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 <matthias.fuchs@esd.eu>, esd gmbh
  12  * Copyright (C) 2012 Olivier Sobrie <olivier@sobrie.be>
  13  */
  14
  15 #include <linux/completion.h>
  16 #include <linux/module.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/usb.h>
  19
  20 #include <linux/can.h>
  21 #include <linux/can/dev.h>
  22 #include <linux/can/error.h>
  23
  24 #define MAX_TX_URBS                     16
  25 #define MAX_RX_URBS                     4
  26 #define START_TIMEOUT                   1000 /* msecs */
  27 #define STOP_TIMEOUT                    1000 /* msecs */
  28 #define USB_SEND_TIMEOUT                1000 /* msecs */
  29 #define USB_RECV_TIMEOUT                1000 /* msecs */
  30 #define RX_BUFFER_SIZE                  3072
  31 #define CAN_USB_CLOCK                   8000000
  32 #define MAX_NET_DEVICES                 3
  33
  34 /* Kvaser USB devices */
  35 #define KVASER_VENDOR_ID                0x0bfd
  36 #define USB_LEAF_DEVEL_PRODUCT_ID       10
  37 #define USB_LEAF_LITE_PRODUCT_ID        11
  38 #define USB_LEAF_PRO_PRODUCT_ID         12
  39 #define USB_LEAF_SPRO_PRODUCT_ID        14
  40 #define USB_LEAF_PRO_LS_PRODUCT_ID      15
  41 #define USB_LEAF_PRO_SWC_PRODUCT_ID     16
  42 #define USB_LEAF_PRO_LIN_PRODUCT_ID     17
  43 #define USB_LEAF_SPRO_LS_PRODUCT_ID     18
  44 #define USB_LEAF_SPRO_SWC_PRODUCT_ID    19
  45 #define USB_MEMO2_DEVEL_PRODUCT_ID      22
  46 #define USB_MEMO2_HSHS_PRODUCT_ID       23
  47 #define USB_UPRO_HSHS_PRODUCT_ID        24
  48 #define USB_LEAF_LITE_GI_PRODUCT_ID     25
  49 #define USB_LEAF_PRO_OBDII_PRODUCT_ID   26
  50 #define USB_MEMO2_HSLS_PRODUCT_ID       27
  51 #define USB_LEAF_LITE_CH_PRODUCT_ID     28
  52 #define USB_BLACKBIRD_SPRO_PRODUCT_ID   29
  53 #define USB_OEM_MERCURY_PRODUCT_ID      34
  54 #define USB_OEM_LEAF_PRODUCT_ID         35
  55 #define USB_CAN_R_PRODUCT_ID            39
  56 #define USB_LEAF_LITE_V2_PRODUCT_ID     288
  57 #define USB_MINI_PCIE_HS_PRODUCT_ID     289
  58
  59 /* USB devices features */
  60 #define KVASER_HAS_SILENT_MODE          BIT(0)
  61 #define KVASER_HAS_TXRX_ERRORS          BIT(1)
  62
  63 /* Message header size */
  64 #define MSG_HEADER_LEN                  2
  65
  66 /* Can message flags */
  67 #define MSG_FLAG_ERROR_FRAME            BIT(0)
  68 #define MSG_FLAG_OVERRUN                BIT(1)
  69 #define MSG_FLAG_NERR                   BIT(2)
  70 #define MSG_FLAG_WAKEUP                 BIT(3)
  71 #define MSG_FLAG_REMOTE_FRAME           BIT(4)
  72 #define MSG_FLAG_RESERVED               BIT(5)
  73 #define MSG_FLAG_TX_ACK                 BIT(6)
  74 #define MSG_FLAG_TX_REQUEST             BIT(7)
  75
  76 /* Can states */
  77 #define M16C_STATE_BUS_RESET            BIT(0)
  78 #define M16C_STATE_BUS_ERROR            BIT(4)
  79 #define M16C_STATE_BUS_PASSIVE          BIT(5)
  80 #define M16C_STATE_BUS_OFF              BIT(6)
  81
  82 /* Can msg ids */
  83 #define CMD_RX_STD_MESSAGE              12
  84 #define CMD_TX_STD_MESSAGE              13
  85 #define CMD_RX_EXT_MESSAGE              14
  86 #define CMD_TX_EXT_MESSAGE              15
  87 #define CMD_SET_BUS_PARAMS              16
  88 #define CMD_GET_BUS_PARAMS              17
  89 #define CMD_GET_BUS_PARAMS_REPLY        18
  90 #define CMD_GET_CHIP_STATE              19
  91 #define CMD_CHIP_STATE_EVENT            20
  92 #define CMD_SET_CTRL_MODE               21
  93 #define CMD_GET_CTRL_MODE               22
  94 #define CMD_GET_CTRL_MODE_REPLY         23
  95 #define CMD_RESET_CHIP                  24
  96 #define CMD_RESET_CARD                  25
  97 #define CMD_START_CHIP                  26
  98 #define CMD_START_CHIP_REPLY            27
  99 #define CMD_STOP_CHIP                   28
 100 #define CMD_STOP_CHIP_REPLY             29
 101 #define CMD_GET_CARD_INFO2              32
 102 #define CMD_GET_CARD_INFO               34
 103 #define CMD_GET_CARD_INFO_REPLY         35
 104 #define CMD_GET_SOFTWARE_INFO           38
 105 #define CMD_GET_SOFTWARE_INFO_REPLY     39
 106 #define CMD_ERROR_EVENT                 45
 107 #define CMD_FLUSH_QUEUE                 48
 108 #define CMD_RESET_ERROR_COUNTER         49
 109 #define CMD_TX_ACKNOWLEDGE              50
 110 #define CMD_CAN_ERROR_EVENT             51
 111 #define CMD_USB_THROTTLE                77
 112 #define CMD_LOG_MESSAGE                 106
 113
 114 /* error factors */
 115 #define M16C_EF_ACKE                    BIT(0)
 116 #define M16C_EF_CRCE                    BIT(1)
 117 #define M16C_EF_FORME                   BIT(2)
 118 #define M16C_EF_STFE                    BIT(3)
 119 #define M16C_EF_BITE0                   BIT(4)
 120 #define M16C_EF_BITE1                   BIT(5)
 121 #define M16C_EF_RCVE                    BIT(6)
 122 #define M16C_EF_TRE                     BIT(7)
 123
 124 /* bittiming parameters */
 125 #define KVASER_USB_TSEG1_MIN            1
 126 #define KVASER_USB_TSEG1_MAX            16
 127 #define KVASER_USB_TSEG2_MIN            1
 128 #define KVASER_USB_TSEG2_MAX            8
 129 #define KVASER_USB_SJW_MAX              4
 130 #define KVASER_USB_BRP_MIN              1
 131 #define KVASER_USB_BRP_MAX              64
 132 #define KVASER_USB_BRP_INC              1
 133
 134 /* ctrl modes */
 135 #define KVASER_CTRL_MODE_NORMAL         1
 136 #define KVASER_CTRL_MODE_SILENT         2
 137 #define KVASER_CTRL_MODE_SELFRECEPTION  3
 138 #define KVASER_CTRL_MODE_OFF            4
 139
 140 /* log message */
 141 #define KVASER_EXTENDED_FRAME           BIT(31)
 142
 143 struct kvaser_msg_simple {
 144         u8 tid;
 145         u8 channel;
 146 } __packed;
 147
 148 struct kvaser_msg_cardinfo {
 149         u8 tid;
 150         u8 nchannels;
 151         __le32 serial_number;
 152         __le32 padding;
 153         __le32 clock_resolution;
 154         __le32 mfgdate;
 155         u8 ean[8];
 156         u8 hw_revision;
 157         u8 usb_hs_mode;
 158         __le16 padding2;
 159 } __packed;
 160
 161 struct kvaser_msg_cardinfo2 {
 162         u8 tid;
 163         u8 channel;
 164         u8 pcb_id[24];
 165         __le32 oem_unlock_code;
 166 } __packed;
 167
 168 struct kvaser_msg_softinfo {
 169         u8 tid;
 170         u8 channel;
 171         __le32 sw_options;
 172         __le32 fw_version;
 173         __le16 max_outstanding_tx;
 174         __le16 padding[9];
 175 } __packed;
 176
 177 struct kvaser_msg_busparams {
 178         u8 tid;
 179         u8 channel;
 180         __le32 bitrate;
 181         u8 tseg1;
 182         u8 tseg2;
 183         u8 sjw;
 184         u8 no_samp;
 185 } __packed;
 186
 187 struct kvaser_msg_tx_can {
 188         u8 channel;
 189         u8 tid;
 190         u8 msg[14];
 191         u8 padding;
 192         u8 flags;
 193 } __packed;
 194
 195 struct kvaser_msg_rx_can {
 196         u8 channel;
 197         u8 flag;
 198         __le16 time[3];
 199         u8 msg[14];
 200 } __packed;
 201
 202 struct kvaser_msg_chip_state_event {
 203         u8 tid;
 204         u8 channel;
 205         __le16 time[3];
 206         u8 tx_errors_count;
 207         u8 rx_errors_count;
 208         u8 status;
 209         u8 padding[3];
 210 } __packed;
 211
 212 struct kvaser_msg_tx_acknowledge {
 213         u8 channel;
 214         u8 tid;
 215         __le16 time[3];
 216         u8 flags;
 217         u8 time_offset;
 218 } __packed;
 219
 220 struct kvaser_msg_error_event {
 221         u8 tid;
 222         u8 flags;
 223         __le16 time[3];
 224         u8 channel;
 225         u8 padding;
 226         u8 tx_errors_count;
 227         u8 rx_errors_count;
 228         u8 status;
 229         u8 error_factor;
 230 } __packed;
 231
 232 struct kvaser_msg_ctrl_mode {
 233         u8 tid;
 234         u8 channel;
 235         u8 ctrl_mode;
 236         u8 padding[3];
 237 } __packed;
 238
 239 struct kvaser_msg_flush_queue {
 240         u8 tid;
 241         u8 channel;
 242         u8 flags;
 243         u8 padding[3];
 244 } __packed;
 245
 246 struct kvaser_msg_log_message {
 247         u8 channel;
 248         u8 flags;
 249         __le16 time[3];
 250         u8 dlc;
 251         u8 time_offset;
 252         __le32 id;
 253         u8 data[8];
 254 } __packed;
 255
 256 struct kvaser_msg {
 257         u8 len;
 258         u8 id;
 259         union   {
 260                 struct kvaser_msg_simple simple;
 261                 struct kvaser_msg_cardinfo cardinfo;
 262                 struct kvaser_msg_cardinfo2 cardinfo2;
 263                 struct kvaser_msg_softinfo softinfo;
 264                 struct kvaser_msg_busparams busparams;
 265                 struct kvaser_msg_tx_can tx_can;
 266                 struct kvaser_msg_rx_can rx_can;
 267                 struct kvaser_msg_chip_state_event chip_state_event;
 268                 struct kvaser_msg_tx_acknowledge tx_acknowledge;
 269                 struct kvaser_msg_error_event error_event;
 270                 struct kvaser_msg_ctrl_mode ctrl_mode;
 271                 struct kvaser_msg_flush_queue flush_queue;
 272                 struct kvaser_msg_log_message log_message;
 273         } u;
 274 } __packed;
 275
 276 struct kvaser_usb_tx_urb_context {
 277         struct kvaser_usb_net_priv *priv;
 278         u32 echo_index;
 279         int dlc;
 280 };
 281
 282 struct kvaser_usb {
 283         struct usb_device *udev;
 284         struct kvaser_usb_net_priv *nets[MAX_NET_DEVICES];
 285
 286         struct usb_endpoint_descriptor *bulk_in, *bulk_out;
 287         struct usb_anchor rx_submitted;
 288
 289         u32 fw_version;
 290         unsigned int nchannels;
 291
 292         bool rxinitdone;
 293         void *rxbuf[MAX_RX_URBS];
 294         dma_addr_t rxbuf_dma[MAX_RX_URBS];
 295 };
 296
 297 struct kvaser_usb_net_priv {
 298         struct can_priv can;
 299
 300         atomic_t active_tx_urbs;
 301         struct usb_anchor tx_submitted;
 302         struct kvaser_usb_tx_urb_context tx_contexts[MAX_TX_URBS];
 303
 304         struct completion start_comp, stop_comp;
 305
 306         struct kvaser_usb *dev;
 307         struct net_device *netdev;
 308         int channel;
 309
 310         struct can_berr_counter bec;
 311 };
 312
 313 static const struct usb_device_id kvaser_usb_table[] = {
 314         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
 315         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
 316         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
 317                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 318                                KVASER_HAS_SILENT_MODE },
 319         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
 320                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 321                                KVASER_HAS_SILENT_MODE },
 322         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
 323                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 324                                KVASER_HAS_SILENT_MODE },
 325         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
 326                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 327                                KVASER_HAS_SILENT_MODE },
 328         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
 329                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 330                                KVASER_HAS_SILENT_MODE },
 331         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
 332                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 333                                KVASER_HAS_SILENT_MODE },
 334         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
 335                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 336                                KVASER_HAS_SILENT_MODE },
 337         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
 338                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 339                                KVASER_HAS_SILENT_MODE },
 340         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
 341                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 342                                KVASER_HAS_SILENT_MODE },
 343         { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
 344                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 345         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
 346         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
 347                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 348                                KVASER_HAS_SILENT_MODE },
 349         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
 350                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 351         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
 352                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 353         { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
 354                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 355         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
 356                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 357         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
 358                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 359         { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
 360                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 361         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID) },
 362         { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID) },
 363         { }
 364 };
 365 MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
 366
 367 static inline int kvaser_usb_send_msg(const struct kvaser_usb *dev,
 368                                       struct kvaser_msg *msg)
 369 {
 370         int actual_len;
 371
 372         return usb_bulk_msg(dev->udev,
 373                             usb_sndbulkpipe(dev->udev,
 374                                         dev->bulk_out->bEndpointAddress),
 375                             msg, msg->len, &actual_len,
 376                             USB_SEND_TIMEOUT);
 377 }
 378
 379 static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id,
 380                                struct kvaser_msg *msg)
 381 {
 382         struct kvaser_msg *tmp;
 383         void *buf;
 384         int actual_len;
 385         int err;
 386         int pos;
 387         unsigned long to = jiffies + msecs_to_jiffies(USB_RECV_TIMEOUT);
 388
 389         buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL);
 390         if (!buf)
 391                 return -ENOMEM;
 392
 393         do {
 394                 err = usb_bulk_msg(dev->udev,
 395                                    usb_rcvbulkpipe(dev->udev,
 396                                         dev->bulk_in->bEndpointAddress),
 397                                    buf, RX_BUFFER_SIZE, &actual_len,
 398                                    USB_RECV_TIMEOUT);
 399                 if (err < 0)
 400                         goto end;
 401
 402                 pos = 0;
 403                 while (pos <= actual_len - MSG_HEADER_LEN) {
 404                         tmp = buf + pos;
 405
 406                         if (!tmp->len)
 407                                 break;
 408
 409                         if (pos + tmp->len > actual_len) {
 410                                 dev_err(dev->udev->dev.parent,
 411                                         "Format error\n");
 412                                 break;
 413                         }
 414
 415                         if (tmp->id == id) {
 416                                 memcpy(msg, tmp, tmp->len);
 417                                 goto end;
 418                         }
 419
 420                         pos += tmp->len;
 421                 }
 422         } while (time_before(jiffies, to));
 423
 424         err = -EINVAL;
 425
 426 end:
 427         kfree(buf);
 428
 429         return err;
 430 }
 431
 432 static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev,
 433                                       u8 msg_id, int channel)
 434 {
 435         struct kvaser_msg *msg;
 436         int rc;
 437
 438         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
 439         if (!msg)
 440                 return -ENOMEM;
 441
 442         msg->id = msg_id;
 443         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 444         msg->u.simple.channel = channel;
 445         msg->u.simple.tid = 0xff;
 446
 447         rc = kvaser_usb_send_msg(dev, msg);
 448
 449         kfree(msg);
 450         return rc;
 451 }
 452
 453 static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
 454 {
 455         struct kvaser_msg msg;
 456         int err;
 457
 458         err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0);
 459         if (err)
 460                 return err;
 461
 462         err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg);
 463         if (err)
 464                 return err;
 465
 466         dev->fw_version = le32_to_cpu(msg.u.softinfo.fw_version);
 467
 468         return 0;
 469 }
 470
 471 static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
 472 {
 473         struct kvaser_msg msg;
 474         int err;
 475
 476         err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0);
 477         if (err)
 478                 return err;
 479
 480         err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg);
 481         if (err)
 482                 return err;
 483
 484         dev->nchannels = msg.u.cardinfo.nchannels;
 485         if (dev->nchannels > MAX_NET_DEVICES)
 486                 return -EINVAL;
 487
 488         return 0;
 489 }
 490
 491 static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
 492                                       const struct kvaser_msg *msg)
 493 {
 494         struct net_device_stats *stats;
 495         struct kvaser_usb_tx_urb_context *context;
 496         struct kvaser_usb_net_priv *priv;
 497         struct sk_buff *skb;
 498         struct can_frame *cf;
 499         u8 channel = msg->u.tx_acknowledge.channel;
 500         u8 tid = msg->u.tx_acknowledge.tid;
 501
 502         if (channel >= dev->nchannels) {
 503                 dev_err(dev->udev->dev.parent,
 504                         "Invalid channel number (%d)\n", channel);
 505                 return;
 506         }
 507
 508         priv = dev->nets[channel];
 509
 510         if (!netif_device_present(priv->netdev))
 511                 return;
 512
 513         stats = &priv->netdev->stats;
 514
 515         context = &priv->tx_contexts[tid % MAX_TX_URBS];
 516
 517         /* Sometimes the state change doesn't come after a bus-off event */
 518         if (priv->can.restart_ms &&
 519             (priv->can.state >= CAN_STATE_BUS_OFF)) {
 520                 skb = alloc_can_err_skb(priv->netdev, &cf);
 521                 if (skb) {
 522                         cf->can_id |= CAN_ERR_RESTARTED;
 523                         netif_rx(skb);
 524
 525                         stats->rx_packets++;
 526                         stats->rx_bytes += cf->can_dlc;
 527                 } else {
 528                         netdev_err(priv->netdev,
 529                                    "No memory left for err_skb\n");
 530                 }
 531
 532                 priv->can.can_stats.restarts++;
 533                 netif_carrier_on(priv->netdev);
 534
 535                 priv->can.state = CAN_STATE_ERROR_ACTIVE;
 536         }
 537
 538         stats->tx_packets++;
 539         stats->tx_bytes += context->dlc;
 540         can_get_echo_skb(priv->netdev, context->echo_index);
 541
 542         context->echo_index = MAX_TX_URBS;
 543         atomic_dec(&priv->active_tx_urbs);
 544
 545         netif_wake_queue(priv->netdev);
 546 }
 547
 548 static void kvaser_usb_simple_msg_callback(struct urb *urb)
 549 {
 550         struct net_device *netdev = urb->context;
 551
 552         kfree(urb->transfer_buffer);
 553
 554         if (urb->status)
 555                 netdev_warn(netdev, "urb status received: %d\n",
 556                             urb->status);
 557 }
 558
 559 static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
 560                                        u8 msg_id)
 561 {
 562         struct kvaser_usb *dev = priv->dev;
 563         struct net_device *netdev = priv->netdev;
 564         struct kvaser_msg *msg;
 565         struct urb *urb;
 566         void *buf;
 567         int err;
 568
 569         urb = usb_alloc_urb(0, GFP_ATOMIC);
 570         if (!urb) {
 571                 netdev_err(netdev, "No memory left for URBs\n");
 572                 return -ENOMEM;
 573         }
 574
 575         buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
 576         if (!buf) {
 577                 usb_free_urb(urb);
 578                 return -ENOMEM;
 579         }
 580
 581         msg = (struct kvaser_msg *)buf;
 582         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 583         msg->id = msg_id;
 584         msg->u.simple.channel = priv->channel;
 585
 586         usb_fill_bulk_urb(urb, dev->udev,
 587                           usb_sndbulkpipe(dev->udev,
 588                                           dev->bulk_out->bEndpointAddress),
 589                           buf, msg->len,
 590                           kvaser_usb_simple_msg_callback, priv);
 591         usb_anchor_urb(urb, &priv->tx_submitted);
 592
 593         err = usb_submit_urb(urb, GFP_ATOMIC);
 594         if (err) {
 595                 netdev_err(netdev, "Error transmitting URB\n");
 596                 usb_unanchor_urb(urb);
 597                 usb_free_urb(urb);
 598                 kfree(buf);
 599                 return err;
 600         }
 601
 602         usb_free_urb(urb);
 603
 604         return 0;
 605 }
 606
 607 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
 608 {
 609         int i;
 610
 611         usb_kill_anchored_urbs(&priv->tx_submitted);
 612         atomic_set(&priv->active_tx_urbs, 0);
 613
 614         for (i = 0; i < MAX_TX_URBS; i++)
 615                 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
 616 }
 617
 618 static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
 619                                 const struct kvaser_msg *msg)
 620 {
 621         struct can_frame *cf;
 622         struct sk_buff *skb;
 623         struct net_device_stats *stats;
 624         struct kvaser_usb_net_priv *priv;
 625         unsigned int new_state;
 626         u8 channel, status, txerr, rxerr, error_factor;
 627
 628         switch (msg->id) {
 629         case CMD_CAN_ERROR_EVENT:
 630                 channel = msg->u.error_event.channel;
 631                 status =  msg->u.error_event.status;
 632                 txerr = msg->u.error_event.tx_errors_count;
 633                 rxerr = msg->u.error_event.rx_errors_count;
 634                 error_factor = msg->u.error_event.error_factor;
 635                 break;
 636         case CMD_LOG_MESSAGE:
 637                 channel = msg->u.log_message.channel;
 638                 status = msg->u.log_message.data[0];
 639                 txerr = msg->u.log_message.data[2];
 640                 rxerr = msg->u.log_message.data[3];
 641                 error_factor = msg->u.log_message.data[1];
 642                 break;
 643         case CMD_CHIP_STATE_EVENT:
 644                 channel = msg->u.chip_state_event.channel;
 645                 status =  msg->u.chip_state_event.status;
 646                 txerr = msg->u.chip_state_event.tx_errors_count;
 647                 rxerr = msg->u.chip_state_event.rx_errors_count;
 648                 error_factor = 0;
 649                 break;
 650         default:
 651                 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
 652                         msg->id);
 653                 return;
 654         }
 655
 656         if (channel >= dev->nchannels) {
 657                 dev_err(dev->udev->dev.parent,
 658                         "Invalid channel number (%d)\n", channel);
 659                 return;
 660         }
 661
 662         priv = dev->nets[channel];
 663         stats = &priv->netdev->stats;
 664
 665         if (status & M16C_STATE_BUS_RESET) {
 666                 kvaser_usb_unlink_tx_urbs(priv);
 667                 return;
 668         }
 669
 670         skb = alloc_can_err_skb(priv->netdev, &cf);
 671         if (!skb) {
 672                 stats->rx_dropped++;
 673                 return;
 674         }
 675
 676         new_state = priv->can.state;
 677
 678         netdev_dbg(priv->netdev, "Error status: 0x%02x\n", status);
 679
 680         if (status & M16C_STATE_BUS_OFF) {
 681                 cf->can_id |= CAN_ERR_BUSOFF;
 682
 683                 priv->can.can_stats.bus_off++;
 684                 if (!priv->can.restart_ms)
 685                         kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP);
 686
 687                 netif_carrier_off(priv->netdev);
 688
 689                 new_state = CAN_STATE_BUS_OFF;
 690         } else if (status & M16C_STATE_BUS_PASSIVE) {
 691                 if (priv->can.state != CAN_STATE_ERROR_PASSIVE) {
 692                         cf->can_id |= CAN_ERR_CRTL;
 693
 694                         if (txerr || rxerr)
 695                                 cf->data[1] = (txerr > rxerr)
 696                                                 ? CAN_ERR_CRTL_TX_PASSIVE
 697                                                 : CAN_ERR_CRTL_RX_PASSIVE;
 698                         else
 699                                 cf->data[1] = CAN_ERR_CRTL_TX_PASSIVE |
 700                                               CAN_ERR_CRTL_RX_PASSIVE;
 701
 702                         priv->can.can_stats.error_passive++;
 703                 }
 704
 705                 new_state = CAN_STATE_ERROR_PASSIVE;
 706         }
 707
 708         if (status == M16C_STATE_BUS_ERROR) {
 709                 if ((priv->can.state < CAN_STATE_ERROR_WARNING) &&
 710                     ((txerr >= 96) || (rxerr >= 96))) {
 711                         cf->can_id |= CAN_ERR_CRTL;
 712                         cf->data[1] = (txerr > rxerr)
 713                                         ? CAN_ERR_CRTL_TX_WARNING
 714                                         : CAN_ERR_CRTL_RX_WARNING;
 715
 716                         priv->can.can_stats.error_warning++;
 717                         new_state = CAN_STATE_ERROR_WARNING;
 718                 } else if (priv->can.state > CAN_STATE_ERROR_ACTIVE) {
 719                         cf->can_id |= CAN_ERR_PROT;
 720                         cf->data[2] = CAN_ERR_PROT_ACTIVE;
 721
 722                         new_state = CAN_STATE_ERROR_ACTIVE;
 723                 }
 724         }
 725
 726         if (!status) {
 727                 cf->can_id |= CAN_ERR_PROT;
 728                 cf->data[2] = CAN_ERR_PROT_ACTIVE;
 729
 730                 new_state = CAN_STATE_ERROR_ACTIVE;
 731         }
 732
 733         if (priv->can.restart_ms &&
 734             (priv->can.state >= CAN_STATE_BUS_OFF) &&
 735             (new_state < CAN_STATE_BUS_OFF)) {
 736                 cf->can_id |= CAN_ERR_RESTARTED;
 737                 netif_carrier_on(priv->netdev);
 738
 739                 priv->can.can_stats.restarts++;
 740         }
 741
 742         if (error_factor) {
 743                 priv->can.can_stats.bus_error++;
 744                 stats->rx_errors++;
 745
 746                 cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
 747
 748                 if (error_factor & M16C_EF_ACKE)
 749                         cf->data[3] |= (CAN_ERR_PROT_LOC_ACK);
 750                 if (error_factor & M16C_EF_CRCE)
 751                         cf->data[3] |= (CAN_ERR_PROT_LOC_CRC_SEQ |
 752                                         CAN_ERR_PROT_LOC_CRC_DEL);
 753                 if (error_factor & M16C_EF_FORME)
 754                         cf->data[2] |= CAN_ERR_PROT_FORM;
 755                 if (error_factor & M16C_EF_STFE)
 756                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 757                 if (error_factor & M16C_EF_BITE0)
 758                         cf->data[2] |= CAN_ERR_PROT_BIT0;
 759                 if (error_factor & M16C_EF_BITE1)
 760                         cf->data[2] |= CAN_ERR_PROT_BIT1;
 761                 if (error_factor & M16C_EF_TRE)
 762                         cf->data[2] |= CAN_ERR_PROT_TX;
 763         }
 764
 765         cf->data[6] = txerr;
 766         cf->data[7] = rxerr;
 767
 768         priv->bec.txerr = txerr;
 769         priv->bec.rxerr = rxerr;
 770
 771         priv->can.state = new_state;
 772
 773         netif_rx(skb);
 774
 775         stats->rx_packets++;
 776         stats->rx_bytes += cf->can_dlc;
 777 }
 778
 779 static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
 780                                   const struct kvaser_msg *msg)
 781 {
 782         struct can_frame *cf;
 783         struct sk_buff *skb;
 784         struct net_device_stats *stats = &priv->netdev->stats;
 785
 786         if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME |
 787                                          MSG_FLAG_NERR)) {
 788                 netdev_err(priv->netdev, "Unknow error (flags: 0x%02x)\n",
 789                            msg->u.rx_can.flag);
 790
 791                 stats->rx_errors++;
 792                 return;
 793         }
 794
 795         if (msg->u.rx_can.flag & MSG_FLAG_OVERRUN) {
 796                 skb = alloc_can_err_skb(priv->netdev, &cf);
 797                 if (!skb) {
 798                         stats->rx_dropped++;
 799                         return;
 800                 }
 801
 802                 cf->can_id |= CAN_ERR_CRTL;
 803                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 804
 805                 stats->rx_over_errors++;
 806                 stats->rx_errors++;
 807
 808                 netif_rx(skb);
 809
 810                 stats->rx_packets++;
 811                 stats->rx_bytes += cf->can_dlc;
 812         }
 813 }
 814
 815 static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
 816                                   const struct kvaser_msg *msg)
 817 {
 818         struct kvaser_usb_net_priv *priv;
 819         struct can_frame *cf;
 820         struct sk_buff *skb;
 821         struct net_device_stats *stats;
 822         u8 channel = msg->u.rx_can.channel;
 823
 824         if (channel >= dev->nchannels) {
 825                 dev_err(dev->udev->dev.parent,
 826                         "Invalid channel number (%d)\n", channel);
 827                 return;
 828         }
 829
 830         priv = dev->nets[channel];
 831         stats = &priv->netdev->stats;
 832
 833         if ((msg->u.rx_can.flag & MSG_FLAG_ERROR_FRAME) &&
 834             (msg->id == CMD_LOG_MESSAGE)) {
 835                 kvaser_usb_rx_error(dev, msg);
 836                 return;
 837         } else if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME |
 838                                          MSG_FLAG_NERR |
 839                                          MSG_FLAG_OVERRUN)) {
 840                 kvaser_usb_rx_can_err(priv, msg);
 841                 return;
 842         } else if (msg->u.rx_can.flag & ~MSG_FLAG_REMOTE_FRAME) {
 843                 netdev_warn(priv->netdev,
 844                             "Unhandled frame (flags: 0x%02x)",
 845                             msg->u.rx_can.flag);
 846                 return;
 847         }
 848
 849         skb = alloc_can_skb(priv->netdev, &cf);
 850         if (!skb) {
 851                 stats->tx_dropped++;
 852                 return;
 853         }
 854
 855         if (msg->id == CMD_LOG_MESSAGE) {
 856                 cf->can_id = le32_to_cpu(msg->u.log_message.id);
 857                 if (cf->can_id & KVASER_EXTENDED_FRAME)
 858                         cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
 859                 else
 860                         cf->can_id &= CAN_SFF_MASK;
 861
 862                 cf->can_dlc = get_can_dlc(msg->u.log_message.dlc);
 863
 864                 if (msg->u.log_message.flags & MSG_FLAG_REMOTE_FRAME)
 865                         cf->can_id |= CAN_RTR_FLAG;
 866                 else
 867                         memcpy(cf->data, &msg->u.log_message.data,
 868                                cf->can_dlc);
 869         } else {
 870                 cf->can_id = ((msg->u.rx_can.msg[0] & 0x1f) << 6) |
 871                              (msg->u.rx_can.msg[1] & 0x3f);
 872
 873                 if (msg->id == CMD_RX_EXT_MESSAGE) {
 874                         cf->can_id <<= 18;
 875                         cf->can_id |= ((msg->u.rx_can.msg[2] & 0x0f) << 14) |
 876                                       ((msg->u.rx_can.msg[3] & 0xff) << 6) |
 877                                       (msg->u.rx_can.msg[4] & 0x3f);
 878                         cf->can_id |= CAN_EFF_FLAG;
 879                 }
 880
 881                 cf->can_dlc = get_can_dlc(msg->u.rx_can.msg[5]);
 882
 883                 if (msg->u.rx_can.flag & MSG_FLAG_REMOTE_FRAME)
 884                         cf->can_id |= CAN_RTR_FLAG;
 885                 else
 886                         memcpy(cf->data, &msg->u.rx_can.msg[6],
 887                                cf->can_dlc);
 888         }
 889
 890         netif_rx(skb);
 891
 892         stats->rx_packets++;
 893         stats->rx_bytes += cf->can_dlc;
 894 }
 895
 896 static void kvaser_usb_start_chip_reply(const struct kvaser_usb *dev,
 897                                         const struct kvaser_msg *msg)
 898 {
 899         struct kvaser_usb_net_priv *priv;
 900         u8 channel = msg->u.simple.channel;
 901
 902         if (channel >= dev->nchannels) {
 903                 dev_err(dev->udev->dev.parent,
 904                         "Invalid channel number (%d)\n", channel);
 905                 return;
 906         }
 907
 908         priv = dev->nets[channel];
 909
 910         if (completion_done(&priv->start_comp) &&
 911             netif_queue_stopped(priv->netdev)) {
 912                 netif_wake_queue(priv->netdev);
 913         } else {
 914                 netif_start_queue(priv->netdev);
 915                 complete(&priv->start_comp);
 916         }
 917 }
 918
 919 static void kvaser_usb_stop_chip_reply(const struct kvaser_usb *dev,
 920                                        const struct kvaser_msg *msg)
 921 {
 922         struct kvaser_usb_net_priv *priv;
 923         u8 channel = msg->u.simple.channel;
 924
 925         if (channel >= dev->nchannels) {
 926                 dev_err(dev->udev->dev.parent,
 927                         "Invalid channel number (%d)\n", channel);
 928                 return;
 929         }
 930
 931         priv = dev->nets[channel];
 932
 933         complete(&priv->stop_comp);
 934 }
 935
 936 static void kvaser_usb_handle_message(const struct kvaser_usb *dev,
 937                                       const struct kvaser_msg *msg)
 938 {
 939         switch (msg->id) {
 940         case CMD_START_CHIP_REPLY:
 941                 kvaser_usb_start_chip_reply(dev, msg);
 942                 break;
 943
 944         case CMD_STOP_CHIP_REPLY:
 945                 kvaser_usb_stop_chip_reply(dev, msg);
 946                 break;
 947
 948         case CMD_RX_STD_MESSAGE:
 949         case CMD_RX_EXT_MESSAGE:
 950         case CMD_LOG_MESSAGE:
 951                 kvaser_usb_rx_can_msg(dev, msg);
 952                 break;
 953
 954         case CMD_CHIP_STATE_EVENT:
 955         case CMD_CAN_ERROR_EVENT:
 956                 kvaser_usb_rx_error(dev, msg);
 957                 break;
 958
 959         case CMD_TX_ACKNOWLEDGE:
 960                 kvaser_usb_tx_acknowledge(dev, msg);
 961                 break;
 962
 963         default:
 964                 dev_warn(dev->udev->dev.parent,
 965                          "Unhandled message (%d)\n", msg->id);
 966                 break;
 967         }
 968 }
 969
 970 static void kvaser_usb_read_bulk_callback(struct urb *urb)
 971 {
 972         struct kvaser_usb *dev = urb->context;
 973         struct kvaser_msg *msg;
 974         int pos = 0;
 975         int err, i;
 976
 977         switch (urb->status) {
 978         case 0:
 979                 break;
 980         case -ENOENT:
 981         case -ESHUTDOWN:
 982                 return;
 983         default:
 984                 dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n",
 985                          urb->status);
 986                 goto resubmit_urb;
 987         }
 988
 989         while (pos <= urb->actual_length - MSG_HEADER_LEN) {
 990                 msg = urb->transfer_buffer + pos;
 991
 992                 if (!msg->len)
 993                         break;
 994
 995                 if (pos + msg->len > urb->actual_length) {
 996                         dev_err(dev->udev->dev.parent, "Format error\n");
 997                         break;
 998                 }
 999
1000                 kvaser_usb_handle_message(dev, msg);
1001
1002                 pos += msg->len;
1003         }
1004
1005 resubmit_urb:
1006         usb_fill_bulk_urb(urb, dev->udev,
1007                           usb_rcvbulkpipe(dev->udev,
1008                                           dev->bulk_in->bEndpointAddress),
1009                           urb->transfer_buffer, RX_BUFFER_SIZE,
1010                           kvaser_usb_read_bulk_callback, dev);
1011
1012         err = usb_submit_urb(urb, GFP_ATOMIC);
1013         if (err == -ENODEV) {
1014                 for (i = 0; i < dev->nchannels; i++) {
1015                         if (!dev->nets[i])
1016                                 continue;
1017
1018                         netif_device_detach(dev->nets[i]->netdev);
1019                 }
1020         } else if (err) {
1021                 dev_err(dev->udev->dev.parent,
1022                         "Failed resubmitting read bulk urb: %d\n", err);
1023         }
1024
1025         return;
1026 }
1027
1028 static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
1029 {
1030         int i, err = 0;
1031
1032         if (dev->rxinitdone)
1033                 return 0;
1034
1035         for (i = 0; i < MAX_RX_URBS; i++) {
1036                 struct urb *urb = NULL;
1037                 u8 *buf = NULL;
1038                 dma_addr_t buf_dma;
1039
1040                 urb = usb_alloc_urb(0, GFP_KERNEL);
1041                 if (!urb) {
1042                         dev_warn(dev->udev->dev.parent,
1043                                  "No memory left for URBs\n");
1044                         err = -ENOMEM;
1045                         break;
1046                 }
1047
1048                 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE,
1049                                          GFP_KERNEL, &buf_dma);
1050                 if (!buf) {
1051                         dev_warn(dev->udev->dev.parent,
1052                                  "No memory left for USB buffer\n");
1053                         usb_free_urb(urb);
1054                         err = -ENOMEM;
1055                         break;
1056                 }
1057
1058                 usb_fill_bulk_urb(urb, dev->udev,
1059                                   usb_rcvbulkpipe(dev->udev,
1060                                           dev->bulk_in->bEndpointAddress),
1061                                   buf, RX_BUFFER_SIZE,
1062                                   kvaser_usb_read_bulk_callback,
1063                                   dev);
1064                 urb->transfer_dma = buf_dma;
1065                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1066                 usb_anchor_urb(urb, &dev->rx_submitted);
1067
1068                 err = usb_submit_urb(urb, GFP_KERNEL);
1069                 if (err) {
1070                         usb_unanchor_urb(urb);
1071                         usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
1072                                           buf_dma);
1073                         usb_free_urb(urb);
1074                         break;
1075                 }
1076
1077                 dev->rxbuf[i] = buf;
1078                 dev->rxbuf_dma[i] = buf_dma;
1079
1080                 usb_free_urb(urb);
1081         }
1082
1083         if (i == 0) {
1084                 dev_warn(dev->udev->dev.parent,
1085                          "Cannot setup read URBs, error %d\n", err);
1086                 return err;
1087         } else if (i < MAX_RX_URBS) {
1088                 dev_warn(dev->udev->dev.parent,
1089                          "RX performances may be slow\n");
1090         }
1091
1092         dev->rxinitdone = true;
1093
1094         return 0;
1095 }
1096
1097 static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1098 {
1099         struct kvaser_msg *msg;
1100         int rc;
1101
1102         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1103         if (!msg)
1104                 return -ENOMEM;
1105
1106         msg->id = CMD_SET_CTRL_MODE;
1107         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_ctrl_mode);
1108         msg->u.ctrl_mode.tid = 0xff;
1109         msg->u.ctrl_mode.channel = priv->channel;
1110
1111         if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1112                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1113         else
1114                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1115
1116         rc = kvaser_usb_send_msg(priv->dev, msg);
1117
1118         kfree(msg);
1119         return rc;
1120 }
1121
1122 static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv)
1123 {
1124         int err;
1125
1126         init_completion(&priv->start_comp);
1127
1128         err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP,
1129                                          priv->channel);
1130         if (err)
1131                 return err;
1132
1133         if (!wait_for_completion_timeout(&priv->start_comp,
1134                                          msecs_to_jiffies(START_TIMEOUT)))
1135                 return -ETIMEDOUT;
1136
1137         return 0;
1138 }
1139
1140 static int kvaser_usb_open(struct net_device *netdev)
1141 {
1142         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1143         struct kvaser_usb *dev = priv->dev;
1144         int err;
1145
1146         err = open_candev(netdev);
1147         if (err)
1148                 return err;
1149
1150         err = kvaser_usb_setup_rx_urbs(dev);
1151         if (err)
1152                 goto error;
1153
1154         err = kvaser_usb_set_opt_mode(priv);
1155         if (err)
1156                 goto error;
1157
1158         err = kvaser_usb_start_chip(priv);
1159         if (err) {
1160                 netdev_warn(netdev, "Cannot start device, error %d\n", err);
1161                 goto error;
1162         }
1163
1164         priv->can.state = CAN_STATE_ERROR_ACTIVE;
1165
1166         return 0;
1167
1168 error:
1169         close_candev(netdev);
1170         return err;
1171 }
1172
1173 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
1174 {
1175         int i;
1176
1177         usb_kill_anchored_urbs(&dev->rx_submitted);
1178
1179         for (i = 0; i < MAX_RX_URBS; i++)
1180                 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
1181                                   dev->rxbuf[i],
1182                                   dev->rxbuf_dma[i]);
1183
1184         for (i = 0; i < MAX_NET_DEVICES; i++) {
1185                 struct kvaser_usb_net_priv *priv = dev->nets[i];
1186
1187                 if (priv)
1188                         kvaser_usb_unlink_tx_urbs(priv);
1189         }
1190 }
1191
1192 static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv)
1193 {
1194         int err;
1195
1196         init_completion(&priv->stop_comp);
1197
1198         err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP,
1199                                          priv->channel);
1200         if (err)
1201                 return err;
1202
1203         if (!wait_for_completion_timeout(&priv->stop_comp,
1204                                          msecs_to_jiffies(STOP_TIMEOUT)))
1205                 return -ETIMEDOUT;
1206
1207         return 0;
1208 }
1209
1210 static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv)
1211 {
1212         struct kvaser_msg *msg;
1213         int rc;
1214
1215         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1216         if (!msg)
1217                 return -ENOMEM;
1218
1219         msg->id = CMD_FLUSH_QUEUE;
1220         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_flush_queue);
1221         msg->u.flush_queue.channel = priv->channel;
1222         msg->u.flush_queue.flags = 0x00;
1223
1224         rc = kvaser_usb_send_msg(priv->dev, msg);
1225
1226         kfree(msg);
1227         return rc;
1228 }
1229
1230 static int kvaser_usb_close(struct net_device *netdev)
1231 {
1232         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1233         struct kvaser_usb *dev = priv->dev;
1234         int err;
1235
1236         netif_stop_queue(netdev);
1237
1238         err = kvaser_usb_flush_queue(priv);
1239         if (err)
1240                 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
1241
1242         if (kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel))
1243                 netdev_warn(netdev, "Cannot reset card, error %d\n", err);
1244
1245         err = kvaser_usb_stop_chip(priv);
1246         if (err)
1247                 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
1248
1249         priv->can.state = CAN_STATE_STOPPED;
1250         close_candev(priv->netdev);
1251
1252         return 0;
1253 }
1254
1255 static void kvaser_usb_write_bulk_callback(struct urb *urb)
1256 {
1257         struct kvaser_usb_tx_urb_context *context = urb->context;
1258         struct kvaser_usb_net_priv *priv;
1259         struct net_device *netdev;
1260
1261         if (WARN_ON(!context))
1262                 return;
1263
1264         priv = context->priv;
1265         netdev = priv->netdev;
1266
1267         kfree(urb->transfer_buffer);
1268
1269         if (!netif_device_present(netdev))
1270                 return;
1271
1272         if (urb->status)
1273                 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1274 }
1275
1276 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1277                                          struct net_device *netdev)
1278 {
1279         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1280         struct kvaser_usb *dev = priv->dev;
1281         struct net_device_stats *stats = &netdev->stats;
1282         struct can_frame *cf = (struct can_frame *)skb->data;
1283         struct kvaser_usb_tx_urb_context *context = NULL;
1284         struct urb *urb;
1285         void *buf;
1286         struct kvaser_msg *msg;
1287         int i, err;
1288         int ret = NETDEV_TX_OK;
1289
1290         if (can_dropped_invalid_skb(netdev, skb))
1291                 return NETDEV_TX_OK;
1292
1293         urb = usb_alloc_urb(0, GFP_ATOMIC);
1294         if (!urb) {
1295                 netdev_err(netdev, "No memory left for URBs\n");
1296                 stats->tx_dropped++;
1297                 goto nourbmem;
1298         }
1299
1300         buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1301         if (!buf) {
1302                 stats->tx_dropped++;
1303                 goto nobufmem;
1304         }
1305
1306         msg = buf;
1307         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
1308         msg->u.tx_can.flags = 0;
1309         msg->u.tx_can.channel = priv->channel;
1310
1311         if (cf->can_id & CAN_EFF_FLAG) {
1312                 msg->id = CMD_TX_EXT_MESSAGE;
1313                 msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
1314                 msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
1315                 msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
1316                 msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
1317                 msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
1318         } else {
1319                 msg->id = CMD_TX_STD_MESSAGE;
1320                 msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
1321                 msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
1322         }
1323
1324         msg->u.tx_can.msg[5] = cf->can_dlc;
1325         memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
1326
1327         if (cf->can_id & CAN_RTR_FLAG)
1328                 msg->u.tx_can.flags |= MSG_FLAG_REMOTE_FRAME;
1329
1330         for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++) {
1331                 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
1332                         context = &priv->tx_contexts[i];
1333                         break;
1334                 }
1335         }
1336
1337         if (!context) {
1338                 netdev_warn(netdev, "cannot find free context\n");
1339                 ret =  NETDEV_TX_BUSY;
1340                 goto releasebuf;
1341         }
1342
1343         context->priv = priv;
1344         context->echo_index = i;
1345         context->dlc = cf->can_dlc;
1346
1347         msg->u.tx_can.tid = context->echo_index;
1348
1349         usb_fill_bulk_urb(urb, dev->udev,
1350                           usb_sndbulkpipe(dev->udev,
1351                                           dev->bulk_out->bEndpointAddress),
1352                           buf, msg->len,
1353                           kvaser_usb_write_bulk_callback, context);
1354         usb_anchor_urb(urb, &priv->tx_submitted);
1355
1356         can_put_echo_skb(skb, netdev, context->echo_index);
1357
1358         atomic_inc(&priv->active_tx_urbs);
1359
1360         if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS)
1361                 netif_stop_queue(netdev);
1362
1363         err = usb_submit_urb(urb, GFP_ATOMIC);
1364         if (unlikely(err)) {
1365                 can_free_echo_skb(netdev, context->echo_index);
1366
1367                 skb = NULL; /* set to NULL to avoid double free in
1368                              * dev_kfree_skb(skb) */
1369
1370                 atomic_dec(&priv->active_tx_urbs);
1371                 usb_unanchor_urb(urb);
1372
1373                 stats->tx_dropped++;
1374
1375                 if (err == -ENODEV)
1376                         netif_device_detach(netdev);
1377                 else
1378                         netdev_warn(netdev, "Failed tx_urb %d\n", err);
1379
1380                 goto releasebuf;
1381         }
1382
1383         usb_free_urb(urb);
1384
1385         return NETDEV_TX_OK;
1386
1387 releasebuf:
1388         kfree(buf);
1389 nobufmem:
1390         usb_free_urb(urb);
1391 nourbmem:
1392         dev_kfree_skb(skb);
1393         return ret;
1394 }
1395
1396 static const struct net_device_ops kvaser_usb_netdev_ops = {
1397         .ndo_open = kvaser_usb_open,
1398         .ndo_stop = kvaser_usb_close,
1399         .ndo_start_xmit = kvaser_usb_start_xmit,
1400         .ndo_change_mtu = can_change_mtu,
1401 };
1402
1403 static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1404         .name = "kvaser_usb",
1405         .tseg1_min = KVASER_USB_TSEG1_MIN,
1406         .tseg1_max = KVASER_USB_TSEG1_MAX,
1407         .tseg2_min = KVASER_USB_TSEG2_MIN,
1408         .tseg2_max = KVASER_USB_TSEG2_MAX,
1409         .sjw_max = KVASER_USB_SJW_MAX,
1410         .brp_min = KVASER_USB_BRP_MIN,
1411         .brp_max = KVASER_USB_BRP_MAX,
1412         .brp_inc = KVASER_USB_BRP_INC,
1413 };
1414
1415 static int kvaser_usb_set_bittiming(struct net_device *netdev)
1416 {
1417         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1418         struct can_bittiming *bt = &priv->can.bittiming;
1419         struct kvaser_usb *dev = priv->dev;
1420         struct kvaser_msg *msg;
1421         int rc;
1422
1423         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1424         if (!msg)
1425                 return -ENOMEM;
1426
1427         msg->id = CMD_SET_BUS_PARAMS;
1428         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1429         msg->u.busparams.channel = priv->channel;
1430         msg->u.busparams.tid = 0xff;
1431         msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1432         msg->u.busparams.sjw = bt->sjw;
1433         msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1434         msg->u.busparams.tseg2 = bt->phase_seg2;
1435
1436         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1437                 msg->u.busparams.no_samp = 3;
1438         else
1439                 msg->u.busparams.no_samp = 1;
1440
1441         rc = kvaser_usb_send_msg(dev, msg);
1442
1443         kfree(msg);
1444         return rc;
1445 }
1446
1447 static int kvaser_usb_set_mode(struct net_device *netdev,
1448                                enum can_mode mode)
1449 {
1450         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1451         int err;
1452
1453         switch (mode) {
1454         case CAN_MODE_START:
1455                 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1456                 if (err)
1457                         return err;
1458                 break;
1459         default:
1460                 return -EOPNOTSUPP;
1461         }
1462
1463         return 0;
1464 }
1465
1466 static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1467                                        struct can_berr_counter *bec)
1468 {
1469         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1470
1471         *bec = priv->bec;
1472
1473         return 0;
1474 }
1475
1476 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1477 {
1478         int i;
1479
1480         for (i = 0; i < dev->nchannels; i++) {
1481                 if (!dev->nets[i])
1482                         continue;
1483
1484                 unregister_netdev(dev->nets[i]->netdev);
1485         }
1486
1487         kvaser_usb_unlink_all_urbs(dev);
1488
1489         for (i = 0; i < dev->nchannels; i++) {
1490                 if (!dev->nets[i])
1491                         continue;
1492
1493                 free_candev(dev->nets[i]->netdev);
1494         }
1495 }
1496
1497 static int kvaser_usb_init_one(struct usb_interface *intf,
1498                                const struct usb_device_id *id, int channel)
1499 {
1500         struct kvaser_usb *dev = usb_get_intfdata(intf);
1501         struct net_device *netdev;
1502         struct kvaser_usb_net_priv *priv;
1503         int i, err;
1504
1505         netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
1506         if (!netdev) {
1507                 dev_err(&intf->dev, "Cannot alloc candev\n");
1508                 return -ENOMEM;
1509         }
1510
1511         priv = netdev_priv(netdev);
1512
1513         init_completion(&priv->start_comp);
1514         init_completion(&priv->stop_comp);
1515
1516         init_usb_anchor(&priv->tx_submitted);
1517         atomic_set(&priv->active_tx_urbs, 0);
1518
1519         for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++)
1520                 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
1521
1522         priv->dev = dev;
1523         priv->netdev = netdev;
1524         priv->channel = channel;
1525
1526         priv->can.state = CAN_STATE_STOPPED;
1527         priv->can.clock.freq = CAN_USB_CLOCK;
1528         priv->can.bittiming_const = &kvaser_usb_bittiming_const;
1529         priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
1530         priv->can.do_set_mode = kvaser_usb_set_mode;
1531         if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
1532                 priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
1533         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
1534         if (id->driver_info & KVASER_HAS_SILENT_MODE)
1535                 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1536
1537         netdev->flags |= IFF_ECHO;
1538
1539         netdev->netdev_ops = &kvaser_usb_netdev_ops;
1540
1541         SET_NETDEV_DEV(netdev, &intf->dev);
1542         netdev->dev_id = channel;
1543
1544         dev->nets[channel] = priv;
1545
1546         err = register_candev(netdev);
1547         if (err) {
1548                 dev_err(&intf->dev, "Failed to register can device\n");
1549                 free_candev(netdev);
1550                 dev->nets[channel] = NULL;
1551                 return err;
1552         }
1553
1554         netdev_dbg(netdev, "device registered\n");
1555
1556         return 0;
1557 }
1558
1559 static int kvaser_usb_get_endpoints(const struct usb_interface *intf,
1560                                     struct usb_endpoint_descriptor **in,
1561                                     struct usb_endpoint_descriptor **out)
1562 {
1563         const struct usb_host_interface *iface_desc;
1564         struct usb_endpoint_descriptor *endpoint;
1565         int i;
1566
1567         iface_desc = &intf->altsetting[0];
1568
1569         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1570                 endpoint = &iface_desc->endpoint[i].desc;
1571
1572                 if (!*in && usb_endpoint_is_bulk_in(endpoint))
1573                         *in = endpoint;
1574
1575                 if (!*out && usb_endpoint_is_bulk_out(endpoint))
1576                         *out = endpoint;
1577
1578                 /* use first bulk endpoint for in and out */
1579                 if (*in && *out)
1580                         return 0;
1581         }
1582
1583         return -ENODEV;
1584 }
1585
1586 static int kvaser_usb_probe(struct usb_interface *intf,
1587                             const struct usb_device_id *id)
1588 {
1589         struct kvaser_usb *dev;
1590         int err = -ENOMEM;
1591         int i;
1592
1593         dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
1594         if (!dev)
1595                 return -ENOMEM;
1596
1597         err = kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
1598         if (err) {
1599                 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
1600                 return err;
1601         }
1602
1603         dev->udev = interface_to_usbdev(intf);
1604
1605         init_usb_anchor(&dev->rx_submitted);
1606
1607         usb_set_intfdata(intf, dev);
1608
1609         for (i = 0; i < MAX_NET_DEVICES; i++)
1610                 kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, i);
1611
1612         err = kvaser_usb_get_software_info(dev);
1613         if (err) {
1614                 dev_err(&intf->dev,
1615                         "Cannot get software infos, error %d\n", err);
1616                 return err;
1617         }
1618
1619         err = kvaser_usb_get_card_info(dev);
1620         if (err) {
1621                 dev_err(&intf->dev,
1622                         "Cannot get card infos, error %d\n", err);
1623                 return err;
1624         }
1625
1626         dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
1627                 ((dev->fw_version >> 24) & 0xff),
1628                 ((dev->fw_version >> 16) & 0xff),
1629                 (dev->fw_version & 0xffff));
1630
1631         for (i = 0; i < dev->nchannels; i++) {
1632                 err = kvaser_usb_init_one(intf, id, i);
1633                 if (err) {
1634                         kvaser_usb_remove_interfaces(dev);
1635                         return err;
1636                 }
1637         }
1638
1639         return 0;
1640 }
1641
1642 static void kvaser_usb_disconnect(struct usb_interface *intf)
1643 {
1644         struct kvaser_usb *dev = usb_get_intfdata(intf);
1645
1646         usb_set_intfdata(intf, NULL);
1647
1648         if (!dev)
1649                 return;
1650
1651         kvaser_usb_remove_interfaces(dev);
1652 }
1653
1654 static struct usb_driver kvaser_usb_driver = {
1655         .name = "kvaser_usb",
1656         .probe = kvaser_usb_probe,
1657         .disconnect = kvaser_usb_disconnect,
1658         .id_table = kvaser_usb_table,
1659 };
1660
1661 module_usb_driver(kvaser_usb_driver);
1662
1663 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
1664 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
1665 MODULE_LICENSE("GPL v2");