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, SJA1000_CMR, val); 94 priv->read_reg(priv, SJA1000_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, SJA1000_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 netdev_err(dev, "probing failed\n"); 109 return 0; 110 } 111 return -1; 112 } 113 114 static void set_reset_mode(struct net_device *dev) 115 { 116 struct sja1000_priv *priv = netdev_priv(dev); 117 unsigned char status = priv->read_reg(priv, SJA1000_MOD); 118 int i; 119 120 /* disable interrupts */ 121 priv->write_reg(priv, SJA1000_IER, IRQ_OFF); 122 123 for (i = 0; i < 100; i++) { 124 /* check reset bit */ 125 if (status & MOD_RM) { 126 priv->can.state = CAN_STATE_STOPPED; 127 return; 128 } 129 130 /* reset chip */ 131 priv->write_reg(priv, SJA1000_MOD, MOD_RM); 132 udelay(10); 133 status = priv->read_reg(priv, SJA1000_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, SJA1000_MOD); 143 u8 mod_reg_val = 0x00; 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 mod_reg_val |= MOD_LOM; 162 if (priv->can.ctrlmode & CAN_CTRLMODE_PRESUME_ACK) 163 mod_reg_val |= MOD_STM; 164 priv->write_reg(priv, SJA1000_MOD, mod_reg_val); 165 166 udelay(10); 167 168 status = priv->read_reg(priv, SJA1000_MOD); 169 } 170 171 netdev_err(dev, "setting SJA1000 into normal mode failed!\n"); 172 } 173 174 /* 175 * initialize SJA1000 chip: 176 * - reset chip 177 * - set output mode 178 * - set baudrate 179 * - enable interrupts 180 * - start operating mode 181 */ 182 static void chipset_init(struct net_device *dev) 183 { 184 struct sja1000_priv *priv = netdev_priv(dev); 185 186 /* set clock divider and output control register */ 187 priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN); 188 189 /* set acceptance filter (accept all) */ 190 priv->write_reg(priv, SJA1000_ACCC0, 0x00); 191 priv->write_reg(priv, SJA1000_ACCC1, 0x00); 192 priv->write_reg(priv, SJA1000_ACCC2, 0x00); 193 priv->write_reg(priv, SJA1000_ACCC3, 0x00); 194 195 priv->write_reg(priv, SJA1000_ACCM0, 0xFF); 196 priv->write_reg(priv, SJA1000_ACCM1, 0xFF); 197 priv->write_reg(priv, SJA1000_ACCM2, 0xFF); 198 priv->write_reg(priv, SJA1000_ACCM3, 0xFF); 199 200 priv->write_reg(priv, SJA1000_OCR, priv->ocr | OCR_MODE_NORMAL); 201 } 202 203 static void sja1000_start(struct net_device *dev) 204 { 205 struct sja1000_priv *priv = netdev_priv(dev); 206 207 /* leave reset mode */ 208 if (priv->can.state != CAN_STATE_STOPPED) 209 set_reset_mode(dev); 210 211 /* Initialize chip if uninitialized at this stage */ 212 if (!(priv->read_reg(priv, SJA1000_CDR) & CDR_PELICAN)) 213 chipset_init(dev); 214 215 /* Clear error counters and error code capture */ 216 priv->write_reg(priv, SJA1000_TXERR, 0x0); 217 priv->write_reg(priv, SJA1000_RXERR, 0x0); 218 priv->read_reg(priv, SJA1000_ECC); 219 220 /* clear interrupt flags */ 221 priv->read_reg(priv, SJA1000_IR); 222 223 /* leave reset mode */ 224 set_normal_mode(dev); 225 } 226 227 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode) 228 { 229 switch (mode) { 230 case CAN_MODE_START: 231 sja1000_start(dev); 232 if (netif_queue_stopped(dev)) 233 netif_wake_queue(dev); 234 break; 235 236 default: 237 return -EOPNOTSUPP; 238 } 239 240 return 0; 241 } 242 243 static int sja1000_set_bittiming(struct net_device *dev) 244 { 245 struct sja1000_priv *priv = netdev_priv(dev); 246 struct can_bittiming *bt = &priv->can.bittiming; 247 u8 btr0, btr1; 248 249 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); 250 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | 251 (((bt->phase_seg2 - 1) & 0x7) << 4); 252 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 253 btr1 |= 0x80; 254 255 netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); 256 257 priv->write_reg(priv, SJA1000_BTR0, btr0); 258 priv->write_reg(priv, SJA1000_BTR1, btr1); 259 260 return 0; 261 } 262 263 static int sja1000_get_berr_counter(const struct net_device *dev, 264 struct can_berr_counter *bec) 265 { 266 struct sja1000_priv *priv = netdev_priv(dev); 267 268 bec->txerr = priv->read_reg(priv, SJA1000_TXERR); 269 bec->rxerr = priv->read_reg(priv, SJA1000_RXERR); 270 271 return 0; 272 } 273 274 /* 275 * transmit a CAN message 276 * message layout in the sk_buff should be like this: 277 * xx xx xx xx ff ll 00 11 22 33 44 55 66 77 278 * [ can-id ] [flags] [len] [can data (up to 8 bytes] 279 */ 280 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb, 281 struct net_device *dev) 282 { 283 struct sja1000_priv *priv = netdev_priv(dev); 284 struct can_frame *cf = (struct can_frame *)skb->data; 285 uint8_t fi; 286 canid_t id; 287 uint8_t dreg; 288 u8 cmd_reg_val = 0x00; 289 int i; 290 291 if (can_dropped_invalid_skb(dev, skb)) 292 return NETDEV_TX_OK; 293 294 netif_stop_queue(dev); 295 296 fi = can_get_cc_dlc(cf, priv->can.ctrlmode); 297 id = cf->can_id; 298 299 if (id & CAN_RTR_FLAG) 300 fi |= SJA1000_FI_RTR; 301 302 if (id & CAN_EFF_FLAG) { 303 fi |= SJA1000_FI_FF; 304 dreg = SJA1000_EFF_BUF; 305 priv->write_reg(priv, SJA1000_FI, fi); 306 priv->write_reg(priv, SJA1000_ID1, (id & 0x1fe00000) >> 21); 307 priv->write_reg(priv, SJA1000_ID2, (id & 0x001fe000) >> 13); 308 priv->write_reg(priv, SJA1000_ID3, (id & 0x00001fe0) >> 5); 309 priv->write_reg(priv, SJA1000_ID4, (id & 0x0000001f) << 3); 310 } else { 311 dreg = SJA1000_SFF_BUF; 312 priv->write_reg(priv, SJA1000_FI, fi); 313 priv->write_reg(priv, SJA1000_ID1, (id & 0x000007f8) >> 3); 314 priv->write_reg(priv, SJA1000_ID2, (id & 0x00000007) << 5); 315 } 316 317 for (i = 0; i < cf->len; i++) 318 priv->write_reg(priv, dreg++, cf->data[i]); 319 320 can_put_echo_skb(skb, dev, 0, 0); 321 322 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT) 323 cmd_reg_val |= CMD_AT; 324 325 if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) 326 cmd_reg_val |= CMD_SRR; 327 else 328 cmd_reg_val |= CMD_TR; 329 330 sja1000_write_cmdreg(priv, cmd_reg_val); 331 332 return NETDEV_TX_OK; 333 } 334 335 static void sja1000_rx(struct net_device *dev) 336 { 337 struct sja1000_priv *priv = netdev_priv(dev); 338 struct net_device_stats *stats = &dev->stats; 339 struct can_frame *cf; 340 struct sk_buff *skb; 341 uint8_t fi; 342 uint8_t dreg; 343 canid_t id; 344 int i; 345 346 /* create zero'ed CAN frame buffer */ 347 skb = alloc_can_skb(dev, &cf); 348 if (skb == NULL) 349 return; 350 351 fi = priv->read_reg(priv, SJA1000_FI); 352 353 if (fi & SJA1000_FI_FF) { 354 /* extended frame format (EFF) */ 355 dreg = SJA1000_EFF_BUF; 356 id = (priv->read_reg(priv, SJA1000_ID1) << 21) 357 | (priv->read_reg(priv, SJA1000_ID2) << 13) 358 | (priv->read_reg(priv, SJA1000_ID3) << 5) 359 | (priv->read_reg(priv, SJA1000_ID4) >> 3); 360 id |= CAN_EFF_FLAG; 361 } else { 362 /* standard frame format (SFF) */ 363 dreg = SJA1000_SFF_BUF; 364 id = (priv->read_reg(priv, SJA1000_ID1) << 3) 365 | (priv->read_reg(priv, SJA1000_ID2) >> 5); 366 } 367 368 can_frame_set_cc_len(cf, fi & 0x0F, priv->can.ctrlmode); 369 if (fi & SJA1000_FI_RTR) { 370 id |= CAN_RTR_FLAG; 371 } else { 372 for (i = 0; i < cf->len; i++) 373 cf->data[i] = priv->read_reg(priv, dreg++); 374 375 stats->rx_bytes += cf->len; 376 } 377 stats->rx_packets++; 378 379 cf->can_id = id; 380 381 /* release receive buffer */ 382 sja1000_write_cmdreg(priv, CMD_RRB); 383 384 netif_rx(skb); 385 } 386 387 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) 388 { 389 struct sja1000_priv *priv = netdev_priv(dev); 390 struct net_device_stats *stats = &dev->stats; 391 struct can_frame *cf; 392 struct sk_buff *skb; 393 enum can_state state = priv->can.state; 394 enum can_state rx_state, tx_state; 395 unsigned int rxerr, txerr; 396 uint8_t ecc, alc; 397 398 skb = alloc_can_err_skb(dev, &cf); 399 if (skb == NULL) 400 return -ENOMEM; 401 402 txerr = priv->read_reg(priv, SJA1000_TXERR); 403 rxerr = priv->read_reg(priv, SJA1000_RXERR); 404 405 cf->data[6] = txerr; 406 cf->data[7] = rxerr; 407 408 if (isrc & IRQ_DOI) { 409 /* data overrun interrupt */ 410 netdev_dbg(dev, "data overrun interrupt\n"); 411 cf->can_id |= CAN_ERR_CRTL; 412 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; 413 stats->rx_over_errors++; 414 stats->rx_errors++; 415 sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */ 416 } 417 418 if (isrc & IRQ_EI) { 419 /* error warning interrupt */ 420 netdev_dbg(dev, "error warning interrupt\n"); 421 422 if (status & SR_BS) 423 state = CAN_STATE_BUS_OFF; 424 else if (status & SR_ES) 425 state = CAN_STATE_ERROR_WARNING; 426 else 427 state = CAN_STATE_ERROR_ACTIVE; 428 } 429 if (isrc & IRQ_BEI) { 430 /* bus error interrupt */ 431 priv->can.can_stats.bus_error++; 432 stats->rx_errors++; 433 434 ecc = priv->read_reg(priv, SJA1000_ECC); 435 436 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 437 438 /* set error type */ 439 switch (ecc & ECC_MASK) { 440 case ECC_BIT: 441 cf->data[2] |= CAN_ERR_PROT_BIT; 442 break; 443 case ECC_FORM: 444 cf->data[2] |= CAN_ERR_PROT_FORM; 445 break; 446 case ECC_STUFF: 447 cf->data[2] |= CAN_ERR_PROT_STUFF; 448 break; 449 default: 450 break; 451 } 452 453 /* set error location */ 454 cf->data[3] = ecc & ECC_SEG; 455 456 /* Error occurred during transmission? */ 457 if ((ecc & ECC_DIR) == 0) 458 cf->data[2] |= CAN_ERR_PROT_TX; 459 } 460 if (isrc & IRQ_EPI) { 461 /* error passive interrupt */ 462 netdev_dbg(dev, "error passive interrupt\n"); 463 464 if (state == CAN_STATE_ERROR_PASSIVE) 465 state = CAN_STATE_ERROR_WARNING; 466 else 467 state = CAN_STATE_ERROR_PASSIVE; 468 } 469 if (isrc & IRQ_ALI) { 470 /* arbitration lost interrupt */ 471 netdev_dbg(dev, "arbitration lost interrupt\n"); 472 alc = priv->read_reg(priv, SJA1000_ALC); 473 priv->can.can_stats.arbitration_lost++; 474 cf->can_id |= CAN_ERR_LOSTARB; 475 cf->data[0] = alc & 0x1f; 476 } 477 478 if (state != priv->can.state) { 479 tx_state = txerr >= rxerr ? state : 0; 480 rx_state = txerr <= rxerr ? state : 0; 481 482 can_change_state(dev, cf, tx_state, rx_state); 483 484 if(state == CAN_STATE_BUS_OFF) 485 can_bus_off(dev); 486 } 487 488 netif_rx(skb); 489 490 return 0; 491 } 492 493 irqreturn_t sja1000_interrupt(int irq, void *dev_id) 494 { 495 struct net_device *dev = (struct net_device *)dev_id; 496 struct sja1000_priv *priv = netdev_priv(dev); 497 struct net_device_stats *stats = &dev->stats; 498 uint8_t isrc, status; 499 int n = 0; 500 501 if (priv->pre_irq) 502 priv->pre_irq(priv); 503 504 /* Shared interrupts and IRQ off? */ 505 if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF) 506 goto out; 507 508 while ((isrc = priv->read_reg(priv, SJA1000_IR)) && 509 (n < SJA1000_MAX_IRQ)) { 510 511 status = priv->read_reg(priv, SJA1000_SR); 512 /* check for absent controller due to hw unplug */ 513 if (status == 0xFF && sja1000_is_absent(priv)) 514 goto out; 515 516 if (isrc & IRQ_WUI) 517 netdev_warn(dev, "wakeup interrupt\n"); 518 519 if (isrc & IRQ_TI) { 520 /* transmission buffer released */ 521 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT && 522 !(status & SR_TCS)) { 523 stats->tx_errors++; 524 can_free_echo_skb(dev, 0, NULL); 525 } else { 526 /* transmission complete */ 527 stats->tx_bytes += can_get_echo_skb(dev, 0, NULL); 528 stats->tx_packets++; 529 } 530 netif_wake_queue(dev); 531 } 532 if (isrc & IRQ_RI) { 533 /* receive interrupt */ 534 while (status & SR_RBS) { 535 sja1000_rx(dev); 536 status = priv->read_reg(priv, SJA1000_SR); 537 /* check for absent controller */ 538 if (status == 0xFF && sja1000_is_absent(priv)) 539 goto out; 540 } 541 } 542 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) { 543 /* error interrupt */ 544 if (sja1000_err(dev, isrc, status)) 545 break; 546 } 547 n++; 548 } 549 out: 550 if (priv->post_irq) 551 priv->post_irq(priv); 552 553 if (n >= SJA1000_MAX_IRQ) 554 netdev_dbg(dev, "%d messages handled in ISR", n); 555 556 return (n) ? IRQ_HANDLED : IRQ_NONE; 557 } 558 EXPORT_SYMBOL_GPL(sja1000_interrupt); 559 560 static int sja1000_open(struct net_device *dev) 561 { 562 struct sja1000_priv *priv = netdev_priv(dev); 563 int err; 564 565 /* set chip into reset mode */ 566 set_reset_mode(dev); 567 568 /* common open */ 569 err = open_candev(dev); 570 if (err) 571 return err; 572 573 /* register interrupt handler, if not done by the device driver */ 574 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) { 575 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags, 576 dev->name, (void *)dev); 577 if (err) { 578 close_candev(dev); 579 return -EAGAIN; 580 } 581 } 582 583 /* init and start chi */ 584 sja1000_start(dev); 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 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_LOOPBACK | 624 CAN_CTRLMODE_LISTENONLY | 625 CAN_CTRLMODE_3_SAMPLES | 626 CAN_CTRLMODE_ONE_SHOT | 627 CAN_CTRLMODE_BERR_REPORTING | 628 CAN_CTRLMODE_PRESUME_ACK | 629 CAN_CTRLMODE_CC_LEN8_DLC; 630 631 spin_lock_init(&priv->cmdreg_lock); 632 633 if (sizeof_priv) 634 priv->priv = (void *)priv + sizeof(struct sja1000_priv); 635 636 return dev; 637 } 638 EXPORT_SYMBOL_GPL(alloc_sja1000dev); 639 640 void free_sja1000dev(struct net_device *dev) 641 { 642 free_candev(dev); 643 } 644 EXPORT_SYMBOL_GPL(free_sja1000dev); 645 646 static const struct net_device_ops sja1000_netdev_ops = { 647 .ndo_open = sja1000_open, 648 .ndo_stop = sja1000_close, 649 .ndo_start_xmit = sja1000_start_xmit, 650 .ndo_change_mtu = can_change_mtu, 651 }; 652 653 int register_sja1000dev(struct net_device *dev) 654 { 655 int ret; 656 657 if (!sja1000_probe_chip(dev)) 658 return -ENODEV; 659 660 dev->flags |= IFF_ECHO; /* we support local echo */ 661 dev->netdev_ops = &sja1000_netdev_ops; 662 663 set_reset_mode(dev); 664 chipset_init(dev); 665 666 ret = register_candev(dev); 667 668 return ret; 669 } 670 EXPORT_SYMBOL_GPL(register_sja1000dev); 671 672 void unregister_sja1000dev(struct net_device *dev) 673 { 674 set_reset_mode(dev); 675 unregister_candev(dev); 676 } 677 EXPORT_SYMBOL_GPL(unregister_sja1000dev); 678 679 static __init int sja1000_init(void) 680 { 681 printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME); 682 683 return 0; 684 } 685 686 module_init(sja1000_init); 687 688 static __exit void sja1000_exit(void) 689 { 690 printk(KERN_INFO "%s: driver removed\n", DRV_NAME); 691 } 692 693 module_exit(sja1000_exit); 694