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  */
  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_probe_chip(struct net_device *dev)
  99 {
 100         struct sja1000_priv *priv = netdev_priv(dev);
 101
 102         if (priv->reg_base && (priv->read_reg(priv, 0) == 0xFF)) {
 103                 printk(KERN_INFO "%s: probing @0x%lX failed\n",
 104                        DRV_NAME, dev->base_addr);
 105                 return 0;
 106         }
 107         return -1;
 108 }
 109
 110 static void set_reset_mode(struct net_device *dev)
 111 {
 112         struct sja1000_priv *priv = netdev_priv(dev);
 113         unsigned char status = priv->read_reg(priv, REG_MOD);
 114         int i;
 115
 116         /* disable interrupts */
 117         priv->write_reg(priv, REG_IER, IRQ_OFF);
 118
 119         for (i = 0; i < 100; i++) {
 120                 /* check reset bit */
 121                 if (status & MOD_RM) {
 122                         priv->can.state = CAN_STATE_STOPPED;
 123                         return;
 124                 }
 125
 126                 priv->write_reg(priv, REG_MOD, MOD_RM); /* reset chip */
 127                 udelay(10);
 128                 status = priv->read_reg(priv, REG_MOD);
 129         }
 130
 131         netdev_err(dev, "setting SJA1000 into reset mode failed!\n");
 132 }
 133
 134 static void set_normal_mode(struct net_device *dev)
 135 {
 136         struct sja1000_priv *priv = netdev_priv(dev);
 137         unsigned char status = priv->read_reg(priv, REG_MOD);
 138         int i;
 139
 140         for (i = 0; i < 100; i++) {
 141                 /* check reset bit */
 142                 if ((status & MOD_RM) == 0) {
 143                         priv->can.state = CAN_STATE_ERROR_ACTIVE;
 144                         /* enable interrupts */
 145                         if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
 146                                 priv->write_reg(priv, REG_IER, IRQ_ALL);
 147                         else
 148                                 priv->write_reg(priv, REG_IER,
 149                                                 IRQ_ALL & ~IRQ_BEI);
 150                         return;
 151                 }
 152
 153                 /* set chip to normal mode */
 154                 priv->write_reg(priv, REG_MOD, 0x00);
 155                 udelay(10);
 156                 status = priv->read_reg(priv, REG_MOD);
 157         }
 158
 159         netdev_err(dev, "setting SJA1000 into normal mode failed!\n");
 160 }
 161
 162 static void sja1000_start(struct net_device *dev)
 163 {
 164         struct sja1000_priv *priv = netdev_priv(dev);
 165
 166         /* leave reset mode */
 167         if (priv->can.state != CAN_STATE_STOPPED)
 168                 set_reset_mode(dev);
 169
 170         /* Clear error counters and error code capture */
 171         priv->write_reg(priv, REG_TXERR, 0x0);
 172         priv->write_reg(priv, REG_RXERR, 0x0);
 173         priv->read_reg(priv, REG_ECC);
 174
 175         /* leave reset mode */
 176         set_normal_mode(dev);
 177 }
 178
 179 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
 180 {
 181         struct sja1000_priv *priv = netdev_priv(dev);
 182
 183         if (!priv->open_time)
 184                 return -EINVAL;
 185
 186         switch (mode) {
 187         case CAN_MODE_START:
 188                 sja1000_start(dev);
 189                 if (netif_queue_stopped(dev))
 190                         netif_wake_queue(dev);
 191                 break;
 192
 193         default:
 194                 return -EOPNOTSUPP;
 195         }
 196
 197         return 0;
 198 }
 199
 200 static int sja1000_set_bittiming(struct net_device *dev)
 201 {
 202         struct sja1000_priv *priv = netdev_priv(dev);
 203         struct can_bittiming *bt = &priv->can.bittiming;
 204         u8 btr0, btr1;
 205
 206         btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
 207         btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
 208                 (((bt->phase_seg2 - 1) & 0x7) << 4);
 209         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
 210                 btr1 |= 0x80;
 211
 212         netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
 213
 214         priv->write_reg(priv, REG_BTR0, btr0);
 215         priv->write_reg(priv, REG_BTR1, btr1);
 216
 217         return 0;
 218 }
 219
 220 static int sja1000_get_berr_counter(const struct net_device *dev,
 221                                     struct can_berr_counter *bec)
 222 {
 223         struct sja1000_priv *priv = netdev_priv(dev);
 224
 225         bec->txerr = priv->read_reg(priv, REG_TXERR);
 226         bec->rxerr = priv->read_reg(priv, REG_RXERR);
 227
 228         return 0;
 229 }
 230
 231 /*
 232  * initialize SJA1000 chip:
 233  *   - reset chip
 234  *   - set output mode
 235  *   - set baudrate
 236  *   - enable interrupts
 237  *   - start operating mode
 238  */
 239 static void chipset_init(struct net_device *dev)
 240 {
 241         struct sja1000_priv *priv = netdev_priv(dev);
 242
 243         /* set clock divider and output control register */
 244         priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN);
 245
 246         /* set acceptance filter (accept all) */
 247         priv->write_reg(priv, REG_ACCC0, 0x00);
 248         priv->write_reg(priv, REG_ACCC1, 0x00);
 249         priv->write_reg(priv, REG_ACCC2, 0x00);
 250         priv->write_reg(priv, REG_ACCC3, 0x00);
 251
 252         priv->write_reg(priv, REG_ACCM0, 0xFF);
 253         priv->write_reg(priv, REG_ACCM1, 0xFF);
 254         priv->write_reg(priv, REG_ACCM2, 0xFF);
 255         priv->write_reg(priv, REG_ACCM3, 0xFF);
 256
 257         priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL);
 258 }
 259
 260 /*
 261  * transmit a CAN message
 262  * message layout in the sk_buff should be like this:
 263  * xx xx xx xx   ff      ll   00 11 22 33 44 55 66 77
 264  * [  can-id ] [flags] [len] [can data (up to 8 bytes]
 265  */
 266 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
 267                                             struct net_device *dev)
 268 {
 269         struct sja1000_priv *priv = netdev_priv(dev);
 270         struct can_frame *cf = (struct can_frame *)skb->data;
 271         uint8_t fi;
 272         uint8_t dlc;
 273         canid_t id;
 274         uint8_t dreg;
 275         int i;
 276
 277         if (can_dropped_invalid_skb(dev, skb))
 278                 return NETDEV_TX_OK;
 279
 280         netif_stop_queue(dev);
 281
 282         fi = dlc = cf->can_dlc;
 283         id = cf->can_id;
 284
 285         if (id & CAN_RTR_FLAG)
 286                 fi |= FI_RTR;
 287
 288         if (id & CAN_EFF_FLAG) {
 289                 fi |= FI_FF;
 290                 dreg = EFF_BUF;
 291                 priv->write_reg(priv, REG_FI, fi);
 292                 priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
 293                 priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8));
 294                 priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5);
 295                 priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3);
 296         } else {
 297                 dreg = SFF_BUF;
 298                 priv->write_reg(priv, REG_FI, fi);
 299                 priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3);
 300                 priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5);
 301         }
 302
 303         for (i = 0; i < dlc; i++)
 304                 priv->write_reg(priv, dreg++, cf->data[i]);
 305
 306         can_put_echo_skb(skb, dev, 0);
 307
 308         sja1000_write_cmdreg(priv, CMD_TR);
 309
 310         return NETDEV_TX_OK;
 311 }
 312
 313 static void sja1000_rx(struct net_device *dev)
 314 {
 315         struct sja1000_priv *priv = netdev_priv(dev);
 316         struct net_device_stats *stats = &dev->stats;
 317         struct can_frame *cf;
 318         struct sk_buff *skb;
 319         uint8_t fi;
 320         uint8_t dreg;
 321         canid_t id;
 322         int i;
 323
 324         /* create zero'ed CAN frame buffer */
 325         skb = alloc_can_skb(dev, &cf);
 326         if (skb == NULL)
 327                 return;
 328
 329         fi = priv->read_reg(priv, REG_FI);
 330
 331         if (fi & FI_FF) {
 332                 /* extended frame format (EFF) */
 333                 dreg = EFF_BUF;
 334                 id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
 335                     | (priv->read_reg(priv, REG_ID2) << (5 + 8))
 336                     | (priv->read_reg(priv, REG_ID3) << 5)
 337                     | (priv->read_reg(priv, REG_ID4) >> 3);
 338                 id |= CAN_EFF_FLAG;
 339         } else {
 340                 /* standard frame format (SFF) */
 341                 dreg = SFF_BUF;
 342                 id = (priv->read_reg(priv, REG_ID1) << 3)
 343                     | (priv->read_reg(priv, REG_ID2) >> 5);
 344         }
 345
 346         cf->can_dlc = get_can_dlc(fi & 0x0F);
 347         if (fi & FI_RTR) {
 348                 id |= CAN_RTR_FLAG;
 349         } else {
 350                 for (i = 0; i < cf->can_dlc; i++)
 351                         cf->data[i] = priv->read_reg(priv, dreg++);
 352         }
 353
 354         cf->can_id = id;
 355
 356         /* release receive buffer */
 357         sja1000_write_cmdreg(priv, CMD_RRB);
 358
 359         netif_rx(skb);
 360
 361         stats->rx_packets++;
 362         stats->rx_bytes += cf->can_dlc;
 363 }
 364
 365 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 366 {
 367         struct sja1000_priv *priv = netdev_priv(dev);
 368         struct net_device_stats *stats = &dev->stats;
 369         struct can_frame *cf;
 370         struct sk_buff *skb;
 371         enum can_state state = priv->can.state;
 372         uint8_t ecc, alc;
 373
 374         skb = alloc_can_err_skb(dev, &cf);
 375         if (skb == NULL)
 376                 return -ENOMEM;
 377
 378         if (isrc & IRQ_DOI) {
 379                 /* data overrun interrupt */
 380                 netdev_dbg(dev, "data overrun interrupt\n");
 381                 cf->can_id |= CAN_ERR_CRTL;
 382                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 383                 stats->rx_over_errors++;
 384                 stats->rx_errors++;
 385                 sja1000_write_cmdreg(priv, CMD_CDO);    /* clear bit */
 386         }
 387
 388         if (isrc & IRQ_EI) {
 389                 /* error warning interrupt */
 390                 netdev_dbg(dev, "error warning interrupt\n");
 391
 392                 if (status & SR_BS) {
 393                         state = CAN_STATE_BUS_OFF;
 394                         cf->can_id |= CAN_ERR_BUSOFF;
 395                         can_bus_off(dev);
 396                 } else if (status & SR_ES) {
 397                         state = CAN_STATE_ERROR_WARNING;
 398                 } else
 399                         state = CAN_STATE_ERROR_ACTIVE;
 400         }
 401         if (isrc & IRQ_BEI) {
 402                 /* bus error interrupt */
 403                 priv->can.can_stats.bus_error++;
 404                 stats->rx_errors++;
 405
 406                 ecc = priv->read_reg(priv, REG_ECC);
 407
 408                 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 409
 410                 switch (ecc & ECC_MASK) {
 411                 case ECC_BIT:
 412                         cf->data[2] |= CAN_ERR_PROT_BIT;
 413                         break;
 414                 case ECC_FORM:
 415                         cf->data[2] |= CAN_ERR_PROT_FORM;
 416                         break;
 417                 case ECC_STUFF:
 418                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 419                         break;
 420                 default:
 421                         cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 422                         cf->data[3] = ecc & ECC_SEG;
 423                         break;
 424                 }
 425                 /* Error occurred during transmission? */
 426                 if ((ecc & ECC_DIR) == 0)
 427                         cf->data[2] |= CAN_ERR_PROT_TX;
 428         }
 429         if (isrc & IRQ_EPI) {
 430                 /* error passive interrupt */
 431                 netdev_dbg(dev, "error passive interrupt\n");
 432                 if (status & SR_ES)
 433                         state = CAN_STATE_ERROR_PASSIVE;
 434                 else
 435                         state = CAN_STATE_ERROR_ACTIVE;
 436         }
 437         if (isrc & IRQ_ALI) {
 438                 /* arbitration lost interrupt */
 439                 netdev_dbg(dev, "arbitration lost interrupt\n");
 440                 alc = priv->read_reg(priv, REG_ALC);
 441                 priv->can.can_stats.arbitration_lost++;
 442                 stats->tx_errors++;
 443                 cf->can_id |= CAN_ERR_LOSTARB;
 444                 cf->data[0] = alc & 0x1f;
 445         }
 446
 447         if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
 448                                          state == CAN_STATE_ERROR_PASSIVE)) {
 449                 uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
 450                 uint8_t txerr = priv->read_reg(priv, REG_TXERR);
 451                 cf->can_id |= CAN_ERR_CRTL;
 452                 if (state == CAN_STATE_ERROR_WARNING) {
 453                         priv->can.can_stats.error_warning++;
 454                         cf->data[1] = (txerr > rxerr) ?
 455                                 CAN_ERR_CRTL_TX_WARNING :
 456                                 CAN_ERR_CRTL_RX_WARNING;
 457                 } else {
 458                         priv->can.can_stats.error_passive++;
 459                         cf->data[1] = (txerr > rxerr) ?
 460                                 CAN_ERR_CRTL_TX_PASSIVE :
 461                                 CAN_ERR_CRTL_RX_PASSIVE;
 462                 }
 463                 cf->data[6] = txerr;
 464                 cf->data[7] = rxerr;
 465         }
 466
 467         priv->can.state = state;
 468
 469         netif_rx(skb);
 470
 471         stats->rx_packets++;
 472         stats->rx_bytes += cf->can_dlc;
 473
 474         return 0;
 475 }
 476
 477 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 478 {
 479         struct net_device *dev = (struct net_device *)dev_id;
 480         struct sja1000_priv *priv = netdev_priv(dev);
 481         struct net_device_stats *stats = &dev->stats;
 482         uint8_t isrc, status;
 483         int n = 0;
 484
 485         /* Shared interrupts and IRQ off? */
 486         if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
 487                 return IRQ_NONE;
 488
 489         if (priv->pre_irq)
 490                 priv->pre_irq(priv);
 491
 492         while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
 493                 n++;
 494                 status = priv->read_reg(priv, REG_SR);
 495
 496                 if (isrc & IRQ_WUI)
 497                         netdev_warn(dev, "wakeup interrupt\n");
 498
 499                 if (isrc & IRQ_TI) {
 500                         /* transmission complete interrupt */
 501                         stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf;
 502                         stats->tx_packets++;
 503                         can_get_echo_skb(dev, 0);
 504                         netif_wake_queue(dev);
 505                 }
 506                 if (isrc & IRQ_RI) {
 507                         /* receive interrupt */
 508                         while (status & SR_RBS) {
 509                                 sja1000_rx(dev);
 510                                 status = priv->read_reg(priv, REG_SR);
 511                         }
 512                 }
 513                 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
 514                         /* error interrupt */
 515                         if (sja1000_err(dev, isrc, status))
 516                                 break;
 517                 }
 518         }
 519
 520         if (priv->post_irq)
 521                 priv->post_irq(priv);
 522
 523         if (n >= SJA1000_MAX_IRQ)
 524                 netdev_dbg(dev, "%d messages handled in ISR", n);
 525
 526         return (n) ? IRQ_HANDLED : IRQ_NONE;
 527 }
 528 EXPORT_SYMBOL_GPL(sja1000_interrupt);
 529
 530 static int sja1000_open(struct net_device *dev)
 531 {
 532         struct sja1000_priv *priv = netdev_priv(dev);
 533         int err;
 534
 535         /* set chip into reset mode */
 536         set_reset_mode(dev);
 537
 538         /* common open */
 539         err = open_candev(dev);
 540         if (err)
 541                 return err;
 542
 543         /* register interrupt handler, if not done by the device driver */
 544         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
 545                 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
 546                                   dev->name, (void *)dev);
 547                 if (err) {
 548                         close_candev(dev);
 549                         return -EAGAIN;
 550                 }
 551         }
 552
 553         /* init and start chi */
 554         sja1000_start(dev);
 555         priv->open_time = jiffies;
 556
 557         netif_start_queue(dev);
 558
 559         return 0;
 560 }
 561
 562 static int sja1000_close(struct net_device *dev)
 563 {
 564         struct sja1000_priv *priv = netdev_priv(dev);
 565
 566         netif_stop_queue(dev);
 567         set_reset_mode(dev);
 568
 569         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
 570                 free_irq(dev->irq, (void *)dev);
 571
 572         close_candev(dev);
 573
 574         priv->open_time = 0;
 575
 576         return 0;
 577 }
 578
 579 struct net_device *alloc_sja1000dev(int sizeof_priv)
 580 {
 581         struct net_device *dev;
 582         struct sja1000_priv *priv;
 583
 584         dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
 585                 SJA1000_ECHO_SKB_MAX);
 586         if (!dev)
 587                 return NULL;
 588
 589         priv = netdev_priv(dev);
 590
 591         priv->dev = dev;
 592         priv->can.bittiming_const = &sja1000_bittiming_const;
 593         priv->can.do_set_bittiming = sja1000_set_bittiming;
 594         priv->can.do_set_mode = sja1000_set_mode;
 595         priv->can.do_get_berr_counter = sja1000_get_berr_counter;
 596         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
 597                 CAN_CTRLMODE_BERR_REPORTING;
 598
 599         spin_lock_init(&priv->cmdreg_lock);
 600
 601         if (sizeof_priv)
 602                 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
 603
 604         return dev;
 605 }
 606 EXPORT_SYMBOL_GPL(alloc_sja1000dev);
 607
 608 void free_sja1000dev(struct net_device *dev)
 609 {
 610         free_candev(dev);
 611 }
 612 EXPORT_SYMBOL_GPL(free_sja1000dev);
 613
 614 static const struct net_device_ops sja1000_netdev_ops = {
 615        .ndo_open               = sja1000_open,
 616        .ndo_stop               = sja1000_close,
 617        .ndo_start_xmit         = sja1000_start_xmit,
 618 };
 619
 620 int register_sja1000dev(struct net_device *dev)
 621 {
 622         if (!sja1000_probe_chip(dev))
 623                 return -ENODEV;
 624
 625         dev->flags |= IFF_ECHO; /* we support local echo */
 626         dev->netdev_ops = &sja1000_netdev_ops;
 627
 628         set_reset_mode(dev);
 629         chipset_init(dev);
 630
 631         return register_candev(dev);
 632 }
 633 EXPORT_SYMBOL_GPL(register_sja1000dev);
 634
 635 void unregister_sja1000dev(struct net_device *dev)
 636 {
 637         set_reset_mode(dev);
 638         unregister_candev(dev);
 639 }
 640 EXPORT_SYMBOL_GPL(unregister_sja1000dev);
 641
 642 static __init int sja1000_init(void)
 643 {
 644         printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
 645
 646         return 0;
 647 }
 648
 649 module_init(sja1000_init);
 650
 651 static __exit void sja1000_exit(void)
 652 {
 653         printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
 654 }
 655
 656 module_exit(sja1000_exit);