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 & ~ESD_RTR);
 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 -EPIPE:
 397         case -EPROTO:
 398         case -ESHUTDOWN:
 399                 return;
 400
 401         default:
 402                 dev_info(dev->udev->dev.parent,
 403                          "Rx URB aborted (%d)\n", urb->status);
 404                 goto resubmit_urb;
 405         }
 406
 407         while (pos < urb->actual_length) {
 408                 struct esd_usb2_msg *msg;
 409
 410                 msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos);
 411
 412                 switch (msg->msg.hdr.cmd) {
 413                 case CMD_CAN_RX:
 414                         if (msg->msg.rx.net >= dev->net_count) {
 415                                 dev_err(dev->udev->dev.parent, "format error\n");
 416                                 break;
 417                         }
 418
 419                         esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg);
 420                         break;
 421
 422                 case CMD_CAN_TX:
 423                         if (msg->msg.txdone.net >= dev->net_count) {
 424                                 dev_err(dev->udev->dev.parent, "format error\n");
 425                                 break;
 426                         }
 427
 428                         esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net],
 429                                              msg);
 430                         break;
 431                 }
 432
 433                 pos += msg->msg.hdr.len << 2;
 434
 435                 if (pos > urb->actual_length) {
 436                         dev_err(dev->udev->dev.parent, "format error\n");
 437                         break;
 438                 }
 439         }
 440
 441 resubmit_urb:
 442         usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
 443                           urb->transfer_buffer, RX_BUFFER_SIZE,
 444                           esd_usb2_read_bulk_callback, dev);
 445
 446         retval = usb_submit_urb(urb, GFP_ATOMIC);
 447         if (retval == -ENODEV) {
 448                 for (i = 0; i < dev->net_count; i++) {
 449                         if (dev->nets[i])
 450                                 netif_device_detach(dev->nets[i]->netdev);
 451                 }
 452         } else if (retval) {
 453                 dev_err(dev->udev->dev.parent,
 454                         "failed resubmitting read bulk urb: %d\n", retval);
 455         }
 456
 457         return;
 458 }
 459
 460 /*
 461  * callback for bulk IN urb
 462  */
 463 static void esd_usb2_write_bulk_callback(struct urb *urb)
 464 {
 465         struct esd_tx_urb_context *context = urb->context;
 466         struct esd_usb2_net_priv *priv;
 467         struct net_device *netdev;
 468         size_t size = sizeof(struct esd_usb2_msg);
 469
 470         WARN_ON(!context);
 471
 472         priv = context->priv;
 473         netdev = priv->netdev;
 474
 475         /* free up our allocated buffer */
 476         usb_free_coherent(urb->dev, size,
 477                           urb->transfer_buffer, urb->transfer_dma);
 478
 479         if (!netif_device_present(netdev))
 480                 return;
 481
 482         if (urb->status)
 483                 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
 484
 485         netif_trans_update(netdev);
 486 }
 487
 488 static ssize_t show_firmware(struct device *d,
 489                              struct device_attribute *attr, char *buf)
 490 {
 491         struct usb_interface *intf = to_usb_interface(d);
 492         struct esd_usb2 *dev = usb_get_intfdata(intf);
 493
 494         return sprintf(buf, "%d.%d.%d\n",
 495                        (dev->version >> 12) & 0xf,
 496                        (dev->version >> 8) & 0xf,
 497                        dev->version & 0xff);
 498 }
 499 static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL);
 500
 501 static ssize_t show_hardware(struct device *d,
 502                              struct device_attribute *attr, char *buf)
 503 {
 504         struct usb_interface *intf = to_usb_interface(d);
 505         struct esd_usb2 *dev = usb_get_intfdata(intf);
 506
 507         return sprintf(buf, "%d.%d.%d\n",
 508                        (dev->version >> 28) & 0xf,
 509                        (dev->version >> 24) & 0xf,
 510                        (dev->version >> 16) & 0xff);
 511 }
 512 static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL);
 513
 514 static ssize_t show_nets(struct device *d,
 515                          struct device_attribute *attr, char *buf)
 516 {
 517         struct usb_interface *intf = to_usb_interface(d);
 518         struct esd_usb2 *dev = usb_get_intfdata(intf);
 519
 520         return sprintf(buf, "%d", dev->net_count);
 521 }
 522 static DEVICE_ATTR(nets, S_IRUGO, show_nets, NULL);
 523
 524 static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg)
 525 {
 526         int actual_length;
 527
 528         return usb_bulk_msg(dev->udev,
 529                             usb_sndbulkpipe(dev->udev, 2),
 530                             msg,
 531                             msg->msg.hdr.len << 2,
 532                             &actual_length,
 533                             1000);
 534 }
 535
 536 static int esd_usb2_wait_msg(struct esd_usb2 *dev,
 537                              struct esd_usb2_msg *msg)
 538 {
 539         int actual_length;
 540
 541         return usb_bulk_msg(dev->udev,
 542                             usb_rcvbulkpipe(dev->udev, 1),
 543                             msg,
 544                             sizeof(*msg),
 545                             &actual_length,
 546                             1000);
 547 }
 548
 549 static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev)
 550 {
 551         int i, err = 0;
 552
 553         if (dev->rxinitdone)
 554                 return 0;
 555
 556         for (i = 0; i < MAX_RX_URBS; i++) {
 557                 struct urb *urb = NULL;
 558                 u8 *buf = NULL;
 559
 560                 /* create a URB, and a buffer for it */
 561                 urb = usb_alloc_urb(0, GFP_KERNEL);
 562                 if (!urb) {
 563                         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                 stats->tx_dropped++;
 734                 dev_kfree_skb(skb);
 735                 goto nourbmem;
 736         }
 737
 738         buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC,
 739                                  &urb->transfer_dma);
 740         if (!buf) {
 741                 netdev_err(netdev, "No memory left for USB buffer\n");
 742                 stats->tx_dropped++;
 743                 dev_kfree_skb(skb);
 744                 goto nobufmem;
 745         }
 746
 747         msg = (struct esd_usb2_msg *)buf;
 748
 749         msg->msg.hdr.len = 3; /* minimal length */
 750         msg->msg.hdr.cmd = CMD_CAN_TX;
 751         msg->msg.tx.net = priv->index;
 752         msg->msg.tx.dlc = cf->can_dlc;
 753         msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK);
 754
 755         if (cf->can_id & CAN_RTR_FLAG)
 756                 msg->msg.tx.dlc |= ESD_RTR;
 757
 758         if (cf->can_id & CAN_EFF_FLAG)
 759                 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID);
 760
 761         for (i = 0; i < cf->can_dlc; i++)
 762                 msg->msg.tx.data[i] = cf->data[i];
 763
 764         msg->msg.hdr.len += (cf->can_dlc + 3) >> 2;
 765
 766         for (i = 0; i < MAX_TX_URBS; i++) {
 767                 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
 768                         context = &priv->tx_contexts[i];
 769                         break;
 770                 }
 771         }
 772
 773         /*
 774          * This may never happen.
 775          */
 776         if (!context) {
 777                 netdev_warn(netdev, "couldn't find free context\n");
 778                 ret = NETDEV_TX_BUSY;
 779                 goto releasebuf;
 780         }
 781
 782         context->priv = priv;
 783         context->echo_index = i;
 784         context->dlc = cf->can_dlc;
 785
 786         /* hnd must not be 0 - MSB is stripped in txdone handling */
 787         msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */
 788
 789         usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
 790                           msg->msg.hdr.len << 2,
 791                           esd_usb2_write_bulk_callback, context);
 792
 793         urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 794
 795         usb_anchor_urb(urb, &priv->tx_submitted);
 796
 797         can_put_echo_skb(skb, netdev, context->echo_index);
 798
 799         atomic_inc(&priv->active_tx_jobs);
 800
 801         /* Slow down tx path */
 802         if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS)
 803                 netif_stop_queue(netdev);
 804
 805         err = usb_submit_urb(urb, GFP_ATOMIC);
 806         if (err) {
 807                 can_free_echo_skb(netdev, context->echo_index);
 808
 809                 atomic_dec(&priv->active_tx_jobs);
 810                 usb_unanchor_urb(urb);
 811
 812                 stats->tx_dropped++;
 813
 814                 if (err == -ENODEV)
 815                         netif_device_detach(netdev);
 816                 else
 817                         netdev_warn(netdev, "failed tx_urb %d\n", err);
 818
 819                 goto releasebuf;
 820         }
 821
 822         netif_trans_update(netdev);
 823
 824         /*
 825          * Release our reference to this URB, the USB core will eventually free
 826          * it entirely.
 827          */
 828         usb_free_urb(urb);
 829
 830         return NETDEV_TX_OK;
 831
 832 releasebuf:
 833         usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
 834
 835 nobufmem:
 836         usb_free_urb(urb);
 837
 838 nourbmem:
 839         return ret;
 840 }
 841
 842 static int esd_usb2_close(struct net_device *netdev)
 843 {
 844         struct esd_usb2_net_priv *priv = netdev_priv(netdev);
 845         struct esd_usb2_msg *msg;
 846         int i;
 847
 848         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
 849         if (!msg)
 850                 return -ENOMEM;
 851
 852         /* Disable all IDs (see esd_usb2_start()) */
 853         msg->msg.hdr.cmd = CMD_IDADD;
 854         msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
 855         msg->msg.filter.net = priv->index;
 856         msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
 857         for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++)
 858                 msg->msg.filter.mask[i] = 0;
 859         if (esd_usb2_send_msg(priv->usb2, msg) < 0)
 860                 netdev_err(netdev, "sending idadd message failed\n");
 861
 862         /* set CAN controller to reset mode */
 863         msg->msg.hdr.len = 2;
 864         msg->msg.hdr.cmd = CMD_SETBAUD;
 865         msg->msg.setbaud.net = priv->index;
 866         msg->msg.setbaud.rsvd = 0;
 867         msg->msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE);
 868         if (esd_usb2_send_msg(priv->usb2, msg) < 0)
 869                 netdev_err(netdev, "sending setbaud message failed\n");
 870
 871         priv->can.state = CAN_STATE_STOPPED;
 872
 873         netif_stop_queue(netdev);
 874
 875         close_candev(netdev);
 876
 877         kfree(msg);
 878
 879         return 0;
 880 }
 881
 882 static const struct net_device_ops esd_usb2_netdev_ops = {
 883         .ndo_open = esd_usb2_open,
 884         .ndo_stop = esd_usb2_close,
 885         .ndo_start_xmit = esd_usb2_start_xmit,
 886         .ndo_change_mtu = can_change_mtu,
 887 };
 888
 889 static const struct can_bittiming_const esd_usb2_bittiming_const = {
 890         .name = "esd_usb2",
 891         .tseg1_min = ESD_USB2_TSEG1_MIN,
 892         .tseg1_max = ESD_USB2_TSEG1_MAX,
 893         .tseg2_min = ESD_USB2_TSEG2_MIN,
 894         .tseg2_max = ESD_USB2_TSEG2_MAX,
 895         .sjw_max = ESD_USB2_SJW_MAX,
 896         .brp_min = ESD_USB2_BRP_MIN,
 897         .brp_max = ESD_USB2_BRP_MAX,
 898         .brp_inc = ESD_USB2_BRP_INC,
 899 };
 900
 901 static int esd_usb2_set_bittiming(struct net_device *netdev)
 902 {
 903         struct esd_usb2_net_priv *priv = netdev_priv(netdev);
 904         struct can_bittiming *bt = &priv->can.bittiming;
 905         struct esd_usb2_msg *msg;
 906         int err;
 907         u32 canbtr;
 908         int sjw_shift;
 909
 910         canbtr = ESD_USB2_UBR;
 911         if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
 912                 canbtr |= ESD_USB2_LOM;
 913
 914         canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1);
 915
 916         if (le16_to_cpu(priv->usb2->udev->descriptor.idProduct) ==
 917             USB_CANUSBM_PRODUCT_ID)
 918                 sjw_shift = ESD_USBM_SJW_SHIFT;
 919         else
 920                 sjw_shift = ESD_USB2_SJW_SHIFT;
 921
 922         canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1))
 923                 << sjw_shift;
 924         canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1)
 925                    & (ESD_USB2_TSEG1_MAX - 1))
 926                 << ESD_USB2_TSEG1_SHIFT;
 927         canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1))
 928                 << ESD_USB2_TSEG2_SHIFT;
 929         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
 930                 canbtr |= ESD_USB2_3_SAMPLES;
 931
 932         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
 933         if (!msg)
 934                 return -ENOMEM;
 935
 936         msg->msg.hdr.len = 2;
 937         msg->msg.hdr.cmd = CMD_SETBAUD;
 938         msg->msg.setbaud.net = priv->index;
 939         msg->msg.setbaud.rsvd = 0;
 940         msg->msg.setbaud.baud = cpu_to_le32(canbtr);
 941
 942         netdev_info(netdev, "setting BTR=%#x\n", canbtr);
 943
 944         err = esd_usb2_send_msg(priv->usb2, msg);
 945
 946         kfree(msg);
 947         return err;
 948 }
 949
 950 static int esd_usb2_get_berr_counter(const struct net_device *netdev,
 951                                      struct can_berr_counter *bec)
 952 {
 953         struct esd_usb2_net_priv *priv = netdev_priv(netdev);
 954
 955         bec->txerr = priv->bec.txerr;
 956         bec->rxerr = priv->bec.rxerr;
 957
 958         return 0;
 959 }
 960
 961 static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode)
 962 {
 963         switch (mode) {
 964         case CAN_MODE_START:
 965                 netif_wake_queue(netdev);
 966                 break;
 967
 968         default:
 969                 return -EOPNOTSUPP;
 970         }
 971
 972         return 0;
 973 }
 974
 975 static int esd_usb2_probe_one_net(struct usb_interface *intf, int index)
 976 {
 977         struct esd_usb2 *dev = usb_get_intfdata(intf);
 978         struct net_device *netdev;
 979         struct esd_usb2_net_priv *priv;
 980         int err = 0;
 981         int i;
 982
 983         netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
 984         if (!netdev) {
 985                 dev_err(&intf->dev, "couldn't alloc candev\n");
 986                 err = -ENOMEM;
 987                 goto done;
 988         }
 989
 990         priv = netdev_priv(netdev);
 991
 992         init_usb_anchor(&priv->tx_submitted);
 993         atomic_set(&priv->active_tx_jobs, 0);
 994
 995         for (i = 0; i < MAX_TX_URBS; i++)
 996                 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
 997
 998         priv->usb2 = dev;
 999         priv->netdev = netdev;
1000         priv->index = index;
1001
1002         priv->can.state = CAN_STATE_STOPPED;
1003         priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY;
1004
1005         if (le16_to_cpu(dev->udev->descriptor.idProduct) ==
1006             USB_CANUSBM_PRODUCT_ID)
1007                 priv->can.clock.freq = ESD_USBM_CAN_CLOCK;
1008         else {
1009                 priv->can.clock.freq = ESD_USB2_CAN_CLOCK;
1010                 priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
1011         }
1012
1013         priv->can.bittiming_const = &esd_usb2_bittiming_const;
1014         priv->can.do_set_bittiming = esd_usb2_set_bittiming;
1015         priv->can.do_set_mode = esd_usb2_set_mode;
1016         priv->can.do_get_berr_counter = esd_usb2_get_berr_counter;
1017
1018         netdev->flags |= IFF_ECHO; /* we support local echo */
1019
1020         netdev->netdev_ops = &esd_usb2_netdev_ops;
1021
1022         SET_NETDEV_DEV(netdev, &intf->dev);
1023         netdev->dev_id = index;
1024
1025         err = register_candev(netdev);
1026         if (err) {
1027                 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err);
1028                 free_candev(netdev);
1029                 err = -ENOMEM;
1030                 goto done;
1031         }
1032
1033         dev->nets[index] = priv;
1034         netdev_info(netdev, "device %s registered\n", netdev->name);
1035
1036 done:
1037         return err;
1038 }
1039
1040 /*
1041  * probe function for new USB2 devices
1042  *
1043  * check version information and number of available
1044  * CAN interfaces
1045  */
1046 static int esd_usb2_probe(struct usb_interface *intf,
1047                          const struct usb_device_id *id)
1048 {
1049         struct esd_usb2 *dev;
1050         struct esd_usb2_msg *msg;
1051         int i, err;
1052
1053         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1054         if (!dev) {
1055                 err = -ENOMEM;
1056                 goto done;
1057         }
1058
1059         dev->udev = interface_to_usbdev(intf);
1060
1061         init_usb_anchor(&dev->rx_submitted);
1062
1063         usb_set_intfdata(intf, dev);
1064
1065         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1066         if (!msg) {
1067                 err = -ENOMEM;
1068                 goto free_msg;
1069         }
1070
1071         /* query number of CAN interfaces (nets) */
1072         msg->msg.hdr.cmd = CMD_VERSION;
1073         msg->msg.hdr.len = 2;
1074         msg->msg.version.rsvd = 0;
1075         msg->msg.version.flags = 0;
1076         msg->msg.version.drv_version = 0;
1077
1078         err = esd_usb2_send_msg(dev, msg);
1079         if (err < 0) {
1080                 dev_err(&intf->dev, "sending version message failed\n");
1081                 goto free_msg;
1082         }
1083
1084         err = esd_usb2_wait_msg(dev, msg);
1085         if (err < 0) {
1086                 dev_err(&intf->dev, "no version message answer\n");
1087                 goto free_msg;
1088         }
1089
1090         dev->net_count = (int)msg->msg.version_reply.nets;
1091         dev->version = le32_to_cpu(msg->msg.version_reply.version);
1092
1093         if (device_create_file(&intf->dev, &dev_attr_firmware))
1094                 dev_err(&intf->dev,
1095                         "Couldn't create device file for firmware\n");
1096
1097         if (device_create_file(&intf->dev, &dev_attr_hardware))
1098                 dev_err(&intf->dev,
1099                         "Couldn't create device file for hardware\n");
1100
1101         if (device_create_file(&intf->dev, &dev_attr_nets))
1102                 dev_err(&intf->dev,
1103                         "Couldn't create device file for nets\n");
1104
1105         /* do per device probing */
1106         for (i = 0; i < dev->net_count; i++)
1107                 esd_usb2_probe_one_net(intf, i);
1108
1109 free_msg:
1110         kfree(msg);
1111         if (err)
1112                 kfree(dev);
1113 done:
1114         return err;
1115 }
1116
1117 /*
1118  * called by the usb core when the device is removed from the system
1119  */
1120 static void esd_usb2_disconnect(struct usb_interface *intf)
1121 {
1122         struct esd_usb2 *dev = usb_get_intfdata(intf);
1123         struct net_device *netdev;
1124         int i;
1125
1126         device_remove_file(&intf->dev, &dev_attr_firmware);
1127         device_remove_file(&intf->dev, &dev_attr_hardware);
1128         device_remove_file(&intf->dev, &dev_attr_nets);
1129
1130         usb_set_intfdata(intf, NULL);
1131
1132         if (dev) {
1133                 for (i = 0; i < dev->net_count; i++) {
1134                         if (dev->nets[i]) {
1135                                 netdev = dev->nets[i]->netdev;
1136                                 unregister_netdev(netdev);
1137                                 free_candev(netdev);
1138                         }
1139                 }
1140                 unlink_all_urbs(dev);
1141                 kfree(dev);
1142         }
1143 }
1144
1145 /* usb specific object needed to register this driver with the usb subsystem */
1146 static struct usb_driver esd_usb2_driver = {
1147         .name = "esd_usb2",
1148         .probe = esd_usb2_probe,
1149         .disconnect = esd_usb2_disconnect,
1150         .id_table = esd_usb2_table,
1151 };
1152
1153 module_usb_driver(esd_usb2_driver);