esd_usb2.c revision fae37f81fdf3680c5d70abdc57e7b83f4b6c266a
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 struct esd_usb2 *usb2; 221 struct net_device *netdev; 222 int index; 223 u8 old_state; 224 struct can_berr_counter bec; 225}; 226 227static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv, 228 struct esd_usb2_msg *msg) 229{ 230 struct net_device_stats *stats = &priv->netdev->stats; 231 struct can_frame *cf; 232 struct sk_buff *skb; 233 u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK; 234 235 if (id == ESD_EV_CAN_ERROR_EXT) { 236 u8 state = msg->msg.rx.data[0]; 237 u8 ecc = msg->msg.rx.data[1]; 238 u8 txerr = msg->msg.rx.data[2]; 239 u8 rxerr = msg->msg.rx.data[3]; 240 241 skb = alloc_can_err_skb(priv->netdev, &cf); 242 if (skb == NULL) { 243 stats->rx_dropped++; 244 return; 245 } 246 247 if (state != priv->old_state) { 248 priv->old_state = state; 249 250 switch (state & ESD_BUSSTATE_MASK) { 251 case ESD_BUSSTATE_BUSOFF: 252 priv->can.state = CAN_STATE_BUS_OFF; 253 cf->can_id |= CAN_ERR_BUSOFF; 254 can_bus_off(priv->netdev); 255 break; 256 case ESD_BUSSTATE_WARN: 257 priv->can.state = CAN_STATE_ERROR_WARNING; 258 priv->can.can_stats.error_warning++; 259 break; 260 case ESD_BUSSTATE_ERRPASSIVE: 261 priv->can.state = CAN_STATE_ERROR_PASSIVE; 262 priv->can.can_stats.error_passive++; 263 break; 264 default: 265 priv->can.state = CAN_STATE_ERROR_ACTIVE; 266 break; 267 } 268 } else { 269 priv->can.can_stats.bus_error++; 270 stats->rx_errors++; 271 272 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; 273 274 switch (ecc & SJA1000_ECC_MASK) { 275 case SJA1000_ECC_BIT: 276 cf->data[2] |= CAN_ERR_PROT_BIT; 277 break; 278 case SJA1000_ECC_FORM: 279 cf->data[2] |= CAN_ERR_PROT_FORM; 280 break; 281 case SJA1000_ECC_STUFF: 282 cf->data[2] |= CAN_ERR_PROT_STUFF; 283 break; 284 default: 285 cf->data[2] |= CAN_ERR_PROT_UNSPEC; 286 cf->data[3] = ecc & SJA1000_ECC_SEG; 287 break; 288 } 289 290 /* Error occurred during transmission? */ 291 if (!(ecc & SJA1000_ECC_DIR)) 292 cf->data[2] |= CAN_ERR_PROT_TX; 293 294 if (priv->can.state == CAN_STATE_ERROR_WARNING || 295 priv->can.state == CAN_STATE_ERROR_PASSIVE) { 296 cf->data[1] = (txerr > rxerr) ? 297 CAN_ERR_CRTL_TX_PASSIVE : 298 CAN_ERR_CRTL_RX_PASSIVE; 299 } 300 cf->data[6] = txerr; 301 cf->data[7] = rxerr; 302 } 303 304 netif_rx(skb); 305 306 priv->bec.txerr = txerr; 307 priv->bec.rxerr = rxerr; 308 309 stats->rx_packets++; 310 stats->rx_bytes += cf->can_dlc; 311 } 312} 313 314static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv, 315 struct esd_usb2_msg *msg) 316{ 317 struct net_device_stats *stats = &priv->netdev->stats; 318 struct can_frame *cf; 319 struct sk_buff *skb; 320 int i; 321 u32 id; 322 323 if (!netif_device_present(priv->netdev)) 324 return; 325 326 id = le32_to_cpu(msg->msg.rx.id); 327 328 if (id & ESD_EVENT) { 329 esd_usb2_rx_event(priv, msg); 330 } else { 331 skb = alloc_can_skb(priv->netdev, &cf); 332 if (skb == NULL) { 333 stats->rx_dropped++; 334 return; 335 } 336 337 cf->can_id = id & ESD_IDMASK; 338 cf->can_dlc = get_can_dlc(msg->msg.rx.dlc); 339 340 if (id & ESD_EXTID) 341 cf->can_id |= CAN_EFF_FLAG; 342 343 if (msg->msg.rx.dlc & ESD_RTR) { 344 cf->can_id |= CAN_RTR_FLAG; 345 } else { 346 for (i = 0; i < cf->can_dlc; i++) 347 cf->data[i] = msg->msg.rx.data[i]; 348 } 349 350 netif_rx(skb); 351 352 stats->rx_packets++; 353 stats->rx_bytes += cf->can_dlc; 354 } 355 356 return; 357} 358 359static void esd_usb2_tx_done_msg(struct esd_usb2_net_priv *priv, 360 struct esd_usb2_msg *msg) 361{ 362 struct net_device_stats *stats = &priv->netdev->stats; 363 struct net_device *netdev = priv->netdev; 364 struct esd_tx_urb_context *context; 365 366 if (!netif_device_present(netdev)) 367 return; 368 369 context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)]; 370 371 if (!msg->msg.txdone.status) { 372 stats->tx_packets++; 373 stats->tx_bytes += context->dlc; 374 can_get_echo_skb(netdev, context->echo_index); 375 } else { 376 stats->tx_errors++; 377 can_free_echo_skb(netdev, context->echo_index); 378 } 379 380 /* Release context */ 381 context->echo_index = MAX_TX_URBS; 382 atomic_dec(&priv->active_tx_jobs); 383 384 netif_wake_queue(netdev); 385} 386 387static void esd_usb2_read_bulk_callback(struct urb *urb) 388{ 389 struct esd_usb2 *dev = urb->context; 390 int retval; 391 int pos = 0; 392 int i; 393 394 switch (urb->status) { 395 case 0: /* success */ 396 break; 397 398 case -ENOENT: 399 case -ESHUTDOWN: 400 return; 401 402 default: 403 dev_info(dev->udev->dev.parent, 404 "Rx URB aborted (%d)\n", urb->status); 405 goto resubmit_urb; 406 } 407 408 while (pos < urb->actual_length) { 409 struct esd_usb2_msg *msg; 410 411 msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos); 412 413 switch (msg->msg.hdr.cmd) { 414 case CMD_CAN_RX: 415 esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg); 416 break; 417 418 case CMD_CAN_TX: 419 esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net], 420 msg); 421 break; 422 } 423 424 pos += msg->msg.hdr.len << 2; 425 426 if (pos > urb->actual_length) { 427 dev_err(dev->udev->dev.parent, "format error\n"); 428 break; 429 } 430 } 431 432resubmit_urb: 433 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1), 434 urb->transfer_buffer, RX_BUFFER_SIZE, 435 esd_usb2_read_bulk_callback, dev); 436 437 retval = usb_submit_urb(urb, GFP_ATOMIC); 438 if (retval == -ENODEV) { 439 for (i = 0; i < dev->net_count; i++) { 440 if (dev->nets[i]) 441 netif_device_detach(dev->nets[i]->netdev); 442 } 443 } else if (retval) { 444 dev_err(dev->udev->dev.parent, 445 "failed resubmitting read bulk urb: %d\n", retval); 446 } 447 448 return; 449} 450 451/* 452 * callback for bulk IN urb 453 */ 454static void esd_usb2_write_bulk_callback(struct urb *urb) 455{ 456 struct esd_tx_urb_context *context = urb->context; 457 struct esd_usb2_net_priv *priv; 458 struct esd_usb2 *dev; 459 struct net_device *netdev; 460 size_t size = sizeof(struct esd_usb2_msg); 461 462 WARN_ON(!context); 463 464 priv = context->priv; 465 netdev = priv->netdev; 466 dev = priv->usb2; 467 468 /* free up our allocated buffer */ 469 usb_free_coherent(urb->dev, size, 470 urb->transfer_buffer, urb->transfer_dma); 471 472 if (!netif_device_present(netdev)) 473 return; 474 475 if (urb->status) 476 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status); 477 478 netdev->trans_start = jiffies; 479} 480 481static ssize_t show_firmware(struct device *d, 482 struct device_attribute *attr, char *buf) 483{ 484 struct usb_interface *intf = to_usb_interface(d); 485 struct esd_usb2 *dev = usb_get_intfdata(intf); 486 487 return sprintf(buf, "%d.%d.%d\n", 488 (dev->version >> 12) & 0xf, 489 (dev->version >> 8) & 0xf, 490 dev->version & 0xff); 491} 492static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL); 493 494static ssize_t show_hardware(struct device *d, 495 struct device_attribute *attr, char *buf) 496{ 497 struct usb_interface *intf = to_usb_interface(d); 498 struct esd_usb2 *dev = usb_get_intfdata(intf); 499 500 return sprintf(buf, "%d.%d.%d\n", 501 (dev->version >> 28) & 0xf, 502 (dev->version >> 24) & 0xf, 503 (dev->version >> 16) & 0xff); 504} 505static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL); 506 507static ssize_t show_nets(struct device *d, 508 struct device_attribute *attr, char *buf) 509{ 510 struct usb_interface *intf = to_usb_interface(d); 511 struct esd_usb2 *dev = usb_get_intfdata(intf); 512 513 return sprintf(buf, "%d", dev->net_count); 514} 515static DEVICE_ATTR(nets, S_IRUGO, show_nets, NULL); 516 517static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg) 518{ 519 int actual_length; 520 521 return usb_bulk_msg(dev->udev, 522 usb_sndbulkpipe(dev->udev, 2), 523 msg, 524 msg->msg.hdr.len << 2, 525 &actual_length, 526 1000); 527} 528 529static int esd_usb2_wait_msg(struct esd_usb2 *dev, 530 struct esd_usb2_msg *msg) 531{ 532 int actual_length; 533 534 return usb_bulk_msg(dev->udev, 535 usb_rcvbulkpipe(dev->udev, 1), 536 msg, 537 sizeof(*msg), 538 &actual_length, 539 1000); 540} 541 542static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev) 543{ 544 int i, err = 0; 545 546 if (dev->rxinitdone) 547 return 0; 548 549 for (i = 0; i < MAX_RX_URBS; i++) { 550 struct urb *urb = NULL; 551 u8 *buf = NULL; 552 553 /* create a URB, and a buffer for it */ 554 urb = usb_alloc_urb(0, GFP_KERNEL); 555 if (!urb) { 556 dev_warn(dev->udev->dev.parent, 557 "No memory left for URBs\n"); 558 err = -ENOMEM; 559 break; 560 } 561 562 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, 563 &urb->transfer_dma); 564 if (!buf) { 565 dev_warn(dev->udev->dev.parent, 566 "No memory left for USB buffer\n"); 567 err = -ENOMEM; 568 goto freeurb; 569 } 570 571 usb_fill_bulk_urb(urb, dev->udev, 572 usb_rcvbulkpipe(dev->udev, 1), 573 buf, RX_BUFFER_SIZE, 574 esd_usb2_read_bulk_callback, dev); 575 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 576 usb_anchor_urb(urb, &dev->rx_submitted); 577 578 err = usb_submit_urb(urb, GFP_KERNEL); 579 if (err) { 580 usb_unanchor_urb(urb); 581 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, 582 urb->transfer_dma); 583 } 584 585freeurb: 586 /* Drop reference, USB core will take care of freeing it */ 587 usb_free_urb(urb); 588 if (err) 589 break; 590 } 591 592 /* Did we submit any URBs */ 593 if (i == 0) { 594 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n"); 595 return err; 596 } 597 598 /* Warn if we've couldn't transmit all the URBs */ 599 if (i < MAX_RX_URBS) { 600 dev_warn(dev->udev->dev.parent, 601 "rx performance may be slow\n"); 602 } 603 604 dev->rxinitdone = 1; 605 return 0; 606} 607 608/* 609 * Start interface 610 */ 611static int esd_usb2_start(struct esd_usb2_net_priv *priv) 612{ 613 struct esd_usb2 *dev = priv->usb2; 614 struct net_device *netdev = priv->netdev; 615 struct esd_usb2_msg *msg; 616 int err, i; 617 618 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 619 if (!msg) { 620 err = -ENOMEM; 621 goto out; 622 } 623 624 /* 625 * Enable all IDs 626 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits). 627 * Each bit represents one 11 bit CAN identifier. A set bit 628 * enables reception of the corresponding CAN identifier. A cleared 629 * bit disabled this identifier. An additional bitmask value 630 * following the CAN 2.0A bits is used to enable reception of 631 * extended CAN frames. Only the LSB of this final mask is checked 632 * for the complete 29 bit ID range. The IDADD message also allows 633 * filter configuration for an ID subset. In this case you can add 634 * the number of the starting bitmask (0..64) to the filter.option 635 * field followed by only some bitmasks. 636 */ 637 msg->msg.hdr.cmd = CMD_IDADD; 638 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 639 msg->msg.filter.net = priv->index; 640 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 641 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++) 642 msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff); 643 /* enable 29bit extended IDs */ 644 msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001); 645 646 err = esd_usb2_send_msg(dev, msg); 647 if (err) 648 goto out; 649 650 err = esd_usb2_setup_rx_urbs(dev); 651 if (err) 652 goto out; 653 654 priv->can.state = CAN_STATE_ERROR_ACTIVE; 655 656out: 657 if (err == -ENODEV) 658 netif_device_detach(netdev); 659 if (err) 660 netdev_err(netdev, "couldn't start device: %d\n", err); 661 662 kfree(msg); 663 return err; 664} 665 666static void unlink_all_urbs(struct esd_usb2 *dev) 667{ 668 struct esd_usb2_net_priv *priv; 669 int i, j; 670 671 usb_kill_anchored_urbs(&dev->rx_submitted); 672 for (i = 0; i < dev->net_count; i++) { 673 priv = dev->nets[i]; 674 if (priv) { 675 usb_kill_anchored_urbs(&priv->tx_submitted); 676 atomic_set(&priv->active_tx_jobs, 0); 677 678 for (j = 0; j < MAX_TX_URBS; j++) 679 priv->tx_contexts[j].echo_index = MAX_TX_URBS; 680 } 681 } 682} 683 684static int esd_usb2_open(struct net_device *netdev) 685{ 686 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 687 int err; 688 689 /* common open */ 690 err = open_candev(netdev); 691 if (err) 692 return err; 693 694 /* finally start device */ 695 err = esd_usb2_start(priv); 696 if (err) { 697 netdev_warn(netdev, "couldn't start device: %d\n", err); 698 close_candev(netdev); 699 return err; 700 } 701 702 netif_start_queue(netdev); 703 704 return 0; 705} 706 707static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb, 708 struct net_device *netdev) 709{ 710 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 711 struct esd_usb2 *dev = priv->usb2; 712 struct esd_tx_urb_context *context = NULL; 713 struct net_device_stats *stats = &netdev->stats; 714 struct can_frame *cf = (struct can_frame *)skb->data; 715 struct esd_usb2_msg *msg; 716 struct urb *urb; 717 u8 *buf; 718 int i, err; 719 int ret = NETDEV_TX_OK; 720 size_t size = sizeof(struct esd_usb2_msg); 721 722 if (can_dropped_invalid_skb(netdev, skb)) 723 return NETDEV_TX_OK; 724 725 /* create a URB, and a buffer for it, and copy the data to the URB */ 726 urb = usb_alloc_urb(0, GFP_ATOMIC); 727 if (!urb) { 728 netdev_err(netdev, "No memory left for URBs\n"); 729 stats->tx_dropped++; 730 dev_kfree_skb(skb); 731 goto nourbmem; 732 } 733 734 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, 735 &urb->transfer_dma); 736 if (!buf) { 737 netdev_err(netdev, "No memory left for USB buffer\n"); 738 stats->tx_dropped++; 739 dev_kfree_skb(skb); 740 goto nobufmem; 741 } 742 743 msg = (struct esd_usb2_msg *)buf; 744 745 msg->msg.hdr.len = 3; /* minimal length */ 746 msg->msg.hdr.cmd = CMD_CAN_TX; 747 msg->msg.tx.net = priv->index; 748 msg->msg.tx.dlc = cf->can_dlc; 749 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); 750 751 if (cf->can_id & CAN_RTR_FLAG) 752 msg->msg.tx.dlc |= ESD_RTR; 753 754 if (cf->can_id & CAN_EFF_FLAG) 755 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID); 756 757 for (i = 0; i < cf->can_dlc; i++) 758 msg->msg.tx.data[i] = cf->data[i]; 759 760 msg->msg.hdr.len += (cf->can_dlc + 3) >> 2; 761 762 for (i = 0; i < MAX_TX_URBS; i++) { 763 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { 764 context = &priv->tx_contexts[i]; 765 break; 766 } 767 } 768 769 /* 770 * This may never happen. 771 */ 772 if (!context) { 773 netdev_warn(netdev, "couldn't find free context\n"); 774 ret = NETDEV_TX_BUSY; 775 goto releasebuf; 776 } 777 778 context->priv = priv; 779 context->echo_index = i; 780 context->dlc = cf->can_dlc; 781 782 /* hnd must not be 0 - MSB is stripped in txdone handling */ 783 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */ 784 785 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, 786 msg->msg.hdr.len << 2, 787 esd_usb2_write_bulk_callback, context); 788 789 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 790 791 usb_anchor_urb(urb, &priv->tx_submitted); 792 793 can_put_echo_skb(skb, netdev, context->echo_index); 794 795 atomic_inc(&priv->active_tx_jobs); 796 797 /* Slow down tx path */ 798 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS) 799 netif_stop_queue(netdev); 800 801 err = usb_submit_urb(urb, GFP_ATOMIC); 802 if (err) { 803 can_free_echo_skb(netdev, context->echo_index); 804 805 atomic_dec(&priv->active_tx_jobs); 806 usb_unanchor_urb(urb); 807 808 stats->tx_dropped++; 809 810 if (err == -ENODEV) 811 netif_device_detach(netdev); 812 else 813 netdev_warn(netdev, "failed tx_urb %d\n", err); 814 815 goto releasebuf; 816 } 817 818 netdev->trans_start = jiffies; 819 820 /* 821 * Release our reference to this URB, the USB core will eventually free 822 * it entirely. 823 */ 824 usb_free_urb(urb); 825 826 return NETDEV_TX_OK; 827 828releasebuf: 829 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); 830 831nobufmem: 832 usb_free_urb(urb); 833 834nourbmem: 835 return ret; 836} 837 838static int esd_usb2_close(struct net_device *netdev) 839{ 840 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 841 struct esd_usb2_msg *msg; 842 int i; 843 844 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 845 if (!msg) 846 return -ENOMEM; 847 848 /* Disable all IDs (see esd_usb2_start()) */ 849 msg->msg.hdr.cmd = CMD_IDADD; 850 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 851 msg->msg.filter.net = priv->index; 852 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 853 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++) 854 msg->msg.filter.mask[i] = 0; 855 if (esd_usb2_send_msg(priv->usb2, msg) < 0) 856 netdev_err(netdev, "sending idadd message failed\n"); 857 858 /* set CAN controller to reset mode */ 859 msg->msg.hdr.len = 2; 860 msg->msg.hdr.cmd = CMD_SETBAUD; 861 msg->msg.setbaud.net = priv->index; 862 msg->msg.setbaud.rsvd = 0; 863 msg->msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE); 864 if (esd_usb2_send_msg(priv->usb2, msg) < 0) 865 netdev_err(netdev, "sending setbaud message failed\n"); 866 867 priv->can.state = CAN_STATE_STOPPED; 868 869 netif_stop_queue(netdev); 870 871 close_candev(netdev); 872 873 kfree(msg); 874 875 return 0; 876} 877 878static const struct net_device_ops esd_usb2_netdev_ops = { 879 .ndo_open = esd_usb2_open, 880 .ndo_stop = esd_usb2_close, 881 .ndo_start_xmit = esd_usb2_start_xmit, 882}; 883 884static const struct can_bittiming_const esd_usb2_bittiming_const = { 885 .name = "esd_usb2", 886 .tseg1_min = ESD_USB2_TSEG1_MIN, 887 .tseg1_max = ESD_USB2_TSEG1_MAX, 888 .tseg2_min = ESD_USB2_TSEG2_MIN, 889 .tseg2_max = ESD_USB2_TSEG2_MAX, 890 .sjw_max = ESD_USB2_SJW_MAX, 891 .brp_min = ESD_USB2_BRP_MIN, 892 .brp_max = ESD_USB2_BRP_MAX, 893 .brp_inc = ESD_USB2_BRP_INC, 894}; 895 896static int esd_usb2_set_bittiming(struct net_device *netdev) 897{ 898 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 899 struct can_bittiming *bt = &priv->can.bittiming; 900 struct esd_usb2_msg *msg; 901 int err; 902 u32 canbtr; 903 int sjw_shift; 904 905 canbtr = ESD_USB2_UBR; 906 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) 907 canbtr |= ESD_USB2_LOM; 908 909 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1); 910 911 if (le16_to_cpu(priv->usb2->udev->descriptor.idProduct) == 912 USB_CANUSBM_PRODUCT_ID) 913 sjw_shift = ESD_USBM_SJW_SHIFT; 914 else 915 sjw_shift = ESD_USB2_SJW_SHIFT; 916 917 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1)) 918 << sjw_shift; 919 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1) 920 & (ESD_USB2_TSEG1_MAX - 1)) 921 << ESD_USB2_TSEG1_SHIFT; 922 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1)) 923 << ESD_USB2_TSEG2_SHIFT; 924 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) 925 canbtr |= ESD_USB2_3_SAMPLES; 926 927 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 928 if (!msg) 929 return -ENOMEM; 930 931 msg->msg.hdr.len = 2; 932 msg->msg.hdr.cmd = CMD_SETBAUD; 933 msg->msg.setbaud.net = priv->index; 934 msg->msg.setbaud.rsvd = 0; 935 msg->msg.setbaud.baud = cpu_to_le32(canbtr); 936 937 netdev_info(netdev, "setting BTR=%#x\n", canbtr); 938 939 err = esd_usb2_send_msg(priv->usb2, msg); 940 941 kfree(msg); 942 return err; 943} 944 945static int esd_usb2_get_berr_counter(const struct net_device *netdev, 946 struct can_berr_counter *bec) 947{ 948 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 949 950 bec->txerr = priv->bec.txerr; 951 bec->rxerr = priv->bec.rxerr; 952 953 return 0; 954} 955 956static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode) 957{ 958 switch (mode) { 959 case CAN_MODE_START: 960 netif_wake_queue(netdev); 961 break; 962 963 default: 964 return -EOPNOTSUPP; 965 } 966 967 return 0; 968} 969 970static int esd_usb2_probe_one_net(struct usb_interface *intf, int index) 971{ 972 struct esd_usb2 *dev = usb_get_intfdata(intf); 973 struct net_device *netdev; 974 struct esd_usb2_net_priv *priv; 975 int err = 0; 976 int i; 977 978 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS); 979 if (!netdev) { 980 dev_err(&intf->dev, "couldn't alloc candev\n"); 981 err = -ENOMEM; 982 goto done; 983 } 984 985 priv = netdev_priv(netdev); 986 987 init_usb_anchor(&priv->tx_submitted); 988 atomic_set(&priv->active_tx_jobs, 0); 989 990 for (i = 0; i < MAX_TX_URBS; i++) 991 priv->tx_contexts[i].echo_index = MAX_TX_URBS; 992 993 priv->usb2 = dev; 994 priv->netdev = netdev; 995 priv->index = index; 996 997 priv->can.state = CAN_STATE_STOPPED; 998 priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY; 999 1000 if (le16_to_cpu(dev->udev->descriptor.idProduct) == 1001 USB_CANUSBM_PRODUCT_ID) 1002 priv->can.clock.freq = ESD_USBM_CAN_CLOCK; 1003 else { 1004 priv->can.clock.freq = ESD_USB2_CAN_CLOCK; 1005 priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES; 1006 } 1007 1008 priv->can.bittiming_const = &esd_usb2_bittiming_const; 1009 priv->can.do_set_bittiming = esd_usb2_set_bittiming; 1010 priv->can.do_set_mode = esd_usb2_set_mode; 1011 priv->can.do_get_berr_counter = esd_usb2_get_berr_counter; 1012 1013 netdev->flags |= IFF_ECHO; /* we support local echo */ 1014 1015 netdev->netdev_ops = &esd_usb2_netdev_ops; 1016 1017 SET_NETDEV_DEV(netdev, &intf->dev); 1018 1019 err = register_candev(netdev); 1020 if (err) { 1021 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err); 1022 free_candev(netdev); 1023 err = -ENOMEM; 1024 goto done; 1025 } 1026 1027 dev->nets[index] = priv; 1028 netdev_info(netdev, "device %s registered\n", netdev->name); 1029 1030done: 1031 return err; 1032} 1033 1034/* 1035 * probe function for new USB2 devices 1036 * 1037 * check version information and number of available 1038 * CAN interfaces 1039 */ 1040static int esd_usb2_probe(struct usb_interface *intf, 1041 const struct usb_device_id *id) 1042{ 1043 struct esd_usb2 *dev; 1044 struct esd_usb2_msg *msg; 1045 int i, err; 1046 1047 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 1048 if (!dev) { 1049 err = -ENOMEM; 1050 goto done; 1051 } 1052 1053 dev->udev = interface_to_usbdev(intf); 1054 1055 init_usb_anchor(&dev->rx_submitted); 1056 1057 usb_set_intfdata(intf, dev); 1058 1059 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 1060 if (!msg) { 1061 err = -ENOMEM; 1062 goto free_msg; 1063 } 1064 1065 /* query number of CAN interfaces (nets) */ 1066 msg->msg.hdr.cmd = CMD_VERSION; 1067 msg->msg.hdr.len = 2; 1068 msg->msg.version.rsvd = 0; 1069 msg->msg.version.flags = 0; 1070 msg->msg.version.drv_version = 0; 1071 1072 err = esd_usb2_send_msg(dev, msg); 1073 if (err < 0) { 1074 dev_err(&intf->dev, "sending version message failed\n"); 1075 goto free_msg; 1076 } 1077 1078 err = esd_usb2_wait_msg(dev, msg); 1079 if (err < 0) { 1080 dev_err(&intf->dev, "no version message answer\n"); 1081 goto free_msg; 1082 } 1083 1084 dev->net_count = (int)msg->msg.version_reply.nets; 1085 dev->version = le32_to_cpu(msg->msg.version_reply.version); 1086 1087 if (device_create_file(&intf->dev, &dev_attr_firmware)) 1088 dev_err(&intf->dev, 1089 "Couldn't create device file for firmware\n"); 1090 1091 if (device_create_file(&intf->dev, &dev_attr_hardware)) 1092 dev_err(&intf->dev, 1093 "Couldn't create device file for hardware\n"); 1094 1095 if (device_create_file(&intf->dev, &dev_attr_nets)) 1096 dev_err(&intf->dev, 1097 "Couldn't create device file for nets\n"); 1098 1099 /* do per device probing */ 1100 for (i = 0; i < dev->net_count; i++) 1101 esd_usb2_probe_one_net(intf, i); 1102 1103free_msg: 1104 kfree(msg); 1105 if (err) 1106 kfree(dev); 1107done: 1108 return err; 1109} 1110 1111/* 1112 * called by the usb core when the device is removed from the system 1113 */ 1114static void esd_usb2_disconnect(struct usb_interface *intf) 1115{ 1116 struct esd_usb2 *dev = usb_get_intfdata(intf); 1117 struct net_device *netdev; 1118 int i; 1119 1120 device_remove_file(&intf->dev, &dev_attr_firmware); 1121 device_remove_file(&intf->dev, &dev_attr_hardware); 1122 device_remove_file(&intf->dev, &dev_attr_nets); 1123 1124 usb_set_intfdata(intf, NULL); 1125 1126 if (dev) { 1127 for (i = 0; i < dev->net_count; i++) { 1128 if (dev->nets[i]) { 1129 netdev = dev->nets[i]->netdev; 1130 unregister_netdev(netdev); 1131 free_candev(netdev); 1132 } 1133 } 1134 unlink_all_urbs(dev); 1135 } 1136} 1137 1138/* usb specific object needed to register this driver with the usb subsystem */ 1139static struct usb_driver esd_usb2_driver = { 1140 .name = "esd_usb2", 1141 .probe = esd_usb2_probe, 1142 .disconnect = esd_usb2_disconnect, 1143 .id_table = esd_usb2_table, 1144}; 1145 1146module_usb_driver(esd_usb2_driver); 1147