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/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
  30 MODULE_AUTHOR("Matthias Fuchs <matthias.fuchs@esd.eu>");
  31 MODULE_DESCRIPTION("CAN driver for esd CAN-USB/2 and CAN-USB/Micro interfaces");
  32 MODULE_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
 103 struct header_msg {
 104         u8 len; /* len is always the total message length in 32bit words */
 105         u8 cmd;
 106         u8 rsvd[2];
 107 };
 108
 109 struct version_msg {
 110         u8 len;
 111         u8 cmd;
 112         u8 rsvd;
 113         u8 flags;
 114         __le32 drv_version;
 115 };
 116
 117 struct 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
 128 struct 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
 138 struct 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
 148 struct tx_done_msg {
 149         u8 len;
 150         u8 cmd;
 151         u8 net;
 152         u8 status;
 153         __le32 hnd;
 154         __le32 ts;
 155 };
 156
 157 struct 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
 165 struct 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 */
 174 struct __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
 187 static 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 };
 192 MODULE_DEVICE_TABLE(usb, esd_usb2_table);
 193
 194 struct esd_usb2_net_priv;
 195
 196 struct esd_tx_urb_context {
 197         struct esd_usb2_net_priv *priv;
 198         u32 echo_index;
 199         int dlc;
 200 };
 201
 202 struct 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
 213 struct 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
 227 static 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
 314 static 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
 359 static 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
 387 static 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
 442 resubmit_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  */
 464 static 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
 491 static 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 }
 502 static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL);
 503
 504 static 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 }
 515 static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL);
 516
 517 static 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 }
 525 static DEVICE_ATTR(nets, S_IRUGO, show_nets, NULL);
 526
 527 static 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
 539 static 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
 552 static 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
 595 freeurb:
 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  */
 621 static 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
 666 out:
 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
 676 static 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
 694 static 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
 717 static 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
 838 releasebuf:
 839         usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
 840
 841 nobufmem:
 842         usb_free_urb(urb);
 843
 844 nourbmem:
 845         return ret;
 846 }
 847
 848 static 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
 888 static 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
 894 static 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
 906 static 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
 955 static 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
 966 static 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
 980 static 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
1040 done:
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  */
1050 static 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
1113 free_msg:
1114         kfree(msg);
1115         if (err)
1116                 kfree(dev);
1117 done:
1118         return err;
1119 }
1120
1121 /*
1122  * called by the usb core when the device is removed from the system
1123  */
1124 static 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 */
1149 static 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
1156 module_usb_driver(esd_usb2_driver);