projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| d43c36dc | 45 | #include <linux/capability.h> |
| 1da177e4 LT |
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> | |
| 1da177e4 LT |
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> | |
| 8b5b4671 | 59 | #include <linux/random.h> |
| 1da177e4 | 60 | #include <net/ax25.h> |
| c4bc7ee2 | 61 | #include <asm/uaccess.h> |
| 1da177e4 | 62 | |
| 1da177e4 LT |
63 | #include <linux/crc-ccitt.h> |
| 64 | ||
| 65 | /* --------------------------------------------------------------------- */ | |
| 66 | ||
| 1da177e4 LT |
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; | |
| ae6134bd | 91 | buffer += len; |
| 1da177e4 LT |
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); | |
| 5a7616af | 157 | dev->stats.rx_dropped++; |
| 1da177e4 LT |
158 | return; |
| 159 | } | |
| 1da177e4 LT |
160 | cp = skb_put(skb, pkt_len); |
| 161 | *cp++ = 0; /* KISS kludge */ | |
| 162 | memcpy(cp, s->hdlcrx.buffer, pkt_len - 1); | |
| 56cb5156 | 163 | skb->protocol = ax25_type_trans(skb, dev); |
| 1da177e4 | 164 | netif_rx(skb); |
| 5a7616af | 165 | dev->stats.rx_packets++; |
| 1da177e4 LT |
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 | } | |
| d626f62b ACM |
320 | skb_copy_from_linear_data_offset(skb, 1, |
| 321 | s->hdlctx.buffer, | |
| 322 | pkt_len); | |
| 1da177e4 LT |
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; | |
| 5a7616af | 329 | dev->stats.tx_packets++; |
| 1da177e4 LT |
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 | ||
| 1da177e4 LT |
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; | |
| 8b5b4671 | 392 | if ((random32() % 256) > s->ch_params.ppersist) |
| 1da177e4 LT |
393 | return; |
| 394 | start_tx(dev, s); | |
| 395 | } | |
| 396 | ||
| 397 | /* --------------------------------------------------------------------- */ | |
| 398 | /* | |
| 399 | * ===================== network driver interface ========================= | |
| 400 | */ | |
| 401 | ||
| 36e4d64a SH |
402 | static netdev_tx_t hdlcdrv_send_packet(struct sk_buff *skb, |
| 403 | struct net_device *dev) | |
| 1da177e4 LT |
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); | |
| 6ed10654 | 410 | return NETDEV_TX_OK; |
| 1da177e4 LT |
411 | } |
| 412 | if (sm->skb) | |
| 5b548140 | 413 | return NETDEV_TX_LOCKED; |
| 1da177e4 LT |
414 | netif_stop_queue(dev); |
| 415 | sm->skb = skb; | |
| 6ed10654 | 416 | return NETDEV_TX_OK; |
| 1da177e4 LT |
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 | ||
| 1da177e4 LT |
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; | |
| 5a7616af SH |
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; | |
| 1da177e4 LT |
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 | ||
| 2d8b223d SH |
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 | ||
| 1da177e4 LT |
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 | ||
| 1da177e4 LT |
668 | |
| 669 | /* Fill in the fields of the device structure */ | |
| 670 | ||
| 671 | s->skb = NULL; | |
| 672 | ||
| 2d8b223d | 673 | dev->netdev_ops = &hdlcdrv_netdev; |
| 3b04ddde | 674 | dev->header_ops = &ax25_header_ops; |
| 1da177e4 LT |
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 */ | |
| 15b1c0e8 RB |
680 | memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN); |
| 681 | memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN); | |
| 1da177e4 LT |
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 | /* --------------------------------------------------------------------- */ |