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 = dev_alloc_skb(sizeof(struct can_frame));
 312         if (skb == NULL)
 313                 return;
 314         skb->dev = dev;
 315         skb->protocol = htons(ETH_P_CAN);
 316
 317         fi = priv->read_reg(priv, REG_FI);
 318         dlc = fi & 0x0F;
 319
 320         if (fi & FI_FF) {
 321                 /* extended frame format (EFF) */
 322                 dreg = EFF_BUF;
 323                 id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
 324                     | (priv->read_reg(priv, REG_ID2) << (5 + 8))
 325                     | (priv->read_reg(priv, REG_ID3) << 5)
 326                     | (priv->read_reg(priv, REG_ID4) >> 3);
 327                 id |= CAN_EFF_FLAG;
 328         } else {
 329                 /* standard frame format (SFF) */
 330                 dreg = SFF_BUF;
 331                 id = (priv->read_reg(priv, REG_ID1) << 3)
 332                     | (priv->read_reg(priv, REG_ID2) >> 5);
 333         }
 334
 335         if (fi & FI_RTR)
 336                 id |= CAN_RTR_FLAG;
 337
 338         cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
 339         memset(cf, 0, sizeof(struct can_frame));
 340         cf->can_id = id;
 341         cf->can_dlc = dlc;
 342         for (i = 0; i < dlc; i++)
 343                 cf->data[i] = priv->read_reg(priv, dreg++);
 344
 345         while (i < 8)
 346                 cf->data[i++] = 0;
 347
 348         /* release receive buffer */
 349         priv->write_reg(priv, REG_CMR, CMD_RRB);
 350
 351         netif_rx(skb);
 352
 353 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
 354         dev->last_rx = jiffies;
 355 #endif
 356         stats->rx_packets++;
 357         stats->rx_bytes += dlc;
 358 }
 359
 360 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 361 {
 362         struct sja1000_priv *priv = netdev_priv(dev);
 363 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
 364         struct net_device_stats *stats = can_get_stats(dev);
 365 #else
 366         struct net_device_stats *stats = &dev->stats;
 367 #endif
 368         struct can_frame *cf;
 369         struct sk_buff *skb;
 370         enum can_state state = priv->can.state;
 371         uint8_t ecc, alc;
 372
 373         skb = dev_alloc_skb(sizeof(struct can_frame));
 374         if (skb == NULL)
 375                 return -ENOMEM;
 376         skb->dev = dev;
 377         skb->protocol = htons(ETH_P_CAN);
 378         cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
 379         memset(cf, 0, sizeof(struct can_frame));
 380         cf->can_id = CAN_ERR_FLAG;
 381         cf->can_dlc = CAN_ERR_DLC;
 382
 383         if (isrc & IRQ_DOI) {
 384                 /* data overrun interrupt */
 385                 dev_dbg(ND2D(dev), "data overrun interrupt\n");
 386                 cf->can_id |= CAN_ERR_CRTL;
 387                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 388                 stats->rx_over_errors++;
 389                 stats->rx_errors++;
 390                 priv->write_reg(priv, REG_CMR, CMD_CDO);        /* clear bit */
 391         }
 392
 393         if (isrc & IRQ_EI) {
 394                 /* error warning interrupt */
 395                 dev_dbg(ND2D(dev), "error warning interrupt\n");
 396
 397                 if (status & SR_BS) {
 398                         state = CAN_STATE_BUS_OFF;
 399                         cf->can_id |= CAN_ERR_BUSOFF;
 400                         can_bus_off(dev);
 401                 } else if (status & SR_ES) {
 402                         state = CAN_STATE_ERROR_WARNING;
 403                 } else
 404                         state = CAN_STATE_ERROR_ACTIVE;
 405         }
 406         if (isrc & IRQ_BEI) {
 407                 /* bus error interrupt */
 408                 priv->can.can_stats.bus_error++;
 409                 stats->rx_errors++;
 410
 411                 ecc = priv->read_reg(priv, REG_ECC);
 412
 413                 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 414
 415                 switch (ecc & ECC_MASK) {
 416                 case ECC_BIT:
 417                         cf->data[2] |= CAN_ERR_PROT_BIT;
 418                         break;
 419                 case ECC_FORM:
 420                         cf->data[2] |= CAN_ERR_PROT_FORM;
 421                         break;
 422                 case ECC_STUFF:
 423                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 424                         break;
 425                 default:
 426                         cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 427                         cf->data[3] = ecc & ECC_SEG;
 428                         break;
 429                 }
 430                 /* Error occured during transmission? */
 431                 if ((ecc & ECC_DIR) == 0)
 432                         cf->data[2] |= CAN_ERR_PROT_TX;
 433         }
 434         if (isrc & IRQ_EPI) {
 435                 /* error passive interrupt */
 436                 dev_dbg(ND2D(dev), "error passive interrupt\n");
 437                 if (status & SR_ES)
 438                         state = CAN_STATE_ERROR_PASSIVE;
 439                 else
 440                         state = CAN_STATE_ERROR_ACTIVE;
 441         }
 442         if (isrc & IRQ_ALI) {
 443                 /* arbitration lost interrupt */
 444                 dev_dbg(ND2D(dev), "arbitration lost interrupt\n");
 445                 alc = priv->read_reg(priv, REG_ALC);
 446                 priv->can.can_stats.arbitration_lost++;
 447                 stats->tx_errors++;
 448                 cf->can_id |= CAN_ERR_LOSTARB;
 449                 cf->data[0] = alc & 0x1f;
 450         }
 451
 452         if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
 453                                          state == CAN_STATE_ERROR_PASSIVE)) {
 454                 uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
 455                 uint8_t txerr = priv->read_reg(priv, REG_TXERR);
 456                 cf->can_id |= CAN_ERR_CRTL;
 457                 if (state == CAN_STATE_ERROR_WARNING) {
 458                         priv->can.can_stats.error_warning++;
 459                         cf->data[1] = (txerr > rxerr) ?
 460                                 CAN_ERR_CRTL_TX_WARNING :
 461                                 CAN_ERR_CRTL_RX_WARNING;
 462                 } else {
 463                         priv->can.can_stats.error_passive++;
 464                         cf->data[1] = (txerr > rxerr) ?
 465                                 CAN_ERR_CRTL_TX_PASSIVE :
 466                                 CAN_ERR_CRTL_RX_PASSIVE;
 467                 }
 468         }
 469
 470         priv->can.state = state;
 471
 472         netif_rx(skb);
 473
 474 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
 475         dev->last_rx = jiffies;
 476 #endif
 477         stats->rx_packets++;
 478         stats->rx_bytes += cf->can_dlc;
 479
 480         return 0;
 481 }
 482
 483 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
 484 irqreturn_t sja1000_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 485 #else
 486 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 487 #endif
 488 {
 489         struct net_device *dev = (struct net_device *)dev_id;
 490         struct sja1000_priv *priv = netdev_priv(dev);
 491 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
 492         struct net_device_stats *stats = can_get_stats(dev);
 493 #else
 494         struct net_device_stats *stats = &dev->stats;
 495 #endif
 496         uint8_t isrc, status;
 497         int n = 0;
 498
 499         /* Shared interrupts and IRQ off? */
 500         if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
 501                 return IRQ_NONE;
 502
 503         if (priv->pre_irq)
 504                 priv->pre_irq(priv);
 505
 506         while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
 507                 n++;
 508                 status = priv->read_reg(priv, REG_SR);
 509
 510                 if (isrc & IRQ_WUI)
 511                         dev_warn(ND2D(dev), "wakeup interrupt\n");
 512
 513                 if (isrc & IRQ_TI) {
 514                         /* transmission complete interrupt */
 515                         stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf;
 516                         stats->tx_packets++;
 517                         can_get_echo_skb(dev, 0);
 518                         netif_wake_queue(dev);
 519                 }
 520                 if (isrc & IRQ_RI) {
 521                         /* receive interrupt */
 522                         while (status & SR_RBS) {
 523                                 sja1000_rx(dev);
 524                                 status = priv->read_reg(priv, REG_SR);
 525                         }
 526                 }
 527                 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
 528                         /* error interrupt */
 529                         if (sja1000_err(dev, isrc, status))
 530                                 break;
 531                 }
 532         }
 533
 534         if (priv->post_irq)
 535                 priv->post_irq(priv);
 536
 537         if (n >= SJA1000_MAX_IRQ)
 538                 dev_dbg(ND2D(dev), "%d messages handled in ISR", n);
 539
 540         return (n) ? IRQ_HANDLED : IRQ_NONE;
 541 }
 542 EXPORT_SYMBOL_GPL(sja1000_interrupt);
 543
 544 static int sja1000_open(struct net_device *dev)
 545 {
 546         struct sja1000_priv *priv = netdev_priv(dev);
 547         int err;
 548
 549         /* set chip into reset mode */
 550         set_reset_mode(dev);
 551
 552         /* common open */
 553         err = open_candev(dev);
 554         if (err)
 555                 return err;
 556
 557         /* register interrupt handler, if not done by the device driver */
 558         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
 559                 err = request_irq(dev->irq, &sja1000_interrupt, priv->irq_flags,
 560                                   dev->name, (void *)dev);
 561                 if (err) {
 562                         close_candev(dev);
 563                         return -EAGAIN;
 564                 }
 565         }
 566
 567 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
 568         /* clear statistics */
 569         memset(&priv->can.net_stats, 0, sizeof(priv->can.net_stats));
 570 #endif
 571
 572         /* init and start chi */
 573         sja1000_start(dev);
 574         priv->open_time = jiffies;
 575
 576         netif_start_queue(dev);
 577
 578         return 0;
 579 }
 580
 581 static int sja1000_close(struct net_device *dev)
 582 {
 583         struct sja1000_priv *priv = netdev_priv(dev);
 584
 585         netif_stop_queue(dev);
 586         set_reset_mode(dev);
 587
 588         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
 589                 free_irq(dev->irq, (void *)dev);
 590
 591         close_candev(dev);
 592
 593         priv->open_time = 0;
 594
 595         return 0;
 596 }
 597
 598 struct net_device *alloc_sja1000dev(int sizeof_priv)
 599 {
 600         struct net_device *dev;
 601         struct sja1000_priv *priv;
 602
 603         dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
 604                 SJA1000_ECHO_SKB_MAX);
 605         if (!dev)
 606                 return NULL;
 607
 608         priv = netdev_priv(dev);
 609
 610         priv->dev = dev;
 611         priv->can.bittiming_const = &sja1000_bittiming_const;
 612         priv->can.do_set_bittiming = sja1000_set_bittiming;
 613         priv->can.do_set_mode = sja1000_set_mode;
 614
 615         if (sizeof_priv)
 616                 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
 617
 618         return dev;
 619 }
 620 EXPORT_SYMBOL_GPL(alloc_sja1000dev);
 621
 622 void free_sja1000dev(struct net_device *dev)
 623 {
 624         free_candev(dev);
 625 }
 626 EXPORT_SYMBOL_GPL(free_sja1000dev);
 627
 628 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,28)
 629 static const struct net_device_ops sja1000_netdev_ops = {
 630         .ndo_open               = sja1000_open,
 631         .ndo_stop               = sja1000_close,
 632         .ndo_start_xmit         = sja1000_start_xmit,
 633 };
 634 #endif
 635
 636 int register_sja1000dev(struct net_device *dev)
 637 {
 638         if (!sja1000_probe_chip(dev))
 639                 return -ENODEV;
 640
 641 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,28)
 642         dev->netdev_ops = &sja1000_netdev_ops;
 643 #else
 644         dev->open = sja1000_open;
 645         dev->stop = sja1000_close;
 646         dev->hard_start_xmit = sja1000_start_xmit;
 647 #endif
 648
 649         dev->flags |= IFF_ECHO; /* we support local echo */
 650
 651         set_reset_mode(dev);
 652         chipset_init(dev);
 653
 654         return register_candev(dev);
 655 }
 656 EXPORT_SYMBOL_GPL(register_sja1000dev);
 657
 658 void unregister_sja1000dev(struct net_device *dev)
 659 {
 660         set_reset_mode(dev);
 661         unregister_candev(dev);
 662 }
 663 EXPORT_SYMBOL_GPL(unregister_sja1000dev);
 664
 665 static __init int sja1000_init(void)
 666 {
 667         printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
 668
 669         return 0;
 670 }
 671
 672 module_init(sja1000_init);
 673
 674 static __exit void sja1000_exit(void)
 675 {
 676         printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
 677 }
 678
 679 module_exit(sja1000_exit);