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 interrupts */
 138                         if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
 139                                 priv->write_reg(priv, REG_IER, IRQ_ALL);
 140                         else
 141                                 priv->write_reg(priv, REG_IER,
 142                                                 IRQ_ALL & ~IRQ_BEI);
 143                         return;
 144                 }
 145
 146                 /* set chip to normal mode */
 147                 priv->write_reg(priv, REG_MOD, 0x00);
 148                 udelay(10);
 149                 status = priv->read_reg(priv, REG_MOD);
 150         }
 151
 152         dev_err(ND2D(dev), "setting SJA1000 into normal mode failed!\n");
 153 }
 154
 155 static void sja1000_start(struct net_device *dev)
 156 {
 157         struct sja1000_priv *priv = netdev_priv(dev);
 158
 159         /* leave reset mode */
 160         if (priv->can.state != CAN_STATE_STOPPED)
 161                 set_reset_mode(dev);
 162
 163         /* Clear error counters and error code capture */
 164         priv->write_reg(priv, REG_TXERR, 0x0);
 165         priv->write_reg(priv, REG_RXERR, 0x0);
 166         priv->read_reg(priv, REG_ECC);
 167
 168         /* leave reset mode */
 169         set_normal_mode(dev);
 170 }
 171
 172 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
 173 {
 174         struct sja1000_priv *priv = netdev_priv(dev);
 175
 176         if (!priv->open_time)
 177                 return -EINVAL;
 178
 179         switch (mode) {
 180         case CAN_MODE_START:
 181                 sja1000_start(dev);
 182                 if (netif_queue_stopped(dev))
 183                         netif_wake_queue(dev);
 184                 break;
 185
 186         default:
 187                 return -EOPNOTSUPP;
 188         }
 189
 190         return 0;
 191 }
 192
 193 static int sja1000_set_bittiming(struct net_device *dev)
 194 {
 195         struct sja1000_priv *priv = netdev_priv(dev);
 196         struct can_bittiming *bt = &priv->can.bittiming;
 197         u8 btr0, btr1;
 198
 199         btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
 200         btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
 201                 (((bt->phase_seg2 - 1) & 0x7) << 4);
 202         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
 203                 btr1 |= 0x80;
 204
 205         dev_info(ND2D(dev),
 206                  "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
 207
 208         priv->write_reg(priv, REG_BTR0, btr0);
 209         priv->write_reg(priv, REG_BTR1, btr1);
 210
 211         return 0;
 212 }
 213
 214 static int sja1000_get_berr_counter(const struct net_device *dev,
 215                                     struct can_berr_counter *bec)
 216 {
 217         struct sja1000_priv *priv = netdev_priv(dev);
 218
 219         bec->txerr = priv->read_reg(priv, REG_TXERR);
 220         bec->rxerr = priv->read_reg(priv, REG_RXERR);
 221
 222         return 0;
 223 }
 224
 225 /*
 226  * initialize SJA1000 chip:
 227  *   - reset chip
 228  *   - set output mode
 229  *   - set baudrate
 230  *   - enable interrupts
 231  *   - start operating mode
 232  */
 233 static void chipset_init(struct net_device *dev)
 234 {
 235         struct sja1000_priv *priv = netdev_priv(dev);
 236
 237         /* set clock divider and output control register */
 238         priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN);
 239
 240         /* set acceptance filter (accept all) */
 241         priv->write_reg(priv, REG_ACCC0, 0x00);
 242         priv->write_reg(priv, REG_ACCC1, 0x00);
 243         priv->write_reg(priv, REG_ACCC2, 0x00);
 244         priv->write_reg(priv, REG_ACCC3, 0x00);
 245
 246         priv->write_reg(priv, REG_ACCM0, 0xFF);
 247         priv->write_reg(priv, REG_ACCM1, 0xFF);
 248         priv->write_reg(priv, REG_ACCM2, 0xFF);
 249         priv->write_reg(priv, REG_ACCM3, 0xFF);
 250
 251         priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL);
 252 }
 253
 254 /*
 255  * transmit a CAN message
 256  * message layout in the sk_buff should be like this:
 257  * xx xx xx xx   ff      ll   00 11 22 33 44 55 66 77
 258  * [  can-id ] [flags] [len] [can data (up to 8 bytes]
 259  */
 260 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
 261 static int sja1000_start_xmit(struct sk_buff *skb, struct net_device *dev)
 262 #else
 263 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
 264                                       struct net_device *dev)
 265 #endif
 266 {
 267         struct sja1000_priv *priv = netdev_priv(dev);
 268         struct can_frame *cf = (struct can_frame *)skb->data;
 269         uint8_t fi;
 270         uint8_t dlc;
 271         canid_t id;
 272         uint8_t dreg;
 273         int i;
 274
 275         if (can_dropped_invalid_skb(dev, skb))
 276                 return NETDEV_TX_OK;
 277
 278         netif_stop_queue(dev);
 279
 280         fi = dlc = cf->can_dlc;
 281         id = cf->can_id;
 282
 283         if (id & CAN_RTR_FLAG)
 284                 fi |= FI_RTR;
 285
 286         if (id & CAN_EFF_FLAG) {
 287                 fi |= FI_FF;
 288                 dreg = EFF_BUF;
 289                 priv->write_reg(priv, REG_FI, fi);
 290                 priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
 291                 priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8));
 292                 priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5);
 293                 priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3);
 294         } else {
 295                 dreg = SFF_BUF;
 296                 priv->write_reg(priv, REG_FI, fi);
 297                 priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3);
 298                 priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5);
 299         }
 300
 301         for (i = 0; i < dlc; i++)
 302                 priv->write_reg(priv, dreg++, cf->data[i]);
 303
 304         dev->trans_start = jiffies;
 305
 306         can_put_echo_skb(skb, dev, 0);
 307
 308         priv->write_reg(priv, REG_CMR, CMD_TR);
 309
 310         return NETDEV_TX_OK;
 311 }
 312
 313 static void sja1000_rx(struct net_device *dev)
 314 {
 315         struct sja1000_priv *priv = netdev_priv(dev);
 316 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
 317         struct net_device_stats *stats = can_get_stats(dev);
 318 #else
 319         struct net_device_stats *stats = &dev->stats;
 320 #endif
 321         struct can_frame *cf;
 322         struct sk_buff *skb;
 323         uint8_t fi;
 324         uint8_t dreg;
 325         canid_t id;
 326         int i;
 327
 328         /* create zero'ed CAN frame buffer */
 329         skb = alloc_can_skb(dev, &cf);
 330         if (skb == NULL)
 331                 return;
 332
 333         fi = priv->read_reg(priv, REG_FI);
 334
 335         if (fi & FI_FF) {
 336                 /* extended frame format (EFF) */
 337                 dreg = EFF_BUF;
 338                 id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
 339                     | (priv->read_reg(priv, REG_ID2) << (5 + 8))
 340                     | (priv->read_reg(priv, REG_ID3) << 5)
 341                     | (priv->read_reg(priv, REG_ID4) >> 3);
 342                 id |= CAN_EFF_FLAG;
 343         } else {
 344                 /* standard frame format (SFF) */
 345                 dreg = SFF_BUF;
 346                 id = (priv->read_reg(priv, REG_ID1) << 3)
 347                     | (priv->read_reg(priv, REG_ID2) >> 5);
 348         }
 349
 350         if (fi & FI_RTR) {
 351                 id |= CAN_RTR_FLAG;
 352         } else {
 353                 cf->can_dlc = get_can_dlc(fi & 0x0F);
 354                 for (i = 0; i < cf->can_dlc; i++)
 355                         cf->data[i] = priv->read_reg(priv, dreg++);
 356         }
 357
 358         cf->can_id = id;
 359
 360         /* release receive buffer */
 361         priv->write_reg(priv, REG_CMR, CMD_RRB);
 362
 363         netif_rx(skb);
 364
 365 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
 366         dev->last_rx = jiffies;
 367 #endif
 368         stats->rx_packets++;
 369         stats->rx_bytes += cf->can_dlc;
 370 }
 371
 372 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 373 {
 374         struct sja1000_priv *priv = netdev_priv(dev);
 375 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
 376         struct net_device_stats *stats = can_get_stats(dev);
 377 #else
 378         struct net_device_stats *stats = &dev->stats;
 379 #endif
 380         struct can_frame *cf;
 381         struct sk_buff *skb;
 382         enum can_state state = priv->can.state;
 383         uint8_t ecc, alc;
 384
 385         skb = alloc_can_err_skb(dev, &cf);
 386         if (skb == NULL)
 387                 return -ENOMEM;
 388
 389         if (isrc & IRQ_DOI) {
 390                 /* data overrun interrupt */
 391                 dev_dbg(ND2D(dev), "data overrun interrupt\n");
 392                 cf->can_id |= CAN_ERR_CRTL;
 393                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 394                 stats->rx_over_errors++;
 395                 stats->rx_errors++;
 396                 priv->write_reg(priv, REG_CMR, CMD_CDO);        /* clear bit */
 397         }
 398
 399         if (isrc & IRQ_EI) {
 400                 /* error warning interrupt */
 401                 dev_dbg(ND2D(dev), "error warning interrupt\n");
 402
 403                 if (status & SR_BS) {
 404                         state = CAN_STATE_BUS_OFF;
 405                         cf->can_id |= CAN_ERR_BUSOFF;
 406                         can_bus_off(dev);
 407                 } else if (status & SR_ES) {
 408                         state = CAN_STATE_ERROR_WARNING;
 409                 } else
 410                         state = CAN_STATE_ERROR_ACTIVE;
 411         }
 412         if (isrc & IRQ_BEI) {
 413                 /* bus error interrupt */
 414                 priv->can.can_stats.bus_error++;
 415                 stats->rx_errors++;
 416
 417                 ecc = priv->read_reg(priv, REG_ECC);
 418
 419                 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 420
 421                 switch (ecc & ECC_MASK) {
 422                 case ECC_BIT:
 423                         cf->data[2] |= CAN_ERR_PROT_BIT;
 424                         break;
 425                 case ECC_FORM:
 426                         cf->data[2] |= CAN_ERR_PROT_FORM;
 427                         break;
 428                 case ECC_STUFF:
 429                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 430                         break;
 431                 default:
 432                         cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 433                         cf->data[3] = ecc & ECC_SEG;
 434                         break;
 435                 }
 436                 /* Error occured during transmission? */
 437                 if ((ecc & ECC_DIR) == 0)
 438                         cf->data[2] |= CAN_ERR_PROT_TX;
 439         }
 440         if (isrc & IRQ_EPI) {
 441                 /* error passive interrupt */
 442                 dev_dbg(ND2D(dev), "error passive interrupt\n");
 443                 if (status & SR_ES)
 444                         state = CAN_STATE_ERROR_PASSIVE;
 445                 else
 446                         state = CAN_STATE_ERROR_ACTIVE;
 447         }
 448         if (isrc & IRQ_ALI) {
 449                 /* arbitration lost interrupt */
 450                 dev_dbg(ND2D(dev), "arbitration lost interrupt\n");
 451                 alc = priv->read_reg(priv, REG_ALC);
 452                 priv->can.can_stats.arbitration_lost++;
 453                 stats->tx_errors++;
 454                 cf->can_id |= CAN_ERR_LOSTARB;
 455                 cf->data[0] = alc & 0x1f;
 456         }
 457
 458         if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
 459                                          state == CAN_STATE_ERROR_PASSIVE)) {
 460                 uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
 461                 uint8_t txerr = priv->read_reg(priv, REG_TXERR);
 462                 cf->can_id |= CAN_ERR_CRTL;
 463                 if (state == CAN_STATE_ERROR_WARNING) {
 464                         priv->can.can_stats.error_warning++;
 465                         cf->data[1] = (txerr > rxerr) ?
 466                                 CAN_ERR_CRTL_TX_WARNING :
 467                                 CAN_ERR_CRTL_RX_WARNING;
 468                 } else {
 469                         priv->can.can_stats.error_passive++;
 470                         cf->data[1] = (txerr > rxerr) ?
 471                                 CAN_ERR_CRTL_TX_PASSIVE :
 472                                 CAN_ERR_CRTL_RX_PASSIVE;
 473                 }
 474                 cf->data[6] = txerr;
 475                 cf->data[7] = rxerr;
 476         }
 477
 478         priv->can.state = state;
 479
 480         netif_rx(skb);
 481
 482 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
 483         dev->last_rx = jiffies;
 484 #endif
 485         stats->rx_packets++;
 486         stats->rx_bytes += cf->can_dlc;
 487
 488         return 0;
 489 }
 490
 491 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
 492 irqreturn_t sja1000_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 493 #else
 494 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 495 #endif
 496 {
 497         struct net_device *dev = (struct net_device *)dev_id;
 498         struct sja1000_priv *priv = netdev_priv(dev);
 499 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
 500         struct net_device_stats *stats = can_get_stats(dev);
 501 #else
 502         struct net_device_stats *stats = &dev->stats;
 503 #endif
 504         uint8_t isrc, status;
 505         int n = 0;
 506
 507         /* Shared interrupts and IRQ off? */
 508         if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
 509                 return IRQ_NONE;
 510
 511         if (priv->pre_irq)
 512                 priv->pre_irq(priv);
 513
 514         while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
 515                 n++;
 516                 status = priv->read_reg(priv, REG_SR);
 517
 518                 if (isrc & IRQ_WUI)
 519                         dev_warn(ND2D(dev), "wakeup interrupt\n");
 520
 521                 if (isrc & IRQ_TI) {
 522                         /* transmission complete interrupt */
 523                         stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf;
 524                         stats->tx_packets++;
 525                         can_get_echo_skb(dev, 0);
 526                         netif_wake_queue(dev);
 527                 }
 528                 if (isrc & IRQ_RI) {
 529                         /* receive interrupt */
 530                         while (status & SR_RBS) {
 531                                 sja1000_rx(dev);
 532                                 status = priv->read_reg(priv, REG_SR);
 533                         }
 534                 }
 535                 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
 536                         /* error interrupt */
 537                         if (sja1000_err(dev, isrc, status))
 538                                 break;
 539                 }
 540         }
 541
 542         if (priv->post_irq)
 543                 priv->post_irq(priv);
 544
 545         if (n >= SJA1000_MAX_IRQ)
 546                 dev_dbg(ND2D(dev), "%d messages handled in ISR", n);
 547
 548         return (n) ? IRQ_HANDLED : IRQ_NONE;
 549 }
 550 EXPORT_SYMBOL_GPL(sja1000_interrupt);
 551
 552 static int sja1000_open(struct net_device *dev)
 553 {
 554         struct sja1000_priv *priv = netdev_priv(dev);
 555         int err;
 556
 557         /* set chip into reset mode */
 558         set_reset_mode(dev);
 559
 560         /* common open */
 561         err = open_candev(dev);
 562         if (err)
 563                 return err;
 564
 565         /* register interrupt handler, if not done by the device driver */
 566         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
 567                 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
 568                                   dev->name, (void *)dev);
 569                 if (err) {
 570                         close_candev(dev);
 571                         return -EAGAIN;
 572                 }
 573         }
 574
 575 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
 576         /* clear statistics */
 577         memset(&priv->can.net_stats, 0, sizeof(priv->can.net_stats));
 578 #endif
 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;
 625
 626         if (sizeof_priv)
 627                 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
 628
 629         return dev;
 630 }
 631 EXPORT_SYMBOL_GPL(alloc_sja1000dev);
 632
 633 void free_sja1000dev(struct net_device *dev)
 634 {
 635         free_candev(dev);
 636 }
 637 EXPORT_SYMBOL_GPL(free_sja1000dev);
 638
 639 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,28)
 640 static const struct net_device_ops sja1000_netdev_ops = {
 641         .ndo_open = sja1000_open,
 642         .ndo_stop = sja1000_close,
 643         .ndo_start_xmit = sja1000_start_xmit,
 644 };
 645 #endif
 646
 647 int register_sja1000dev(struct net_device *dev)
 648 {
 649         if (!sja1000_probe_chip(dev))
 650                 return -ENODEV;
 651
 652         dev->flags |= IFF_ECHO; /* we support local echo */
 653 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,28)
 654         dev->netdev_ops = &sja1000_netdev_ops;
 655 #else
 656         dev->open = sja1000_open;
 657         dev->stop = sja1000_close;
 658         dev->hard_start_xmit = sja1000_start_xmit;
 659 #endif
 660
 661         set_reset_mode(dev);
 662         chipset_init(dev);
 663
 664         return register_candev(dev);
 665 }
 666 EXPORT_SYMBOL_GPL(register_sja1000dev);
 667
 668 void unregister_sja1000dev(struct net_device *dev)
 669 {
 670         set_reset_mode(dev);
 671         unregister_candev(dev);
 672 }
 673 EXPORT_SYMBOL_GPL(unregister_sja1000dev);
 674
 675 static __init int sja1000_init(void)
 676 {
 677         printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
 678
 679         return 0;
 680 }
 681
 682 module_init(sja1000_init);
 683
 684 static __exit void sja1000_exit(void)
 685 {
 686         printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
 687 }
 688
 689 module_exit(sja1000_exit);