sja1000.c revision c971fa2ae42e73e9ccc2f5e93f268c8742da4c5d
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 69MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>"); 70MODULE_LICENSE("Dual BSD/GPL"); 71MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver"); 72 73static 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 85static 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 99static int sja1000_is_absent(struct sja1000_priv *priv) 100{ 101 return (priv->read_reg(priv, SJA1000_MOD) == 0xFF); 102} 103 104static 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 115static 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 140static 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 173static 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 190static 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 206static 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 226static 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 */ 245static 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 */ 272static 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 322static 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 376static 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 488irqreturn_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 } 547out: 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} 556EXPORT_SYMBOL_GPL(sja1000_interrupt); 557 558static 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 591static 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 608struct 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} 636EXPORT_SYMBOL_GPL(alloc_sja1000dev); 637 638void free_sja1000dev(struct net_device *dev) 639{ 640 free_candev(dev); 641} 642EXPORT_SYMBOL_GPL(free_sja1000dev); 643 644static 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 651int 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} 671EXPORT_SYMBOL_GPL(register_sja1000dev); 672 673void unregister_sja1000dev(struct net_device *dev) 674{ 675 set_reset_mode(dev); 676 unregister_candev(dev); 677} 678EXPORT_SYMBOL_GPL(unregister_sja1000dev); 679 680static __init int sja1000_init(void) 681{ 682 printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME); 683 684 return 0; 685} 686 687module_init(sja1000_init); 688 689static __exit void sja1000_exit(void) 690{ 691 printk(KERN_INFO "%s: driver removed\n", DRV_NAME); 692} 693 694module_exit(sja1000_exit); 695