drivers/net/can/sja1000/sja1000.c

   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 #include <linux/can/dev.h>
  67
  68 #include "sja1000.h"
  69
  70 #define DRV_NAME "sja1000"
  71
  72 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
  73 MODULE_LICENSE("Dual BSD/GPL");
  74 MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
  75
  76 static struct can_bittiming_const sja1000_bittiming_const = {
  77         .name = DRV_NAME,
  78         .tseg1_min = 1,
  79         .tseg1_max = 16,
  80         .tseg2_min = 1,
  81         .tseg2_max = 8,
  82         .sjw_max = 4,
  83         .brp_min = 1,
  84         .brp_max = 64,
  85         .brp_inc = 1,
  86 };
  87
  88 static int sja1000_probe_chip(struct net_device *dev)
  89 {
  90         struct sja1000_priv *priv = netdev_priv(dev);
  91
  92         if (priv->reg_base && (priv->read_reg(priv, 0) == 0xFF)) {
  93                 printk(KERN_INFO "%s: probing @0x%lX failed\n",
  94                        DRV_NAME, dev->base_addr);
  95                 return 0;
  96         }
  97         return -1;
  98 }
  99
 100 static void set_reset_mode(struct net_device *dev)
 101 {
 102         struct sja1000_priv *priv = netdev_priv(dev);
 103         unsigned char status = priv->read_reg(priv, REG_MOD);
 104         int i;
 105
 106         /* disable interrupts */
 107         priv->write_reg(priv, REG_IER, IRQ_OFF);
 108
 109         for (i = 0; i < 100; i++) {
 110                 /* check reset bit */
 111                 if (status & MOD_RM) {
 112                         priv->can.state = CAN_STATE_STOPPED;
 113                         return;
 114                 }
 115
 116                 priv->write_reg(priv, REG_MOD, MOD_RM); /* reset chip */
 117                 udelay(10);
 118                 status = priv->read_reg(priv, REG_MOD);
 119         }
 120
 121         dev_err(dev->dev.parent, "setting SJA1000 into reset mode failed!\n");
 122 }
 123
 124 static void set_normal_mode(struct net_device *dev)
 125 {
 126         struct sja1000_priv *priv = netdev_priv(dev);
 127         unsigned char status = priv->read_reg(priv, REG_MOD);
 128         int i;
 129
 130         for (i = 0; i < 100; i++) {
 131                 /* check reset bit */
 132                 if ((status & MOD_RM) == 0) {
 133                         priv->can.state = CAN_STATE_ERROR_ACTIVE;
 134                         /* enable all interrupts */
 135                         priv->write_reg(priv, REG_IER, IRQ_ALL);
 136                         return;
 137                 }
 138
 139                 /* set chip to normal mode */
 140                 priv->write_reg(priv, REG_MOD, 0x00);
 141                 udelay(10);
 142                 status = priv->read_reg(priv, REG_MOD);
 143         }
 144
 145         dev_err(dev->dev.parent, "setting SJA1000 into normal mode failed!\n");
 146 }
 147
 148 static void sja1000_start(struct net_device *dev)
 149 {
 150         struct sja1000_priv *priv = netdev_priv(dev);
 151
 152         /* leave reset mode */
 153         if (priv->can.state != CAN_STATE_STOPPED)
 154                 set_reset_mode(dev);
 155
 156         /* Clear error counters and error code capture */
 157         priv->write_reg(priv, REG_TXERR, 0x0);
 158         priv->write_reg(priv, REG_RXERR, 0x0);
 159         priv->read_reg(priv, REG_ECC);
 160
 161         /* leave reset mode */
 162         set_normal_mode(dev);
 163 }
 164
 165 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
 166 {
 167         struct sja1000_priv *priv = netdev_priv(dev);
 168
 169         if (!priv->open_time)
 170                 return -EINVAL;
 171
 172         switch (mode) {
 173         case CAN_MODE_START:
 174                 sja1000_start(dev);
 175                 if (netif_queue_stopped(dev))
 176                         netif_wake_queue(dev);
 177                 break;
 178
 179         default:
 180                 return -EOPNOTSUPP;
 181         }
 182
 183         return 0;
 184 }
 185
 186 static int sja1000_set_bittiming(struct net_device *dev)
 187 {
 188         struct sja1000_priv *priv = netdev_priv(dev);
 189         struct can_bittiming *bt = &priv->can.bittiming;
 190         u8 btr0, btr1;
 191
 192         btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
 193         btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
 194                 (((bt->phase_seg2 - 1) & 0x7) << 4);
 195         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
 196                 btr1 |= 0x80;
 197
 198         dev_info(dev->dev.parent,
 199                  "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
 200
 201         priv->write_reg(priv, REG_BTR0, btr0);
 202         priv->write_reg(priv, REG_BTR1, btr1);
 203
 204         return 0;
 205 }
 206
 207 /*
 208  * initialize SJA1000 chip:
 209  *   - reset chip
 210  *   - set output mode
 211  *   - set baudrate
 212  *   - enable interrupts
 213  *   - start operating mode
 214  */
 215 static void chipset_init(struct net_device *dev)
 216 {
 217         struct sja1000_priv *priv = netdev_priv(dev);
 218
 219         /* set clock divider and output control register */
 220         priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN);
 221
 222         /* set acceptance filter (accept all) */
 223         priv->write_reg(priv, REG_ACCC0, 0x00);
 224         priv->write_reg(priv, REG_ACCC1, 0x00);
 225         priv->write_reg(priv, REG_ACCC2, 0x00);
 226         priv->write_reg(priv, REG_ACCC3, 0x00);
 227
 228         priv->write_reg(priv, REG_ACCM0, 0xFF);
 229         priv->write_reg(priv, REG_ACCM1, 0xFF);
 230         priv->write_reg(priv, REG_ACCM2, 0xFF);
 231         priv->write_reg(priv, REG_ACCM3, 0xFF);
 232
 233         priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL);
 234 }
 235
 236 /*
 237  * transmit a CAN message
 238  * message layout in the sk_buff should be like this:
 239  * xx xx xx xx   ff      ll   00 11 22 33 44 55 66 77
 240  * [  can-id ] [flags] [len] [can data (up to 8 bytes]
 241  */
 242 static int sja1000_start_xmit(struct sk_buff *skb, struct net_device *dev)
 243 {
 244         struct sja1000_priv *priv = netdev_priv(dev);
 245         struct net_device_stats *stats = &dev->stats;
 246         struct can_frame *cf = (struct can_frame *)skb->data;
 247         uint8_t fi;
 248         uint8_t dlc;
 249         canid_t id;
 250         uint8_t dreg;
 251         int i;
 252
 253         netif_stop_queue(dev);
 254
 255         fi = dlc = cf->can_dlc;
 256         id = cf->can_id;
 257
 258         if (id & CAN_RTR_FLAG)
 259                 fi |= FI_RTR;
 260
 261         if (id & CAN_EFF_FLAG) {
 262                 fi |= FI_FF;
 263                 dreg = EFF_BUF;
 264                 priv->write_reg(priv, REG_FI, fi);
 265                 priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
 266                 priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8));
 267                 priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5);
 268                 priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3);
 269         } else {
 270                 dreg = SFF_BUF;
 271                 priv->write_reg(priv, REG_FI, fi);
 272                 priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3);
 273                 priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5);
 274         }
 275
 276         for (i = 0; i < dlc; i++)
 277                 priv->write_reg(priv, dreg++, cf->data[i]);
 278
 279         stats->tx_bytes += dlc;
 280         dev->trans_start = jiffies;
 281
 282         can_put_echo_skb(skb, dev, 0);
 283
 284         priv->write_reg(priv, REG_CMR, CMD_TR);
 285
 286         return NETDEV_TX_OK;
 287 }
 288
 289 static void sja1000_rx(struct net_device *dev)
 290 {
 291         struct sja1000_priv *priv = netdev_priv(dev);
 292         struct net_device_stats *stats = &dev->stats;
 293         struct can_frame *cf;
 294         struct sk_buff *skb;
 295         uint8_t fi;
 296         uint8_t dreg;
 297         canid_t id;
 298         uint8_t dlc;
 299         int i;
 300
 301         skb = dev_alloc_skb(sizeof(struct can_frame));
 302         if (skb == NULL)
 303                 return;
 304         skb->dev = dev;
 305         skb->protocol = htons(ETH_P_CAN);
 306
 307         fi = priv->read_reg(priv, REG_FI);
 308         dlc = fi & 0x0F;
 309
 310         if (fi & FI_FF) {
 311                 /* extended frame format (EFF) */
 312                 dreg = EFF_BUF;
 313                 id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
 314                     | (priv->read_reg(priv, REG_ID2) << (5 + 8))
 315                     | (priv->read_reg(priv, REG_ID3) << 5)
 316                     | (priv->read_reg(priv, REG_ID4) >> 3);
 317                 id |= CAN_EFF_FLAG;
 318         } else {
 319                 /* standard frame format (SFF) */
 320                 dreg = SFF_BUF;
 321                 id = (priv->read_reg(priv, REG_ID1) << 3)
 322                     | (priv->read_reg(priv, REG_ID2) >> 5);
 323         }
 324
 325         if (fi & FI_RTR)
 326                 id |= CAN_RTR_FLAG;
 327
 328         cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
 329         memset(cf, 0, sizeof(struct can_frame));
 330         cf->can_id = id;
 331         cf->can_dlc = dlc;
 332         for (i = 0; i < dlc; i++)
 333                 cf->data[i] = priv->read_reg(priv, dreg++);
 334
 335         while (i < 8)
 336                 cf->data[i++] = 0;
 337
 338         /* release receive buffer */
 339         priv->write_reg(priv, REG_CMR, CMD_RRB);
 340
 341         netif_rx(skb);
 342
 343         dev->last_rx = jiffies;
 344         stats->rx_packets++;
 345         stats->rx_bytes += dlc;
 346 }
 347
 348 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 349 {
 350         struct sja1000_priv *priv = netdev_priv(dev);
 351         struct net_device_stats *stats = &dev->stats;
 352         struct can_frame *cf;
 353         struct sk_buff *skb;
 354         enum can_state state = priv->can.state;
 355         uint8_t ecc, alc;
 356
 357         skb = dev_alloc_skb(sizeof(struct can_frame));
 358         if (skb == NULL)
 359                 return -ENOMEM;
 360         skb->dev = dev;
 361         skb->protocol = htons(ETH_P_CAN);
 362         cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
 363         memset(cf, 0, sizeof(struct can_frame));
 364         cf->can_id = CAN_ERR_FLAG;
 365         cf->can_dlc = CAN_ERR_DLC;
 366
 367         if (isrc & IRQ_DOI) {
 368                 /* data overrun interrupt */
 369                 dev_dbg(dev->dev.parent, "data overrun interrupt\n");
 370                 cf->can_id |= CAN_ERR_CRTL;
 371                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 372                 stats->rx_over_errors++;
 373                 stats->rx_errors++;
 374                 priv->write_reg(priv, REG_CMR, CMD_CDO);        /* clear bit */
 375         }
 376
 377         if (isrc & IRQ_EI) {
 378                 /* error warning interrupt */
 379                 dev_dbg(dev->dev.parent, "error warning interrupt\n");
 380
 381                 if (status & SR_BS) {
 382                         state = CAN_STATE_BUS_OFF;
 383                         cf->can_id |= CAN_ERR_BUSOFF;
 384                         can_bus_off(dev);
 385                 } else if (status & SR_ES) {
 386                         state = CAN_STATE_ERROR_WARNING;
 387                 } else
 388                         state = CAN_STATE_ERROR_ACTIVE;
 389         }
 390         if (isrc & IRQ_BEI) {
 391                 /* bus error interrupt */
 392                 priv->can.can_stats.bus_error++;
 393                 stats->rx_errors++;
 394
 395                 ecc = priv->read_reg(priv, REG_ECC);
 396
 397                 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 398
 399                 switch (ecc & ECC_MASK) {
 400                 case ECC_BIT:
 401                         cf->data[2] |= CAN_ERR_PROT_BIT;
 402                         break;
 403                 case ECC_FORM:
 404                         cf->data[2] |= CAN_ERR_PROT_FORM;
 405                         break;
 406                 case ECC_STUFF:
 407                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 408                         break;
 409                 default:
 410                         cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 411                         cf->data[3] = ecc & ECC_SEG;
 412                         break;
 413                 }
 414                 /* Error occured during transmission? */
 415                 if ((ecc & ECC_DIR) == 0)
 416                         cf->data[2] |= CAN_ERR_PROT_TX;
 417         }
 418         if (isrc & IRQ_EPI) {
 419                 /* error passive interrupt */
 420                 dev_dbg(dev->dev.parent, "error passive interrupt\n");
 421                 if (status & SR_ES)
 422                         state = CAN_STATE_ERROR_PASSIVE;
 423                 else
 424                         state = CAN_STATE_ERROR_ACTIVE;
 425         }
 426         if (isrc & IRQ_ALI) {
 427                 /* arbitration lost interrupt */
 428                 dev_dbg(dev->dev.parent, "arbitration lost interrupt\n");
 429                 alc = priv->read_reg(priv, REG_ALC);
 430                 priv->can.can_stats.arbitration_lost++;
 431                 stats->rx_errors++;
 432                 cf->can_id |= CAN_ERR_LOSTARB;
 433                 cf->data[0] = alc & 0x1f;
 434         }
 435
 436         if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
 437                                          state == CAN_STATE_ERROR_PASSIVE)) {
 438                 uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
 439                 uint8_t txerr = priv->read_reg(priv, REG_TXERR);
 440                 cf->can_id |= CAN_ERR_CRTL;
 441                 if (state == CAN_STATE_ERROR_WARNING) {
 442                         priv->can.can_stats.error_warning++;
 443                         cf->data[1] = (txerr > rxerr) ?
 444                                 CAN_ERR_CRTL_TX_WARNING :
 445                                 CAN_ERR_CRTL_RX_WARNING;
 446                 } else {
 447                         priv->can.can_stats.error_passive++;
 448                         cf->data[1] = (txerr > rxerr) ?
 449                                 CAN_ERR_CRTL_TX_PASSIVE :
 450                                 CAN_ERR_CRTL_RX_PASSIVE;
 451                 }
 452         }
 453
 454         priv->can.state = state;
 455
 456         netif_rx(skb);
 457
 458         dev->last_rx = jiffies;
 459         stats->rx_packets++;
 460         stats->rx_bytes += cf->can_dlc;
 461
 462         return 0;
 463 }
 464
 465 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 466 {
 467         struct net_device *dev = (struct net_device *)dev_id;
 468         struct sja1000_priv *priv = netdev_priv(dev);
 469         struct net_device_stats *stats = &dev->stats;
 470         uint8_t isrc, status;
 471         int n = 0;
 472
 473         /* Shared interrupts and IRQ off? */
 474         if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
 475                 return IRQ_NONE;
 476
 477         if (priv->pre_irq)
 478                 priv->pre_irq(priv);
 479
 480         while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
 481                 n++;
 482                 status = priv->read_reg(priv, REG_SR);
 483
 484                 if (isrc & IRQ_WUI)
 485                         dev_warn(dev->dev.parent, "wakeup interrupt\n");
 486
 487                 if (isrc & IRQ_TI) {
 488                         /* transmission complete interrupt */
 489                         stats->tx_packets++;
 490                         can_get_echo_skb(dev, 0);
 491                         netif_wake_queue(dev);
 492                 }
 493                 if (isrc & IRQ_RI) {
 494                         /* receive interrupt */
 495                         while (status & SR_RBS) {
 496                                 sja1000_rx(dev);
 497                                 status = priv->read_reg(priv, REG_SR);
 498                         }
 499                 }
 500                 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
 501                         /* error interrupt */
 502                         if (sja1000_err(dev, isrc, status))
 503                                 break;
 504                 }
 505         }
 506
 507         if (priv->post_irq)
 508                 priv->post_irq(priv);
 509
 510         if (n >= SJA1000_MAX_IRQ)
 511                 dev_dbg(dev->dev.parent, "%d messages handled in ISR", n);
 512
 513         return (n) ? IRQ_HANDLED : IRQ_NONE;
 514 }
 515 EXPORT_SYMBOL_GPL(sja1000_interrupt);
 516
 517 static int sja1000_open(struct net_device *dev)
 518 {
 519         struct sja1000_priv *priv = netdev_priv(dev);
 520         int err;
 521
 522         /* set chip into reset mode */
 523         set_reset_mode(dev);
 524
 525         /* common open */
 526         err = open_candev(dev);
 527         if (err)
 528                 return err;
 529
 530         /* register interrupt handler, if not done by the device driver */
 531         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
 532                 err = request_irq(dev->irq, &sja1000_interrupt, priv->irq_flags,
 533                                   dev->name, (void *)dev);
 534                 if (err) {
 535                         close_candev(dev);
 536                         return -EAGAIN;
 537                 }
 538         }
 539
 540         /* init and start chi */
 541         sja1000_start(dev);
 542         priv->open_time = jiffies;
 543
 544         netif_start_queue(dev);
 545
 546         return 0;
 547 }
 548
 549 static int sja1000_close(struct net_device *dev)
 550 {
 551         struct sja1000_priv *priv = netdev_priv(dev);
 552
 553         netif_stop_queue(dev);
 554         set_reset_mode(dev);
 555
 556         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
 557                 free_irq(dev->irq, (void *)dev);
 558
 559         close_candev(dev);
 560
 561         priv->open_time = 0;
 562
 563         return 0;
 564 }
 565
 566 struct net_device *alloc_sja1000dev(int sizeof_priv)
 567 {
 568         struct net_device *dev;
 569         struct sja1000_priv *priv;
 570
 571         dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv);
 572         if (!dev)
 573                 return NULL;
 574
 575         priv = netdev_priv(dev);
 576
 577         priv->dev = dev;
 578         priv->can.bittiming_const = &sja1000_bittiming_const;
 579         priv->can.do_set_bittiming = sja1000_set_bittiming;
 580         priv->can.do_set_mode = sja1000_set_mode;
 581
 582         if (sizeof_priv)
 583                 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
 584
 585         return dev;
 586 }
 587 EXPORT_SYMBOL_GPL(alloc_sja1000dev);
 588
 589 void free_sja1000dev(struct net_device *dev)
 590 {
 591         free_candev(dev);
 592 }
 593 EXPORT_SYMBOL_GPL(free_sja1000dev);
 594
 595 static const struct net_device_ops sja1000_netdev_ops = {
 596        .ndo_open               = sja1000_open,
 597        .ndo_stop               = sja1000_close,
 598        .ndo_start_xmit         = sja1000_start_xmit,
 599 };
 600
 601 int register_sja1000dev(struct net_device *dev)
 602 {
 603         if (!sja1000_probe_chip(dev))
 604                 return -ENODEV;
 605
 606         dev->flags |= IFF_ECHO; /* we support local echo */
 607         dev->netdev_ops = &sja1000_netdev_ops;
 608
 609         set_reset_mode(dev);
 610         chipset_init(dev);
 611
 612         return register_candev(dev);
 613 }
 614 EXPORT_SYMBOL_GPL(register_sja1000dev);
 615
 616 void unregister_sja1000dev(struct net_device *dev)
 617 {
 618         set_reset_mode(dev);
 619         unregister_candev(dev);
 620 }
 621 EXPORT_SYMBOL_GPL(unregister_sja1000dev);
 622
 623 static __init int sja1000_init(void)
 624 {
 625         printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
 626
 627         return 0;
 628 }
 629
 630 module_init(sja1000_init);
 631
 632 static __exit void sja1000_exit(void)
 633 {
 634         printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
 635 }
 636
 637 module_exit(sja1000_exit);