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