1/* 2 * CAN driver for esd CAN-USB/2 and CAN-USB/Micro 3 * 4 * Copyright (C) 2010-2012 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published 8 * by the Free Software Foundation; version 2 of the License. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License along 16 * with this program; if not, write to the Free Software Foundation, Inc., 17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 18 */ 19#include <linux/signal.h> 20#include <linux/slab.h> 21#include <linux/module.h> 22#include <linux/netdevice.h> 23#include <linux/usb.h> 24 25#include <linux/can.h> 26#include <linux/can/dev.h> 27#include <linux/can/error.h> 28 29MODULE_AUTHOR("Matthias Fuchs <matthias.fuchs@esd.eu>"); 30MODULE_DESCRIPTION("CAN driver for esd CAN-USB/2 and CAN-USB/Micro interfaces"); 31MODULE_LICENSE("GPL v2"); 32 33/* Define these values to match your devices */ 34#define USB_ESDGMBH_VENDOR_ID 0x0ab4 35#define USB_CANUSB2_PRODUCT_ID 0x0010 36#define USB_CANUSBM_PRODUCT_ID 0x0011 37 38#define ESD_USB2_CAN_CLOCK 60000000 39#define ESD_USBM_CAN_CLOCK 36000000 40#define ESD_USB2_MAX_NETS 2 41 42/* USB2 commands */ 43#define CMD_VERSION 1 /* also used for VERSION_REPLY */ 44#define CMD_CAN_RX 2 /* device to host only */ 45#define CMD_CAN_TX 3 /* also used for TX_DONE */ 46#define CMD_SETBAUD 4 /* also used for SETBAUD_REPLY */ 47#define CMD_TS 5 /* also used for TS_REPLY */ 48#define CMD_IDADD 6 /* also used for IDADD_REPLY */ 49 50/* esd CAN message flags - dlc field */ 51#define ESD_RTR 0x10 52 53/* esd CAN message flags - id field */ 54#define ESD_EXTID 0x20000000 55#define ESD_EVENT 0x40000000 56#define ESD_IDMASK 0x1fffffff 57 58/* esd CAN event ids used by this driver */ 59#define ESD_EV_CAN_ERROR_EXT 2 60 61/* baudrate message flags */ 62#define ESD_USB2_UBR 0x80000000 63#define ESD_USB2_LOM 0x40000000 64#define ESD_USB2_NO_BAUDRATE 0x7fffffff 65#define ESD_USB2_TSEG1_MIN 1 66#define ESD_USB2_TSEG1_MAX 16 67#define ESD_USB2_TSEG1_SHIFT 16 68#define ESD_USB2_TSEG2_MIN 1 69#define ESD_USB2_TSEG2_MAX 8 70#define ESD_USB2_TSEG2_SHIFT 20 71#define ESD_USB2_SJW_MAX 4 72#define ESD_USB2_SJW_SHIFT 14 73#define ESD_USBM_SJW_SHIFT 24 74#define ESD_USB2_BRP_MIN 1 75#define ESD_USB2_BRP_MAX 1024 76#define ESD_USB2_BRP_INC 1 77#define ESD_USB2_3_SAMPLES 0x00800000 78 79/* esd IDADD message */ 80#define ESD_ID_ENABLE 0x80 81#define ESD_MAX_ID_SEGMENT 64 82 83/* SJA1000 ECC register (emulated by usb2 firmware) */ 84#define SJA1000_ECC_SEG 0x1F 85#define SJA1000_ECC_DIR 0x20 86#define SJA1000_ECC_ERR 0x06 87#define SJA1000_ECC_BIT 0x00 88#define SJA1000_ECC_FORM 0x40 89#define SJA1000_ECC_STUFF 0x80 90#define SJA1000_ECC_MASK 0xc0 91 92/* esd bus state event codes */ 93#define ESD_BUSSTATE_MASK 0xc0 94#define ESD_BUSSTATE_WARN 0x40 95#define ESD_BUSSTATE_ERRPASSIVE 0x80 96#define ESD_BUSSTATE_BUSOFF 0xc0 97 98#define RX_BUFFER_SIZE 1024 99#define MAX_RX_URBS 4 100#define MAX_TX_URBS 16 /* must be power of 2 */ 101 102struct header_msg { 103 u8 len; /* len is always the total message length in 32bit words */ 104 u8 cmd; 105 u8 rsvd[2]; 106}; 107 108struct version_msg { 109 u8 len; 110 u8 cmd; 111 u8 rsvd; 112 u8 flags; 113 __le32 drv_version; 114}; 115 116struct version_reply_msg { 117 u8 len; 118 u8 cmd; 119 u8 nets; 120 u8 features; 121 __le32 version; 122 u8 name[16]; 123 __le32 rsvd; 124 __le32 ts; 125}; 126 127struct rx_msg { 128 u8 len; 129 u8 cmd; 130 u8 net; 131 u8 dlc; 132 __le32 ts; 133 __le32 id; /* upper 3 bits contain flags */ 134 u8 data[8]; 135}; 136 137struct tx_msg { 138 u8 len; 139 u8 cmd; 140 u8 net; 141 u8 dlc; 142 u32 hnd; /* opaque handle, not used by device */ 143 __le32 id; /* upper 3 bits contain flags */ 144 u8 data[8]; 145}; 146 147struct tx_done_msg { 148 u8 len; 149 u8 cmd; 150 u8 net; 151 u8 status; 152 u32 hnd; /* opaque handle, not used by device */ 153 __le32 ts; 154}; 155 156struct id_filter_msg { 157 u8 len; 158 u8 cmd; 159 u8 net; 160 u8 option; 161 __le32 mask[ESD_MAX_ID_SEGMENT + 1]; 162}; 163 164struct set_baudrate_msg { 165 u8 len; 166 u8 cmd; 167 u8 net; 168 u8 rsvd; 169 __le32 baud; 170}; 171 172/* Main message type used between library and application */ 173struct __attribute__ ((packed)) esd_usb2_msg { 174 union { 175 struct header_msg hdr; 176 struct version_msg version; 177 struct version_reply_msg version_reply; 178 struct rx_msg rx; 179 struct tx_msg tx; 180 struct tx_done_msg txdone; 181 struct set_baudrate_msg setbaud; 182 struct id_filter_msg filter; 183 } msg; 184}; 185 186static struct usb_device_id esd_usb2_table[] = { 187 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSB2_PRODUCT_ID)}, 188 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSBM_PRODUCT_ID)}, 189 {} 190}; 191MODULE_DEVICE_TABLE(usb, esd_usb2_table); 192 193struct esd_usb2_net_priv; 194 195struct esd_tx_urb_context { 196 struct esd_usb2_net_priv *priv; 197 u32 echo_index; 198 int dlc; 199}; 200 201struct esd_usb2 { 202 struct usb_device *udev; 203 struct esd_usb2_net_priv *nets[ESD_USB2_MAX_NETS]; 204 205 struct usb_anchor rx_submitted; 206 207 int net_count; 208 u32 version; 209 int rxinitdone; 210}; 211 212struct esd_usb2_net_priv { 213 struct can_priv can; /* must be the first member */ 214 215 atomic_t active_tx_jobs; 216 struct usb_anchor tx_submitted; 217 struct esd_tx_urb_context tx_contexts[MAX_TX_URBS]; 218 219 struct esd_usb2 *usb2; 220 struct net_device *netdev; 221 int index; 222 u8 old_state; 223 struct can_berr_counter bec; 224}; 225 226static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv, 227 struct esd_usb2_msg *msg) 228{ 229 struct net_device_stats *stats = &priv->netdev->stats; 230 struct can_frame *cf; 231 struct sk_buff *skb; 232 u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK; 233 234 if (id == ESD_EV_CAN_ERROR_EXT) { 235 u8 state = msg->msg.rx.data[0]; 236 u8 ecc = msg->msg.rx.data[1]; 237 u8 txerr = msg->msg.rx.data[2]; 238 u8 rxerr = msg->msg.rx.data[3]; 239 240 skb = alloc_can_err_skb(priv->netdev, &cf); 241 if (skb == NULL) { 242 stats->rx_dropped++; 243 return; 244 } 245 246 if (state != priv->old_state) { 247 priv->old_state = state; 248 249 switch (state & ESD_BUSSTATE_MASK) { 250 case ESD_BUSSTATE_BUSOFF: 251 priv->can.state = CAN_STATE_BUS_OFF; 252 cf->can_id |= CAN_ERR_BUSOFF; 253 priv->can.can_stats.bus_off++; 254 can_bus_off(priv->netdev); 255 break; 256 case ESD_BUSSTATE_WARN: 257 priv->can.state = CAN_STATE_ERROR_WARNING; 258 priv->can.can_stats.error_warning++; 259 break; 260 case ESD_BUSSTATE_ERRPASSIVE: 261 priv->can.state = CAN_STATE_ERROR_PASSIVE; 262 priv->can.can_stats.error_passive++; 263 break; 264 default: 265 priv->can.state = CAN_STATE_ERROR_ACTIVE; 266 break; 267 } 268 } else { 269 priv->can.can_stats.bus_error++; 270 stats->rx_errors++; 271 272 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 273 274 switch (ecc & SJA1000_ECC_MASK) { 275 case SJA1000_ECC_BIT: 276 cf->data[2] |= CAN_ERR_PROT_BIT; 277 break; 278 case SJA1000_ECC_FORM: 279 cf->data[2] |= CAN_ERR_PROT_FORM; 280 break; 281 case SJA1000_ECC_STUFF: 282 cf->data[2] |= CAN_ERR_PROT_STUFF; 283 break; 284 default: 285 cf->data[2] |= CAN_ERR_PROT_UNSPEC; 286 cf->data[3] = ecc & SJA1000_ECC_SEG; 287 break; 288 } 289 290 /* Error occurred during transmission? */ 291 if (!(ecc & SJA1000_ECC_DIR)) 292 cf->data[2] |= CAN_ERR_PROT_TX; 293 294 if (priv->can.state == CAN_STATE_ERROR_WARNING || 295 priv->can.state == CAN_STATE_ERROR_PASSIVE) { 296 cf->data[1] = (txerr > rxerr) ? 297 CAN_ERR_CRTL_TX_PASSIVE : 298 CAN_ERR_CRTL_RX_PASSIVE; 299 } 300 cf->data[6] = txerr; 301 cf->data[7] = rxerr; 302 } 303 304 netif_rx(skb); 305 306 priv->bec.txerr = txerr; 307 priv->bec.rxerr = rxerr; 308 309 stats->rx_packets++; 310 stats->rx_bytes += cf->can_dlc; 311 } 312} 313 314static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv, 315 struct esd_usb2_msg *msg) 316{ 317 struct net_device_stats *stats = &priv->netdev->stats; 318 struct can_frame *cf; 319 struct sk_buff *skb; 320 int i; 321 u32 id; 322 323 if (!netif_device_present(priv->netdev)) 324 return; 325 326 id = le32_to_cpu(msg->msg.rx.id); 327 328 if (id & ESD_EVENT) { 329 esd_usb2_rx_event(priv, msg); 330 } else { 331 skb = alloc_can_skb(priv->netdev, &cf); 332 if (skb == NULL) { 333 stats->rx_dropped++; 334 return; 335 } 336 337 cf->can_id = id & ESD_IDMASK; 338 cf->can_dlc = get_can_dlc(msg->msg.rx.dlc); 339 340 if (id & ESD_EXTID) 341 cf->can_id |= CAN_EFF_FLAG; 342 343 if (msg->msg.rx.dlc & ESD_RTR) { 344 cf->can_id |= CAN_RTR_FLAG; 345 } else { 346 for (i = 0; i < cf->can_dlc; i++) 347 cf->data[i] = msg->msg.rx.data[i]; 348 } 349 350 netif_rx(skb); 351 352 stats->rx_packets++; 353 stats->rx_bytes += cf->can_dlc; 354 } 355 356 return; 357} 358 359static void esd_usb2_tx_done_msg(struct esd_usb2_net_priv *priv, 360 struct esd_usb2_msg *msg) 361{ 362 struct net_device_stats *stats = &priv->netdev->stats; 363 struct net_device *netdev = priv->netdev; 364 struct esd_tx_urb_context *context; 365 366 if (!netif_device_present(netdev)) 367 return; 368 369 context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)]; 370 371 if (!msg->msg.txdone.status) { 372 stats->tx_packets++; 373 stats->tx_bytes += context->dlc; 374 can_get_echo_skb(netdev, context->echo_index); 375 } else { 376 stats->tx_errors++; 377 can_free_echo_skb(netdev, context->echo_index); 378 } 379 380 /* Release context */ 381 context->echo_index = MAX_TX_URBS; 382 atomic_dec(&priv->active_tx_jobs); 383 384 netif_wake_queue(netdev); 385} 386 387static void esd_usb2_read_bulk_callback(struct urb *urb) 388{ 389 struct esd_usb2 *dev = urb->context; 390 int retval; 391 int pos = 0; 392 int i; 393 394 switch (urb->status) { 395 case 0: /* success */ 396 break; 397 398 case -ENOENT: 399 case -ESHUTDOWN: 400 return; 401 402 default: 403 dev_info(dev->udev->dev.parent, 404 "Rx URB aborted (%d)\n", urb->status); 405 goto resubmit_urb; 406 } 407 408 while (pos < urb->actual_length) { 409 struct esd_usb2_msg *msg; 410 411 msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos); 412 413 switch (msg->msg.hdr.cmd) { 414 case CMD_CAN_RX: 415 if (msg->msg.rx.net >= dev->net_count) { 416 dev_err(dev->udev->dev.parent, "format error\n"); 417 break; 418 } 419 420 esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg); 421 break; 422 423 case CMD_CAN_TX: 424 if (msg->msg.txdone.net >= dev->net_count) { 425 dev_err(dev->udev->dev.parent, "format error\n"); 426 break; 427 } 428 429 esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net], 430 msg); 431 break; 432 } 433 434 pos += msg->msg.hdr.len << 2; 435 436 if (pos > urb->actual_length) { 437 dev_err(dev->udev->dev.parent, "format error\n"); 438 break; 439 } 440 } 441 442resubmit_urb: 443 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1), 444 urb->transfer_buffer, RX_BUFFER_SIZE, 445 esd_usb2_read_bulk_callback, dev); 446 447 retval = usb_submit_urb(urb, GFP_ATOMIC); 448 if (retval == -ENODEV) { 449 for (i = 0; i < dev->net_count; i++) { 450 if (dev->nets[i]) 451 netif_device_detach(dev->nets[i]->netdev); 452 } 453 } else if (retval) { 454 dev_err(dev->udev->dev.parent, 455 "failed resubmitting read bulk urb: %d\n", retval); 456 } 457 458 return; 459} 460 461/* 462 * callback for bulk IN urb 463 */ 464static void esd_usb2_write_bulk_callback(struct urb *urb) 465{ 466 struct esd_tx_urb_context *context = urb->context; 467 struct esd_usb2_net_priv *priv; 468 struct net_device *netdev; 469 size_t size = sizeof(struct esd_usb2_msg); 470 471 WARN_ON(!context); 472 473 priv = context->priv; 474 netdev = priv->netdev; 475 476 /* free up our allocated buffer */ 477 usb_free_coherent(urb->dev, size, 478 urb->transfer_buffer, urb->transfer_dma); 479 480 if (!netif_device_present(netdev)) 481 return; 482 483 if (urb->status) 484 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status); 485 486 netdev->trans_start = jiffies; 487} 488 489static ssize_t show_firmware(struct device *d, 490 struct device_attribute *attr, char *buf) 491{ 492 struct usb_interface *intf = to_usb_interface(d); 493 struct esd_usb2 *dev = usb_get_intfdata(intf); 494 495 return sprintf(buf, "%d.%d.%d\n", 496 (dev->version >> 12) & 0xf, 497 (dev->version >> 8) & 0xf, 498 dev->version & 0xff); 499} 500static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL); 501 502static ssize_t show_hardware(struct device *d, 503 struct device_attribute *attr, char *buf) 504{ 505 struct usb_interface *intf = to_usb_interface(d); 506 struct esd_usb2 *dev = usb_get_intfdata(intf); 507 508 return sprintf(buf, "%d.%d.%d\n", 509 (dev->version >> 28) & 0xf, 510 (dev->version >> 24) & 0xf, 511 (dev->version >> 16) & 0xff); 512} 513static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL); 514 515static ssize_t show_nets(struct device *d, 516 struct device_attribute *attr, char *buf) 517{ 518 struct usb_interface *intf = to_usb_interface(d); 519 struct esd_usb2 *dev = usb_get_intfdata(intf); 520 521 return sprintf(buf, "%d", dev->net_count); 522} 523static DEVICE_ATTR(nets, S_IRUGO, show_nets, NULL); 524 525static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg) 526{ 527 int actual_length; 528 529 return usb_bulk_msg(dev->udev, 530 usb_sndbulkpipe(dev->udev, 2), 531 msg, 532 msg->msg.hdr.len << 2, 533 &actual_length, 534 1000); 535} 536 537static int esd_usb2_wait_msg(struct esd_usb2 *dev, 538 struct esd_usb2_msg *msg) 539{ 540 int actual_length; 541 542 return usb_bulk_msg(dev->udev, 543 usb_rcvbulkpipe(dev->udev, 1), 544 msg, 545 sizeof(*msg), 546 &actual_length, 547 1000); 548} 549 550static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev) 551{ 552 int i, err = 0; 553 554 if (dev->rxinitdone) 555 return 0; 556 557 for (i = 0; i < MAX_RX_URBS; i++) { 558 struct urb *urb = NULL; 559 u8 *buf = NULL; 560 561 /* create a URB, and a buffer for it */ 562 urb = usb_alloc_urb(0, GFP_KERNEL); 563 if (!urb) { 564 dev_warn(dev->udev->dev.parent, 565 "No memory left for URBs\n"); 566 err = -ENOMEM; 567 break; 568 } 569 570 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, 571 &urb->transfer_dma); 572 if (!buf) { 573 dev_warn(dev->udev->dev.parent, 574 "No memory left for USB buffer\n"); 575 err = -ENOMEM; 576 goto freeurb; 577 } 578 579 usb_fill_bulk_urb(urb, dev->udev, 580 usb_rcvbulkpipe(dev->udev, 1), 581 buf, RX_BUFFER_SIZE, 582 esd_usb2_read_bulk_callback, dev); 583 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 584 usb_anchor_urb(urb, &dev->rx_submitted); 585 586 err = usb_submit_urb(urb, GFP_KERNEL); 587 if (err) { 588 usb_unanchor_urb(urb); 589 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, 590 urb->transfer_dma); 591 } 592 593freeurb: 594 /* Drop reference, USB core will take care of freeing it */ 595 usb_free_urb(urb); 596 if (err) 597 break; 598 } 599 600 /* Did we submit any URBs */ 601 if (i == 0) { 602 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n"); 603 return err; 604 } 605 606 /* Warn if we've couldn't transmit all the URBs */ 607 if (i < MAX_RX_URBS) { 608 dev_warn(dev->udev->dev.parent, 609 "rx performance may be slow\n"); 610 } 611 612 dev->rxinitdone = 1; 613 return 0; 614} 615 616/* 617 * Start interface 618 */ 619static int esd_usb2_start(struct esd_usb2_net_priv *priv) 620{ 621 struct esd_usb2 *dev = priv->usb2; 622 struct net_device *netdev = priv->netdev; 623 struct esd_usb2_msg *msg; 624 int err, i; 625 626 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 627 if (!msg) { 628 err = -ENOMEM; 629 goto out; 630 } 631 632 /* 633 * Enable all IDs 634 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits). 635 * Each bit represents one 11 bit CAN identifier. A set bit 636 * enables reception of the corresponding CAN identifier. A cleared 637 * bit disabled this identifier. An additional bitmask value 638 * following the CAN 2.0A bits is used to enable reception of 639 * extended CAN frames. Only the LSB of this final mask is checked 640 * for the complete 29 bit ID range. The IDADD message also allows 641 * filter configuration for an ID subset. In this case you can add 642 * the number of the starting bitmask (0..64) to the filter.option 643 * field followed by only some bitmasks. 644 */ 645 msg->msg.hdr.cmd = CMD_IDADD; 646 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 647 msg->msg.filter.net = priv->index; 648 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 649 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++) 650 msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff); 651 /* enable 29bit extended IDs */ 652 msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001); 653 654 err = esd_usb2_send_msg(dev, msg); 655 if (err) 656 goto out; 657 658 err = esd_usb2_setup_rx_urbs(dev); 659 if (err) 660 goto out; 661 662 priv->can.state = CAN_STATE_ERROR_ACTIVE; 663 664out: 665 if (err == -ENODEV) 666 netif_device_detach(netdev); 667 if (err) 668 netdev_err(netdev, "couldn't start device: %d\n", err); 669 670 kfree(msg); 671 return err; 672} 673 674static void unlink_all_urbs(struct esd_usb2 *dev) 675{ 676 struct esd_usb2_net_priv *priv; 677 int i, j; 678 679 usb_kill_anchored_urbs(&dev->rx_submitted); 680 for (i = 0; i < dev->net_count; i++) { 681 priv = dev->nets[i]; 682 if (priv) { 683 usb_kill_anchored_urbs(&priv->tx_submitted); 684 atomic_set(&priv->active_tx_jobs, 0); 685 686 for (j = 0; j < MAX_TX_URBS; j++) 687 priv->tx_contexts[j].echo_index = MAX_TX_URBS; 688 } 689 } 690} 691 692static int esd_usb2_open(struct net_device *netdev) 693{ 694 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 695 int err; 696 697 /* common open */ 698 err = open_candev(netdev); 699 if (err) 700 return err; 701 702 /* finally start device */ 703 err = esd_usb2_start(priv); 704 if (err) { 705 netdev_warn(netdev, "couldn't start device: %d\n", err); 706 close_candev(netdev); 707 return err; 708 } 709 710 netif_start_queue(netdev); 711 712 return 0; 713} 714 715static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb, 716 struct net_device *netdev) 717{ 718 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 719 struct esd_usb2 *dev = priv->usb2; 720 struct esd_tx_urb_context *context = NULL; 721 struct net_device_stats *stats = &netdev->stats; 722 struct can_frame *cf = (struct can_frame *)skb->data; 723 struct esd_usb2_msg *msg; 724 struct urb *urb; 725 u8 *buf; 726 int i, err; 727 int ret = NETDEV_TX_OK; 728 size_t size = sizeof(struct esd_usb2_msg); 729 730 if (can_dropped_invalid_skb(netdev, skb)) 731 return NETDEV_TX_OK; 732 733 /* create a URB, and a buffer for it, and copy the data to the URB */ 734 urb = usb_alloc_urb(0, GFP_ATOMIC); 735 if (!urb) { 736 netdev_err(netdev, "No memory left for URBs\n"); 737 stats->tx_dropped++; 738 dev_kfree_skb(skb); 739 goto nourbmem; 740 } 741 742 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, 743 &urb->transfer_dma); 744 if (!buf) { 745 netdev_err(netdev, "No memory left for USB buffer\n"); 746 stats->tx_dropped++; 747 dev_kfree_skb(skb); 748 goto nobufmem; 749 } 750 751 msg = (struct esd_usb2_msg *)buf; 752 753 msg->msg.hdr.len = 3; /* minimal length */ 754 msg->msg.hdr.cmd = CMD_CAN_TX; 755 msg->msg.tx.net = priv->index; 756 msg->msg.tx.dlc = cf->can_dlc; 757 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); 758 759 if (cf->can_id & CAN_RTR_FLAG) 760 msg->msg.tx.dlc |= ESD_RTR; 761 762 if (cf->can_id & CAN_EFF_FLAG) 763 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID); 764 765 for (i = 0; i < cf->can_dlc; i++) 766 msg->msg.tx.data[i] = cf->data[i]; 767 768 msg->msg.hdr.len += (cf->can_dlc + 3) >> 2; 769 770 for (i = 0; i < MAX_TX_URBS; i++) { 771 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { 772 context = &priv->tx_contexts[i]; 773 break; 774 } 775 } 776 777 /* 778 * This may never happen. 779 */ 780 if (!context) { 781 netdev_warn(netdev, "couldn't find free context\n"); 782 ret = NETDEV_TX_BUSY; 783 goto releasebuf; 784 } 785 786 context->priv = priv; 787 context->echo_index = i; 788 context->dlc = cf->can_dlc; 789 790 /* hnd must not be 0 - MSB is stripped in txdone handling */ 791 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */ 792 793 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, 794 msg->msg.hdr.len << 2, 795 esd_usb2_write_bulk_callback, context); 796 797 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 798 799 usb_anchor_urb(urb, &priv->tx_submitted); 800 801 can_put_echo_skb(skb, netdev, context->echo_index); 802 803 atomic_inc(&priv->active_tx_jobs); 804 805 /* Slow down tx path */ 806 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS) 807 netif_stop_queue(netdev); 808 809 err = usb_submit_urb(urb, GFP_ATOMIC); 810 if (err) { 811 can_free_echo_skb(netdev, context->echo_index); 812 813 atomic_dec(&priv->active_tx_jobs); 814 usb_unanchor_urb(urb); 815 816 stats->tx_dropped++; 817 818 if (err == -ENODEV) 819 netif_device_detach(netdev); 820 else 821 netdev_warn(netdev, "failed tx_urb %d\n", err); 822 823 goto releasebuf; 824 } 825 826 netdev->trans_start = jiffies; 827 828 /* 829 * Release our reference to this URB, the USB core will eventually free 830 * it entirely. 831 */ 832 usb_free_urb(urb); 833 834 return NETDEV_TX_OK; 835 836releasebuf: 837 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); 838 839nobufmem: 840 usb_free_urb(urb); 841 842nourbmem: 843 return ret; 844} 845 846static int esd_usb2_close(struct net_device *netdev) 847{ 848 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 849 struct esd_usb2_msg *msg; 850 int i; 851 852 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 853 if (!msg) 854 return -ENOMEM; 855 856 /* Disable all IDs (see esd_usb2_start()) */ 857 msg->msg.hdr.cmd = CMD_IDADD; 858 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 859 msg->msg.filter.net = priv->index; 860 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 861 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++) 862 msg->msg.filter.mask[i] = 0; 863 if (esd_usb2_send_msg(priv->usb2, msg) < 0) 864 netdev_err(netdev, "sending idadd message failed\n"); 865 866 /* set CAN controller to reset mode */ 867 msg->msg.hdr.len = 2; 868 msg->msg.hdr.cmd = CMD_SETBAUD; 869 msg->msg.setbaud.net = priv->index; 870 msg->msg.setbaud.rsvd = 0; 871 msg->msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE); 872 if (esd_usb2_send_msg(priv->usb2, msg) < 0) 873 netdev_err(netdev, "sending setbaud message failed\n"); 874 875 priv->can.state = CAN_STATE_STOPPED; 876 877 netif_stop_queue(netdev); 878 879 close_candev(netdev); 880 881 kfree(msg); 882 883 return 0; 884} 885 886static const struct net_device_ops esd_usb2_netdev_ops = { 887 .ndo_open = esd_usb2_open, 888 .ndo_stop = esd_usb2_close, 889 .ndo_start_xmit = esd_usb2_start_xmit, 890 .ndo_change_mtu = can_change_mtu, 891}; 892 893static const struct can_bittiming_const esd_usb2_bittiming_const = { 894 .name = "esd_usb2", 895 .tseg1_min = ESD_USB2_TSEG1_MIN, 896 .tseg1_max = ESD_USB2_TSEG1_MAX, 897 .tseg2_min = ESD_USB2_TSEG2_MIN, 898 .tseg2_max = ESD_USB2_TSEG2_MAX, 899 .sjw_max = ESD_USB2_SJW_MAX, 900 .brp_min = ESD_USB2_BRP_MIN, 901 .brp_max = ESD_USB2_BRP_MAX, 902 .brp_inc = ESD_USB2_BRP_INC, 903}; 904 905static int esd_usb2_set_bittiming(struct net_device *netdev) 906{ 907 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 908 struct can_bittiming *bt = &priv->can.bittiming; 909 struct esd_usb2_msg *msg; 910 int err; 911 u32 canbtr; 912 int sjw_shift; 913 914 canbtr = ESD_USB2_UBR; 915 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) 916 canbtr |= ESD_USB2_LOM; 917 918 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1); 919 920 if (le16_to_cpu(priv->usb2->udev->descriptor.idProduct) == 921 USB_CANUSBM_PRODUCT_ID) 922 sjw_shift = ESD_USBM_SJW_SHIFT; 923 else 924 sjw_shift = ESD_USB2_SJW_SHIFT; 925 926 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1)) 927 << sjw_shift; 928 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1) 929 & (ESD_USB2_TSEG1_MAX - 1)) 930 << ESD_USB2_TSEG1_SHIFT; 931 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1)) 932 << ESD_USB2_TSEG2_SHIFT; 933 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 934 canbtr |= ESD_USB2_3_SAMPLES; 935 936 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 937 if (!msg) 938 return -ENOMEM; 939 940 msg->msg.hdr.len = 2; 941 msg->msg.hdr.cmd = CMD_SETBAUD; 942 msg->msg.setbaud.net = priv->index; 943 msg->msg.setbaud.rsvd = 0; 944 msg->msg.setbaud.baud = cpu_to_le32(canbtr); 945 946 netdev_info(netdev, "setting BTR=%#x\n", canbtr); 947 948 err = esd_usb2_send_msg(priv->usb2, msg); 949 950 kfree(msg); 951 return err; 952} 953 954static int esd_usb2_get_berr_counter(const struct net_device *netdev, 955 struct can_berr_counter *bec) 956{ 957 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 958 959 bec->txerr = priv->bec.txerr; 960 bec->rxerr = priv->bec.rxerr; 961 962 return 0; 963} 964 965static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode) 966{ 967 switch (mode) { 968 case CAN_MODE_START: 969 netif_wake_queue(netdev); 970 break; 971 972 default: 973 return -EOPNOTSUPP; 974 } 975 976 return 0; 977} 978 979static int esd_usb2_probe_one_net(struct usb_interface *intf, int index) 980{ 981 struct esd_usb2 *dev = usb_get_intfdata(intf); 982 struct net_device *netdev; 983 struct esd_usb2_net_priv *priv; 984 int err = 0; 985 int i; 986 987 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS); 988 if (!netdev) { 989 dev_err(&intf->dev, "couldn't alloc candev\n"); 990 err = -ENOMEM; 991 goto done; 992 } 993 994 priv = netdev_priv(netdev); 995 996 init_usb_anchor(&priv->tx_submitted); 997 atomic_set(&priv->active_tx_jobs, 0); 998 999 for (i = 0; i < MAX_TX_URBS; i++) 1000 priv->tx_contexts[i].echo_index = MAX_TX_URBS; 1001 1002 priv->usb2 = dev; 1003 priv->netdev = netdev; 1004 priv->index = index; 1005 1006 priv->can.state = CAN_STATE_STOPPED; 1007 priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY; 1008 1009 if (le16_to_cpu(dev->udev->descriptor.idProduct) == 1010 USB_CANUSBM_PRODUCT_ID) 1011 priv->can.clock.freq = ESD_USBM_CAN_CLOCK; 1012 else { 1013 priv->can.clock.freq = ESD_USB2_CAN_CLOCK; 1014 priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES; 1015 } 1016 1017 priv->can.bittiming_const = &esd_usb2_bittiming_const; 1018 priv->can.do_set_bittiming = esd_usb2_set_bittiming; 1019 priv->can.do_set_mode = esd_usb2_set_mode; 1020 priv->can.do_get_berr_counter = esd_usb2_get_berr_counter; 1021 1022 netdev->flags |= IFF_ECHO; /* we support local echo */ 1023 1024 netdev->netdev_ops = &esd_usb2_netdev_ops; 1025 1026 SET_NETDEV_DEV(netdev, &intf->dev); 1027 netdev->dev_id = index; 1028 1029 err = register_candev(netdev); 1030 if (err) { 1031 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err); 1032 free_candev(netdev); 1033 err = -ENOMEM; 1034 goto done; 1035 } 1036 1037 dev->nets[index] = priv; 1038 netdev_info(netdev, "device %s registered\n", netdev->name); 1039 1040done: 1041 return err; 1042} 1043 1044/* 1045 * probe function for new USB2 devices 1046 * 1047 * check version information and number of available 1048 * CAN interfaces 1049 */ 1050static int esd_usb2_probe(struct usb_interface *intf, 1051 const struct usb_device_id *id) 1052{ 1053 struct esd_usb2 *dev; 1054 struct esd_usb2_msg *msg; 1055 int i, err; 1056 1057 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 1058 if (!dev) { 1059 err = -ENOMEM; 1060 goto done; 1061 } 1062 1063 dev->udev = interface_to_usbdev(intf); 1064 1065 init_usb_anchor(&dev->rx_submitted); 1066 1067 usb_set_intfdata(intf, dev); 1068 1069 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 1070 if (!msg) { 1071 err = -ENOMEM; 1072 goto free_msg; 1073 } 1074 1075 /* query number of CAN interfaces (nets) */ 1076 msg->msg.hdr.cmd = CMD_VERSION; 1077 msg->msg.hdr.len = 2; 1078 msg->msg.version.rsvd = 0; 1079 msg->msg.version.flags = 0; 1080 msg->msg.version.drv_version = 0; 1081 1082 err = esd_usb2_send_msg(dev, msg); 1083 if (err < 0) { 1084 dev_err(&intf->dev, "sending version message failed\n"); 1085 goto free_msg; 1086 } 1087 1088 err = esd_usb2_wait_msg(dev, msg); 1089 if (err < 0) { 1090 dev_err(&intf->dev, "no version message answer\n"); 1091 goto free_msg; 1092 } 1093 1094 dev->net_count = (int)msg->msg.version_reply.nets; 1095 dev->version = le32_to_cpu(msg->msg.version_reply.version); 1096 1097 if (device_create_file(&intf->dev, &dev_attr_firmware)) 1098 dev_err(&intf->dev, 1099 "Couldn't create device file for firmware\n"); 1100 1101 if (device_create_file(&intf->dev, &dev_attr_hardware)) 1102 dev_err(&intf->dev, 1103 "Couldn't create device file for hardware\n"); 1104 1105 if (device_create_file(&intf->dev, &dev_attr_nets)) 1106 dev_err(&intf->dev, 1107 "Couldn't create device file for nets\n"); 1108 1109 /* do per device probing */ 1110 for (i = 0; i < dev->net_count; i++) 1111 esd_usb2_probe_one_net(intf, i); 1112 1113free_msg: 1114 kfree(msg); 1115 if (err) 1116 kfree(dev); 1117done: 1118 return err; 1119} 1120 1121/* 1122 * called by the usb core when the device is removed from the system 1123 */ 1124static void esd_usb2_disconnect(struct usb_interface *intf) 1125{ 1126 struct esd_usb2 *dev = usb_get_intfdata(intf); 1127 struct net_device *netdev; 1128 int i; 1129 1130 device_remove_file(&intf->dev, &dev_attr_firmware); 1131 device_remove_file(&intf->dev, &dev_attr_hardware); 1132 device_remove_file(&intf->dev, &dev_attr_nets); 1133 1134 usb_set_intfdata(intf, NULL); 1135 1136 if (dev) { 1137 for (i = 0; i < dev->net_count; i++) { 1138 if (dev->nets[i]) { 1139 netdev = dev->nets[i]->netdev; 1140 unregister_netdev(netdev); 1141 free_candev(netdev); 1142 } 1143 } 1144 unlink_all_urbs(dev); 1145 kfree(dev); 1146 } 1147} 1148 1149/* usb specific object needed to register this driver with the usb subsystem */ 1150static struct usb_driver esd_usb2_driver = { 1151 .name = "esd_usb2", 1152 .probe = esd_usb2_probe, 1153 .disconnect = esd_usb2_disconnect, 1154 .id_table = esd_usb2_table, 1155}; 1156 1157module_usb_driver(esd_usb2_driver); 1158