sja1000.c revision dcf9e152670ea74dec24ec9ad57c495e631edba9
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 u8 cmd_reg_val = 0x00; 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 cmd_reg_val |= CMD_AT; 317 318 if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) 319 cmd_reg_val |= CMD_SRR; 320 else 321 cmd_reg_val |= CMD_TR; 322 323 sja1000_write_cmdreg(priv, cmd_reg_val); 324 325 return NETDEV_TX_OK; 326} 327 328static void sja1000_rx(struct net_device *dev) 329{ 330 struct sja1000_priv *priv = netdev_priv(dev); 331 struct net_device_stats *stats = &dev->stats; 332 struct can_frame *cf; 333 struct sk_buff *skb; 334 uint8_t fi; 335 uint8_t dreg; 336 canid_t id; 337 int i; 338 339 /* create zero'ed CAN frame buffer */ 340 skb = alloc_can_skb(dev, &cf); 341 if (skb == NULL) 342 return; 343 344 fi = priv->read_reg(priv, SJA1000_FI); 345 346 if (fi & SJA1000_FI_FF) { 347 /* extended frame format (EFF) */ 348 dreg = SJA1000_EFF_BUF; 349 id = (priv->read_reg(priv, SJA1000_ID1) << 21) 350 | (priv->read_reg(priv, SJA1000_ID2) << 13) 351 | (priv->read_reg(priv, SJA1000_ID3) << 5) 352 | (priv->read_reg(priv, SJA1000_ID4) >> 3); 353 id |= CAN_EFF_FLAG; 354 } else { 355 /* standard frame format (SFF) */ 356 dreg = SJA1000_SFF_BUF; 357 id = (priv->read_reg(priv, SJA1000_ID1) << 3) 358 | (priv->read_reg(priv, SJA1000_ID2) >> 5); 359 } 360 361 cf->can_dlc = get_can_dlc(fi & 0x0F); 362 if (fi & SJA1000_FI_RTR) { 363 id |= CAN_RTR_FLAG; 364 } else { 365 for (i = 0; i < cf->can_dlc; i++) 366 cf->data[i] = priv->read_reg(priv, dreg++); 367 } 368 369 cf->can_id = id; 370 371 /* release receive buffer */ 372 sja1000_write_cmdreg(priv, CMD_RRB); 373 374 netif_rx(skb); 375 376 stats->rx_packets++; 377 stats->rx_bytes += cf->can_dlc; 378 379 can_led_event(dev, CAN_LED_EVENT_RX); 380} 381 382static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) 383{ 384 struct sja1000_priv *priv = netdev_priv(dev); 385 struct net_device_stats *stats = &dev->stats; 386 struct can_frame *cf; 387 struct sk_buff *skb; 388 enum can_state state = priv->can.state; 389 uint8_t ecc, alc; 390 391 skb = alloc_can_err_skb(dev, &cf); 392 if (skb == NULL) 393 return -ENOMEM; 394 395 if (isrc & IRQ_DOI) { 396 /* data overrun interrupt */ 397 netdev_dbg(dev, "data overrun interrupt\n"); 398 cf->can_id |= CAN_ERR_CRTL; 399 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; 400 stats->rx_over_errors++; 401 stats->rx_errors++; 402 sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */ 403 } 404 405 if (isrc & IRQ_EI) { 406 /* error warning interrupt */ 407 netdev_dbg(dev, "error warning interrupt\n"); 408 409 if (status & SR_BS) { 410 state = CAN_STATE_BUS_OFF; 411 cf->can_id |= CAN_ERR_BUSOFF; 412 can_bus_off(dev); 413 } else if (status & SR_ES) { 414 state = CAN_STATE_ERROR_WARNING; 415 } else 416 state = CAN_STATE_ERROR_ACTIVE; 417 } 418 if (isrc & IRQ_BEI) { 419 /* bus error interrupt */ 420 priv->can.can_stats.bus_error++; 421 stats->rx_errors++; 422 423 ecc = priv->read_reg(priv, SJA1000_ECC); 424 425 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 426 427 switch (ecc & ECC_MASK) { 428 case ECC_BIT: 429 cf->data[2] |= CAN_ERR_PROT_BIT; 430 break; 431 case ECC_FORM: 432 cf->data[2] |= CAN_ERR_PROT_FORM; 433 break; 434 case ECC_STUFF: 435 cf->data[2] |= CAN_ERR_PROT_STUFF; 436 break; 437 default: 438 cf->data[2] |= CAN_ERR_PROT_UNSPEC; 439 cf->data[3] = ecc & ECC_SEG; 440 break; 441 } 442 /* Error occurred during transmission? */ 443 if ((ecc & ECC_DIR) == 0) 444 cf->data[2] |= CAN_ERR_PROT_TX; 445 } 446 if (isrc & IRQ_EPI) { 447 /* error passive interrupt */ 448 netdev_dbg(dev, "error passive interrupt\n"); 449 if (status & SR_ES) 450 state = CAN_STATE_ERROR_PASSIVE; 451 else 452 state = CAN_STATE_ERROR_ACTIVE; 453 } 454 if (isrc & IRQ_ALI) { 455 /* arbitration lost interrupt */ 456 netdev_dbg(dev, "arbitration lost interrupt\n"); 457 alc = priv->read_reg(priv, SJA1000_ALC); 458 priv->can.can_stats.arbitration_lost++; 459 stats->tx_errors++; 460 cf->can_id |= CAN_ERR_LOSTARB; 461 cf->data[0] = alc & 0x1f; 462 } 463 464 if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING || 465 state == CAN_STATE_ERROR_PASSIVE)) { 466 uint8_t rxerr = priv->read_reg(priv, SJA1000_RXERR); 467 uint8_t txerr = priv->read_reg(priv, SJA1000_TXERR); 468 cf->can_id |= CAN_ERR_CRTL; 469 if (state == CAN_STATE_ERROR_WARNING) { 470 priv->can.can_stats.error_warning++; 471 cf->data[1] = (txerr > rxerr) ? 472 CAN_ERR_CRTL_TX_WARNING : 473 CAN_ERR_CRTL_RX_WARNING; 474 } else { 475 priv->can.can_stats.error_passive++; 476 cf->data[1] = (txerr > rxerr) ? 477 CAN_ERR_CRTL_TX_PASSIVE : 478 CAN_ERR_CRTL_RX_PASSIVE; 479 } 480 cf->data[6] = txerr; 481 cf->data[7] = rxerr; 482 } 483 484 priv->can.state = state; 485 486 netif_rx(skb); 487 488 stats->rx_packets++; 489 stats->rx_bytes += cf->can_dlc; 490 491 return 0; 492} 493 494irqreturn_t sja1000_interrupt(int irq, void *dev_id) 495{ 496 struct net_device *dev = (struct net_device *)dev_id; 497 struct sja1000_priv *priv = netdev_priv(dev); 498 struct net_device_stats *stats = &dev->stats; 499 uint8_t isrc, status; 500 int n = 0; 501 502 if (priv->pre_irq) 503 priv->pre_irq(priv); 504 505 /* Shared interrupts and IRQ off? */ 506 if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF) 507 goto out; 508 509 while ((isrc = priv->read_reg(priv, SJA1000_IR)) && 510 (n < SJA1000_MAX_IRQ)) { 511 512 status = priv->read_reg(priv, SJA1000_SR); 513 /* check for absent controller due to hw unplug */ 514 if (status == 0xFF && sja1000_is_absent(priv)) 515 goto out; 516 517 if (isrc & IRQ_WUI) 518 netdev_warn(dev, "wakeup interrupt\n"); 519 520 if (isrc & IRQ_TI) { 521 /* transmission buffer released */ 522 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT && 523 !(status & SR_TCS)) { 524 stats->tx_errors++; 525 can_free_echo_skb(dev, 0); 526 } else { 527 /* transmission complete */ 528 stats->tx_bytes += 529 priv->read_reg(priv, SJA1000_FI) & 0xf; 530 stats->tx_packets++; 531 can_get_echo_skb(dev, 0); 532 } 533 netif_wake_queue(dev); 534 can_led_event(dev, CAN_LED_EVENT_TX); 535 } 536 if (isrc & IRQ_RI) { 537 /* receive interrupt */ 538 while (status & SR_RBS) { 539 sja1000_rx(dev); 540 status = priv->read_reg(priv, SJA1000_SR); 541 /* check for absent controller */ 542 if (status == 0xFF && sja1000_is_absent(priv)) 543 goto out; 544 } 545 } 546 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) { 547 /* error interrupt */ 548 if (sja1000_err(dev, isrc, status)) 549 break; 550 } 551 n++; 552 } 553out: 554 if (priv->post_irq) 555 priv->post_irq(priv); 556 557 if (n >= SJA1000_MAX_IRQ) 558 netdev_dbg(dev, "%d messages handled in ISR", n); 559 560 return (n) ? IRQ_HANDLED : IRQ_NONE; 561} 562EXPORT_SYMBOL_GPL(sja1000_interrupt); 563 564static int sja1000_open(struct net_device *dev) 565{ 566 struct sja1000_priv *priv = netdev_priv(dev); 567 int err; 568 569 /* set chip into reset mode */ 570 set_reset_mode(dev); 571 572 /* common open */ 573 err = open_candev(dev); 574 if (err) 575 return err; 576 577 /* register interrupt handler, if not done by the device driver */ 578 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) { 579 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags, 580 dev->name, (void *)dev); 581 if (err) { 582 close_candev(dev); 583 return -EAGAIN; 584 } 585 } 586 587 /* init and start chi */ 588 sja1000_start(dev); 589 590 can_led_event(dev, CAN_LED_EVENT_OPEN); 591 592 netif_start_queue(dev); 593 594 return 0; 595} 596 597static int sja1000_close(struct net_device *dev) 598{ 599 struct sja1000_priv *priv = netdev_priv(dev); 600 601 netif_stop_queue(dev); 602 set_reset_mode(dev); 603 604 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) 605 free_irq(dev->irq, (void *)dev); 606 607 close_candev(dev); 608 609 can_led_event(dev, CAN_LED_EVENT_STOP); 610 611 return 0; 612} 613 614struct net_device *alloc_sja1000dev(int sizeof_priv) 615{ 616 struct net_device *dev; 617 struct sja1000_priv *priv; 618 619 dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv, 620 SJA1000_ECHO_SKB_MAX); 621 if (!dev) 622 return NULL; 623 624 priv = netdev_priv(dev); 625 626 priv->dev = dev; 627 priv->can.bittiming_const = &sja1000_bittiming_const; 628 priv->can.do_set_bittiming = sja1000_set_bittiming; 629 priv->can.do_set_mode = sja1000_set_mode; 630 priv->can.do_get_berr_counter = sja1000_get_berr_counter; 631 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | 632 CAN_CTRLMODE_LISTENONLY | 633 CAN_CTRLMODE_3_SAMPLES | 634 CAN_CTRLMODE_ONE_SHOT | 635 CAN_CTRLMODE_BERR_REPORTING; 636 637 spin_lock_init(&priv->cmdreg_lock); 638 639 if (sizeof_priv) 640 priv->priv = (void *)priv + sizeof(struct sja1000_priv); 641 642 return dev; 643} 644EXPORT_SYMBOL_GPL(alloc_sja1000dev); 645 646void free_sja1000dev(struct net_device *dev) 647{ 648 free_candev(dev); 649} 650EXPORT_SYMBOL_GPL(free_sja1000dev); 651 652static const struct net_device_ops sja1000_netdev_ops = { 653 .ndo_open = sja1000_open, 654 .ndo_stop = sja1000_close, 655 .ndo_start_xmit = sja1000_start_xmit, 656 .ndo_change_mtu = can_change_mtu, 657}; 658 659int register_sja1000dev(struct net_device *dev) 660{ 661 int ret; 662 663 if (!sja1000_probe_chip(dev)) 664 return -ENODEV; 665 666 dev->flags |= IFF_ECHO; /* we support local echo */ 667 dev->netdev_ops = &sja1000_netdev_ops; 668 669 set_reset_mode(dev); 670 chipset_init(dev); 671 672 ret = register_candev(dev); 673 674 if (!ret) 675 devm_can_led_init(dev); 676 677 return ret; 678} 679EXPORT_SYMBOL_GPL(register_sja1000dev); 680 681void unregister_sja1000dev(struct net_device *dev) 682{ 683 set_reset_mode(dev); 684 unregister_candev(dev); 685} 686EXPORT_SYMBOL_GPL(unregister_sja1000dev); 687 688static __init int sja1000_init(void) 689{ 690 printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME); 691 692 return 0; 693} 694 695module_init(sja1000_init); 696 697static __exit void sja1000_exit(void) 698{ 699 printk(KERN_INFO "%s: driver removed\n", DRV_NAME); 700} 701 702module_exit(sja1000_exit); 703