esd_usb2.c revision 233a26e85f9a72bcd0cdb7a95d1d5abcd052369f
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 if (msg->msg.rx.net >= dev->net_count) { 416 dev_err(dev->udev->dev.parent, "format error\n"); 417 break; 418 } 419 420 esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg); 421 break; 422 423 case CMD_CAN_TX: 424 if (msg->msg.txdone.net >= dev->net_count) { 425 dev_err(dev->udev->dev.parent, "format error\n"); 426 break; 427 } 428 429 esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net], 430 msg); 431 break; 432 } 433 434 pos += msg->msg.hdr.len << 2; 435 436 if (pos > urb->actual_length) { 437 dev_err(dev->udev->dev.parent, "format error\n"); 438 break; 439 } 440 } 441 442resubmit_urb: 443 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1), 444 urb->transfer_buffer, RX_BUFFER_SIZE, 445 esd_usb2_read_bulk_callback, dev); 446 447 retval = usb_submit_urb(urb, GFP_ATOMIC); 448 if (retval == -ENODEV) { 449 for (i = 0; i < dev->net_count; i++) { 450 if (dev->nets[i]) 451 netif_device_detach(dev->nets[i]->netdev); 452 } 453 } else if (retval) { 454 dev_err(dev->udev->dev.parent, 455 "failed resubmitting read bulk urb: %d\n", retval); 456 } 457 458 return; 459} 460 461/* 462 * callback for bulk IN urb 463 */ 464static void esd_usb2_write_bulk_callback(struct urb *urb) 465{ 466 struct esd_tx_urb_context *context = urb->context; 467 struct esd_usb2_net_priv *priv; 468 struct esd_usb2 *dev; 469 struct net_device *netdev; 470 size_t size = sizeof(struct esd_usb2_msg); 471 472 WARN_ON(!context); 473 474 priv = context->priv; 475 netdev = priv->netdev; 476 dev = priv->usb2; 477 478 /* free up our allocated buffer */ 479 usb_free_coherent(urb->dev, size, 480 urb->transfer_buffer, urb->transfer_dma); 481 482 if (!netif_device_present(netdev)) 483 return; 484 485 if (urb->status) 486 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status); 487 488 netdev->trans_start = jiffies; 489} 490 491static ssize_t show_firmware(struct device *d, 492 struct device_attribute *attr, char *buf) 493{ 494 struct usb_interface *intf = to_usb_interface(d); 495 struct esd_usb2 *dev = usb_get_intfdata(intf); 496 497 return sprintf(buf, "%d.%d.%d\n", 498 (dev->version >> 12) & 0xf, 499 (dev->version >> 8) & 0xf, 500 dev->version & 0xff); 501} 502static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL); 503 504static ssize_t show_hardware(struct device *d, 505 struct device_attribute *attr, char *buf) 506{ 507 struct usb_interface *intf = to_usb_interface(d); 508 struct esd_usb2 *dev = usb_get_intfdata(intf); 509 510 return sprintf(buf, "%d.%d.%d\n", 511 (dev->version >> 28) & 0xf, 512 (dev->version >> 24) & 0xf, 513 (dev->version >> 16) & 0xff); 514} 515static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL); 516 517static ssize_t show_nets(struct device *d, 518 struct device_attribute *attr, char *buf) 519{ 520 struct usb_interface *intf = to_usb_interface(d); 521 struct esd_usb2 *dev = usb_get_intfdata(intf); 522 523 return sprintf(buf, "%d", dev->net_count); 524} 525static DEVICE_ATTR(nets, S_IRUGO, show_nets, NULL); 526 527static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg) 528{ 529 int actual_length; 530 531 return usb_bulk_msg(dev->udev, 532 usb_sndbulkpipe(dev->udev, 2), 533 msg, 534 msg->msg.hdr.len << 2, 535 &actual_length, 536 1000); 537} 538 539static int esd_usb2_wait_msg(struct esd_usb2 *dev, 540 struct esd_usb2_msg *msg) 541{ 542 int actual_length; 543 544 return usb_bulk_msg(dev->udev, 545 usb_rcvbulkpipe(dev->udev, 1), 546 msg, 547 sizeof(*msg), 548 &actual_length, 549 1000); 550} 551 552static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev) 553{ 554 int i, err = 0; 555 556 if (dev->rxinitdone) 557 return 0; 558 559 for (i = 0; i < MAX_RX_URBS; i++) { 560 struct urb *urb = NULL; 561 u8 *buf = NULL; 562 563 /* create a URB, and a buffer for it */ 564 urb = usb_alloc_urb(0, GFP_KERNEL); 565 if (!urb) { 566 dev_warn(dev->udev->dev.parent, 567 "No memory left for URBs\n"); 568 err = -ENOMEM; 569 break; 570 } 571 572 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, 573 &urb->transfer_dma); 574 if (!buf) { 575 dev_warn(dev->udev->dev.parent, 576 "No memory left for USB buffer\n"); 577 err = -ENOMEM; 578 goto freeurb; 579 } 580 581 usb_fill_bulk_urb(urb, dev->udev, 582 usb_rcvbulkpipe(dev->udev, 1), 583 buf, RX_BUFFER_SIZE, 584 esd_usb2_read_bulk_callback, dev); 585 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 586 usb_anchor_urb(urb, &dev->rx_submitted); 587 588 err = usb_submit_urb(urb, GFP_KERNEL); 589 if (err) { 590 usb_unanchor_urb(urb); 591 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, 592 urb->transfer_dma); 593 } 594 595freeurb: 596 /* Drop reference, USB core will take care of freeing it */ 597 usb_free_urb(urb); 598 if (err) 599 break; 600 } 601 602 /* Did we submit any URBs */ 603 if (i == 0) { 604 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n"); 605 return err; 606 } 607 608 /* Warn if we've couldn't transmit all the URBs */ 609 if (i < MAX_RX_URBS) { 610 dev_warn(dev->udev->dev.parent, 611 "rx performance may be slow\n"); 612 } 613 614 dev->rxinitdone = 1; 615 return 0; 616} 617 618/* 619 * Start interface 620 */ 621static int esd_usb2_start(struct esd_usb2_net_priv *priv) 622{ 623 struct esd_usb2 *dev = priv->usb2; 624 struct net_device *netdev = priv->netdev; 625 struct esd_usb2_msg *msg; 626 int err, i; 627 628 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 629 if (!msg) { 630 err = -ENOMEM; 631 goto out; 632 } 633 634 /* 635 * Enable all IDs 636 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits). 637 * Each bit represents one 11 bit CAN identifier. A set bit 638 * enables reception of the corresponding CAN identifier. A cleared 639 * bit disabled this identifier. An additional bitmask value 640 * following the CAN 2.0A bits is used to enable reception of 641 * extended CAN frames. Only the LSB of this final mask is checked 642 * for the complete 29 bit ID range. The IDADD message also allows 643 * filter configuration for an ID subset. In this case you can add 644 * the number of the starting bitmask (0..64) to the filter.option 645 * field followed by only some bitmasks. 646 */ 647 msg->msg.hdr.cmd = CMD_IDADD; 648 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 649 msg->msg.filter.net = priv->index; 650 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 651 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++) 652 msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff); 653 /* enable 29bit extended IDs */ 654 msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001); 655 656 err = esd_usb2_send_msg(dev, msg); 657 if (err) 658 goto out; 659 660 err = esd_usb2_setup_rx_urbs(dev); 661 if (err) 662 goto out; 663 664 priv->can.state = CAN_STATE_ERROR_ACTIVE; 665 666out: 667 if (err == -ENODEV) 668 netif_device_detach(netdev); 669 if (err) 670 netdev_err(netdev, "couldn't start device: %d\n", err); 671 672 kfree(msg); 673 return err; 674} 675 676static void unlink_all_urbs(struct esd_usb2 *dev) 677{ 678 struct esd_usb2_net_priv *priv; 679 int i, j; 680 681 usb_kill_anchored_urbs(&dev->rx_submitted); 682 for (i = 0; i < dev->net_count; i++) { 683 priv = dev->nets[i]; 684 if (priv) { 685 usb_kill_anchored_urbs(&priv->tx_submitted); 686 atomic_set(&priv->active_tx_jobs, 0); 687 688 for (j = 0; j < MAX_TX_URBS; j++) 689 priv->tx_contexts[j].echo_index = MAX_TX_URBS; 690 } 691 } 692} 693 694static int esd_usb2_open(struct net_device *netdev) 695{ 696 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 697 int err; 698 699 /* common open */ 700 err = open_candev(netdev); 701 if (err) 702 return err; 703 704 /* finally start device */ 705 err = esd_usb2_start(priv); 706 if (err) { 707 netdev_warn(netdev, "couldn't start device: %d\n", err); 708 close_candev(netdev); 709 return err; 710 } 711 712 netif_start_queue(netdev); 713 714 return 0; 715} 716 717static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb, 718 struct net_device *netdev) 719{ 720 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 721 struct esd_usb2 *dev = priv->usb2; 722 struct esd_tx_urb_context *context = NULL; 723 struct net_device_stats *stats = &netdev->stats; 724 struct can_frame *cf = (struct can_frame *)skb->data; 725 struct esd_usb2_msg *msg; 726 struct urb *urb; 727 u8 *buf; 728 int i, err; 729 int ret = NETDEV_TX_OK; 730 size_t size = sizeof(struct esd_usb2_msg); 731 732 if (can_dropped_invalid_skb(netdev, skb)) 733 return NETDEV_TX_OK; 734 735 /* create a URB, and a buffer for it, and copy the data to the URB */ 736 urb = usb_alloc_urb(0, GFP_ATOMIC); 737 if (!urb) { 738 netdev_err(netdev, "No memory left for URBs\n"); 739 stats->tx_dropped++; 740 dev_kfree_skb(skb); 741 goto nourbmem; 742 } 743 744 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, 745 &urb->transfer_dma); 746 if (!buf) { 747 netdev_err(netdev, "No memory left for USB buffer\n"); 748 stats->tx_dropped++; 749 dev_kfree_skb(skb); 750 goto nobufmem; 751 } 752 753 msg = (struct esd_usb2_msg *)buf; 754 755 msg->msg.hdr.len = 3; /* minimal length */ 756 msg->msg.hdr.cmd = CMD_CAN_TX; 757 msg->msg.tx.net = priv->index; 758 msg->msg.tx.dlc = cf->can_dlc; 759 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); 760 761 if (cf->can_id & CAN_RTR_FLAG) 762 msg->msg.tx.dlc |= ESD_RTR; 763 764 if (cf->can_id & CAN_EFF_FLAG) 765 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID); 766 767 for (i = 0; i < cf->can_dlc; i++) 768 msg->msg.tx.data[i] = cf->data[i]; 769 770 msg->msg.hdr.len += (cf->can_dlc + 3) >> 2; 771 772 for (i = 0; i < MAX_TX_URBS; i++) { 773 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { 774 context = &priv->tx_contexts[i]; 775 break; 776 } 777 } 778 779 /* 780 * This may never happen. 781 */ 782 if (!context) { 783 netdev_warn(netdev, "couldn't find free context\n"); 784 ret = NETDEV_TX_BUSY; 785 goto releasebuf; 786 } 787 788 context->priv = priv; 789 context->echo_index = i; 790 context->dlc = cf->can_dlc; 791 792 /* hnd must not be 0 - MSB is stripped in txdone handling */ 793 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */ 794 795 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, 796 msg->msg.hdr.len << 2, 797 esd_usb2_write_bulk_callback, context); 798 799 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 800 801 usb_anchor_urb(urb, &priv->tx_submitted); 802 803 can_put_echo_skb(skb, netdev, context->echo_index); 804 805 atomic_inc(&priv->active_tx_jobs); 806 807 /* Slow down tx path */ 808 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS) 809 netif_stop_queue(netdev); 810 811 err = usb_submit_urb(urb, GFP_ATOMIC); 812 if (err) { 813 can_free_echo_skb(netdev, context->echo_index); 814 815 atomic_dec(&priv->active_tx_jobs); 816 usb_unanchor_urb(urb); 817 818 stats->tx_dropped++; 819 820 if (err == -ENODEV) 821 netif_device_detach(netdev); 822 else 823 netdev_warn(netdev, "failed tx_urb %d\n", err); 824 825 goto releasebuf; 826 } 827 828 netdev->trans_start = jiffies; 829 830 /* 831 * Release our reference to this URB, the USB core will eventually free 832 * it entirely. 833 */ 834 usb_free_urb(urb); 835 836 return NETDEV_TX_OK; 837 838releasebuf: 839 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); 840 841nobufmem: 842 usb_free_urb(urb); 843 844nourbmem: 845 return ret; 846} 847 848static int esd_usb2_close(struct net_device *netdev) 849{ 850 struct esd_usb2_net_priv *priv = netdev_priv(netdev); 851 struct esd_usb2_msg *msg; 852 int i; 853 854 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 855 if (!msg) 856 return -ENOMEM; 857 858 /* Disable all IDs (see esd_usb2_start()) */ 859 msg->msg.hdr.cmd = CMD_IDADD; 860 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; 861 msg->msg.filter.net = priv->index; 862 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ 863 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++) 864 msg->msg.filter.mask[i] = 0; 865 if (esd_usb2_send_msg(priv->usb2, msg) < 0) 866 netdev_err(netdev, "sending idadd message failed\n"); 867 868 /* set CAN controller to reset mode */ 869 msg->msg.hdr.len = 2; 870 msg->msg.hdr.cmd = CMD_SETBAUD; 871 msg->msg.setbaud.net = priv->index; 872 msg->msg.setbaud.rsvd = 0; 873 msg->msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE); 874 if (esd_usb2_send_msg(priv->usb2, msg) < 0) 875 netdev_err(netdev, "sending setbaud message failed\n"); 876 877 priv->can.state = CAN_STATE_STOPPED; 878 879 netif_stop_queue(netdev); 880 881 close_candev(netdev); 882 883 kfree(msg); 884 885 return 0; 886} 887 888static const struct net_device_ops esd_usb2_netdev_ops = { 889 .ndo_open = esd_usb2_open, 890 .ndo_stop = esd_usb2_close, 891 .ndo_start_xmit = esd_usb2_start_xmit, 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 1029 err = register_candev(netdev); 1030 if (err) { 1031 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err); 1032 free_candev(netdev); 1033 err = -ENOMEM; 1034 goto done; 1035 } 1036 1037 dev->nets[index] = priv; 1038 netdev_info(netdev, "device %s registered\n", netdev->name); 1039 1040done: 1041 return err; 1042} 1043 1044/* 1045 * probe function for new USB2 devices 1046 * 1047 * check version information and number of available 1048 * CAN interfaces 1049 */ 1050static int esd_usb2_probe(struct usb_interface *intf, 1051 const struct usb_device_id *id) 1052{ 1053 struct esd_usb2 *dev; 1054 struct esd_usb2_msg *msg; 1055 int i, err; 1056 1057 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 1058 if (!dev) { 1059 err = -ENOMEM; 1060 goto done; 1061 } 1062 1063 dev->udev = interface_to_usbdev(intf); 1064 1065 init_usb_anchor(&dev->rx_submitted); 1066 1067 usb_set_intfdata(intf, dev); 1068 1069 msg = kmalloc(sizeof(*msg), GFP_KERNEL); 1070 if (!msg) { 1071 err = -ENOMEM; 1072 goto free_msg; 1073 } 1074 1075 /* query number of CAN interfaces (nets) */ 1076 msg->msg.hdr.cmd = CMD_VERSION; 1077 msg->msg.hdr.len = 2; 1078 msg->msg.version.rsvd = 0; 1079 msg->msg.version.flags = 0; 1080 msg->msg.version.drv_version = 0; 1081 1082 err = esd_usb2_send_msg(dev, msg); 1083 if (err < 0) { 1084 dev_err(&intf->dev, "sending version message failed\n"); 1085 goto free_msg; 1086 } 1087 1088 err = esd_usb2_wait_msg(dev, msg); 1089 if (err < 0) { 1090 dev_err(&intf->dev, "no version message answer\n"); 1091 goto free_msg; 1092 } 1093 1094 dev->net_count = (int)msg->msg.version_reply.nets; 1095 dev->version = le32_to_cpu(msg->msg.version_reply.version); 1096 1097 if (device_create_file(&intf->dev, &dev_attr_firmware)) 1098 dev_err(&intf->dev, 1099 "Couldn't create device file for firmware\n"); 1100 1101 if (device_create_file(&intf->dev, &dev_attr_hardware)) 1102 dev_err(&intf->dev, 1103 "Couldn't create device file for hardware\n"); 1104 1105 if (device_create_file(&intf->dev, &dev_attr_nets)) 1106 dev_err(&intf->dev, 1107 "Couldn't create device file for nets\n"); 1108 1109 /* do per device probing */ 1110 for (i = 0; i < dev->net_count; i++) 1111 esd_usb2_probe_one_net(intf, i); 1112 1113free_msg: 1114 kfree(msg); 1115 if (err) 1116 kfree(dev); 1117done: 1118 return err; 1119} 1120 1121/* 1122 * called by the usb core when the device is removed from the system 1123 */ 1124static void esd_usb2_disconnect(struct usb_interface *intf) 1125{ 1126 struct esd_usb2 *dev = usb_get_intfdata(intf); 1127 struct net_device *netdev; 1128 int i; 1129 1130 device_remove_file(&intf->dev, &dev_attr_firmware); 1131 device_remove_file(&intf->dev, &dev_attr_hardware); 1132 device_remove_file(&intf->dev, &dev_attr_nets); 1133 1134 usb_set_intfdata(intf, NULL); 1135 1136 if (dev) { 1137 for (i = 0; i < dev->net_count; i++) { 1138 if (dev->nets[i]) { 1139 netdev = dev->nets[i]->netdev; 1140 unregister_netdev(netdev); 1141 free_candev(netdev); 1142 } 1143 } 1144 unlink_all_urbs(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