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 69 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>"); 70 MODULE_LICENSE("Dual BSD/GPL"); 71 MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver"); 72 73 static 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 85 static 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 99 static int sja1000_is_absent(struct sja1000_priv *priv) 100 { 101 return (priv->read_reg(priv, SJA1000_MOD) == 0xFF); 102 } 103 104 static 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 } 114 115 static 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 } 139 140 static 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 } 174 175 /* 176 * initialize SJA1000 chip: 177 * - reset chip 178 * - set output mode 179 * - set baudrate 180 * - enable interrupts 181 * - start operating mode 182 */ 183 static void chipset_init(struct net_device *dev) 184 { 185 struct sja1000_priv *priv = netdev_priv(dev); 186 187 /* 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->read_reg(priv, SJA1000_CDR) & CDR_PELICAN)) 214 chipset_init(dev); 215 216 /* Clear error counters and error code capture */ 217 priv->write_reg(priv, SJA1000_TXERR, 0x0); 218 priv->write_reg(priv, SJA1000_RXERR, 0x0); 219 priv->read_reg(priv, SJA1000_ECC); 220 221 /* leave reset mode */ 222 set_normal_mode(dev); 223 } 224 225 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode) 226 { 227 switch (mode) { 228 case CAN_MODE_START: 229 sja1000_start(dev); 230 if (netif_queue_stopped(dev)) 231 netif_wake_queue(dev); 232 break; 233 234 default: 235 return -EOPNOTSUPP; 236 } 237 238 return 0; 239 } 240 241 static int sja1000_set_bittiming(struct net_device *dev) 242 { 243 struct sja1000_priv *priv = netdev_priv(dev); 244 struct can_bittiming *bt = &priv->can.bittiming; 245 u8 btr0, btr1; 246 247 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); 248 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | 249 (((bt->phase_seg2 - 1) & 0x7) << 4); 250 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 251 btr1 |= 0x80; 252 253 netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); 254 255 priv->write_reg(priv, SJA1000_BTR0, btr0); 256 priv->write_reg(priv, SJA1000_BTR1, btr1); 257 258 return 0; 259 } 260 261 static int sja1000_get_berr_counter(const struct net_device *dev, 262 struct can_berr_counter *bec) 263 { 264 struct sja1000_priv *priv = netdev_priv(dev); 265 266 bec->txerr = priv->read_reg(priv, SJA1000_TXERR); 267 bec->rxerr = priv->read_reg(priv, SJA1000_RXERR); 268 269 return 0; 270 } 271 272 /* 273 * transmit a CAN message 274 * message layout in the sk_buff should be like this: 275 * xx xx xx xx ff ll 00 11 22 33 44 55 66 77 276 * [ can-id ] [flags] [len] [can data (up to 8 bytes] 277 */ 278 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb, 279 struct net_device *dev) 280 { 281 struct sja1000_priv *priv = netdev_priv(dev); 282 struct can_frame *cf = (struct can_frame *)skb->data; 283 uint8_t fi; 284 uint8_t dlc; 285 canid_t id; 286 uint8_t dreg; 287 u8 cmd_reg_val = 0x00; 288 int i; 289 290 if (can_dropped_invalid_skb(dev, skb)) 291 return NETDEV_TX_OK; 292 293 netif_stop_queue(dev); 294 295 fi = dlc = cf->can_dlc; 296 id = cf->can_id; 297 298 if (id & CAN_RTR_FLAG) 299 fi |= SJA1000_FI_RTR; 300 301 if (id & CAN_EFF_FLAG) { 302 fi |= SJA1000_FI_FF; 303 dreg = SJA1000_EFF_BUF; 304 priv->write_reg(priv, SJA1000_FI, fi); 305 priv->write_reg(priv, SJA1000_ID1, (id & 0x1fe00000) >> 21); 306 priv->write_reg(priv, SJA1000_ID2, (id & 0x001fe000) >> 13); 307 priv->write_reg(priv, SJA1000_ID3, (id & 0x00001fe0) >> 5); 308 priv->write_reg(priv, SJA1000_ID4, (id & 0x0000001f) << 3); 309 } else { 310 dreg = SJA1000_SFF_BUF; 311 priv->write_reg(priv, SJA1000_FI, fi); 312 priv->write_reg(priv, SJA1000_ID1, (id & 0x000007f8) >> 3); 313 priv->write_reg(priv, SJA1000_ID2, (id & 0x00000007) << 5); 314 } 315 316 for (i = 0; i < dlc; i++) 317 priv->write_reg(priv, dreg++, cf->data[i]); 318 319 can_put_echo_skb(skb, dev, 0); 320 321 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT) 322 cmd_reg_val |= CMD_AT; 323 324 if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) 325 cmd_reg_val |= CMD_SRR; 326 else 327 cmd_reg_val |= CMD_TR; 328 329 sja1000_write_cmdreg(priv, cmd_reg_val); 330 331 return NETDEV_TX_OK; 332 } 333 334 static void sja1000_rx(struct net_device *dev) 335 { 336 struct sja1000_priv *priv = netdev_priv(dev); 337 struct net_device_stats *stats = &dev->stats; 338 struct can_frame *cf; 339 struct sk_buff *skb; 340 uint8_t fi; 341 uint8_t dreg; 342 canid_t id; 343 int i; 344 345 /* create zero'ed CAN frame buffer */ 346 skb = alloc_can_skb(dev, &cf); 347 if (skb == NULL) 348 return; 349 350 fi = priv->read_reg(priv, SJA1000_FI); 351 352 if (fi & SJA1000_FI_FF) { 353 /* extended frame format (EFF) */ 354 dreg = SJA1000_EFF_BUF; 355 id = (priv->read_reg(priv, SJA1000_ID1) << 21) 356 | (priv->read_reg(priv, SJA1000_ID2) << 13) 357 | (priv->read_reg(priv, SJA1000_ID3) << 5) 358 | (priv->read_reg(priv, SJA1000_ID4) >> 3); 359 id |= CAN_EFF_FLAG; 360 } else { 361 /* standard frame format (SFF) */ 362 dreg = SJA1000_SFF_BUF; 363 id = (priv->read_reg(priv, SJA1000_ID1) << 3) 364 | (priv->read_reg(priv, SJA1000_ID2) >> 5); 365 } 366 367 cf->can_dlc = get_can_dlc(fi & 0x0F); 368 if (fi & SJA1000_FI_RTR) { 369 id |= CAN_RTR_FLAG; 370 } else { 371 for (i = 0; i < cf->can_dlc; i++) 372 cf->data[i] = priv->read_reg(priv, dreg++); 373 } 374 375 cf->can_id = id; 376 377 /* release receive buffer */ 378 sja1000_write_cmdreg(priv, CMD_RRB); 379 380 stats->rx_packets++; 381 stats->rx_bytes += cf->can_dlc; 382 netif_rx(skb); 383 384 can_led_event(dev, CAN_LED_EVENT_RX); 385 } 386 387 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) 388 { 389 struct sja1000_priv *priv = netdev_priv(dev); 390 struct net_device_stats *stats = &dev->stats; 391 struct can_frame *cf; 392 struct sk_buff *skb; 393 enum can_state state = priv->can.state; 394 enum can_state rx_state, tx_state; 395 unsigned int rxerr, txerr; 396 uint8_t ecc, alc; 397 398 skb = alloc_can_err_skb(dev, &cf); 399 if (skb == NULL) 400 return -ENOMEM; 401 402 txerr = priv->read_reg(priv, SJA1000_TXERR); 403 rxerr = priv->read_reg(priv, SJA1000_RXERR); 404 405 cf->data[6] = txerr; 406 cf->data[7] = rxerr; 407 408 if (isrc & IRQ_DOI) { 409 /* data overrun interrupt */ 410 netdev_dbg(dev, "data overrun interrupt\n"); 411 cf->can_id |= CAN_ERR_CRTL; 412 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; 413 stats->rx_over_errors++; 414 stats->rx_errors++; 415 sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */ 416 } 417 418 if (isrc & IRQ_EI) { 419 /* error warning interrupt */ 420 netdev_dbg(dev, "error warning interrupt\n"); 421 422 if (status & SR_BS) 423 state = CAN_STATE_BUS_OFF; 424 else if (status & SR_ES) 425 state = CAN_STATE_ERROR_WARNING; 426 else 427 state = CAN_STATE_ERROR_ACTIVE; 428 } 429 if (isrc & IRQ_BEI) { 430 /* bus error interrupt */ 431 priv->can.can_stats.bus_error++; 432 stats->rx_errors++; 433 434 ecc = priv->read_reg(priv, SJA1000_ECC); 435 436 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 437 438 switch (ecc & ECC_MASK) { 439 case ECC_BIT: 440 cf->data[2] |= CAN_ERR_PROT_BIT; 441 break; 442 case ECC_FORM: 443 cf->data[2] |= CAN_ERR_PROT_FORM; 444 break; 445 case ECC_STUFF: 446 cf->data[2] |= CAN_ERR_PROT_STUFF; 447 break; 448 default: 449 cf->data[2] |= CAN_ERR_PROT_UNSPEC; 450 cf->data[3] = ecc & ECC_SEG; 451 break; 452 } 453 /* Error occurred during transmission? */ 454 if ((ecc & ECC_DIR) == 0) 455 cf->data[2] |= CAN_ERR_PROT_TX; 456 } 457 if (isrc & IRQ_EPI) { 458 /* error passive interrupt */ 459 netdev_dbg(dev, "error passive interrupt\n"); 460 461 if (state == CAN_STATE_ERROR_PASSIVE) 462 state = CAN_STATE_ERROR_WARNING; 463 else 464 state = CAN_STATE_ERROR_PASSIVE; 465 } 466 if (isrc & IRQ_ALI) { 467 /* arbitration lost interrupt */ 468 netdev_dbg(dev, "arbitration lost interrupt\n"); 469 alc = priv->read_reg(priv, SJA1000_ALC); 470 priv->can.can_stats.arbitration_lost++; 471 stats->tx_errors++; 472 cf->can_id |= CAN_ERR_LOSTARB; 473 cf->data[0] = alc & 0x1f; 474 } 475 476 if (state != priv->can.state) { 477 tx_state = txerr >= rxerr ? state : 0; 478 rx_state = txerr <= rxerr ? state : 0; 479 480 can_change_state(dev, cf, tx_state, rx_state); 481 482 if(state == CAN_STATE_BUS_OFF) 483 can_bus_off(dev); 484 } 485 486 stats->rx_packets++; 487 stats->rx_bytes += cf->can_dlc; 488 netif_rx(skb); 489 490 return 0; 491 } 492 493 irqreturn_t sja1000_interrupt(int irq, void *dev_id) 494 { 495 struct net_device *dev = (struct net_device *)dev_id; 496 struct sja1000_priv *priv = netdev_priv(dev); 497 struct net_device_stats *stats = &dev->stats; 498 uint8_t isrc, status; 499 int n = 0; 500 501 if (priv->pre_irq) 502 priv->pre_irq(priv); 503 504 /* Shared interrupts and IRQ off? */ 505 if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF) 506 goto out; 507 508 while ((isrc = priv->read_reg(priv, SJA1000_IR)) && 509 (n < SJA1000_MAX_IRQ)) { 510 511 status = priv->read_reg(priv, SJA1000_SR); 512 /* check for absent controller due to hw unplug */ 513 if (status == 0xFF && sja1000_is_absent(priv)) 514 goto out; 515 516 if (isrc & IRQ_WUI) 517 netdev_warn(dev, "wakeup interrupt\n"); 518 519 if (isrc & IRQ_TI) { 520 /* transmission buffer released */ 521 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT && 522 !(status & SR_TCS)) { 523 stats->tx_errors++; 524 can_free_echo_skb(dev, 0); 525 } else { 526 /* transmission complete */ 527 stats->tx_bytes += 528 priv->read_reg(priv, SJA1000_FI) & 0xf; 529 stats->tx_packets++; 530 can_get_echo_skb(dev, 0); 531 } 532 netif_wake_queue(dev); 533 can_led_event(dev, CAN_LED_EVENT_TX); 534 } 535 if (isrc & IRQ_RI) { 536 /* receive interrupt */ 537 while (status & SR_RBS) { 538 sja1000_rx(dev); 539 status = priv->read_reg(priv, SJA1000_SR); 540 /* check for absent controller */ 541 if (status == 0xFF && sja1000_is_absent(priv)) 542 goto out; 543 } 544 } 545 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) { 546 /* error interrupt */ 547 if (sja1000_err(dev, isrc, status)) 548 break; 549 } 550 n++; 551 } 552 out: 553 if (priv->post_irq) 554 priv->post_irq(priv); 555 556 if (n >= SJA1000_MAX_IRQ) 557 netdev_dbg(dev, "%d messages handled in ISR", n); 558 559 return (n) ? IRQ_HANDLED : IRQ_NONE; 560 } 561 EXPORT_SYMBOL_GPL(sja1000_interrupt); 562 563 static int sja1000_open(struct net_device *dev) 564 { 565 struct sja1000_priv *priv = netdev_priv(dev); 566 int err; 567 568 /* set chip into reset mode */ 569 set_reset_mode(dev); 570 571 /* common open */ 572 err = open_candev(dev); 573 if (err) 574 return err; 575 576 /* register interrupt handler, if not done by the device driver */ 577 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) { 578 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags, 579 dev->name, (void *)dev); 580 if (err) { 581 close_candev(dev); 582 return -EAGAIN; 583 } 584 } 585 586 /* init and start chi */ 587 sja1000_start(dev); 588 589 can_led_event(dev, CAN_LED_EVENT_OPEN); 590 591 netif_start_queue(dev); 592 593 return 0; 594 } 595 596 static int sja1000_close(struct net_device *dev) 597 { 598 struct sja1000_priv *priv = netdev_priv(dev); 599 600 netif_stop_queue(dev); 601 set_reset_mode(dev); 602 603 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) 604 free_irq(dev->irq, (void *)dev); 605 606 close_candev(dev); 607 608 can_led_event(dev, CAN_LED_EVENT_STOP); 609 610 return 0; 611 } 612 613 struct net_device *alloc_sja1000dev(int sizeof_priv) 614 { 615 struct net_device *dev; 616 struct sja1000_priv *priv; 617 618 dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv, 619 SJA1000_ECHO_SKB_MAX); 620 if (!dev) 621 return NULL; 622 623 priv = netdev_priv(dev); 624 625 priv->dev = dev; 626 priv->can.bittiming_const = &sja1000_bittiming_const; 627 priv->can.do_set_bittiming = sja1000_set_bittiming; 628 priv->can.do_set_mode = sja1000_set_mode; 629 priv->can.do_get_berr_counter = sja1000_get_berr_counter; 630 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | 631 CAN_CTRLMODE_LISTENONLY | 632 CAN_CTRLMODE_3_SAMPLES | 633 CAN_CTRLMODE_ONE_SHOT | 634 CAN_CTRLMODE_BERR_REPORTING | 635 CAN_CTRLMODE_PRESUME_ACK; 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 } 644 EXPORT_SYMBOL_GPL(alloc_sja1000dev); 645 646 void free_sja1000dev(struct net_device *dev) 647 { 648 free_candev(dev); 649 } 650 EXPORT_SYMBOL_GPL(free_sja1000dev); 651 652 static 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 }; 658 659 int 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 } 679 EXPORT_SYMBOL_GPL(register_sja1000dev); 680 681 void unregister_sja1000dev(struct net_device *dev) 682 { 683 set_reset_mode(dev); 684 unregister_candev(dev); 685 } 686 EXPORT_SYMBOL_GPL(unregister_sja1000dev); 687 688 static __init int sja1000_init(void) 689 { 690 printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME); 691 692 return 0; 693 } 694 695 module_init(sja1000_init); 696 697 static __exit void sja1000_exit(void) 698 { 699 printk(KERN_INFO "%s: driver removed\n", DRV_NAME); 700 } 701 702 module_exit(sja1000_exit); 703