drivers/net/can/usb/esd_usb2.c

   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
  29 MODULE_AUTHOR("Matthias Fuchs <matthias.fuchs@esd.eu>");
  30 MODULE_DESCRIPTION("CAN driver for esd CAN-USB/2 and CAN-USB/Micro interfaces");
  31 MODULE_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
 102 struct header_msg {
 103         u8 len; /* len is always the total message length in 32bit words */
 104         u8 cmd;
 105         u8 rsvd[2];
 106 };
 107
 108 struct version_msg {
 109         u8 len;
 110         u8 cmd;
 111         u8 rsvd;
 112         u8 flags;
 113         __le32 drv_version;
 114 };
 115
 116 struct 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
 127 struct 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
 137 struct tx_msg {
 138         u8 len;
 139         u8 cmd;
 140         u8 net;
 141         u8 dlc;
 142         u32 hnd;        /* opaque handle, not used by device */
 143         __le32 id; /* upper 3 bits contain flags */
 144         u8 data[8];
 145 };
 146
 147 struct tx_done_msg {
 148         u8 len;
 149         u8 cmd;
 150         u8 net;
 151         u8 status;
 152         u32 hnd;        /* opaque handle, not used by device */
 153         __le32 ts;
 154 };
 155
 156 struct 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
 164 struct 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 */
 173 struct __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
 186 static 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 };
 191 MODULE_DEVICE_TABLE(usb, esd_usb2_table);
 192
 193 struct esd_usb2_net_priv;
 194
 195 struct esd_tx_urb_context {
 196         struct esd_usb2_net_priv *priv;
 197         u32 echo_index;
 198         int dlc;
 199 };
 200
 201 struct 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
 212 struct 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
 226 static 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                                 priv->can.can_stats.bus_off++;
 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[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                 priv->bec.txerr = txerr;
 304                 priv->bec.rxerr = rxerr;
 305
 306                 stats->rx_packets++;
 307                 stats->rx_bytes += cf->can_dlc;
 308                 netif_rx(skb);
 309         }
 310 }
 311
 312 static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv,
 313                                 struct esd_usb2_msg *msg)
 314 {
 315         struct net_device_stats *stats = &priv->netdev->stats;
 316         struct can_frame *cf;
 317         struct sk_buff *skb;
 318         int i;
 319         u32 id;
 320
 321         if (!netif_device_present(priv->netdev))
 322                 return;
 323
 324         id = le32_to_cpu(msg->msg.rx.id);
 325
 326         if (id & ESD_EVENT) {
 327                 esd_usb2_rx_event(priv, msg);
 328         } else {
 329                 skb = alloc_can_skb(priv->netdev, &cf);
 330                 if (skb == NULL) {
 331                         stats->rx_dropped++;
 332                         return;
 333                 }
 334
 335                 cf->can_id = id & ESD_IDMASK;
 336                 cf->can_dlc = get_can_dlc(msg->msg.rx.dlc);
 337
 338                 if (id & ESD_EXTID)
 339                         cf->can_id |= CAN_EFF_FLAG;
 340
 341                 if (msg->msg.rx.dlc & ESD_RTR) {
 342                         cf->can_id |= CAN_RTR_FLAG;
 343                 } else {
 344                         for (i = 0; i < cf->can_dlc; i++)
 345                                 cf->data[i] = msg->msg.rx.data[i];
 346                 }
 347
 348                 stats->rx_packets++;
 349                 stats->rx_bytes += cf->can_dlc;
 350                 netif_rx(skb);
 351         }
 352
 353         return;
 354 }
 355
 356 static void esd_usb2_tx_done_msg(struct esd_usb2_net_priv *priv,
 357                                  struct esd_usb2_msg *msg)
 358 {
 359         struct net_device_stats *stats = &priv->netdev->stats;
 360         struct net_device *netdev = priv->netdev;
 361         struct esd_tx_urb_context *context;
 362
 363         if (!netif_device_present(netdev))
 364                 return;
 365
 366         context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)];
 367
 368         if (!msg->msg.txdone.status) {
 369                 stats->tx_packets++;
 370                 stats->tx_bytes += context->dlc;
 371                 can_get_echo_skb(netdev, context->echo_index);
 372         } else {
 373                 stats->tx_errors++;
 374                 can_free_echo_skb(netdev, context->echo_index);
 375         }
 376
 377         /* Release context */
 378         context->echo_index = MAX_TX_URBS;
 379         atomic_dec(&priv->active_tx_jobs);
 380
 381         netif_wake_queue(netdev);
 382 }
 383
 384 static void esd_usb2_read_bulk_callback(struct urb *urb)
 385 {
 386         struct esd_usb2 *dev = urb->context;
 387         int retval;
 388         int pos = 0;
 389         int i;
 390
 391         switch (urb->status) {
 392         case 0: /* success */
 393                 break;
 394
 395         case -ENOENT:
 396         case -ESHUTDOWN:
 397                 return;
 398
 399         default:
 400                 dev_info(dev->udev->dev.parent,
 401                          "Rx URB aborted (%d)\n", urb->status);
 402                 goto resubmit_urb;
 403         }
 404
 405         while (pos < urb->actual_length) {
 406                 struct esd_usb2_msg *msg;
 407
 408                 msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos);
 409
 410                 switch (msg->msg.hdr.cmd) {
 411                 case CMD_CAN_RX:
 412                         if (msg->msg.rx.net >= dev->net_count) {
 413                                 dev_err(dev->udev->dev.parent, "format error\n");
 414                                 break;
 415                         }
 416
 417                         esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg);
 418                         break;
 419
 420                 case CMD_CAN_TX:
 421                         if (msg->msg.txdone.net >= dev->net_count) {
 422                                 dev_err(dev->udev->dev.parent, "format error\n");
 423                                 break;
 424                         }
 425
 426                         esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net],
 427                                              msg);
 428                         break;
 429                 }
 430
 431                 pos += msg->msg.hdr.len << 2;
 432
 433                 if (pos > urb->actual_length) {
 434                         dev_err(dev->udev->dev.parent, "format error\n");
 435                         break;
 436                 }
 437         }
 438
 439 resubmit_urb:
 440         usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
 441                           urb->transfer_buffer, RX_BUFFER_SIZE,
 442                           esd_usb2_read_bulk_callback, dev);
 443
 444         retval = usb_submit_urb(urb, GFP_ATOMIC);
 445         if (retval == -ENODEV) {
 446                 for (i = 0; i < dev->net_count; i++) {
 447                         if (dev->nets[i])
 448                                 netif_device_detach(dev->nets[i]->netdev);
 449                 }
 450         } else if (retval) {
 451                 dev_err(dev->udev->dev.parent,
 452                         "failed resubmitting read bulk urb: %d\n", retval);
 453         }
 454
 455         return;
 456 }
 457
 458 /*
 459  * callback for bulk IN urb
 460  */
 461 static void esd_usb2_write_bulk_callback(struct urb *urb)
 462 {
 463         struct esd_tx_urb_context *context = urb->context;
 464         struct esd_usb2_net_priv *priv;
 465         struct net_device *netdev;
 466         size_t size = sizeof(struct esd_usb2_msg);
 467
 468         WARN_ON(!context);
 469
 470         priv = context->priv;
 471         netdev = priv->netdev;
 472
 473         /* free up our allocated buffer */
 474         usb_free_coherent(urb->dev, size,
 475                           urb->transfer_buffer, urb->transfer_dma);
 476
 477         if (!netif_device_present(netdev))
 478                 return;
 479
 480         if (urb->status)
 481                 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
 482
 483         netif_trans_update(netdev);
 484 }
 485
 486 static ssize_t show_firmware(struct device *d,
 487                              struct device_attribute *attr, char *buf)
 488 {
 489         struct usb_interface *intf = to_usb_interface(d);
 490         struct esd_usb2 *dev = usb_get_intfdata(intf);
 491
 492         return sprintf(buf, "%d.%d.%d\n",
 493                        (dev->version >> 12) & 0xf,
 494                        (dev->version >> 8) & 0xf,
 495                        dev->version & 0xff);
 496 }
 497 static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL);
 498
 499 static ssize_t show_hardware(struct device *d,
 500                              struct device_attribute *attr, char *buf)
 501 {
 502         struct usb_interface *intf = to_usb_interface(d);
 503         struct esd_usb2 *dev = usb_get_intfdata(intf);
 504
 505         return sprintf(buf, "%d.%d.%d\n",
 506                        (dev->version >> 28) & 0xf,
 507                        (dev->version >> 24) & 0xf,
 508                        (dev->version >> 16) & 0xff);
 509 }
 510 static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL);
 511
 512 static ssize_t show_nets(struct device *d,
 513                          struct device_attribute *attr, char *buf)
 514 {
 515         struct usb_interface *intf = to_usb_interface(d);
 516         struct esd_usb2 *dev = usb_get_intfdata(intf);
 517
 518         return sprintf(buf, "%d", dev->net_count);
 519 }
 520 static DEVICE_ATTR(nets, S_IRUGO, show_nets, NULL);
 521
 522 static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg)
 523 {
 524         int actual_length;
 525
 526         return usb_bulk_msg(dev->udev,
 527                             usb_sndbulkpipe(dev->udev, 2),
 528                             msg,
 529                             msg->msg.hdr.len << 2,
 530                             &actual_length,
 531                             1000);
 532 }
 533
 534 static int esd_usb2_wait_msg(struct esd_usb2 *dev,
 535                              struct esd_usb2_msg *msg)
 536 {
 537         int actual_length;
 538
 539         return usb_bulk_msg(dev->udev,
 540                             usb_rcvbulkpipe(dev->udev, 1),
 541                             msg,
 542                             sizeof(*msg),
 543                             &actual_length,
 544                             1000);
 545 }
 546
 547 static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev)
 548 {
 549         int i, err = 0;
 550
 551         if (dev->rxinitdone)
 552                 return 0;
 553
 554         for (i = 0; i < MAX_RX_URBS; i++) {
 555                 struct urb *urb = NULL;
 556                 u8 *buf = NULL;
 557
 558                 /* create a URB, and a buffer for it */
 559                 urb = usb_alloc_urb(0, GFP_KERNEL);
 560                 if (!urb) {
 561                         dev_warn(dev->udev->dev.parent,
 562                                  "No memory left for URBs\n");
 563                         err = -ENOMEM;
 564                         break;
 565                 }
 566
 567                 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL,
 568                                          &urb->transfer_dma);
 569                 if (!buf) {
 570                         dev_warn(dev->udev->dev.parent,
 571                                  "No memory left for USB buffer\n");
 572                         err = -ENOMEM;
 573                         goto freeurb;
 574                 }
 575
 576                 usb_fill_bulk_urb(urb, dev->udev,
 577                                   usb_rcvbulkpipe(dev->udev, 1),
 578                                   buf, RX_BUFFER_SIZE,
 579                                   esd_usb2_read_bulk_callback, dev);
 580                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 581                 usb_anchor_urb(urb, &dev->rx_submitted);
 582
 583                 err = usb_submit_urb(urb, GFP_KERNEL);
 584                 if (err) {
 585                         usb_unanchor_urb(urb);
 586                         usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
 587                                           urb->transfer_dma);
 588                 }
 589
 590 freeurb:
 591                 /* Drop reference, USB core will take care of freeing it */
 592                 usb_free_urb(urb);
 593                 if (err)
 594                         break;
 595         }
 596
 597         /* Did we submit any URBs */
 598         if (i == 0) {
 599                 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n");
 600                 return err;
 601         }
 602
 603         /* Warn if we've couldn't transmit all the URBs */
 604         if (i < MAX_RX_URBS) {
 605                 dev_warn(dev->udev->dev.parent,
 606                          "rx performance may be slow\n");
 607         }
 608
 609         dev->rxinitdone = 1;
 610         return 0;
 611 }
 612
 613 /*
 614  * Start interface
 615  */
 616 static int esd_usb2_start(struct esd_usb2_net_priv *priv)
 617 {
 618         struct esd_usb2 *dev = priv->usb2;
 619         struct net_device *netdev = priv->netdev;
 620         struct esd_usb2_msg *msg;
 621         int err, i;
 622
 623         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
 624         if (!msg) {
 625                 err = -ENOMEM;
 626                 goto out;
 627         }
 628
 629         /*
 630          * Enable all IDs
 631          * The IDADD message takes up to 64 32 bit bitmasks (2048 bits).
 632          * Each bit represents one 11 bit CAN identifier. A set bit
 633          * enables reception of the corresponding CAN identifier. A cleared
 634          * bit disabled this identifier. An additional bitmask value
 635          * following the CAN 2.0A bits is used to enable reception of
 636          * extended CAN frames. Only the LSB of this final mask is checked
 637          * for the complete 29 bit ID range. The IDADD message also allows
 638          * filter configuration for an ID subset. In this case you can add
 639          * the number of the starting bitmask (0..64) to the filter.option
 640          * field followed by only some bitmasks.
 641          */
 642         msg->msg.hdr.cmd = CMD_IDADD;
 643         msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
 644         msg->msg.filter.net = priv->index;
 645         msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
 646         for (i = 0; i < ESD_MAX_ID_SEGMENT; i++)
 647                 msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff);
 648         /* enable 29bit extended IDs */
 649         msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001);
 650
 651         err = esd_usb2_send_msg(dev, msg);
 652         if (err)
 653                 goto out;
 654
 655         err = esd_usb2_setup_rx_urbs(dev);
 656         if (err)
 657                 goto out;
 658
 659         priv->can.state = CAN_STATE_ERROR_ACTIVE;
 660
 661 out:
 662         if (err == -ENODEV)
 663                 netif_device_detach(netdev);
 664         if (err)
 665                 netdev_err(netdev, "couldn't start device: %d\n", err);
 666
 667         kfree(msg);
 668         return err;
 669 }
 670
 671 static void unlink_all_urbs(struct esd_usb2 *dev)
 672 {
 673         struct esd_usb2_net_priv *priv;
 674         int i, j;
 675
 676         usb_kill_anchored_urbs(&dev->rx_submitted);
 677         for (i = 0; i < dev->net_count; i++) {
 678                 priv = dev->nets[i];
 679                 if (priv) {
 680                         usb_kill_anchored_urbs(&priv->tx_submitted);
 681                         atomic_set(&priv->active_tx_jobs, 0);
 682
 683                         for (j = 0; j < MAX_TX_URBS; j++)
 684                                 priv->tx_contexts[j].echo_index = MAX_TX_URBS;
 685                 }
 686         }
 687 }
 688
 689 static int esd_usb2_open(struct net_device *netdev)
 690 {
 691         struct esd_usb2_net_priv *priv = netdev_priv(netdev);
 692         int err;
 693
 694         /* common open */
 695         err = open_candev(netdev);
 696         if (err)
 697                 return err;
 698
 699         /* finally start device */
 700         err = esd_usb2_start(priv);
 701         if (err) {
 702                 netdev_warn(netdev, "couldn't start device: %d\n", err);
 703                 close_candev(netdev);
 704                 return err;
 705         }
 706
 707         netif_start_queue(netdev);
 708
 709         return 0;
 710 }
 711
 712 static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb,
 713                                       struct net_device *netdev)
 714 {
 715         struct esd_usb2_net_priv *priv = netdev_priv(netdev);
 716         struct esd_usb2 *dev = priv->usb2;
 717         struct esd_tx_urb_context *context = NULL;
 718         struct net_device_stats *stats = &netdev->stats;
 719         struct can_frame *cf = (struct can_frame *)skb->data;
 720         struct esd_usb2_msg *msg;
 721         struct urb *urb;
 722         u8 *buf;
 723         int i, err;
 724         int ret = NETDEV_TX_OK;
 725         size_t size = sizeof(struct esd_usb2_msg);
 726
 727         if (can_dropped_invalid_skb(netdev, skb))
 728                 return NETDEV_TX_OK;
 729
 730         /* create a URB, and a buffer for it, and copy the data to the URB */
 731         urb = usb_alloc_urb(0, GFP_ATOMIC);
 732         if (!urb) {
 733                 netdev_err(netdev, "No memory left for URBs\n");
 734                 stats->tx_dropped++;
 735                 dev_kfree_skb(skb);
 736                 goto nourbmem;
 737         }
 738
 739         buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC,
 740                                  &urb->transfer_dma);
 741         if (!buf) {
 742                 netdev_err(netdev, "No memory left for USB buffer\n");
 743                 stats->tx_dropped++;
 744                 dev_kfree_skb(skb);
 745                 goto nobufmem;
 746         }
 747
 748         msg = (struct esd_usb2_msg *)buf;
 749
 750         msg->msg.hdr.len = 3; /* minimal length */
 751         msg->msg.hdr.cmd = CMD_CAN_TX;
 752         msg->msg.tx.net = priv->index;
 753         msg->msg.tx.dlc = cf->can_dlc;
 754         msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK);
 755
 756         if (cf->can_id & CAN_RTR_FLAG)
 757                 msg->msg.tx.dlc |= ESD_RTR;
 758
 759         if (cf->can_id & CAN_EFF_FLAG)
 760                 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID);
 761
 762         for (i = 0; i < cf->can_dlc; i++)
 763                 msg->msg.tx.data[i] = cf->data[i];
 764
 765         msg->msg.hdr.len += (cf->can_dlc + 3) >> 2;
 766
 767         for (i = 0; i < MAX_TX_URBS; i++) {
 768                 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
 769                         context = &priv->tx_contexts[i];
 770                         break;
 771                 }
 772         }
 773
 774         /*
 775          * This may never happen.
 776          */
 777         if (!context) {
 778                 netdev_warn(netdev, "couldn't find free context\n");
 779                 ret = NETDEV_TX_BUSY;
 780                 goto releasebuf;
 781         }
 782
 783         context->priv = priv;
 784         context->echo_index = i;
 785         context->dlc = cf->can_dlc;
 786
 787         /* hnd must not be 0 - MSB is stripped in txdone handling */
 788         msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */
 789
 790         usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
 791                           msg->msg.hdr.len << 2,
 792                           esd_usb2_write_bulk_callback, context);
 793
 794         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 795
 796         usb_anchor_urb(urb, &priv->tx_submitted);
 797
 798         can_put_echo_skb(skb, netdev, context->echo_index);
 799
 800         atomic_inc(&priv->active_tx_jobs);
 801
 802         /* Slow down tx path */
 803         if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS)
 804                 netif_stop_queue(netdev);
 805
 806         err = usb_submit_urb(urb, GFP_ATOMIC);
 807         if (err) {
 808                 can_free_echo_skb(netdev, context->echo_index);
 809
 810                 atomic_dec(&priv->active_tx_jobs);
 811                 usb_unanchor_urb(urb);
 812
 813                 stats->tx_dropped++;
 814
 815                 if (err == -ENODEV)
 816                         netif_device_detach(netdev);
 817                 else
 818                         netdev_warn(netdev, "failed tx_urb %d\n", err);
 819
 820                 goto releasebuf;
 821         }
 822
 823         netif_trans_update(netdev);
 824
 825         /*
 826          * Release our reference to this URB, the USB core will eventually free
 827          * it entirely.
 828          */
 829         usb_free_urb(urb);
 830
 831         return NETDEV_TX_OK;
 832
 833 releasebuf:
 834         usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
 835
 836 nobufmem:
 837         usb_free_urb(urb);
 838
 839 nourbmem:
 840         return ret;
 841 }
 842
 843 static int esd_usb2_close(struct net_device *netdev)
 844 {
 845         struct esd_usb2_net_priv *priv = netdev_priv(netdev);
 846         struct esd_usb2_msg *msg;
 847         int i;
 848
 849         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
 850         if (!msg)
 851                 return -ENOMEM;
 852
 853         /* Disable all IDs (see esd_usb2_start()) */
 854         msg->msg.hdr.cmd = CMD_IDADD;
 855         msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
 856         msg->msg.filter.net = priv->index;
 857         msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
 858         for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++)
 859                 msg->msg.filter.mask[i] = 0;
 860         if (esd_usb2_send_msg(priv->usb2, msg) < 0)
 861                 netdev_err(netdev, "sending idadd message failed\n");
 862
 863         /* set CAN controller to reset mode */
 864         msg->msg.hdr.len = 2;
 865         msg->msg.hdr.cmd = CMD_SETBAUD;
 866         msg->msg.setbaud.net = priv->index;
 867         msg->msg.setbaud.rsvd = 0;
 868         msg->msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE);
 869         if (esd_usb2_send_msg(priv->usb2, msg) < 0)
 870                 netdev_err(netdev, "sending setbaud message failed\n");
 871
 872         priv->can.state = CAN_STATE_STOPPED;
 873
 874         netif_stop_queue(netdev);
 875
 876         close_candev(netdev);
 877
 878         kfree(msg);
 879
 880         return 0;
 881 }
 882
 883 static const struct net_device_ops esd_usb2_netdev_ops = {
 884         .ndo_open = esd_usb2_open,
 885         .ndo_stop = esd_usb2_close,
 886         .ndo_start_xmit = esd_usb2_start_xmit,
 887         .ndo_change_mtu = can_change_mtu,
 888 };
 889
 890 static const struct can_bittiming_const esd_usb2_bittiming_const = {
 891         .name = "esd_usb2",
 892         .tseg1_min = ESD_USB2_TSEG1_MIN,
 893         .tseg1_max = ESD_USB2_TSEG1_MAX,
 894         .tseg2_min = ESD_USB2_TSEG2_MIN,
 895         .tseg2_max = ESD_USB2_TSEG2_MAX,
 896         .sjw_max = ESD_USB2_SJW_MAX,
 897         .brp_min = ESD_USB2_BRP_MIN,
 898         .brp_max = ESD_USB2_BRP_MAX,
 899         .brp_inc = ESD_USB2_BRP_INC,
 900 };
 901
 902 static int esd_usb2_set_bittiming(struct net_device *netdev)
 903 {
 904         struct esd_usb2_net_priv *priv = netdev_priv(netdev);
 905         struct can_bittiming *bt = &priv->can.bittiming;
 906         struct esd_usb2_msg *msg;
 907         int err;
 908         u32 canbtr;
 909         int sjw_shift;
 910
 911         canbtr = ESD_USB2_UBR;
 912         if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
 913                 canbtr |= ESD_USB2_LOM;
 914
 915         canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1);
 916
 917         if (le16_to_cpu(priv->usb2->udev->descriptor.idProduct) ==
 918             USB_CANUSBM_PRODUCT_ID)
 919                 sjw_shift = ESD_USBM_SJW_SHIFT;
 920         else
 921                 sjw_shift = ESD_USB2_SJW_SHIFT;
 922
 923         canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1))
 924                 << sjw_shift;
 925         canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1)
 926                    & (ESD_USB2_TSEG1_MAX - 1))
 927                 << ESD_USB2_TSEG1_SHIFT;
 928         canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1))
 929                 << ESD_USB2_TSEG2_SHIFT;
 930         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
 931                 canbtr |= ESD_USB2_3_SAMPLES;
 932
 933         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
 934         if (!msg)
 935                 return -ENOMEM;
 936
 937         msg->msg.hdr.len = 2;
 938         msg->msg.hdr.cmd = CMD_SETBAUD;
 939         msg->msg.setbaud.net = priv->index;
 940         msg->msg.setbaud.rsvd = 0;
 941         msg->msg.setbaud.baud = cpu_to_le32(canbtr);
 942
 943         netdev_info(netdev, "setting BTR=%#x\n", canbtr);
 944
 945         err = esd_usb2_send_msg(priv->usb2, msg);
 946
 947         kfree(msg);
 948         return err;
 949 }
 950
 951 static int esd_usb2_get_berr_counter(const struct net_device *netdev,
 952                                      struct can_berr_counter *bec)
 953 {
 954         struct esd_usb2_net_priv *priv = netdev_priv(netdev);
 955
 956         bec->txerr = priv->bec.txerr;
 957         bec->rxerr = priv->bec.rxerr;
 958
 959         return 0;
 960 }
 961
 962 static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode)
 963 {
 964         switch (mode) {
 965         case CAN_MODE_START:
 966                 netif_wake_queue(netdev);
 967                 break;
 968
 969         default:
 970                 return -EOPNOTSUPP;
 971         }
 972
 973         return 0;
 974 }
 975
 976 static int esd_usb2_probe_one_net(struct usb_interface *intf, int index)
 977 {
 978         struct esd_usb2 *dev = usb_get_intfdata(intf);
 979         struct net_device *netdev;
 980         struct esd_usb2_net_priv *priv;
 981         int err = 0;
 982         int i;
 983
 984         netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
 985         if (!netdev) {
 986                 dev_err(&intf->dev, "couldn't alloc candev\n");
 987                 err = -ENOMEM;
 988                 goto done;
 989         }
 990
 991         priv = netdev_priv(netdev);
 992
 993         init_usb_anchor(&priv->tx_submitted);
 994         atomic_set(&priv->active_tx_jobs, 0);
 995
 996         for (i = 0; i < MAX_TX_URBS; i++)
 997                 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
 998
 999         priv->usb2 = dev;
1000         priv->netdev = netdev;
1001         priv->index = index;
1002
1003         priv->can.state = CAN_STATE_STOPPED;
1004         priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY;
1005
1006         if (le16_to_cpu(dev->udev->descriptor.idProduct) ==
1007             USB_CANUSBM_PRODUCT_ID)
1008                 priv->can.clock.freq = ESD_USBM_CAN_CLOCK;
1009         else {
1010                 priv->can.clock.freq = ESD_USB2_CAN_CLOCK;
1011                 priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
1012         }
1013
1014         priv->can.bittiming_const = &esd_usb2_bittiming_const;
1015         priv->can.do_set_bittiming = esd_usb2_set_bittiming;
1016         priv->can.do_set_mode = esd_usb2_set_mode;
1017         priv->can.do_get_berr_counter = esd_usb2_get_berr_counter;
1018
1019         netdev->flags |= IFF_ECHO; /* we support local echo */
1020
1021         netdev->netdev_ops = &esd_usb2_netdev_ops;
1022
1023         SET_NETDEV_DEV(netdev, &intf->dev);
1024         netdev->dev_id = index;
1025
1026         err = register_candev(netdev);
1027         if (err) {
1028                 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err);
1029                 free_candev(netdev);
1030                 err = -ENOMEM;
1031                 goto done;
1032         }
1033
1034         dev->nets[index] = priv;
1035         netdev_info(netdev, "device %s registered\n", netdev->name);
1036
1037 done:
1038         return err;
1039 }
1040
1041 /*
1042  * probe function for new USB2 devices
1043  *
1044  * check version information and number of available
1045  * CAN interfaces
1046  */
1047 static int esd_usb2_probe(struct usb_interface *intf,
1048                          const struct usb_device_id *id)
1049 {
1050         struct esd_usb2 *dev;
1051         struct esd_usb2_msg *msg;
1052         int i, err;
1053
1054         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1055         if (!dev) {
1056                 err = -ENOMEM;
1057                 goto done;
1058         }
1059
1060         dev->udev = interface_to_usbdev(intf);
1061
1062         init_usb_anchor(&dev->rx_submitted);
1063
1064         usb_set_intfdata(intf, dev);
1065
1066         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1067         if (!msg) {
1068                 err = -ENOMEM;
1069                 goto free_msg;
1070         }
1071
1072         /* query number of CAN interfaces (nets) */
1073         msg->msg.hdr.cmd = CMD_VERSION;
1074         msg->msg.hdr.len = 2;
1075         msg->msg.version.rsvd = 0;
1076         msg->msg.version.flags = 0;
1077         msg->msg.version.drv_version = 0;
1078
1079         err = esd_usb2_send_msg(dev, msg);
1080         if (err < 0) {
1081                 dev_err(&intf->dev, "sending version message failed\n");
1082                 goto free_msg;
1083         }
1084
1085         err = esd_usb2_wait_msg(dev, msg);
1086         if (err < 0) {
1087                 dev_err(&intf->dev, "no version message answer\n");
1088                 goto free_msg;
1089         }
1090
1091         dev->net_count = (int)msg->msg.version_reply.nets;
1092         dev->version = le32_to_cpu(msg->msg.version_reply.version);
1093
1094         if (device_create_file(&intf->dev, &dev_attr_firmware))
1095                 dev_err(&intf->dev,
1096                         "Couldn't create device file for firmware\n");
1097
1098         if (device_create_file(&intf->dev, &dev_attr_hardware))
1099                 dev_err(&intf->dev,
1100                         "Couldn't create device file for hardware\n");
1101
1102         if (device_create_file(&intf->dev, &dev_attr_nets))
1103                 dev_err(&intf->dev,
1104                         "Couldn't create device file for nets\n");
1105
1106         /* do per device probing */
1107         for (i = 0; i < dev->net_count; i++)
1108                 esd_usb2_probe_one_net(intf, i);
1109
1110 free_msg:
1111         kfree(msg);
1112         if (err)
1113                 kfree(dev);
1114 done:
1115         return err;
1116 }
1117
1118 /*
1119  * called by the usb core when the device is removed from the system
1120  */
1121 static void esd_usb2_disconnect(struct usb_interface *intf)
1122 {
1123         struct esd_usb2 *dev = usb_get_intfdata(intf);
1124         struct net_device *netdev;
1125         int i;
1126
1127         device_remove_file(&intf->dev, &dev_attr_firmware);
1128         device_remove_file(&intf->dev, &dev_attr_hardware);
1129         device_remove_file(&intf->dev, &dev_attr_nets);
1130
1131         usb_set_intfdata(intf, NULL);
1132
1133         if (dev) {
1134                 for (i = 0; i < dev->net_count; i++) {
1135                         if (dev->nets[i]) {
1136                                 netdev = dev->nets[i]->netdev;
1137                                 unregister_netdev(netdev);
1138                                 free_candev(netdev);
1139                         }
1140                 }
1141                 unlink_all_urbs(dev);
1142                 kfree(dev);
1143         }
1144 }
1145
1146 /* usb specific object needed to register this driver with the usb subsystem */
1147 static struct usb_driver esd_usb2_driver = {
1148         .name = "esd_usb2",
1149         .probe = esd_usb2_probe,
1150         .disconnect = esd_usb2_disconnect,
1151         .id_table = esd_usb2_table,
1152 };
1153
1154 module_usb_driver(esd_usb2_driver);