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 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 priv->write_reg(priv, REG_MOD, 0x00); 160 udelay(10); 161 status = priv->read_reg(priv, REG_MOD); 162 } 163 164 netdev_err(dev, "setting SJA1000 into normal mode failed!\n"); 165 } 166 167 static void sja1000_start(struct net_device *dev) 168 { 169 struct sja1000_priv *priv = netdev_priv(dev); 170 171 /* leave reset mode */ 172 if (priv->can.state != CAN_STATE_STOPPED) 173 set_reset_mode(dev); 174 175 /* Clear error counters and error code capture */ 176 priv->write_reg(priv, REG_TXERR, 0x0); 177 priv->write_reg(priv, REG_RXERR, 0x0); 178 priv->read_reg(priv, REG_ECC); 179 180 /* leave reset mode */ 181 set_normal_mode(dev); 182 } 183 184 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode) 185 { 186 struct sja1000_priv *priv = netdev_priv(dev); 187 188 if (!priv->open_time) 189 return -EINVAL; 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 sja1000_write_cmdreg(priv, CMD_TR); 314 315 return NETDEV_TX_OK; 316 } 317 318 static void sja1000_rx(struct net_device *dev) 319 { 320 struct sja1000_priv *priv = netdev_priv(dev); 321 struct net_device_stats *stats = &dev->stats; 322 struct can_frame *cf; 323 struct sk_buff *skb; 324 uint8_t fi; 325 uint8_t dreg; 326 canid_t id; 327 int i; 328 329 /* create zero'ed CAN frame buffer */ 330 skb = alloc_can_skb(dev, &cf); 331 if (skb == NULL) 332 return; 333 334 fi = priv->read_reg(priv, REG_FI); 335 336 if (fi & FI_FF) { 337 /* extended frame format (EFF) */ 338 dreg = EFF_BUF; 339 id = (priv->read_reg(priv, REG_ID1) << (5 + 16)) 340 | (priv->read_reg(priv, REG_ID2) << (5 + 8)) 341 | (priv->read_reg(priv, REG_ID3) << 5) 342 | (priv->read_reg(priv, REG_ID4) >> 3); 343 id |= CAN_EFF_FLAG; 344 } else { 345 /* standard frame format (SFF) */ 346 dreg = SFF_BUF; 347 id = (priv->read_reg(priv, REG_ID1) << 3) 348 | (priv->read_reg(priv, REG_ID2) >> 5); 349 } 350 351 cf->can_dlc = get_can_dlc(fi & 0x0F); 352 if (fi & FI_RTR) { 353 id |= CAN_RTR_FLAG; 354 } else { 355 for (i = 0; i < cf->can_dlc; i++) 356 cf->data[i] = priv->read_reg(priv, dreg++); 357 } 358 359 cf->can_id = id; 360 361 /* release receive buffer */ 362 sja1000_write_cmdreg(priv, CMD_RRB); 363 364 netif_rx(skb); 365 366 stats->rx_packets++; 367 stats->rx_bytes += cf->can_dlc; 368 } 369 370 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) 371 { 372 struct sja1000_priv *priv = netdev_priv(dev); 373 struct net_device_stats *stats = &dev->stats; 374 struct can_frame *cf; 375 struct sk_buff *skb; 376 enum can_state state = priv->can.state; 377 uint8_t ecc, alc; 378 379 skb = alloc_can_err_skb(dev, &cf); 380 if (skb == NULL) 381 return -ENOMEM; 382 383 if (isrc & IRQ_DOI) { 384 /* data overrun interrupt */ 385 netdev_dbg(dev, "data overrun interrupt\n"); 386 cf->can_id |= CAN_ERR_CRTL; 387 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; 388 stats->rx_over_errors++; 389 stats->rx_errors++; 390 sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */ 391 } 392 393 if (isrc & IRQ_EI) { 394 /* error warning interrupt */ 395 netdev_dbg(dev, "error warning interrupt\n"); 396 397 if (status & SR_BS) { 398 state = CAN_STATE_BUS_OFF; 399 cf->can_id |= CAN_ERR_BUSOFF; 400 can_bus_off(dev); 401 } else if (status & SR_ES) { 402 state = CAN_STATE_ERROR_WARNING; 403 } else 404 state = CAN_STATE_ERROR_ACTIVE; 405 } 406 if (isrc & IRQ_BEI) { 407 /* bus error interrupt */ 408 priv->can.can_stats.bus_error++; 409 stats->rx_errors++; 410 411 ecc = priv->read_reg(priv, REG_ECC); 412 413 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 414 415 switch (ecc & ECC_MASK) { 416 case ECC_BIT: 417 cf->data[2] |= CAN_ERR_PROT_BIT; 418 break; 419 case ECC_FORM: 420 cf->data[2] |= CAN_ERR_PROT_FORM; 421 break; 422 case ECC_STUFF: 423 cf->data[2] |= CAN_ERR_PROT_STUFF; 424 break; 425 default: 426 cf->data[2] |= CAN_ERR_PROT_UNSPEC; 427 cf->data[3] = ecc & ECC_SEG; 428 break; 429 } 430 /* Error occurred during transmission? */ 431 if ((ecc & ECC_DIR) == 0) 432 cf->data[2] |= CAN_ERR_PROT_TX; 433 } 434 if (isrc & IRQ_EPI) { 435 /* error passive interrupt */ 436 netdev_dbg(dev, "error passive interrupt\n"); 437 if (status & SR_ES) 438 state = CAN_STATE_ERROR_PASSIVE; 439 else 440 state = CAN_STATE_ERROR_ACTIVE; 441 } 442 if (isrc & IRQ_ALI) { 443 /* arbitration lost interrupt */ 444 netdev_dbg(dev, "arbitration lost interrupt\n"); 445 alc = priv->read_reg(priv, REG_ALC); 446 priv->can.can_stats.arbitration_lost++; 447 stats->tx_errors++; 448 cf->can_id |= CAN_ERR_LOSTARB; 449 cf->data[0] = alc & 0x1f; 450 } 451 452 if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING || 453 state == CAN_STATE_ERROR_PASSIVE)) { 454 uint8_t rxerr = priv->read_reg(priv, REG_RXERR); 455 uint8_t txerr = priv->read_reg(priv, REG_TXERR); 456 cf->can_id |= CAN_ERR_CRTL; 457 if (state == CAN_STATE_ERROR_WARNING) { 458 priv->can.can_stats.error_warning++; 459 cf->data[1] = (txerr > rxerr) ? 460 CAN_ERR_CRTL_TX_WARNING : 461 CAN_ERR_CRTL_RX_WARNING; 462 } else { 463 priv->can.can_stats.error_passive++; 464 cf->data[1] = (txerr > rxerr) ? 465 CAN_ERR_CRTL_TX_PASSIVE : 466 CAN_ERR_CRTL_RX_PASSIVE; 467 } 468 cf->data[6] = txerr; 469 cf->data[7] = rxerr; 470 } 471 472 priv->can.state = state; 473 474 netif_rx(skb); 475 476 stats->rx_packets++; 477 stats->rx_bytes += cf->can_dlc; 478 479 return 0; 480 } 481 482 irqreturn_t sja1000_interrupt(int irq, void *dev_id) 483 { 484 struct net_device *dev = (struct net_device *)dev_id; 485 struct sja1000_priv *priv = netdev_priv(dev); 486 struct net_device_stats *stats = &dev->stats; 487 uint8_t isrc, status; 488 int n = 0; 489 490 /* Shared interrupts and IRQ off? */ 491 if (priv->read_reg(priv, REG_IER) == IRQ_OFF) 492 return IRQ_NONE; 493 494 if (priv->pre_irq) 495 priv->pre_irq(priv); 496 497 while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) { 498 n++; 499 status = priv->read_reg(priv, REG_SR); 500 /* check for absent controller due to hw unplug */ 501 if (status == 0xFF && sja1000_is_absent(priv)) 502 return IRQ_NONE; 503 504 if (isrc & IRQ_WUI) 505 netdev_warn(dev, "wakeup interrupt\n"); 506 507 if (isrc & IRQ_TI) { 508 /* transmission complete interrupt */ 509 stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf; 510 stats->tx_packets++; 511 can_get_echo_skb(dev, 0); 512 netif_wake_queue(dev); 513 } 514 if (isrc & IRQ_RI) { 515 /* receive interrupt */ 516 while (status & SR_RBS) { 517 sja1000_rx(dev); 518 status = priv->read_reg(priv, REG_SR); 519 /* check for absent controller */ 520 if (status == 0xFF && sja1000_is_absent(priv)) 521 return IRQ_NONE; 522 } 523 } 524 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) { 525 /* error interrupt */ 526 if (sja1000_err(dev, isrc, status)) 527 break; 528 } 529 } 530 531 if (priv->post_irq) 532 priv->post_irq(priv); 533 534 if (n >= SJA1000_MAX_IRQ) 535 netdev_dbg(dev, "%d messages handled in ISR", n); 536 537 return (n) ? IRQ_HANDLED : IRQ_NONE; 538 } 539 EXPORT_SYMBOL_GPL(sja1000_interrupt); 540 541 static int sja1000_open(struct net_device *dev) 542 { 543 struct sja1000_priv *priv = netdev_priv(dev); 544 int err; 545 546 /* set chip into reset mode */ 547 set_reset_mode(dev); 548 549 /* common open */ 550 err = open_candev(dev); 551 if (err) 552 return err; 553 554 /* register interrupt handler, if not done by the device driver */ 555 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) { 556 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags, 557 dev->name, (void *)dev); 558 if (err) { 559 close_candev(dev); 560 return -EAGAIN; 561 } 562 } 563 564 /* init and start chi */ 565 sja1000_start(dev); 566 priv->open_time = jiffies; 567 568 netif_start_queue(dev); 569 570 return 0; 571 } 572 573 static int sja1000_close(struct net_device *dev) 574 { 575 struct sja1000_priv *priv = netdev_priv(dev); 576 577 netif_stop_queue(dev); 578 set_reset_mode(dev); 579 580 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) 581 free_irq(dev->irq, (void *)dev); 582 583 close_candev(dev); 584 585 priv->open_time = 0; 586 587 return 0; 588 } 589 590 struct net_device *alloc_sja1000dev(int sizeof_priv) 591 { 592 struct net_device *dev; 593 struct sja1000_priv *priv; 594 595 dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv, 596 SJA1000_ECHO_SKB_MAX); 597 if (!dev) 598 return NULL; 599 600 priv = netdev_priv(dev); 601 602 priv->dev = dev; 603 priv->can.bittiming_const = &sja1000_bittiming_const; 604 priv->can.do_set_bittiming = sja1000_set_bittiming; 605 priv->can.do_set_mode = sja1000_set_mode; 606 priv->can.do_get_berr_counter = sja1000_get_berr_counter; 607 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | 608 CAN_CTRLMODE_BERR_REPORTING; 609 610 spin_lock_init(&priv->cmdreg_lock); 611 612 if (sizeof_priv) 613 priv->priv = (void *)priv + sizeof(struct sja1000_priv); 614 615 return dev; 616 } 617 EXPORT_SYMBOL_GPL(alloc_sja1000dev); 618 619 void free_sja1000dev(struct net_device *dev) 620 { 621 free_candev(dev); 622 } 623 EXPORT_SYMBOL_GPL(free_sja1000dev); 624 625 static const struct net_device_ops sja1000_netdev_ops = { 626 .ndo_open = sja1000_open, 627 .ndo_stop = sja1000_close, 628 .ndo_start_xmit = sja1000_start_xmit, 629 }; 630 631 int register_sja1000dev(struct net_device *dev) 632 { 633 if (!sja1000_probe_chip(dev)) 634 return -ENODEV; 635 636 dev->flags |= IFF_ECHO; /* we support local echo */ 637 dev->netdev_ops = &sja1000_netdev_ops; 638 639 set_reset_mode(dev); 640 chipset_init(dev); 641 642 return register_candev(dev); 643 } 644 EXPORT_SYMBOL_GPL(register_sja1000dev); 645 646 void unregister_sja1000dev(struct net_device *dev) 647 { 648 set_reset_mode(dev); 649 unregister_candev(dev); 650 } 651 EXPORT_SYMBOL_GPL(unregister_sja1000dev); 652 653 static __init int sja1000_init(void) 654 { 655 printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME); 656 657 return 0; 658 } 659 660 module_init(sja1000_init); 661 662 static __exit void sja1000_exit(void) 663 { 664 printk(KERN_INFO "%s: driver removed\n", DRV_NAME); 665 } 666 667 module_exit(sja1000_exit); 668