sja1000.c revision 7146b2d9f11e07848050f53b71bafa37a95ae609
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 68MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>"); 69MODULE_LICENSE("Dual BSD/GPL"); 70MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver"); 71 72static 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 84static 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 98static int sja1000_is_absent(struct sja1000_priv *priv) 99{ 100 return (priv->read_reg(priv, REG_MOD) == 0xFF); 101} 102 103static 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 115static 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 139static 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 172static 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 189static int sja1000_set_mode(struct net_device *dev, enum can_mode mode) 190{ 191 struct sja1000_priv *priv = netdev_priv(dev); 192 193 if (!priv->open_time) 194 return -EINVAL; 195 196 switch (mode) { 197 case CAN_MODE_START: 198 sja1000_start(dev); 199 if (netif_queue_stopped(dev)) 200 netif_wake_queue(dev); 201 break; 202 203 default: 204 return -EOPNOTSUPP; 205 } 206 207 return 0; 208} 209 210static int sja1000_set_bittiming(struct net_device *dev) 211{ 212 struct sja1000_priv *priv = netdev_priv(dev); 213 struct can_bittiming *bt = &priv->can.bittiming; 214 u8 btr0, btr1; 215 216 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); 217 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | 218 (((bt->phase_seg2 - 1) & 0x7) << 4); 219 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 220 btr1 |= 0x80; 221 222 netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); 223 224 priv->write_reg(priv, REG_BTR0, btr0); 225 priv->write_reg(priv, REG_BTR1, btr1); 226 227 return 0; 228} 229 230static int sja1000_get_berr_counter(const struct net_device *dev, 231 struct can_berr_counter *bec) 232{ 233 struct sja1000_priv *priv = netdev_priv(dev); 234 235 bec->txerr = priv->read_reg(priv, REG_TXERR); 236 bec->rxerr = priv->read_reg(priv, REG_RXERR); 237 238 return 0; 239} 240 241/* 242 * initialize SJA1000 chip: 243 * - reset chip 244 * - set output mode 245 * - set baudrate 246 * - enable interrupts 247 * - start operating mode 248 */ 249static void chipset_init(struct net_device *dev) 250{ 251 struct sja1000_priv *priv = netdev_priv(dev); 252 253 /* set clock divider and output control register */ 254 priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN); 255 256 /* set acceptance filter (accept all) */ 257 priv->write_reg(priv, REG_ACCC0, 0x00); 258 priv->write_reg(priv, REG_ACCC1, 0x00); 259 priv->write_reg(priv, REG_ACCC2, 0x00); 260 priv->write_reg(priv, REG_ACCC3, 0x00); 261 262 priv->write_reg(priv, REG_ACCM0, 0xFF); 263 priv->write_reg(priv, REG_ACCM1, 0xFF); 264 priv->write_reg(priv, REG_ACCM2, 0xFF); 265 priv->write_reg(priv, REG_ACCM3, 0xFF); 266 267 priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL); 268} 269 270/* 271 * transmit a CAN message 272 * message layout in the sk_buff should be like this: 273 * xx xx xx xx ff ll 00 11 22 33 44 55 66 77 274 * [ can-id ] [flags] [len] [can data (up to 8 bytes] 275 */ 276static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb, 277 struct net_device *dev) 278{ 279 struct sja1000_priv *priv = netdev_priv(dev); 280 struct can_frame *cf = (struct can_frame *)skb->data; 281 uint8_t fi; 282 uint8_t dlc; 283 canid_t id; 284 uint8_t dreg; 285 int i; 286 287 if (can_dropped_invalid_skb(dev, skb)) 288 return NETDEV_TX_OK; 289 290 netif_stop_queue(dev); 291 292 fi = dlc = cf->can_dlc; 293 id = cf->can_id; 294 295 if (id & CAN_RTR_FLAG) 296 fi |= FI_RTR; 297 298 if (id & CAN_EFF_FLAG) { 299 fi |= FI_FF; 300 dreg = EFF_BUF; 301 priv->write_reg(priv, REG_FI, fi); 302 priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16)); 303 priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8)); 304 priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5); 305 priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3); 306 } else { 307 dreg = SFF_BUF; 308 priv->write_reg(priv, REG_FI, fi); 309 priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3); 310 priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5); 311 } 312 313 for (i = 0; i < dlc; i++) 314 priv->write_reg(priv, dreg++, cf->data[i]); 315 316 can_put_echo_skb(skb, dev, 0); 317 318 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT) 319 sja1000_write_cmdreg(priv, CMD_TR | CMD_AT); 320 else 321 sja1000_write_cmdreg(priv, CMD_TR); 322 323 return NETDEV_TX_OK; 324} 325 326static void sja1000_rx(struct net_device *dev) 327{ 328 struct sja1000_priv *priv = netdev_priv(dev); 329 struct net_device_stats *stats = &dev->stats; 330 struct can_frame *cf; 331 struct sk_buff *skb; 332 uint8_t fi; 333 uint8_t dreg; 334 canid_t id; 335 int i; 336 337 /* create zero'ed CAN frame buffer */ 338 skb = alloc_can_skb(dev, &cf); 339 if (skb == NULL) 340 return; 341 342 fi = priv->read_reg(priv, REG_FI); 343 344 if (fi & FI_FF) { 345 /* extended frame format (EFF) */ 346 dreg = EFF_BUF; 347 id = (priv->read_reg(priv, REG_ID1) << (5 + 16)) 348 | (priv->read_reg(priv, REG_ID2) << (5 + 8)) 349 | (priv->read_reg(priv, REG_ID3) << 5) 350 | (priv->read_reg(priv, REG_ID4) >> 3); 351 id |= CAN_EFF_FLAG; 352 } else { 353 /* standard frame format (SFF) */ 354 dreg = SFF_BUF; 355 id = (priv->read_reg(priv, REG_ID1) << 3) 356 | (priv->read_reg(priv, REG_ID2) >> 5); 357 } 358 359 cf->can_dlc = get_can_dlc(fi & 0x0F); 360 if (fi & FI_RTR) { 361 id |= CAN_RTR_FLAG; 362 } else { 363 for (i = 0; i < cf->can_dlc; i++) 364 cf->data[i] = priv->read_reg(priv, dreg++); 365 } 366 367 cf->can_id = id; 368 369 /* release receive buffer */ 370 sja1000_write_cmdreg(priv, CMD_RRB); 371 372 netif_rx(skb); 373 374 stats->rx_packets++; 375 stats->rx_bytes += cf->can_dlc; 376} 377 378static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) 379{ 380 struct sja1000_priv *priv = netdev_priv(dev); 381 struct net_device_stats *stats = &dev->stats; 382 struct can_frame *cf; 383 struct sk_buff *skb; 384 enum can_state state = priv->can.state; 385 uint8_t ecc, alc; 386 387 skb = alloc_can_err_skb(dev, &cf); 388 if (skb == NULL) 389 return -ENOMEM; 390 391 if (isrc & IRQ_DOI) { 392 /* data overrun interrupt */ 393 netdev_dbg(dev, "data overrun interrupt\n"); 394 cf->can_id |= CAN_ERR_CRTL; 395 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; 396 stats->rx_over_errors++; 397 stats->rx_errors++; 398 sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */ 399 } 400 401 if (isrc & IRQ_EI) { 402 /* error warning interrupt */ 403 netdev_dbg(dev, "error warning interrupt\n"); 404 405 if (status & SR_BS) { 406 state = CAN_STATE_BUS_OFF; 407 cf->can_id |= CAN_ERR_BUSOFF; 408 can_bus_off(dev); 409 } else if (status & SR_ES) { 410 state = CAN_STATE_ERROR_WARNING; 411 } else 412 state = CAN_STATE_ERROR_ACTIVE; 413 } 414 if (isrc & IRQ_BEI) { 415 /* bus error interrupt */ 416 priv->can.can_stats.bus_error++; 417 stats->rx_errors++; 418 419 ecc = priv->read_reg(priv, REG_ECC); 420 421 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 422 423 switch (ecc & ECC_MASK) { 424 case ECC_BIT: 425 cf->data[2] |= CAN_ERR_PROT_BIT; 426 break; 427 case ECC_FORM: 428 cf->data[2] |= CAN_ERR_PROT_FORM; 429 break; 430 case ECC_STUFF: 431 cf->data[2] |= CAN_ERR_PROT_STUFF; 432 break; 433 default: 434 cf->data[2] |= CAN_ERR_PROT_UNSPEC; 435 cf->data[3] = ecc & ECC_SEG; 436 break; 437 } 438 /* Error occurred during transmission? */ 439 if ((ecc & ECC_DIR) == 0) 440 cf->data[2] |= CAN_ERR_PROT_TX; 441 } 442 if (isrc & IRQ_EPI) { 443 /* error passive interrupt */ 444 netdev_dbg(dev, "error passive interrupt\n"); 445 if (status & SR_ES) 446 state = CAN_STATE_ERROR_PASSIVE; 447 else 448 state = CAN_STATE_ERROR_ACTIVE; 449 } 450 if (isrc & IRQ_ALI) { 451 /* arbitration lost interrupt */ 452 netdev_dbg(dev, "arbitration lost interrupt\n"); 453 alc = priv->read_reg(priv, REG_ALC); 454 priv->can.can_stats.arbitration_lost++; 455 stats->tx_errors++; 456 cf->can_id |= CAN_ERR_LOSTARB; 457 cf->data[0] = alc & 0x1f; 458 } 459 460 if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING || 461 state == CAN_STATE_ERROR_PASSIVE)) { 462 uint8_t rxerr = priv->read_reg(priv, REG_RXERR); 463 uint8_t txerr = priv->read_reg(priv, REG_TXERR); 464 cf->can_id |= CAN_ERR_CRTL; 465 if (state == CAN_STATE_ERROR_WARNING) { 466 priv->can.can_stats.error_warning++; 467 cf->data[1] = (txerr > rxerr) ? 468 CAN_ERR_CRTL_TX_WARNING : 469 CAN_ERR_CRTL_RX_WARNING; 470 } else { 471 priv->can.can_stats.error_passive++; 472 cf->data[1] = (txerr > rxerr) ? 473 CAN_ERR_CRTL_TX_PASSIVE : 474 CAN_ERR_CRTL_RX_PASSIVE; 475 } 476 cf->data[6] = txerr; 477 cf->data[7] = rxerr; 478 } 479 480 priv->can.state = state; 481 482 netif_rx(skb); 483 484 stats->rx_packets++; 485 stats->rx_bytes += cf->can_dlc; 486 487 return 0; 488} 489 490irqreturn_t sja1000_interrupt(int irq, void *dev_id) 491{ 492 struct net_device *dev = (struct net_device *)dev_id; 493 struct sja1000_priv *priv = netdev_priv(dev); 494 struct net_device_stats *stats = &dev->stats; 495 uint8_t isrc, status; 496 int n = 0; 497 498 /* Shared interrupts and IRQ off? */ 499 if (priv->read_reg(priv, REG_IER) == IRQ_OFF) 500 return IRQ_NONE; 501 502 if (priv->pre_irq) 503 priv->pre_irq(priv); 504 505 while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) { 506 n++; 507 status = priv->read_reg(priv, REG_SR); 508 /* check for absent controller due to hw unplug */ 509 if (status == 0xFF && sja1000_is_absent(priv)) 510 return IRQ_NONE; 511 512 if (isrc & IRQ_WUI) 513 netdev_warn(dev, "wakeup interrupt\n"); 514 515 if (isrc & IRQ_TI) { 516 /* transmission buffer released */ 517 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT && 518 !(status & SR_TCS)) { 519 stats->tx_errors++; 520 can_free_echo_skb(dev, 0); 521 } else { 522 /* transmission complete */ 523 stats->tx_bytes += 524 priv->read_reg(priv, REG_FI) & 0xf; 525 stats->tx_packets++; 526 can_get_echo_skb(dev, 0); 527 } 528 netif_wake_queue(dev); 529 } 530 if (isrc & IRQ_RI) { 531 /* receive interrupt */ 532 while (status & SR_RBS) { 533 sja1000_rx(dev); 534 status = priv->read_reg(priv, REG_SR); 535 /* check for absent controller */ 536 if (status == 0xFF && sja1000_is_absent(priv)) 537 return IRQ_NONE; 538 } 539 } 540 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) { 541 /* error interrupt */ 542 if (sja1000_err(dev, isrc, status)) 543 break; 544 } 545 } 546 547 if (priv->post_irq) 548 priv->post_irq(priv); 549 550 if (n >= SJA1000_MAX_IRQ) 551 netdev_dbg(dev, "%d messages handled in ISR", n); 552 553 return (n) ? IRQ_HANDLED : IRQ_NONE; 554} 555EXPORT_SYMBOL_GPL(sja1000_interrupt); 556 557static int sja1000_open(struct net_device *dev) 558{ 559 struct sja1000_priv *priv = netdev_priv(dev); 560 int err; 561 562 /* set chip into reset mode */ 563 set_reset_mode(dev); 564 565 /* common open */ 566 err = open_candev(dev); 567 if (err) 568 return err; 569 570 /* register interrupt handler, if not done by the device driver */ 571 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) { 572 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags, 573 dev->name, (void *)dev); 574 if (err) { 575 close_candev(dev); 576 return -EAGAIN; 577 } 578 } 579 580 /* init and start chi */ 581 sja1000_start(dev); 582 priv->open_time = jiffies; 583 584 netif_start_queue(dev); 585 586 return 0; 587} 588 589static int sja1000_close(struct net_device *dev) 590{ 591 struct sja1000_priv *priv = netdev_priv(dev); 592 593 netif_stop_queue(dev); 594 set_reset_mode(dev); 595 596 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) 597 free_irq(dev->irq, (void *)dev); 598 599 close_candev(dev); 600 601 priv->open_time = 0; 602 603 return 0; 604} 605 606struct net_device *alloc_sja1000dev(int sizeof_priv) 607{ 608 struct net_device *dev; 609 struct sja1000_priv *priv; 610 611 dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv, 612 SJA1000_ECHO_SKB_MAX); 613 if (!dev) 614 return NULL; 615 616 priv = netdev_priv(dev); 617 618 priv->dev = dev; 619 priv->can.bittiming_const = &sja1000_bittiming_const; 620 priv->can.do_set_bittiming = sja1000_set_bittiming; 621 priv->can.do_set_mode = sja1000_set_mode; 622 priv->can.do_get_berr_counter = sja1000_get_berr_counter; 623 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | 624 CAN_CTRLMODE_BERR_REPORTING | CAN_CTRLMODE_LISTENONLY | 625 CAN_CTRLMODE_ONE_SHOT; 626 627 spin_lock_init(&priv->cmdreg_lock); 628 629 if (sizeof_priv) 630 priv->priv = (void *)priv + sizeof(struct sja1000_priv); 631 632 return dev; 633} 634EXPORT_SYMBOL_GPL(alloc_sja1000dev); 635 636void free_sja1000dev(struct net_device *dev) 637{ 638 free_candev(dev); 639} 640EXPORT_SYMBOL_GPL(free_sja1000dev); 641 642static const struct net_device_ops sja1000_netdev_ops = { 643 .ndo_open = sja1000_open, 644 .ndo_stop = sja1000_close, 645 .ndo_start_xmit = sja1000_start_xmit, 646}; 647 648int register_sja1000dev(struct net_device *dev) 649{ 650 if (!sja1000_probe_chip(dev)) 651 return -ENODEV; 652 653 dev->flags |= IFF_ECHO; /* we support local echo */ 654 dev->netdev_ops = &sja1000_netdev_ops; 655 656 set_reset_mode(dev); 657 chipset_init(dev); 658 659 return register_candev(dev); 660} 661EXPORT_SYMBOL_GPL(register_sja1000dev); 662 663void unregister_sja1000dev(struct net_device *dev) 664{ 665 set_reset_mode(dev); 666 unregister_candev(dev); 667} 668EXPORT_SYMBOL_GPL(unregister_sja1000dev); 669 670static __init int sja1000_init(void) 671{ 672 printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME); 673 674 return 0; 675} 676 677module_init(sja1000_init); 678 679static __exit void sja1000_exit(void) 680{ 681 printk(KERN_INFO "%s: driver removed\n", DRV_NAME); 682} 683 684module_exit(sja1000_exit); 685