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
  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 interrupts */
 134                         if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
 135                                 priv->write_reg(priv, REG_IER, IRQ_ALL);
 136                         else
 137                                 priv->write_reg(priv, REG_IER,
 138                                                 IRQ_ALL & ~IRQ_BEI);
 139                         return;
 140                 }
 141
 142                 /* set chip to normal mode */
 143                 priv->write_reg(priv, REG_MOD, 0x00);
 144                 udelay(10);
 145                 status = priv->read_reg(priv, REG_MOD);
 146         }
 147
 148         dev_err(dev->dev.parent, "setting SJA1000 into normal mode failed!\n");
 149 }
 150
 151 static void sja1000_start(struct net_device *dev)
 152 {
 153         struct sja1000_priv *priv = netdev_priv(dev);
 154
 155         /* leave reset mode */
 156         if (priv->can.state != CAN_STATE_STOPPED)
 157                 set_reset_mode(dev);
 158
 159         /* Clear error counters and error code capture */
 160         priv->write_reg(priv, REG_TXERR, 0x0);
 161         priv->write_reg(priv, REG_RXERR, 0x0);
 162         priv->read_reg(priv, REG_ECC);
 163
 164         /* leave reset mode */
 165         set_normal_mode(dev);
 166 }
 167
 168 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
 169 {
 170         struct sja1000_priv *priv = netdev_priv(dev);
 171
 172         if (!priv->open_time)
 173                 return -EINVAL;
 174
 175         switch (mode) {
 176         case CAN_MODE_START:
 177                 sja1000_start(dev);
 178                 if (netif_queue_stopped(dev))
 179                         netif_wake_queue(dev);
 180                 break;
 181
 182         default:
 183                 return -EOPNOTSUPP;
 184         }
 185
 186         return 0;
 187 }
 188
 189 static int sja1000_set_bittiming(struct net_device *dev)
 190 {
 191         struct sja1000_priv *priv = netdev_priv(dev);
 192         struct can_bittiming *bt = &priv->can.bittiming;
 193         u8 btr0, btr1;
 194
 195         btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
 196         btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
 197                 (((bt->phase_seg2 - 1) & 0x7) << 4);
 198         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
 199                 btr1 |= 0x80;
 200
 201         dev_info(dev->dev.parent,
 202                  "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
 203
 204         priv->write_reg(priv, REG_BTR0, btr0);
 205         priv->write_reg(priv, REG_BTR1, btr1);
 206
 207         return 0;
 208 }
 209
 210 static int sja1000_get_berr_counter(const struct net_device *dev,
 211                                     struct can_berr_counter *bec)
 212 {
 213         struct sja1000_priv *priv = netdev_priv(dev);
 214
 215         bec->txerr = priv->read_reg(priv, REG_TXERR);
 216         bec->rxerr = priv->read_reg(priv, REG_RXERR);
 217
 218         return 0;
 219 }
 220
 221 /*
 222  * initialize SJA1000 chip:
 223  *   - reset chip
 224  *   - set output mode
 225  *   - set baudrate
 226  *   - enable interrupts
 227  *   - start operating mode
 228  */
 229 static void chipset_init(struct net_device *dev)
 230 {
 231         struct sja1000_priv *priv = netdev_priv(dev);
 232
 233         /* set clock divider and output control register */
 234         priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN);
 235
 236         /* set acceptance filter (accept all) */
 237         priv->write_reg(priv, REG_ACCC0, 0x00);
 238         priv->write_reg(priv, REG_ACCC1, 0x00);
 239         priv->write_reg(priv, REG_ACCC2, 0x00);
 240         priv->write_reg(priv, REG_ACCC3, 0x00);
 241
 242         priv->write_reg(priv, REG_ACCM0, 0xFF);
 243         priv->write_reg(priv, REG_ACCM1, 0xFF);
 244         priv->write_reg(priv, REG_ACCM2, 0xFF);
 245         priv->write_reg(priv, REG_ACCM3, 0xFF);
 246
 247         priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL);
 248 }
 249
 250 /*
 251  * transmit a CAN message
 252  * message layout in the sk_buff should be like this:
 253  * xx xx xx xx   ff      ll   00 11 22 33 44 55 66 77
 254  * [  can-id ] [flags] [len] [can data (up to 8 bytes]
 255  */
 256 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
 257                                             struct net_device *dev)
 258 {
 259         struct sja1000_priv *priv = netdev_priv(dev);
 260         struct can_frame *cf = (struct can_frame *)skb->data;
 261         uint8_t fi;
 262         uint8_t dlc;
 263         canid_t id;
 264         uint8_t dreg;
 265         int i;
 266
 267         if (can_dropped_invalid_skb(dev, skb))
 268                 return NETDEV_TX_OK;
 269
 270         netif_stop_queue(dev);
 271
 272         fi = dlc = cf->can_dlc;
 273         id = cf->can_id;
 274
 275         if (id & CAN_RTR_FLAG)
 276                 fi |= FI_RTR;
 277
 278         if (id & CAN_EFF_FLAG) {
 279                 fi |= FI_FF;
 280                 dreg = EFF_BUF;
 281                 priv->write_reg(priv, REG_FI, fi);
 282                 priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
 283                 priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8));
 284                 priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5);
 285                 priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3);
 286         } else {
 287                 dreg = SFF_BUF;
 288                 priv->write_reg(priv, REG_FI, fi);
 289                 priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3);
 290                 priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5);
 291         }
 292
 293         for (i = 0; i < dlc; i++)
 294                 priv->write_reg(priv, dreg++, cf->data[i]);
 295
 296         dev->trans_start = jiffies;
 297
 298         can_put_echo_skb(skb, dev, 0);
 299
 300         priv->write_reg(priv, REG_CMR, CMD_TR);
 301
 302         return NETDEV_TX_OK;
 303 }
 304
 305 static void sja1000_rx(struct net_device *dev)
 306 {
 307         struct sja1000_priv *priv = netdev_priv(dev);
 308         struct net_device_stats *stats = &dev->stats;
 309         struct can_frame *cf;
 310         struct sk_buff *skb;
 311         uint8_t fi;
 312         uint8_t dreg;
 313         canid_t id;
 314         int i;
 315
 316         /* create zero'ed CAN frame buffer */
 317         skb = alloc_can_skb(dev, &cf);
 318         if (skb == NULL)
 319                 return;
 320
 321         fi = priv->read_reg(priv, REG_FI);
 322
 323         if (fi & FI_FF) {
 324                 /* extended frame format (EFF) */
 325                 dreg = EFF_BUF;
 326                 id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
 327                     | (priv->read_reg(priv, REG_ID2) << (5 + 8))
 328                     | (priv->read_reg(priv, REG_ID3) << 5)
 329                     | (priv->read_reg(priv, REG_ID4) >> 3);
 330                 id |= CAN_EFF_FLAG;
 331         } else {
 332                 /* standard frame format (SFF) */
 333                 dreg = SFF_BUF;
 334                 id = (priv->read_reg(priv, REG_ID1) << 3)
 335                     | (priv->read_reg(priv, REG_ID2) >> 5);
 336         }
 337
 338         if (fi & FI_RTR) {
 339                 id |= CAN_RTR_FLAG;
 340         } else {
 341                 cf->can_dlc = get_can_dlc(fi & 0x0F);
 342                 for (i = 0; i < cf->can_dlc; i++)
 343                         cf->data[i] = priv->read_reg(priv, dreg++);
 344         }
 345
 346         cf->can_id = id;
 347
 348         /* release receive buffer */
 349         priv->write_reg(priv, REG_CMR, CMD_RRB);
 350
 351         netif_rx(skb);
 352
 353         stats->rx_packets++;
 354         stats->rx_bytes += cf->can_dlc;
 355 }
 356
 357 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 358 {
 359         struct sja1000_priv *priv = netdev_priv(dev);
 360         struct net_device_stats *stats = &dev->stats;
 361         struct can_frame *cf;
 362         struct sk_buff *skb;
 363         enum can_state state = priv->can.state;
 364         uint8_t ecc, alc;
 365
 366         skb = alloc_can_err_skb(dev, &cf);
 367         if (skb == NULL)
 368                 return -ENOMEM;
 369
 370         if (isrc & IRQ_DOI) {
 371                 /* data overrun interrupt */
 372                 dev_dbg(dev->dev.parent, "data overrun interrupt\n");
 373                 cf->can_id |= CAN_ERR_CRTL;
 374                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 375                 stats->rx_over_errors++;
 376                 stats->rx_errors++;
 377                 priv->write_reg(priv, REG_CMR, CMD_CDO);        /* clear bit */
 378         }
 379
 380         if (isrc & IRQ_EI) {
 381                 /* error warning interrupt */
 382                 dev_dbg(dev->dev.parent, "error warning interrupt\n");
 383
 384                 if (status & SR_BS) {
 385                         state = CAN_STATE_BUS_OFF;
 386                         cf->can_id |= CAN_ERR_BUSOFF;
 387                         can_bus_off(dev);
 388                 } else if (status & SR_ES) {
 389                         state = CAN_STATE_ERROR_WARNING;
 390                 } else
 391                         state = CAN_STATE_ERROR_ACTIVE;
 392         }
 393         if (isrc & IRQ_BEI) {
 394                 /* bus error interrupt */
 395                 priv->can.can_stats.bus_error++;
 396                 stats->rx_errors++;
 397
 398                 ecc = priv->read_reg(priv, REG_ECC);
 399
 400                 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 401
 402                 switch (ecc & ECC_MASK) {
 403                 case ECC_BIT:
 404                         cf->data[2] |= CAN_ERR_PROT_BIT;
 405                         break;
 406                 case ECC_FORM:
 407                         cf->data[2] |= CAN_ERR_PROT_FORM;
 408                         break;
 409                 case ECC_STUFF:
 410                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 411                         break;
 412                 default:
 413                         cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 414                         cf->data[3] = ecc & ECC_SEG;
 415                         break;
 416                 }
 417                 /* Error occured during transmission? */
 418                 if ((ecc & ECC_DIR) == 0)
 419                         cf->data[2] |= CAN_ERR_PROT_TX;
 420         }
 421         if (isrc & IRQ_EPI) {
 422                 /* error passive interrupt */
 423                 dev_dbg(dev->dev.parent, "error passive interrupt\n");
 424                 if (status & SR_ES)
 425                         state = CAN_STATE_ERROR_PASSIVE;
 426                 else
 427                         state = CAN_STATE_ERROR_ACTIVE;
 428         }
 429         if (isrc & IRQ_ALI) {
 430                 /* arbitration lost interrupt */
 431                 dev_dbg(dev->dev.parent, "arbitration lost interrupt\n");
 432                 alc = priv->read_reg(priv, REG_ALC);
 433                 priv->can.can_stats.arbitration_lost++;
 434                 stats->tx_errors++;
 435                 cf->can_id |= CAN_ERR_LOSTARB;
 436                 cf->data[0] = alc & 0x1f;
 437         }
 438
 439         if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
 440                                          state == CAN_STATE_ERROR_PASSIVE)) {
 441                 uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
 442                 uint8_t txerr = priv->read_reg(priv, REG_TXERR);
 443                 cf->can_id |= CAN_ERR_CRTL;
 444                 if (state == CAN_STATE_ERROR_WARNING) {
 445                         priv->can.can_stats.error_warning++;
 446                         cf->data[1] = (txerr > rxerr) ?
 447                                 CAN_ERR_CRTL_TX_WARNING :
 448                                 CAN_ERR_CRTL_RX_WARNING;
 449                 } else {
 450                         priv->can.can_stats.error_passive++;
 451                         cf->data[1] = (txerr > rxerr) ?
 452                                 CAN_ERR_CRTL_TX_PASSIVE :
 453                                 CAN_ERR_CRTL_RX_PASSIVE;
 454                 }
 455                 cf->data[6] = txerr;
 456                 cf->data[7] = rxerr;
 457         }
 458
 459         priv->can.state = state;
 460
 461         netif_rx(skb);
 462
 463         stats->rx_packets++;
 464         stats->rx_bytes += cf->can_dlc;
 465
 466         return 0;
 467 }
 468
 469 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 470 {
 471         struct net_device *dev = (struct net_device *)dev_id;
 472         struct sja1000_priv *priv = netdev_priv(dev);
 473         struct net_device_stats *stats = &dev->stats;
 474         uint8_t isrc, status;
 475         int n = 0;
 476
 477         /* Shared interrupts and IRQ off? */
 478         if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
 479                 return IRQ_NONE;
 480
 481         if (priv->pre_irq)
 482                 priv->pre_irq(priv);
 483
 484         while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
 485                 n++;
 486                 status = priv->read_reg(priv, REG_SR);
 487
 488                 if (isrc & IRQ_WUI)
 489                         dev_warn(dev->dev.parent, "wakeup interrupt\n");
 490
 491                 if (isrc & IRQ_TI) {
 492                         /* transmission complete interrupt */
 493                         stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf;
 494                         stats->tx_packets++;
 495                         can_get_echo_skb(dev, 0);
 496                         netif_wake_queue(dev);
 497                 }
 498                 if (isrc & IRQ_RI) {
 499                         /* receive interrupt */
 500                         while (status & SR_RBS) {
 501                                 sja1000_rx(dev);
 502                                 status = priv->read_reg(priv, REG_SR);
 503                         }
 504                 }
 505                 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
 506                         /* error interrupt */
 507                         if (sja1000_err(dev, isrc, status))
 508                                 break;
 509                 }
 510         }
 511
 512         if (priv->post_irq)
 513                 priv->post_irq(priv);
 514
 515         if (n >= SJA1000_MAX_IRQ)
 516                 dev_dbg(dev->dev.parent, "%d messages handled in ISR", n);
 517
 518         return (n) ? IRQ_HANDLED : IRQ_NONE;
 519 }
 520 EXPORT_SYMBOL_GPL(sja1000_interrupt);
 521
 522 static int sja1000_open(struct net_device *dev)
 523 {
 524         struct sja1000_priv *priv = netdev_priv(dev);
 525         int err;
 526
 527         /* set chip into reset mode */
 528         set_reset_mode(dev);
 529
 530         /* common open */
 531         err = open_candev(dev);
 532         if (err)
 533                 return err;
 534
 535         /* register interrupt handler, if not done by the device driver */
 536         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
 537                 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
 538                                   dev->name, (void *)dev);
 539                 if (err) {
 540                         close_candev(dev);
 541                         return -EAGAIN;
 542                 }
 543         }
 544
 545         /* init and start chi */
 546         sja1000_start(dev);
 547         priv->open_time = jiffies;
 548
 549         netif_start_queue(dev);
 550
 551         return 0;
 552 }
 553
 554 static int sja1000_close(struct net_device *dev)
 555 {
 556         struct sja1000_priv *priv = netdev_priv(dev);
 557
 558         netif_stop_queue(dev);
 559         set_reset_mode(dev);
 560
 561         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
 562                 free_irq(dev->irq, (void *)dev);
 563
 564         close_candev(dev);
 565
 566         priv->open_time = 0;
 567
 568         return 0;
 569 }
 570
 571 struct net_device *alloc_sja1000dev(int sizeof_priv)
 572 {
 573         struct net_device *dev;
 574         struct sja1000_priv *priv;
 575
 576         dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
 577                 SJA1000_ECHO_SKB_MAX);
 578         if (!dev)
 579                 return NULL;
 580
 581         priv = netdev_priv(dev);
 582
 583         priv->dev = dev;
 584         priv->can.bittiming_const = &sja1000_bittiming_const;
 585         priv->can.do_set_bittiming = sja1000_set_bittiming;
 586         priv->can.do_set_mode = sja1000_set_mode;
 587         priv->can.do_get_berr_counter = sja1000_get_berr_counter;
 588         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
 589                 CAN_CTRLMODE_BERR_REPORTING;
 590
 591         if (sizeof_priv)
 592                 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
 593
 594         return dev;
 595 }
 596 EXPORT_SYMBOL_GPL(alloc_sja1000dev);
 597
 598 void free_sja1000dev(struct net_device *dev)
 599 {
 600         free_candev(dev);
 601 }
 602 EXPORT_SYMBOL_GPL(free_sja1000dev);
 603
 604 static const struct net_device_ops sja1000_netdev_ops = {
 605        .ndo_open               = sja1000_open,
 606        .ndo_stop               = sja1000_close,
 607        .ndo_start_xmit         = sja1000_start_xmit,
 608 };
 609
 610 int register_sja1000dev(struct net_device *dev)
 611 {
 612         if (!sja1000_probe_chip(dev))
 613                 return -ENODEV;
 614
 615         dev->flags |= IFF_ECHO; /* we support local echo */
 616         dev->netdev_ops = &sja1000_netdev_ops;
 617
 618         set_reset_mode(dev);
 619         chipset_init(dev);
 620
 621         return register_candev(dev);
 622 }
 623 EXPORT_SYMBOL_GPL(register_sja1000dev);
 624
 625 void unregister_sja1000dev(struct net_device *dev)
 626 {
 627         set_reset_mode(dev);
 628         unregister_candev(dev);
 629 }
 630 EXPORT_SYMBOL_GPL(unregister_sja1000dev);
 631
 632 static __init int sja1000_init(void)
 633 {
 634         printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
 635
 636         return 0;
 637 }
 638
 639 module_init(sja1000_init);
 640
 641 static __exit void sja1000_exit(void)
 642 {
 643         printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
 644 }
 645
 646 module_exit(sja1000_exit);