esd_usb2.c revision 7653ebd5f6a4cd1976cb82e8ef94ebbe3ff001f3
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/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 and CAN-USB/Micro 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#define USB_CANUSBM_PRODUCT_ID 0x0011 38 39#define ESD_USB2_CAN_CLOCK 60000000 40#define ESD_USBM_CAN_CLOCK 36000000 41#define ESD_USB2_MAX_NETS 2 42 43/* USB2 commands */ 44#define CMD_VERSION 1 /* also used for VERSION_REPLY */ 45#define CMD_CAN_RX 2 /* device to host only */ 46#define CMD_CAN_TX 3 /* also used for TX_DONE */ 47#define CMD_SETBAUD 4 /* also used for SETBAUD_REPLY */ 48#define CMD_TS 5 /* also used for TS_REPLY */ 49#define CMD_IDADD 6 /* also used for IDADD_REPLY */ 50 51/* esd CAN message flags - dlc field */ 52#define ESD_RTR 0x10 53 54/* esd CAN message flags - id field */ 55#define ESD_EXTID 0x20000000 56#define ESD_EVENT 0x40000000 57#define ESD_IDMASK 0x1fffffff 58 59/* esd CAN event ids used by this driver */ 60#define ESD_EV_CAN_ERROR_EXT 2 61 62/* baudrate message flags */ 63#define ESD_USB2_UBR 0x80000000 64#define ESD_USB2_LOM 0x40000000 65#define ESD_USB2_NO_BAUDRATE 0x7fffffff 66#define ESD_USB2_TSEG1_MIN 1 67#define ESD_USB2_TSEG1_MAX 16 68#define ESD_USB2_TSEG1_SHIFT 16 69#define ESD_USB2_TSEG2_MIN 1 70#define ESD_USB2_TSEG2_MAX 8 71#define ESD_USB2_TSEG2_SHIFT 20 72#define ESD_USB2_SJW_MAX 4 73#define ESD_USB2_SJW_SHIFT 14 74#define ESD_USBM_SJW_SHIFT 24 75#define ESD_USB2_BRP_MIN 1 76#define ESD_USB2_BRP_MAX 1024 77#define ESD_USB2_BRP_INC 1 78#define ESD_USB2_3_SAMPLES 0x00800000 79 80/* esd IDADD message */ 81#define ESD_ID_ENABLE 0x80 82#define ESD_MAX_ID_SEGMENT 64 83 84/* SJA1000 ECC register (emulated by usb2 firmware) */ 85#define SJA1000_ECC_SEG 0x1F 86#define SJA1000_ECC_DIR 0x20 87#define SJA1000_ECC_ERR 0x06 88#define SJA1000_ECC_BIT 0x00 89#define SJA1000_ECC_FORM 0x40 90#define SJA1000_ECC_STUFF 0x80 91#define SJA1000_ECC_MASK 0xc0 92 93/* esd bus state event codes */ 94#define ESD_BUSSTATE_MASK 0xc0 95#define ESD_BUSSTATE_WARN 0x40 96#define ESD_BUSSTATE_ERRPASSIVE 0x80 97#define ESD_BUSSTATE_BUSOFF 0xc0 98 99#define RX_BUFFER_SIZE 1024 100#define MAX_RX_URBS 4 101#define MAX_TX_URBS 16 /* must be power of 2 */ 102 103struct header_msg { 104 u8 len; /* len is always the total message length in 32bit words */ 105 u8 cmd; 106 u8 rsvd[2]; 107}; 108 109struct version_msg { 110 u8 len; 111 u8 cmd; 112 u8 rsvd; 113 u8 flags; 114 __le32 drv_version; 115}; 116 117struct version_reply_msg { 118 u8 len; 119 u8 cmd; 120 u8 nets; 121 u8 features; 122 __le32 version; 123 u8 name[16]; 124 __le32 rsvd; 125 __le32 ts; 126}; 127 128struct rx_msg { 129 u8 len; 130 u8 cmd; 131 u8 net; 132 u8 dlc; 133 __le32 ts; 134 __le32 id; /* upper 3 bits contain flags */ 135 u8 data[8]; 136}; 137 138struct tx_msg { 139 u8 len; 140 u8 cmd; 141 u8 net; 142 u8 dlc; 143 __le32 hnd; 144 __le32 id; /* upper 3 bits contain flags */ 145 u8 data[8]; 146}; 147 148struct tx_done_msg { 149 u8 len; 150 u8 cmd; 151 u8 net; 152 u8 status; 153 __le32 hnd; 154 __le32 ts; 155}; 156 157struct id_filter_msg { 158 u8 len; 159 u8 cmd; 160 u8 net; 161 u8 option; 162 __le32 mask[ESD_MAX_ID_SEGMENT + 1]; 163}; 164 165struct set_baudrate_msg { 166 u8 len; 167 u8 cmd; 168 u8 net; 169 u8 rsvd; 170 __le32 baud; 171}; 172 173/* Main message type used between library and application */ 174struct __attribute__ ((packed)) esd_usb2_msg { 175 union { 176 struct header_msg hdr; 177 struct version_msg version; 178 struct version_reply_msg version_reply; 179 struct rx_msg rx; 180 struct tx_msg tx; 181 struct tx_done_msg txdone; 182 struct set_baudrate_msg setbaud; 183 struct id_filter_msg filter; 184 } msg; 185}; 186 187static struct usb_device_id esd_usb2_table[] = { 188 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSB2_PRODUCT_ID)}, 189 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSBM_PRODUCT_ID)}, 190 {} 191}; 192MODULE_DEVICE_TABLE(usb, esd_usb2_table); 193 194struct esd_usb2_net_priv; 195 196struct esd_tx_urb_context { 197 struct esd_usb2_net_priv *priv; 198 u32 echo_index; 199 int dlc; 200}; 201 202struct esd_usb2 { 203 struct usb_device *udev; 204 struct esd_usb2_net_priv *nets[ESD_USB2_MAX_NETS]; 205 206 struct usb_anchor rx_submitted; 207 208 int net_count; 209 u32 version; 210 int rxinitdone; 211}; 212 213struct esd_usb2_net_priv { 214 struct can_priv can; /* must be the first member */ 215 216 atomic_t active_tx_jobs; 217 struct usb_anchor tx_submitted; 218 struct esd_tx_urb_context tx_contexts[MAX_TX_URBS]; 219 220 int open_time; 221 struct esd_usb2 *usb2; 222 struct net_device *netdev; 223 int index; 224 u8 old_state; 225 struct can_berr_counter bec; 226}; 227 228static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv, 229 struct esd_usb2_msg *msg) 230{ 231 struct net_device_stats *stats = &priv->netdev->stats; 232 struct can_frame *cf; 233 struct sk_buff *skb; 234 u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK; 235 236 if (id == ESD_EV_CAN_ERROR_EXT) { 237 u8 state = msg->msg.rx.data[0]; 238 u8 ecc = msg->msg.rx.data[1]; 239 u8 txerr = msg->msg.rx.data[2]; 240 u8 rxerr = msg->msg.rx.data[3]; 241 242 skb = alloc_can_err_skb(priv->netdev, &cf); 243 if (skb == NULL) { 244 stats->rx_dropped++; 245 return; 246 } 247 248 if (state != priv->old_state) { 249 priv->old_state = state; 250 251 switch (state & ESD_BUSSTATE_MASK) { 252 case ESD_BUSSTATE_BUSOFF: 253 priv->can.state = CAN_STATE_BUS_OFF; 254 cf->can_id |= CAN_ERR_BUSOFF; 255 can_bus_off(priv->netdev); 256 break; 257 case ESD_BUSSTATE_WARN: 258 priv->can.state = CAN_STATE_ERROR_WARNING; 259 priv->can.can_stats.error_warning++; 260 break; 261 case ESD_BUSSTATE_ERRPASSIVE: 262 priv->can.state = CAN_STATE_ERROR_PASSIVE; 263 priv->can.can_stats.error_passive++; 264 break; 265 default: 266 priv->can.state = CAN_STATE_ERROR_ACTIVE; 267 break; 268 } 269 } else { 270 priv->can.can_stats.bus_error++; 271 stats->rx_errors++; 272 273 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 274 275 switch (ecc & SJA1000_ECC_MASK) { 276 case SJA1000_ECC_BIT: 277 cf->data[2] |= CAN_ERR_PROT_BIT; 278 break; 279 case SJA1000_ECC_FORM: 280 cf->data[2] |= CAN_ERR_PROT_FORM; 281 break; 282 case SJA1000_ECC_STUFF: 283 cf->data[2] |= CAN_ERR_PROT_STUFF; 284 break; 285 default: 286 cf->data[2] |= CAN_ERR_PROT_UNSPEC; 287 cf->data[3] = ecc & SJA1000_ECC_SEG; 288 break; 289 } 290 291 /* Error occurred during transmission? */ 292 if (!(ecc & SJA1000_ECC_DIR)) 293 cf->data[2] |= CAN_ERR_PROT_TX; 294 295 if (priv->can.state == CAN_STATE_ERROR_WARNING || 296 priv->can.state == CAN_STATE_ERROR_PASSIVE) { 297 cf->data[1] = (txerr > rxerr) ? 298 CAN_ERR_CRTL_TX_PASSIVE : 299 CAN_ERR_CRTL_RX_PASSIVE; 300 } 301 cf->data[6] = txerr; 302 cf->data[7] = rxerr; 303 } 304 305 netif_rx(skb); 306 307 priv->bec.txerr = txerr; 308 priv->bec.rxerr = rxerr; 309 310 stats->rx_packets++; 311 stats->rx_bytes += cf->can_dlc; 312 } 313} 314 315static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv, 316 struct esd_usb2_msg *msg) 317{ 318 struct net_device_stats *stats = &priv->netdev->stats; 319 struct can_frame *cf; 320 struct sk_buff *skb; 321 int i; 322 u32 id; 323 324 if (!netif_device_present(priv->netdev)) 325 return; 326 327 id = le32_to_cpu(msg->msg.rx.id); 328 329 if (id & ESD_EVENT) { 330 esd_usb2_rx_event(priv, msg); 331 } else { 332 skb = alloc_can_skb(priv->netdev, &cf); 333 if (skb == NULL) { 334 stats->rx_dropped++; 335 return; 336 } 337 338 cf->can_id = id & ESD_IDMASK; 339 cf->can_dlc = get_can_dlc(msg->msg.rx.dlc); 340 341 if (id & ESD_EXTID) 342 cf->can_id |= CAN_EFF_FLAG; 343 344 if (msg->msg.rx.dlc & ESD_RTR) { 345 cf->can_id |= CAN_RTR_FLAG; 346 } else { 347 for (i = 0; i < cf->can_dlc; i++) 348 cf->data[i] = msg->msg.rx.data[i]; 349 } 350 351 netif_rx(skb); 352 353 stats->rx_packets++; 354 stats->rx_bytes += cf->can_dlc; 355 } 356 357 return; 358} 359 360static void esd_usb2_tx_done_msg(struct esd_usb2_net_priv *priv, 361 struct esd_usb2_msg *msg) 362{ 363 struct net_device_stats *stats = &priv->netdev->stats; 364 struct net_device *netdev = priv->netdev; 365 struct esd_tx_urb_context *context; 366 367 if (!netif_device_present(netdev)) 368 return; 369 370 context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)]; 371 372 if (!msg->msg.txdone.status) { 373 stats->tx_packets++; 374 stats->tx_bytes += context->dlc; 375 can_get_echo_skb(netdev, context->echo_index); 376 } else { 377 stats->tx_errors++; 378 can_free_echo_skb(netdev, context->echo_index); 379 } 380 381 /* Release context */ 382 context->echo_index = MAX_TX_URBS; 383 atomic_dec(&priv->active_tx_jobs); 384 385 netif_wake_queue(netdev); 386} 387 388static void esd_usb2_read_bulk_callback(struct urb *urb) 389{ 390 struct esd_usb2 *dev = urb->context; 391 int retval; 392 int pos = 0; 393 int i; 394 395 switch (urb->status) { 396 case 0: /* success */ 397 break; 398 399 case -ENOENT: 400 case -ESHUTDOWN: 401 return; 402 403 default: 404 dev_info(dev->udev->dev.parent, 405 "Rx URB aborted (%d)\n", urb->status); 406 goto resubmit_urb; 407 } 408 409 while (pos < urb->actual_length) { 410 struct esd_usb2_msg *msg; 411 412 msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos); 413 414 switch (msg->msg.hdr.cmd) { 415 case CMD_CAN_RX: 416 esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg); 417 break; 418 419 case CMD_CAN_TX: 420 esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net], 421 msg); 422 break; 423 } 424 425 pos += msg->msg.hdr.len << 2; 426 427 if (pos > urb->actual_length) { 428 dev_err(dev->udev->dev.parent, "format error\n"); 429 break; 430 } 431 } 432 433resubmit_urb: 434 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1), 435 urb->transfer_buffer, RX_BUFFER_SIZE, 436 esd_usb2_read_bulk_callback, dev); 437 438 retval = usb_submit_urb(urb, GFP_ATOMIC); 439 if (retval == -ENODEV) { 440 for (i = 0; i < dev->net_count; i++) { 441 if (dev->nets[i]) 442 netif_device_detach(dev->nets[i]->netdev); 443 } 444 } else if (retval) { 445 dev_err(dev->udev->dev.parent, 446 "failed resubmitting read bulk urb: %d\n", retval); 447 } 448 449 return; 450} 451 452/* 453 * callback for bulk IN urb 454 */ 455static void esd_usb2_write_bulk_callback(struct urb *urb) 456{ 457 struct esd_tx_urb_context *context = urb->context; 458 struct esd_usb2_net_priv *priv; 459 struct esd_usb2 *dev; 460 struct net_device *netdev; 461 size_t size = sizeof(struct esd_usb2_msg); 462 463 WARN_ON(!context); 464 465 priv = context->priv; 466 netdev = priv->netdev; 467 dev = priv->usb2; 468 469 /* free up our allocated buffer */ 470 usb_free_coherent(urb->dev, size, 471 urb->transfer_buffer, urb->transfer_dma); 472 473 if (!netif_device_present(netdev)) 474 return; 475 476 if (urb->status) 477 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status); 478 479 netdev->trans_start = jiffies; 480} 481 482static ssize_t show_firmware(struct device *d, 483 struct device_attribute *attr, char *buf) 484{ 485 struct usb_interface *intf = to_usb_interface(d); 486 struct esd_usb2 *dev = usb_get_intfdata(intf); 487 488 return sprintf(buf, "%d.%d.%d\n", 489 (dev->version >> 12) & 0xf, 490 (dev->version >> 8) & 0xf, 491 dev->version & 0xff); 492} 493static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL); 494 495static ssize_t show_hardware(struct device *d, 496 struct device_attribute *attr, char *buf) 497{ 498 struct usb_interface *intf = to_usb_interface(d); 499 struct esd_usb2 *dev = usb_get_intfdata(intf); 500 501 return sprintf(buf, "%d.%d.%d\n", 502 (dev->version >> 28) & 0xf, 503 (dev->version >> 24) & 0xf, 504 (dev->version >> 16) & 0xff); 505} 506static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL); 507 508static ssize_t show_nets(struct device *d, 509 struct device_attribute *attr, char *buf) 510{ 511 struct usb_interface *intf = to_usb_interface(d); 512 struct esd_usb2 *dev = usb_get_intfdata(intf); 513 514 return sprintf(buf, "%d", dev->net_count); 515} 516static DEVICE_ATTR(nets, S_IRUGO, show_nets, NULL); 517 518static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg) 519{ 520 int actual_length; 521 522 return usb_bulk_msg(dev->udev, 523 usb_sndbulkpipe(dev->udev, 2), 524 msg, 525 msg->msg.hdr.len << 2, 526 &actual_length, 527 1000); 528} 529 530static int esd_usb2_wait_msg(struct esd_usb2 *dev, 531 struct esd_usb2_msg *msg) 532{ 533 int actual_length; 534 535 return usb_bulk_msg(dev->udev, 536 usb_rcvbulkpipe(dev->udev, 1), 537 msg, 538 sizeof(*msg), 539 &actual_length, 540 1000); 541} 542 543static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev) 544{ 545 int i, err = 0; 546 547 if (dev->rxinitdone) 548 return 0; 549 550 for (i = 0; i < MAX_RX_URBS; i++) { 551 struct urb *urb = NULL; 552 u8 *buf = NULL; 553 554 /* create a URB, and a buffer for it */ 555 urb = usb_alloc_urb(0, GFP_KERNEL); 556 if (!urb) { 557 dev_warn(dev->udev->dev.parent, 558 "No memory left for URBs\n"); 559 err = -ENOMEM; 560 break; 561 } 562 563 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, 564 &urb->transfer_dma); 565 if (!buf) { 566 dev_warn(dev->udev->dev.parent, 567 "No memory left for USB buffer\n"); 568 err = -ENOMEM; 569 goto freeurb; 570 } 571 572 usb_fill_bulk_urb(urb, dev->udev, 573 usb_rcvbulkpipe(dev->udev, 1), 574 buf, RX_BUFFER_SIZE, 575 esd_usb2_read_bulk_callback, dev); 576 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 577 usb_anchor_urb(urb, &dev->rx_submitted); 578 579 err = usb_submit_urb(urb, GFP_KERNEL); 580 if (err) { 581 usb_unanchor_urb(urb); 582 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, 583 urb->transfer_dma); 584 } 585 586freeurb: 587 /* Drop reference, USB core will take care of freeing it */ 588 usb_free_urb(urb); 589 if (err) 590 break; 591 } 592 593 /* Did we submit any URBs */ 594 if (i == 0) { 595 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n"); 596 return err; 597 } 598 599 /* Warn if we've couldn't transmit all the URBs */ 600 if (i < MAX_RX_URBS) { 601 dev_warn(dev->udev->dev.parent, 602 "rx performance may be slow\n"); 603 } 604 605 dev->rxinitdone = 1; 606 return 0; 607} 608 609/* 610 * Start interface 611 */ 612static int esd_usb2_start(struct esd_usb2_net_priv *priv) 613{ 614 struct esd_usb2 *dev = priv->usb2; 615 struct net_device *netdev = priv->netdev; 616 struct esd_usb2_msg msg; 617 int err, i; 618 619 /* 620 * Enable all IDs 621 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits). 622 * Each bit represents one 11 bit CAN identifier. A set bit 623 * enables reception of the corresponding CAN identifier. A cleared 624 * bit disabled this identifier. An additional bitmask value 625 * following the CAN 2.0A bits is used to enable reception of 626 * extended CAN frames. Only the LSB of this final mask is checked 627 * for the complete 29 bit ID range. The IDADD message also allows 628 * filter configuration for an ID subset. In this case you can add 629 * the number of the starting bitmask (0..64) to the filter.option 630 * field followed by only some bitmasks. 631 */ 632 msg.msg.hdr.cmd = CMD_IDADD; 633 msg.msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 634 msg.msg.filter.net = priv->index; 635 msg.msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 636 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++) 637 msg.msg.filter.mask[i] = cpu_to_le32(0xffffffff); 638 /* enable 29bit extended IDs */ 639 msg.msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001); 640 641 err = esd_usb2_send_msg(dev, &msg); 642 if (err) 643 goto failed; 644 645 err = esd_usb2_setup_rx_urbs(dev); 646 if (err) 647 goto failed; 648 649 priv->can.state = CAN_STATE_ERROR_ACTIVE; 650 651 return 0; 652 653failed: 654 if (err == -ENODEV) 655 netif_device_detach(netdev); 656 657 netdev_err(netdev, "couldn't start device: %d\n", err); 658 659 return err; 660} 661 662static void unlink_all_urbs(struct esd_usb2 *dev) 663{ 664 struct esd_usb2_net_priv *priv; 665 int i, j; 666 667 usb_kill_anchored_urbs(&dev->rx_submitted); 668 for (i = 0; i < dev->net_count; i++) { 669 priv = dev->nets[i]; 670 if (priv) { 671 usb_kill_anchored_urbs(&priv->tx_submitted); 672 atomic_set(&priv->active_tx_jobs, 0); 673 674 for (j = 0; j < MAX_TX_URBS; j++) 675 priv->tx_contexts[j].echo_index = MAX_TX_URBS; 676 } 677 } 678} 679 680static int esd_usb2_open(struct net_device *netdev) 681{ 682 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 683 int err; 684 685 /* common open */ 686 err = open_candev(netdev); 687 if (err) 688 return err; 689 690 /* finally start device */ 691 err = esd_usb2_start(priv); 692 if (err) { 693 netdev_warn(netdev, "couldn't start device: %d\n", err); 694 close_candev(netdev); 695 return err; 696 } 697 698 priv->open_time = jiffies; 699 700 netif_start_queue(netdev); 701 702 return 0; 703} 704 705static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb, 706 struct net_device *netdev) 707{ 708 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 709 struct esd_usb2 *dev = priv->usb2; 710 struct esd_tx_urb_context *context = NULL; 711 struct net_device_stats *stats = &netdev->stats; 712 struct can_frame *cf = (struct can_frame *)skb->data; 713 struct esd_usb2_msg *msg; 714 struct urb *urb; 715 u8 *buf; 716 int i, err; 717 int ret = NETDEV_TX_OK; 718 size_t size = sizeof(struct esd_usb2_msg); 719 720 if (can_dropped_invalid_skb(netdev, skb)) 721 return NETDEV_TX_OK; 722 723 /* create a URB, and a buffer for it, and copy the data to the URB */ 724 urb = usb_alloc_urb(0, GFP_ATOMIC); 725 if (!urb) { 726 netdev_err(netdev, "No memory left for URBs\n"); 727 stats->tx_dropped++; 728 dev_kfree_skb(skb); 729 goto nourbmem; 730 } 731 732 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, 733 &urb->transfer_dma); 734 if (!buf) { 735 netdev_err(netdev, "No memory left for USB buffer\n"); 736 stats->tx_dropped++; 737 dev_kfree_skb(skb); 738 goto nobufmem; 739 } 740 741 msg = (struct esd_usb2_msg *)buf; 742 743 msg->msg.hdr.len = 3; /* minimal length */ 744 msg->msg.hdr.cmd = CMD_CAN_TX; 745 msg->msg.tx.net = priv->index; 746 msg->msg.tx.dlc = cf->can_dlc; 747 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); 748 749 if (cf->can_id & CAN_RTR_FLAG) 750 msg->msg.tx.dlc |= ESD_RTR; 751 752 if (cf->can_id & CAN_EFF_FLAG) 753 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID); 754 755 for (i = 0; i < cf->can_dlc; i++) 756 msg->msg.tx.data[i] = cf->data[i]; 757 758 msg->msg.hdr.len += (cf->can_dlc + 3) >> 2; 759 760 for (i = 0; i < MAX_TX_URBS; i++) { 761 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { 762 context = &priv->tx_contexts[i]; 763 break; 764 } 765 } 766 767 /* 768 * This may never happen. 769 */ 770 if (!context) { 771 netdev_warn(netdev, "couldn't find free context\n"); 772 ret = NETDEV_TX_BUSY; 773 goto releasebuf; 774 } 775 776 context->priv = priv; 777 context->echo_index = i; 778 context->dlc = cf->can_dlc; 779 780 /* hnd must not be 0 - MSB is stripped in txdone handling */ 781 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */ 782 783 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, 784 msg->msg.hdr.len << 2, 785 esd_usb2_write_bulk_callback, context); 786 787 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 788 789 usb_anchor_urb(urb, &priv->tx_submitted); 790 791 can_put_echo_skb(skb, netdev, context->echo_index); 792 793 atomic_inc(&priv->active_tx_jobs); 794 795 /* Slow down tx path */ 796 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS) 797 netif_stop_queue(netdev); 798 799 err = usb_submit_urb(urb, GFP_ATOMIC); 800 if (err) { 801 can_free_echo_skb(netdev, context->echo_index); 802 803 atomic_dec(&priv->active_tx_jobs); 804 usb_unanchor_urb(urb); 805 806 stats->tx_dropped++; 807 808 if (err == -ENODEV) 809 netif_device_detach(netdev); 810 else 811 netdev_warn(netdev, "failed tx_urb %d\n", err); 812 813 goto releasebuf; 814 } 815 816 netdev->trans_start = jiffies; 817 818 /* 819 * Release our reference to this URB, the USB core will eventually free 820 * it entirely. 821 */ 822 usb_free_urb(urb); 823 824 return NETDEV_TX_OK; 825 826releasebuf: 827 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); 828 829nobufmem: 830 usb_free_urb(urb); 831 832nourbmem: 833 return ret; 834} 835 836static int esd_usb2_close(struct net_device *netdev) 837{ 838 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 839 struct esd_usb2_msg msg; 840 int i; 841 842 /* Disable all IDs (see esd_usb2_start()) */ 843 msg.msg.hdr.cmd = CMD_IDADD; 844 msg.msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 845 msg.msg.filter.net = priv->index; 846 msg.msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 847 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++) 848 msg.msg.filter.mask[i] = 0; 849 if (esd_usb2_send_msg(priv->usb2, &msg) < 0) 850 netdev_err(netdev, "sending idadd message failed\n"); 851 852 /* set CAN controller to reset mode */ 853 msg.msg.hdr.len = 2; 854 msg.msg.hdr.cmd = CMD_SETBAUD; 855 msg.msg.setbaud.net = priv->index; 856 msg.msg.setbaud.rsvd = 0; 857 msg.msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE); 858 if (esd_usb2_send_msg(priv->usb2, &msg) < 0) 859 netdev_err(netdev, "sending setbaud message failed\n"); 860 861 priv->can.state = CAN_STATE_STOPPED; 862 863 netif_stop_queue(netdev); 864 865 close_candev(netdev); 866 867 priv->open_time = 0; 868 869 return 0; 870} 871 872static const struct net_device_ops esd_usb2_netdev_ops = { 873 .ndo_open = esd_usb2_open, 874 .ndo_stop = esd_usb2_close, 875 .ndo_start_xmit = esd_usb2_start_xmit, 876}; 877 878static const struct can_bittiming_const esd_usb2_bittiming_const = { 879 .name = "esd_usb2", 880 .tseg1_min = ESD_USB2_TSEG1_MIN, 881 .tseg1_max = ESD_USB2_TSEG1_MAX, 882 .tseg2_min = ESD_USB2_TSEG2_MIN, 883 .tseg2_max = ESD_USB2_TSEG2_MAX, 884 .sjw_max = ESD_USB2_SJW_MAX, 885 .brp_min = ESD_USB2_BRP_MIN, 886 .brp_max = ESD_USB2_BRP_MAX, 887 .brp_inc = ESD_USB2_BRP_INC, 888}; 889 890static int esd_usb2_set_bittiming(struct net_device *netdev) 891{ 892 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 893 struct can_bittiming *bt = &priv->can.bittiming; 894 struct esd_usb2_msg msg; 895 u32 canbtr; 896 int sjw_shift; 897 898 canbtr = ESD_USB2_UBR; 899 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) 900 canbtr |= ESD_USB2_LOM; 901 902 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1); 903 904 if (le16_to_cpu(priv->usb2->udev->descriptor.idProduct) == 905 USB_CANUSBM_PRODUCT_ID) 906 sjw_shift = ESD_USBM_SJW_SHIFT; 907 else 908 sjw_shift = ESD_USB2_SJW_SHIFT; 909 910 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1)) 911 << sjw_shift; 912 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1) 913 & (ESD_USB2_TSEG1_MAX - 1)) 914 << ESD_USB2_TSEG1_SHIFT; 915 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1)) 916 << ESD_USB2_TSEG2_SHIFT; 917 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 918 canbtr |= ESD_USB2_3_SAMPLES; 919 920 msg.msg.hdr.len = 2; 921 msg.msg.hdr.cmd = CMD_SETBAUD; 922 msg.msg.setbaud.net = priv->index; 923 msg.msg.setbaud.rsvd = 0; 924 msg.msg.setbaud.baud = cpu_to_le32(canbtr); 925 926 netdev_info(netdev, "setting BTR=%#x\n", canbtr); 927 928 return esd_usb2_send_msg(priv->usb2, &msg); 929} 930 931static int esd_usb2_get_berr_counter(const struct net_device *netdev, 932 struct can_berr_counter *bec) 933{ 934 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 935 936 bec->txerr = priv->bec.txerr; 937 bec->rxerr = priv->bec.rxerr; 938 939 return 0; 940} 941 942static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode) 943{ 944 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 945 946 if (!priv->open_time) 947 return -EINVAL; 948 949 switch (mode) { 950 case CAN_MODE_START: 951 netif_wake_queue(netdev); 952 break; 953 954 default: 955 return -EOPNOTSUPP; 956 } 957 958 return 0; 959} 960 961static int esd_usb2_probe_one_net(struct usb_interface *intf, int index) 962{ 963 struct esd_usb2 *dev = usb_get_intfdata(intf); 964 struct net_device *netdev; 965 struct esd_usb2_net_priv *priv; 966 int err = 0; 967 int i; 968 969 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS); 970 if (!netdev) { 971 dev_err(&intf->dev, "couldn't alloc candev\n"); 972 err = -ENOMEM; 973 goto done; 974 } 975 976 priv = netdev_priv(netdev); 977 978 init_usb_anchor(&priv->tx_submitted); 979 atomic_set(&priv->active_tx_jobs, 0); 980 981 for (i = 0; i < MAX_TX_URBS; i++) 982 priv->tx_contexts[i].echo_index = MAX_TX_URBS; 983 984 priv->usb2 = dev; 985 priv->netdev = netdev; 986 priv->index = index; 987 988 priv->can.state = CAN_STATE_STOPPED; 989 priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY; 990 991 if (le16_to_cpu(dev->udev->descriptor.idProduct) == 992 USB_CANUSBM_PRODUCT_ID) 993 priv->can.clock.freq = ESD_USBM_CAN_CLOCK; 994 else { 995 priv->can.clock.freq = ESD_USB2_CAN_CLOCK; 996 priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES; 997 } 998 999 priv->can.bittiming_const = &esd_usb2_bittiming_const; 1000 priv->can.do_set_bittiming = esd_usb2_set_bittiming; 1001 priv->can.do_set_mode = esd_usb2_set_mode; 1002 priv->can.do_get_berr_counter = esd_usb2_get_berr_counter; 1003 1004 netdev->flags |= IFF_ECHO; /* we support local echo */ 1005 1006 netdev->netdev_ops = &esd_usb2_netdev_ops; 1007 1008 SET_NETDEV_DEV(netdev, &intf->dev); 1009 1010 err = register_candev(netdev); 1011 if (err) { 1012 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err); 1013 free_candev(netdev); 1014 err = -ENOMEM; 1015 goto done; 1016 } 1017 1018 dev->nets[index] = priv; 1019 netdev_info(netdev, "device %s registered\n", netdev->name); 1020 1021done: 1022 return err; 1023} 1024 1025/* 1026 * probe function for new USB2 devices 1027 * 1028 * check version information and number of available 1029 * CAN interfaces 1030 */ 1031static int esd_usb2_probe(struct usb_interface *intf, 1032 const struct usb_device_id *id) 1033{ 1034 struct esd_usb2 *dev; 1035 struct esd_usb2_msg msg; 1036 int i, err; 1037 1038 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 1039 if (!dev) { 1040 err = -ENOMEM; 1041 goto done; 1042 } 1043 1044 dev->udev = interface_to_usbdev(intf); 1045 1046 init_usb_anchor(&dev->rx_submitted); 1047 1048 usb_set_intfdata(intf, dev); 1049 1050 /* query number of CAN interfaces (nets) */ 1051 msg.msg.hdr.cmd = CMD_VERSION; 1052 msg.msg.hdr.len = 2; 1053 msg.msg.version.rsvd = 0; 1054 msg.msg.version.flags = 0; 1055 msg.msg.version.drv_version = 0; 1056 1057 err = esd_usb2_send_msg(dev, &msg); 1058 if (err < 0) { 1059 dev_err(&intf->dev, "sending version message failed\n"); 1060 goto free_dev; 1061 } 1062 1063 err = esd_usb2_wait_msg(dev, &msg); 1064 if (err < 0) { 1065 dev_err(&intf->dev, "no version message answer\n"); 1066 goto free_dev; 1067 } 1068 1069 dev->net_count = (int)msg.msg.version_reply.nets; 1070 dev->version = le32_to_cpu(msg.msg.version_reply.version); 1071 1072 if (device_create_file(&intf->dev, &dev_attr_firmware)) 1073 dev_err(&intf->dev, 1074 "Couldn't create device file for firmware\n"); 1075 1076 if (device_create_file(&intf->dev, &dev_attr_hardware)) 1077 dev_err(&intf->dev, 1078 "Couldn't create device file for hardware\n"); 1079 1080 if (device_create_file(&intf->dev, &dev_attr_nets)) 1081 dev_err(&intf->dev, 1082 "Couldn't create device file for nets\n"); 1083 1084 /* do per device probing */ 1085 for (i = 0; i < dev->net_count; i++) 1086 esd_usb2_probe_one_net(intf, i); 1087 1088 return 0; 1089 1090free_dev: 1091 kfree(dev); 1092done: 1093 return err; 1094} 1095 1096/* 1097 * called by the usb core when the device is removed from the system 1098 */ 1099static void esd_usb2_disconnect(struct usb_interface *intf) 1100{ 1101 struct esd_usb2 *dev = usb_get_intfdata(intf); 1102 struct net_device *netdev; 1103 int i; 1104 1105 device_remove_file(&intf->dev, &dev_attr_firmware); 1106 device_remove_file(&intf->dev, &dev_attr_hardware); 1107 device_remove_file(&intf->dev, &dev_attr_nets); 1108 1109 usb_set_intfdata(intf, NULL); 1110 1111 if (dev) { 1112 for (i = 0; i < dev->net_count; i++) { 1113 if (dev->nets[i]) { 1114 netdev = dev->nets[i]->netdev; 1115 unregister_netdev(netdev); 1116 free_candev(netdev); 1117 } 1118 } 1119 unlink_all_urbs(dev); 1120 } 1121} 1122 1123/* usb specific object needed to register this driver with the usb subsystem */ 1124static struct usb_driver esd_usb2_driver = { 1125 .name = "esd_usb2", 1126 .probe = esd_usb2_probe, 1127 .disconnect = esd_usb2_disconnect, 1128 .id_table = esd_usb2_table, 1129}; 1130 1131module_usb_driver(esd_usb2_driver); 1132