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 #define CMD_FLUSH_QUEUE_REPLY           68
 141
 142 #define CMD_LEAF_USB_THROTTLE           77
 143 #define CMD_LEAF_LOG_MESSAGE            106
 144
 145 /* error factors */
 146 #define M16C_EF_ACKE                    BIT(0)
 147 #define M16C_EF_CRCE                    BIT(1)
 148 #define M16C_EF_FORME                   BIT(2)
 149 #define M16C_EF_STFE                    BIT(3)
 150 #define M16C_EF_BITE0                   BIT(4)
 151 #define M16C_EF_BITE1                   BIT(5)
 152 #define M16C_EF_RCVE                    BIT(6)
 153 #define M16C_EF_TRE                     BIT(7)
 154
 155 /* Only Leaf-based devices can report M16C error factors,
 156  * thus define our own error status flags for USBCANII
 157  */
 158 #define USBCAN_ERROR_STATE_NONE         0
 159 #define USBCAN_ERROR_STATE_TX_ERROR     BIT(0)
 160 #define USBCAN_ERROR_STATE_RX_ERROR     BIT(1)
 161 #define USBCAN_ERROR_STATE_BUSERROR     BIT(2)
 162
 163 /* bittiming parameters */
 164 #define KVASER_USB_TSEG1_MIN            1
 165 #define KVASER_USB_TSEG1_MAX            16
 166 #define KVASER_USB_TSEG2_MIN            1
 167 #define KVASER_USB_TSEG2_MAX            8
 168 #define KVASER_USB_SJW_MAX              4
 169 #define KVASER_USB_BRP_MIN              1
 170 #define KVASER_USB_BRP_MAX              64
 171 #define KVASER_USB_BRP_INC              1
 172
 173 /* ctrl modes */
 174 #define KVASER_CTRL_MODE_NORMAL         1
 175 #define KVASER_CTRL_MODE_SILENT         2
 176 #define KVASER_CTRL_MODE_SELFRECEPTION  3
 177 #define KVASER_CTRL_MODE_OFF            4
 178
 179 /* Extended CAN identifier flag */
 180 #define KVASER_EXTENDED_FRAME           BIT(31)
 181
 182 /* Kvaser USB CAN dongles are divided into two major families:
 183  * - Leaf: Based on Renesas M32C, running firmware labeled as 'filo'
 184  * - UsbcanII: Based on Renesas M16C, running firmware labeled as 'helios'
 185  */
 186 enum kvaser_usb_family {
 187         KVASER_LEAF,
 188         KVASER_USBCAN,
 189 };
 190
 191 struct kvaser_msg_simple {
 192         u8 tid;
 193         u8 channel;
 194 } __packed;
 195
 196 struct kvaser_msg_cardinfo {
 197         u8 tid;
 198         u8 nchannels;
 199         union {
 200                 struct {
 201                         __le32 serial_number;
 202                         __le32 padding;
 203                 } __packed leaf0;
 204                 struct {
 205                         __le32 serial_number_low;
 206                         __le32 serial_number_high;
 207                 } __packed usbcan0;
 208         } __packed;
 209         __le32 clock_resolution;
 210         __le32 mfgdate;
 211         u8 ean[8];
 212         u8 hw_revision;
 213         union {
 214                 struct {
 215                         u8 usb_hs_mode;
 216                 } __packed leaf1;
 217                 struct {
 218                         u8 padding;
 219                 } __packed usbcan1;
 220         } __packed;
 221         __le16 padding;
 222 } __packed;
 223
 224 struct kvaser_msg_cardinfo2 {
 225         u8 tid;
 226         u8 reserved;
 227         u8 pcb_id[24];
 228         __le32 oem_unlock_code;
 229 } __packed;
 230
 231 struct leaf_msg_softinfo {
 232         u8 tid;
 233         u8 padding0;
 234         __le32 sw_options;
 235         __le32 fw_version;
 236         __le16 max_outstanding_tx;
 237         __le16 padding1[9];
 238 } __packed;
 239
 240 struct usbcan_msg_softinfo {
 241         u8 tid;
 242         u8 fw_name[5];
 243         __le16 max_outstanding_tx;
 244         u8 padding[6];
 245         __le32 fw_version;
 246         __le16 checksum;
 247         __le16 sw_options;
 248 } __packed;
 249
 250 struct kvaser_msg_busparams {
 251         u8 tid;
 252         u8 channel;
 253         __le32 bitrate;
 254         u8 tseg1;
 255         u8 tseg2;
 256         u8 sjw;
 257         u8 no_samp;
 258 } __packed;
 259
 260 struct kvaser_msg_tx_can {
 261         u8 channel;
 262         u8 tid;
 263         u8 msg[14];
 264         union {
 265                 struct {
 266                         u8 padding;
 267                         u8 flags;
 268                 } __packed leaf;
 269                 struct {
 270                         u8 flags;
 271                         u8 padding;
 272                 } __packed usbcan;
 273         } __packed;
 274 } __packed;
 275
 276 struct kvaser_msg_rx_can_header {
 277         u8 channel;
 278         u8 flag;
 279 } __packed;
 280
 281 struct leaf_msg_rx_can {
 282         u8 channel;
 283         u8 flag;
 284
 285         __le16 time[3];
 286         u8 msg[14];
 287 } __packed;
 288
 289 struct usbcan_msg_rx_can {
 290         u8 channel;
 291         u8 flag;
 292
 293         u8 msg[14];
 294         __le16 time;
 295 } __packed;
 296
 297 struct leaf_msg_chip_state_event {
 298         u8 tid;
 299         u8 channel;
 300
 301         __le16 time[3];
 302         u8 tx_errors_count;
 303         u8 rx_errors_count;
 304
 305         u8 status;
 306         u8 padding[3];
 307 } __packed;
 308
 309 struct usbcan_msg_chip_state_event {
 310         u8 tid;
 311         u8 channel;
 312
 313         u8 tx_errors_count;
 314         u8 rx_errors_count;
 315         __le16 time;
 316
 317         u8 status;
 318         u8 padding[3];
 319 } __packed;
 320
 321 struct kvaser_msg_tx_acknowledge_header {
 322         u8 channel;
 323         u8 tid;
 324 } __packed;
 325
 326 struct leaf_msg_tx_acknowledge {
 327         u8 channel;
 328         u8 tid;
 329
 330         __le16 time[3];
 331         u8 flags;
 332         u8 time_offset;
 333 } __packed;
 334
 335 struct usbcan_msg_tx_acknowledge {
 336         u8 channel;
 337         u8 tid;
 338
 339         __le16 time;
 340         __le16 padding;
 341 } __packed;
 342
 343 struct leaf_msg_error_event {
 344         u8 tid;
 345         u8 flags;
 346         __le16 time[3];
 347         u8 channel;
 348         u8 padding;
 349         u8 tx_errors_count;
 350         u8 rx_errors_count;
 351         u8 status;
 352         u8 error_factor;
 353 } __packed;
 354
 355 struct usbcan_msg_error_event {
 356         u8 tid;
 357         u8 padding;
 358         u8 tx_errors_count_ch0;
 359         u8 rx_errors_count_ch0;
 360         u8 tx_errors_count_ch1;
 361         u8 rx_errors_count_ch1;
 362         u8 status_ch0;
 363         u8 status_ch1;
 364         __le16 time;
 365 } __packed;
 366
 367 struct kvaser_msg_ctrl_mode {
 368         u8 tid;
 369         u8 channel;
 370         u8 ctrl_mode;
 371         u8 padding[3];
 372 } __packed;
 373
 374 struct kvaser_msg_flush_queue {
 375         u8 tid;
 376         u8 channel;
 377         u8 flags;
 378         u8 padding[3];
 379 } __packed;
 380
 381 struct leaf_msg_log_message {
 382         u8 channel;
 383         u8 flags;
 384         __le16 time[3];
 385         u8 dlc;
 386         u8 time_offset;
 387         __le32 id;
 388         u8 data[8];
 389 } __packed;
 390
 391 struct kvaser_msg {
 392         u8 len;
 393         u8 id;
 394         union   {
 395                 struct kvaser_msg_simple simple;
 396                 struct kvaser_msg_cardinfo cardinfo;
 397                 struct kvaser_msg_cardinfo2 cardinfo2;
 398                 struct kvaser_msg_busparams busparams;
 399
 400                 struct kvaser_msg_rx_can_header rx_can_header;
 401                 struct kvaser_msg_tx_acknowledge_header tx_acknowledge_header;
 402
 403                 union {
 404                         struct leaf_msg_softinfo softinfo;
 405                         struct leaf_msg_rx_can rx_can;
 406                         struct leaf_msg_chip_state_event chip_state_event;
 407                         struct leaf_msg_tx_acknowledge tx_acknowledge;
 408                         struct leaf_msg_error_event error_event;
 409                         struct leaf_msg_log_message log_message;
 410                 } __packed leaf;
 411
 412                 union {
 413                         struct usbcan_msg_softinfo softinfo;
 414                         struct usbcan_msg_rx_can rx_can;
 415                         struct usbcan_msg_chip_state_event chip_state_event;
 416                         struct usbcan_msg_tx_acknowledge tx_acknowledge;
 417                         struct usbcan_msg_error_event error_event;
 418                 } __packed usbcan;
 419
 420                 struct kvaser_msg_tx_can tx_can;
 421                 struct kvaser_msg_ctrl_mode ctrl_mode;
 422                 struct kvaser_msg_flush_queue flush_queue;
 423         } u;
 424 } __packed;
 425
 426 /* Summary of a kvaser error event, for a unified Leaf/Usbcan error
 427  * handling. Some discrepancies between the two families exist:
 428  *
 429  * - USBCAN firmware does not report M16C "error factors"
 430  * - USBCAN controllers has difficulties reporting if the raised error
 431  *   event is for ch0 or ch1. They leave such arbitration to the OS
 432  *   driver by letting it compare error counters with previous values
 433  *   and decide the error event's channel. Thus for USBCAN, the channel
 434  *   field is only advisory.
 435  */
 436 struct kvaser_usb_error_summary {
 437         u8 channel, status, txerr, rxerr;
 438         union {
 439                 struct {
 440                         u8 error_factor;
 441                 } leaf;
 442                 struct {
 443                         u8 other_ch_status;
 444                         u8 error_state;
 445                 } usbcan;
 446         };
 447 };
 448
 449 /* Context for an outstanding, not yet ACKed, transmission */
 450 struct kvaser_usb_tx_urb_context {
 451         struct kvaser_usb_net_priv *priv;
 452         u32 echo_index;
 453         int dlc;
 454 };
 455
 456 struct kvaser_usb {
 457         struct usb_device *udev;
 458         struct kvaser_usb_net_priv *nets[MAX_NET_DEVICES];
 459
 460         struct usb_endpoint_descriptor *bulk_in, *bulk_out;
 461         struct usb_anchor rx_submitted;
 462
 463         /* @max_tx_urbs: Firmware-reported maximum number of outstanding,
 464          * not yet ACKed, transmissions on this device. This value is
 465          * also used as a sentinel for marking free tx contexts.
 466          */
 467         u32 fw_version;
 468         unsigned int nchannels;
 469         unsigned int max_tx_urbs;
 470         enum kvaser_usb_family family;
 471
 472         bool rxinitdone;
 473         void *rxbuf[MAX_RX_URBS];
 474         dma_addr_t rxbuf_dma[MAX_RX_URBS];
 475 };
 476
 477 struct kvaser_usb_net_priv {
 478         struct can_priv can;
 479         struct can_berr_counter bec;
 480
 481         struct kvaser_usb *dev;
 482         struct net_device *netdev;
 483         int channel;
 484
 485         struct completion start_comp, stop_comp;
 486         struct usb_anchor tx_submitted;
 487
 488         spinlock_t tx_contexts_lock;
 489         int active_tx_contexts;
 490         struct kvaser_usb_tx_urb_context tx_contexts[];
 491 };
 492
 493 static const struct usb_device_id kvaser_usb_table[] = {
 494         /* Leaf family IDs */
 495         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
 496         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
 497         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
 498                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 499                                KVASER_HAS_SILENT_MODE },
 500         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
 501                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 502                                KVASER_HAS_SILENT_MODE },
 503         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
 504                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 505                                KVASER_HAS_SILENT_MODE },
 506         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
 507                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 508                                KVASER_HAS_SILENT_MODE },
 509         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
 510                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 511                                KVASER_HAS_SILENT_MODE },
 512         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
 513                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 514                                KVASER_HAS_SILENT_MODE },
 515         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
 516                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 517                                KVASER_HAS_SILENT_MODE },
 518         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
 519                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 520                                KVASER_HAS_SILENT_MODE },
 521         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
 522                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 523                                KVASER_HAS_SILENT_MODE },
 524         { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
 525                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 526         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
 527         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
 528                 .driver_info = KVASER_HAS_TXRX_ERRORS |
 529                                KVASER_HAS_SILENT_MODE },
 530         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
 531                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 532         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
 533                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 534         { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
 535                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 536         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
 537                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 538         { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
 539                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 540         { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
 541                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 542         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID) },
 543         { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID) },
 544         { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID) },
 545         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_LIGHT_2HS_PRODUCT_ID) },
 546         { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_2HS_PRODUCT_ID) },
 547
 548         /* USBCANII family IDs */
 549         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN2_PRODUCT_ID),
 550                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 551         { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_REVB_PRODUCT_ID),
 552                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 553         { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMORATOR_PRODUCT_ID),
 554                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 555         { USB_DEVICE(KVASER_VENDOR_ID, USB_VCI2_PRODUCT_ID),
 556                 .driver_info = KVASER_HAS_TXRX_ERRORS },
 557
 558         { }
 559 };
 560 MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
 561
 562 static inline int kvaser_usb_send_msg(const struct kvaser_usb *dev,
 563                                       struct kvaser_msg *msg)
 564 {
 565         int actual_len;
 566
 567         return usb_bulk_msg(dev->udev,
 568                             usb_sndbulkpipe(dev->udev,
 569                                         dev->bulk_out->bEndpointAddress),
 570                             msg, msg->len, &actual_len,
 571                             USB_SEND_TIMEOUT);
 572 }
 573
 574 static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id,
 575                                struct kvaser_msg *msg)
 576 {
 577         struct kvaser_msg *tmp;
 578         void *buf;
 579         int actual_len;
 580         int err;
 581         int pos;
 582         unsigned long to = jiffies + msecs_to_jiffies(USB_RECV_TIMEOUT);
 583
 584         buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL);
 585         if (!buf)
 586                 return -ENOMEM;
 587
 588         do {
 589                 err = usb_bulk_msg(dev->udev,
 590                                    usb_rcvbulkpipe(dev->udev,
 591                                         dev->bulk_in->bEndpointAddress),
 592                                    buf, RX_BUFFER_SIZE, &actual_len,
 593                                    USB_RECV_TIMEOUT);
 594                 if (err < 0)
 595                         goto end;
 596
 597                 pos = 0;
 598                 while (pos <= actual_len - MSG_HEADER_LEN) {
 599                         tmp = buf + pos;
 600
 601                         /* Handle messages crossing the USB endpoint max packet
 602                          * size boundary. Check kvaser_usb_read_bulk_callback()
 603                          * for further details.
 604                          */
 605                         if (tmp->len == 0) {
 606                                 pos = round_up(pos, le16_to_cpu(dev->bulk_in->
 607                                                                 wMaxPacketSize));
 608                                 continue;
 609                         }
 610
 611                         if (pos + tmp->len > actual_len) {
 612                                 dev_err(dev->udev->dev.parent,
 613                                         "Format error\n");
 614                                 break;
 615                         }
 616
 617                         if (tmp->id == id) {
 618                                 memcpy(msg, tmp, tmp->len);
 619                                 goto end;
 620                         }
 621
 622                         pos += tmp->len;
 623                 }
 624         } while (time_before(jiffies, to));
 625
 626         err = -EINVAL;
 627
 628 end:
 629         kfree(buf);
 630
 631         return err;
 632 }
 633
 634 static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev,
 635                                       u8 msg_id, int channel)
 636 {
 637         struct kvaser_msg *msg;
 638         int rc;
 639
 640         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
 641         if (!msg)
 642                 return -ENOMEM;
 643
 644         msg->id = msg_id;
 645         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 646         msg->u.simple.channel = channel;
 647         msg->u.simple.tid = 0xff;
 648
 649         rc = kvaser_usb_send_msg(dev, msg);
 650
 651         kfree(msg);
 652         return rc;
 653 }
 654
 655 static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
 656 {
 657         struct kvaser_msg msg;
 658         int err;
 659
 660         err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0);
 661         if (err)
 662                 return err;
 663
 664         err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg);
 665         if (err)
 666                 return err;
 667
 668         switch (dev->family) {
 669         case KVASER_LEAF:
 670                 dev->fw_version = le32_to_cpu(msg.u.leaf.softinfo.fw_version);
 671                 dev->max_tx_urbs =
 672                         le16_to_cpu(msg.u.leaf.softinfo.max_outstanding_tx);
 673                 break;
 674         case KVASER_USBCAN:
 675                 dev->fw_version = le32_to_cpu(msg.u.usbcan.softinfo.fw_version);
 676                 dev->max_tx_urbs =
 677                         le16_to_cpu(msg.u.usbcan.softinfo.max_outstanding_tx);
 678                 break;
 679         }
 680
 681         return 0;
 682 }
 683
 684 static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
 685 {
 686         struct kvaser_msg msg;
 687         int err;
 688
 689         err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0);
 690         if (err)
 691                 return err;
 692
 693         err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg);
 694         if (err)
 695                 return err;
 696
 697         dev->nchannels = msg.u.cardinfo.nchannels;
 698         if ((dev->nchannels > MAX_NET_DEVICES) ||
 699             (dev->family == KVASER_USBCAN &&
 700              dev->nchannels > MAX_USBCAN_NET_DEVICES))
 701                 return -EINVAL;
 702
 703         return 0;
 704 }
 705
 706 static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
 707                                       const struct kvaser_msg *msg)
 708 {
 709         struct net_device_stats *stats;
 710         struct kvaser_usb_tx_urb_context *context;
 711         struct kvaser_usb_net_priv *priv;
 712         struct sk_buff *skb;
 713         struct can_frame *cf;
 714         unsigned long flags;
 715         u8 channel, tid;
 716
 717         channel = msg->u.tx_acknowledge_header.channel;
 718         tid = msg->u.tx_acknowledge_header.tid;
 719
 720         if (channel >= dev->nchannels) {
 721                 dev_err(dev->udev->dev.parent,
 722                         "Invalid channel number (%d)\n", channel);
 723                 return;
 724         }
 725
 726         priv = dev->nets[channel];
 727
 728         if (!netif_device_present(priv->netdev))
 729                 return;
 730
 731         stats = &priv->netdev->stats;
 732
 733         context = &priv->tx_contexts[tid % dev->max_tx_urbs];
 734
 735         /* Sometimes the state change doesn't come after a bus-off event */
 736         if (priv->can.restart_ms &&
 737             (priv->can.state >= CAN_STATE_BUS_OFF)) {
 738                 skb = alloc_can_err_skb(priv->netdev, &cf);
 739                 if (skb) {
 740                         cf->can_id |= CAN_ERR_RESTARTED;
 741
 742                         stats->rx_packets++;
 743                         stats->rx_bytes += cf->can_dlc;
 744                         netif_rx(skb);
 745                 } else {
 746                         netdev_err(priv->netdev,
 747                                    "No memory left for err_skb\n");
 748                 }
 749
 750                 priv->can.can_stats.restarts++;
 751                 netif_carrier_on(priv->netdev);
 752
 753                 priv->can.state = CAN_STATE_ERROR_ACTIVE;
 754         }
 755
 756         stats->tx_packets++;
 757         stats->tx_bytes += context->dlc;
 758
 759         spin_lock_irqsave(&priv->tx_contexts_lock, flags);
 760
 761         can_get_echo_skb(priv->netdev, context->echo_index);
 762         context->echo_index = dev->max_tx_urbs;
 763         --priv->active_tx_contexts;
 764         netif_wake_queue(priv->netdev);
 765
 766         spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
 767 }
 768
 769 static void kvaser_usb_simple_msg_callback(struct urb *urb)
 770 {
 771         struct net_device *netdev = urb->context;
 772
 773         kfree(urb->transfer_buffer);
 774
 775         if (urb->status)
 776                 netdev_warn(netdev, "urb status received: %d\n",
 777                             urb->status);
 778 }
 779
 780 static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
 781                                        u8 msg_id)
 782 {
 783         struct kvaser_usb *dev = priv->dev;
 784         struct net_device *netdev = priv->netdev;
 785         struct kvaser_msg *msg;
 786         struct urb *urb;
 787         void *buf;
 788         int err;
 789
 790         urb = usb_alloc_urb(0, GFP_ATOMIC);
 791         if (!urb)
 792                 return -ENOMEM;
 793
 794         buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
 795         if (!buf) {
 796                 usb_free_urb(urb);
 797                 return -ENOMEM;
 798         }
 799
 800         msg = (struct kvaser_msg *)buf;
 801         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
 802         msg->id = msg_id;
 803         msg->u.simple.channel = priv->channel;
 804
 805         usb_fill_bulk_urb(urb, dev->udev,
 806                           usb_sndbulkpipe(dev->udev,
 807                                           dev->bulk_out->bEndpointAddress),
 808                           buf, msg->len,
 809                           kvaser_usb_simple_msg_callback, netdev);
 810         usb_anchor_urb(urb, &priv->tx_submitted);
 811
 812         err = usb_submit_urb(urb, GFP_ATOMIC);
 813         if (err) {
 814                 netdev_err(netdev, "Error transmitting URB\n");
 815                 usb_unanchor_urb(urb);
 816                 usb_free_urb(urb);
 817                 return err;
 818         }
 819
 820         usb_free_urb(urb);
 821
 822         return 0;
 823 }
 824
 825 static void kvaser_usb_rx_error_update_can_state(struct kvaser_usb_net_priv *priv,
 826                                                  const struct kvaser_usb_error_summary *es,
 827                                                  struct can_frame *cf)
 828 {
 829         struct kvaser_usb *dev = priv->dev;
 830         struct net_device_stats *stats = &priv->netdev->stats;
 831         enum can_state cur_state, new_state, tx_state, rx_state;
 832
 833         netdev_dbg(priv->netdev, "Error status: 0x%02x\n", es->status);
 834
 835         new_state = cur_state = priv->can.state;
 836
 837         if (es->status & (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET))
 838                 new_state = CAN_STATE_BUS_OFF;
 839         else if (es->status & M16C_STATE_BUS_PASSIVE)
 840                 new_state = CAN_STATE_ERROR_PASSIVE;
 841         else if (es->status & M16C_STATE_BUS_ERROR) {
 842                 /* Guard against spurious error events after a busoff */
 843                 if (cur_state < CAN_STATE_BUS_OFF) {
 844                         if ((es->txerr >= 128) || (es->rxerr >= 128))
 845                                 new_state = CAN_STATE_ERROR_PASSIVE;
 846                         else if ((es->txerr >= 96) || (es->rxerr >= 96))
 847                                 new_state = CAN_STATE_ERROR_WARNING;
 848                         else if (cur_state > CAN_STATE_ERROR_ACTIVE)
 849                                 new_state = CAN_STATE_ERROR_ACTIVE;
 850                 }
 851         }
 852
 853         if (!es->status)
 854                 new_state = CAN_STATE_ERROR_ACTIVE;
 855
 856         if (new_state != cur_state) {
 857                 tx_state = (es->txerr >= es->rxerr) ? new_state : 0;
 858                 rx_state = (es->txerr <= es->rxerr) ? new_state : 0;
 859
 860                 can_change_state(priv->netdev, cf, tx_state, rx_state);
 861         }
 862
 863         if (priv->can.restart_ms &&
 864             (cur_state >= CAN_STATE_BUS_OFF) &&
 865             (new_state < CAN_STATE_BUS_OFF)) {
 866                 priv->can.can_stats.restarts++;
 867         }
 868
 869         switch (dev->family) {
 870         case KVASER_LEAF:
 871                 if (es->leaf.error_factor) {
 872                         priv->can.can_stats.bus_error++;
 873                         stats->rx_errors++;
 874                 }
 875                 break;
 876         case KVASER_USBCAN:
 877                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_TX_ERROR)
 878                         stats->tx_errors++;
 879                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_RX_ERROR)
 880                         stats->rx_errors++;
 881                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
 882                         priv->can.can_stats.bus_error++;
 883                 }
 884                 break;
 885         }
 886
 887         priv->bec.txerr = es->txerr;
 888         priv->bec.rxerr = es->rxerr;
 889 }
 890
 891 static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
 892                                 const struct kvaser_usb_error_summary *es)
 893 {
 894         struct can_frame *cf, tmp_cf = { .can_id = CAN_ERR_FLAG, .can_dlc = CAN_ERR_DLC };
 895         struct sk_buff *skb;
 896         struct net_device_stats *stats;
 897         struct kvaser_usb_net_priv *priv;
 898         enum can_state old_state, new_state;
 899
 900         if (es->channel >= dev->nchannels) {
 901                 dev_err(dev->udev->dev.parent,
 902                         "Invalid channel number (%d)\n", es->channel);
 903                 return;
 904         }
 905
 906         priv = dev->nets[es->channel];
 907         stats = &priv->netdev->stats;
 908
 909         /* Update all of the can interface's state and error counters before
 910          * trying any memory allocation that can actually fail with -ENOMEM.
 911          *
 912          * We send a temporary stack-allocated error can frame to
 913          * can_change_state() for the very same reason.
 914          *
 915          * TODO: Split can_change_state() responsibility between updating the
 916          * can interface's state and counters, and the setting up of can error
 917          * frame ID and data to userspace. Remove stack allocation afterwards.
 918          */
 919         old_state = priv->can.state;
 920         kvaser_usb_rx_error_update_can_state(priv, es, &tmp_cf);
 921         new_state = priv->can.state;
 922
 923         skb = alloc_can_err_skb(priv->netdev, &cf);
 924         if (!skb) {
 925                 stats->rx_dropped++;
 926                 return;
 927         }
 928         memcpy(cf, &tmp_cf, sizeof(*cf));
 929
 930         if (new_state != old_state) {
 931                 if (es->status &
 932                     (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) {
 933                         if (!priv->can.restart_ms)
 934                                 kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP);
 935                         netif_carrier_off(priv->netdev);
 936                 }
 937
 938                 if (priv->can.restart_ms &&
 939                     (old_state >= CAN_STATE_BUS_OFF) &&
 940                     (new_state < CAN_STATE_BUS_OFF)) {
 941                         cf->can_id |= CAN_ERR_RESTARTED;
 942                         netif_carrier_on(priv->netdev);
 943                 }
 944         }
 945
 946         switch (dev->family) {
 947         case KVASER_LEAF:
 948                 if (es->leaf.error_factor) {
 949                         cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
 950
 951                         if (es->leaf.error_factor & M16C_EF_ACKE)
 952                                 cf->data[3] = CAN_ERR_PROT_LOC_ACK;
 953                         if (es->leaf.error_factor & M16C_EF_CRCE)
 954                                 cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
 955                         if (es->leaf.error_factor & M16C_EF_FORME)
 956                                 cf->data[2] |= CAN_ERR_PROT_FORM;
 957                         if (es->leaf.error_factor & M16C_EF_STFE)
 958                                 cf->data[2] |= CAN_ERR_PROT_STUFF;
 959                         if (es->leaf.error_factor & M16C_EF_BITE0)
 960                                 cf->data[2] |= CAN_ERR_PROT_BIT0;
 961                         if (es->leaf.error_factor & M16C_EF_BITE1)
 962                                 cf->data[2] |= CAN_ERR_PROT_BIT1;
 963                         if (es->leaf.error_factor & M16C_EF_TRE)
 964                                 cf->data[2] |= CAN_ERR_PROT_TX;
 965                 }
 966                 break;
 967         case KVASER_USBCAN:
 968                 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
 969                         cf->can_id |= CAN_ERR_BUSERROR;
 970                 }
 971                 break;
 972         }
 973
 974         cf->data[6] = es->txerr;
 975         cf->data[7] = es->rxerr;
 976
 977         stats->rx_packets++;
 978         stats->rx_bytes += cf->can_dlc;
 979         netif_rx(skb);
 980 }
 981
 982 /* For USBCAN, report error to userspace iff the channels's errors counter
 983  * has changed, or we're the only channel seeing a bus error state.
 984  */
 985 static void kvaser_usbcan_conditionally_rx_error(const struct kvaser_usb *dev,
 986                                                  struct kvaser_usb_error_summary *es)
 987 {
 988         struct kvaser_usb_net_priv *priv;
 989         int channel;
 990         bool report_error;
 991
 992         channel = es->channel;
 993         if (channel >= dev->nchannels) {
 994                 dev_err(dev->udev->dev.parent,
 995                         "Invalid channel number (%d)\n", channel);
 996                 return;
 997         }
 998
 999         priv = dev->nets[channel];
1000         report_error = false;
1001
1002         if (es->txerr != priv->bec.txerr) {
1003                 es->usbcan.error_state |= USBCAN_ERROR_STATE_TX_ERROR;
1004                 report_error = true;
1005         }
1006         if (es->rxerr != priv->bec.rxerr) {
1007                 es->usbcan.error_state |= USBCAN_ERROR_STATE_RX_ERROR;
1008                 report_error = true;
1009         }
1010         if ((es->status & M16C_STATE_BUS_ERROR) &&
1011             !(es->usbcan.other_ch_status & M16C_STATE_BUS_ERROR)) {
1012                 es->usbcan.error_state |= USBCAN_ERROR_STATE_BUSERROR;
1013                 report_error = true;
1014         }
1015
1016         if (report_error)
1017                 kvaser_usb_rx_error(dev, es);
1018 }
1019
1020 static void kvaser_usbcan_rx_error(const struct kvaser_usb *dev,
1021                                    const struct kvaser_msg *msg)
1022 {
1023         struct kvaser_usb_error_summary es = { };
1024
1025         switch (msg->id) {
1026         /* Sometimes errors are sent as unsolicited chip state events */
1027         case CMD_CHIP_STATE_EVENT:
1028                 es.channel = msg->u.usbcan.chip_state_event.channel;
1029                 es.status =  msg->u.usbcan.chip_state_event.status;
1030                 es.txerr = msg->u.usbcan.chip_state_event.tx_errors_count;
1031                 es.rxerr = msg->u.usbcan.chip_state_event.rx_errors_count;
1032                 kvaser_usbcan_conditionally_rx_error(dev, &es);
1033                 break;
1034
1035         case CMD_CAN_ERROR_EVENT:
1036                 es.channel = 0;
1037                 es.status = msg->u.usbcan.error_event.status_ch0;
1038                 es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch0;
1039                 es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch0;
1040                 es.usbcan.other_ch_status =
1041                         msg->u.usbcan.error_event.status_ch1;
1042                 kvaser_usbcan_conditionally_rx_error(dev, &es);
1043
1044                 /* The USBCAN firmware supports up to 2 channels.
1045                  * Now that ch0 was checked, check if ch1 has any errors.
1046                  */
1047                 if (dev->nchannels == MAX_USBCAN_NET_DEVICES) {
1048                         es.channel = 1;
1049                         es.status = msg->u.usbcan.error_event.status_ch1;
1050                         es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch1;
1051                         es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch1;
1052                         es.usbcan.other_ch_status =
1053                                 msg->u.usbcan.error_event.status_ch0;
1054                         kvaser_usbcan_conditionally_rx_error(dev, &es);
1055                 }
1056                 break;
1057
1058         default:
1059                 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
1060                         msg->id);
1061         }
1062 }
1063
1064 static void kvaser_leaf_rx_error(const struct kvaser_usb *dev,
1065                                  const struct kvaser_msg *msg)
1066 {
1067         struct kvaser_usb_error_summary es = { };
1068
1069         switch (msg->id) {
1070         case CMD_CAN_ERROR_EVENT:
1071                 es.channel = msg->u.leaf.error_event.channel;
1072                 es.status =  msg->u.leaf.error_event.status;
1073                 es.txerr = msg->u.leaf.error_event.tx_errors_count;
1074                 es.rxerr = msg->u.leaf.error_event.rx_errors_count;
1075                 es.leaf.error_factor = msg->u.leaf.error_event.error_factor;
1076                 break;
1077         case CMD_LEAF_LOG_MESSAGE:
1078                 es.channel = msg->u.leaf.log_message.channel;
1079                 es.status = msg->u.leaf.log_message.data[0];
1080                 es.txerr = msg->u.leaf.log_message.data[2];
1081                 es.rxerr = msg->u.leaf.log_message.data[3];
1082                 es.leaf.error_factor = msg->u.leaf.log_message.data[1];
1083                 break;
1084         case CMD_CHIP_STATE_EVENT:
1085                 es.channel = msg->u.leaf.chip_state_event.channel;
1086                 es.status =  msg->u.leaf.chip_state_event.status;
1087                 es.txerr = msg->u.leaf.chip_state_event.tx_errors_count;
1088                 es.rxerr = msg->u.leaf.chip_state_event.rx_errors_count;
1089                 es.leaf.error_factor = 0;
1090                 break;
1091         default:
1092                 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
1093                         msg->id);
1094                 return;
1095         }
1096
1097         kvaser_usb_rx_error(dev, &es);
1098 }
1099
1100 static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
1101                                   const struct kvaser_msg *msg)
1102 {
1103         struct can_frame *cf;
1104         struct sk_buff *skb;
1105         struct net_device_stats *stats = &priv->netdev->stats;
1106
1107         if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1108                                          MSG_FLAG_NERR)) {
1109                 netdev_err(priv->netdev, "Unknown error (flags: 0x%02x)\n",
1110                            msg->u.rx_can_header.flag);
1111
1112                 stats->rx_errors++;
1113                 return;
1114         }
1115
1116         if (msg->u.rx_can_header.flag & MSG_FLAG_OVERRUN) {
1117                 stats->rx_over_errors++;
1118                 stats->rx_errors++;
1119
1120                 skb = alloc_can_err_skb(priv->netdev, &cf);
1121                 if (!skb) {
1122                         stats->rx_dropped++;
1123                         return;
1124                 }
1125
1126                 cf->can_id |= CAN_ERR_CRTL;
1127                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
1128
1129                 stats->rx_packets++;
1130                 stats->rx_bytes += cf->can_dlc;
1131                 netif_rx(skb);
1132         }
1133 }
1134
1135 static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
1136                                   const struct kvaser_msg *msg)
1137 {
1138         struct kvaser_usb_net_priv *priv;
1139         struct can_frame *cf;
1140         struct sk_buff *skb;
1141         struct net_device_stats *stats;
1142         u8 channel = msg->u.rx_can_header.channel;
1143         const u8 *rx_msg = NULL;        /* GCC */
1144
1145         if (channel >= dev->nchannels) {
1146                 dev_err(dev->udev->dev.parent,
1147                         "Invalid channel number (%d)\n", channel);
1148                 return;
1149         }
1150
1151         priv = dev->nets[channel];
1152         stats = &priv->netdev->stats;
1153
1154         if ((msg->u.rx_can_header.flag & MSG_FLAG_ERROR_FRAME) &&
1155             (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE)) {
1156                 kvaser_leaf_rx_error(dev, msg);
1157                 return;
1158         } else if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1159                                                 MSG_FLAG_NERR |
1160                                                 MSG_FLAG_OVERRUN)) {
1161                 kvaser_usb_rx_can_err(priv, msg);
1162                 return;
1163         } else if (msg->u.rx_can_header.flag & ~MSG_FLAG_REMOTE_FRAME) {
1164                 netdev_warn(priv->netdev,
1165                             "Unhandled frame (flags: 0x%02x)",
1166                             msg->u.rx_can_header.flag);
1167                 return;
1168         }
1169
1170         switch (dev->family) {
1171         case KVASER_LEAF:
1172                 rx_msg = msg->u.leaf.rx_can.msg;
1173                 break;
1174         case KVASER_USBCAN:
1175                 rx_msg = msg->u.usbcan.rx_can.msg;
1176                 break;
1177         }
1178
1179         skb = alloc_can_skb(priv->netdev, &cf);
1180         if (!skb) {
1181                 stats->tx_dropped++;
1182                 return;
1183         }
1184
1185         if (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE) {
1186                 cf->can_id = le32_to_cpu(msg->u.leaf.log_message.id);
1187                 if (cf->can_id & KVASER_EXTENDED_FRAME)
1188                         cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
1189                 else
1190                         cf->can_id &= CAN_SFF_MASK;
1191
1192                 cf->can_dlc = get_can_dlc(msg->u.leaf.log_message.dlc);
1193
1194                 if (msg->u.leaf.log_message.flags & MSG_FLAG_REMOTE_FRAME)
1195                         cf->can_id |= CAN_RTR_FLAG;
1196                 else
1197                         memcpy(cf->data, &msg->u.leaf.log_message.data,
1198                                cf->can_dlc);
1199         } else {
1200                 cf->can_id = ((rx_msg[0] & 0x1f) << 6) | (rx_msg[1] & 0x3f);
1201
1202                 if (msg->id == CMD_RX_EXT_MESSAGE) {
1203                         cf->can_id <<= 18;
1204                         cf->can_id |= ((rx_msg[2] & 0x0f) << 14) |
1205                                       ((rx_msg[3] & 0xff) << 6) |
1206                                       (rx_msg[4] & 0x3f);
1207                         cf->can_id |= CAN_EFF_FLAG;
1208                 }
1209
1210                 cf->can_dlc = get_can_dlc(rx_msg[5]);
1211
1212                 if (msg->u.rx_can_header.flag & MSG_FLAG_REMOTE_FRAME)
1213                         cf->can_id |= CAN_RTR_FLAG;
1214                 else
1215                         memcpy(cf->data, &rx_msg[6],
1216                                cf->can_dlc);
1217         }
1218
1219         stats->rx_packets++;
1220         stats->rx_bytes += cf->can_dlc;
1221         netif_rx(skb);
1222 }
1223
1224 static void kvaser_usb_start_chip_reply(const struct kvaser_usb *dev,
1225                                         const struct kvaser_msg *msg)
1226 {
1227         struct kvaser_usb_net_priv *priv;
1228         u8 channel = msg->u.simple.channel;
1229
1230         if (channel >= dev->nchannels) {
1231                 dev_err(dev->udev->dev.parent,
1232                         "Invalid channel number (%d)\n", channel);
1233                 return;
1234         }
1235
1236         priv = dev->nets[channel];
1237
1238         if (completion_done(&priv->start_comp) &&
1239             netif_queue_stopped(priv->netdev)) {
1240                 netif_wake_queue(priv->netdev);
1241         } else {
1242                 netif_start_queue(priv->netdev);
1243                 complete(&priv->start_comp);
1244         }
1245 }
1246
1247 static void kvaser_usb_stop_chip_reply(const struct kvaser_usb *dev,
1248                                        const struct kvaser_msg *msg)
1249 {
1250         struct kvaser_usb_net_priv *priv;
1251         u8 channel = msg->u.simple.channel;
1252
1253         if (channel >= dev->nchannels) {
1254                 dev_err(dev->udev->dev.parent,
1255                         "Invalid channel number (%d)\n", channel);
1256                 return;
1257         }
1258
1259         priv = dev->nets[channel];
1260
1261         complete(&priv->stop_comp);
1262 }
1263
1264 static void kvaser_usb_handle_message(const struct kvaser_usb *dev,
1265                                       const struct kvaser_msg *msg)
1266 {
1267         switch (msg->id) {
1268         case CMD_START_CHIP_REPLY:
1269                 kvaser_usb_start_chip_reply(dev, msg);
1270                 break;
1271
1272         case CMD_STOP_CHIP_REPLY:
1273                 kvaser_usb_stop_chip_reply(dev, msg);
1274                 break;
1275
1276         case CMD_RX_STD_MESSAGE:
1277         case CMD_RX_EXT_MESSAGE:
1278                 kvaser_usb_rx_can_msg(dev, msg);
1279                 break;
1280
1281         case CMD_LEAF_LOG_MESSAGE:
1282                 if (dev->family != KVASER_LEAF)
1283                         goto warn;
1284                 kvaser_usb_rx_can_msg(dev, msg);
1285                 break;
1286
1287         case CMD_CHIP_STATE_EVENT:
1288         case CMD_CAN_ERROR_EVENT:
1289                 if (dev->family == KVASER_LEAF)
1290                         kvaser_leaf_rx_error(dev, msg);
1291                 else
1292                         kvaser_usbcan_rx_error(dev, msg);
1293                 break;
1294
1295         case CMD_TX_ACKNOWLEDGE:
1296                 kvaser_usb_tx_acknowledge(dev, msg);
1297                 break;
1298
1299         /* Ignored messages */
1300         case CMD_USBCAN_CLOCK_OVERFLOW_EVENT:
1301                 if (dev->family != KVASER_USBCAN)
1302                         goto warn;
1303                 break;
1304
1305         case CMD_FLUSH_QUEUE_REPLY:
1306                 if (dev->family != KVASER_LEAF)
1307                         goto warn;
1308                 break;
1309
1310         default:
1311 warn:           dev_warn(dev->udev->dev.parent,
1312                          "Unhandled message (%d)\n", msg->id);
1313                 break;
1314         }
1315 }
1316
1317 static void kvaser_usb_read_bulk_callback(struct urb *urb)
1318 {
1319         struct kvaser_usb *dev = urb->context;
1320         struct kvaser_msg *msg;
1321         int pos = 0;
1322         int err, i;
1323
1324         switch (urb->status) {
1325         case 0:
1326                 break;
1327         case -ENOENT:
1328         case -ESHUTDOWN:
1329                 return;
1330         default:
1331                 dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n",
1332                          urb->status);
1333                 goto resubmit_urb;
1334         }
1335
1336         while (pos <= urb->actual_length - MSG_HEADER_LEN) {
1337                 msg = urb->transfer_buffer + pos;
1338
1339                 /* The Kvaser firmware can only read and write messages that
1340                  * does not cross the USB's endpoint wMaxPacketSize boundary.
1341                  * If a follow-up command crosses such boundary, firmware puts
1342                  * a placeholder zero-length command in its place then aligns
1343                  * the real command to the next max packet size.
1344                  *
1345                  * Handle such cases or we're going to miss a significant
1346                  * number of events in case of a heavy rx load on the bus.
1347                  */
1348                 if (msg->len == 0) {
1349                         pos = round_up(pos, le16_to_cpu(dev->bulk_in->
1350                                                         wMaxPacketSize));
1351                         continue;
1352                 }
1353
1354                 if (pos + msg->len > urb->actual_length) {
1355                         dev_err(dev->udev->dev.parent, "Format error\n");
1356                         break;
1357                 }
1358
1359                 kvaser_usb_handle_message(dev, msg);
1360                 pos += msg->len;
1361         }
1362
1363 resubmit_urb:
1364         usb_fill_bulk_urb(urb, dev->udev,
1365                           usb_rcvbulkpipe(dev->udev,
1366                                           dev->bulk_in->bEndpointAddress),
1367                           urb->transfer_buffer, RX_BUFFER_SIZE,
1368                           kvaser_usb_read_bulk_callback, dev);
1369
1370         err = usb_submit_urb(urb, GFP_ATOMIC);
1371         if (err == -ENODEV) {
1372                 for (i = 0; i < dev->nchannels; i++) {
1373                         if (!dev->nets[i])
1374                                 continue;
1375
1376                         netif_device_detach(dev->nets[i]->netdev);
1377                 }
1378         } else if (err) {
1379                 dev_err(dev->udev->dev.parent,
1380                         "Failed resubmitting read bulk urb: %d\n", err);
1381         }
1382
1383         return;
1384 }
1385
1386 static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
1387 {
1388         int i, err = 0;
1389
1390         if (dev->rxinitdone)
1391                 return 0;
1392
1393         for (i = 0; i < MAX_RX_URBS; i++) {
1394                 struct urb *urb = NULL;
1395                 u8 *buf = NULL;
1396                 dma_addr_t buf_dma;
1397
1398                 urb = usb_alloc_urb(0, GFP_KERNEL);
1399                 if (!urb) {
1400                         err = -ENOMEM;
1401                         break;
1402                 }
1403
1404                 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE,
1405                                          GFP_KERNEL, &buf_dma);
1406                 if (!buf) {
1407                         dev_warn(dev->udev->dev.parent,
1408                                  "No memory left for USB buffer\n");
1409                         usb_free_urb(urb);
1410                         err = -ENOMEM;
1411                         break;
1412                 }
1413
1414                 usb_fill_bulk_urb(urb, dev->udev,
1415                                   usb_rcvbulkpipe(dev->udev,
1416                                           dev->bulk_in->bEndpointAddress),
1417                                   buf, RX_BUFFER_SIZE,
1418                                   kvaser_usb_read_bulk_callback,
1419                                   dev);
1420                 urb->transfer_dma = buf_dma;
1421                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1422                 usb_anchor_urb(urb, &dev->rx_submitted);
1423
1424                 err = usb_submit_urb(urb, GFP_KERNEL);
1425                 if (err) {
1426                         usb_unanchor_urb(urb);
1427                         usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
1428                                           buf_dma);
1429                         usb_free_urb(urb);
1430                         break;
1431                 }
1432
1433                 dev->rxbuf[i] = buf;
1434                 dev->rxbuf_dma[i] = buf_dma;
1435
1436                 usb_free_urb(urb);
1437         }
1438
1439         if (i == 0) {
1440                 dev_warn(dev->udev->dev.parent,
1441                          "Cannot setup read URBs, error %d\n", err);
1442                 return err;
1443         } else if (i < MAX_RX_URBS) {
1444                 dev_warn(dev->udev->dev.parent,
1445                          "RX performances may be slow\n");
1446         }
1447
1448         dev->rxinitdone = true;
1449
1450         return 0;
1451 }
1452
1453 static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1454 {
1455         struct kvaser_msg *msg;
1456         int rc;
1457
1458         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1459         if (!msg)
1460                 return -ENOMEM;
1461
1462         msg->id = CMD_SET_CTRL_MODE;
1463         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_ctrl_mode);
1464         msg->u.ctrl_mode.tid = 0xff;
1465         msg->u.ctrl_mode.channel = priv->channel;
1466
1467         if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1468                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1469         else
1470                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1471
1472         rc = kvaser_usb_send_msg(priv->dev, msg);
1473
1474         kfree(msg);
1475         return rc;
1476 }
1477
1478 static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv)
1479 {
1480         int err;
1481
1482         init_completion(&priv->start_comp);
1483
1484         err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP,
1485                                          priv->channel);
1486         if (err)
1487                 return err;
1488
1489         if (!wait_for_completion_timeout(&priv->start_comp,
1490                                          msecs_to_jiffies(START_TIMEOUT)))
1491                 return -ETIMEDOUT;
1492
1493         return 0;
1494 }
1495
1496 static int kvaser_usb_open(struct net_device *netdev)
1497 {
1498         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1499         struct kvaser_usb *dev = priv->dev;
1500         int err;
1501
1502         err = open_candev(netdev);
1503         if (err)
1504                 return err;
1505
1506         err = kvaser_usb_setup_rx_urbs(dev);
1507         if (err)
1508                 goto error;
1509
1510         err = kvaser_usb_set_opt_mode(priv);
1511         if (err)
1512                 goto error;
1513
1514         err = kvaser_usb_start_chip(priv);
1515         if (err) {
1516                 netdev_warn(netdev, "Cannot start device, error %d\n", err);
1517                 goto error;
1518         }
1519
1520         priv->can.state = CAN_STATE_ERROR_ACTIVE;
1521
1522         return 0;
1523
1524 error:
1525         close_candev(netdev);
1526         return err;
1527 }
1528
1529 static void kvaser_usb_reset_tx_urb_contexts(struct kvaser_usb_net_priv *priv)
1530 {
1531         int i, max_tx_urbs;
1532
1533         max_tx_urbs = priv->dev->max_tx_urbs;
1534
1535         priv->active_tx_contexts = 0;
1536         for (i = 0; i < max_tx_urbs; i++)
1537                 priv->tx_contexts[i].echo_index = max_tx_urbs;
1538 }
1539
1540 /* This method might sleep. Do not call it in the atomic context
1541  * of URB completions.
1542  */
1543 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
1544 {
1545         usb_kill_anchored_urbs(&priv->tx_submitted);
1546         kvaser_usb_reset_tx_urb_contexts(priv);
1547 }
1548
1549 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
1550 {
1551         int i;
1552
1553         usb_kill_anchored_urbs(&dev->rx_submitted);
1554
1555         for (i = 0; i < MAX_RX_URBS; i++)
1556                 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
1557                                   dev->rxbuf[i],
1558                                   dev->rxbuf_dma[i]);
1559
1560         for (i = 0; i < dev->nchannels; i++) {
1561                 struct kvaser_usb_net_priv *priv = dev->nets[i];
1562
1563                 if (priv)
1564                         kvaser_usb_unlink_tx_urbs(priv);
1565         }
1566 }
1567
1568 static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv)
1569 {
1570         int err;
1571
1572         init_completion(&priv->stop_comp);
1573
1574         err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP,
1575                                          priv->channel);
1576         if (err)
1577                 return err;
1578
1579         if (!wait_for_completion_timeout(&priv->stop_comp,
1580                                          msecs_to_jiffies(STOP_TIMEOUT)))
1581                 return -ETIMEDOUT;
1582
1583         return 0;
1584 }
1585
1586 static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv)
1587 {
1588         struct kvaser_msg *msg;
1589         int rc;
1590
1591         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1592         if (!msg)
1593                 return -ENOMEM;
1594
1595         msg->id = CMD_FLUSH_QUEUE;
1596         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_flush_queue);
1597         msg->u.flush_queue.channel = priv->channel;
1598         msg->u.flush_queue.flags = 0x00;
1599
1600         rc = kvaser_usb_send_msg(priv->dev, msg);
1601
1602         kfree(msg);
1603         return rc;
1604 }
1605
1606 static int kvaser_usb_close(struct net_device *netdev)
1607 {
1608         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1609         struct kvaser_usb *dev = priv->dev;
1610         int err;
1611
1612         netif_stop_queue(netdev);
1613
1614         err = kvaser_usb_flush_queue(priv);
1615         if (err)
1616                 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
1617
1618         err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel);
1619         if (err)
1620                 netdev_warn(netdev, "Cannot reset card, error %d\n", err);
1621
1622         err = kvaser_usb_stop_chip(priv);
1623         if (err)
1624                 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
1625
1626         /* reset tx contexts */
1627         kvaser_usb_unlink_tx_urbs(priv);
1628
1629         priv->can.state = CAN_STATE_STOPPED;
1630         close_candev(priv->netdev);
1631
1632         return 0;
1633 }
1634
1635 static void kvaser_usb_write_bulk_callback(struct urb *urb)
1636 {
1637         struct kvaser_usb_tx_urb_context *context = urb->context;
1638         struct kvaser_usb_net_priv *priv;
1639         struct net_device *netdev;
1640
1641         if (WARN_ON(!context))
1642                 return;
1643
1644         priv = context->priv;
1645         netdev = priv->netdev;
1646
1647         kfree(urb->transfer_buffer);
1648
1649         if (!netif_device_present(netdev))
1650                 return;
1651
1652         if (urb->status)
1653                 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1654 }
1655
1656 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1657                                          struct net_device *netdev)
1658 {
1659         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1660         struct kvaser_usb *dev = priv->dev;
1661         struct net_device_stats *stats = &netdev->stats;
1662         struct can_frame *cf = (struct can_frame *)skb->data;
1663         struct kvaser_usb_tx_urb_context *context = NULL;
1664         struct urb *urb;
1665         void *buf;
1666         struct kvaser_msg *msg;
1667         int i, err, ret = NETDEV_TX_OK;
1668         u8 *msg_tx_can_flags = NULL;            /* GCC */
1669         unsigned long flags;
1670
1671         if (can_dropped_invalid_skb(netdev, skb))
1672                 return NETDEV_TX_OK;
1673
1674         urb = usb_alloc_urb(0, GFP_ATOMIC);
1675         if (!urb) {
1676                 stats->tx_dropped++;
1677                 dev_kfree_skb(skb);
1678                 return NETDEV_TX_OK;
1679         }
1680
1681         buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1682         if (!buf) {
1683                 stats->tx_dropped++;
1684                 dev_kfree_skb(skb);
1685                 goto freeurb;
1686         }
1687
1688         msg = buf;
1689         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
1690         msg->u.tx_can.channel = priv->channel;
1691
1692         switch (dev->family) {
1693         case KVASER_LEAF:
1694                 msg_tx_can_flags = &msg->u.tx_can.leaf.flags;
1695                 break;
1696         case KVASER_USBCAN:
1697                 msg_tx_can_flags = &msg->u.tx_can.usbcan.flags;
1698                 break;
1699         }
1700
1701         *msg_tx_can_flags = 0;
1702
1703         if (cf->can_id & CAN_EFF_FLAG) {
1704                 msg->id = CMD_TX_EXT_MESSAGE;
1705                 msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
1706                 msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
1707                 msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
1708                 msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
1709                 msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
1710         } else {
1711                 msg->id = CMD_TX_STD_MESSAGE;
1712                 msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
1713                 msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
1714         }
1715
1716         msg->u.tx_can.msg[5] = cf->can_dlc;
1717         memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
1718
1719         if (cf->can_id & CAN_RTR_FLAG)
1720                 *msg_tx_can_flags |= MSG_FLAG_REMOTE_FRAME;
1721
1722         spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1723         for (i = 0; i < dev->max_tx_urbs; i++) {
1724                 if (priv->tx_contexts[i].echo_index == dev->max_tx_urbs) {
1725                         context = &priv->tx_contexts[i];
1726
1727                         context->echo_index = i;
1728                         can_put_echo_skb(skb, netdev, context->echo_index);
1729                         ++priv->active_tx_contexts;
1730                         if (priv->active_tx_contexts >= dev->max_tx_urbs)
1731                                 netif_stop_queue(netdev);
1732
1733                         break;
1734                 }
1735         }
1736         spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1737
1738         /* This should never happen; it implies a flow control bug */
1739         if (!context) {
1740                 netdev_warn(netdev, "cannot find free context\n");
1741
1742                 kfree(buf);
1743                 ret =  NETDEV_TX_BUSY;
1744                 goto freeurb;
1745         }
1746
1747         context->priv = priv;
1748         context->dlc = cf->can_dlc;
1749
1750         msg->u.tx_can.tid = context->echo_index;
1751
1752         usb_fill_bulk_urb(urb, dev->udev,
1753                           usb_sndbulkpipe(dev->udev,
1754                                           dev->bulk_out->bEndpointAddress),
1755                           buf, msg->len,
1756                           kvaser_usb_write_bulk_callback, context);
1757         usb_anchor_urb(urb, &priv->tx_submitted);
1758
1759         err = usb_submit_urb(urb, GFP_ATOMIC);
1760         if (unlikely(err)) {
1761                 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1762
1763                 can_free_echo_skb(netdev, context->echo_index);
1764                 context->echo_index = dev->max_tx_urbs;
1765                 --priv->active_tx_contexts;
1766                 netif_wake_queue(netdev);
1767
1768                 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1769
1770                 usb_unanchor_urb(urb);
1771
1772                 stats->tx_dropped++;
1773
1774                 if (err == -ENODEV)
1775                         netif_device_detach(netdev);
1776                 else
1777                         netdev_warn(netdev, "Failed tx_urb %d\n", err);
1778
1779                 goto freeurb;
1780         }
1781
1782         ret = NETDEV_TX_OK;
1783
1784 freeurb:
1785         usb_free_urb(urb);
1786         return ret;
1787 }
1788
1789 static const struct net_device_ops kvaser_usb_netdev_ops = {
1790         .ndo_open = kvaser_usb_open,
1791         .ndo_stop = kvaser_usb_close,
1792         .ndo_start_xmit = kvaser_usb_start_xmit,
1793         .ndo_change_mtu = can_change_mtu,
1794 };
1795
1796 static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1797         .name = "kvaser_usb",
1798         .tseg1_min = KVASER_USB_TSEG1_MIN,
1799         .tseg1_max = KVASER_USB_TSEG1_MAX,
1800         .tseg2_min = KVASER_USB_TSEG2_MIN,
1801         .tseg2_max = KVASER_USB_TSEG2_MAX,
1802         .sjw_max = KVASER_USB_SJW_MAX,
1803         .brp_min = KVASER_USB_BRP_MIN,
1804         .brp_max = KVASER_USB_BRP_MAX,
1805         .brp_inc = KVASER_USB_BRP_INC,
1806 };
1807
1808 static int kvaser_usb_set_bittiming(struct net_device *netdev)
1809 {
1810         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1811         struct can_bittiming *bt = &priv->can.bittiming;
1812         struct kvaser_usb *dev = priv->dev;
1813         struct kvaser_msg *msg;
1814         int rc;
1815
1816         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1817         if (!msg)
1818                 return -ENOMEM;
1819
1820         msg->id = CMD_SET_BUS_PARAMS;
1821         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1822         msg->u.busparams.channel = priv->channel;
1823         msg->u.busparams.tid = 0xff;
1824         msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1825         msg->u.busparams.sjw = bt->sjw;
1826         msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1827         msg->u.busparams.tseg2 = bt->phase_seg2;
1828
1829         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1830                 msg->u.busparams.no_samp = 3;
1831         else
1832                 msg->u.busparams.no_samp = 1;
1833
1834         rc = kvaser_usb_send_msg(dev, msg);
1835
1836         kfree(msg);
1837         return rc;
1838 }
1839
1840 static int kvaser_usb_set_mode(struct net_device *netdev,
1841                                enum can_mode mode)
1842 {
1843         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1844         int err;
1845
1846         switch (mode) {
1847         case CAN_MODE_START:
1848                 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1849                 if (err)
1850                         return err;
1851                 break;
1852         default:
1853                 return -EOPNOTSUPP;
1854         }
1855
1856         return 0;
1857 }
1858
1859 static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1860                                        struct can_berr_counter *bec)
1861 {
1862         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1863
1864         *bec = priv->bec;
1865
1866         return 0;
1867 }
1868
1869 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1870 {
1871         int i;
1872
1873         for (i = 0; i < dev->nchannels; i++) {
1874                 if (!dev->nets[i])
1875                         continue;
1876
1877                 unregister_candev(dev->nets[i]->netdev);
1878         }
1879
1880         kvaser_usb_unlink_all_urbs(dev);
1881
1882         for (i = 0; i < dev->nchannels; i++) {
1883                 if (!dev->nets[i])
1884                         continue;
1885
1886                 free_candev(dev->nets[i]->netdev);
1887         }
1888 }
1889
1890 static int kvaser_usb_init_one(struct usb_interface *intf,
1891                                const struct usb_device_id *id, int channel)
1892 {
1893         struct kvaser_usb *dev = usb_get_intfdata(intf);
1894         struct net_device *netdev;
1895         struct kvaser_usb_net_priv *priv;
1896         int err;
1897
1898         err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, channel);
1899         if (err)
1900                 return err;
1901
1902         netdev = alloc_candev(sizeof(*priv) +
1903                               dev->max_tx_urbs * sizeof(*priv->tx_contexts),
1904                               dev->max_tx_urbs);
1905         if (!netdev) {
1906                 dev_err(&intf->dev, "Cannot alloc candev\n");
1907                 return -ENOMEM;
1908         }
1909
1910         priv = netdev_priv(netdev);
1911
1912         init_usb_anchor(&priv->tx_submitted);
1913         init_completion(&priv->start_comp);
1914         init_completion(&priv->stop_comp);
1915
1916         priv->dev = dev;
1917         priv->netdev = netdev;
1918         priv->channel = channel;
1919
1920         spin_lock_init(&priv->tx_contexts_lock);
1921         kvaser_usb_reset_tx_urb_contexts(priv);
1922
1923         priv->can.state = CAN_STATE_STOPPED;
1924         priv->can.clock.freq = CAN_USB_CLOCK;
1925         priv->can.bittiming_const = &kvaser_usb_bittiming_const;
1926         priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
1927         priv->can.do_set_mode = kvaser_usb_set_mode;
1928         if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
1929                 priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
1930         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
1931         if (id->driver_info & KVASER_HAS_SILENT_MODE)
1932                 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1933
1934         netdev->flags |= IFF_ECHO;
1935
1936         netdev->netdev_ops = &kvaser_usb_netdev_ops;
1937
1938         SET_NETDEV_DEV(netdev, &intf->dev);
1939         netdev->dev_id = channel;
1940
1941         dev->nets[channel] = priv;
1942
1943         err = register_candev(netdev);
1944         if (err) {
1945                 dev_err(&intf->dev, "Failed to register can device\n");
1946                 free_candev(netdev);
1947                 dev->nets[channel] = NULL;
1948                 return err;
1949         }
1950
1951         netdev_dbg(netdev, "device registered\n");
1952
1953         return 0;
1954 }
1955
1956 static int kvaser_usb_get_endpoints(const struct usb_interface *intf,
1957                                     struct usb_endpoint_descriptor **in,
1958                                     struct usb_endpoint_descriptor **out)
1959 {
1960         const struct usb_host_interface *iface_desc;
1961         struct usb_endpoint_descriptor *endpoint;
1962         int i;
1963
1964         iface_desc = &intf->altsetting[0];
1965
1966         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1967                 endpoint = &iface_desc->endpoint[i].desc;
1968
1969                 if (!*in && usb_endpoint_is_bulk_in(endpoint))
1970                         *in = endpoint;
1971
1972                 if (!*out && usb_endpoint_is_bulk_out(endpoint))
1973                         *out = endpoint;
1974
1975                 /* use first bulk endpoint for in and out */
1976                 if (*in && *out)
1977                         return 0;
1978         }
1979
1980         return -ENODEV;
1981 }
1982
1983 static int kvaser_usb_probe(struct usb_interface *intf,
1984                             const struct usb_device_id *id)
1985 {
1986         struct kvaser_usb *dev;
1987         int err = -ENOMEM;
1988         int i, retry = 3;
1989
1990         dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
1991         if (!dev)
1992                 return -ENOMEM;
1993
1994         if (kvaser_is_leaf(id)) {
1995                 dev->family = KVASER_LEAF;
1996         } else if (kvaser_is_usbcan(id)) {
1997                 dev->family = KVASER_USBCAN;
1998         } else {
1999                 dev_err(&intf->dev,
2000                         "Product ID (%d) does not belong to any known Kvaser USB family",
2001                         id->idProduct);
2002                 return -ENODEV;
2003         }
2004
2005         err = kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
2006         if (err) {
2007                 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
2008                 return err;
2009         }
2010
2011         dev->udev = interface_to_usbdev(intf);
2012
2013         init_usb_anchor(&dev->rx_submitted);
2014
2015         usb_set_intfdata(intf, dev);
2016
2017         /* On some x86 laptops, plugging a Kvaser device again after
2018          * an unplug makes the firmware always ignore the very first
2019          * command. For such a case, provide some room for retries
2020          * instead of completely exiting the driver.
2021          */
2022         do {
2023                 err = kvaser_usb_get_software_info(dev);
2024         } while (--retry && err == -ETIMEDOUT);
2025
2026         if (err) {
2027                 dev_err(&intf->dev,
2028                         "Cannot get software infos, error %d\n", err);
2029                 return err;
2030         }
2031
2032         dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
2033                 ((dev->fw_version >> 24) & 0xff),
2034                 ((dev->fw_version >> 16) & 0xff),
2035                 (dev->fw_version & 0xffff));
2036
2037         dev_dbg(&intf->dev, "Max outstanding tx = %d URBs\n", dev->max_tx_urbs);
2038
2039         err = kvaser_usb_get_card_info(dev);
2040         if (err) {
2041                 dev_err(&intf->dev,
2042                         "Cannot get card infos, error %d\n", err);
2043                 return err;
2044         }
2045
2046         for (i = 0; i < dev->nchannels; i++) {
2047                 err = kvaser_usb_init_one(intf, id, i);
2048                 if (err) {
2049                         kvaser_usb_remove_interfaces(dev);
2050                         return err;
2051                 }
2052         }
2053
2054         return 0;
2055 }
2056
2057 static void kvaser_usb_disconnect(struct usb_interface *intf)
2058 {
2059         struct kvaser_usb *dev = usb_get_intfdata(intf);
2060
2061         usb_set_intfdata(intf, NULL);
2062
2063         if (!dev)
2064                 return;
2065
2066         kvaser_usb_remove_interfaces(dev);
2067 }
2068
2069 static struct usb_driver kvaser_usb_driver = {
2070         .name = "kvaser_usb",
2071         .probe = kvaser_usb_probe,
2072         .disconnect = kvaser_usb_disconnect,
2073         .id_table = kvaser_usb_table,
2074 };
2075
2076 module_usb_driver(kvaser_usb_driver);
2077
2078 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
2079 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
2080 MODULE_LICENSE("GPL v2");