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 if (!(priv->flags & SJA1000_QUIRK_NO_CDR_REG)) 187 /* set clock divider and output control register */ 188 priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN); 189 190 /* set acceptance filter (accept all) */ 191 priv->write_reg(priv, SJA1000_ACCC0, 0x00); 192 priv->write_reg(priv, SJA1000_ACCC1, 0x00); 193 priv->write_reg(priv, SJA1000_ACCC2, 0x00); 194 priv->write_reg(priv, SJA1000_ACCC3, 0x00); 195 196 priv->write_reg(priv, SJA1000_ACCM0, 0xFF); 197 priv->write_reg(priv, SJA1000_ACCM1, 0xFF); 198 priv->write_reg(priv, SJA1000_ACCM2, 0xFF); 199 priv->write_reg(priv, SJA1000_ACCM3, 0xFF); 200 201 priv->write_reg(priv, SJA1000_OCR, priv->ocr | OCR_MODE_NORMAL); 202 } 203 204 static void sja1000_start(struct net_device *dev) 205 { 206 struct sja1000_priv *priv = netdev_priv(dev); 207 208 /* leave reset mode */ 209 if (priv->can.state != CAN_STATE_STOPPED) 210 set_reset_mode(dev); 211 212 /* Initialize chip if uninitialized at this stage */ 213 if (!(priv->flags & SJA1000_QUIRK_NO_CDR_REG || 214 priv->read_reg(priv, SJA1000_CDR) & CDR_PELICAN)) 215 chipset_init(dev); 216 217 /* Clear error counters and error code capture */ 218 priv->write_reg(priv, SJA1000_TXERR, 0x0); 219 priv->write_reg(priv, SJA1000_RXERR, 0x0); 220 priv->read_reg(priv, SJA1000_ECC); 221 222 /* clear interrupt flags */ 223 priv->read_reg(priv, SJA1000_IR); 224 225 /* leave reset mode */ 226 set_normal_mode(dev); 227 } 228 229 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode) 230 { 231 switch (mode) { 232 case CAN_MODE_START: 233 sja1000_start(dev); 234 if (netif_queue_stopped(dev)) 235 netif_wake_queue(dev); 236 break; 237 238 default: 239 return -EOPNOTSUPP; 240 } 241 242 return 0; 243 } 244 245 static int sja1000_set_bittiming(struct net_device *dev) 246 { 247 struct sja1000_priv *priv = netdev_priv(dev); 248 struct can_bittiming *bt = &priv->can.bittiming; 249 u8 btr0, btr1; 250 251 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); 252 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | 253 (((bt->phase_seg2 - 1) & 0x7) << 4); 254 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 255 btr1 |= 0x80; 256 257 netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); 258 259 priv->write_reg(priv, SJA1000_BTR0, btr0); 260 priv->write_reg(priv, SJA1000_BTR1, btr1); 261 262 return 0; 263 } 264 265 static int sja1000_get_berr_counter(const struct net_device *dev, 266 struct can_berr_counter *bec) 267 { 268 struct sja1000_priv *priv = netdev_priv(dev); 269 270 bec->txerr = priv->read_reg(priv, SJA1000_TXERR); 271 bec->rxerr = priv->read_reg(priv, SJA1000_RXERR); 272 273 return 0; 274 } 275 276 /* 277 * transmit a CAN message 278 * message layout in the sk_buff should be like this: 279 * xx xx xx xx ff ll 00 11 22 33 44 55 66 77 280 * [ can-id ] [flags] [len] [can data (up to 8 bytes] 281 */ 282 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb, 283 struct net_device *dev) 284 { 285 struct sja1000_priv *priv = netdev_priv(dev); 286 struct can_frame *cf = (struct can_frame *)skb->data; 287 uint8_t fi; 288 canid_t id; 289 uint8_t dreg; 290 u8 cmd_reg_val = 0x00; 291 int i; 292 293 if (can_dropped_invalid_skb(dev, skb)) 294 return NETDEV_TX_OK; 295 296 netif_stop_queue(dev); 297 298 fi = can_get_cc_dlc(cf, priv->can.ctrlmode); 299 id = cf->can_id; 300 301 if (id & CAN_RTR_FLAG) 302 fi |= SJA1000_FI_RTR; 303 304 if (id & CAN_EFF_FLAG) { 305 fi |= SJA1000_FI_FF; 306 dreg = SJA1000_EFF_BUF; 307 priv->write_reg(priv, SJA1000_FI, fi); 308 priv->write_reg(priv, SJA1000_ID1, (id & 0x1fe00000) >> 21); 309 priv->write_reg(priv, SJA1000_ID2, (id & 0x001fe000) >> 13); 310 priv->write_reg(priv, SJA1000_ID3, (id & 0x00001fe0) >> 5); 311 priv->write_reg(priv, SJA1000_ID4, (id & 0x0000001f) << 3); 312 } else { 313 dreg = SJA1000_SFF_BUF; 314 priv->write_reg(priv, SJA1000_FI, fi); 315 priv->write_reg(priv, SJA1000_ID1, (id & 0x000007f8) >> 3); 316 priv->write_reg(priv, SJA1000_ID2, (id & 0x00000007) << 5); 317 } 318 319 for (i = 0; i < cf->len; i++) 320 priv->write_reg(priv, dreg++, cf->data[i]); 321 322 can_put_echo_skb(skb, dev, 0, 0); 323 324 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT) 325 cmd_reg_val |= CMD_AT; 326 327 if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) 328 cmd_reg_val |= CMD_SRR; 329 else 330 cmd_reg_val |= CMD_TR; 331 332 sja1000_write_cmdreg(priv, cmd_reg_val); 333 334 return NETDEV_TX_OK; 335 } 336 337 static void sja1000_rx(struct net_device *dev) 338 { 339 struct sja1000_priv *priv = netdev_priv(dev); 340 struct net_device_stats *stats = &dev->stats; 341 struct can_frame *cf; 342 struct sk_buff *skb; 343 uint8_t fi; 344 uint8_t dreg; 345 canid_t id; 346 int i; 347 348 /* create zero'ed CAN frame buffer */ 349 skb = alloc_can_skb(dev, &cf); 350 if (skb == NULL) 351 return; 352 353 fi = priv->read_reg(priv, SJA1000_FI); 354 355 if (fi & SJA1000_FI_FF) { 356 /* extended frame format (EFF) */ 357 dreg = SJA1000_EFF_BUF; 358 id = (priv->read_reg(priv, SJA1000_ID1) << 21) 359 | (priv->read_reg(priv, SJA1000_ID2) << 13) 360 | (priv->read_reg(priv, SJA1000_ID3) << 5) 361 | (priv->read_reg(priv, SJA1000_ID4) >> 3); 362 id |= CAN_EFF_FLAG; 363 } else { 364 /* standard frame format (SFF) */ 365 dreg = SJA1000_SFF_BUF; 366 id = (priv->read_reg(priv, SJA1000_ID1) << 3) 367 | (priv->read_reg(priv, SJA1000_ID2) >> 5); 368 } 369 370 can_frame_set_cc_len(cf, fi & 0x0F, priv->can.ctrlmode); 371 if (fi & SJA1000_FI_RTR) { 372 id |= CAN_RTR_FLAG; 373 } else { 374 for (i = 0; i < cf->len; i++) 375 cf->data[i] = priv->read_reg(priv, dreg++); 376 377 stats->rx_bytes += cf->len; 378 } 379 stats->rx_packets++; 380 381 cf->can_id = id; 382 383 /* release receive buffer */ 384 sja1000_write_cmdreg(priv, CMD_RRB); 385 386 netif_rx(skb); 387 } 388 389 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) 390 { 391 struct sja1000_priv *priv = netdev_priv(dev); 392 struct net_device_stats *stats = &dev->stats; 393 struct can_frame *cf; 394 struct sk_buff *skb; 395 enum can_state state = priv->can.state; 396 enum can_state rx_state, tx_state; 397 unsigned int rxerr, txerr; 398 uint8_t ecc, alc; 399 400 skb = alloc_can_err_skb(dev, &cf); 401 if (skb == NULL) 402 return -ENOMEM; 403 404 txerr = priv->read_reg(priv, SJA1000_TXERR); 405 rxerr = priv->read_reg(priv, SJA1000_RXERR); 406 407 if (isrc & IRQ_DOI) { 408 /* data overrun interrupt */ 409 netdev_dbg(dev, "data overrun interrupt\n"); 410 cf->can_id |= CAN_ERR_CRTL; 411 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; 412 stats->rx_over_errors++; 413 stats->rx_errors++; 414 sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */ 415 } 416 417 if (isrc & IRQ_EI) { 418 /* error warning interrupt */ 419 netdev_dbg(dev, "error warning interrupt\n"); 420 421 if (status & SR_BS) 422 state = CAN_STATE_BUS_OFF; 423 else if (status & SR_ES) 424 state = CAN_STATE_ERROR_WARNING; 425 else 426 state = CAN_STATE_ERROR_ACTIVE; 427 } 428 if (state != CAN_STATE_BUS_OFF) { 429 cf->can_id |= CAN_ERR_CNT; 430 cf->data[6] = txerr; 431 cf->data[7] = rxerr; 432 } 433 if (isrc & IRQ_BEI) { 434 /* bus error interrupt */ 435 priv->can.can_stats.bus_error++; 436 stats->rx_errors++; 437 438 ecc = priv->read_reg(priv, SJA1000_ECC); 439 440 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 441 442 /* set error type */ 443 switch (ecc & ECC_MASK) { 444 case ECC_BIT: 445 cf->data[2] |= CAN_ERR_PROT_BIT; 446 break; 447 case ECC_FORM: 448 cf->data[2] |= CAN_ERR_PROT_FORM; 449 break; 450 case ECC_STUFF: 451 cf->data[2] |= CAN_ERR_PROT_STUFF; 452 break; 453 default: 454 break; 455 } 456 457 /* set error location */ 458 cf->data[3] = ecc & ECC_SEG; 459 460 /* Error occurred during transmission? */ 461 if ((ecc & ECC_DIR) == 0) 462 cf->data[2] |= CAN_ERR_PROT_TX; 463 } 464 if (isrc & IRQ_EPI) { 465 /* error passive interrupt */ 466 netdev_dbg(dev, "error passive interrupt\n"); 467 468 if (state == CAN_STATE_ERROR_PASSIVE) 469 state = CAN_STATE_ERROR_WARNING; 470 else 471 state = CAN_STATE_ERROR_PASSIVE; 472 } 473 if (isrc & IRQ_ALI) { 474 /* arbitration lost interrupt */ 475 netdev_dbg(dev, "arbitration lost interrupt\n"); 476 alc = priv->read_reg(priv, SJA1000_ALC); 477 priv->can.can_stats.arbitration_lost++; 478 cf->can_id |= CAN_ERR_LOSTARB; 479 cf->data[0] = alc & 0x1f; 480 } 481 482 if (state != priv->can.state) { 483 tx_state = txerr >= rxerr ? state : 0; 484 rx_state = txerr <= rxerr ? state : 0; 485 486 can_change_state(dev, cf, tx_state, rx_state); 487 488 if(state == CAN_STATE_BUS_OFF) 489 can_bus_off(dev); 490 } 491 492 netif_rx(skb); 493 494 return 0; 495 } 496 497 irqreturn_t sja1000_interrupt(int irq, void *dev_id) 498 { 499 struct net_device *dev = (struct net_device *)dev_id; 500 struct sja1000_priv *priv = netdev_priv(dev); 501 struct net_device_stats *stats = &dev->stats; 502 uint8_t isrc, status; 503 int n = 0; 504 505 if (priv->pre_irq) 506 priv->pre_irq(priv); 507 508 /* Shared interrupts and IRQ off? */ 509 if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF) 510 goto out; 511 512 while ((isrc = priv->read_reg(priv, SJA1000_IR)) && 513 (n < SJA1000_MAX_IRQ)) { 514 515 status = priv->read_reg(priv, SJA1000_SR); 516 /* check for absent controller due to hw unplug */ 517 if (status == 0xFF && sja1000_is_absent(priv)) 518 goto out; 519 520 if (isrc & IRQ_WUI) 521 netdev_warn(dev, "wakeup interrupt\n"); 522 523 if (isrc & IRQ_TI) { 524 /* transmission buffer released */ 525 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT && 526 !(status & SR_TCS)) { 527 stats->tx_errors++; 528 can_free_echo_skb(dev, 0, NULL); 529 } else { 530 /* transmission complete */ 531 stats->tx_bytes += can_get_echo_skb(dev, 0, NULL); 532 stats->tx_packets++; 533 } 534 netif_wake_queue(dev); 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 } 553 out: 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 } 562 EXPORT_SYMBOL_GPL(sja1000_interrupt); 563 564 static 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 netif_start_queue(dev); 591 592 return 0; 593 } 594 595 static int sja1000_close(struct net_device *dev) 596 { 597 struct sja1000_priv *priv = netdev_priv(dev); 598 599 netif_stop_queue(dev); 600 set_reset_mode(dev); 601 602 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) 603 free_irq(dev->irq, (void *)dev); 604 605 close_candev(dev); 606 607 return 0; 608 } 609 610 struct net_device *alloc_sja1000dev(int sizeof_priv) 611 { 612 struct net_device *dev; 613 struct sja1000_priv *priv; 614 615 dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv, 616 SJA1000_ECHO_SKB_MAX); 617 if (!dev) 618 return NULL; 619 620 priv = netdev_priv(dev); 621 622 priv->dev = dev; 623 priv->can.bittiming_const = &sja1000_bittiming_const; 624 priv->can.do_set_bittiming = sja1000_set_bittiming; 625 priv->can.do_set_mode = sja1000_set_mode; 626 priv->can.do_get_berr_counter = sja1000_get_berr_counter; 627 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | 628 CAN_CTRLMODE_LISTENONLY | 629 CAN_CTRLMODE_3_SAMPLES | 630 CAN_CTRLMODE_ONE_SHOT | 631 CAN_CTRLMODE_BERR_REPORTING | 632 CAN_CTRLMODE_PRESUME_ACK | 633 CAN_CTRLMODE_CC_LEN8_DLC; 634 635 spin_lock_init(&priv->cmdreg_lock); 636 637 if (sizeof_priv) 638 priv->priv = (void *)priv + sizeof(struct sja1000_priv); 639 640 return dev; 641 } 642 EXPORT_SYMBOL_GPL(alloc_sja1000dev); 643 644 void free_sja1000dev(struct net_device *dev) 645 { 646 free_candev(dev); 647 } 648 EXPORT_SYMBOL_GPL(free_sja1000dev); 649 650 static const struct net_device_ops sja1000_netdev_ops = { 651 .ndo_open = sja1000_open, 652 .ndo_stop = sja1000_close, 653 .ndo_start_xmit = sja1000_start_xmit, 654 .ndo_change_mtu = can_change_mtu, 655 }; 656 657 int register_sja1000dev(struct net_device *dev) 658 { 659 int ret; 660 661 if (!sja1000_probe_chip(dev)) 662 return -ENODEV; 663 664 dev->flags |= IFF_ECHO; /* we support local echo */ 665 dev->netdev_ops = &sja1000_netdev_ops; 666 667 set_reset_mode(dev); 668 chipset_init(dev); 669 670 ret = register_candev(dev); 671 672 return ret; 673 } 674 EXPORT_SYMBOL_GPL(register_sja1000dev); 675 676 void unregister_sja1000dev(struct net_device *dev) 677 { 678 set_reset_mode(dev); 679 unregister_candev(dev); 680 } 681 EXPORT_SYMBOL_GPL(unregister_sja1000dev); 682 683 static __init int sja1000_init(void) 684 { 685 printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME); 686 687 return 0; 688 } 689 690 module_init(sja1000_init); 691 692 static __exit void sja1000_exit(void) 693 { 694 printk(KERN_INFO "%s: driver removed\n", DRV_NAME); 695 } 696 697 module_exit(sja1000_exit); 698