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 const 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_is_absent(struct sja1000_priv *priv)
  99 {
 100         return (priv->read_reg(priv, REG_MOD) == 0xFF);
 101 }
 102
 103 static int sja1000_probe_chip(struct net_device *dev)
 104 {
 105         struct sja1000_priv *priv = netdev_priv(dev);
 106
 107         if (priv->reg_base && sja1000_is_absent(priv)) {
 108                 printk(KERN_INFO "%s: probing @0x%lX failed\n",
 109                        DRV_NAME, dev->base_addr);
 110                 return 0;
 111         }
 112         return -1;
 113 }
 114
 115 static void set_reset_mode(struct net_device *dev)
 116 {
 117         struct sja1000_priv *priv = netdev_priv(dev);
 118         unsigned char status = priv->read_reg(priv, REG_MOD);
 119         int i;
 120
 121         /* disable interrupts */
 122         priv->write_reg(priv, REG_IER, IRQ_OFF);
 123
 124         for (i = 0; i < 100; i++) {
 125                 /* check reset bit */
 126                 if (status & MOD_RM) {
 127                         priv->can.state = CAN_STATE_STOPPED;
 128                         return;
 129                 }
 130
 131                 priv->write_reg(priv, REG_MOD, MOD_RM); /* reset chip */
 132                 udelay(10);
 133                 status = priv->read_reg(priv, REG_MOD);
 134         }
 135
 136         netdev_err(dev, "setting SJA1000 into reset mode failed!\n");
 137 }
 138
 139 static void set_normal_mode(struct net_device *dev)
 140 {
 141         struct sja1000_priv *priv = netdev_priv(dev);
 142         unsigned char status = priv->read_reg(priv, REG_MOD);
 143         int i;
 144
 145         for (i = 0; i < 100; i++) {
 146                 /* check reset bit */
 147                 if ((status & MOD_RM) == 0) {
 148                         priv->can.state = CAN_STATE_ERROR_ACTIVE;
 149                         /* enable interrupts */
 150                         if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
 151                                 priv->write_reg(priv, REG_IER, IRQ_ALL);
 152                         else
 153                                 priv->write_reg(priv, REG_IER,
 154                                                 IRQ_ALL & ~IRQ_BEI);
 155                         return;
 156                 }
 157
 158                 /* set chip to normal mode */
 159                 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
 160                         priv->write_reg(priv, REG_MOD, MOD_LOM);
 161                 else
 162                         priv->write_reg(priv, REG_MOD, 0x00);
 163
 164                 udelay(10);
 165
 166                 status = priv->read_reg(priv, REG_MOD);
 167         }
 168
 169         netdev_err(dev, "setting SJA1000 into normal mode failed!\n");
 170 }
 171
 172 static void sja1000_start(struct net_device *dev)
 173 {
 174         struct sja1000_priv *priv = netdev_priv(dev);
 175
 176         /* leave reset mode */
 177         if (priv->can.state != CAN_STATE_STOPPED)
 178                 set_reset_mode(dev);
 179
 180         /* Clear error counters and error code capture */
 181         priv->write_reg(priv, REG_TXERR, 0x0);
 182         priv->write_reg(priv, REG_RXERR, 0x0);
 183         priv->read_reg(priv, REG_ECC);
 184
 185         /* leave reset mode */
 186         set_normal_mode(dev);
 187 }
 188
 189 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
 190 {
 191         struct sja1000_priv *priv = netdev_priv(dev);
 192
 193         if (!priv->open_time)
 194                 return -EINVAL;
 195
 196         switch (mode) {
 197         case CAN_MODE_START:
 198                 sja1000_start(dev);
 199                 if (netif_queue_stopped(dev))
 200                         netif_wake_queue(dev);
 201                 break;
 202
 203         default:
 204                 return -EOPNOTSUPP;
 205         }
 206
 207         return 0;
 208 }
 209
 210 static int sja1000_set_bittiming(struct net_device *dev)
 211 {
 212         struct sja1000_priv *priv = netdev_priv(dev);
 213         struct can_bittiming *bt = &priv->can.bittiming;
 214         u8 btr0, btr1;
 215
 216         btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
 217         btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
 218                 (((bt->phase_seg2 - 1) & 0x7) << 4);
 219         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
 220                 btr1 |= 0x80;
 221
 222         netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
 223
 224         priv->write_reg(priv, REG_BTR0, btr0);
 225         priv->write_reg(priv, REG_BTR1, btr1);
 226
 227         return 0;
 228 }
 229
 230 static int sja1000_get_berr_counter(const struct net_device *dev,
 231                                     struct can_berr_counter *bec)
 232 {
 233         struct sja1000_priv *priv = netdev_priv(dev);
 234
 235         bec->txerr = priv->read_reg(priv, REG_TXERR);
 236         bec->rxerr = priv->read_reg(priv, REG_RXERR);
 237
 238         return 0;
 239 }
 240
 241 /*
 242  * initialize SJA1000 chip:
 243  *   - reset chip
 244  *   - set output mode
 245  *   - set baudrate
 246  *   - enable interrupts
 247  *   - start operating mode
 248  */
 249 static void chipset_init(struct net_device *dev)
 250 {
 251         struct sja1000_priv *priv = netdev_priv(dev);
 252
 253         /* set clock divider and output control register */
 254         priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN);
 255
 256         /* set acceptance filter (accept all) */
 257         priv->write_reg(priv, REG_ACCC0, 0x00);
 258         priv->write_reg(priv, REG_ACCC1, 0x00);
 259         priv->write_reg(priv, REG_ACCC2, 0x00);
 260         priv->write_reg(priv, REG_ACCC3, 0x00);
 261
 262         priv->write_reg(priv, REG_ACCM0, 0xFF);
 263         priv->write_reg(priv, REG_ACCM1, 0xFF);
 264         priv->write_reg(priv, REG_ACCM2, 0xFF);
 265         priv->write_reg(priv, REG_ACCM3, 0xFF);
 266
 267         priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL);
 268 }
 269
 270 /*
 271  * transmit a CAN message
 272  * message layout in the sk_buff should be like this:
 273  * xx xx xx xx   ff      ll   00 11 22 33 44 55 66 77
 274  * [  can-id ] [flags] [len] [can data (up to 8 bytes]
 275  */
 276 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
 277                                             struct net_device *dev)
 278 {
 279         struct sja1000_priv *priv = netdev_priv(dev);
 280         struct can_frame *cf = (struct can_frame *)skb->data;
 281         uint8_t fi;
 282         uint8_t dlc;
 283         canid_t id;
 284         uint8_t dreg;
 285         int i;
 286
 287         if (can_dropped_invalid_skb(dev, skb))
 288                 return NETDEV_TX_OK;
 289
 290         netif_stop_queue(dev);
 291
 292         fi = dlc = cf->can_dlc;
 293         id = cf->can_id;
 294
 295         if (id & CAN_RTR_FLAG)
 296                 fi |= FI_RTR;
 297
 298         if (id & CAN_EFF_FLAG) {
 299                 fi |= FI_FF;
 300                 dreg = EFF_BUF;
 301                 priv->write_reg(priv, REG_FI, fi);
 302                 priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
 303                 priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8));
 304                 priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5);
 305                 priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3);
 306         } else {
 307                 dreg = SFF_BUF;
 308                 priv->write_reg(priv, REG_FI, fi);
 309                 priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3);
 310                 priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5);
 311         }
 312
 313         for (i = 0; i < dlc; i++)
 314                 priv->write_reg(priv, dreg++, cf->data[i]);
 315
 316         can_put_echo_skb(skb, dev, 0);
 317
 318         if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
 319                 sja1000_write_cmdreg(priv, CMD_TR | CMD_AT);
 320         else
 321                 sja1000_write_cmdreg(priv, CMD_TR);
 322
 323         return NETDEV_TX_OK;
 324 }
 325
 326 static void sja1000_rx(struct net_device *dev)
 327 {
 328         struct sja1000_priv *priv = netdev_priv(dev);
 329         struct net_device_stats *stats = &dev->stats;
 330         struct can_frame *cf;
 331         struct sk_buff *skb;
 332         uint8_t fi;
 333         uint8_t dreg;
 334         canid_t id;
 335         int i;
 336
 337         /* create zero'ed CAN frame buffer */
 338         skb = alloc_can_skb(dev, &cf);
 339         if (skb == NULL)
 340                 return;
 341
 342         fi = priv->read_reg(priv, REG_FI);
 343
 344         if (fi & FI_FF) {
 345                 /* extended frame format (EFF) */
 346                 dreg = EFF_BUF;
 347                 id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
 348                     | (priv->read_reg(priv, REG_ID2) << (5 + 8))
 349                     | (priv->read_reg(priv, REG_ID3) << 5)
 350                     | (priv->read_reg(priv, REG_ID4) >> 3);
 351                 id |= CAN_EFF_FLAG;
 352         } else {
 353                 /* standard frame format (SFF) */
 354                 dreg = SFF_BUF;
 355                 id = (priv->read_reg(priv, REG_ID1) << 3)
 356                     | (priv->read_reg(priv, REG_ID2) >> 5);
 357         }
 358
 359         cf->can_dlc = get_can_dlc(fi & 0x0F);
 360         if (fi & FI_RTR) {
 361                 id |= CAN_RTR_FLAG;
 362         } else {
 363                 for (i = 0; i < cf->can_dlc; i++)
 364                         cf->data[i] = priv->read_reg(priv, dreg++);
 365         }
 366
 367         cf->can_id = id;
 368
 369         /* release receive buffer */
 370         sja1000_write_cmdreg(priv, CMD_RRB);
 371
 372         netif_rx(skb);
 373
 374         stats->rx_packets++;
 375         stats->rx_bytes += cf->can_dlc;
 376 }
 377
 378 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 379 {
 380         struct sja1000_priv *priv = netdev_priv(dev);
 381         struct net_device_stats *stats = &dev->stats;
 382         struct can_frame *cf;
 383         struct sk_buff *skb;
 384         enum can_state state = priv->can.state;
 385         uint8_t ecc, alc;
 386
 387         skb = alloc_can_err_skb(dev, &cf);
 388         if (skb == NULL)
 389                 return -ENOMEM;
 390
 391         if (isrc & IRQ_DOI) {
 392                 /* data overrun interrupt */
 393                 netdev_dbg(dev, "data overrun interrupt\n");
 394                 cf->can_id |= CAN_ERR_CRTL;
 395                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 396                 stats->rx_over_errors++;
 397                 stats->rx_errors++;
 398                 sja1000_write_cmdreg(priv, CMD_CDO);    /* clear bit */
 399         }
 400
 401         if (isrc & IRQ_EI) {
 402                 /* error warning interrupt */
 403                 netdev_dbg(dev, "error warning interrupt\n");
 404
 405                 if (status & SR_BS) {
 406                         state = CAN_STATE_BUS_OFF;
 407                         cf->can_id |= CAN_ERR_BUSOFF;
 408                         can_bus_off(dev);
 409                 } else if (status & SR_ES) {
 410                         state = CAN_STATE_ERROR_WARNING;
 411                 } else
 412                         state = CAN_STATE_ERROR_ACTIVE;
 413         }
 414         if (isrc & IRQ_BEI) {
 415                 /* bus error interrupt */
 416                 priv->can.can_stats.bus_error++;
 417                 stats->rx_errors++;
 418
 419                 ecc = priv->read_reg(priv, REG_ECC);
 420
 421                 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 422
 423                 switch (ecc & ECC_MASK) {
 424                 case ECC_BIT:
 425                         cf->data[2] |= CAN_ERR_PROT_BIT;
 426                         break;
 427                 case ECC_FORM:
 428                         cf->data[2] |= CAN_ERR_PROT_FORM;
 429                         break;
 430                 case ECC_STUFF:
 431                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 432                         break;
 433                 default:
 434                         cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 435                         cf->data[3] = ecc & ECC_SEG;
 436                         break;
 437                 }
 438                 /* Error occurred during transmission? */
 439                 if ((ecc & ECC_DIR) == 0)
 440                         cf->data[2] |= CAN_ERR_PROT_TX;
 441         }
 442         if (isrc & IRQ_EPI) {
 443                 /* error passive interrupt */
 444                 netdev_dbg(dev, "error passive interrupt\n");
 445                 if (status & SR_ES)
 446                         state = CAN_STATE_ERROR_PASSIVE;
 447                 else
 448                         state = CAN_STATE_ERROR_ACTIVE;
 449         }
 450         if (isrc & IRQ_ALI) {
 451                 /* arbitration lost interrupt */
 452                 netdev_dbg(dev, "arbitration lost interrupt\n");
 453                 alc = priv->read_reg(priv, REG_ALC);
 454                 priv->can.can_stats.arbitration_lost++;
 455                 stats->tx_errors++;
 456                 cf->can_id |= CAN_ERR_LOSTARB;
 457                 cf->data[0] = alc & 0x1f;
 458         }
 459
 460         if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
 461                                          state == CAN_STATE_ERROR_PASSIVE)) {
 462                 uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
 463                 uint8_t txerr = priv->read_reg(priv, REG_TXERR);
 464                 cf->can_id |= CAN_ERR_CRTL;
 465                 if (state == CAN_STATE_ERROR_WARNING) {
 466                         priv->can.can_stats.error_warning++;
 467                         cf->data[1] = (txerr > rxerr) ?
 468                                 CAN_ERR_CRTL_TX_WARNING :
 469                                 CAN_ERR_CRTL_RX_WARNING;
 470                 } else {
 471                         priv->can.can_stats.error_passive++;
 472                         cf->data[1] = (txerr > rxerr) ?
 473                                 CAN_ERR_CRTL_TX_PASSIVE :
 474                                 CAN_ERR_CRTL_RX_PASSIVE;
 475                 }
 476                 cf->data[6] = txerr;
 477                 cf->data[7] = rxerr;
 478         }
 479
 480         priv->can.state = state;
 481
 482         netif_rx(skb);
 483
 484         stats->rx_packets++;
 485         stats->rx_bytes += cf->can_dlc;
 486
 487         return 0;
 488 }
 489
 490 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 491 {
 492         struct net_device *dev = (struct net_device *)dev_id;
 493         struct sja1000_priv *priv = netdev_priv(dev);
 494         struct net_device_stats *stats = &dev->stats;
 495         uint8_t isrc, status;
 496         int n = 0;
 497
 498         /* Shared interrupts and IRQ off? */
 499         if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
 500                 return IRQ_NONE;
 501
 502         if (priv->pre_irq)
 503                 priv->pre_irq(priv);
 504
 505         while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
 506                 n++;
 507                 status = priv->read_reg(priv, REG_SR);
 508                 /* check for absent controller due to hw unplug */
 509                 if (status == 0xFF && sja1000_is_absent(priv))
 510                         return IRQ_NONE;
 511
 512                 if (isrc & IRQ_WUI)
 513                         netdev_warn(dev, "wakeup interrupt\n");
 514
 515                 if (isrc & IRQ_TI) {
 516                         /* transmission buffer released */
 517                         if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT &&
 518                             !(status & SR_TCS)) {
 519                                 stats->tx_errors++;
 520                                 can_free_echo_skb(dev, 0);
 521                         } else {
 522                                 /* transmission complete */
 523                                 stats->tx_bytes +=
 524                                         priv->read_reg(priv, REG_FI) & 0xf;
 525                                 stats->tx_packets++;
 526                                 can_get_echo_skb(dev, 0);
 527                         }
 528                         netif_wake_queue(dev);
 529                 }
 530                 if (isrc & IRQ_RI) {
 531                         /* receive interrupt */
 532                         while (status & SR_RBS) {
 533                                 sja1000_rx(dev);
 534                                 status = priv->read_reg(priv, REG_SR);
 535                                 /* check for absent controller */
 536                                 if (status == 0xFF && sja1000_is_absent(priv))
 537                                         return IRQ_NONE;
 538                         }
 539                 }
 540                 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
 541                         /* error interrupt */
 542                         if (sja1000_err(dev, isrc, status))
 543                                 break;
 544                 }
 545         }
 546
 547         if (priv->post_irq)
 548                 priv->post_irq(priv);
 549
 550         if (n >= SJA1000_MAX_IRQ)
 551                 netdev_dbg(dev, "%d messages handled in ISR", n);
 552
 553         return (n) ? IRQ_HANDLED : IRQ_NONE;
 554 }
 555 EXPORT_SYMBOL_GPL(sja1000_interrupt);
 556
 557 static int sja1000_open(struct net_device *dev)
 558 {
 559         struct sja1000_priv *priv = netdev_priv(dev);
 560         int err;
 561
 562         /* set chip into reset mode */
 563         set_reset_mode(dev);
 564
 565         /* common open */
 566         err = open_candev(dev);
 567         if (err)
 568                 return err;
 569
 570         /* register interrupt handler, if not done by the device driver */
 571         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
 572                 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
 573                                   dev->name, (void *)dev);
 574                 if (err) {
 575                         close_candev(dev);
 576                         return -EAGAIN;
 577                 }
 578         }
 579
 580         /* init and start chi */
 581         sja1000_start(dev);
 582         priv->open_time = jiffies;
 583
 584         netif_start_queue(dev);
 585
 586         return 0;
 587 }
 588
 589 static int sja1000_close(struct net_device *dev)
 590 {
 591         struct sja1000_priv *priv = netdev_priv(dev);
 592
 593         netif_stop_queue(dev);
 594         set_reset_mode(dev);
 595
 596         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
 597                 free_irq(dev->irq, (void *)dev);
 598
 599         close_candev(dev);
 600
 601         priv->open_time = 0;
 602
 603         return 0;
 604 }
 605
 606 struct net_device *alloc_sja1000dev(int sizeof_priv)
 607 {
 608         struct net_device *dev;
 609         struct sja1000_priv *priv;
 610
 611         dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
 612                 SJA1000_ECHO_SKB_MAX);
 613         if (!dev)
 614                 return NULL;
 615
 616         priv = netdev_priv(dev);
 617
 618         priv->dev = dev;
 619         priv->can.bittiming_const = &sja1000_bittiming_const;
 620         priv->can.do_set_bittiming = sja1000_set_bittiming;
 621         priv->can.do_set_mode = sja1000_set_mode;
 622         priv->can.do_get_berr_counter = sja1000_get_berr_counter;
 623         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
 624                 CAN_CTRLMODE_BERR_REPORTING | CAN_CTRLMODE_LISTENONLY |
 625                 CAN_CTRLMODE_ONE_SHOT;
 626
 627         spin_lock_init(&priv->cmdreg_lock);
 628
 629         if (sizeof_priv)
 630                 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
 631
 632         return dev;
 633 }
 634 EXPORT_SYMBOL_GPL(alloc_sja1000dev);
 635
 636 void free_sja1000dev(struct net_device *dev)
 637 {
 638         free_candev(dev);
 639 }
 640 EXPORT_SYMBOL_GPL(free_sja1000dev);
 641
 642 static const struct net_device_ops sja1000_netdev_ops = {
 643        .ndo_open               = sja1000_open,
 644        .ndo_stop               = sja1000_close,
 645        .ndo_start_xmit         = sja1000_start_xmit,
 646 };
 647
 648 int register_sja1000dev(struct net_device *dev)
 649 {
 650         if (!sja1000_probe_chip(dev))
 651                 return -ENODEV;
 652
 653         dev->flags |= IFF_ECHO; /* we support local echo */
 654         dev->netdev_ops = &sja1000_netdev_ops;
 655
 656         set_reset_mode(dev);
 657         chipset_init(dev);
 658
 659         return register_candev(dev);
 660 }
 661 EXPORT_SYMBOL_GPL(register_sja1000dev);
 662
 663 void unregister_sja1000dev(struct net_device *dev)
 664 {
 665         set_reset_mode(dev);
 666         unregister_candev(dev);
 667 }
 668 EXPORT_SYMBOL_GPL(unregister_sja1000dev);
 669
 670 static __init int sja1000_init(void)
 671 {
 672         printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
 673
 674         return 0;
 675 }
 676
 677 module_init(sja1000_init);
 678
 679 static __exit void sja1000_exit(void)
 680 {
 681         printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
 682 }
 683
 684 module_exit(sja1000_exit);