1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * CAN driver for PEAK System USB adapters 4 * Derived from the PCAN project file driver/src/pcan_usb_core.c 5 * 6 * Copyright (C) 2003-2010 PEAK System-Technik GmbH 7 * Copyright (C) 2010-2012 Stephane Grosjean <s.grosjean@peak-system.com> 8 * 9 * Many thanks to Klaus Hitschler <klaus.hitschler@gmx.de> 10 */ 11 #include <linux/init.h> 12 #include <linux/signal.h> 13 #include <linux/slab.h> 14 #include <linux/module.h> 15 #include <linux/netdevice.h> 16 #include <linux/usb.h> 17 18 #include <linux/can.h> 19 #include <linux/can/dev.h> 20 #include <linux/can/error.h> 21 22 #include "pcan_usb_core.h" 23 24 MODULE_AUTHOR("Stephane Grosjean <s.grosjean@peak-system.com>"); 25 MODULE_DESCRIPTION("CAN driver for PEAK-System USB adapters"); 26 MODULE_LICENSE("GPL v2"); 27 28 /* Table of devices that work with this driver */ 29 static struct usb_device_id peak_usb_table[] = { 30 {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USB_PRODUCT_ID)}, 31 {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USBPRO_PRODUCT_ID)}, 32 {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USBFD_PRODUCT_ID)}, 33 {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USBPROFD_PRODUCT_ID)}, 34 {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USBCHIP_PRODUCT_ID)}, 35 {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USBX6_PRODUCT_ID)}, 36 {} /* Terminating entry */ 37 }; 38 39 MODULE_DEVICE_TABLE(usb, peak_usb_table); 40 41 /* List of supported PCAN-USB adapters (NULL terminated list) */ 42 static const struct peak_usb_adapter *const peak_usb_adapters_list[] = { 43 &pcan_usb, 44 &pcan_usb_pro, 45 &pcan_usb_fd, 46 &pcan_usb_pro_fd, 47 &pcan_usb_chip, 48 &pcan_usb_x6, 49 }; 50 51 /* 52 * dump memory 53 */ 54 #define DUMP_WIDTH 16 55 void pcan_dump_mem(char *prompt, void *p, int l) 56 { 57 pr_info("%s dumping %s (%d bytes):\n", 58 PCAN_USB_DRIVER_NAME, prompt ? prompt : "memory", l); 59 print_hex_dump(KERN_INFO, PCAN_USB_DRIVER_NAME " ", DUMP_PREFIX_NONE, 60 DUMP_WIDTH, 1, p, l, false); 61 } 62 63 /* 64 * initialize a time_ref object with usb adapter own settings 65 */ 66 void peak_usb_init_time_ref(struct peak_time_ref *time_ref, 67 const struct peak_usb_adapter *adapter) 68 { 69 if (time_ref) { 70 memset(time_ref, 0, sizeof(struct peak_time_ref)); 71 time_ref->adapter = adapter; 72 } 73 } 74 75 /* 76 * sometimes, another now may be more recent than current one... 77 */ 78 void peak_usb_update_ts_now(struct peak_time_ref *time_ref, u32 ts_now) 79 { 80 time_ref->ts_dev_2 = ts_now; 81 82 /* should wait at least two passes before computing */ 83 if (ktime_to_ns(time_ref->tv_host) > 0) { 84 u32 delta_ts = time_ref->ts_dev_2 - time_ref->ts_dev_1; 85 86 if (time_ref->ts_dev_2 < time_ref->ts_dev_1) 87 delta_ts &= (1 << time_ref->adapter->ts_used_bits) - 1; 88 89 time_ref->ts_total += delta_ts; 90 } 91 } 92 93 /* 94 * register device timestamp as now 95 */ 96 void peak_usb_set_ts_now(struct peak_time_ref *time_ref, u32 ts_now) 97 { 98 if (ktime_to_ns(time_ref->tv_host_0) == 0) { 99 /* use monotonic clock to correctly compute further deltas */ 100 time_ref->tv_host_0 = ktime_get(); 101 time_ref->tv_host = ktime_set(0, 0); 102 } else { 103 /* 104 * delta_us should not be >= 2^32 => delta should be < 4294s 105 * handle 32-bits wrapping here: if count of s. reaches 4200, 106 * reset counters and change time base 107 */ 108 if (ktime_to_ns(time_ref->tv_host)) { 109 ktime_t delta = ktime_sub(time_ref->tv_host, 110 time_ref->tv_host_0); 111 if (ktime_to_ns(delta) > (4200ull * NSEC_PER_SEC)) { 112 time_ref->tv_host_0 = time_ref->tv_host; 113 time_ref->ts_total = 0; 114 } 115 } 116 117 time_ref->tv_host = ktime_get(); 118 time_ref->tick_count++; 119 } 120 121 time_ref->ts_dev_1 = time_ref->ts_dev_2; 122 peak_usb_update_ts_now(time_ref, ts_now); 123 } 124 125 /* 126 * compute time according to current ts and time_ref data 127 */ 128 void peak_usb_get_ts_time(struct peak_time_ref *time_ref, u32 ts, ktime_t *time) 129 { 130 /* protect from getting time before setting now */ 131 if (ktime_to_ns(time_ref->tv_host)) { 132 u64 delta_us; 133 s64 delta_ts = 0; 134 135 /* General case: dev_ts_1 < dev_ts_2 < ts, with: 136 * 137 * - dev_ts_1 = previous sync timestamp 138 * - dev_ts_2 = last sync timestamp 139 * - ts = event timestamp 140 * - ts_period = known sync period (theoretical) 141 * ~ dev_ts2 - dev_ts1 142 * *but*: 143 * 144 * - time counters wrap (see adapter->ts_used_bits) 145 * - sometimes, dev_ts_1 < ts < dev_ts2 146 * 147 * "normal" case (sync time counters increase): 148 * must take into account case when ts wraps (tsw) 149 * 150 * < ts_period > < > 151 * | | | 152 * ---+--------+----+-------0-+--+--> 153 * ts_dev_1 | ts_dev_2 | 154 * ts tsw 155 */ 156 if (time_ref->ts_dev_1 < time_ref->ts_dev_2) { 157 /* case when event time (tsw) wraps */ 158 if (ts < time_ref->ts_dev_1) 159 delta_ts = BIT_ULL(time_ref->adapter->ts_used_bits); 160 161 /* Otherwise, sync time counter (ts_dev_2) has wrapped: 162 * handle case when event time (tsn) hasn't. 163 * 164 * < ts_period > < > 165 * | | | 166 * ---+--------+--0-+---------+--+--> 167 * ts_dev_1 | ts_dev_2 | 168 * tsn ts 169 */ 170 } else if (time_ref->ts_dev_1 < ts) { 171 delta_ts = -BIT_ULL(time_ref->adapter->ts_used_bits); 172 } 173 174 /* add delay between last sync and event timestamps */ 175 delta_ts += (signed int)(ts - time_ref->ts_dev_2); 176 177 /* add time from beginning to last sync */ 178 delta_ts += time_ref->ts_total; 179 180 /* convert ticks number into microseconds */ 181 delta_us = delta_ts * time_ref->adapter->us_per_ts_scale; 182 delta_us >>= time_ref->adapter->us_per_ts_shift; 183 184 *time = ktime_add_us(time_ref->tv_host_0, delta_us); 185 } else { 186 *time = ktime_get(); 187 } 188 } 189 190 /* 191 * post received skb after having set any hw timestamp 192 */ 193 int peak_usb_netif_rx(struct sk_buff *skb, 194 struct peak_time_ref *time_ref, u32 ts_low) 195 { 196 struct skb_shared_hwtstamps *hwts = skb_hwtstamps(skb); 197 198 peak_usb_get_ts_time(time_ref, ts_low, &hwts->hwtstamp); 199 200 return netif_rx(skb); 201 } 202 203 /* 204 * callback for bulk Rx urb 205 */ 206 static void peak_usb_read_bulk_callback(struct urb *urb) 207 { 208 struct peak_usb_device *dev = urb->context; 209 struct net_device *netdev; 210 int err; 211 212 netdev = dev->netdev; 213 214 if (!netif_device_present(netdev)) 215 return; 216 217 /* check reception status */ 218 switch (urb->status) { 219 case 0: 220 /* success */ 221 break; 222 223 case -EILSEQ: 224 case -ENOENT: 225 case -ECONNRESET: 226 case -ESHUTDOWN: 227 return; 228 229 default: 230 if (net_ratelimit()) 231 netdev_err(netdev, 232 "Rx urb aborted (%d)\n", urb->status); 233 goto resubmit_urb; 234 } 235 236 /* protect from any incoming empty msgs */ 237 if ((urb->actual_length > 0) && (dev->adapter->dev_decode_buf)) { 238 /* handle these kinds of msgs only if _start callback called */ 239 if (dev->state & PCAN_USB_STATE_STARTED) { 240 err = dev->adapter->dev_decode_buf(dev, urb); 241 if (err) 242 pcan_dump_mem("received usb message", 243 urb->transfer_buffer, 244 urb->transfer_buffer_length); 245 } 246 } 247 248 resubmit_urb: 249 usb_fill_bulk_urb(urb, dev->udev, 250 usb_rcvbulkpipe(dev->udev, dev->ep_msg_in), 251 urb->transfer_buffer, dev->adapter->rx_buffer_size, 252 peak_usb_read_bulk_callback, dev); 253 254 usb_anchor_urb(urb, &dev->rx_submitted); 255 err = usb_submit_urb(urb, GFP_ATOMIC); 256 if (!err) 257 return; 258 259 usb_unanchor_urb(urb); 260 261 if (err == -ENODEV) 262 netif_device_detach(netdev); 263 else 264 netdev_err(netdev, "failed resubmitting read bulk urb: %d\n", 265 err); 266 } 267 268 /* 269 * callback for bulk Tx urb 270 */ 271 static void peak_usb_write_bulk_callback(struct urb *urb) 272 { 273 struct peak_tx_urb_context *context = urb->context; 274 struct peak_usb_device *dev; 275 struct net_device *netdev; 276 277 BUG_ON(!context); 278 279 dev = context->dev; 280 netdev = dev->netdev; 281 282 atomic_dec(&dev->active_tx_urbs); 283 284 if (!netif_device_present(netdev)) 285 return; 286 287 /* check tx status */ 288 switch (urb->status) { 289 case 0: 290 /* transmission complete */ 291 netdev->stats.tx_packets++; 292 netdev->stats.tx_bytes += context->data_len; 293 294 /* prevent tx timeout */ 295 netif_trans_update(netdev); 296 break; 297 298 default: 299 if (net_ratelimit()) 300 netdev_err(netdev, "Tx urb aborted (%d)\n", 301 urb->status); 302 case -EPROTO: 303 case -ENOENT: 304 case -ECONNRESET: 305 case -ESHUTDOWN: 306 307 break; 308 } 309 310 /* should always release echo skb and corresponding context */ 311 can_get_echo_skb(netdev, context->echo_index); 312 context->echo_index = PCAN_USB_MAX_TX_URBS; 313 314 /* do wakeup tx queue in case of success only */ 315 if (!urb->status) 316 netif_wake_queue(netdev); 317 } 318 319 /* 320 * called by netdev to send one skb on the CAN interface. 321 */ 322 static netdev_tx_t peak_usb_ndo_start_xmit(struct sk_buff *skb, 323 struct net_device *netdev) 324 { 325 struct peak_usb_device *dev = netdev_priv(netdev); 326 struct peak_tx_urb_context *context = NULL; 327 struct net_device_stats *stats = &netdev->stats; 328 struct canfd_frame *cfd = (struct canfd_frame *)skb->data; 329 struct urb *urb; 330 u8 *obuf; 331 int i, err; 332 size_t size = dev->adapter->tx_buffer_size; 333 334 if (can_dropped_invalid_skb(netdev, skb)) 335 return NETDEV_TX_OK; 336 337 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) 338 if (dev->tx_contexts[i].echo_index == PCAN_USB_MAX_TX_URBS) { 339 context = dev->tx_contexts + i; 340 break; 341 } 342 343 if (!context) { 344 /* should not occur except during restart */ 345 return NETDEV_TX_BUSY; 346 } 347 348 urb = context->urb; 349 obuf = urb->transfer_buffer; 350 351 err = dev->adapter->dev_encode_msg(dev, skb, obuf, &size); 352 if (err) { 353 if (net_ratelimit()) 354 netdev_err(netdev, "packet dropped\n"); 355 dev_kfree_skb(skb); 356 stats->tx_dropped++; 357 return NETDEV_TX_OK; 358 } 359 360 context->echo_index = i; 361 362 /* Note: this works with CANFD frames too */ 363 context->data_len = cfd->len; 364 365 usb_anchor_urb(urb, &dev->tx_submitted); 366 367 can_put_echo_skb(skb, netdev, context->echo_index); 368 369 atomic_inc(&dev->active_tx_urbs); 370 371 err = usb_submit_urb(urb, GFP_ATOMIC); 372 if (err) { 373 can_free_echo_skb(netdev, context->echo_index); 374 375 usb_unanchor_urb(urb); 376 377 /* this context is not used in fact */ 378 context->echo_index = PCAN_USB_MAX_TX_URBS; 379 380 atomic_dec(&dev->active_tx_urbs); 381 382 switch (err) { 383 case -ENODEV: 384 netif_device_detach(netdev); 385 break; 386 default: 387 netdev_warn(netdev, "tx urb submitting failed err=%d\n", 388 err); 389 fallthrough; 390 case -ENOENT: 391 /* cable unplugged */ 392 stats->tx_dropped++; 393 } 394 } else { 395 netif_trans_update(netdev); 396 397 /* slow down tx path */ 398 if (atomic_read(&dev->active_tx_urbs) >= PCAN_USB_MAX_TX_URBS) 399 netif_stop_queue(netdev); 400 } 401 402 return NETDEV_TX_OK; 403 } 404 405 /* 406 * start the CAN interface. 407 * Rx and Tx urbs are allocated here. Rx urbs are submitted here. 408 */ 409 static int peak_usb_start(struct peak_usb_device *dev) 410 { 411 struct net_device *netdev = dev->netdev; 412 int err, i; 413 414 for (i = 0; i < PCAN_USB_MAX_RX_URBS; i++) { 415 struct urb *urb; 416 u8 *buf; 417 418 /* create a URB, and a buffer for it, to receive usb messages */ 419 urb = usb_alloc_urb(0, GFP_KERNEL); 420 if (!urb) { 421 err = -ENOMEM; 422 break; 423 } 424 425 buf = kmalloc(dev->adapter->rx_buffer_size, GFP_KERNEL); 426 if (!buf) { 427 usb_free_urb(urb); 428 err = -ENOMEM; 429 break; 430 } 431 432 usb_fill_bulk_urb(urb, dev->udev, 433 usb_rcvbulkpipe(dev->udev, dev->ep_msg_in), 434 buf, dev->adapter->rx_buffer_size, 435 peak_usb_read_bulk_callback, dev); 436 437 /* ask last usb_free_urb() to also kfree() transfer_buffer */ 438 urb->transfer_flags |= URB_FREE_BUFFER; 439 usb_anchor_urb(urb, &dev->rx_submitted); 440 441 err = usb_submit_urb(urb, GFP_KERNEL); 442 if (err) { 443 if (err == -ENODEV) 444 netif_device_detach(dev->netdev); 445 446 usb_unanchor_urb(urb); 447 kfree(buf); 448 usb_free_urb(urb); 449 break; 450 } 451 452 /* drop reference, USB core will take care of freeing it */ 453 usb_free_urb(urb); 454 } 455 456 /* did we submit any URBs? Warn if we was not able to submit all urbs */ 457 if (i < PCAN_USB_MAX_RX_URBS) { 458 if (i == 0) { 459 netdev_err(netdev, "couldn't setup any rx URB\n"); 460 return err; 461 } 462 463 netdev_warn(netdev, "rx performance may be slow\n"); 464 } 465 466 /* pre-alloc tx buffers and corresponding urbs */ 467 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) { 468 struct peak_tx_urb_context *context; 469 struct urb *urb; 470 u8 *buf; 471 472 /* create a URB and a buffer for it, to transmit usb messages */ 473 urb = usb_alloc_urb(0, GFP_KERNEL); 474 if (!urb) { 475 err = -ENOMEM; 476 break; 477 } 478 479 buf = kmalloc(dev->adapter->tx_buffer_size, GFP_KERNEL); 480 if (!buf) { 481 usb_free_urb(urb); 482 err = -ENOMEM; 483 break; 484 } 485 486 context = dev->tx_contexts + i; 487 context->dev = dev; 488 context->urb = urb; 489 490 usb_fill_bulk_urb(urb, dev->udev, 491 usb_sndbulkpipe(dev->udev, dev->ep_msg_out), 492 buf, dev->adapter->tx_buffer_size, 493 peak_usb_write_bulk_callback, context); 494 495 /* ask last usb_free_urb() to also kfree() transfer_buffer */ 496 urb->transfer_flags |= URB_FREE_BUFFER; 497 } 498 499 /* warn if we were not able to allocate enough tx contexts */ 500 if (i < PCAN_USB_MAX_TX_URBS) { 501 if (i == 0) { 502 netdev_err(netdev, "couldn't setup any tx URB\n"); 503 goto err_tx; 504 } 505 506 netdev_warn(netdev, "tx performance may be slow\n"); 507 } 508 509 if (dev->adapter->dev_start) { 510 err = dev->adapter->dev_start(dev); 511 if (err) 512 goto err_adapter; 513 } 514 515 dev->state |= PCAN_USB_STATE_STARTED; 516 517 /* can set bus on now */ 518 if (dev->adapter->dev_set_bus) { 519 err = dev->adapter->dev_set_bus(dev, 1); 520 if (err) 521 goto err_adapter; 522 } 523 524 dev->can.state = CAN_STATE_ERROR_ACTIVE; 525 526 return 0; 527 528 err_adapter: 529 if (err == -ENODEV) 530 netif_device_detach(dev->netdev); 531 532 netdev_warn(netdev, "couldn't submit control: %d\n", err); 533 534 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) { 535 usb_free_urb(dev->tx_contexts[i].urb); 536 dev->tx_contexts[i].urb = NULL; 537 } 538 err_tx: 539 usb_kill_anchored_urbs(&dev->rx_submitted); 540 541 return err; 542 } 543 544 /* 545 * called by netdev to open the corresponding CAN interface. 546 */ 547 static int peak_usb_ndo_open(struct net_device *netdev) 548 { 549 struct peak_usb_device *dev = netdev_priv(netdev); 550 int err; 551 552 /* common open */ 553 err = open_candev(netdev); 554 if (err) 555 return err; 556 557 /* finally start device */ 558 err = peak_usb_start(dev); 559 if (err) { 560 netdev_err(netdev, "couldn't start device: %d\n", err); 561 close_candev(netdev); 562 return err; 563 } 564 565 netif_start_queue(netdev); 566 567 return 0; 568 } 569 570 /* 571 * unlink in-flight Rx and Tx urbs and free their memory. 572 */ 573 static void peak_usb_unlink_all_urbs(struct peak_usb_device *dev) 574 { 575 int i; 576 577 /* free all Rx (submitted) urbs */ 578 usb_kill_anchored_urbs(&dev->rx_submitted); 579 580 /* free unsubmitted Tx urbs first */ 581 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) { 582 struct urb *urb = dev->tx_contexts[i].urb; 583 584 if (!urb || 585 dev->tx_contexts[i].echo_index != PCAN_USB_MAX_TX_URBS) { 586 /* 587 * this urb is already released or always submitted, 588 * let usb core free by itself 589 */ 590 continue; 591 } 592 593 usb_free_urb(urb); 594 dev->tx_contexts[i].urb = NULL; 595 } 596 597 /* then free all submitted Tx urbs */ 598 usb_kill_anchored_urbs(&dev->tx_submitted); 599 atomic_set(&dev->active_tx_urbs, 0); 600 } 601 602 /* 603 * called by netdev to close the corresponding CAN interface. 604 */ 605 static int peak_usb_ndo_stop(struct net_device *netdev) 606 { 607 struct peak_usb_device *dev = netdev_priv(netdev); 608 609 dev->state &= ~PCAN_USB_STATE_STARTED; 610 netif_stop_queue(netdev); 611 612 close_candev(netdev); 613 614 dev->can.state = CAN_STATE_STOPPED; 615 616 /* unlink all pending urbs and free used memory */ 617 peak_usb_unlink_all_urbs(dev); 618 619 if (dev->adapter->dev_stop) 620 dev->adapter->dev_stop(dev); 621 622 /* can set bus off now */ 623 if (dev->adapter->dev_set_bus) { 624 int err = dev->adapter->dev_set_bus(dev, 0); 625 if (err) 626 return err; 627 } 628 629 return 0; 630 } 631 632 /* 633 * handle end of waiting for the device to reset 634 */ 635 void peak_usb_restart_complete(struct peak_usb_device *dev) 636 { 637 /* finally MUST update can state */ 638 dev->can.state = CAN_STATE_ERROR_ACTIVE; 639 640 /* netdev queue can be awaken now */ 641 netif_wake_queue(dev->netdev); 642 } 643 644 void peak_usb_async_complete(struct urb *urb) 645 { 646 kfree(urb->transfer_buffer); 647 usb_free_urb(urb); 648 } 649 650 /* 651 * device (auto-)restart mechanism runs in a timer context => 652 * MUST handle restart with asynchronous usb transfers 653 */ 654 static int peak_usb_restart(struct peak_usb_device *dev) 655 { 656 struct urb *urb; 657 int err; 658 u8 *buf; 659 660 /* 661 * if device doesn't define any asynchronous restart handler, simply 662 * wake the netdev queue up 663 */ 664 if (!dev->adapter->dev_restart_async) { 665 peak_usb_restart_complete(dev); 666 return 0; 667 } 668 669 /* first allocate a urb to handle the asynchronous steps */ 670 urb = usb_alloc_urb(0, GFP_ATOMIC); 671 if (!urb) 672 return -ENOMEM; 673 674 /* also allocate enough space for the commands to send */ 675 buf = kmalloc(PCAN_USB_MAX_CMD_LEN, GFP_ATOMIC); 676 if (!buf) { 677 usb_free_urb(urb); 678 return -ENOMEM; 679 } 680 681 /* call the device specific handler for the restart */ 682 err = dev->adapter->dev_restart_async(dev, urb, buf); 683 if (!err) 684 return 0; 685 686 kfree(buf); 687 usb_free_urb(urb); 688 689 return err; 690 } 691 692 /* 693 * candev callback used to change CAN mode. 694 * Warning: this is called from a timer context! 695 */ 696 static int peak_usb_set_mode(struct net_device *netdev, enum can_mode mode) 697 { 698 struct peak_usb_device *dev = netdev_priv(netdev); 699 int err = 0; 700 701 switch (mode) { 702 case CAN_MODE_START: 703 err = peak_usb_restart(dev); 704 if (err) 705 netdev_err(netdev, "couldn't start device (err %d)\n", 706 err); 707 break; 708 709 default: 710 return -EOPNOTSUPP; 711 } 712 713 return err; 714 } 715 716 /* 717 * candev callback used to set device nominal/arbitration bitrate. 718 */ 719 static int peak_usb_set_bittiming(struct net_device *netdev) 720 { 721 struct peak_usb_device *dev = netdev_priv(netdev); 722 const struct peak_usb_adapter *pa = dev->adapter; 723 724 if (pa->dev_set_bittiming) { 725 struct can_bittiming *bt = &dev->can.bittiming; 726 int err = pa->dev_set_bittiming(dev, bt); 727 728 if (err) 729 netdev_info(netdev, "couldn't set bitrate (err %d)\n", 730 err); 731 return err; 732 } 733 734 return 0; 735 } 736 737 /* 738 * candev callback used to set device data bitrate. 739 */ 740 static int peak_usb_set_data_bittiming(struct net_device *netdev) 741 { 742 struct peak_usb_device *dev = netdev_priv(netdev); 743 const struct peak_usb_adapter *pa = dev->adapter; 744 745 if (pa->dev_set_data_bittiming) { 746 struct can_bittiming *bt = &dev->can.data_bittiming; 747 int err = pa->dev_set_data_bittiming(dev, bt); 748 749 if (err) 750 netdev_info(netdev, 751 "couldn't set data bitrate (err %d)\n", 752 err); 753 754 return err; 755 } 756 757 return 0; 758 } 759 760 static const struct net_device_ops peak_usb_netdev_ops = { 761 .ndo_open = peak_usb_ndo_open, 762 .ndo_stop = peak_usb_ndo_stop, 763 .ndo_start_xmit = peak_usb_ndo_start_xmit, 764 .ndo_change_mtu = can_change_mtu, 765 }; 766 767 /* 768 * create one device which is attached to CAN controller #ctrl_idx of the 769 * usb adapter. 770 */ 771 static int peak_usb_create_dev(const struct peak_usb_adapter *peak_usb_adapter, 772 struct usb_interface *intf, int ctrl_idx) 773 { 774 struct usb_device *usb_dev = interface_to_usbdev(intf); 775 int sizeof_candev = peak_usb_adapter->sizeof_dev_private; 776 struct peak_usb_device *dev; 777 struct net_device *netdev; 778 int i, err; 779 u16 tmp16; 780 781 if (sizeof_candev < sizeof(struct peak_usb_device)) 782 sizeof_candev = sizeof(struct peak_usb_device); 783 784 netdev = alloc_candev(sizeof_candev, PCAN_USB_MAX_TX_URBS); 785 if (!netdev) { 786 dev_err(&intf->dev, "%s: couldn't alloc candev\n", 787 PCAN_USB_DRIVER_NAME); 788 return -ENOMEM; 789 } 790 791 dev = netdev_priv(netdev); 792 793 /* allocate a buffer large enough to send commands */ 794 dev->cmd_buf = kzalloc(PCAN_USB_MAX_CMD_LEN, GFP_KERNEL); 795 if (!dev->cmd_buf) { 796 err = -ENOMEM; 797 goto lbl_free_candev; 798 } 799 800 dev->udev = usb_dev; 801 dev->netdev = netdev; 802 dev->adapter = peak_usb_adapter; 803 dev->ctrl_idx = ctrl_idx; 804 dev->state = PCAN_USB_STATE_CONNECTED; 805 806 dev->ep_msg_in = peak_usb_adapter->ep_msg_in; 807 dev->ep_msg_out = peak_usb_adapter->ep_msg_out[ctrl_idx]; 808 809 dev->can.clock = peak_usb_adapter->clock; 810 dev->can.bittiming_const = peak_usb_adapter->bittiming_const; 811 dev->can.do_set_bittiming = peak_usb_set_bittiming; 812 dev->can.data_bittiming_const = peak_usb_adapter->data_bittiming_const; 813 dev->can.do_set_data_bittiming = peak_usb_set_data_bittiming; 814 dev->can.do_set_mode = peak_usb_set_mode; 815 dev->can.do_get_berr_counter = peak_usb_adapter->do_get_berr_counter; 816 dev->can.ctrlmode_supported = peak_usb_adapter->ctrlmode_supported; 817 818 netdev->netdev_ops = &peak_usb_netdev_ops; 819 820 netdev->flags |= IFF_ECHO; /* we support local echo */ 821 822 init_usb_anchor(&dev->rx_submitted); 823 824 init_usb_anchor(&dev->tx_submitted); 825 atomic_set(&dev->active_tx_urbs, 0); 826 827 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) 828 dev->tx_contexts[i].echo_index = PCAN_USB_MAX_TX_URBS; 829 830 dev->prev_siblings = usb_get_intfdata(intf); 831 usb_set_intfdata(intf, dev); 832 833 SET_NETDEV_DEV(netdev, &intf->dev); 834 netdev->dev_id = ctrl_idx; 835 836 err = register_candev(netdev); 837 if (err) { 838 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err); 839 goto lbl_restore_intf_data; 840 } 841 842 if (dev->prev_siblings) 843 (dev->prev_siblings)->next_siblings = dev; 844 845 /* keep hw revision into the netdevice */ 846 tmp16 = le16_to_cpu(usb_dev->descriptor.bcdDevice); 847 dev->device_rev = tmp16 >> 8; 848 849 if (dev->adapter->dev_init) { 850 err = dev->adapter->dev_init(dev); 851 if (err) 852 goto lbl_unregister_candev; 853 } 854 855 /* set bus off */ 856 if (dev->adapter->dev_set_bus) { 857 err = dev->adapter->dev_set_bus(dev, 0); 858 if (err) 859 goto lbl_unregister_candev; 860 } 861 862 /* get device number early */ 863 if (dev->adapter->dev_get_device_id) 864 dev->adapter->dev_get_device_id(dev, &dev->device_number); 865 866 netdev_info(netdev, "attached to %s channel %u (device %u)\n", 867 peak_usb_adapter->name, ctrl_idx, dev->device_number); 868 869 return 0; 870 871 lbl_unregister_candev: 872 unregister_candev(netdev); 873 874 lbl_restore_intf_data: 875 usb_set_intfdata(intf, dev->prev_siblings); 876 kfree(dev->cmd_buf); 877 878 lbl_free_candev: 879 free_candev(netdev); 880 881 return err; 882 } 883 884 /* 885 * called by the usb core when the device is unplugged from the system 886 */ 887 static void peak_usb_disconnect(struct usb_interface *intf) 888 { 889 struct peak_usb_device *dev; 890 struct peak_usb_device *dev_prev_siblings; 891 892 /* unregister as many netdev devices as siblings */ 893 for (dev = usb_get_intfdata(intf); dev; dev = dev_prev_siblings) { 894 struct net_device *netdev = dev->netdev; 895 char name[IFNAMSIZ]; 896 897 dev_prev_siblings = dev->prev_siblings; 898 dev->state &= ~PCAN_USB_STATE_CONNECTED; 899 strlcpy(name, netdev->name, IFNAMSIZ); 900 901 unregister_netdev(netdev); 902 903 kfree(dev->cmd_buf); 904 dev->next_siblings = NULL; 905 if (dev->adapter->dev_free) 906 dev->adapter->dev_free(dev); 907 908 free_candev(netdev); 909 dev_info(&intf->dev, "%s removed\n", name); 910 } 911 912 usb_set_intfdata(intf, NULL); 913 } 914 915 /* 916 * probe function for new PEAK-System devices 917 */ 918 static int peak_usb_probe(struct usb_interface *intf, 919 const struct usb_device_id *id) 920 { 921 struct usb_device *usb_dev = interface_to_usbdev(intf); 922 const u16 usb_id_product = le16_to_cpu(usb_dev->descriptor.idProduct); 923 const struct peak_usb_adapter *peak_usb_adapter = NULL; 924 int i, err = -ENOMEM; 925 926 /* get corresponding PCAN-USB adapter */ 927 for (i = 0; i < ARRAY_SIZE(peak_usb_adapters_list); i++) 928 if (peak_usb_adapters_list[i]->device_id == usb_id_product) { 929 peak_usb_adapter = peak_usb_adapters_list[i]; 930 break; 931 } 932 933 if (!peak_usb_adapter) { 934 /* should never come except device_id bad usage in this file */ 935 pr_err("%s: didn't find device id. 0x%x in devices list\n", 936 PCAN_USB_DRIVER_NAME, usb_id_product); 937 return -ENODEV; 938 } 939 940 /* got corresponding adapter: check if it handles current interface */ 941 if (peak_usb_adapter->intf_probe) { 942 err = peak_usb_adapter->intf_probe(intf); 943 if (err) 944 return err; 945 } 946 947 for (i = 0; i < peak_usb_adapter->ctrl_count; i++) { 948 err = peak_usb_create_dev(peak_usb_adapter, intf, i); 949 if (err) { 950 /* deregister already created devices */ 951 peak_usb_disconnect(intf); 952 break; 953 } 954 } 955 956 return err; 957 } 958 959 /* usb specific object needed to register this driver with the usb subsystem */ 960 static struct usb_driver peak_usb_driver = { 961 .name = PCAN_USB_DRIVER_NAME, 962 .disconnect = peak_usb_disconnect, 963 .probe = peak_usb_probe, 964 .id_table = peak_usb_table, 965 }; 966 967 static int __init peak_usb_init(void) 968 { 969 int err; 970 971 /* register this driver with the USB subsystem */ 972 err = usb_register(&peak_usb_driver); 973 if (err) 974 pr_err("%s: usb_register failed (err %d)\n", 975 PCAN_USB_DRIVER_NAME, err); 976 977 return err; 978 } 979 980 static int peak_usb_do_device_exit(struct device *d, void *arg) 981 { 982 struct usb_interface *intf = to_usb_interface(d); 983 struct peak_usb_device *dev; 984 985 /* stop as many netdev devices as siblings */ 986 for (dev = usb_get_intfdata(intf); dev; dev = dev->prev_siblings) { 987 struct net_device *netdev = dev->netdev; 988 989 if (netif_device_present(netdev)) 990 if (dev->adapter->dev_exit) 991 dev->adapter->dev_exit(dev); 992 } 993 994 return 0; 995 } 996 997 static void __exit peak_usb_exit(void) 998 { 999 int err; 1000 1001 /* last chance do send any synchronous commands here */ 1002 err = driver_for_each_device(&peak_usb_driver.drvwrap.driver, NULL, 1003 NULL, peak_usb_do_device_exit); 1004 if (err) 1005 pr_err("%s: failed to stop all can devices (err %d)\n", 1006 PCAN_USB_DRIVER_NAME, err); 1007 1008 /* deregister this driver with the USB subsystem */ 1009 usb_deregister(&peak_usb_driver); 1010 1011 pr_info("%s: PCAN-USB interfaces driver unloaded\n", 1012 PCAN_USB_DRIVER_NAME); 1013 } 1014 1015 module_init(peak_usb_init); 1016 module_exit(peak_usb_exit); 1017