sja1000.c revision a7762b10c12a70c5dbf2253142764b728ac88c3a
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 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 dev_err(dev->dev.parent, "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 priv->write_reg(priv, REG_MOD, 0x00); 160 udelay(10); 161 status = priv->read_reg(priv, REG_MOD); 162 } 163 164 dev_err(dev->dev.parent, "setting SJA1000 into normal mode failed!\n"); 165} 166 167static 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 184static 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 205static 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 dev_info(dev->dev.parent, 218 "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); 219 220 priv->write_reg(priv, REG_BTR0, btr0); 221 priv->write_reg(priv, REG_BTR1, btr1); 222 223 return 0; 224} 225 226static int sja1000_get_berr_counter(const struct net_device *dev, 227 struct can_berr_counter *bec) 228{ 229 struct sja1000_priv *priv = netdev_priv(dev); 230 231 bec->txerr = priv->read_reg(priv, REG_TXERR); 232 bec->rxerr = priv->read_reg(priv, REG_RXERR); 233 234 return 0; 235} 236 237/* 238 * initialize SJA1000 chip: 239 * - reset chip 240 * - set output mode 241 * - set baudrate 242 * - enable interrupts 243 * - start operating mode 244 */ 245static void chipset_init(struct net_device *dev) 246{ 247 struct sja1000_priv *priv = netdev_priv(dev); 248 249 /* set clock divider and output control register */ 250 priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN); 251 252 /* set acceptance filter (accept all) */ 253 priv->write_reg(priv, REG_ACCC0, 0x00); 254 priv->write_reg(priv, REG_ACCC1, 0x00); 255 priv->write_reg(priv, REG_ACCC2, 0x00); 256 priv->write_reg(priv, REG_ACCC3, 0x00); 257 258 priv->write_reg(priv, REG_ACCM0, 0xFF); 259 priv->write_reg(priv, REG_ACCM1, 0xFF); 260 priv->write_reg(priv, REG_ACCM2, 0xFF); 261 priv->write_reg(priv, REG_ACCM3, 0xFF); 262 263 priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL); 264} 265 266/* 267 * transmit a CAN message 268 * message layout in the sk_buff should be like this: 269 * xx xx xx xx ff ll 00 11 22 33 44 55 66 77 270 * [ can-id ] [flags] [len] [can data (up to 8 bytes] 271 */ 272static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb, 273 struct net_device *dev) 274{ 275 struct sja1000_priv *priv = netdev_priv(dev); 276 struct can_frame *cf = (struct can_frame *)skb->data; 277 uint8_t fi; 278 uint8_t dlc; 279 canid_t id; 280 uint8_t dreg; 281 int i; 282 283 if (can_dropped_invalid_skb(dev, skb)) 284 return NETDEV_TX_OK; 285 286 netif_stop_queue(dev); 287 288 fi = dlc = cf->can_dlc; 289 id = cf->can_id; 290 291 if (id & CAN_RTR_FLAG) 292 fi |= FI_RTR; 293 294 if (id & CAN_EFF_FLAG) { 295 fi |= FI_FF; 296 dreg = EFF_BUF; 297 priv->write_reg(priv, REG_FI, fi); 298 priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16)); 299 priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8)); 300 priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5); 301 priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3); 302 } else { 303 dreg = SFF_BUF; 304 priv->write_reg(priv, REG_FI, fi); 305 priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3); 306 priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5); 307 } 308 309 for (i = 0; i < dlc; i++) 310 priv->write_reg(priv, dreg++, cf->data[i]); 311 312 can_put_echo_skb(skb, dev, 0); 313 314 sja1000_write_cmdreg(priv, CMD_TR); 315 316 return NETDEV_TX_OK; 317} 318 319static void sja1000_rx(struct net_device *dev) 320{ 321 struct sja1000_priv *priv = netdev_priv(dev); 322 struct net_device_stats *stats = &dev->stats; 323 struct can_frame *cf; 324 struct sk_buff *skb; 325 uint8_t fi; 326 uint8_t dreg; 327 canid_t id; 328 int i; 329 330 /* create zero'ed CAN frame buffer */ 331 skb = alloc_can_skb(dev, &cf); 332 if (skb == NULL) 333 return; 334 335 fi = priv->read_reg(priv, REG_FI); 336 337 if (fi & FI_FF) { 338 /* extended frame format (EFF) */ 339 dreg = EFF_BUF; 340 id = (priv->read_reg(priv, REG_ID1) << (5 + 16)) 341 | (priv->read_reg(priv, REG_ID2) << (5 + 8)) 342 | (priv->read_reg(priv, REG_ID3) << 5) 343 | (priv->read_reg(priv, REG_ID4) >> 3); 344 id |= CAN_EFF_FLAG; 345 } else { 346 /* standard frame format (SFF) */ 347 dreg = SFF_BUF; 348 id = (priv->read_reg(priv, REG_ID1) << 3) 349 | (priv->read_reg(priv, REG_ID2) >> 5); 350 } 351 352 cf->can_dlc = get_can_dlc(fi & 0x0F); 353 if (fi & FI_RTR) { 354 id |= CAN_RTR_FLAG; 355 } else { 356 for (i = 0; i < cf->can_dlc; i++) 357 cf->data[i] = priv->read_reg(priv, dreg++); 358 } 359 360 cf->can_id = id; 361 362 /* release receive buffer */ 363 sja1000_write_cmdreg(priv, CMD_RRB); 364 365 netif_rx(skb); 366 367 stats->rx_packets++; 368 stats->rx_bytes += cf->can_dlc; 369} 370 371static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) 372{ 373 struct sja1000_priv *priv = netdev_priv(dev); 374 struct net_device_stats *stats = &dev->stats; 375 struct can_frame *cf; 376 struct sk_buff *skb; 377 enum can_state state = priv->can.state; 378 uint8_t ecc, alc; 379 380 skb = alloc_can_err_skb(dev, &cf); 381 if (skb == NULL) 382 return -ENOMEM; 383 384 if (isrc & IRQ_DOI) { 385 /* data overrun interrupt */ 386 dev_dbg(dev->dev.parent, "data overrun interrupt\n"); 387 cf->can_id |= CAN_ERR_CRTL; 388 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; 389 stats->rx_over_errors++; 390 stats->rx_errors++; 391 sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */ 392 } 393 394 if (isrc & IRQ_EI) { 395 /* error warning interrupt */ 396 dev_dbg(dev->dev.parent, "error warning interrupt\n"); 397 398 if (status & SR_BS) { 399 state = CAN_STATE_BUS_OFF; 400 cf->can_id |= CAN_ERR_BUSOFF; 401 can_bus_off(dev); 402 } else if (status & SR_ES) { 403 state = CAN_STATE_ERROR_WARNING; 404 } else 405 state = CAN_STATE_ERROR_ACTIVE; 406 } 407 if (isrc & IRQ_BEI) { 408 /* bus error interrupt */ 409 priv->can.can_stats.bus_error++; 410 stats->rx_errors++; 411 412 ecc = priv->read_reg(priv, REG_ECC); 413 414 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 415 416 switch (ecc & ECC_MASK) { 417 case ECC_BIT: 418 cf->data[2] |= CAN_ERR_PROT_BIT; 419 break; 420 case ECC_FORM: 421 cf->data[2] |= CAN_ERR_PROT_FORM; 422 break; 423 case ECC_STUFF: 424 cf->data[2] |= CAN_ERR_PROT_STUFF; 425 break; 426 default: 427 cf->data[2] |= CAN_ERR_PROT_UNSPEC; 428 cf->data[3] = ecc & ECC_SEG; 429 break; 430 } 431 /* Error occurred during transmission? */ 432 if ((ecc & ECC_DIR) == 0) 433 cf->data[2] |= CAN_ERR_PROT_TX; 434 } 435 if (isrc & IRQ_EPI) { 436 /* error passive interrupt */ 437 dev_dbg(dev->dev.parent, "error passive interrupt\n"); 438 if (status & SR_ES) 439 state = CAN_STATE_ERROR_PASSIVE; 440 else 441 state = CAN_STATE_ERROR_ACTIVE; 442 } 443 if (isrc & IRQ_ALI) { 444 /* arbitration lost interrupt */ 445 dev_dbg(dev->dev.parent, "arbitration lost interrupt\n"); 446 alc = priv->read_reg(priv, REG_ALC); 447 priv->can.can_stats.arbitration_lost++; 448 stats->tx_errors++; 449 cf->can_id |= CAN_ERR_LOSTARB; 450 cf->data[0] = alc & 0x1f; 451 } 452 453 if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING || 454 state == CAN_STATE_ERROR_PASSIVE)) { 455 uint8_t rxerr = priv->read_reg(priv, REG_RXERR); 456 uint8_t txerr = priv->read_reg(priv, REG_TXERR); 457 cf->can_id |= CAN_ERR_CRTL; 458 if (state == CAN_STATE_ERROR_WARNING) { 459 priv->can.can_stats.error_warning++; 460 cf->data[1] = (txerr > rxerr) ? 461 CAN_ERR_CRTL_TX_WARNING : 462 CAN_ERR_CRTL_RX_WARNING; 463 } else { 464 priv->can.can_stats.error_passive++; 465 cf->data[1] = (txerr > rxerr) ? 466 CAN_ERR_CRTL_TX_PASSIVE : 467 CAN_ERR_CRTL_RX_PASSIVE; 468 } 469 cf->data[6] = txerr; 470 cf->data[7] = rxerr; 471 } 472 473 priv->can.state = state; 474 475 netif_rx(skb); 476 477 stats->rx_packets++; 478 stats->rx_bytes += cf->can_dlc; 479 480 return 0; 481} 482 483irqreturn_t sja1000_interrupt(int irq, void *dev_id) 484{ 485 struct net_device *dev = (struct net_device *)dev_id; 486 struct sja1000_priv *priv = netdev_priv(dev); 487 struct net_device_stats *stats = &dev->stats; 488 uint8_t isrc, status; 489 int n = 0; 490 491 /* Shared interrupts and IRQ off? */ 492 if (priv->read_reg(priv, REG_IER) == IRQ_OFF) 493 return IRQ_NONE; 494 495 if (priv->pre_irq) 496 priv->pre_irq(priv); 497 498 while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) { 499 n++; 500 status = priv->read_reg(priv, REG_SR); 501 /* check for absent controller due to hw unplug */ 502 if (status == 0xFF && sja1000_is_absent(priv)) 503 return IRQ_NONE; 504 505 if (isrc & IRQ_WUI) 506 dev_warn(dev->dev.parent, "wakeup interrupt\n"); 507 508 if (isrc & IRQ_TI) { 509 /* transmission complete interrupt */ 510 stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf; 511 stats->tx_packets++; 512 can_get_echo_skb(dev, 0); 513 netif_wake_queue(dev); 514 } 515 if (isrc & IRQ_RI) { 516 /* receive interrupt */ 517 while (status & SR_RBS) { 518 sja1000_rx(dev); 519 status = priv->read_reg(priv, REG_SR); 520 /* check for absent controller */ 521 if (status == 0xFF && sja1000_is_absent(priv)) 522 return IRQ_NONE; 523 } 524 } 525 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) { 526 /* error interrupt */ 527 if (sja1000_err(dev, isrc, status)) 528 break; 529 } 530 } 531 532 if (priv->post_irq) 533 priv->post_irq(priv); 534 535 if (n >= SJA1000_MAX_IRQ) 536 dev_dbg(dev->dev.parent, "%d messages handled in ISR", n); 537 538 return (n) ? IRQ_HANDLED : IRQ_NONE; 539} 540EXPORT_SYMBOL_GPL(sja1000_interrupt); 541 542static int sja1000_open(struct net_device *dev) 543{ 544 struct sja1000_priv *priv = netdev_priv(dev); 545 int err; 546 547 /* set chip into reset mode */ 548 set_reset_mode(dev); 549 550 /* common open */ 551 err = open_candev(dev); 552 if (err) 553 return err; 554 555 /* register interrupt handler, if not done by the device driver */ 556 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) { 557 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags, 558 dev->name, (void *)dev); 559 if (err) { 560 close_candev(dev); 561 return -EAGAIN; 562 } 563 } 564 565 /* init and start chi */ 566 sja1000_start(dev); 567 priv->open_time = jiffies; 568 569 netif_start_queue(dev); 570 571 return 0; 572} 573 574static int sja1000_close(struct net_device *dev) 575{ 576 struct sja1000_priv *priv = netdev_priv(dev); 577 578 netif_stop_queue(dev); 579 set_reset_mode(dev); 580 581 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) 582 free_irq(dev->irq, (void *)dev); 583 584 close_candev(dev); 585 586 priv->open_time = 0; 587 588 return 0; 589} 590 591struct net_device *alloc_sja1000dev(int sizeof_priv) 592{ 593 struct net_device *dev; 594 struct sja1000_priv *priv; 595 596 dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv, 597 SJA1000_ECHO_SKB_MAX); 598 if (!dev) 599 return NULL; 600 601 priv = netdev_priv(dev); 602 603 priv->dev = dev; 604 priv->can.bittiming_const = &sja1000_bittiming_const; 605 priv->can.do_set_bittiming = sja1000_set_bittiming; 606 priv->can.do_set_mode = sja1000_set_mode; 607 priv->can.do_get_berr_counter = sja1000_get_berr_counter; 608 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | 609 CAN_CTRLMODE_BERR_REPORTING; 610 611 spin_lock_init(&priv->cmdreg_lock); 612 613 if (sizeof_priv) 614 priv->priv = (void *)priv + sizeof(struct sja1000_priv); 615 616 return dev; 617} 618EXPORT_SYMBOL_GPL(alloc_sja1000dev); 619 620void free_sja1000dev(struct net_device *dev) 621{ 622 free_candev(dev); 623} 624EXPORT_SYMBOL_GPL(free_sja1000dev); 625 626static const struct net_device_ops sja1000_netdev_ops = { 627 .ndo_open = sja1000_open, 628 .ndo_stop = sja1000_close, 629 .ndo_start_xmit = sja1000_start_xmit, 630}; 631 632int register_sja1000dev(struct net_device *dev) 633{ 634 if (!sja1000_probe_chip(dev)) 635 return -ENODEV; 636 637 dev->flags |= IFF_ECHO; /* we support local echo */ 638 dev->netdev_ops = &sja1000_netdev_ops; 639 640 set_reset_mode(dev); 641 chipset_init(dev); 642 643 return register_candev(dev); 644} 645EXPORT_SYMBOL_GPL(register_sja1000dev); 646 647void unregister_sja1000dev(struct net_device *dev) 648{ 649 set_reset_mode(dev); 650 unregister_candev(dev); 651} 652EXPORT_SYMBOL_GPL(unregister_sja1000dev); 653 654static __init int sja1000_init(void) 655{ 656 printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME); 657 658 return 0; 659} 660 661module_init(sja1000_init); 662 663static __exit void sja1000_exit(void) 664{ 665 printk(KERN_INFO "%s: driver removed\n", DRV_NAME); 666} 667 668module_exit(sja1000_exit); 669