esd_usb2.c revision aabdfd6adb804d0aaba0188ade0f1afe42a52e31
1/* 2 * CAN driver for esd CAN-USB/2 3 * 4 * Copyright (C) 2010 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/init.h> 20#include <linux/signal.h> 21#include <linux/slab.h> 22#include <linux/module.h> 23#include <linux/netdevice.h> 24#include <linux/usb.h> 25 26#include <linux/can.h> 27#include <linux/can/dev.h> 28#include <linux/can/error.h> 29 30MODULE_AUTHOR("Matthias Fuchs <matthias.fuchs@esd.eu>"); 31MODULE_DESCRIPTION("CAN driver for esd CAN-USB/2 interfaces"); 32MODULE_LICENSE("GPL v2"); 33 34/* Define these values to match your devices */ 35#define USB_ESDGMBH_VENDOR_ID 0x0ab4 36#define USB_CANUSB2_PRODUCT_ID 0x0010 37 38#define ESD_USB2_CAN_CLOCK 60000000 39#define ESD_USB2_MAX_NETS 2 40 41/* USB2 commands */ 42#define CMD_VERSION 1 /* also used for VERSION_REPLY */ 43#define CMD_CAN_RX 2 /* device to host only */ 44#define CMD_CAN_TX 3 /* also used for TX_DONE */ 45#define CMD_SETBAUD 4 /* also used for SETBAUD_REPLY */ 46#define CMD_TS 5 /* also used for TS_REPLY */ 47#define CMD_IDADD 6 /* also used for IDADD_REPLY */ 48 49/* esd CAN message flags - dlc field */ 50#define ESD_RTR 0x10 51 52/* esd CAN message flags - id field */ 53#define ESD_EXTID 0x20000000 54#define ESD_EVENT 0x40000000 55#define ESD_IDMASK 0x1fffffff 56 57/* esd CAN event ids used by this driver */ 58#define ESD_EV_CAN_ERROR_EXT 2 59 60/* baudrate message flags */ 61#define ESD_USB2_UBR 0x80000000 62#define ESD_USB2_LOM 0x40000000 63#define ESD_USB2_NO_BAUDRATE 0x7fffffff 64#define ESD_USB2_TSEG1_MIN 1 65#define ESD_USB2_TSEG1_MAX 16 66#define ESD_USB2_TSEG1_SHIFT 16 67#define ESD_USB2_TSEG2_MIN 1 68#define ESD_USB2_TSEG2_MAX 8 69#define ESD_USB2_TSEG2_SHIFT 20 70#define ESD_USB2_SJW_MAX 4 71#define ESD_USB2_SJW_SHIFT 14 72#define ESD_USB2_BRP_MIN 1 73#define ESD_USB2_BRP_MAX 1024 74#define ESD_USB2_BRP_INC 1 75#define ESD_USB2_3_SAMPLES 0x00800000 76 77/* esd IDADD message */ 78#define ESD_ID_ENABLE 0x80 79#define ESD_MAX_ID_SEGMENT 64 80 81/* SJA1000 ECC register (emulated by usb2 firmware) */ 82#define SJA1000_ECC_SEG 0x1F 83#define SJA1000_ECC_DIR 0x20 84#define SJA1000_ECC_ERR 0x06 85#define SJA1000_ECC_BIT 0x00 86#define SJA1000_ECC_FORM 0x40 87#define SJA1000_ECC_STUFF 0x80 88#define SJA1000_ECC_MASK 0xc0 89 90/* esd bus state event codes */ 91#define ESD_BUSSTATE_MASK 0xc0 92#define ESD_BUSSTATE_WARN 0x40 93#define ESD_BUSSTATE_ERRPASSIVE 0x80 94#define ESD_BUSSTATE_BUSOFF 0xc0 95 96#define RX_BUFFER_SIZE 1024 97#define MAX_RX_URBS 4 98#define MAX_TX_URBS 16 /* must be power of 2 */ 99 100struct header_msg { 101 u8 len; /* len is always the total message length in 32bit words */ 102 u8 cmd; 103 u8 rsvd[2]; 104}; 105 106struct version_msg { 107 u8 len; 108 u8 cmd; 109 u8 rsvd; 110 u8 flags; 111 __le32 drv_version; 112}; 113 114struct version_reply_msg { 115 u8 len; 116 u8 cmd; 117 u8 nets; 118 u8 features; 119 __le32 version; 120 u8 name[16]; 121 __le32 rsvd; 122 __le32 ts; 123}; 124 125struct rx_msg { 126 u8 len; 127 u8 cmd; 128 u8 net; 129 u8 dlc; 130 __le32 ts; 131 __le32 id; /* upper 3 bits contain flags */ 132 u8 data[8]; 133}; 134 135struct tx_msg { 136 u8 len; 137 u8 cmd; 138 u8 net; 139 u8 dlc; 140 __le32 hnd; 141 __le32 id; /* upper 3 bits contain flags */ 142 u8 data[8]; 143}; 144 145struct tx_done_msg { 146 u8 len; 147 u8 cmd; 148 u8 net; 149 u8 status; 150 __le32 hnd; 151 __le32 ts; 152}; 153 154struct id_filter_msg { 155 u8 len; 156 u8 cmd; 157 u8 net; 158 u8 option; 159 __le32 mask[ESD_MAX_ID_SEGMENT + 1]; 160}; 161 162struct set_baudrate_msg { 163 u8 len; 164 u8 cmd; 165 u8 net; 166 u8 rsvd; 167 __le32 baud; 168}; 169 170/* Main message type used between library and application */ 171struct __attribute__ ((packed)) esd_usb2_msg { 172 union { 173 struct header_msg hdr; 174 struct version_msg version; 175 struct version_reply_msg version_reply; 176 struct rx_msg rx; 177 struct tx_msg tx; 178 struct tx_done_msg txdone; 179 struct set_baudrate_msg setbaud; 180 struct id_filter_msg filter; 181 } msg; 182}; 183 184static struct usb_device_id esd_usb2_table[] = { 185 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSB2_PRODUCT_ID)}, 186 {} 187}; 188MODULE_DEVICE_TABLE(usb, esd_usb2_table); 189 190struct esd_usb2_net_priv; 191 192struct esd_tx_urb_context { 193 struct esd_usb2_net_priv *priv; 194 u32 echo_index; 195 int dlc; 196}; 197 198struct esd_usb2 { 199 struct usb_device *udev; 200 struct esd_usb2_net_priv *nets[ESD_USB2_MAX_NETS]; 201 202 struct usb_anchor rx_submitted; 203 204 int net_count; 205 u32 version; 206 int rxinitdone; 207}; 208 209struct esd_usb2_net_priv { 210 struct can_priv can; /* must be the first member */ 211 212 atomic_t active_tx_jobs; 213 struct usb_anchor tx_submitted; 214 struct esd_tx_urb_context tx_contexts[MAX_TX_URBS]; 215 216 int open_time; 217 struct esd_usb2 *usb2; 218 struct net_device *netdev; 219 int index; 220 u8 old_state; 221 struct can_berr_counter bec; 222}; 223 224static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv, 225 struct esd_usb2_msg *msg) 226{ 227 struct net_device_stats *stats = &priv->netdev->stats; 228 struct can_frame *cf; 229 struct sk_buff *skb; 230 u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK; 231 232 if (id == ESD_EV_CAN_ERROR_EXT) { 233 u8 state = msg->msg.rx.data[0]; 234 u8 ecc = msg->msg.rx.data[1]; 235 u8 txerr = msg->msg.rx.data[2]; 236 u8 rxerr = msg->msg.rx.data[3]; 237 238 skb = alloc_can_err_skb(priv->netdev, &cf); 239 if (skb == NULL) { 240 stats->rx_dropped++; 241 return; 242 } 243 244 if (state != priv->old_state) { 245 priv->old_state = state; 246 247 switch (state & ESD_BUSSTATE_MASK) { 248 case ESD_BUSSTATE_BUSOFF: 249 priv->can.state = CAN_STATE_BUS_OFF; 250 cf->can_id |= CAN_ERR_BUSOFF; 251 can_bus_off(priv->netdev); 252 break; 253 case ESD_BUSSTATE_WARN: 254 priv->can.state = CAN_STATE_ERROR_WARNING; 255 priv->can.can_stats.error_warning++; 256 break; 257 case ESD_BUSSTATE_ERRPASSIVE: 258 priv->can.state = CAN_STATE_ERROR_PASSIVE; 259 priv->can.can_stats.error_passive++; 260 break; 261 default: 262 priv->can.state = CAN_STATE_ERROR_ACTIVE; 263 break; 264 } 265 } else { 266 priv->can.can_stats.bus_error++; 267 stats->rx_errors++; 268 269 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 270 271 switch (ecc & SJA1000_ECC_MASK) { 272 case SJA1000_ECC_BIT: 273 cf->data[2] |= CAN_ERR_PROT_BIT; 274 break; 275 case SJA1000_ECC_FORM: 276 cf->data[2] |= CAN_ERR_PROT_FORM; 277 break; 278 case SJA1000_ECC_STUFF: 279 cf->data[2] |= CAN_ERR_PROT_STUFF; 280 break; 281 default: 282 cf->data[2] |= CAN_ERR_PROT_UNSPEC; 283 cf->data[3] = ecc & SJA1000_ECC_SEG; 284 break; 285 } 286 287 /* Error occurred during transmission? */ 288 if (!(ecc & SJA1000_ECC_DIR)) 289 cf->data[2] |= CAN_ERR_PROT_TX; 290 291 if (priv->can.state == CAN_STATE_ERROR_WARNING || 292 priv->can.state == CAN_STATE_ERROR_PASSIVE) { 293 cf->data[1] = (txerr > rxerr) ? 294 CAN_ERR_CRTL_TX_PASSIVE : 295 CAN_ERR_CRTL_RX_PASSIVE; 296 } 297 cf->data[6] = txerr; 298 cf->data[7] = rxerr; 299 } 300 301 netif_rx(skb); 302 303 priv->bec.txerr = txerr; 304 priv->bec.rxerr = rxerr; 305 306 stats->rx_packets++; 307 stats->rx_bytes += cf->can_dlc; 308 } 309} 310 311static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv, 312 struct esd_usb2_msg *msg) 313{ 314 struct net_device_stats *stats = &priv->netdev->stats; 315 struct can_frame *cf; 316 struct sk_buff *skb; 317 int i; 318 u32 id; 319 320 if (!netif_device_present(priv->netdev)) 321 return; 322 323 id = le32_to_cpu(msg->msg.rx.id); 324 325 if (id & ESD_EVENT) { 326 esd_usb2_rx_event(priv, msg); 327 } else { 328 skb = alloc_can_skb(priv->netdev, &cf); 329 if (skb == NULL) { 330 stats->rx_dropped++; 331 return; 332 } 333 334 cf->can_id = id & ESD_IDMASK; 335 cf->can_dlc = get_can_dlc(msg->msg.rx.dlc); 336 337 if (id & ESD_EXTID) 338 cf->can_id |= CAN_EFF_FLAG; 339 340 if (msg->msg.rx.dlc & ESD_RTR) { 341 cf->can_id |= CAN_RTR_FLAG; 342 } else { 343 for (i = 0; i < cf->can_dlc; i++) 344 cf->data[i] = msg->msg.rx.data[i]; 345 } 346 347 netif_rx(skb); 348 349 stats->rx_packets++; 350 stats->rx_bytes += cf->can_dlc; 351 } 352 353 return; 354} 355 356static void esd_usb2_tx_done_msg(struct esd_usb2_net_priv *priv, 357 struct esd_usb2_msg *msg) 358{ 359 struct net_device_stats *stats = &priv->netdev->stats; 360 struct net_device *netdev = priv->netdev; 361 struct esd_tx_urb_context *context; 362 363 if (!netif_device_present(netdev)) 364 return; 365 366 context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)]; 367 368 if (!msg->msg.txdone.status) { 369 stats->tx_packets++; 370 stats->tx_bytes += context->dlc; 371 can_get_echo_skb(netdev, context->echo_index); 372 } else { 373 stats->tx_errors++; 374 can_free_echo_skb(netdev, context->echo_index); 375 } 376 377 /* Release context */ 378 context->echo_index = MAX_TX_URBS; 379 atomic_dec(&priv->active_tx_jobs); 380 381 netif_wake_queue(netdev); 382} 383 384static void esd_usb2_read_bulk_callback(struct urb *urb) 385{ 386 struct esd_usb2 *dev = urb->context; 387 int retval; 388 int pos = 0; 389 int i; 390 391 switch (urb->status) { 392 case 0: /* success */ 393 break; 394 395 case -ENOENT: 396 case -ESHUTDOWN: 397 return; 398 399 default: 400 dev_info(dev->udev->dev.parent, 401 "Rx URB aborted (%d)\n", urb->status); 402 goto resubmit_urb; 403 } 404 405 while (pos < urb->actual_length) { 406 struct esd_usb2_msg *msg; 407 408 msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos); 409 410 switch (msg->msg.hdr.cmd) { 411 case CMD_CAN_RX: 412 esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg); 413 break; 414 415 case CMD_CAN_TX: 416 esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net], 417 msg); 418 break; 419 } 420 421 pos += msg->msg.hdr.len << 2; 422 423 if (pos > urb->actual_length) { 424 dev_err(dev->udev->dev.parent, "format error\n"); 425 break; 426 } 427 } 428 429resubmit_urb: 430 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1), 431 urb->transfer_buffer, RX_BUFFER_SIZE, 432 esd_usb2_read_bulk_callback, dev); 433 434 retval = usb_submit_urb(urb, GFP_ATOMIC); 435 if (retval == -ENODEV) { 436 for (i = 0; i < dev->net_count; i++) { 437 if (dev->nets[i]) 438 netif_device_detach(dev->nets[i]->netdev); 439 } 440 } else if (retval) { 441 dev_err(dev->udev->dev.parent, 442 "failed resubmitting read bulk urb: %d\n", retval); 443 } 444 445 return; 446} 447 448/* 449 * callback for bulk IN urb 450 */ 451static void esd_usb2_write_bulk_callback(struct urb *urb) 452{ 453 struct esd_tx_urb_context *context = urb->context; 454 struct esd_usb2_net_priv *priv; 455 struct esd_usb2 *dev; 456 struct net_device *netdev; 457 size_t size = sizeof(struct esd_usb2_msg); 458 459 WARN_ON(!context); 460 461 priv = context->priv; 462 netdev = priv->netdev; 463 dev = priv->usb2; 464 465 /* free up our allocated buffer */ 466 usb_free_coherent(urb->dev, size, 467 urb->transfer_buffer, urb->transfer_dma); 468 469 if (!netif_device_present(netdev)) 470 return; 471 472 if (urb->status) 473 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status); 474 475 netdev->trans_start = jiffies; 476} 477 478static ssize_t show_firmware(struct device *d, 479 struct device_attribute *attr, char *buf) 480{ 481 struct usb_interface *intf = to_usb_interface(d); 482 struct esd_usb2 *dev = usb_get_intfdata(intf); 483 484 return sprintf(buf, "%d.%d.%d\n", 485 (dev->version >> 12) & 0xf, 486 (dev->version >> 8) & 0xf, 487 dev->version & 0xff); 488} 489static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL); 490 491static ssize_t show_hardware(struct device *d, 492 struct device_attribute *attr, char *buf) 493{ 494 struct usb_interface *intf = to_usb_interface(d); 495 struct esd_usb2 *dev = usb_get_intfdata(intf); 496 497 return sprintf(buf, "%d.%d.%d\n", 498 (dev->version >> 28) & 0xf, 499 (dev->version >> 24) & 0xf, 500 (dev->version >> 16) & 0xff); 501} 502static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL); 503 504static ssize_t show_nets(struct device *d, 505 struct device_attribute *attr, char *buf) 506{ 507 struct usb_interface *intf = to_usb_interface(d); 508 struct esd_usb2 *dev = usb_get_intfdata(intf); 509 510 return sprintf(buf, "%d", dev->net_count); 511} 512static DEVICE_ATTR(nets, S_IRUGO, show_nets, NULL); 513 514static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg) 515{ 516 int actual_length; 517 518 return usb_bulk_msg(dev->udev, 519 usb_sndbulkpipe(dev->udev, 2), 520 msg, 521 msg->msg.hdr.len << 2, 522 &actual_length, 523 1000); 524} 525 526static int esd_usb2_wait_msg(struct esd_usb2 *dev, 527 struct esd_usb2_msg *msg) 528{ 529 int actual_length; 530 531 return usb_bulk_msg(dev->udev, 532 usb_rcvbulkpipe(dev->udev, 1), 533 msg, 534 sizeof(*msg), 535 &actual_length, 536 1000); 537} 538 539static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev) 540{ 541 int i, err = 0; 542 543 if (dev->rxinitdone) 544 return 0; 545 546 for (i = 0; i < MAX_RX_URBS; i++) { 547 struct urb *urb = NULL; 548 u8 *buf = NULL; 549 550 /* create a URB, and a buffer for it */ 551 urb = usb_alloc_urb(0, GFP_KERNEL); 552 if (!urb) { 553 dev_warn(dev->udev->dev.parent, 554 "No memory left for URBs\n"); 555 err = -ENOMEM; 556 break; 557 } 558 559 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, 560 &urb->transfer_dma); 561 if (!buf) { 562 dev_warn(dev->udev->dev.parent, 563 "No memory left for USB buffer\n"); 564 err = -ENOMEM; 565 goto freeurb; 566 } 567 568 usb_fill_bulk_urb(urb, dev->udev, 569 usb_rcvbulkpipe(dev->udev, 1), 570 buf, RX_BUFFER_SIZE, 571 esd_usb2_read_bulk_callback, dev); 572 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 573 usb_anchor_urb(urb, &dev->rx_submitted); 574 575 err = usb_submit_urb(urb, GFP_KERNEL); 576 if (err) { 577 usb_unanchor_urb(urb); 578 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, 579 urb->transfer_dma); 580 } 581 582freeurb: 583 /* Drop reference, USB core will take care of freeing it */ 584 usb_free_urb(urb); 585 if (err) 586 break; 587 } 588 589 /* Did we submit any URBs */ 590 if (i == 0) { 591 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n"); 592 return err; 593 } 594 595 /* Warn if we've couldn't transmit all the URBs */ 596 if (i < MAX_RX_URBS) { 597 dev_warn(dev->udev->dev.parent, 598 "rx performance may be slow\n"); 599 } 600 601 dev->rxinitdone = 1; 602 return 0; 603} 604 605/* 606 * Start interface 607 */ 608static int esd_usb2_start(struct esd_usb2_net_priv *priv) 609{ 610 struct esd_usb2 *dev = priv->usb2; 611 struct net_device *netdev = priv->netdev; 612 struct esd_usb2_msg msg; 613 int err, i; 614 615 /* 616 * Enable all IDs 617 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits). 618 * Each bit represents one 11 bit CAN identifier. A set bit 619 * enables reception of the corresponding CAN identifier. A cleared 620 * bit disabled this identifier. An additional bitmask value 621 * following the CAN 2.0A bits is used to enable reception of 622 * extended CAN frames. Only the LSB of this final mask is checked 623 * for the complete 29 bit ID range. The IDADD message also allows 624 * filter configuration for an ID subset. In this case you can add 625 * the number of the starting bitmask (0..64) to the filter.option 626 * field followed by only some bitmasks. 627 */ 628 msg.msg.hdr.cmd = CMD_IDADD; 629 msg.msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 630 msg.msg.filter.net = priv->index; 631 msg.msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 632 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++) 633 msg.msg.filter.mask[i] = cpu_to_le32(0xffffffff); 634 /* enable 29bit extended IDs */ 635 msg.msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001); 636 637 err = esd_usb2_send_msg(dev, &msg); 638 if (err) 639 goto failed; 640 641 err = esd_usb2_setup_rx_urbs(dev); 642 if (err) 643 goto failed; 644 645 priv->can.state = CAN_STATE_ERROR_ACTIVE; 646 647 return 0; 648 649failed: 650 if (err == -ENODEV) 651 netif_device_detach(netdev); 652 653 netdev_err(netdev, "couldn't start device: %d\n", err); 654 655 return err; 656} 657 658static void unlink_all_urbs(struct esd_usb2 *dev) 659{ 660 struct esd_usb2_net_priv *priv; 661 int i, j; 662 663 usb_kill_anchored_urbs(&dev->rx_submitted); 664 for (i = 0; i < dev->net_count; i++) { 665 priv = dev->nets[i]; 666 if (priv) { 667 usb_kill_anchored_urbs(&priv->tx_submitted); 668 atomic_set(&priv->active_tx_jobs, 0); 669 670 for (j = 0; j < MAX_TX_URBS; j++) 671 priv->tx_contexts[j].echo_index = MAX_TX_URBS; 672 } 673 } 674} 675 676static int esd_usb2_open(struct net_device *netdev) 677{ 678 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 679 int err; 680 681 /* common open */ 682 err = open_candev(netdev); 683 if (err) 684 return err; 685 686 /* finally start device */ 687 err = esd_usb2_start(priv); 688 if (err) { 689 netdev_warn(netdev, "couldn't start device: %d\n", err); 690 close_candev(netdev); 691 return err; 692 } 693 694 priv->open_time = jiffies; 695 696 netif_start_queue(netdev); 697 698 return 0; 699} 700 701static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb, 702 struct net_device *netdev) 703{ 704 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 705 struct esd_usb2 *dev = priv->usb2; 706 struct esd_tx_urb_context *context = NULL; 707 struct net_device_stats *stats = &netdev->stats; 708 struct can_frame *cf = (struct can_frame *)skb->data; 709 struct esd_usb2_msg *msg; 710 struct urb *urb; 711 u8 *buf; 712 int i, err; 713 int ret = NETDEV_TX_OK; 714 size_t size = sizeof(struct esd_usb2_msg); 715 716 if (can_dropped_invalid_skb(netdev, skb)) 717 return NETDEV_TX_OK; 718 719 /* create a URB, and a buffer for it, and copy the data to the URB */ 720 urb = usb_alloc_urb(0, GFP_ATOMIC); 721 if (!urb) { 722 netdev_err(netdev, "No memory left for URBs\n"); 723 stats->tx_dropped++; 724 dev_kfree_skb(skb); 725 goto nourbmem; 726 } 727 728 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, 729 &urb->transfer_dma); 730 if (!buf) { 731 netdev_err(netdev, "No memory left for USB buffer\n"); 732 stats->tx_dropped++; 733 dev_kfree_skb(skb); 734 goto nobufmem; 735 } 736 737 msg = (struct esd_usb2_msg *)buf; 738 739 msg->msg.hdr.len = 3; /* minimal length */ 740 msg->msg.hdr.cmd = CMD_CAN_TX; 741 msg->msg.tx.net = priv->index; 742 msg->msg.tx.dlc = cf->can_dlc; 743 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); 744 745 if (cf->can_id & CAN_RTR_FLAG) 746 msg->msg.tx.dlc |= ESD_RTR; 747 748 if (cf->can_id & CAN_EFF_FLAG) 749 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID); 750 751 for (i = 0; i < cf->can_dlc; i++) 752 msg->msg.tx.data[i] = cf->data[i]; 753 754 msg->msg.hdr.len += (cf->can_dlc + 3) >> 2; 755 756 for (i = 0; i < MAX_TX_URBS; i++) { 757 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { 758 context = &priv->tx_contexts[i]; 759 break; 760 } 761 } 762 763 /* 764 * This may never happen. 765 */ 766 if (!context) { 767 netdev_warn(netdev, "couldn't find free context\n"); 768 ret = NETDEV_TX_BUSY; 769 goto releasebuf; 770 } 771 772 context->priv = priv; 773 context->echo_index = i; 774 context->dlc = cf->can_dlc; 775 776 /* hnd must not be 0 - MSB is stripped in txdone handling */ 777 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */ 778 779 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, 780 msg->msg.hdr.len << 2, 781 esd_usb2_write_bulk_callback, context); 782 783 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 784 785 usb_anchor_urb(urb, &priv->tx_submitted); 786 787 can_put_echo_skb(skb, netdev, context->echo_index); 788 789 atomic_inc(&priv->active_tx_jobs); 790 791 /* Slow down tx path */ 792 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS) 793 netif_stop_queue(netdev); 794 795 err = usb_submit_urb(urb, GFP_ATOMIC); 796 if (err) { 797 can_free_echo_skb(netdev, context->echo_index); 798 799 atomic_dec(&priv->active_tx_jobs); 800 usb_unanchor_urb(urb); 801 802 stats->tx_dropped++; 803 804 if (err == -ENODEV) 805 netif_device_detach(netdev); 806 else 807 netdev_warn(netdev, "failed tx_urb %d\n", err); 808 809 goto releasebuf; 810 } 811 812 netdev->trans_start = jiffies; 813 814 /* 815 * Release our reference to this URB, the USB core will eventually free 816 * it entirely. 817 */ 818 usb_free_urb(urb); 819 820 return NETDEV_TX_OK; 821 822releasebuf: 823 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); 824 825nobufmem: 826 usb_free_urb(urb); 827 828nourbmem: 829 return ret; 830} 831 832static int esd_usb2_close(struct net_device *netdev) 833{ 834 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 835 struct esd_usb2_msg msg; 836 int i; 837 838 /* Disable all IDs (see esd_usb2_start()) */ 839 msg.msg.hdr.cmd = CMD_IDADD; 840 msg.msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 841 msg.msg.filter.net = priv->index; 842 msg.msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 843 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++) 844 msg.msg.filter.mask[i] = 0; 845 if (esd_usb2_send_msg(priv->usb2, &msg) < 0) 846 netdev_err(netdev, "sending idadd message failed\n"); 847 848 /* set CAN controller to reset mode */ 849 msg.msg.hdr.len = 2; 850 msg.msg.hdr.cmd = CMD_SETBAUD; 851 msg.msg.setbaud.net = priv->index; 852 msg.msg.setbaud.rsvd = 0; 853 msg.msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE); 854 if (esd_usb2_send_msg(priv->usb2, &msg) < 0) 855 netdev_err(netdev, "sending setbaud message failed\n"); 856 857 priv->can.state = CAN_STATE_STOPPED; 858 859 netif_stop_queue(netdev); 860 861 close_candev(netdev); 862 863 priv->open_time = 0; 864 865 return 0; 866} 867 868static const struct net_device_ops esd_usb2_netdev_ops = { 869 .ndo_open = esd_usb2_open, 870 .ndo_stop = esd_usb2_close, 871 .ndo_start_xmit = esd_usb2_start_xmit, 872}; 873 874static struct can_bittiming_const esd_usb2_bittiming_const = { 875 .name = "esd_usb2", 876 .tseg1_min = ESD_USB2_TSEG1_MIN, 877 .tseg1_max = ESD_USB2_TSEG1_MAX, 878 .tseg2_min = ESD_USB2_TSEG2_MIN, 879 .tseg2_max = ESD_USB2_TSEG2_MAX, 880 .sjw_max = ESD_USB2_SJW_MAX, 881 .brp_min = ESD_USB2_BRP_MIN, 882 .brp_max = ESD_USB2_BRP_MAX, 883 .brp_inc = ESD_USB2_BRP_INC, 884}; 885 886static int esd_usb2_set_bittiming(struct net_device *netdev) 887{ 888 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 889 struct can_bittiming *bt = &priv->can.bittiming; 890 struct esd_usb2_msg msg; 891 u32 canbtr; 892 893 canbtr = ESD_USB2_UBR; 894 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1); 895 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1)) 896 << ESD_USB2_SJW_SHIFT; 897 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1) 898 & (ESD_USB2_TSEG1_MAX - 1)) 899 << ESD_USB2_TSEG1_SHIFT; 900 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1)) 901 << ESD_USB2_TSEG2_SHIFT; 902 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 903 canbtr |= ESD_USB2_3_SAMPLES; 904 905 msg.msg.hdr.len = 2; 906 msg.msg.hdr.cmd = CMD_SETBAUD; 907 msg.msg.setbaud.net = priv->index; 908 msg.msg.setbaud.rsvd = 0; 909 msg.msg.setbaud.baud = cpu_to_le32(canbtr); 910 911 netdev_info(netdev, "setting BTR=%#x\n", canbtr); 912 913 return esd_usb2_send_msg(priv->usb2, &msg); 914} 915 916static int esd_usb2_get_berr_counter(const struct net_device *netdev, 917 struct can_berr_counter *bec) 918{ 919 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 920 921 bec->txerr = priv->bec.txerr; 922 bec->rxerr = priv->bec.rxerr; 923 924 return 0; 925} 926 927static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode) 928{ 929 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 930 931 if (!priv->open_time) 932 return -EINVAL; 933 934 switch (mode) { 935 case CAN_MODE_START: 936 netif_wake_queue(netdev); 937 break; 938 939 default: 940 return -EOPNOTSUPP; 941 } 942 943 return 0; 944} 945 946static int esd_usb2_probe_one_net(struct usb_interface *intf, int index) 947{ 948 struct esd_usb2 *dev = usb_get_intfdata(intf); 949 struct net_device *netdev; 950 struct esd_usb2_net_priv *priv; 951 int err = 0; 952 int i; 953 954 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS); 955 if (!netdev) { 956 dev_err(&intf->dev, "couldn't alloc candev\n"); 957 err = -ENOMEM; 958 goto done; 959 } 960 961 priv = netdev_priv(netdev); 962 963 init_usb_anchor(&priv->tx_submitted); 964 atomic_set(&priv->active_tx_jobs, 0); 965 966 for (i = 0; i < MAX_TX_URBS; i++) 967 priv->tx_contexts[i].echo_index = MAX_TX_URBS; 968 969 priv->usb2 = dev; 970 priv->netdev = netdev; 971 priv->index = index; 972 973 priv->can.state = CAN_STATE_STOPPED; 974 priv->can.clock.freq = ESD_USB2_CAN_CLOCK; 975 priv->can.bittiming_const = &esd_usb2_bittiming_const; 976 priv->can.do_set_bittiming = esd_usb2_set_bittiming; 977 priv->can.do_set_mode = esd_usb2_set_mode; 978 priv->can.do_get_berr_counter = esd_usb2_get_berr_counter; 979 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES; 980 981 netdev->flags |= IFF_ECHO; /* we support local echo */ 982 983 netdev->netdev_ops = &esd_usb2_netdev_ops; 984 985 SET_NETDEV_DEV(netdev, &intf->dev); 986 987 err = register_candev(netdev); 988 if (err) { 989 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err); 990 free_candev(netdev); 991 err = -ENOMEM; 992 goto done; 993 } 994 995 dev->nets[index] = priv; 996 netdev_info(netdev, "device %s registered\n", netdev->name); 997 998done: 999 return err; 1000} 1001 1002/* 1003 * probe function for new USB2 devices 1004 * 1005 * check version information and number of available 1006 * CAN interfaces 1007 */ 1008static int esd_usb2_probe(struct usb_interface *intf, 1009 const struct usb_device_id *id) 1010{ 1011 struct esd_usb2 *dev; 1012 struct esd_usb2_msg msg; 1013 int i, err; 1014 1015 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 1016 if (!dev) { 1017 err = -ENOMEM; 1018 goto done; 1019 } 1020 1021 dev->udev = interface_to_usbdev(intf); 1022 1023 init_usb_anchor(&dev->rx_submitted); 1024 1025 usb_set_intfdata(intf, dev); 1026 1027 /* query number of CAN interfaces (nets) */ 1028 msg.msg.hdr.cmd = CMD_VERSION; 1029 msg.msg.hdr.len = 2; 1030 msg.msg.version.rsvd = 0; 1031 msg.msg.version.flags = 0; 1032 msg.msg.version.drv_version = 0; 1033 1034 err = esd_usb2_send_msg(dev, &msg); 1035 if (err < 0) { 1036 dev_err(&intf->dev, "sending version message failed\n"); 1037 goto free_dev; 1038 } 1039 1040 err = esd_usb2_wait_msg(dev, &msg); 1041 if (err < 0) { 1042 dev_err(&intf->dev, "no version message answer\n"); 1043 goto free_dev; 1044 } 1045 1046 dev->net_count = (int)msg.msg.version_reply.nets; 1047 dev->version = le32_to_cpu(msg.msg.version_reply.version); 1048 1049 if (device_create_file(&intf->dev, &dev_attr_firmware)) 1050 dev_err(&intf->dev, 1051 "Couldn't create device file for firmware\n"); 1052 1053 if (device_create_file(&intf->dev, &dev_attr_hardware)) 1054 dev_err(&intf->dev, 1055 "Couldn't create device file for hardware\n"); 1056 1057 if (device_create_file(&intf->dev, &dev_attr_nets)) 1058 dev_err(&intf->dev, 1059 "Couldn't create device file for nets\n"); 1060 1061 /* do per device probing */ 1062 for (i = 0; i < dev->net_count; i++) 1063 esd_usb2_probe_one_net(intf, i); 1064 1065 return 0; 1066 1067free_dev: 1068 kfree(dev); 1069done: 1070 return err; 1071} 1072 1073/* 1074 * called by the usb core when the device is removed from the system 1075 */ 1076static void esd_usb2_disconnect(struct usb_interface *intf) 1077{ 1078 struct esd_usb2 *dev = usb_get_intfdata(intf); 1079 struct net_device *netdev; 1080 int i; 1081 1082 device_remove_file(&intf->dev, &dev_attr_firmware); 1083 device_remove_file(&intf->dev, &dev_attr_hardware); 1084 device_remove_file(&intf->dev, &dev_attr_nets); 1085 1086 usb_set_intfdata(intf, NULL); 1087 1088 if (dev) { 1089 for (i = 0; i < dev->net_count; i++) { 1090 if (dev->nets[i]) { 1091 netdev = dev->nets[i]->netdev; 1092 unregister_netdev(netdev); 1093 free_candev(netdev); 1094 } 1095 } 1096 unlink_all_urbs(dev); 1097 } 1098} 1099 1100/* usb specific object needed to register this driver with the usb subsystem */ 1101static struct usb_driver esd_usb2_driver = { 1102 .name = "esd_usb2", 1103 .probe = esd_usb2_probe, 1104 .disconnect = esd_usb2_disconnect, 1105 .id_table = esd_usb2_table, 1106}; 1107 1108module_usb_driver(esd_usb2_driver); 1109