kernel/2.6/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/version.h>
  51 #include <linux/sched.h>
  52 #include <linux/types.h>
  53 #include <linux/fcntl.h>
  54 #include <linux/interrupt.h>
  55 #include <linux/ptrace.h>
  56 #include <linux/string.h>
  57 #include <linux/errno.h>
  58 #include <linux/netdevice.h>
  59 #include <linux/if_arp.h>
  60 #include <linux/if_ether.h>
  61 #include <linux/skbuff.h>
  62 #include <linux/delay.h>
  63
  64 #include <socketcan/can.h>
  65 #include <socketcan/can/dev.h>
  66 #include <socketcan/can/error.h>
  67
  68 #include "sja1000.h"
  69
  70 #include <socketcan/can/version.h>      /* for RCSID. Removed by mkpatch script */
  71 RCSID("$Id: sja1000.c 531 2007-10-19 07:38:29Z hartkopp $");
  72
  73 #define DRV_NAME "sja1000"
  74
  75 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
  76 MODULE_LICENSE("Dual BSD/GPL");
  77 MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
  78
  79 static struct can_bittiming_const sja1000_bittiming_const = {
  80         .name = DRV_NAME,
  81         .tseg1_min = 1,
  82         .tseg1_max = 16,
  83         .tseg2_min = 1,
  84         .tseg2_max = 8,
  85         .sjw_max = 4,
  86         .brp_min = 1,
  87         .brp_max = 64,
  88         .brp_inc = 1,
  89 };
  90
  91 static int sja1000_probe_chip(struct net_device *dev)
  92 {
  93         struct sja1000_priv *priv = netdev_priv(dev);
  94
  95         if (priv->reg_base && (priv->read_reg(priv, 0) == 0xFF)) {
  96                 dev_info(ND2D(dev), "probing @0x%p failed\n",
  97                          priv->reg_base);
  98                 return 0;
  99         }
 100         return -1;
 101 }
 102
 103 static void set_reset_mode(struct net_device *dev)
 104 {
 105         struct sja1000_priv *priv = netdev_priv(dev);
 106         unsigned char status = priv->read_reg(priv, REG_MOD);
 107         int i;
 108
 109         /* disable interrupts */
 110         priv->write_reg(priv, REG_IER, IRQ_OFF);
 111
 112         for (i = 0; i < 100; i++) {
 113                 /* check reset bit */
 114                 if (status & MOD_RM) {
 115                         priv->can.state = CAN_STATE_STOPPED;
 116                         return;
 117                 }
 118
 119                 priv->write_reg(priv, REG_MOD, MOD_RM); /* reset chip */
 120                 udelay(10);
 121                 status = priv->read_reg(priv, REG_MOD);
 122         }
 123
 124         dev_err(ND2D(dev), "setting SJA1000 into reset mode failed!\n");
 125 }
 126
 127 static void set_normal_mode(struct net_device *dev)
 128 {
 129         struct sja1000_priv *priv = netdev_priv(dev);
 130         unsigned char status = priv->read_reg(priv, REG_MOD);
 131         int i;
 132
 133         for (i = 0; i < 100; i++) {
 134                 /* check reset bit */
 135                 if ((status & MOD_RM) == 0) {
 136                         priv->can.state = CAN_STATE_ERROR_ACTIVE;
 137                         /* enable all interrupts */
 138                         priv->write_reg(priv, REG_IER, IRQ_ALL);
 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(ND2D(dev), "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(ND2D(dev),
 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 /*
 211  * initialize SJA1000 chip:
 212  *   - reset chip
 213  *   - set output mode
 214  *   - set baudrate
 215  *   - enable interrupts
 216  *   - start operating mode
 217  */
 218 static void chipset_init(struct net_device *dev)
 219 {
 220         struct sja1000_priv *priv = netdev_priv(dev);
 221
 222         /* set clock divider and output control register */
 223         priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN);
 224
 225         /* set acceptance filter (accept all) */
 226         priv->write_reg(priv, REG_ACCC0, 0x00);
 227         priv->write_reg(priv, REG_ACCC1, 0x00);
 228         priv->write_reg(priv, REG_ACCC2, 0x00);
 229         priv->write_reg(priv, REG_ACCC3, 0x00);
 230
 231         priv->write_reg(priv, REG_ACCM0, 0xFF);
 232         priv->write_reg(priv, REG_ACCM1, 0xFF);
 233         priv->write_reg(priv, REG_ACCM2, 0xFF);
 234         priv->write_reg(priv, REG_ACCM3, 0xFF);
 235
 236         priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL);
 237 }
 238
 239 /*
 240  * transmit a CAN message
 241  * message layout in the sk_buff should be like this:
 242  * xx xx xx xx   ff      ll   00 11 22 33 44 55 66 77
 243  * [  can-id ] [flags] [len] [can data (up to 8 bytes]
 244  */
 245 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
 246 static int sja1000_start_xmit(struct sk_buff *skb, struct net_device *dev)
 247 #else
 248 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
 249                                       struct net_device *dev)
 250 #endif
 251 {
 252         struct sja1000_priv *priv = netdev_priv(dev);
 253         struct can_frame *cf = (struct can_frame *)skb->data;
 254         uint8_t fi;
 255         uint8_t dlc;
 256         canid_t id;
 257         uint8_t dreg;
 258         int i;
 259
 260         netif_stop_queue(dev);
 261
 262         fi = dlc = cf->can_dlc;
 263         id = cf->can_id;
 264
 265         if (id & CAN_RTR_FLAG)
 266                 fi |= FI_RTR;
 267
 268         if (id & CAN_EFF_FLAG) {
 269                 fi |= FI_FF;
 270                 dreg = EFF_BUF;
 271                 priv->write_reg(priv, REG_FI, fi);
 272                 priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
 273                 priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8));
 274                 priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5);
 275                 priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3);
 276         } else {
 277                 dreg = SFF_BUF;
 278                 priv->write_reg(priv, REG_FI, fi);
 279                 priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3);
 280                 priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5);
 281         }
 282
 283         for (i = 0; i < dlc; i++)
 284                 priv->write_reg(priv, dreg++, cf->data[i]);
 285
 286         dev->trans_start = jiffies;
 287
 288         can_put_echo_skb(skb, dev, 0);
 289
 290         priv->write_reg(priv, REG_CMR, CMD_TR);
 291
 292         return 0;
 293 }
 294
 295 static void sja1000_rx(struct net_device *dev)
 296 {
 297         struct sja1000_priv *priv = netdev_priv(dev);
 298 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
 299         struct net_device_stats *stats = can_get_stats(dev);
 300 #else
 301         struct net_device_stats *stats = &dev->stats;
 302 #endif
 303         struct can_frame *cf;
 304         struct sk_buff *skb;
 305         uint8_t fi;
 306         uint8_t dreg;
 307         canid_t id;
 308         uint8_t dlc;
 309         int i;
 310
 311         skb = alloc_can_skb(dev, &cf);
 312         if (skb == NULL)
 313                 return;
 314
 315         fi = priv->read_reg(priv, REG_FI);
 316         dlc = fi & 0x0F;
 317
 318         if (fi & FI_FF) {
 319                 /* extended frame format (EFF) */
 320                 dreg = EFF_BUF;
 321                 id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
 322                     | (priv->read_reg(priv, REG_ID2) << (5 + 8))
 323                     | (priv->read_reg(priv, REG_ID3) << 5)
 324                     | (priv->read_reg(priv, REG_ID4) >> 3);
 325                 id |= CAN_EFF_FLAG;
 326         } else {
 327                 /* standard frame format (SFF) */
 328                 dreg = SFF_BUF;
 329                 id = (priv->read_reg(priv, REG_ID1) << 3)
 330                     | (priv->read_reg(priv, REG_ID2) >> 5);
 331         }
 332
 333         if (fi & FI_RTR)
 334                 id |= CAN_RTR_FLAG;
 335
 336         cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
 337         memset(cf, 0, sizeof(struct can_frame));
 338         cf->can_id = id;
 339         cf->can_dlc = dlc;
 340         for (i = 0; i < dlc; i++)
 341                 cf->data[i] = priv->read_reg(priv, dreg++);
 342
 343         while (i < 8)
 344                 cf->data[i++] = 0;
 345
 346         /* release receive buffer */
 347         priv->write_reg(priv, REG_CMR, CMD_RRB);
 348
 349         netif_rx(skb);
 350
 351 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
 352         dev->last_rx = jiffies;
 353 #endif
 354         stats->rx_packets++;
 355         stats->rx_bytes += dlc;
 356 }
 357
 358 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 359 {
 360         struct sja1000_priv *priv = netdev_priv(dev);
 361 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
 362         struct net_device_stats *stats = can_get_stats(dev);
 363 #else
 364         struct net_device_stats *stats = &dev->stats;
 365 #endif
 366         struct can_frame *cf;
 367         struct sk_buff *skb;
 368         enum can_state state = priv->can.state;
 369         uint8_t ecc, alc;
 370
 371         skb = alloc_can_err_skb(dev, &cf);
 372         if (skb == NULL)
 373                 return -ENOMEM;
 374
 375         if (isrc & IRQ_DOI) {
 376                 /* data overrun interrupt */
 377                 dev_dbg(ND2D(dev), "data overrun interrupt\n");
 378                 cf->can_id |= CAN_ERR_CRTL;
 379                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 380                 stats->rx_over_errors++;
 381                 stats->rx_errors++;
 382                 priv->write_reg(priv, REG_CMR, CMD_CDO);        /* clear bit */
 383         }
 384
 385         if (isrc & IRQ_EI) {
 386                 /* error warning interrupt */
 387                 dev_dbg(ND2D(dev), "error warning interrupt\n");
 388
 389                 if (status & SR_BS) {
 390                         state = CAN_STATE_BUS_OFF;
 391                         cf->can_id |= CAN_ERR_BUSOFF;
 392                         can_bus_off(dev);
 393                 } else if (status & SR_ES) {
 394                         state = CAN_STATE_ERROR_WARNING;
 395                 } else
 396                         state = CAN_STATE_ERROR_ACTIVE;
 397         }
 398         if (isrc & IRQ_BEI) {
 399                 /* bus error interrupt */
 400                 priv->can.can_stats.bus_error++;
 401                 stats->rx_errors++;
 402
 403                 ecc = priv->read_reg(priv, REG_ECC);
 404
 405                 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 406
 407                 switch (ecc & ECC_MASK) {
 408                 case ECC_BIT:
 409                         cf->data[2] |= CAN_ERR_PROT_BIT;
 410                         break;
 411                 case ECC_FORM:
 412                         cf->data[2] |= CAN_ERR_PROT_FORM;
 413                         break;
 414                 case ECC_STUFF:
 415                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 416                         break;
 417                 default:
 418                         cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 419                         cf->data[3] = ecc & ECC_SEG;
 420                         break;
 421                 }
 422                 /* Error occured during transmission? */
 423                 if ((ecc & ECC_DIR) == 0)
 424                         cf->data[2] |= CAN_ERR_PROT_TX;
 425         }
 426         if (isrc & IRQ_EPI) {
 427                 /* error passive interrupt */
 428                 dev_dbg(ND2D(dev), "error passive interrupt\n");
 429                 if (status & SR_ES)
 430                         state = CAN_STATE_ERROR_PASSIVE;
 431                 else
 432                         state = CAN_STATE_ERROR_ACTIVE;
 433         }
 434         if (isrc & IRQ_ALI) {
 435                 /* arbitration lost interrupt */
 436                 dev_dbg(ND2D(dev), "arbitration lost interrupt\n");
 437                 alc = priv->read_reg(priv, REG_ALC);
 438                 priv->can.can_stats.arbitration_lost++;
 439                 stats->tx_errors++;
 440                 cf->can_id |= CAN_ERR_LOSTARB;
 441                 cf->data[0] = alc & 0x1f;
 442         }
 443
 444         if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
 445                                          state == CAN_STATE_ERROR_PASSIVE)) {
 446                 uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
 447                 uint8_t txerr = priv->read_reg(priv, REG_TXERR);
 448                 cf->can_id |= CAN_ERR_CRTL;
 449                 if (state == CAN_STATE_ERROR_WARNING) {
 450                         priv->can.can_stats.error_warning++;
 451                         cf->data[1] = (txerr > rxerr) ?
 452                                 CAN_ERR_CRTL_TX_WARNING :
 453                                 CAN_ERR_CRTL_RX_WARNING;
 454                 } else {
 455                         priv->can.can_stats.error_passive++;
 456                         cf->data[1] = (txerr > rxerr) ?
 457                                 CAN_ERR_CRTL_TX_PASSIVE :
 458                                 CAN_ERR_CRTL_RX_PASSIVE;
 459                 }
 460         }
 461
 462         priv->can.state = state;
 463
 464         netif_rx(skb);
 465
 466 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
 467         dev->last_rx = jiffies;
 468 #endif
 469         stats->rx_packets++;
 470         stats->rx_bytes += cf->can_dlc;
 471
 472         return 0;
 473 }
 474
 475 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
 476 irqreturn_t sja1000_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 477 #else
 478 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 479 #endif
 480 {
 481         struct net_device *dev = (struct net_device *)dev_id;
 482         struct sja1000_priv *priv = netdev_priv(dev);
 483 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
 484         struct net_device_stats *stats = can_get_stats(dev);
 485 #else
 486         struct net_device_stats *stats = &dev->stats;
 487 #endif
 488         uint8_t isrc, status;
 489         int n = 0;
 490
 491         /* Shared interrupts and IRQ off? */
 492         if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
 493                 return IRQ_NONE;
 494
 495         if (priv->pre_irq)
 496                 priv->pre_irq(priv);
 497
 498         while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
 499                 n++;
 500                 status = priv->read_reg(priv, REG_SR);
 501
 502                 if (isrc & IRQ_WUI)
 503                         dev_warn(ND2D(dev), "wakeup interrupt\n");
 504
 505                 if (isrc & IRQ_TI) {
 506                         /* transmission complete interrupt */
 507                         stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf;
 508                         stats->tx_packets++;
 509                         can_get_echo_skb(dev, 0);
 510                         netif_wake_queue(dev);
 511                 }
 512                 if (isrc & IRQ_RI) {
 513                         /* receive interrupt */
 514                         while (status & SR_RBS) {
 515                                 sja1000_rx(dev);
 516                                 status = priv->read_reg(priv, REG_SR);
 517                         }
 518                 }
 519                 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
 520                         /* error interrupt */
 521                         if (sja1000_err(dev, isrc, status))
 522                                 break;
 523                 }
 524         }
 525
 526         if (priv->post_irq)
 527                 priv->post_irq(priv);
 528
 529         if (n >= SJA1000_MAX_IRQ)
 530                 dev_dbg(ND2D(dev), "%d messages handled in ISR", n);
 531
 532         return (n) ? IRQ_HANDLED : IRQ_NONE;
 533 }
 534 EXPORT_SYMBOL_GPL(sja1000_interrupt);
 535
 536 static int sja1000_open(struct net_device *dev)
 537 {
 538         struct sja1000_priv *priv = netdev_priv(dev);
 539         int err;
 540
 541         /* set chip into reset mode */
 542         set_reset_mode(dev);
 543
 544         /* common open */
 545         err = open_candev(dev);
 546         if (err)
 547                 return err;
 548
 549         /* register interrupt handler, if not done by the device driver */
 550         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
 551                 err = request_irq(dev->irq, &sja1000_interrupt, priv->irq_flags,
 552                                   dev->name, (void *)dev);
 553                 if (err) {
 554                         close_candev(dev);
 555                         return -EAGAIN;
 556                 }
 557         }
 558
 559 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
 560         /* clear statistics */
 561         memset(&priv->can.net_stats, 0, sizeof(priv->can.net_stats));
 562 #endif
 563
 564         /* init and start chi */
 565         sja1000_start(dev);
 566         priv->open_time = jiffies;
 567
 568         netif_start_queue(dev);
 569
 570         return 0;
 571 }
 572
 573 static int sja1000_close(struct net_device *dev)
 574 {
 575         struct sja1000_priv *priv = netdev_priv(dev);
 576
 577         netif_stop_queue(dev);
 578         set_reset_mode(dev);
 579
 580         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
 581                 free_irq(dev->irq, (void *)dev);
 582
 583         close_candev(dev);
 584
 585         priv->open_time = 0;
 586
 587         return 0;
 588 }
 589
 590 struct net_device *alloc_sja1000dev(int sizeof_priv)
 591 {
 592         struct net_device *dev;
 593         struct sja1000_priv *priv;
 594
 595         dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
 596                 SJA1000_ECHO_SKB_MAX);
 597         if (!dev)
 598                 return NULL;
 599
 600         priv = netdev_priv(dev);
 601
 602         priv->dev = dev;
 603         priv->can.bittiming_const = &sja1000_bittiming_const;
 604         priv->can.do_set_bittiming = sja1000_set_bittiming;
 605         priv->can.do_set_mode = sja1000_set_mode;
 606
 607         if (sizeof_priv)
 608                 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
 609
 610         return dev;
 611 }
 612 EXPORT_SYMBOL_GPL(alloc_sja1000dev);
 613
 614 void free_sja1000dev(struct net_device *dev)
 615 {
 616         free_candev(dev);
 617 }
 618 EXPORT_SYMBOL_GPL(free_sja1000dev);
 619
 620 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,28)
 621 static const struct net_device_ops sja1000_netdev_ops = {
 622         .ndo_open               = sja1000_open,
 623         .ndo_stop               = sja1000_close,
 624         .ndo_start_xmit         = sja1000_start_xmit,
 625 };
 626 #endif
 627
 628 int register_sja1000dev(struct net_device *dev)
 629 {
 630         if (!sja1000_probe_chip(dev))
 631                 return -ENODEV;
 632
 633 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,28)
 634         dev->netdev_ops = &sja1000_netdev_ops;
 635 #else
 636         dev->open = sja1000_open;
 637         dev->stop = sja1000_close;
 638         dev->hard_start_xmit = sja1000_start_xmit;
 639 #endif
 640
 641         dev->flags |= IFF_ECHO; /* we support local echo */
 642
 643         set_reset_mode(dev);
 644         chipset_init(dev);
 645
 646         return register_candev(dev);
 647 }
 648 EXPORT_SYMBOL_GPL(register_sja1000dev);
 649
 650 void unregister_sja1000dev(struct net_device *dev)
 651 {
 652         set_reset_mode(dev);
 653         unregister_candev(dev);
 654 }
 655 EXPORT_SYMBOL_GPL(unregister_sja1000dev);
 656
 657 static __init int sja1000_init(void)
 658 {
 659         printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
 660
 661         return 0;
 662 }
 663
 664 module_init(sja1000_init);
 665
 666 static __exit void sja1000_exit(void)
 667 {
 668         printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
 669 }
 670
 671 module_exit(sja1000_exit);