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 __le32 hnd; 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 __le32 hnd; 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 can_bus_off(priv->netdev); 254 break; 255 case ESD_BUSSTATE_WARN: 256 priv->can.state = CAN_STATE_ERROR_WARNING; 257 priv->can.can_stats.error_warning++; 258 break; 259 case ESD_BUSSTATE_ERRPASSIVE: 260 priv->can.state = CAN_STATE_ERROR_PASSIVE; 261 priv->can.can_stats.error_passive++; 262 break; 263 default: 264 priv->can.state = CAN_STATE_ERROR_ACTIVE; 265 break; 266 } 267 } else { 268 priv->can.can_stats.bus_error++; 269 stats->rx_errors++; 270 271 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 272 273 switch (ecc & SJA1000_ECC_MASK) { 274 case SJA1000_ECC_BIT: 275 cf->data[2] |= CAN_ERR_PROT_BIT; 276 break; 277 case SJA1000_ECC_FORM: 278 cf->data[2] |= CAN_ERR_PROT_FORM; 279 break; 280 case SJA1000_ECC_STUFF: 281 cf->data[2] |= CAN_ERR_PROT_STUFF; 282 break; 283 default: 284 cf->data[2] |= CAN_ERR_PROT_UNSPEC; 285 cf->data[3] = ecc & SJA1000_ECC_SEG; 286 break; 287 } 288 289 /* Error occurred during transmission? */ 290 if (!(ecc & SJA1000_ECC_DIR)) 291 cf->data[2] |= CAN_ERR_PROT_TX; 292 293 if (priv->can.state == CAN_STATE_ERROR_WARNING || 294 priv->can.state == CAN_STATE_ERROR_PASSIVE) { 295 cf->data[1] = (txerr > rxerr) ? 296 CAN_ERR_CRTL_TX_PASSIVE : 297 CAN_ERR_CRTL_RX_PASSIVE; 298 } 299 cf->data[6] = txerr; 300 cf->data[7] = rxerr; 301 } 302 303 netif_rx(skb); 304 305 priv->bec.txerr = txerr; 306 priv->bec.rxerr = rxerr; 307 308 stats->rx_packets++; 309 stats->rx_bytes += cf->can_dlc; 310 } 311} 312 313static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv, 314 struct esd_usb2_msg *msg) 315{ 316 struct net_device_stats *stats = &priv->netdev->stats; 317 struct can_frame *cf; 318 struct sk_buff *skb; 319 int i; 320 u32 id; 321 322 if (!netif_device_present(priv->netdev)) 323 return; 324 325 id = le32_to_cpu(msg->msg.rx.id); 326 327 if (id & ESD_EVENT) { 328 esd_usb2_rx_event(priv, msg); 329 } else { 330 skb = alloc_can_skb(priv->netdev, &cf); 331 if (skb == NULL) { 332 stats->rx_dropped++; 333 return; 334 } 335 336 cf->can_id = id & ESD_IDMASK; 337 cf->can_dlc = get_can_dlc(msg->msg.rx.dlc); 338 339 if (id & ESD_EXTID) 340 cf->can_id |= CAN_EFF_FLAG; 341 342 if (msg->msg.rx.dlc & ESD_RTR) { 343 cf->can_id |= CAN_RTR_FLAG; 344 } else { 345 for (i = 0; i < cf->can_dlc; i++) 346 cf->data[i] = msg->msg.rx.data[i]; 347 } 348 349 netif_rx(skb); 350 351 stats->rx_packets++; 352 stats->rx_bytes += cf->can_dlc; 353 } 354 355 return; 356} 357 358static void esd_usb2_tx_done_msg(struct esd_usb2_net_priv *priv, 359 struct esd_usb2_msg *msg) 360{ 361 struct net_device_stats *stats = &priv->netdev->stats; 362 struct net_device *netdev = priv->netdev; 363 struct esd_tx_urb_context *context; 364 365 if (!netif_device_present(netdev)) 366 return; 367 368 context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)]; 369 370 if (!msg->msg.txdone.status) { 371 stats->tx_packets++; 372 stats->tx_bytes += context->dlc; 373 can_get_echo_skb(netdev, context->echo_index); 374 } else { 375 stats->tx_errors++; 376 can_free_echo_skb(netdev, context->echo_index); 377 } 378 379 /* Release context */ 380 context->echo_index = MAX_TX_URBS; 381 atomic_dec(&priv->active_tx_jobs); 382 383 netif_wake_queue(netdev); 384} 385 386static void esd_usb2_read_bulk_callback(struct urb *urb) 387{ 388 struct esd_usb2 *dev = urb->context; 389 int retval; 390 int pos = 0; 391 int i; 392 393 switch (urb->status) { 394 case 0: /* success */ 395 break; 396 397 case -ENOENT: 398 case -ESHUTDOWN: 399 return; 400 401 default: 402 dev_info(dev->udev->dev.parent, 403 "Rx URB aborted (%d)\n", urb->status); 404 goto resubmit_urb; 405 } 406 407 while (pos < urb->actual_length) { 408 struct esd_usb2_msg *msg; 409 410 msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos); 411 412 switch (msg->msg.hdr.cmd) { 413 case CMD_CAN_RX: 414 if (msg->msg.rx.net >= dev->net_count) { 415 dev_err(dev->udev->dev.parent, "format error\n"); 416 break; 417 } 418 419 esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg); 420 break; 421 422 case CMD_CAN_TX: 423 if (msg->msg.txdone.net >= dev->net_count) { 424 dev_err(dev->udev->dev.parent, "format error\n"); 425 break; 426 } 427 428 esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net], 429 msg); 430 break; 431 } 432 433 pos += msg->msg.hdr.len << 2; 434 435 if (pos > urb->actual_length) { 436 dev_err(dev->udev->dev.parent, "format error\n"); 437 break; 438 } 439 } 440 441resubmit_urb: 442 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1), 443 urb->transfer_buffer, RX_BUFFER_SIZE, 444 esd_usb2_read_bulk_callback, dev); 445 446 retval = usb_submit_urb(urb, GFP_ATOMIC); 447 if (retval == -ENODEV) { 448 for (i = 0; i < dev->net_count; i++) { 449 if (dev->nets[i]) 450 netif_device_detach(dev->nets[i]->netdev); 451 } 452 } else if (retval) { 453 dev_err(dev->udev->dev.parent, 454 "failed resubmitting read bulk urb: %d\n", retval); 455 } 456 457 return; 458} 459 460/* 461 * callback for bulk IN urb 462 */ 463static void esd_usb2_write_bulk_callback(struct urb *urb) 464{ 465 struct esd_tx_urb_context *context = urb->context; 466 struct esd_usb2_net_priv *priv; 467 struct net_device *netdev; 468 size_t size = sizeof(struct esd_usb2_msg); 469 470 WARN_ON(!context); 471 472 priv = context->priv; 473 netdev = priv->netdev; 474 475 /* free up our allocated buffer */ 476 usb_free_coherent(urb->dev, size, 477 urb->transfer_buffer, urb->transfer_dma); 478 479 if (!netif_device_present(netdev)) 480 return; 481 482 if (urb->status) 483 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status); 484 485 netdev->trans_start = jiffies; 486} 487 488static ssize_t show_firmware(struct device *d, 489 struct device_attribute *attr, char *buf) 490{ 491 struct usb_interface *intf = to_usb_interface(d); 492 struct esd_usb2 *dev = usb_get_intfdata(intf); 493 494 return sprintf(buf, "%d.%d.%d\n", 495 (dev->version >> 12) & 0xf, 496 (dev->version >> 8) & 0xf, 497 dev->version & 0xff); 498} 499static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL); 500 501static ssize_t show_hardware(struct device *d, 502 struct device_attribute *attr, char *buf) 503{ 504 struct usb_interface *intf = to_usb_interface(d); 505 struct esd_usb2 *dev = usb_get_intfdata(intf); 506 507 return sprintf(buf, "%d.%d.%d\n", 508 (dev->version >> 28) & 0xf, 509 (dev->version >> 24) & 0xf, 510 (dev->version >> 16) & 0xff); 511} 512static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL); 513 514static ssize_t show_nets(struct device *d, 515 struct device_attribute *attr, char *buf) 516{ 517 struct usb_interface *intf = to_usb_interface(d); 518 struct esd_usb2 *dev = usb_get_intfdata(intf); 519 520 return sprintf(buf, "%d", dev->net_count); 521} 522static DEVICE_ATTR(nets, S_IRUGO, show_nets, NULL); 523 524static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg) 525{ 526 int actual_length; 527 528 return usb_bulk_msg(dev->udev, 529 usb_sndbulkpipe(dev->udev, 2), 530 msg, 531 msg->msg.hdr.len << 2, 532 &actual_length, 533 1000); 534} 535 536static int esd_usb2_wait_msg(struct esd_usb2 *dev, 537 struct esd_usb2_msg *msg) 538{ 539 int actual_length; 540 541 return usb_bulk_msg(dev->udev, 542 usb_rcvbulkpipe(dev->udev, 1), 543 msg, 544 sizeof(*msg), 545 &actual_length, 546 1000); 547} 548 549static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev) 550{ 551 int i, err = 0; 552 553 if (dev->rxinitdone) 554 return 0; 555 556 for (i = 0; i < MAX_RX_URBS; i++) { 557 struct urb *urb = NULL; 558 u8 *buf = NULL; 559 560 /* create a URB, and a buffer for it */ 561 urb = usb_alloc_urb(0, GFP_KERNEL); 562 if (!urb) { 563 dev_warn(dev->udev->dev.parent, 564 "No memory left for URBs\n"); 565 err = -ENOMEM; 566 break; 567 } 568 569 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, 570 &urb->transfer_dma); 571 if (!buf) { 572 dev_warn(dev->udev->dev.parent, 573 "No memory left for USB buffer\n"); 574 err = -ENOMEM; 575 goto freeurb; 576 } 577 578 usb_fill_bulk_urb(urb, dev->udev, 579 usb_rcvbulkpipe(dev->udev, 1), 580 buf, RX_BUFFER_SIZE, 581 esd_usb2_read_bulk_callback, dev); 582 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 583 usb_anchor_urb(urb, &dev->rx_submitted); 584 585 err = usb_submit_urb(urb, GFP_KERNEL); 586 if (err) { 587 usb_unanchor_urb(urb); 588 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, 589 urb->transfer_dma); 590 } 591 592freeurb: 593 /* Drop reference, USB core will take care of freeing it */ 594 usb_free_urb(urb); 595 if (err) 596 break; 597 } 598 599 /* Did we submit any URBs */ 600 if (i == 0) { 601 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n"); 602 return err; 603 } 604 605 /* Warn if we've couldn't transmit all the URBs */ 606 if (i < MAX_RX_URBS) { 607 dev_warn(dev->udev->dev.parent, 608 "rx performance may be slow\n"); 609 } 610 611 dev->rxinitdone = 1; 612 return 0; 613} 614 615/* 616 * Start interface 617 */ 618static int esd_usb2_start(struct esd_usb2_net_priv *priv) 619{ 620 struct esd_usb2 *dev = priv->usb2; 621 struct net_device *netdev = priv->netdev; 622 struct esd_usb2_msg *msg; 623 int err, i; 624 625 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 626 if (!msg) { 627 err = -ENOMEM; 628 goto out; 629 } 630 631 /* 632 * Enable all IDs 633 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits). 634 * Each bit represents one 11 bit CAN identifier. A set bit 635 * enables reception of the corresponding CAN identifier. A cleared 636 * bit disabled this identifier. An additional bitmask value 637 * following the CAN 2.0A bits is used to enable reception of 638 * extended CAN frames. Only the LSB of this final mask is checked 639 * for the complete 29 bit ID range. The IDADD message also allows 640 * filter configuration for an ID subset. In this case you can add 641 * the number of the starting bitmask (0..64) to the filter.option 642 * field followed by only some bitmasks. 643 */ 644 msg->msg.hdr.cmd = CMD_IDADD; 645 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 646 msg->msg.filter.net = priv->index; 647 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 648 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++) 649 msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff); 650 /* enable 29bit extended IDs */ 651 msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001); 652 653 err = esd_usb2_send_msg(dev, msg); 654 if (err) 655 goto out; 656 657 err = esd_usb2_setup_rx_urbs(dev); 658 if (err) 659 goto out; 660 661 priv->can.state = CAN_STATE_ERROR_ACTIVE; 662 663out: 664 if (err == -ENODEV) 665 netif_device_detach(netdev); 666 if (err) 667 netdev_err(netdev, "couldn't start device: %d\n", err); 668 669 kfree(msg); 670 return err; 671} 672 673static void unlink_all_urbs(struct esd_usb2 *dev) 674{ 675 struct esd_usb2_net_priv *priv; 676 int i, j; 677 678 usb_kill_anchored_urbs(&dev->rx_submitted); 679 for (i = 0; i < dev->net_count; i++) { 680 priv = dev->nets[i]; 681 if (priv) { 682 usb_kill_anchored_urbs(&priv->tx_submitted); 683 atomic_set(&priv->active_tx_jobs, 0); 684 685 for (j = 0; j < MAX_TX_URBS; j++) 686 priv->tx_contexts[j].echo_index = MAX_TX_URBS; 687 } 688 } 689} 690 691static int esd_usb2_open(struct net_device *netdev) 692{ 693 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 694 int err; 695 696 /* common open */ 697 err = open_candev(netdev); 698 if (err) 699 return err; 700 701 /* finally start device */ 702 err = esd_usb2_start(priv); 703 if (err) { 704 netdev_warn(netdev, "couldn't start device: %d\n", err); 705 close_candev(netdev); 706 return err; 707 } 708 709 netif_start_queue(netdev); 710 711 return 0; 712} 713 714static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb, 715 struct net_device *netdev) 716{ 717 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 718 struct esd_usb2 *dev = priv->usb2; 719 struct esd_tx_urb_context *context = NULL; 720 struct net_device_stats *stats = &netdev->stats; 721 struct can_frame *cf = (struct can_frame *)skb->data; 722 struct esd_usb2_msg *msg; 723 struct urb *urb; 724 u8 *buf; 725 int i, err; 726 int ret = NETDEV_TX_OK; 727 size_t size = sizeof(struct esd_usb2_msg); 728 729 if (can_dropped_invalid_skb(netdev, skb)) 730 return NETDEV_TX_OK; 731 732 /* create a URB, and a buffer for it, and copy the data to the URB */ 733 urb = usb_alloc_urb(0, GFP_ATOMIC); 734 if (!urb) { 735 netdev_err(netdev, "No memory left for URBs\n"); 736 stats->tx_dropped++; 737 dev_kfree_skb(skb); 738 goto nourbmem; 739 } 740 741 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, 742 &urb->transfer_dma); 743 if (!buf) { 744 netdev_err(netdev, "No memory left for USB buffer\n"); 745 stats->tx_dropped++; 746 dev_kfree_skb(skb); 747 goto nobufmem; 748 } 749 750 msg = (struct esd_usb2_msg *)buf; 751 752 msg->msg.hdr.len = 3; /* minimal length */ 753 msg->msg.hdr.cmd = CMD_CAN_TX; 754 msg->msg.tx.net = priv->index; 755 msg->msg.tx.dlc = cf->can_dlc; 756 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); 757 758 if (cf->can_id & CAN_RTR_FLAG) 759 msg->msg.tx.dlc |= ESD_RTR; 760 761 if (cf->can_id & CAN_EFF_FLAG) 762 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID); 763 764 for (i = 0; i < cf->can_dlc; i++) 765 msg->msg.tx.data[i] = cf->data[i]; 766 767 msg->msg.hdr.len += (cf->can_dlc + 3) >> 2; 768 769 for (i = 0; i < MAX_TX_URBS; i++) { 770 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { 771 context = &priv->tx_contexts[i]; 772 break; 773 } 774 } 775 776 /* 777 * This may never happen. 778 */ 779 if (!context) { 780 netdev_warn(netdev, "couldn't find free context\n"); 781 ret = NETDEV_TX_BUSY; 782 goto releasebuf; 783 } 784 785 context->priv = priv; 786 context->echo_index = i; 787 context->dlc = cf->can_dlc; 788 789 /* hnd must not be 0 - MSB is stripped in txdone handling */ 790 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */ 791 792 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, 793 msg->msg.hdr.len << 2, 794 esd_usb2_write_bulk_callback, context); 795 796 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 797 798 usb_anchor_urb(urb, &priv->tx_submitted); 799 800 can_put_echo_skb(skb, netdev, context->echo_index); 801 802 atomic_inc(&priv->active_tx_jobs); 803 804 /* Slow down tx path */ 805 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS) 806 netif_stop_queue(netdev); 807 808 err = usb_submit_urb(urb, GFP_ATOMIC); 809 if (err) { 810 can_free_echo_skb(netdev, context->echo_index); 811 812 atomic_dec(&priv->active_tx_jobs); 813 usb_unanchor_urb(urb); 814 815 stats->tx_dropped++; 816 817 if (err == -ENODEV) 818 netif_device_detach(netdev); 819 else 820 netdev_warn(netdev, "failed tx_urb %d\n", err); 821 822 goto releasebuf; 823 } 824 825 netdev->trans_start = jiffies; 826 827 /* 828 * Release our reference to this URB, the USB core will eventually free 829 * it entirely. 830 */ 831 usb_free_urb(urb); 832 833 return NETDEV_TX_OK; 834 835releasebuf: 836 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); 837 838nobufmem: 839 usb_free_urb(urb); 840 841nourbmem: 842 return ret; 843} 844 845static int esd_usb2_close(struct net_device *netdev) 846{ 847 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 848 struct esd_usb2_msg *msg; 849 int i; 850 851 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 852 if (!msg) 853 return -ENOMEM; 854 855 /* Disable all IDs (see esd_usb2_start()) */ 856 msg->msg.hdr.cmd = CMD_IDADD; 857 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 858 msg->msg.filter.net = priv->index; 859 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 860 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++) 861 msg->msg.filter.mask[i] = 0; 862 if (esd_usb2_send_msg(priv->usb2, msg) < 0) 863 netdev_err(netdev, "sending idadd message failed\n"); 864 865 /* set CAN controller to reset mode */ 866 msg->msg.hdr.len = 2; 867 msg->msg.hdr.cmd = CMD_SETBAUD; 868 msg->msg.setbaud.net = priv->index; 869 msg->msg.setbaud.rsvd = 0; 870 msg->msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE); 871 if (esd_usb2_send_msg(priv->usb2, msg) < 0) 872 netdev_err(netdev, "sending setbaud message failed\n"); 873 874 priv->can.state = CAN_STATE_STOPPED; 875 876 netif_stop_queue(netdev); 877 878 close_candev(netdev); 879 880 kfree(msg); 881 882 return 0; 883} 884 885static const struct net_device_ops esd_usb2_netdev_ops = { 886 .ndo_open = esd_usb2_open, 887 .ndo_stop = esd_usb2_close, 888 .ndo_start_xmit = esd_usb2_start_xmit, 889 .ndo_change_mtu = can_change_mtu, 890}; 891 892static const struct can_bittiming_const esd_usb2_bittiming_const = { 893 .name = "esd_usb2", 894 .tseg1_min = ESD_USB2_TSEG1_MIN, 895 .tseg1_max = ESD_USB2_TSEG1_MAX, 896 .tseg2_min = ESD_USB2_TSEG2_MIN, 897 .tseg2_max = ESD_USB2_TSEG2_MAX, 898 .sjw_max = ESD_USB2_SJW_MAX, 899 .brp_min = ESD_USB2_BRP_MIN, 900 .brp_max = ESD_USB2_BRP_MAX, 901 .brp_inc = ESD_USB2_BRP_INC, 902}; 903 904static int esd_usb2_set_bittiming(struct net_device *netdev) 905{ 906 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 907 struct can_bittiming *bt = &priv->can.bittiming; 908 struct esd_usb2_msg *msg; 909 int err; 910 u32 canbtr; 911 int sjw_shift; 912 913 canbtr = ESD_USB2_UBR; 914 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) 915 canbtr |= ESD_USB2_LOM; 916 917 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1); 918 919 if (le16_to_cpu(priv->usb2->udev->descriptor.idProduct) == 920 USB_CANUSBM_PRODUCT_ID) 921 sjw_shift = ESD_USBM_SJW_SHIFT; 922 else 923 sjw_shift = ESD_USB2_SJW_SHIFT; 924 925 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1)) 926 << sjw_shift; 927 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1) 928 & (ESD_USB2_TSEG1_MAX - 1)) 929 << ESD_USB2_TSEG1_SHIFT; 930 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1)) 931 << ESD_USB2_TSEG2_SHIFT; 932 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 933 canbtr |= ESD_USB2_3_SAMPLES; 934 935 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 936 if (!msg) 937 return -ENOMEM; 938 939 msg->msg.hdr.len = 2; 940 msg->msg.hdr.cmd = CMD_SETBAUD; 941 msg->msg.setbaud.net = priv->index; 942 msg->msg.setbaud.rsvd = 0; 943 msg->msg.setbaud.baud = cpu_to_le32(canbtr); 944 945 netdev_info(netdev, "setting BTR=%#x\n", canbtr); 946 947 err = esd_usb2_send_msg(priv->usb2, msg); 948 949 kfree(msg); 950 return err; 951} 952 953static int esd_usb2_get_berr_counter(const struct net_device *netdev, 954 struct can_berr_counter *bec) 955{ 956 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 957 958 bec->txerr = priv->bec.txerr; 959 bec->rxerr = priv->bec.rxerr; 960 961 return 0; 962} 963 964static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode) 965{ 966 switch (mode) { 967 case CAN_MODE_START: 968 netif_wake_queue(netdev); 969 break; 970 971 default: 972 return -EOPNOTSUPP; 973 } 974 975 return 0; 976} 977 978static int esd_usb2_probe_one_net(struct usb_interface *intf, int index) 979{ 980 struct esd_usb2 *dev = usb_get_intfdata(intf); 981 struct net_device *netdev; 982 struct esd_usb2_net_priv *priv; 983 int err = 0; 984 int i; 985 986 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS); 987 if (!netdev) { 988 dev_err(&intf->dev, "couldn't alloc candev\n"); 989 err = -ENOMEM; 990 goto done; 991 } 992 993 priv = netdev_priv(netdev); 994 995 init_usb_anchor(&priv->tx_submitted); 996 atomic_set(&priv->active_tx_jobs, 0); 997 998 for (i = 0; i < MAX_TX_URBS; i++) 999 priv->tx_contexts[i].echo_index = MAX_TX_URBS; 1000 1001 priv->usb2 = dev; 1002 priv->netdev = netdev; 1003 priv->index = index; 1004 1005 priv->can.state = CAN_STATE_STOPPED; 1006 priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY; 1007 1008 if (le16_to_cpu(dev->udev->descriptor.idProduct) == 1009 USB_CANUSBM_PRODUCT_ID) 1010 priv->can.clock.freq = ESD_USBM_CAN_CLOCK; 1011 else { 1012 priv->can.clock.freq = ESD_USB2_CAN_CLOCK; 1013 priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES; 1014 } 1015 1016 priv->can.bittiming_const = &esd_usb2_bittiming_const; 1017 priv->can.do_set_bittiming = esd_usb2_set_bittiming; 1018 priv->can.do_set_mode = esd_usb2_set_mode; 1019 priv->can.do_get_berr_counter = esd_usb2_get_berr_counter; 1020 1021 netdev->flags |= IFF_ECHO; /* we support local echo */ 1022 1023 netdev->netdev_ops = &esd_usb2_netdev_ops; 1024 1025 SET_NETDEV_DEV(netdev, &intf->dev); 1026 netdev->dev_id = index; 1027 1028 err = register_candev(netdev); 1029 if (err) { 1030 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err); 1031 free_candev(netdev); 1032 err = -ENOMEM; 1033 goto done; 1034 } 1035 1036 dev->nets[index] = priv; 1037 netdev_info(netdev, "device %s registered\n", netdev->name); 1038 1039done: 1040 return err; 1041} 1042 1043/* 1044 * probe function for new USB2 devices 1045 * 1046 * check version information and number of available 1047 * CAN interfaces 1048 */ 1049static int esd_usb2_probe(struct usb_interface *intf, 1050 const struct usb_device_id *id) 1051{ 1052 struct esd_usb2 *dev; 1053 struct esd_usb2_msg *msg; 1054 int i, err; 1055 1056 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 1057 if (!dev) { 1058 err = -ENOMEM; 1059 goto done; 1060 } 1061 1062 dev->udev = interface_to_usbdev(intf); 1063 1064 init_usb_anchor(&dev->rx_submitted); 1065 1066 usb_set_intfdata(intf, dev); 1067 1068 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 1069 if (!msg) { 1070 err = -ENOMEM; 1071 goto free_msg; 1072 } 1073 1074 /* query number of CAN interfaces (nets) */ 1075 msg->msg.hdr.cmd = CMD_VERSION; 1076 msg->msg.hdr.len = 2; 1077 msg->msg.version.rsvd = 0; 1078 msg->msg.version.flags = 0; 1079 msg->msg.version.drv_version = 0; 1080 1081 err = esd_usb2_send_msg(dev, msg); 1082 if (err < 0) { 1083 dev_err(&intf->dev, "sending version message failed\n"); 1084 goto free_msg; 1085 } 1086 1087 err = esd_usb2_wait_msg(dev, msg); 1088 if (err < 0) { 1089 dev_err(&intf->dev, "no version message answer\n"); 1090 goto free_msg; 1091 } 1092 1093 dev->net_count = (int)msg->msg.version_reply.nets; 1094 dev->version = le32_to_cpu(msg->msg.version_reply.version); 1095 1096 if (device_create_file(&intf->dev, &dev_attr_firmware)) 1097 dev_err(&intf->dev, 1098 "Couldn't create device file for firmware\n"); 1099 1100 if (device_create_file(&intf->dev, &dev_attr_hardware)) 1101 dev_err(&intf->dev, 1102 "Couldn't create device file for hardware\n"); 1103 1104 if (device_create_file(&intf->dev, &dev_attr_nets)) 1105 dev_err(&intf->dev, 1106 "Couldn't create device file for nets\n"); 1107 1108 /* do per device probing */ 1109 for (i = 0; i < dev->net_count; i++) 1110 esd_usb2_probe_one_net(intf, i); 1111 1112free_msg: 1113 kfree(msg); 1114 if (err) 1115 kfree(dev); 1116done: 1117 return err; 1118} 1119 1120/* 1121 * called by the usb core when the device is removed from the system 1122 */ 1123static void esd_usb2_disconnect(struct usb_interface *intf) 1124{ 1125 struct esd_usb2 *dev = usb_get_intfdata(intf); 1126 struct net_device *netdev; 1127 int i; 1128 1129 device_remove_file(&intf->dev, &dev_attr_firmware); 1130 device_remove_file(&intf->dev, &dev_attr_hardware); 1131 device_remove_file(&intf->dev, &dev_attr_nets); 1132 1133 usb_set_intfdata(intf, NULL); 1134 1135 if (dev) { 1136 for (i = 0; i < dev->net_count; i++) { 1137 if (dev->nets[i]) { 1138 netdev = dev->nets[i]->netdev; 1139 unregister_netdev(netdev); 1140 free_candev(netdev); 1141 } 1142 } 1143 unlink_all_urbs(dev); 1144 kfree(dev); 1145 } 1146} 1147 1148/* usb specific object needed to register this driver with the usb subsystem */ 1149static struct usb_driver esd_usb2_driver = { 1150 .name = "esd_usb2", 1151 .probe = esd_usb2_probe, 1152 .disconnect = esd_usb2_disconnect, 1153 .id_table = esd_usb2_table, 1154}; 1155 1156module_usb_driver(esd_usb2_driver); 1157