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 oustanding,
 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_ratelimited(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 = kzalloc(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                 kfree(buf);
 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->rx_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         case CMD_FLUSH_QUEUE_REPLY:
1307                 if (dev->family != KVASER_LEAF)
1308                         goto warn;
1309                 break;
1310
1311         default:
1312 warn:           dev_warn(dev->udev->dev.parent,
1313                          "Unhandled message (%d)\n", msg->id);
1314                 break;
1315         }
1316 }
1317
1318 static void kvaser_usb_read_bulk_callback(struct urb *urb)
1319 {
1320         struct kvaser_usb *dev = urb->context;
1321         struct kvaser_msg *msg;
1322         int pos = 0;
1323         int err, i;
1324
1325         switch (urb->status) {
1326         case 0:
1327                 break;
1328         case -ENOENT:
1329         case -EPIPE:
1330         case -EPROTO:
1331         case -ESHUTDOWN:
1332                 return;
1333         default:
1334                 dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n",
1335                          urb->status);
1336                 goto resubmit_urb;
1337         }
1338
1339         while (pos <= (int)(urb->actual_length - MSG_HEADER_LEN)) {
1340                 msg = urb->transfer_buffer + pos;
1341
1342                 /* The Kvaser firmware can only read and write messages that
1343                  * does not cross the USB's endpoint wMaxPacketSize boundary.
1344                  * If a follow-up command crosses such boundary, firmware puts
1345                  * a placeholder zero-length command in its place then aligns
1346                  * the real command to the next max packet size.
1347                  *
1348                  * Handle such cases or we're going to miss a significant
1349                  * number of events in case of a heavy rx load on the bus.
1350                  */
1351                 if (msg->len == 0) {
1352                         pos = round_up(pos, le16_to_cpu(dev->bulk_in->
1353                                                         wMaxPacketSize));
1354                         continue;
1355                 }
1356
1357                 if (pos + msg->len > urb->actual_length) {
1358                         dev_err_ratelimited(dev->udev->dev.parent,
1359                                             "Format error\n");
1360                         break;
1361                 }
1362
1363                 kvaser_usb_handle_message(dev, msg);
1364                 pos += msg->len;
1365         }
1366
1367 resubmit_urb:
1368         usb_fill_bulk_urb(urb, dev->udev,
1369                           usb_rcvbulkpipe(dev->udev,
1370                                           dev->bulk_in->bEndpointAddress),
1371                           urb->transfer_buffer, RX_BUFFER_SIZE,
1372                           kvaser_usb_read_bulk_callback, dev);
1373
1374         err = usb_submit_urb(urb, GFP_ATOMIC);
1375         if (err == -ENODEV) {
1376                 for (i = 0; i < dev->nchannels; i++) {
1377                         if (!dev->nets[i])
1378                                 continue;
1379
1380                         netif_device_detach(dev->nets[i]->netdev);
1381                 }
1382         } else if (err) {
1383                 dev_err(dev->udev->dev.parent,
1384                         "Failed resubmitting read bulk urb: %d\n", err);
1385         }
1386
1387         return;
1388 }
1389
1390 static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
1391 {
1392         int i, err = 0;
1393
1394         if (dev->rxinitdone)
1395                 return 0;
1396
1397         for (i = 0; i < MAX_RX_URBS; i++) {
1398                 struct urb *urb = NULL;
1399                 u8 *buf = NULL;
1400                 dma_addr_t buf_dma;
1401
1402                 urb = usb_alloc_urb(0, GFP_KERNEL);
1403                 if (!urb) {
1404                         err = -ENOMEM;
1405                         break;
1406                 }
1407
1408                 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE,
1409                                          GFP_KERNEL, &buf_dma);
1410                 if (!buf) {
1411                         dev_warn(dev->udev->dev.parent,
1412                                  "No memory left for USB buffer\n");
1413                         usb_free_urb(urb);
1414                         err = -ENOMEM;
1415                         break;
1416                 }
1417
1418                 usb_fill_bulk_urb(urb, dev->udev,
1419                                   usb_rcvbulkpipe(dev->udev,
1420                                           dev->bulk_in->bEndpointAddress),
1421                                   buf, RX_BUFFER_SIZE,
1422                                   kvaser_usb_read_bulk_callback,
1423                                   dev);
1424                 urb->transfer_dma = buf_dma;
1425                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1426                 usb_anchor_urb(urb, &dev->rx_submitted);
1427
1428                 err = usb_submit_urb(urb, GFP_KERNEL);
1429                 if (err) {
1430                         usb_unanchor_urb(urb);
1431                         usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
1432                                           buf_dma);
1433                         usb_free_urb(urb);
1434                         break;
1435                 }
1436
1437                 dev->rxbuf[i] = buf;
1438                 dev->rxbuf_dma[i] = buf_dma;
1439
1440                 usb_free_urb(urb);
1441         }
1442
1443         if (i == 0) {
1444                 dev_warn(dev->udev->dev.parent,
1445                          "Cannot setup read URBs, error %d\n", err);
1446                 return err;
1447         } else if (i < MAX_RX_URBS) {
1448                 dev_warn(dev->udev->dev.parent,
1449                          "RX performances may be slow\n");
1450         }
1451
1452         dev->rxinitdone = true;
1453
1454         return 0;
1455 }
1456
1457 static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1458 {
1459         struct kvaser_msg *msg;
1460         int rc;
1461
1462         msg = kzalloc(sizeof(*msg), GFP_KERNEL);
1463         if (!msg)
1464                 return -ENOMEM;
1465
1466         msg->id = CMD_SET_CTRL_MODE;
1467         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_ctrl_mode);
1468         msg->u.ctrl_mode.tid = 0xff;
1469         msg->u.ctrl_mode.channel = priv->channel;
1470
1471         if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1472                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1473         else
1474                 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1475
1476         rc = kvaser_usb_send_msg(priv->dev, msg);
1477
1478         kfree(msg);
1479         return rc;
1480 }
1481
1482 static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv)
1483 {
1484         int err;
1485
1486         init_completion(&priv->start_comp);
1487
1488         err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP,
1489                                          priv->channel);
1490         if (err)
1491                 return err;
1492
1493         if (!wait_for_completion_timeout(&priv->start_comp,
1494                                          msecs_to_jiffies(START_TIMEOUT)))
1495                 return -ETIMEDOUT;
1496
1497         return 0;
1498 }
1499
1500 static int kvaser_usb_open(struct net_device *netdev)
1501 {
1502         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1503         struct kvaser_usb *dev = priv->dev;
1504         int err;
1505
1506         err = open_candev(netdev);
1507         if (err)
1508                 return err;
1509
1510         err = kvaser_usb_setup_rx_urbs(dev);
1511         if (err)
1512                 goto error;
1513
1514         err = kvaser_usb_set_opt_mode(priv);
1515         if (err)
1516                 goto error;
1517
1518         err = kvaser_usb_start_chip(priv);
1519         if (err) {
1520                 netdev_warn(netdev, "Cannot start device, error %d\n", err);
1521                 goto error;
1522         }
1523
1524         priv->can.state = CAN_STATE_ERROR_ACTIVE;
1525
1526         return 0;
1527
1528 error:
1529         close_candev(netdev);
1530         return err;
1531 }
1532
1533 static void kvaser_usb_reset_tx_urb_contexts(struct kvaser_usb_net_priv *priv)
1534 {
1535         int i, max_tx_urbs;
1536
1537         max_tx_urbs = priv->dev->max_tx_urbs;
1538
1539         priv->active_tx_contexts = 0;
1540         for (i = 0; i < max_tx_urbs; i++)
1541                 priv->tx_contexts[i].echo_index = max_tx_urbs;
1542 }
1543
1544 /* This method might sleep. Do not call it in the atomic context
1545  * of URB completions.
1546  */
1547 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
1548 {
1549         usb_kill_anchored_urbs(&priv->tx_submitted);
1550         kvaser_usb_reset_tx_urb_contexts(priv);
1551 }
1552
1553 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
1554 {
1555         int i;
1556
1557         usb_kill_anchored_urbs(&dev->rx_submitted);
1558
1559         for (i = 0; i < MAX_RX_URBS; i++)
1560                 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
1561                                   dev->rxbuf[i],
1562                                   dev->rxbuf_dma[i]);
1563
1564         for (i = 0; i < dev->nchannels; i++) {
1565                 struct kvaser_usb_net_priv *priv = dev->nets[i];
1566
1567                 if (priv)
1568                         kvaser_usb_unlink_tx_urbs(priv);
1569         }
1570 }
1571
1572 static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv)
1573 {
1574         int err;
1575
1576         init_completion(&priv->stop_comp);
1577
1578         err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP,
1579                                          priv->channel);
1580         if (err)
1581                 return err;
1582
1583         if (!wait_for_completion_timeout(&priv->stop_comp,
1584                                          msecs_to_jiffies(STOP_TIMEOUT)))
1585                 return -ETIMEDOUT;
1586
1587         return 0;
1588 }
1589
1590 static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv)
1591 {
1592         struct kvaser_msg *msg;
1593         int rc;
1594
1595         msg = kzalloc(sizeof(*msg), GFP_KERNEL);
1596         if (!msg)
1597                 return -ENOMEM;
1598
1599         msg->id = CMD_FLUSH_QUEUE;
1600         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_flush_queue);
1601         msg->u.flush_queue.channel = priv->channel;
1602         msg->u.flush_queue.flags = 0x00;
1603
1604         rc = kvaser_usb_send_msg(priv->dev, msg);
1605
1606         kfree(msg);
1607         return rc;
1608 }
1609
1610 static int kvaser_usb_close(struct net_device *netdev)
1611 {
1612         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1613         struct kvaser_usb *dev = priv->dev;
1614         int err;
1615
1616         netif_stop_queue(netdev);
1617
1618         err = kvaser_usb_flush_queue(priv);
1619         if (err)
1620                 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
1621
1622         err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel);
1623         if (err)
1624                 netdev_warn(netdev, "Cannot reset card, error %d\n", err);
1625
1626         err = kvaser_usb_stop_chip(priv);
1627         if (err)
1628                 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
1629
1630         /* reset tx contexts */
1631         kvaser_usb_unlink_tx_urbs(priv);
1632
1633         priv->can.state = CAN_STATE_STOPPED;
1634         close_candev(priv->netdev);
1635
1636         return 0;
1637 }
1638
1639 static void kvaser_usb_write_bulk_callback(struct urb *urb)
1640 {
1641         struct kvaser_usb_tx_urb_context *context = urb->context;
1642         struct kvaser_usb_net_priv *priv;
1643         struct net_device *netdev;
1644
1645         if (WARN_ON(!context))
1646                 return;
1647
1648         priv = context->priv;
1649         netdev = priv->netdev;
1650
1651         kfree(urb->transfer_buffer);
1652
1653         if (!netif_device_present(netdev))
1654                 return;
1655
1656         if (urb->status)
1657                 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1658 }
1659
1660 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1661                                          struct net_device *netdev)
1662 {
1663         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1664         struct kvaser_usb *dev = priv->dev;
1665         struct net_device_stats *stats = &netdev->stats;
1666         struct can_frame *cf = (struct can_frame *)skb->data;
1667         struct kvaser_usb_tx_urb_context *context = NULL;
1668         struct urb *urb;
1669         void *buf;
1670         struct kvaser_msg *msg;
1671         int i, err, ret = NETDEV_TX_OK;
1672         u8 *msg_tx_can_flags = NULL;            /* GCC */
1673         unsigned long flags;
1674
1675         if (can_dropped_invalid_skb(netdev, skb))
1676                 return NETDEV_TX_OK;
1677
1678         urb = usb_alloc_urb(0, GFP_ATOMIC);
1679         if (!urb) {
1680                 stats->tx_dropped++;
1681                 dev_kfree_skb(skb);
1682                 return NETDEV_TX_OK;
1683         }
1684
1685         buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1686         if (!buf) {
1687                 stats->tx_dropped++;
1688                 dev_kfree_skb(skb);
1689                 goto freeurb;
1690         }
1691
1692         msg = buf;
1693         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
1694         msg->u.tx_can.channel = priv->channel;
1695
1696         switch (dev->family) {
1697         case KVASER_LEAF:
1698                 msg_tx_can_flags = &msg->u.tx_can.leaf.flags;
1699                 break;
1700         case KVASER_USBCAN:
1701                 msg_tx_can_flags = &msg->u.tx_can.usbcan.flags;
1702                 break;
1703         }
1704
1705         *msg_tx_can_flags = 0;
1706
1707         if (cf->can_id & CAN_EFF_FLAG) {
1708                 msg->id = CMD_TX_EXT_MESSAGE;
1709                 msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
1710                 msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
1711                 msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
1712                 msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
1713                 msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
1714         } else {
1715                 msg->id = CMD_TX_STD_MESSAGE;
1716                 msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
1717                 msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
1718         }
1719
1720         msg->u.tx_can.msg[5] = cf->can_dlc;
1721         memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
1722
1723         if (cf->can_id & CAN_RTR_FLAG)
1724                 *msg_tx_can_flags |= MSG_FLAG_REMOTE_FRAME;
1725
1726         spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1727         for (i = 0; i < dev->max_tx_urbs; i++) {
1728                 if (priv->tx_contexts[i].echo_index == dev->max_tx_urbs) {
1729                         context = &priv->tx_contexts[i];
1730
1731                         context->echo_index = i;
1732                         can_put_echo_skb(skb, netdev, context->echo_index);
1733                         ++priv->active_tx_contexts;
1734                         if (priv->active_tx_contexts >= dev->max_tx_urbs)
1735                                 netif_stop_queue(netdev);
1736
1737                         break;
1738                 }
1739         }
1740         spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1741
1742         /* This should never happen; it implies a flow control bug */
1743         if (!context) {
1744                 netdev_warn(netdev, "cannot find free context\n");
1745
1746                 kfree(buf);
1747                 ret =  NETDEV_TX_BUSY;
1748                 goto freeurb;
1749         }
1750
1751         context->priv = priv;
1752         context->dlc = cf->can_dlc;
1753
1754         msg->u.tx_can.tid = context->echo_index;
1755
1756         usb_fill_bulk_urb(urb, dev->udev,
1757                           usb_sndbulkpipe(dev->udev,
1758                                           dev->bulk_out->bEndpointAddress),
1759                           buf, msg->len,
1760                           kvaser_usb_write_bulk_callback, context);
1761         usb_anchor_urb(urb, &priv->tx_submitted);
1762
1763         err = usb_submit_urb(urb, GFP_ATOMIC);
1764         if (unlikely(err)) {
1765                 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1766
1767                 can_free_echo_skb(netdev, context->echo_index);
1768                 context->echo_index = dev->max_tx_urbs;
1769                 --priv->active_tx_contexts;
1770                 netif_wake_queue(netdev);
1771
1772                 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1773
1774                 usb_unanchor_urb(urb);
1775                 kfree(buf);
1776
1777                 stats->tx_dropped++;
1778
1779                 if (err == -ENODEV)
1780                         netif_device_detach(netdev);
1781                 else
1782                         netdev_warn(netdev, "Failed tx_urb %d\n", err);
1783
1784                 goto freeurb;
1785         }
1786
1787         ret = NETDEV_TX_OK;
1788
1789 freeurb:
1790         usb_free_urb(urb);
1791         return ret;
1792 }
1793
1794 static const struct net_device_ops kvaser_usb_netdev_ops = {
1795         .ndo_open = kvaser_usb_open,
1796         .ndo_stop = kvaser_usb_close,
1797         .ndo_start_xmit = kvaser_usb_start_xmit,
1798         .ndo_change_mtu = can_change_mtu,
1799 };
1800
1801 static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1802         .name = "kvaser_usb",
1803         .tseg1_min = KVASER_USB_TSEG1_MIN,
1804         .tseg1_max = KVASER_USB_TSEG1_MAX,
1805         .tseg2_min = KVASER_USB_TSEG2_MIN,
1806         .tseg2_max = KVASER_USB_TSEG2_MAX,
1807         .sjw_max = KVASER_USB_SJW_MAX,
1808         .brp_min = KVASER_USB_BRP_MIN,
1809         .brp_max = KVASER_USB_BRP_MAX,
1810         .brp_inc = KVASER_USB_BRP_INC,
1811 };
1812
1813 static int kvaser_usb_set_bittiming(struct net_device *netdev)
1814 {
1815         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1816         struct can_bittiming *bt = &priv->can.bittiming;
1817         struct kvaser_usb *dev = priv->dev;
1818         struct kvaser_msg *msg;
1819         int rc;
1820
1821         msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1822         if (!msg)
1823                 return -ENOMEM;
1824
1825         msg->id = CMD_SET_BUS_PARAMS;
1826         msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1827         msg->u.busparams.channel = priv->channel;
1828         msg->u.busparams.tid = 0xff;
1829         msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1830         msg->u.busparams.sjw = bt->sjw;
1831         msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1832         msg->u.busparams.tseg2 = bt->phase_seg2;
1833
1834         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1835                 msg->u.busparams.no_samp = 3;
1836         else
1837                 msg->u.busparams.no_samp = 1;
1838
1839         rc = kvaser_usb_send_msg(dev, msg);
1840
1841         kfree(msg);
1842         return rc;
1843 }
1844
1845 static int kvaser_usb_set_mode(struct net_device *netdev,
1846                                enum can_mode mode)
1847 {
1848         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1849         int err;
1850
1851         switch (mode) {
1852         case CAN_MODE_START:
1853                 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1854                 if (err)
1855                         return err;
1856                 break;
1857         default:
1858                 return -EOPNOTSUPP;
1859         }
1860
1861         return 0;
1862 }
1863
1864 static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1865                                        struct can_berr_counter *bec)
1866 {
1867         struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1868
1869         *bec = priv->bec;
1870
1871         return 0;
1872 }
1873
1874 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1875 {
1876         int i;
1877
1878         for (i = 0; i < dev->nchannels; i++) {
1879                 if (!dev->nets[i])
1880                         continue;
1881
1882                 unregister_candev(dev->nets[i]->netdev);
1883         }
1884
1885         kvaser_usb_unlink_all_urbs(dev);
1886
1887         for (i = 0; i < dev->nchannels; i++) {
1888                 if (!dev->nets[i])
1889                         continue;
1890
1891                 free_candev(dev->nets[i]->netdev);
1892         }
1893 }
1894
1895 static int kvaser_usb_init_one(struct usb_interface *intf,
1896                                const struct usb_device_id *id, int channel)
1897 {
1898         struct kvaser_usb *dev = usb_get_intfdata(intf);
1899         struct net_device *netdev;
1900         struct kvaser_usb_net_priv *priv;
1901         int err;
1902
1903         err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, channel);
1904         if (err)
1905                 return err;
1906
1907         netdev = alloc_candev(sizeof(*priv) +
1908                               dev->max_tx_urbs * sizeof(*priv->tx_contexts),
1909                               dev->max_tx_urbs);
1910         if (!netdev) {
1911                 dev_err(&intf->dev, "Cannot alloc candev\n");
1912                 return -ENOMEM;
1913         }
1914
1915         priv = netdev_priv(netdev);
1916
1917         init_usb_anchor(&priv->tx_submitted);
1918         init_completion(&priv->start_comp);
1919         init_completion(&priv->stop_comp);
1920
1921         priv->dev = dev;
1922         priv->netdev = netdev;
1923         priv->channel = channel;
1924
1925         spin_lock_init(&priv->tx_contexts_lock);
1926         kvaser_usb_reset_tx_urb_contexts(priv);
1927
1928         priv->can.state = CAN_STATE_STOPPED;
1929         priv->can.clock.freq = CAN_USB_CLOCK;
1930         priv->can.bittiming_const = &kvaser_usb_bittiming_const;
1931         priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
1932         priv->can.do_set_mode = kvaser_usb_set_mode;
1933         if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
1934                 priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
1935         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
1936         if (id->driver_info & KVASER_HAS_SILENT_MODE)
1937                 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1938
1939         netdev->flags |= IFF_ECHO;
1940
1941         netdev->netdev_ops = &kvaser_usb_netdev_ops;
1942
1943         SET_NETDEV_DEV(netdev, &intf->dev);
1944         netdev->dev_id = channel;
1945
1946         dev->nets[channel] = priv;
1947
1948         err = register_candev(netdev);
1949         if (err) {
1950                 dev_err(&intf->dev, "Failed to register can device\n");
1951                 free_candev(netdev);
1952                 dev->nets[channel] = NULL;
1953                 return err;
1954         }
1955
1956         netdev_dbg(netdev, "device registered\n");
1957
1958         return 0;
1959 }
1960
1961 static int kvaser_usb_get_endpoints(const struct usb_interface *intf,
1962                                     struct usb_endpoint_descriptor **in,
1963                                     struct usb_endpoint_descriptor **out)
1964 {
1965         const struct usb_host_interface *iface_desc;
1966         struct usb_endpoint_descriptor *endpoint;
1967         int i;
1968
1969         iface_desc = &intf->altsetting[0];
1970
1971         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1972                 endpoint = &iface_desc->endpoint[i].desc;
1973
1974                 if (!*in && usb_endpoint_is_bulk_in(endpoint))
1975                         *in = endpoint;
1976
1977                 if (!*out && usb_endpoint_is_bulk_out(endpoint))
1978                         *out = endpoint;
1979
1980                 /* use first bulk endpoint for in and out */
1981                 if (*in && *out)
1982                         return 0;
1983         }
1984
1985         return -ENODEV;
1986 }
1987
1988 static int kvaser_usb_probe(struct usb_interface *intf,
1989                             const struct usb_device_id *id)
1990 {
1991         struct kvaser_usb *dev;
1992         int err = -ENOMEM;
1993         int i, retry = 3;
1994
1995         dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
1996         if (!dev)
1997                 return -ENOMEM;
1998
1999         if (kvaser_is_leaf(id)) {
2000                 dev->family = KVASER_LEAF;
2001         } else if (kvaser_is_usbcan(id)) {
2002                 dev->family = KVASER_USBCAN;
2003         } else {
2004                 dev_err(&intf->dev,
2005                         "Product ID (%d) does not belong to any known Kvaser USB family",
2006                         id->idProduct);
2007                 return -ENODEV;
2008         }
2009
2010         err = kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
2011         if (err) {
2012                 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
2013                 return err;
2014         }
2015
2016         dev->udev = interface_to_usbdev(intf);
2017
2018         init_usb_anchor(&dev->rx_submitted);
2019
2020         usb_set_intfdata(intf, dev);
2021
2022         /* On some x86 laptops, plugging a Kvaser device again after
2023          * an unplug makes the firmware always ignore the very first
2024          * command. For such a case, provide some room for retries
2025          * instead of completely exiting the driver.
2026          */
2027         do {
2028                 err = kvaser_usb_get_software_info(dev);
2029         } while (--retry && err == -ETIMEDOUT);
2030
2031         if (err) {
2032                 dev_err(&intf->dev,
2033                         "Cannot get software infos, error %d\n", err);
2034                 return err;
2035         }
2036
2037         dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
2038                 ((dev->fw_version >> 24) & 0xff),
2039                 ((dev->fw_version >> 16) & 0xff),
2040                 (dev->fw_version & 0xffff));
2041
2042         dev_dbg(&intf->dev, "Max oustanding tx = %d URBs\n", dev->max_tx_urbs);
2043
2044         err = kvaser_usb_get_card_info(dev);
2045         if (err) {
2046                 dev_err(&intf->dev,
2047                         "Cannot get card infos, error %d\n", err);
2048                 return err;
2049         }
2050
2051         for (i = 0; i < dev->nchannels; i++) {
2052                 err = kvaser_usb_init_one(intf, id, i);
2053                 if (err) {
2054                         kvaser_usb_remove_interfaces(dev);
2055                         return err;
2056                 }
2057         }
2058
2059         return 0;
2060 }
2061
2062 static void kvaser_usb_disconnect(struct usb_interface *intf)
2063 {
2064         struct kvaser_usb *dev = usb_get_intfdata(intf);
2065
2066         usb_set_intfdata(intf, NULL);
2067
2068         if (!dev)
2069                 return;
2070
2071         kvaser_usb_remove_interfaces(dev);
2072 }
2073
2074 static struct usb_driver kvaser_usb_driver = {
2075         .name = "kvaser_usb",
2076         .probe = kvaser_usb_probe,
2077         .disconnect = kvaser_usb_disconnect,
2078         .id_table = kvaser_usb_table,
2079 };
2080
2081 module_usb_driver(kvaser_usb_driver);
2082
2083 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
2084 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
2085 MODULE_LICENSE("GPL v2");