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 uint8_t dlc; 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 = dlc = cf->can_dlc; 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 < dlc; i++) 320 priv->write_reg(priv, dreg++, cf->data[i]); 321 322 can_put_echo_skb(skb, dev, 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 cf->can_dlc = get_can_dlc(fi & 0x0F); 371 if (fi & SJA1000_FI_RTR) { 372 id |= CAN_RTR_FLAG; 373 } else { 374 for (i = 0; i < cf->can_dlc; i++) 375 cf->data[i] = priv->read_reg(priv, dreg++); 376 } 377 378 cf->can_id = id; 379 380 /* release receive buffer */ 381 sja1000_write_cmdreg(priv, CMD_RRB); 382 383 stats->rx_packets++; 384 stats->rx_bytes += cf->can_dlc; 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 stats->tx_errors++; 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 stats->rx_packets++; 493 stats->rx_bytes += cf->can_dlc; 494 netif_rx(skb); 495 496 return 0; 497 } 498 499 irqreturn_t sja1000_interrupt(int irq, void *dev_id) 500 { 501 struct net_device *dev = (struct net_device *)dev_id; 502 struct sja1000_priv *priv = netdev_priv(dev); 503 struct net_device_stats *stats = &dev->stats; 504 uint8_t isrc, status; 505 int n = 0; 506 507 if (priv->pre_irq) 508 priv->pre_irq(priv); 509 510 /* Shared interrupts and IRQ off? */ 511 if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF) 512 goto out; 513 514 while ((isrc = priv->read_reg(priv, SJA1000_IR)) && 515 (n < SJA1000_MAX_IRQ)) { 516 517 status = priv->read_reg(priv, SJA1000_SR); 518 /* check for absent controller due to hw unplug */ 519 if (status == 0xFF && sja1000_is_absent(priv)) 520 goto out; 521 522 if (isrc & IRQ_WUI) 523 netdev_warn(dev, "wakeup interrupt\n"); 524 525 if (isrc & IRQ_TI) { 526 /* transmission buffer released */ 527 if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT && 528 !(status & SR_TCS)) { 529 stats->tx_errors++; 530 can_free_echo_skb(dev, 0); 531 } else { 532 /* transmission complete */ 533 stats->tx_bytes += 534 priv->read_reg(priv, SJA1000_FI) & 0xf; 535 stats->tx_packets++; 536 can_get_echo_skb(dev, 0); 537 } 538 netif_wake_queue(dev); 539 can_led_event(dev, CAN_LED_EVENT_TX); 540 } 541 if (isrc & IRQ_RI) { 542 /* receive interrupt */ 543 while (status & SR_RBS) { 544 sja1000_rx(dev); 545 status = priv->read_reg(priv, SJA1000_SR); 546 /* check for absent controller */ 547 if (status == 0xFF && sja1000_is_absent(priv)) 548 goto out; 549 } 550 } 551 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) { 552 /* error interrupt */ 553 if (sja1000_err(dev, isrc, status)) 554 break; 555 } 556 n++; 557 } 558 out: 559 if (priv->post_irq) 560 priv->post_irq(priv); 561 562 if (n >= SJA1000_MAX_IRQ) 563 netdev_dbg(dev, "%d messages handled in ISR", n); 564 565 return (n) ? IRQ_HANDLED : IRQ_NONE; 566 } 567 EXPORT_SYMBOL_GPL(sja1000_interrupt); 568 569 static int sja1000_open(struct net_device *dev) 570 { 571 struct sja1000_priv *priv = netdev_priv(dev); 572 int err; 573 574 /* set chip into reset mode */ 575 set_reset_mode(dev); 576 577 /* common open */ 578 err = open_candev(dev); 579 if (err) 580 return err; 581 582 /* register interrupt handler, if not done by the device driver */ 583 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) { 584 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags, 585 dev->name, (void *)dev); 586 if (err) { 587 close_candev(dev); 588 return -EAGAIN; 589 } 590 } 591 592 /* init and start chi */ 593 sja1000_start(dev); 594 595 can_led_event(dev, CAN_LED_EVENT_OPEN); 596 597 netif_start_queue(dev); 598 599 return 0; 600 } 601 602 static int sja1000_close(struct net_device *dev) 603 { 604 struct sja1000_priv *priv = netdev_priv(dev); 605 606 netif_stop_queue(dev); 607 set_reset_mode(dev); 608 609 if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) 610 free_irq(dev->irq, (void *)dev); 611 612 close_candev(dev); 613 614 can_led_event(dev, CAN_LED_EVENT_STOP); 615 616 return 0; 617 } 618 619 struct net_device *alloc_sja1000dev(int sizeof_priv) 620 { 621 struct net_device *dev; 622 struct sja1000_priv *priv; 623 624 dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv, 625 SJA1000_ECHO_SKB_MAX); 626 if (!dev) 627 return NULL; 628 629 priv = netdev_priv(dev); 630 631 priv->dev = dev; 632 priv->can.bittiming_const = &sja1000_bittiming_const; 633 priv->can.do_set_bittiming = sja1000_set_bittiming; 634 priv->can.do_set_mode = sja1000_set_mode; 635 priv->can.do_get_berr_counter = sja1000_get_berr_counter; 636 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK | 637 CAN_CTRLMODE_LISTENONLY | 638 CAN_CTRLMODE_3_SAMPLES | 639 CAN_CTRLMODE_ONE_SHOT | 640 CAN_CTRLMODE_BERR_REPORTING | 641 CAN_CTRLMODE_PRESUME_ACK; 642 643 spin_lock_init(&priv->cmdreg_lock); 644 645 if (sizeof_priv) 646 priv->priv = (void *)priv + sizeof(struct sja1000_priv); 647 648 return dev; 649 } 650 EXPORT_SYMBOL_GPL(alloc_sja1000dev); 651 652 void free_sja1000dev(struct net_device *dev) 653 { 654 free_candev(dev); 655 } 656 EXPORT_SYMBOL_GPL(free_sja1000dev); 657 658 static const struct net_device_ops sja1000_netdev_ops = { 659 .ndo_open = sja1000_open, 660 .ndo_stop = sja1000_close, 661 .ndo_start_xmit = sja1000_start_xmit, 662 .ndo_change_mtu = can_change_mtu, 663 }; 664 665 int register_sja1000dev(struct net_device *dev) 666 { 667 int ret; 668 669 if (!sja1000_probe_chip(dev)) 670 return -ENODEV; 671 672 dev->flags |= IFF_ECHO; /* we support local echo */ 673 dev->netdev_ops = &sja1000_netdev_ops; 674 675 set_reset_mode(dev); 676 chipset_init(dev); 677 678 ret = register_candev(dev); 679 680 if (!ret) 681 devm_can_led_init(dev); 682 683 return ret; 684 } 685 EXPORT_SYMBOL_GPL(register_sja1000dev); 686 687 void unregister_sja1000dev(struct net_device *dev) 688 { 689 set_reset_mode(dev); 690 unregister_candev(dev); 691 } 692 EXPORT_SYMBOL_GPL(unregister_sja1000dev); 693 694 static __init int sja1000_init(void) 695 { 696 printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME); 697 698 return 0; 699 } 700 701 module_init(sja1000_init); 702 703 static __exit void sja1000_exit(void) 704 { 705 printk(KERN_INFO "%s: driver removed\n", DRV_NAME); 706 } 707 708 module_exit(sja1000_exit); 709