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/dev.h>
  64 #include <linux/can/error.h>
  65
  66 #include "sja1000.h"
  67
  68 #define DRV_NAME "sja1000"
  69
  70 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
  71 MODULE_LICENSE("Dual BSD/GPL");
  72 MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
  73
  74 static struct can_bittiming_const sja1000_bittiming_const = {
  75         .name = DRV_NAME,
  76         .tseg1_min = 1,
  77         .tseg1_max = 16,
  78         .tseg2_min = 1,
  79         .tseg2_max = 8,
  80         .sjw_max = 4,
  81         .brp_min = 1,
  82         .brp_max = 64,
  83         .brp_inc = 1,
  84 };
  85
  86 static void sja1000_write_cmdreg(struct sja1000_priv *priv, u8 val)
  87 {
  88         unsigned long flags;
  89
  90         /*
  91          * The command register needs some locking and time to settle
  92          * the write_reg() operation - especially on SMP systems.
  93          */
  94         spin_lock_irqsave(&priv->cmdreg_lock, flags);
  95         priv->write_reg(priv, REG_CMR, val);
  96         priv->read_reg(priv, REG_SR);
  97         spin_unlock_irqrestore(&priv->cmdreg_lock, flags);
  98 }
  99
 100 static int sja1000_probe_chip(struct net_device *dev)
 101 {
 102         struct sja1000_priv *priv = netdev_priv(dev);
 103
 104         if (priv->reg_base && (priv->read_reg(priv, 0) == 0xFF)) {
 105                 printk(KERN_INFO "%s: probing @0x%lX failed\n",
 106                        DRV_NAME, dev->base_addr);
 107                 return 0;
 108         }
 109         return -1;
 110 }
 111
 112 static void set_reset_mode(struct net_device *dev)
 113 {
 114         struct sja1000_priv *priv = netdev_priv(dev);
 115         unsigned char status = priv->read_reg(priv, REG_MOD);
 116         int i;
 117
 118         /* disable interrupts */
 119         priv->write_reg(priv, REG_IER, IRQ_OFF);
 120
 121         for (i = 0; i < 100; i++) {
 122                 /* check reset bit */
 123                 if (status & MOD_RM) {
 124                         priv->can.state = CAN_STATE_STOPPED;
 125                         return;
 126                 }
 127
 128                 priv->write_reg(priv, REG_MOD, MOD_RM); /* reset chip */
 129                 udelay(10);
 130                 status = priv->read_reg(priv, REG_MOD);
 131         }
 132
 133         dev_err(dev->dev.parent, "setting SJA1000 into reset mode failed!\n");
 134 }
 135
 136 static void set_normal_mode(struct net_device *dev)
 137 {
 138         struct sja1000_priv *priv = netdev_priv(dev);
 139         unsigned char status = priv->read_reg(priv, REG_MOD);
 140         int i;
 141
 142         for (i = 0; i < 100; i++) {
 143                 /* check reset bit */
 144                 if ((status & MOD_RM) == 0) {
 145                         priv->can.state = CAN_STATE_ERROR_ACTIVE;
 146                         /* enable interrupts */
 147                         if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
 148                                 priv->write_reg(priv, REG_IER, IRQ_ALL);
 149                         else
 150                                 priv->write_reg(priv, REG_IER,
 151                                                 IRQ_ALL & ~IRQ_BEI);
 152                         return;
 153                 }
 154
 155                 /* set chip to normal mode */
 156                 priv->write_reg(priv, REG_MOD, 0x00);
 157                 udelay(10);
 158                 status = priv->read_reg(priv, REG_MOD);
 159         }
 160
 161         dev_err(dev->dev.parent, "setting SJA1000 into normal mode failed!\n");
 162 }
 163
 164 static void sja1000_start(struct net_device *dev)
 165 {
 166         struct sja1000_priv *priv = netdev_priv(dev);
 167
 168         /* leave reset mode */
 169         if (priv->can.state != CAN_STATE_STOPPED)
 170                 set_reset_mode(dev);
 171
 172         /* Clear error counters and error code capture */
 173         priv->write_reg(priv, REG_TXERR, 0x0);
 174         priv->write_reg(priv, REG_RXERR, 0x0);
 175         priv->read_reg(priv, REG_ECC);
 176
 177         /* leave reset mode */
 178         set_normal_mode(dev);
 179 }
 180
 181 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
 182 {
 183         struct sja1000_priv *priv = netdev_priv(dev);
 184
 185         if (!priv->open_time)
 186                 return -EINVAL;
 187
 188         switch (mode) {
 189         case CAN_MODE_START:
 190                 sja1000_start(dev);
 191                 if (netif_queue_stopped(dev))
 192                         netif_wake_queue(dev);
 193                 break;
 194
 195         default:
 196                 return -EOPNOTSUPP;
 197         }
 198
 199         return 0;
 200 }
 201
 202 static int sja1000_set_bittiming(struct net_device *dev)
 203 {
 204         struct sja1000_priv *priv = netdev_priv(dev);
 205         struct can_bittiming *bt = &priv->can.bittiming;
 206         u8 btr0, btr1;
 207
 208         btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
 209         btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
 210                 (((bt->phase_seg2 - 1) & 0x7) << 4);
 211         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
 212                 btr1 |= 0x80;
 213
 214         dev_info(dev->dev.parent,
 215                  "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
 216
 217         priv->write_reg(priv, REG_BTR0, btr0);
 218         priv->write_reg(priv, REG_BTR1, btr1);
 219
 220         return 0;
 221 }
 222
 223 static int sja1000_get_berr_counter(const struct net_device *dev,
 224                                     struct can_berr_counter *bec)
 225 {
 226         struct sja1000_priv *priv = netdev_priv(dev);
 227
 228         bec->txerr = priv->read_reg(priv, REG_TXERR);
 229         bec->rxerr = priv->read_reg(priv, REG_RXERR);
 230
 231         return 0;
 232 }
 233
 234 /*
 235  * initialize SJA1000 chip:
 236  *   - reset chip
 237  *   - set output mode
 238  *   - set baudrate
 239  *   - enable interrupts
 240  *   - start operating mode
 241  */
 242 static void chipset_init(struct net_device *dev)
 243 {
 244         struct sja1000_priv *priv = netdev_priv(dev);
 245
 246         /* set clock divider and output control register */
 247         priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN);
 248
 249         /* set acceptance filter (accept all) */
 250         priv->write_reg(priv, REG_ACCC0, 0x00);
 251         priv->write_reg(priv, REG_ACCC1, 0x00);
 252         priv->write_reg(priv, REG_ACCC2, 0x00);
 253         priv->write_reg(priv, REG_ACCC3, 0x00);
 254
 255         priv->write_reg(priv, REG_ACCM0, 0xFF);
 256         priv->write_reg(priv, REG_ACCM1, 0xFF);
 257         priv->write_reg(priv, REG_ACCM2, 0xFF);
 258         priv->write_reg(priv, REG_ACCM3, 0xFF);
 259
 260         priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL);
 261 }
 262
 263 /*
 264  * transmit a CAN message
 265  * message layout in the sk_buff should be like this:
 266  * xx xx xx xx   ff      ll   00 11 22 33 44 55 66 77
 267  * [  can-id ] [flags] [len] [can data (up to 8 bytes]
 268  */
 269 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
 270                                             struct net_device *dev)
 271 {
 272         struct sja1000_priv *priv = netdev_priv(dev);
 273         struct can_frame *cf = (struct can_frame *)skb->data;
 274         uint8_t fi;
 275         uint8_t dlc;
 276         canid_t id;
 277         uint8_t dreg;
 278         int i;
 279
 280         if (can_dropped_invalid_skb(dev, skb))
 281                 return NETDEV_TX_OK;
 282
 283         netif_stop_queue(dev);
 284
 285         fi = dlc = cf->can_dlc;
 286         id = cf->can_id;
 287
 288         if (id & CAN_RTR_FLAG)
 289                 fi |= FI_RTR;
 290
 291         if (id & CAN_EFF_FLAG) {
 292                 fi |= FI_FF;
 293                 dreg = EFF_BUF;
 294                 priv->write_reg(priv, REG_FI, fi);
 295                 priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
 296                 priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8));
 297                 priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5);
 298                 priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3);
 299         } else {
 300                 dreg = SFF_BUF;
 301                 priv->write_reg(priv, REG_FI, fi);
 302                 priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3);
 303                 priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5);
 304         }
 305
 306         for (i = 0; i < dlc; i++)
 307                 priv->write_reg(priv, dreg++, cf->data[i]);
 308
 309         can_put_echo_skb(skb, dev, 0);
 310
 311         sja1000_write_cmdreg(priv, CMD_TR);
 312
 313         return NETDEV_TX_OK;
 314 }
 315
 316 static void sja1000_rx(struct net_device *dev)
 317 {
 318         struct sja1000_priv *priv = netdev_priv(dev);
 319         struct net_device_stats *stats = &dev->stats;
 320         struct can_frame *cf;
 321         struct sk_buff *skb;
 322         uint8_t fi;
 323         uint8_t dreg;
 324         canid_t id;
 325         int i;
 326
 327         /* create zero'ed CAN frame buffer */
 328         skb = alloc_can_skb(dev, &cf);
 329         if (skb == NULL)
 330                 return;
 331
 332         fi = priv->read_reg(priv, REG_FI);
 333
 334         if (fi & FI_FF) {
 335                 /* extended frame format (EFF) */
 336                 dreg = EFF_BUF;
 337                 id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
 338                     | (priv->read_reg(priv, REG_ID2) << (5 + 8))
 339                     | (priv->read_reg(priv, REG_ID3) << 5)
 340                     | (priv->read_reg(priv, REG_ID4) >> 3);
 341                 id |= CAN_EFF_FLAG;
 342         } else {
 343                 /* standard frame format (SFF) */
 344                 dreg = SFF_BUF;
 345                 id = (priv->read_reg(priv, REG_ID1) << 3)
 346                     | (priv->read_reg(priv, REG_ID2) >> 5);
 347         }
 348
 349         if (fi & FI_RTR) {
 350                 id |= CAN_RTR_FLAG;
 351         } else {
 352                 cf->can_dlc = get_can_dlc(fi & 0x0F);
 353                 for (i = 0; i < cf->can_dlc; i++)
 354                         cf->data[i] = priv->read_reg(priv, dreg++);
 355         }
 356
 357         cf->can_id = id;
 358
 359         /* release receive buffer */
 360         sja1000_write_cmdreg(priv, CMD_RRB);
 361
 362         netif_rx(skb);
 363
 364         stats->rx_packets++;
 365         stats->rx_bytes += cf->can_dlc;
 366 }
 367
 368 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 369 {
 370         struct sja1000_priv *priv = netdev_priv(dev);
 371         struct net_device_stats *stats = &dev->stats;
 372         struct can_frame *cf;
 373         struct sk_buff *skb;
 374         enum can_state state = priv->can.state;
 375         uint8_t ecc, alc;
 376
 377         skb = alloc_can_err_skb(dev, &cf);
 378         if (skb == NULL)
 379                 return -ENOMEM;
 380
 381         if (isrc & IRQ_DOI) {
 382                 /* data overrun interrupt */
 383                 dev_dbg(dev->dev.parent, "data overrun interrupt\n");
 384                 cf->can_id |= CAN_ERR_CRTL;
 385                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 386                 stats->rx_over_errors++;
 387                 stats->rx_errors++;
 388                 sja1000_write_cmdreg(priv, CMD_CDO);    /* clear bit */
 389         }
 390
 391         if (isrc & IRQ_EI) {
 392                 /* error warning interrupt */
 393                 dev_dbg(dev->dev.parent, "error warning interrupt\n");
 394
 395                 if (status & SR_BS) {
 396                         state = CAN_STATE_BUS_OFF;
 397                         cf->can_id |= CAN_ERR_BUSOFF;
 398                         can_bus_off(dev);
 399                 } else if (status & SR_ES) {
 400                         state = CAN_STATE_ERROR_WARNING;
 401                 } else
 402                         state = CAN_STATE_ERROR_ACTIVE;
 403         }
 404         if (isrc & IRQ_BEI) {
 405                 /* bus error interrupt */
 406                 priv->can.can_stats.bus_error++;
 407                 stats->rx_errors++;
 408
 409                 ecc = priv->read_reg(priv, REG_ECC);
 410
 411                 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 412
 413                 switch (ecc & ECC_MASK) {
 414                 case ECC_BIT:
 415                         cf->data[2] |= CAN_ERR_PROT_BIT;
 416                         break;
 417                 case ECC_FORM:
 418                         cf->data[2] |= CAN_ERR_PROT_FORM;
 419                         break;
 420                 case ECC_STUFF:
 421                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 422                         break;
 423                 default:
 424                         cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 425                         cf->data[3] = ecc & ECC_SEG;
 426                         break;
 427                 }
 428                 /* Error occurred during transmission? */
 429                 if ((ecc & ECC_DIR) == 0)
 430                         cf->data[2] |= CAN_ERR_PROT_TX;
 431         }
 432         if (isrc & IRQ_EPI) {
 433                 /* error passive interrupt */
 434                 dev_dbg(dev->dev.parent, "error passive interrupt\n");
 435                 if (status & SR_ES)
 436                         state = CAN_STATE_ERROR_PASSIVE;
 437                 else
 438                         state = CAN_STATE_ERROR_ACTIVE;
 439         }
 440         if (isrc & IRQ_ALI) {
 441                 /* arbitration lost interrupt */
 442                 dev_dbg(dev->dev.parent, "arbitration lost interrupt\n");
 443                 alc = priv->read_reg(priv, REG_ALC);
 444                 priv->can.can_stats.arbitration_lost++;
 445                 stats->tx_errors++;
 446                 cf->can_id |= CAN_ERR_LOSTARB;
 447                 cf->data[0] = alc & 0x1f;
 448         }
 449
 450         if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
 451                                          state == CAN_STATE_ERROR_PASSIVE)) {
 452                 uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
 453                 uint8_t txerr = priv->read_reg(priv, REG_TXERR);
 454                 cf->can_id |= CAN_ERR_CRTL;
 455                 if (state == CAN_STATE_ERROR_WARNING) {
 456                         priv->can.can_stats.error_warning++;
 457                         cf->data[1] = (txerr > rxerr) ?
 458                                 CAN_ERR_CRTL_TX_WARNING :
 459                                 CAN_ERR_CRTL_RX_WARNING;
 460                 } else {
 461                         priv->can.can_stats.error_passive++;
 462                         cf->data[1] = (txerr > rxerr) ?
 463                                 CAN_ERR_CRTL_TX_PASSIVE :
 464                                 CAN_ERR_CRTL_RX_PASSIVE;
 465                 }
 466                 cf->data[6] = txerr;
 467                 cf->data[7] = rxerr;
 468         }
 469
 470         priv->can.state = state;
 471
 472         netif_rx(skb);
 473
 474         stats->rx_packets++;
 475         stats->rx_bytes += cf->can_dlc;
 476
 477         return 0;
 478 }
 479
 480 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 481 {
 482         struct net_device *dev = (struct net_device *)dev_id;
 483         struct sja1000_priv *priv = netdev_priv(dev);
 484         struct net_device_stats *stats = &dev->stats;
 485         uint8_t isrc, status;
 486         int n = 0;
 487
 488         /* Shared interrupts and IRQ off? */
 489         if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
 490                 return IRQ_NONE;
 491
 492         if (priv->pre_irq)
 493                 priv->pre_irq(priv);
 494
 495         while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
 496                 n++;
 497                 status = priv->read_reg(priv, REG_SR);
 498
 499                 if (isrc & IRQ_WUI)
 500                         dev_warn(dev->dev.parent, "wakeup interrupt\n");
 501
 502                 if (isrc & IRQ_TI) {
 503                         /* transmission complete interrupt */
 504                         stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf;
 505                         stats->tx_packets++;
 506                         can_get_echo_skb(dev, 0);
 507                         netif_wake_queue(dev);
 508                 }
 509                 if (isrc & IRQ_RI) {
 510                         /* receive interrupt */
 511                         while (status & SR_RBS) {
 512                                 sja1000_rx(dev);
 513                                 status = priv->read_reg(priv, REG_SR);
 514                         }
 515                 }
 516                 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
 517                         /* error interrupt */
 518                         if (sja1000_err(dev, isrc, status))
 519                                 break;
 520                 }
 521         }
 522
 523         if (priv->post_irq)
 524                 priv->post_irq(priv);
 525
 526         if (n >= SJA1000_MAX_IRQ)
 527                 dev_dbg(dev->dev.parent, "%d messages handled in ISR", n);
 528
 529         return (n) ? IRQ_HANDLED : IRQ_NONE;
 530 }
 531 EXPORT_SYMBOL_GPL(sja1000_interrupt);
 532
 533 static int sja1000_open(struct net_device *dev)
 534 {
 535         struct sja1000_priv *priv = netdev_priv(dev);
 536         int err;
 537
 538         /* set chip into reset mode */
 539         set_reset_mode(dev);
 540
 541         /* common open */
 542         err = open_candev(dev);
 543         if (err)
 544                 return err;
 545
 546         /* register interrupt handler, if not done by the device driver */
 547         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
 548                 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
 549                                   dev->name, (void *)dev);
 550                 if (err) {
 551                         close_candev(dev);
 552                         return -EAGAIN;
 553                 }
 554         }
 555
 556         /* init and start chi */
 557         sja1000_start(dev);
 558         priv->open_time = jiffies;
 559
 560         netif_start_queue(dev);
 561
 562         return 0;
 563 }
 564
 565 static int sja1000_close(struct net_device *dev)
 566 {
 567         struct sja1000_priv *priv = netdev_priv(dev);
 568
 569         netif_stop_queue(dev);
 570         set_reset_mode(dev);
 571
 572         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
 573                 free_irq(dev->irq, (void *)dev);
 574
 575         close_candev(dev);
 576
 577         priv->open_time = 0;
 578
 579         return 0;
 580 }
 581
 582 struct net_device *alloc_sja1000dev(int sizeof_priv)
 583 {
 584         struct net_device *dev;
 585         struct sja1000_priv *priv;
 586
 587         dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
 588                 SJA1000_ECHO_SKB_MAX);
 589         if (!dev)
 590                 return NULL;
 591
 592         priv = netdev_priv(dev);
 593
 594         priv->dev = dev;
 595         priv->can.bittiming_const = &sja1000_bittiming_const;
 596         priv->can.do_set_bittiming = sja1000_set_bittiming;
 597         priv->can.do_set_mode = sja1000_set_mode;
 598         priv->can.do_get_berr_counter = sja1000_get_berr_counter;
 599         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
 600                 CAN_CTRLMODE_BERR_REPORTING;
 601
 602         spin_lock_init(&priv->cmdreg_lock);
 603
 604         if (sizeof_priv)
 605                 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
 606
 607         return dev;
 608 }
 609 EXPORT_SYMBOL_GPL(alloc_sja1000dev);
 610
 611 void free_sja1000dev(struct net_device *dev)
 612 {
 613         free_candev(dev);
 614 }
 615 EXPORT_SYMBOL_GPL(free_sja1000dev);
 616
 617 static const struct net_device_ops sja1000_netdev_ops = {
 618        .ndo_open               = sja1000_open,
 619        .ndo_stop               = sja1000_close,
 620        .ndo_start_xmit         = sja1000_start_xmit,
 621 };
 622
 623 int register_sja1000dev(struct net_device *dev)
 624 {
 625         if (!sja1000_probe_chip(dev))
 626                 return -ENODEV;
 627
 628         dev->flags |= IFF_ECHO; /* we support local echo */
 629         dev->netdev_ops = &sja1000_netdev_ops;
 630
 631         set_reset_mode(dev);
 632         chipset_init(dev);
 633
 634         return register_candev(dev);
 635 }
 636 EXPORT_SYMBOL_GPL(register_sja1000dev);
 637
 638 void unregister_sja1000dev(struct net_device *dev)
 639 {
 640         set_reset_mode(dev);
 641         unregister_candev(dev);
 642 }
 643 EXPORT_SYMBOL_GPL(unregister_sja1000dev);
 644
 645 static __init int sja1000_init(void)
 646 {
 647         printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
 648
 649         return 0;
 650 }
 651
 652 module_init(sja1000_init);
 653
 654 static __exit void sja1000_exit(void)
 655 {
 656         printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
 657 }
 658
 659 module_exit(sja1000_exit);