drivers/net/can/usb/kvaser_usb.c

   1 /*
   2  * This program is free software; you can redistribute it and/or
   3  * modify it under the terms of the GNU General Public License as
   4  * published by the Free Software Foundation version 2.
   5  *
   6  * Parts of this driver are based on the following:
   7  *  - Kvaser linux leaf driver (version 4.78)
   8  *  - CAN driver for esd CAN-USB/2
   9  *
  10  * Copyright (C) 2002-2006 KVASER AB, Sweden. All rights reserved.
  11  * Copyright (C) 2010 Matthias Fuchs <[email protected]>, esd gmbh
  12  * Copyright (C) 2012 Olivier Sobrie <[email protected]>
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/completion.h>
  17 #include <linux/module.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/usb.h>
  20
  21 #include <linux/can.h>
  22 #include <linux/can/dev.h>
  23 #include <linux/can/error.h>
  24
  25 #define MAX_TX_URBS                     16
  26 #define MAX_RX_URBS                     4
  27 #define START_TIMEOUT                   1000 /* msecs */
  28 #define STOP_TIMEOUT                    1000 /* msecs */
  29 #define USB_SEND_TIMEOUT                1000 /* msecs */
  30 #define USB_RECV_TIMEOUT                1000 /* msecs */
  31 #define RX_BUFFER_SIZE                  3072
  32 #define CAN_USB_CLOCK                   8000000
  33 #define MAX_NET_DEVICES                 3
  34
  35 /* Kvaser USB devices */
  36 #define KVASER_VENDOR_ID                0x0bfd
  37 #define USB_LEAF_DEVEL_PRODUCT_ID       10
  38 #define USB_LEAF_LITE_PRODUCT_ID        11
  39 #define USB_LEAF_PRO_PRODUCT_ID         12
  40 #define USB_LEAF_SPRO_PRODUCT_ID        14
  41 #define USB_LEAF_PRO_LS_PRODUCT_ID      15
  42 #define USB_LEAF_PRO_SWC_PRODUCT_ID     16
  43 #define USB_LEAF_PRO_LIN_PRODUCT_ID     17
  44 #define USB_LEAF_SPRO_LS_PRODUCT_ID     18
  45 #define USB_LEAF_SPRO_SWC_PRODUCT_ID    19
  46 #define USB_MEMO2_DEVEL_PRODUCT_ID      22
  47 #define USB_MEMO2_HSHS_PRODUCT_ID       23
  48 #define USB_UPRO_HSHS_PRODUCT_ID        24
  49 #define USB_LEAF_LITE_GI_PRODUCT_ID     25
  50 #define USB_LEAF_PRO_OBDII_PRODUCT_ID   26
  51 #define USB_MEMO2_HSLS_PRODUCT_ID       27
  52 #define USB_LEAF_LITE_CH_PRODUCT_ID     28
  53 #define USB_BLACKBIRD_SPRO_PRODUCT_ID   29
  54 #define USB_OEM_MERCURY_PRODUCT_ID      34
  55 #define USB_OEM_LEAF_PRODUCT_ID         35
  56 #define USB_CAN_R_PRODUCT_ID            39
  57
  58 /* USB devices features */
  59 #define KVASER_HAS_SILENT_MODE          BIT(0)
  60 #define KVASER_HAS_TXRX_ERRORS          BIT(1)
  61
  62 /* Message header size */
  63 #define MSG_HEADER_LEN                  2
  64
  65 /* Can message flags */
  66 #define MSG_FLAG_ERROR_FRAME            BIT(0)
  67 #define MSG_FLAG_OVERRUN                BIT(1)
  68 #define MSG_FLAG_NERR                   BIT(2)
  69 #define MSG_FLAG_WAKEUP                 BIT(3)
  70 #define MSG_FLAG_REMOTE_FRAME           BIT(4)
  71 #define MSG_FLAG_RESERVED               BIT(5)
  72 #define MSG_FLAG_TX_ACK                 BIT(6)
  73 #define MSG_FLAG_TX_REQUEST             BIT(7)
  74
  75 /* Can states */
  76 #define M16C_STATE_BUS_RESET            BIT(0)
  77 #define M16C_STATE_BUS_ERROR            BIT(4)
  78 #define M16C_STATE_BUS_PASSIVE          BIT(5)
  79 #define M16C_STATE_BUS_OFF              BIT(6)
  80
  81 /* Can msg ids */
  82 #define CMD_RX_STD_MESSAGE              12
  83 #define CMD_TX_STD_MESSAGE              13
  84 #define CMD_RX_EXT_MESSAGE              14
  85 #define CMD_TX_EXT_MESSAGE              15
  86 #define CMD_SET_BUS_PARAMS              16
  87 #define CMD_GET_BUS_PARAMS              17
  88 #define CMD_GET_BUS_PARAMS_REPLY        18
  89 #define CMD_GET_CHIP_STATE              19
  90 #define CMD_CHIP_STATE_EVENT            20
  91 #define CMD_SET_CTRL_MODE               21
  92 #define CMD_GET_CTRL_MODE               22
  93 #define CMD_GET_CTRL_MODE_REPLY         23
  94 #define CMD_RESET_CHIP                  24
  95 #define CMD_RESET_CARD                  25
  96 #define CMD_START_CHIP                  26
  97 #define CMD_START_CHIP_REPLY            27
  98 #define CMD_STOP_CHIP                   28
  99 #define CMD_STOP_CHIP_REPLY             29
 100 #define CMD_GET_CARD_INFO2              32
 101 #define CMD_GET_CARD_INFO               34
 102 #define CMD_GET_CARD_INFO_REPLY         35
 103 #define CMD_GET_SOFTWARE_INFO           38
 104 #define CMD_GET_SOFTWARE_INFO_REPLY     39
 105 #define CMD_ERROR_EVENT                 45
 106 #define CMD_FLUSH_QUEUE                 48
 107 #define CMD_RESET_ERROR_COUNTER         49
 108 #define CMD_TX_ACKNOWLEDGE              50
 109 #define CMD_CAN_ERROR_EVENT             51
 110 #define CMD_USB_THROTTLE                77
 111 #define CMD_LOG_MESSAGE                 106
 112
 113 /* error factors */
 114 #define M16C_EF_ACKE                    BIT(0)
 115 #define M16C_EF_CRCE                    BIT(1)
 116 #define M16C_EF_FORME                   BIT(2)
 117 #define M16C_EF_STFE                    BIT(3)
 118 #define M16C_EF_BITE0                   BIT(4)
 119 #define M16C_EF_BITE1                   BIT(5)
 120 #define M16C_EF_RCVE                    BIT(6)
 121 #define M16C_EF_TRE                     BIT(7)
 122
 123 /* bittiming parameters */
 124 #define KVASER_USB_TSEG1_MIN            1
 125 #define KVASER_USB_TSEG1_MAX            16
 126 #define KVASER_USB_TSEG2_MIN            1
 127 #define KVASER_USB_TSEG2_MAX            8
 128 #define KVASER_USB_SJW_MAX              4
 129 #define KVASER_USB_BRP_MIN              1
 130 #define KVASER_USB_BRP_MAX              64
 131 #define KVASER_USB_BRP_INC              1
 132
 133 /* ctrl modes */
 134 #define KVASER_CTRL_MODE_NORMAL         1
 135 #define KVASER_CTRL_MODE_SILENT         2
 136 #define KVASER_CTRL_MODE_SELFRECEPTION  3
 137 #define KVASER_CTRL_MODE_OFF            4
 138
 139 /* log message */
 140 #define KVASER_EXTENDED_FRAME           BIT(31)
 141
 142 struct kvaser_msg_simple {
 143         u8 tid;
 144         u8 channel;
 145 } __packed;
 146
 147 struct kvaser_msg_cardinfo {
 148         u8 tid;
 149         u8 nchannels;
 150         __le32 serial_number;
 151         __le32 padding;
 152         __le32 clock_resolution;
 153         __le32 mfgdate;
 154         u8 ean[8];
 155         u8 hw_revision;
 156         u8 usb_hs_mode;
 157         __le16 padding2;
 158 } __packed;
 159
 160 struct kvaser_msg_cardinfo2 {
 161         u8 tid;
 162         u8 channel;
 163         u8 pcb_id[24];
 164         __le32 oem_unlock_code;
 165 } __packed;
 166
 167 struct kvaser_msg_softinfo {
 168         u8 tid;
 169         u8 channel;
 170         __le32 sw_options;
 171         __le32 fw_version;
 172         __le16 max_outstanding_tx;
 173         __le16 padding[9];
 174 } __packed;
 175
 176 struct kvaser_msg_busparams {
 177         u8 tid;
 178         u8 channel;
 179         __le32 bitrate;
 180         u8 tseg1;
 181         u8 tseg2;
 182         u8 sjw;
 183         u8 no_samp;
 184 } __packed;
 185
 186 struct kvaser_msg_tx_can {
 187         u8 channel;
 188         u8 tid;
 189         u8 msg[14];
 190         u8 padding;
 191         u8 flags;
 192 } __packed;
 193
 194 struct kvaser_msg_rx_can {
 195         u8 channel;
 196         u8 flag;
 197         __le16 time[3];
 198         u8 msg[14];
 199 } __packed;
 200
 201 struct kvaser_msg_chip_state_event {
 202         u8 tid;
 203         u8 channel;
 204         __le16 time[3];
 205         u8 tx_errors_count;
 206         u8 rx_errors_count;
 207         u8 status;
 208         u8 padding[3];
 209 } __packed;
 210
 211 struct kvaser_msg_tx_acknowledge {
 212         u8 channel;
 213         u8 tid;
 214         __le16 time[3];
 215         u8 flags;
 216         u8 time_offset;
 217 } __packed;
 218
 219 struct kvaser_msg_error_event {
 220         u8 tid;
 221         u8 flags;
 222         __le16 time[3];
 223         u8 channel;
 224         u8 padding;
 225         u8 tx_errors_count;
 226         u8 rx_errors_count;
 227         u8 status;
 228         u8 error_factor;
 229 } __packed;
 230
 231 struct kvaser_msg_ctrl_mode {
 232         u8 tid;
 233         u8 channel;
 234         u8 ctrl_mode;
 235         u8 padding[3];
 236 } __packed;
 237
 238 struct kvaser_msg_flush_queue {
 239         u8 tid;
 240         u8 channel;
 241         u8 flags;
 242         u8 padding[3];
 243 } __packed;
 244
 245 struct kvaser_msg_log_message {
 246         u8 channel;
 247         u8 flags;
 248         __le16 time[3];
 249         u8 dlc;
 250         u8 time_offset;
 251         __le32 id;
 252         u8 data[8];
 253 } __packed;
 254
 255 struct kvaser_msg {
 256         u8 len;
 257         u8 id;
 258         union   {
 259                 struct kvaser_msg_simple simple;
 260                 struct kvaser_msg_cardinfo cardinfo;
 261                 struct kvaser_msg_cardinfo2 cardinfo2;
 262                 struct kvaser_msg_softinfo softinfo;
 263                 struct kvaser_msg_busparams busparams;
 264                 struct kvaser_msg_tx_can tx_can;
 265                 struct kvaser_msg_rx_can rx_can;
 266                 struct kvaser_msg_chip_state_event chip_state_event;
 267                 struct kvaser_msg_tx_acknowledge tx_acknowledge;
 268                 struct kvaser_msg_error_event error_event;
 269                 struct kvaser_msg_ctrl_mode ctrl_mode;
 270                 struct kvaser_msg_flush_queue flush_queue;
 271                 struct kvaser_msg_log_message log_message;
 272         } u;
 273 } __packed;
 274
 275 struct kvaser_usb_tx_urb_context {
 276         struct kvaser_usb_net_priv *priv;
 277         u32 echo_index;
 278         int dlc;
 279 };
 280
 281 struct kvaser_usb {
 282         struct usb_device *udev;
 283         struct kvaser_usb_net_priv *nets[MAX_NET_DEVICES];
 284
 285         struct usb_endpoint_descriptor *bulk_in, *bulk_out;
 286         struct usb_anchor rx_submitted;
 287
 288         u32 fw_version;
 289         unsigned int nchannels;
 290
 291         bool rxinitdone;
 292         void *rxbuf[MAX_RX_URBS];
 293         dma_addr_t rxbuf_dma[MAX_RX_URBS];
 294 };
 295
 296 struct kvaser_usb_net_priv {
 297         struct can_priv can;
 298
 299         atomic_t active_tx_urbs;
 300         struct usb_anchor tx_submitted;
 301         struct kvaser_usb_tx_urb_context tx_contexts[MAX_TX_URBS];
 302
 303         struct completion start_comp, stop_comp;
 304
 305         struct kvaser_usb *dev;
 306         struct net_device *netdev;
 307         int channel;
 308
 309         struct can_berr_counter bec;
 310 };
 311
 312 static const struct usb_device_id kvaser_usb_table[] = {
 313         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
 314         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
 315         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
 316                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 317                                KVASER_HAS_SILENT_MODE },
 318         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
 319                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 320                                KVASER_HAS_SILENT_MODE },
 321         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
 322                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 323                                KVASER_HAS_SILENT_MODE },
 324         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
 325                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 326                                KVASER_HAS_SILENT_MODE },
 327         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
 328                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 329                                KVASER_HAS_SILENT_MODE },
 330         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
 331                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 332                                KVASER_HAS_SILENT_MODE },
 333         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
 334                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 335                                KVASER_HAS_SILENT_MODE },
 336         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
 337                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 338                                KVASER_HAS_SILENT_MODE },
 339         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
 340                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 341                                KVASER_HAS_SILENT_MODE },
 342         { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
 343                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 344         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
 345         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
 346                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 347                                KVASER_HAS_SILENT_MODE },
 348         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
 349                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 350         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
 351                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 352         { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
 353                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 354         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
 355                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 356         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
 357                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 358         { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
 359                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 360         { }
 361 };
 362 MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
 363
 364 static inline int kvaser_usb_send_msg(const struct kvaser_usb *dev,
 365                                       struct kvaser_msg *msg)
 366 {
 367         int actual_len;
 368
 369         return usb_bulk_msg(dev->udev,
 370                             usb_sndbulkpipe(dev->udev,
 371                                         dev->bulk_out->bEndpointAddress),
 372                             msg, msg->len, &actual_len,
 373                             USB_SEND_TIMEOUT);
 374 }
 375
 376 static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id,
 377                                struct kvaser_msg *msg)
 378 {
 379         struct kvaser_msg *tmp;
 380         void *buf;
 381         int actual_len;
 382         int err;
 383         int pos = 0;
 384
 385         buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL);
 386         if (!buf)
 387                 return -ENOMEM;
 388
 389         err = usb_bulk_msg(dev->udev,
 390                            usb_rcvbulkpipe(dev->udev,
 391                                            dev->bulk_in->bEndpointAddress),
 392                            buf, RX_BUFFER_SIZE, &actual_len,
 393                            USB_RECV_TIMEOUT);
 394         if (err < 0)
 395                 goto end;
 396
 397         while (pos <= actual_len - MSG_HEADER_LEN) {
 398                 tmp = buf + pos;
 399
 400                 if (!tmp->len)
 401                         break;
 402
 403                 if (pos + tmp->len > actual_len) {
 404                         dev_err(dev->udev->dev.parent, "Format error\n");
 405                         break;
 406                 }
 407
 408                 if (tmp->id == id) {
 409                         memcpy(msg, tmp, tmp->len);
 410                         goto end;
 411                 }
 412
 413                 pos += tmp->len;
 414         }
 415
 416         err = -EINVAL;
 417
 418 end:
 419         kfree(buf);
 420
 421         return err;
 422 }
 423
 424 static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev,
 425                                       u8 msg_id, int channel)
 426 {
 427         struct kvaser_msg *msg;
 428         int rc;
 429
 430         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
 431         if (!msg)
 432                 return -ENOMEM;
 433
 434         msg->id = msg_id;
 435         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 436         msg->u.simple.channel = channel;
 437         msg->u.simple.tid = 0xff;
 438
 439         rc = kvaser_usb_send_msg(dev, msg);
 440
 441         kfree(msg);
 442         return rc;
 443 }
 444
 445 static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
 446 {
 447         struct kvaser_msg msg;
 448         int err;
 449
 450         err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0);
 451         if (err)
 452                 return err;
 453
 454         err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg);
 455         if (err)
 456                 return err;
 457
 458         dev->fw_version = le32_to_cpu(msg.u.softinfo.fw_version);
 459
 460         return 0;
 461 }
 462
 463 static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
 464 {
 465         struct kvaser_msg msg;
 466         int err;
 467
 468         err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0);
 469         if (err)
 470                 return err;
 471
 472         err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg);
 473         if (err)
 474                 return err;
 475
 476         dev->nchannels = msg.u.cardinfo.nchannels;
 477
 478         return 0;
 479 }
 480
 481 static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
 482                                       const struct kvaser_msg *msg)
 483 {
 484         struct net_device_stats *stats;
 485         struct kvaser_usb_tx_urb_context *context;
 486         struct kvaser_usb_net_priv *priv;
 487         struct sk_buff *skb;
 488         struct can_frame *cf;
 489         u8 channel = msg->u.tx_acknowledge.channel;
 490         u8 tid = msg->u.tx_acknowledge.tid;
 491
 492         if (channel >= dev->nchannels) {
 493                 dev_err(dev->udev->dev.parent,
 494                         "Invalid channel number (%d)\n", channel);
 495                 return;
 496         }
 497
 498         priv = dev->nets[channel];
 499
 500         if (!netif_device_present(priv->netdev))
 501                 return;
 502
 503         stats = &priv->netdev->stats;
 504
 505         context = &priv->tx_contexts[tid % MAX_TX_URBS];
 506
 507         /* Sometimes the state change doesn't come after a bus-off event */
 508         if (priv->can.restart_ms &&
 509             (priv->can.state >= CAN_STATE_BUS_OFF)) {
 510                 skb = alloc_can_err_skb(priv->netdev, &cf);
 511                 if (skb) {
 512                         cf->can_id |= CAN_ERR_RESTARTED;
 513                         netif_rx(skb);
 514
 515                         stats->rx_packets++;
 516                         stats->rx_bytes += cf->can_dlc;
 517                 } else {
 518                         netdev_err(priv->netdev,
 519                                    "No memory left for err_skb\n");
 520                 }
 521
 522                 priv->can.can_stats.restarts++;
 523                 netif_carrier_on(priv->netdev);
 524
 525                 priv->can.state = CAN_STATE_ERROR_ACTIVE;
 526         }
 527
 528         stats->tx_packets++;
 529         stats->tx_bytes += context->dlc;
 530         can_get_echo_skb(priv->netdev, context->echo_index);
 531
 532         context->echo_index = MAX_TX_URBS;
 533         atomic_dec(&priv->active_tx_urbs);
 534
 535         netif_wake_queue(priv->netdev);
 536 }
 537
 538 static void kvaser_usb_simple_msg_callback(struct urb *urb)
 539 {
 540         struct net_device *netdev = urb->context;
 541
 542         kfree(urb->transfer_buffer);
 543
 544         if (urb->status)
 545                 netdev_warn(netdev, "urb status received: %d\n",
 546                             urb->status);
 547 }
 548
 549 static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
 550                                        u8 msg_id)
 551 {
 552         struct kvaser_usb *dev = priv->dev;
 553         struct net_device *netdev = priv->netdev;
 554         struct kvaser_msg *msg;
 555         struct urb *urb;
 556         void *buf;
 557         int err;
 558
 559         urb = usb_alloc_urb(0, GFP_ATOMIC);
 560         if (!urb) {
 561                 netdev_err(netdev, "No memory left for URBs\n");
 562                 return -ENOMEM;
 563         }
 564
 565         buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
 566         if (!buf) {
 567                 usb_free_urb(urb);
 568                 return -ENOMEM;
 569         }
 570
 571         msg = (struct kvaser_msg *)buf;
 572         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 573         msg->id = msg_id;
 574         msg->u.simple.channel = priv->channel;
 575
 576         usb_fill_bulk_urb(urb, dev->udev,
 577                           usb_sndbulkpipe(dev->udev,
 578                                           dev->bulk_out->bEndpointAddress),
 579                           buf, msg->len,
 580                           kvaser_usb_simple_msg_callback, priv);
 581         usb_anchor_urb(urb, &priv->tx_submitted);
 582
 583         err = usb_submit_urb(urb, GFP_ATOMIC);
 584         if (err) {
 585                 netdev_err(netdev, "Error transmitting URB\n");
 586                 usb_unanchor_urb(urb);
 587                 usb_free_urb(urb);
 588                 kfree(buf);
 589                 return err;
 590         }
 591
 592         usb_free_urb(urb);
 593
 594         return 0;
 595 }
 596
 597 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
 598 {
 599         int i;
 600
 601         usb_kill_anchored_urbs(&priv->tx_submitted);
 602         atomic_set(&priv->active_tx_urbs, 0);
 603
 604         for (i = 0; i < MAX_TX_URBS; i++)
 605                 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
 606 }
 607
 608 static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
 609                                 const struct kvaser_msg *msg)
 610 {
 611         struct can_frame *cf;
 612         struct sk_buff *skb;
 613         struct net_device_stats *stats;
 614         struct kvaser_usb_net_priv *priv;
 615         unsigned int new_state;
 616         u8 channel, status, txerr, rxerr, error_factor;
 617
 618         switch (msg->id) {
 619         case CMD_CAN_ERROR_EVENT:
 620                 channel = msg->u.error_event.channel;
 621                 status =  msg->u.error_event.status;
 622                 txerr = msg->u.error_event.tx_errors_count;
 623                 rxerr = msg->u.error_event.rx_errors_count;
 624                 error_factor = msg->u.error_event.error_factor;
 625                 break;
 626         case CMD_LOG_MESSAGE:
 627                 channel = msg->u.log_message.channel;
 628                 status = msg->u.log_message.data[0];
 629                 txerr = msg->u.log_message.data[2];
 630                 rxerr = msg->u.log_message.data[3];
 631                 error_factor = msg->u.log_message.data[1];
 632                 break;
 633         case CMD_CHIP_STATE_EVENT:
 634                 channel = msg->u.chip_state_event.channel;
 635                 status =  msg->u.chip_state_event.status;
 636                 txerr = msg->u.chip_state_event.tx_errors_count;
 637                 rxerr = msg->u.chip_state_event.rx_errors_count;
 638                 error_factor = 0;
 639                 break;
 640         default:
 641                 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
 642                         msg->id);
 643                 return;
 644         }
 645
 646         if (channel >= dev->nchannels) {
 647                 dev_err(dev->udev->dev.parent,
 648                         "Invalid channel number (%d)\n", channel);
 649                 return;
 650         }
 651
 652         priv = dev->nets[channel];
 653         stats = &priv->netdev->stats;
 654
 655         if (status & M16C_STATE_BUS_RESET) {
 656                 kvaser_usb_unlink_tx_urbs(priv);
 657                 return;
 658         }
 659
 660         skb = alloc_can_err_skb(priv->netdev, &cf);
 661         if (!skb) {
 662                 stats->rx_dropped++;
 663                 return;
 664         }
 665
 666         new_state = priv->can.state;
 667
 668         netdev_dbg(priv->netdev, "Error status: 0x%02x\n", status);
 669
 670         if (status & M16C_STATE_BUS_OFF) {
 671                 cf->can_id |= CAN_ERR_BUSOFF;
 672
 673                 priv->can.can_stats.bus_off++;
 674                 if (!priv->can.restart_ms)
 675                         kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP);
 676
 677                 netif_carrier_off(priv->netdev);
 678
 679                 new_state = CAN_STATE_BUS_OFF;
 680         } else if (status & M16C_STATE_BUS_PASSIVE) {
 681                 if (priv->can.state != CAN_STATE_ERROR_PASSIVE) {
 682                         cf->can_id |= CAN_ERR_CRTL;
 683
 684                         if (txerr || rxerr)
 685                                 cf->data[1] = (txerr > rxerr)
 686                                                 ? CAN_ERR_CRTL_TX_PASSIVE
 687                                                 : CAN_ERR_CRTL_RX_PASSIVE;
 688                         else
 689                                 cf->data[1] = CAN_ERR_CRTL_TX_PASSIVE |
 690                                               CAN_ERR_CRTL_RX_PASSIVE;
 691
 692                         priv->can.can_stats.error_passive++;
 693                 }
 694
 695                 new_state = CAN_STATE_ERROR_PASSIVE;
 696         }
 697
 698         if (status == M16C_STATE_BUS_ERROR) {
 699                 if ((priv->can.state < CAN_STATE_ERROR_WARNING) &&
 700                     ((txerr >= 96) || (rxerr >= 96))) {
 701                         cf->can_id |= CAN_ERR_CRTL;
 702                         cf->data[1] = (txerr > rxerr)
 703                                         ? CAN_ERR_CRTL_TX_WARNING
 704                                         : CAN_ERR_CRTL_RX_WARNING;
 705
 706                         priv->can.can_stats.error_warning++;
 707                         new_state = CAN_STATE_ERROR_WARNING;
 708                 } else if (priv->can.state > CAN_STATE_ERROR_ACTIVE) {
 709                         cf->can_id |= CAN_ERR_PROT;
 710                         cf->data[2] = CAN_ERR_PROT_ACTIVE;
 711
 712                         new_state = CAN_STATE_ERROR_ACTIVE;
 713                 }
 714         }
 715
 716         if (!status) {
 717                 cf->can_id |= CAN_ERR_PROT;
 718                 cf->data[2] = CAN_ERR_PROT_ACTIVE;
 719
 720                 new_state = CAN_STATE_ERROR_ACTIVE;
 721         }
 722
 723         if (priv->can.restart_ms &&
 724             (priv->can.state >= CAN_STATE_BUS_OFF) &&
 725             (new_state < CAN_STATE_BUS_OFF)) {
 726                 cf->can_id |= CAN_ERR_RESTARTED;
 727                 netif_carrier_on(priv->netdev);
 728
 729                 priv->can.can_stats.restarts++;
 730         }
 731
 732         if (error_factor) {
 733                 priv->can.can_stats.bus_error++;
 734                 stats->rx_errors++;
 735
 736                 cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
 737
 738                 if (error_factor & M16C_EF_ACKE)
 739                         cf->data[3] |= (CAN_ERR_PROT_LOC_ACK);
 740                 if (error_factor & M16C_EF_CRCE)
 741                         cf->data[3] |= (CAN_ERR_PROT_LOC_CRC_SEQ |
 742                                         CAN_ERR_PROT_LOC_CRC_DEL);
 743                 if (error_factor & M16C_EF_FORME)
 744                         cf->data[2] |= CAN_ERR_PROT_FORM;
 745                 if (error_factor & M16C_EF_STFE)
 746                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 747                 if (error_factor & M16C_EF_BITE0)
 748                         cf->data[2] |= CAN_ERR_PROT_BIT0;
 749                 if (error_factor & M16C_EF_BITE1)
 750                         cf->data[2] |= CAN_ERR_PROT_BIT1;
 751                 if (error_factor & M16C_EF_TRE)
 752                         cf->data[2] |= CAN_ERR_PROT_TX;
 753         }
 754
 755         cf->data[6] = txerr;
 756         cf->data[7] = rxerr;
 757
 758         priv->bec.txerr = txerr;
 759         priv->bec.rxerr = rxerr;
 760
 761         priv->can.state = new_state;
 762
 763         netif_rx(skb);
 764
 765         stats->rx_packets++;
 766         stats->rx_bytes += cf->can_dlc;
 767 }
 768
 769 static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
 770                                   const struct kvaser_msg *msg)
 771 {
 772         struct can_frame *cf;
 773         struct sk_buff *skb;
 774         struct net_device_stats *stats = &priv->netdev->stats;
 775
 776         if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME |
 777                                          MSG_FLAG_NERR)) {
 778                 netdev_err(priv->netdev, "Unknow error (flags: 0x%02x)\n",
 779                            msg->u.rx_can.flag);
 780
 781                 stats->rx_errors++;
 782                 return;
 783         }
 784
 785         if (msg->u.rx_can.flag & MSG_FLAG_OVERRUN) {
 786                 skb = alloc_can_err_skb(priv->netdev, &cf);
 787                 if (!skb) {
 788                         stats->rx_dropped++;
 789                         return;
 790                 }
 791
 792                 cf->can_id |= CAN_ERR_CRTL;
 793                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 794
 795                 stats->rx_over_errors++;
 796                 stats->rx_errors++;
 797
 798                 netif_rx(skb);
 799
 800                 stats->rx_packets++;
 801                 stats->rx_bytes += cf->can_dlc;
 802         }
 803 }
 804
 805 static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
 806                                   const struct kvaser_msg *msg)
 807 {
 808         struct kvaser_usb_net_priv *priv;
 809         struct can_frame *cf;
 810         struct sk_buff *skb;
 811         struct net_device_stats *stats;
 812         u8 channel = msg->u.rx_can.channel;
 813
 814         if (channel >= dev->nchannels) {
 815                 dev_err(dev->udev->dev.parent,
 816                         "Invalid channel number (%d)\n", channel);
 817                 return;
 818         }
 819
 820         priv = dev->nets[channel];
 821         stats = &priv->netdev->stats;
 822
 823         if ((msg->u.rx_can.flag & MSG_FLAG_ERROR_FRAME) &&
 824             (msg->id == CMD_LOG_MESSAGE)) {
 825                 kvaser_usb_rx_error(dev, msg);
 826                 return;
 827         } else if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME |
 828                                          MSG_FLAG_NERR |
 829                                          MSG_FLAG_OVERRUN)) {
 830                 kvaser_usb_rx_can_err(priv, msg);
 831                 return;
 832         } else if (msg->u.rx_can.flag & ~MSG_FLAG_REMOTE_FRAME) {
 833                 netdev_warn(priv->netdev,
 834                             "Unhandled frame (flags: 0x%02x)",
 835                             msg->u.rx_can.flag);
 836                 return;
 837         }
 838
 839         skb = alloc_can_skb(priv->netdev, &cf);
 840         if (!skb) {
 841                 stats->tx_dropped++;
 842                 return;
 843         }
 844
 845         if (msg->id == CMD_LOG_MESSAGE) {
 846                 cf->can_id = le32_to_cpu(msg->u.log_message.id);
 847                 if (cf->can_id & KVASER_EXTENDED_FRAME)
 848                         cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
 849                 else
 850                         cf->can_id &= CAN_SFF_MASK;
 851
 852                 cf->can_dlc = get_can_dlc(msg->u.log_message.dlc);
 853
 854                 if (msg->u.log_message.flags & MSG_FLAG_REMOTE_FRAME)
 855                         cf->can_id |= CAN_RTR_FLAG;
 856                 else
 857                         memcpy(cf->data, &msg->u.log_message.data,
 858                                cf->can_dlc);
 859         } else {
 860                 cf->can_id = ((msg->u.rx_can.msg[0] & 0x1f) << 6) |
 861                              (msg->u.rx_can.msg[1] & 0x3f);
 862
 863                 if (msg->id == CMD_RX_EXT_MESSAGE) {
 864                         cf->can_id <<= 18;
 865                         cf->can_id |= ((msg->u.rx_can.msg[2] & 0x0f) << 14) |
 866                                       ((msg->u.rx_can.msg[3] & 0xff) << 6) |
 867                                       (msg->u.rx_can.msg[4] & 0x3f);
 868                         cf->can_id |= CAN_EFF_FLAG;
 869                 }
 870
 871                 cf->can_dlc = get_can_dlc(msg->u.rx_can.msg[5]);
 872
 873                 if (msg->u.rx_can.flag & MSG_FLAG_REMOTE_FRAME)
 874                         cf->can_id |= CAN_RTR_FLAG;
 875                 else
 876                         memcpy(cf->data, &msg->u.rx_can.msg[6],
 877                                cf->can_dlc);
 878         }
 879
 880         netif_rx(skb);
 881
 882         stats->rx_packets++;
 883         stats->rx_bytes += cf->can_dlc;
 884 }
 885
 886 static void kvaser_usb_start_chip_reply(const struct kvaser_usb *dev,
 887                                         const struct kvaser_msg *msg)
 888 {
 889         struct kvaser_usb_net_priv *priv;
 890         u8 channel = msg->u.simple.channel;
 891
 892         if (channel >= dev->nchannels) {
 893                 dev_err(dev->udev->dev.parent,
 894                         "Invalid channel number (%d)\n", channel);
 895                 return;
 896         }
 897
 898         priv = dev->nets[channel];
 899
 900         if (completion_done(&priv->start_comp) &&
 901             netif_queue_stopped(priv->netdev)) {
 902                 netif_wake_queue(priv->netdev);
 903         } else {
 904                 netif_start_queue(priv->netdev);
 905                 complete(&priv->start_comp);
 906         }
 907 }
 908
 909 static void kvaser_usb_stop_chip_reply(const struct kvaser_usb *dev,
 910                                        const struct kvaser_msg *msg)
 911 {
 912         struct kvaser_usb_net_priv *priv;
 913         u8 channel = msg->u.simple.channel;
 914
 915         if (channel >= dev->nchannels) {
 916                 dev_err(dev->udev->dev.parent,
 917                         "Invalid channel number (%d)\n", channel);
 918                 return;
 919         }
 920
 921         priv = dev->nets[channel];
 922
 923         complete(&priv->stop_comp);
 924 }
 925
 926 static void kvaser_usb_handle_message(const struct kvaser_usb *dev,
 927                                       const struct kvaser_msg *msg)
 928 {
 929         switch (msg->id) {
 930         case CMD_START_CHIP_REPLY:
 931                 kvaser_usb_start_chip_reply(dev, msg);
 932                 break;
 933
 934         case CMD_STOP_CHIP_REPLY:
 935                 kvaser_usb_stop_chip_reply(dev, msg);
 936                 break;
 937
 938         case CMD_RX_STD_MESSAGE:
 939         case CMD_RX_EXT_MESSAGE:
 940         case CMD_LOG_MESSAGE:
 941                 kvaser_usb_rx_can_msg(dev, msg);
 942                 break;
 943
 944         case CMD_CHIP_STATE_EVENT:
 945         case CMD_CAN_ERROR_EVENT:
 946                 kvaser_usb_rx_error(dev, msg);
 947                 break;
 948
 949         case CMD_TX_ACKNOWLEDGE:
 950                 kvaser_usb_tx_acknowledge(dev, msg);
 951                 break;
 952
 953         default:
 954                 dev_warn(dev->udev->dev.parent,
 955                          "Unhandled message (%d)\n", msg->id);
 956                 break;
 957         }
 958 }
 959
 960 static void kvaser_usb_read_bulk_callback(struct urb *urb)
 961 {
 962         struct kvaser_usb *dev = urb->context;
 963         struct kvaser_msg *msg;
 964         int pos = 0;
 965         int err, i;
 966
 967         switch (urb->status) {
 968         case 0:
 969                 break;
 970         case -ENOENT:
 971         case -ESHUTDOWN:
 972                 return;
 973         default:
 974                 dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n",
 975                          urb->status);
 976                 goto resubmit_urb;
 977         }
 978
 979         while (pos <= urb->actual_length - MSG_HEADER_LEN) {
 980                 msg = urb->transfer_buffer + pos;
 981
 982                 if (!msg->len)
 983                         break;
 984
 985                 if (pos + msg->len > urb->actual_length) {
 986                         dev_err(dev->udev->dev.parent, "Format error\n");
 987                         break;
 988                 }
 989
 990                 kvaser_usb_handle_message(dev, msg);
 991
 992                 pos += msg->len;
 993         }
 994
 995 resubmit_urb:
 996         usb_fill_bulk_urb(urb, dev->udev,
 997                           usb_rcvbulkpipe(dev->udev,
 998                                           dev->bulk_in->bEndpointAddress),
 999                           urb->transfer_buffer, RX_BUFFER_SIZE,
1000                           kvaser_usb_read_bulk_callback, dev);
1001
1002         err = usb_submit_urb(urb, GFP_ATOMIC);
1003         if (err == -ENODEV) {
1004                 for (i = 0; i < dev->nchannels; i++) {
1005                         if (!dev->nets[i])
1006                                 continue;
1007
1008                         netif_device_detach(dev->nets[i]->netdev);
1009                 }
1010         } else if (err) {
1011                 dev_err(dev->udev->dev.parent,
1012                         "Failed resubmitting read bulk urb: %d\n", err);
1013         }
1014
1015         return;
1016 }
1017
1018 static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
1019 {
1020         int i, err = 0;
1021
1022         if (dev->rxinitdone)
1023                 return 0;
1024
1025         for (i = 0; i < MAX_RX_URBS; i++) {
1026                 struct urb *urb = NULL;
1027                 u8 *buf = NULL;
1028                 dma_addr_t buf_dma;
1029
1030                 urb = usb_alloc_urb(0, GFP_KERNEL);
1031                 if (!urb) {
1032                         dev_warn(dev->udev->dev.parent,
1033                                  "No memory left for URBs\n");
1034                         err = -ENOMEM;
1035                         break;
1036                 }
1037
1038                 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE,
1039                                          GFP_KERNEL, &buf_dma);
1040                 if (!buf) {
1041                         dev_warn(dev->udev->dev.parent,
1042                                  "No memory left for USB buffer\n");
1043                         usb_free_urb(urb);
1044                         err = -ENOMEM;
1045                         break;
1046                 }
1047
1048                 usb_fill_bulk_urb(urb, dev->udev,
1049                                   usb_rcvbulkpipe(dev->udev,
1050                                           dev->bulk_in->bEndpointAddress),
1051                                   buf, RX_BUFFER_SIZE,
1052                                   kvaser_usb_read_bulk_callback,
1053                                   dev);
1054                 urb->transfer_dma = buf_dma;
1055                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1056                 usb_anchor_urb(urb, &dev->rx_submitted);
1057
1058                 err = usb_submit_urb(urb, GFP_KERNEL);
1059                 if (err) {
1060                         usb_unanchor_urb(urb);
1061                         usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
1062                                           buf_dma);
1063                         usb_free_urb(urb);
1064                         break;
1065                 }
1066
1067                 dev->rxbuf[i] = buf;
1068                 dev->rxbuf_dma[i] = buf_dma;
1069
1070                 usb_free_urb(urb);
1071         }
1072
1073         if (i == 0) {
1074                 dev_warn(dev->udev->dev.parent,
1075                          "Cannot setup read URBs, error %d\n", err);
1076                 return err;
1077         } else if (i < MAX_RX_URBS) {
1078                 dev_warn(dev->udev->dev.parent,
1079                          "RX performances may be slow\n");
1080         }
1081
1082         dev->rxinitdone = true;
1083
1084         return 0;
1085 }
1086
1087 static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1088 {
1089         struct kvaser_msg *msg;
1090         int rc;
1091
1092         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1093         if (!msg)
1094                 return -ENOMEM;
1095
1096         msg->id = CMD_SET_CTRL_MODE;
1097         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_ctrl_mode);
1098         msg->u.ctrl_mode.tid = 0xff;
1099         msg->u.ctrl_mode.channel = priv->channel;
1100
1101         if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1102                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1103         else
1104                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1105
1106         rc = kvaser_usb_send_msg(priv->dev, msg);
1107
1108         kfree(msg);
1109         return rc;
1110 }
1111
1112 static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv)
1113 {
1114         int err;
1115
1116         init_completion(&priv->start_comp);
1117
1118         err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP,
1119                                          priv->channel);
1120         if (err)
1121                 return err;
1122
1123         if (!wait_for_completion_timeout(&priv->start_comp,
1124                                          msecs_to_jiffies(START_TIMEOUT)))
1125                 return -ETIMEDOUT;
1126
1127         return 0;
1128 }
1129
1130 static int kvaser_usb_open(struct net_device *netdev)
1131 {
1132         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1133         struct kvaser_usb *dev = priv->dev;
1134         int err;
1135
1136         err = open_candev(netdev);
1137         if (err)
1138                 return err;
1139
1140         err = kvaser_usb_setup_rx_urbs(dev);
1141         if (err)
1142                 goto error;
1143
1144         err = kvaser_usb_set_opt_mode(priv);
1145         if (err)
1146                 goto error;
1147
1148         err = kvaser_usb_start_chip(priv);
1149         if (err) {
1150                 netdev_warn(netdev, "Cannot start device, error %d\n", err);
1151                 goto error;
1152         }
1153
1154         priv->can.state = CAN_STATE_ERROR_ACTIVE;
1155
1156         return 0;
1157
1158 error:
1159         close_candev(netdev);
1160         return err;
1161 }
1162
1163 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
1164 {
1165         int i;
1166
1167         usb_kill_anchored_urbs(&dev->rx_submitted);
1168
1169         for (i = 0; i < MAX_RX_URBS; i++)
1170                 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
1171                                   dev->rxbuf[i],
1172                                   dev->rxbuf_dma[i]);
1173
1174         for (i = 0; i < MAX_NET_DEVICES; i++) {
1175                 struct kvaser_usb_net_priv *priv = dev->nets[i];
1176
1177                 if (priv)
1178                         kvaser_usb_unlink_tx_urbs(priv);
1179         }
1180 }
1181
1182 static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv)
1183 {
1184         int err;
1185
1186         init_completion(&priv->stop_comp);
1187
1188         err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP,
1189                                          priv->channel);
1190         if (err)
1191                 return err;
1192
1193         if (!wait_for_completion_timeout(&priv->stop_comp,
1194                                          msecs_to_jiffies(STOP_TIMEOUT)))
1195                 return -ETIMEDOUT;
1196
1197         return 0;
1198 }
1199
1200 static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv)
1201 {
1202         struct kvaser_msg *msg;
1203         int rc;
1204
1205         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1206         if (!msg)
1207                 return -ENOMEM;
1208
1209         msg->id = CMD_FLUSH_QUEUE;
1210         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_flush_queue);
1211         msg->u.flush_queue.channel = priv->channel;
1212         msg->u.flush_queue.flags = 0x00;
1213
1214         rc = kvaser_usb_send_msg(priv->dev, msg);
1215
1216         kfree(msg);
1217         return rc;
1218 }
1219
1220 static int kvaser_usb_close(struct net_device *netdev)
1221 {
1222         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1223         struct kvaser_usb *dev = priv->dev;
1224         int err;
1225
1226         netif_stop_queue(netdev);
1227
1228         err = kvaser_usb_flush_queue(priv);
1229         if (err)
1230                 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
1231
1232         if (kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel))
1233                 netdev_warn(netdev, "Cannot reset card, error %d\n", err);
1234
1235         err = kvaser_usb_stop_chip(priv);
1236         if (err)
1237                 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
1238
1239         priv->can.state = CAN_STATE_STOPPED;
1240         close_candev(priv->netdev);
1241
1242         return 0;
1243 }
1244
1245 static void kvaser_usb_write_bulk_callback(struct urb *urb)
1246 {
1247         struct kvaser_usb_tx_urb_context *context = urb->context;
1248         struct kvaser_usb_net_priv *priv;
1249         struct net_device *netdev;
1250
1251         if (WARN_ON(!context))
1252                 return;
1253
1254         priv = context->priv;
1255         netdev = priv->netdev;
1256
1257         kfree(urb->transfer_buffer);
1258
1259         if (!netif_device_present(netdev))
1260                 return;
1261
1262         if (urb->status)
1263                 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1264 }
1265
1266 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1267                                          struct net_device *netdev)
1268 {
1269         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1270         struct kvaser_usb *dev = priv->dev;
1271         struct net_device_stats *stats = &netdev->stats;
1272         struct can_frame *cf = (struct can_frame *)skb->data;
1273         struct kvaser_usb_tx_urb_context *context = NULL;
1274         struct urb *urb;
1275         void *buf;
1276         struct kvaser_msg *msg;
1277         int i, err;
1278         int ret = NETDEV_TX_OK;
1279
1280         if (can_dropped_invalid_skb(netdev, skb))
1281                 return NETDEV_TX_OK;
1282
1283         urb = usb_alloc_urb(0, GFP_ATOMIC);
1284         if (!urb) {
1285                 netdev_err(netdev, "No memory left for URBs\n");
1286                 stats->tx_dropped++;
1287                 goto nourbmem;
1288         }
1289
1290         buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1291         if (!buf) {
1292                 stats->tx_dropped++;
1293                 goto nobufmem;
1294         }
1295
1296         msg = buf;
1297         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
1298         msg->u.tx_can.flags = 0;
1299         msg->u.tx_can.channel = priv->channel;
1300
1301         if (cf->can_id & CAN_EFF_FLAG) {
1302                 msg->id = CMD_TX_EXT_MESSAGE;
1303                 msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
1304                 msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
1305                 msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
1306                 msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
1307                 msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
1308         } else {
1309                 msg->id = CMD_TX_STD_MESSAGE;
1310                 msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
1311                 msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
1312         }
1313
1314         msg->u.tx_can.msg[5] = cf->can_dlc;
1315         memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
1316
1317         if (cf->can_id & CAN_RTR_FLAG)
1318                 msg->u.tx_can.flags |= MSG_FLAG_REMOTE_FRAME;
1319
1320         for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++) {
1321                 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
1322                         context = &priv->tx_contexts[i];
1323                         break;
1324                 }
1325         }
1326
1327         if (!context) {
1328                 netdev_warn(netdev, "cannot find free context\n");
1329                 ret =  NETDEV_TX_BUSY;
1330                 goto releasebuf;
1331         }
1332
1333         context->priv = priv;
1334         context->echo_index = i;
1335         context->dlc = cf->can_dlc;
1336
1337         msg->u.tx_can.tid = context->echo_index;
1338
1339         usb_fill_bulk_urb(urb, dev->udev,
1340                           usb_sndbulkpipe(dev->udev,
1341                                           dev->bulk_out->bEndpointAddress),
1342                           buf, msg->len,
1343                           kvaser_usb_write_bulk_callback, context);
1344         usb_anchor_urb(urb, &priv->tx_submitted);
1345
1346         can_put_echo_skb(skb, netdev, context->echo_index);
1347
1348         atomic_inc(&priv->active_tx_urbs);
1349
1350         if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS)
1351                 netif_stop_queue(netdev);
1352
1353         err = usb_submit_urb(urb, GFP_ATOMIC);
1354         if (unlikely(err)) {
1355                 can_free_echo_skb(netdev, context->echo_index);
1356
1357                 skb = NULL; /* set to NULL to avoid double free in
1358                              * dev_kfree_skb(skb) */
1359
1360                 atomic_dec(&priv->active_tx_urbs);
1361                 usb_unanchor_urb(urb);
1362
1363                 stats->tx_dropped++;
1364
1365                 if (err == -ENODEV)
1366                         netif_device_detach(netdev);
1367                 else
1368                         netdev_warn(netdev, "Failed tx_urb %d\n", err);
1369
1370                 goto releasebuf;
1371         }
1372
1373         usb_free_urb(urb);
1374
1375         return NETDEV_TX_OK;
1376
1377 releasebuf:
1378         kfree(buf);
1379 nobufmem:
1380         usb_free_urb(urb);
1381 nourbmem:
1382         dev_kfree_skb(skb);
1383         return ret;
1384 }
1385
1386 static const struct net_device_ops kvaser_usb_netdev_ops = {
1387         .ndo_open = kvaser_usb_open,
1388         .ndo_stop = kvaser_usb_close,
1389         .ndo_start_xmit = kvaser_usb_start_xmit,
1390 };
1391
1392 static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1393         .name = "kvaser_usb",
1394         .tseg1_min = KVASER_USB_TSEG1_MIN,
1395         .tseg1_max = KVASER_USB_TSEG1_MAX,
1396         .tseg2_min = KVASER_USB_TSEG2_MIN,
1397         .tseg2_max = KVASER_USB_TSEG2_MAX,
1398         .sjw_max = KVASER_USB_SJW_MAX,
1399         .brp_min = KVASER_USB_BRP_MIN,
1400         .brp_max = KVASER_USB_BRP_MAX,
1401         .brp_inc = KVASER_USB_BRP_INC,
1402 };
1403
1404 static int kvaser_usb_set_bittiming(struct net_device *netdev)
1405 {
1406         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1407         struct can_bittiming *bt = &priv->can.bittiming;
1408         struct kvaser_usb *dev = priv->dev;
1409         struct kvaser_msg *msg;
1410         int rc;
1411
1412         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1413         if (!msg)
1414                 return -ENOMEM;
1415
1416         msg->id = CMD_SET_BUS_PARAMS;
1417         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1418         msg->u.busparams.channel = priv->channel;
1419         msg->u.busparams.tid = 0xff;
1420         msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1421         msg->u.busparams.sjw = bt->sjw;
1422         msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1423         msg->u.busparams.tseg2 = bt->phase_seg2;
1424
1425         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1426                 msg->u.busparams.no_samp = 3;
1427         else
1428                 msg->u.busparams.no_samp = 1;
1429
1430         rc = kvaser_usb_send_msg(dev, msg);
1431
1432         kfree(msg);
1433         return rc;
1434 }
1435
1436 static int kvaser_usb_set_mode(struct net_device *netdev,
1437                                enum can_mode mode)
1438 {
1439         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1440         int err;
1441
1442         switch (mode) {
1443         case CAN_MODE_START:
1444                 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1445                 if (err)
1446                         return err;
1447                 break;
1448         default:
1449                 return -EOPNOTSUPP;
1450         }
1451
1452         return 0;
1453 }
1454
1455 static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1456                                        struct can_berr_counter *bec)
1457 {
1458         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1459
1460         *bec = priv->bec;
1461
1462         return 0;
1463 }
1464
1465 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1466 {
1467         int i;
1468
1469         for (i = 0; i < dev->nchannels; i++) {
1470                 if (!dev->nets[i])
1471                         continue;
1472
1473                 unregister_netdev(dev->nets[i]->netdev);
1474         }
1475
1476         kvaser_usb_unlink_all_urbs(dev);
1477
1478         for (i = 0; i < dev->nchannels; i++) {
1479                 if (!dev->nets[i])
1480                         continue;
1481
1482                 free_candev(dev->nets[i]->netdev);
1483         }
1484 }
1485
1486 static int kvaser_usb_init_one(struct usb_interface *intf,
1487                                const struct usb_device_id *id, int channel)
1488 {
1489         struct kvaser_usb *dev = usb_get_intfdata(intf);
1490         struct net_device *netdev;
1491         struct kvaser_usb_net_priv *priv;
1492         int i, err;
1493
1494         netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
1495         if (!netdev) {
1496                 dev_err(&intf->dev, "Cannot alloc candev\n");
1497                 return -ENOMEM;
1498         }
1499
1500         priv = netdev_priv(netdev);
1501
1502         init_completion(&priv->start_comp);
1503         init_completion(&priv->stop_comp);
1504
1505         init_usb_anchor(&priv->tx_submitted);
1506         atomic_set(&priv->active_tx_urbs, 0);
1507
1508         for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++)
1509                 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
1510
1511         priv->dev = dev;
1512         priv->netdev = netdev;
1513         priv->channel = channel;
1514
1515         priv->can.state = CAN_STATE_STOPPED;
1516         priv->can.clock.freq = CAN_USB_CLOCK;
1517         priv->can.bittiming_const = &kvaser_usb_bittiming_const;
1518         priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
1519         priv->can.do_set_mode = kvaser_usb_set_mode;
1520         if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
1521                 priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
1522         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
1523         if (id->driver_info & KVASER_HAS_SILENT_MODE)
1524                 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1525
1526         netdev->flags |= IFF_ECHO;
1527
1528         netdev->netdev_ops = &kvaser_usb_netdev_ops;
1529
1530         SET_NETDEV_DEV(netdev, &intf->dev);
1531
1532         dev->nets[channel] = priv;
1533
1534         err = register_candev(netdev);
1535         if (err) {
1536                 dev_err(&intf->dev, "Failed to register can device\n");
1537                 free_candev(netdev);
1538                 dev->nets[channel] = NULL;
1539                 return err;
1540         }
1541
1542         netdev_dbg(netdev, "device registered\n");
1543
1544         return 0;
1545 }
1546
1547 static void kvaser_usb_get_endpoints(const struct usb_interface *intf,
1548                                      struct usb_endpoint_descriptor **in,
1549                                      struct usb_endpoint_descriptor **out)
1550 {
1551         const struct usb_host_interface *iface_desc;
1552         struct usb_endpoint_descriptor *endpoint;
1553         int i;
1554
1555         iface_desc = &intf->altsetting[0];
1556
1557         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1558                 endpoint = &iface_desc->endpoint[i].desc;
1559
1560                 if (usb_endpoint_is_bulk_in(endpoint))
1561                         *in = endpoint;
1562
1563                 if (usb_endpoint_is_bulk_out(endpoint))
1564                         *out = endpoint;
1565         }
1566 }
1567
1568 static int kvaser_usb_probe(struct usb_interface *intf,
1569                             const struct usb_device_id *id)
1570 {
1571         struct kvaser_usb *dev;
1572         int err = -ENOMEM;
1573         int i;
1574
1575         dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
1576         if (!dev)
1577                 return -ENOMEM;
1578
1579         kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
1580         if (!dev->bulk_in || !dev->bulk_out) {
1581                 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
1582                 return err;
1583         }
1584
1585         dev->udev = interface_to_usbdev(intf);
1586
1587         init_usb_anchor(&dev->rx_submitted);
1588
1589         usb_set_intfdata(intf, dev);
1590
1591         for (i = 0; i < MAX_NET_DEVICES; i++)
1592                 kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, i);
1593
1594         err = kvaser_usb_get_software_info(dev);
1595         if (err) {
1596                 dev_err(&intf->dev,
1597                         "Cannot get software infos, error %d\n", err);
1598                 return err;
1599         }
1600
1601         err = kvaser_usb_get_card_info(dev);
1602         if (err) {
1603                 dev_err(&intf->dev,
1604                         "Cannot get card infos, error %d\n", err);
1605                 return err;
1606         }
1607
1608         dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
1609                 ((dev->fw_version >> 24) & 0xff),
1610                 ((dev->fw_version >> 16) & 0xff),
1611                 (dev->fw_version & 0xffff));
1612
1613         for (i = 0; i < dev->nchannels; i++) {
1614                 err = kvaser_usb_init_one(intf, id, i);
1615                 if (err) {
1616                         kvaser_usb_remove_interfaces(dev);
1617                         return err;
1618                 }
1619         }
1620
1621         return 0;
1622 }
1623
1624 static void kvaser_usb_disconnect(struct usb_interface *intf)
1625 {
1626         struct kvaser_usb *dev = usb_get_intfdata(intf);
1627
1628         usb_set_intfdata(intf, NULL);
1629
1630         if (!dev)
1631                 return;
1632
1633         kvaser_usb_remove_interfaces(dev);
1634 }
1635
1636 static struct usb_driver kvaser_usb_driver = {
1637         .name = "kvaser_usb",
1638         .probe = kvaser_usb_probe,
1639         .disconnect = kvaser_usb_disconnect,
1640         .id_table = kvaser_usb_table,
1641 };
1642
1643 module_usb_driver(kvaser_usb_driver);
1644
1645 MODULE_AUTHOR("Olivier Sobrie <[email protected]>");
1646 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
1647 MODULE_LICENSE("GPL v2");