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_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 #define USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID 290
  63 #define USB_USBCAN_LIGHT_2HS_PRODUCT_ID 291
  64 #define USB_MINI_PCIE_2HS_PRODUCT_ID    292
  65
  66 static inline bool kvaser_is_leaf(const struct usb_device_id *id)
  67 {
  68         return id->idProduct >= USB_LEAF_DEVEL_PRODUCT_ID &&
  69                id->idProduct <= USB_MINI_PCIE_2HS_PRODUCT_ID;
  70 }
  71
  72 /* Kvaser USBCan-II devices */
  73 #define USB_USBCAN_REVB_PRODUCT_ID      2
  74 #define USB_VCI2_PRODUCT_ID             3
  75 #define USB_USBCAN2_PRODUCT_ID          4
  76 #define USB_MEMORATOR_PRODUCT_ID        5
  77
  78 static inline bool kvaser_is_usbcan(const struct usb_device_id *id)
  79 {
  80         return id->idProduct >= USB_USBCAN_REVB_PRODUCT_ID &&
  81                id->idProduct <= USB_MEMORATOR_PRODUCT_ID;
  82 }
  83
  84 /* USB devices features */
  85 #define KVASER_HAS_SILENT_MODE          BIT(0)
  86 #define KVASER_HAS_TXRX_ERRORS          BIT(1)
  87
  88 /* Message header size */
  89 #define MSG_HEADER_LEN                  2
  90
  91 /* Can message flags */
  92 #define MSG_FLAG_ERROR_FRAME            BIT(0)
  93 #define MSG_FLAG_OVERRUN                BIT(1)
  94 #define MSG_FLAG_NERR                   BIT(2)
  95 #define MSG_FLAG_WAKEUP                 BIT(3)
  96 #define MSG_FLAG_REMOTE_FRAME           BIT(4)
  97 #define MSG_FLAG_RESERVED               BIT(5)
  98 #define MSG_FLAG_TX_ACK                 BIT(6)
  99 #define MSG_FLAG_TX_REQUEST             BIT(7)
 100
 101 /* Can states (M16C CxSTRH register) */
 102 #define M16C_STATE_BUS_RESET            BIT(0)
 103 #define M16C_STATE_BUS_ERROR            BIT(4)
 104 #define M16C_STATE_BUS_PASSIVE          BIT(5)
 105 #define M16C_STATE_BUS_OFF              BIT(6)
 106
 107 /* Can msg ids */
 108 #define CMD_RX_STD_MESSAGE              12
 109 #define CMD_TX_STD_MESSAGE              13
 110 #define CMD_RX_EXT_MESSAGE              14
 111 #define CMD_TX_EXT_MESSAGE              15
 112 #define CMD_SET_BUS_PARAMS              16
 113 #define CMD_GET_BUS_PARAMS              17
 114 #define CMD_GET_BUS_PARAMS_REPLY        18
 115 #define CMD_GET_CHIP_STATE              19
 116 #define CMD_CHIP_STATE_EVENT            20
 117 #define CMD_SET_CTRL_MODE               21
 118 #define CMD_GET_CTRL_MODE               22
 119 #define CMD_GET_CTRL_MODE_REPLY         23
 120 #define CMD_RESET_CHIP                  24
 121 #define CMD_RESET_CARD                  25
 122 #define CMD_START_CHIP                  26
 123 #define CMD_START_CHIP_REPLY            27
 124 #define CMD_STOP_CHIP                   28
 125 #define CMD_STOP_CHIP_REPLY             29
 126
 127 #define CMD_LEAF_GET_CARD_INFO2         32
 128 #define CMD_USBCAN_RESET_CLOCK          32
 129 #define CMD_USBCAN_CLOCK_OVERFLOW_EVENT 33
 130
 131 #define CMD_GET_CARD_INFO               34
 132 #define CMD_GET_CARD_INFO_REPLY         35
 133 #define CMD_GET_SOFTWARE_INFO           38
 134 #define CMD_GET_SOFTWARE_INFO_REPLY     39
 135 #define CMD_ERROR_EVENT                 45
 136 #define CMD_FLUSH_QUEUE                 48
 137 #define CMD_RESET_ERROR_COUNTER         49
 138 #define CMD_TX_ACKNOWLEDGE              50
 139 #define CMD_CAN_ERROR_EVENT             51
 140
 141 #define CMD_LEAF_USB_THROTTLE           77
 142 #define CMD_LEAF_LOG_MESSAGE            106
 143
 144 /* error factors */
 145 #define M16C_EF_ACKE                    BIT(0)
 146 #define M16C_EF_CRCE                    BIT(1)
 147 #define M16C_EF_FORME                   BIT(2)
 148 #define M16C_EF_STFE                    BIT(3)
 149 #define M16C_EF_BITE0                   BIT(4)
 150 #define M16C_EF_BITE1                   BIT(5)
 151 #define M16C_EF_RCVE                    BIT(6)
 152 #define M16C_EF_TRE                     BIT(7)
 153
 154 /* Only Leaf-based devices can report M16C error factors,
 155  * thus define our own error status flags for USBCANII
 156  */
 157 #define USBCAN_ERROR_STATE_NONE         0
 158 #define USBCAN_ERROR_STATE_TX_ERROR     BIT(0)
 159 #define USBCAN_ERROR_STATE_RX_ERROR     BIT(1)
 160 #define USBCAN_ERROR_STATE_BUSERROR     BIT(2)
 161
 162 /* bittiming parameters */
 163 #define KVASER_USB_TSEG1_MIN            1
 164 #define KVASER_USB_TSEG1_MAX            16
 165 #define KVASER_USB_TSEG2_MIN            1
 166 #define KVASER_USB_TSEG2_MAX            8
 167 #define KVASER_USB_SJW_MAX              4
 168 #define KVASER_USB_BRP_MIN              1
 169 #define KVASER_USB_BRP_MAX              64
 170 #define KVASER_USB_BRP_INC              1
 171
 172 /* ctrl modes */
 173 #define KVASER_CTRL_MODE_NORMAL         1
 174 #define KVASER_CTRL_MODE_SILENT         2
 175 #define KVASER_CTRL_MODE_SELFRECEPTION  3
 176 #define KVASER_CTRL_MODE_OFF            4
 177
 178 /* Extended CAN identifier flag */
 179 #define KVASER_EXTENDED_FRAME           BIT(31)
 180
 181 /* Kvaser USB CAN dongles are divided into two major families:
 182  * - Leaf: Based on Renesas M32C, running firmware labeled as 'filo'
 183  * - UsbcanII: Based on Renesas M16C, running firmware labeled as 'helios'
 184  */
 185 enum kvaser_usb_family {
 186         KVASER_LEAF,
 187         KVASER_USBCAN,
 188 };
 189
 190 struct kvaser_msg_simple {
 191         u8 tid;
 192         u8 channel;
 193 } __packed;
 194
 195 struct kvaser_msg_cardinfo {
 196         u8 tid;
 197         u8 nchannels;
 198         union {
 199                 struct {
 200                         __le32 serial_number;
 201                         __le32 padding;
 202                 } __packed leaf0;
 203                 struct {
 204                         __le32 serial_number_low;
 205                         __le32 serial_number_high;
 206                 } __packed usbcan0;
 207         } __packed;
 208         __le32 clock_resolution;
 209         __le32 mfgdate;
 210         u8 ean[8];
 211         u8 hw_revision;
 212         union {
 213                 struct {
 214                         u8 usb_hs_mode;
 215                 } __packed leaf1;
 216                 struct {
 217                         u8 padding;
 218                 } __packed usbcan1;
 219         } __packed;
 220         __le16 padding;
 221 } __packed;
 222
 223 struct kvaser_msg_cardinfo2 {
 224         u8 tid;
 225         u8 reserved;
 226         u8 pcb_id[24];
 227         __le32 oem_unlock_code;
 228 } __packed;
 229
 230 struct leaf_msg_softinfo {
 231         u8 tid;
 232         u8 padding0;
 233         __le32 sw_options;
 234         __le32 fw_version;
 235         __le16 max_outstanding_tx;
 236         __le16 padding1[9];
 237 } __packed;
 238
 239 struct usbcan_msg_softinfo {
 240         u8 tid;
 241         u8 fw_name[5];
 242         __le16 max_outstanding_tx;
 243         u8 padding[6];
 244         __le32 fw_version;
 245         __le16 checksum;
 246         __le16 sw_options;
 247 } __packed;
 248
 249 struct kvaser_msg_busparams {
 250         u8 tid;
 251         u8 channel;
 252         __le32 bitrate;
 253         u8 tseg1;
 254         u8 tseg2;
 255         u8 sjw;
 256         u8 no_samp;
 257 } __packed;
 258
 259 struct kvaser_msg_tx_can {
 260         u8 channel;
 261         u8 tid;
 262         u8 msg[14];
 263         union {
 264                 struct {
 265                         u8 padding;
 266                         u8 flags;
 267                 } __packed leaf;
 268                 struct {
 269                         u8 flags;
 270                         u8 padding;
 271                 } __packed usbcan;
 272         } __packed;
 273 } __packed;
 274
 275 struct kvaser_msg_rx_can_header {
 276         u8 channel;
 277         u8 flag;
 278 } __packed;
 279
 280 struct leaf_msg_rx_can {
 281         u8 channel;
 282         u8 flag;
 283
 284         __le16 time[3];
 285         u8 msg[14];
 286 } __packed;
 287
 288 struct usbcan_msg_rx_can {
 289         u8 channel;
 290         u8 flag;
 291
 292         u8 msg[14];
 293         __le16 time;
 294 } __packed;
 295
 296 struct leaf_msg_chip_state_event {
 297         u8 tid;
 298         u8 channel;
 299
 300         __le16 time[3];
 301         u8 tx_errors_count;
 302         u8 rx_errors_count;
 303
 304         u8 status;
 305         u8 padding[3];
 306 } __packed;
 307
 308 struct usbcan_msg_chip_state_event {
 309         u8 tid;
 310         u8 channel;
 311
 312         u8 tx_errors_count;
 313         u8 rx_errors_count;
 314         __le16 time;
 315
 316         u8 status;
 317         u8 padding[3];
 318 } __packed;
 319
 320 struct kvaser_msg_tx_acknowledge_header {
 321         u8 channel;
 322         u8 tid;
 323 } __packed;
 324
 325 struct leaf_msg_tx_acknowledge {
 326         u8 channel;
 327         u8 tid;
 328
 329         __le16 time[3];
 330         u8 flags;
 331         u8 time_offset;
 332 } __packed;
 333
 334 struct usbcan_msg_tx_acknowledge {
 335         u8 channel;
 336         u8 tid;
 337
 338         __le16 time;
 339         __le16 padding;
 340 } __packed;
 341
 342 struct leaf_msg_error_event {
 343         u8 tid;
 344         u8 flags;
 345         __le16 time[3];
 346         u8 channel;
 347         u8 padding;
 348         u8 tx_errors_count;
 349         u8 rx_errors_count;
 350         u8 status;
 351         u8 error_factor;
 352 } __packed;
 353
 354 struct usbcan_msg_error_event {
 355         u8 tid;
 356         u8 padding;
 357         u8 tx_errors_count_ch0;
 358         u8 rx_errors_count_ch0;
 359         u8 tx_errors_count_ch1;
 360         u8 rx_errors_count_ch1;
 361         u8 status_ch0;
 362         u8 status_ch1;
 363         __le16 time;
 364 } __packed;
 365
 366 struct kvaser_msg_ctrl_mode {
 367         u8 tid;
 368         u8 channel;
 369         u8 ctrl_mode;
 370         u8 padding[3];
 371 } __packed;
 372
 373 struct kvaser_msg_flush_queue {
 374         u8 tid;
 375         u8 channel;
 376         u8 flags;
 377         u8 padding[3];
 378 } __packed;
 379
 380 struct leaf_msg_log_message {
 381         u8 channel;
 382         u8 flags;
 383         __le16 time[3];
 384         u8 dlc;
 385         u8 time_offset;
 386         __le32 id;
 387         u8 data[8];
 388 } __packed;
 389
 390 struct kvaser_msg {
 391         u8 len;
 392         u8 id;
 393         union   {
 394                 struct kvaser_msg_simple simple;
 395                 struct kvaser_msg_cardinfo cardinfo;
 396                 struct kvaser_msg_cardinfo2 cardinfo2;
 397                 struct kvaser_msg_busparams busparams;
 398
 399                 struct kvaser_msg_rx_can_header rx_can_header;
 400                 struct kvaser_msg_tx_acknowledge_header tx_acknowledge_header;
 401
 402                 union {
 403                         struct leaf_msg_softinfo softinfo;
 404                         struct leaf_msg_rx_can rx_can;
 405                         struct leaf_msg_chip_state_event chip_state_event;
 406                         struct leaf_msg_tx_acknowledge tx_acknowledge;
 407                         struct leaf_msg_error_event error_event;
 408                         struct leaf_msg_log_message log_message;
 409                 } __packed leaf;
 410
 411                 union {
 412                         struct usbcan_msg_softinfo softinfo;
 413                         struct usbcan_msg_rx_can rx_can;
 414                         struct usbcan_msg_chip_state_event chip_state_event;
 415                         struct usbcan_msg_tx_acknowledge tx_acknowledge;
 416                         struct usbcan_msg_error_event error_event;
 417                 } __packed usbcan;
 418
 419                 struct kvaser_msg_tx_can tx_can;
 420                 struct kvaser_msg_ctrl_mode ctrl_mode;
 421                 struct kvaser_msg_flush_queue flush_queue;
 422         } u;
 423 } __packed;
 424
 425 /* Summary of a kvaser error event, for a unified Leaf/Usbcan error
 426  * handling. Some discrepancies between the two families exist:
 427  *
 428  * - USBCAN firmware does not report M16C "error factors"
 429  * - USBCAN controllers has difficulties reporting if the raised error
 430  *   event is for ch0 or ch1. They leave such arbitration to the OS
 431  *   driver by letting it compare error counters with previous values
 432  *   and decide the error event's channel. Thus for USBCAN, the channel
 433  *   field is only advisory.
 434  */
 435 struct kvaser_usb_error_summary {
 436         u8 channel, status, txerr, rxerr;
 437         union {
 438                 struct {
 439                         u8 error_factor;
 440                 } leaf;
 441                 struct {
 442                         u8 other_ch_status;
 443                         u8 error_state;
 444                 } usbcan;
 445         };
 446 };
 447
 448 /* Context for an outstanding, not yet ACKed, transmission */
 449 struct kvaser_usb_tx_urb_context {
 450         struct kvaser_usb_net_priv *priv;
 451         u32 echo_index;
 452         int dlc;
 453 };
 454
 455 struct kvaser_usb {
 456         struct usb_device *udev;
 457         struct kvaser_usb_net_priv *nets[MAX_NET_DEVICES];
 458
 459         struct usb_endpoint_descriptor *bulk_in, *bulk_out;
 460         struct usb_anchor rx_submitted;
 461
 462         /* @max_tx_urbs: Firmware-reported maximum number of oustanding,
 463          * not yet ACKed, transmissions on this device. This value is
 464          * also used as a sentinel for marking free tx contexts.
 465          */
 466         u32 fw_version;
 467         unsigned int nchannels;
 468         unsigned int max_tx_urbs;
 469         enum kvaser_usb_family family;
 470
 471         bool rxinitdone;
 472         void *rxbuf[MAX_RX_URBS];
 473         dma_addr_t rxbuf_dma[MAX_RX_URBS];
 474 };
 475
 476 struct kvaser_usb_net_priv {
 477         struct can_priv can;
 478         struct can_berr_counter bec;
 479
 480         struct kvaser_usb *dev;
 481         struct net_device *netdev;
 482         int channel;
 483
 484         struct completion start_comp, stop_comp;
 485         struct usb_anchor tx_submitted;
 486
 487         spinlock_t tx_contexts_lock;
 488         int active_tx_contexts;
 489         struct kvaser_usb_tx_urb_context tx_contexts[];
 490 };
 491
 492 static const struct usb_device_id kvaser_usb_table[] = {
 493         /* Leaf family IDs */
 494         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
 495         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
 496         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
 497                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 498                                KVASER_HAS_SILENT_MODE },
 499         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
 500                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 501                                KVASER_HAS_SILENT_MODE },
 502         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
 503                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 504                                KVASER_HAS_SILENT_MODE },
 505         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
 506                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 507                                KVASER_HAS_SILENT_MODE },
 508         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
 509                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 510                                KVASER_HAS_SILENT_MODE },
 511         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
 512                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 513                                KVASER_HAS_SILENT_MODE },
 514         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
 515                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 516                                KVASER_HAS_SILENT_MODE },
 517         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
 518                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 519                                KVASER_HAS_SILENT_MODE },
 520         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
 521                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 522                                KVASER_HAS_SILENT_MODE },
 523         { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
 524                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 525         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
 526         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
 527                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 528                                KVASER_HAS_SILENT_MODE },
 529         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
 530                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 531         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
 532                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 533         { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
 534                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 535         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
 536                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 537         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
 538                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 539         { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
 540                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 541         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID) },
 542         { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID) },
 543         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID) },
 544         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_LIGHT_2HS_PRODUCT_ID) },
 545         { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_2HS_PRODUCT_ID) },
 546
 547         /* USBCANII family IDs */
 548         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN2_PRODUCT_ID),
 549                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 550         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_REVB_PRODUCT_ID),
 551                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 552         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMORATOR_PRODUCT_ID),
 553                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 554         { USB_DEVICE(KVASER_VENDOR_ID, USB_VCI2_PRODUCT_ID),
 555                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 556
 557         { }
 558 };
 559 MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
 560
 561 static inline int kvaser_usb_send_msg(const struct kvaser_usb *dev,
 562                                       struct kvaser_msg *msg)
 563 {
 564         int actual_len;
 565
 566         return usb_bulk_msg(dev->udev,
 567                             usb_sndbulkpipe(dev->udev,
 568                                         dev->bulk_out->bEndpointAddress),
 569                             msg, msg->len, &actual_len,
 570                             USB_SEND_TIMEOUT);
 571 }
 572
 573 static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id,
 574                                struct kvaser_msg *msg)
 575 {
 576         struct kvaser_msg *tmp;
 577         void *buf;
 578         int actual_len;
 579         int err;
 580         int pos;
 581         unsigned long to = jiffies + msecs_to_jiffies(USB_RECV_TIMEOUT);
 582
 583         buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL);
 584         if (!buf)
 585                 return -ENOMEM;
 586
 587         do {
 588                 err = usb_bulk_msg(dev->udev,
 589                                    usb_rcvbulkpipe(dev->udev,
 590                                         dev->bulk_in->bEndpointAddress),
 591                                    buf, RX_BUFFER_SIZE, &actual_len,
 592                                    USB_RECV_TIMEOUT);
 593                 if (err < 0)
 594                         goto end;
 595
 596                 pos = 0;
 597                 while (pos <= actual_len - MSG_HEADER_LEN) {
 598                         tmp = buf + pos;
 599
 600                         /* Handle messages crossing the USB endpoint max packet
 601                          * size boundary. Check kvaser_usb_read_bulk_callback()
 602                          * for further details.
 603                          */
 604                         if (tmp->len == 0) {
 605                                 pos = round_up(pos, le16_to_cpu(dev->bulk_in->
 606                                                                 wMaxPacketSize));
 607                                 continue;
 608                         }
 609
 610                         if (pos + tmp->len > actual_len) {
 611                                 dev_err(dev->udev->dev.parent,
 612                                         "Format error\n");
 613                                 break;
 614                         }
 615
 616                         if (tmp->id == id) {
 617                                 memcpy(msg, tmp, tmp->len);
 618                                 goto end;
 619                         }
 620
 621                         pos += tmp->len;
 622                 }
 623         } while (time_before(jiffies, to));
 624
 625         err = -EINVAL;
 626
 627 end:
 628         kfree(buf);
 629
 630         return err;
 631 }
 632
 633 static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev,
 634                                       u8 msg_id, int channel)
 635 {
 636         struct kvaser_msg *msg;
 637         int rc;
 638
 639         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
 640         if (!msg)
 641                 return -ENOMEM;
 642
 643         msg->id = msg_id;
 644         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 645         msg->u.simple.channel = channel;
 646         msg->u.simple.tid = 0xff;
 647
 648         rc = kvaser_usb_send_msg(dev, msg);
 649
 650         kfree(msg);
 651         return rc;
 652 }
 653
 654 static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
 655 {
 656         struct kvaser_msg msg;
 657         int err;
 658
 659         err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0);
 660         if (err)
 661                 return err;
 662
 663         err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg);
 664         if (err)
 665                 return err;
 666
 667         switch (dev->family) {
 668         case KVASER_LEAF:
 669                 dev->fw_version = le32_to_cpu(msg.u.leaf.softinfo.fw_version);
 670                 dev->max_tx_urbs =
 671                         le16_to_cpu(msg.u.leaf.softinfo.max_outstanding_tx);
 672                 break;
 673         case KVASER_USBCAN:
 674                 dev->fw_version = le32_to_cpu(msg.u.usbcan.softinfo.fw_version);
 675                 dev->max_tx_urbs =
 676                         le16_to_cpu(msg.u.usbcan.softinfo.max_outstanding_tx);
 677                 break;
 678         }
 679
 680         return 0;
 681 }
 682
 683 static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
 684 {
 685         struct kvaser_msg msg;
 686         int err;
 687
 688         err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0);
 689         if (err)
 690                 return err;
 691
 692         err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg);
 693         if (err)
 694                 return err;
 695
 696         dev->nchannels = msg.u.cardinfo.nchannels;
 697         if ((dev->nchannels > MAX_NET_DEVICES) ||
 698             (dev->family == KVASER_USBCAN &&
 699              dev->nchannels > MAX_USBCAN_NET_DEVICES))
 700                 return -EINVAL;
 701
 702         return 0;
 703 }
 704
 705 static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
 706                                       const struct kvaser_msg *msg)
 707 {
 708         struct net_device_stats *stats;
 709         struct kvaser_usb_tx_urb_context *context;
 710         struct kvaser_usb_net_priv *priv;
 711         struct sk_buff *skb;
 712         struct can_frame *cf;
 713         unsigned long flags;
 714         u8 channel, tid;
 715
 716         channel = msg->u.tx_acknowledge_header.channel;
 717         tid = msg->u.tx_acknowledge_header.tid;
 718
 719         if (channel >= dev->nchannels) {
 720                 dev_err(dev->udev->dev.parent,
 721                         "Invalid channel number (%d)\n", channel);
 722                 return;
 723         }
 724
 725         priv = dev->nets[channel];
 726
 727         if (!netif_device_present(priv->netdev))
 728                 return;
 729
 730         stats = &priv->netdev->stats;
 731
 732         context = &priv->tx_contexts[tid % dev->max_tx_urbs];
 733
 734         /* Sometimes the state change doesn't come after a bus-off event */
 735         if (priv->can.restart_ms &&
 736             (priv->can.state >= CAN_STATE_BUS_OFF)) {
 737                 skb = alloc_can_err_skb(priv->netdev, &cf);
 738                 if (skb) {
 739                         cf->can_id |= CAN_ERR_RESTARTED;
 740
 741                         stats->rx_packets++;
 742                         stats->rx_bytes += cf->can_dlc;
 743                         netif_rx(skb);
 744                 } else {
 745                         netdev_err(priv->netdev,
 746                                    "No memory left for err_skb\n");
 747                 }
 748
 749                 priv->can.can_stats.restarts++;
 750                 netif_carrier_on(priv->netdev);
 751
 752                 priv->can.state = CAN_STATE_ERROR_ACTIVE;
 753         }
 754
 755         stats->tx_packets++;
 756         stats->tx_bytes += context->dlc;
 757
 758         spin_lock_irqsave(&priv->tx_contexts_lock, flags);
 759
 760         can_get_echo_skb(priv->netdev, context->echo_index);
 761         context->echo_index = dev->max_tx_urbs;
 762         --priv->active_tx_contexts;
 763         netif_wake_queue(priv->netdev);
 764
 765         spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
 766 }
 767
 768 static void kvaser_usb_simple_msg_callback(struct urb *urb)
 769 {
 770         struct net_device *netdev = urb->context;
 771
 772         kfree(urb->transfer_buffer);
 773
 774         if (urb->status)
 775                 netdev_warn(netdev, "urb status received: %d\n",
 776                             urb->status);
 777 }
 778
 779 static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
 780                                        u8 msg_id)
 781 {
 782         struct kvaser_usb *dev = priv->dev;
 783         struct net_device *netdev = priv->netdev;
 784         struct kvaser_msg *msg;
 785         struct urb *urb;
 786         void *buf;
 787         int err;
 788
 789         urb = usb_alloc_urb(0, GFP_ATOMIC);
 790         if (!urb) {
 791                 netdev_err(netdev, "No memory left for URBs\n");
 792                 return -ENOMEM;
 793         }
 794
 795         buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
 796         if (!buf) {
 797                 usb_free_urb(urb);
 798                 return -ENOMEM;
 799         }
 800
 801         msg = (struct kvaser_msg *)buf;
 802         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 803         msg->id = msg_id;
 804         msg->u.simple.channel = priv->channel;
 805
 806         usb_fill_bulk_urb(urb, dev->udev,
 807                           usb_sndbulkpipe(dev->udev,
 808                                           dev->bulk_out->bEndpointAddress),
 809                           buf, msg->len,
 810                           kvaser_usb_simple_msg_callback, netdev);
 811         usb_anchor_urb(urb, &priv->tx_submitted);
 812
 813         err = usb_submit_urb(urb, GFP_ATOMIC);
 814         if (err) {
 815                 netdev_err(netdev, "Error transmitting URB\n");
 816                 usb_unanchor_urb(urb);
 817                 usb_free_urb(urb);
 818                 return err;
 819         }
 820
 821         usb_free_urb(urb);
 822
 823         return 0;
 824 }
 825
 826 static void kvaser_usb_rx_error_update_can_state(struct kvaser_usb_net_priv *priv,
 827                                                  const struct kvaser_usb_error_summary *es,
 828                                                  struct can_frame *cf)
 829 {
 830         struct kvaser_usb *dev = priv->dev;
 831         struct net_device_stats *stats = &priv->netdev->stats;
 832         enum can_state cur_state, new_state, tx_state, rx_state;
 833
 834         netdev_dbg(priv->netdev, "Error status: 0x%02x\n", es->status);
 835
 836         new_state = cur_state = priv->can.state;
 837
 838         if (es->status & (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET))
 839                 new_state = CAN_STATE_BUS_OFF;
 840         else if (es->status & M16C_STATE_BUS_PASSIVE)
 841                 new_state = CAN_STATE_ERROR_PASSIVE;
 842         else if (es->status & M16C_STATE_BUS_ERROR) {
 843                 /* Guard against spurious error events after a busoff */
 844                 if (cur_state < CAN_STATE_BUS_OFF) {
 845                         if ((es->txerr >= 128) || (es->rxerr >= 128))
 846                                 new_state = CAN_STATE_ERROR_PASSIVE;
 847                         else if ((es->txerr >= 96) || (es->rxerr >= 96))
 848                                 new_state = CAN_STATE_ERROR_WARNING;
 849                         else if (cur_state > CAN_STATE_ERROR_ACTIVE)
 850                                 new_state = CAN_STATE_ERROR_ACTIVE;
 851                 }
 852         }
 853
 854         if (!es->status)
 855                 new_state = CAN_STATE_ERROR_ACTIVE;
 856
 857         if (new_state != cur_state) {
 858                 tx_state = (es->txerr >= es->rxerr) ? new_state : 0;
 859                 rx_state = (es->txerr <= es->rxerr) ? new_state : 0;
 860
 861                 can_change_state(priv->netdev, cf, tx_state, rx_state);
 862         }
 863
 864         if (priv->can.restart_ms &&
 865             (cur_state >= CAN_STATE_BUS_OFF) &&
 866             (new_state < CAN_STATE_BUS_OFF)) {
 867                 priv->can.can_stats.restarts++;
 868         }
 869
 870         switch (dev->family) {
 871         case KVASER_LEAF:
 872                 if (es->leaf.error_factor) {
 873                         priv->can.can_stats.bus_error++;
 874                         stats->rx_errors++;
 875                 }
 876                 break;
 877         case KVASER_USBCAN:
 878                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_TX_ERROR)
 879                         stats->tx_errors++;
 880                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_RX_ERROR)
 881                         stats->rx_errors++;
 882                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
 883                         priv->can.can_stats.bus_error++;
 884                 }
 885                 break;
 886         }
 887
 888         priv->bec.txerr = es->txerr;
 889         priv->bec.rxerr = es->rxerr;
 890 }
 891
 892 static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
 893                                 const struct kvaser_usb_error_summary *es)
 894 {
 895         struct can_frame *cf, tmp_cf = { .can_id = CAN_ERR_FLAG, .can_dlc = CAN_ERR_DLC };
 896         struct sk_buff *skb;
 897         struct net_device_stats *stats;
 898         struct kvaser_usb_net_priv *priv;
 899         enum can_state old_state, new_state;
 900
 901         if (es->channel >= dev->nchannels) {
 902                 dev_err(dev->udev->dev.parent,
 903                         "Invalid channel number (%d)\n", es->channel);
 904                 return;
 905         }
 906
 907         priv = dev->nets[es->channel];
 908         stats = &priv->netdev->stats;
 909
 910         /* Update all of the can interface's state and error counters before
 911          * trying any memory allocation that can actually fail with -ENOMEM.
 912          *
 913          * We send a temporary stack-allocated error can frame to
 914          * can_change_state() for the very same reason.
 915          *
 916          * TODO: Split can_change_state() responsibility between updating the
 917          * can interface's state and counters, and the setting up of can error
 918          * frame ID and data to userspace. Remove stack allocation afterwards.
 919          */
 920         old_state = priv->can.state;
 921         kvaser_usb_rx_error_update_can_state(priv, es, &tmp_cf);
 922         new_state = priv->can.state;
 923
 924         skb = alloc_can_err_skb(priv->netdev, &cf);
 925         if (!skb) {
 926                 stats->rx_dropped++;
 927                 return;
 928         }
 929         memcpy(cf, &tmp_cf, sizeof(*cf));
 930
 931         if (new_state != old_state) {
 932                 if (es->status &
 933                     (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) {
 934                         if (!priv->can.restart_ms)
 935                                 kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP);
 936                         netif_carrier_off(priv->netdev);
 937                 }
 938
 939                 if (priv->can.restart_ms &&
 940                     (old_state >= CAN_STATE_BUS_OFF) &&
 941                     (new_state < CAN_STATE_BUS_OFF)) {
 942                         cf->can_id |= CAN_ERR_RESTARTED;
 943                         netif_carrier_on(priv->netdev);
 944                 }
 945         }
 946
 947         switch (dev->family) {
 948         case KVASER_LEAF:
 949                 if (es->leaf.error_factor) {
 950                         cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
 951
 952                         if (es->leaf.error_factor & M16C_EF_ACKE)
 953                                 cf->data[3] = CAN_ERR_PROT_LOC_ACK;
 954                         if (es->leaf.error_factor & M16C_EF_CRCE)
 955                                 cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
 956                         if (es->leaf.error_factor & M16C_EF_FORME)
 957                                 cf->data[2] |= CAN_ERR_PROT_FORM;
 958                         if (es->leaf.error_factor & M16C_EF_STFE)
 959                                 cf->data[2] |= CAN_ERR_PROT_STUFF;
 960                         if (es->leaf.error_factor & M16C_EF_BITE0)
 961                                 cf->data[2] |= CAN_ERR_PROT_BIT0;
 962                         if (es->leaf.error_factor & M16C_EF_BITE1)
 963                                 cf->data[2] |= CAN_ERR_PROT_BIT1;
 964                         if (es->leaf.error_factor & M16C_EF_TRE)
 965                                 cf->data[2] |= CAN_ERR_PROT_TX;
 966                 }
 967                 break;
 968         case KVASER_USBCAN:
 969                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
 970                         cf->can_id |= CAN_ERR_BUSERROR;
 971                 }
 972                 break;
 973         }
 974
 975         cf->data[6] = es->txerr;
 976         cf->data[7] = es->rxerr;
 977
 978         stats->rx_packets++;
 979         stats->rx_bytes += cf->can_dlc;
 980         netif_rx(skb);
 981 }
 982
 983 /* For USBCAN, report error to userspace iff the channels's errors counter
 984  * has changed, or we're the only channel seeing a bus error state.
 985  */
 986 static void kvaser_usbcan_conditionally_rx_error(const struct kvaser_usb *dev,
 987                                                  struct kvaser_usb_error_summary *es)
 988 {
 989         struct kvaser_usb_net_priv *priv;
 990         int channel;
 991         bool report_error;
 992
 993         channel = es->channel;
 994         if (channel >= dev->nchannels) {
 995                 dev_err(dev->udev->dev.parent,
 996                         "Invalid channel number (%d)\n", channel);
 997                 return;
 998         }
 999
1000         priv = dev->nets[channel];
1001         report_error = false;
1002
1003         if (es->txerr != priv->bec.txerr) {
1004                 es->usbcan.error_state |= USBCAN_ERROR_STATE_TX_ERROR;
1005                 report_error = true;
1006         }
1007         if (es->rxerr != priv->bec.rxerr) {
1008                 es->usbcan.error_state |= USBCAN_ERROR_STATE_RX_ERROR;
1009                 report_error = true;
1010         }
1011         if ((es->status & M16C_STATE_BUS_ERROR) &&
1012             !(es->usbcan.other_ch_status & M16C_STATE_BUS_ERROR)) {
1013                 es->usbcan.error_state |= USBCAN_ERROR_STATE_BUSERROR;
1014                 report_error = true;
1015         }
1016
1017         if (report_error)
1018                 kvaser_usb_rx_error(dev, es);
1019 }
1020
1021 static void kvaser_usbcan_rx_error(const struct kvaser_usb *dev,
1022                                    const struct kvaser_msg *msg)
1023 {
1024         struct kvaser_usb_error_summary es = { };
1025
1026         switch (msg->id) {
1027         /* Sometimes errors are sent as unsolicited chip state events */
1028         case CMD_CHIP_STATE_EVENT:
1029                 es.channel = msg->u.usbcan.chip_state_event.channel;
1030                 es.status =  msg->u.usbcan.chip_state_event.status;
1031                 es.txerr = msg->u.usbcan.chip_state_event.tx_errors_count;
1032                 es.rxerr = msg->u.usbcan.chip_state_event.rx_errors_count;
1033                 kvaser_usbcan_conditionally_rx_error(dev, &es);
1034                 break;
1035
1036         case CMD_CAN_ERROR_EVENT:
1037                 es.channel = 0;
1038                 es.status = msg->u.usbcan.error_event.status_ch0;
1039                 es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch0;
1040                 es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch0;
1041                 es.usbcan.other_ch_status =
1042                         msg->u.usbcan.error_event.status_ch1;
1043                 kvaser_usbcan_conditionally_rx_error(dev, &es);
1044
1045                 /* The USBCAN firmware supports up to 2 channels.
1046                  * Now that ch0 was checked, check if ch1 has any errors.
1047                  */
1048                 if (dev->nchannels == MAX_USBCAN_NET_DEVICES) {
1049                         es.channel = 1;
1050                         es.status = msg->u.usbcan.error_event.status_ch1;
1051                         es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch1;
1052                         es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch1;
1053                         es.usbcan.other_ch_status =
1054                                 msg->u.usbcan.error_event.status_ch0;
1055                         kvaser_usbcan_conditionally_rx_error(dev, &es);
1056                 }
1057                 break;
1058
1059         default:
1060                 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
1061                         msg->id);
1062         }
1063 }
1064
1065 static void kvaser_leaf_rx_error(const struct kvaser_usb *dev,
1066                                  const struct kvaser_msg *msg)
1067 {
1068         struct kvaser_usb_error_summary es = { };
1069
1070         switch (msg->id) {
1071         case CMD_CAN_ERROR_EVENT:
1072                 es.channel = msg->u.leaf.error_event.channel;
1073                 es.status =  msg->u.leaf.error_event.status;
1074                 es.txerr = msg->u.leaf.error_event.tx_errors_count;
1075                 es.rxerr = msg->u.leaf.error_event.rx_errors_count;
1076                 es.leaf.error_factor = msg->u.leaf.error_event.error_factor;
1077                 break;
1078         case CMD_LEAF_LOG_MESSAGE:
1079                 es.channel = msg->u.leaf.log_message.channel;
1080                 es.status = msg->u.leaf.log_message.data[0];
1081                 es.txerr = msg->u.leaf.log_message.data[2];
1082                 es.rxerr = msg->u.leaf.log_message.data[3];
1083                 es.leaf.error_factor = msg->u.leaf.log_message.data[1];
1084                 break;
1085         case CMD_CHIP_STATE_EVENT:
1086                 es.channel = msg->u.leaf.chip_state_event.channel;
1087                 es.status =  msg->u.leaf.chip_state_event.status;
1088                 es.txerr = msg->u.leaf.chip_state_event.tx_errors_count;
1089                 es.rxerr = msg->u.leaf.chip_state_event.rx_errors_count;
1090                 es.leaf.error_factor = 0;
1091                 break;
1092         default:
1093                 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
1094                         msg->id);
1095                 return;
1096         }
1097
1098         kvaser_usb_rx_error(dev, &es);
1099 }
1100
1101 static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
1102                                   const struct kvaser_msg *msg)
1103 {
1104         struct can_frame *cf;
1105         struct sk_buff *skb;
1106         struct net_device_stats *stats = &priv->netdev->stats;
1107
1108         if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1109                                          MSG_FLAG_NERR)) {
1110                 netdev_err(priv->netdev, "Unknown error (flags: 0x%02x)\n",
1111                            msg->u.rx_can_header.flag);
1112
1113                 stats->rx_errors++;
1114                 return;
1115         }
1116
1117         if (msg->u.rx_can_header.flag & MSG_FLAG_OVERRUN) {
1118                 stats->rx_over_errors++;
1119                 stats->rx_errors++;
1120
1121                 skb = alloc_can_err_skb(priv->netdev, &cf);
1122                 if (!skb) {
1123                         stats->rx_dropped++;
1124                         return;
1125                 }
1126
1127                 cf->can_id |= CAN_ERR_CRTL;
1128                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
1129
1130                 stats->rx_packets++;
1131                 stats->rx_bytes += cf->can_dlc;
1132                 netif_rx(skb);
1133         }
1134 }
1135
1136 static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
1137                                   const struct kvaser_msg *msg)
1138 {
1139         struct kvaser_usb_net_priv *priv;
1140         struct can_frame *cf;
1141         struct sk_buff *skb;
1142         struct net_device_stats *stats;
1143         u8 channel = msg->u.rx_can_header.channel;
1144         const u8 *rx_msg = NULL;        /* GCC */
1145
1146         if (channel >= dev->nchannels) {
1147                 dev_err(dev->udev->dev.parent,
1148                         "Invalid channel number (%d)\n", channel);
1149                 return;
1150         }
1151
1152         priv = dev->nets[channel];
1153         stats = &priv->netdev->stats;
1154
1155         if ((msg->u.rx_can_header.flag & MSG_FLAG_ERROR_FRAME) &&
1156             (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE)) {
1157                 kvaser_leaf_rx_error(dev, msg);
1158                 return;
1159         } else if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1160                                                 MSG_FLAG_NERR |
1161                                                 MSG_FLAG_OVERRUN)) {
1162                 kvaser_usb_rx_can_err(priv, msg);
1163                 return;
1164         } else if (msg->u.rx_can_header.flag & ~MSG_FLAG_REMOTE_FRAME) {
1165                 netdev_warn(priv->netdev,
1166                             "Unhandled frame (flags: 0x%02x)",
1167                             msg->u.rx_can_header.flag);
1168                 return;
1169         }
1170
1171         switch (dev->family) {
1172         case KVASER_LEAF:
1173                 rx_msg = msg->u.leaf.rx_can.msg;
1174                 break;
1175         case KVASER_USBCAN:
1176                 rx_msg = msg->u.usbcan.rx_can.msg;
1177                 break;
1178         }
1179
1180         skb = alloc_can_skb(priv->netdev, &cf);
1181         if (!skb) {
1182                 stats->tx_dropped++;
1183                 return;
1184         }
1185
1186         if (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE) {
1187                 cf->can_id = le32_to_cpu(msg->u.leaf.log_message.id);
1188                 if (cf->can_id & KVASER_EXTENDED_FRAME)
1189                         cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
1190                 else
1191                         cf->can_id &= CAN_SFF_MASK;
1192
1193                 cf->can_dlc = get_can_dlc(msg->u.leaf.log_message.dlc);
1194
1195                 if (msg->u.leaf.log_message.flags & MSG_FLAG_REMOTE_FRAME)
1196                         cf->can_id |= CAN_RTR_FLAG;
1197                 else
1198                         memcpy(cf->data, &msg->u.leaf.log_message.data,
1199                                cf->can_dlc);
1200         } else {
1201                 cf->can_id = ((rx_msg[0] & 0x1f) << 6) | (rx_msg[1] & 0x3f);
1202
1203                 if (msg->id == CMD_RX_EXT_MESSAGE) {
1204                         cf->can_id <<= 18;
1205                         cf->can_id |= ((rx_msg[2] & 0x0f) << 14) |
1206                                       ((rx_msg[3] & 0xff) << 6) |
1207                                       (rx_msg[4] & 0x3f);
1208                         cf->can_id |= CAN_EFF_FLAG;
1209                 }
1210
1211                 cf->can_dlc = get_can_dlc(rx_msg[5]);
1212
1213                 if (msg->u.rx_can_header.flag & MSG_FLAG_REMOTE_FRAME)
1214                         cf->can_id |= CAN_RTR_FLAG;
1215                 else
1216                         memcpy(cf->data, &rx_msg[6],
1217                                cf->can_dlc);
1218         }
1219
1220         stats->rx_packets++;
1221         stats->rx_bytes += cf->can_dlc;
1222         netif_rx(skb);
1223 }
1224
1225 static void kvaser_usb_start_chip_reply(const struct kvaser_usb *dev,
1226                                         const struct kvaser_msg *msg)
1227 {
1228         struct kvaser_usb_net_priv *priv;
1229         u8 channel = msg->u.simple.channel;
1230
1231         if (channel >= dev->nchannels) {
1232                 dev_err(dev->udev->dev.parent,
1233                         "Invalid channel number (%d)\n", channel);
1234                 return;
1235         }
1236
1237         priv = dev->nets[channel];
1238
1239         if (completion_done(&priv->start_comp) &&
1240             netif_queue_stopped(priv->netdev)) {
1241                 netif_wake_queue(priv->netdev);
1242         } else {
1243                 netif_start_queue(priv->netdev);
1244                 complete(&priv->start_comp);
1245         }
1246 }
1247
1248 static void kvaser_usb_stop_chip_reply(const struct kvaser_usb *dev,
1249                                        const struct kvaser_msg *msg)
1250 {
1251         struct kvaser_usb_net_priv *priv;
1252         u8 channel = msg->u.simple.channel;
1253
1254         if (channel >= dev->nchannels) {
1255                 dev_err(dev->udev->dev.parent,
1256                         "Invalid channel number (%d)\n", channel);
1257                 return;
1258         }
1259
1260         priv = dev->nets[channel];
1261
1262         complete(&priv->stop_comp);
1263 }
1264
1265 static void kvaser_usb_handle_message(const struct kvaser_usb *dev,
1266                                       const struct kvaser_msg *msg)
1267 {
1268         switch (msg->id) {
1269         case CMD_START_CHIP_REPLY:
1270                 kvaser_usb_start_chip_reply(dev, msg);
1271                 break;
1272
1273         case CMD_STOP_CHIP_REPLY:
1274                 kvaser_usb_stop_chip_reply(dev, msg);
1275                 break;
1276
1277         case CMD_RX_STD_MESSAGE:
1278         case CMD_RX_EXT_MESSAGE:
1279                 kvaser_usb_rx_can_msg(dev, msg);
1280                 break;
1281
1282         case CMD_LEAF_LOG_MESSAGE:
1283                 if (dev->family != KVASER_LEAF)
1284                         goto warn;
1285                 kvaser_usb_rx_can_msg(dev, msg);
1286                 break;
1287
1288         case CMD_CHIP_STATE_EVENT:
1289         case CMD_CAN_ERROR_EVENT:
1290                 if (dev->family == KVASER_LEAF)
1291                         kvaser_leaf_rx_error(dev, msg);
1292                 else
1293                         kvaser_usbcan_rx_error(dev, msg);
1294                 break;
1295
1296         case CMD_TX_ACKNOWLEDGE:
1297                 kvaser_usb_tx_acknowledge(dev, msg);
1298                 break;
1299
1300         /* Ignored messages */
1301         case CMD_USBCAN_CLOCK_OVERFLOW_EVENT:
1302                 if (dev->family != KVASER_USBCAN)
1303                         goto warn;
1304                 break;
1305
1306         default:
1307 warn:           dev_warn(dev->udev->dev.parent,
1308                          "Unhandled message (%d)\n", msg->id);
1309                 break;
1310         }
1311 }
1312
1313 static void kvaser_usb_read_bulk_callback(struct urb *urb)
1314 {
1315         struct kvaser_usb *dev = urb->context;
1316         struct kvaser_msg *msg;
1317         int pos = 0;
1318         int err, i;
1319
1320         switch (urb->status) {
1321         case 0:
1322                 break;
1323         case -ENOENT:
1324         case -ESHUTDOWN:
1325                 return;
1326         default:
1327                 dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n",
1328                          urb->status);
1329                 goto resubmit_urb;
1330         }
1331
1332         while (pos <= urb->actual_length - MSG_HEADER_LEN) {
1333                 msg = urb->transfer_buffer + pos;
1334
1335                 /* The Kvaser firmware can only read and write messages that
1336                  * does not cross the USB's endpoint wMaxPacketSize boundary.
1337                  * If a follow-up command crosses such boundary, firmware puts
1338                  * a placeholder zero-length command in its place then aligns
1339                  * the real command to the next max packet size.
1340                  *
1341                  * Handle such cases or we're going to miss a significant
1342                  * number of events in case of a heavy rx load on the bus.
1343                  */
1344                 if (msg->len == 0) {
1345                         pos = round_up(pos, le16_to_cpu(dev->bulk_in->
1346                                                         wMaxPacketSize));
1347                         continue;
1348                 }
1349
1350                 if (pos + msg->len > urb->actual_length) {
1351                         dev_err(dev->udev->dev.parent, "Format error\n");
1352                         break;
1353                 }
1354
1355                 kvaser_usb_handle_message(dev, msg);
1356                 pos += msg->len;
1357         }
1358
1359 resubmit_urb:
1360         usb_fill_bulk_urb(urb, dev->udev,
1361                           usb_rcvbulkpipe(dev->udev,
1362                                           dev->bulk_in->bEndpointAddress),
1363                           urb->transfer_buffer, RX_BUFFER_SIZE,
1364                           kvaser_usb_read_bulk_callback, dev);
1365
1366         err = usb_submit_urb(urb, GFP_ATOMIC);
1367         if (err == -ENODEV) {
1368                 for (i = 0; i < dev->nchannels; i++) {
1369                         if (!dev->nets[i])
1370                                 continue;
1371
1372                         netif_device_detach(dev->nets[i]->netdev);
1373                 }
1374         } else if (err) {
1375                 dev_err(dev->udev->dev.parent,
1376                         "Failed resubmitting read bulk urb: %d\n", err);
1377         }
1378
1379         return;
1380 }
1381
1382 static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
1383 {
1384         int i, err = 0;
1385
1386         if (dev->rxinitdone)
1387                 return 0;
1388
1389         for (i = 0; i < MAX_RX_URBS; i++) {
1390                 struct urb *urb = NULL;
1391                 u8 *buf = NULL;
1392                 dma_addr_t buf_dma;
1393
1394                 urb = usb_alloc_urb(0, GFP_KERNEL);
1395                 if (!urb) {
1396                         dev_warn(dev->udev->dev.parent,
1397                                  "No memory left for URBs\n");
1398                         err = -ENOMEM;
1399                         break;
1400                 }
1401
1402                 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE,
1403                                          GFP_KERNEL, &buf_dma);
1404                 if (!buf) {
1405                         dev_warn(dev->udev->dev.parent,
1406                                  "No memory left for USB buffer\n");
1407                         usb_free_urb(urb);
1408                         err = -ENOMEM;
1409                         break;
1410                 }
1411
1412                 usb_fill_bulk_urb(urb, dev->udev,
1413                                   usb_rcvbulkpipe(dev->udev,
1414                                           dev->bulk_in->bEndpointAddress),
1415                                   buf, RX_BUFFER_SIZE,
1416                                   kvaser_usb_read_bulk_callback,
1417                                   dev);
1418                 urb->transfer_dma = buf_dma;
1419                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1420                 usb_anchor_urb(urb, &dev->rx_submitted);
1421
1422                 err = usb_submit_urb(urb, GFP_KERNEL);
1423                 if (err) {
1424                         usb_unanchor_urb(urb);
1425                         usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
1426                                           buf_dma);
1427                         usb_free_urb(urb);
1428                         break;
1429                 }
1430
1431                 dev->rxbuf[i] = buf;
1432                 dev->rxbuf_dma[i] = buf_dma;
1433
1434                 usb_free_urb(urb);
1435         }
1436
1437         if (i == 0) {
1438                 dev_warn(dev->udev->dev.parent,
1439                          "Cannot setup read URBs, error %d\n", err);
1440                 return err;
1441         } else if (i < MAX_RX_URBS) {
1442                 dev_warn(dev->udev->dev.parent,
1443                          "RX performances may be slow\n");
1444         }
1445
1446         dev->rxinitdone = true;
1447
1448         return 0;
1449 }
1450
1451 static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1452 {
1453         struct kvaser_msg *msg;
1454         int rc;
1455
1456         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1457         if (!msg)
1458                 return -ENOMEM;
1459
1460         msg->id = CMD_SET_CTRL_MODE;
1461         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_ctrl_mode);
1462         msg->u.ctrl_mode.tid = 0xff;
1463         msg->u.ctrl_mode.channel = priv->channel;
1464
1465         if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1466                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1467         else
1468                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1469
1470         rc = kvaser_usb_send_msg(priv->dev, msg);
1471
1472         kfree(msg);
1473         return rc;
1474 }
1475
1476 static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv)
1477 {
1478         int err;
1479
1480         init_completion(&priv->start_comp);
1481
1482         err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP,
1483                                          priv->channel);
1484         if (err)
1485                 return err;
1486
1487         if (!wait_for_completion_timeout(&priv->start_comp,
1488                                          msecs_to_jiffies(START_TIMEOUT)))
1489                 return -ETIMEDOUT;
1490
1491         return 0;
1492 }
1493
1494 static int kvaser_usb_open(struct net_device *netdev)
1495 {
1496         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1497         struct kvaser_usb *dev = priv->dev;
1498         int err;
1499
1500         err = open_candev(netdev);
1501         if (err)
1502                 return err;
1503
1504         err = kvaser_usb_setup_rx_urbs(dev);
1505         if (err)
1506                 goto error;
1507
1508         err = kvaser_usb_set_opt_mode(priv);
1509         if (err)
1510                 goto error;
1511
1512         err = kvaser_usb_start_chip(priv);
1513         if (err) {
1514                 netdev_warn(netdev, "Cannot start device, error %d\n", err);
1515                 goto error;
1516         }
1517
1518         priv->can.state = CAN_STATE_ERROR_ACTIVE;
1519
1520         return 0;
1521
1522 error:
1523         close_candev(netdev);
1524         return err;
1525 }
1526
1527 static void kvaser_usb_reset_tx_urb_contexts(struct kvaser_usb_net_priv *priv)
1528 {
1529         int i, max_tx_urbs;
1530
1531         max_tx_urbs = priv->dev->max_tx_urbs;
1532
1533         priv->active_tx_contexts = 0;
1534         for (i = 0; i < max_tx_urbs; i++)
1535                 priv->tx_contexts[i].echo_index = max_tx_urbs;
1536 }
1537
1538 /* This method might sleep. Do not call it in the atomic context
1539  * of URB completions.
1540  */
1541 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
1542 {
1543         usb_kill_anchored_urbs(&priv->tx_submitted);
1544         kvaser_usb_reset_tx_urb_contexts(priv);
1545 }
1546
1547 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
1548 {
1549         int i;
1550
1551         usb_kill_anchored_urbs(&dev->rx_submitted);
1552
1553         for (i = 0; i < MAX_RX_URBS; i++)
1554                 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
1555                                   dev->rxbuf[i],
1556                                   dev->rxbuf_dma[i]);
1557
1558         for (i = 0; i < dev->nchannels; i++) {
1559                 struct kvaser_usb_net_priv *priv = dev->nets[i];
1560
1561                 if (priv)
1562                         kvaser_usb_unlink_tx_urbs(priv);
1563         }
1564 }
1565
1566 static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv)
1567 {
1568         int err;
1569
1570         init_completion(&priv->stop_comp);
1571
1572         err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP,
1573                                          priv->channel);
1574         if (err)
1575                 return err;
1576
1577         if (!wait_for_completion_timeout(&priv->stop_comp,
1578                                          msecs_to_jiffies(STOP_TIMEOUT)))
1579                 return -ETIMEDOUT;
1580
1581         return 0;
1582 }
1583
1584 static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv)
1585 {
1586         struct kvaser_msg *msg;
1587         int rc;
1588
1589         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1590         if (!msg)
1591                 return -ENOMEM;
1592
1593         msg->id = CMD_FLUSH_QUEUE;
1594         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_flush_queue);
1595         msg->u.flush_queue.channel = priv->channel;
1596         msg->u.flush_queue.flags = 0x00;
1597
1598         rc = kvaser_usb_send_msg(priv->dev, msg);
1599
1600         kfree(msg);
1601         return rc;
1602 }
1603
1604 static int kvaser_usb_close(struct net_device *netdev)
1605 {
1606         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1607         struct kvaser_usb *dev = priv->dev;
1608         int err;
1609
1610         netif_stop_queue(netdev);
1611
1612         err = kvaser_usb_flush_queue(priv);
1613         if (err)
1614                 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
1615
1616         if (kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel))
1617                 netdev_warn(netdev, "Cannot reset card, error %d\n", err);
1618
1619         err = kvaser_usb_stop_chip(priv);
1620         if (err)
1621                 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
1622
1623         /* reset tx contexts */
1624         kvaser_usb_unlink_tx_urbs(priv);
1625
1626         priv->can.state = CAN_STATE_STOPPED;
1627         close_candev(priv->netdev);
1628
1629         return 0;
1630 }
1631
1632 static void kvaser_usb_write_bulk_callback(struct urb *urb)
1633 {
1634         struct kvaser_usb_tx_urb_context *context = urb->context;
1635         struct kvaser_usb_net_priv *priv;
1636         struct net_device *netdev;
1637
1638         if (WARN_ON(!context))
1639                 return;
1640
1641         priv = context->priv;
1642         netdev = priv->netdev;
1643
1644         kfree(urb->transfer_buffer);
1645
1646         if (!netif_device_present(netdev))
1647                 return;
1648
1649         if (urb->status)
1650                 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1651 }
1652
1653 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1654                                          struct net_device *netdev)
1655 {
1656         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1657         struct kvaser_usb *dev = priv->dev;
1658         struct net_device_stats *stats = &netdev->stats;
1659         struct can_frame *cf = (struct can_frame *)skb->data;
1660         struct kvaser_usb_tx_urb_context *context = NULL;
1661         struct urb *urb;
1662         void *buf;
1663         struct kvaser_msg *msg;
1664         int i, err, ret = NETDEV_TX_OK;
1665         u8 *msg_tx_can_flags = NULL;            /* GCC */
1666         unsigned long flags;
1667
1668         if (can_dropped_invalid_skb(netdev, skb))
1669                 return NETDEV_TX_OK;
1670
1671         urb = usb_alloc_urb(0, GFP_ATOMIC);
1672         if (!urb) {
1673                 netdev_err(netdev, "No memory left for URBs\n");
1674                 stats->tx_dropped++;
1675                 dev_kfree_skb(skb);
1676                 return NETDEV_TX_OK;
1677         }
1678
1679         buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1680         if (!buf) {
1681                 stats->tx_dropped++;
1682                 dev_kfree_skb(skb);
1683                 goto freeurb;
1684         }
1685
1686         msg = buf;
1687         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
1688         msg->u.tx_can.channel = priv->channel;
1689
1690         switch (dev->family) {
1691         case KVASER_LEAF:
1692                 msg_tx_can_flags = &msg->u.tx_can.leaf.flags;
1693                 break;
1694         case KVASER_USBCAN:
1695                 msg_tx_can_flags = &msg->u.tx_can.usbcan.flags;
1696                 break;
1697         }
1698
1699         *msg_tx_can_flags = 0;
1700
1701         if (cf->can_id & CAN_EFF_FLAG) {
1702                 msg->id = CMD_TX_EXT_MESSAGE;
1703                 msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
1704                 msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
1705                 msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
1706                 msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
1707                 msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
1708         } else {
1709                 msg->id = CMD_TX_STD_MESSAGE;
1710                 msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
1711                 msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
1712         }
1713
1714         msg->u.tx_can.msg[5] = cf->can_dlc;
1715         memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
1716
1717         if (cf->can_id & CAN_RTR_FLAG)
1718                 *msg_tx_can_flags |= MSG_FLAG_REMOTE_FRAME;
1719
1720         spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1721         for (i = 0; i < dev->max_tx_urbs; i++) {
1722                 if (priv->tx_contexts[i].echo_index == dev->max_tx_urbs) {
1723                         context = &priv->tx_contexts[i];
1724
1725                         context->echo_index = i;
1726                         can_put_echo_skb(skb, netdev, context->echo_index);
1727                         ++priv->active_tx_contexts;
1728                         if (priv->active_tx_contexts >= dev->max_tx_urbs)
1729                                 netif_stop_queue(netdev);
1730
1731                         break;
1732                 }
1733         }
1734         spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1735
1736         /* This should never happen; it implies a flow control bug */
1737         if (!context) {
1738                 netdev_warn(netdev, "cannot find free context\n");
1739
1740                 kfree(buf);
1741                 ret =  NETDEV_TX_BUSY;
1742                 goto freeurb;
1743         }
1744
1745         context->priv = priv;
1746         context->dlc = cf->can_dlc;
1747
1748         msg->u.tx_can.tid = context->echo_index;
1749
1750         usb_fill_bulk_urb(urb, dev->udev,
1751                           usb_sndbulkpipe(dev->udev,
1752                                           dev->bulk_out->bEndpointAddress),
1753                           buf, msg->len,
1754                           kvaser_usb_write_bulk_callback, context);
1755         usb_anchor_urb(urb, &priv->tx_submitted);
1756
1757         err = usb_submit_urb(urb, GFP_ATOMIC);
1758         if (unlikely(err)) {
1759                 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1760
1761                 can_free_echo_skb(netdev, context->echo_index);
1762                 context->echo_index = dev->max_tx_urbs;
1763                 --priv->active_tx_contexts;
1764                 netif_wake_queue(netdev);
1765
1766                 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1767
1768                 usb_unanchor_urb(urb);
1769
1770                 stats->tx_dropped++;
1771
1772                 if (err == -ENODEV)
1773                         netif_device_detach(netdev);
1774                 else
1775                         netdev_warn(netdev, "Failed tx_urb %d\n", err);
1776
1777                 goto freeurb;
1778         }
1779
1780         ret = NETDEV_TX_OK;
1781
1782 freeurb:
1783         usb_free_urb(urb);
1784         return ret;
1785 }
1786
1787 static const struct net_device_ops kvaser_usb_netdev_ops = {
1788         .ndo_open = kvaser_usb_open,
1789         .ndo_stop = kvaser_usb_close,
1790         .ndo_start_xmit = kvaser_usb_start_xmit,
1791         .ndo_change_mtu = can_change_mtu,
1792 };
1793
1794 static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1795         .name = "kvaser_usb",
1796         .tseg1_min = KVASER_USB_TSEG1_MIN,
1797         .tseg1_max = KVASER_USB_TSEG1_MAX,
1798         .tseg2_min = KVASER_USB_TSEG2_MIN,
1799         .tseg2_max = KVASER_USB_TSEG2_MAX,
1800         .sjw_max = KVASER_USB_SJW_MAX,
1801         .brp_min = KVASER_USB_BRP_MIN,
1802         .brp_max = KVASER_USB_BRP_MAX,
1803         .brp_inc = KVASER_USB_BRP_INC,
1804 };
1805
1806 static int kvaser_usb_set_bittiming(struct net_device *netdev)
1807 {
1808         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1809         struct can_bittiming *bt = &priv->can.bittiming;
1810         struct kvaser_usb *dev = priv->dev;
1811         struct kvaser_msg *msg;
1812         int rc;
1813
1814         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1815         if (!msg)
1816                 return -ENOMEM;
1817
1818         msg->id = CMD_SET_BUS_PARAMS;
1819         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1820         msg->u.busparams.channel = priv->channel;
1821         msg->u.busparams.tid = 0xff;
1822         msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1823         msg->u.busparams.sjw = bt->sjw;
1824         msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1825         msg->u.busparams.tseg2 = bt->phase_seg2;
1826
1827         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1828                 msg->u.busparams.no_samp = 3;
1829         else
1830                 msg->u.busparams.no_samp = 1;
1831
1832         rc = kvaser_usb_send_msg(dev, msg);
1833
1834         kfree(msg);
1835         return rc;
1836 }
1837
1838 static int kvaser_usb_set_mode(struct net_device *netdev,
1839                                enum can_mode mode)
1840 {
1841         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1842         int err;
1843
1844         switch (mode) {
1845         case CAN_MODE_START:
1846                 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1847                 if (err)
1848                         return err;
1849                 break;
1850         default:
1851                 return -EOPNOTSUPP;
1852         }
1853
1854         return 0;
1855 }
1856
1857 static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1858                                        struct can_berr_counter *bec)
1859 {
1860         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1861
1862         *bec = priv->bec;
1863
1864         return 0;
1865 }
1866
1867 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1868 {
1869         int i;
1870
1871         for (i = 0; i < dev->nchannels; i++) {
1872                 if (!dev->nets[i])
1873                         continue;
1874
1875                 unregister_candev(dev->nets[i]->netdev);
1876         }
1877
1878         kvaser_usb_unlink_all_urbs(dev);
1879
1880         for (i = 0; i < dev->nchannels; i++) {
1881                 if (!dev->nets[i])
1882                         continue;
1883
1884                 free_candev(dev->nets[i]->netdev);
1885         }
1886 }
1887
1888 static int kvaser_usb_init_one(struct usb_interface *intf,
1889                                const struct usb_device_id *id, int channel)
1890 {
1891         struct kvaser_usb *dev = usb_get_intfdata(intf);
1892         struct net_device *netdev;
1893         struct kvaser_usb_net_priv *priv;
1894         int err;
1895
1896         err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, channel);
1897         if (err)
1898                 return err;
1899
1900         netdev = alloc_candev(sizeof(*priv) +
1901                               dev->max_tx_urbs * sizeof(*priv->tx_contexts),
1902                               dev->max_tx_urbs);
1903         if (!netdev) {
1904                 dev_err(&intf->dev, "Cannot alloc candev\n");
1905                 return -ENOMEM;
1906         }
1907
1908         priv = netdev_priv(netdev);
1909
1910         init_usb_anchor(&priv->tx_submitted);
1911         init_completion(&priv->start_comp);
1912         init_completion(&priv->stop_comp);
1913
1914         priv->dev = dev;
1915         priv->netdev = netdev;
1916         priv->channel = channel;
1917
1918         spin_lock_init(&priv->tx_contexts_lock);
1919         kvaser_usb_reset_tx_urb_contexts(priv);
1920
1921         priv->can.state = CAN_STATE_STOPPED;
1922         priv->can.clock.freq = CAN_USB_CLOCK;
1923         priv->can.bittiming_const = &kvaser_usb_bittiming_const;
1924         priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
1925         priv->can.do_set_mode = kvaser_usb_set_mode;
1926         if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
1927                 priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
1928         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
1929         if (id->driver_info & KVASER_HAS_SILENT_MODE)
1930                 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1931
1932         netdev->flags |= IFF_ECHO;
1933
1934         netdev->netdev_ops = &kvaser_usb_netdev_ops;
1935
1936         SET_NETDEV_DEV(netdev, &intf->dev);
1937         netdev->dev_id = channel;
1938
1939         dev->nets[channel] = priv;
1940
1941         err = register_candev(netdev);
1942         if (err) {
1943                 dev_err(&intf->dev, "Failed to register can device\n");
1944                 free_candev(netdev);
1945                 dev->nets[channel] = NULL;
1946                 return err;
1947         }
1948
1949         netdev_dbg(netdev, "device registered\n");
1950
1951         return 0;
1952 }
1953
1954 static int kvaser_usb_get_endpoints(const struct usb_interface *intf,
1955                                     struct usb_endpoint_descriptor **in,
1956                                     struct usb_endpoint_descriptor **out)
1957 {
1958         const struct usb_host_interface *iface_desc;
1959         struct usb_endpoint_descriptor *endpoint;
1960         int i;
1961
1962         iface_desc = &intf->altsetting[0];
1963
1964         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1965                 endpoint = &iface_desc->endpoint[i].desc;
1966
1967                 if (!*in && usb_endpoint_is_bulk_in(endpoint))
1968                         *in = endpoint;
1969
1970                 if (!*out && usb_endpoint_is_bulk_out(endpoint))
1971                         *out = endpoint;
1972
1973                 /* use first bulk endpoint for in and out */
1974                 if (*in && *out)
1975                         return 0;
1976         }
1977
1978         return -ENODEV;
1979 }
1980
1981 static int kvaser_usb_probe(struct usb_interface *intf,
1982                             const struct usb_device_id *id)
1983 {
1984         struct kvaser_usb *dev;
1985         int err = -ENOMEM;
1986         int i, retry = 3;
1987
1988         dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
1989         if (!dev)
1990                 return -ENOMEM;
1991
1992         if (kvaser_is_leaf(id)) {
1993                 dev->family = KVASER_LEAF;
1994         } else if (kvaser_is_usbcan(id)) {
1995                 dev->family = KVASER_USBCAN;
1996         } else {
1997                 dev_err(&intf->dev,
1998                         "Product ID (%d) does not belong to any known Kvaser USB family",
1999                         id->idProduct);
2000                 return -ENODEV;
2001         }
2002
2003         err = kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
2004         if (err) {
2005                 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
2006                 return err;
2007         }
2008
2009         dev->udev = interface_to_usbdev(intf);
2010
2011         init_usb_anchor(&dev->rx_submitted);
2012
2013         usb_set_intfdata(intf, dev);
2014
2015         /* On some x86 laptops, plugging a Kvaser device again after
2016          * an unplug makes the firmware always ignore the very first
2017          * command. For such a case, provide some room for retries
2018          * instead of completely exiting the driver.
2019          */
2020         do {
2021                 err = kvaser_usb_get_software_info(dev);
2022         } while (--retry && err == -ETIMEDOUT);
2023
2024         if (err) {
2025                 dev_err(&intf->dev,
2026                         "Cannot get software infos, error %d\n", err);
2027                 return err;
2028         }
2029
2030         dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
2031                 ((dev->fw_version >> 24) & 0xff),
2032                 ((dev->fw_version >> 16) & 0xff),
2033                 (dev->fw_version & 0xffff));
2034
2035         dev_dbg(&intf->dev, "Max oustanding tx = %d URBs\n", dev->max_tx_urbs);
2036
2037         err = kvaser_usb_get_card_info(dev);
2038         if (err) {
2039                 dev_err(&intf->dev,
2040                         "Cannot get card infos, error %d\n", err);
2041                 return err;
2042         }
2043
2044         for (i = 0; i < dev->nchannels; i++) {
2045                 err = kvaser_usb_init_one(intf, id, i);
2046                 if (err) {
2047                         kvaser_usb_remove_interfaces(dev);
2048                         return err;
2049                 }
2050         }
2051
2052         return 0;
2053 }
2054
2055 static void kvaser_usb_disconnect(struct usb_interface *intf)
2056 {
2057         struct kvaser_usb *dev = usb_get_intfdata(intf);
2058
2059         usb_set_intfdata(intf, NULL);
2060
2061         if (!dev)
2062                 return;
2063
2064         kvaser_usb_remove_interfaces(dev);
2065 }
2066
2067 static struct usb_driver kvaser_usb_driver = {
2068         .name = "kvaser_usb",
2069         .probe = kvaser_usb_probe,
2070         .disconnect = kvaser_usb_disconnect,
2071         .id_table = kvaser_usb_table,
2072 };
2073
2074 module_usb_driver(kvaser_usb_driver);
2075
2076 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
2077 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
2078 MODULE_LICENSE("GPL v2");