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 #include <linux/can/led.h>
  64
  65 #include "sja1000.h"
  66
  67 #define DRV_NAME "sja1000"
  68
  69 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
  70 MODULE_LICENSE("Dual BSD/GPL");
  71 MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
  72
  73 static const struct can_bittiming_const sja1000_bittiming_const = {
  74         .name = DRV_NAME,
  75         .tseg1_min = 1,
  76         .tseg1_max = 16,
  77         .tseg2_min = 1,
  78         .tseg2_max = 8,
  79         .sjw_max = 4,
  80         .brp_min = 1,
  81         .brp_max = 64,
  82         .brp_inc = 1,
  83 };
  84
  85 static void sja1000_write_cmdreg(struct sja1000_priv *priv, u8 val)
  86 {
  87         unsigned long flags;
  88
  89         /*
  90          * The command register needs some locking and time to settle
  91          * the write_reg() operation - especially on SMP systems.
  92          */
  93         spin_lock_irqsave(&priv->cmdreg_lock, flags);
  94         priv->write_reg(priv, SJA1000_CMR, val);
  95         priv->read_reg(priv, SJA1000_SR);
  96         spin_unlock_irqrestore(&priv->cmdreg_lock, flags);
  97 }
  98
  99 static int sja1000_is_absent(struct sja1000_priv *priv)
 100 {
 101         return (priv->read_reg(priv, SJA1000_MOD) == 0xFF);
 102 }
 103
 104 static int sja1000_probe_chip(struct net_device *dev)
 105 {
 106         struct sja1000_priv *priv = netdev_priv(dev);
 107
 108         if (priv->reg_base && sja1000_is_absent(priv)) {
 109                 netdev_err(dev, "probing failed\n");
 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, SJA1000_MOD);
 119         int i;
 120
 121         /* disable interrupts */
 122         priv->write_reg(priv, SJA1000_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                 /* reset chip */
 132                 priv->write_reg(priv, SJA1000_MOD, MOD_RM);
 133                 udelay(10);
 134                 status = priv->read_reg(priv, SJA1000_MOD);
 135         }
 136
 137         netdev_err(dev, "setting SJA1000 into reset mode failed!\n");
 138 }
 139
 140 static void set_normal_mode(struct net_device *dev)
 141 {
 142         struct sja1000_priv *priv = netdev_priv(dev);
 143         unsigned char status = priv->read_reg(priv, SJA1000_MOD);
 144         int i;
 145
 146         for (i = 0; i < 100; i++) {
 147                 /* check reset bit */
 148                 if ((status & MOD_RM) == 0) {
 149                         priv->can.state = CAN_STATE_ERROR_ACTIVE;
 150                         /* enable interrupts */
 151                         if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
 152                                 priv->write_reg(priv, SJA1000_IER, IRQ_ALL);
 153                         else
 154                                 priv->write_reg(priv, SJA1000_IER,
 155                                                 IRQ_ALL & ~IRQ_BEI);
 156                         return;
 157                 }
 158
 159                 /* set chip to normal mode */
 160                 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
 161                         priv->write_reg(priv, SJA1000_MOD, MOD_LOM);
 162                 else
 163                         priv->write_reg(priv, SJA1000_MOD, 0x00);
 164
 165                 udelay(10);
 166
 167                 status = priv->read_reg(priv, SJA1000_MOD);
 168         }
 169
 170         netdev_err(dev, "setting SJA1000 into normal mode failed!\n");
 171 }
 172
 173 static void sja1000_start(struct net_device *dev)
 174 {
 175         struct sja1000_priv *priv = netdev_priv(dev);
 176
 177         /* leave reset mode */
 178         if (priv->can.state != CAN_STATE_STOPPED)
 179                 set_reset_mode(dev);
 180
 181         /* Clear error counters and error code capture */
 182         priv->write_reg(priv, SJA1000_TXERR, 0x0);
 183         priv->write_reg(priv, SJA1000_RXERR, 0x0);
 184         priv->read_reg(priv, SJA1000_ECC);
 185
 186         /* leave reset mode */
 187         set_normal_mode(dev);
 188 }
 189
 190 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
 191 {
 192         switch (mode) {
 193         case CAN_MODE_START:
 194                 sja1000_start(dev);
 195                 if (netif_queue_stopped(dev))
 196                         netif_wake_queue(dev);
 197                 break;
 198
 199         default:
 200                 return -EOPNOTSUPP;
 201         }
 202
 203         return 0;
 204 }
 205
 206 static int sja1000_set_bittiming(struct net_device *dev)
 207 {
 208         struct sja1000_priv *priv = netdev_priv(dev);
 209         struct can_bittiming *bt = &priv->can.bittiming;
 210         u8 btr0, btr1;
 211
 212         btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
 213         btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
 214                 (((bt->phase_seg2 - 1) & 0x7) << 4);
 215         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
 216                 btr1 |= 0x80;
 217
 218         netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
 219
 220         priv->write_reg(priv, SJA1000_BTR0, btr0);
 221         priv->write_reg(priv, SJA1000_BTR1, btr1);
 222
 223         return 0;
 224 }
 225
 226 static int sja1000_get_berr_counter(const struct net_device *dev,
 227                                     struct can_berr_counter *bec)
 228 {
 229         struct sja1000_priv *priv = netdev_priv(dev);
 230
 231         bec->txerr = priv->read_reg(priv, SJA1000_TXERR);
 232         bec->rxerr = priv->read_reg(priv, SJA1000_RXERR);
 233
 234         return 0;
 235 }
 236
 237 /*
 238  * initialize SJA1000 chip:
 239  *   - reset chip
 240  *   - set output mode
 241  *   - set baudrate
 242  *   - enable interrupts
 243  *   - start operating mode
 244  */
 245 static void chipset_init(struct net_device *dev)
 246 {
 247         struct sja1000_priv *priv = netdev_priv(dev);
 248
 249         /* set clock divider and output control register */
 250         priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN);
 251
 252         /* set acceptance filter (accept all) */
 253         priv->write_reg(priv, SJA1000_ACCC0, 0x00);
 254         priv->write_reg(priv, SJA1000_ACCC1, 0x00);
 255         priv->write_reg(priv, SJA1000_ACCC2, 0x00);
 256         priv->write_reg(priv, SJA1000_ACCC3, 0x00);
 257
 258         priv->write_reg(priv, SJA1000_ACCM0, 0xFF);
 259         priv->write_reg(priv, SJA1000_ACCM1, 0xFF);
 260         priv->write_reg(priv, SJA1000_ACCM2, 0xFF);
 261         priv->write_reg(priv, SJA1000_ACCM3, 0xFF);
 262
 263         priv->write_reg(priv, SJA1000_OCR, priv->ocr | OCR_MODE_NORMAL);
 264 }
 265
 266 /*
 267  * transmit a CAN message
 268  * message layout in the sk_buff should be like this:
 269  * xx xx xx xx   ff      ll   00 11 22 33 44 55 66 77
 270  * [  can-id ] [flags] [len] [can data (up to 8 bytes]
 271  */
 272 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
 273                                             struct net_device *dev)
 274 {
 275         struct sja1000_priv *priv = netdev_priv(dev);
 276         struct can_frame *cf = (struct can_frame *)skb->data;
 277         uint8_t fi;
 278         uint8_t dlc;
 279         canid_t id;
 280         uint8_t dreg;
 281         int i;
 282
 283         if (can_dropped_invalid_skb(dev, skb))
 284                 return NETDEV_TX_OK;
 285
 286         netif_stop_queue(dev);
 287
 288         fi = dlc = cf->can_dlc;
 289         id = cf->can_id;
 290
 291         if (id & CAN_RTR_FLAG)
 292                 fi |= SJA1000_FI_RTR;
 293
 294         if (id & CAN_EFF_FLAG) {
 295                 fi |= SJA1000_FI_FF;
 296                 dreg = SJA1000_EFF_BUF;
 297                 priv->write_reg(priv, SJA1000_FI, fi);
 298                 priv->write_reg(priv, SJA1000_ID1, (id & 0x1fe00000) >> 21);
 299                 priv->write_reg(priv, SJA1000_ID2, (id & 0x001fe000) >> 13);
 300                 priv->write_reg(priv, SJA1000_ID3, (id & 0x00001fe0) >> 5);
 301                 priv->write_reg(priv, SJA1000_ID4, (id & 0x0000001f) << 3);
 302         } else {
 303                 dreg = SJA1000_SFF_BUF;
 304                 priv->write_reg(priv, SJA1000_FI, fi);
 305                 priv->write_reg(priv, SJA1000_ID1, (id & 0x000007f8) >> 3);
 306                 priv->write_reg(priv, SJA1000_ID2, (id & 0x00000007) << 5);
 307         }
 308
 309         for (i = 0; i < dlc; i++)
 310                 priv->write_reg(priv, dreg++, cf->data[i]);
 311
 312         can_put_echo_skb(skb, dev, 0);
 313
 314         if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
 315                 sja1000_write_cmdreg(priv, CMD_TR | CMD_AT);
 316         else
 317                 sja1000_write_cmdreg(priv, CMD_TR);
 318
 319         return NETDEV_TX_OK;
 320 }
 321
 322 static void sja1000_rx(struct net_device *dev)
 323 {
 324         struct sja1000_priv *priv = netdev_priv(dev);
 325         struct net_device_stats *stats = &dev->stats;
 326         struct can_frame *cf;
 327         struct sk_buff *skb;
 328         uint8_t fi;
 329         uint8_t dreg;
 330         canid_t id;
 331         int i;
 332
 333         /* create zero'ed CAN frame buffer */
 334         skb = alloc_can_skb(dev, &cf);
 335         if (skb == NULL)
 336                 return;
 337
 338         fi = priv->read_reg(priv, SJA1000_FI);
 339
 340         if (fi & SJA1000_FI_FF) {
 341                 /* extended frame format (EFF) */
 342                 dreg = SJA1000_EFF_BUF;
 343                 id = (priv->read_reg(priv, SJA1000_ID1) << 21)
 344                     | (priv->read_reg(priv, SJA1000_ID2) << 13)
 345                     | (priv->read_reg(priv, SJA1000_ID3) << 5)
 346                     | (priv->read_reg(priv, SJA1000_ID4) >> 3);
 347                 id |= CAN_EFF_FLAG;
 348         } else {
 349                 /* standard frame format (SFF) */
 350                 dreg = SJA1000_SFF_BUF;
 351                 id = (priv->read_reg(priv, SJA1000_ID1) << 3)
 352                     | (priv->read_reg(priv, SJA1000_ID2) >> 5);
 353         }
 354
 355         cf->can_dlc = get_can_dlc(fi & 0x0F);
 356         if (fi & SJA1000_FI_RTR) {
 357                 id |= CAN_RTR_FLAG;
 358         } else {
 359                 for (i = 0; i < cf->can_dlc; i++)
 360                         cf->data[i] = priv->read_reg(priv, dreg++);
 361         }
 362
 363         cf->can_id = id;
 364
 365         /* release receive buffer */
 366         sja1000_write_cmdreg(priv, CMD_RRB);
 367
 368         netif_rx(skb);
 369
 370         stats->rx_packets++;
 371         stats->rx_bytes += cf->can_dlc;
 372
 373         can_led_event(dev, CAN_LED_EVENT_RX);
 374 }
 375
 376 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 377 {
 378         struct sja1000_priv *priv = netdev_priv(dev);
 379         struct net_device_stats *stats = &dev->stats;
 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                 netdev_dbg(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                 sja1000_write_cmdreg(priv, CMD_CDO);    /* clear bit */
 397         }
 398
 399         if (isrc & IRQ_EI) {
 400                 /* error warning interrupt */
 401                 netdev_dbg(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, SJA1000_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 occurred 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                 netdev_dbg(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                 netdev_dbg(dev, "arbitration lost interrupt\n");
 451                 alc = priv->read_reg(priv, SJA1000_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, SJA1000_RXERR);
 461                 uint8_t txerr = priv->read_reg(priv, SJA1000_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         stats->rx_packets++;
 483         stats->rx_bytes += cf->can_dlc;
 484
 485         return 0;
 486 }
 487
 488 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 489 {
 490         struct net_device *dev = (struct net_device *)dev_id;
 491         struct sja1000_priv *priv = netdev_priv(dev);
 492         struct net_device_stats *stats = &dev->stats;
 493         uint8_t isrc, status;
 494         int n = 0;
 495
 496         if (priv->pre_irq)
 497                 priv->pre_irq(priv);
 498
 499         /* Shared interrupts and IRQ off? */
 500         if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF)
 501                 goto out;
 502
 503         while ((isrc = priv->read_reg(priv, SJA1000_IR)) &&
 504                (n < SJA1000_MAX_IRQ)) {
 505
 506                 status = priv->read_reg(priv, SJA1000_SR);
 507                 /* check for absent controller due to hw unplug */
 508                 if (status == 0xFF && sja1000_is_absent(priv))
 509                         goto out;
 510
 511                 if (isrc & IRQ_WUI)
 512                         netdev_warn(dev, "wakeup interrupt\n");
 513
 514                 if (isrc & IRQ_TI) {
 515                         /* transmission buffer released */
 516                         if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT &&
 517                             !(status & SR_TCS)) {
 518                                 stats->tx_errors++;
 519                                 can_free_echo_skb(dev, 0);
 520                         } else {
 521                                 /* transmission complete */
 522                                 stats->tx_bytes +=
 523                                         priv->read_reg(priv, SJA1000_FI) & 0xf;
 524                                 stats->tx_packets++;
 525                                 can_get_echo_skb(dev, 0);
 526                         }
 527                         netif_wake_queue(dev);
 528                         can_led_event(dev, CAN_LED_EVENT_TX);
 529                 }
 530                 if (isrc & IRQ_RI) {
 531                         /* receive interrupt */
 532                         while (status & SR_RBS) {
 533                                 sja1000_rx(dev);
 534                                 status = priv->read_reg(priv, SJA1000_SR);
 535                                 /* check for absent controller */
 536                                 if (status == 0xFF && sja1000_is_absent(priv))
 537                                         goto out;
 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                 n++;
 546         }
 547 out:
 548         if (priv->post_irq)
 549                 priv->post_irq(priv);
 550
 551         if (n >= SJA1000_MAX_IRQ)
 552                 netdev_dbg(dev, "%d messages handled in ISR", n);
 553
 554         return (n) ? IRQ_HANDLED : IRQ_NONE;
 555 }
 556 EXPORT_SYMBOL_GPL(sja1000_interrupt);
 557
 558 static int sja1000_open(struct net_device *dev)
 559 {
 560         struct sja1000_priv *priv = netdev_priv(dev);
 561         int err;
 562
 563         /* set chip into reset mode */
 564         set_reset_mode(dev);
 565
 566         /* common open */
 567         err = open_candev(dev);
 568         if (err)
 569                 return err;
 570
 571         /* register interrupt handler, if not done by the device driver */
 572         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
 573                 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
 574                                   dev->name, (void *)dev);
 575                 if (err) {
 576                         close_candev(dev);
 577                         return -EAGAIN;
 578                 }
 579         }
 580
 581         /* init and start chi */
 582         sja1000_start(dev);
 583
 584         can_led_event(dev, CAN_LED_EVENT_OPEN);
 585
 586         netif_start_queue(dev);
 587
 588         return 0;
 589 }
 590
 591 static int sja1000_close(struct net_device *dev)
 592 {
 593         struct sja1000_priv *priv = netdev_priv(dev);
 594
 595         netif_stop_queue(dev);
 596         set_reset_mode(dev);
 597
 598         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
 599                 free_irq(dev->irq, (void *)dev);
 600
 601         close_candev(dev);
 602
 603         can_led_event(dev, CAN_LED_EVENT_STOP);
 604
 605         return 0;
 606 }
 607
 608 struct net_device *alloc_sja1000dev(int sizeof_priv)
 609 {
 610         struct net_device *dev;
 611         struct sja1000_priv *priv;
 612
 613         dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
 614                 SJA1000_ECHO_SKB_MAX);
 615         if (!dev)
 616                 return NULL;
 617
 618         priv = netdev_priv(dev);
 619
 620         priv->dev = dev;
 621         priv->can.bittiming_const = &sja1000_bittiming_const;
 622         priv->can.do_set_bittiming = sja1000_set_bittiming;
 623         priv->can.do_set_mode = sja1000_set_mode;
 624         priv->can.do_get_berr_counter = sja1000_get_berr_counter;
 625         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
 626                 CAN_CTRLMODE_BERR_REPORTING | CAN_CTRLMODE_LISTENONLY |
 627                 CAN_CTRLMODE_ONE_SHOT;
 628
 629         spin_lock_init(&priv->cmdreg_lock);
 630
 631         if (sizeof_priv)
 632                 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
 633
 634         return dev;
 635 }
 636 EXPORT_SYMBOL_GPL(alloc_sja1000dev);
 637
 638 void free_sja1000dev(struct net_device *dev)
 639 {
 640         free_candev(dev);
 641 }
 642 EXPORT_SYMBOL_GPL(free_sja1000dev);
 643
 644 static const struct net_device_ops sja1000_netdev_ops = {
 645         .ndo_open       = sja1000_open,
 646         .ndo_stop       = sja1000_close,
 647         .ndo_start_xmit = sja1000_start_xmit,
 648         .ndo_change_mtu = can_change_mtu,
 649 };
 650
 651 int register_sja1000dev(struct net_device *dev)
 652 {
 653         int ret;
 654
 655         if (!sja1000_probe_chip(dev))
 656                 return -ENODEV;
 657
 658         dev->flags |= IFF_ECHO; /* we support local echo */
 659         dev->netdev_ops = &sja1000_netdev_ops;
 660
 661         set_reset_mode(dev);
 662         chipset_init(dev);
 663
 664         ret =  register_candev(dev);
 665
 666         if (!ret)
 667                 devm_can_led_init(dev);
 668
 669         return ret;
 670 }
 671 EXPORT_SYMBOL_GPL(register_sja1000dev);
 672
 673 void unregister_sja1000dev(struct net_device *dev)
 674 {
 675         set_reset_mode(dev);
 676         unregister_candev(dev);
 677 }
 678 EXPORT_SYMBOL_GPL(unregister_sja1000dev);
 679
 680 static __init int sja1000_init(void)
 681 {
 682         printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
 683
 684         return 0;
 685 }
 686
 687 module_init(sja1000_init);
 688
 689 static __exit void sja1000_exit(void)
 690 {
 691         printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
 692 }
 693
 694 module_exit(sja1000_exit);