esd_usb2.c revision efbd50d2f62fc1f69a3dcd153e63ba28cc8eb27f
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 esd_usb2 *dev; 468 struct net_device *netdev; 469 size_t size = sizeof(struct esd_usb2_msg); 470 471 WARN_ON(!context); 472 473 priv = context->priv; 474 netdev = priv->netdev; 475 dev = priv->usb2; 476 477 /* free up our allocated buffer */ 478 usb_free_coherent(urb->dev, size, 479 urb->transfer_buffer, urb->transfer_dma); 480 481 if (!netif_device_present(netdev)) 482 return; 483 484 if (urb->status) 485 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status); 486 487 netdev->trans_start = jiffies; 488} 489 490static ssize_t show_firmware(struct device *d, 491 struct device_attribute *attr, char *buf) 492{ 493 struct usb_interface *intf = to_usb_interface(d); 494 struct esd_usb2 *dev = usb_get_intfdata(intf); 495 496 return sprintf(buf, "%d.%d.%d\n", 497 (dev->version >> 12) & 0xf, 498 (dev->version >> 8) & 0xf, 499 dev->version & 0xff); 500} 501static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL); 502 503static ssize_t show_hardware(struct device *d, 504 struct device_attribute *attr, char *buf) 505{ 506 struct usb_interface *intf = to_usb_interface(d); 507 struct esd_usb2 *dev = usb_get_intfdata(intf); 508 509 return sprintf(buf, "%d.%d.%d\n", 510 (dev->version >> 28) & 0xf, 511 (dev->version >> 24) & 0xf, 512 (dev->version >> 16) & 0xff); 513} 514static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL); 515 516static ssize_t show_nets(struct device *d, 517 struct device_attribute *attr, char *buf) 518{ 519 struct usb_interface *intf = to_usb_interface(d); 520 struct esd_usb2 *dev = usb_get_intfdata(intf); 521 522 return sprintf(buf, "%d", dev->net_count); 523} 524static DEVICE_ATTR(nets, S_IRUGO, show_nets, NULL); 525 526static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg) 527{ 528 int actual_length; 529 530 return usb_bulk_msg(dev->udev, 531 usb_sndbulkpipe(dev->udev, 2), 532 msg, 533 msg->msg.hdr.len << 2, 534 &actual_length, 535 1000); 536} 537 538static int esd_usb2_wait_msg(struct esd_usb2 *dev, 539 struct esd_usb2_msg *msg) 540{ 541 int actual_length; 542 543 return usb_bulk_msg(dev->udev, 544 usb_rcvbulkpipe(dev->udev, 1), 545 msg, 546 sizeof(*msg), 547 &actual_length, 548 1000); 549} 550 551static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev) 552{ 553 int i, err = 0; 554 555 if (dev->rxinitdone) 556 return 0; 557 558 for (i = 0; i < MAX_RX_URBS; i++) { 559 struct urb *urb = NULL; 560 u8 *buf = NULL; 561 562 /* create a URB, and a buffer for it */ 563 urb = usb_alloc_urb(0, GFP_KERNEL); 564 if (!urb) { 565 dev_warn(dev->udev->dev.parent, 566 "No memory left for URBs\n"); 567 err = -ENOMEM; 568 break; 569 } 570 571 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, 572 &urb->transfer_dma); 573 if (!buf) { 574 dev_warn(dev->udev->dev.parent, 575 "No memory left for USB buffer\n"); 576 err = -ENOMEM; 577 goto freeurb; 578 } 579 580 usb_fill_bulk_urb(urb, dev->udev, 581 usb_rcvbulkpipe(dev->udev, 1), 582 buf, RX_BUFFER_SIZE, 583 esd_usb2_read_bulk_callback, dev); 584 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 585 usb_anchor_urb(urb, &dev->rx_submitted); 586 587 err = usb_submit_urb(urb, GFP_KERNEL); 588 if (err) { 589 usb_unanchor_urb(urb); 590 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, 591 urb->transfer_dma); 592 } 593 594freeurb: 595 /* Drop reference, USB core will take care of freeing it */ 596 usb_free_urb(urb); 597 if (err) 598 break; 599 } 600 601 /* Did we submit any URBs */ 602 if (i == 0) { 603 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n"); 604 return err; 605 } 606 607 /* Warn if we've couldn't transmit all the URBs */ 608 if (i < MAX_RX_URBS) { 609 dev_warn(dev->udev->dev.parent, 610 "rx performance may be slow\n"); 611 } 612 613 dev->rxinitdone = 1; 614 return 0; 615} 616 617/* 618 * Start interface 619 */ 620static int esd_usb2_start(struct esd_usb2_net_priv *priv) 621{ 622 struct esd_usb2 *dev = priv->usb2; 623 struct net_device *netdev = priv->netdev; 624 struct esd_usb2_msg *msg; 625 int err, i; 626 627 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 628 if (!msg) { 629 err = -ENOMEM; 630 goto out; 631 } 632 633 /* 634 * Enable all IDs 635 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits). 636 * Each bit represents one 11 bit CAN identifier. A set bit 637 * enables reception of the corresponding CAN identifier. A cleared 638 * bit disabled this identifier. An additional bitmask value 639 * following the CAN 2.0A bits is used to enable reception of 640 * extended CAN frames. Only the LSB of this final mask is checked 641 * for the complete 29 bit ID range. The IDADD message also allows 642 * filter configuration for an ID subset. In this case you can add 643 * the number of the starting bitmask (0..64) to the filter.option 644 * field followed by only some bitmasks. 645 */ 646 msg->msg.hdr.cmd = CMD_IDADD; 647 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 648 msg->msg.filter.net = priv->index; 649 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 650 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++) 651 msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff); 652 /* enable 29bit extended IDs */ 653 msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001); 654 655 err = esd_usb2_send_msg(dev, msg); 656 if (err) 657 goto out; 658 659 err = esd_usb2_setup_rx_urbs(dev); 660 if (err) 661 goto out; 662 663 priv->can.state = CAN_STATE_ERROR_ACTIVE; 664 665out: 666 if (err == -ENODEV) 667 netif_device_detach(netdev); 668 if (err) 669 netdev_err(netdev, "couldn't start device: %d\n", err); 670 671 kfree(msg); 672 return err; 673} 674 675static void unlink_all_urbs(struct esd_usb2 *dev) 676{ 677 struct esd_usb2_net_priv *priv; 678 int i, j; 679 680 usb_kill_anchored_urbs(&dev->rx_submitted); 681 for (i = 0; i < dev->net_count; i++) { 682 priv = dev->nets[i]; 683 if (priv) { 684 usb_kill_anchored_urbs(&priv->tx_submitted); 685 atomic_set(&priv->active_tx_jobs, 0); 686 687 for (j = 0; j < MAX_TX_URBS; j++) 688 priv->tx_contexts[j].echo_index = MAX_TX_URBS; 689 } 690 } 691} 692 693static int esd_usb2_open(struct net_device *netdev) 694{ 695 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 696 int err; 697 698 /* common open */ 699 err = open_candev(netdev); 700 if (err) 701 return err; 702 703 /* finally start device */ 704 err = esd_usb2_start(priv); 705 if (err) { 706 netdev_warn(netdev, "couldn't start device: %d\n", err); 707 close_candev(netdev); 708 return err; 709 } 710 711 netif_start_queue(netdev); 712 713 return 0; 714} 715 716static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb, 717 struct net_device *netdev) 718{ 719 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 720 struct esd_usb2 *dev = priv->usb2; 721 struct esd_tx_urb_context *context = NULL; 722 struct net_device_stats *stats = &netdev->stats; 723 struct can_frame *cf = (struct can_frame *)skb->data; 724 struct esd_usb2_msg *msg; 725 struct urb *urb; 726 u8 *buf; 727 int i, err; 728 int ret = NETDEV_TX_OK; 729 size_t size = sizeof(struct esd_usb2_msg); 730 731 if (can_dropped_invalid_skb(netdev, skb)) 732 return NETDEV_TX_OK; 733 734 /* create a URB, and a buffer for it, and copy the data to the URB */ 735 urb = usb_alloc_urb(0, GFP_ATOMIC); 736 if (!urb) { 737 netdev_err(netdev, "No memory left for URBs\n"); 738 stats->tx_dropped++; 739 dev_kfree_skb(skb); 740 goto nourbmem; 741 } 742 743 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, 744 &urb->transfer_dma); 745 if (!buf) { 746 netdev_err(netdev, "No memory left for USB buffer\n"); 747 stats->tx_dropped++; 748 dev_kfree_skb(skb); 749 goto nobufmem; 750 } 751 752 msg = (struct esd_usb2_msg *)buf; 753 754 msg->msg.hdr.len = 3; /* minimal length */ 755 msg->msg.hdr.cmd = CMD_CAN_TX; 756 msg->msg.tx.net = priv->index; 757 msg->msg.tx.dlc = cf->can_dlc; 758 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); 759 760 if (cf->can_id & CAN_RTR_FLAG) 761 msg->msg.tx.dlc |= ESD_RTR; 762 763 if (cf->can_id & CAN_EFF_FLAG) 764 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID); 765 766 for (i = 0; i < cf->can_dlc; i++) 767 msg->msg.tx.data[i] = cf->data[i]; 768 769 msg->msg.hdr.len += (cf->can_dlc + 3) >> 2; 770 771 for (i = 0; i < MAX_TX_URBS; i++) { 772 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { 773 context = &priv->tx_contexts[i]; 774 break; 775 } 776 } 777 778 /* 779 * This may never happen. 780 */ 781 if (!context) { 782 netdev_warn(netdev, "couldn't find free context\n"); 783 ret = NETDEV_TX_BUSY; 784 goto releasebuf; 785 } 786 787 context->priv = priv; 788 context->echo_index = i; 789 context->dlc = cf->can_dlc; 790 791 /* hnd must not be 0 - MSB is stripped in txdone handling */ 792 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */ 793 794 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, 795 msg->msg.hdr.len << 2, 796 esd_usb2_write_bulk_callback, context); 797 798 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 799 800 usb_anchor_urb(urb, &priv->tx_submitted); 801 802 can_put_echo_skb(skb, netdev, context->echo_index); 803 804 atomic_inc(&priv->active_tx_jobs); 805 806 /* Slow down tx path */ 807 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS) 808 netif_stop_queue(netdev); 809 810 err = usb_submit_urb(urb, GFP_ATOMIC); 811 if (err) { 812 can_free_echo_skb(netdev, context->echo_index); 813 814 atomic_dec(&priv->active_tx_jobs); 815 usb_unanchor_urb(urb); 816 817 stats->tx_dropped++; 818 819 if (err == -ENODEV) 820 netif_device_detach(netdev); 821 else 822 netdev_warn(netdev, "failed tx_urb %d\n", err); 823 824 goto releasebuf; 825 } 826 827 netdev->trans_start = jiffies; 828 829 /* 830 * Release our reference to this URB, the USB core will eventually free 831 * it entirely. 832 */ 833 usb_free_urb(urb); 834 835 return NETDEV_TX_OK; 836 837releasebuf: 838 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); 839 840nobufmem: 841 usb_free_urb(urb); 842 843nourbmem: 844 return ret; 845} 846 847static int esd_usb2_close(struct net_device *netdev) 848{ 849 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 850 struct esd_usb2_msg *msg; 851 int i; 852 853 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 854 if (!msg) 855 return -ENOMEM; 856 857 /* Disable all IDs (see esd_usb2_start()) */ 858 msg->msg.hdr.cmd = CMD_IDADD; 859 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 860 msg->msg.filter.net = priv->index; 861 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 862 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++) 863 msg->msg.filter.mask[i] = 0; 864 if (esd_usb2_send_msg(priv->usb2, msg) < 0) 865 netdev_err(netdev, "sending idadd message failed\n"); 866 867 /* set CAN controller to reset mode */ 868 msg->msg.hdr.len = 2; 869 msg->msg.hdr.cmd = CMD_SETBAUD; 870 msg->msg.setbaud.net = priv->index; 871 msg->msg.setbaud.rsvd = 0; 872 msg->msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE); 873 if (esd_usb2_send_msg(priv->usb2, msg) < 0) 874 netdev_err(netdev, "sending setbaud message failed\n"); 875 876 priv->can.state = CAN_STATE_STOPPED; 877 878 netif_stop_queue(netdev); 879 880 close_candev(netdev); 881 882 kfree(msg); 883 884 return 0; 885} 886 887static const struct net_device_ops esd_usb2_netdev_ops = { 888 .ndo_open = esd_usb2_open, 889 .ndo_stop = esd_usb2_close, 890 .ndo_start_xmit = esd_usb2_start_xmit, 891 .ndo_change_mtu = can_change_mtu, 892}; 893 894static const struct can_bittiming_const esd_usb2_bittiming_const = { 895 .name = "esd_usb2", 896 .tseg1_min = ESD_USB2_TSEG1_MIN, 897 .tseg1_max = ESD_USB2_TSEG1_MAX, 898 .tseg2_min = ESD_USB2_TSEG2_MIN, 899 .tseg2_max = ESD_USB2_TSEG2_MAX, 900 .sjw_max = ESD_USB2_SJW_MAX, 901 .brp_min = ESD_USB2_BRP_MIN, 902 .brp_max = ESD_USB2_BRP_MAX, 903 .brp_inc = ESD_USB2_BRP_INC, 904}; 905 906static int esd_usb2_set_bittiming(struct net_device *netdev) 907{ 908 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 909 struct can_bittiming *bt = &priv->can.bittiming; 910 struct esd_usb2_msg *msg; 911 int err; 912 u32 canbtr; 913 int sjw_shift; 914 915 canbtr = ESD_USB2_UBR; 916 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) 917 canbtr |= ESD_USB2_LOM; 918 919 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1); 920 921 if (le16_to_cpu(priv->usb2->udev->descriptor.idProduct) == 922 USB_CANUSBM_PRODUCT_ID) 923 sjw_shift = ESD_USBM_SJW_SHIFT; 924 else 925 sjw_shift = ESD_USB2_SJW_SHIFT; 926 927 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1)) 928 << sjw_shift; 929 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1) 930 & (ESD_USB2_TSEG1_MAX - 1)) 931 << ESD_USB2_TSEG1_SHIFT; 932 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1)) 933 << ESD_USB2_TSEG2_SHIFT; 934 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 935 canbtr |= ESD_USB2_3_SAMPLES; 936 937 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 938 if (!msg) 939 return -ENOMEM; 940 941 msg->msg.hdr.len = 2; 942 msg->msg.hdr.cmd = CMD_SETBAUD; 943 msg->msg.setbaud.net = priv->index; 944 msg->msg.setbaud.rsvd = 0; 945 msg->msg.setbaud.baud = cpu_to_le32(canbtr); 946 947 netdev_info(netdev, "setting BTR=%#x\n", canbtr); 948 949 err = esd_usb2_send_msg(priv->usb2, msg); 950 951 kfree(msg); 952 return err; 953} 954 955static int esd_usb2_get_berr_counter(const struct net_device *netdev, 956 struct can_berr_counter *bec) 957{ 958 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 959 960 bec->txerr = priv->bec.txerr; 961 bec->rxerr = priv->bec.rxerr; 962 963 return 0; 964} 965 966static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode) 967{ 968 switch (mode) { 969 case CAN_MODE_START: 970 netif_wake_queue(netdev); 971 break; 972 973 default: 974 return -EOPNOTSUPP; 975 } 976 977 return 0; 978} 979 980static int esd_usb2_probe_one_net(struct usb_interface *intf, int index) 981{ 982 struct esd_usb2 *dev = usb_get_intfdata(intf); 983 struct net_device *netdev; 984 struct esd_usb2_net_priv *priv; 985 int err = 0; 986 int i; 987 988 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS); 989 if (!netdev) { 990 dev_err(&intf->dev, "couldn't alloc candev\n"); 991 err = -ENOMEM; 992 goto done; 993 } 994 995 priv = netdev_priv(netdev); 996 997 init_usb_anchor(&priv->tx_submitted); 998 atomic_set(&priv->active_tx_jobs, 0); 999 1000 for (i = 0; i < MAX_TX_URBS; i++) 1001 priv->tx_contexts[i].echo_index = MAX_TX_URBS; 1002 1003 priv->usb2 = dev; 1004 priv->netdev = netdev; 1005 priv->index = index; 1006 1007 priv->can.state = CAN_STATE_STOPPED; 1008 priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY; 1009 1010 if (le16_to_cpu(dev->udev->descriptor.idProduct) == 1011 USB_CANUSBM_PRODUCT_ID) 1012 priv->can.clock.freq = ESD_USBM_CAN_CLOCK; 1013 else { 1014 priv->can.clock.freq = ESD_USB2_CAN_CLOCK; 1015 priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES; 1016 } 1017 1018 priv->can.bittiming_const = &esd_usb2_bittiming_const; 1019 priv->can.do_set_bittiming = esd_usb2_set_bittiming; 1020 priv->can.do_set_mode = esd_usb2_set_mode; 1021 priv->can.do_get_berr_counter = esd_usb2_get_berr_counter; 1022 1023 netdev->flags |= IFF_ECHO; /* we support local echo */ 1024 1025 netdev->netdev_ops = &esd_usb2_netdev_ops; 1026 1027 SET_NETDEV_DEV(netdev, &intf->dev); 1028 netdev->dev_id = index; 1029 1030 err = register_candev(netdev); 1031 if (err) { 1032 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err); 1033 free_candev(netdev); 1034 err = -ENOMEM; 1035 goto done; 1036 } 1037 1038 dev->nets[index] = priv; 1039 netdev_info(netdev, "device %s registered\n", netdev->name); 1040 1041done: 1042 return err; 1043} 1044 1045/* 1046 * probe function for new USB2 devices 1047 * 1048 * check version information and number of available 1049 * CAN interfaces 1050 */ 1051static int esd_usb2_probe(struct usb_interface *intf, 1052 const struct usb_device_id *id) 1053{ 1054 struct esd_usb2 *dev; 1055 struct esd_usb2_msg *msg; 1056 int i, err; 1057 1058 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 1059 if (!dev) { 1060 err = -ENOMEM; 1061 goto done; 1062 } 1063 1064 dev->udev = interface_to_usbdev(intf); 1065 1066 init_usb_anchor(&dev->rx_submitted); 1067 1068 usb_set_intfdata(intf, dev); 1069 1070 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 1071 if (!msg) { 1072 err = -ENOMEM; 1073 goto free_msg; 1074 } 1075 1076 /* query number of CAN interfaces (nets) */ 1077 msg->msg.hdr.cmd = CMD_VERSION; 1078 msg->msg.hdr.len = 2; 1079 msg->msg.version.rsvd = 0; 1080 msg->msg.version.flags = 0; 1081 msg->msg.version.drv_version = 0; 1082 1083 err = esd_usb2_send_msg(dev, msg); 1084 if (err < 0) { 1085 dev_err(&intf->dev, "sending version message failed\n"); 1086 goto free_msg; 1087 } 1088 1089 err = esd_usb2_wait_msg(dev, msg); 1090 if (err < 0) { 1091 dev_err(&intf->dev, "no version message answer\n"); 1092 goto free_msg; 1093 } 1094 1095 dev->net_count = (int)msg->msg.version_reply.nets; 1096 dev->version = le32_to_cpu(msg->msg.version_reply.version); 1097 1098 if (device_create_file(&intf->dev, &dev_attr_firmware)) 1099 dev_err(&intf->dev, 1100 "Couldn't create device file for firmware\n"); 1101 1102 if (device_create_file(&intf->dev, &dev_attr_hardware)) 1103 dev_err(&intf->dev, 1104 "Couldn't create device file for hardware\n"); 1105 1106 if (device_create_file(&intf->dev, &dev_attr_nets)) 1107 dev_err(&intf->dev, 1108 "Couldn't create device file for nets\n"); 1109 1110 /* do per device probing */ 1111 for (i = 0; i < dev->net_count; i++) 1112 esd_usb2_probe_one_net(intf, i); 1113 1114free_msg: 1115 kfree(msg); 1116 if (err) 1117 kfree(dev); 1118done: 1119 return err; 1120} 1121 1122/* 1123 * called by the usb core when the device is removed from the system 1124 */ 1125static void esd_usb2_disconnect(struct usb_interface *intf) 1126{ 1127 struct esd_usb2 *dev = usb_get_intfdata(intf); 1128 struct net_device *netdev; 1129 int i; 1130 1131 device_remove_file(&intf->dev, &dev_attr_firmware); 1132 device_remove_file(&intf->dev, &dev_attr_hardware); 1133 device_remove_file(&intf->dev, &dev_attr_nets); 1134 1135 usb_set_intfdata(intf, NULL); 1136 1137 if (dev) { 1138 for (i = 0; i < dev->net_count; i++) { 1139 if (dev->nets[i]) { 1140 netdev = dev->nets[i]->netdev; 1141 unregister_netdev(netdev); 1142 free_candev(netdev); 1143 } 1144 } 1145 unlink_all_urbs(dev); 1146 kfree(dev); 1147 } 1148} 1149 1150/* usb specific object needed to register this driver with the usb subsystem */ 1151static struct usb_driver esd_usb2_driver = { 1152 .name = "esd_usb2", 1153 .probe = esd_usb2_probe, 1154 .disconnect = esd_usb2_disconnect, 1155 .id_table = esd_usb2_table, 1156}; 1157 1158module_usb_driver(esd_usb2_driver); 1159