1 /* 2 * sja1000.c - Philips SJA1000 network device driver 3 * 4 * Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33, 5 * 38106 Braunschweig, GERMANY 6 * 7 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of Volkswagen nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * Alternatively, provided that this notice is retained in full, this 23 * software may be distributed under the terms of the GNU General 24 * Public License ("GPL") version 2, in which case the provisions of the 25 * GPL apply INSTEAD OF those given above. 26 * 27 * The provided data structures and external interfaces from this code 28 * are not restricted to be used by modules with a GPL compatible license. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 31 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 32 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 33 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 34 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 35 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 36 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 40 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 41 * DAMAGE. 42 * 43 */ 44 45 #include <linux/module.h> 46 #include <linux/init.h> 47 #include <linux/kernel.h> 48 #include <linux/sched.h> 49 #include <linux/types.h> 50 #include <linux/fcntl.h> 51 #include <linux/interrupt.h> 52 #include <linux/ptrace.h> 53 #include <linux/string.h> 54 #include <linux/errno.h> 55 #include <linux/netdevice.h> 56 #include <linux/if_arp.h> 57 #include <linux/if_ether.h> 58 #include <linux/skbuff.h> 59 #include <linux/delay.h> 60 61 #include <linux/can/dev.h> 62 #include <linux/can/error.h> 63 64 #include "sja1000.h" 65 66 #define DRV_NAME "sja1000" 67 68 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>"); 69 MODULE_LICENSE("Dual BSD/GPL"); 70 MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver"); 71 72 static const struct can_bittiming_const sja1000_bittiming_const = { 73 .name = DRV_NAME, 74 .tseg1_min = 1, 75 .tseg1_max = 16, 76 .tseg2_min = 1, 77 .tseg2_max = 8, 78 .sjw_max = 4, 79 .brp_min = 1, 80 .brp_max = 64, 81 .brp_inc = 1, 82 }; 83 84 static void sja1000_write_cmdreg(struct sja1000_priv *priv, u8 val) 85 { 86 unsigned long flags; 87 88 /* 89 * The command register needs some locking and time to settle 90 * the write_reg() operation - especially on SMP systems. 91 */ 92 spin_lock_irqsave(&priv->cmdreg_lock, flags); 93 priv->write_reg(priv, REG_CMR, val); 94 priv->read_reg(priv, REG_SR); 95 spin_unlock_irqrestore(&priv->cmdreg_lock, flags); 96 } 97 98 static int sja1000_is_absent(struct sja1000_priv *priv) 99 { 100 return (priv->read_reg(priv, REG_MOD) == 0xFF); 101 } 102 103 static int sja1000_probe_chip(struct net_device *dev) 104 { 105 struct sja1000_priv *priv = netdev_priv(dev); 106 107 if (priv->reg_base && sja1000_is_absent(priv)) { 108 printk(KERN_INFO "%s: probing @0x%lX failed\n", 109 DRV_NAME, dev->base_addr); 110 return 0; 111 } 112 return -1; 113 } 114 115 static void set_reset_mode(struct net_device *dev) 116 { 117 struct sja1000_priv *priv = netdev_priv(dev); 118 unsigned char status = priv->read_reg(priv, REG_MOD); 119 int i; 120 121 /* disable interrupts */ 122 priv->write_reg(priv, REG_IER, IRQ_OFF); 123 124 for (i = 0; i < 100; i++) { 125 /* check reset bit */ 126 if (status & MOD_RM) { 127 priv->can.state = CAN_STATE_STOPPED; 128 return; 129 } 130 131 priv->write_reg(priv, REG_MOD, MOD_RM); /* reset chip */ 132 udelay(10); 133 status = priv->read_reg(priv, REG_MOD); 134 } 135 136 netdev_err(dev, "setting SJA1000 into reset mode failed!\n"); 137 } 138 139 static void set_normal_mode(struct net_device *dev) 140 { 141 struct sja1000_priv *priv = netdev_priv(dev); 142 unsigned char status = priv->read_reg(priv, REG_MOD); 143 int i; 144 145 for (i = 0; i < 100; i++) { 146 /* check reset bit */ 147 if ((status & MOD_RM) == 0) { 148 priv->can.state = CAN_STATE_ERROR_ACTIVE; 149 /* enable interrupts */ 150 if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) 151 priv->write_reg(priv, REG_IER, IRQ_ALL); 152 else 153 priv->write_reg(priv, REG_IER, 154 IRQ_ALL & ~IRQ_BEI); 155 return; 156 } 157 158 /* set chip to normal mode */ 159 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) 160 priv->write_reg(priv, REG_MOD, MOD_LOM); 161 else 162 priv->write_reg(priv, REG_MOD, 0x00); 163 164 udelay(10); 165 166 status = priv->read_reg(priv, REG_MOD); 167 } 168 169 netdev_err(dev, "setting SJA1000 into normal mode failed!\n"); 170 } 171 172 static void sja1000_start(struct net_device *dev) 173 { 174 struct sja1000_priv *priv = netdev_priv(dev); 175 176 /* leave reset mode */ 177 if (priv->can.state != CAN_STATE_STOPPED) 178 set_reset_mode(dev); 179 180 /* Clear error counters and error code capture */ 181 priv->write_reg(priv, REG_TXERR, 0x0); 182 priv->write_reg(priv, REG_RXERR, 0x0); 183 priv->read_reg(priv, REG_ECC); 184 185 /* leave reset mode */ 186 set_normal_mode(dev); 187 } 188 189 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode) 190 { 191 switch (mode) { 192 case CAN_MODE_START: 193 sja1000_start(dev); 194 if (netif_queue_stopped(dev)) 195 netif_wake_queue(dev); 196 break; 197 198 default: 199 return -EOPNOTSUPP; 200 } 201 202 return 0; 203 } 204 205 static int sja1000_set_bittiming(struct net_device *dev) 206 { 207 struct sja1000_priv *priv = netdev_priv(dev); 208 struct can_bittiming *bt = &priv->can.bittiming; 209 u8 btr0, btr1; 210 211 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); 212 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | 213 (((bt->phase_seg2 - 1) & 0x7) << 4); 214 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 215 btr1 |= 0x80; 216 217 netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); 218 219 priv->write_reg(priv, REG_BTR0, btr0); 220 priv->write_reg(priv, REG_BTR1, btr1); 221 222 return 0; 223 } 224 225 static int sja1000_get_berr_counter(const struct net_device *dev, 226 struct can_berr_counter *bec) 227 { 228 struct sja1000_priv *priv = netdev_priv(dev); 229 230 bec->txerr = priv->read_reg(priv, REG_TXERR); 231 bec->rxerr = priv->read_reg(priv, REG_RXERR); 232 233 return 0; 234 } 235 236 /* 237 * initialize SJA1000 chip: 238 * - reset chip 239 * - set output mode 240 * - set baudrate 241 * - enable interrupts 242 * - start operating mode 243 */ 244 static void chipset_init(struct net_device *dev) 245 { 246 struct sja1000_priv *priv = netdev_priv(dev); 247 248 /* set clock divider and output control register */ 249 priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN); 250 251 /* set acceptance filter (accept all) */ 252 priv->write_reg(priv, REG_ACCC0, 0x00); 253 priv->write_reg(priv, REG_ACCC1, 0x00); 254 priv->write_reg(priv, REG_ACCC2, 0x00); 255 priv->write_reg(priv, REG_ACCC3, 0x00); 256 257 priv->write_reg(priv, REG_ACCM0, 0xFF); 258 priv->write_reg(priv, REG_ACCM1, 0xFF); 259 priv->write_reg(priv, REG_ACCM2, 0xFF); 260 priv->write_reg(priv, REG_ACCM3, 0xFF); 261 262 priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL); 263 } 264 265 /* 266 * transmit a CAN message 267 * message layout in the sk_buff should be like this: 268 * xx xx xx xx ff ll 00 11 22 33 44 55 66 77 269 * [ can-id ] [flags] [len] [can data (up to 8 bytes] 270 */ 271 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb, 272 struct net_device *dev) 273 { 274 struct sja1000_priv *priv = netdev_priv(dev); 275 struct can_frame *cf = (struct can_frame *)skb->data; 276 uint8_t fi; 277 uint8_t dlc; 278 canid_t id; 279 uint8_t dreg; 280 int i; 281 282 if (can_dropped_invalid_skb(dev, skb)) 283 return NETDEV_TX_OK; 284 285 netif_stop_queue(dev); 286 287 fi = dlc = cf->can_dlc; 288 id = cf->can_id; 289 290 if (id & CAN_RTR_FLAG) 291 fi |= FI_RTR; 292 293 if (id & CAN_EFF_FLAG) { 294 fi |= FI_FF; 295 dreg = EFF_BUF; 296 priv->write_reg(priv, REG_FI, fi); 297 priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16)); 298 priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8)); 299 priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5); 300 priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3); 301 } else { 302 dreg = SFF_BUF; 303 priv->write_reg(priv, REG_FI, fi); 304 priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3); 305 priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5); 306 } 307 308 for (i = 0; i < dlc; i++) 309 priv->write_reg(priv, dreg++, cf->data[i]); 310 311 can_put_echo_skb(skb, dev, 0); 312 313 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT) 314 sja1000_write_cmdreg(priv, CMD_TR | CMD_AT); 315 else 316 sja1000_write_cmdreg(priv, CMD_TR); 317 318 return NETDEV_TX_OK; 319 } 320 321 static void sja1000_rx(struct net_device *dev) 322 { 323 struct sja1000_priv *priv = netdev_priv(dev); 324 struct net_device_stats *stats = &dev->stats; 325 struct can_frame *cf; 326 struct sk_buff *skb; 327 uint8_t fi; 328 uint8_t dreg; 329 canid_t id; 330 int i; 331 332 /* create zero'ed CAN frame buffer */ 333 skb = alloc_can_skb(dev, &cf); 334 if (skb == NULL) 335 return; 336 337 fi = priv->read_reg(priv, REG_FI); 338 339 if (fi & FI_FF) { 340 /* extended frame format (EFF) */ 341 dreg = EFF_BUF; 342 id = (priv->read_reg(priv, REG_ID1) << (5 + 16)) 343 | (priv->read_reg(priv, REG_ID2) << (5 + 8)) 344 | (priv->read_reg(priv, REG_ID3) << 5) 345 | (priv->read_reg(priv, REG_ID4) >> 3); 346 id |= CAN_EFF_FLAG; 347 } else { 348 /* standard frame format (SFF) */ 349 dreg = SFF_BUF; 350 id = (priv->read_reg(priv, REG_ID1) << 3) 351 | (priv->read_reg(priv, REG_ID2) >> 5); 352 } 353 354 cf->can_dlc = get_can_dlc(fi & 0x0F); 355 if (fi & FI_RTR) { 356 id |= CAN_RTR_FLAG; 357 } else { 358 for (i = 0; i < cf->can_dlc; i++) 359 cf->data[i] = priv->read_reg(priv, dreg++); 360 } 361 362 cf->can_id = id; 363 364 /* release receive buffer */ 365 sja1000_write_cmdreg(priv, CMD_RRB); 366 367 netif_rx(skb); 368 369 stats->rx_packets++; 370 stats->rx_bytes += cf->can_dlc; 371 } 372 373 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) 374 { 375 struct sja1000_priv *priv = netdev_priv(dev); 376 struct net_device_stats *stats = &dev->stats; 377 struct can_frame *cf; 378 struct sk_buff *skb; 379 enum can_state state = priv->can.state; 380 uint8_t ecc, alc; 381 382 skb = alloc_can_err_skb(dev, &cf); 383 if (skb == NULL) 384 return -ENOMEM; 385 386 if (isrc & IRQ_DOI) { 387 /* data overrun interrupt */ 388 netdev_dbg(dev, "data overrun interrupt\n"); 389 cf->can_id |= CAN_ERR_CRTL; 390 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; 391 stats->rx_over_errors++; 392 stats->rx_errors++; 393 sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */ 394 } 395 396 if (isrc & IRQ_EI) { 397 /* error warning interrupt */ 398 netdev_dbg(dev, "error warning interrupt\n"); 399 400 if (status & SR_BS) { 401 state = CAN_STATE_BUS_OFF; 402 cf->can_id |= CAN_ERR_BUSOFF; 403 can_bus_off(dev); 404 } else if (status & SR_ES) { 405 state = CAN_STATE_ERROR_WARNING; 406 } else 407 state = CAN_STATE_ERROR_ACTIVE; 408 } 409 if (isrc & IRQ_BEI) { 410 /* bus error interrupt */ 411 priv->can.can_stats.bus_error++; 412 stats->rx_errors++; 413 414 ecc = priv->read_reg(priv, REG_ECC); 415 416 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 417 418 switch (ecc & ECC_MASK) { 419 case ECC_BIT: 420 cf->data[2] |= CAN_ERR_PROT_BIT; 421 break; 422 case ECC_FORM: 423 cf->data[2] |= CAN_ERR_PROT_FORM; 424 break; 425 case ECC_STUFF: 426 cf->data[2] |= CAN_ERR_PROT_STUFF; 427 break; 428 default: 429 cf->data[2] |= CAN_ERR_PROT_UNSPEC; 430 cf->data[3] = ecc & ECC_SEG; 431 break; 432 } 433 /* Error occurred during transmission? */ 434 if ((ecc & ECC_DIR) == 0) 435 cf->data[2] |= CAN_ERR_PROT_TX; 436 } 437 if (isrc & IRQ_EPI) { 438 /* error passive interrupt */ 439 netdev_dbg(dev, "error passive interrupt\n"); 440 if (status & SR_ES) 441 state = CAN_STATE_ERROR_PASSIVE; 442 else 443 state = CAN_STATE_ERROR_ACTIVE; 444 } 445 if (isrc & IRQ_ALI) { 446 /* arbitration lost interrupt */ 447 netdev_dbg(dev, "arbitration lost interrupt\n"); 448 alc = priv->read_reg(priv, REG_ALC); 449 priv->can.can_stats.arbitration_lost++; 450 stats->tx_errors++; 451 cf->can_id |= CAN_ERR_LOSTARB; 452 cf->data[0] = alc & 0x1f; 453 } 454 455 if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING || 456 state == CAN_STATE_ERROR_PASSIVE)) { 457 uint8_t rxerr = priv->read_reg(priv, REG_RXERR); 458 uint8_t txerr = priv->read_reg(priv, REG_TXERR); 459 cf->can_id |= CAN_ERR_CRTL; 460 if (state == CAN_STATE_ERROR_WARNING) { 461 priv->can.can_stats.error_warning++; 462 cf->data[1] = (txerr > rxerr) ? 463 CAN_ERR_CRTL_TX_WARNING : 464 CAN_ERR_CRTL_RX_WARNING; 465 } else { 466 priv->can.can_stats.error_passive++; 467 cf->data[1] = (txerr > rxerr) ? 468 CAN_ERR_CRTL_TX_PASSIVE : 469 CAN_ERR_CRTL_RX_PASSIVE; 470 } 471 cf->data[6] = txerr; 472 cf->data[7] = rxerr; 473 } 474 475 priv->can.state = state; 476 477 netif_rx(skb); 478 479 stats->rx_packets++; 480 stats->rx_bytes += cf->can_dlc; 481 482 return 0; 483 } 484 485 irqreturn_t sja1000_interrupt(int irq, void *dev_id) 486 { 487 struct net_device *dev = (struct net_device *)dev_id; 488 struct sja1000_priv *priv = netdev_priv(dev); 489 struct net_device_stats *stats = &dev->stats; 490 uint8_t isrc, status; 491 int n = 0; 492 493 /* Shared interrupts and IRQ off? */ 494 if (priv->read_reg(priv, REG_IER) == IRQ_OFF) 495 return IRQ_NONE; 496 497 if (priv->pre_irq) 498 priv->pre_irq(priv); 499 500 while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) { 501 n++; 502 status = priv->read_reg(priv, REG_SR); 503 /* check for absent controller due to hw unplug */ 504 if (status == 0xFF && sja1000_is_absent(priv)) 505 return IRQ_NONE; 506 507 if (isrc & IRQ_WUI) 508 netdev_warn(dev, "wakeup interrupt\n"); 509 510 if (isrc & IRQ_TI) { 511 /* transmission buffer released */ 512 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT && 513 !(status & SR_TCS)) { 514 stats->tx_errors++; 515 can_free_echo_skb(dev, 0); 516 } else { 517 /* transmission complete */ 518 stats->tx_bytes += 519 priv->read_reg(priv, REG_FI) & 0xf; 520 stats->tx_packets++; 521 can_get_echo_skb(dev, 0); 522 } 523 netif_wake_queue(dev); 524 } 525 if (isrc & IRQ_RI) { 526 /* receive interrupt */ 527 while (status & SR_RBS) { 528 sja1000_rx(dev); 529 status = priv->read_reg(priv, REG_SR); 530 /* check for absent controller */ 531 if (status == 0xFF && sja1000_is_absent(priv)) 532 return IRQ_NONE; 533 } 534 } 535 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) { 536 /* error interrupt */ 537 if (sja1000_err(dev, isrc, status)) 538 break; 539 } 540 } 541 542 if (priv->post_irq) 543 priv->post_irq(priv); 544 545 if (n >= SJA1000_MAX_IRQ) 546 netdev_dbg(dev, "%d messages handled in ISR", n); 547 548 return (n) ? IRQ_HANDLED : IRQ_NONE; 549 } 550 EXPORT_SYMBOL_GPL(sja1000_interrupt); 551 552 static int sja1000_open(struct net_device *dev) 553 { 554 struct sja1000_priv *priv = netdev_priv(dev); 555 int err; 556 557 /* set chip into reset mode */ 558 set_reset_mode(dev); 559 560 /* common open */ 561 err = open_candev(dev); 562 if (err) 563 return err; 564 565 /* register interrupt handler, if not done by the device driver */ 566 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) { 567 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags, 568 dev->name, (void *)dev); 569 if (err) { 570 close_candev(dev); 571 return -EAGAIN; 572 } 573 } 574 575 /* init and start chi */ 576 sja1000_start(dev); 577 578 netif_start_queue(dev); 579 580 return 0; 581 } 582 583 static int sja1000_close(struct net_device *dev) 584 { 585 struct sja1000_priv *priv = netdev_priv(dev); 586 587 netif_stop_queue(dev); 588 set_reset_mode(dev); 589 590 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) 591 free_irq(dev->irq, (void *)dev); 592 593 close_candev(dev); 594 595 return 0; 596 } 597 598 struct net_device *alloc_sja1000dev(int sizeof_priv) 599 { 600 struct net_device *dev; 601 struct sja1000_priv *priv; 602 603 dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv, 604 SJA1000_ECHO_SKB_MAX); 605 if (!dev) 606 return NULL; 607 608 priv = netdev_priv(dev); 609 610 priv->dev = dev; 611 priv->can.bittiming_const = &sja1000_bittiming_const; 612 priv->can.do_set_bittiming = sja1000_set_bittiming; 613 priv->can.do_set_mode = sja1000_set_mode; 614 priv->can.do_get_berr_counter = sja1000_get_berr_counter; 615 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | 616 CAN_CTRLMODE_BERR_REPORTING | CAN_CTRLMODE_LISTENONLY | 617 CAN_CTRLMODE_ONE_SHOT; 618 619 spin_lock_init(&priv->cmdreg_lock); 620 621 if (sizeof_priv) 622 priv->priv = (void *)priv + sizeof(struct sja1000_priv); 623 624 return dev; 625 } 626 EXPORT_SYMBOL_GPL(alloc_sja1000dev); 627 628 void free_sja1000dev(struct net_device *dev) 629 { 630 free_candev(dev); 631 } 632 EXPORT_SYMBOL_GPL(free_sja1000dev); 633 634 static const struct net_device_ops sja1000_netdev_ops = { 635 .ndo_open = sja1000_open, 636 .ndo_stop = sja1000_close, 637 .ndo_start_xmit = sja1000_start_xmit, 638 }; 639 640 int register_sja1000dev(struct net_device *dev) 641 { 642 if (!sja1000_probe_chip(dev)) 643 return -ENODEV; 644 645 dev->flags |= IFF_ECHO; /* we support local echo */ 646 dev->netdev_ops = &sja1000_netdev_ops; 647 648 set_reset_mode(dev); 649 chipset_init(dev); 650 651 return register_candev(dev); 652 } 653 EXPORT_SYMBOL_GPL(register_sja1000dev); 654 655 void unregister_sja1000dev(struct net_device *dev) 656 { 657 set_reset_mode(dev); 658 unregister_candev(dev); 659 } 660 EXPORT_SYMBOL_GPL(unregister_sja1000dev); 661 662 static __init int sja1000_init(void) 663 { 664 printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME); 665 666 return 0; 667 } 668 669 module_init(sja1000_init); 670 671 static __exit void sja1000_exit(void) 672 { 673 printk(KERN_INFO "%s: driver removed\n", DRV_NAME); 674 } 675 676 module_exit(sja1000_exit); 677