esd_usb2.c revision 96d8e90382dc336b5de401164597edfdc2e8d9f1
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 occured 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 dev_info(netdev->dev.parent, "Tx URB aborted (%d)\n", 474 urb->status); 475 476 netdev->trans_start = jiffies; 477} 478 479static ssize_t show_firmware(struct device *d, 480 struct device_attribute *attr, char *buf) 481{ 482 struct usb_interface *intf = to_usb_interface(d); 483 struct esd_usb2 *dev = usb_get_intfdata(intf); 484 485 return sprintf(buf, "%d.%d.%d\n", 486 (dev->version >> 12) & 0xf, 487 (dev->version >> 8) & 0xf, 488 dev->version & 0xff); 489} 490static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL); 491 492static ssize_t show_hardware(struct device *d, 493 struct device_attribute *attr, char *buf) 494{ 495 struct usb_interface *intf = to_usb_interface(d); 496 struct esd_usb2 *dev = usb_get_intfdata(intf); 497 498 return sprintf(buf, "%d.%d.%d\n", 499 (dev->version >> 28) & 0xf, 500 (dev->version >> 24) & 0xf, 501 (dev->version >> 16) & 0xff); 502} 503static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL); 504 505static ssize_t show_nets(struct device *d, 506 struct device_attribute *attr, char *buf) 507{ 508 struct usb_interface *intf = to_usb_interface(d); 509 struct esd_usb2 *dev = usb_get_intfdata(intf); 510 511 return sprintf(buf, "%d", dev->net_count); 512} 513static DEVICE_ATTR(nets, S_IRUGO, show_nets, NULL); 514 515static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg) 516{ 517 int actual_length; 518 519 return usb_bulk_msg(dev->udev, 520 usb_sndbulkpipe(dev->udev, 2), 521 msg, 522 msg->msg.hdr.len << 2, 523 &actual_length, 524 1000); 525} 526 527static int esd_usb2_wait_msg(struct esd_usb2 *dev, 528 struct esd_usb2_msg *msg) 529{ 530 int actual_length; 531 532 return usb_bulk_msg(dev->udev, 533 usb_rcvbulkpipe(dev->udev, 1), 534 msg, 535 sizeof(*msg), 536 &actual_length, 537 1000); 538} 539 540static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev) 541{ 542 int i, err = 0; 543 544 if (dev->rxinitdone) 545 return 0; 546 547 for (i = 0; i < MAX_RX_URBS; i++) { 548 struct urb *urb = NULL; 549 u8 *buf = NULL; 550 551 /* create a URB, and a buffer for it */ 552 urb = usb_alloc_urb(0, GFP_KERNEL); 553 if (!urb) { 554 dev_warn(dev->udev->dev.parent, 555 "No memory left for URBs\n"); 556 err = -ENOMEM; 557 break; 558 } 559 560 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, 561 &urb->transfer_dma); 562 if (!buf) { 563 dev_warn(dev->udev->dev.parent, 564 "No memory left for USB buffer\n"); 565 err = -ENOMEM; 566 goto freeurb; 567 } 568 569 usb_fill_bulk_urb(urb, dev->udev, 570 usb_rcvbulkpipe(dev->udev, 1), 571 buf, RX_BUFFER_SIZE, 572 esd_usb2_read_bulk_callback, dev); 573 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 574 usb_anchor_urb(urb, &dev->rx_submitted); 575 576 err = usb_submit_urb(urb, GFP_KERNEL); 577 if (err) { 578 usb_unanchor_urb(urb); 579 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, 580 urb->transfer_dma); 581 } 582 583freeurb: 584 /* Drop reference, USB core will take care of freeing it */ 585 usb_free_urb(urb); 586 if (err) 587 break; 588 } 589 590 /* Did we submit any URBs */ 591 if (i == 0) { 592 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n"); 593 return err; 594 } 595 596 /* Warn if we've couldn't transmit all the URBs */ 597 if (i < MAX_RX_URBS) { 598 dev_warn(dev->udev->dev.parent, 599 "rx performance may be slow\n"); 600 } 601 602 dev->rxinitdone = 1; 603 return 0; 604} 605 606/* 607 * Start interface 608 */ 609static int esd_usb2_start(struct esd_usb2_net_priv *priv) 610{ 611 struct esd_usb2 *dev = priv->usb2; 612 struct net_device *netdev = priv->netdev; 613 struct esd_usb2_msg msg; 614 int err, i; 615 616 /* 617 * Enable all IDs 618 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits). 619 * Each bit represents one 11 bit CAN identifier. A set bit 620 * enables reception of the corresponding CAN identifier. A cleared 621 * bit disabled this identifier. An additional bitmask value 622 * following the CAN 2.0A bits is used to enable reception of 623 * extended CAN frames. Only the LSB of this final mask is checked 624 * for the complete 29 bit ID range. The IDADD message also allows 625 * filter configuration for an ID subset. In this case you can add 626 * the number of the starting bitmask (0..64) to the filter.option 627 * field followed by only some bitmasks. 628 */ 629 msg.msg.hdr.cmd = CMD_IDADD; 630 msg.msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 631 msg.msg.filter.net = priv->index; 632 msg.msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 633 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++) 634 msg.msg.filter.mask[i] = cpu_to_le32(0xffffffff); 635 /* enable 29bit extended IDs */ 636 msg.msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001); 637 638 err = esd_usb2_send_msg(dev, &msg); 639 if (err) 640 goto failed; 641 642 err = esd_usb2_setup_rx_urbs(dev); 643 if (err) 644 goto failed; 645 646 priv->can.state = CAN_STATE_ERROR_ACTIVE; 647 648 return 0; 649 650failed: 651 if (err == -ENODEV) 652 netif_device_detach(netdev); 653 654 dev_err(netdev->dev.parent, "couldn't start device: %d\n", err); 655 656 return err; 657} 658 659static void unlink_all_urbs(struct esd_usb2 *dev) 660{ 661 struct esd_usb2_net_priv *priv; 662 int i; 663 664 usb_kill_anchored_urbs(&dev->rx_submitted); 665 for (i = 0; i < dev->net_count; i++) { 666 priv = dev->nets[i]; 667 if (priv) { 668 usb_kill_anchored_urbs(&priv->tx_submitted); 669 atomic_set(&priv->active_tx_jobs, 0); 670 671 for (i = 0; i < MAX_TX_URBS; i++) 672 priv->tx_contexts[i].echo_index = MAX_TX_URBS; 673 } 674 } 675} 676 677static int esd_usb2_open(struct net_device *netdev) 678{ 679 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 680 int err; 681 682 /* common open */ 683 err = open_candev(netdev); 684 if (err) 685 return err; 686 687 /* finally start device */ 688 err = esd_usb2_start(priv); 689 if (err) { 690 dev_warn(netdev->dev.parent, 691 "couldn't start device: %d\n", err); 692 close_candev(netdev); 693 return err; 694 } 695 696 priv->open_time = jiffies; 697 698 netif_start_queue(netdev); 699 700 return 0; 701} 702 703static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb, 704 struct net_device *netdev) 705{ 706 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 707 struct esd_usb2 *dev = priv->usb2; 708 struct esd_tx_urb_context *context = NULL; 709 struct net_device_stats *stats = &netdev->stats; 710 struct can_frame *cf = (struct can_frame *)skb->data; 711 struct esd_usb2_msg *msg; 712 struct urb *urb; 713 u8 *buf; 714 int i, err; 715 int ret = NETDEV_TX_OK; 716 size_t size = sizeof(struct esd_usb2_msg); 717 718 if (can_dropped_invalid_skb(netdev, skb)) 719 return NETDEV_TX_OK; 720 721 /* create a URB, and a buffer for it, and copy the data to the URB */ 722 urb = usb_alloc_urb(0, GFP_ATOMIC); 723 if (!urb) { 724 dev_err(netdev->dev.parent, "No memory left for URBs\n"); 725 stats->tx_dropped++; 726 dev_kfree_skb(skb); 727 goto nourbmem; 728 } 729 730 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, 731 &urb->transfer_dma); 732 if (!buf) { 733 dev_err(netdev->dev.parent, "No memory left for USB buffer\n"); 734 stats->tx_dropped++; 735 dev_kfree_skb(skb); 736 goto nobufmem; 737 } 738 739 msg = (struct esd_usb2_msg *)buf; 740 741 msg->msg.hdr.len = 3; /* minimal length */ 742 msg->msg.hdr.cmd = CMD_CAN_TX; 743 msg->msg.tx.net = priv->index; 744 msg->msg.tx.dlc = cf->can_dlc; 745 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); 746 747 if (cf->can_id & CAN_RTR_FLAG) 748 msg->msg.tx.dlc |= ESD_RTR; 749 750 if (cf->can_id & CAN_EFF_FLAG) 751 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID); 752 753 for (i = 0; i < cf->can_dlc; i++) 754 msg->msg.tx.data[i] = cf->data[i]; 755 756 msg->msg.hdr.len += (cf->can_dlc + 3) >> 2; 757 758 for (i = 0; i < MAX_TX_URBS; i++) { 759 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { 760 context = &priv->tx_contexts[i]; 761 break; 762 } 763 } 764 765 /* 766 * This may never happen. 767 */ 768 if (!context) { 769 dev_warn(netdev->dev.parent, "couldn't find free context\n"); 770 ret = NETDEV_TX_BUSY; 771 goto releasebuf; 772 } 773 774 context->priv = priv; 775 context->echo_index = i; 776 context->dlc = cf->can_dlc; 777 778 /* hnd must not be 0 - MSB is stripped in txdone handling */ 779 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */ 780 781 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, 782 msg->msg.hdr.len << 2, 783 esd_usb2_write_bulk_callback, context); 784 785 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 786 787 usb_anchor_urb(urb, &priv->tx_submitted); 788 789 can_put_echo_skb(skb, netdev, context->echo_index); 790 791 atomic_inc(&priv->active_tx_jobs); 792 793 /* Slow down tx path */ 794 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS) 795 netif_stop_queue(netdev); 796 797 err = usb_submit_urb(urb, GFP_ATOMIC); 798 if (err) { 799 can_free_echo_skb(netdev, context->echo_index); 800 801 atomic_dec(&priv->active_tx_jobs); 802 usb_unanchor_urb(urb); 803 804 stats->tx_dropped++; 805 806 if (err == -ENODEV) 807 netif_device_detach(netdev); 808 else 809 dev_warn(netdev->dev.parent, "failed tx_urb %d\n", err); 810 811 goto releasebuf; 812 } 813 814 netdev->trans_start = jiffies; 815 816 /* 817 * Release our reference to this URB, the USB core will eventually free 818 * it entirely. 819 */ 820 usb_free_urb(urb); 821 822 return NETDEV_TX_OK; 823 824releasebuf: 825 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); 826 827nobufmem: 828 usb_free_urb(urb); 829 830nourbmem: 831 return ret; 832} 833 834static int esd_usb2_close(struct net_device *netdev) 835{ 836 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 837 struct esd_usb2_msg msg; 838 int i; 839 840 /* Disable all IDs (see esd_usb2_start()) */ 841 msg.msg.hdr.cmd = CMD_IDADD; 842 msg.msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 843 msg.msg.filter.net = priv->index; 844 msg.msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 845 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++) 846 msg.msg.filter.mask[i] = 0; 847 if (esd_usb2_send_msg(priv->usb2, &msg) < 0) 848 dev_err(netdev->dev.parent, "sending idadd message failed\n"); 849 850 /* set CAN controller to reset mode */ 851 msg.msg.hdr.len = 2; 852 msg.msg.hdr.cmd = CMD_SETBAUD; 853 msg.msg.setbaud.net = priv->index; 854 msg.msg.setbaud.rsvd = 0; 855 msg.msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE); 856 if (esd_usb2_send_msg(priv->usb2, &msg) < 0) 857 dev_err(netdev->dev.parent, "sending setbaud message failed\n"); 858 859 priv->can.state = CAN_STATE_STOPPED; 860 861 netif_stop_queue(netdev); 862 863 close_candev(netdev); 864 865 priv->open_time = 0; 866 867 return 0; 868} 869 870static const struct net_device_ops esd_usb2_netdev_ops = { 871 .ndo_open = esd_usb2_open, 872 .ndo_stop = esd_usb2_close, 873 .ndo_start_xmit = esd_usb2_start_xmit, 874}; 875 876static struct can_bittiming_const esd_usb2_bittiming_const = { 877 .name = "esd_usb2", 878 .tseg1_min = ESD_USB2_TSEG1_MIN, 879 .tseg1_max = ESD_USB2_TSEG1_MAX, 880 .tseg2_min = ESD_USB2_TSEG2_MIN, 881 .tseg2_max = ESD_USB2_TSEG2_MAX, 882 .sjw_max = ESD_USB2_SJW_MAX, 883 .brp_min = ESD_USB2_BRP_MIN, 884 .brp_max = ESD_USB2_BRP_MAX, 885 .brp_inc = ESD_USB2_BRP_INC, 886}; 887 888static int esd_usb2_set_bittiming(struct net_device *netdev) 889{ 890 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 891 struct can_bittiming *bt = &priv->can.bittiming; 892 struct esd_usb2_msg msg; 893 u32 canbtr; 894 895 canbtr = ESD_USB2_UBR; 896 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1); 897 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1)) 898 << ESD_USB2_SJW_SHIFT; 899 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1) 900 & (ESD_USB2_TSEG1_MAX - 1)) 901 << ESD_USB2_TSEG1_SHIFT; 902 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1)) 903 << ESD_USB2_TSEG2_SHIFT; 904 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 905 canbtr |= ESD_USB2_3_SAMPLES; 906 907 msg.msg.hdr.len = 2; 908 msg.msg.hdr.cmd = CMD_SETBAUD; 909 msg.msg.setbaud.net = priv->index; 910 msg.msg.setbaud.rsvd = 0; 911 msg.msg.setbaud.baud = cpu_to_le32(canbtr); 912 913 dev_info(netdev->dev.parent, "setting BTR=%#x\n", canbtr); 914 915 return esd_usb2_send_msg(priv->usb2, &msg); 916} 917 918static int esd_usb2_get_berr_counter(const struct net_device *netdev, 919 struct can_berr_counter *bec) 920{ 921 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 922 923 bec->txerr = priv->bec.txerr; 924 bec->rxerr = priv->bec.rxerr; 925 926 return 0; 927} 928 929static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode) 930{ 931 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 932 933 if (!priv->open_time) 934 return -EINVAL; 935 936 switch (mode) { 937 case CAN_MODE_START: 938 netif_wake_queue(netdev); 939 break; 940 941 default: 942 return -EOPNOTSUPP; 943 } 944 945 return 0; 946} 947 948static int esd_usb2_probe_one_net(struct usb_interface *intf, int index) 949{ 950 struct esd_usb2 *dev = usb_get_intfdata(intf); 951 struct net_device *netdev; 952 struct esd_usb2_net_priv *priv; 953 int err = 0; 954 int i; 955 956 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS); 957 if (!netdev) { 958 dev_err(&intf->dev, "couldn't alloc candev\n"); 959 err = -ENOMEM; 960 goto done; 961 } 962 963 priv = netdev_priv(netdev); 964 965 init_usb_anchor(&priv->tx_submitted); 966 atomic_set(&priv->active_tx_jobs, 0); 967 968 for (i = 0; i < MAX_TX_URBS; i++) 969 priv->tx_contexts[i].echo_index = MAX_TX_URBS; 970 971 priv->usb2 = dev; 972 priv->netdev = netdev; 973 priv->index = index; 974 975 priv->can.state = CAN_STATE_STOPPED; 976 priv->can.clock.freq = ESD_USB2_CAN_CLOCK; 977 priv->can.bittiming_const = &esd_usb2_bittiming_const; 978 priv->can.do_set_bittiming = esd_usb2_set_bittiming; 979 priv->can.do_set_mode = esd_usb2_set_mode; 980 priv->can.do_get_berr_counter = esd_usb2_get_berr_counter; 981 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES; 982 983 netdev->flags |= IFF_ECHO; /* we support local echo */ 984 985 netdev->netdev_ops = &esd_usb2_netdev_ops; 986 987 SET_NETDEV_DEV(netdev, &intf->dev); 988 989 err = register_candev(netdev); 990 if (err) { 991 dev_err(&intf->dev, 992 "couldn't register CAN device: %d\n", err); 993 free_candev(netdev); 994 err = -ENOMEM; 995 goto done; 996 } 997 998 dev->nets[index] = priv; 999 dev_info(netdev->dev.parent, "device %s registered\n", netdev->name); 1000 1001done: 1002 return err; 1003} 1004 1005/* 1006 * probe function for new USB2 devices 1007 * 1008 * check version information and number of available 1009 * CAN interfaces 1010 */ 1011static int esd_usb2_probe(struct usb_interface *intf, 1012 const struct usb_device_id *id) 1013{ 1014 struct esd_usb2 *dev; 1015 struct esd_usb2_msg msg; 1016 int i, err; 1017 1018 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 1019 if (!dev) { 1020 err = -ENOMEM; 1021 goto done; 1022 } 1023 1024 dev->udev = interface_to_usbdev(intf); 1025 1026 init_usb_anchor(&dev->rx_submitted); 1027 1028 usb_set_intfdata(intf, dev); 1029 1030 /* query number of CAN interfaces (nets) */ 1031 msg.msg.hdr.cmd = CMD_VERSION; 1032 msg.msg.hdr.len = 2; 1033 msg.msg.version.rsvd = 0; 1034 msg.msg.version.flags = 0; 1035 msg.msg.version.drv_version = 0; 1036 1037 err = esd_usb2_send_msg(dev, &msg); 1038 if (err < 0) { 1039 dev_err(&intf->dev, "sending version message failed\n"); 1040 goto free_dev; 1041 } 1042 1043 err = esd_usb2_wait_msg(dev, &msg); 1044 if (err < 0) { 1045 dev_err(&intf->dev, "no version message answer\n"); 1046 goto free_dev; 1047 } 1048 1049 dev->net_count = (int)msg.msg.version_reply.nets; 1050 dev->version = le32_to_cpu(msg.msg.version_reply.version); 1051 1052 if (device_create_file(&intf->dev, &dev_attr_firmware)) 1053 dev_err(&intf->dev, 1054 "Couldn't create device file for firmware\n"); 1055 1056 if (device_create_file(&intf->dev, &dev_attr_hardware)) 1057 dev_err(&intf->dev, 1058 "Couldn't create device file for hardware\n"); 1059 1060 if (device_create_file(&intf->dev, &dev_attr_nets)) 1061 dev_err(&intf->dev, 1062 "Couldn't create device file for nets\n"); 1063 1064 /* do per device probing */ 1065 for (i = 0; i < dev->net_count; i++) 1066 esd_usb2_probe_one_net(intf, i); 1067 1068 return 0; 1069 1070free_dev: 1071 kfree(dev); 1072done: 1073 return err; 1074} 1075 1076/* 1077 * called by the usb core when the device is removed from the system 1078 */ 1079static void esd_usb2_disconnect(struct usb_interface *intf) 1080{ 1081 struct esd_usb2 *dev = usb_get_intfdata(intf); 1082 struct net_device *netdev; 1083 int i; 1084 1085 device_remove_file(&intf->dev, &dev_attr_firmware); 1086 device_remove_file(&intf->dev, &dev_attr_hardware); 1087 device_remove_file(&intf->dev, &dev_attr_nets); 1088 1089 usb_set_intfdata(intf, NULL); 1090 1091 if (dev) { 1092 for (i = 0; i < dev->net_count; i++) { 1093 if (dev->nets[i]) { 1094 netdev = dev->nets[i]->netdev; 1095 unregister_netdev(netdev); 1096 free_candev(netdev); 1097 } 1098 } 1099 unlink_all_urbs(dev); 1100 } 1101} 1102 1103/* usb specific object needed to register this driver with the usb subsystem */ 1104static struct usb_driver esd_usb2_driver = { 1105 .name = "esd_usb2", 1106 .probe = esd_usb2_probe, 1107 .disconnect = esd_usb2_disconnect, 1108 .id_table = esd_usb2_table, 1109}; 1110 1111static int __init esd_usb2_init(void) 1112{ 1113 int err; 1114 1115 /* register this driver with the USB subsystem */ 1116 err = usb_register(&esd_usb2_driver); 1117 1118 if (err) { 1119 err("usb_register failed. Error number %d\n", err); 1120 return err; 1121 } 1122 1123 return 0; 1124} 1125module_init(esd_usb2_init); 1126 1127static void __exit esd_usb2_exit(void) 1128{ 1129 /* deregister this driver with the USB subsystem */ 1130 usb_deregister(&esd_usb2_driver); 1131} 1132module_exit(esd_usb2_exit); 1133