sja1000.c revision 5b853ec3494e34eb4882f65ebbcd04b495ff3c85
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 u8 mod_reg_val = 0x00; 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 mod_reg_val |= MOD_LOM; 163 if (priv->can.ctrlmode & CAN_CTRLMODE_PRESUME_ACK) 164 mod_reg_val |= MOD_STM; 165 priv->write_reg(priv, SJA1000_MOD, mod_reg_val); 166 167 udelay(10); 168 169 status = priv->read_reg(priv, SJA1000_MOD); 170 } 171 172 netdev_err(dev, "setting SJA1000 into normal mode failed!\n"); 173} 174 175static void sja1000_start(struct net_device *dev) 176{ 177 struct sja1000_priv *priv = netdev_priv(dev); 178 179 /* leave reset mode */ 180 if (priv->can.state != CAN_STATE_STOPPED) 181 set_reset_mode(dev); 182 183 /* Clear error counters and error code capture */ 184 priv->write_reg(priv, SJA1000_TXERR, 0x0); 185 priv->write_reg(priv, SJA1000_RXERR, 0x0); 186 priv->read_reg(priv, SJA1000_ECC); 187 188 /* leave reset mode */ 189 set_normal_mode(dev); 190} 191 192static int sja1000_set_mode(struct net_device *dev, enum can_mode mode) 193{ 194 switch (mode) { 195 case CAN_MODE_START: 196 sja1000_start(dev); 197 if (netif_queue_stopped(dev)) 198 netif_wake_queue(dev); 199 break; 200 201 default: 202 return -EOPNOTSUPP; 203 } 204 205 return 0; 206} 207 208static int sja1000_set_bittiming(struct net_device *dev) 209{ 210 struct sja1000_priv *priv = netdev_priv(dev); 211 struct can_bittiming *bt = &priv->can.bittiming; 212 u8 btr0, btr1; 213 214 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); 215 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | 216 (((bt->phase_seg2 - 1) & 0x7) << 4); 217 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 218 btr1 |= 0x80; 219 220 netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); 221 222 priv->write_reg(priv, SJA1000_BTR0, btr0); 223 priv->write_reg(priv, SJA1000_BTR1, btr1); 224 225 return 0; 226} 227 228static int sja1000_get_berr_counter(const struct net_device *dev, 229 struct can_berr_counter *bec) 230{ 231 struct sja1000_priv *priv = netdev_priv(dev); 232 233 bec->txerr = priv->read_reg(priv, SJA1000_TXERR); 234 bec->rxerr = priv->read_reg(priv, SJA1000_RXERR); 235 236 return 0; 237} 238 239/* 240 * initialize SJA1000 chip: 241 * - reset chip 242 * - set output mode 243 * - set baudrate 244 * - enable interrupts 245 * - start operating mode 246 */ 247static void chipset_init(struct net_device *dev) 248{ 249 struct sja1000_priv *priv = netdev_priv(dev); 250 251 /* set clock divider and output control register */ 252 priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN); 253 254 /* set acceptance filter (accept all) */ 255 priv->write_reg(priv, SJA1000_ACCC0, 0x00); 256 priv->write_reg(priv, SJA1000_ACCC1, 0x00); 257 priv->write_reg(priv, SJA1000_ACCC2, 0x00); 258 priv->write_reg(priv, SJA1000_ACCC3, 0x00); 259 260 priv->write_reg(priv, SJA1000_ACCM0, 0xFF); 261 priv->write_reg(priv, SJA1000_ACCM1, 0xFF); 262 priv->write_reg(priv, SJA1000_ACCM2, 0xFF); 263 priv->write_reg(priv, SJA1000_ACCM3, 0xFF); 264 265 priv->write_reg(priv, SJA1000_OCR, priv->ocr | OCR_MODE_NORMAL); 266} 267 268/* 269 * transmit a CAN message 270 * message layout in the sk_buff should be like this: 271 * xx xx xx xx ff ll 00 11 22 33 44 55 66 77 272 * [ can-id ] [flags] [len] [can data (up to 8 bytes] 273 */ 274static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb, 275 struct net_device *dev) 276{ 277 struct sja1000_priv *priv = netdev_priv(dev); 278 struct can_frame *cf = (struct can_frame *)skb->data; 279 uint8_t fi; 280 uint8_t dlc; 281 canid_t id; 282 uint8_t dreg; 283 u8 cmd_reg_val = 0x00; 284 int i; 285 286 if (can_dropped_invalid_skb(dev, skb)) 287 return NETDEV_TX_OK; 288 289 netif_stop_queue(dev); 290 291 fi = dlc = cf->can_dlc; 292 id = cf->can_id; 293 294 if (id & CAN_RTR_FLAG) 295 fi |= SJA1000_FI_RTR; 296 297 if (id & CAN_EFF_FLAG) { 298 fi |= SJA1000_FI_FF; 299 dreg = SJA1000_EFF_BUF; 300 priv->write_reg(priv, SJA1000_FI, fi); 301 priv->write_reg(priv, SJA1000_ID1, (id & 0x1fe00000) >> 21); 302 priv->write_reg(priv, SJA1000_ID2, (id & 0x001fe000) >> 13); 303 priv->write_reg(priv, SJA1000_ID3, (id & 0x00001fe0) >> 5); 304 priv->write_reg(priv, SJA1000_ID4, (id & 0x0000001f) << 3); 305 } else { 306 dreg = SJA1000_SFF_BUF; 307 priv->write_reg(priv, SJA1000_FI, fi); 308 priv->write_reg(priv, SJA1000_ID1, (id & 0x000007f8) >> 3); 309 priv->write_reg(priv, SJA1000_ID2, (id & 0x00000007) << 5); 310 } 311 312 for (i = 0; i < dlc; i++) 313 priv->write_reg(priv, dreg++, cf->data[i]); 314 315 can_put_echo_skb(skb, dev, 0); 316 317 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT) 318 cmd_reg_val |= CMD_AT; 319 320 if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) 321 cmd_reg_val |= CMD_SRR; 322 else 323 cmd_reg_val |= CMD_TR; 324 325 sja1000_write_cmdreg(priv, cmd_reg_val); 326 327 return NETDEV_TX_OK; 328} 329 330static void sja1000_rx(struct net_device *dev) 331{ 332 struct sja1000_priv *priv = netdev_priv(dev); 333 struct net_device_stats *stats = &dev->stats; 334 struct can_frame *cf; 335 struct sk_buff *skb; 336 uint8_t fi; 337 uint8_t dreg; 338 canid_t id; 339 int i; 340 341 /* create zero'ed CAN frame buffer */ 342 skb = alloc_can_skb(dev, &cf); 343 if (skb == NULL) 344 return; 345 346 fi = priv->read_reg(priv, SJA1000_FI); 347 348 if (fi & SJA1000_FI_FF) { 349 /* extended frame format (EFF) */ 350 dreg = SJA1000_EFF_BUF; 351 id = (priv->read_reg(priv, SJA1000_ID1) << 21) 352 | (priv->read_reg(priv, SJA1000_ID2) << 13) 353 | (priv->read_reg(priv, SJA1000_ID3) << 5) 354 | (priv->read_reg(priv, SJA1000_ID4) >> 3); 355 id |= CAN_EFF_FLAG; 356 } else { 357 /* standard frame format (SFF) */ 358 dreg = SJA1000_SFF_BUF; 359 id = (priv->read_reg(priv, SJA1000_ID1) << 3) 360 | (priv->read_reg(priv, SJA1000_ID2) >> 5); 361 } 362 363 cf->can_dlc = get_can_dlc(fi & 0x0F); 364 if (fi & SJA1000_FI_RTR) { 365 id |= CAN_RTR_FLAG; 366 } else { 367 for (i = 0; i < cf->can_dlc; i++) 368 cf->data[i] = priv->read_reg(priv, dreg++); 369 } 370 371 cf->can_id = id; 372 373 /* release receive buffer */ 374 sja1000_write_cmdreg(priv, CMD_RRB); 375 376 netif_rx(skb); 377 378 stats->rx_packets++; 379 stats->rx_bytes += cf->can_dlc; 380 381 can_led_event(dev, CAN_LED_EVENT_RX); 382} 383 384static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) 385{ 386 struct sja1000_priv *priv = netdev_priv(dev); 387 struct net_device_stats *stats = &dev->stats; 388 struct can_frame *cf; 389 struct sk_buff *skb; 390 enum can_state state = priv->can.state; 391 uint8_t ecc, alc; 392 393 skb = alloc_can_err_skb(dev, &cf); 394 if (skb == NULL) 395 return -ENOMEM; 396 397 if (isrc & IRQ_DOI) { 398 /* data overrun interrupt */ 399 netdev_dbg(dev, "data overrun interrupt\n"); 400 cf->can_id |= CAN_ERR_CRTL; 401 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; 402 stats->rx_over_errors++; 403 stats->rx_errors++; 404 sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */ 405 } 406 407 if (isrc & IRQ_EI) { 408 /* error warning interrupt */ 409 netdev_dbg(dev, "error warning interrupt\n"); 410 411 if (status & SR_BS) { 412 state = CAN_STATE_BUS_OFF; 413 cf->can_id |= CAN_ERR_BUSOFF; 414 can_bus_off(dev); 415 } else if (status & SR_ES) { 416 state = CAN_STATE_ERROR_WARNING; 417 } else 418 state = CAN_STATE_ERROR_ACTIVE; 419 } 420 if (isrc & IRQ_BEI) { 421 /* bus error interrupt */ 422 priv->can.can_stats.bus_error++; 423 stats->rx_errors++; 424 425 ecc = priv->read_reg(priv, SJA1000_ECC); 426 427 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 428 429 switch (ecc & ECC_MASK) { 430 case ECC_BIT: 431 cf->data[2] |= CAN_ERR_PROT_BIT; 432 break; 433 case ECC_FORM: 434 cf->data[2] |= CAN_ERR_PROT_FORM; 435 break; 436 case ECC_STUFF: 437 cf->data[2] |= CAN_ERR_PROT_STUFF; 438 break; 439 default: 440 cf->data[2] |= CAN_ERR_PROT_UNSPEC; 441 cf->data[3] = ecc & ECC_SEG; 442 break; 443 } 444 /* Error occurred during transmission? */ 445 if ((ecc & ECC_DIR) == 0) 446 cf->data[2] |= CAN_ERR_PROT_TX; 447 } 448 if (isrc & IRQ_EPI) { 449 /* error passive interrupt */ 450 netdev_dbg(dev, "error passive interrupt\n"); 451 if (status & SR_ES) 452 state = CAN_STATE_ERROR_PASSIVE; 453 else 454 state = CAN_STATE_ERROR_ACTIVE; 455 } 456 if (isrc & IRQ_ALI) { 457 /* arbitration lost interrupt */ 458 netdev_dbg(dev, "arbitration lost interrupt\n"); 459 alc = priv->read_reg(priv, SJA1000_ALC); 460 priv->can.can_stats.arbitration_lost++; 461 stats->tx_errors++; 462 cf->can_id |= CAN_ERR_LOSTARB; 463 cf->data[0] = alc & 0x1f; 464 } 465 466 if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING || 467 state == CAN_STATE_ERROR_PASSIVE)) { 468 uint8_t rxerr = priv->read_reg(priv, SJA1000_RXERR); 469 uint8_t txerr = priv->read_reg(priv, SJA1000_TXERR); 470 cf->can_id |= CAN_ERR_CRTL; 471 if (state == CAN_STATE_ERROR_WARNING) { 472 priv->can.can_stats.error_warning++; 473 cf->data[1] = (txerr > rxerr) ? 474 CAN_ERR_CRTL_TX_WARNING : 475 CAN_ERR_CRTL_RX_WARNING; 476 } else { 477 priv->can.can_stats.error_passive++; 478 cf->data[1] = (txerr > rxerr) ? 479 CAN_ERR_CRTL_TX_PASSIVE : 480 CAN_ERR_CRTL_RX_PASSIVE; 481 } 482 cf->data[6] = txerr; 483 cf->data[7] = rxerr; 484 } 485 486 priv->can.state = state; 487 488 netif_rx(skb); 489 490 stats->rx_packets++; 491 stats->rx_bytes += cf->can_dlc; 492 493 return 0; 494} 495 496irqreturn_t sja1000_interrupt(int irq, void *dev_id) 497{ 498 struct net_device *dev = (struct net_device *)dev_id; 499 struct sja1000_priv *priv = netdev_priv(dev); 500 struct net_device_stats *stats = &dev->stats; 501 uint8_t isrc, status; 502 int n = 0; 503 504 if (priv->pre_irq) 505 priv->pre_irq(priv); 506 507 /* Shared interrupts and IRQ off? */ 508 if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF) 509 goto out; 510 511 while ((isrc = priv->read_reg(priv, SJA1000_IR)) && 512 (n < SJA1000_MAX_IRQ)) { 513 514 status = priv->read_reg(priv, SJA1000_SR); 515 /* check for absent controller due to hw unplug */ 516 if (status == 0xFF && sja1000_is_absent(priv)) 517 goto out; 518 519 if (isrc & IRQ_WUI) 520 netdev_warn(dev, "wakeup interrupt\n"); 521 522 if (isrc & IRQ_TI) { 523 /* transmission buffer released */ 524 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT && 525 !(status & SR_TCS)) { 526 stats->tx_errors++; 527 can_free_echo_skb(dev, 0); 528 } else { 529 /* transmission complete */ 530 stats->tx_bytes += 531 priv->read_reg(priv, SJA1000_FI) & 0xf; 532 stats->tx_packets++; 533 can_get_echo_skb(dev, 0); 534 } 535 netif_wake_queue(dev); 536 can_led_event(dev, CAN_LED_EVENT_TX); 537 } 538 if (isrc & IRQ_RI) { 539 /* receive interrupt */ 540 while (status & SR_RBS) { 541 sja1000_rx(dev); 542 status = priv->read_reg(priv, SJA1000_SR); 543 /* check for absent controller */ 544 if (status == 0xFF && sja1000_is_absent(priv)) 545 goto out; 546 } 547 } 548 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) { 549 /* error interrupt */ 550 if (sja1000_err(dev, isrc, status)) 551 break; 552 } 553 n++; 554 } 555out: 556 if (priv->post_irq) 557 priv->post_irq(priv); 558 559 if (n >= SJA1000_MAX_IRQ) 560 netdev_dbg(dev, "%d messages handled in ISR", n); 561 562 return (n) ? IRQ_HANDLED : IRQ_NONE; 563} 564EXPORT_SYMBOL_GPL(sja1000_interrupt); 565 566static int sja1000_open(struct net_device *dev) 567{ 568 struct sja1000_priv *priv = netdev_priv(dev); 569 int err; 570 571 /* set chip into reset mode */ 572 set_reset_mode(dev); 573 574 /* common open */ 575 err = open_candev(dev); 576 if (err) 577 return err; 578 579 /* register interrupt handler, if not done by the device driver */ 580 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) { 581 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags, 582 dev->name, (void *)dev); 583 if (err) { 584 close_candev(dev); 585 return -EAGAIN; 586 } 587 } 588 589 /* init and start chi */ 590 sja1000_start(dev); 591 592 can_led_event(dev, CAN_LED_EVENT_OPEN); 593 594 netif_start_queue(dev); 595 596 return 0; 597} 598 599static int sja1000_close(struct net_device *dev) 600{ 601 struct sja1000_priv *priv = netdev_priv(dev); 602 603 netif_stop_queue(dev); 604 set_reset_mode(dev); 605 606 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) 607 free_irq(dev->irq, (void *)dev); 608 609 close_candev(dev); 610 611 can_led_event(dev, CAN_LED_EVENT_STOP); 612 613 return 0; 614} 615 616struct net_device *alloc_sja1000dev(int sizeof_priv) 617{ 618 struct net_device *dev; 619 struct sja1000_priv *priv; 620 621 dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv, 622 SJA1000_ECHO_SKB_MAX); 623 if (!dev) 624 return NULL; 625 626 priv = netdev_priv(dev); 627 628 priv->dev = dev; 629 priv->can.bittiming_const = &sja1000_bittiming_const; 630 priv->can.do_set_bittiming = sja1000_set_bittiming; 631 priv->can.do_set_mode = sja1000_set_mode; 632 priv->can.do_get_berr_counter = sja1000_get_berr_counter; 633 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | 634 CAN_CTRLMODE_LISTENONLY | 635 CAN_CTRLMODE_3_SAMPLES | 636 CAN_CTRLMODE_ONE_SHOT | 637 CAN_CTRLMODE_BERR_REPORTING | 638 CAN_CTRLMODE_PRESUME_ACK; 639 640 spin_lock_init(&priv->cmdreg_lock); 641 642 if (sizeof_priv) 643 priv->priv = (void *)priv + sizeof(struct sja1000_priv); 644 645 return dev; 646} 647EXPORT_SYMBOL_GPL(alloc_sja1000dev); 648 649void free_sja1000dev(struct net_device *dev) 650{ 651 free_candev(dev); 652} 653EXPORT_SYMBOL_GPL(free_sja1000dev); 654 655static const struct net_device_ops sja1000_netdev_ops = { 656 .ndo_open = sja1000_open, 657 .ndo_stop = sja1000_close, 658 .ndo_start_xmit = sja1000_start_xmit, 659 .ndo_change_mtu = can_change_mtu, 660}; 661 662int register_sja1000dev(struct net_device *dev) 663{ 664 int ret; 665 666 if (!sja1000_probe_chip(dev)) 667 return -ENODEV; 668 669 dev->flags |= IFF_ECHO; /* we support local echo */ 670 dev->netdev_ops = &sja1000_netdev_ops; 671 672 set_reset_mode(dev); 673 chipset_init(dev); 674 675 ret = register_candev(dev); 676 677 if (!ret) 678 devm_can_led_init(dev); 679 680 return ret; 681} 682EXPORT_SYMBOL_GPL(register_sja1000dev); 683 684void unregister_sja1000dev(struct net_device *dev) 685{ 686 set_reset_mode(dev); 687 unregister_candev(dev); 688} 689EXPORT_SYMBOL_GPL(unregister_sja1000dev); 690 691static __init int sja1000_init(void) 692{ 693 printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME); 694 695 return 0; 696} 697 698module_init(sja1000_init); 699 700static __exit void sja1000_exit(void) 701{ 702 printk(KERN_INFO "%s: driver removed\n", DRV_NAME); 703} 704 705module_exit(sja1000_exit); 706