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  *  - Kvaser linux usbcanII driver (version 5.3)
  10  *
  11  * Copyright (C) 2002-2006 KVASER AB, Sweden. All rights reserved.
  12  * Copyright (C) 2010 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh
  13  * Copyright (C) 2012 Olivier Sobrie <olivier@sobrie.be>
  14  * Copyright (C) 2015 Valeo S.A.
  15  */
  16
  17 #include <linux/spinlock.h>
  18 #include <linux/kernel.h>
  19 #include <linux/completion.h>
  20 #include <linux/module.h>
  21 #include <linux/netdevice.h>
  22 #include <linux/usb.h>
  23
  24 #include <linux/can.h>
  25 #include <linux/can/dev.h>
  26 #include <linux/can/error.h>
  27
  28 #define MAX_TX_URBS                     16
  29 #define MAX_RX_URBS                     4
  30 #define START_TIMEOUT                   1000 /* msecs */
  31 #define STOP_TIMEOUT                    1000 /* msecs */
  32 #define USB_SEND_TIMEOUT                1000 /* msecs */
  33 #define USB_RECV_TIMEOUT                1000 /* msecs */
  34 #define RX_BUFFER_SIZE                  3072
  35 #define CAN_USB_CLOCK                   8000000
  36 #define MAX_NET_DEVICES                 3
  37 #define MAX_USBCAN_NET_DEVICES          2
  38
  39 /* Kvaser Leaf USB devices */
  40 #define KVASER_VENDOR_ID                0x0bfd
  41 #define USB_LEAF_DEVEL_PRODUCT_ID       10
  42 #define USB_LEAF_LITE_PRODUCT_ID        11
  43 #define USB_LEAF_PRO_PRODUCT_ID         12
  44 #define USB_LEAF_SPRO_PRODUCT_ID        14
  45 #define USB_LEAF_PRO_LS_PRODUCT_ID      15
  46 #define USB_LEAF_PRO_SWC_PRODUCT_ID     16
  47 #define USB_LEAF_PRO_LIN_PRODUCT_ID     17
  48 #define USB_LEAF_SPRO_LS_PRODUCT_ID     18
  49 #define USB_LEAF_SPRO_SWC_PRODUCT_ID    19
  50 #define USB_MEMO2_DEVEL_PRODUCT_ID      22
  51 #define USB_MEMO2_HSHS_PRODUCT_ID       23
  52 #define USB_UPRO_HSHS_PRODUCT_ID        24
  53 #define USB_LEAF_LITE_GI_PRODUCT_ID     25
  54 #define USB_LEAF_PRO_OBDII_PRODUCT_ID   26
  55 #define USB_MEMO2_HSLS_PRODUCT_ID       27
  56 #define USB_LEAF_LITE_CH_PRODUCT_ID     28
  57 #define USB_BLACKBIRD_SPRO_PRODUCT_ID   29
  58 #define USB_OEM_MERCURY_PRODUCT_ID      34
  59 #define USB_OEM_LEAF_PRODUCT_ID         35
  60 #define USB_CAN_R_PRODUCT_ID            39
  61 #define USB_LEAF_LITE_V2_PRODUCT_ID     288
  62 #define USB_MINI_PCIE_HS_PRODUCT_ID     289
  63
  64 static inline bool kvaser_is_leaf(const struct usb_device_id *id)
  65 {
  66         return id->idProduct >= USB_LEAF_DEVEL_PRODUCT_ID &&
  67                id->idProduct <= USB_MINI_PCIE_HS_PRODUCT_ID;
  68 }
  69
  70 /* Kvaser USBCan-II devices */
  71 #define USB_USBCAN_REVB_PRODUCT_ID      2
  72 #define USB_VCI2_PRODUCT_ID             3
  73 #define USB_USBCAN2_PRODUCT_ID          4
  74 #define USB_MEMORATOR_PRODUCT_ID        5
  75
  76 static inline bool kvaser_is_usbcan(const struct usb_device_id *id)
  77 {
  78         return id->idProduct >= USB_USBCAN_REVB_PRODUCT_ID &&
  79                id->idProduct <= USB_MEMORATOR_PRODUCT_ID;
  80 }
  81
  82 /* USB devices features */
  83 #define KVASER_HAS_SILENT_MODE          BIT(0)
  84 #define KVASER_HAS_TXRX_ERRORS          BIT(1)
  85
  86 /* Message header size */
  87 #define MSG_HEADER_LEN                  2
  88
  89 /* Can message flags */
  90 #define MSG_FLAG_ERROR_FRAME            BIT(0)
  91 #define MSG_FLAG_OVERRUN                BIT(1)
  92 #define MSG_FLAG_NERR                   BIT(2)
  93 #define MSG_FLAG_WAKEUP                 BIT(3)
  94 #define MSG_FLAG_REMOTE_FRAME           BIT(4)
  95 #define MSG_FLAG_RESERVED               BIT(5)
  96 #define MSG_FLAG_TX_ACK                 BIT(6)
  97 #define MSG_FLAG_TX_REQUEST             BIT(7)
  98
  99 /* Can states (M16C CxSTRH register) */
 100 #define M16C_STATE_BUS_RESET            BIT(0)
 101 #define M16C_STATE_BUS_ERROR            BIT(4)
 102 #define M16C_STATE_BUS_PASSIVE          BIT(5)
 103 #define M16C_STATE_BUS_OFF              BIT(6)
 104
 105 /* Can msg ids */
 106 #define CMD_RX_STD_MESSAGE              12
 107 #define CMD_TX_STD_MESSAGE              13
 108 #define CMD_RX_EXT_MESSAGE              14
 109 #define CMD_TX_EXT_MESSAGE              15
 110 #define CMD_SET_BUS_PARAMS              16
 111 #define CMD_GET_BUS_PARAMS              17
 112 #define CMD_GET_BUS_PARAMS_REPLY        18
 113 #define CMD_GET_CHIP_STATE              19
 114 #define CMD_CHIP_STATE_EVENT            20
 115 #define CMD_SET_CTRL_MODE               21
 116 #define CMD_GET_CTRL_MODE               22
 117 #define CMD_GET_CTRL_MODE_REPLY         23
 118 #define CMD_RESET_CHIP                  24
 119 #define CMD_RESET_CARD                  25
 120 #define CMD_START_CHIP                  26
 121 #define CMD_START_CHIP_REPLY            27
 122 #define CMD_STOP_CHIP                   28
 123 #define CMD_STOP_CHIP_REPLY             29
 124
 125 #define CMD_LEAF_GET_CARD_INFO2         32
 126 #define CMD_USBCAN_RESET_CLOCK          32
 127 #define CMD_USBCAN_CLOCK_OVERFLOW_EVENT 33
 128
 129 #define CMD_GET_CARD_INFO               34
 130 #define CMD_GET_CARD_INFO_REPLY         35
 131 #define CMD_GET_SOFTWARE_INFO           38
 132 #define CMD_GET_SOFTWARE_INFO_REPLY     39
 133 #define CMD_ERROR_EVENT                 45
 134 #define CMD_FLUSH_QUEUE                 48
 135 #define CMD_RESET_ERROR_COUNTER         49
 136 #define CMD_TX_ACKNOWLEDGE              50
 137 #define CMD_CAN_ERROR_EVENT             51
 138
 139 #define CMD_LEAF_USB_THROTTLE           77
 140 #define CMD_LEAF_LOG_MESSAGE            106
 141
 142 /* error factors */
 143 #define M16C_EF_ACKE                    BIT(0)
 144 #define M16C_EF_CRCE                    BIT(1)
 145 #define M16C_EF_FORME                   BIT(2)
 146 #define M16C_EF_STFE                    BIT(3)
 147 #define M16C_EF_BITE0                   BIT(4)
 148 #define M16C_EF_BITE1                   BIT(5)
 149 #define M16C_EF_RCVE                    BIT(6)
 150 #define M16C_EF_TRE                     BIT(7)
 151
 152 /* Only Leaf-based devices can report M16C error factors,
 153  * thus define our own error status flags for USBCANII
 154  */
 155 #define USBCAN_ERROR_STATE_NONE         0
 156 #define USBCAN_ERROR_STATE_TX_ERROR     BIT(0)
 157 #define USBCAN_ERROR_STATE_RX_ERROR     BIT(1)
 158 #define USBCAN_ERROR_STATE_BUSERROR     BIT(2)
 159
 160 /* bittiming parameters */
 161 #define KVASER_USB_TSEG1_MIN            1
 162 #define KVASER_USB_TSEG1_MAX            16
 163 #define KVASER_USB_TSEG2_MIN            1
 164 #define KVASER_USB_TSEG2_MAX            8
 165 #define KVASER_USB_SJW_MAX              4
 166 #define KVASER_USB_BRP_MIN              1
 167 #define KVASER_USB_BRP_MAX              64
 168 #define KVASER_USB_BRP_INC              1
 169
 170 /* ctrl modes */
 171 #define KVASER_CTRL_MODE_NORMAL         1
 172 #define KVASER_CTRL_MODE_SILENT         2
 173 #define KVASER_CTRL_MODE_SELFRECEPTION  3
 174 #define KVASER_CTRL_MODE_OFF            4
 175
 176 /* Extended CAN identifier flag */
 177 #define KVASER_EXTENDED_FRAME           BIT(31)
 178
 179 /* Kvaser USB CAN dongles are divided into two major families:
 180  * - Leaf: Based on Renesas M32C, running firmware labeled as 'filo'
 181  * - UsbcanII: Based on Renesas M16C, running firmware labeled as 'helios'
 182  */
 183 enum kvaser_usb_family {
 184         KVASER_LEAF,
 185         KVASER_USBCAN,
 186 };
 187
 188 struct kvaser_msg_simple {
 189         u8 tid;
 190         u8 channel;
 191 } __packed;
 192
 193 struct kvaser_msg_cardinfo {
 194         u8 tid;
 195         u8 nchannels;
 196         union {
 197                 struct {
 198                         __le32 serial_number;
 199                         __le32 padding;
 200                 } __packed leaf0;
 201                 struct {
 202                         __le32 serial_number_low;
 203                         __le32 serial_number_high;
 204                 } __packed usbcan0;
 205         } __packed;
 206         __le32 clock_resolution;
 207         __le32 mfgdate;
 208         u8 ean[8];
 209         u8 hw_revision;
 210         union {
 211                 struct {
 212                         u8 usb_hs_mode;
 213                 } __packed leaf1;
 214                 struct {
 215                         u8 padding;
 216                 } __packed usbcan1;
 217         } __packed;
 218         __le16 padding;
 219 } __packed;
 220
 221 struct kvaser_msg_cardinfo2 {
 222         u8 tid;
 223         u8 reserved;
 224         u8 pcb_id[24];
 225         __le32 oem_unlock_code;
 226 } __packed;
 227
 228 struct leaf_msg_softinfo {
 229         u8 tid;
 230         u8 padding0;
 231         __le32 sw_options;
 232         __le32 fw_version;
 233         __le16 max_outstanding_tx;
 234         __le16 padding1[9];
 235 } __packed;
 236
 237 struct usbcan_msg_softinfo {
 238         u8 tid;
 239         u8 fw_name[5];
 240         __le16 max_outstanding_tx;
 241         u8 padding[6];
 242         __le32 fw_version;
 243         __le16 checksum;
 244         __le16 sw_options;
 245 } __packed;
 246
 247 struct kvaser_msg_busparams {
 248         u8 tid;
 249         u8 channel;
 250         __le32 bitrate;
 251         u8 tseg1;
 252         u8 tseg2;
 253         u8 sjw;
 254         u8 no_samp;
 255 } __packed;
 256
 257 struct kvaser_msg_tx_can {
 258         u8 channel;
 259         u8 tid;
 260         u8 msg[14];
 261         union {
 262                 struct {
 263                         u8 padding;
 264                         u8 flags;
 265                 } __packed leaf;
 266                 struct {
 267                         u8 flags;
 268                         u8 padding;
 269                 } __packed usbcan;
 270         } __packed;
 271 } __packed;
 272
 273 struct kvaser_msg_rx_can_header {
 274         u8 channel;
 275         u8 flag;
 276 } __packed;
 277
 278 struct leaf_msg_rx_can {
 279         u8 channel;
 280         u8 flag;
 281
 282         __le16 time[3];
 283         u8 msg[14];
 284 } __packed;
 285
 286 struct usbcan_msg_rx_can {
 287         u8 channel;
 288         u8 flag;
 289
 290         u8 msg[14];
 291         __le16 time;
 292 } __packed;
 293
 294 struct leaf_msg_chip_state_event {
 295         u8 tid;
 296         u8 channel;
 297
 298         __le16 time[3];
 299         u8 tx_errors_count;
 300         u8 rx_errors_count;
 301
 302         u8 status;
 303         u8 padding[3];
 304 } __packed;
 305
 306 struct usbcan_msg_chip_state_event {
 307         u8 tid;
 308         u8 channel;
 309
 310         u8 tx_errors_count;
 311         u8 rx_errors_count;
 312         __le16 time;
 313
 314         u8 status;
 315         u8 padding[3];
 316 } __packed;
 317
 318 struct kvaser_msg_tx_acknowledge_header {
 319         u8 channel;
 320         u8 tid;
 321 } __packed;
 322
 323 struct leaf_msg_tx_acknowledge {
 324         u8 channel;
 325         u8 tid;
 326
 327         __le16 time[3];
 328         u8 flags;
 329         u8 time_offset;
 330 } __packed;
 331
 332 struct usbcan_msg_tx_acknowledge {
 333         u8 channel;
 334         u8 tid;
 335
 336         __le16 time;
 337         __le16 padding;
 338 } __packed;
 339
 340 struct leaf_msg_error_event {
 341         u8 tid;
 342         u8 flags;
 343         __le16 time[3];
 344         u8 channel;
 345         u8 padding;
 346         u8 tx_errors_count;
 347         u8 rx_errors_count;
 348         u8 status;
 349         u8 error_factor;
 350 } __packed;
 351
 352 struct usbcan_msg_error_event {
 353         u8 tid;
 354         u8 padding;
 355         u8 tx_errors_count_ch0;
 356         u8 rx_errors_count_ch0;
 357         u8 tx_errors_count_ch1;
 358         u8 rx_errors_count_ch1;
 359         u8 status_ch0;
 360         u8 status_ch1;
 361         __le16 time;
 362 } __packed;
 363
 364 struct kvaser_msg_ctrl_mode {
 365         u8 tid;
 366         u8 channel;
 367         u8 ctrl_mode;
 368         u8 padding[3];
 369 } __packed;
 370
 371 struct kvaser_msg_flush_queue {
 372         u8 tid;
 373         u8 channel;
 374         u8 flags;
 375         u8 padding[3];
 376 } __packed;
 377
 378 struct leaf_msg_log_message {
 379         u8 channel;
 380         u8 flags;
 381         __le16 time[3];
 382         u8 dlc;
 383         u8 time_offset;
 384         __le32 id;
 385         u8 data[8];
 386 } __packed;
 387
 388 struct kvaser_msg {
 389         u8 len;
 390         u8 id;
 391         union   {
 392                 struct kvaser_msg_simple simple;
 393                 struct kvaser_msg_cardinfo cardinfo;
 394                 struct kvaser_msg_cardinfo2 cardinfo2;
 395                 struct kvaser_msg_busparams busparams;
 396
 397                 struct kvaser_msg_rx_can_header rx_can_header;
 398                 struct kvaser_msg_tx_acknowledge_header tx_acknowledge_header;
 399
 400                 union {
 401                         struct leaf_msg_softinfo softinfo;
 402                         struct leaf_msg_rx_can rx_can;
 403                         struct leaf_msg_chip_state_event chip_state_event;
 404                         struct leaf_msg_tx_acknowledge tx_acknowledge;
 405                         struct leaf_msg_error_event error_event;
 406                         struct leaf_msg_log_message log_message;
 407                 } __packed leaf;
 408
 409                 union {
 410                         struct usbcan_msg_softinfo softinfo;
 411                         struct usbcan_msg_rx_can rx_can;
 412                         struct usbcan_msg_chip_state_event chip_state_event;
 413                         struct usbcan_msg_tx_acknowledge tx_acknowledge;
 414                         struct usbcan_msg_error_event error_event;
 415                 } __packed usbcan;
 416
 417                 struct kvaser_msg_tx_can tx_can;
 418                 struct kvaser_msg_ctrl_mode ctrl_mode;
 419                 struct kvaser_msg_flush_queue flush_queue;
 420         } u;
 421 } __packed;
 422
 423 /* Summary of a kvaser error event, for a unified Leaf/Usbcan error
 424  * handling. Some discrepancies between the two families exist:
 425  *
 426  * - USBCAN firmware does not report M16C "error factors"
 427  * - USBCAN controllers has difficulties reporting if the raised error
 428  *   event is for ch0 or ch1. They leave such arbitration to the OS
 429  *   driver by letting it compare error counters with previous values
 430  *   and decide the error event's channel. Thus for USBCAN, the channel
 431  *   field is only advisory.
 432  */
 433 struct kvaser_usb_error_summary {
 434         u8 channel, status, txerr, rxerr;
 435         union {
 436                 struct {
 437                         u8 error_factor;
 438                 } leaf;
 439                 struct {
 440                         u8 other_ch_status;
 441                         u8 error_state;
 442                 } usbcan;
 443         };
 444 };
 445
 446 struct kvaser_usb_tx_urb_context {
 447         struct kvaser_usb_net_priv *priv;
 448         u32 echo_index;
 449         int dlc;
 450 };
 451
 452 struct kvaser_usb {
 453         struct usb_device *udev;
 454         struct kvaser_usb_net_priv *nets[MAX_NET_DEVICES];
 455
 456         struct usb_endpoint_descriptor *bulk_in, *bulk_out;
 457         struct usb_anchor rx_submitted;
 458
 459         u32 fw_version;
 460         unsigned int nchannels;
 461         enum kvaser_usb_family family;
 462
 463         bool rxinitdone;
 464         void *rxbuf[MAX_RX_URBS];
 465         dma_addr_t rxbuf_dma[MAX_RX_URBS];
 466 };
 467
 468 struct kvaser_usb_net_priv {
 469         struct can_priv can;
 470
 471         spinlock_t tx_contexts_lock;
 472         int active_tx_contexts;
 473         struct kvaser_usb_tx_urb_context tx_contexts[MAX_TX_URBS];
 474
 475         struct usb_anchor tx_submitted;
 476         struct completion start_comp, stop_comp;
 477
 478         struct kvaser_usb *dev;
 479         struct net_device *netdev;
 480         int channel;
 481
 482         struct can_berr_counter bec;
 483 };
 484
 485 static const struct usb_device_id kvaser_usb_table[] = {
 486         /* Leaf family IDs */
 487         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
 488         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
 489         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
 490                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 491                                KVASER_HAS_SILENT_MODE },
 492         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
 493                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 494                                KVASER_HAS_SILENT_MODE },
 495         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
 496                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 497                                KVASER_HAS_SILENT_MODE },
 498         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
 499                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 500                                KVASER_HAS_SILENT_MODE },
 501         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
 502                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 503                                KVASER_HAS_SILENT_MODE },
 504         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
 505                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 506                                KVASER_HAS_SILENT_MODE },
 507         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
 508                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 509                                KVASER_HAS_SILENT_MODE },
 510         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
 511                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 512                                KVASER_HAS_SILENT_MODE },
 513         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
 514                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 515                                KVASER_HAS_SILENT_MODE },
 516         { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
 517                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 518         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
 519         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
 520                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 521                                KVASER_HAS_SILENT_MODE },
 522         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
 523                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 524         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
 525                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 526         { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
 527                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 528         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
 529                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 530         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
 531                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 532         { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
 533                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 534         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID) },
 535         { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID) },
 536
 537         /* USBCANII family IDs */
 538         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN2_PRODUCT_ID),
 539                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 540         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_REVB_PRODUCT_ID),
 541                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 542         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMORATOR_PRODUCT_ID),
 543                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 544         { USB_DEVICE(KVASER_VENDOR_ID, USB_VCI2_PRODUCT_ID),
 545                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 546
 547         { }
 548 };
 549 MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
 550
 551 static inline int kvaser_usb_send_msg(const struct kvaser_usb *dev,
 552                                       struct kvaser_msg *msg)
 553 {
 554         int actual_len;
 555
 556         return usb_bulk_msg(dev->udev,
 557                             usb_sndbulkpipe(dev->udev,
 558                                         dev->bulk_out->bEndpointAddress),
 559                             msg, msg->len, &actual_len,
 560                             USB_SEND_TIMEOUT);
 561 }
 562
 563 static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id,
 564                                struct kvaser_msg *msg)
 565 {
 566         struct kvaser_msg *tmp;
 567         void *buf;
 568         int actual_len;
 569         int err;
 570         int pos;
 571         unsigned long to = jiffies + msecs_to_jiffies(USB_RECV_TIMEOUT);
 572
 573         buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL);
 574         if (!buf)
 575                 return -ENOMEM;
 576
 577         do {
 578                 err = usb_bulk_msg(dev->udev,
 579                                    usb_rcvbulkpipe(dev->udev,
 580                                         dev->bulk_in->bEndpointAddress),
 581                                    buf, RX_BUFFER_SIZE, &actual_len,
 582                                    USB_RECV_TIMEOUT);
 583                 if (err < 0)
 584                         goto end;
 585
 586                 pos = 0;
 587                 while (pos <= actual_len - MSG_HEADER_LEN) {
 588                         tmp = buf + pos;
 589
 590                         /* Handle messages crossing the USB endpoint max packet
 591                          * size boundary. Check kvaser_usb_read_bulk_callback()
 592                          * for further details.
 593                          */
 594                         if (tmp->len == 0) {
 595                                 pos = round_up(pos,
 596                                                dev->bulk_in->wMaxPacketSize);
 597                                 continue;
 598                         }
 599
 600                         if (pos + tmp->len > actual_len) {
 601                                 dev_err(dev->udev->dev.parent,
 602                                         "Format error\n");
 603                                 break;
 604                         }
 605
 606                         if (tmp->id == id) {
 607                                 memcpy(msg, tmp, tmp->len);
 608                                 goto end;
 609                         }
 610
 611                         pos += tmp->len;
 612                 }
 613         } while (time_before(jiffies, to));
 614
 615         err = -EINVAL;
 616
 617 end:
 618         kfree(buf);
 619
 620         return err;
 621 }
 622
 623 static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev,
 624                                       u8 msg_id, int channel)
 625 {
 626         struct kvaser_msg *msg;
 627         int rc;
 628
 629         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
 630         if (!msg)
 631                 return -ENOMEM;
 632
 633         msg->id = msg_id;
 634         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 635         msg->u.simple.channel = channel;
 636         msg->u.simple.tid = 0xff;
 637
 638         rc = kvaser_usb_send_msg(dev, msg);
 639
 640         kfree(msg);
 641         return rc;
 642 }
 643
 644 static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
 645 {
 646         struct kvaser_msg msg;
 647         int err;
 648
 649         err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0);
 650         if (err)
 651                 return err;
 652
 653         err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg);
 654         if (err)
 655                 return err;
 656
 657         switch (dev->family) {
 658         case KVASER_LEAF:
 659                 dev->fw_version = le32_to_cpu(msg.u.leaf.softinfo.fw_version);
 660                 break;
 661         case KVASER_USBCAN:
 662                 dev->fw_version = le32_to_cpu(msg.u.usbcan.softinfo.fw_version);
 663                 break;
 664         }
 665
 666         return 0;
 667 }
 668
 669 static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
 670 {
 671         struct kvaser_msg msg;
 672         int err;
 673
 674         err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0);
 675         if (err)
 676                 return err;
 677
 678         err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg);
 679         if (err)
 680                 return err;
 681
 682         dev->nchannels = msg.u.cardinfo.nchannels;
 683         if ((dev->nchannels > MAX_NET_DEVICES) ||
 684             (dev->family == KVASER_USBCAN &&
 685              dev->nchannels > MAX_USBCAN_NET_DEVICES))
 686                 return -EINVAL;
 687
 688         return 0;
 689 }
 690
 691 static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
 692                                       const struct kvaser_msg *msg)
 693 {
 694         struct net_device_stats *stats;
 695         struct kvaser_usb_tx_urb_context *context;
 696         struct kvaser_usb_net_priv *priv;
 697         struct sk_buff *skb;
 698         struct can_frame *cf;
 699         unsigned long flags;
 700         u8 channel, tid;
 701
 702         channel = msg->u.tx_acknowledge_header.channel;
 703         tid = msg->u.tx_acknowledge_header.tid;
 704
 705         if (channel >= dev->nchannels) {
 706                 dev_err(dev->udev->dev.parent,
 707                         "Invalid channel number (%d)\n", channel);
 708                 return;
 709         }
 710
 711         priv = dev->nets[channel];
 712
 713         if (!netif_device_present(priv->netdev))
 714                 return;
 715
 716         stats = &priv->netdev->stats;
 717
 718         context = &priv->tx_contexts[tid % MAX_TX_URBS];
 719
 720         /* Sometimes the state change doesn't come after a bus-off event */
 721         if (priv->can.restart_ms &&
 722             (priv->can.state >= CAN_STATE_BUS_OFF)) {
 723                 skb = alloc_can_err_skb(priv->netdev, &cf);
 724                 if (skb) {
 725                         cf->can_id |= CAN_ERR_RESTARTED;
 726
 727                         stats->rx_packets++;
 728                         stats->rx_bytes += cf->can_dlc;
 729                         netif_rx(skb);
 730                 } else {
 731                         netdev_err(priv->netdev,
 732                                    "No memory left for err_skb\n");
 733                 }
 734
 735                 priv->can.can_stats.restarts++;
 736                 netif_carrier_on(priv->netdev);
 737
 738                 priv->can.state = CAN_STATE_ERROR_ACTIVE;
 739         }
 740
 741         stats->tx_packets++;
 742         stats->tx_bytes += context->dlc;
 743
 744         spin_lock_irqsave(&priv->tx_contexts_lock, flags);
 745
 746         can_get_echo_skb(priv->netdev, context->echo_index);
 747         context->echo_index = MAX_TX_URBS;
 748         --priv->active_tx_contexts;
 749         netif_wake_queue(priv->netdev);
 750
 751         spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
 752 }
 753
 754 static void kvaser_usb_simple_msg_callback(struct urb *urb)
 755 {
 756         struct net_device *netdev = urb->context;
 757
 758         kfree(urb->transfer_buffer);
 759
 760         if (urb->status)
 761                 netdev_warn(netdev, "urb status received: %d\n",
 762                             urb->status);
 763 }
 764
 765 static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
 766                                        u8 msg_id)
 767 {
 768         struct kvaser_usb *dev = priv->dev;
 769         struct net_device *netdev = priv->netdev;
 770         struct kvaser_msg *msg;
 771         struct urb *urb;
 772         void *buf;
 773         int err;
 774
 775         urb = usb_alloc_urb(0, GFP_ATOMIC);
 776         if (!urb) {
 777                 netdev_err(netdev, "No memory left for URBs\n");
 778                 return -ENOMEM;
 779         }
 780
 781         buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
 782         if (!buf) {
 783                 usb_free_urb(urb);
 784                 return -ENOMEM;
 785         }
 786
 787         msg = (struct kvaser_msg *)buf;
 788         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 789         msg->id = msg_id;
 790         msg->u.simple.channel = priv->channel;
 791
 792         usb_fill_bulk_urb(urb, dev->udev,
 793                           usb_sndbulkpipe(dev->udev,
 794                                           dev->bulk_out->bEndpointAddress),
 795                           buf, msg->len,
 796                           kvaser_usb_simple_msg_callback, netdev);
 797         usb_anchor_urb(urb, &priv->tx_submitted);
 798
 799         err = usb_submit_urb(urb, GFP_ATOMIC);
 800         if (err) {
 801                 netdev_err(netdev, "Error transmitting URB\n");
 802                 usb_unanchor_urb(urb);
 803                 usb_free_urb(urb);
 804                 return err;
 805         }
 806
 807         usb_free_urb(urb);
 808
 809         return 0;
 810 }
 811
 812 static void kvaser_usb_rx_error_update_can_state(struct kvaser_usb_net_priv *priv,
 813                                                  const struct kvaser_usb_error_summary *es,
 814                                                  struct can_frame *cf)
 815 {
 816         struct kvaser_usb *dev = priv->dev;
 817         struct net_device_stats *stats = &priv->netdev->stats;
 818         enum can_state cur_state, new_state, tx_state, rx_state;
 819
 820         netdev_dbg(priv->netdev, "Error status: 0x%02x\n", es->status);
 821
 822         new_state = cur_state = priv->can.state;
 823
 824         if (es->status & (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET))
 825                 new_state = CAN_STATE_BUS_OFF;
 826         else if (es->status & M16C_STATE_BUS_PASSIVE)
 827                 new_state = CAN_STATE_ERROR_PASSIVE;
 828         else if (es->status & M16C_STATE_BUS_ERROR) {
 829                 /* Guard against spurious error events after a busoff */
 830                 if (cur_state < CAN_STATE_BUS_OFF) {
 831                         if ((es->txerr >= 128) || (es->rxerr >= 128))
 832                                 new_state = CAN_STATE_ERROR_PASSIVE;
 833                         else if ((es->txerr >= 96) || (es->rxerr >= 96))
 834                                 new_state = CAN_STATE_ERROR_WARNING;
 835                         else if (cur_state > CAN_STATE_ERROR_ACTIVE)
 836                                 new_state = CAN_STATE_ERROR_ACTIVE;
 837                 }
 838         }
 839
 840         if (!es->status)
 841                 new_state = CAN_STATE_ERROR_ACTIVE;
 842
 843         if (new_state != cur_state) {
 844                 tx_state = (es->txerr >= es->rxerr) ? new_state : 0;
 845                 rx_state = (es->txerr <= es->rxerr) ? new_state : 0;
 846
 847                 can_change_state(priv->netdev, cf, tx_state, rx_state);
 848         }
 849
 850         if (priv->can.restart_ms &&
 851             (cur_state >= CAN_STATE_BUS_OFF) &&
 852             (new_state < CAN_STATE_BUS_OFF)) {
 853                 priv->can.can_stats.restarts++;
 854         }
 855
 856         switch (dev->family) {
 857         case KVASER_LEAF:
 858                 if (es->leaf.error_factor) {
 859                         priv->can.can_stats.bus_error++;
 860                         stats->rx_errors++;
 861                 }
 862                 break;
 863         case KVASER_USBCAN:
 864                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_TX_ERROR)
 865                         stats->tx_errors++;
 866                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_RX_ERROR)
 867                         stats->rx_errors++;
 868                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
 869                         priv->can.can_stats.bus_error++;
 870                 }
 871                 break;
 872         }
 873
 874         priv->bec.txerr = es->txerr;
 875         priv->bec.rxerr = es->rxerr;
 876 }
 877
 878 static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
 879                                 const struct kvaser_usb_error_summary *es)
 880 {
 881         struct can_frame *cf, tmp_cf = { .can_id = CAN_ERR_FLAG, .can_dlc = CAN_ERR_DLC };
 882         struct sk_buff *skb;
 883         struct net_device_stats *stats;
 884         struct kvaser_usb_net_priv *priv;
 885         enum can_state old_state, new_state;
 886
 887         if (es->channel >= dev->nchannels) {
 888                 dev_err(dev->udev->dev.parent,
 889                         "Invalid channel number (%d)\n", es->channel);
 890                 return;
 891         }
 892
 893         priv = dev->nets[es->channel];
 894         stats = &priv->netdev->stats;
 895
 896         /* Update all of the can interface's state and error counters before
 897          * trying any memory allocation that can actually fail with -ENOMEM.
 898          *
 899          * We send a temporary stack-allocated error can frame to
 900          * can_change_state() for the very same reason.
 901          *
 902          * TODO: Split can_change_state() responsibility between updating the
 903          * can interface's state and counters, and the setting up of can error
 904          * frame ID and data to userspace. Remove stack allocation afterwards.
 905          */
 906         old_state = priv->can.state;
 907         kvaser_usb_rx_error_update_can_state(priv, es, &tmp_cf);
 908         new_state = priv->can.state;
 909
 910         skb = alloc_can_err_skb(priv->netdev, &cf);
 911         if (!skb) {
 912                 stats->rx_dropped++;
 913                 return;
 914         }
 915         memcpy(cf, &tmp_cf, sizeof(*cf));
 916
 917         if (new_state != old_state) {
 918                 if (es->status &
 919                     (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) {
 920                         if (!priv->can.restart_ms)
 921                                 kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP);
 922                         netif_carrier_off(priv->netdev);
 923                 }
 924
 925                 if (priv->can.restart_ms &&
 926                     (old_state >= CAN_STATE_BUS_OFF) &&
 927                     (new_state < CAN_STATE_BUS_OFF)) {
 928                         cf->can_id |= CAN_ERR_RESTARTED;
 929                         netif_carrier_on(priv->netdev);
 930                 }
 931         }
 932
 933         switch (dev->family) {
 934         case KVASER_LEAF:
 935                 if (es->leaf.error_factor) {
 936                         cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
 937
 938                         if (es->leaf.error_factor & M16C_EF_ACKE)
 939                                 cf->data[3] |= (CAN_ERR_PROT_LOC_ACK);
 940                         if (es->leaf.error_factor & M16C_EF_CRCE)
 941                                 cf->data[3] |= (CAN_ERR_PROT_LOC_CRC_SEQ |
 942                                                 CAN_ERR_PROT_LOC_CRC_DEL);
 943                         if (es->leaf.error_factor & M16C_EF_FORME)
 944                                 cf->data[2] |= CAN_ERR_PROT_FORM;
 945                         if (es->leaf.error_factor & M16C_EF_STFE)
 946                                 cf->data[2] |= CAN_ERR_PROT_STUFF;
 947                         if (es->leaf.error_factor & M16C_EF_BITE0)
 948                                 cf->data[2] |= CAN_ERR_PROT_BIT0;
 949                         if (es->leaf.error_factor & M16C_EF_BITE1)
 950                                 cf->data[2] |= CAN_ERR_PROT_BIT1;
 951                         if (es->leaf.error_factor & M16C_EF_TRE)
 952                                 cf->data[2] |= CAN_ERR_PROT_TX;
 953                 }
 954                 break;
 955         case KVASER_USBCAN:
 956                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
 957                         cf->can_id |= CAN_ERR_BUSERROR;
 958                 }
 959                 break;
 960         }
 961
 962         cf->data[6] = es->txerr;
 963         cf->data[7] = es->rxerr;
 964
 965         stats->rx_packets++;
 966         stats->rx_bytes += cf->can_dlc;
 967         netif_rx(skb);
 968 }
 969
 970 /* For USBCAN, report error to userspace iff the channels's errors counter
 971  * has changed, or we're the only channel seeing a bus error state.
 972  */
 973 static void kvaser_usbcan_conditionally_rx_error(const struct kvaser_usb *dev,
 974                                                  struct kvaser_usb_error_summary *es)
 975 {
 976         struct kvaser_usb_net_priv *priv;
 977         int channel;
 978         bool report_error;
 979
 980         channel = es->channel;
 981         if (channel >= dev->nchannels) {
 982                 dev_err(dev->udev->dev.parent,
 983                         "Invalid channel number (%d)\n", channel);
 984                 return;
 985         }
 986
 987         priv = dev->nets[channel];
 988         report_error = false;
 989
 990         if (es->txerr != priv->bec.txerr) {
 991                 es->usbcan.error_state |= USBCAN_ERROR_STATE_TX_ERROR;
 992                 report_error = true;
 993         }
 994         if (es->rxerr != priv->bec.rxerr) {
 995                 es->usbcan.error_state |= USBCAN_ERROR_STATE_RX_ERROR;
 996                 report_error = true;
 997         }
 998         if ((es->status & M16C_STATE_BUS_ERROR) &&
 999             !(es->usbcan.other_ch_status & M16C_STATE_BUS_ERROR)) {
1000                 es->usbcan.error_state |= USBCAN_ERROR_STATE_BUSERROR;
1001                 report_error = true;
1002         }
1003
1004         if (report_error)
1005                 kvaser_usb_rx_error(dev, es);
1006 }
1007
1008 static void kvaser_usbcan_rx_error(const struct kvaser_usb *dev,
1009                                    const struct kvaser_msg *msg)
1010 {
1011         struct kvaser_usb_error_summary es = { };
1012
1013         switch (msg->id) {
1014         /* Sometimes errors are sent as unsolicited chip state events */
1015         case CMD_CHIP_STATE_EVENT:
1016                 es.channel = msg->u.usbcan.chip_state_event.channel;
1017                 es.status =  msg->u.usbcan.chip_state_event.status;
1018                 es.txerr = msg->u.usbcan.chip_state_event.tx_errors_count;
1019                 es.rxerr = msg->u.usbcan.chip_state_event.rx_errors_count;
1020                 kvaser_usbcan_conditionally_rx_error(dev, &es);
1021                 break;
1022
1023         case CMD_CAN_ERROR_EVENT:
1024                 es.channel = 0;
1025                 es.status = msg->u.usbcan.error_event.status_ch0;
1026                 es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch0;
1027                 es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch0;
1028                 es.usbcan.other_ch_status =
1029                         msg->u.usbcan.error_event.status_ch1;
1030                 kvaser_usbcan_conditionally_rx_error(dev, &es);
1031
1032                 /* The USBCAN firmware supports up to 2 channels.
1033                  * Now that ch0 was checked, check if ch1 has any errors.
1034                  */
1035                 if (dev->nchannels == MAX_USBCAN_NET_DEVICES) {
1036                         es.channel = 1;
1037                         es.status = msg->u.usbcan.error_event.status_ch1;
1038                         es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch1;
1039                         es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch1;
1040                         es.usbcan.other_ch_status =
1041                                 msg->u.usbcan.error_event.status_ch0;
1042                         kvaser_usbcan_conditionally_rx_error(dev, &es);
1043                 }
1044                 break;
1045
1046         default:
1047                 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
1048                         msg->id);
1049         }
1050 }
1051
1052 static void kvaser_leaf_rx_error(const struct kvaser_usb *dev,
1053                                  const struct kvaser_msg *msg)
1054 {
1055         struct kvaser_usb_error_summary es = { };
1056
1057         switch (msg->id) {
1058         case CMD_CAN_ERROR_EVENT:
1059                 es.channel = msg->u.leaf.error_event.channel;
1060                 es.status =  msg->u.leaf.error_event.status;
1061                 es.txerr = msg->u.leaf.error_event.tx_errors_count;
1062                 es.rxerr = msg->u.leaf.error_event.rx_errors_count;
1063                 es.leaf.error_factor = msg->u.leaf.error_event.error_factor;
1064                 break;
1065         case CMD_LEAF_LOG_MESSAGE:
1066                 es.channel = msg->u.leaf.log_message.channel;
1067                 es.status = msg->u.leaf.log_message.data[0];
1068                 es.txerr = msg->u.leaf.log_message.data[2];
1069                 es.rxerr = msg->u.leaf.log_message.data[3];
1070                 es.leaf.error_factor = msg->u.leaf.log_message.data[1];
1071                 break;
1072         case CMD_CHIP_STATE_EVENT:
1073                 es.channel = msg->u.leaf.chip_state_event.channel;
1074                 es.status =  msg->u.leaf.chip_state_event.status;
1075                 es.txerr = msg->u.leaf.chip_state_event.tx_errors_count;
1076                 es.rxerr = msg->u.leaf.chip_state_event.rx_errors_count;
1077                 es.leaf.error_factor = 0;
1078                 break;
1079         default:
1080                 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
1081                         msg->id);
1082                 return;
1083         }
1084
1085         kvaser_usb_rx_error(dev, &es);
1086 }
1087
1088 static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
1089                                   const struct kvaser_msg *msg)
1090 {
1091         struct can_frame *cf;
1092         struct sk_buff *skb;
1093         struct net_device_stats *stats = &priv->netdev->stats;
1094
1095         if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1096                                          MSG_FLAG_NERR)) {
1097                 netdev_err(priv->netdev, "Unknow error (flags: 0x%02x)\n",
1098                            msg->u.rx_can_header.flag);
1099
1100                 stats->rx_errors++;
1101                 return;
1102         }
1103
1104         if (msg->u.rx_can_header.flag & MSG_FLAG_OVERRUN) {
1105                 stats->rx_over_errors++;
1106                 stats->rx_errors++;
1107
1108                 skb = alloc_can_err_skb(priv->netdev, &cf);
1109                 if (!skb) {
1110                         stats->rx_dropped++;
1111                         return;
1112                 }
1113
1114                 cf->can_id |= CAN_ERR_CRTL;
1115                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
1116
1117                 stats->rx_packets++;
1118                 stats->rx_bytes += cf->can_dlc;
1119                 netif_rx(skb);
1120         }
1121 }
1122
1123 static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
1124                                   const struct kvaser_msg *msg)
1125 {
1126         struct kvaser_usb_net_priv *priv;
1127         struct can_frame *cf;
1128         struct sk_buff *skb;
1129         struct net_device_stats *stats;
1130         u8 channel = msg->u.rx_can_header.channel;
1131         const u8 *rx_msg = NULL;        /* GCC */
1132
1133         if (channel >= dev->nchannels) {
1134                 dev_err(dev->udev->dev.parent,
1135                         "Invalid channel number (%d)\n", channel);
1136                 return;
1137         }
1138
1139         priv = dev->nets[channel];
1140         stats = &priv->netdev->stats;
1141
1142         if ((msg->u.rx_can_header.flag & MSG_FLAG_ERROR_FRAME) &&
1143             (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE)) {
1144                 kvaser_leaf_rx_error(dev, msg);
1145                 return;
1146         } else if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1147                                                 MSG_FLAG_NERR |
1148                                                 MSG_FLAG_OVERRUN)) {
1149                 kvaser_usb_rx_can_err(priv, msg);
1150                 return;
1151         } else if (msg->u.rx_can_header.flag & ~MSG_FLAG_REMOTE_FRAME) {
1152                 netdev_warn(priv->netdev,
1153                             "Unhandled frame (flags: 0x%02x)",
1154                             msg->u.rx_can_header.flag);
1155                 return;
1156         }
1157
1158         switch (dev->family) {
1159         case KVASER_LEAF:
1160                 rx_msg = msg->u.leaf.rx_can.msg;
1161                 break;
1162         case KVASER_USBCAN:
1163                 rx_msg = msg->u.usbcan.rx_can.msg;
1164                 break;
1165         }
1166
1167         skb = alloc_can_skb(priv->netdev, &cf);
1168         if (!skb) {
1169                 stats->tx_dropped++;
1170                 return;
1171         }
1172
1173         if (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE) {
1174                 cf->can_id = le32_to_cpu(msg->u.leaf.log_message.id);
1175                 if (cf->can_id & KVASER_EXTENDED_FRAME)
1176                         cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
1177                 else
1178                         cf->can_id &= CAN_SFF_MASK;
1179
1180                 cf->can_dlc = get_can_dlc(msg->u.leaf.log_message.dlc);
1181
1182                 if (msg->u.leaf.log_message.flags & MSG_FLAG_REMOTE_FRAME)
1183                         cf->can_id |= CAN_RTR_FLAG;
1184                 else
1185                         memcpy(cf->data, &msg->u.leaf.log_message.data,
1186                                cf->can_dlc);
1187         } else {
1188                 cf->can_id = ((rx_msg[0] & 0x1f) << 6) | (rx_msg[1] & 0x3f);
1189
1190                 if (msg->id == CMD_RX_EXT_MESSAGE) {
1191                         cf->can_id <<= 18;
1192                         cf->can_id |= ((rx_msg[2] & 0x0f) << 14) |
1193                                       ((rx_msg[3] & 0xff) << 6) |
1194                                       (rx_msg[4] & 0x3f);
1195                         cf->can_id |= CAN_EFF_FLAG;
1196                 }
1197
1198                 cf->can_dlc = get_can_dlc(rx_msg[5]);
1199
1200                 if (msg->u.rx_can_header.flag & MSG_FLAG_REMOTE_FRAME)
1201                         cf->can_id |= CAN_RTR_FLAG;
1202                 else
1203                         memcpy(cf->data, &rx_msg[6],
1204                                cf->can_dlc);
1205         }
1206
1207         stats->rx_packets++;
1208         stats->rx_bytes += cf->can_dlc;
1209         netif_rx(skb);
1210 }
1211
1212 static void kvaser_usb_start_chip_reply(const struct kvaser_usb *dev,
1213                                         const struct kvaser_msg *msg)
1214 {
1215         struct kvaser_usb_net_priv *priv;
1216         u8 channel = msg->u.simple.channel;
1217
1218         if (channel >= dev->nchannels) {
1219                 dev_err(dev->udev->dev.parent,
1220                         "Invalid channel number (%d)\n", channel);
1221                 return;
1222         }
1223
1224         priv = dev->nets[channel];
1225
1226         if (completion_done(&priv->start_comp) &&
1227             netif_queue_stopped(priv->netdev)) {
1228                 netif_wake_queue(priv->netdev);
1229         } else {
1230                 netif_start_queue(priv->netdev);
1231                 complete(&priv->start_comp);
1232         }
1233 }
1234
1235 static void kvaser_usb_stop_chip_reply(const struct kvaser_usb *dev,
1236                                        const struct kvaser_msg *msg)
1237 {
1238         struct kvaser_usb_net_priv *priv;
1239         u8 channel = msg->u.simple.channel;
1240
1241         if (channel >= dev->nchannels) {
1242                 dev_err(dev->udev->dev.parent,
1243                         "Invalid channel number (%d)\n", channel);
1244                 return;
1245         }
1246
1247         priv = dev->nets[channel];
1248
1249         complete(&priv->stop_comp);
1250 }
1251
1252 static void kvaser_usb_handle_message(const struct kvaser_usb *dev,
1253                                       const struct kvaser_msg *msg)
1254 {
1255         switch (msg->id) {
1256         case CMD_START_CHIP_REPLY:
1257                 kvaser_usb_start_chip_reply(dev, msg);
1258                 break;
1259
1260         case CMD_STOP_CHIP_REPLY:
1261                 kvaser_usb_stop_chip_reply(dev, msg);
1262                 break;
1263
1264         case CMD_RX_STD_MESSAGE:
1265         case CMD_RX_EXT_MESSAGE:
1266                 kvaser_usb_rx_can_msg(dev, msg);
1267                 break;
1268
1269         case CMD_LEAF_LOG_MESSAGE:
1270                 if (dev->family != KVASER_LEAF)
1271                         goto warn;
1272                 kvaser_usb_rx_can_msg(dev, msg);
1273                 break;
1274
1275         case CMD_CHIP_STATE_EVENT:
1276         case CMD_CAN_ERROR_EVENT:
1277                 if (dev->family == KVASER_LEAF)
1278                         kvaser_leaf_rx_error(dev, msg);
1279                 else
1280                         kvaser_usbcan_rx_error(dev, msg);
1281                 break;
1282
1283         case CMD_TX_ACKNOWLEDGE:
1284                 kvaser_usb_tx_acknowledge(dev, msg);
1285                 break;
1286
1287         /* Ignored messages */
1288         case CMD_USBCAN_CLOCK_OVERFLOW_EVENT:
1289                 if (dev->family != KVASER_USBCAN)
1290                         goto warn;
1291                 break;
1292
1293         default:
1294 warn:           dev_warn(dev->udev->dev.parent,
1295                          "Unhandled message (%d)\n", msg->id);
1296                 break;
1297         }
1298 }
1299
1300 static void kvaser_usb_read_bulk_callback(struct urb *urb)
1301 {
1302         struct kvaser_usb *dev = urb->context;
1303         struct kvaser_msg *msg;
1304         int pos = 0;
1305         int err, i;
1306
1307         switch (urb->status) {
1308         case 0:
1309                 break;
1310         case -ENOENT:
1311         case -ESHUTDOWN:
1312                 return;
1313         default:
1314                 dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n",
1315                          urb->status);
1316                 goto resubmit_urb;
1317         }
1318
1319         while (pos <= urb->actual_length - MSG_HEADER_LEN) {
1320                 msg = urb->transfer_buffer + pos;
1321
1322                 /* The Kvaser firmware can only read and write messages that
1323                  * does not cross the USB's endpoint wMaxPacketSize boundary.
1324                  * If a follow-up command crosses such boundary, firmware puts
1325                  * a placeholder zero-length command in its place then aligns
1326                  * the real command to the next max packet size.
1327                  *
1328                  * Handle such cases or we're going to miss a significant
1329                  * number of events in case of a heavy rx load on the bus.
1330                  */
1331                 if (msg->len == 0) {
1332                         pos = round_up(pos, dev->bulk_in->wMaxPacketSize);
1333                         continue;
1334                 }
1335
1336                 if (pos + msg->len > urb->actual_length) {
1337                         dev_err(dev->udev->dev.parent, "Format error\n");
1338                         break;
1339                 }
1340
1341                 kvaser_usb_handle_message(dev, msg);
1342                 pos += msg->len;
1343         }
1344
1345 resubmit_urb:
1346         usb_fill_bulk_urb(urb, dev->udev,
1347                           usb_rcvbulkpipe(dev->udev,
1348                                           dev->bulk_in->bEndpointAddress),
1349                           urb->transfer_buffer, RX_BUFFER_SIZE,
1350                           kvaser_usb_read_bulk_callback, dev);
1351
1352         err = usb_submit_urb(urb, GFP_ATOMIC);
1353         if (err == -ENODEV) {
1354                 for (i = 0; i < dev->nchannels; i++) {
1355                         if (!dev->nets[i])
1356                                 continue;
1357
1358                         netif_device_detach(dev->nets[i]->netdev);
1359                 }
1360         } else if (err) {
1361                 dev_err(dev->udev->dev.parent,
1362                         "Failed resubmitting read bulk urb: %d\n", err);
1363         }
1364
1365         return;
1366 }
1367
1368 static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
1369 {
1370         int i, err = 0;
1371
1372         if (dev->rxinitdone)
1373                 return 0;
1374
1375         for (i = 0; i < MAX_RX_URBS; i++) {
1376                 struct urb *urb = NULL;
1377                 u8 *buf = NULL;
1378                 dma_addr_t buf_dma;
1379
1380                 urb = usb_alloc_urb(0, GFP_KERNEL);
1381                 if (!urb) {
1382                         dev_warn(dev->udev->dev.parent,
1383                                  "No memory left for URBs\n");
1384                         err = -ENOMEM;
1385                         break;
1386                 }
1387
1388                 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE,
1389                                          GFP_KERNEL, &buf_dma);
1390                 if (!buf) {
1391                         dev_warn(dev->udev->dev.parent,
1392                                  "No memory left for USB buffer\n");
1393                         usb_free_urb(urb);
1394                         err = -ENOMEM;
1395                         break;
1396                 }
1397
1398                 usb_fill_bulk_urb(urb, dev->udev,
1399                                   usb_rcvbulkpipe(dev->udev,
1400                                           dev->bulk_in->bEndpointAddress),
1401                                   buf, RX_BUFFER_SIZE,
1402                                   kvaser_usb_read_bulk_callback,
1403                                   dev);
1404                 urb->transfer_dma = buf_dma;
1405                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1406                 usb_anchor_urb(urb, &dev->rx_submitted);
1407
1408                 err = usb_submit_urb(urb, GFP_KERNEL);
1409                 if (err) {
1410                         usb_unanchor_urb(urb);
1411                         usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
1412                                           buf_dma);
1413                         usb_free_urb(urb);
1414                         break;
1415                 }
1416
1417                 dev->rxbuf[i] = buf;
1418                 dev->rxbuf_dma[i] = buf_dma;
1419
1420                 usb_free_urb(urb);
1421         }
1422
1423         if (i == 0) {
1424                 dev_warn(dev->udev->dev.parent,
1425                          "Cannot setup read URBs, error %d\n", err);
1426                 return err;
1427         } else if (i < MAX_RX_URBS) {
1428                 dev_warn(dev->udev->dev.parent,
1429                          "RX performances may be slow\n");
1430         }
1431
1432         dev->rxinitdone = true;
1433
1434         return 0;
1435 }
1436
1437 static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1438 {
1439         struct kvaser_msg *msg;
1440         int rc;
1441
1442         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1443         if (!msg)
1444                 return -ENOMEM;
1445
1446         msg->id = CMD_SET_CTRL_MODE;
1447         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_ctrl_mode);
1448         msg->u.ctrl_mode.tid = 0xff;
1449         msg->u.ctrl_mode.channel = priv->channel;
1450
1451         if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1452                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1453         else
1454                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1455
1456         rc = kvaser_usb_send_msg(priv->dev, msg);
1457
1458         kfree(msg);
1459         return rc;
1460 }
1461
1462 static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv)
1463 {
1464         int err;
1465
1466         init_completion(&priv->start_comp);
1467
1468         err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP,
1469                                          priv->channel);
1470         if (err)
1471                 return err;
1472
1473         if (!wait_for_completion_timeout(&priv->start_comp,
1474                                          msecs_to_jiffies(START_TIMEOUT)))
1475                 return -ETIMEDOUT;
1476
1477         return 0;
1478 }
1479
1480 static int kvaser_usb_open(struct net_device *netdev)
1481 {
1482         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1483         struct kvaser_usb *dev = priv->dev;
1484         int err;
1485
1486         err = open_candev(netdev);
1487         if (err)
1488                 return err;
1489
1490         err = kvaser_usb_setup_rx_urbs(dev);
1491         if (err)
1492                 goto error;
1493
1494         err = kvaser_usb_set_opt_mode(priv);
1495         if (err)
1496                 goto error;
1497
1498         err = kvaser_usb_start_chip(priv);
1499         if (err) {
1500                 netdev_warn(netdev, "Cannot start device, error %d\n", err);
1501                 goto error;
1502         }
1503
1504         priv->can.state = CAN_STATE_ERROR_ACTIVE;
1505
1506         return 0;
1507
1508 error:
1509         close_candev(netdev);
1510         return err;
1511 }
1512
1513 static void kvaser_usb_reset_tx_urb_contexts(struct kvaser_usb_net_priv *priv)
1514 {
1515         int i;
1516
1517         priv->active_tx_contexts = 0;
1518         for (i = 0; i < MAX_TX_URBS; i++)
1519                 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
1520 }
1521
1522 /* This method might sleep. Do not call it in the atomic context
1523  * of URB completions.
1524  */
1525 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
1526 {
1527         usb_kill_anchored_urbs(&priv->tx_submitted);
1528         kvaser_usb_reset_tx_urb_contexts(priv);
1529 }
1530
1531 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
1532 {
1533         int i;
1534
1535         usb_kill_anchored_urbs(&dev->rx_submitted);
1536
1537         for (i = 0; i < MAX_RX_URBS; i++)
1538                 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
1539                                   dev->rxbuf[i],
1540                                   dev->rxbuf_dma[i]);
1541
1542         for (i = 0; i < dev->nchannels; i++) {
1543                 struct kvaser_usb_net_priv *priv = dev->nets[i];
1544
1545                 if (priv)
1546                         kvaser_usb_unlink_tx_urbs(priv);
1547         }
1548 }
1549
1550 static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv)
1551 {
1552         int err;
1553
1554         init_completion(&priv->stop_comp);
1555
1556         err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP,
1557                                          priv->channel);
1558         if (err)
1559                 return err;
1560
1561         if (!wait_for_completion_timeout(&priv->stop_comp,
1562                                          msecs_to_jiffies(STOP_TIMEOUT)))
1563                 return -ETIMEDOUT;
1564
1565         return 0;
1566 }
1567
1568 static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv)
1569 {
1570         struct kvaser_msg *msg;
1571         int rc;
1572
1573         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1574         if (!msg)
1575                 return -ENOMEM;
1576
1577         msg->id = CMD_FLUSH_QUEUE;
1578         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_flush_queue);
1579         msg->u.flush_queue.channel = priv->channel;
1580         msg->u.flush_queue.flags = 0x00;
1581
1582         rc = kvaser_usb_send_msg(priv->dev, msg);
1583
1584         kfree(msg);
1585         return rc;
1586 }
1587
1588 static int kvaser_usb_close(struct net_device *netdev)
1589 {
1590         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1591         struct kvaser_usb *dev = priv->dev;
1592         int err;
1593
1594         netif_stop_queue(netdev);
1595
1596         err = kvaser_usb_flush_queue(priv);
1597         if (err)
1598                 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
1599
1600         if (kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel))
1601                 netdev_warn(netdev, "Cannot reset card, error %d\n", err);
1602
1603         err = kvaser_usb_stop_chip(priv);
1604         if (err)
1605                 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
1606
1607         /* reset tx contexts */
1608         kvaser_usb_unlink_tx_urbs(priv);
1609
1610         priv->can.state = CAN_STATE_STOPPED;
1611         close_candev(priv->netdev);
1612
1613         return 0;
1614 }
1615
1616 static void kvaser_usb_write_bulk_callback(struct urb *urb)
1617 {
1618         struct kvaser_usb_tx_urb_context *context = urb->context;
1619         struct kvaser_usb_net_priv *priv;
1620         struct net_device *netdev;
1621
1622         if (WARN_ON(!context))
1623                 return;
1624
1625         priv = context->priv;
1626         netdev = priv->netdev;
1627
1628         kfree(urb->transfer_buffer);
1629
1630         if (!netif_device_present(netdev))
1631                 return;
1632
1633         if (urb->status)
1634                 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1635 }
1636
1637 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1638                                          struct net_device *netdev)
1639 {
1640         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1641         struct kvaser_usb *dev = priv->dev;
1642         struct net_device_stats *stats = &netdev->stats;
1643         struct can_frame *cf = (struct can_frame *)skb->data;
1644         struct kvaser_usb_tx_urb_context *context = NULL;
1645         struct urb *urb;
1646         void *buf;
1647         struct kvaser_msg *msg;
1648         int i, err, ret = NETDEV_TX_OK;
1649         u8 *msg_tx_can_flags = NULL;            /* GCC */
1650         unsigned long flags;
1651
1652         if (can_dropped_invalid_skb(netdev, skb))
1653                 return NETDEV_TX_OK;
1654
1655         urb = usb_alloc_urb(0, GFP_ATOMIC);
1656         if (!urb) {
1657                 netdev_err(netdev, "No memory left for URBs\n");
1658                 stats->tx_dropped++;
1659                 dev_kfree_skb(skb);
1660                 return NETDEV_TX_OK;
1661         }
1662
1663         buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1664         if (!buf) {
1665                 stats->tx_dropped++;
1666                 dev_kfree_skb(skb);
1667                 goto freeurb;
1668         }
1669
1670         msg = buf;
1671         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
1672         msg->u.tx_can.channel = priv->channel;
1673
1674         switch (dev->family) {
1675         case KVASER_LEAF:
1676                 msg_tx_can_flags = &msg->u.tx_can.leaf.flags;
1677                 break;
1678         case KVASER_USBCAN:
1679                 msg_tx_can_flags = &msg->u.tx_can.usbcan.flags;
1680                 break;
1681         }
1682
1683         *msg_tx_can_flags = 0;
1684
1685         if (cf->can_id & CAN_EFF_FLAG) {
1686                 msg->id = CMD_TX_EXT_MESSAGE;
1687                 msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
1688                 msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
1689                 msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
1690                 msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
1691                 msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
1692         } else {
1693                 msg->id = CMD_TX_STD_MESSAGE;
1694                 msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
1695                 msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
1696         }
1697
1698         msg->u.tx_can.msg[5] = cf->can_dlc;
1699         memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
1700
1701         if (cf->can_id & CAN_RTR_FLAG)
1702                 *msg_tx_can_flags |= MSG_FLAG_REMOTE_FRAME;
1703
1704         spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1705         for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++) {
1706                 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
1707                         context = &priv->tx_contexts[i];
1708
1709                         context->echo_index = i;
1710                         can_put_echo_skb(skb, netdev, context->echo_index);
1711                         ++priv->active_tx_contexts;
1712                         if (priv->active_tx_contexts >= MAX_TX_URBS)
1713                                 netif_stop_queue(netdev);
1714
1715                         break;
1716                 }
1717         }
1718         spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1719
1720         /* This should never happen; it implies a flow control bug */
1721         if (!context) {
1722                 netdev_warn(netdev, "cannot find free context\n");
1723
1724                 kfree(buf);
1725                 ret =  NETDEV_TX_BUSY;
1726                 goto freeurb;
1727         }
1728
1729         context->priv = priv;
1730         context->dlc = cf->can_dlc;
1731
1732         msg->u.tx_can.tid = context->echo_index;
1733
1734         usb_fill_bulk_urb(urb, dev->udev,
1735                           usb_sndbulkpipe(dev->udev,
1736                                           dev->bulk_out->bEndpointAddress),
1737                           buf, msg->len,
1738                           kvaser_usb_write_bulk_callback, context);
1739         usb_anchor_urb(urb, &priv->tx_submitted);
1740
1741         err = usb_submit_urb(urb, GFP_ATOMIC);
1742         if (unlikely(err)) {
1743                 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1744
1745                 can_free_echo_skb(netdev, context->echo_index);
1746                 context->echo_index = MAX_TX_URBS;
1747                 --priv->active_tx_contexts;
1748                 netif_wake_queue(netdev);
1749
1750                 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1751
1752                 usb_unanchor_urb(urb);
1753
1754                 stats->tx_dropped++;
1755
1756                 if (err == -ENODEV)
1757                         netif_device_detach(netdev);
1758                 else
1759                         netdev_warn(netdev, "Failed tx_urb %d\n", err);
1760
1761                 goto freeurb;
1762         }
1763
1764         ret = NETDEV_TX_OK;
1765
1766 freeurb:
1767         usb_free_urb(urb);
1768         return ret;
1769 }
1770
1771 static const struct net_device_ops kvaser_usb_netdev_ops = {
1772         .ndo_open = kvaser_usb_open,
1773         .ndo_stop = kvaser_usb_close,
1774         .ndo_start_xmit = kvaser_usb_start_xmit,
1775         .ndo_change_mtu = can_change_mtu,
1776 };
1777
1778 static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1779         .name = "kvaser_usb",
1780         .tseg1_min = KVASER_USB_TSEG1_MIN,
1781         .tseg1_max = KVASER_USB_TSEG1_MAX,
1782         .tseg2_min = KVASER_USB_TSEG2_MIN,
1783         .tseg2_max = KVASER_USB_TSEG2_MAX,
1784         .sjw_max = KVASER_USB_SJW_MAX,
1785         .brp_min = KVASER_USB_BRP_MIN,
1786         .brp_max = KVASER_USB_BRP_MAX,
1787         .brp_inc = KVASER_USB_BRP_INC,
1788 };
1789
1790 static int kvaser_usb_set_bittiming(struct net_device *netdev)
1791 {
1792         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1793         struct can_bittiming *bt = &priv->can.bittiming;
1794         struct kvaser_usb *dev = priv->dev;
1795         struct kvaser_msg *msg;
1796         int rc;
1797
1798         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1799         if (!msg)
1800                 return -ENOMEM;
1801
1802         msg->id = CMD_SET_BUS_PARAMS;
1803         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1804         msg->u.busparams.channel = priv->channel;
1805         msg->u.busparams.tid = 0xff;
1806         msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1807         msg->u.busparams.sjw = bt->sjw;
1808         msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1809         msg->u.busparams.tseg2 = bt->phase_seg2;
1810
1811         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1812                 msg->u.busparams.no_samp = 3;
1813         else
1814                 msg->u.busparams.no_samp = 1;
1815
1816         rc = kvaser_usb_send_msg(dev, msg);
1817
1818         kfree(msg);
1819         return rc;
1820 }
1821
1822 static int kvaser_usb_set_mode(struct net_device *netdev,
1823                                enum can_mode mode)
1824 {
1825         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1826         int err;
1827
1828         switch (mode) {
1829         case CAN_MODE_START:
1830                 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1831                 if (err)
1832                         return err;
1833                 break;
1834         default:
1835                 return -EOPNOTSUPP;
1836         }
1837
1838         return 0;
1839 }
1840
1841 static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1842                                        struct can_berr_counter *bec)
1843 {
1844         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1845
1846         *bec = priv->bec;
1847
1848         return 0;
1849 }
1850
1851 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1852 {
1853         int i;
1854
1855         for (i = 0; i < dev->nchannels; i++) {
1856                 if (!dev->nets[i])
1857                         continue;
1858
1859                 unregister_netdev(dev->nets[i]->netdev);
1860         }
1861
1862         kvaser_usb_unlink_all_urbs(dev);
1863
1864         for (i = 0; i < dev->nchannels; i++) {
1865                 if (!dev->nets[i])
1866                         continue;
1867
1868                 free_candev(dev->nets[i]->netdev);
1869         }
1870 }
1871
1872 static int kvaser_usb_init_one(struct usb_interface *intf,
1873                                const struct usb_device_id *id, int channel)
1874 {
1875         struct kvaser_usb *dev = usb_get_intfdata(intf);
1876         struct net_device *netdev;
1877         struct kvaser_usb_net_priv *priv;
1878         int err;
1879
1880         err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, channel);
1881         if (err)
1882                 return err;
1883
1884         netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
1885         if (!netdev) {
1886                 dev_err(&intf->dev, "Cannot alloc candev\n");
1887                 return -ENOMEM;
1888         }
1889
1890         priv = netdev_priv(netdev);
1891
1892         init_usb_anchor(&priv->tx_submitted);
1893         init_completion(&priv->start_comp);
1894         init_completion(&priv->stop_comp);
1895
1896         priv->dev = dev;
1897         priv->netdev = netdev;
1898         priv->channel = channel;
1899
1900         spin_lock_init(&priv->tx_contexts_lock);
1901         kvaser_usb_reset_tx_urb_contexts(priv);
1902
1903         priv->can.state = CAN_STATE_STOPPED;
1904         priv->can.clock.freq = CAN_USB_CLOCK;
1905         priv->can.bittiming_const = &kvaser_usb_bittiming_const;
1906         priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
1907         priv->can.do_set_mode = kvaser_usb_set_mode;
1908         if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
1909                 priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
1910         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
1911         if (id->driver_info & KVASER_HAS_SILENT_MODE)
1912                 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1913
1914         netdev->flags |= IFF_ECHO;
1915
1916         netdev->netdev_ops = &kvaser_usb_netdev_ops;
1917
1918         SET_NETDEV_DEV(netdev, &intf->dev);
1919         netdev->dev_id = channel;
1920
1921         dev->nets[channel] = priv;
1922
1923         err = register_candev(netdev);
1924         if (err) {
1925                 dev_err(&intf->dev, "Failed to register can device\n");
1926                 free_candev(netdev);
1927                 dev->nets[channel] = NULL;
1928                 return err;
1929         }
1930
1931         netdev_dbg(netdev, "device registered\n");
1932
1933         return 0;
1934 }
1935
1936 static int kvaser_usb_get_endpoints(const struct usb_interface *intf,
1937                                     struct usb_endpoint_descriptor **in,
1938                                     struct usb_endpoint_descriptor **out)
1939 {
1940         const struct usb_host_interface *iface_desc;
1941         struct usb_endpoint_descriptor *endpoint;
1942         int i;
1943
1944         iface_desc = &intf->altsetting[0];
1945
1946         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1947                 endpoint = &iface_desc->endpoint[i].desc;
1948
1949                 if (!*in && usb_endpoint_is_bulk_in(endpoint))
1950                         *in = endpoint;
1951
1952                 if (!*out && usb_endpoint_is_bulk_out(endpoint))
1953                         *out = endpoint;
1954
1955                 /* use first bulk endpoint for in and out */
1956                 if (*in && *out)
1957                         return 0;
1958         }
1959
1960         return -ENODEV;
1961 }
1962
1963 static int kvaser_usb_probe(struct usb_interface *intf,
1964                             const struct usb_device_id *id)
1965 {
1966         struct kvaser_usb *dev;
1967         int err = -ENOMEM;
1968         int i, retry = 3;
1969
1970         dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
1971         if (!dev)
1972                 return -ENOMEM;
1973
1974         if (kvaser_is_leaf(id)) {
1975                 dev->family = KVASER_LEAF;
1976         } else if (kvaser_is_usbcan(id)) {
1977                 dev->family = KVASER_USBCAN;
1978         } else {
1979                 dev_err(&intf->dev,
1980                         "Product ID (%d) does not belong to any known Kvaser USB family",
1981                         id->idProduct);
1982                 return -ENODEV;
1983         }
1984
1985         err = kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
1986         if (err) {
1987                 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
1988                 return err;
1989         }
1990
1991         dev->udev = interface_to_usbdev(intf);
1992
1993         init_usb_anchor(&dev->rx_submitted);
1994
1995         usb_set_intfdata(intf, dev);
1996
1997         /* On some x86 laptops, plugging a Kvaser device again after
1998          * an unplug makes the firmware always ignore the very first
1999          * command. For such a case, provide some room for retries
2000          * instead of completely exiting the driver.
2001          */
2002         do {
2003                 err = kvaser_usb_get_software_info(dev);
2004         } while (--retry && err == -ETIMEDOUT);
2005
2006         if (err) {
2007                 dev_err(&intf->dev,
2008                         "Cannot get software infos, error %d\n", err);
2009                 return err;
2010         }
2011
2012         err = kvaser_usb_get_card_info(dev);
2013         if (err) {
2014                 dev_err(&intf->dev,
2015                         "Cannot get card infos, error %d\n", err);
2016                 return err;
2017         }
2018
2019         dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
2020                 ((dev->fw_version >> 24) & 0xff),
2021                 ((dev->fw_version >> 16) & 0xff),
2022                 (dev->fw_version & 0xffff));
2023
2024         for (i = 0; i < dev->nchannels; i++) {
2025                 err = kvaser_usb_init_one(intf, id, i);
2026                 if (err) {
2027                         kvaser_usb_remove_interfaces(dev);
2028                         return err;
2029                 }
2030         }
2031
2032         return 0;
2033 }
2034
2035 static void kvaser_usb_disconnect(struct usb_interface *intf)
2036 {
2037         struct kvaser_usb *dev = usb_get_intfdata(intf);
2038
2039         usb_set_intfdata(intf, NULL);
2040
2041         if (!dev)
2042                 return;
2043
2044         kvaser_usb_remove_interfaces(dev);
2045 }
2046
2047 static struct usb_driver kvaser_usb_driver = {
2048         .name = "kvaser_usb",
2049         .probe = kvaser_usb_probe,
2050         .disconnect = kvaser_usb_disconnect,
2051         .id_table = kvaser_usb_table,
2052 };
2053
2054 module_usb_driver(kvaser_usb_driver);
2055
2056 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
2057 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
2058 MODULE_LICENSE("GPL v2");