sja1000.c revision 2fea6cd303c0d0cd9067da31d873b6a6d5bd75e7
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 printk(KERN_INFO "%s: probing @0x%lX failed\n", 110 DRV_NAME, dev->base_addr); 111 return 0; 112 } 113 return -1; 114} 115 116static void set_reset_mode(struct net_device *dev) 117{ 118 struct sja1000_priv *priv = netdev_priv(dev); 119 unsigned char status = priv->read_reg(priv, SJA1000_MOD); 120 int i; 121 122 /* disable interrupts */ 123 priv->write_reg(priv, SJA1000_IER, IRQ_OFF); 124 125 for (i = 0; i < 100; i++) { 126 /* check reset bit */ 127 if (status & MOD_RM) { 128 priv->can.state = CAN_STATE_STOPPED; 129 return; 130 } 131 132 /* reset chip */ 133 priv->write_reg(priv, SJA1000_MOD, MOD_RM); 134 udelay(10); 135 status = priv->read_reg(priv, SJA1000_MOD); 136 } 137 138 netdev_err(dev, "setting SJA1000 into reset mode failed!\n"); 139} 140 141static void set_normal_mode(struct net_device *dev) 142{ 143 struct sja1000_priv *priv = netdev_priv(dev); 144 unsigned char status = priv->read_reg(priv, SJA1000_MOD); 145 int i; 146 147 for (i = 0; i < 100; i++) { 148 /* check reset bit */ 149 if ((status & MOD_RM) == 0) { 150 priv->can.state = CAN_STATE_ERROR_ACTIVE; 151 /* enable interrupts */ 152 if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING) 153 priv->write_reg(priv, SJA1000_IER, IRQ_ALL); 154 else 155 priv->write_reg(priv, SJA1000_IER, 156 IRQ_ALL & ~IRQ_BEI); 157 return; 158 } 159 160 /* set chip to normal mode */ 161 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) 162 priv->write_reg(priv, SJA1000_MOD, MOD_LOM); 163 else 164 priv->write_reg(priv, SJA1000_MOD, 0x00); 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 174static void sja1000_start(struct net_device *dev) 175{ 176 struct sja1000_priv *priv = netdev_priv(dev); 177 178 /* leave reset mode */ 179 if (priv->can.state != CAN_STATE_STOPPED) 180 set_reset_mode(dev); 181 182 /* Clear error counters and error code capture */ 183 priv->write_reg(priv, SJA1000_TXERR, 0x0); 184 priv->write_reg(priv, SJA1000_RXERR, 0x0); 185 priv->read_reg(priv, SJA1000_ECC); 186 187 /* leave reset mode */ 188 set_normal_mode(dev); 189} 190 191static int sja1000_set_mode(struct net_device *dev, enum can_mode mode) 192{ 193 switch (mode) { 194 case CAN_MODE_START: 195 sja1000_start(dev); 196 if (netif_queue_stopped(dev)) 197 netif_wake_queue(dev); 198 break; 199 200 default: 201 return -EOPNOTSUPP; 202 } 203 204 return 0; 205} 206 207static int sja1000_set_bittiming(struct net_device *dev) 208{ 209 struct sja1000_priv *priv = netdev_priv(dev); 210 struct can_bittiming *bt = &priv->can.bittiming; 211 u8 btr0, btr1; 212 213 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); 214 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | 215 (((bt->phase_seg2 - 1) & 0x7) << 4); 216 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 217 btr1 |= 0x80; 218 219 netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); 220 221 priv->write_reg(priv, SJA1000_BTR0, btr0); 222 priv->write_reg(priv, SJA1000_BTR1, btr1); 223 224 return 0; 225} 226 227static int sja1000_get_berr_counter(const struct net_device *dev, 228 struct can_berr_counter *bec) 229{ 230 struct sja1000_priv *priv = netdev_priv(dev); 231 232 bec->txerr = priv->read_reg(priv, SJA1000_TXERR); 233 bec->rxerr = priv->read_reg(priv, SJA1000_RXERR); 234 235 return 0; 236} 237 238/* 239 * initialize SJA1000 chip: 240 * - reset chip 241 * - set output mode 242 * - set baudrate 243 * - enable interrupts 244 * - start operating mode 245 */ 246static void chipset_init(struct net_device *dev) 247{ 248 struct sja1000_priv *priv = netdev_priv(dev); 249 250 /* set clock divider and output control register */ 251 priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN); 252 253 /* set acceptance filter (accept all) */ 254 priv->write_reg(priv, SJA1000_ACCC0, 0x00); 255 priv->write_reg(priv, SJA1000_ACCC1, 0x00); 256 priv->write_reg(priv, SJA1000_ACCC2, 0x00); 257 priv->write_reg(priv, SJA1000_ACCC3, 0x00); 258 259 priv->write_reg(priv, SJA1000_ACCM0, 0xFF); 260 priv->write_reg(priv, SJA1000_ACCM1, 0xFF); 261 priv->write_reg(priv, SJA1000_ACCM2, 0xFF); 262 priv->write_reg(priv, SJA1000_ACCM3, 0xFF); 263 264 priv->write_reg(priv, SJA1000_OCR, priv->ocr | OCR_MODE_NORMAL); 265} 266 267/* 268 * transmit a CAN message 269 * message layout in the sk_buff should be like this: 270 * xx xx xx xx ff ll 00 11 22 33 44 55 66 77 271 * [ can-id ] [flags] [len] [can data (up to 8 bytes] 272 */ 273static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb, 274 struct net_device *dev) 275{ 276 struct sja1000_priv *priv = netdev_priv(dev); 277 struct can_frame *cf = (struct can_frame *)skb->data; 278 uint8_t fi; 279 uint8_t dlc; 280 canid_t id; 281 uint8_t dreg; 282 int i; 283 284 if (can_dropped_invalid_skb(dev, skb)) 285 return NETDEV_TX_OK; 286 287 netif_stop_queue(dev); 288 289 fi = dlc = cf->can_dlc; 290 id = cf->can_id; 291 292 if (id & CAN_RTR_FLAG) 293 fi |= SJA1000_FI_RTR; 294 295 if (id & CAN_EFF_FLAG) { 296 fi |= SJA1000_FI_FF; 297 dreg = SJA1000_EFF_BUF; 298 priv->write_reg(priv, SJA1000_FI, fi); 299 priv->write_reg(priv, SJA1000_ID1, (id & 0x1fe00000) >> 21); 300 priv->write_reg(priv, SJA1000_ID2, (id & 0x001fe000) >> 13); 301 priv->write_reg(priv, SJA1000_ID3, (id & 0x00001fe0) >> 5); 302 priv->write_reg(priv, SJA1000_ID4, (id & 0x0000001f) << 3); 303 } else { 304 dreg = SJA1000_SFF_BUF; 305 priv->write_reg(priv, SJA1000_FI, fi); 306 priv->write_reg(priv, SJA1000_ID1, (id & 0x000007f8) >> 3); 307 priv->write_reg(priv, SJA1000_ID2, (id & 0x00000007) << 5); 308 } 309 310 for (i = 0; i < dlc; i++) 311 priv->write_reg(priv, dreg++, cf->data[i]); 312 313 can_put_echo_skb(skb, dev, 0); 314 315 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT) 316 sja1000_write_cmdreg(priv, CMD_TR | CMD_AT); 317 else 318 sja1000_write_cmdreg(priv, CMD_TR); 319 320 return NETDEV_TX_OK; 321} 322 323static void sja1000_rx(struct net_device *dev) 324{ 325 struct sja1000_priv *priv = netdev_priv(dev); 326 struct net_device_stats *stats = &dev->stats; 327 struct can_frame *cf; 328 struct sk_buff *skb; 329 uint8_t fi; 330 uint8_t dreg; 331 canid_t id; 332 int i; 333 334 /* create zero'ed CAN frame buffer */ 335 skb = alloc_can_skb(dev, &cf); 336 if (skb == NULL) 337 return; 338 339 fi = priv->read_reg(priv, SJA1000_FI); 340 341 if (fi & SJA1000_FI_FF) { 342 /* extended frame format (EFF) */ 343 dreg = SJA1000_EFF_BUF; 344 id = (priv->read_reg(priv, SJA1000_ID1) << 21) 345 | (priv->read_reg(priv, SJA1000_ID2) << 13) 346 | (priv->read_reg(priv, SJA1000_ID3) << 5) 347 | (priv->read_reg(priv, SJA1000_ID4) >> 3); 348 id |= CAN_EFF_FLAG; 349 } else { 350 /* standard frame format (SFF) */ 351 dreg = SJA1000_SFF_BUF; 352 id = (priv->read_reg(priv, SJA1000_ID1) << 3) 353 | (priv->read_reg(priv, SJA1000_ID2) >> 5); 354 } 355 356 cf->can_dlc = get_can_dlc(fi & 0x0F); 357 if (fi & SJA1000_FI_RTR) { 358 id |= CAN_RTR_FLAG; 359 } else { 360 for (i = 0; i < cf->can_dlc; i++) 361 cf->data[i] = priv->read_reg(priv, dreg++); 362 } 363 364 cf->can_id = id; 365 366 /* release receive buffer */ 367 sja1000_write_cmdreg(priv, CMD_RRB); 368 369 netif_rx(skb); 370 371 stats->rx_packets++; 372 stats->rx_bytes += cf->can_dlc; 373 374 can_led_event(dev, CAN_LED_EVENT_RX); 375} 376 377static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) 378{ 379 struct sja1000_priv *priv = netdev_priv(dev); 380 struct net_device_stats *stats = &dev->stats; 381 struct can_frame *cf; 382 struct sk_buff *skb; 383 enum can_state state = priv->can.state; 384 uint8_t ecc, alc; 385 386 skb = alloc_can_err_skb(dev, &cf); 387 if (skb == NULL) 388 return -ENOMEM; 389 390 if (isrc & IRQ_DOI) { 391 /* data overrun interrupt */ 392 netdev_dbg(dev, "data overrun interrupt\n"); 393 cf->can_id |= CAN_ERR_CRTL; 394 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; 395 stats->rx_over_errors++; 396 stats->rx_errors++; 397 sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */ 398 } 399 400 if (isrc & IRQ_EI) { 401 /* error warning interrupt */ 402 netdev_dbg(dev, "error warning interrupt\n"); 403 404 if (status & SR_BS) { 405 state = CAN_STATE_BUS_OFF; 406 cf->can_id |= CAN_ERR_BUSOFF; 407 can_bus_off(dev); 408 } else if (status & SR_ES) { 409 state = CAN_STATE_ERROR_WARNING; 410 } else 411 state = CAN_STATE_ERROR_ACTIVE; 412 } 413 if (isrc & IRQ_BEI) { 414 /* bus error interrupt */ 415 priv->can.can_stats.bus_error++; 416 stats->rx_errors++; 417 418 ecc = priv->read_reg(priv, SJA1000_ECC); 419 420 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 421 422 switch (ecc & ECC_MASK) { 423 case ECC_BIT: 424 cf->data[2] |= CAN_ERR_PROT_BIT; 425 break; 426 case ECC_FORM: 427 cf->data[2] |= CAN_ERR_PROT_FORM; 428 break; 429 case ECC_STUFF: 430 cf->data[2] |= CAN_ERR_PROT_STUFF; 431 break; 432 default: 433 cf->data[2] |= CAN_ERR_PROT_UNSPEC; 434 cf->data[3] = ecc & ECC_SEG; 435 break; 436 } 437 /* Error occurred during transmission? */ 438 if ((ecc & ECC_DIR) == 0) 439 cf->data[2] |= CAN_ERR_PROT_TX; 440 } 441 if (isrc & IRQ_EPI) { 442 /* error passive interrupt */ 443 netdev_dbg(dev, "error passive interrupt\n"); 444 if (status & SR_ES) 445 state = CAN_STATE_ERROR_PASSIVE; 446 else 447 state = CAN_STATE_ERROR_ACTIVE; 448 } 449 if (isrc & IRQ_ALI) { 450 /* arbitration lost interrupt */ 451 netdev_dbg(dev, "arbitration lost interrupt\n"); 452 alc = priv->read_reg(priv, SJA1000_ALC); 453 priv->can.can_stats.arbitration_lost++; 454 stats->tx_errors++; 455 cf->can_id |= CAN_ERR_LOSTARB; 456 cf->data[0] = alc & 0x1f; 457 } 458 459 if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING || 460 state == CAN_STATE_ERROR_PASSIVE)) { 461 uint8_t rxerr = priv->read_reg(priv, SJA1000_RXERR); 462 uint8_t txerr = priv->read_reg(priv, SJA1000_TXERR); 463 cf->can_id |= CAN_ERR_CRTL; 464 if (state == CAN_STATE_ERROR_WARNING) { 465 priv->can.can_stats.error_warning++; 466 cf->data[1] = (txerr > rxerr) ? 467 CAN_ERR_CRTL_TX_WARNING : 468 CAN_ERR_CRTL_RX_WARNING; 469 } else { 470 priv->can.can_stats.error_passive++; 471 cf->data[1] = (txerr > rxerr) ? 472 CAN_ERR_CRTL_TX_PASSIVE : 473 CAN_ERR_CRTL_RX_PASSIVE; 474 } 475 cf->data[6] = txerr; 476 cf->data[7] = rxerr; 477 } 478 479 priv->can.state = state; 480 481 netif_rx(skb); 482 483 stats->rx_packets++; 484 stats->rx_bytes += cf->can_dlc; 485 486 return 0; 487} 488 489irqreturn_t sja1000_interrupt(int irq, void *dev_id) 490{ 491 struct net_device *dev = (struct net_device *)dev_id; 492 struct sja1000_priv *priv = netdev_priv(dev); 493 struct net_device_stats *stats = &dev->stats; 494 uint8_t isrc, status; 495 int n = 0; 496 497 if (priv->pre_irq) 498 priv->pre_irq(priv); 499 500 /* Shared interrupts and IRQ off? */ 501 if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF) 502 goto out; 503 504 while ((isrc = priv->read_reg(priv, SJA1000_IR)) && 505 (n < SJA1000_MAX_IRQ)) { 506 507 status = priv->read_reg(priv, SJA1000_SR); 508 /* check for absent controller due to hw unplug */ 509 if (status == 0xFF && sja1000_is_absent(priv)) 510 goto out; 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, SJA1000_FI) & 0xf; 525 stats->tx_packets++; 526 can_get_echo_skb(dev, 0); 527 } 528 netif_wake_queue(dev); 529 can_led_event(dev, CAN_LED_EVENT_TX); 530 } 531 if (isrc & IRQ_RI) { 532 /* receive interrupt */ 533 while (status & SR_RBS) { 534 sja1000_rx(dev); 535 status = priv->read_reg(priv, SJA1000_SR); 536 /* check for absent controller */ 537 if (status == 0xFF && sja1000_is_absent(priv)) 538 goto out; 539 } 540 } 541 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) { 542 /* error interrupt */ 543 if (sja1000_err(dev, isrc, status)) 544 break; 545 } 546 n++; 547 } 548out: 549 if (priv->post_irq) 550 priv->post_irq(priv); 551 552 if (n >= SJA1000_MAX_IRQ) 553 netdev_dbg(dev, "%d messages handled in ISR", n); 554 555 return (n) ? IRQ_HANDLED : IRQ_NONE; 556} 557EXPORT_SYMBOL_GPL(sja1000_interrupt); 558 559static int sja1000_open(struct net_device *dev) 560{ 561 struct sja1000_priv *priv = netdev_priv(dev); 562 int err; 563 564 /* set chip into reset mode */ 565 set_reset_mode(dev); 566 567 /* common open */ 568 err = open_candev(dev); 569 if (err) 570 return err; 571 572 /* register interrupt handler, if not done by the device driver */ 573 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) { 574 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags, 575 dev->name, (void *)dev); 576 if (err) { 577 close_candev(dev); 578 return -EAGAIN; 579 } 580 } 581 582 /* init and start chi */ 583 sja1000_start(dev); 584 585 can_led_event(dev, CAN_LED_EVENT_OPEN); 586 587 netif_start_queue(dev); 588 589 return 0; 590} 591 592static int sja1000_close(struct net_device *dev) 593{ 594 struct sja1000_priv *priv = netdev_priv(dev); 595 596 netif_stop_queue(dev); 597 set_reset_mode(dev); 598 599 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) 600 free_irq(dev->irq, (void *)dev); 601 602 close_candev(dev); 603 604 can_led_event(dev, CAN_LED_EVENT_STOP); 605 606 return 0; 607} 608 609struct net_device *alloc_sja1000dev(int sizeof_priv) 610{ 611 struct net_device *dev; 612 struct sja1000_priv *priv; 613 614 dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv, 615 SJA1000_ECHO_SKB_MAX); 616 if (!dev) 617 return NULL; 618 619 priv = netdev_priv(dev); 620 621 priv->dev = dev; 622 priv->can.bittiming_const = &sja1000_bittiming_const; 623 priv->can.do_set_bittiming = sja1000_set_bittiming; 624 priv->can.do_set_mode = sja1000_set_mode; 625 priv->can.do_get_berr_counter = sja1000_get_berr_counter; 626 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | 627 CAN_CTRLMODE_BERR_REPORTING | CAN_CTRLMODE_LISTENONLY | 628 CAN_CTRLMODE_ONE_SHOT; 629 630 spin_lock_init(&priv->cmdreg_lock); 631 632 if (sizeof_priv) 633 priv->priv = (void *)priv + sizeof(struct sja1000_priv); 634 635 return dev; 636} 637EXPORT_SYMBOL_GPL(alloc_sja1000dev); 638 639void free_sja1000dev(struct net_device *dev) 640{ 641 free_candev(dev); 642} 643EXPORT_SYMBOL_GPL(free_sja1000dev); 644 645static const struct net_device_ops sja1000_netdev_ops = { 646 .ndo_open = sja1000_open, 647 .ndo_stop = sja1000_close, 648 .ndo_start_xmit = sja1000_start_xmit, 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