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   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  * Send feedback to <socketcan-users@lists.berlios.de>
  44  *
  45  */
  46
  47 #include <linux/module.h>
  48 #include <linux/init.h>
  49 #include <linux/kernel.h>
  50 #include <linux/sched.h>
  51 #include <linux/types.h>
  52 #include <linux/fcntl.h>
  53 #include <linux/interrupt.h>
  54 #include <linux/ptrace.h>
  55 #include <linux/string.h>
  56 #include <linux/errno.h>
  57 #include <linux/netdevice.h>
  58 #include <linux/if_arp.h>
  59 #include <linux/if_ether.h>
  60 #include <linux/skbuff.h>
  61 #include <linux/delay.h>
  62
  63 #include <linux/can.h>
  64 #include <linux/can/dev.h>
  65 #include <linux/can/error.h>
  66
  67 #include "sja1000.h"
  68
  69 #define DRV_NAME "sja1000"
  70
  71 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
  72 MODULE_LICENSE("Dual BSD/GPL");
  73 MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
  74
  75 static struct can_bittiming_const sja1000_bittiming_const = {
  76         .name = DRV_NAME,
  77         .tseg1_min = 1,
  78         .tseg1_max = 16,
  79         .tseg2_min = 1,
  80         .tseg2_max = 8,
  81         .sjw_max = 4,
  82         .brp_min = 1,
  83         .brp_max = 64,
  84         .brp_inc = 1,
  85 };
  86
  87 static int sja1000_probe_chip(struct net_device *dev)
  88 {
  89         struct sja1000_priv *priv = netdev_priv(dev);
  90
  91         if (priv->reg_base && (priv->read_reg(priv, 0) == 0xFF)) {
  92                 printk(KERN_INFO "%s: probing @0x%lX failed\n",
  93                        DRV_NAME, dev->base_addr);
  94                 return 0;
  95         }
  96         return -1;
  97 }
  98
  99 static void set_reset_mode(struct net_device *dev)
 100 {
 101         struct sja1000_priv *priv = netdev_priv(dev);
 102         unsigned char status = priv->read_reg(priv, REG_MOD);
 103         int i;
 104
 105         /* disable interrupts */
 106         priv->write_reg(priv, REG_IER, IRQ_OFF);
 107
 108         for (i = 0; i < 100; i++) {
 109                 /* check reset bit */
 110                 if (status & MOD_RM) {
 111                         priv->can.state = CAN_STATE_STOPPED;
 112                         return;
 113                 }
 114
 115                 priv->write_reg(priv, REG_MOD, MOD_RM); /* reset chip */
 116                 udelay(10);
 117                 status = priv->read_reg(priv, REG_MOD);
 118         }
 119
 120         dev_err(dev->dev.parent, "setting SJA1000 into reset mode failed!\n");
 121 }
 122
 123 static void set_normal_mode(struct net_device *dev)
 124 {
 125         struct sja1000_priv *priv = netdev_priv(dev);
 126         unsigned char status = priv->read_reg(priv, REG_MOD);
 127         int i;
 128
 129         for (i = 0; i < 100; i++) {
 130                 /* check reset bit */
 131                 if ((status & MOD_RM) == 0) {
 132                         priv->can.state = CAN_STATE_ERROR_ACTIVE;
 133                         /* enable all interrupts */
 134                         priv->write_reg(priv, REG_IER, IRQ_ALL);
 135                         return;
 136                 }
 137
 138                 /* set chip to normal mode */
 139                 priv->write_reg(priv, REG_MOD, 0x00);
 140                 udelay(10);
 141                 status = priv->read_reg(priv, REG_MOD);
 142         }
 143
 144         dev_err(dev->dev.parent, "setting SJA1000 into normal mode failed!\n");
 145 }
 146
 147 static void sja1000_start(struct net_device *dev)
 148 {
 149         struct sja1000_priv *priv = netdev_priv(dev);
 150
 151         /* leave reset mode */
 152         if (priv->can.state != CAN_STATE_STOPPED)
 153                 set_reset_mode(dev);
 154
 155         /* Clear error counters and error code capture */
 156         priv->write_reg(priv, REG_TXERR, 0x0);
 157         priv->write_reg(priv, REG_RXERR, 0x0);
 158         priv->read_reg(priv, REG_ECC);
 159
 160         /* leave reset mode */
 161         set_normal_mode(dev);
 162 }
 163
 164 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
 165 {
 166         struct sja1000_priv *priv = netdev_priv(dev);
 167
 168         if (!priv->open_time)
 169                 return -EINVAL;
 170
 171         switch (mode) {
 172         case CAN_MODE_START:
 173                 sja1000_start(dev);
 174                 if (netif_queue_stopped(dev))
 175                         netif_wake_queue(dev);
 176                 break;
 177
 178         default:
 179                 return -EOPNOTSUPP;
 180         }
 181
 182         return 0;
 183 }
 184
 185 static int sja1000_set_bittiming(struct net_device *dev)
 186 {
 187         struct sja1000_priv *priv = netdev_priv(dev);
 188         struct can_bittiming *bt = &priv->can.bittiming;
 189         u8 btr0, btr1;
 190
 191         btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
 192         btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
 193                 (((bt->phase_seg2 - 1) & 0x7) << 4);
 194         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
 195                 btr1 |= 0x80;
 196
 197         dev_info(dev->dev.parent,
 198                  "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
 199
 200         priv->write_reg(priv, REG_BTR0, btr0);
 201         priv->write_reg(priv, REG_BTR1, btr1);
 202
 203         return 0;
 204 }
 205
 206 /*
 207  * initialize SJA1000 chip:
 208  *   - reset chip
 209  *   - set output mode
 210  *   - set baudrate
 211  *   - enable interrupts
 212  *   - start operating mode
 213  */
 214 static void chipset_init(struct net_device *dev)
 215 {
 216         struct sja1000_priv *priv = netdev_priv(dev);
 217
 218         /* set clock divider and output control register */
 219         priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN);
 220
 221         /* set acceptance filter (accept all) */
 222         priv->write_reg(priv, REG_ACCC0, 0x00);
 223         priv->write_reg(priv, REG_ACCC1, 0x00);
 224         priv->write_reg(priv, REG_ACCC2, 0x00);
 225         priv->write_reg(priv, REG_ACCC3, 0x00);
 226
 227         priv->write_reg(priv, REG_ACCM0, 0xFF);
 228         priv->write_reg(priv, REG_ACCM1, 0xFF);
 229         priv->write_reg(priv, REG_ACCM2, 0xFF);
 230         priv->write_reg(priv, REG_ACCM3, 0xFF);
 231
 232         priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL);
 233 }
 234
 235 /*
 236  * transmit a CAN message
 237  * message layout in the sk_buff should be like this:
 238  * xx xx xx xx   ff      ll   00 11 22 33 44 55 66 77
 239  * [  can-id ] [flags] [len] [can data (up to 8 bytes]
 240  */
 241 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
 242                                             struct net_device *dev)
 243 {
 244         struct sja1000_priv *priv = netdev_priv(dev);
 245         struct can_frame *cf = (struct can_frame *)skb->data;
 246         uint8_t fi;
 247         uint8_t dlc;
 248         canid_t id;
 249         uint8_t dreg;
 250         int i;
 251
 252         netif_stop_queue(dev);
 253
 254         fi = dlc = cf->can_dlc;
 255         id = cf->can_id;
 256
 257         if (id & CAN_RTR_FLAG)
 258                 fi |= FI_RTR;
 259
 260         if (id & CAN_EFF_FLAG) {
 261                 fi |= FI_FF;
 262                 dreg = EFF_BUF;
 263                 priv->write_reg(priv, REG_FI, fi);
 264                 priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
 265                 priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8));
 266                 priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5);
 267                 priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3);
 268         } else {
 269                 dreg = SFF_BUF;
 270                 priv->write_reg(priv, REG_FI, fi);
 271                 priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3);
 272                 priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5);
 273         }
 274
 275         for (i = 0; i < dlc; i++)
 276                 priv->write_reg(priv, dreg++, cf->data[i]);
 277
 278         dev->trans_start = jiffies;
 279
 280         can_put_echo_skb(skb, dev, 0);
 281
 282         priv->write_reg(priv, REG_CMR, CMD_TR);
 283
 284         return NETDEV_TX_OK;
 285 }
 286
 287 static void sja1000_rx(struct net_device *dev)
 288 {
 289         struct sja1000_priv *priv = netdev_priv(dev);
 290         struct net_device_stats *stats = &dev->stats;
 291         struct can_frame *cf;
 292         struct sk_buff *skb;
 293         uint8_t fi;
 294         uint8_t dreg;
 295         canid_t id;
 296         uint8_t dlc;
 297         int i;
 298
 299         skb = alloc_can_skb(dev, &cf);
 300         if (skb == NULL)
 301                 return;
 302
 303         fi = priv->read_reg(priv, REG_FI);
 304         dlc = fi & 0x0F;
 305
 306         if (fi & FI_FF) {
 307                 /* extended frame format (EFF) */
 308                 dreg = EFF_BUF;
 309                 id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
 310                     | (priv->read_reg(priv, REG_ID2) << (5 + 8))
 311                     | (priv->read_reg(priv, REG_ID3) << 5)
 312                     | (priv->read_reg(priv, REG_ID4) >> 3);
 313                 id |= CAN_EFF_FLAG;
 314         } else {
 315                 /* standard frame format (SFF) */
 316                 dreg = SFF_BUF;
 317                 id = (priv->read_reg(priv, REG_ID1) << 3)
 318                     | (priv->read_reg(priv, REG_ID2) >> 5);
 319         }
 320
 321         if (fi & FI_RTR)
 322                 id |= CAN_RTR_FLAG;
 323
 324         cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
 325         memset(cf, 0, sizeof(struct can_frame));
 326         cf->can_id = id;
 327         cf->can_dlc = dlc;
 328         for (i = 0; i < dlc; i++)
 329                 cf->data[i] = priv->read_reg(priv, dreg++);
 330
 331         while (i < 8)
 332                 cf->data[i++] = 0;
 333
 334         /* release receive buffer */
 335         priv->write_reg(priv, REG_CMR, CMD_RRB);
 336
 337         netif_rx(skb);
 338
 339         stats->rx_packets++;
 340         stats->rx_bytes += dlc;
 341 }
 342
 343 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 344 {
 345         struct sja1000_priv *priv = netdev_priv(dev);
 346         struct net_device_stats *stats = &dev->stats;
 347         struct can_frame *cf;
 348         struct sk_buff *skb;
 349         enum can_state state = priv->can.state;
 350         uint8_t ecc, alc;
 351
 352         skb = alloc_can_err_skb(dev, &cf);
 353         if (skb == NULL)
 354                 return -ENOMEM;
 355
 356         if (isrc & IRQ_DOI) {
 357                 /* data overrun interrupt */
 358                 dev_dbg(dev->dev.parent, "data overrun interrupt\n");
 359                 cf->can_id |= CAN_ERR_CRTL;
 360                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 361                 stats->rx_over_errors++;
 362                 stats->rx_errors++;
 363                 priv->write_reg(priv, REG_CMR, CMD_CDO);        /* clear bit */
 364         }
 365
 366         if (isrc & IRQ_EI) {
 367                 /* error warning interrupt */
 368                 dev_dbg(dev->dev.parent, "error warning interrupt\n");
 369
 370                 if (status & SR_BS) {
 371                         state = CAN_STATE_BUS_OFF;
 372                         cf->can_id |= CAN_ERR_BUSOFF;
 373                         can_bus_off(dev);
 374                 } else if (status & SR_ES) {
 375                         state = CAN_STATE_ERROR_WARNING;
 376                 } else
 377                         state = CAN_STATE_ERROR_ACTIVE;
 378         }
 379         if (isrc & IRQ_BEI) {
 380                 /* bus error interrupt */
 381                 priv->can.can_stats.bus_error++;
 382                 stats->rx_errors++;
 383
 384                 ecc = priv->read_reg(priv, REG_ECC);
 385
 386                 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 387
 388                 switch (ecc & ECC_MASK) {
 389                 case ECC_BIT:
 390                         cf->data[2] |= CAN_ERR_PROT_BIT;
 391                         break;
 392                 case ECC_FORM:
 393                         cf->data[2] |= CAN_ERR_PROT_FORM;
 394                         break;
 395                 case ECC_STUFF:
 396                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 397                         break;
 398                 default:
 399                         cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 400                         cf->data[3] = ecc & ECC_SEG;
 401                         break;
 402                 }
 403                 /* Error occured during transmission? */
 404                 if ((ecc & ECC_DIR) == 0)
 405                         cf->data[2] |= CAN_ERR_PROT_TX;
 406         }
 407         if (isrc & IRQ_EPI) {
 408                 /* error passive interrupt */
 409                 dev_dbg(dev->dev.parent, "error passive interrupt\n");
 410                 if (status & SR_ES)
 411                         state = CAN_STATE_ERROR_PASSIVE;
 412                 else
 413                         state = CAN_STATE_ERROR_ACTIVE;
 414         }
 415         if (isrc & IRQ_ALI) {
 416                 /* arbitration lost interrupt */
 417                 dev_dbg(dev->dev.parent, "arbitration lost interrupt\n");
 418                 alc = priv->read_reg(priv, REG_ALC);
 419                 priv->can.can_stats.arbitration_lost++;
 420                 stats->tx_errors++;
 421                 cf->can_id |= CAN_ERR_LOSTARB;
 422                 cf->data[0] = alc & 0x1f;
 423         }
 424
 425         if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
 426                                          state == CAN_STATE_ERROR_PASSIVE)) {
 427                 uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
 428                 uint8_t txerr = priv->read_reg(priv, REG_TXERR);
 429                 cf->can_id |= CAN_ERR_CRTL;
 430                 if (state == CAN_STATE_ERROR_WARNING) {
 431                         priv->can.can_stats.error_warning++;
 432                         cf->data[1] = (txerr > rxerr) ?
 433                                 CAN_ERR_CRTL_TX_WARNING :
 434                                 CAN_ERR_CRTL_RX_WARNING;
 435                 } else {
 436                         priv->can.can_stats.error_passive++;
 437                         cf->data[1] = (txerr > rxerr) ?
 438                                 CAN_ERR_CRTL_TX_PASSIVE :
 439                                 CAN_ERR_CRTL_RX_PASSIVE;
 440                 }
 441         }
 442
 443         priv->can.state = state;
 444
 445         netif_rx(skb);
 446
 447         stats->rx_packets++;
 448         stats->rx_bytes += cf->can_dlc;
 449
 450         return 0;
 451 }
 452
 453 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 454 {
 455         struct net_device *dev = (struct net_device *)dev_id;
 456         struct sja1000_priv *priv = netdev_priv(dev);
 457         struct net_device_stats *stats = &dev->stats;
 458         uint8_t isrc, status;
 459         int n = 0;
 460
 461         /* Shared interrupts and IRQ off? */
 462         if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
 463                 return IRQ_NONE;
 464
 465         if (priv->pre_irq)
 466                 priv->pre_irq(priv);
 467
 468         while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
 469                 n++;
 470                 status = priv->read_reg(priv, REG_SR);
 471
 472                 if (isrc & IRQ_WUI)
 473                         dev_warn(dev->dev.parent, "wakeup interrupt\n");
 474
 475                 if (isrc & IRQ_TI) {
 476                         /* transmission complete interrupt */
 477                         stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf;
 478                         stats->tx_packets++;
 479                         can_get_echo_skb(dev, 0);
 480                         netif_wake_queue(dev);
 481                 }
 482                 if (isrc & IRQ_RI) {
 483                         /* receive interrupt */
 484                         while (status & SR_RBS) {
 485                                 sja1000_rx(dev);
 486                                 status = priv->read_reg(priv, REG_SR);
 487                         }
 488                 }
 489                 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
 490                         /* error interrupt */
 491                         if (sja1000_err(dev, isrc, status))
 492                                 break;
 493                 }
 494         }
 495
 496         if (priv->post_irq)
 497                 priv->post_irq(priv);
 498
 499         if (n >= SJA1000_MAX_IRQ)
 500                 dev_dbg(dev->dev.parent, "%d messages handled in ISR", n);
 501
 502         return (n) ? IRQ_HANDLED : IRQ_NONE;
 503 }
 504 EXPORT_SYMBOL_GPL(sja1000_interrupt);
 505
 506 static int sja1000_open(struct net_device *dev)
 507 {
 508         struct sja1000_priv *priv = netdev_priv(dev);
 509         int err;
 510
 511         /* set chip into reset mode */
 512         set_reset_mode(dev);
 513
 514         /* common open */
 515         err = open_candev(dev);
 516         if (err)
 517                 return err;
 518
 519         /* register interrupt handler, if not done by the device driver */
 520         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
 521                 err = request_irq(dev->irq, &sja1000_interrupt, priv->irq_flags,
 522                                   dev->name, (void *)dev);
 523                 if (err) {
 524                         close_candev(dev);
 525                         return -EAGAIN;
 526                 }
 527         }
 528
 529         /* init and start chi */
 530         sja1000_start(dev);
 531         priv->open_time = jiffies;
 532
 533         netif_start_queue(dev);
 534
 535         return 0;
 536 }
 537
 538 static int sja1000_close(struct net_device *dev)
 539 {
 540         struct sja1000_priv *priv = netdev_priv(dev);
 541
 542         netif_stop_queue(dev);
 543         set_reset_mode(dev);
 544
 545         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
 546                 free_irq(dev->irq, (void *)dev);
 547
 548         close_candev(dev);
 549
 550         priv->open_time = 0;
 551
 552         return 0;
 553 }
 554
 555 struct net_device *alloc_sja1000dev(int sizeof_priv)
 556 {
 557         struct net_device *dev;
 558         struct sja1000_priv *priv;
 559
 560         dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
 561                 SJA1000_ECHO_SKB_MAX);
 562         if (!dev)
 563                 return NULL;
 564
 565         priv = netdev_priv(dev);
 566
 567         priv->dev = dev;
 568         priv->can.bittiming_const = &sja1000_bittiming_const;
 569         priv->can.do_set_bittiming = sja1000_set_bittiming;
 570         priv->can.do_set_mode = sja1000_set_mode;
 571
 572         if (sizeof_priv)
 573                 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
 574
 575         return dev;
 576 }
 577 EXPORT_SYMBOL_GPL(alloc_sja1000dev);
 578
 579 void free_sja1000dev(struct net_device *dev)
 580 {
 581         free_candev(dev);
 582 }
 583 EXPORT_SYMBOL_GPL(free_sja1000dev);
 584
 585 static const struct net_device_ops sja1000_netdev_ops = {
 586        .ndo_open               = sja1000_open,
 587        .ndo_stop               = sja1000_close,
 588        .ndo_start_xmit         = sja1000_start_xmit,
 589 };
 590
 591 int register_sja1000dev(struct net_device *dev)
 592 {
 593         if (!sja1000_probe_chip(dev))
 594                 return -ENODEV;
 595
 596         dev->flags |= IFF_ECHO; /* we support local echo */
 597         dev->netdev_ops = &sja1000_netdev_ops;
 598
 599         set_reset_mode(dev);
 600         chipset_init(dev);
 601
 602         return register_candev(dev);
 603 }
 604 EXPORT_SYMBOL_GPL(register_sja1000dev);
 605
 606 void unregister_sja1000dev(struct net_device *dev)
 607 {
 608         set_reset_mode(dev);
 609         unregister_candev(dev);
 610 }
 611 EXPORT_SYMBOL_GPL(unregister_sja1000dev);
 612
 613 static __init int sja1000_init(void)
 614 {
 615         printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
 616
 617         return 0;
 618 }
 619
 620 module_init(sja1000_init);
 621
 622 static __exit void sja1000_exit(void)
 623 {
 624         printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
 625 }
 626
 627 module_exit(sja1000_exit);