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 /* clear interrupt flags */ 222 priv->read_reg(priv, SJA1000_IR); 223 224 /* leave reset mode */ 225 set_normal_mode(dev); 226 } 227 228 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode) 229 { 230 switch (mode) { 231 case CAN_MODE_START: 232 sja1000_start(dev); 233 if (netif_queue_stopped(dev)) 234 netif_wake_queue(dev); 235 break; 236 237 default: 238 return -EOPNOTSUPP; 239 } 240 241 return 0; 242 } 243 244 static int sja1000_set_bittiming(struct net_device *dev) 245 { 246 struct sja1000_priv *priv = netdev_priv(dev); 247 struct can_bittiming *bt = &priv->can.bittiming; 248 u8 btr0, btr1; 249 250 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); 251 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | 252 (((bt->phase_seg2 - 1) & 0x7) << 4); 253 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 254 btr1 |= 0x80; 255 256 netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); 257 258 priv->write_reg(priv, SJA1000_BTR0, btr0); 259 priv->write_reg(priv, SJA1000_BTR1, btr1); 260 261 return 0; 262 } 263 264 static int sja1000_get_berr_counter(const struct net_device *dev, 265 struct can_berr_counter *bec) 266 { 267 struct sja1000_priv *priv = netdev_priv(dev); 268 269 bec->txerr = priv->read_reg(priv, SJA1000_TXERR); 270 bec->rxerr = priv->read_reg(priv, SJA1000_RXERR); 271 272 return 0; 273 } 274 275 /* 276 * transmit a CAN message 277 * message layout in the sk_buff should be like this: 278 * xx xx xx xx ff ll 00 11 22 33 44 55 66 77 279 * [ can-id ] [flags] [len] [can data (up to 8 bytes] 280 */ 281 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb, 282 struct net_device *dev) 283 { 284 struct sja1000_priv *priv = netdev_priv(dev); 285 struct can_frame *cf = (struct can_frame *)skb->data; 286 uint8_t fi; 287 canid_t id; 288 uint8_t dreg; 289 u8 cmd_reg_val = 0x00; 290 int i; 291 292 if (can_dropped_invalid_skb(dev, skb)) 293 return NETDEV_TX_OK; 294 295 netif_stop_queue(dev); 296 297 fi = can_get_cc_dlc(cf, priv->can.ctrlmode); 298 id = cf->can_id; 299 300 if (id & CAN_RTR_FLAG) 301 fi |= SJA1000_FI_RTR; 302 303 if (id & CAN_EFF_FLAG) { 304 fi |= SJA1000_FI_FF; 305 dreg = SJA1000_EFF_BUF; 306 priv->write_reg(priv, SJA1000_FI, fi); 307 priv->write_reg(priv, SJA1000_ID1, (id & 0x1fe00000) >> 21); 308 priv->write_reg(priv, SJA1000_ID2, (id & 0x001fe000) >> 13); 309 priv->write_reg(priv, SJA1000_ID3, (id & 0x00001fe0) >> 5); 310 priv->write_reg(priv, SJA1000_ID4, (id & 0x0000001f) << 3); 311 } else { 312 dreg = SJA1000_SFF_BUF; 313 priv->write_reg(priv, SJA1000_FI, fi); 314 priv->write_reg(priv, SJA1000_ID1, (id & 0x000007f8) >> 3); 315 priv->write_reg(priv, SJA1000_ID2, (id & 0x00000007) << 5); 316 } 317 318 for (i = 0; i < cf->len; i++) 319 priv->write_reg(priv, dreg++, cf->data[i]); 320 321 can_put_echo_skb(skb, dev, 0, 0); 322 323 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT) 324 cmd_reg_val |= CMD_AT; 325 326 if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) 327 cmd_reg_val |= CMD_SRR; 328 else 329 cmd_reg_val |= CMD_TR; 330 331 sja1000_write_cmdreg(priv, cmd_reg_val); 332 333 return NETDEV_TX_OK; 334 } 335 336 static void sja1000_rx(struct net_device *dev) 337 { 338 struct sja1000_priv *priv = netdev_priv(dev); 339 struct net_device_stats *stats = &dev->stats; 340 struct can_frame *cf; 341 struct sk_buff *skb; 342 uint8_t fi; 343 uint8_t dreg; 344 canid_t id; 345 int i; 346 347 /* create zero'ed CAN frame buffer */ 348 skb = alloc_can_skb(dev, &cf); 349 if (skb == NULL) 350 return; 351 352 fi = priv->read_reg(priv, SJA1000_FI); 353 354 if (fi & SJA1000_FI_FF) { 355 /* extended frame format (EFF) */ 356 dreg = SJA1000_EFF_BUF; 357 id = (priv->read_reg(priv, SJA1000_ID1) << 21) 358 | (priv->read_reg(priv, SJA1000_ID2) << 13) 359 | (priv->read_reg(priv, SJA1000_ID3) << 5) 360 | (priv->read_reg(priv, SJA1000_ID4) >> 3); 361 id |= CAN_EFF_FLAG; 362 } else { 363 /* standard frame format (SFF) */ 364 dreg = SJA1000_SFF_BUF; 365 id = (priv->read_reg(priv, SJA1000_ID1) << 3) 366 | (priv->read_reg(priv, SJA1000_ID2) >> 5); 367 } 368 369 can_frame_set_cc_len(cf, fi & 0x0F, priv->can.ctrlmode); 370 if (fi & SJA1000_FI_RTR) { 371 id |= CAN_RTR_FLAG; 372 } else { 373 for (i = 0; i < cf->len; i++) 374 cf->data[i] = priv->read_reg(priv, dreg++); 375 376 stats->rx_bytes += cf->len; 377 } 378 stats->rx_packets++; 379 380 cf->can_id = id; 381 382 /* release receive buffer */ 383 sja1000_write_cmdreg(priv, CMD_RRB); 384 385 netif_rx(skb); 386 387 can_led_event(dev, CAN_LED_EVENT_RX); 388 } 389 390 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status) 391 { 392 struct sja1000_priv *priv = netdev_priv(dev); 393 struct net_device_stats *stats = &dev->stats; 394 struct can_frame *cf; 395 struct sk_buff *skb; 396 enum can_state state = priv->can.state; 397 enum can_state rx_state, tx_state; 398 unsigned int rxerr, txerr; 399 uint8_t ecc, alc; 400 401 skb = alloc_can_err_skb(dev, &cf); 402 if (skb == NULL) 403 return -ENOMEM; 404 405 txerr = priv->read_reg(priv, SJA1000_TXERR); 406 rxerr = priv->read_reg(priv, SJA1000_RXERR); 407 408 cf->data[6] = txerr; 409 cf->data[7] = rxerr; 410 411 if (isrc & IRQ_DOI) { 412 /* data overrun interrupt */ 413 netdev_dbg(dev, "data overrun interrupt\n"); 414 cf->can_id |= CAN_ERR_CRTL; 415 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; 416 stats->rx_over_errors++; 417 stats->rx_errors++; 418 sja1000_write_cmdreg(priv, CMD_CDO); /* clear bit */ 419 } 420 421 if (isrc & IRQ_EI) { 422 /* error warning interrupt */ 423 netdev_dbg(dev, "error warning interrupt\n"); 424 425 if (status & SR_BS) 426 state = CAN_STATE_BUS_OFF; 427 else if (status & SR_ES) 428 state = CAN_STATE_ERROR_WARNING; 429 else 430 state = CAN_STATE_ERROR_ACTIVE; 431 } 432 if (isrc & IRQ_BEI) { 433 /* bus error interrupt */ 434 priv->can.can_stats.bus_error++; 435 stats->rx_errors++; 436 437 ecc = priv->read_reg(priv, SJA1000_ECC); 438 439 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 440 441 /* set error type */ 442 switch (ecc & ECC_MASK) { 443 case ECC_BIT: 444 cf->data[2] |= CAN_ERR_PROT_BIT; 445 break; 446 case ECC_FORM: 447 cf->data[2] |= CAN_ERR_PROT_FORM; 448 break; 449 case ECC_STUFF: 450 cf->data[2] |= CAN_ERR_PROT_STUFF; 451 break; 452 default: 453 break; 454 } 455 456 /* set error location */ 457 cf->data[3] = ecc & ECC_SEG; 458 459 /* Error occurred during transmission? */ 460 if ((ecc & ECC_DIR) == 0) 461 cf->data[2] |= CAN_ERR_PROT_TX; 462 } 463 if (isrc & IRQ_EPI) { 464 /* error passive interrupt */ 465 netdev_dbg(dev, "error passive interrupt\n"); 466 467 if (state == CAN_STATE_ERROR_PASSIVE) 468 state = CAN_STATE_ERROR_WARNING; 469 else 470 state = CAN_STATE_ERROR_PASSIVE; 471 } 472 if (isrc & IRQ_ALI) { 473 /* arbitration lost interrupt */ 474 netdev_dbg(dev, "arbitration lost interrupt\n"); 475 alc = priv->read_reg(priv, SJA1000_ALC); 476 priv->can.can_stats.arbitration_lost++; 477 cf->can_id |= CAN_ERR_LOSTARB; 478 cf->data[0] = alc & 0x1f; 479 } 480 481 if (state != priv->can.state) { 482 tx_state = txerr >= rxerr ? state : 0; 483 rx_state = txerr <= rxerr ? state : 0; 484 485 can_change_state(dev, cf, tx_state, rx_state); 486 487 if(state == CAN_STATE_BUS_OFF) 488 can_bus_off(dev); 489 } 490 491 netif_rx(skb); 492 493 return 0; 494 } 495 496 irqreturn_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, NULL); 528 } else { 529 /* transmission complete */ 530 stats->tx_bytes += can_get_echo_skb(dev, 0, NULL); 531 stats->tx_packets++; 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 } 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 can_led_event(dev, CAN_LED_EVENT_OPEN); 591 592 netif_start_queue(dev); 593 594 return 0; 595 } 596 597 static 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 } 613 614 struct 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 CAN_CTRLMODE_PRESUME_ACK | 637 CAN_CTRLMODE_CC_LEN8_DLC; 638 639 spin_lock_init(&priv->cmdreg_lock); 640 641 if (sizeof_priv) 642 priv->priv = (void *)priv + sizeof(struct sja1000_priv); 643 644 return dev; 645 } 646 EXPORT_SYMBOL_GPL(alloc_sja1000dev); 647 648 void free_sja1000dev(struct net_device *dev) 649 { 650 free_candev(dev); 651 } 652 EXPORT_SYMBOL_GPL(free_sja1000dev); 653 654 static const struct net_device_ops sja1000_netdev_ops = { 655 .ndo_open = sja1000_open, 656 .ndo_stop = sja1000_close, 657 .ndo_start_xmit = sja1000_start_xmit, 658 .ndo_change_mtu = can_change_mtu, 659 }; 660 661 int register_sja1000dev(struct net_device *dev) 662 { 663 int ret; 664 665 if (!sja1000_probe_chip(dev)) 666 return -ENODEV; 667 668 dev->flags |= IFF_ECHO; /* we support local echo */ 669 dev->netdev_ops = &sja1000_netdev_ops; 670 671 set_reset_mode(dev); 672 chipset_init(dev); 673 674 ret = register_candev(dev); 675 676 if (!ret) 677 devm_can_led_init(dev); 678 679 return ret; 680 } 681 EXPORT_SYMBOL_GPL(register_sja1000dev); 682 683 void unregister_sja1000dev(struct net_device *dev) 684 { 685 set_reset_mode(dev); 686 unregister_candev(dev); 687 } 688 EXPORT_SYMBOL_GPL(unregister_sja1000dev); 689 690 static __init int sja1000_init(void) 691 { 692 printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME); 693 694 return 0; 695 } 696 697 module_init(sja1000_init); 698 699 static __exit void sja1000_exit(void) 700 { 701 printk(KERN_INFO "%s: driver removed\n", DRV_NAME); 702 } 703 704 module_exit(sja1000_exit); 705