | |
176 | for(i = 15, mask1 = 0x1fc00, mask2 = 0x1fe00, mask3 = 0x0fc00, | |
177 | mask4 = 0x1f800, mask5 = 0xf800, mask6 = 0xffff; | |
178 | i >= 0; | |
179 | i--, mask1 <<= 1, mask2 <<= 1, mask3 <<= 1, mask4 <<= 1, | |
180 | mask5 <<= 1, mask6 = (mask6 << 1) | 1) { | |
181 | if ((s->hdlcrx.bitstream & mask1) == mask1) | |
182 | s->hdlcrx.rx_state = 0; /* abort received */ | |
183 | else if ((s->hdlcrx.bitstream & mask2) == mask3) { | |
184 | /* flag received */ | |
185 | if (s->hdlcrx.rx_state) { | |
186 | hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf | |
187 | << (8+i), | |
188 | s->hdlcrx.numbits | |
189 | -8-i); | |
190 | hdlc_rx_flag(dev, s); | |
191 | } | |
192 | s->hdlcrx.len = 0; | |
193 | s->hdlcrx.bp = s->hdlcrx.buffer; | |
194 | s->hdlcrx.rx_state = 1; | |
195 | s->hdlcrx.numbits = i; | |
196 | } else if ((s->hdlcrx.bitstream & mask4) == mask5) { | |
197 | /* stuffed bit */ | |
198 | s->hdlcrx.numbits--; | |
199 | s->hdlcrx.bitbuf = (s->hdlcrx.bitbuf & (~mask6)) | | |
200 | ((s->hdlcrx.bitbuf & mask6) << 1); | |
201 | } | |
202 | } | |
203 | s->hdlcrx.numbits -= hdlc_rx_add_bytes(s, s->hdlcrx.bitbuf, | |
204 | s->hdlcrx.numbits); | |
205 | } | |
206 | clear_bit(0, &s->hdlcrx.in_hdlc_rx); | |
207 | } | |
208 | ||
209 | /* ---------------------------------------------------------------------- */ | |
210 | ||
211 | static inline void do_kiss_params(struct hdlcdrv_state *s, | |
212 | unsigned char *data, unsigned long len) | |
213 | { | |
214 | ||
215 | #ifdef KISS_VERBOSE | |
216 | #define PKP(a,b) printk(KERN_INFO "hdlcdrv.c: channel params: " a "\n", b) | |
217 | #else /* KISS_VERBOSE */ | |
218 | #define PKP(a,b) | |
219 | #endif /* KISS_VERBOSE */ | |
220 | ||
221 | if (len < 2) | |
222 | return; | |
223 | switch(data[0]) { | |
224 | case PARAM_TXDELAY: | |
225 | s->ch_params.tx_delay = data[1]; | |
226 | PKP("TX delay = %ums", 10 * s->ch_params.tx_delay); | |
227 | break; | |
228 | case PARAM_PERSIST: | |
229 | s->ch_params.ppersist = data[1]; | |
230 | PKP("p persistence = %u", s->ch_params.ppersist); | |
231 | break; | |
232 | case PARAM_SLOTTIME: | |
233 | s->ch_params.slottime = data[1]; | |
234 | PKP("slot time = %ums", s->ch_params.slottime); | |
235 | break; | |
236 | case PARAM_TXTAIL: | |
237 | s->ch_params.tx_tail = data[1]; | |
238 | PKP("TX tail = %ums", s->ch_params.tx_tail); | |
239 | break; | |
240 | case PARAM_FULLDUP: | |
241 | s->ch_params.fulldup = !!data[1]; | |
242 | PKP("%s duplex", s->ch_params.fulldup ? "full" : "half"); | |
243 | break; | |
244 | default: | |
245 | break; | |
246 | } | |
247 | #undef PKP | |
248 | } | |
249 | ||
250 | /* ---------------------------------------------------------------------- */ | |
251 | ||
252 | void hdlcdrv_transmitter(struct net_device *dev, struct hdlcdrv_state *s) | |
253 | { | |
254 | unsigned int mask1, mask2, mask3; | |
255 | int i; | |
256 | struct sk_buff *skb; | |
257 | int pkt_len; | |
258 | ||
259 | if (!s || s->magic != HDLCDRV_MAGIC) | |
260 | return; | |
261 | if (test_and_set_bit(0, &s->hdlctx.in_hdlc_tx)) | |
262 | return; | |
263 | for (;;) { | |
264 | if (s->hdlctx.numbits >= 16) { | |
265 | if (hdlcdrv_hbuf_full(&s->hdlctx.hbuf)) { | |
266 | clear_bit(0, &s->hdlctx.in_hdlc_tx); | |
267 | return; | |
268 | } | |
269 | hdlcdrv_hbuf_put(&s->hdlctx.hbuf, s->hdlctx.bitbuf); | |
270 | s->hdlctx.bitbuf >>= 16; | |
271 | s->hdlctx.numbits -= 16; | |
272 | } | |
273 | switch (s->hdlctx.tx_state) { | |
274 | default: | |
275 | clear_bit(0, &s->hdlctx.in_hdlc_tx); | |
276 | return; | |
277 | case 0: | |
278 | case 1: | |
279 | if (s->hdlctx.numflags) { | |
280 | s->hdlctx.numflags--; | |
281 | s->hdlctx.bitbuf |= | |
282 | 0x7e7e << s->hdlctx.numbits; | |
283 | s->hdlctx.numbits += 16; | |
284 | break; | |
285 | } | |
286 | if (s->hdlctx.tx_state == 1) { | |
287 | clear_bit(0, &s->hdlctx.in_hdlc_tx); | |
288 | return; | |
289 | } | |
290 | if (!(skb = s->skb)) { | |
291 | int flgs = tenms_to_2flags(s, s->ch_params.tx_tail); | |
292 | if (flgs < 2) | |
293 | flgs = 2; | |
294 | s->hdlctx.tx_state = 1; | |
295 | s->hdlctx.numflags = flgs; | |
296 | break; | |
297 | } | |
298 | s->skb = NULL; | |
299 | netif_wake_queue(dev); | |
300 | pkt_len = skb->len-1; /* strip KISS byte */ | |
301 | if (pkt_len >= HDLCDRV_MAXFLEN || pkt_len < 2) { | |
302 | s->hdlctx.tx_state = 0; | |
303 | s->hdlctx.numflags = 1; | |
304 | dev_kfree_skb_irq(skb); | |
305 | break; | |
306 | } | |
d626f62b ACM |
307 | skb_copy_from_linear_data_offset(skb, 1, |
308 | s->hdlctx.buffer, | |
309 | pkt_len); | |
1da177e4 LT |
310 | dev_kfree_skb_irq(skb); |
311 | s->hdlctx.bp = s->hdlctx.buffer; | |
312 | append_crc_ccitt(s->hdlctx.buffer, pkt_len); | |
313 | s->hdlctx.len = pkt_len+2; /* the appended CRC */ | |
314 | s->hdlctx.tx_state = 2; | |
315 | s->hdlctx.bitstream = 0; | |
5a7616af | 316 | dev->stats.tx_packets++; |
1da177e4 LT |
317 | break; |
318 | case 2: | |
319 | if (!s->hdlctx.len) { | |
320 | s->hdlctx.tx_state = 0; | |
321 | s->hdlctx.numflags = 1; | |
322 | break; | |
323 | } | |
324 | s->hdlctx.len--; | |
325 | s->hdlctx.bitbuf |= *s->hdlctx.bp << | |
326 | s->hdlctx.numbits; | |
327 | s->hdlctx.bitstream >>= 8; | |
328 | s->hdlctx.bitstream |= (*s->hdlctx.bp++) << 16; | |
329 | mask1 = 0x1f000; | |
330 | mask2 = 0x10000; | |
331 | mask3 = 0xffffffff >> (31-s->hdlctx.numbits); | |
332 | s->hdlctx.numbits += 8; | |
333 | for(i = 0; i < 8; i++, mask1 <<= 1, mask2 <<= 1, | |
334 | mask3 = (mask3 << 1) | 1) { | |
335 | if ((s->hdlctx.bitstream & mask1) != mask1) | |
336 | continue; | |
337 | s->hdlctx.bitstream &= ~mask2; | |
338 | s->hdlctx.bitbuf = | |
339 | (s->hdlctx.bitbuf & mask3) | | |
340 | ((s->hdlctx.bitbuf & | |
341 | (~mask3)) << 1); | |
342 | s->hdlctx.numbits++; | |
343 | mask3 = (mask3 << 1) | 1; | |
344 | } | |
345 | break; | |
346 | } | |
347 | } | |
348 | } | |
349 | ||
350 | /* ---------------------------------------------------------------------- */ | |
351 | ||
352 | static void start_tx(struct net_device *dev, struct hdlcdrv_state *s) | |
353 | { | |
354 | s->hdlctx.tx_state = 0; | |
355 | s->hdlctx.numflags = tenms_to_2flags(s, s->ch_params.tx_delay); | |
356 | s->hdlctx.bitbuf = s->hdlctx.bitstream = s->hdlctx.numbits = 0; | |
357 | hdlcdrv_transmitter(dev, s); | |
358 | s->hdlctx.ptt = 1; | |
359 | s->ptt_keyed++; | |
360 | } | |
361 | ||
362 | /* ---------------------------------------------------------------------- */ | |
363 | ||
1da177e4 LT |
364 | void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s) |
365 | { | |
366 | if (!s || s->magic != HDLCDRV_MAGIC || s->hdlctx.ptt || !s->skb) | |
367 | return; | |
368 | if (s->ch_params.fulldup) { | |
369 | start_tx(dev, s); | |
370 | return; | |
371 | } | |
372 | if (s->hdlcrx.dcd) { | |
373 | s->hdlctx.slotcnt = s->ch_params.slottime; | |
374 | return; | |
375 | } | |
376 | if ((--s->hdlctx.slotcnt) > 0) | |
377 | return; | |
378 | s->hdlctx.slotcnt = s->ch_params.slottime; | |
e00adf39 | 379 | if ((prandom_u32() % 256) > s->ch_params.ppersist) |
1da177e4 LT |
380 | return; |
381 | start_tx(dev, s); | |
382 | } | |
383 | ||
384 | /* --------------------------------------------------------------------- */ | |
385 | /* | |
386 | * ===================== network driver interface ========================= | |
387 | */ | |
388 | ||
36e4d64a SH |
389 | static netdev_tx_t hdlcdrv_send_packet(struct sk_buff *skb, |
390 | struct net_device *dev) | |
1da177e4 LT |
391 | { |
392 | struct hdlcdrv_state *sm = netdev_priv(dev); | |
393 | ||
1d5da757 EB |
394 | if (skb->protocol == htons(ETH_P_IP)) |
395 | return ax25_ip_xmit(skb); | |
396 | ||
1da177e4 LT |
397 | if (skb->data[0] != 0) { |
398 | do_kiss_params(sm, skb->data, skb->len); | |
399 | dev_kfree_skb(skb); | |
6ed10654 | 400 | return NETDEV_TX_OK; |
1da177e4 | 401 | } |
926f2730 FW |
402 | if (sm->skb) { |
403 | dev_kfree_skb(skb); | |
404 | return NETDEV_TX_OK; | |
405 | } | |
1da177e4 LT |
406 | netif_stop_queue(dev); |
407 | sm->skb = skb; | |
6ed10654 | 408 | return NETDEV_TX_OK; |
1da177e4 LT |
409 | } |
410 | ||
411 | /* --------------------------------------------------------------------- */ | |
412 | ||
413 | static int hdlcdrv_set_mac_address(struct net_device *dev, void *addr) | |
414 | { | |
415 | struct sockaddr *sa = (struct sockaddr *)addr; | |
416 | ||
417 | /* addr is an AX.25 shifted ASCII mac address */ | |
418 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
419 | return 0; | |
420 | } | |
421 | ||
1da177e4 LT |
422 | /* --------------------------------------------------------------------- */ |
423 | /* | |
424 | * Open/initialize the board. This is called (in the current kernel) | |
425 | * sometime after booting when the 'ifconfig' program is run. | |
426 | * | |
427 | * This routine should set everything up anew at each open, even | |
428 | * registers that "should" only need to be set once at boot, so that | |
429 | * there is non-reboot way to recover if something goes wrong. | |
430 | */ | |
431 | ||
432 | static int hdlcdrv_open(struct net_device *dev) | |
433 | { | |
434 | struct hdlcdrv_state *s = netdev_priv(dev); | |
435 | int i; | |
436 | ||
437 | if (!s->ops || !s->ops->open) | |
438 | return -ENODEV; | |
439 | ||
440 | /* | |
441 | * initialise some variables | |
442 | */ | |
443 | s->opened = 1; | |
444 | s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0; | |
445 | s->hdlcrx.in_hdlc_rx = 0; | |
446 | s->hdlcrx.rx_state = 0; | |
447 | ||
448 | s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0; | |
449 | s->hdlctx.in_hdlc_tx = 0; | |
450 | s->hdlctx.tx_state = 1; | |
451 | s->hdlctx.numflags = 0; | |
452 | s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0; | |
453 | s->hdlctx.ptt = 0; | |
454 | s->hdlctx.slotcnt = s->ch_params.slottime; | |
455 | s->hdlctx.calibrate = 0; | |
456 | ||
457 | i = s->ops->open(dev); | |
458 | if (i) | |
459 | return i; | |
460 | netif_start_queue(dev); | |
461 | return 0; | |
462 | } | |
463 | ||
464 | /* --------------------------------------------------------------------- */ | |
465 | /* | |
466 | * The inverse routine to hdlcdrv_open(). | |
467 | */ | |
468 | ||
469 | static int hdlcdrv_close(struct net_device *dev) | |
470 | { | |
471 | struct hdlcdrv_state *s = netdev_priv(dev); | |
472 | int i = 0; | |
473 | ||
474 | netif_stop_queue(dev); | |
475 | ||
476 | if (s->ops && s->ops->close) | |
477 | i = s->ops->close(dev); | |
b7deac31 | 478 | dev_kfree_skb(s->skb); |
1da177e4 LT |
479 | s->skb = NULL; |
480 | s->opened = 0; | |
481 | return i; | |
482 | } | |
483 | ||
484 | /* --------------------------------------------------------------------- */ | |
485 | ||
25ec92fb AB |
486 | static int hdlcdrv_siocdevprivate(struct net_device *dev, struct ifreq *ifr, |
487 | void __user *data, int cmd) | |
1da177e4 LT |
488 | { |
489 | struct hdlcdrv_state *s = netdev_priv(dev); | |
490 | struct hdlcdrv_ioctl bi; | |
491 | ||
25ec92fb | 492 | if (cmd != SIOCDEVPRIVATE) |
1da177e4 | 493 | return -ENOIOCTLCMD; |
25ec92fb AB |
494 | |
495 | if (in_compat_syscall()) /* to be implemented */ | |
496 | return -ENOIOCTLCMD; | |
497 | ||
498 | if (copy_from_user(&bi, data, sizeof(bi))) | |
1da177e4 LT |
499 | return -EFAULT; |
500 | ||
501 | switch (bi.cmd) { | |
502 | default: | |
503 | if (s->ops && s->ops->ioctl) | |
25ec92fb | 504 | return s->ops->ioctl(dev, data, &bi, cmd); |
1da177e4 LT |
505 | return -ENOIOCTLCMD; |
506 | ||
507 | case HDLCDRVCTL_GETCHANNELPAR: | |
508 | bi.data.cp.tx_delay = s->ch_params.tx_delay; | |
509 | bi.data.cp.tx_tail = s->ch_params.tx_tail; | |
510 | bi.data.cp.slottime = s->ch_params.slottime; | |
511 | bi.data.cp.ppersist = s->ch_params.ppersist; | |
512 | bi.data.cp.fulldup = s->ch_params.fulldup; | |
513 | break; | |
514 | ||
515 | case HDLCDRVCTL_SETCHANNELPAR: | |
516 | if (!capable(CAP_NET_ADMIN)) | |
517 | return -EACCES; | |
518 | s->ch_params.tx_delay = bi.data.cp.tx_delay; | |
519 | s->ch_params.tx_tail = bi.data.cp.tx_tail; | |
520 | s->ch_params.slottime = bi.data.cp.slottime; | |
521 | s->ch_params.ppersist = bi.data.cp.ppersist; | |
522 | s->ch_params.fulldup = bi.data.cp.fulldup; | |
523 | s->hdlctx.slotcnt = 1; | |
524 | return 0; | |
525 | ||
526 | case HDLCDRVCTL_GETMODEMPAR: | |
527 | bi.data.mp.iobase = dev->base_addr; | |
528 | bi.data.mp.irq = dev->irq; | |
529 | bi.data.mp.dma = dev->dma; | |
530 | bi.data.mp.dma2 = s->ptt_out.dma2; | |
531 | bi.data.mp.seriobase = s->ptt_out.seriobase; | |
532 | bi.data.mp.pariobase = s->ptt_out.pariobase; | |
533 | bi.data.mp.midiiobase = s->ptt_out.midiiobase; | |
534 | break; | |
535 | ||
536 | case HDLCDRVCTL_SETMODEMPAR: | |
537 | if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev)) | |
538 | return -EACCES; | |
539 | dev->base_addr = bi.data.mp.iobase; | |
540 | dev->irq = bi.data.mp.irq; | |
541 | dev->dma = bi.data.mp.dma; | |
542 | s->ptt_out.dma2 = bi.data.mp.dma2; | |
543 | s->ptt_out.seriobase = bi.data.mp.seriobase; | |
544 | s->ptt_out.pariobase = bi.data.mp.pariobase; | |
545 | s->ptt_out.midiiobase = bi.data.mp.midiiobase; | |
546 | return 0; | |
547 | ||
548 | case HDLCDRVCTL_GETSTAT: | |
549 | bi.data.cs.ptt = hdlcdrv_ptt(s); | |
550 | bi.data.cs.dcd = s->hdlcrx.dcd; | |
551 | bi.data.cs.ptt_keyed = s->ptt_keyed; | |
5a7616af SH |
552 | bi.data.cs.tx_packets = dev->stats.tx_packets; |
553 | bi.data.cs.tx_errors = dev->stats.tx_errors; | |
554 | bi.data.cs.rx_packets = dev->stats.rx_packets; | |
555 | bi.data.cs.rx_errors = dev->stats.rx_errors; | |
1da177e4 LT |
556 | break; |
557 | ||
558 | case HDLCDRVCTL_OLDGETSTAT: | |
559 | bi.data.ocs.ptt = hdlcdrv_ptt(s); | |
560 | bi.data.ocs.dcd = s->hdlcrx.dcd; | |
561 | bi.data.ocs.ptt_keyed = s->ptt_keyed; | |
562 | break; | |
563 | ||
564 | case HDLCDRVCTL_CALIBRATE: | |
565 | if(!capable(CAP_SYS_RAWIO)) | |
566 | return -EPERM; | |
fb3ce90b FY |
567 | if (s->par.bitrate <= 0) |
568 | return -EINVAL; | |
e9db5c21 WF |
569 | if (bi.data.calibrate > INT_MAX / s->par.bitrate) |
570 | return -EINVAL; | |
1da177e4 LT |
571 | s->hdlctx.calibrate = bi.data.calibrate * s->par.bitrate / 16; |
572 | return 0; | |
573 | ||
574 | case HDLCDRVCTL_GETSAMPLES: | |
575 | #ifndef HDLCDRV_DEBUG | |
576 | return -EPERM; | |
577 | #else /* HDLCDRV_DEBUG */ | |
578 | if (s->bitbuf_channel.rd == s->bitbuf_channel.wr) | |
579 | return -EAGAIN; | |
580 | bi.data.bits = | |
581 | s->bitbuf_channel.buffer[s->bitbuf_channel.rd]; | |
582 | s->bitbuf_channel.rd = (s->bitbuf_channel.rd+1) % | |
583 | sizeof(s->bitbuf_channel.buffer); | |
584 | break; | |
585 | #endif /* HDLCDRV_DEBUG */ | |
586 | ||
587 | case HDLCDRVCTL_GETBITS: | |
588 | #ifndef HDLCDRV_DEBUG | |
589 | return -EPERM; | |
590 | #else /* HDLCDRV_DEBUG */ | |
591 | if (s->bitbuf_hdlc.rd == s->bitbuf_hdlc.wr) | |
592 | return -EAGAIN; | |
593 | bi.data.bits = | |
594 | s->bitbuf_hdlc.buffer[s->bitbuf_hdlc.rd]; | |
595 | s->bitbuf_hdlc.rd = (s->bitbuf_hdlc.rd+1) % | |
596 | sizeof(s->bitbuf_hdlc.buffer); | |
597 | break; | |
598 | #endif /* HDLCDRV_DEBUG */ | |
599 | ||
600 | case HDLCDRVCTL_DRIVERNAME: | |
601 | if (s->ops && s->ops->drvname) { | |
e03d8a37 | 602 | strlcpy(bi.data.drivername, s->ops->drvname, |
1da177e4 LT |
603 | sizeof(bi.data.drivername)); |
604 | break; | |
605 | } | |
606 | bi.data.drivername[0] = '\0'; | |
607 | break; | |
608 | ||
609 | } | |
25ec92fb | 610 | if (copy_to_user(data, &bi, sizeof(bi))) |
1da177e4 LT |
611 | return -EFAULT; |
612 | return 0; | |
613 | ||
614 | } | |
615 | ||
616 | /* --------------------------------------------------------------------- */ | |
617 | ||
2d8b223d SH |
618 | static const struct net_device_ops hdlcdrv_netdev = { |
619 | .ndo_open = hdlcdrv_open, | |
620 | .ndo_stop = hdlcdrv_close, | |
621 | .ndo_start_xmit = hdlcdrv_send_packet, | |
25ec92fb | 622 | .ndo_siocdevprivate = hdlcdrv_siocdevprivate, |
2d8b223d SH |
623 | .ndo_set_mac_address = hdlcdrv_set_mac_address, |
624 | }; | |
625 | ||
1da177e4 LT |
626 | /* |
627 | * Initialize fields in hdlcdrv | |
628 | */ | |
629 | static void hdlcdrv_setup(struct net_device *dev) | |
630 | { | |
631 | static const struct hdlcdrv_channel_params dflt_ch_params = { | |
632 | 20, 2, 10, 40, 0 | |
633 | }; | |
634 | struct hdlcdrv_state *s = netdev_priv(dev); | |
635 | ||
636 | /* | |
637 | * initialize the hdlcdrv_state struct | |
638 | */ | |
639 | s->ch_params = dflt_ch_params; | |
640 | s->ptt_keyed = 0; | |
641 | ||
642 | spin_lock_init(&s->hdlcrx.hbuf.lock); | |
643 | s->hdlcrx.hbuf.rd = s->hdlcrx.hbuf.wr = 0; | |
644 | s->hdlcrx.in_hdlc_rx = 0; | |
645 | s->hdlcrx.rx_state = 0; | |
646 | ||
647 | spin_lock_init(&s->hdlctx.hbuf.lock); | |
648 | s->hdlctx.hbuf.rd = s->hdlctx.hbuf.wr = 0; | |
649 | s->hdlctx.in_hdlc_tx = 0; | |
650 | s->hdlctx.tx_state = 1; | |
651 | s->hdlctx.numflags = 0; | |
652 | s->hdlctx.bitstream = s->hdlctx.bitbuf = s->hdlctx.numbits = 0; | |
653 | s->hdlctx.ptt = 0; | |
654 | s->hdlctx.slotcnt = s->ch_params.slottime; | |
655 | s->hdlctx.calibrate = 0; | |
656 | ||
657 | #ifdef HDLCDRV_DEBUG | |
658 | s->bitbuf_channel.rd = s->bitbuf_channel.wr = 0; | |
659 | s->bitbuf_channel.shreg = 0x80; | |
660 | ||
661 | s->bitbuf_hdlc.rd = s->bitbuf_hdlc.wr = 0; | |
662 | s->bitbuf_hdlc.shreg = 0x80; | |
663 | #endif /* HDLCDRV_DEBUG */ | |
664 | ||
1da177e4 LT |
665 | |
666 | /* Fill in the fields of the device structure */ | |
667 | ||
668 | s->skb = NULL; | |
669 | ||
2d8b223d | 670 | dev->netdev_ops = &hdlcdrv_netdev; |
3b04ddde | 671 | dev->header_ops = &ax25_header_ops; |
1da177e4 LT |
672 | |
673 | dev->type = ARPHRD_AX25; /* AF_AX25 device */ | |
674 | dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN; | |
675 | dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */ | |
676 | dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */ | |
15b1c0e8 RB |
677 | memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN); |
678 | memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN); | |
1da177e4 LT |
679 | dev->tx_queue_len = 16; |
680 | } | |
681 | ||
682 | /* --------------------------------------------------------------------- */ | |
683 | struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops, | |
684 | unsigned int privsize, const char *ifname, | |
685 | unsigned int baseaddr, unsigned int irq, | |
686 | unsigned int dma) | |
687 | { | |
688 | struct net_device *dev; | |
689 | struct hdlcdrv_state *s; | |
690 | int err; | |
691 | ||
1da177e4 LT |
692 | if (privsize < sizeof(struct hdlcdrv_state)) |
693 | privsize = sizeof(struct hdlcdrv_state); | |
694 | ||
c835a677 | 695 | dev = alloc_netdev(privsize, ifname, NET_NAME_UNKNOWN, hdlcdrv_setup); |
1da177e4 LT |
696 | if (!dev) |
697 | return ERR_PTR(-ENOMEM); | |
698 | ||
699 | /* | |
700 | * initialize part of the hdlcdrv_state struct | |
701 | */ | |
702 | s = netdev_priv(dev); | |
703 | s->magic = HDLCDRV_MAGIC; | |
704 | s->ops = ops; | |
705 | dev->base_addr = baseaddr; | |
706 | dev->irq = irq; | |
707 | dev->dma = dma; | |
708 | ||
709 | err = register_netdev(dev); | |
710 | if (err < 0) { | |
711 | printk(KERN_WARNING "hdlcdrv: cannot register net " | |
712 | "device %s\n", dev->name); | |
713 | free_netdev(dev); | |
714 | dev = ERR_PTR(err); | |
715 | } | |
716 | return dev; | |
717 | } | |
718 | ||
719 | /* --------------------------------------------------------------------- */ | |
720 | ||
721 | void hdlcdrv_unregister(struct net_device *dev) | |
722 | { | |
723 | struct hdlcdrv_state *s = netdev_priv(dev); | |
724 | ||
725 | BUG_ON(s->magic != HDLCDRV_MAGIC); | |
726 | ||
727 | if (s->opened && s->ops->close) | |
728 | s->ops->close(dev); | |
729 | unregister_netdev(dev); | |
730 | ||
731 | free_netdev(dev); | |
732 | } | |
733 | ||
734 | /* --------------------------------------------------------------------- */ | |
735 | ||
736 | EXPORT_SYMBOL(hdlcdrv_receiver); | |
737 | EXPORT_SYMBOL(hdlcdrv_transmitter); | |
738 | EXPORT_SYMBOL(hdlcdrv_arbitrate); | |
739 | EXPORT_SYMBOL(hdlcdrv_register); | |
740 | EXPORT_SYMBOL(hdlcdrv_unregister); | |
741 | ||
742 | /* --------------------------------------------------------------------- */ | |
743 | ||
744 | static int __init hdlcdrv_init_driver(void) | |
745 | { | |
746 | printk(KERN_INFO "hdlcdrv: (C) 1996-2000 Thomas Sailer HB9JNX/AE4WA\n"); | |
b953ff22 | 747 | printk(KERN_INFO "hdlcdrv: version 0.8\n"); |
1da177e4 LT |
748 | return 0; |
749 | } | |
750 | ||
751 | /* --------------------------------------------------------------------- */ | |
752 | ||
753 | static void __exit hdlcdrv_cleanup_driver(void) | |
754 | { | |
755 | printk(KERN_INFO "hdlcdrv: cleanup\n"); | |
756 | } | |
757 | ||
758 | /* --------------------------------------------------------------------- */ | |
759 | ||
760 | MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu"); | |
761 | MODULE_DESCRIPTION("Packet Radio network interface HDLC encoder/decoder"); | |
762 | MODULE_LICENSE("GPL"); | |
763 | module_init(hdlcdrv_init_driver); | |
764 | module_exit(hdlcdrv_cleanup_driver); | |
765 | ||
766 | /* --------------------------------------------------------------------- */ |